fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57 #include <linux/iversion.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "sysfs.h"
  67 #include "nfs4idmap.h"
  68 #include "nfs4session.h"
  69 #include "fscache.h"
  70 #include "nfs42.h"
  71
  72 #include "nfs4trace.h"
  73
  74 #ifdef CONFIG_NFS_V4_2
  75 #include "nfs42.h"
  76 #endif /* CONFIG_NFS_V4_2 */
  77
  78 #define NFSDBG_FACILITY         NFSDBG_PROC
  79
  80 #define NFS4_BITMASK_SZ         3
  81
  82 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  83 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  84
  85 /* file attributes which can be mapped to nfs attributes */
  86 #define NFS4_VALID_ATTRS (ATTR_MODE \
  87         | ATTR_UID \
  88         | ATTR_GID \
  89         | ATTR_SIZE \
  90         | ATTR_ATIME \
  91         | ATTR_MTIME \
  92         | ATTR_CTIME \
  93         | ATTR_ATIME_SET \
  94         | ATTR_MTIME_SET)
  95
  96 struct nfs4_opendata;
  97 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  98 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  99 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
 100 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);
 101 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
 102                             struct nfs_fattr *fattr, struct iattr *sattr,
 103                             struct nfs_open_context *ctx, struct nfs4_label *ilabel,
 104                             struct nfs4_label *olabel);
 105 #ifdef CONFIG_NFS_V4_1
 106 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 107                 const struct cred *cred,
 108                 struct nfs4_slot *slot,
 109                 bool is_privileged);
 110 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 111                 const struct cred *);
 112 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 113                 const struct cred *, bool);
 114 #endif
 115 static void nfs4_bitmask_adjust(__u32 *bitmask, struct inode *inode,
 116                 struct nfs_server *server,
 117                 struct nfs4_label *label);
 118
 119 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 120 static inline struct nfs4_label *
 121 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 122         struct iattr *sattr, struct nfs4_label *label)
 123 {
 124         int err;
 125
 126         if (label == NULL)
 127                 return NULL;
 128
 129         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 130                 return NULL;
 131
 132         err = security_dentry_init_security(dentry, sattr->ia_mode,
 133                                 &dentry->d_name, (void **)&label->label, &label->len);
 134         if (err == 0)
 135                 return label;
 136
 137         return NULL;
 138 }
 139 static inline void
 140 nfs4_label_release_security(struct nfs4_label *label)
 141 {
 142         if (label)
 143                 security_release_secctx(label->label, label->len);
 144 }
 145 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 146 {
 147         if (label)
 148                 return server->attr_bitmask;
 149
 150         return server->attr_bitmask_nl;
 151 }
 152 #else
 153 static inline struct nfs4_label *
 154 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 155         struct iattr *sattr, struct nfs4_label *l)
 156 { return NULL; }
 157 static inline void
 158 nfs4_label_release_security(struct nfs4_label *label)
 159 { return; }
 160 static inline u32 *
 161 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 162 { return server->attr_bitmask; }
 163 #endif
 164
 165 /* Prevent leaks of NFSv4 errors into userland */
 166 static int nfs4_map_errors(int err)
 167 {
 168         if (err >= -1000)
 169                 return err;
 170         switch (err) {
 171         case -NFS4ERR_RESOURCE:
 172         case -NFS4ERR_LAYOUTTRYLATER:
 173         case -NFS4ERR_RECALLCONFLICT:
 174                 return -EREMOTEIO;
 175         case -NFS4ERR_WRONGSEC:
 176         case -NFS4ERR_WRONG_CRED:
 177                 return -EPERM;
 178         case -NFS4ERR_BADOWNER:
 179         case -NFS4ERR_BADNAME:
 180                 return -EINVAL;
 181         case -NFS4ERR_SHARE_DENIED:
 182                 return -EACCES;
 183         case -NFS4ERR_MINOR_VERS_MISMATCH:
 184                 return -EPROTONOSUPPORT;
 185         case -NFS4ERR_FILE_OPEN:
 186                 return -EBUSY;
 187         case -NFS4ERR_NOT_SAME:
 188                 return -ENOTSYNC;
 189         default:
 190                 dprintk("%s could not handle NFSv4 error %d\n",
 191                                 __func__, -err);
 192                 break;
 193         }
 194         return -EIO;
 195 }
 196
 197 /*
 198  * This is our standard bitmap for GETATTR requests.
 199  */
 200 const u32 nfs4_fattr_bitmap[3] = {
 201         FATTR4_WORD0_TYPE
 202         | FATTR4_WORD0_CHANGE
 203         | FATTR4_WORD0_SIZE
 204         | FATTR4_WORD0_FSID
 205         | FATTR4_WORD0_FILEID,
 206         FATTR4_WORD1_MODE
 207         | FATTR4_WORD1_NUMLINKS
 208         | FATTR4_WORD1_OWNER
 209         | FATTR4_WORD1_OWNER_GROUP
 210         | FATTR4_WORD1_RAWDEV
 211         | FATTR4_WORD1_SPACE_USED
 212         | FATTR4_WORD1_TIME_ACCESS
 213         | FATTR4_WORD1_TIME_METADATA
 214         | FATTR4_WORD1_TIME_MODIFY
 215         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 217         FATTR4_WORD2_SECURITY_LABEL
 218 #endif
 219 };
 220
 221 static const u32 nfs4_pnfs_open_bitmap[3] = {
 222         FATTR4_WORD0_TYPE
 223         | FATTR4_WORD0_CHANGE
 224         | FATTR4_WORD0_SIZE
 225         | FATTR4_WORD0_FSID
 226         | FATTR4_WORD0_FILEID,
 227         FATTR4_WORD1_MODE
 228         | FATTR4_WORD1_NUMLINKS
 229         | FATTR4_WORD1_OWNER
 230         | FATTR4_WORD1_OWNER_GROUP
 231         | FATTR4_WORD1_RAWDEV
 232         | FATTR4_WORD1_SPACE_USED
 233         | FATTR4_WORD1_TIME_ACCESS
 234         | FATTR4_WORD1_TIME_METADATA
 235         | FATTR4_WORD1_TIME_MODIFY,
 236         FATTR4_WORD2_MDSTHRESHOLD
 237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 238         | FATTR4_WORD2_SECURITY_LABEL
 239 #endif
 240 };
 241
 242 static const u32 nfs4_open_noattr_bitmap[3] = {
 243         FATTR4_WORD0_TYPE
 244         | FATTR4_WORD0_FILEID,
 245 };
 246
 247 const u32 nfs4_statfs_bitmap[3] = {
 248         FATTR4_WORD0_FILES_AVAIL
 249         | FATTR4_WORD0_FILES_FREE
 250         | FATTR4_WORD0_FILES_TOTAL,
 251         FATTR4_WORD1_SPACE_AVAIL
 252         | FATTR4_WORD1_SPACE_FREE
 253         | FATTR4_WORD1_SPACE_TOTAL
 254 };
 255
 256 const u32 nfs4_pathconf_bitmap[3] = {
 257         FATTR4_WORD0_MAXLINK
 258         | FATTR4_WORD0_MAXNAME,
 259         0
 260 };
 261
 262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 263                         | FATTR4_WORD0_MAXREAD
 264                         | FATTR4_WORD0_MAXWRITE
 265                         | FATTR4_WORD0_LEASE_TIME,
 266                         FATTR4_WORD1_TIME_DELTA
 267                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 268                         FATTR4_WORD2_LAYOUT_BLKSIZE
 269                         | FATTR4_WORD2_CLONE_BLKSIZE
 270                         | FATTR4_WORD2_XATTR_SUPPORT
 271 };
 272
 273 const u32 nfs4_fs_locations_bitmap[3] = {
 274         FATTR4_WORD0_CHANGE
 275         | FATTR4_WORD0_SIZE
 276         | FATTR4_WORD0_FSID
 277         | FATTR4_WORD0_FILEID
 278         | FATTR4_WORD0_FS_LOCATIONS,
 279         FATTR4_WORD1_OWNER
 280         | FATTR4_WORD1_OWNER_GROUP
 281         | FATTR4_WORD1_RAWDEV
 282         | FATTR4_WORD1_SPACE_USED
 283         | FATTR4_WORD1_TIME_ACCESS
 284         | FATTR4_WORD1_TIME_METADATA
 285         | FATTR4_WORD1_TIME_MODIFY
 286         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 287 };
 288
 289 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 290                 struct inode *inode)
 291 {
 292         unsigned long cache_validity;
 293
 294         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 295         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 296                 return;
 297
 298         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 299         if (!(cache_validity & NFS_INO_REVAL_FORCED))
 300                 cache_validity &= ~(NFS_INO_INVALID_CHANGE
 301                                 | NFS_INO_INVALID_SIZE);
 302
 303         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 304                 dst[0] &= ~FATTR4_WORD0_SIZE;
 305
 306         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 307                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 308 }
 309
 310 static void nfs4_bitmap_copy_adjust_setattr(__u32 *dst,
 311                 const __u32 *src, struct inode *inode)
 312 {
 313         nfs4_bitmap_copy_adjust(dst, src, inode);
 314 }
 315
 316 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 317                 struct nfs4_readdir_arg *readdir)
 318 {
 319         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 320         __be32 *start, *p;
 321
 322         if (cookie > 2) {
 323                 readdir->cookie = cookie;
 324                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 325                 return;
 326         }
 327
 328         readdir->cookie = 0;
 329         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 330         if (cookie == 2)
 331                 return;
 332
 333         /*
 334          * NFSv4 servers do not return entries for '.' and '..'
 335          * Therefore, we fake these entries here.  We let '.'
 336          * have cookie 0 and '..' have cookie 1.  Note that
 337          * when talking to the server, we always send cookie 0
 338          * instead of 1 or 2.
 339          */
 340         start = p = kmap_atomic(*readdir->pages);
 341
 342         if (cookie == 0) {
 343                 *p++ = xdr_one;                                  /* next */
 344                 *p++ = xdr_zero;                   /* cookie, first word */
 345                 *p++ = xdr_one;                   /* cookie, second word */
 346                 *p++ = xdr_one;                             /* entry len */
 347                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 348                 p++;
 349                 *p++ = xdr_one;                         /* bitmap length */
 350                 *p++ = htonl(attrs);                           /* bitmap */
 351                 *p++ = htonl(12);             /* attribute buffer length */
 352                 *p++ = htonl(NF4DIR);
 353                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 354         }
 355
 356         *p++ = xdr_one;                                  /* next */
 357         *p++ = xdr_zero;                   /* cookie, first word */
 358         *p++ = xdr_two;                   /* cookie, second word */
 359         *p++ = xdr_two;                             /* entry len */
 360         memcpy(p, "..\0\0", 4);                         /* entry */
 361         p++;
 362         *p++ = xdr_one;                         /* bitmap length */
 363         *p++ = htonl(attrs);                           /* bitmap */
 364         *p++ = htonl(12);             /* attribute buffer length */
 365         *p++ = htonl(NF4DIR);
 366         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 367
 368         readdir->pgbase = (char *)p - (char *)start;
 369         readdir->count -= readdir->pgbase;
 370         kunmap_atomic(start);
 371 }
 372
 373 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 374                 nfs4_stateid *stateid,
 375                 const struct cred *cred)
 376 {
 377         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 378
 379         ops->test_and_free_expired(server, stateid, cred);
 380 }
 381
 382 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 383                 nfs4_stateid *stateid,
 384                 const struct cred *cred)
 385 {
 386         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 387         nfs4_test_and_free_stateid(server, stateid, cred);
 388 }
 389
 390 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 391                 const nfs4_stateid *stateid,
 392                 const struct cred *cred)
 393 {
 394         nfs4_stateid tmp;
 395
 396         nfs4_stateid_copy(&tmp, stateid);
 397         __nfs4_free_revoked_stateid(server, &tmp, cred);
 398 }
 399
 400 static long nfs4_update_delay(long *timeout)
 401 {
 402         long ret;
 403         if (!timeout)
 404                 return NFS4_POLL_RETRY_MAX;
 405         if (*timeout <= 0)
 406                 *timeout = NFS4_POLL_RETRY_MIN;
 407         if (*timeout > NFS4_POLL_RETRY_MAX)
 408                 *timeout = NFS4_POLL_RETRY_MAX;
 409         ret = *timeout;
 410         *timeout <<= 1;
 411         return ret;
 412 }
 413
 414 static int nfs4_delay_killable(long *timeout)
 415 {
 416         might_sleep();
 417
 418         freezable_schedule_timeout_killable_unsafe(
 419                 nfs4_update_delay(timeout));
 420         if (!__fatal_signal_pending(current))
 421                 return 0;
 422         return -EINTR;
 423 }
 424
 425 static int nfs4_delay_interruptible(long *timeout)
 426 {
 427         might_sleep();
 428
 429         freezable_schedule_timeout_interruptible_unsafe(nfs4_update_delay(timeout));
 430         if (!signal_pending(current))
 431                 return 0;
 432         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 433 }
 434
 435 static int nfs4_delay(long *timeout, bool interruptible)
 436 {
 437         if (interruptible)
 438                 return nfs4_delay_interruptible(timeout);
 439         return nfs4_delay_killable(timeout);
 440 }
 441
 442 static const nfs4_stateid *
 443 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 444 {
 445         if (!stateid)
 446                 return NULL;
 447         switch (stateid->type) {
 448         case NFS4_OPEN_STATEID_TYPE:
 449         case NFS4_LOCK_STATEID_TYPE:
 450         case NFS4_DELEGATION_STATEID_TYPE:
 451                 return stateid;
 452         default:
 453                 break;
 454         }
 455         return NULL;
 456 }
 457
 458 /* This is the error handling routine for processes that are allowed
 459  * to sleep.
 460  */
 461 static int nfs4_do_handle_exception(struct nfs_server *server,
 462                 int errorcode, struct nfs4_exception *exception)
 463 {
 464         struct nfs_client *clp = server->nfs_client;
 465         struct nfs4_state *state = exception->state;
 466         const nfs4_stateid *stateid;
 467         struct inode *inode = exception->inode;
 468         int ret = errorcode;
 469
 470         exception->delay = 0;
 471         exception->recovering = 0;
 472         exception->retry = 0;
 473
 474         stateid = nfs4_recoverable_stateid(exception->stateid);
 475         if (stateid == NULL && state != NULL)
 476                 stateid = nfs4_recoverable_stateid(&state->stateid);
 477
 478         switch(errorcode) {
 479                 case 0:
 480                         return 0;
 481                 case -NFS4ERR_BADHANDLE:
 482                 case -ESTALE:
 483                         if (inode != NULL && S_ISREG(inode->i_mode))
 484                                 pnfs_destroy_layout(NFS_I(inode));
 485                         break;
 486                 case -NFS4ERR_DELEG_REVOKED:
 487                 case -NFS4ERR_ADMIN_REVOKED:
 488                 case -NFS4ERR_EXPIRED:
 489                 case -NFS4ERR_BAD_STATEID:
 490                 case -NFS4ERR_PARTNER_NO_AUTH:
 491                         if (inode != NULL && stateid != NULL) {
 492                                 nfs_inode_find_state_and_recover(inode,
 493                                                 stateid);
 494                                 goto wait_on_recovery;
 495                         }
 496                         fallthrough;
 497                 case -NFS4ERR_OPENMODE:
 498                         if (inode) {
 499                                 int err;
 500
 501                                 err = nfs_async_inode_return_delegation(inode,
 502                                                 stateid);
 503                                 if (err == 0)
 504                                         goto wait_on_recovery;
 505                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 506                                         exception->retry = 1;
 507                                         break;
 508                                 }
 509                         }
 510                         if (state == NULL)
 511                                 break;
 512                         ret = nfs4_schedule_stateid_recovery(server, state);
 513                         if (ret < 0)
 514                                 break;
 515                         goto wait_on_recovery;
 516                 case -NFS4ERR_STALE_STATEID:
 517                 case -NFS4ERR_STALE_CLIENTID:
 518                         nfs4_schedule_lease_recovery(clp);
 519                         goto wait_on_recovery;
 520                 case -NFS4ERR_MOVED:
 521                         ret = nfs4_schedule_migration_recovery(server);
 522                         if (ret < 0)
 523                                 break;
 524                         goto wait_on_recovery;
 525                 case -NFS4ERR_LEASE_MOVED:
 526                         nfs4_schedule_lease_moved_recovery(clp);
 527                         goto wait_on_recovery;
 528 #if defined(CONFIG_NFS_V4_1)
 529                 case -NFS4ERR_BADSESSION:
 530                 case -NFS4ERR_BADSLOT:
 531                 case -NFS4ERR_BAD_HIGH_SLOT:
 532                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 533                 case -NFS4ERR_DEADSESSION:
 534                 case -NFS4ERR_SEQ_FALSE_RETRY:
 535                 case -NFS4ERR_SEQ_MISORDERED:
 536                         /* Handled in nfs41_sequence_process() */
 537                         goto wait_on_recovery;
 538 #endif /* defined(CONFIG_NFS_V4_1) */
 539                 case -NFS4ERR_FILE_OPEN:
 540                         if (exception->timeout > HZ) {
 541                                 /* We have retried a decent amount, time to
 542                                  * fail
 543                                  */
 544                                 ret = -EBUSY;
 545                                 break;
 546                         }
 547                         fallthrough;
 548                 case -NFS4ERR_DELAY:
 549                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 550                         fallthrough;
 551                 case -NFS4ERR_GRACE:
 552                 case -NFS4ERR_LAYOUTTRYLATER:
 553                 case -NFS4ERR_RECALLCONFLICT:
 554                         exception->delay = 1;
 555                         return 0;
 556
 557                 case -NFS4ERR_RETRY_UNCACHED_REP:
 558                 case -NFS4ERR_OLD_STATEID:
 559                         exception->retry = 1;
 560                         break;
 561                 case -NFS4ERR_BADOWNER:
 562                         /* The following works around a Linux server bug! */
 563                 case -NFS4ERR_BADNAME:
 564                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 565                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 566                                 exception->retry = 1;
 567                                 printk(KERN_WARNING "NFS: v4 server %s "
 568                                                 "does not accept raw "
 569                                                 "uid/gids. "
 570                                                 "Reenabling the idmapper.\n",
 571                                                 server->nfs_client->cl_hostname);
 572                         }
 573         }
 574         /* We failed to handle the error */
 575         return nfs4_map_errors(ret);
 576 wait_on_recovery:
 577         exception->recovering = 1;
 578         return 0;
 579 }
 580
 581 /* This is the error handling routine for processes that are allowed
 582  * to sleep.
 583  */
 584 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 585 {
 586         struct nfs_client *clp = server->nfs_client;
 587         int ret;
 588
 589         ret = nfs4_do_handle_exception(server, errorcode, exception);
 590         if (exception->delay) {
 591                 ret = nfs4_delay(&exception->timeout,
 592                                 exception->interruptible);
 593                 goto out_retry;
 594         }
 595         if (exception->recovering) {
 596                 ret = nfs4_wait_clnt_recover(clp);
 597                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 598                         return -EIO;
 599                 goto out_retry;
 600         }
 601         return ret;
 602 out_retry:
 603         if (ret == 0)
 604                 exception->retry = 1;
 605         return ret;
 606 }
 607
 608 static int
 609 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 610                 int errorcode, struct nfs4_exception *exception)
 611 {
 612         struct nfs_client *clp = server->nfs_client;
 613         int ret;
 614
 615         ret = nfs4_do_handle_exception(server, errorcode, exception);
 616         if (exception->delay) {
 617                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 618                 goto out_retry;
 619         }
 620         if (exception->recovering) {
 621                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 622                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 623                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 624                 goto out_retry;
 625         }
 626         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 627                 ret = -EIO;
 628         return ret;
 629 out_retry:
 630         if (ret == 0) {
 631                 exception->retry = 1;
 632                 /*
 633                  * For NFS4ERR_MOVED, the client transport will need to
 634                  * be recomputed after migration recovery has completed.
 635                  */
 636                 if (errorcode == -NFS4ERR_MOVED)
 637                         rpc_task_release_transport(task);
 638         }
 639         return ret;
 640 }
 641
 642 int
 643 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 644                         struct nfs4_state *state, long *timeout)
 645 {
 646         struct nfs4_exception exception = {
 647                 .state = state,
 648         };
 649
 650         if (task->tk_status >= 0)
 651                 return 0;
 652         if (timeout)
 653                 exception.timeout = *timeout;
 654         task->tk_status = nfs4_async_handle_exception(task, server,
 655                         task->tk_status,
 656                         &exception);
 657         if (exception.delay && timeout)
 658                 *timeout = exception.timeout;
 659         if (exception.retry)
 660                 return -EAGAIN;
 661         return 0;
 662 }
 663
 664 /*
 665  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 666  * or 'false' otherwise.
 667  */
 668 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 669 {
 670         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 671         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 672 }
 673
 674 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 675 {
 676         spin_lock(&clp->cl_lock);
 677         if (time_before(clp->cl_last_renewal,timestamp))
 678                 clp->cl_last_renewal = timestamp;
 679         spin_unlock(&clp->cl_lock);
 680 }
 681
 682 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 683 {
 684         struct nfs_client *clp = server->nfs_client;
 685
 686         if (!nfs4_has_session(clp))
 687                 do_renew_lease(clp, timestamp);
 688 }
 689
 690 struct nfs4_call_sync_data {
 691         const struct nfs_server *seq_server;
 692         struct nfs4_sequence_args *seq_args;
 693         struct nfs4_sequence_res *seq_res;
 694 };
 695
 696 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 697                         struct nfs4_sequence_res *res, int cache_reply,
 698                         int privileged)
 699 {
 700         args->sa_slot = NULL;
 701         args->sa_cache_this = cache_reply;
 702         args->sa_privileged = privileged;
 703
 704         res->sr_slot = NULL;
 705 }
 706
 707 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 708 {
 709         struct nfs4_slot *slot = res->sr_slot;
 710         struct nfs4_slot_table *tbl;
 711
 712         tbl = slot->table;
 713         spin_lock(&tbl->slot_tbl_lock);
 714         if (!nfs41_wake_and_assign_slot(tbl, slot))
 715                 nfs4_free_slot(tbl, slot);
 716         spin_unlock(&tbl->slot_tbl_lock);
 717
 718         res->sr_slot = NULL;
 719 }
 720
 721 static int nfs40_sequence_done(struct rpc_task *task,
 722                                struct nfs4_sequence_res *res)
 723 {
 724         if (res->sr_slot != NULL)
 725                 nfs40_sequence_free_slot(res);
 726         return 1;
 727 }
 728
 729 #if defined(CONFIG_NFS_V4_1)
 730
 731 static void nfs41_release_slot(struct nfs4_slot *slot)
 732 {
 733         struct nfs4_session *session;
 734         struct nfs4_slot_table *tbl;
 735         bool send_new_highest_used_slotid = false;
 736
 737         if (!slot)
 738                 return;
 739         tbl = slot->table;
 740         session = tbl->session;
 741
 742         /* Bump the slot sequence number */
 743         if (slot->seq_done)
 744                 slot->seq_nr++;
 745         slot->seq_done = 0;
 746
 747         spin_lock(&tbl->slot_tbl_lock);
 748         /* Be nice to the server: try to ensure that the last transmitted
 749          * value for highest_user_slotid <= target_highest_slotid
 750          */
 751         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 752                 send_new_highest_used_slotid = true;
 753
 754         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 755                 send_new_highest_used_slotid = false;
 756                 goto out_unlock;
 757         }
 758         nfs4_free_slot(tbl, slot);
 759
 760         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 761                 send_new_highest_used_slotid = false;
 762 out_unlock:
 763         spin_unlock(&tbl->slot_tbl_lock);
 764         if (send_new_highest_used_slotid)
 765                 nfs41_notify_server(session->clp);
 766         if (waitqueue_active(&tbl->slot_waitq))
 767                 wake_up_all(&tbl->slot_waitq);
 768 }
 769
 770 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 771 {
 772         nfs41_release_slot(res->sr_slot);
 773         res->sr_slot = NULL;
 774 }
 775
 776 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 777                 u32 seqnr)
 778 {
 779         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 780                 slot->seq_nr_highest_sent = seqnr;
 781 }
 782 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot,
 783                 u32 seqnr)
 784 {
 785         slot->seq_nr_highest_sent = seqnr;
 786         slot->seq_nr_last_acked = seqnr;
 787 }
 788
 789 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 790                                 struct nfs4_slot *slot)
 791 {
 792         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 793         if (!IS_ERR(task))
 794                 rpc_put_task_async(task);
 795 }
 796
 797 static int nfs41_sequence_process(struct rpc_task *task,
 798                 struct nfs4_sequence_res *res)
 799 {
 800         struct nfs4_session *session;
 801         struct nfs4_slot *slot = res->sr_slot;
 802         struct nfs_client *clp;
 803         int status;
 804         int ret = 1;
 805
 806         if (slot == NULL)
 807                 goto out_noaction;
 808         /* don't increment the sequence number if the task wasn't sent */
 809         if (!RPC_WAS_SENT(task) || slot->seq_done)
 810                 goto out;
 811
 812         session = slot->table->session;
 813         clp = session->clp;
 814
 815         trace_nfs4_sequence_done(session, res);
 816
 817         status = res->sr_status;
 818         if (task->tk_status == -NFS4ERR_DEADSESSION)
 819                 status = -NFS4ERR_DEADSESSION;
 820
 821         /* Check the SEQUENCE operation status */
 822         switch (status) {
 823         case 0:
 824                 /* Mark this sequence number as having been acked */
 825                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 826                 /* Update the slot's sequence and clientid lease timer */
 827                 slot->seq_done = 1;
 828                 do_renew_lease(clp, res->sr_timestamp);
 829                 /* Check sequence flags */
 830                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 831                                 !!slot->privileged);
 832                 nfs41_update_target_slotid(slot->table, slot, res);
 833                 break;
 834         case 1:
 835                 /*
 836                  * sr_status remains 1 if an RPC level error occurred.
 837                  * The server may or may not have processed the sequence
 838                  * operation..
 839                  */
 840                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 841                 slot->seq_done = 1;
 842                 goto out;
 843         case -NFS4ERR_DELAY:
 844                 /* The server detected a resend of the RPC call and
 845                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 846                  * of RFC5661.
 847                  */
 848                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 849                         __func__,
 850                         slot->slot_nr,
 851                         slot->seq_nr);
 852                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 853                 goto out_retry;
 854         case -NFS4ERR_RETRY_UNCACHED_REP:
 855         case -NFS4ERR_SEQ_FALSE_RETRY:
 856                 /*
 857                  * The server thinks we tried to replay a request.
 858                  * Retry the call after bumping the sequence ID.
 859                  */
 860                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 861                 goto retry_new_seq;
 862         case -NFS4ERR_BADSLOT:
 863                 /*
 864                  * The slot id we used was probably retired. Try again
 865                  * using a different slot id.
 866                  */
 867                 if (slot->slot_nr < slot->table->target_highest_slotid)
 868                         goto session_recover;
 869                 goto retry_nowait;
 870         case -NFS4ERR_SEQ_MISORDERED:
 871                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 872                 /*
 873                  * Were one or more calls using this slot interrupted?
 874                  * If the server never received the request, then our
 875                  * transmitted slot sequence number may be too high. However,
 876                  * if the server did receive the request then it might
 877                  * accidentally give us a reply with a mismatched operation.
 878                  * We can sort this out by sending a lone sequence operation
 879                  * to the server on the same slot.
 880                  */
 881                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 882                         slot->seq_nr--;
 883                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 884                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 885                                 res->sr_slot = NULL;
 886                         }
 887                         goto retry_nowait;
 888                 }
 889                 /*
 890                  * RFC5661:
 891                  * A retry might be sent while the original request is
 892                  * still in progress on the replier. The replier SHOULD
 893                  * deal with the issue by returning NFS4ERR_DELAY as the
 894                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 895                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 896                  *
 897                  * Restart the search after a delay.
 898                  */
 899                 slot->seq_nr = slot->seq_nr_highest_sent;
 900                 goto out_retry;
 901         case -NFS4ERR_BADSESSION:
 902         case -NFS4ERR_DEADSESSION:
 903         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 904                 goto session_recover;
 905         default:
 906                 /* Just update the slot sequence no. */
 907                 slot->seq_done = 1;
 908         }
 909 out:
 910         /* The session may be reset by one of the error handlers. */
 911         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 912 out_noaction:
 913         return ret;
 914 session_recover:
 915         nfs4_schedule_session_recovery(session, status);
 916         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 917         nfs41_sequence_free_slot(res);
 918         goto out;
 919 retry_new_seq:
 920         ++slot->seq_nr;
 921 retry_nowait:
 922         if (rpc_restart_call_prepare(task)) {
 923                 nfs41_sequence_free_slot(res);
 924                 task->tk_status = 0;
 925                 ret = 0;
 926         }
 927         goto out;
 928 out_retry:
 929         if (!rpc_restart_call(task))
 930                 goto out;
 931         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 932         return 0;
 933 }
 934
 935 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 936 {
 937         if (!nfs41_sequence_process(task, res))
 938                 return 0;
 939         if (res->sr_slot != NULL)
 940                 nfs41_sequence_free_slot(res);
 941         return 1;
 942
 943 }
 944 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 945
 946 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 947 {
 948         if (res->sr_slot == NULL)
 949                 return 1;
 950         if (res->sr_slot->table->session != NULL)
 951                 return nfs41_sequence_process(task, res);
 952         return nfs40_sequence_done(task, res);
 953 }
 954
 955 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 956 {
 957         if (res->sr_slot != NULL) {
 958                 if (res->sr_slot->table->session != NULL)
 959                         nfs41_sequence_free_slot(res);
 960                 else
 961                         nfs40_sequence_free_slot(res);
 962         }
 963 }
 964
 965 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 966 {
 967         if (res->sr_slot == NULL)
 968                 return 1;
 969         if (!res->sr_slot->table->session)
 970                 return nfs40_sequence_done(task, res);
 971         return nfs41_sequence_done(task, res);
 972 }
 973 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 974
 975 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 976 {
 977         struct nfs4_call_sync_data *data = calldata;
 978
 979         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 980
 981         nfs4_setup_sequence(data->seq_server->nfs_client,
 982                             data->seq_args, data->seq_res, task);
 983 }
 984
 985 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 986 {
 987         struct nfs4_call_sync_data *data = calldata;
 988
 989         nfs41_sequence_done(task, data->seq_res);
 990 }
 991
 992 static const struct rpc_call_ops nfs41_call_sync_ops = {
 993         .rpc_call_prepare = nfs41_call_sync_prepare,
 994         .rpc_call_done = nfs41_call_sync_done,
 995 };
 996
 997 #else   /* !CONFIG_NFS_V4_1 */
 998
 999 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1000 {
1001         return nfs40_sequence_done(task, res);
1002 }
1003
1004 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1005 {
1006         if (res->sr_slot != NULL)
1007                 nfs40_sequence_free_slot(res);
1008 }
1009
1010 int nfs4_sequence_done(struct rpc_task *task,
1011                        struct nfs4_sequence_res *res)
1012 {
1013         return nfs40_sequence_done(task, res);
1014 }
1015 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1016
1017 #endif  /* !CONFIG_NFS_V4_1 */
1018
1019 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1020 {
1021         res->sr_timestamp = jiffies;
1022         res->sr_status_flags = 0;
1023         res->sr_status = 1;
1024 }
1025
1026 static
1027 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1028                 struct nfs4_sequence_res *res,
1029                 struct nfs4_slot *slot)
1030 {
1031         if (!slot)
1032                 return;
1033         slot->privileged = args->sa_privileged ? 1 : 0;
1034         args->sa_slot = slot;
1035
1036         res->sr_slot = slot;
1037 }
1038
1039 int nfs4_setup_sequence(struct nfs_client *client,
1040                         struct nfs4_sequence_args *args,
1041                         struct nfs4_sequence_res *res,
1042                         struct rpc_task *task)
1043 {
1044         struct nfs4_session *session = nfs4_get_session(client);
1045         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1046         struct nfs4_slot *slot;
1047
1048         /* slot already allocated? */
1049         if (res->sr_slot != NULL)
1050                 goto out_start;
1051
1052         if (session)
1053                 tbl = &session->fc_slot_table;
1054
1055         spin_lock(&tbl->slot_tbl_lock);
1056         /* The state manager will wait until the slot table is empty */
1057         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1058                 goto out_sleep;
1059
1060         slot = nfs4_alloc_slot(tbl);
1061         if (IS_ERR(slot)) {
1062                 if (slot == ERR_PTR(-ENOMEM))
1063                         goto out_sleep_timeout;
1064                 goto out_sleep;
1065         }
1066         spin_unlock(&tbl->slot_tbl_lock);
1067
1068         nfs4_sequence_attach_slot(args, res, slot);
1069
1070         trace_nfs4_setup_sequence(session, args);
1071 out_start:
1072         nfs41_sequence_res_init(res);
1073         rpc_call_start(task);
1074         return 0;
1075 out_sleep_timeout:
1076         /* Try again in 1/4 second */
1077         if (args->sa_privileged)
1078                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1079                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1080         else
1081                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1082                                 NULL, jiffies + (HZ >> 2));
1083         spin_unlock(&tbl->slot_tbl_lock);
1084         return -EAGAIN;
1085 out_sleep:
1086         if (args->sa_privileged)
1087                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1088                                 RPC_PRIORITY_PRIVILEGED);
1089         else
1090                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1091         spin_unlock(&tbl->slot_tbl_lock);
1092         return -EAGAIN;
1093 }
1094 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1095
1096 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1097 {
1098         struct nfs4_call_sync_data *data = calldata;
1099         nfs4_setup_sequence(data->seq_server->nfs_client,
1100                                 data->seq_args, data->seq_res, task);
1101 }
1102
1103 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1104 {
1105         struct nfs4_call_sync_data *data = calldata;
1106         nfs4_sequence_done(task, data->seq_res);
1107 }
1108
1109 static const struct rpc_call_ops nfs40_call_sync_ops = {
1110         .rpc_call_prepare = nfs40_call_sync_prepare,
1111         .rpc_call_done = nfs40_call_sync_done,
1112 };
1113
1114 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1115 {
1116         int ret;
1117         struct rpc_task *task;
1118
1119         task = rpc_run_task(task_setup);
1120         if (IS_ERR(task))
1121                 return PTR_ERR(task);
1122
1123         ret = task->tk_status;
1124         rpc_put_task(task);
1125         return ret;
1126 }
1127
1128 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1129                              struct nfs_server *server,
1130                              struct rpc_message *msg,
1131                              struct nfs4_sequence_args *args,
1132                              struct nfs4_sequence_res *res,
1133                              unsigned short task_flags)
1134 {
1135         struct nfs_client *clp = server->nfs_client;
1136         struct nfs4_call_sync_data data = {
1137                 .seq_server = server,
1138                 .seq_args = args,
1139                 .seq_res = res,
1140         };
1141         struct rpc_task_setup task_setup = {
1142                 .rpc_client = clnt,
1143                 .rpc_message = msg,
1144                 .callback_ops = clp->cl_mvops->call_sync_ops,
1145                 .callback_data = &data,
1146                 .flags = task_flags,
1147         };
1148
1149         return nfs4_call_sync_custom(&task_setup);
1150 }
1151
1152 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1153                                    struct nfs_server *server,
1154                                    struct rpc_message *msg,
1155                                    struct nfs4_sequence_args *args,
1156                                    struct nfs4_sequence_res *res)
1157 {
1158         return nfs4_do_call_sync(clnt, server, msg, args, res, 0);
1159 }
1160
1161
1162 int nfs4_call_sync(struct rpc_clnt *clnt,
1163                    struct nfs_server *server,
1164                    struct rpc_message *msg,
1165                    struct nfs4_sequence_args *args,
1166                    struct nfs4_sequence_res *res,
1167                    int cache_reply)
1168 {
1169         nfs4_init_sequence(args, res, cache_reply, 0);
1170         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1171 }
1172
1173 static void
1174 nfs4_inc_nlink_locked(struct inode *inode)
1175 {
1176         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1177         inc_nlink(inode);
1178 }
1179
1180 static void
1181 nfs4_dec_nlink_locked(struct inode *inode)
1182 {
1183         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1184         drop_nlink(inode);
1185 }
1186
1187 static void
1188 nfs4_update_changeattr_locked(struct inode *inode,
1189                 struct nfs4_change_info *cinfo,
1190                 unsigned long timestamp, unsigned long cache_validity)
1191 {
1192         struct nfs_inode *nfsi = NFS_I(inode);
1193
1194         nfsi->cache_validity |= NFS_INO_INVALID_CTIME
1195                 | NFS_INO_INVALID_MTIME
1196                 | cache_validity;
1197
1198         if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(inode)) {
1199                 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1200                 nfsi->attrtimeo_timestamp = jiffies;
1201         } else {
1202                 if (S_ISDIR(inode->i_mode)) {
1203                         nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1204                         nfs_force_lookup_revalidate(inode);
1205                 } else {
1206                         if (!NFS_PROTO(inode)->have_delegation(inode,
1207                                                                FMODE_READ))
1208                                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1209                 }
1210
1211                 if (cinfo->before != inode_peek_iversion_raw(inode))
1212                         nfsi->cache_validity |= NFS_INO_INVALID_ACCESS |
1213                                                 NFS_INO_INVALID_ACL |
1214                                                 NFS_INO_INVALID_XATTR;
1215         }
1216         inode_set_iversion_raw(inode, cinfo->after);
1217         nfsi->read_cache_jiffies = timestamp;
1218         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1219         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1220
1221         if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1222                 nfs_fscache_invalidate(inode);
1223 }
1224
1225 void
1226 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1227                 unsigned long timestamp, unsigned long cache_validity)
1228 {
1229         spin_lock(&dir->i_lock);
1230         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1231         spin_unlock(&dir->i_lock);
1232 }
1233
1234 struct nfs4_open_createattrs {
1235         struct nfs4_label *label;
1236         struct iattr *sattr;
1237         const __u32 verf[2];
1238 };
1239
1240 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1241                 int err, struct nfs4_exception *exception)
1242 {
1243         if (err != -EINVAL)
1244                 return false;
1245         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1246                 return false;
1247         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1248         exception->retry = 1;
1249         return true;
1250 }
1251
1252 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1253 {
1254          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1255 }
1256
1257 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1258 {
1259         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1260
1261         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1262 }
1263
1264 static u32
1265 nfs4_map_atomic_open_share(struct nfs_server *server,
1266                 fmode_t fmode, int openflags)
1267 {
1268         u32 res = 0;
1269
1270         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1271         case FMODE_READ:
1272                 res = NFS4_SHARE_ACCESS_READ;
1273                 break;
1274         case FMODE_WRITE:
1275                 res = NFS4_SHARE_ACCESS_WRITE;
1276                 break;
1277         case FMODE_READ|FMODE_WRITE:
1278                 res = NFS4_SHARE_ACCESS_BOTH;
1279         }
1280         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1281                 goto out;
1282         /* Want no delegation if we're using O_DIRECT */
1283         if (openflags & O_DIRECT)
1284                 res |= NFS4_SHARE_WANT_NO_DELEG;
1285 out:
1286         return res;
1287 }
1288
1289 static enum open_claim_type4
1290 nfs4_map_atomic_open_claim(struct nfs_server *server,
1291                 enum open_claim_type4 claim)
1292 {
1293         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1294                 return claim;
1295         switch (claim) {
1296         default:
1297                 return claim;
1298         case NFS4_OPEN_CLAIM_FH:
1299                 return NFS4_OPEN_CLAIM_NULL;
1300         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1301                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1302         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1303                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1304         }
1305 }
1306
1307 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1308 {
1309         p->o_res.f_attr = &p->f_attr;
1310         p->o_res.f_label = p->f_label;
1311         p->o_res.seqid = p->o_arg.seqid;
1312         p->c_res.seqid = p->c_arg.seqid;
1313         p->o_res.server = p->o_arg.server;
1314         p->o_res.access_request = p->o_arg.access;
1315         nfs_fattr_init(&p->f_attr);
1316         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1317 }
1318
1319 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1320                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1321                 const struct nfs4_open_createattrs *c,
1322                 enum open_claim_type4 claim,
1323                 gfp_t gfp_mask)
1324 {
1325         struct dentry *parent = dget_parent(dentry);
1326         struct inode *dir = d_inode(parent);
1327         struct nfs_server *server = NFS_SERVER(dir);
1328         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1329         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1330         struct nfs4_opendata *p;
1331
1332         p = kzalloc(sizeof(*p), gfp_mask);
1333         if (p == NULL)
1334                 goto err;
1335
1336         p->f_label = nfs4_label_alloc(server, gfp_mask);
1337         if (IS_ERR(p->f_label))
1338                 goto err_free_p;
1339
1340         p->a_label = nfs4_label_alloc(server, gfp_mask);
1341         if (IS_ERR(p->a_label))
1342                 goto err_free_f;
1343
1344         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1345         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1346         if (IS_ERR(p->o_arg.seqid))
1347                 goto err_free_label;
1348         nfs_sb_active(dentry->d_sb);
1349         p->dentry = dget(dentry);
1350         p->dir = parent;
1351         p->owner = sp;
1352         atomic_inc(&sp->so_count);
1353         p->o_arg.open_flags = flags;
1354         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1355         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1356         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1357                         fmode, flags);
1358         if (flags & O_CREAT) {
1359                 p->o_arg.umask = current_umask();
1360                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1361                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1362                         p->o_arg.u.attrs = &p->attrs;
1363                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1364
1365                         memcpy(p->o_arg.u.verifier.data, c->verf,
1366                                         sizeof(p->o_arg.u.verifier.data));
1367                 }
1368         }
1369         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1370          * will return permission denied for all bits until close */
1371         if (!(flags & O_EXCL)) {
1372                 /* ask server to check for all possible rights as results
1373                  * are cached */
1374                 switch (p->o_arg.claim) {
1375                 default:
1376                         break;
1377                 case NFS4_OPEN_CLAIM_NULL:
1378                 case NFS4_OPEN_CLAIM_FH:
1379                         p->o_arg.access = NFS4_ACCESS_READ |
1380                                 NFS4_ACCESS_MODIFY |
1381                                 NFS4_ACCESS_EXTEND |
1382                                 NFS4_ACCESS_EXECUTE;
1383 #ifdef CONFIG_NFS_V4_2
1384                         if (server->caps & NFS_CAP_XATTR)
1385                                 p->o_arg.access |= NFS4_ACCESS_XAREAD |
1386                                     NFS4_ACCESS_XAWRITE |
1387                                     NFS4_ACCESS_XALIST;
1388 #endif
1389                 }
1390         }
1391         p->o_arg.clientid = server->nfs_client->cl_clientid;
1392         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1393         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1394         p->o_arg.name = &dentry->d_name;
1395         p->o_arg.server = server;
1396         p->o_arg.bitmask = nfs4_bitmask(server, label);
1397         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1398         switch (p->o_arg.claim) {
1399         case NFS4_OPEN_CLAIM_NULL:
1400         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1401         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1402                 p->o_arg.fh = NFS_FH(dir);
1403                 break;
1404         case NFS4_OPEN_CLAIM_PREVIOUS:
1405         case NFS4_OPEN_CLAIM_FH:
1406         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1407         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1408                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1409         }
1410         p->c_arg.fh = &p->o_res.fh;
1411         p->c_arg.stateid = &p->o_res.stateid;
1412         p->c_arg.seqid = p->o_arg.seqid;
1413         nfs4_init_opendata_res(p);
1414         kref_init(&p->kref);
1415         return p;
1416
1417 err_free_label:
1418         nfs4_label_free(p->a_label);
1419 err_free_f:
1420         nfs4_label_free(p->f_label);
1421 err_free_p:
1422         kfree(p);
1423 err:
1424         dput(parent);
1425         return NULL;
1426 }
1427
1428 static void nfs4_opendata_free(struct kref *kref)
1429 {
1430         struct nfs4_opendata *p = container_of(kref,
1431                         struct nfs4_opendata, kref);
1432         struct super_block *sb = p->dentry->d_sb;
1433
1434         nfs4_lgopen_release(p->lgp);
1435         nfs_free_seqid(p->o_arg.seqid);
1436         nfs4_sequence_free_slot(&p->o_res.seq_res);
1437         if (p->state != NULL)
1438                 nfs4_put_open_state(p->state);
1439         nfs4_put_state_owner(p->owner);
1440
1441         nfs4_label_free(p->a_label);
1442         nfs4_label_free(p->f_label);
1443
1444         dput(p->dir);
1445         dput(p->dentry);
1446         nfs_sb_deactive(sb);
1447         nfs_fattr_free_names(&p->f_attr);
1448         kfree(p->f_attr.mdsthreshold);
1449         kfree(p);
1450 }
1451
1452 static void nfs4_opendata_put(struct nfs4_opendata *p)
1453 {
1454         if (p != NULL)
1455                 kref_put(&p->kref, nfs4_opendata_free);
1456 }
1457
1458 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1459                 fmode_t fmode)
1460 {
1461         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1462         case FMODE_READ|FMODE_WRITE:
1463                 return state->n_rdwr != 0;
1464         case FMODE_WRITE:
1465                 return state->n_wronly != 0;
1466         case FMODE_READ:
1467                 return state->n_rdonly != 0;
1468         }
1469         WARN_ON_ONCE(1);
1470         return false;
1471 }
1472
1473 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1474                 int open_mode, enum open_claim_type4 claim)
1475 {
1476         int ret = 0;
1477
1478         if (open_mode & (O_EXCL|O_TRUNC))
1479                 goto out;
1480         switch (claim) {
1481         case NFS4_OPEN_CLAIM_NULL:
1482         case NFS4_OPEN_CLAIM_FH:
1483                 goto out;
1484         default:
1485                 break;
1486         }
1487         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1488                 case FMODE_READ:
1489                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1490                                 && state->n_rdonly != 0;
1491                         break;
1492                 case FMODE_WRITE:
1493                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1494                                 && state->n_wronly != 0;
1495                         break;
1496                 case FMODE_READ|FMODE_WRITE:
1497                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1498                                 && state->n_rdwr != 0;
1499         }
1500 out:
1501         return ret;
1502 }
1503
1504 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1505                 enum open_claim_type4 claim)
1506 {
1507         if (delegation == NULL)
1508                 return 0;
1509         if ((delegation->type & fmode) != fmode)
1510                 return 0;
1511         switch (claim) {
1512         case NFS4_OPEN_CLAIM_NULL:
1513         case NFS4_OPEN_CLAIM_FH:
1514                 break;
1515         case NFS4_OPEN_CLAIM_PREVIOUS:
1516                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1517                         break;
1518                 fallthrough;
1519         default:
1520                 return 0;
1521         }
1522         nfs_mark_delegation_referenced(delegation);
1523         return 1;
1524 }
1525
1526 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1527 {
1528         switch (fmode) {
1529                 case FMODE_WRITE:
1530                         state->n_wronly++;
1531                         break;
1532                 case FMODE_READ:
1533                         state->n_rdonly++;
1534                         break;
1535                 case FMODE_READ|FMODE_WRITE:
1536                         state->n_rdwr++;
1537         }
1538         nfs4_state_set_mode_locked(state, state->state | fmode);
1539 }
1540
1541 #ifdef CONFIG_NFS_V4_1
1542 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1543 {
1544         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1545                 return true;
1546         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1547                 return true;
1548         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1549                 return true;
1550         return false;
1551 }
1552 #endif /* CONFIG_NFS_V4_1 */
1553
1554 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1555 {
1556         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1557                 wake_up_all(&state->waitq);
1558 }
1559
1560 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1561 {
1562         struct nfs_client *clp = state->owner->so_server->nfs_client;
1563         bool need_recover = false;
1564
1565         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1566                 need_recover = true;
1567         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1568                 need_recover = true;
1569         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1570                 need_recover = true;
1571         if (need_recover)
1572                 nfs4_state_mark_reclaim_nograce(clp, state);
1573 }
1574
1575 /*
1576  * Check for whether or not the caller may update the open stateid
1577  * to the value passed in by stateid.
