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