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 "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69 #include "nfs42.h"
  70
  71 #include "nfs4trace.h"
  72
  73 #define NFSDBG_FACILITY         NFSDBG_PROC
  74
  75 #define NFS4_BITMASK_SZ         3
  76
  77 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  78 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  79
  80 /* file attributes which can be mapped to nfs attributes */
  81 #define NFS4_VALID_ATTRS (ATTR_MODE \
  82         | ATTR_UID \
  83         | ATTR_GID \
  84         | ATTR_SIZE \
  85         | ATTR_ATIME \
  86         | ATTR_MTIME \
  87         | ATTR_CTIME \
  88         | ATTR_ATIME_SET \
  89         | ATTR_MTIME_SET)
  90
  91 struct nfs4_opendata;
  92 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  93 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  94 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  95 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);
  96 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
  97                             struct nfs_fattr *fattr, struct iattr *sattr,
  98                             struct nfs_open_context *ctx, struct nfs4_label *ilabel,
  99                             struct nfs4_label *olabel);
 100 #ifdef CONFIG_NFS_V4_1
 101 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 102                 const struct cred *cred,
 103                 struct nfs4_slot *slot,
 104                 bool is_privileged);
 105 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 106                 const struct cred *);
 107 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 108                 const struct cred *, bool);
 109 #endif
 110
 111 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 112 static inline struct nfs4_label *
 113 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 114         struct iattr *sattr, struct nfs4_label *label)
 115 {
 116         int err;
 117
 118         if (label == NULL)
 119                 return NULL;
 120
 121         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 122                 return NULL;
 123
 124         err = security_dentry_init_security(dentry, sattr->ia_mode,
 125                                 &dentry->d_name, (void **)&label->label, &label->len);
 126         if (err == 0)
 127                 return label;
 128
 129         return NULL;
 130 }
 131 static inline void
 132 nfs4_label_release_security(struct nfs4_label *label)
 133 {
 134         if (label)
 135                 security_release_secctx(label->label, label->len);
 136 }
 137 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 {
 139         if (label)
 140                 return server->attr_bitmask;
 141
 142         return server->attr_bitmask_nl;
 143 }
 144 #else
 145 static inline struct nfs4_label *
 146 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 147         struct iattr *sattr, struct nfs4_label *l)
 148 { return NULL; }
 149 static inline void
 150 nfs4_label_release_security(struct nfs4_label *label)
 151 { return; }
 152 static inline u32 *
 153 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 154 { return server->attr_bitmask; }
 155 #endif
 156
 157 /* Prevent leaks of NFSv4 errors into userland */
 158 static int nfs4_map_errors(int err)
 159 {
 160         if (err >= -1000)
 161                 return err;
 162         switch (err) {
 163         case -NFS4ERR_RESOURCE:
 164         case -NFS4ERR_LAYOUTTRYLATER:
 165         case -NFS4ERR_RECALLCONFLICT:
 166                 return -EREMOTEIO;
 167         case -NFS4ERR_WRONGSEC:
 168         case -NFS4ERR_WRONG_CRED:
 169                 return -EPERM;
 170         case -NFS4ERR_BADOWNER:
 171         case -NFS4ERR_BADNAME:
 172                 return -EINVAL;
 173         case -NFS4ERR_SHARE_DENIED:
 174                 return -EACCES;
 175         case -NFS4ERR_MINOR_VERS_MISMATCH:
 176                 return -EPROTONOSUPPORT;
 177         case -NFS4ERR_FILE_OPEN:
 178                 return -EBUSY;
 179         default:
 180                 dprintk("%s could not handle NFSv4 error %d\n",
 181                                 __func__, -err);
 182                 break;
 183         }
 184         return -EIO;
 185 }
 186
 187 /*
 188  * This is our standard bitmap for GETATTR requests.