1578  *
1579  * Note: This function relies heavily on the server implementing
1580  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1581  * correctly.
1582  * i.e. The stateid seqids have to be initialised to 1, and
1583  * are then incremented on every state transition.
1584  */
1585 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1586                 const nfs4_stateid *stateid)
1587 {
1588         if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1589                 /* The common case - we're updating to a new sequence number */
1590                 if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1591                         nfs4_stateid_is_next(&state->open_stateid, stateid)) {
1592                         return true;
1593                 }
1594         } else {
1595                 /* This is the first OPEN in this generation */
1596                 if (stateid->seqid == cpu_to_be32(1))
1597                         return true;
1598         }
1599         return false;
1600 }
1601
1602 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1603 {
1604         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1605                 return;
1606         if (state->n_wronly)
1607                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1608         if (state->n_rdonly)
1609                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1610         if (state->n_rdwr)
1611                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1612         set_bit(NFS_OPEN_STATE, &state->flags);
1613 }
1614
1615 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1616                 nfs4_stateid *stateid, fmode_t fmode)
1617 {
1618         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1619         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1620         case FMODE_WRITE:
1621                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1622                 break;
1623         case FMODE_READ:
1624                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1625                 break;
1626         case 0:
1627                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1628                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1629                 clear_bit(NFS_OPEN_STATE, &state->flags);
1630         }
1631         if (stateid == NULL)
1632                 return;
1633         /* Handle OPEN+OPEN_DOWNGRADE races */
1634         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1635             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1636                 nfs_resync_open_stateid_locked(state);
1637                 goto out;
1638         }
1639         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1640                 nfs4_stateid_copy(&state->stateid, stateid);
1641         nfs4_stateid_copy(&state->open_stateid, stateid);
1642         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1643 out:
1644         nfs_state_log_update_open_stateid(state);
1645 }
1646
1647 static void nfs_clear_open_stateid(struct nfs4_state *state,
1648         nfs4_stateid *arg_stateid,
1649         nfs4_stateid *stateid, fmode_t fmode)
1650 {
1651         write_seqlock(&state->seqlock);
1652         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1653         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1654                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1655         write_sequnlock(&state->seqlock);
1656         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1657                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1658 }
1659
1660 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1661                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1662         __must_hold(&state->owner->so_lock)
1663         __must_hold(&state->seqlock)
1664         __must_hold(RCU)
1665
1666 {
1667         DEFINE_WAIT(wait);
1668         int status = 0;
1669         for (;;) {
1670
1671                 if (nfs_stateid_is_sequential(state, stateid))
1672                         break;
1673
1674                 if (status)
1675                         break;
1676                 /* Rely on seqids for serialisation with NFSv4.0 */
1677                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1678                         break;
1679
1680                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1681                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1682                 /*
1683                  * Ensure we process the state changes in the same order
1684                  * in which the server processed them by delaying the
1685                  * update of the stateid until we are in sequence.
1686                  */
1687                 write_sequnlock(&state->seqlock);
1688                 spin_unlock(&state->owner->so_lock);
1689                 rcu_read_unlock();
1690                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1691
1692                 if (!signal_pending(current)) {
1693                         if (schedule_timeout(5*HZ) == 0)
1694                                 status = -EAGAIN;
1695                         else
1696                                 status = 0;
1697                 } else
1698                         status = -EINTR;
1699                 finish_wait(&state->waitq, &wait);
1700                 rcu_read_lock();
1701                 spin_lock(&state->owner->so_lock);
1702                 write_seqlock(&state->seqlock);
1703         }
1704
1705         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1706             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1707                 nfs4_stateid_copy(freeme, &state->open_stateid);
1708                 nfs_test_and_clear_all_open_stateid(state);
1709         }
1710
1711         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1712                 nfs4_stateid_copy(&state->stateid, stateid);
1713         nfs4_stateid_copy(&state->open_stateid, stateid);
1714         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1715         nfs_state_log_update_open_stateid(state);
1716 }
1717
1718 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1719                 const nfs4_stateid *open_stateid,
1720                 fmode_t fmode,
1721                 nfs4_stateid *freeme)
1722 {
1723         /*
1724          * Protect the call to nfs4_state_set_mode_locked and
1725          * serialise the stateid update
1726          */
1727         write_seqlock(&state->seqlock);
1728         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1729         switch (fmode) {
1730         case FMODE_READ:
1731                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1732                 break;
1733         case FMODE_WRITE:
1734                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1735                 break;
1736         case FMODE_READ|FMODE_WRITE:
1737                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1738         }
1739         set_bit(NFS_OPEN_STATE, &state->flags);
1740         write_sequnlock(&state->seqlock);
1741 }
1742
1743 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1744 {
1745         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1746         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1747         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1748         clear_bit(NFS_OPEN_STATE, &state->flags);
1749 }
1750
1751 static void nfs_state_set_delegation(struct nfs4_state *state,
1752                 const nfs4_stateid *deleg_stateid,
1753                 fmode_t fmode)
1754 {
1755         /*
1756          * Protect the call to nfs4_state_set_mode_locked and
1757          * serialise the stateid update
1758          */
1759         write_seqlock(&state->seqlock);
1760         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1761         set_bit(NFS_DELEGATED_STATE, &state->flags);
1762         write_sequnlock(&state->seqlock);
1763 }
1764
1765 static void nfs_state_clear_delegation(struct nfs4_state *state)
1766 {
1767         write_seqlock(&state->seqlock);
1768         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1769         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1770         write_sequnlock(&state->seqlock);
1771 }
1772
1773 int update_open_stateid(struct nfs4_state *state,
1774                 const nfs4_stateid *open_stateid,
1775                 const nfs4_stateid *delegation,
1776                 fmode_t fmode)
1777 {
1778         struct nfs_server *server = NFS_SERVER(state->inode);
1779         struct nfs_client *clp = server->nfs_client;
1780         struct nfs_inode *nfsi = NFS_I(state->inode);
1781         struct nfs_delegation *deleg_cur;
1782         nfs4_stateid freeme = { };
1783         int ret = 0;
1784
1785         fmode &= (FMODE_READ|FMODE_WRITE);
1786
1787         rcu_read_lock();
1788         spin_lock(&state->owner->so_lock);
1789         if (open_stateid != NULL) {
1790                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1791                 ret = 1;
1792         }
1793
1794         deleg_cur = nfs4_get_valid_delegation(state->inode);
1795         if (deleg_cur == NULL)
1796                 goto no_delegation;
1797
1798         spin_lock(&deleg_cur->lock);
1799         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1800            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1801             (deleg_cur->type & fmode) != fmode)
1802                 goto no_delegation_unlock;
1803
1804         if (delegation == NULL)
1805                 delegation = &deleg_cur->stateid;
1806         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1807                 goto no_delegation_unlock;
1808
1809         nfs_mark_delegation_referenced(deleg_cur);
1810         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1811         ret = 1;
1812 no_delegation_unlock:
1813         spin_unlock(&deleg_cur->lock);
1814 no_delegation:
1815         if (ret)
1816                 update_open_stateflags(state, fmode);
1817         spin_unlock(&state->owner->so_lock);
1818         rcu_read_unlock();
1819
1820         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1821                 nfs4_schedule_state_manager(clp);
1822         if (freeme.type != 0)
1823                 nfs4_test_and_free_stateid(server, &freeme,
1824                                 state->owner->so_cred);
1825
1826         return ret;
1827 }
1828
1829 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1830                 const nfs4_stateid *stateid)
1831 {
1832         struct nfs4_state *state = lsp->ls_state;
1833         bool ret = false;
1834
1835         spin_lock(&state->state_lock);
1836         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1837                 goto out_noupdate;
1838         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1839                 goto out_noupdate;
1840         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1841         ret = true;
1842 out_noupdate:
1843         spin_unlock(&state->state_lock);
1844         return ret;
1845 }
1846
1847 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1848 {
1849         struct nfs_delegation *delegation;
1850
1851         fmode &= FMODE_READ|FMODE_WRITE;
1852         rcu_read_lock();
1853         delegation = nfs4_get_valid_delegation(inode);
1854         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1855                 rcu_read_unlock();
1856                 return;
1857         }
1858         rcu_read_unlock();
1859         nfs4_inode_return_delegation(inode);
1860 }
1861
1862 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1863 {
1864         struct nfs4_state *state = opendata->state;
1865         struct nfs_delegation *delegation;
1866         int open_mode = opendata->o_arg.open_flags;
1867         fmode_t fmode = opendata->o_arg.fmode;
1868         enum open_claim_type4 claim = opendata->o_arg.claim;
1869         nfs4_stateid stateid;
1870         int ret = -EAGAIN;
1871
1872         for (;;) {
1873                 spin_lock(&state->owner->so_lock);
1874                 if (can_open_cached(state, fmode, open_mode, claim)) {
1875                         update_open_stateflags(state, fmode);
1876                         spin_unlock(&state->owner->so_lock);
1877                         goto out_return_state;
1878                 }
1879                 spin_unlock(&state->owner->so_lock);
1880                 rcu_read_lock();
1881                 delegation = nfs4_get_valid_delegation(state->inode);
1882                 if (!can_open_delegated(delegation, fmode, claim)) {
1883                         rcu_read_unlock();
1884                         break;
1885                 }
1886                 /* Save the delegation */
1887                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1888                 rcu_read_unlock();
1889                 nfs_release_seqid(opendata->o_arg.seqid);
1890                 if (!opendata->is_recover) {
1891                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1892                         if (ret != 0)
1893                                 goto out;
1894                 }
1895                 ret = -EAGAIN;
1896
1897                 /* Try to update the stateid using the delegation */
1898                 if (update_open_stateid(state, NULL, &stateid, fmode))
1899                         goto out_return_state;
1900         }
1901 out:
1902         return ERR_PTR(ret);
1903 out_return_state:
1904         refcount_inc(&state->count);
1905         return state;
1906 }
1907
1908 static void
1909 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1910 {
1911         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1912         struct nfs_delegation *delegation;
1913         int delegation_flags = 0;
1914
1915         rcu_read_lock();
1916         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1917         if (delegation)
1918                 delegation_flags = delegation->flags;
1919         rcu_read_unlock();
1920         switch (data->o_arg.claim) {
1921         default:
1922                 break;
1923         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1924         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1925                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1926                                    "returning a delegation for "
1927                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1928                                    clp->cl_hostname);
1929                 return;
1930         }
1931         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1932                 nfs_inode_set_delegation(state->inode,
1933                                 data->owner->so_cred,
1934                                 data->o_res.delegation_type,
1935                                 &data->o_res.delegation,
1936                                 data->o_res.pagemod_limit);
1937         else
1938                 nfs_inode_reclaim_delegation(state->inode,
1939                                 data->owner->so_cred,
1940                                 data->o_res.delegation_type,
1941                                 &data->o_res.delegation,
1942                                 data->o_res.pagemod_limit);
1943
1944         if (data->o_res.do_recall)
1945                 nfs_async_inode_return_delegation(state->inode,
1946                                                   &data->o_res.delegation);
1947 }
1948
1949 /*
1950  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1951  * and update the nfs4_state.
1952  */
1953 static struct nfs4_state *
1954 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1955 {
1956         struct inode *inode = data->state->inode;
1957         struct nfs4_state *state = data->state;
1958         int ret;
1959
1960         if (!data->rpc_done) {
1961                 if (data->rpc_status)
1962                         return ERR_PTR(data->rpc_status);
1963                 /* cached opens have already been processed */
1964                 goto update;
1965         }
1966
1967         ret = nfs_refresh_inode(inode, &data->f_attr);
1968         if (ret)
1969                 return ERR_PTR(ret);
1970
1971         if (data->o_res.delegation_type != 0)
1972                 nfs4_opendata_check_deleg(data, state);
1973 update:
1974         if (!update_open_stateid(state, &data->o_res.stateid,
1975                                 NULL, data->o_arg.fmode))
1976                 return ERR_PTR(-EAGAIN);
1977         refcount_inc(&state->count);
1978
1979         return state;
1980 }
1981
1982 static struct inode *
1983 nfs4_opendata_get_inode(struct nfs4_opendata *data)
1984 {
1985         struct inode *inode;
1986
1987         switch (data->o_arg.claim) {
1988         case NFS4_OPEN_CLAIM_NULL:
1989         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1990         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1991                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1992                         return ERR_PTR(-EAGAIN);
1993                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
1994                                 &data->f_attr, data->f_label);
1995                 break;
1996         default:
1997                 inode = d_inode(data->dentry);
1998                 ihold(inode);
1999                 nfs_refresh_inode(inode, &data->f_attr);
2000         }
2001         return inode;
2002 }
2003
2004 static struct nfs4_state *
2005 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2006 {
2007         struct nfs4_state *state;
2008         struct inode *inode;
2009
2010         inode = nfs4_opendata_get_inode(data);
2011         if (IS_ERR(inode))
2012                 return ERR_CAST(inode);
2013         if (data->state != NULL && data->state->inode == inode) {
2014                 state = data->state;
2015                 refcount_inc(&state->count);
2016         } else
2017                 state = nfs4_get_open_state(inode, data->owner);
2018         iput(inode);
2019         if (state == NULL)
2020                 state = ERR_PTR(-ENOMEM);
2021         return state;
2022 }
2023
2024 static struct nfs4_state *
2025 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2026 {
2027         struct nfs4_state *state;
2028
2029         if (!data->rpc_done) {
2030                 state = nfs4_try_open_cached(data);
2031                 trace_nfs4_cached_open(data->state);
2032                 goto out;
2033         }
2034
2035         state = nfs4_opendata_find_nfs4_state(data);
2036         if (IS_ERR(state))
2037                 goto out;
2038
2039         if (data->o_res.delegation_type != 0)
2040                 nfs4_opendata_check_deleg(data, state);
2041         if (!update_open_stateid(state, &data->o_res.stateid,
2042                                 NULL, data->o_arg.fmode)) {
2043                 nfs4_put_open_state(state);
2044                 state = ERR_PTR(-EAGAIN);
2045         }
2046 out:
2047         nfs_release_seqid(data->o_arg.seqid);
2048         return state;
2049 }
2050
2051 static struct nfs4_state *
2052 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2053 {
2054         struct nfs4_state *ret;
2055
2056         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2057                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2058         else
2059                 ret = _nfs4_opendata_to_nfs4_state(data);
2060         nfs4_sequence_free_slot(&data->o_res.seq_res);
2061         return ret;
2062 }
2063
2064 static struct nfs_open_context *
2065 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2066 {
2067         struct nfs_inode *nfsi = NFS_I(state->inode);
2068         struct nfs_open_context *ctx;
2069
2070         rcu_read_lock();
2071         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2072                 if (ctx->state != state)
2073                         continue;
2074                 if ((ctx->mode & mode) != mode)
2075                         continue;
2076                 if (!get_nfs_open_context(ctx))
2077                         continue;
2078                 rcu_read_unlock();
2079                 return ctx;
2080         }
2081         rcu_read_unlock();
2082         return ERR_PTR(-ENOENT);
2083 }
2084
2085 static struct nfs_open_context *
2086 nfs4_state_find_open_context(struct nfs4_state *state)
2087 {
2088         struct nfs_open_context *ctx;
2089
2090         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2091         if (!IS_ERR(ctx))
2092                 return ctx;
2093         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2094         if (!IS_ERR(ctx))
2095                 return ctx;
2096         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2097 }
2098
2099 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2100                 struct nfs4_state *state, enum open_claim_type4 claim)
2101 {
2102         struct nfs4_opendata *opendata;
2103
2104         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2105                         NULL, claim, GFP_NOFS);
2106         if (opendata == NULL)
2107                 return ERR_PTR(-ENOMEM);
2108         opendata->state = state;
2109         refcount_inc(&state->count);
2110         return opendata;
2111 }
2112
2113 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2114                 fmode_t fmode)
2115 {
2116         struct nfs4_state *newstate;
2117         int ret;
2118
2119         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2120                 return 0;
2121         opendata->o_arg.open_flags = 0;
2122         opendata->o_arg.fmode = fmode;
2123         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
2124                         NFS_SB(opendata->dentry->d_sb),
2125                         fmode, 0);
2126         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2127         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2128         nfs4_init_opendata_res(opendata);
2129         ret = _nfs4_recover_proc_open(opendata);
2130         if (ret != 0)
2131                 return ret;
2132         newstate = nfs4_opendata_to_nfs4_state(opendata);
2133         if (IS_ERR(newstate))
2134                 return PTR_ERR(newstate);
2135         if (newstate != opendata->state)
2136                 ret = -ESTALE;
2137         nfs4_close_state(newstate, fmode);
2138         return ret;
2139 }
2140
2141 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2142 {
2143         int ret;
2144
2145         /* memory barrier prior to reading state->n_* */
2146         smp_rmb();
2147         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2148         if (ret != 0)
2149                 return ret;
2150         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2151         if (ret != 0)
2152                 return ret;
2153         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2154         if (ret != 0)
2155                 return ret;
2156         /*
2157          * We may have performed cached opens for all three recoveries.
2158          * Check if we need to update the current stateid.
2159          */
2160         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2161             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2162                 write_seqlock(&state->seqlock);
2163                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2164                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2165                 write_sequnlock(&state->seqlock);
2166         }
2167         return 0;
2168 }
2169
2170 /*
2171  * OPEN_RECLAIM:
2172  *      reclaim state on the server after a reboot.
2173  */
2174 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2175 {
2176         struct nfs_delegation *delegation;
2177         struct nfs4_opendata *opendata;
2178         fmode_t delegation_type = 0;
2179         int status;
2180
2181         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2182                         NFS4_OPEN_CLAIM_PREVIOUS);
2183         if (IS_ERR(opendata))
2184                 return PTR_ERR(opendata);
2185         rcu_read_lock();
2186         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2187         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2188                 delegation_type = delegation->type;
2189         rcu_read_unlock();
2190         opendata->o_arg.u.delegation_type = delegation_type;
2191         status = nfs4_open_recover(opendata, state);
2192         nfs4_opendata_put(opendata);
2193         return status;
2194 }
2195
2196 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2197 {
2198         struct nfs_server *server = NFS_SERVER(state->inode);
2199         struct nfs4_exception exception = { };
2200         int err;
2201         do {
2202                 err = _nfs4_do_open_reclaim(ctx, state);
2203                 trace_nfs4_open_reclaim(ctx, 0, err);
2204                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2205                         continue;
2206                 if (err != -NFS4ERR_DELAY)
2207                         break;
2208                 nfs4_handle_exception(server, err, &exception);
2209         } while (exception.retry);
2210         return err;
2211 }
2212
2213 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2214 {
2215         struct nfs_open_context *ctx;
2216         int ret;
2217
2218         ctx = nfs4_state_find_open_context(state);
2219         if (IS_ERR(ctx))
2220                 return -EAGAIN;
2221         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2222         nfs_state_clear_open_state_flags(state);
2223         ret = nfs4_do_open_reclaim(ctx, state);
2224         put_nfs_open_context(ctx);
2225         return ret;
2226 }
2227
2228 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2229 {
2230         switch (err) {
2231                 default:
2232                         printk(KERN_ERR "NFS: %s: unhandled error "
2233                                         "%d.\n", __func__, err);
2234                 case 0:
2235                 case -ENOENT:
2236                 case -EAGAIN:
2237                 case -ESTALE:
2238                 case -ETIMEDOUT:
2239                         break;
2240                 case -NFS4ERR_BADSESSION:
2241                 case -NFS4ERR_BADSLOT:
2242                 case -NFS4ERR_BAD_HIGH_SLOT:
2243                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2244                 case -NFS4ERR_DEADSESSION:
2245                         return -EAGAIN;
2246                 case -NFS4ERR_STALE_CLIENTID:
2247                 case -NFS4ERR_STALE_STATEID:
2248                         /* Don't recall a delegation if it was lost */
2249                         nfs4_schedule_lease_recovery(server->nfs_client);
2250                         return -EAGAIN;
2251                 case -NFS4ERR_MOVED:
2252                         nfs4_schedule_migration_recovery(server);
2253                         return -EAGAIN;
2254                 case -NFS4ERR_LEASE_MOVED:
2255                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2256                         return -EAGAIN;
2257                 case -NFS4ERR_DELEG_REVOKED:
2258                 case -NFS4ERR_ADMIN_REVOKED:
2259                 case -NFS4ERR_EXPIRED:
2260                 case -NFS4ERR_BAD_STATEID:
2261                 case -NFS4ERR_OPENMODE:
2262                         nfs_inode_find_state_and_recover(state->inode,
2263                                         stateid);
2264                         nfs4_schedule_stateid_recovery(server, state);
2265                         return -EAGAIN;
2266                 case -NFS4ERR_DELAY:
2267                 case -NFS4ERR_GRACE:
2268                         ssleep(1);
2269                         return -EAGAIN;
2270                 case -ENOMEM:
2271                 case -NFS4ERR_DENIED:
2272                         if (fl) {
2273                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2274                                 if (lsp)
2275                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2276                         }
2277                         return 0;
2278         }
2279         return err;
2280 }
2281
2282 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2283                 struct nfs4_state *state, const nfs4_stateid *stateid)
2284 {
2285         struct nfs_server *server = NFS_SERVER(state->inode);
2286         struct nfs4_opendata *opendata;
2287         int err = 0;
2288
2289         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2290                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2291         if (IS_ERR(opendata))
2292                 return PTR_ERR(opendata);
2293         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2294         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2295                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2296                 if (err)
2297                         goto out;
2298         }
2299         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2300                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2301                 if (err)
2302                         goto out;
2303         }
2304         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2305                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2306                 if (err)
2307                         goto out;
2308         }
2309         nfs_state_clear_delegation(state);
2310 out:
2311         nfs4_opendata_put(opendata);
2312         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2313 }
2314
2315 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2316 {
2317         struct nfs4_opendata *data = calldata;
2318
2319         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2320                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2321 }
2322
2323 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2324 {
2325         struct nfs4_opendata *data = calldata;
2326
2327         nfs40_sequence_done(task, &data->c_res.seq_res);
2328
2329         data->rpc_status = task->tk_status;
2330         if (data->rpc_status == 0) {
2331                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2332                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2333                 renew_lease(data->o_res.server, data->timestamp);
2334                 data->rpc_done = true;
2335         }
2336 }
2337
2338 static void nfs4_open_confirm_release(void *calldata)
2339 {
2340         struct nfs4_opendata *data = calldata;
2341         struct nfs4_state *state = NULL;
2342
2343         /* If this request hasn't been cancelled, do nothing */
2344         if (!data->cancelled)
2345                 goto out_free;
2346         /* In case of error, no cleanup! */
2347         if (!data->rpc_done)
2348                 goto out_free;
2349         state = nfs4_opendata_to_nfs4_state(data);
2350         if (!IS_ERR(state))
2351                 nfs4_close_state(state, data->o_arg.fmode);
2352 out_free:
2353         nfs4_opendata_put(data);
2354 }
2355
2356 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2357         .rpc_call_prepare = nfs4_open_confirm_prepare,
2358         .rpc_call_done = nfs4_open_confirm_done,
2359         .rpc_release = nfs4_open_confirm_release,
2360 };
2361
2362 /*
2363  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2364  */
2365 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2366 {
2367         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2368         struct rpc_task *task;
2369         struct  rpc_message msg = {
2370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2371                 .rpc_argp = &data->c_arg,
2372                 .rpc_resp = &data->c_res,
2373                 .rpc_cred = data->owner->so_cred,
2374         };
2375         struct rpc_task_setup task_setup_data = {
2376                 .rpc_client = server->client,
2377                 .rpc_message = &msg,
2378                 .callback_ops = &nfs4_open_confirm_ops,
2379                 .callback_data = data,
2380                 .workqueue = nfsiod_workqueue,
2381                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2382         };
2383         int status;
2384
2385         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2386                                 data->is_recover);
2387         kref_get(&data->kref);
2388         data->rpc_done = false;
2389         data->rpc_status = 0;
2390         data->timestamp = jiffies;
2391         task = rpc_run_task(&task_setup_data);
2392         if (IS_ERR(task))
2393                 return PTR_ERR(task);
2394         status = rpc_wait_for_completion_task(task);
2395         if (status != 0) {
2396                 data->cancelled = true;
2397                 smp_wmb();
2398         } else
2399                 status = data->rpc_status;
2400         rpc_put_task(task);
2401         return status;
2402 }
2403
2404 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2405 {
2406         struct nfs4_opendata *data = calldata;
2407         struct nfs4_state_owner *sp = data->owner;
2408         struct nfs_client *clp = sp->so_server->nfs_client;
2409         enum open_claim_type4 claim = data->o_arg.claim;
2410
2411         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2412                 goto out_wait;
2413         /*
2414          * Check if we still need to send an OPEN call, or if we can use
2415          * a delegation instead.
2416          */
2417         if (data->state != NULL) {
2418                 struct nfs_delegation *delegation;
2419
2420                 if (can_open_cached(data->state, data->o_arg.fmode,
2421                                         data->o_arg.open_flags, claim))
2422                         goto out_no_action;
2423                 rcu_read_lock();
2424                 delegation = nfs4_get_valid_delegation(data->state->inode);
2425                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2426                         goto unlock_no_action;
2427                 rcu_read_unlock();
2428         }
2429         /* Update client id. */
2430         data->o_arg.clientid = clp->cl_clientid;
2431         switch (claim) {
2432         default:
2433                 break;
2434         case NFS4_OPEN_CLAIM_PREVIOUS:
2435         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2436         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2437                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2438                 fallthrough;
2439         case NFS4_OPEN_CLAIM_FH:
2440                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2441         }
2442         data->timestamp = jiffies;
2443         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2444                                 &data->o_arg.seq_args,
2445                                 &data->o_res.seq_res,
2446                                 task) != 0)
2447                 nfs_release_seqid(data->o_arg.seqid);
2448
2449         /* Set the create mode (note dependency on the session type) */
2450         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2451         if (data->o_arg.open_flags & O_EXCL) {
2452                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2453                 if (nfs4_has_persistent_session(clp))
2454                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2455                 else if (clp->cl_mvops->minor_version > 0)
2456                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2457         }
2458         return;
2459 unlock_no_action:
2460         trace_nfs4_cached_open(data->state);
2461         rcu_read_unlock();
2462 out_no_action:
2463         task->tk_action = NULL;
2464 out_wait:
2465         nfs4_sequence_done(task, &data->o_res.seq_res);
2466 }
2467
2468 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2469 {
2470         struct nfs4_opendata *data = calldata;
2471
2472         data->rpc_status = task->tk_status;
2473
2474         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2475                 return;
2476
2477         if (task->tk_status == 0) {
2478                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2479                         switch (data->o_res.f_attr->mode & S_IFMT) {
2480                         case S_IFREG:
2481                                 break;
2482                         case S_IFLNK:
2483                                 data->rpc_status = -ELOOP;
2484                                 break;
2485                         case S_IFDIR:
2486                                 data->rpc_status = -EISDIR;
2487                                 break;
2488                         default:
2489                                 data->rpc_status = -ENOTDIR;
2490                         }
2491                 }
2492                 renew_lease(data->o_res.server, data->timestamp);
2493                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2494                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2495         }
2496         data->rpc_done = true;
2497 }
2498
2499 static void nfs4_open_release(void *calldata)
2500 {
2501         struct nfs4_opendata *data = calldata;
2502         struct nfs4_state *state = NULL;
2503
2504         /* If this request hasn't been cancelled, do nothing */
2505         if (!data->cancelled)
2506                 goto out_free;
2507         /* In case of error, no cleanup! */
2508         if (data->rpc_status != 0 || !data->rpc_done)
2509                 goto out_free;
2510         /* In case we need an open_confirm, no cleanup! */
2511         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2512                 goto out_free;
2513         state = nfs4_opendata_to_nfs4_state(data);
2514         if (!IS_ERR(state))
2515                 nfs4_close_state(state, data->o_arg.fmode);
2516 out_free:
2517         nfs4_opendata_put(data);
2518 }
2519
2520 static const struct rpc_call_ops nfs4_open_ops = {
2521         .rpc_call_prepare = nfs4_open_prepare,
2522         .rpc_call_done = nfs4_open_done,
2523         .rpc_release = nfs4_open_release,
2524 };
2525
2526 static int nfs4_run_open_task(struct nfs4_opendata *data,
2527                               struct nfs_open_context *ctx)
2528 {
2529         struct inode *dir = d_inode(data->dir);
2530         struct nfs_server *server = NFS_SERVER(dir);
2531         struct nfs_openargs *o_arg = &data->o_arg;
2532         struct nfs_openres *o_res = &data->o_res;
2533         struct rpc_task *task;
2534         struct rpc_message msg = {
2535                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2536                 .rpc_argp = o_arg,
2537                 .rpc_resp = o_res,
2538                 .rpc_cred = data->owner->so_cred,
2539         };
2540         struct rpc_task_setup task_setup_data = {
2541                 .rpc_client = server->client,
2542                 .rpc_message = &msg,
2543                 .callback_ops = &nfs4_open_ops,
2544                 .callback_data = data,
2545                 .workqueue = nfsiod_workqueue,
2546                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2547         };
2548         int status;
2549
2550         kref_get(&data->kref);
2551         data->rpc_done = false;
2552         data->rpc_status = 0;
2553         data->cancelled = false;
2554         data->is_recover = false;
2555         if (!ctx) {
2556                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2557                 data->is_recover = true;
2558                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2559         } else {
2560                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2561                 pnfs_lgopen_prepare(data, ctx);
2562         }
2563         task = rpc_run_task(&task_setup_data);
2564         if (IS_ERR(task))
2565                 return PTR_ERR(task);
2566         status = rpc_wait_for_completion_task(task);
2567         if (status != 0) {
2568                 data->cancelled = true;
2569                 smp_wmb();
2570         } else
2571                 status = data->rpc_status;
2572         rpc_put_task(task);
2573
2574         return status;
2575 }
2576
2577 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2578 {
2579         struct inode *dir = d_inode(data->dir);
2580         struct nfs_openres *o_res = &data->o_res;
2581         int status;
2582
2583         status = nfs4_run_open_task(data, NULL);
2584         if (status != 0 || !data->rpc_done)
2585                 return status;
2586
2587         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2588
2589         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2590                 status = _nfs4_proc_open_confirm(data);
2591
2592         return status;
2593 }
2594
2595 /*
2596  * Additional permission checks in order to distinguish between an
2597  * open for read, and an open for execute. This works around the
2598  * fact that NFSv4 OPEN treats read and execute permissions as being
2599  * the same.
2600  * Note that in the non-execute case, we want to turn off permission
2601  * checking if we just created a new file (POSIX open() semantics).
2602  */
2603 static int nfs4_opendata_access(const struct cred *cred,
2604                                 struct nfs4_opendata *opendata,
2605                                 struct nfs4_state *state, fmode_t fmode,
2606                                 int openflags)
2607 {
2608         struct nfs_access_entry cache;
2609         u32 mask, flags;
2610
2611         /* access call failed or for some reason the server doesn't
2612          * support any access modes -- defer access call until later */
2613         if (opendata->o_res.access_supported == 0)
2614                 return 0;
2615
2616         mask = 0;
2617         /*
2618          * Use openflags to check for exec, because fmode won't
2619          * always have FMODE_EXEC set when file open for exec.
2620          */
2621         if (openflags & __FMODE_EXEC) {
2622                 /* ONLY check for exec rights */
2623                 if (S_ISDIR(state->inode->i_mode))
2624                         mask = NFS4_ACCESS_LOOKUP;
2625                 else
2626                         mask = NFS4_ACCESS_EXECUTE;
2627         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2628                 mask = NFS4_ACCESS_READ;
2629
2630         cache.cred = cred;
2631         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2632         nfs_access_add_cache(state->inode, &cache);
2633
2634         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2635         if ((mask & ~cache.mask & flags) == 0)
2636                 return 0;
2637
2638         return -EACCES;
2639 }
2640
2641 /*
2642  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2643  */
2644 static int _nfs4_proc_open(struct nfs4_opendata *data,
2645                            struct nfs_open_context *ctx)
2646 {
2647         struct inode *dir = d_inode(data->dir);
2648         struct nfs_server *server = NFS_SERVER(dir);
2649         struct nfs_openargs *o_arg = &data->o_arg;
2650         struct nfs_openres *o_res = &data->o_res;
2651         int status;
2652
2653         status = nfs4_run_open_task(data, ctx);
2654         if (!data->rpc_done)
2655                 return status;
2656         if (status != 0) {
2657                 if (status == -NFS4ERR_BADNAME &&
2658                                 !(o_arg->open_flags & O_CREAT))
2659                         return -ENOENT;
2660                 return status;
2661         }
2662
2663         nfs_fattr_map_and_free_names(server, &data->f_attr);
2664
2665         if (o_arg->open_flags & O_CREAT) {
2666                 if (o_arg->open_flags & O_EXCL)
2667                         data->file_created = true;
2668                 else if (o_res->cinfo.before != o_res->cinfo.after)
2669                         data->file_created = true;
2670                 if (data->file_created ||
2671                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2672                         nfs4_update_changeattr(dir, &o_res->cinfo,
2673                                         o_res->f_attr->time_start,
2674                                         NFS_INO_INVALID_DATA);
2675         }
2676         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2677                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2678         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2679                 status = _nfs4_proc_open_confirm(data);
2680                 if (status != 0)
2681                         return status;
2682         }
2683         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2684                 nfs4_sequence_free_slot(&o_res->seq_res);
2685                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr,
2686                                 o_res->f_label, NULL);
2687         }
2688         return 0;
2689 }
2690
2691 /*
2692  * OPEN_EXPIRED:
2693  *      reclaim state on the server after a network partition.
2694  *      Assumes caller holds the appropriate lock
2695  */
2696 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2697 {
2698         struct nfs4_opendata *opendata;
2699         int ret;
2700
2701         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2702                         NFS4_OPEN_CLAIM_FH);
2703         if (IS_ERR(opendata))
2704                 return PTR_ERR(opendata);
2705         ret = nfs4_open_recover(opendata, state);
2706         if (ret == -ESTALE)
2707                 d_drop(ctx->dentry);
2708         nfs4_opendata_put(opendata);
2709         return ret;
2710 }
2711
2712 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2713 {
2714         struct nfs_server *server = NFS_SERVER(state->inode);
2715         struct nfs4_exception exception = { };
2716         int err;
2717
2718         do {
2719                 err = _nfs4_open_expired(ctx, state);
2720                 trace_nfs4_open_expired(ctx, 0, err);
2721                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2722                         continue;
2723                 switch (err) {
2724                 default:
2725                         goto out;
2726                 case -NFS4ERR_GRACE:
2727                 case -NFS4ERR_DELAY:
2728                         nfs4_handle_exception(server, err, &exception);
2729                         err = 0;
2730                 }
2731         } while (exception.retry);
2732 out:
2733         return err;
2734 }
2735
2736 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2737 {
2738         struct nfs_open_context *ctx;
2739         int ret;
2740
2741         ctx = nfs4_state_find_open_context(state);
2742         if (IS_ERR(ctx))
2743                 return -EAGAIN;
2744         ret = nfs4_do_open_expired(ctx, state);
2745         put_nfs_open_context(ctx);
2746         return ret;
2747 }
2748
2749 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2750                 const nfs4_stateid *stateid)
2751 {
2752         nfs_remove_bad_delegation(state->inode, stateid);
2753         nfs_state_clear_delegation(state);
2754 }
2755
2756 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2757 {
2758         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2759                 nfs_finish_clear_delegation_stateid(state, NULL);
2760 }
2761
2762 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2763 {
2764         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2765         nfs40_clear_delegation_stateid(state);
2766         nfs_state_clear_open_state_flags(state);
2767         return nfs4_open_expired(sp, state);
2768 }
2769
2770 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2771                 nfs4_stateid *stateid,
2772                 const struct cred *cred)
2773 {
2774         return -NFS4ERR_BAD_STATEID;
2775 }
2776
2777 #if defined(CONFIG_NFS_V4_1)
2778 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2779                 nfs4_stateid *stateid,
2780                 const struct cred *cred)
2781 {
2782         int status;
2783
2784         switch (stateid->type) {
2785         default:
2786                 break;
2787         case NFS4_INVALID_STATEID_TYPE:
2788         case NFS4_SPECIAL_STATEID_TYPE:
2789                 return -NFS4ERR_BAD_STATEID;
2790         case NFS4_REVOKED_STATEID_TYPE:
2791                 goto out_free;
2792         }
2793
2794         status = nfs41_test_stateid(server, stateid, cred);
2795         switch (status) {
2796         case -NFS4ERR_EXPIRED:
2797         case -NFS4ERR_ADMIN_REVOKED:
2798         case -NFS4ERR_DELEG_REVOKED:
2799                 break;
2800         default:
2801                 return status;
2802         }
2803 out_free:
2804         /* Ack the revoked state to the server */
2805         nfs41_free_stateid(server, stateid, cred, true);
2806         return -NFS4ERR_EXPIRED;
2807 }
2808
2809 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2810 {
2811         struct nfs_server *server = NFS_SERVER(state->inode);
2812         nfs4_stateid stateid;
2813         struct nfs_delegation *delegation;
2814         const struct cred *cred = NULL;
2815         int status, ret = NFS_OK;
2816
2817         /* Get the delegation credential for use by test/free_stateid */
2818         rcu_read_lock();
2819         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2820         if (delegation == NULL) {
2821                 rcu_read_unlock();
2822                 nfs_state_clear_delegation(state);
2823                 return NFS_OK;
2824         }
2825
2826         spin_lock(&delegation->lock);
2827         nfs4_stateid_copy(&stateid, &delegation->stateid);
2828
2829         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2830                                 &delegation->flags)) {
2831                 spin_unlock(&delegation->lock);
2832                 rcu_read_unlock();
2833                 return NFS_OK;
2834         }
2835
2836         if (delegation->cred)
2837                 cred = get_cred(delegation->cred);
2838         spin_unlock(&delegation->lock);
2839         rcu_read_unlock();
2840         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2841         trace_nfs4_test_delegation_stateid(state, NULL, status);
2842         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2843                 nfs_finish_clear_delegation_stateid(state, &stateid);
2844         else
2845                 ret = status;
2846
2847         put_cred(cred);
2848         return ret;
2849 }
2850
2851 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2852 {
2853         nfs4_stateid tmp;
2854
2855         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2856             nfs4_copy_delegation_stateid(state->inode, state->state,
2857                                 &tmp, NULL) &&
2858             nfs4_stateid_match_other(&state->stateid, &tmp))
2859                 nfs_state_set_delegation(state, &tmp, state->state);
2860         else
2861                 nfs_state_clear_delegation(state);
2862 }
2863
2864 /**
2865  * nfs41_check_expired_locks - possibly free a lock stateid
2866  *
2867  * @state: NFSv4 state for an inode
2868  *
2869  * Returns NFS_OK if recovery for this stateid is now finished.
2870  * Otherwise a negative NFS4ERR value is returned.
2871  */
2872 static int nfs41_check_expired_locks(struct nfs4_state *state)
2873 {
2874         int status, ret = NFS_OK;
2875         struct nfs4_lock_state *lsp, *prev = NULL;
2876         struct nfs_server *server = NFS_SERVER(state->inode);
2877
2878         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2879                 goto out;
2880
2881         spin_lock(&state->state_lock);
2882         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2883                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2884                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2885
2886                         refcount_inc(&lsp->ls_count);
2887                         spin_unlock(&state->state_lock);
2888
2889                         nfs4_put_lock_state(prev);
2890                         prev = lsp;
2891
2892                         status = nfs41_test_and_free_expired_stateid(server,
2893                                         &lsp->ls_stateid,
2894                                         cred);
2895                         trace_nfs4_test_lock_stateid(state, lsp, status);
2896                         if (status == -NFS4ERR_EXPIRED ||
2897                             status == -NFS4ERR_BAD_STATEID) {
2898                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2899                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2900                                 if (!recover_lost_locks)
2901                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2902                         } else if (status != NFS_OK) {
2903                                 ret = status;
2904                                 nfs4_put_lock_state(prev);
2905                                 goto out;
2906                         }
2907                         spin_lock(&state->state_lock);
2908                 }
2909         }
2910         spin_unlock(&state->state_lock);
2911         nfs4_put_lock_state(prev);
2912 out:
2913         return ret;
2914 }
2915
2916 /**
2917  * nfs41_check_open_stateid - possibly free an open stateid
2918  *
2919  * @state: NFSv4 state for an inode
2920  *
2921  * Returns NFS_OK if recovery for this stateid is now finished.
2922  * Otherwise a negative NFS4ERR value is returned.
2923  */
2924 static int nfs41_check_open_stateid(struct nfs4_state *state)
2925 {
2926         struct nfs_server *server = NFS_SERVER(state->inode);
2927         nfs4_stateid *stateid = &state->open_stateid;
2928         const struct cred *cred = state->owner->so_cred;
2929         int status;
2930
2931         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2932                 return -NFS4ERR_BAD_STATEID;
2933         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2934         trace_nfs4_test_open_stateid(state, NULL, status);
2935         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2936                 nfs_state_clear_open_state_flags(state);
2937                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2938                 return status;
2939         }
2940         if (nfs_open_stateid_recover_openmode(state))
2941                 return -NFS4ERR_OPENMODE;
2942         return NFS_OK;
2943 }
2944
2945 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2946 {
2947         int status;
2948
2949         status = nfs41_check_delegation_stateid(state);
2950         if (status != NFS_OK)
2951                 return status;
2952         nfs41_delegation_recover_stateid(state);
2953
2954         status = nfs41_check_expired_locks(state);
2955         if (status != NFS_OK)
2956                 return status;
2957         status = nfs41_check_open_stateid(state);
2958         if (status != NFS_OK)
2959                 status = nfs4_open_expired(sp, state);
2960         return status;
2961 }
2962 #endif
2963
2964 /*
2965  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2966  * fields corresponding to attributes that were used to store the verifier.
2967  * Make sure we clobber those fields in the later setattr call
2968  */
2969 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2970                                 struct iattr *sattr, struct nfs4_label **label)
2971 {
2972         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2973         __u32 attrset[3];
2974         unsigned ret;
2975         unsigned i;
2976
2977         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
2978                 attrset[i] = opendata->o_res.attrset[i];
2979                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
2980                         attrset[i] &= ~bitmask[i];
2981         }
2982
2983         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
2984                 sattr->ia_valid : 0;
2985
2986         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
2987                 if (sattr->ia_valid & ATTR_ATIME_SET)
2988                         ret |= ATTR_ATIME_SET;
2989                 else
2990                         ret |= ATTR_ATIME;
2991         }
2992
2993         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
2994                 if (sattr->ia_valid & ATTR_MTIME_SET)
2995                         ret |= ATTR_MTIME_SET;
2996                 else
2997                         ret |= ATTR_MTIME;
2998         }
2999
3000         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3001                 *label = NULL;
3002         return ret;
3003 }
3004
3005 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3006                 int flags, struct nfs_open_context *ctx)
3007 {
3008         struct nfs4_state_owner *sp = opendata->owner;
3009         struct nfs_server *server = sp->so_server;
3010         struct dentry *dentry;
3011         struct nfs4_state *state;
3012         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3013         struct inode *dir = d_inode(opendata->dir);
3014         unsigned long dir_verifier;
3015         unsigned int seq;
3016         int ret;
3017
3018         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3019         dir_verifier = nfs_save_change_attribute(dir);
3020
3021         ret = _nfs4_proc_open(opendata, ctx);
3022         if (ret != 0)
3023                 goto out;
3024
3025         state = _nfs4_opendata_to_nfs4_state(opendata);
3026         ret = PTR_ERR(state);
3027         if (IS_ERR(state))
3028                 goto out;
3029         ctx->state = state;
3030         if (server->caps & NFS_CAP_POSIX_LOCK)
3031                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3032         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3033                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3034
3035         dentry = opendata->dentry;
3036         if (d_really_is_negative(dentry)) {
3037                 struct dentry *alias;
3038                 d_drop(dentry);
3039                 alias = d_exact_alias(dentry, state->inode);
3040                 if (!alias)
3041                         alias = d_splice_alias(igrab(state->inode), dentry);
3042                 /* d_splice_alias() can't fail here - it's a non-directory */
3043                 if (alias) {
3044                         dput(ctx->dentry);
3045                         ctx->dentry = dentry = alias;
3046                 }
3047         }
3048
3049         switch(opendata->o_arg.claim) {
3050         default:
3051                 break;
3052         case NFS4_OPEN_CLAIM_NULL:
3053         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3054         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3055                 if (!opendata->rpc_done)
3056                         break;
3057                 if (opendata->o_res.delegation_type != 0)
3058                         dir_verifier = nfs_save_change_attribute(dir);
3059                 nfs_set_verifier(dentry, dir_verifier);
3060         }
3061
3062         /* Parse layoutget results before we check for access */
3063         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3064
3065         ret = nfs4_opendata_access(sp->so_cred, opendata, state,
3066                         acc_mode, flags);
3067         if (ret != 0)
3068                 goto out;
3069
3070         if (d_inode(dentry) == state->inode) {
3071                 nfs_inode_attach_open_context(ctx);
3072                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3073                         nfs4_schedule_stateid_recovery(server, state);
3074         }
3075
3076 out:
3077         if (!opendata->cancelled)
3078                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3079         return ret;
3080 }
3081
3082 /*
3083  * Returns a referenced nfs4_state
3084  */
3085 static int _nfs4_do_open(struct inode *dir,
3086                         struct nfs_open_context *ctx,
3087                         int flags,
3088                         const struct nfs4_open_createattrs *c,
3089                         int *opened)
3090 {
3091         struct nfs4_state_owner  *sp;
3092         struct nfs4_state     *state = NULL;
3093         struct nfs_server       *server = NFS_SERVER(dir);
3094         struct nfs4_opendata *opendata;
3095         struct dentry *dentry = ctx->dentry;
3096         const struct cred *cred = ctx->cred;
3097         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3098         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3099         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3100         struct iattr *sattr = c->sattr;
3101         struct nfs4_label *label = c->label;
3102         struct nfs4_label *olabel = NULL;
3103         int status;
3104
3105         /* Protect against reboot recovery conflicts */
3106         status = -ENOMEM;
3107         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3108         if (sp == NULL) {
3109                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3110                 goto out_err;
3111         }
3112         status = nfs4_client_recover_expired_lease(server->nfs_client);
3113         if (status != 0)
3114                 goto err_put_state_owner;
3115         if (d_really_is_positive(dentry))
3116                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3117         status = -ENOMEM;
3118         if (d_really_is_positive(dentry))
3119                 claim = NFS4_OPEN_CLAIM_FH;
3120         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3121                         c, claim, GFP_KERNEL);
3122         if (opendata == NULL)
3123                 goto err_put_state_owner;
3124
3125         if (label) {
3126                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
3127                 if (IS_ERR(olabel)) {
3128                         status = PTR_ERR(olabel);
3129                         goto err_opendata_put;
3130                 }
3131         }
3132
3133         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3134                 if (!opendata->f_attr.mdsthreshold) {
3135                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3136                         if (!opendata->f_attr.mdsthreshold)
3137                                 goto err_free_label;
3138                 }
3139                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3140         }
3141         if (d_really_is_positive(dentry))
3142                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3143
3144         status = _nfs4_open_and_get_state(opendata, flags, ctx);
3145         if (status != 0)
3146                 goto err_free_label;
3147         state = ctx->state;
3148
3149         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3150             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3151                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3152                 /*
3153                  * send create attributes which was not set by open
3154                  * with an extra setattr.
3155                  */
3156                 if (attrs || label) {
3157                         unsigned ia_old = sattr->ia_valid;
3158
3159                         sattr->ia_valid = attrs;
3160                         nfs_fattr_init(opendata->o_res.f_attr);
3161                         status = nfs4_do_setattr(state->inode, cred,
3162                                         opendata->o_res.f_attr, sattr,
3163                                         ctx, label, olabel);
3164                         if (status == 0) {
3165                                 nfs_setattr_update_inode(state->inode, sattr,
3166                                                 opendata->o_res.f_attr);
3167                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
3168                         }
3169                         sattr->ia_valid = ia_old;
3170                 }
3171         }
3172         if (opened && opendata->file_created)
3173                 *opened = 1;
3174
3175         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3176                 *ctx_th = opendata->f_attr.mdsthreshold;
3177                 opendata->f_attr.mdsthreshold = NULL;
3178         }
3179
3180         nfs4_label_free(olabel);
3181
3182         nfs4_opendata_put(opendata);
3183         nfs4_put_state_owner(sp);
3184         return 0;
3185 err_free_label:
3186         nfs4_label_free(olabel);
3187 err_opendata_put:
3188         nfs4_opendata_put(opendata);
3189 err_put_state_owner:
3190         nfs4_put_state_owner(sp);
3191 out_err:
3192         return status;
3193 }
3194
3195
3196 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3197                                         struct nfs_open_context *ctx,
3198                                         int flags,
3199                                         struct iattr *sattr,
3200                                         struct nfs4_label *label,
3201                                         int *opened)
3202 {
3203         struct nfs_server *server = NFS_SERVER(dir);
3204         struct nfs4_exception exception = {
3205                 .interruptible = true,
3206         };
3207         struct nfs4_state *res;
3208         struct nfs4_open_createattrs c = {
3209                 .label = label,
3210                 .sattr = sattr,
3211                 .verf = {
3212                         [0] = (__u32)jiffies,
3213                         [1] = (__u32)current->pid,
3214                 },
3215         };
3216         int status;
3217
3218         do {
3219                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3220                 res = ctx->state;
3221                 trace_nfs4_open_file(ctx, flags, status);
3222                 if (status == 0)
3223                         break;
3224                 /* NOTE: BAD_SEQID means the server and client disagree about the
3225                  * book-keeping w.r.t. state-changing operations
3226                  * (OPEN/CLOSE/LOCK/LOCKU...)
3227                  * It is actually a sign of a bug on the client or on the server.
3228                  *
3229                  * If we receive a BAD_SEQID error in the particular case of
3230                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3231                  * have unhashed the old state_owner for us, and that we can
3232                  * therefore safely retry using a new one. We should still warn
3233                  * the user though...
3234                  */
3235                 if (status == -NFS4ERR_BAD_SEQID) {
3236                         pr_warn_ratelimited("NFS: v4 server %s "
3237                                         " returned a bad sequence-id error!\n",
3238                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3239                         exception.retry = 1;
3240                         continue;
3241                 }
3242                 /*
3243                  * BAD_STATEID on OPEN means that the server cancelled our
3244                  * state before it received the OPEN_CONFIRM.
3245                  * Recover by retrying the request as per the discussion
3246                  * on Page 181 of RFC3530.
3247                  */
3248                 if (status == -NFS4ERR_BAD_STATEID) {
3249                         exception.retry = 1;
3250                         continue;
3251                 }
3252                 if (status == -NFS4ERR_EXPIRED) {
3253                         nfs4_schedule_lease_recovery(server->nfs_client);
3254                         exception.retry = 1;
3255                         continue;
3256                 }
3257                 if (status == -EAGAIN) {
3258                         /* We must have found a delegation */
3259                         exception.retry = 1;
3260                         continue;
3261                 }
3262                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3263                         continue;
3264                 res = ERR_PTR(nfs4_handle_exception(server,
3265                                         status, &exception));
3266         } while (exception.retry);
3267         return res;
3268 }
3269
3270 static int _nfs4_do_setattr(struct inode *inode,
3271                             struct nfs_setattrargs *arg,
3272                             struct nfs_setattrres *res,
3273                             const struct cred *cred,
3274                             struct nfs_open_context *ctx)
3275 {
3276         struct nfs_server *server = NFS_SERVER(inode);
3277         struct rpc_message msg = {
3278                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3279                 .rpc_argp       = arg,
3280                 .rpc_resp       = res,
3281                 .rpc_cred       = cred,
3282         };
3283         const struct cred *delegation_cred = NULL;
3284         unsigned long timestamp = jiffies;
3285         bool truncate;
3286         int status;
3287
3288         nfs_fattr_init(res->fattr);
3289
3290         /* Servers should only apply open mode checks for file size changes */
3291         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3292         if (!truncate) {
3293                 nfs4_inode_make_writeable(inode);
3294                 goto zero_stateid;
3295         }
3296
3297         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3298                 /* Use that stateid */
3299         } else if (ctx != NULL && ctx->state) {
3300                 struct nfs_lock_context *l_ctx;
3301                 if (!nfs4_valid_open_stateid(ctx->state))
3302                         return -EBADF;
3303                 l_ctx = nfs_get_lock_context(ctx);
3304                 if (IS_ERR(l_ctx))
3305                         return PTR_ERR(l_ctx);
3306                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3307                                                 &arg->stateid, &delegation_cred);
3308                 nfs_put_lock_context(l_ctx);
3309                 if (status == -EIO)
3310                         return -EBADF;
3311                 else if (status == -EAGAIN)
3312                         goto zero_stateid;
3313         } else {
3314 zero_stateid:
3315                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3316         }
3317         if (delegation_cred)
3318                 msg.rpc_cred = delegation_cred;
3319
3320         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3321
3322         put_cred(delegation_cred);
3323         if (status == 0 && ctx != NULL)
3324                 renew_lease(server, timestamp);
3325         trace_nfs4_setattr(inode, &arg->stateid, status);
3326         return status;
3327 }
3328
3329 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3330                            struct nfs_fattr *fattr, struct iattr *sattr,
3331                            struct nfs_open_context *ctx, struct nfs4_label *ilabel,
3332                            struct nfs4_label *olabel)
3333 {
3334         struct nfs_server *server = NFS_SERVER(inode);
3335         __u32 bitmask[NFS4_BITMASK_SZ];
3336         struct nfs4_state *state = ctx ? ctx->state : NULL;
3337         struct nfs_setattrargs  arg = {
3338                 .fh             = NFS_FH(inode),
3339                 .iap            = sattr,
3340                 .server         = server,
3341                 .bitmask = bitmask,
3342                 .label          = ilabel,
3343         };
3344         struct nfs_setattrres  res = {
3345                 .fattr          = fattr,
3346                 .label          = olabel,
3347                 .server         = server,
3348         };
3349         struct nfs4_exception exception = {
3350                 .state = state,
3351                 .inode = inode,
3352                 .stateid = &arg.stateid,
3353         };
3354         int err;
3355
3356         do {
3357                 nfs4_bitmap_copy_adjust_setattr(bitmask,
3358                                 nfs4_bitmask(server, olabel),
3359                                 inode);
3360
3361                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3362                 switch (err) {
3363                 case -NFS4ERR_OPENMODE:
3364                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3365                                 pr_warn_once("NFSv4: server %s is incorrectly "
3366                                                 "applying open mode checks to "
3367                                                 "a SETATTR that is not "
3368                                                 "changing file size.\n",
3369                                                 server->nfs_client->cl_hostname);
3370                         }
3371                         if (state && !(state->state & FMODE_WRITE)) {
3372                                 err = -EBADF;
3373                                 if (sattr->ia_valid & ATTR_OPEN)
3374                                         err = -EACCES;
3375                                 goto out;
3376                         }
3377                 }
3378                 err = nfs4_handle_exception(server, err, &exception);
3379         } while (exception.retry);
3380 out:
3381         return err;
3382 }
3383
3384 static bool
3385 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3386 {
3387         if (inode == NULL || !nfs_have_layout(inode))
3388                 return false;
3389
3390         return pnfs_wait_on_layoutreturn(inode, task);
3391 }
3392
3393 /*
3394  * Update the seqid of an open stateid
3395  */
3396 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3397                 struct nfs4_state *state)
3398 {
3399         __be32 seqid_open;
3400         u32 dst_seqid;
3401         int seq;
3402
3403         for (;;) {
3404                 if (!nfs4_valid_open_stateid(state))
3405                         break;
3406                 seq = read_seqbegin(&state->seqlock);
3407                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3408                         nfs4_stateid_copy(dst, &state->open_stateid);
3409                         if (read_seqretry(&state->seqlock, seq))
3410                                 continue;
3411                         break;
3412                 }
3413                 seqid_open = state->open_stateid.seqid;
3414                 if (read_seqretry(&state->seqlock, seq))
3415                         continue;
3416
3417                 dst_seqid = be32_to_cpu(dst->seqid);
3418                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3419                         dst->seqid = seqid_open;
3420                 break;
3421         }
3422 }
3423
3424 /*
3425  * Update the seqid of an open stateid after receiving
3426  * NFS4ERR_OLD_STATEID
3427  */
3428 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3429                 struct nfs4_state *state)
3430 {
3431         __be32 seqid_open;
3432         u32 dst_seqid;
3433         bool ret;
3434         int seq, status = -EAGAIN;
3435         DEFINE_WAIT(wait);
3436
3437         for (;;) {
3438                 ret = false;
3439                 if (!nfs4_valid_open_stateid(state))
3440                         break;
3441                 seq = read_seqbegin(&state->seqlock);
3442                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3443                         if (read_seqretry(&state->seqlock, seq))
3444                                 continue;
3445                         break;
3446                 }
3447
3448                 write_seqlock(&state->seqlock);
3449                 seqid_open = state->open_stateid.seqid;
3450
3451                 dst_seqid = be32_to_cpu(dst->seqid);
3452
3453                 /* Did another OPEN bump the state's seqid?  try again: */
3454                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3455                         dst->seqid = seqid_open;
3456                         write_sequnlock(&state->seqlock);
3457                         ret = true;
3458                         break;
3459                 }
3460
3461                 /* server says we're behind but we haven't seen the update yet */
3462                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3463                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3464                 write_sequnlock(&state->seqlock);
3465                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3466
3467                 if (signal_pending(current))
3468                         status = -EINTR;
3469                 else
3470                         if (schedule_timeout(5*HZ) != 0)
3471                                 status = 0;
3472
3473                 finish_wait(&state->waitq, &wait);
3474
3475                 if (!status)
3476                         continue;
3477                 if (status == -EINTR)
3478                         break;
3479
3480                 /* we slept the whole 5 seconds, we must have lost a seqid */
3481                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3482                 ret = true;
3483                 break;
3484         }
3485
3486         return ret;
3487 }
3488
3489 struct nfs4_closedata {
3490         struct inode *inode;
3491         struct nfs4_state *state;
3492         struct nfs_closeargs arg;
3493         struct nfs_closeres res;
3494         struct {
3495                 struct nfs4_layoutreturn_args arg;
3496                 struct nfs4_layoutreturn_res res;
3497                 struct nfs4_xdr_opaque_data ld_private;
3498                 u32 roc_barrier;
3499                 bool roc;
3500         } lr;
3501         struct nfs_fattr fattr;
3502         unsigned long timestamp;
3503 };
3504
3505 static void nfs4_free_closedata(void *data)
3506 {
3507         struct nfs4_closedata *calldata = data;
3508         struct nfs4_state_owner *sp = calldata->state->owner;
3509         struct super_block *sb = calldata->state->inode->i_sb;
3510
3511         if (calldata->lr.roc)
3512                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3513                                 calldata->res.lr_ret);
3514         nfs4_put_open_state(calldata->state);
3515         nfs_free_seqid(calldata->arg.seqid);
3516         nfs4_put_state_owner(sp);
3517         nfs_sb_deactive(sb);
3518         kfree(calldata);
3519 }
3520
3521 static void nfs4_close_done(struct rpc_task *task, void *data)
3522 {
3523         struct nfs4_closedata *calldata = data;
3524         struct nfs4_state *state = calldata->state;
3525         struct nfs_server *server = NFS_SERVER(calldata->inode);
3526         nfs4_stateid *res_stateid = NULL;
3527         struct nfs4_exception exception = {
3528                 .state = state,
3529                 .inode = calldata->inode,
3530                 .stateid = &calldata->arg.stateid,
3531         };
3532
3533         dprintk("%s: begin!\n", __func__);
3534         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3535                 return;
3536         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3537
3538         /* Handle Layoutreturn errors */
3539         if (pnfs_roc_done(task, calldata->inode,
3540                                 &calldata->arg.lr_args,
3541                                 &calldata->res.lr_res,
3542                                 &calldata->res.lr_ret) == -EAGAIN)
3543                 goto out_restart;
3544
3545         /* hmm. we are done with the inode, and in the process of freeing
3546          * the state_owner. we keep this around to process errors
3547          */
3548         switch (task->tk_status) {
3549                 case 0:
3550                         res_stateid = &calldata->res.stateid;
3551                         renew_lease(server, calldata->timestamp);
3552                         break;
3553                 case -NFS4ERR_ACCESS:
3554                         if (calldata->arg.bitmask != NULL) {
3555                                 calldata->arg.bitmask = NULL;
3556                                 calldata->res.fattr = NULL;
3557                                 goto out_restart;
3558
3559                         }
3560                         break;
3561                 case -NFS4ERR_OLD_STATEID:
3562                         /* Did we race with OPEN? */
3563                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3564                                                 state))
3565                                 goto out_restart;
3566                         goto out_release;
3567                 case -NFS4ERR_ADMIN_REVOKED:
3568                 case -NFS4ERR_STALE_STATEID:
3569                 case -NFS4ERR_EXPIRED:
3570                         nfs4_free_revoked_stateid(server,
3571                                         &calldata->arg.stateid,
3572                                         task->tk_msg.rpc_cred);
3573                         fallthrough;
3574                 case -NFS4ERR_BAD_STATEID:
3575                         if (calldata->arg.fmode == 0)
3576                                 break;
3577                         fallthrough;
3578                 default:
3579                         task->tk_status = nfs4_async_handle_exception(task,
3580                                         server, task->tk_status, &exception);
3581                         if (exception.retry)
3582                                 goto out_restart;
3583         }
3584         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3585                         res_stateid, calldata->arg.fmode);
3586 out_release:
3587         task->tk_status = 0;
3588         nfs_release_seqid(calldata->arg.seqid);
3589         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3590         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3591         return;
3592 out_restart:
3593         task->tk_status = 0;
3594         rpc_restart_call_prepare(task);
3595         goto out_release;
3596 }
3597
3598 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3599 {
3600         struct nfs4_closedata *calldata = data;
3601         struct nfs4_state *state = calldata->state;
3602         struct inode *inode = calldata->inode;
3603         struct pnfs_layout_hdr *lo;
3604         bool is_rdonly, is_wronly, is_rdwr;
3605         int call_close = 0;
3606
3607         dprintk("%s: begin!\n", __func__);
3608         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3609                 goto out_wait;
3610
3611         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3612         spin_lock(&state->owner->so_lock);
3613         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3614         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3615         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3616         /* Calculate the change in open mode */
3617         calldata->arg.fmode = 0;
3618         if (state->n_rdwr == 0) {
3619                 if (state->n_rdonly == 0)
3620                         call_close |= is_rdonly;
3621                 else if (is_rdonly)
3622                         calldata->arg.fmode |= FMODE_READ;
3623                 if (state->n_wronly == 0)
3624                         call_close |= is_wronly;
3625                 else if (is_wronly)
3626                         calldata->arg.fmode |= FMODE_WRITE;
3627                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3628                         call_close |= is_rdwr;
3629         } else if (is_rdwr)
3630                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3631
3632         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3633         if (!nfs4_valid_open_stateid(state))
3634                 call_close = 0;
3635         spin_unlock(&state->owner->so_lock);
3636
3637         if (!call_close) {
3638                 /* Note: exit _without_ calling nfs4_close_done */
3639                 goto out_no_action;
3640         }
3641
3642         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3643                 nfs_release_seqid(calldata->arg.seqid);
3644                 goto out_wait;
3645         }
3646
3647         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3648         if (lo && !pnfs_layout_is_valid(lo)) {
3649                 calldata->arg.lr_args = NULL;
3650                 calldata->res.lr_res = NULL;
3651         }
3652
3653         if (calldata->arg.fmode == 0)
3654                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3655
3656         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3657                 /* Close-to-open cache consistency revalidation */
3658                 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3659                         calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3660                         nfs4_bitmask_adjust(calldata->arg.bitmask, inode, NFS_SERVER(inode), NULL);
3661                 } else
3662                         calldata->arg.bitmask = NULL;
3663         }
3664
3665         calldata->arg.share_access =
3666                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3667                                 calldata->arg.fmode, 0);
3668
3669         if (calldata->res.fattr == NULL)
3670                 calldata->arg.bitmask = NULL;
3671         else if (calldata->arg.bitmask == NULL)
3672                 calldata->res.fattr = NULL;
3673         calldata->timestamp = jiffies;
3674         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3675                                 &calldata->arg.seq_args,
3676                                 &calldata->res.seq_res,
3677                                 task) != 0)
3678                 nfs_release_seqid(calldata->arg.seqid);
3679         dprintk("%s: done!\n", __func__);
3680         return;
3681 out_no_action:
3682         task->tk_action = NULL;
3683 out_wait:
3684         nfs4_sequence_done(task, &calldata->res.seq_res);
3685 }
3686
3687 static const struct rpc_call_ops nfs4_close_ops = {
3688         .rpc_call_prepare = nfs4_close_prepare,
3689         .rpc_call_done = nfs4_close_done,
3690         .rpc_release = nfs4_free_closedata,
3691 };
3692
3693 /*
3694  * It is possible for data to be read/written from a mem-mapped file
3695  * after the sys_close call (which hits the vfs layer as a flush).
3696  * This means that we can't safely call nfsv4 close on a file until
3697  * the inode is cleared. This in turn means that we are not good
3698  * NFSv4 citizens - we do not indicate to the server to update the file's
3699  * share state even when we are done with one of the three share
3700  * stateid's in the inode.
3701  *
3702  * NOTE: Caller must be holding the sp->so_owner semaphore!
3703  */
3704 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3705 {
3706         struct nfs_server *server = NFS_SERVER(state->inode);
3707         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3708         struct nfs4_closedata *calldata;
3709         struct nfs4_state_owner *sp = state->owner;
3710         struct rpc_task *task;
3711         struct rpc_message msg = {
3712                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3713                 .rpc_cred = state->owner->so_cred,
3714         };
3715         struct rpc_task_setup task_setup_data = {
3716                 .rpc_client = server->client,
3717                 .rpc_message = &msg,
3718                 .callback_ops = &nfs4_close_ops,
3719                 .workqueue = nfsiod_workqueue,
3720                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3721         };
3722         int status = -ENOMEM;
3723
3724         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3725                 &task_setup_data.rpc_client, &msg);
3726
3727         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3728         if (calldata == NULL)
3729                 goto out;
3730         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3731         calldata->inode = state->inode;
3732         calldata->state = state;
3733         calldata->arg.fh = NFS_FH(state->inode);
3734         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3735                 goto out_free_calldata;
3736         /* Serialization for the sequence id */
3737         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3738         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3739         if (IS_ERR(calldata->arg.seqid))
3740                 goto out_free_calldata;
3741         nfs_fattr_init(&calldata->fattr);
3742         calldata->arg.fmode = 0;
3743         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3744         calldata->res.fattr = &calldata->fattr;
3745         calldata->res.seqid = calldata->arg.seqid;
3746         calldata->res.server = server;
3747         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3748         calldata->lr.roc = pnfs_roc(state->inode,
3749                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3750         if (calldata->lr.roc) {
3751                 calldata->arg.lr_args = &calldata->lr.arg;
3752                 calldata->res.lr_res = &calldata->lr.res;
3753         }
3754         nfs_sb_active(calldata->inode->i_sb);
3755
3756         msg.rpc_argp = &calldata->arg;
3757         msg.rpc_resp = &calldata->res;
3758         task_setup_data.callback_data = calldata;
3759         task = rpc_run_task(&task_setup_data);
3760         if (IS_ERR(task))
3761                 return PTR_ERR(task);
3762         status = 0;
3763         if (wait)
3764                 status = rpc_wait_for_completion_task(task);
3765         rpc_put_task(task);
3766         return status;
3767 out_free_calldata:
3768         kfree(calldata);
3769 out:
3770         nfs4_put_open_state(state);
3771         nfs4_put_state_owner(sp);
3772         return status;
3773 }
3774
3775 static struct inode *
3776 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3777                 int open_flags, struct iattr *attr, int *opened)
3778 {
3779         struct nfs4_state *state;
3780         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3781
3782         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3783
3784         /* Protect against concurrent sillydeletes */
3785         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3786
3787         nfs4_label_release_security(label);
3788
3789         if (IS_ERR(state))
3790                 return ERR_CAST(state);
3791         return state->inode;
3792 }
3793
3794 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3795 {
3796         if (ctx->state == NULL)
3797                 return;
3798         if (is_sync)
3799                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3800         else
3801                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3802 }
3803
3804 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3805 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3806 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3807
3808 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3809 {
3810         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3811         struct nfs4_server_caps_arg args = {
3812                 .fhandle = fhandle,
3813                 .bitmask = bitmask,
3814         };
3815         struct nfs4_server_caps_res res = {};
3816         struct rpc_message msg = {
3817                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3818                 .rpc_argp = &args,
3819                 .rpc_resp = &res,
3820         };
3821         int status;
3822         int i;
3823
3824         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3825                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3826                      FATTR4_WORD0_LINK_SUPPORT |
3827                      FATTR4_WORD0_SYMLINK_SUPPORT |
3828                      FATTR4_WORD0_ACLSUPPORT;
3829         if (minorversion)
3830                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3831
3832         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3833         if (status == 0) {
3834                 /* Sanity check the server answers */
3835                 switch (minorversion) {
3836                 case 0:
3837                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3838                         res.attr_bitmask[2] = 0;
3839                         break;
3840                 case 1:
3841                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3842                         break;
3843                 case 2:
3844                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3845                 }
3846                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3847                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3848                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3849                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3850                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3851                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3852                                 NFS_CAP_SECURITY_LABEL);
3853                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3854                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3855                         server->caps |= NFS_CAP_ACLS;
3856                 if (res.has_links != 0)
3857                         server->caps |= NFS_CAP_HARDLINKS;
3858                 if (res.has_symlinks != 0)
3859                         server->caps |= NFS_CAP_SYMLINKS;
3860                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3861                         server->caps |= NFS_CAP_FILEID;
3862                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3863                         server->caps |= NFS_CAP_MODE;
3864                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3865                         server->caps |= NFS_CAP_NLINK;
3866                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3867                         server->caps |= NFS_CAP_OWNER;
3868                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3869                         server->caps |= NFS_CAP_OWNER_GROUP;
3870                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3871                         server->caps |= NFS_CAP_ATIME;
3872                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3873                         server->caps |= NFS_CAP_CTIME;
3874                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3875                         server->caps |= NFS_CAP_MTIME;
3876 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3877                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3878                         server->caps |= NFS_CAP_SECURITY_LABEL;
3879 #endif
3880                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3881                                 sizeof(server->attr_bitmask));
3882                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3883
3884                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3885                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3886                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3887                 server->cache_consistency_bitmask[2] = 0;
3888
3889                 /* Avoid a regression due to buggy server */
3890                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3891                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3892                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3893                         sizeof(server->exclcreat_bitmask));
3894
3895                 server->acl_bitmask = res.acl_bitmask;
3896                 server->fh_expire_type = res.fh_expire_type;
3897         }
3898
3899         return status;
3900 }
3901
3902 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3903 {
3904         struct nfs4_exception exception = {
3905                 .interruptible = true,
3906         };
3907         int err;
3908         do {
3909                 err = nfs4_handle_exception(server,
3910                                 _nfs4_server_capabilities(server, fhandle),
3911                                 &exception);
3912         } while (exception.retry);
3913         return err;
3914 }
3915
3916 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3917                 struct nfs_fsinfo *info)
3918 {
3919         u32 bitmask[3];
3920         struct nfs4_lookup_root_arg args = {
3921                 .bitmask = bitmask,
3922         };
3923         struct nfs4_lookup_res res = {
3924                 .server = server,
3925                 .fattr = info->fattr,
3926                 .fh = fhandle,
3927         };
3928         struct rpc_message msg = {
3929                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3930                 .rpc_argp = &args,
3931                 .rpc_resp = &res,
3932         };
3933
3934         bitmask[0] = nfs4_fattr_bitmap[0];
3935         bitmask[1] = nfs4_fattr_bitmap[1];
3936         /*
3937          * Process the label in the upcoming getfattr
3938          */
3939         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3940
3941         nfs_fattr_init(info->fattr);
3942         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3943 }
3944
3945 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3946                 struct nfs_fsinfo *info)
3947 {
3948         struct nfs4_exception exception = {
3949                 .interruptible = true,
3950         };
3951         int err;
3952         do {
3953                 err = _nfs4_lookup_root(server, fhandle, info);
3954                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3955                 switch (err) {
3956                 case 0:
3957                 case -NFS4ERR_WRONGSEC:
3958                         goto out;
3959                 default:
3960                         err = nfs4_handle_exception(server, err, &exception);
3961                 }
3962         } while (exception.retry);
3963 out:
3964         return err;
3965 }
3966
3967 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3968                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3969 {
3970         struct rpc_auth_create_args auth_args = {
3971                 .pseudoflavor = flavor,
3972         };
3973         struct rpc_auth *auth;
3974
3975         auth = rpcauth_create(&auth_args, server->client);
3976         if (IS_ERR(auth))
3977                 return -EACCES;
3978         return nfs4_lookup_root(server, fhandle, info);
3979 }
3980
3981 /*
3982  * Retry pseudoroot lookup with various security flavors.  We do this when:
3983  *
3984  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3985  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3986  *
3987  * Returns zero on success, or a negative NFS4ERR value, or a
3988  * negative errno value.