 189  */
 190 const u32 nfs4_fattr_bitmap[3] = {
 191         FATTR4_WORD0_TYPE
 192         | FATTR4_WORD0_CHANGE
 193         | FATTR4_WORD0_SIZE
 194         | FATTR4_WORD0_FSID
 195         | FATTR4_WORD0_FILEID,
 196         FATTR4_WORD1_MODE
 197         | FATTR4_WORD1_NUMLINKS
 198         | FATTR4_WORD1_OWNER
 199         | FATTR4_WORD1_OWNER_GROUP
 200         | FATTR4_WORD1_RAWDEV
 201         | FATTR4_WORD1_SPACE_USED
 202         | FATTR4_WORD1_TIME_ACCESS
 203         | FATTR4_WORD1_TIME_METADATA
 204         | FATTR4_WORD1_TIME_MODIFY
 205         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 206 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 207         FATTR4_WORD2_SECURITY_LABEL
 208 #endif
 209 };
 210
 211 static const u32 nfs4_pnfs_open_bitmap[3] = {
 212         FATTR4_WORD0_TYPE
 213         | FATTR4_WORD0_CHANGE
 214         | FATTR4_WORD0_SIZE
 215         | FATTR4_WORD0_FSID
 216         | FATTR4_WORD0_FILEID,
 217         FATTR4_WORD1_MODE
 218         | FATTR4_WORD1_NUMLINKS
 219         | FATTR4_WORD1_OWNER
 220         | FATTR4_WORD1_OWNER_GROUP
 221         | FATTR4_WORD1_RAWDEV
 222         | FATTR4_WORD1_SPACE_USED
 223         | FATTR4_WORD1_TIME_ACCESS
 224         | FATTR4_WORD1_TIME_METADATA
 225         | FATTR4_WORD1_TIME_MODIFY,
 226         FATTR4_WORD2_MDSTHRESHOLD
 227 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 228         | FATTR4_WORD2_SECURITY_LABEL
 229 #endif
 230 };
 231
 232 static const u32 nfs4_open_noattr_bitmap[3] = {
 233         FATTR4_WORD0_TYPE
 234         | FATTR4_WORD0_FILEID,
 235 };
 236
 237 const u32 nfs4_statfs_bitmap[3] = {
 238         FATTR4_WORD0_FILES_AVAIL
 239         | FATTR4_WORD0_FILES_FREE
 240         | FATTR4_WORD0_FILES_TOTAL,
 241         FATTR4_WORD1_SPACE_AVAIL
 242         | FATTR4_WORD1_SPACE_FREE
 243         | FATTR4_WORD1_SPACE_TOTAL
 244 };
 245
 246 const u32 nfs4_pathconf_bitmap[3] = {
 247         FATTR4_WORD0_MAXLINK
 248         | FATTR4_WORD0_MAXNAME,
 249         0
 250 };
 251
 252 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 253                         | FATTR4_WORD0_MAXREAD
 254                         | FATTR4_WORD0_MAXWRITE
 255                         | FATTR4_WORD0_LEASE_TIME,
 256                         FATTR4_WORD1_TIME_DELTA
 257                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 258                         FATTR4_WORD2_LAYOUT_BLKSIZE
 259                         | FATTR4_WORD2_CLONE_BLKSIZE
 260                         | FATTR4_WORD2_XATTR_SUPPORT
 261 };
 262
 263 const u32 nfs4_fs_locations_bitmap[3] = {
 264         FATTR4_WORD0_CHANGE
 265         | FATTR4_WORD0_SIZE
 266         | FATTR4_WORD0_FSID
 267         | FATTR4_WORD0_FILEID
 268         | FATTR4_WORD0_FS_LOCATIONS,
 269         FATTR4_WORD1_OWNER
 270         | FATTR4_WORD1_OWNER_GROUP
 271         | FATTR4_WORD1_RAWDEV
 272         | FATTR4_WORD1_SPACE_USED
 273         | FATTR4_WORD1_TIME_ACCESS
 274         | FATTR4_WORD1_TIME_METADATA
 275         | FATTR4_WORD1_TIME_MODIFY
 276         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 277 };
 278
 279 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 280                 struct inode *inode)
 281 {
 282         unsigned long cache_validity;
 283
 284         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 285         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 286                 return;
 287
 288         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 289         if (!(cache_validity & NFS_INO_REVAL_FORCED))
 290                 cache_validity &= ~(NFS_INO_INVALID_CHANGE
 291                                 | NFS_INO_INVALID_SIZE);
 292
 293         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 294                 dst[0] &= ~FATTR4_WORD0_SIZE;
 295
 296         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 297                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 298 }
 299
 300 static void nfs4_bitmap_copy_adjust_setattr(__u32 *dst,
 301                 const __u32 *src, struct inode *inode)
 302 {
 303         nfs4_bitmap_copy_adjust(dst, src, inode);
 304 }
 305
 306 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 307                 struct nfs4_readdir_arg *readdir)
 308 {
 309         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 310         __be32 *start, *p;
 311
 312         if (cookie > 2) {
 313                 readdir->cookie = cookie;
 314                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 315                 return;
 316         }
 317
 318         readdir->cookie = 0;
 319         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 320         if (cookie == 2)
 321                 return;
 322
 323         /*
 324          * NFSv4 servers do not return entries for '.' and '..'
 325          * Therefore, we fake these entries here.  We let '.'
 326          * have cookie 0 and '..' have cookie 1.  Note that
 327          * when talking to the server, we always send cookie 0
 328          * instead of 1 or 2.
 329          */
 330         start = p = kmap_atomic(*readdir->pages);
 331
 332         if (cookie == 0) {
 333                 *p++ = xdr_one;                                  /* next */
 334                 *p++ = xdr_zero;                   /* cookie, first word */
 335                 *p++ = xdr_one;                   /* cookie, second word */
 336                 *p++ = xdr_one;                             /* entry len */
 337                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 338                 p++;
 339                 *p++ = xdr_one;                         /* bitmap length */
 340                 *p++ = htonl(attrs);                           /* bitmap */
 341                 *p++ = htonl(12);             /* attribute buffer length */
 342                 *p++ = htonl(NF4DIR);
 343                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 344         }
 345
 346         *p++ = xdr_one;                                  /* next */
 347         *p++ = xdr_zero;                   /* cookie, first word */
 348         *p++ = xdr_two;                   /* cookie, second word */
 349         *p++ = xdr_two;                             /* entry len */
 350         memcpy(p, "..\0\0", 4);                         /* entry */
 351         p++;
 352         *p++ = xdr_one;                         /* bitmap length */
 353         *p++ = htonl(attrs);                           /* bitmap */
 354         *p++ = htonl(12);             /* attribute buffer length */
 355         *p++ = htonl(NF4DIR);
 356         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 357
 358         readdir->pgbase = (char *)p - (char *)start;
 359         readdir->count -= readdir->pgbase;
 360         kunmap_atomic(start);
 361 }
 362
 363 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 364                 nfs4_stateid *stateid,
 365                 const struct cred *cred)
 366 {
 367         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 368
 369         ops->test_and_free_expired(server, stateid, cred);
 370 }
 371
 372 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 373                 nfs4_stateid *stateid,
 374                 const struct cred *cred)
 375 {
 376         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 377         nfs4_test_and_free_stateid(server, stateid, cred);
 378 }
 379
 380 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 381                 const nfs4_stateid *stateid,
 382                 const struct cred *cred)
 383 {
 384         nfs4_stateid tmp;
 385
 386         nfs4_stateid_copy(&tmp, stateid);
 387         __nfs4_free_revoked_stateid(server, &tmp, cred);
 388 }
 389
 390 static long nfs4_update_delay(long *timeout)
 391 {
 392         long ret;
 393         if (!timeout)
 394                 return NFS4_POLL_RETRY_MAX;
 395         if (*timeout <= 0)
 396                 *timeout = NFS4_POLL_RETRY_MIN;
 397         if (*timeout > NFS4_POLL_RETRY_MAX)
 398                 *timeout = NFS4_POLL_RETRY_MAX;
 399         ret = *timeout;
 400         *timeout <<= 1;
 401         return ret;
 402 }
 403
 404 static int nfs4_delay_killable(long *timeout)
 405 {
 406         might_sleep();
 407
 408         freezable_schedule_timeout_killable_unsafe(
 409                 nfs4_update_delay(timeout));
 410         if (!__fatal_signal_pending(current))
 411                 return 0;
 412         return -EINTR;
 413 }
 414
 415 static int nfs4_delay_interruptible(long *timeout)
 416 {
 417         might_sleep();
 418
 419         freezable_schedule_timeout_interruptible_unsafe(nfs4_update_delay(timeout));
 420         if (!signal_pending(current))
 421                 return 0;
 422         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 423 }
 424
 425 static int nfs4_delay(long *timeout, bool interruptible)
 426 {
 427         if (interruptible)
 428                 return nfs4_delay_interruptible(timeout);
 429         return nfs4_delay_killable(timeout);
 430 }
 431
 432 static const nfs4_stateid *
 433 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 434 {
 435         if (!stateid)
 436                 return NULL;
 437         switch (stateid->type) {
 438         case NFS4_OPEN_STATEID_TYPE:
 439         case NFS4_LOCK_STATEID_TYPE:
 440         case NFS4_DELEGATION_STATEID_TYPE:
 441                 return stateid;
 442         default:
 443                 break;
 444         }
 445         return NULL;
 446 }
 447
 448 /* This is the error handling routine for processes that are allowed
 449  * to sleep.