3989  */
3990 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3991                               struct nfs_fsinfo *info)
3992 {
3993         /* Per 3530bis 15.33.5 */
3994         static const rpc_authflavor_t flav_array[] = {
3995                 RPC_AUTH_GSS_KRB5P,
3996                 RPC_AUTH_GSS_KRB5I,
3997                 RPC_AUTH_GSS_KRB5,
3998                 RPC_AUTH_UNIX,                  /* courtesy */
3999                 RPC_AUTH_NULL,
4000         };
4001         int status = -EPERM;
4002         size_t i;
4003
4004         if (server->auth_info.flavor_len > 0) {
4005                 /* try each flavor specified by user */
4006                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4007                         status = nfs4_lookup_root_sec(server, fhandle, info,
4008                                                 server->auth_info.flavors[i]);
4009                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4010                                 continue;
4011                         break;
4012                 }
4013         } else {
4014                 /* no flavors specified by user, try default list */
4015                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4016                         status = nfs4_lookup_root_sec(server, fhandle, info,
4017                                                       flav_array[i]);
4018                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4019                                 continue;
4020                         break;
4021                 }
4022         }
4023
4024         /*
4025          * -EACCES could mean that the user doesn't have correct permissions
4026          * to access the mount.  It could also mean that we tried to mount
4027          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4028          * existing mount programs don't handle -EACCES very well so it should
4029          * be mapped to -EPERM instead.
4030          */
4031         if (status == -EACCES)
4032                 status = -EPERM;
4033         return status;
4034 }
4035
4036 /**
4037  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4038  * @server: initialized nfs_server handle
4039  * @fhandle: we fill in the pseudo-fs root file handle
4040  * @info: we fill in an FSINFO struct
4041  * @auth_probe: probe the auth flavours
4042  *
4043  * Returns zero on success, or a negative errno.
4044  */
4045 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4046                          struct nfs_fsinfo *info,
4047                          bool auth_probe)
4048 {
4049         int status = 0;
4050
4051         if (!auth_probe)
4052                 status = nfs4_lookup_root(server, fhandle, info);
4053
4054         if (auth_probe || status == NFS4ERR_WRONGSEC)
4055                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4056                                 fhandle, info);
4057
4058         if (status == 0)
4059                 status = nfs4_server_capabilities(server, fhandle);
4060         if (status == 0)
4061                 status = nfs4_do_fsinfo(server, fhandle, info);
4062
4063         return nfs4_map_errors(status);
4064 }
4065
4066 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4067                               struct nfs_fsinfo *info)
4068 {
4069         int error;
4070         struct nfs_fattr *fattr = info->fattr;
4071         struct nfs4_label *label = fattr->label;
4072
4073         error = nfs4_server_capabilities(server, mntfh);
4074         if (error < 0) {
4075                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4076                 return error;
4077         }
4078
4079         error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL);
4080         if (error < 0) {
4081                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4082                 goto out;
4083         }
4084
4085         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4086             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4087                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4088
4089 out:
4090         return error;
4091 }
4092
4093 /*
4094  * Get locations and (maybe) other attributes of a referral.
4095  * Note that we'll actually follow the referral later when
4096  * we detect fsid mismatch in inode revalidation
4097  */
4098 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4099                              const struct qstr *name, struct nfs_fattr *fattr,
4100                              struct nfs_fh *fhandle)
4101 {
4102         int status = -ENOMEM;
4103         struct page *page = NULL;
4104         struct nfs4_fs_locations *locations = NULL;
4105
4106         page = alloc_page(GFP_KERNEL);
4107         if (page == NULL)
4108                 goto out;
4109         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4110         if (locations == NULL)
4111                 goto out;
4112
4113         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4114         if (status != 0)
4115                 goto out;
4116
4117         /*
4118          * If the fsid didn't change, this is a migration event, not a
4119          * referral.  Cause us to drop into the exception handler, which
4120          * will kick off migration recovery.
4121          */
4122         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
4123                 dprintk("%s: server did not return a different fsid for"
4124                         " a referral at %s\n", __func__, name->name);
4125                 status = -NFS4ERR_MOVED;
4126                 goto out;
4127         }
4128         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4129         nfs_fixup_referral_attributes(&locations->fattr);
4130
4131         /* replace the lookup nfs_fattr with the locations nfs_fattr */
4132         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
4133         memset(fhandle, 0, sizeof(struct nfs_fh));
4134 out:
4135         if (page)
4136                 __free_page(page);
4137         kfree(locations);
4138         return status;
4139 }
4140
4141 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4142                                 struct nfs_fattr *fattr, struct nfs4_label *label,
4143                                 struct inode *inode)
4144 {
4145         __u32 bitmask[NFS4_BITMASK_SZ];
4146         struct nfs4_getattr_arg args = {
4147                 .fh = fhandle,
4148                 .bitmask = bitmask,
4149         };
4150         struct nfs4_getattr_res res = {
4151                 .fattr = fattr,
4152                 .label = label,
4153                 .server = server,
4154         };
4155         struct rpc_message msg = {
4156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4157                 .rpc_argp = &args,
4158                 .rpc_resp = &res,
4159         };
4160         unsigned short task_flags = 0;
4161
4162         /* Is this is an attribute revalidation, subject to softreval? */
4163         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4164                 task_flags |= RPC_TASK_TIMEOUT;
4165
4166         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode);
4167
4168         nfs_fattr_init(fattr);
4169         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4170         return nfs4_do_call_sync(server->client, server, &msg,
4171                         &args.seq_args, &res.seq_res, task_flags);
4172 }
4173
4174 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4175                                 struct nfs_fattr *fattr, struct nfs4_label *label,
4176                                 struct inode *inode)
4177 {
4178         struct nfs4_exception exception = {
4179                 .interruptible = true,
4180         };
4181         int err;
4182         do {
4183                 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode);
4184                 trace_nfs4_getattr(server, fhandle, fattr, err);
4185                 err = nfs4_handle_exception(server, err,
4186                                 &exception);
4187         } while (exception.retry);
4188         return err;
4189 }
4190
4191 /*
4192  * The file is not closed if it is opened due to the a request to change
4193  * the size of the file. The open call will not be needed once the
4194  * VFS layer lookup-intents are implemented.
4195  *
4196  * Close is called when the inode is destroyed.
4197  * If we haven't opened the file for O_WRONLY, we
4198  * need to in the size_change case to obtain a stateid.
4199  *
4200  * Got race?
4201  * Because OPEN is always done by name in nfsv4, it is
4202  * possible that we opened a different file by the same
4203  * name.  We can recognize this race condition, but we
4204  * can't do anything about it besides returning an error.
4205  *
4206  * This will be fixed with VFS changes (lookup-intent).
4207  */
4208 static int
4209 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4210                   struct iattr *sattr)
4211 {
4212         struct inode *inode = d_inode(dentry);
4213         const struct cred *cred = NULL;
4214         struct nfs_open_context *ctx = NULL;
4215         struct nfs4_label *label = NULL;
4216         int status;
4217
4218         if (pnfs_ld_layoutret_on_setattr(inode) &&
4219             sattr->ia_valid & ATTR_SIZE &&
4220             sattr->ia_size < i_size_read(inode))
4221                 pnfs_commit_and_return_layout(inode);
4222
4223         nfs_fattr_init(fattr);
4224
4225         /* Deal with open(O_TRUNC) */
4226         if (sattr->ia_valid & ATTR_OPEN)
4227                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4228
4229         /* Optimization: if the end result is no change, don't RPC */
4230         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4231                 return 0;
4232
4233         /* Search for an existing open(O_WRITE) file */
4234         if (sattr->ia_valid & ATTR_FILE) {
4235
4236                 ctx = nfs_file_open_context(sattr->ia_file);
4237                 if (ctx)
4238                         cred = ctx->cred;
4239         }
4240
4241         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4242         if (IS_ERR(label))
4243                 return PTR_ERR(label);
4244
4245         /* Return any delegations if we're going to change ACLs */
4246         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4247                 nfs4_inode_make_writeable(inode);
4248
4249         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label);
4250         if (status == 0) {
4251                 nfs_setattr_update_inode(inode, sattr, fattr);
4252                 nfs_setsecurity(inode, fattr, label);
4253         }
4254         nfs4_label_free(label);
4255         return status;
4256 }
4257
4258 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4259                 struct dentry *dentry, struct nfs_fh *fhandle,
4260                 struct nfs_fattr *fattr, struct nfs4_label *label)
4261 {
4262         struct nfs_server *server = NFS_SERVER(dir);
4263         int                    status;
4264         struct nfs4_lookup_arg args = {
4265                 .bitmask = server->attr_bitmask,
4266                 .dir_fh = NFS_FH(dir),
4267                 .name = &dentry->d_name,
4268         };
4269         struct nfs4_lookup_res res = {
4270                 .server = server,
4271                 .fattr = fattr,
4272                 .label = label,
4273                 .fh = fhandle,
4274         };
4275         struct rpc_message msg = {
4276                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4277                 .rpc_argp = &args,
4278                 .rpc_resp = &res,
4279         };
4280         unsigned short task_flags = 0;
4281
4282         /* Is this is an attribute revalidation, subject to softreval? */
4283         if (nfs_lookup_is_soft_revalidate(dentry))
4284                 task_flags |= RPC_TASK_TIMEOUT;
4285
4286         args.bitmask = nfs4_bitmask(server, label);
4287
4288         nfs_fattr_init(fattr);
4289
4290         dprintk("NFS call  lookup %pd2\n", dentry);
4291         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4292         status = nfs4_do_call_sync(clnt, server, &msg,
4293                         &args.seq_args, &res.seq_res, task_flags);
4294         dprintk("NFS reply lookup: %d\n", status);
4295         return status;
4296 }
4297
4298 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4299 {
4300         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4301                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4302         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4303         fattr->nlink = 2;
4304 }
4305
4306 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4307                                    struct dentry *dentry, struct nfs_fh *fhandle,
4308                                    struct nfs_fattr *fattr, struct nfs4_label *label)
4309 {
4310         struct nfs4_exception exception = {
4311                 .interruptible = true,
4312         };
4313         struct rpc_clnt *client = *clnt;
4314         const struct qstr *name = &dentry->d_name;
4315         int err;
4316         do {
4317                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr, label);
4318                 trace_nfs4_lookup(dir, name, err);
4319                 switch (err) {
4320                 case -NFS4ERR_BADNAME:
4321                         err = -ENOENT;
4322                         goto out;
4323                 case -NFS4ERR_MOVED:
4324                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4325                         if (err == -NFS4ERR_MOVED)
4326                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4327                         goto out;
4328                 case -NFS4ERR_WRONGSEC:
4329                         err = -EPERM;
4330                         if (client != *clnt)
4331                                 goto out;
4332                         client = nfs4_negotiate_security(client, dir, name);
4333                         if (IS_ERR(client))
4334                                 return PTR_ERR(client);
4335
4336                         exception.retry = 1;
4337                         break;
4338                 default:
4339                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4340                 }
4341         } while (exception.retry);
4342
4343 out:
4344         if (err == 0)
4345                 *clnt = client;
4346         else if (client != *clnt)
4347                 rpc_shutdown_client(client);
4348
4349         return err;
4350 }
4351
4352 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4353                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4354                             struct nfs4_label *label)
4355 {
4356         int status;
4357         struct rpc_clnt *client = NFS_CLIENT(dir);
4358
4359         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, label);
4360         if (client != NFS_CLIENT(dir)) {
4361                 rpc_shutdown_client(client);
4362                 nfs_fixup_secinfo_attributes(fattr);
4363         }
4364         return status;
4365 }
4366
4367 struct rpc_clnt *
4368 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4369                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4370 {
4371         struct rpc_clnt *client = NFS_CLIENT(dir);
4372         int status;
4373
4374         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, NULL);
4375         if (status < 0)
4376                 return ERR_PTR(status);
4377         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4378 }
4379
4380 static int _nfs4_proc_lookupp(struct inode *inode,
4381                 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4382                 struct nfs4_label *label)
4383 {
4384         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4385         struct nfs_server *server = NFS_SERVER(inode);
4386         int                    status;
4387         struct nfs4_lookupp_arg args = {
4388                 .bitmask = server->attr_bitmask,
4389                 .fh = NFS_FH(inode),
4390         };
4391         struct nfs4_lookupp_res res = {
4392                 .server = server,
4393                 .fattr = fattr,
4394                 .label = label,
4395                 .fh = fhandle,
4396         };
4397         struct rpc_message msg = {
4398                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4399                 .rpc_argp = &args,
4400                 .rpc_resp = &res,
4401         };
4402         unsigned short task_flags = 0;
4403
4404         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4405                 task_flags |= RPC_TASK_TIMEOUT;
4406
4407         args.bitmask = nfs4_bitmask(server, label);
4408
4409         nfs_fattr_init(fattr);
4410
4411         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4412         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4413                                 &res.seq_res, task_flags);
4414         dprintk("NFS reply lookupp: %d\n", status);
4415         return status;
4416 }
4417
4418 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4419                              struct nfs_fattr *fattr, struct nfs4_label *label)
4420 {
4421         struct nfs4_exception exception = {
4422                 .interruptible = true,
4423         };
4424         int err;
4425         do {
4426                 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label);
4427                 trace_nfs4_lookupp(inode, err);
4428                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4429                                 &exception);
4430         } while (exception.retry);
4431         return err;
4432 }
4433
4434 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4435 {
4436         struct nfs_server *server = NFS_SERVER(inode);
4437         struct nfs4_accessargs args = {
4438                 .fh = NFS_FH(inode),
4439                 .access = entry->mask,
4440         };
4441         struct nfs4_accessres res = {
4442                 .server = server,
4443         };
4444         struct rpc_message msg = {
4445                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4446                 .rpc_argp = &args,
4447                 .rpc_resp = &res,
4448                 .rpc_cred = entry->cred,
4449         };
4450         int status = 0;
4451
4452         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4453                 res.fattr = nfs_alloc_fattr();
4454                 if (res.fattr == NULL)
4455                         return -ENOMEM;
4456                 args.bitmask = server->cache_consistency_bitmask;
4457         }
4458         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4459         if (!status) {
4460                 nfs_access_set_mask(entry, res.access);
4461                 if (res.fattr)
4462                         nfs_refresh_inode(inode, res.fattr);
4463         }
4464         nfs_free_fattr(res.fattr);
4465         return status;
4466 }
4467
4468 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4469 {
4470         struct nfs4_exception exception = {
4471                 .interruptible = true,
4472         };
4473         int err;
4474         do {
4475                 err = _nfs4_proc_access(inode, entry);
4476                 trace_nfs4_access(inode, err);
4477                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4478                                 &exception);
4479         } while (exception.retry);
4480         return err;
4481 }
4482
4483 /*
4484  * TODO: For the time being, we don't try to get any attributes
4485  * along with any of the zero-copy operations READ, READDIR,
4486  * READLINK, WRITE.
4487  *
4488  * In the case of the first three, we want to put the GETATTR
4489  * after the read-type operation -- this is because it is hard
4490  * to predict the length of a GETATTR response in v4, and thus
4491  * align the READ data correctly.  This means that the GETATTR
4492  * may end up partially falling into the page cache, and we should
4493  * shift it into the 'tail' of the xdr_buf before processing.
4494  * To do this efficiently, we need to know the total length
4495  * of data received, which doesn't seem to be available outside
4496  * of the RPC layer.
4497  *
4498  * In the case of WRITE, we also want to put the GETATTR after
4499  * the operation -- in this case because we want to make sure
4500  * we get the post-operation mtime and size.
4501  *
4502  * Both of these changes to the XDR layer would in fact be quite
4503  * minor, but I decided to leave them for a subsequent patch.
4504  */
4505 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4506                 unsigned int pgbase, unsigned int pglen)
4507 {
4508         struct nfs4_readlink args = {
4509                 .fh       = NFS_FH(inode),
4510                 .pgbase   = pgbase,
4511                 .pglen    = pglen,
4512                 .pages    = &page,
4513         };
4514         struct nfs4_readlink_res res;
4515         struct rpc_message msg = {
4516                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4517                 .rpc_argp = &args,
4518                 .rpc_resp = &res,
4519         };
4520
4521         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4522 }
4523
4524 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4525                 unsigned int pgbase, unsigned int pglen)
4526 {
4527         struct nfs4_exception exception = {
4528                 .interruptible = true,
4529         };
4530         int err;
4531         do {
4532                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4533                 trace_nfs4_readlink(inode, err);
4534                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4535                                 &exception);
4536         } while (exception.retry);
4537         return err;
4538 }
4539
4540 /*
4541  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4542  */
4543 static int
4544 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4545                  int flags)
4546 {
4547         struct nfs_server *server = NFS_SERVER(dir);
4548         struct nfs4_label l, *ilabel = NULL;
4549         struct nfs_open_context *ctx;
4550         struct nfs4_state *state;
4551         int status = 0;
4552
4553         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4554         if (IS_ERR(ctx))
4555                 return PTR_ERR(ctx);
4556
4557         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4558
4559         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4560                 sattr->ia_mode &= ~current_umask();
4561         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4562         if (IS_ERR(state)) {
4563                 status = PTR_ERR(state);
4564                 goto out;
4565         }
4566 out:
4567         nfs4_label_release_security(ilabel);
4568         put_nfs_open_context(ctx);
4569         return status;
4570 }
4571
4572 static int
4573 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4574 {
4575         struct nfs_server *server = NFS_SERVER(dir);
4576         struct nfs_removeargs args = {
4577                 .fh = NFS_FH(dir),
4578                 .name = *name,
4579         };
4580         struct nfs_removeres res = {
4581                 .server = server,
4582         };
4583         struct rpc_message msg = {
4584                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4585                 .rpc_argp = &args,
4586                 .rpc_resp = &res,
4587         };
4588         unsigned long timestamp = jiffies;
4589         int status;
4590
4591         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4592         if (status == 0) {
4593                 spin_lock(&dir->i_lock);
4594                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4595                                               NFS_INO_INVALID_DATA);
4596                 /* Removing a directory decrements nlink in the parent */
4597                 if (ftype == NF4DIR && dir->i_nlink > 2)
4598                         nfs4_dec_nlink_locked(dir);
4599                 spin_unlock(&dir->i_lock);
4600         }
4601         return status;
4602 }
4603
4604 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4605 {
4606         struct nfs4_exception exception = {
4607                 .interruptible = true,
4608         };
4609         struct inode *inode = d_inode(dentry);
4610         int err;
4611
4612         if (inode) {
4613                 if (inode->i_nlink == 1)
4614                         nfs4_inode_return_delegation(inode);
4615                 else
4616                         nfs4_inode_make_writeable(inode);
4617         }
4618         do {
4619                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4620                 trace_nfs4_remove(dir, &dentry->d_name, err);
4621                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4622                                 &exception);
4623         } while (exception.retry);
4624         return err;
4625 }
4626
4627 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4628 {
4629         struct nfs4_exception exception = {
4630                 .interruptible = true,
4631         };
4632         int err;
4633
4634         do {
4635                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4636                 trace_nfs4_remove(dir, name, err);
4637                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4638                                 &exception);
4639         } while (exception.retry);
4640         return err;
4641 }
4642
4643 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4644                 struct dentry *dentry,
4645                 struct inode *inode)
4646 {
4647         struct nfs_removeargs *args = msg->rpc_argp;
4648         struct nfs_removeres *res = msg->rpc_resp;
4649
4650         res->server = NFS_SB(dentry->d_sb);
4651         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4652         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4653
4654         nfs_fattr_init(res->dir_attr);
4655
4656         if (inode)
4657                 nfs4_inode_return_delegation(inode);
4658 }
4659
4660 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4661 {
4662         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4663                         &data->args.seq_args,
4664                         &data->res.seq_res,
4665                         task);
4666 }
4667
4668 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4669 {
4670         struct nfs_unlinkdata *data = task->tk_calldata;
4671         struct nfs_removeres *res = &data->res;
4672
4673         if (!nfs4_sequence_done(task, &res->seq_res))
4674                 return 0;
4675         if (nfs4_async_handle_error(task, res->server, NULL,
4676                                     &data->timeout) == -EAGAIN)
4677                 return 0;
4678         if (task->tk_status == 0)
4679                 nfs4_update_changeattr(dir, &res->cinfo,
4680                                 res->dir_attr->time_start,
4681                                 NFS_INO_INVALID_DATA);
4682         return 1;
4683 }
4684
4685 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4686                 struct dentry *old_dentry,
4687                 struct dentry *new_dentry)
4688 {
4689         struct nfs_renameargs *arg = msg->rpc_argp;
4690         struct nfs_renameres *res = msg->rpc_resp;
4691         struct inode *old_inode = d_inode(old_dentry);
4692         struct inode *new_inode = d_inode(new_dentry);
4693
4694         if (old_inode)
4695                 nfs4_inode_make_writeable(old_inode);
4696         if (new_inode)
4697                 nfs4_inode_return_delegation(new_inode);
4698         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4699         res->server = NFS_SB(old_dentry->d_sb);
4700         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4701 }
4702
4703 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4704 {
4705         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4706                         &data->args.seq_args,
4707                         &data->res.seq_res,
4708                         task);
4709 }
4710
4711 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4712                                  struct inode *new_dir)
4713 {
4714         struct nfs_renamedata *data = task->tk_calldata;
4715         struct nfs_renameres *res = &data->res;
4716
4717         if (!nfs4_sequence_done(task, &res->seq_res))
4718                 return 0;
4719         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4720                 return 0;
4721
4722         if (task->tk_status == 0) {
4723                 if (new_dir != old_dir) {
4724                         /* Note: If we moved a directory, nlink will change */
4725                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4726                                         res->old_fattr->time_start,
4727                                         NFS_INO_INVALID_OTHER |
4728                                             NFS_INO_INVALID_DATA);
4729                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4730                                         res->new_fattr->time_start,
4731                                         NFS_INO_INVALID_OTHER |
4732                                             NFS_INO_INVALID_DATA);
4733                 } else
4734                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4735                                         res->old_fattr->time_start,
4736                                         NFS_INO_INVALID_DATA);
4737         }
4738         return 1;
4739 }
4740
4741 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4742 {
4743         struct nfs_server *server = NFS_SERVER(inode);
4744         __u32 bitmask[NFS4_BITMASK_SZ];
4745         struct nfs4_link_arg arg = {
4746                 .fh     = NFS_FH(inode),
4747                 .dir_fh = NFS_FH(dir),
4748                 .name   = name,
4749                 .bitmask = bitmask,
4750         };
4751         struct nfs4_link_res res = {
4752                 .server = server,
4753                 .label = NULL,
4754         };
4755         struct rpc_message msg = {
4756                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4757                 .rpc_argp = &arg,
4758                 .rpc_resp = &res,
4759         };
4760         int status = -ENOMEM;
4761
4762         res.fattr = nfs_alloc_fattr();
4763         if (res.fattr == NULL)
4764                 goto out;
4765
4766         res.label = nfs4_label_alloc(server, GFP_KERNEL);
4767         if (IS_ERR(res.label)) {
4768                 status = PTR_ERR(res.label);
4769                 goto out;
4770         }
4771
4772         nfs4_inode_make_writeable(inode);
4773         nfs4_bitmap_copy_adjust_setattr(bitmask, nfs4_bitmask(server, res.label), inode);
4774
4775         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4776         if (!status) {
4777                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4778                                        NFS_INO_INVALID_DATA);
4779                 status = nfs_post_op_update_inode(inode, res.fattr);
4780                 if (!status)
4781                         nfs_setsecurity(inode, res.fattr, res.label);
4782         }
4783
4784
4785         nfs4_label_free(res.label);
4786
4787 out:
4788         nfs_free_fattr(res.fattr);
4789         return status;
4790 }
4791
4792 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4793 {
4794         struct nfs4_exception exception = {
4795                 .interruptible = true,
4796         };
4797         int err;
4798         do {
4799                 err = nfs4_handle_exception(NFS_SERVER(inode),
4800                                 _nfs4_proc_link(inode, dir, name),
4801                                 &exception);
4802         } while (exception.retry);
4803         return err;
4804 }
4805
4806 struct nfs4_createdata {
4807         struct rpc_message msg;
4808         struct nfs4_create_arg arg;
4809         struct nfs4_create_res res;
4810         struct nfs_fh fh;
4811         struct nfs_fattr fattr;
4812         struct nfs4_label *label;
4813 };
4814
4815 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4816                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4817 {
4818         struct nfs4_createdata *data;
4819
4820         data = kzalloc(sizeof(*data), GFP_KERNEL);
4821         if (data != NULL) {
4822                 struct nfs_server *server = NFS_SERVER(dir);
4823
4824                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4825                 if (IS_ERR(data->label))
4826                         goto out_free;
4827
4828                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4829                 data->msg.rpc_argp = &data->arg;
4830                 data->msg.rpc_resp = &data->res;
4831                 data->arg.dir_fh = NFS_FH(dir);
4832                 data->arg.server = server;
4833                 data->arg.name = name;
4834                 data->arg.attrs = sattr;
4835                 data->arg.ftype = ftype;
4836                 data->arg.bitmask = nfs4_bitmask(server, data->label);
4837                 data->arg.umask = current_umask();
4838                 data->res.server = server;
4839                 data->res.fh = &data->fh;
4840                 data->res.fattr = &data->fattr;
4841                 data->res.label = data->label;
4842                 nfs_fattr_init(data->res.fattr);
4843         }
4844         return data;
4845 out_free:
4846         kfree(data);
4847         return NULL;
4848 }
4849
4850 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4851 {
4852         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4853                                     &data->arg.seq_args, &data->res.seq_res, 1);
4854         if (status == 0) {
4855                 spin_lock(&dir->i_lock);
4856                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
4857                                 data->res.fattr->time_start,
4858                                 NFS_INO_INVALID_DATA);
4859                 /* Creating a directory bumps nlink in the parent */
4860                 if (data->arg.ftype == NF4DIR)
4861                         nfs4_inc_nlink_locked(dir);
4862                 spin_unlock(&dir->i_lock);
4863                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4864         }
4865         return status;
4866 }
4867
4868 static void nfs4_free_createdata(struct nfs4_createdata *data)
4869 {
4870         nfs4_label_free(data->label);
4871         kfree(data);
4872 }
4873
4874 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4875                 struct page *page, unsigned int len, struct iattr *sattr,
4876                 struct nfs4_label *label)
4877 {
4878         struct nfs4_createdata *data;
4879         int status = -ENAMETOOLONG;
4880
4881         if (len > NFS4_MAXPATHLEN)
4882                 goto out;
4883
4884         status = -ENOMEM;
4885         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4886         if (data == NULL)
4887                 goto out;
4888
4889         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4890         data->arg.u.symlink.pages = &page;
4891         data->arg.u.symlink.len = len;
4892         data->arg.label = label;
4893
4894         status = nfs4_do_create(dir, dentry, data);
4895
4896         nfs4_free_createdata(data);
4897 out:
4898         return status;
4899 }
4900
4901 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4902                 struct page *page, unsigned int len, struct iattr *sattr)
4903 {
4904         struct nfs4_exception exception = {
4905                 .interruptible = true,
4906         };
4907         struct nfs4_label l, *label = NULL;
4908         int err;
4909
4910         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4911
4912         do {
4913                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4914                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4915                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4916                                 &exception);
4917         } while (exception.retry);
4918
4919         nfs4_label_release_security(label);
4920         return err;
4921 }
4922
4923 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4924                 struct iattr *sattr, struct nfs4_label *label)
4925 {
4926         struct nfs4_createdata *data;
4927         int status = -ENOMEM;
4928
4929         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4930         if (data == NULL)
4931                 goto out;
4932
4933         data->arg.label = label;
4934         status = nfs4_do_create(dir, dentry, data);
4935
4936         nfs4_free_createdata(data);
4937 out:
4938         return status;
4939 }
4940
4941 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4942                 struct iattr *sattr)
4943 {
4944         struct nfs_server *server = NFS_SERVER(dir);
4945         struct nfs4_exception exception = {
4946                 .interruptible = true,
4947         };
4948         struct nfs4_label l, *label = NULL;
4949         int err;
4950
4951         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4952
4953         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4954                 sattr->ia_mode &= ~current_umask();
4955         do {
4956                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4957                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4958                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4959                                 &exception);
4960         } while (exception.retry);
4961         nfs4_label_release_security(label);
4962
4963         return err;
4964 }
4965
4966 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
4967                               struct nfs_readdir_res *nr_res)
4968 {
4969         struct inode            *dir = d_inode(nr_arg->dentry);
4970         struct nfs_server       *server = NFS_SERVER(dir);
4971         struct nfs4_readdir_arg args = {
4972                 .fh = NFS_FH(dir),
4973                 .pages = nr_arg->pages,
4974                 .pgbase = 0,
4975                 .count = nr_arg->page_len,
4976                 .plus = nr_arg->plus,
4977         };
4978         struct nfs4_readdir_res res;
4979         struct rpc_message msg = {
4980                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4981                 .rpc_argp = &args,
4982                 .rpc_resp = &res,
4983                 .rpc_cred = nr_arg->cred,
4984         };
4985         int                     status;
4986
4987         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
4988                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
4989         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
4990                 args.bitmask = server->attr_bitmask_nl;
4991         else
4992                 args.bitmask = server->attr_bitmask;
4993
4994         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
4995         res.pgbase = args.pgbase;
4996         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
4997                         &res.seq_res, 0);
4998         if (status >= 0) {
4999                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5000                 status += args.pgbase;
5001         }
5002
5003         nfs_invalidate_atime(dir);
5004
5005         dprintk("%s: returns %d\n", __func__, status);
5006         return status;
5007 }
5008
5009 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5010                              struct nfs_readdir_res *res)
5011 {
5012         struct nfs4_exception exception = {
5013                 .interruptible = true,
5014         };
5015         int err;
5016         do {
5017                 err = _nfs4_proc_readdir(arg, res);
5018                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5019                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5020                                             err, &exception);
5021         } while (exception.retry);
5022         return err;
5023 }
5024
5025 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5026                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5027 {
5028         struct nfs4_createdata *data;
5029         int mode = sattr->ia_mode;
5030         int status = -ENOMEM;
5031
5032         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5033         if (data == NULL)
5034                 goto out;
5035
5036         if (S_ISFIFO(mode))
5037                 data->arg.ftype = NF4FIFO;
5038         else if (S_ISBLK(mode)) {
5039                 data->arg.ftype = NF4BLK;
5040                 data->arg.u.device.specdata1 = MAJOR(rdev);
5041                 data->arg.u.device.specdata2 = MINOR(rdev);
5042         }
5043         else if (S_ISCHR(mode)) {
5044                 data->arg.ftype = NF4CHR;
5045                 data->arg.u.device.specdata1 = MAJOR(rdev);
5046                 data->arg.u.device.specdata2 = MINOR(rdev);
5047         } else if (!S_ISSOCK(mode)) {
5048                 status = -EINVAL;
5049                 goto out_free;
5050         }
5051
5052         data->arg.label = label;
5053         status = nfs4_do_create(dir, dentry, data);
5054 out_free:
5055         nfs4_free_createdata(data);
5056 out:
5057         return status;
5058 }
5059
5060 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5061                 struct iattr *sattr, dev_t rdev)
5062 {
5063         struct nfs_server *server = NFS_SERVER(dir);
5064         struct nfs4_exception exception = {
5065                 .interruptible = true,
5066         };
5067         struct nfs4_label l, *label = NULL;
5068         int err;
5069
5070         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5071
5072         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5073                 sattr->ia_mode &= ~current_umask();
5074         do {
5075                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5076                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5077                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5078                                 &exception);
5079         } while (exception.retry);
5080
5081         nfs4_label_release_security(label);
5082
5083         return err;
5084 }
5085
5086 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5087                  struct nfs_fsstat *fsstat)
5088 {
5089         struct nfs4_statfs_arg args = {
5090                 .fh = fhandle,
5091                 .bitmask = server->attr_bitmask,
5092         };
5093         struct nfs4_statfs_res res = {
5094                 .fsstat = fsstat,
5095         };
5096         struct rpc_message msg = {
5097                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5098                 .rpc_argp = &args,
5099                 .rpc_resp = &res,
5100         };
5101
5102         nfs_fattr_init(fsstat->fattr);
5103         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5104 }
5105
5106 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5107 {
5108         struct nfs4_exception exception = {
5109                 .interruptible = true,
5110         };
5111         int err;
5112         do {
5113                 err = nfs4_handle_exception(server,
5114                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5115                                 &exception);
5116         } while (exception.retry);
5117         return err;
5118 }
5119
5120 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5121                 struct nfs_fsinfo *fsinfo)
5122 {
5123         struct nfs4_fsinfo_arg args = {
5124                 .fh = fhandle,
5125                 .bitmask = server->attr_bitmask,
5126         };
5127         struct nfs4_fsinfo_res res = {
5128                 .fsinfo = fsinfo,
5129         };
5130         struct rpc_message msg = {
5131                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5132                 .rpc_argp = &args,
5133                 .rpc_resp = &res,
5134         };
5135
5136         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5137 }
5138
5139 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5140 {
5141         struct nfs4_exception exception = {
5142                 .interruptible = true,
5143         };
5144         int err;
5145
5146         do {
5147                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5148                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5149                 if (err == 0) {
5150                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5151                         break;
5152                 }
5153                 err = nfs4_handle_exception(server, err, &exception);
5154         } while (exception.retry);
5155         return err;
5156 }
5157
5158 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5159 {
5160         int error;
5161
5162         nfs_fattr_init(fsinfo->fattr);
5163         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5164         if (error == 0) {
5165                 /* block layout checks this! */
5166                 server->pnfs_blksize = fsinfo->blksize;
5167                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5168         }
5169
5170         return error;
5171 }
5172
5173 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5174                 struct nfs_pathconf *pathconf)
5175 {
5176         struct nfs4_pathconf_arg args = {
5177                 .fh = fhandle,
5178                 .bitmask = server->attr_bitmask,
5179         };
5180         struct nfs4_pathconf_res res = {
5181                 .pathconf = pathconf,
5182         };
5183         struct rpc_message msg = {
5184                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5185                 .rpc_argp = &args,
5186                 .rpc_resp = &res,
5187         };
5188
5189         /* None of the pathconf attributes are mandatory to implement */
5190         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5191                 memset(pathconf, 0, sizeof(*pathconf));
5192                 return 0;
5193         }
5194
5195         nfs_fattr_init(pathconf->fattr);
5196         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5197 }
5198
5199 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5200                 struct nfs_pathconf *pathconf)
5201 {
5202         struct nfs4_exception exception = {
5203                 .interruptible = true,
5204         };
5205         int err;
5206
5207         do {
5208                 err = nfs4_handle_exception(server,
5209                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5210                                 &exception);
5211         } while (exception.retry);
5212         return err;
5213 }
5214
5215 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5216                 const struct nfs_open_context *ctx,
5217                 const struct nfs_lock_context *l_ctx,
5218                 fmode_t fmode)
5219 {
5220         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5221 }
5222 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5223
5224 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5225                 const struct nfs_open_context *ctx,
5226                 const struct nfs_lock_context *l_ctx,
5227                 fmode_t fmode)
5228 {
5229         nfs4_stateid _current_stateid;
5230
5231         /* If the current stateid represents a lost lock, then exit */
5232         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5233                 return true;
5234         return nfs4_stateid_match(stateid, &_current_stateid);
5235 }
5236
5237 static bool nfs4_error_stateid_expired(int err)
5238 {
5239         switch (err) {
5240         case -NFS4ERR_DELEG_REVOKED:
5241         case -NFS4ERR_ADMIN_REVOKED:
5242         case -NFS4ERR_BAD_STATEID:
5243         case -NFS4ERR_STALE_STATEID:
5244         case -NFS4ERR_OLD_STATEID:
5245         case -NFS4ERR_OPENMODE:
5246         case -NFS4ERR_EXPIRED:
5247                 return true;
5248         }
5249         return false;
5250 }
5251
5252 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5253 {
5254         struct nfs_server *server = NFS_SERVER(hdr->inode);
5255
5256         trace_nfs4_read(hdr, task->tk_status);
5257         if (task->tk_status < 0) {
5258                 struct nfs4_exception exception = {
5259                         .inode = hdr->inode,
5260                         .state = hdr->args.context->state,
5261                         .stateid = &hdr->args.stateid,
5262                 };
5263                 task->tk_status = nfs4_async_handle_exception(task,
5264                                 server, task->tk_status, &exception);
5265                 if (exception.retry) {
5266                         rpc_restart_call_prepare(task);
5267                         return -EAGAIN;
5268                 }
5269         }
5270
5271         if (task->tk_status > 0)
5272                 renew_lease(server, hdr->timestamp);
5273         return 0;
5274 }
5275
5276 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5277                 struct nfs_pgio_args *args)
5278 {
5279
5280         if (!nfs4_error_stateid_expired(task->tk_status) ||
5281                 nfs4_stateid_is_current(&args->stateid,
5282                                 args->context,
5283                                 args->lock_context,
5284                                 FMODE_READ))
5285                 return false;
5286         rpc_restart_call_prepare(task);
5287         return true;
5288 }
5289
5290 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5291                                          struct nfs_pgio_header *hdr)
5292 {
5293         struct nfs_server *server = NFS_SERVER(hdr->inode);
5294         struct rpc_message *msg = &task->tk_msg;
5295
5296         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5297             server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5298                 server->caps &= ~NFS_CAP_READ_PLUS;
5299                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5300                 rpc_restart_call_prepare(task);
5301                 return true;
5302         }
5303         return false;
5304 }
5305
5306 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5307 {
5308         dprintk("--> %s\n", __func__);
5309
5310         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5311                 return -EAGAIN;
5312         if (nfs4_read_stateid_changed(task, &hdr->args))
5313                 return -EAGAIN;
5314         if (nfs4_read_plus_not_supported(task, hdr))
5315                 return -EAGAIN;
5316         if (task->tk_status > 0)
5317                 nfs_invalidate_atime(hdr->inode);
5318         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5319                                     nfs4_read_done_cb(task, hdr);
5320 }
5321
5322 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5323 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5324                                     struct rpc_message *msg)
5325 {
5326         /* Note: We don't use READ_PLUS with pNFS yet */
5327         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp)
5328                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5329 }
5330 #else
5331 static void nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5332                                     struct rpc_message *msg)
5333 {
5334 }
5335 #endif /* CONFIG_NFS_V4_2 */
5336
5337 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5338                                  struct rpc_message *msg)
5339 {
5340         hdr->timestamp   = jiffies;
5341         if (!hdr->pgio_done_cb)
5342                 hdr->pgio_done_cb = nfs4_read_done_cb;
5343         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5344         nfs42_read_plus_support(hdr, msg);
5345         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5346 }
5347
5348 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5349                                       struct nfs_pgio_header *hdr)
5350 {
5351         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5352                         &hdr->args.seq_args,
5353                         &hdr->res.seq_res,
5354                         task))
5355                 return 0;
5356         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5357                                 hdr->args.lock_context,
5358                                 hdr->rw_mode) == -EIO)
5359                 return -EIO;
5360         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5361                 return -EIO;
5362         return 0;
5363 }
5364
5365 static int nfs4_write_done_cb(struct rpc_task *task,
5366                               struct nfs_pgio_header *hdr)
5367 {
5368         struct inode *inode = hdr->inode;
5369
5370         trace_nfs4_write(hdr, task->tk_status);
5371         if (task->tk_status < 0) {
5372                 struct nfs4_exception exception = {
5373                         .inode = hdr->inode,
5374                         .state = hdr->args.context->state,
5375                         .stateid = &hdr->args.stateid,
5376                 };
5377                 task->tk_status = nfs4_async_handle_exception(task,
5378                                 NFS_SERVER(inode), task->tk_status,
5379                                 &exception);
5380                 if (exception.retry) {
5381                         rpc_restart_call_prepare(task);
5382                         return -EAGAIN;
5383                 }
5384         }
5385         if (task->tk_status >= 0) {
5386                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5387                 nfs_writeback_update_inode(hdr);
5388         }
5389         return 0;
5390 }
5391
5392 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5393                 struct nfs_pgio_args *args)
5394 {
5395
5396         if (!nfs4_error_stateid_expired(task->tk_status) ||
5397                 nfs4_stateid_is_current(&args->stateid,
5398                                 args->context,
5399                                 args->lock_context,
5400                                 FMODE_WRITE))
5401                 return false;
5402         rpc_restart_call_prepare(task);
5403         return true;
5404 }
5405
5406 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5407 {
5408         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5409                 return -EAGAIN;
5410         if (nfs4_write_stateid_changed(task, &hdr->args))
5411                 return -EAGAIN;
5412         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5413                 nfs4_write_done_cb(task, hdr);
5414 }
5415
5416 static
5417 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5418 {
5419         /* Don't request attributes for pNFS or O_DIRECT writes */
5420         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5421                 return false;
5422         /* Otherwise, request attributes if and only if we don't hold
5423          * a delegation
5424          */
5425         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5426 }
5427
5428 static void nfs4_bitmask_adjust(__u32 *bitmask, struct inode *inode,
5429                                 struct nfs_server *server,
5430                                 struct nfs4_label *label)
5431 {
5432
5433         unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
5434
5435         if ((cache_validity & NFS_INO_INVALID_DATA) ||
5436                 (cache_validity & NFS_INO_REVAL_PAGECACHE) ||
5437                 (cache_validity & NFS_INO_REVAL_FORCED) ||
5438                 (cache_validity & NFS_INO_INVALID_OTHER))
5439                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode);
5440
5441         if (cache_validity & NFS_INO_INVALID_ATIME)
5442                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5443         if (cache_validity & NFS_INO_INVALID_ACCESS)
5444                 bitmask[0] |= FATTR4_WORD1_MODE | FATTR4_WORD1_OWNER |
5445                                 FATTR4_WORD1_OWNER_GROUP;
5446         if (cache_validity & NFS_INO_INVALID_ACL)
5447                 bitmask[0] |= FATTR4_WORD0_ACL;
5448         if (cache_validity & NFS_INO_INVALID_LABEL)
5449                 bitmask[2] |= FATTR4_WORD2_SECURITY_LABEL;
5450         if (cache_validity & NFS_INO_INVALID_CTIME)
5451                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5452         if (cache_validity & NFS_INO_INVALID_MTIME)
5453                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5454         if (cache_validity & NFS_INO_INVALID_SIZE)
5455                 bitmask[0] |= FATTR4_WORD0_SIZE;
5456         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5457                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5458 }
5459
5460 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5461                                   struct rpc_message *msg,
5462                                   struct rpc_clnt **clnt)
5463 {
5464         struct nfs_server *server = NFS_SERVER(hdr->inode);
5465
5466         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5467                 hdr->args.bitmask = NULL;
5468                 hdr->res.fattr = NULL;
5469         } else {
5470                 hdr->args.bitmask = server->cache_consistency_bitmask;
5471                 nfs4_bitmask_adjust(hdr->args.bitmask, hdr->inode, server, NULL);
5472         }
5473
5474         if (!hdr->pgio_done_cb)
5475                 hdr->pgio_done_cb = nfs4_write_done_cb;
5476         hdr->res.server = server;
5477         hdr->timestamp   = jiffies;
5478
5479         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5480         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5481         nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5482 }
5483
5484 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5485 {
5486         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5487                         &data->args.seq_args,
5488                         &data->res.seq_res,
5489                         task);
5490 }
5491
5492 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5493 {
5494         struct inode *inode = data->inode;
5495
5496         trace_nfs4_commit(data, task->tk_status);
5497         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5498                                     NULL, NULL) == -EAGAIN) {
5499                 rpc_restart_call_prepare(task);
5500                 return -EAGAIN;
5501         }
5502         return 0;
5503 }
5504
5505 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5506 {
5507         if (!nfs4_sequence_done(task, &data->res.seq_res))
5508                 return -EAGAIN;
5509         return data->commit_done_cb(task, data);
5510 }
5511
5512 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5513                                    struct rpc_clnt **clnt)
5514 {
5515         struct nfs_server *server = NFS_SERVER(data->inode);
5516
5517         if (data->commit_done_cb == NULL)
5518                 data->commit_done_cb = nfs4_commit_done_cb;
5519         data->res.server = server;
5520         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5521         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5522         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5523 }
5524
5525 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5526                                 struct nfs_commitres *res)
5527 {
5528         struct inode *dst_inode = file_inode(dst);
5529         struct nfs_server *server = NFS_SERVER(dst_inode);
5530         struct rpc_message msg = {
5531                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5532                 .rpc_argp = args,
5533                 .rpc_resp = res,
5534         };
5535
5536         args->fh = NFS_FH(dst_inode);
5537         return nfs4_call_sync(server->client, server, &msg,
5538                         &args->seq_args, &res->seq_res, 1);
5539 }
5540
5541 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5542 {
5543         struct nfs_commitargs args = {
5544                 .offset = offset,
5545                 .count = count,
5546         };
5547         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5548         struct nfs4_exception exception = { };
5549         int status;
5550
5551         do {
5552                 status = _nfs4_proc_commit(dst, &args, res);
5553                 status = nfs4_handle_exception(dst_server, status, &exception);
5554         } while (exception.retry);
5555
5556         return status;
5557 }
5558
5559 struct nfs4_renewdata {
5560         struct nfs_client       *client;
5561         unsigned long           timestamp;
5562 };
5563
5564 /*
5565  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5566  * standalone procedure for queueing an asynchronous RENEW.