 450  */
 451 static int nfs4_do_handle_exception(struct nfs_server *server,
 452                 int errorcode, struct nfs4_exception *exception)
 453 {
 454         struct nfs_client *clp = server->nfs_client;
 455         struct nfs4_state *state = exception->state;
 456         const nfs4_stateid *stateid;
 457         struct inode *inode = exception->inode;
 458         int ret = errorcode;
 459
 460         exception->delay = 0;
 461         exception->recovering = 0;
 462         exception->retry = 0;
 463
 464         stateid = nfs4_recoverable_stateid(exception->stateid);
 465         if (stateid == NULL && state != NULL)
 466                 stateid = nfs4_recoverable_stateid(&state->stateid);
 467
 468         switch(errorcode) {
 469                 case 0:
 470                         return 0;
 471                 case -NFS4ERR_BADHANDLE:
 472                 case -ESTALE:
 473                         if (inode != NULL && S_ISREG(inode->i_mode))
 474                                 pnfs_destroy_layout(NFS_I(inode));
 475                         break;
 476                 case -NFS4ERR_DELEG_REVOKED:
 477                 case -NFS4ERR_ADMIN_REVOKED:
 478                 case -NFS4ERR_EXPIRED:
 479                 case -NFS4ERR_BAD_STATEID:
 480                 case -NFS4ERR_PARTNER_NO_AUTH:
 481                         if (inode != NULL && stateid != NULL) {
 482                                 nfs_inode_find_state_and_recover(inode,
 483                                                 stateid);
 484                                 goto wait_on_recovery;
 485                         }
 486                         fallthrough;
 487                 case -NFS4ERR_OPENMODE:
 488                         if (inode) {
 489                                 int err;
 490
 491                                 err = nfs_async_inode_return_delegation(inode,
 492                                                 stateid);
 493                                 if (err == 0)
 494                                         goto wait_on_recovery;
 495                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 496                                         exception->retry = 1;
 497                                         break;
 498                                 }
 499                         }
 500                         if (state == NULL)
 501                                 break;
 502                         ret = nfs4_schedule_stateid_recovery(server, state);
 503                         if (ret < 0)
 504                                 break;
 505                         goto wait_on_recovery;
 506                 case -NFS4ERR_STALE_STATEID:
 507                 case -NFS4ERR_STALE_CLIENTID:
 508                         nfs4_schedule_lease_recovery(clp);
 509                         goto wait_on_recovery;
 510                 case -NFS4ERR_MOVED:
 511                         ret = nfs4_schedule_migration_recovery(server);
 512                         if (ret < 0)
 513                                 break;
 514                         goto wait_on_recovery;
 515                 case -NFS4ERR_LEASE_MOVED:
 516                         nfs4_schedule_lease_moved_recovery(clp);
 517                         goto wait_on_recovery;
 518 #if defined(CONFIG_NFS_V4_1)
 519                 case -NFS4ERR_BADSESSION:
 520                 case -NFS4ERR_BADSLOT:
 521                 case -NFS4ERR_BAD_HIGH_SLOT:
 522                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 523                 case -NFS4ERR_DEADSESSION:
 524                 case -NFS4ERR_SEQ_FALSE_RETRY:
 525                 case -NFS4ERR_SEQ_MISORDERED:
 526                         /* Handled in nfs41_sequence_process() */
 527                         goto wait_on_recovery;
 528 #endif /* defined(CONFIG_NFS_V4_1) */
 529                 case -NFS4ERR_FILE_OPEN:
 530                         if (exception->timeout > HZ) {
 531                                 /* We have retried a decent amount, time to
 532                                  * fail
 533                                  */
 534                                 ret = -EBUSY;
 535                                 break;
 536                         }
 537                         fallthrough;
 538                 case -NFS4ERR_DELAY:
 539                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 540                         fallthrough;
 541                 case -NFS4ERR_GRACE:
 542                 case -NFS4ERR_LAYOUTTRYLATER:
 543                 case -NFS4ERR_RECALLCONFLICT:
 544                         exception->delay = 1;
 545                         return 0;
 546
 547                 case -NFS4ERR_RETRY_UNCACHED_REP:
 548                 case -NFS4ERR_OLD_STATEID:
 549                         exception->retry = 1;
 550                         break;
 551                 case -NFS4ERR_BADOWNER:
 552                         /* The following works around a Linux server bug! */
 553                 case -NFS4ERR_BADNAME:
 554                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 555                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 556                                 exception->retry = 1;
 557                                 printk(KERN_WARNING "NFS: v4 server %s "
 558                                                 "does not accept raw "
 559                                                 "uid/gids. "
 560                                                 "Reenabling the idmapper.\n",
 561                                                 server->nfs_client->cl_hostname);
 562                         }
 563         }
 564         /* We failed to handle the error */
 565         return nfs4_map_errors(ret);
 566 wait_on_recovery:
 567         exception->recovering = 1;
 568         return 0;
 569 }
 570
 571 /* This is the error handling routine for processes that are allowed
 572  * to sleep.
 573  */
 574 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 575 {
 576         struct nfs_client *clp = server->nfs_client;
 577         int ret;
 578
 579         ret = nfs4_do_handle_exception(server, errorcode, exception);
 580         if (exception->delay) {
 581                 ret = nfs4_delay(&exception->timeout,
 582                                 exception->interruptible);
 583                 goto out_retry;
 584         }
 585         if (exception->recovering) {
 586                 ret = nfs4_wait_clnt_recover(clp);
 587                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 588                         return -EIO;
 589                 goto out_retry;
 590         }
 591         return ret;
 592 out_retry:
 593         if (ret == 0)
 594                 exception->retry = 1;
 595         return ret;
 596 }
 597
 598 static int
 599 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 600                 int errorcode, struct nfs4_exception *exception)
 601 {
 602         struct nfs_client *clp = server->nfs_client;
 603         int ret;
 604
 605         ret = nfs4_do_handle_exception(server, errorcode, exception);
 606         if (exception->delay) {
 607                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 608                 goto out_retry;
 609         }
 610         if (exception->recovering) {
 611                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 612                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 613                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 614                 goto out_retry;
 615         }
 616         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 617                 ret = -EIO;
 618         return ret;
 619 out_retry:
 620         if (ret == 0) {
 621                 exception->retry = 1;
 622                 /*
 623                  * For NFS4ERR_MOVED, the client transport will need to
 624                  * be recomputed after migration recovery has completed.
 625                  */
 626                 if (errorcode == -NFS4ERR_MOVED)
 627                         rpc_task_release_transport(task);
 628         }
 629         return ret;
 630 }
 631
 632 int
 633 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 634                         struct nfs4_state *state, long *timeout)
 635 {
 636         struct nfs4_exception exception = {
 637                 .state = state,
 638         };
 639
 640         if (task->tk_status >= 0)
 641                 return 0;
 642         if (timeout)
 643                 exception.timeout = *timeout;
 644         task->tk_status = nfs4_async_handle_exception(task, server,
 645                         task->tk_status,
 646                         &exception);
 647         if (exception.delay && timeout)
 648                 *timeout = exception.timeout;
 649         if (exception.retry)
 650                 return -EAGAIN;
 651         return 0;
 652 }
 653
 654 /*
 655  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 656  * or 'false' otherwise.