5567  */
5568 static void nfs4_renew_release(void *calldata)
5569 {
5570         struct nfs4_renewdata *data = calldata;
5571         struct nfs_client *clp = data->client;
5572
5573         if (refcount_read(&clp->cl_count) > 1)
5574                 nfs4_schedule_state_renewal(clp);
5575         nfs_put_client(clp);
5576         kfree(data);
5577 }
5578
5579 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5580 {
5581         struct nfs4_renewdata *data = calldata;
5582         struct nfs_client *clp = data->client;
5583         unsigned long timestamp = data->timestamp;
5584
5585         trace_nfs4_renew_async(clp, task->tk_status);
5586         switch (task->tk_status) {
5587         case 0:
5588                 break;
5589         case -NFS4ERR_LEASE_MOVED:
5590                 nfs4_schedule_lease_moved_recovery(clp);
5591                 break;
5592         default:
5593                 /* Unless we're shutting down, schedule state recovery! */
5594                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5595                         return;
5596                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5597                         nfs4_schedule_lease_recovery(clp);
5598                         return;
5599                 }
5600                 nfs4_schedule_path_down_recovery(clp);
5601         }
5602         do_renew_lease(clp, timestamp);
5603 }
5604
5605 static const struct rpc_call_ops nfs4_renew_ops = {
5606         .rpc_call_done = nfs4_renew_done,
5607         .rpc_release = nfs4_renew_release,
5608 };
5609
5610 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5611 {
5612         struct rpc_message msg = {
5613                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5614                 .rpc_argp       = clp,
5615                 .rpc_cred       = cred,
5616         };
5617         struct nfs4_renewdata *data;
5618
5619         if (renew_flags == 0)
5620                 return 0;
5621         if (!refcount_inc_not_zero(&clp->cl_count))
5622                 return -EIO;
5623         data = kmalloc(sizeof(*data), GFP_NOFS);
5624         if (data == NULL) {
5625                 nfs_put_client(clp);
5626                 return -ENOMEM;
5627         }
5628         data->client = clp;
5629         data->timestamp = jiffies;
5630         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5631                         &nfs4_renew_ops, data);
5632 }
5633
5634 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5635 {
5636         struct rpc_message msg = {
5637                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5638                 .rpc_argp       = clp,
5639                 .rpc_cred       = cred,
5640         };
5641         unsigned long now = jiffies;
5642         int status;
5643
5644         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5645         if (status < 0)
5646                 return status;
5647         do_renew_lease(clp, now);
5648         return 0;
5649 }
5650
5651 static inline int nfs4_server_supports_acls(struct nfs_server *server)
5652 {
5653         return server->caps & NFS_CAP_ACLS;
5654 }
5655
5656 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5657  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5658  * the stack.
5659  */
5660 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5661
5662 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5663                 struct page **pages)
5664 {
5665         struct page *newpage, **spages;
5666         int rc = 0;
5667         size_t len;
5668         spages = pages;
5669
5670         do {
5671                 len = min_t(size_t, PAGE_SIZE, buflen);
5672                 newpage = alloc_page(GFP_KERNEL);
5673
5674                 if (newpage == NULL)
5675                         goto unwind;
5676                 memcpy(page_address(newpage), buf, len);
5677                 buf += len;
5678                 buflen -= len;
5679                 *pages++ = newpage;
5680                 rc++;
5681         } while (buflen != 0);
5682
5683         return rc;
5684
5685 unwind:
5686         for(; rc > 0; rc--)
5687                 __free_page(spages[rc-1]);
5688         return -ENOMEM;
5689 }
5690
5691 struct nfs4_cached_acl {
5692         int cached;
5693         size_t len;
5694         char data[];
5695 };
5696
5697 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5698 {
5699         struct nfs_inode *nfsi = NFS_I(inode);
5700
5701         spin_lock(&inode->i_lock);
5702         kfree(nfsi->nfs4_acl);
5703         nfsi->nfs4_acl = acl;
5704         spin_unlock(&inode->i_lock);
5705 }
5706
5707 static void nfs4_zap_acl_attr(struct inode *inode)
5708 {
5709         nfs4_set_cached_acl(inode, NULL);
5710 }
5711
5712 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
5713 {
5714         struct nfs_inode *nfsi = NFS_I(inode);
5715         struct nfs4_cached_acl *acl;
5716         int ret = -ENOENT;
5717
5718         spin_lock(&inode->i_lock);
5719         acl = nfsi->nfs4_acl;
5720         if (acl == NULL)
5721                 goto out;
5722         if (buf == NULL) /* user is just asking for length */
5723                 goto out_len;
5724         if (acl->cached == 0)
5725                 goto out;
5726         ret = -ERANGE; /* see getxattr(2) man page */
5727         if (acl->len > buflen)
5728                 goto out;
5729         memcpy(buf, acl->data, acl->len);
5730 out_len:
5731         ret = acl->len;
5732 out:
5733         spin_unlock(&inode->i_lock);
5734         return ret;
5735 }
5736
5737 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
5738 {
5739         struct nfs4_cached_acl *acl;
5740         size_t buflen = sizeof(*acl) + acl_len;
5741
5742         if (buflen <= PAGE_SIZE) {
5743                 acl = kmalloc(buflen, GFP_KERNEL);
5744                 if (acl == NULL)
5745                         goto out;
5746                 acl->cached = 1;
5747                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5748         } else {
5749                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5750                 if (acl == NULL)
5751                         goto out;
5752                 acl->cached = 0;
5753         }
5754         acl->len = acl_len;
5755 out:
5756         nfs4_set_cached_acl(inode, acl);
5757 }
5758
5759 /*
5760  * The getxattr API returns the required buffer length when called with a
5761  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5762  * the required buf.  On a NULL buf, we send a page of data to the server
5763  * guessing that the ACL request can be serviced by a page. If so, we cache
5764  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5765  * the cache. If not so, we throw away the page, and cache the required
5766  * length. The next getxattr call will then produce another round trip to
5767  * the server, this time with the input buf of the required size.
5768  */
5769 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5770 {
5771         struct page **pages;
5772         struct nfs_getaclargs args = {
5773                 .fh = NFS_FH(inode),
5774                 .acl_len = buflen,
5775         };
5776         struct nfs_getaclres res = {
5777                 .acl_len = buflen,
5778         };
5779         struct rpc_message msg = {
5780                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5781                 .rpc_argp = &args,
5782                 .rpc_resp = &res,
5783         };
5784         unsigned int npages;
5785         int ret = -ENOMEM, i;
5786         struct nfs_server *server = NFS_SERVER(inode);
5787
5788         if (buflen == 0)
5789                 buflen = server->rsize;
5790
5791         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5792         pages = kmalloc_array(npages, sizeof(struct page *), GFP_NOFS);
5793         if (!pages)
5794                 return -ENOMEM;
5795
5796         args.acl_pages = pages;
5797
5798         for (i = 0; i < npages; i++) {
5799                 pages[i] = alloc_page(GFP_KERNEL);
5800                 if (!pages[i])
5801                         goto out_free;
5802         }
5803
5804         /* for decoding across pages */
5805         res.acl_scratch = alloc_page(GFP_KERNEL);
5806         if (!res.acl_scratch)
5807                 goto out_free;
5808
5809         args.acl_len = npages * PAGE_SIZE;
5810
5811         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5812                 __func__, buf, buflen, npages, args.acl_len);
5813         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5814                              &msg, &args.seq_args, &res.seq_res, 0);
5815         if (ret)
5816                 goto out_free;
5817
5818         /* Handle the case where the passed-in buffer is too short */
5819         if (res.acl_flags & NFS4_ACL_TRUNC) {
5820                 /* Did the user only issue a request for the acl length? */
5821                 if (buf == NULL)
5822                         goto out_ok;
5823                 ret = -ERANGE;
5824                 goto out_free;
5825         }
5826         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5827         if (buf) {
5828                 if (res.acl_len > buflen) {
5829                         ret = -ERANGE;
5830                         goto out_free;
5831                 }
5832                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5833         }
5834 out_ok:
5835         ret = res.acl_len;
5836 out_free:
5837         for (i = 0; i < npages; i++)
5838                 if (pages[i])
5839                         __free_page(pages[i]);
5840         if (res.acl_scratch)
5841                 __free_page(res.acl_scratch);
5842         kfree(pages);
5843         return ret;
5844 }
5845
5846 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5847 {
5848         struct nfs4_exception exception = {
5849                 .interruptible = true,
5850         };
5851         ssize_t ret;
5852         do {
5853                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5854                 trace_nfs4_get_acl(inode, ret);
5855                 if (ret >= 0)
5856                         break;
5857                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5858         } while (exception.retry);
5859         return ret;
5860 }
5861
5862 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5863 {
5864         struct nfs_server *server = NFS_SERVER(inode);
5865         int ret;
5866
5867         if (!nfs4_server_supports_acls(server))
5868                 return -EOPNOTSUPP;
5869         ret = nfs_revalidate_inode(server, inode);
5870         if (ret < 0)
5871                 return ret;
5872         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5873                 nfs_zap_acl_cache(inode);
5874         ret = nfs4_read_cached_acl(inode, buf, buflen);
5875         if (ret != -ENOENT)
5876                 /* -ENOENT is returned if there is no ACL or if there is an ACL
5877                  * but no cached acl data, just the acl length */
5878                 return ret;
5879         return nfs4_get_acl_uncached(inode, buf, buflen);
5880 }
5881
5882 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5883 {
5884         struct nfs_server *server = NFS_SERVER(inode);
5885         struct page *pages[NFS4ACL_MAXPAGES];
5886         struct nfs_setaclargs arg = {
5887                 .fh             = NFS_FH(inode),
5888                 .acl_pages      = pages,
5889                 .acl_len        = buflen,
5890         };
5891         struct nfs_setaclres res;
5892         struct rpc_message msg = {
5893                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5894                 .rpc_argp       = &arg,
5895                 .rpc_resp       = &res,
5896         };
5897         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5898         int ret, i;
5899
5900         if (!nfs4_server_supports_acls(server))
5901                 return -EOPNOTSUPP;
5902         if (npages > ARRAY_SIZE(pages))
5903                 return -ERANGE;
5904         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5905         if (i < 0)
5906                 return i;
5907         nfs4_inode_make_writeable(inode);
5908         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5909
5910         /*
5911          * Free each page after tx, so the only ref left is
5912          * held by the network stack
5913          */
5914         for (; i > 0; i--)
5915                 put_page(pages[i-1]);
5916
5917         /*
5918          * Acl update can result in inode attribute update.
5919          * so mark the attribute cache invalid.
5920          */
5921         spin_lock(&inode->i_lock);
5922         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE
5923                 | NFS_INO_INVALID_CTIME
5924                 | NFS_INO_REVAL_FORCED;
5925         spin_unlock(&inode->i_lock);
5926         nfs_access_zap_cache(inode);
5927         nfs_zap_acl_cache(inode);
5928         return ret;
5929 }
5930
5931 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5932 {
5933         struct nfs4_exception exception = { };
5934         int err;
5935         do {
5936                 err = __nfs4_proc_set_acl(inode, buf, buflen);
5937                 trace_nfs4_set_acl(inode, err);
5938                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5939                                 &exception);
5940         } while (exception.retry);
5941         return err;
5942 }
5943
5944 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5945 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5946                                         size_t buflen)
5947 {
5948         struct nfs_server *server = NFS_SERVER(inode);
5949         struct nfs_fattr fattr;
5950         struct nfs4_label label = {0, 0, buflen, buf};
5951
5952         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5953         struct nfs4_getattr_arg arg = {
5954                 .fh             = NFS_FH(inode),
5955                 .bitmask        = bitmask,
5956         };
5957         struct nfs4_getattr_res res = {
5958                 .fattr          = &fattr,
5959                 .label          = &label,
5960                 .server         = server,
5961         };
5962         struct rpc_message msg = {
5963                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5964                 .rpc_argp       = &arg,
5965                 .rpc_resp       = &res,
5966         };
5967         int ret;
5968
5969         nfs_fattr_init(&fattr);
5970
5971         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5972         if (ret)
5973                 return ret;
5974         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5975                 return -ENOENT;
5976         return 0;
5977 }
5978
5979 static int nfs4_get_security_label(struct inode *inode, void *buf,
5980                                         size_t buflen)
5981 {
5982         struct nfs4_exception exception = {
5983                 .interruptible = true,
5984         };
5985         int err;
5986
5987         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5988                 return -EOPNOTSUPP;
5989
5990         do {
5991                 err = _nfs4_get_security_label(inode, buf, buflen);
5992                 trace_nfs4_get_security_label(inode, err);
5993                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5994                                 &exception);
5995         } while (exception.retry);
5996         return err;
5997 }
5998
5999 static int _nfs4_do_set_security_label(struct inode *inode,
6000                 struct nfs4_label *ilabel,
6001                 struct nfs_fattr *fattr,
6002                 struct nfs4_label *olabel)
6003 {
6004
6005         struct iattr sattr = {0};
6006         struct nfs_server *server = NFS_SERVER(inode);
6007         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6008         struct nfs_setattrargs arg = {
6009                 .fh             = NFS_FH(inode),
6010                 .iap            = &sattr,
6011                 .server         = server,
6012                 .bitmask        = bitmask,
6013                 .label          = ilabel,
6014         };
6015         struct nfs_setattrres res = {
6016                 .fattr          = fattr,
6017                 .label          = olabel,
6018                 .server         = server,
6019         };
6020         struct rpc_message msg = {
6021                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6022                 .rpc_argp       = &arg,
6023                 .rpc_resp       = &res,
6024         };
6025         int status;
6026
6027         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6028
6029         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6030         if (status)
6031                 dprintk("%s failed: %d\n", __func__, status);
6032
6033         return status;
6034 }
6035
6036 static int nfs4_do_set_security_label(struct inode *inode,
6037                 struct nfs4_label *ilabel,
6038                 struct nfs_fattr *fattr,
6039                 struct nfs4_label *olabel)
6040 {
6041         struct nfs4_exception exception = { };
6042         int err;
6043
6044         do {
6045                 err = _nfs4_do_set_security_label(inode, ilabel,
6046                                 fattr, olabel);
6047                 trace_nfs4_set_security_label(inode, err);
6048                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6049                                 &exception);
6050         } while (exception.retry);
6051         return err;
6052 }
6053
6054 static int
6055 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6056 {
6057         struct nfs4_label ilabel, *olabel = NULL;
6058         struct nfs_fattr fattr;
6059         int status;
6060
6061         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6062                 return -EOPNOTSUPP;
6063
6064         nfs_fattr_init(&fattr);
6065
6066         ilabel.pi = 0;
6067         ilabel.lfs = 0;
6068         ilabel.label = (char *)buf;
6069         ilabel.len = buflen;
6070
6071         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
6072         if (IS_ERR(olabel)) {
6073                 status = -PTR_ERR(olabel);
6074                 goto out;
6075         }
6076
6077         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
6078         if (status == 0)
6079                 nfs_setsecurity(inode, &fattr, olabel);
6080
6081         nfs4_label_free(olabel);
6082 out:
6083         return status;
6084 }
6085 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6086
6087
6088 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6089                                     nfs4_verifier *bootverf)
6090 {
6091         __be32 verf[2];
6092
6093         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6094                 /* An impossible timestamp guarantees this value
6095                  * will never match a generated boot time. */
6096                 verf[0] = cpu_to_be32(U32_MAX);
6097                 verf[1] = cpu_to_be32(U32_MAX);
6098         } else {
6099                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6100                 u64 ns = ktime_to_ns(nn->boot_time);
6101
6102                 verf[0] = cpu_to_be32(ns >> 32);
6103                 verf[1] = cpu_to_be32(ns);
6104         }
6105         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6106 }
6107
6108 static size_t
6109 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6110 {
6111         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6112         struct nfs_netns_client *nn_clp = nn->nfs_client;
6113         const char *id;
6114
6115         buf[0] = '\0';
6116
6117         if (nn_clp) {
6118                 rcu_read_lock();
6119                 id = rcu_dereference(nn_clp->identifier);
6120                 if (id)
6121                         strscpy(buf, id, buflen);
6122                 rcu_read_unlock();
6123         }
6124
6125         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6126                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6127
6128         return strlen(buf);
6129 }
6130
6131 static int
6132 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6133 {
6134         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6135         size_t buflen;
6136         size_t len;
6137         char *str;
6138
6139         if (clp->cl_owner_id != NULL)
6140                 return 0;
6141
6142         rcu_read_lock();
6143         len = 14 +
6144                 strlen(clp->cl_rpcclient->cl_nodename) +
6145                 1 +
6146                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6147                 1;
6148         rcu_read_unlock();
6149
6150         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6151         if (buflen)
6152                 len += buflen + 1;
6153
6154         if (len > NFS4_OPAQUE_LIMIT + 1)
6155                 return -EINVAL;
6156
6157         /*
6158          * Since this string is allocated at mount time, and held until the
6159          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6160          * about a memory-reclaim deadlock.
6161          */
6162         str = kmalloc(len, GFP_KERNEL);
6163         if (!str)
6164                 return -ENOMEM;
6165
6166         rcu_read_lock();
6167         if (buflen)
6168                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6169                           clp->cl_rpcclient->cl_nodename, buf,
6170                           rpc_peeraddr2str(clp->cl_rpcclient,
6171                                            RPC_DISPLAY_ADDR));
6172         else
6173                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6174                           clp->cl_rpcclient->cl_nodename,
6175                           rpc_peeraddr2str(clp->cl_rpcclient,
6176                                            RPC_DISPLAY_ADDR));
6177         rcu_read_unlock();
6178
6179         clp->cl_owner_id = str;
6180         return 0;
6181 }
6182
6183 static int
6184 nfs4_init_uniform_client_string(struct nfs_client *clp)
6185 {
6186         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6187         size_t buflen;
6188         size_t len;
6189         char *str;
6190
6191         if (clp->cl_owner_id != NULL)
6192                 return 0;
6193
6194         len = 10 + 10 + 1 + 10 + 1 +
6195                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6196
6197         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6198         if (buflen)
6199                 len += buflen + 1;
6200
6201         if (len > NFS4_OPAQUE_LIMIT + 1)
6202                 return -EINVAL;
6203
6204         /*
6205          * Since this string is allocated at mount time, and held until the
6206          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6207          * about a memory-reclaim deadlock.
6208          */
6209         str = kmalloc(len, GFP_KERNEL);
6210         if (!str)
6211                 return -ENOMEM;
6212
6213         if (buflen)
6214                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6215                           clp->rpc_ops->version, clp->cl_minorversion,
6216                           buf, clp->cl_rpcclient->cl_nodename);
6217         else
6218                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6219                           clp->rpc_ops->version, clp->cl_minorversion,
6220                           clp->cl_rpcclient->cl_nodename);
6221         clp->cl_owner_id = str;
6222         return 0;
6223 }
6224
6225 /*
6226  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6227  * services.  Advertise one based on the address family of the
6228  * clientaddr.
6229  */
6230 static unsigned int
6231 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6232 {
6233         if (strchr(clp->cl_ipaddr, ':') != NULL)
6234                 return scnprintf(buf, len, "tcp6");
6235         else
6236                 return scnprintf(buf, len, "tcp");
6237 }
6238
6239 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6240 {
6241         struct nfs4_setclientid *sc = calldata;
6242
6243         if (task->tk_status == 0)
6244                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6245 }
6246
6247 static const struct rpc_call_ops nfs4_setclientid_ops = {
6248         .rpc_call_done = nfs4_setclientid_done,
6249 };
6250
6251 /**
6252  * nfs4_proc_setclientid - Negotiate client ID
6253  * @clp: state data structure
6254  * @program: RPC program for NFSv4 callback service
6255  * @port: IP port number for NFS4 callback service
6256  * @cred: credential to use for this call
6257  * @res: where to place the result
6258  *
6259  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6260  */
6261 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6262                 unsigned short port, const struct cred *cred,
6263                 struct nfs4_setclientid_res *res)
6264 {
6265         nfs4_verifier sc_verifier;
6266         struct nfs4_setclientid setclientid = {
6267                 .sc_verifier = &sc_verifier,
6268                 .sc_prog = program,
6269                 .sc_clnt = clp,
6270         };
6271         struct rpc_message msg = {
6272                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6273                 .rpc_argp = &setclientid,
6274                 .rpc_resp = res,
6275                 .rpc_cred = cred,
6276         };
6277         struct rpc_task_setup task_setup_data = {
6278                 .rpc_client = clp->cl_rpcclient,
6279                 .rpc_message = &msg,
6280                 .callback_ops = &nfs4_setclientid_ops,
6281                 .callback_data = &setclientid,
6282                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6283         };
6284         unsigned long now = jiffies;
6285         int status;
6286
6287         /* nfs_client_id4 */
6288         nfs4_init_boot_verifier(clp, &sc_verifier);
6289
6290         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6291                 status = nfs4_init_uniform_client_string(clp);
6292         else
6293                 status = nfs4_init_nonuniform_client_string(clp);
6294
6295         if (status)
6296                 goto out;
6297
6298         /* cb_client4 */
6299         setclientid.sc_netid_len =
6300                                 nfs4_init_callback_netid(clp,
6301                                                 setclientid.sc_netid,
6302                                                 sizeof(setclientid.sc_netid));
6303         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6304                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6305                                 clp->cl_ipaddr, port >> 8, port & 255);
6306
6307         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6308                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6309                 clp->cl_owner_id);
6310
6311         status = nfs4_call_sync_custom(&task_setup_data);
6312         if (setclientid.sc_cred) {
6313                 kfree(clp->cl_acceptor);
6314                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6315                 put_rpccred(setclientid.sc_cred);
6316         }
6317
6318         if (status == 0)
6319                 do_renew_lease(clp, now);
6320 out:
6321         trace_nfs4_setclientid(clp, status);
6322         dprintk("NFS reply setclientid: %d\n", status);
6323         return status;
6324 }
6325
6326 /**
6327  * nfs4_proc_setclientid_confirm - Confirm client ID
6328  * @clp: state data structure
6329  * @arg: result of a previous SETCLIENTID
6330  * @cred: credential to use for this call
6331  *
6332  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6333  */
6334 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6335                 struct nfs4_setclientid_res *arg,
6336                 const struct cred *cred)
6337 {
6338         struct rpc_message msg = {
6339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6340                 .rpc_argp = arg,
6341                 .rpc_cred = cred,
6342         };
6343         int status;
6344
6345         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6346                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6347                 clp->cl_clientid);
6348         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6349                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6350         trace_nfs4_setclientid_confirm(clp, status);
6351         dprintk("NFS reply setclientid_confirm: %d\n", status);
6352         return status;
6353 }
6354
6355 struct nfs4_delegreturndata {
6356         struct nfs4_delegreturnargs args;
6357         struct nfs4_delegreturnres res;
6358         struct nfs_fh fh;
6359         nfs4_stateid stateid;
6360         unsigned long timestamp;
6361         struct {
6362                 struct nfs4_layoutreturn_args arg;
6363                 struct nfs4_layoutreturn_res res;
6364                 struct nfs4_xdr_opaque_data ld_private;
6365                 u32 roc_barrier;
6366                 bool roc;
6367         } lr;
6368         struct nfs_fattr fattr;
6369         int rpc_status;
6370         struct inode *inode;
6371 };
6372
6373 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6374 {
6375         struct nfs4_delegreturndata *data = calldata;
6376         struct nfs4_exception exception = {
6377                 .inode = data->inode,
6378                 .stateid = &data->stateid,
6379         };
6380
6381         if (!nfs4_sequence_done(task, &data->res.seq_res))
6382                 return;
6383
6384         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6385
6386         /* Handle Layoutreturn errors */
6387         if (pnfs_roc_done(task, data->inode,
6388                                 &data->args.lr_args,
6389                                 &data->res.lr_res,
6390                                 &data->res.lr_ret) == -EAGAIN)
6391                 goto out_restart;
6392
6393         switch (task->tk_status) {
6394         case 0:
6395                 renew_lease(data->res.server, data->timestamp);
6396                 break;
6397         case -NFS4ERR_ADMIN_REVOKED:
6398         case -NFS4ERR_DELEG_REVOKED:
6399         case -NFS4ERR_EXPIRED:
6400                 nfs4_free_revoked_stateid(data->res.server,
6401                                 data->args.stateid,
6402                                 task->tk_msg.rpc_cred);
6403                 fallthrough;
6404         case -NFS4ERR_BAD_STATEID:
6405         case -NFS4ERR_STALE_STATEID:
6406         case -ETIMEDOUT:
6407                 task->tk_status = 0;
6408                 break;
6409         case -NFS4ERR_OLD_STATEID:
6410                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6411                         nfs4_stateid_seqid_inc(&data->stateid);
6412                 if (data->args.bitmask) {
6413                         data->args.bitmask = NULL;
6414                         data->res.fattr = NULL;
6415                 }
6416                 goto out_restart;
6417         case -NFS4ERR_ACCESS:
6418                 if (data->args.bitmask) {
6419                         data->args.bitmask = NULL;
6420                         data->res.fattr = NULL;
6421                         goto out_restart;
6422                 }
6423                 fallthrough;
6424         default:
6425                 task->tk_status = nfs4_async_handle_exception(task,
6426                                 data->res.server, task->tk_status,
6427                                 &exception);
6428                 if (exception.retry)
6429                         goto out_restart;
6430         }
6431         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6432         data->rpc_status = task->tk_status;
6433         return;
6434 out_restart:
6435         task->tk_status = 0;
6436         rpc_restart_call_prepare(task);
6437 }
6438
6439 static void nfs4_delegreturn_release(void *calldata)
6440 {
6441         struct nfs4_delegreturndata *data = calldata;
6442         struct inode *inode = data->inode;
6443
6444         if (inode) {
6445                 if (data->lr.roc)
6446                         pnfs_roc_release(&data->lr.arg, &data->lr.res,
6447                                         data->res.lr_ret);
6448                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
6449                 nfs_iput_and_deactive(inode);
6450         }
6451         kfree(calldata);
6452 }
6453
6454 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6455 {
6456         struct nfs4_delegreturndata *d_data;
6457         struct pnfs_layout_hdr *lo;
6458
6459         d_data = (struct nfs4_delegreturndata *)data;
6460
6461         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6462                 nfs4_sequence_done(task, &d_data->res.seq_res);
6463                 return;
6464         }
6465
6466         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6467         if (lo && !pnfs_layout_is_valid(lo)) {
6468                 d_data->args.lr_args = NULL;
6469                 d_data->res.lr_res = NULL;
6470         }
6471
6472         nfs4_setup_sequence(d_data->res.server->nfs_client,
6473                         &d_data->args.seq_args,
6474                         &d_data->res.seq_res,
6475                         task);
6476 }
6477
6478 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6479         .rpc_call_prepare = nfs4_delegreturn_prepare,
6480         .rpc_call_done = nfs4_delegreturn_done,
6481         .rpc_release = nfs4_delegreturn_release,
6482 };
6483
6484 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6485 {
6486         struct nfs4_delegreturndata *data;
6487         struct nfs_server *server = NFS_SERVER(inode);
6488         struct rpc_task *task;
6489         struct rpc_message msg = {
6490                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6491                 .rpc_cred = cred,
6492         };
6493         struct rpc_task_setup task_setup_data = {
6494                 .rpc_client = server->client,
6495                 .rpc_message = &msg,
6496                 .callback_ops = &nfs4_delegreturn_ops,
6497                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6498         };
6499         int status = 0;
6500
6501         data = kzalloc(sizeof(*data), GFP_NOFS);
6502         if (data == NULL)
6503                 return -ENOMEM;
6504         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
6505
6506         nfs4_state_protect(server->nfs_client,
6507                         NFS_SP4_MACH_CRED_CLEANUP,
6508                         &task_setup_data.rpc_client, &msg);
6509
6510         data->args.fhandle = &data->fh;
6511         data->args.stateid = &data->stateid;
6512         data->args.bitmask = server->cache_consistency_bitmask;
6513         nfs4_bitmask_adjust(data->args.bitmask, inode, server, NULL);
6514         nfs_copy_fh(&data->fh, NFS_FH(inode));
6515         nfs4_stateid_copy(&data->stateid, stateid);
6516         data->res.fattr = &data->fattr;
6517         data->res.server = server;
6518         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6519         data->lr.arg.ld_private = &data->lr.ld_private;
6520         nfs_fattr_init(data->res.fattr);
6521         data->timestamp = jiffies;
6522         data->rpc_status = 0;
6523         data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred);
6524         data->inode = nfs_igrab_and_active(inode);
6525         if (data->inode) {
6526                 if (data->lr.roc) {
6527                         data->args.lr_args = &data->lr.arg;
6528                         data->res.lr_res = &data->lr.res;
6529                 }
6530         } else if (data->lr.roc) {
6531                 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0);
6532                 data->lr.roc = false;
6533         }
6534
6535         task_setup_data.callback_data = data;
6536         msg.rpc_argp = &data->args;
6537         msg.rpc_resp = &data->res;
6538         task = rpc_run_task(&task_setup_data);
6539         if (IS_ERR(task))
6540                 return PTR_ERR(task);
6541         if (!issync)
6542                 goto out;
6543         status = rpc_wait_for_completion_task(task);
6544         if (status != 0)
6545                 goto out;
6546         status = data->rpc_status;
6547 out:
6548         rpc_put_task(task);
6549         return status;
6550 }
6551
6552 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6553 {
6554         struct nfs_server *server = NFS_SERVER(inode);
6555         struct nfs4_exception exception = { };
6556         int err;
6557         do {
6558                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6559                 trace_nfs4_delegreturn(inode, stateid, err);
6560                 switch (err) {
6561                         case -NFS4ERR_STALE_STATEID:
6562                         case -NFS4ERR_EXPIRED:
6563                         case 0:
6564                                 return 0;
6565                 }
6566                 err = nfs4_handle_exception(server, err, &exception);
6567         } while (exception.retry);
6568         return err;
6569 }
6570
6571 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6572 {
6573         struct inode *inode = state->inode;
6574         struct nfs_server *server = NFS_SERVER(inode);
6575         struct nfs_client *clp = server->nfs_client;
6576         struct nfs_lockt_args arg = {
6577                 .fh = NFS_FH(inode),
6578                 .fl = request,
6579         };
6580         struct nfs_lockt_res res = {
6581                 .denied = request,
6582         };
6583         struct rpc_message msg = {
6584                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6585                 .rpc_argp       = &arg,
6586                 .rpc_resp       = &res,
6587                 .rpc_cred       = state->owner->so_cred,
6588         };
6589         struct nfs4_lock_state *lsp;
6590         int status;
6591
6592         arg.lock_owner.clientid = clp->cl_clientid;
6593         status = nfs4_set_lock_state(state, request);
6594         if (status != 0)
6595                 goto out;
6596         lsp = request->fl_u.nfs4_fl.owner;
6597         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6598         arg.lock_owner.s_dev = server->s_dev;
6599         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6600         switch (status) {
6601                 case 0:
6602                         request->fl_type = F_UNLCK;
6603                         break;
6604                 case -NFS4ERR_DENIED:
6605                         status = 0;
6606         }
6607         request->fl_ops->fl_release_private(request);
6608         request->fl_ops = NULL;
6609 out:
6610         return status;
6611 }
6612
6613 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6614 {
6615         struct nfs4_exception exception = {
6616                 .interruptible = true,
6617         };
6618         int err;
6619
6620         do {
6621                 err = _nfs4_proc_getlk(state, cmd, request);
6622                 trace_nfs4_get_lock(request, state, cmd, err);
6623                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6624                                 &exception);
6625         } while (exception.retry);
6626         return err;
6627 }
6628
6629 /*
6630  * Update the seqid of a lock stateid after receiving
6631  * NFS4ERR_OLD_STATEID
6632  */
6633 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6634                 struct nfs4_lock_state *lsp)
6635 {
6636         struct nfs4_state *state = lsp->ls_state;
6637         bool ret = false;
6638
6639         spin_lock(&state->state_lock);
6640         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6641                 goto out;
6642         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6643                 nfs4_stateid_seqid_inc(dst);
6644         else
6645                 dst->seqid = lsp->ls_stateid.seqid;
6646         ret = true;
6647 out:
6648         spin_unlock(&state->state_lock);
6649         return ret;
6650 }
6651
6652 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6653                 struct nfs4_lock_state *lsp)
6654 {
6655         struct nfs4_state *state = lsp->ls_state;
6656         bool ret;
6657
6658         spin_lock(&state->state_lock);
6659         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6660         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6661         spin_unlock(&state->state_lock);
6662         return ret;
6663 }
6664
6665 struct nfs4_unlockdata {
6666         struct nfs_locku_args arg;
6667         struct nfs_locku_res res;
6668         struct nfs4_lock_state *lsp;
6669         struct nfs_open_context *ctx;
6670         struct nfs_lock_context *l_ctx;
6671         struct file_lock fl;
6672         struct nfs_server *server;
6673         unsigned long timestamp;
6674 };
6675
6676 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6677                 struct nfs_open_context *ctx,
6678                 struct nfs4_lock_state *lsp,
6679                 struct nfs_seqid *seqid)
6680 {
6681         struct nfs4_unlockdata *p;
6682         struct nfs4_state *state = lsp->ls_state;
6683         struct inode *inode = state->inode;
6684
6685         p = kzalloc(sizeof(*p), GFP_NOFS);
6686         if (p == NULL)
6687                 return NULL;
6688         p->arg.fh = NFS_FH(inode);
6689         p->arg.fl = &p->fl;
6690         p->arg.seqid = seqid;
6691         p->res.seqid = seqid;
6692         p->lsp = lsp;
6693         /* Ensure we don't close file until we're done freeing locks! */
6694         p->ctx = get_nfs_open_context(ctx);
6695         p->l_ctx = nfs_get_lock_context(ctx);
6696         locks_init_lock(&p->fl);
6697         locks_copy_lock(&p->fl, fl);
6698         p->server = NFS_SERVER(inode);
6699         spin_lock(&state->state_lock);
6700         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6701         spin_unlock(&state->state_lock);
6702         return p;
6703 }
6704
6705 static void nfs4_locku_release_calldata(void *data)
6706 {
6707         struct nfs4_unlockdata *calldata = data;
6708         nfs_free_seqid(calldata->arg.seqid);
6709         nfs4_put_lock_state(calldata->lsp);
6710         nfs_put_lock_context(calldata->l_ctx);
6711         put_nfs_open_context(calldata->ctx);
6712         kfree(calldata);
6713 }
6714
6715 static void nfs4_locku_done(struct rpc_task *task, void *data)
6716 {
6717         struct nfs4_unlockdata *calldata = data;
6718         struct nfs4_exception exception = {
6719                 .inode = calldata->lsp->ls_state->inode,
6720                 .stateid = &calldata->arg.stateid,
6721         };
6722
6723         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6724                 return;
6725         switch (task->tk_status) {
6726                 case 0:
6727                         renew_lease(calldata->server, calldata->timestamp);
6728                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6729                         if (nfs4_update_lock_stateid(calldata->lsp,
6730                                         &calldata->res.stateid))
6731                                 break;
6732                         fallthrough;
6733                 case -NFS4ERR_ADMIN_REVOKED:
6734                 case -NFS4ERR_EXPIRED:
6735                         nfs4_free_revoked_stateid(calldata->server,
6736                                         &calldata->arg.stateid,
6737                                         task->tk_msg.rpc_cred);
6738                         fallthrough;
6739                 case -NFS4ERR_BAD_STATEID:
6740                 case -NFS4ERR_STALE_STATEID:
6741                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6742                                                 calldata->lsp))
6743                                 rpc_restart_call_prepare(task);
6744                         break;
6745                 case -NFS4ERR_OLD_STATEID:
6746                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6747                                                 calldata->lsp))
6748                                 rpc_restart_call_prepare(task);
6749                         break;
6750                 default:
6751                         task->tk_status = nfs4_async_handle_exception(task,
6752                                         calldata->server, task->tk_status,
6753                                         &exception);
6754                         if (exception.retry)
6755                                 rpc_restart_call_prepare(task);
6756         }
6757         nfs_release_seqid(calldata->arg.seqid);
6758 }
6759
6760 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6761 {
6762         struct nfs4_unlockdata *calldata = data;
6763
6764         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6765                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6766                 return;
6767
6768         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6769                 goto out_wait;
6770         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6771                 /* Note: exit _without_ running nfs4_locku_done */
6772                 goto out_no_action;
6773         }
6774         calldata->timestamp = jiffies;
6775         if (nfs4_setup_sequence(calldata->server->nfs_client,
6776                                 &calldata->arg.seq_args,
6777                                 &calldata->res.seq_res,
6778                                 task) != 0)
6779                 nfs_release_seqid(calldata->arg.seqid);
6780         return;
6781 out_no_action:
6782         task->tk_action = NULL;
6783 out_wait:
6784         nfs4_sequence_done(task, &calldata->res.seq_res);
6785 }
6786
6787 static const struct rpc_call_ops nfs4_locku_ops = {
6788         .rpc_call_prepare = nfs4_locku_prepare,
6789         .rpc_call_done = nfs4_locku_done,
6790         .rpc_release = nfs4_locku_release_calldata,
6791 };
6792
6793 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6794                 struct nfs_open_context *ctx,
6795                 struct nfs4_lock_state *lsp,
6796                 struct nfs_seqid *seqid)
6797 {
6798         struct nfs4_unlockdata *data;
6799         struct rpc_message msg = {
6800                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6801                 .rpc_cred = ctx->cred,
6802         };
6803         struct rpc_task_setup task_setup_data = {
6804                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6805                 .rpc_message = &msg,
6806                 .callback_ops = &nfs4_locku_ops,
6807                 .workqueue = nfsiod_workqueue,
6808                 .flags = RPC_TASK_ASYNC,
6809         };
6810
6811         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6812                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6813
6814         /* Ensure this is an unlock - when canceling a lock, the
6815          * canceled lock is passed in, and it won't be an unlock.