 657  */
 658 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 659 {
 660         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 661         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 662 }
 663
 664 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 665 {
 666         spin_lock(&clp->cl_lock);
 667         if (time_before(clp->cl_last_renewal,timestamp))
 668                 clp->cl_last_renewal = timestamp;
 669         spin_unlock(&clp->cl_lock);
 670 }
 671
 672 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 673 {
 674         struct nfs_client *clp = server->nfs_client;
 675
 676         if (!nfs4_has_session(clp))
 677                 do_renew_lease(clp, timestamp);
 678 }
 679
 680 struct nfs4_call_sync_data {
 681         const struct nfs_server *seq_server;
 682         struct nfs4_sequence_args *seq_args;
 683         struct nfs4_sequence_res *seq_res;
 684 };
 685
 686 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 687                         struct nfs4_sequence_res *res, int cache_reply,
 688                         int privileged)
 689 {
 690         args->sa_slot = NULL;
 691         args->sa_cache_this = cache_reply;
 692         args->sa_privileged = privileged;
 693
 694         res->sr_slot = NULL;
 695 }
 696
 697 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 698 {
 699         struct nfs4_slot *slot = res->sr_slot;
 700         struct nfs4_slot_table *tbl;
 701
 702         tbl = slot->table;
 703         spin_lock(&tbl->slot_tbl_lock);
 704         if (!nfs41_wake_and_assign_slot(tbl, slot))
 705                 nfs4_free_slot(tbl, slot);
 706         spin_unlock(&tbl->slot_tbl_lock);
 707
 708         res->sr_slot = NULL;
 709 }
 710
 711 static int nfs40_sequence_done(struct rpc_task *task,
 712                                struct nfs4_sequence_res *res)
 713 {
 714         if (res->sr_slot != NULL)
 715                 nfs40_sequence_free_slot(res);
 716         return 1;
 717 }
 718
 719 #if defined(CONFIG_NFS_V4_1)
 720
 721 static void nfs41_release_slot(struct nfs4_slot *slot)
 722 {
 723         struct nfs4_session *session;
 724         struct nfs4_slot_table *tbl;
 725         bool send_new_highest_used_slotid = false;
 726
 727         if (!slot)
 728                 return;
 729         tbl = slot->table;
 730         session = tbl->session;
 731
 732         /* Bump the slot sequence number */
 733         if (slot->seq_done)
 734                 slot->seq_nr++;
 735         slot->seq_done = 0;
 736
 737         spin_lock(&tbl->slot_tbl_lock);
 738         /* Be nice to the server: try to ensure that the last transmitted
 739          * value for highest_user_slotid <= target_highest_slotid
 740          */
 741         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 742                 send_new_highest_used_slotid = true;
 743
 744         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 745                 send_new_highest_used_slotid = false;
 746                 goto out_unlock;
 747         }
 748         nfs4_free_slot(tbl, slot);
 749
 750         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 751                 send_new_highest_used_slotid = false;
 752 out_unlock:
 753         spin_unlock(&tbl->slot_tbl_lock);
 754         if (send_new_highest_used_slotid)
 755                 nfs41_notify_server(session->clp);
 756         if (waitqueue_active(&tbl->slot_waitq))
 757                 wake_up_all(&tbl->slot_waitq);
 758 }
 759
 760 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 761 {
 762         nfs41_release_slot(res->sr_slot);
 763         res->sr_slot = NULL;
 764 }
 765
 766 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 767                 u32 seqnr)
 768 {
 769         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 770                 slot->seq_nr_highest_sent = seqnr;
 771 }
 772 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot,
 773                 u32 seqnr)
 774 {
 775         slot->seq_nr_highest_sent = seqnr;
 776         slot->seq_nr_last_acked = seqnr;
 777 }
 778
 779 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 780                                 struct nfs4_slot *slot)
 781 {
 782         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 783         if (!IS_ERR(task))
 784                 rpc_put_task_async(task);
 785 }
 786
 787 static int nfs41_sequence_process(struct rpc_task *task,
 788                 struct nfs4_sequence_res *res)
 789 {
 790         struct nfs4_session *session;
 791         struct nfs4_slot *slot = res->sr_slot;
 792         struct nfs_client *clp;
 793         int status;
 794         int ret = 1;
 795
 796         if (slot == NULL)
 797                 goto out_noaction;
 798         /* don't increment the sequence number if the task wasn't sent */
 799         if (!RPC_WAS_SENT(task) || slot->seq_done)
 800                 goto out;
 801
 802         session = slot->table->session;
 803         clp = session->clp;
 804
 805         trace_nfs4_sequence_done(session, res);
 806
 807         status = res->sr_status;
 808         if (task->tk_status == -NFS4ERR_DEADSESSION)
 809                 status = -NFS4ERR_DEADSESSION;
 810
 811         /* Check the SEQUENCE operation status */
 812         switch (status) {
 813         case 0:
 814                 /* Mark this sequence number as having been acked */
 815                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 816                 /* Update the slot's sequence and clientid lease timer */
 817                 slot->seq_done = 1;
 818                 do_renew_lease(clp, res->sr_timestamp);
 819                 /* Check sequence flags */
 820                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 821                                 !!slot->privileged);
 822                 nfs41_update_target_slotid(slot->table, slot, res);
 823                 break;
 824         case 1:
 825                 /*
 826                  * sr_status remains 1 if an RPC level error occurred.
 827                  * The server may or may not have processed the sequence
 828                  * operation..
 829                  */
 830                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 831                 slot->seq_done = 1;
 832                 goto out;
 833         case -NFS4ERR_DELAY:
 834                 /* The server detected a resend of the RPC call and
 835                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 836                  * of RFC5661.
 837                  */
 838                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 839                         __func__,
 840                         slot->slot_nr,
 841                         slot->seq_nr);
 842                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 843                 goto out_retry;
 844         case -NFS4ERR_RETRY_UNCACHED_REP:
 845         case -NFS4ERR_SEQ_FALSE_RETRY:
 846                 /*
 847                  * The server thinks we tried to replay a request.
 848                  * Retry the call after bumping the sequence ID.
 849                  */
 850                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 851                 goto retry_new_seq;
 852         case -NFS4ERR_BADSLOT:
 853                 /*
 854                  * The slot id we used was probably retired. Try again
 855                  * using a different slot id.
 856                  */
 857                 if (slot->slot_nr < slot->table->target_highest_slotid)
 858                         goto session_recover;
 859                 goto retry_nowait;
 860         case -NFS4ERR_SEQ_MISORDERED:
 861                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 862                 /*
 863                  * Were one or more calls using this slot interrupted?
 864                  * If the server never received the request, then our
 865                  * transmitted slot sequence number may be too high. However,
 866                  * if the server did receive the request then it might
 867                  * accidentally give us a reply with a mismatched operation.
 868                  * We can sort this out by sending a lone sequence operation
 869                  * to the server on the same slot.
 870                  */
 871                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 872                         slot->seq_nr--;
 873                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 874                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 875                                 res->sr_slot = NULL;
 876                         }
 877                         goto retry_nowait;
 878                 }
 879                 /*
 880                  * RFC5661:
 881                  * A retry might be sent while the original request is
 882                  * still in progress on the replier. The replier SHOULD
 883                  * deal with the issue by returning NFS4ERR_DELAY as the
 884                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 885                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 886                  *
 887                  * Restart the search after a delay.