6816          */
6817         fl->fl_type = F_UNLCK;
6818         if (fl->fl_flags & FL_CLOSE)
6819                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6820
6821         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6822         if (data == NULL) {
6823                 nfs_free_seqid(seqid);
6824                 return ERR_PTR(-ENOMEM);
6825         }
6826
6827         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6828         msg.rpc_argp = &data->arg;
6829         msg.rpc_resp = &data->res;
6830         task_setup_data.callback_data = data;
6831         return rpc_run_task(&task_setup_data);
6832 }
6833
6834 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6835 {
6836         struct inode *inode = state->inode;
6837         struct nfs4_state_owner *sp = state->owner;
6838         struct nfs_inode *nfsi = NFS_I(inode);
6839         struct nfs_seqid *seqid;
6840         struct nfs4_lock_state *lsp;
6841         struct rpc_task *task;
6842         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6843         int status = 0;
6844         unsigned char fl_flags = request->fl_flags;
6845
6846         status = nfs4_set_lock_state(state, request);
6847         /* Unlock _before_ we do the RPC call */
6848         request->fl_flags |= FL_EXISTS;
6849         /* Exclude nfs_delegation_claim_locks() */
6850         mutex_lock(&sp->so_delegreturn_mutex);
6851         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
6852         down_read(&nfsi->rwsem);
6853         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
6854                 up_read(&nfsi->rwsem);
6855                 mutex_unlock(&sp->so_delegreturn_mutex);
6856                 goto out;
6857         }
6858         up_read(&nfsi->rwsem);
6859         mutex_unlock(&sp->so_delegreturn_mutex);
6860         if (status != 0)
6861                 goto out;
6862         /* Is this a delegated lock? */
6863         lsp = request->fl_u.nfs4_fl.owner;
6864         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
6865                 goto out;
6866         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
6867         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
6868         status = -ENOMEM;
6869         if (IS_ERR(seqid))
6870                 goto out;
6871         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
6872         status = PTR_ERR(task);
6873         if (IS_ERR(task))
6874                 goto out;
6875         status = rpc_wait_for_completion_task(task);
6876         rpc_put_task(task);
6877 out:
6878         request->fl_flags = fl_flags;
6879         trace_nfs4_unlock(request, state, F_SETLK, status);
6880         return status;
6881 }
6882
6883 struct nfs4_lockdata {
6884         struct nfs_lock_args arg;
6885         struct nfs_lock_res res;
6886         struct nfs4_lock_state *lsp;
6887         struct nfs_open_context *ctx;
6888         struct file_lock fl;
6889         unsigned long timestamp;
6890         int rpc_status;
6891         int cancelled;
6892         struct nfs_server *server;
6893 };
6894
6895 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
6896                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
6897                 gfp_t gfp_mask)
6898 {
6899         struct nfs4_lockdata *p;
6900         struct inode *inode = lsp->ls_state->inode;
6901         struct nfs_server *server = NFS_SERVER(inode);
6902         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6903
6904         p = kzalloc(sizeof(*p), gfp_mask);
6905         if (p == NULL)
6906                 return NULL;
6907
6908         p->arg.fh = NFS_FH(inode);
6909         p->arg.fl = &p->fl;
6910         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
6911         if (IS_ERR(p->arg.open_seqid))
6912                 goto out_free;
6913         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
6914         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
6915         if (IS_ERR(p->arg.lock_seqid))
6916                 goto out_free_seqid;
6917         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
6918         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
6919         p->arg.lock_owner.s_dev = server->s_dev;
6920         p->res.lock_seqid = p->arg.lock_seqid;
6921         p->lsp = lsp;
6922         p->server = server;
6923         p->ctx = get_nfs_open_context(ctx);
6924         locks_init_lock(&p->fl);
6925         locks_copy_lock(&p->fl, fl);
6926         return p;
6927 out_free_seqid:
6928         nfs_free_seqid(p->arg.open_seqid);
6929 out_free:
6930         kfree(p);
6931         return NULL;
6932 }
6933
6934 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
6935 {
6936         struct nfs4_lockdata *data = calldata;
6937         struct nfs4_state *state = data->lsp->ls_state;
6938
6939         dprintk("%s: begin!\n", __func__);
6940         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
6941                 goto out_wait;
6942         /* Do we need to do an open_to_lock_owner? */
6943         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
6944                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
6945                         goto out_release_lock_seqid;
6946                 }
6947                 nfs4_stateid_copy(&data->arg.open_stateid,
6948                                 &state->open_stateid);
6949                 data->arg.new_lock_owner = 1;
6950                 data->res.open_seqid = data->arg.open_seqid;
6951         } else {
6952                 data->arg.new_lock_owner = 0;
6953                 nfs4_stateid_copy(&data->arg.lock_stateid,
6954                                 &data->lsp->ls_stateid);
6955         }
6956         if (!nfs4_valid_open_stateid(state)) {
6957                 data->rpc_status = -EBADF;
6958                 task->tk_action = NULL;
6959                 goto out_release_open_seqid;
6960         }
6961         data->timestamp = jiffies;
6962         if (nfs4_setup_sequence(data->server->nfs_client,
6963                                 &data->arg.seq_args,
6964                                 &data->res.seq_res,
6965                                 task) == 0)
6966                 return;
6967 out_release_open_seqid:
6968         nfs_release_seqid(data->arg.open_seqid);
6969 out_release_lock_seqid:
6970         nfs_release_seqid(data->arg.lock_seqid);
6971 out_wait:
6972         nfs4_sequence_done(task, &data->res.seq_res);
6973         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
6974 }
6975
6976 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
6977 {
6978         struct nfs4_lockdata *data = calldata;
6979         struct nfs4_lock_state *lsp = data->lsp;
6980
6981         dprintk("%s: begin!\n", __func__);
6982
6983         if (!nfs4_sequence_done(task, &data->res.seq_res))
6984                 return;
6985
6986         data->rpc_status = task->tk_status;
6987         switch (task->tk_status) {
6988         case 0:
6989                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
6990                                 data->timestamp);
6991                 if (data->arg.new_lock && !data->cancelled) {
6992                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
6993                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
6994                                 goto out_restart;
6995                 }
6996                 if (data->arg.new_lock_owner != 0) {
6997                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
6998                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
6999                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7000                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7001                         goto out_restart;
7002                 break;
7003         case -NFS4ERR_BAD_STATEID:
7004         case -NFS4ERR_OLD_STATEID:
7005         case -NFS4ERR_STALE_STATEID:
7006         case -NFS4ERR_EXPIRED:
7007                 if (data->arg.new_lock_owner != 0) {
7008                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7009                                                 &lsp->ls_state->open_stateid))
7010                                 goto out_restart;
7011                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7012                                                 &lsp->ls_stateid))
7013                                 goto out_restart;
7014         }
7015 out_done:
7016         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
7017         return;
7018 out_restart:
7019         if (!data->cancelled)
7020                 rpc_restart_call_prepare(task);
7021         goto out_done;
7022 }
7023
7024 static void nfs4_lock_release(void *calldata)
7025 {
7026         struct nfs4_lockdata *data = calldata;
7027
7028         dprintk("%s: begin!\n", __func__);
7029         nfs_free_seqid(data->arg.open_seqid);
7030         if (data->cancelled && data->rpc_status == 0) {
7031                 struct rpc_task *task;
7032                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7033                                 data->arg.lock_seqid);
7034                 if (!IS_ERR(task))
7035                         rpc_put_task_async(task);
7036                 dprintk("%s: cancelling lock!\n", __func__);
7037         } else
7038                 nfs_free_seqid(data->arg.lock_seqid);
7039         nfs4_put_lock_state(data->lsp);
7040         put_nfs_open_context(data->ctx);
7041         kfree(data);
7042         dprintk("%s: done!\n", __func__);
7043 }
7044
7045 static const struct rpc_call_ops nfs4_lock_ops = {
7046         .rpc_call_prepare = nfs4_lock_prepare,
7047         .rpc_call_done = nfs4_lock_done,
7048         .rpc_release = nfs4_lock_release,
7049 };
7050
7051 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7052 {
7053         switch (error) {
7054         case -NFS4ERR_ADMIN_REVOKED:
7055         case -NFS4ERR_EXPIRED:
7056         case -NFS4ERR_BAD_STATEID:
7057                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7058                 if (new_lock_owner != 0 ||
7059                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7060                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7061                 break;
7062         case -NFS4ERR_STALE_STATEID:
7063                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7064                 nfs4_schedule_lease_recovery(server->nfs_client);
7065         }
7066 }
7067
7068 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7069 {
7070         struct nfs4_lockdata *data;
7071         struct rpc_task *task;
7072         struct rpc_message msg = {
7073                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7074                 .rpc_cred = state->owner->so_cred,
7075         };
7076         struct rpc_task_setup task_setup_data = {
7077                 .rpc_client = NFS_CLIENT(state->inode),
7078                 .rpc_message = &msg,
7079                 .callback_ops = &nfs4_lock_ops,
7080                 .workqueue = nfsiod_workqueue,
7081                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7082         };
7083         int ret;
7084
7085         dprintk("%s: begin!\n", __func__);
7086         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7087                         fl->fl_u.nfs4_fl.owner,
7088                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
7089         if (data == NULL)
7090                 return -ENOMEM;
7091         if (IS_SETLKW(cmd))
7092                 data->arg.block = 1;
7093         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7094                                 recovery_type > NFS_LOCK_NEW);
7095         msg.rpc_argp = &data->arg;
7096         msg.rpc_resp = &data->res;
7097         task_setup_data.callback_data = data;
7098         if (recovery_type > NFS_LOCK_NEW) {
7099                 if (recovery_type == NFS_LOCK_RECLAIM)
7100                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7101         } else
7102                 data->arg.new_lock = 1;
7103         task = rpc_run_task(&task_setup_data);
7104         if (IS_ERR(task))
7105                 return PTR_ERR(task);
7106         ret = rpc_wait_for_completion_task(task);
7107         if (ret == 0) {
7108                 ret = data->rpc_status;
7109                 if (ret)
7110                         nfs4_handle_setlk_error(data->server, data->lsp,
7111                                         data->arg.new_lock_owner, ret);
7112         } else
7113                 data->cancelled = true;
7114         rpc_put_task(task);
7115         dprintk("%s: done, ret = %d!\n", __func__, ret);
7116         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7117         return ret;
7118 }
7119
7120 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7121 {
7122         struct nfs_server *server = NFS_SERVER(state->inode);
7123         struct nfs4_exception exception = {
7124                 .inode = state->inode,
7125         };
7126         int err;
7127
7128         do {
7129                 /* Cache the lock if possible... */
7130                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7131                         return 0;
7132                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7133                 if (err != -NFS4ERR_DELAY)
7134                         break;
7135                 nfs4_handle_exception(server, err, &exception);
7136         } while (exception.retry);
7137         return err;
7138 }
7139
7140 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7141 {
7142         struct nfs_server *server = NFS_SERVER(state->inode);
7143         struct nfs4_exception exception = {
7144                 .inode = state->inode,
7145         };
7146         int err;
7147
7148         err = nfs4_set_lock_state(state, request);
7149         if (err != 0)
7150                 return err;
7151         if (!recover_lost_locks) {
7152                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7153                 return 0;
7154         }
7155         do {
7156                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7157                         return 0;
7158                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7159                 switch (err) {
7160                 default:
7161                         goto out;
7162                 case -NFS4ERR_GRACE:
7163                 case -NFS4ERR_DELAY:
7164                         nfs4_handle_exception(server, err, &exception);
7165                         err = 0;
7166                 }
7167         } while (exception.retry);
7168 out:
7169         return err;
7170 }
7171
7172 #if defined(CONFIG_NFS_V4_1)
7173 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7174 {
7175         struct nfs4_lock_state *lsp;
7176         int status;
7177
7178         status = nfs4_set_lock_state(state, request);
7179         if (status != 0)
7180                 return status;
7181         lsp = request->fl_u.nfs4_fl.owner;
7182         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7183             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7184                 return 0;
7185         return nfs4_lock_expired(state, request);
7186 }
7187 #endif
7188
7189 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7190 {
7191         struct nfs_inode *nfsi = NFS_I(state->inode);
7192         struct nfs4_state_owner *sp = state->owner;
7193         unsigned char fl_flags = request->fl_flags;
7194         int status;
7195
7196         request->fl_flags |= FL_ACCESS;
7197         status = locks_lock_inode_wait(state->inode, request);
7198         if (status < 0)
7199                 goto out;
7200         mutex_lock(&sp->so_delegreturn_mutex);
7201         down_read(&nfsi->rwsem);
7202         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7203                 /* Yes: cache locks! */
7204                 /* ...but avoid races with delegation recall... */
7205                 request->fl_flags = fl_flags & ~FL_SLEEP;
7206                 status = locks_lock_inode_wait(state->inode, request);
7207                 up_read(&nfsi->rwsem);
7208                 mutex_unlock(&sp->so_delegreturn_mutex);
7209                 goto out;
7210         }
7211         up_read(&nfsi->rwsem);
7212         mutex_unlock(&sp->so_delegreturn_mutex);
7213         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7214 out:
7215         request->fl_flags = fl_flags;
7216         return status;
7217 }
7218
7219 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7220 {
7221         struct nfs4_exception exception = {
7222                 .state = state,
7223                 .inode = state->inode,
7224                 .interruptible = true,
7225         };
7226         int err;
7227
7228         do {
7229                 err = _nfs4_proc_setlk(state, cmd, request);
7230                 if (err == -NFS4ERR_DENIED)
7231                         err = -EAGAIN;
7232                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7233                                 err, &exception);
7234         } while (exception.retry);
7235         return err;
7236 }
7237
7238 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7239 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7240
7241 static int
7242 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7243                         struct file_lock *request)
7244 {
7245         int             status = -ERESTARTSYS;
7246         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7247
7248         while(!signalled()) {
7249                 status = nfs4_proc_setlk(state, cmd, request);
7250                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7251                         break;
7252                 freezable_schedule_timeout_interruptible(timeout);
7253                 timeout *= 2;
7254                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7255                 status = -ERESTARTSYS;
7256         }
7257         return status;
7258 }
7259
7260 #ifdef CONFIG_NFS_V4_1
7261 struct nfs4_lock_waiter {
7262         struct task_struct      *task;
7263         struct inode            *inode;
7264         struct nfs_lowner       *owner;
7265 };
7266
7267 static int
7268 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7269 {
7270         int ret;
7271         struct nfs4_lock_waiter *waiter = wait->private;
7272
7273         /* NULL key means to wake up everyone */
7274         if (key) {
7275                 struct cb_notify_lock_args      *cbnl = key;
7276                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7277                                                 *wowner = waiter->owner;
7278
7279                 /* Only wake if the callback was for the same owner. */
7280                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7281                         return 0;
7282
7283                 /* Make sure it's for the right inode */
7284                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7285                         return 0;
7286         }
7287
7288         /* override "private" so we can use default_wake_function */
7289         wait->private = waiter->task;
7290         ret = woken_wake_function(wait, mode, flags, key);
7291         if (ret)
7292                 list_del_init(&wait->entry);
7293         wait->private = waiter;
7294         return ret;
7295 }
7296
7297 static int
7298 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7299 {
7300         int status = -ERESTARTSYS;
7301         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7302         struct nfs_server *server = NFS_SERVER(state->inode);
7303         struct nfs_client *clp = server->nfs_client;
7304         wait_queue_head_t *q = &clp->cl_lock_waitq;
7305         struct nfs_lowner owner = { .clientid = clp->cl_clientid,
7306                                     .id = lsp->ls_seqid.owner_id,
7307                                     .s_dev = server->s_dev };
7308         struct nfs4_lock_waiter waiter = { .task  = current,
7309                                            .inode = state->inode,
7310                                            .owner = &owner};
7311         wait_queue_entry_t wait;
7312
7313         /* Don't bother with waitqueue if we don't expect a callback */
7314         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7315                 return nfs4_retry_setlk_simple(state, cmd, request);
7316
7317         init_wait(&wait);
7318         wait.private = &waiter;
7319         wait.func = nfs4_wake_lock_waiter;
7320
7321         while(!signalled()) {
7322                 add_wait_queue(q, &wait);
7323                 status = nfs4_proc_setlk(state, cmd, request);
7324                 if ((status != -EAGAIN) || IS_SETLK(cmd)) {
7325                         finish_wait(q, &wait);
7326                         break;
7327                 }
7328
7329                 status = -ERESTARTSYS;
7330                 freezer_do_not_count();
7331                 wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT);
7332                 freezer_count();
7333                 finish_wait(q, &wait);
7334         }
7335
7336         return status;
7337 }
7338 #else /* !CONFIG_NFS_V4_1 */
7339 static inline int
7340 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7341 {
7342         return nfs4_retry_setlk_simple(state, cmd, request);
7343 }
7344 #endif
7345
7346 static int
7347 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7348 {
7349         struct nfs_open_context *ctx;
7350         struct nfs4_state *state;
7351         int status;
7352
7353         /* verify open state */
7354         ctx = nfs_file_open_context(filp);
7355         state = ctx->state;
7356
7357         if (IS_GETLK(cmd)) {
7358                 if (state != NULL)
7359                         return nfs4_proc_getlk(state, F_GETLK, request);
7360                 return 0;
7361         }
7362
7363         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7364                 return -EINVAL;
7365
7366         if (request->fl_type == F_UNLCK) {
7367                 if (state != NULL)
7368                         return nfs4_proc_unlck(state, cmd, request);
7369                 return 0;
7370         }
7371
7372         if (state == NULL)
7373                 return -ENOLCK;
7374
7375         if ((request->fl_flags & FL_POSIX) &&
7376             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7377                 return -ENOLCK;
7378
7379         /*
7380          * Don't rely on the VFS having checked the file open mode,
7381          * since it won't do this for flock() locks.
7382          */
7383         switch (request->fl_type) {
7384         case F_RDLCK:
7385                 if (!(filp->f_mode & FMODE_READ))
7386                         return -EBADF;
7387                 break;
7388         case F_WRLCK:
7389                 if (!(filp->f_mode & FMODE_WRITE))
7390                         return -EBADF;
7391         }
7392
7393         status = nfs4_set_lock_state(state, request);
7394         if (status != 0)
7395                 return status;
7396
7397         return nfs4_retry_setlk(state, cmd, request);
7398 }
7399
7400 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7401 {
7402         struct nfs_server *server = NFS_SERVER(state->inode);
7403         int err;
7404
7405         err = nfs4_set_lock_state(state, fl);
7406         if (err != 0)
7407                 return err;
7408         do {
7409                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7410                 if (err != -NFS4ERR_DELAY)
7411                         break;
7412                 ssleep(1);
7413         } while (err == -NFS4ERR_DELAY);
7414         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7415 }
7416
7417 struct nfs_release_lockowner_data {
7418         struct nfs4_lock_state *lsp;
7419         struct nfs_server *server;
7420         struct nfs_release_lockowner_args args;
7421         struct nfs_release_lockowner_res res;
7422         unsigned long timestamp;
7423 };
7424
7425 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7426 {
7427         struct nfs_release_lockowner_data *data = calldata;
7428         struct nfs_server *server = data->server;
7429         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7430                            &data->res.seq_res, task);
7431         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7432         data->timestamp = jiffies;
7433 }
7434
7435 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7436 {
7437         struct nfs_release_lockowner_data *data = calldata;
7438         struct nfs_server *server = data->server;
7439
7440         nfs40_sequence_done(task, &data->res.seq_res);
7441
7442         switch (task->tk_status) {
7443         case 0:
7444                 renew_lease(server, data->timestamp);
7445                 break;
7446         case -NFS4ERR_STALE_CLIENTID:
7447         case -NFS4ERR_EXPIRED:
7448                 nfs4_schedule_lease_recovery(server->nfs_client);
7449                 break;
7450         case -NFS4ERR_LEASE_MOVED:
7451         case -NFS4ERR_DELAY:
7452                 if (nfs4_async_handle_error(task, server,
7453                                             NULL, NULL) == -EAGAIN)
7454                         rpc_restart_call_prepare(task);
7455         }
7456 }
7457
7458 static void nfs4_release_lockowner_release(void *calldata)
7459 {
7460         struct nfs_release_lockowner_data *data = calldata;
7461         nfs4_free_lock_state(data->server, data->lsp);
7462         kfree(calldata);
7463 }
7464
7465 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7466         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7467         .rpc_call_done = nfs4_release_lockowner_done,
7468         .rpc_release = nfs4_release_lockowner_release,
7469 };
7470
7471 static void
7472 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7473 {
7474         struct nfs_release_lockowner_data *data;
7475         struct rpc_message msg = {
7476                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7477         };
7478
7479         if (server->nfs_client->cl_mvops->minor_version != 0)
7480                 return;
7481
7482         data = kmalloc(sizeof(*data), GFP_NOFS);
7483         if (!data)
7484                 return;
7485         data->lsp = lsp;
7486         data->server = server;
7487         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7488         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7489         data->args.lock_owner.s_dev = server->s_dev;
7490
7491         msg.rpc_argp = &data->args;
7492         msg.rpc_resp = &data->res;
7493         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7494         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7495 }
7496
7497 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7498
7499 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7500                                    struct dentry *unused, struct inode *inode,
7501                                    const char *key, const void *buf,
7502                                    size_t buflen, int flags)
7503 {
7504         return nfs4_proc_set_acl(inode, buf, buflen);
7505 }
7506
7507 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7508                                    struct dentry *unused, struct inode *inode,
7509                                    const char *key, void *buf, size_t buflen)
7510 {
7511         return nfs4_proc_get_acl(inode, buf, buflen);
7512 }
7513
7514 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7515 {
7516         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
7517 }
7518
7519 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7520
7521 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7522                                      struct dentry *unused, struct inode *inode,
7523                                      const char *key, const void *buf,
7524                                      size_t buflen, int flags)
7525 {
7526         if (security_ismaclabel(key))
7527                 return nfs4_set_security_label(inode, buf, buflen);
7528
7529         return -EOPNOTSUPP;
7530 }
7531
7532 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7533                                      struct dentry *unused, struct inode *inode,
7534                                      const char *key, void *buf, size_t buflen)
7535 {
7536         if (security_ismaclabel(key))
7537                 return nfs4_get_security_label(inode, buf, buflen);
7538         return -EOPNOTSUPP;
7539 }
7540
7541 static ssize_t
7542 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7543 {
7544         int len = 0;
7545
7546         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7547                 len = security_inode_listsecurity(inode, list, list_len);
7548                 if (len >= 0 && list_len && len > list_len)
7549                         return -ERANGE;
7550         }
7551         return len;
7552 }
7553
7554 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7555         .prefix = XATTR_SECURITY_PREFIX,
7556         .get    = nfs4_xattr_get_nfs4_label,
7557         .set    = nfs4_xattr_set_nfs4_label,
7558 };
7559
7560 #else
7561
7562 static ssize_t
7563 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7564 {
7565         return 0;
7566 }
7567
7568 #endif
7569
7570 #ifdef CONFIG_NFS_V4_2
7571 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7572                                     struct dentry *unused, struct inode *inode,
7573                                     const char *key, const void *buf,
7574                                     size_t buflen, int flags)
7575 {
7576         struct nfs_access_entry cache;
7577         int ret;
7578
7579         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7580                 return -EOPNOTSUPP;
7581
7582         /*
7583          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7584          * flags right now. Handling of xattr operations use the normal
7585          * file read/write permissions.
7586          *
7587          * Just in case the server has other ideas (which RFC 8276 allows),
7588          * do a cached access check for the XA* flags to possibly avoid
7589          * doing an RPC and getting EACCES back.
7590          */
7591         if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7592                 if (!(cache.mask & NFS_ACCESS_XAWRITE))
7593                         return -EACCES;
7594         }
7595
7596         if (buf == NULL) {
7597                 ret = nfs42_proc_removexattr(inode, key);
7598                 if (!ret)
7599                         nfs4_xattr_cache_remove(inode, key);
7600         } else {
7601                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7602                 if (!ret)
7603                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7604         }
7605
7606         return ret;
7607 }
7608
7609 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7610                                     struct dentry *unused, struct inode *inode,
7611                                     const char *key, void *buf, size_t buflen)
7612 {
7613         struct nfs_access_entry cache;
7614         ssize_t ret;
7615
7616         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7617                 return -EOPNOTSUPP;
7618
7619         if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7620                 if (!(cache.mask & NFS_ACCESS_XAREAD))
7621                         return -EACCES;
7622         }
7623
7624         ret = nfs_revalidate_inode(NFS_SERVER(inode), inode);
7625         if (ret)
7626                 return ret;
7627
7628         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7629         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7630                 return ret;
7631
7632         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7633
7634         return ret;
7635 }
7636
7637 static ssize_t
7638 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7639 {
7640         u64 cookie;
7641         bool eof;
7642         ssize_t ret, size;
7643         char *buf;
7644         size_t buflen;
7645         struct nfs_access_entry cache;
7646
7647         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7648                 return 0;
7649
7650         if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7651                 if (!(cache.mask & NFS_ACCESS_XALIST))
7652                         return 0;
7653         }
7654
7655         ret = nfs_revalidate_inode(NFS_SERVER(inode), inode);
7656         if (ret)
7657                 return ret;
7658
7659         ret = nfs4_xattr_cache_list(inode, list, list_len);
7660         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7661                 return ret;
7662
7663         cookie = 0;
7664         eof = false;
7665         buflen = list_len ? list_len : XATTR_LIST_MAX;
7666         buf = list_len ? list : NULL;
7667         size = 0;
7668
7669         while (!eof) {
7670                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7671                     &cookie, &eof);
7672                 if (ret < 0)
7673                         return ret;
7674
7675                 if (list_len) {
7676                         buf += ret;
7677                         buflen -= ret;
7678                 }
7679                 size += ret;
7680         }
7681
7682         if (list_len)
7683                 nfs4_xattr_cache_set_list(inode, list, size);
7684
7685         return size;
7686 }
7687
7688 #else
7689
7690 static ssize_t
7691 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7692 {
7693         return 0;
7694 }
7695 #endif /* CONFIG_NFS_V4_2 */
7696
7697 /*
7698  * nfs_fhget will use either the mounted_on_fileid or the fileid
7699  */
7700 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7701 {
7702         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7703                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7704               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7705               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7706                 return;
7707
7708         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7709                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7710         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7711         fattr->nlink = 2;
7712 }
7713
7714 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7715                                    const struct qstr *name,
7716                                    struct nfs4_fs_locations *fs_locations,
7717                                    struct page *page)
7718 {
7719         struct nfs_server *server = NFS_SERVER(dir);
7720         u32 bitmask[3];
7721         struct nfs4_fs_locations_arg args = {
7722                 .dir_fh = NFS_FH(dir),
7723                 .name = name,
7724                 .page = page,
7725                 .bitmask = bitmask,
7726         };
7727         struct nfs4_fs_locations_res res = {
7728                 .fs_locations = fs_locations,
7729         };
7730         struct rpc_message msg = {
7731                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7732                 .rpc_argp = &args,
7733                 .rpc_resp = &res,
7734         };
7735         int status;
7736
7737         dprintk("%s: start\n", __func__);
7738
7739         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7740         bitmask[1] = nfs4_fattr_bitmap[1];
7741
7742         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7743          * is not supported */
7744         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7745                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7746         else
7747                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7748
7749         nfs_fattr_init(&fs_locations->fattr);
7750         fs_locations->server = server;
7751         fs_locations->nlocations = 0;
7752         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7753         dprintk("%s: returned status = %d\n", __func__, status);
7754         return status;
7755 }
7756
7757 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7758                            const struct qstr *name,
7759                            struct nfs4_fs_locations *fs_locations,
7760                            struct page *page)
7761 {
7762         struct nfs4_exception exception = {
7763                 .interruptible = true,
7764         };
7765         int err;
7766         do {
7767                 err = _nfs4_proc_fs_locations(client, dir, name,
7768                                 fs_locations, page);
7769                 trace_nfs4_get_fs_locations(dir, name, err);
7770                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7771                                 &exception);
7772         } while (exception.retry);
7773         return err;
7774 }
7775
7776 /*
7777  * This operation also signals the server that this client is
7778  * performing migration recovery.  The server can stop returning
7779  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
7780  * appended to this compound to identify the client ID which is
7781  * performing recovery.
7782  */
7783 static int _nfs40_proc_get_locations(struct inode *inode,
7784                                      struct nfs4_fs_locations *locations,
7785                                      struct page *page, const struct cred *cred)
7786 {
7787         struct nfs_server *server = NFS_SERVER(inode);
7788         struct rpc_clnt *clnt = server->client;
7789         u32 bitmask[2] = {
7790                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7791         };
7792         struct nfs4_fs_locations_arg args = {
7793                 .clientid       = server->nfs_client->cl_clientid,
7794                 .fh             = NFS_FH(inode),
7795                 .page           = page,
7796                 .bitmask        = bitmask,
7797                 .migration      = 1,            /* skip LOOKUP */
7798                 .renew          = 1,            /* append RENEW */
7799         };
7800         struct nfs4_fs_locations_res res = {
7801                 .fs_locations   = locations,
7802                 .migration      = 1,
7803                 .renew          = 1,
7804         };
7805         struct rpc_message msg = {
7806                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7807                 .rpc_argp       = &args,
7808                 .rpc_resp       = &res,
7809                 .rpc_cred       = cred,
7810         };
7811         unsigned long now = jiffies;
7812         int status;
7813
7814         nfs_fattr_init(&locations->fattr);
7815         locations->server = server;
7816         locations->nlocations = 0;
7817
7818         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7819         status = nfs4_call_sync_sequence(clnt, server, &msg,
7820                                         &args.seq_args, &res.seq_res);
7821         if (status)
7822                 return status;
7823
7824         renew_lease(server, now);
7825         return 0;
7826 }
7827
7828 #ifdef CONFIG_NFS_V4_1
7829
7830 /*
7831  * This operation also signals the server that this client is
7832  * performing migration recovery.  The server can stop asserting
7833  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
7834  * performing this operation is identified in the SEQUENCE
7835  * operation in this compound.
7836  *
7837  * When the client supports GETATTR(fs_locations_info), it can
7838  * be plumbed in here.
7839  */
7840 static int _nfs41_proc_get_locations(struct inode *inode,
7841                                      struct nfs4_fs_locations *locations,
7842                                      struct page *page, const struct cred *cred)
7843 {
7844         struct nfs_server *server = NFS_SERVER(inode);
7845         struct rpc_clnt *clnt = server->client;
7846         u32 bitmask[2] = {
7847                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7848         };
7849         struct nfs4_fs_locations_arg args = {
7850                 .fh             = NFS_FH(inode),
7851                 .page           = page,
7852                 .bitmask        = bitmask,
7853                 .migration      = 1,            /* skip LOOKUP */
7854         };
7855         struct nfs4_fs_locations_res res = {
7856                 .fs_locations   = locations,
7857                 .migration      = 1,
7858         };
7859         struct rpc_message msg = {
7860                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7861                 .rpc_argp       = &args,
7862                 .rpc_resp       = &res,
7863                 .rpc_cred       = cred,
7864         };
7865         int status;
7866
7867         nfs_fattr_init(&locations->fattr);
7868         locations->server = server;
7869         locations->nlocations = 0;
7870
7871         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7872         status = nfs4_call_sync_sequence(clnt, server, &msg,
7873                                         &args.seq_args, &res.seq_res);
7874         if (status == NFS4_OK &&
7875             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7876                 status = -NFS4ERR_LEASE_MOVED;
7877         return status;
7878 }
7879
7880 #endif  /* CONFIG_NFS_V4_1 */
7881
7882 /**
7883  * nfs4_proc_get_locations - discover locations for a migrated FSID
7884  * @inode: inode on FSID that is migrating
7885  * @locations: result of query
7886  * @page: buffer
7887  * @cred: credential to use for this operation
7888  *
7889  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
7890  * operation failed, or a negative errno if a local error occurred.
7891  *
7892  * On success, "locations" is filled in, but if the server has
7893  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
7894  * asserted.
7895  *
7896  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
7897  * from this client that require migration recovery.
7898  */
7899 int nfs4_proc_get_locations(struct inode *inode,
7900                             struct nfs4_fs_locations *locations,
7901                             struct page *page, const struct cred *cred)
7902 {
7903         struct nfs_server *server = NFS_SERVER(inode);
7904         struct nfs_client *clp = server->nfs_client;
7905         const struct nfs4_mig_recovery_ops *ops =
7906                                         clp->cl_mvops->mig_recovery_ops;
7907         struct nfs4_exception exception = {
7908                 .interruptible = true,
7909         };
7910         int status;
7911
7912         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7913                 (unsigned long long)server->fsid.major,
7914                 (unsigned long long)server->fsid.minor,
7915                 clp->cl_hostname);
7916         nfs_display_fhandle(NFS_FH(inode), __func__);
7917
7918         do {
7919                 status = ops->get_locations(inode, locations, page, cred);
7920                 if (status != -NFS4ERR_DELAY)
7921                         break;
7922                 nfs4_handle_exception(server, status, &exception);
7923         } while (exception.retry);
7924         return status;
7925 }
7926
7927 /*
7928  * This operation also signals the server that this client is
7929  * performing "lease moved" recovery.  The server can stop
7930  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
7931  * is appended to this compound to identify the client ID which is
7932  * performing recovery.
7933  */
7934 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
7935 {
7936         struct nfs_server *server = NFS_SERVER(inode);
7937         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
7938         struct rpc_clnt *clnt = server->client;
7939         struct nfs4_fsid_present_arg args = {
7940                 .fh             = NFS_FH(inode),
7941                 .clientid       = clp->cl_clientid,
7942                 .renew          = 1,            /* append RENEW */
7943         };
7944         struct nfs4_fsid_present_res res = {
7945                 .renew          = 1,
7946         };
7947         struct rpc_message msg = {
7948                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7949                 .rpc_argp       = &args,
7950                 .rpc_resp       = &res,
7951                 .rpc_cred       = cred,
7952         };
7953         unsigned long now = jiffies;
7954         int status;
7955
7956         res.fh = nfs_alloc_fhandle();
7957         if (res.fh == NULL)
7958                 return -ENOMEM;
7959
7960         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7961         status = nfs4_call_sync_sequence(clnt, server, &msg,
7962                                                 &args.seq_args, &res.seq_res);
7963         nfs_free_fhandle(res.fh);
7964         if (status)
7965                 return status;
7966
7967         do_renew_lease(clp, now);
7968         return 0;
7969 }
7970
7971 #ifdef CONFIG_NFS_V4_1
7972
7973 /*
7974  * This operation also signals the server that this client is
7975  * performing "lease moved" recovery.  The server can stop asserting
7976  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
7977  * this operation is identified in the SEQUENCE operation in this
7978  * compound.
7979  */
7980 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
7981 {
7982         struct nfs_server *server = NFS_SERVER(inode);
7983         struct rpc_clnt *clnt = server->client;
7984         struct nfs4_fsid_present_arg args = {
7985                 .fh             = NFS_FH(inode),
7986         };
7987         struct nfs4_fsid_present_res res = {
7988         };
7989         struct rpc_message msg = {
7990                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7991                 .rpc_argp       = &args,
7992                 .rpc_resp       = &res,
7993                 .rpc_cred       = cred,
7994         };
7995         int status;
7996
7997         res.fh = nfs_alloc_fhandle();
7998         if (res.fh == NULL)
7999                 return -ENOMEM;
8000
8001         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8002         status = nfs4_call_sync_sequence(clnt, server, &msg,
8003                                                 &args.seq_args, &res.seq_res);
8004         nfs_free_fhandle(res.fh);
8005         if (status == NFS4_OK &&
8006             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8007                 status = -NFS4ERR_LEASE_MOVED;
8008         return status;
8009 }
8010
8011 #endif  /* CONFIG_NFS_V4_1 */
8012
8013 /**
8014  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8015  * @inode: inode on FSID to check
8016  * @cred: credential to use for this operation
8017  *
8018  * Server indicates whether the FSID is present, moved, or not
8019  * recognized.  This operation is necessary to clear a LEASE_MOVED
8020  * condition for this client ID.
8021  *
8022  * Returns NFS4_OK if the FSID is present on this server,
8023  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8024  *  NFS4ERR code if some error occurred on the server, or a
8025  *  negative errno if a local failure occurred.
8026  */
8027 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8028 {
8029         struct nfs_server *server = NFS_SERVER(inode);
8030         struct nfs_client *clp = server->nfs_client;
8031         const struct nfs4_mig_recovery_ops *ops =
8032                                         clp->cl_mvops->mig_recovery_ops;
8033         struct nfs4_exception exception = {
8034                 .interruptible = true,
8035         };
8036         int status;
8037
8038         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8039                 (unsigned long long)server->fsid.major,
8040                 (unsigned long long)server->fsid.minor,
8041                 clp->cl_hostname);
8042         nfs_display_fhandle(NFS_FH(inode), __func__);
8043
8044         do {
8045                 status = ops->fsid_present(inode, cred);
8046                 if (status != -NFS4ERR_DELAY)
8047                         break;
8048                 nfs4_handle_exception(server, status, &exception);
8049         } while (exception.retry);
8050         return status;
8051 }
8052
8053 /*
8054  * If 'use_integrity' is true and the state managment nfs_client
8055  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8056  * and the machine credential as per RFC3530bis and RFC5661 Security
8057  * Considerations sections. Otherwise, just use the user cred with the
8058  * filesystem's rpc_client.
8059  */
8060 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8061 {
8062         int status;
8063         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8064         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8065         struct nfs4_secinfo_arg args = {
8066                 .dir_fh = NFS_FH(dir),
8067                 .name   = name,
8068         };
8069         struct nfs4_secinfo_res res = {
8070                 .flavors     = flavors,
8071         };
8072         struct rpc_message msg = {
8073                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8074                 .rpc_argp = &args,
8075                 .rpc_resp = &res,
8076         };
8077         struct nfs4_call_sync_data data = {
8078                 .seq_server = NFS_SERVER(dir),
8079                 .seq_args = &args.seq_args,
8080                 .seq_res = &res.seq_res,
8081         };
8082         struct rpc_task_setup task_setup = {
8083                 .rpc_client = clnt,
8084                 .rpc_message = &msg,
8085                 .callback_ops = clp->cl_mvops->call_sync_ops,
8086                 .callback_data = &data,
8087                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8088         };
8089         const struct cred *cred = NULL;
8090
8091         if (use_integrity) {
8092                 clnt = clp->cl_rpcclient;
8093                 task_setup.rpc_client = clnt;
8094
8095                 cred = nfs4_get_clid_cred(clp);
8096                 msg.rpc_cred = cred;
8097         }
8098
8099         dprintk("NFS call  secinfo %s\n", name->name);
8100
8101         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8102         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8103         status = nfs4_call_sync_custom(&task_setup);
8104
8105         dprintk("NFS reply  secinfo: %d\n", status);
8106
8107         put_cred(cred);
8108         return status;
8109 }
8110
8111 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8112                       struct nfs4_secinfo_flavors *flavors)
8113 {
8114         struct nfs4_exception exception = {
8115                 .interruptible = true,
8116         };
8117         int err;
8118         do {
8119                 err = -NFS4ERR_WRONGSEC;
8120
8121                 /* try to use integrity protection with machine cred */
8122                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8123                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8124
8125                 /*
8126                  * if unable to use integrity protection, or SECINFO with
8127                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8128                  * disallowed by spec, but exists in deployed servers) use
8129                  * the current filesystem's rpc_client and the user cred.
8130                  */
8131                 if (err == -NFS4ERR_WRONGSEC)
8132                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8133
8134                 trace_nfs4_secinfo(dir, name, err);
8135                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8136                                 &exception);
8137         } while (exception.retry);
8138         return err;
8139 }
8140
8141 #ifdef CONFIG_NFS_V4_1
8142 /*
8143  * Check the exchange flags returned by the server for invalid flags, having
8144  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8145  * DS flags set.
8146  */
8147 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8148 {
8149         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8150                 goto out_inval;
8151         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8152                 goto out_inval;
8153         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8154             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8155                 goto out_inval;
8156         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8157                 goto out_inval;
8158         return NFS_OK;
8159 out_inval:
8160         return -NFS4ERR_INVAL;
8161 }
8162
8163 static bool
8164 nfs41_same_server_scope(struct nfs41_server_scope *a,
8165                         struct nfs41_server_scope *b)
8166 {
8167         if (a->server_scope_sz != b->server_scope_sz)
8168                 return false;
8169         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8170 }
8171
8172 static void
8173 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8174 {
8175         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8176         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8177         struct nfs_client *clp = args->client;
8178
8179         switch (task->tk_status) {
8180         case -NFS4ERR_BADSESSION:
8181         case -NFS4ERR_DEADSESSION:
8182                 nfs4_schedule_session_recovery(clp->cl_session,
8183                                 task->tk_status);
8184         }
8185         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8186                         res->dir != NFS4_CDFS4_BOTH) {
8187                 rpc_task_close_connection(task);
8188                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8189                         rpc_restart_call(task);
8190         }
8191 }
8192
8193 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8194         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8195 };
8196
8197 /*
8198  * nfs4_proc_bind_one_conn_to_session()
8199  *
8200  * The 4.1 client currently uses the same TCP connection for the
8201  * fore and backchannel.
8202  */
8203 static
8204 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8205                 struct rpc_xprt *xprt,
8206                 struct nfs_client *clp,
8207                 const struct cred *cred)
8208 {
8209         int status;
8210         struct nfs41_bind_conn_to_session_args args = {
8211                 .client = clp,
8212                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8213                 .retries = 0,
8214         };
8215         struct nfs41_bind_conn_to_session_res res;
8216         struct rpc_message msg = {
8217                 .rpc_proc =
8218                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8219                 .rpc_argp = &args,
8220                 .rpc_resp = &res,
8221                 .rpc_cred = cred,
8222         };
8223         struct rpc_task_setup task_setup_data = {
8224                 .rpc_client = clnt,
8225                 .rpc_xprt = xprt,
8226                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8227                 .rpc_message = &msg,
8228                 .flags = RPC_TASK_TIMEOUT,
8229         };
8230         struct rpc_task *task;
8231
8232         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8233         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8234                 args.dir = NFS4_CDFC4_FORE;
8235
8236         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8237         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8238                 args.dir = NFS4_CDFC4_FORE;
8239
8240         task = rpc_run_task(&task_setup_data);
8241         if (!IS_ERR(task)) {
8242                 status = task->tk_status;
8243                 rpc_put_task(task);
8244         } else
8245                 status = PTR_ERR(task);
8246         trace_nfs4_bind_conn_to_session(clp, status);
8247         if (status == 0) {
8248                 if (memcmp(res.sessionid.data,
8249                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8250                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8251                         return -EIO;
8252                 }
8253                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8254                         dprintk("NFS: %s: Unexpected direction from server\n",
8255                                 __func__);
8256                         return -EIO;
8257                 }
8258                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8259                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8260                                 __func__);
8261                         return -EIO;
8262                 }
8263         }
8264
8265         return status;
8266 }
8267
8268 struct rpc_bind_conn_calldata {
8269         struct nfs_client *clp;
8270         const struct cred *cred;
8271 };
8272
8273 static int
8274 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8275                 struct rpc_xprt *xprt,
8276                 void *calldata)
8277 {
8278         struct rpc_bind_conn_calldata *p = calldata;
8279
8280         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8281 }
8282
8283 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8284 {
8285         struct rpc_bind_conn_calldata data = {
8286                 .clp = clp,
8287                 .cred = cred,
8288         };
8289         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8290                         nfs4_proc_bind_conn_to_session_callback, &data);
8291 }
8292
8293 /*
8294  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8295  * and operations we'd like to see to enable certain features in the allow map
8296  */
8297 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8298         .how = SP4_MACH_CRED,
8299         .enforce.u.words = {
8300                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8301                       1 << (OP_EXCHANGE_ID - 32) |
8302                       1 << (OP_CREATE_SESSION - 32) |
8303                       1 << (OP_DESTROY_SESSION - 32) |
8304                       1 << (OP_DESTROY_CLIENTID - 32)
8305         },
8306         .allow.u.words = {
8307                 [0] = 1 << (OP_CLOSE) |
8308                       1 << (OP_OPEN_DOWNGRADE) |
8309                       1 << (OP_LOCKU) |
8310                       1 << (OP_DELEGRETURN) |
8311                       1 << (OP_COMMIT),
8312                 [1] = 1 << (OP_SECINFO - 32) |
8313                       1 << (OP_SECINFO_NO_NAME - 32) |
8314                       1 << (OP_LAYOUTRETURN - 32) |
8315                       1 << (OP_TEST_STATEID - 32) |
8316                       1 << (OP_FREE_STATEID - 32) |
8317                       1 << (OP_WRITE - 32)
8318         }
8319 };
8320
8321 /*
8322  * Select the state protection mode for client `clp' given the server results
8323  * from exchange_id in `sp'.
8324  *
8325  * Returns 0 on success, negative errno otherwise.
8326  */
8327 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8328                                  struct nfs41_state_protection *sp)
8329 {
8330         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8331                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8332                       1 << (OP_EXCHANGE_ID - 32) |
8333                       1 << (OP_CREATE_SESSION - 32) |
8334                       1 << (OP_DESTROY_SESSION - 32) |
8335                       1 << (OP_DESTROY_CLIENTID - 32)
8336         };
8337         unsigned long flags = 0;
8338         unsigned int i;
8339         int ret = 0;
8340
8341         if (sp->how == SP4_MACH_CRED) {
8342                 /* Print state protect result */
8343                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8344                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8345                         if (test_bit(i, sp->enforce.u.longs))
8346                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8347                         if (test_bit(i, sp->allow.u.longs))
8348                                 dfprintk(MOUNT, "  allow op %d\n", i);
8349                 }
8350
8351                 /* make sure nothing is on enforce list that isn't supported */
8352                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8353                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8354                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8355                                 ret = -EINVAL;
8356                                 goto out;
8357                         }
8358                 }
8359
8360                 /*
8361                  * Minimal mode - state operations are allowed to use machine
8362                  * credential.  Note this already happens by default, so the
8363                  * client doesn't have to do anything more than the negotiation.
8364                  *
8365                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8366                  *       we're already using the machine cred for exchange_id
8367                  *       and will never use a different cred.
8368                  */
8369                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8370                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8371                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8372                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8373                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8374                         dfprintk(MOUNT, "  minimal mode enabled\n");
8375                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8376                 } else {
8377                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8378                         ret = -EINVAL;
8379                         goto out;
8380                 }
8381
8382                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8383                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8384                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8385                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8386                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8387                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8388                 }
8389
8390                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8391                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8392                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8393                 }
8394
8395                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8396                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8397                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8398                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8399                 }
8400
8401                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8402                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8403                         dfprintk(MOUNT, "  stateid mode enabled\n");
8404                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8405                 }
8406
8407                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8408                         dfprintk(MOUNT, "  write mode enabled\n");
8409                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8410                 }
8411
8412                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8413                         dfprintk(MOUNT, "  commit mode enabled\n");
8414                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8415                 }
8416         }
8417 out:
8418         clp->cl_sp4_flags = flags;
8419         return ret;
8420 }
8421
8422 struct nfs41_exchange_id_data {
8423         struct nfs41_exchange_id_res res;
8424         struct nfs41_exchange_id_args args;
8425 };
8426
8427 static void nfs4_exchange_id_release(void *data)
8428 {
8429         struct nfs41_exchange_id_data *cdata =
8430                                         (struct nfs41_exchange_id_data *)data;
8431
8432         nfs_put_client(cdata->args.client);
8433         kfree(cdata->res.impl_id);
8434         kfree(cdata->res.server_scope);
8435         kfree(cdata->res.server_owner);
8436         kfree(cdata);
8437 }
8438
8439 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8440         .rpc_release = nfs4_exchange_id_release,
8441 };
8442
8443 /*
8444  * _nfs4_proc_exchange_id()
8445  *
8446  * Wrapper for EXCHANGE_ID operation.
8447  */
8448 static struct rpc_task *
8449 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8450                         u32 sp4_how, struct rpc_xprt *xprt)
8451 {
8452         struct rpc_message msg = {
8453                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8454                 .rpc_cred = cred,
8455         };
8456         struct rpc_task_setup task_setup_data = {
8457                 .rpc_client = clp->cl_rpcclient,
8458                 .callback_ops = &nfs4_exchange_id_call_ops,
8459                 .rpc_message = &msg,
8460                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8461         };
8462         struct nfs41_exchange_id_data *calldata;
8463         int status;
8464
8465         if (!refcount_inc_not_zero(&clp->cl_count))
8466                 return ERR_PTR(-EIO);
8467
8468         status = -ENOMEM;
8469         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8470         if (!calldata)
8471                 goto out;
8472
8473         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8474
8475         status = nfs4_init_uniform_client_string(clp);
8476         if (status)
8477                 goto out_calldata;
8478
8479         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8480                                                 GFP_NOFS);
8481         status = -ENOMEM;
8482         if (unlikely(calldata->res.server_owner == NULL))
8483                 goto out_calldata;
8484
8485         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8486                                         GFP_NOFS);
8487         if (unlikely(calldata->res.server_scope == NULL))
8488                 goto out_server_owner;
8489
8490         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8491         if (unlikely(calldata->res.impl_id == NULL))
8492                 goto out_server_scope;
8493
8494         switch (sp4_how) {
8495         case SP4_NONE:
8496                 calldata->args.state_protect.how = SP4_NONE;
8497                 break;
8498
8499         case SP4_MACH_CRED:
8500                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8501                 break;
8502
8503         default:
8504                 /* unsupported! */
8505                 WARN_ON_ONCE(1);
8506                 status = -EINVAL;
8507                 goto out_impl_id;
8508         }
8509         if (xprt) {
8510                 task_setup_data.rpc_xprt = xprt;
8511                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8512                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8513                                 sizeof(calldata->args.verifier.data));
8514         }
8515         calldata->args.client = clp;
8516         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8517         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8518 #ifdef CONFIG_NFS_V4_1_MIGRATION
8519         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8520 #endif
8521         msg.rpc_argp = &calldata->args;
8522         msg.rpc_resp = &calldata->res;
8523         task_setup_data.callback_data = calldata;
8524
8525         return rpc_run_task(&task_setup_data);
8526
8527 out_impl_id:
8528         kfree(calldata->res.impl_id);
8529 out_server_scope:
8530         kfree(calldata->res.server_scope);
8531 out_server_owner:
8532         kfree(calldata->res.server_owner);
8533 out_calldata:
8534         kfree(calldata);
8535 out:
8536         nfs_put_client(clp);
8537         return ERR_PTR(status);
8538 }
8539
8540 /*
8541  * _nfs4_proc_exchange_id()
8542  *
8543  * Wrapper for EXCHANGE_ID operation.
8544  */
8545 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8546                         u32 sp4_how)
8547 {
8548         struct rpc_task *task;
8549         struct nfs41_exchange_id_args *argp;
8550         struct nfs41_exchange_id_res *resp;
8551         unsigned long now = jiffies;
8552         int status;
8553
8554         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8555         if (IS_ERR(task))
8556                 return PTR_ERR(task);
8557
8558         argp = task->tk_msg.rpc_argp;
8559         resp = task->tk_msg.rpc_resp;
8560         status = task->tk_status;
8561         if (status  != 0)
8562                 goto out;
8563
8564         status = nfs4_check_cl_exchange_flags(resp->flags,
8565                         clp->cl_mvops->minor_version);
8566         if (status  != 0)
8567                 goto out;
8568
8569         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8570         if (status != 0)
8571                 goto out;
8572
8573         do_renew_lease(clp, now);
8574
8575         clp->cl_clientid = resp->clientid;
8576         clp->cl_exchange_flags = resp->flags;
8577         clp->cl_seqid = resp->seqid;
8578         /* Client ID is not confirmed */
8579         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8580                 clear_bit(NFS4_SESSION_ESTABLISHED,
8581                           &clp->cl_session->session_state);
8582
8583         if (clp->cl_serverscope != NULL &&
8584             !nfs41_same_server_scope(clp->cl_serverscope,
8585                                 resp->server_scope)) {
8586                 dprintk("%s: server_scope mismatch detected\n",
8587                         __func__);
8588                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8589         }
8590
8591         swap(clp->cl_serverowner, resp->server_owner);
8592         swap(clp->cl_serverscope, resp->server_scope);
8593         swap(clp->cl_implid, resp->impl_id);
8594
8595         /* Save the EXCHANGE_ID verifier session trunk tests */
8596         memcpy(clp->cl_confirm.data, argp->verifier.data,
8597                sizeof(clp->cl_confirm.data));
8598 out:
8599         trace_nfs4_exchange_id(clp, status);
8600         rpc_put_task(task);
8601         return status;
8602 }
8603
8604 /*
8605  * nfs4_proc_exchange_id()
8606  *
8607  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8608  *
8609  * Since the clientid has expired, all compounds using sessions
8610  * associated with the stale clientid will be returning
8611  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8612  * be in some phase of session reset.
8613  *
8614  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8615  */
8616 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8617 {
8618         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8619         int status;
8620
8621         /* try SP4_MACH_CRED if krb5i/p */
8622         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8623             authflavor == RPC_AUTH_GSS_KRB5P) {
8624                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8625                 if (!status)
8626                         return 0;
8627         }
8628
8629         /* try SP4_NONE */
8630         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8631 }
8632
8633 /**
8634  * nfs4_test_session_trunk
8635  *
8636  * This is an add_xprt_test() test function called from
8637  * rpc_clnt_setup_test_and_add_xprt.
8638  *
8639  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8640  * and is dereferrenced in nfs4_exchange_id_release
8641  *
8642  * Upon success, add the new transport to the rpc_clnt
8643  *
8644  * @clnt: struct rpc_clnt to get new transport
8645  * @xprt: the rpc_xprt to test
8646  * @data: call data for _nfs4_proc_exchange_id.
8647  */
8648 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8649                             void *data)
8650 {
8651         struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
8652         struct rpc_task *task;
8653         int status;
8654
8655         u32 sp4_how;
8656
8657         dprintk("--> %s try %s\n", __func__,
8658                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8659
8660         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8661
8662         /* Test connection for session trunking. Async exchange_id call */
8663         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8664         if (IS_ERR(task))
8665                 return;
8666
8667         status = task->tk_status;
8668         if (status == 0)
8669                 status = nfs4_detect_session_trunking(adata->clp,
8670                                 task->tk_msg.rpc_resp, xprt);
8671
8672         if (status == 0)
8673                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8674
8675         rpc_put_task(task);
8676 }
8677 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8678
8679 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8680                 const struct cred *cred)
8681 {
8682         struct rpc_message msg = {
8683                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8684                 .rpc_argp = clp,
8685                 .rpc_cred = cred,
8686         };
8687         int status;
8688
8689         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8690                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8691         trace_nfs4_destroy_clientid(clp, status);
8692         if (status)
8693                 dprintk("NFS: Got error %d from the server %s on "
8694                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8695         return status;
8696 }
8697
8698 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8699                 const struct cred *cred)
8700 {
8701         unsigned int loop;
8702         int ret;
8703
8704         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8705                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8706                 switch (ret) {
8707                 case -NFS4ERR_DELAY:
8708                 case -NFS4ERR_CLIENTID_BUSY:
8709                         ssleep(1);
8710                         break;
8711                 default:
8712                         return ret;
8713                 }
8714         }
8715         return 0;
8716 }
8717
8718 int nfs4_destroy_clientid(struct nfs_client *clp)
8719 {
8720         const struct cred *cred;
8721         int ret = 0;
8722
8723         if (clp->cl_mvops->minor_version < 1)
8724                 goto out;
8725         if (clp->cl_exchange_flags == 0)
8726                 goto out;
8727         if (clp->cl_preserve_clid)
8728                 goto out;
8729         cred = nfs4_get_clid_cred(clp);
8730         ret = nfs4_proc_destroy_clientid(clp, cred);
8731         put_cred(cred);
8732         switch (ret) {
8733         case 0:
8734         case -NFS4ERR_STALE_CLIENTID:
8735                 clp->cl_exchange_flags = 0;
8736         }
8737 out:
8738         return ret;
8739 }
8740
8741 #endif /* CONFIG_NFS_V4_1 */
8742
8743 struct nfs4_get_lease_time_data {
8744         struct nfs4_get_lease_time_args *args;
8745         struct nfs4_get_lease_time_res *res;
8746         struct nfs_client *clp;
8747 };
8748
8749 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
8750                                         void *calldata)
8751 {
8752         struct nfs4_get_lease_time_data *data =
8753                         (struct nfs4_get_lease_time_data *)calldata;
8754
8755         dprintk("--> %s\n", __func__);
8756         /* just setup sequence, do not trigger session recovery
8757            since we're invoked within one */
8758         nfs4_setup_sequence(data->clp,
8759                         &data->args->la_seq_args,
8760                         &data->res->lr_seq_res,
8761                         task);
8762         dprintk("<-- %s\n", __func__);
8763 }
8764
8765 /*
8766  * Called from nfs4_state_manager thread for session setup, so don't recover
8767  * from sequence operation or clientid errors.
8768  */
8769 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
8770 {
8771         struct nfs4_get_lease_time_data *data =
8772                         (struct nfs4_get_lease_time_data *)calldata;
8773
8774         dprintk("--> %s\n", __func__);
8775         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
8776                 return;
8777         switch (task->tk_status) {
8778         case -NFS4ERR_DELAY:
8779         case -NFS4ERR_GRACE:
8780                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
8781                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
8782                 task->tk_status = 0;
8783                 fallthrough;
8784         case -NFS4ERR_RETRY_UNCACHED_REP:
8785                 rpc_restart_call_prepare(task);
8786                 return;
8787         }
8788         dprintk("<-- %s\n", __func__);
8789 }
8790
8791 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
8792         .rpc_call_prepare = nfs4_get_lease_time_prepare,
8793         .rpc_call_done = nfs4_get_lease_time_done,
8794 };
8795
8796 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
8797 {
8798         struct nfs4_get_lease_time_args args;
8799         struct nfs4_get_lease_time_res res = {
8800                 .lr_fsinfo = fsinfo,
8801         };
8802         struct nfs4_get_lease_time_data data = {
8803                 .args = &args,
8804                 .res = &res,
8805                 .clp = clp,
8806         };
8807         struct rpc_message msg = {
8808                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
8809                 .rpc_argp = &args,
8810                 .rpc_resp = &res,
8811         };
8812         struct rpc_task_setup task_setup = {
8813                 .rpc_client = clp->cl_rpcclient,
8814                 .rpc_message = &msg,
8815                 .callback_ops = &nfs4_get_lease_time_ops,
8816                 .callback_data = &data,
8817                 .flags = RPC_TASK_TIMEOUT,
8818         };
8819
8820         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
8821         return nfs4_call_sync_custom(&task_setup);
8822 }
8823
8824 #ifdef CONFIG_NFS_V4_1
8825
8826 /*
8827  * Initialize the values to be used by the client in CREATE_SESSION
8828  * If nfs4_init_session set the fore channel request and response sizes,
8829  * use them.
8830  *
8831  * Set the back channel max_resp_sz_cached to zero to force the client to
8832  * always set csa_cachethis to FALSE because the current implementation
8833  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
8834  */
8835 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
8836                                     struct rpc_clnt *clnt)
8837 {
8838         unsigned int max_rqst_sz, max_resp_sz;
8839         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
8840         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
8841
8842         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
8843         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
8844
8845         /* Fore channel attributes */
8846         args->fc_attrs.max_rqst_sz = max_rqst_sz;
8847         args->fc_attrs.max_resp_sz = max_resp_sz;
8848         args->fc_attrs.max_ops = NFS4_MAX_OPS;
8849         args->fc_attrs.max_reqs = max_session_slots;
8850
8851         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
8852                 "max_ops=%u max_reqs=%u\n",
8853                 __func__,
8854                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
8855                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
8856
8857         /* Back channel attributes */
8858         args->bc_attrs.max_rqst_sz = max_bc_payload;
8859         args->bc_attrs.max_resp_sz = max_bc_payload;
8860         args->bc_attrs.max_resp_sz_cached = 0;
8861         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
8862         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
8863         if (args->bc_attrs.max_reqs > max_bc_slots)
8864                 args->bc_attrs.max_reqs = max_bc_slots;
8865
8866         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
8867                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
8868                 __func__,
8869                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
8870                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
8871                 args->bc_attrs.max_reqs);
8872 }
8873
8874 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
8875                 struct nfs41_create_session_res *res)
8876 {
8877         struct nfs4_channel_attrs *sent = &args->fc_attrs;
8878         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
8879
8880         if (rcvd->max_resp_sz > sent->max_resp_sz)
8881                 return -EINVAL;
8882         /*
8883          * Our requested max_ops is the minimum we need; we're not
8884          * prepared to break up compounds into smaller pieces than that.
8885          * So, no point even trying to continue if the server won't
8886          * cooperate:
8887          */
8888         if (rcvd->max_ops < sent->max_ops)
8889                 return -EINVAL;
8890         if (rcvd->max_reqs == 0)
8891                 return -EINVAL;
8892         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
8893                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
8894         return 0;
8895 }
8896
8897 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
8898                 struct nfs41_create_session_res *res)
8899 {
8900         struct nfs4_channel_attrs *sent = &args->bc_attrs;
8901         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
8902
8903         if (!(res->flags & SESSION4_BACK_CHAN))
8904                 goto out;
8905         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
8906                 return -EINVAL;
8907         if (rcvd->max_resp_sz < sent->max_resp_sz)
8908                 return -EINVAL;
8909         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
8910                 return -EINVAL;
8911         if (rcvd->max_ops > sent->max_ops)
8912                 return -EINVAL;
8913         if (rcvd->max_reqs > sent->max_reqs)
8914                 return -EINVAL;
8915 out:
8916         return 0;
8917 }
8918
8919 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
8920                                      struct nfs41_create_session_res *res)
8921 {
8922         int ret;
8923
8924         ret = nfs4_verify_fore_channel_attrs(args, res);
8925         if (ret)
8926                 return ret;
8927         return nfs4_verify_back_channel_attrs(args, res);
8928 }
8929
8930 static void nfs4_update_session(struct nfs4_session *session,
8931                 struct nfs41_create_session_res *res)
8932 {
8933         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
8934         /* Mark client id and session as being confirmed */
8935         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
8936         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
8937         session->flags = res->flags;
8938         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
8939         if (res->flags & SESSION4_BACK_CHAN)
8940                 memcpy(&session->bc_attrs, &res->bc_attrs,
8941                                 sizeof(session->bc_attrs));
8942 }
8943
8944 static int _nfs4_proc_create_session(struct nfs_client *clp,
8945                 const struct cred *cred)
8946 {
8947         struct nfs4_session *session = clp->cl_session;
8948         struct nfs41_create_session_args args = {
8949                 .client = clp,
8950                 .clientid = clp->cl_clientid,
8951                 .seqid = clp->cl_seqid,
8952                 .cb_program = NFS4_CALLBACK,
8953         };
8954         struct nfs41_create_session_res res;
8955
8956         struct rpc_message msg = {
8957                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
8958                 .rpc_argp = &args,
8959                 .rpc_resp = &res,
8960                 .rpc_cred = cred,
8961         };
8962         int status;
8963
8964         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
8965         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
8966
8967         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8968                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8969         trace_nfs4_create_session(clp, status);
8970
8971         switch (status) {
8972         case -NFS4ERR_STALE_CLIENTID:
8973         case -NFS4ERR_DELAY:
8974         case -ETIMEDOUT:
8975         case -EACCES:
8976         case -EAGAIN:
8977                 goto out;
8978         }
8979
8980         clp->cl_seqid++;
8981         if (!status) {
8982                 /* Verify the session's negotiated channel_attrs values */
8983                 status = nfs4_verify_channel_attrs(&args, &res);
8984                 /* Increment the clientid slot sequence id */
8985                 if (status)
8986                         goto out;
8987                 nfs4_update_session(session, &res);
8988         }
8989 out:
8990         return status;
8991 }
8992
8993 /*
8994  * Issues a CREATE_SESSION operation to the server.
8995  * It is the responsibility of the caller to verify the session is
8996  * expired before calling this routine.
8997  */
8998 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
8999 {
9000         int status;
9001         unsigned *ptr;
9002         struct nfs4_session *session = clp->cl_session;
9003
9004         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9005
9006         status = _nfs4_proc_create_session(clp, cred);
9007         if (status)
9008                 goto out;
9009
9010         /* Init or reset the session slot tables */
9011         status = nfs4_setup_session_slot_tables(session);
9012         dprintk("slot table setup returned %d\n", status);
9013         if (status)
9014                 goto out;
9015
9016         ptr = (unsigned *)&session->sess_id.data[0];
9017         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9018                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9019 out:
9020         dprintk("<-- %s\n", __func__);
9021         return status;
9022 }
9023
9024 /*
9025  * Issue the over-the-wire RPC DESTROY_SESSION.
9026  * The caller must serialize access to this routine.
9027  */
9028 int nfs4_proc_destroy_session(struct nfs4_session *session,
9029                 const struct cred *cred)
9030 {
9031         struct rpc_message msg = {
9032                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9033                 .rpc_argp = session,
9034                 .rpc_cred = cred,
9035         };
9036         int status = 0;
9037
9038         dprintk("--> nfs4_proc_destroy_session\n");
9039
9040         /* session is still being setup */
9041         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9042                 return 0;
9043
9044         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9045                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9046         trace_nfs4_destroy_session(session->clp, status);
9047
9048         if (status)
9049                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9050                         "Session has been destroyed regardless...\n", status);
9051
9052         dprintk("<-- nfs4_proc_destroy_session\n");
9053         return status;
9054 }
9055
9056 /*
9057  * Renew the cl_session lease.
9058  */
9059 struct nfs4_sequence_data {
9060         struct nfs_client *clp;
9061         struct nfs4_sequence_args args;
9062         struct nfs4_sequence_res res;
9063 };
9064
9065 static void nfs41_sequence_release(void *data)
9066 {
9067         struct nfs4_sequence_data *calldata = data;
9068         struct nfs_client *clp = calldata->clp;
9069
9070         if (refcount_read(&clp->cl_count) > 1)
9071                 nfs4_schedule_state_renewal(clp);
9072         nfs_put_client(clp);
9073         kfree(calldata);
9074 }
9075
9076 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9077 {
9078         switch(task->tk_status) {
9079         case -NFS4ERR_DELAY:
9080                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9081                 return -EAGAIN;
9082         default:
9083                 nfs4_schedule_lease_recovery(clp);
9084         }
9085         return 0;
9086 }
9087
9088 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9089 {
9090         struct nfs4_sequence_data *calldata = data;
9091         struct nfs_client *clp = calldata->clp;
9092
9093         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9094                 return;
9095
9096         trace_nfs4_sequence(clp, task->tk_status);
9097         if (task->tk_status < 0) {
9098                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9099                 if (refcount_read(&clp->cl_count) == 1)
9100                         goto out;
9101
9102                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9103                         rpc_restart_call_prepare(task);
9104                         return;
9105                 }
9106         }
9107         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9108 out:
9109         dprintk("<-- %s\n", __func__);
9110 }
9111
9112 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9113 {
9114         struct nfs4_sequence_data *calldata = data;
9115         struct nfs_client *clp = calldata->clp;
9116         struct nfs4_sequence_args *args;
9117         struct nfs4_sequence_res *res;
9118
9119         args = task->tk_msg.rpc_argp;
9120         res = task->tk_msg.rpc_resp;
9121
9122         nfs4_setup_sequence(clp, args, res, task);
9123 }
9124
9125 static const struct rpc_call_ops nfs41_sequence_ops = {
9126         .rpc_call_done = nfs41_sequence_call_done,
9127         .rpc_call_prepare = nfs41_sequence_prepare,
9128         .rpc_release = nfs41_sequence_release,
9129 };
9130
9131 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9132                 const struct cred *cred,
9133                 struct nfs4_slot *slot,
9134                 bool is_privileged)
9135 {
9136         struct nfs4_sequence_data *calldata;
9137         struct rpc_message msg = {
9138                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9139                 .rpc_cred = cred,
9140         };
9141         struct rpc_task_setup task_setup_data = {
9142                 .rpc_client = clp->cl_rpcclient,
9143                 .rpc_message = &msg,
9144                 .callback_ops = &nfs41_sequence_ops,
9145                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
9146         };
9147         struct rpc_task *ret;
9148
9149         ret = ERR_PTR(-EIO);
9150         if (!refcount_inc_not_zero(&clp->cl_count))
9151                 goto out_err;
9152
9153         ret = ERR_PTR(-ENOMEM);
9154         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9155         if (calldata == NULL)
9156                 goto out_put_clp;
9157         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9158         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9159         msg.rpc_argp = &calldata->args;
9160         msg.rpc_resp = &calldata->res;
9161         calldata->clp = clp;
9162         task_setup_data.callback_data = calldata;
9163
9164         ret = rpc_run_task(&task_setup_data);
9165         if (IS_ERR(ret))
9166                 goto out_err;
9167         return ret;
9168 out_put_clp:
9169         nfs_put_client(clp);
9170 out_err:
9171         nfs41_release_slot(slot);
9172         return ret;
9173 }
9174
9175 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9176 {
9177         struct rpc_task *task;
9178         int ret = 0;
9179
9180         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9181                 return -EAGAIN;
9182         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9183         if (IS_ERR(task))
9184                 ret = PTR_ERR(task);
9185         else
9186                 rpc_put_task_async(task);
9187         dprintk("<-- %s status=%d\n", __func__, ret);
9188         return ret;
9189 }
9190
9191 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9192 {
9193         struct rpc_task *task;
9194         int ret;
9195
9196         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9197         if (IS_ERR(task)) {
9198                 ret = PTR_ERR(task);
9199                 goto out;
9200         }
9201         ret = rpc_wait_for_completion_task(task);
9202         if (!ret)
9203                 ret = task->tk_status;
9204         rpc_put_task(task);
9205 out:
9206         dprintk("<-- %s status=%d\n", __func__, ret);
9207         return ret;
9208 }
9209
9210 struct nfs4_reclaim_complete_data {
9211         struct nfs_client *clp;
9212         struct nfs41_reclaim_complete_args arg;
9213         struct nfs41_reclaim_complete_res res;
9214 };
9215
9216 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9217 {
9218         struct nfs4_reclaim_complete_data *calldata = data;
9219
9220         nfs4_setup_sequence(calldata->clp,
9221                         &calldata->arg.seq_args,
9222                         &calldata->res.seq_res,
9223                         task);
9224 }
9225
9226 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9227 {
9228         switch(task->tk_status) {
9229         case 0:
9230                 wake_up_all(&clp->cl_lock_waitq);
9231                 fallthrough;
9232         case -NFS4ERR_COMPLETE_ALREADY:
9233         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9234                 break;
9235         case -NFS4ERR_DELAY:
9236                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9237                 fallthrough;
9238         case -NFS4ERR_RETRY_UNCACHED_REP:
9239                 return -EAGAIN;
9240         case -NFS4ERR_BADSESSION:
9241         case -NFS4ERR_DEADSESSION:
9242         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9243                 break;
9244         default:
9245                 nfs4_schedule_lease_recovery(clp);
9246         }
9247         return 0;
9248 }
9249
9250 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9251 {
9252         struct nfs4_reclaim_complete_data *calldata = data;
9253         struct nfs_client *clp = calldata->clp;
9254         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9255
9256         dprintk("--> %s\n", __func__);
9257         if (!nfs41_sequence_done(task, res))
9258                 return;
9259
9260         trace_nfs4_reclaim_complete(clp, task->tk_status);
9261         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9262                 rpc_restart_call_prepare(task);
9263                 return;
9264         }
9265         dprintk("<-- %s\n", __func__);
9266 }
9267
9268 static void nfs4_free_reclaim_complete_data(void *data)
9269 {
9270         struct nfs4_reclaim_complete_data *calldata = data;
9271
9272         kfree(calldata);
9273 }
9274
9275 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9276         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9277         .rpc_call_done = nfs4_reclaim_complete_done,
9278         .rpc_release = nfs4_free_reclaim_complete_data,
9279 };
9280
9281 /*
9282  * Issue a global reclaim complete.
9283  */
9284 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9285                 const struct cred *cred)
9286 {
9287         struct nfs4_reclaim_complete_data *calldata;
9288         struct rpc_message msg = {
9289                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9290                 .rpc_cred = cred,
9291         };
9292         struct rpc_task_setup task_setup_data = {
9293                 .rpc_client = clp->cl_rpcclient,
9294                 .rpc_message = &msg,
9295                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9296                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9297         };
9298         int status = -ENOMEM;
9299
9300         dprintk("--> %s\n", __func__);
9301         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9302         if (calldata == NULL)
9303                 goto out;
9304         calldata->clp = clp;
9305         calldata->arg.one_fs = 0;
9306
9307         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9308         msg.rpc_argp = &calldata->arg;
9309         msg.rpc_resp = &calldata->res;
9310         task_setup_data.callback_data = calldata;
9311         status = nfs4_call_sync_custom(&task_setup_data);
9312 out:
9313         dprintk("<-- %s status=%d\n", __func__, status);
9314         return status;
9315 }
9316
9317 static void
9318 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9319 {
9320         struct nfs4_layoutget *lgp = calldata;
9321         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9322
9323         dprintk("--> %s\n", __func__);
9324         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9325                                 &lgp->res.seq_res, task);
9326         dprintk("<-- %s\n", __func__);
9327 }
9328
9329 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9330 {
9331         struct nfs4_layoutget *lgp = calldata;
9332
9333         dprintk("--> %s\n", __func__);
9334         nfs41_sequence_process(task, &lgp->res.seq_res);
9335         dprintk("<-- %s\n", __func__);
9336 }
9337
9338 static int
9339 nfs4_layoutget_handle_exception(struct rpc_task *task,
9340                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9341 {
9342         struct inode *inode = lgp->args.inode;
9343         struct nfs_server *server = NFS_SERVER(inode);
9344         struct pnfs_layout_hdr *lo;
9345         int nfs4err = task->tk_status;
9346         int err, status = 0;
9347         LIST_HEAD(head);
9348
9349         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9350
9351         nfs4_sequence_free_slot(&lgp->res.seq_res);
9352
9353         switch (nfs4err) {
9354         case 0:
9355                 goto out;
9356
9357         /*
9358          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9359          * on the file. set tk_status to -ENODATA to tell upper layer to
9360          * retry go inband.
9361          */
9362         case -NFS4ERR_LAYOUTUNAVAILABLE:
9363                 status = -ENODATA;
9364                 goto out;
9365         /*
9366          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9367          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9368          */
9369         case -NFS4ERR_BADLAYOUT:
9370                 status = -EOVERFLOW;
9371                 goto out;
9372         /*
9373          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9374          * (or clients) writing to the same RAID stripe except when
9375          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9376          *
9377          * Treat it like we would RECALLCONFLICT -- we retry for a little
9378          * while, and then eventually give up.
9379          */
9380         case -NFS4ERR_LAYOUTTRYLATER:
9381                 if (lgp->args.minlength == 0) {
9382                         status = -EOVERFLOW;
9383                         goto out;
9384                 }
9385                 status = -EBUSY;
9386                 break;
9387         case -NFS4ERR_RECALLCONFLICT:
9388                 status = -ERECALLCONFLICT;
9389                 break;
9390         case -NFS4ERR_DELEG_REVOKED:
9391         case -NFS4ERR_ADMIN_REVOKED:
9392         case -NFS4ERR_EXPIRED:
9393         case -NFS4ERR_BAD_STATEID:
9394                 exception->timeout = 0;
9395                 spin_lock(&inode->i_lock);
9396                 lo = NFS_I(inode)->layout;
9397                 /* If the open stateid was bad, then recover it. */
9398                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9399                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9400                         spin_unlock(&inode->i_lock);
9401                         exception->state = lgp->args.ctx->state;
9402                         exception->stateid = &lgp->args.stateid;
9403                         break;
9404                 }
9405
9406                 /*
9407                  * Mark the bad layout state as invalid, then retry
9408                  */
9409                 pnfs_mark_layout_stateid_invalid(lo, &head);
9410                 spin_unlock(&inode->i_lock);
9411                 nfs_commit_inode(inode, 0);
9412                 pnfs_free_lseg_list(&head);
9413                 status = -EAGAIN;
9414                 goto out;
9415         }
9416
9417         err = nfs4_handle_exception(server, nfs4err, exception);
9418         if (!status) {
9419                 if (exception->retry)
9420                         status = -EAGAIN;
9421                 else
9422                         status = err;
9423         }
9424 out:
9425         dprintk("<-- %s\n", __func__);
9426         return status;
9427 }
9428
9429 size_t max_response_pages(struct nfs_server *server)
9430 {
9431         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9432         return nfs_page_array_len(0, max_resp_sz);
9433 }
9434
9435 static void nfs4_layoutget_release(void *calldata)
9436 {
9437         struct nfs4_layoutget *lgp = calldata;
9438
9439         dprintk("--> %s\n", __func__);
9440         nfs4_sequence_free_slot(&lgp->res.seq_res);
9441         pnfs_layoutget_free(lgp);
9442         dprintk("<-- %s\n", __func__);
9443 }
9444
9445 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9446         .rpc_call_prepare = nfs4_layoutget_prepare,
9447         .rpc_call_done = nfs4_layoutget_done,
9448         .rpc_release = nfs4_layoutget_release,
9449 };
9450
9451 struct pnfs_layout_segment *
9452 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9453 {
9454         struct inode *inode = lgp->args.inode;
9455         struct nfs_server *server = NFS_SERVER(inode);
9456         struct rpc_task *task;
9457         struct rpc_message msg = {
9458                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9459                 .rpc_argp = &lgp->args,
9460                 .rpc_resp = &lgp->res,
9461                 .rpc_cred = lgp->cred,
9462         };
9463         struct rpc_task_setup task_setup_data = {
9464                 .rpc_client = server->client,
9465                 .rpc_message = &msg,
9466                 .callback_ops = &nfs4_layoutget_call_ops,
9467                 .callback_data = lgp,
9468                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
9469         };
9470         struct pnfs_layout_segment *lseg = NULL;
9471         struct nfs4_exception exception = {
9472                 .inode = inode,
9473                 .timeout = *timeout,
9474         };
9475         int status = 0;
9476
9477         dprintk("--> %s\n", __func__);
9478
9479         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
9480         pnfs_get_layout_hdr(NFS_I(inode)->layout);
9481
9482         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9483
9484         task = rpc_run_task(&task_setup_data);
9485
9486         status = rpc_wait_for_completion_task(task);
9487         if (status != 0)
9488                 goto out;
9489
9490         if (task->tk_status < 0) {
9491                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9492                 *timeout = exception.timeout;
9493         } else if (lgp->res.layoutp->len == 0) {
9494                 status = -EAGAIN;
9495                 *timeout = nfs4_update_delay(&exception.timeout);
9496         } else
9497                 lseg = pnfs_layout_process(lgp);
9498 out:
9499         trace_nfs4_layoutget(lgp->args.ctx,
9500                         &lgp->args.range,
9501                         &lgp->res.range,
9502                         &lgp->res.stateid,
9503                         status);
9504
9505         rpc_put_task(task);
9506         dprintk("<-- %s status=%d\n", __func__, status);
9507         if (status)
9508                 return ERR_PTR(status);
9509         return lseg;
9510 }
9511
9512 static void
9513 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9514 {
9515         struct nfs4_layoutreturn *lrp = calldata;
9516
9517         dprintk("--> %s\n", __func__);
9518         nfs4_setup_sequence(lrp->clp,
9519                         &lrp->args.seq_args,
9520                         &lrp->res.seq_res,
9521                         task);
9522         if (!pnfs_layout_is_valid(lrp->args.layout))
9523                 rpc_exit(task, 0);
9524 }
9525
9526 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9527 {
9528         struct nfs4_layoutreturn *lrp = calldata;
9529         struct nfs_server *server;
9530
9531         dprintk("--> %s\n", __func__);
9532
9533         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9534                 return;
9535
9536         /*
9537          * Was there an RPC level error? Assume the call succeeded,
9538          * and that we need to release the layout
9539          */
9540         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9541                 lrp->res.lrs_present = 0;
9542                 return;
9543         }
9544
9545         server = NFS_SERVER(lrp->args.inode);
9546         switch (task->tk_status) {
9547         case -NFS4ERR_OLD_STATEID:
9548                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9549                                         &lrp->args.range,
9550                                         lrp->args.inode))
9551                         goto out_restart;
9552                 fallthrough;
9553         default:
9554                 task->tk_status = 0;
9555                 fallthrough;
9556         case 0:
9557                 break;
9558         case -NFS4ERR_DELAY:
9559                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9560                         break;
9561                 goto out_restart;
9562         }
9563         dprintk("<-- %s\n", __func__);
9564         return;
9565 out_restart:
9566         task->tk_status = 0;
9567         nfs4_sequence_free_slot(&lrp->res.seq_res);
9568         rpc_restart_call_prepare(task);
9569 }
9570
9571 static void nfs4_layoutreturn_release(void *calldata)
9572 {
9573         struct nfs4_layoutreturn *lrp = calldata;
9574         struct pnfs_layout_hdr *lo = lrp->args.layout;
9575
9576         dprintk("--> %s\n", __func__);
9577         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9578                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9579         nfs4_sequence_free_slot(&lrp->res.seq_res);
9580         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9581                 lrp->ld_private.ops->free(&lrp->ld_private);
9582         pnfs_put_layout_hdr(lrp->args.layout);
9583         nfs_iput_and_deactive(lrp->inode);
9584         put_cred(lrp->cred);
9585         kfree(calldata);
9586         dprintk("<-- %s\n", __func__);
9587 }
9588
9589 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9590         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9591         .rpc_call_done = nfs4_layoutreturn_done,
9592         .rpc_release = nfs4_layoutreturn_release,
9593 };
9594
9595 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9596 {
9597         struct rpc_task *task;
9598         struct rpc_message msg = {
9599                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9600                 .rpc_argp = &lrp->args,
9601                 .rpc_resp = &lrp->res,
9602                 .rpc_cred = lrp->cred,
9603         };
9604         struct rpc_task_setup task_setup_data = {
9605                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9606                 .rpc_message = &msg,
9607                 .callback_ops = &nfs4_layoutreturn_call_ops,
9608                 .callback_data = lrp,
9609         };
9610         int status = 0;
9611
9612         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9613                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9614                         &task_setup_data.rpc_client, &msg);
9615
9616         dprintk("--> %s\n", __func__);
9617         if (!sync) {
9618                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9619                 if (!lrp->inode) {
9620                         nfs4_layoutreturn_release(lrp);
9621                         return -EAGAIN;
9622                 }
9623                 task_setup_data.flags |= RPC_TASK_ASYNC;
9624         }
9625         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0);
9626         task = rpc_run_task(&task_setup_data);
9627         if (IS_ERR(task))
9628                 return PTR_ERR(task);
9629         if (sync)
9630                 status = task->tk_status;
9631         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9632         dprintk("<-- %s status=%d\n", __func__, status);
9633         rpc_put_task(task);
9634         return status;
9635 }
9636
9637 static int
9638 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9639                 struct pnfs_device *pdev,
9640                 const struct cred *cred)
9641 {
9642         struct nfs4_getdeviceinfo_args args = {
9643                 .pdev = pdev,
9644                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9645                         NOTIFY_DEVICEID4_DELETE,
9646         };
9647         struct nfs4_getdeviceinfo_res res = {
9648                 .pdev = pdev,
9649         };
9650         struct rpc_message msg = {
9651                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9652                 .rpc_argp = &args,
9653                 .rpc_resp = &res,
9654                 .rpc_cred = cred,
9655         };
9656         int status;
9657
9658         dprintk("--> %s\n", __func__);
9659         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9660         if (res.notification & ~args.notify_types)
9661                 dprintk("%s: unsupported notification\n", __func__);
9662         if (res.notification != args.notify_types)
9663                 pdev->nocache = 1;
9664
9665         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9666
9667         dprintk("<-- %s status=%d\n", __func__, status);
9668
9669         return status;
9670 }
9671
9672 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9673                 struct pnfs_device *pdev,
9674                 const struct cred *cred)
9675 {
9676         struct nfs4_exception exception = { };
9677         int err;
9678
9679         do {
9680                 err = nfs4_handle_exception(server,
9681                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9682                                         &exception);
9683         } while (exception.retry);
9684         return err;
9685 }
9686 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9687
9688 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9689 {
9690         struct nfs4_layoutcommit_data *data = calldata;
9691         struct nfs_server *server = NFS_SERVER(data->args.inode);
9692
9693         nfs4_setup_sequence(server->nfs_client,
9694                         &data->args.seq_args,
9695                         &data->res.seq_res,
9696                         task);
9697 }
9698
9699 static void
9700 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9701 {
9702         struct nfs4_layoutcommit_data *data = calldata;
9703         struct nfs_server *server = NFS_SERVER(data->args.inode);
9704
9705         if (!nfs41_sequence_done(task, &data->res.seq_res))
9706                 return;
9707
9708         switch (task->tk_status) { /* Just ignore these failures */
9709         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9710         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9711         case -NFS4ERR_BADLAYOUT:     /* no layout */
9712         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9713                 task->tk_status = 0;
9714         case 0:
9715                 break;
9716         default:
9717                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9718                         rpc_restart_call_prepare(task);
9719                         return;
9720                 }
9721         }
9722 }
9723
9724 static void nfs4_layoutcommit_release(void *calldata)
9725 {
9726         struct nfs4_layoutcommit_data *data = calldata;
9727
9728         pnfs_cleanup_layoutcommit(data);
9729         nfs_post_op_update_inode_force_wcc(data->args.inode,
9730                                            data->res.fattr);
9731         put_cred(data->cred);
9732         nfs_iput_and_deactive(data->inode);
9733         kfree(data);
9734 }
9735
9736 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9737         .rpc_call_prepare = nfs4_layoutcommit_prepare,
9738         .rpc_call_done = nfs4_layoutcommit_done,
9739         .rpc_release = nfs4_layoutcommit_release,
9740 };
9741
9742 int
9743 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9744 {
9745         struct rpc_message msg = {
9746                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9747                 .rpc_argp = &data->args,
9748                 .rpc_resp = &data->res,
9749                 .rpc_cred = data->cred,
9750         };
9751         struct rpc_task_setup task_setup_data = {
9752                 .task = &data->task,
9753                 .rpc_client = NFS_CLIENT(data->args.inode),
9754                 .rpc_message = &msg,
9755                 .callback_ops = &nfs4_layoutcommit_ops,
9756                 .callback_data = data,
9757         };
9758         struct rpc_task *task;
9759         int status = 0;
9760
9761         dprintk("NFS: initiating layoutcommit call. sync %d "
9762                 "lbw: %llu inode %lu\n", sync,
9763                 data->args.lastbytewritten,
9764                 data->args.inode->i_ino);
9765
9766         if (!sync) {
9767                 data->inode = nfs_igrab_and_active(data->args.inode);
9768                 if (data->inode == NULL) {
9769                         nfs4_layoutcommit_release(data);
9770                         return -EAGAIN;
9771                 }
9772                 task_setup_data.flags = RPC_TASK_ASYNC;
9773         }
9774         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
9775         task = rpc_run_task(&task_setup_data);
9776         if (IS_ERR(task))
9777                 return PTR_ERR(task);
9778         if (sync)
9779                 status = task->tk_status;
9780         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
9781         dprintk("%s: status %d\n", __func__, status);
9782         rpc_put_task(task);
9783         return status;
9784 }
9785
9786 /*
9787  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
9788  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
9789  */
9790 static int
9791 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9792                     struct nfs_fsinfo *info,
9793                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
9794 {
9795         struct nfs41_secinfo_no_name_args args = {
9796                 .style = SECINFO_STYLE_CURRENT_FH,
9797         };
9798         struct nfs4_secinfo_res res = {
9799                 .flavors = flavors,
9800         };
9801         struct rpc_message msg = {
9802                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
9803                 .rpc_argp = &args,
9804                 .rpc_resp = &res,
9805         };
9806         struct nfs4_call_sync_data data = {
9807                 .seq_server = server,
9808                 .seq_args = &args.seq_args,
9809                 .seq_res = &res.seq_res,
9810         };
9811         struct rpc_task_setup task_setup = {
9812                 .rpc_client = server->client,
9813                 .rpc_message = &msg,
9814                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
9815                 .callback_data = &data,
9816                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9817         };
9818         const struct cred *cred = NULL;
9819         int status;
9820
9821         if (use_integrity) {
9822                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
9823
9824                 cred = nfs4_get_clid_cred(server->nfs_client);
9825                 msg.rpc_cred = cred;
9826         }
9827
9828         dprintk("--> %s\n", __func__);
9829         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
9830         status = nfs4_call_sync_custom(&task_setup);
9831         dprintk("<-- %s status=%d\n", __func__, status);
9832
9833         put_cred(cred);
9834
9835         return status;
9836 }
9837
9838 static int
9839 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9840                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
9841 {
9842         struct nfs4_exception exception = {
9843                 .interruptible = true,
9844         };
9845         int err;
9846         do {
9847                 /* first try using integrity protection */
9848                 err = -NFS4ERR_WRONGSEC;
9849
9850                 /* try to use integrity protection with machine cred */
9851                 if (_nfs4_is_integrity_protected(server->nfs_client))
9852                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9853                                                           flavors, true);
9854
9855                 /*
9856                  * if unable to use integrity protection, or SECINFO with
9857                  * integrity protection returns NFS4ERR_WRONGSEC (which is
9858                  * disallowed by spec, but exists in deployed servers) use
9859                  * the current filesystem's rpc_client and the user cred.
9860                  */
9861                 if (err == -NFS4ERR_WRONGSEC)
9862                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9863                                                           flavors, false);
9864
9865                 switch (err) {
9866                 case 0:
9867                 case -NFS4ERR_WRONGSEC:
9868                 case -ENOTSUPP:
9869                         goto out;
9870                 default:
9871                         err = nfs4_handle_exception(server, err, &exception);
9872                 }
9873         } while (exception.retry);
9874 out:
9875         return err;
9876 }
9877
9878 static int
9879 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
9880                     struct nfs_fsinfo *info)
9881 {
9882         int err;
9883         struct page *page;
9884         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
9885         struct nfs4_secinfo_flavors *flavors;
9886         struct nfs4_secinfo4 *secinfo;
9887         int i;
9888
9889         page = alloc_page(GFP_KERNEL);
9890         if (!page) {
9891                 err = -ENOMEM;
9892                 goto out;
9893         }
9894
9895         flavors = page_address(page);
9896         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
9897
9898         /*
9899          * Fall back on "guess and check" method if
9900          * the server doesn't support SECINFO_NO_NAME
9901          */
9902         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
9903                 err = nfs4_find_root_sec(server, fhandle, info);
9904                 goto out_freepage;
9905         }
9906         if (err)
9907                 goto out_freepage;
9908
9909         for (i = 0; i < flavors->num_flavors; i++) {
9910                 secinfo = &flavors->flavors[i];
9911
9912                 switch (secinfo->flavor) {
9913                 case RPC_AUTH_NULL:
9914                 case RPC_AUTH_UNIX:
9915                 case RPC_AUTH_GSS:
9916                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
9917                                         &secinfo->flavor_info);
9918                         break;
9919                 default:
9920                         flavor = RPC_AUTH_MAXFLAVOR;
9921                         break;
9922                 }
9923
9924                 if (!nfs_auth_info_match(&server->auth_info, flavor))
9925                         flavor = RPC_AUTH_MAXFLAVOR;
9926
9927                 if (flavor != RPC_AUTH_MAXFLAVOR) {
9928                         err = nfs4_lookup_root_sec(server, fhandle,
9929                                                    info, flavor);
9930                         if (!err)
9931                                 break;
9932                 }
9933         }
9934
9935         if (flavor == RPC_AUTH_MAXFLAVOR)
9936                 err = -EPERM;
9937
9938 out_freepage:
9939         put_page(page);
9940         if (err == -EACCES)
9941                 return -EPERM;
9942 out:
9943         return err;
9944 }
9945
9946 static int _nfs41_test_stateid(struct nfs_server *server,
9947                 nfs4_stateid *stateid,
9948                 const struct cred *cred)
9949 {
9950         int status;
9951         struct nfs41_test_stateid_args args = {
9952                 .stateid = stateid,
9953         };
9954         struct nfs41_test_stateid_res res;
9955         struct rpc_message msg = {
9956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
9957                 .rpc_argp = &args,
9958                 .rpc_resp = &res,
9959                 .rpc_cred = cred,
9960         };
9961         struct rpc_clnt *rpc_client = server->client;
9962
9963         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9964                 &rpc_client, &msg);
9965
9966         dprintk("NFS call  test_stateid %p\n", stateid);
9967         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
9968         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
9969                         &args.seq_args, &res.seq_res);
9970         if (status != NFS_OK) {
9971                 dprintk("NFS reply test_stateid: failed, %d\n", status);
9972                 return status;
9973         }
9974         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
9975         return -res.status;
9976 }
9977
9978 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
9979                 int err, struct nfs4_exception *exception)
9980 {
9981         exception->retry = 0;
9982         switch(err) {
9983         case -NFS4ERR_DELAY:
9984         case -NFS4ERR_RETRY_UNCACHED_REP:
9985                 nfs4_handle_exception(server, err, exception);
9986                 break;
9987         case -NFS4ERR_BADSESSION:
9988         case -NFS4ERR_BADSLOT:
9989         case -NFS4ERR_BAD_HIGH_SLOT:
9990         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9991         case -NFS4ERR_DEADSESSION:
9992                 nfs4_do_handle_exception(server, err, exception);
9993         }
9994 }
9995
9996 /**
9997  * nfs41_test_stateid - perform a TEST_STATEID operation
9998  *
9999  * @server: server / transport on which to perform the operation
10000  * @stateid: state ID to test
10001  * @cred: credential
10002  *
10003  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10004  * Otherwise a negative NFS4ERR value is returned if the operation
10005  * failed or the state ID is not currently valid.
10006  */
10007 static int nfs41_test_stateid(struct nfs_server *server,
10008                 nfs4_stateid *stateid,
10009                 const struct cred *cred)
10010 {
10011         struct nfs4_exception exception = {
10012                 .interruptible = true,
10013         };
10014         int err;
10015         do {
10016                 err = _nfs41_test_stateid(server, stateid, cred);
10017                 nfs4_handle_delay_or_session_error(server, err, &exception);
10018         } while (exception.retry);
10019         return err;
10020 }
10021
10022 struct nfs_free_stateid_data {
10023         struct nfs_server *server;
10024         struct nfs41_free_stateid_args args;
10025         struct nfs41_free_stateid_res res;
10026 };
10027
10028 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10029 {
10030         struct nfs_free_stateid_data *data = calldata;
10031         nfs4_setup_sequence(data->server->nfs_client,
10032                         &data->args.seq_args,
10033                         &data->res.seq_res,
10034                         task);
10035 }
10036
10037 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10038 {
10039         struct nfs_free_stateid_data *data = calldata;
10040
10041         nfs41_sequence_done(task, &data->res.seq_res);
10042
10043         switch (task->tk_status) {
10044         case -NFS4ERR_DELAY:
10045                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10046                         rpc_restart_call_prepare(task);
10047         }
10048 }
10049
10050 static void nfs41_free_stateid_release(void *calldata)
10051 {
10052         kfree(calldata);
10053 }
10054
10055 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10056         .rpc_call_prepare = nfs41_free_stateid_prepare,
10057         .rpc_call_done = nfs41_free_stateid_done,
10058         .rpc_release = nfs41_free_stateid_release,
10059 };
10060
10061 /**
10062  * nfs41_free_stateid - perform a FREE_STATEID operation
10063  *
10064  * @server: server / transport on which to perform the operation
10065  * @stateid: state ID to release
10066  * @cred: credential
10067  * @privileged: set to true if this call needs to be privileged
10068  *
10069  * Note: this function is always asynchronous.
10070  */
10071 static int nfs41_free_stateid(struct nfs_server *server,
10072                 const nfs4_stateid *stateid,
10073                 const struct cred *cred,
10074                 bool privileged)
10075 {
10076         struct rpc_message msg = {
10077                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10078                 .rpc_cred = cred,
10079         };
10080         struct rpc_task_setup task_setup = {
10081                 .rpc_client = server->client,
10082                 .rpc_message = &msg,
10083                 .callback_ops = &nfs41_free_stateid_ops,
10084                 .flags = RPC_TASK_ASYNC,
10085         };
10086         struct nfs_free_stateid_data *data;
10087         struct rpc_task *task;
10088
10089         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10090                 &task_setup.rpc_client, &msg);
10091
10092         dprintk("NFS call  free_stateid %p\n", stateid);
10093         data = kmalloc(sizeof(*data), GFP_NOFS);
10094         if (!data)
10095                 return -ENOMEM;
10096         data->server = server;
10097         nfs4_stateid_copy(&data->args.stateid, stateid);
10098
10099         task_setup.callback_data = data;
10100
10101         msg.rpc_argp = &data->args;
10102         msg.rpc_resp = &data->res;
10103         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10104         task = rpc_run_task(&task_setup);
10105         if (IS_ERR(task))
10106                 return PTR_ERR(task);
10107         rpc_put_task(task);
10108         return 0;
10109 }
10110
10111 static void
10112 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10113 {
10114         const struct cred *cred = lsp->ls_state->owner->so_cred;
10115
10116         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10117         nfs4_free_lock_state(server, lsp);
10118 }
10119
10120 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10121                 const nfs4_stateid *s2)
10122 {
10123         if (s1->type != s2->type)
10124                 return false;
10125
10126         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10127                 return false;
10128
10129         if (s1->seqid == s2->seqid)
10130                 return true;
10131
10132         return s1->seqid == 0 || s2->seqid == 0;
10133 }
10134
10135 #endif /* CONFIG_NFS_V4_1 */
10136
10137 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10138                 const nfs4_stateid *s2)
10139 {
10140         return nfs4_stateid_match(s1, s2);
10141 }
10142
10143
10144 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10145         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10146         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10147         .recover_open   = nfs4_open_reclaim,
10148         .recover_lock   = nfs4_lock_reclaim,
10149         .establish_clid = nfs4_init_clientid,
10150         .detect_trunking = nfs40_discover_server_trunking,
10151 };
10152
10153 #if defined(CONFIG_NFS_V4_1)
10154 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10155         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10156         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10157         .recover_open   = nfs4_open_reclaim,
10158         .recover_lock   = nfs4_lock_reclaim,
10159         .establish_clid = nfs41_init_clientid,
10160         .reclaim_complete = nfs41_proc_reclaim_complete,
10161         .detect_trunking = nfs41_discover_server_trunking,
10162 };
10163 #endif /* CONFIG_NFS_V4_1 */
10164
10165 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10166         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10167         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10168         .recover_open   = nfs40_open_expired,
10169         .recover_lock   = nfs4_lock_expired,
10170         .establish_clid = nfs4_init_clientid,
10171 };
10172
10173 #if defined(CONFIG_NFS_V4_1)
10174 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10175         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10176         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10177         .recover_open   = nfs41_open_expired,
10178         .recover_lock   = nfs41_lock_expired,
10179         .establish_clid = nfs41_init_clientid,
10180 };
10181 #endif /* CONFIG_NFS_V4_1 */
10182
10183 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10184         .sched_state_renewal = nfs4_proc_async_renew,
10185         .get_state_renewal_cred = nfs4_get_renew_cred,
10186         .renew_lease = nfs4_proc_renew,
10187 };
10188
10189 #if defined(CONFIG_NFS_V4_1)
10190 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10191         .sched_state_renewal = nfs41_proc_async_sequence,
10192         .get_state_renewal_cred = nfs4_get_machine_cred,
10193         .renew_lease = nfs4_proc_sequence,
10194 };
10195 #endif
10196
10197 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10198         .get_locations = _nfs40_proc_get_locations,
10199         .fsid_present = _nfs40_proc_fsid_present,
10200 };
10201
10202 #if defined(CONFIG_NFS_V4_1)
10203 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10204         .get_locations = _nfs41_proc_get_locations,
10205         .fsid_present = _nfs41_proc_fsid_present,
10206 };
10207 #endif  /* CONFIG_NFS_V4_1 */
10208
10209 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10210         .minor_version = 0,
10211         .init_caps = NFS_CAP_READDIRPLUS
10212                 | NFS_CAP_ATOMIC_OPEN
10213                 | NFS_CAP_POSIX_LOCK,
10214         .init_client = nfs40_init_client,
10215         .shutdown_client = nfs40_shutdown_client,
10216         .match_stateid = nfs4_match_stateid,
10217         .find_root_sec = nfs4_find_root_sec,
10218         .free_lock_state = nfs4_release_lockowner,
10219         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10220         .alloc_seqid = nfs_alloc_seqid,
10221         .call_sync_ops = &nfs40_call_sync_ops,
10222         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10223         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10224         .state_renewal_ops = &nfs40_state_renewal_ops,
10225         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10226 };
10227
10228 #if defined(CONFIG_NFS_V4_1)
10229 static struct nfs_seqid *
10230 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10231 {
10232         return NULL;
10233 }
10234
10235 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10236         .minor_version = 1,
10237         .init_caps = NFS_CAP_READDIRPLUS
10238                 | NFS_CAP_ATOMIC_OPEN
10239                 | NFS_CAP_POSIX_LOCK
10240                 | NFS_CAP_STATEID_NFSV41
10241                 | NFS_CAP_ATOMIC_OPEN_V1
10242                 | NFS_CAP_LGOPEN,
10243         .init_client = nfs41_init_client,
10244         .shutdown_client = nfs41_shutdown_client,
10245         .match_stateid = nfs41_match_stateid,
10246         .find_root_sec = nfs41_find_root_sec,
10247         .free_lock_state = nfs41_free_lock_state,
10248         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10249         .alloc_seqid = nfs_alloc_no_seqid,
10250         .session_trunk = nfs4_test_session_trunk,
10251         .call_sync_ops = &nfs41_call_sync_ops,
10252         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10253         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10254         .state_renewal_ops = &nfs41_state_renewal_ops,
10255         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10256 };
10257 #endif
10258
10259 #if defined(CONFIG_NFS_V4_2)
10260 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10261         .minor_version = 2,
10262         .init_caps = NFS_CAP_READDIRPLUS
10263                 | NFS_CAP_ATOMIC_OPEN
10264                 | NFS_CAP_POSIX_LOCK
10265                 | NFS_CAP_STATEID_NFSV41
10266                 | NFS_CAP_ATOMIC_OPEN_V1
10267                 | NFS_CAP_LGOPEN
10268                 | NFS_CAP_ALLOCATE
10269                 | NFS_CAP_COPY
10270                 | NFS_CAP_OFFLOAD_CANCEL
10271                 | NFS_CAP_COPY_NOTIFY
10272                 | NFS_CAP_DEALLOCATE
10273                 | NFS_CAP_SEEK
10274                 | NFS_CAP_LAYOUTSTATS
10275                 | NFS_CAP_CLONE
10276                 | NFS_CAP_LAYOUTERROR
10277                 | NFS_CAP_READ_PLUS,
10278         .init_client = nfs41_init_client,
10279         .shutdown_client = nfs41_shutdown_client,
10280         .match_stateid = nfs41_match_stateid,
10281         .find_root_sec = nfs41_find_root_sec,
10282         .free_lock_state = nfs41_free_lock_state,
10283         .call_sync_ops = &nfs41_call_sync_ops,
10284         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10285         .alloc_seqid = nfs_alloc_no_seqid,
10286         .session_trunk = nfs4_test_session_trunk,
10287         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10288         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10289         .state_renewal_ops = &nfs41_state_renewal_ops,
10290         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10291 };
10292 #endif
10293
10294 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10295         [0] = &nfs_v4_0_minor_ops,
10296 #if defined(CONFIG_NFS_V4_1)
10297         [1] = &nfs_v4_1_minor_ops,
10298 #endif
10299 #if defined(CONFIG_NFS_V4_2)
10300         [2] = &nfs_v4_2_minor_ops,
10301 #endif
10302 };
10303
10304 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10305 {
10306         ssize_t error, error2, error3;
10307
10308         error = generic_listxattr(dentry, list, size);
10309         if (error < 0)
10310                 return error;
10311         if (list) {
10312                 list += error;
10313                 size -= error;
10314         }
10315
10316         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10317         if (error2 < 0)
10318                 return error2;
10319
10320         if (list) {
10321                 list += error2;
10322                 size -= error2;
10323         }
10324
10325         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10326         if (error3 < 0)
10327                 return error3;
10328
10329         return error + error2 + error3;
10330 }
10331
10332 static const struct inode_operations nfs4_dir_inode_operations = {
10333         .create         = nfs_create,
10334         .lookup         = nfs_lookup,
10335         .atomic_open    = nfs_atomic_open,
10336         .link           = nfs_link,
10337         .unlink         = nfs_unlink,
10338         .symlink        = nfs_symlink,
10339         .mkdir          = nfs_mkdir,
10340         .rmdir          = nfs_rmdir,
10341         .mknod          = nfs_mknod,
10342         .rename         = nfs_rename,
10343         .permission     = nfs_permission,
10344         .getattr        = nfs_getattr,
10345         .setattr        = nfs_setattr,
10346         .listxattr      = nfs4_listxattr,
10347 };
10348
10349 static const struct inode_operations nfs4_file_inode_operations = {
10350         .permission     = nfs_permission,
10351         .getattr        = nfs_getattr,
10352         .setattr        = nfs_setattr,
10353         .listxattr      = nfs4_listxattr,
10354 };
10355
10356 const struct nfs_rpc_ops nfs_v4_clientops = {
10357         .version        = 4,                    /* protocol version */
10358         .dentry_ops     = &nfs4_dentry_operations,
10359         .dir_inode_ops  = &nfs4_dir_inode_operations,
10360         .file_inode_ops = &nfs4_file_inode_operations,
10361         .file_ops       = &nfs4_file_operations,
10362         .getroot        = nfs4_proc_get_root,
10363         .submount       = nfs4_submount,
10364         .try_get_tree   = nfs4_try_get_tree,
10365         .getattr        = nfs4_proc_getattr,
10366         .setattr        = nfs4_proc_setattr,
10367         .lookup         = nfs4_proc_lookup,
10368         .lookupp        = nfs4_proc_lookupp,
10369         .access         = nfs4_proc_access,
10370         .readlink       = nfs4_proc_readlink,
10371         .create         = nfs4_proc_create,
10372         .remove         = nfs4_proc_remove,
10373         .unlink_setup   = nfs4_proc_unlink_setup,
10374         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10375         .unlink_done    = nfs4_proc_unlink_done,
10376         .rename_setup   = nfs4_proc_rename_setup,
10377         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10378         .rename_done    = nfs4_proc_rename_done,
10379         .link           = nfs4_proc_link,
10380         .symlink        = nfs4_proc_symlink,
10381         .mkdir          = nfs4_proc_mkdir,
10382         .rmdir          = nfs4_proc_rmdir,
10383         .readdir        = nfs4_proc_readdir,
10384         .mknod          = nfs4_proc_mknod,
10385         .statfs         = nfs4_proc_statfs,
10386         .fsinfo         = nfs4_proc_fsinfo,
10387         .pathconf       = nfs4_proc_pathconf,
10388         .set_capabilities = nfs4_server_capabilities,
10389         .decode_dirent  = nfs4_decode_dirent,
10390         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10391         .read_setup     = nfs4_proc_read_setup,
10392         .read_done      = nfs4_read_done,
10393         .write_setup    = nfs4_proc_write_setup,
10394         .write_done     = nfs4_write_done,
10395         .commit_setup   = nfs4_proc_commit_setup,
10396         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10397         .commit_done    = nfs4_commit_done,
10398         .lock           = nfs4_proc_lock,
10399         .clear_acl_cache = nfs4_zap_acl_attr,
10400         .close_context  = nfs4_close_context,
10401         .open_context   = nfs4_atomic_open,
10402         .have_delegation = nfs4_have_delegation,
10403         .alloc_client   = nfs4_alloc_client,
10404         .init_client    = nfs4_init_client,
10405         .free_client    = nfs4_free_client,
10406         .create_server  = nfs4_create_server,
10407         .clone_server   = nfs_clone_server,
10408 };
10409
10410 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10411         .name   = XATTR_NAME_NFSV4_ACL,
10412         .list   = nfs4_xattr_list_nfs4_acl,
10413         .get    = nfs4_xattr_get_nfs4_acl,
10414         .set    = nfs4_xattr_set_nfs4_acl,
10415 };
10416
10417 #ifdef CONFIG_NFS_V4_2
10418 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10419         .prefix = XATTR_USER_PREFIX,
10420         .get    = nfs4_xattr_get_nfs4_user,
10421         .set    = nfs4_xattr_set_nfs4_user,
10422 };
10423 #endif
10424
10425 const struct xattr_handler *nfs4_xattr_handlers[] = {
10426         &nfs4_xattr_nfs4_acl_handler,
10427 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10428         &nfs4_xattr_nfs4_label_handler,
10429 #endif
10430 #ifdef CONFIG_NFS_V4_2
10431         &nfs4_xattr_nfs4_user_handler,
10432 #endif
10433         NULL
10434 };
10435
10436 /*
10437  * Local variables:
10438  *  c-basic-offset: 8
10439  * End:
10440  */