 888                  */
 889                 slot->seq_nr = slot->seq_nr_highest_sent;
 890                 goto out_retry;
 891         case -NFS4ERR_BADSESSION:
 892         case -NFS4ERR_DEADSESSION:
 893         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 894                 goto session_recover;
 895         default:
 896                 /* Just update the slot sequence no. */
 897                 slot->seq_done = 1;
 898         }
 899 out:
 900         /* The session may be reset by one of the error handlers. */
 901         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 902 out_noaction:
 903         return ret;
 904 session_recover:
 905         nfs4_schedule_session_recovery(session, status);
 906         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 907         nfs41_sequence_free_slot(res);
 908         goto out;
 909 retry_new_seq:
 910         ++slot->seq_nr;
 911 retry_nowait:
 912         if (rpc_restart_call_prepare(task)) {
 913                 nfs41_sequence_free_slot(res);
 914                 task->tk_status = 0;
 915                 ret = 0;
 916         }
 917         goto out;
 918 out_retry:
 919         if (!rpc_restart_call(task))
 920                 goto out;
 921         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 922         return 0;
 923 }
 924
 925 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 926 {
 927         if (!nfs41_sequence_process(task, res))
 928                 return 0;
 929         if (res->sr_slot != NULL)
 930                 nfs41_sequence_free_slot(res);
 931         return 1;
 932
 933 }
 934 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 935
 936 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 937 {
 938         if (res->sr_slot == NULL)
 939                 return 1;
 940         if (res->sr_slot->table->session != NULL)
 941                 return nfs41_sequence_process(task, res);
 942         return nfs40_sequence_done(task, res);
 943 }
 944
 945 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 946 {
 947         if (res->sr_slot != NULL) {
 948                 if (res->sr_slot->table->session != NULL)
 949                         nfs41_sequence_free_slot(res);
 950                 else
 951                         nfs40_sequence_free_slot(res);
 952         }
 953 }
 954
 955 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 956 {
 957         if (res->sr_slot == NULL)
 958                 return 1;
 959         if (!res->sr_slot->table->session)
 960                 return nfs40_sequence_done(task, res);
 961         return nfs41_sequence_done(task, res);
 962 }
 963 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 964
 965 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 966 {
 967         struct nfs4_call_sync_data *data = calldata;
 968
 969         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 970
 971         nfs4_setup_sequence(data->seq_server->nfs_client,
 972                             data->seq_args, data->seq_res, task);
 973 }
 974
 975 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 976 {
 977         struct nfs4_call_sync_data *data = calldata;
 978
 979         nfs41_sequence_done(task, data->seq_res);
 980 }
 981
 982 static const struct rpc_call_ops nfs41_call_sync_ops = {
 983         .rpc_call_prepare = nfs41_call_sync_prepare,
 984         .rpc_call_done = nfs41_call_sync_done,
 985 };
 986
 987 #else   /* !CONFIG_NFS_V4_1 */
 988
 989 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 990 {
 991         return nfs40_sequence_done(task, res);
 992 }
 993
 994 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 995 {
 996         if (res->sr_slot != NULL)
 997                 nfs40_sequence_free_slot(res);
 998 }
 999
1000 int nfs4_sequence_done(struct rpc_task *task,
1001                        struct nfs4_sequence_res *res)
1002 {
1003         return nfs40_sequence_done(task, res);
1004 }
1005 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1006
1007 #endif  /* !CONFIG_NFS_V4_1 */
1008
1009 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1010 {
1011         res->sr_timestamp = jiffies;
1012         res->sr_status_flags = 0;
1013         res->sr_status = 1;
1014 }
1015
1016 static
1017 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1018                 struct nfs4_sequence_res *res,
1019                 struct nfs4_slot *slot)
1020 {
1021         if (!slot)
1022                 return;
1023         slot->privileged = args->sa_privileged ? 1 : 0;
1024         args->sa_slot = slot;
1025
1026         res->sr_slot = slot;
1027 }
1028
1029 int nfs4_setup_sequence(struct nfs_client *client,
1030                         struct nfs4_sequence_args *args,
1031                         struct nfs4_sequence_res *res,
1032                         struct rpc_task *task)
1033 {
1034         struct nfs4_session *session = nfs4_get_session(client);
1035         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1036         struct nfs4_slot *slot;
1037
1038         /* slot already allocated? */
1039         if (res->sr_slot != NULL)
1040                 goto out_start;
1041
1042         if (session)
1043                 tbl = &session->fc_slot_table;
1044
1045         spin_lock(&tbl->slot_tbl_lock);
1046         /* The state manager will wait until the slot table is empty */
1047         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1048                 goto out_sleep;
1049
1050         slot = nfs4_alloc_slot(tbl);
1051         if (IS_ERR(slot)) {
1052                 if (slot == ERR_PTR(-ENOMEM))
1053                         goto out_sleep_timeout;
1054                 goto out_sleep;
1055         }
1056         spin_unlock(&tbl->slot_tbl_lock);
1057
1058         nfs4_sequence_attach_slot(args, res, slot);
1059
1060         trace_nfs4_setup_sequence(session, args);
1061 out_start:
1062         nfs41_sequence_res_init(res);
1063         rpc_call_start(task);
1064         return 0;
1065 out_sleep_timeout:
1066         /* Try again in 1/4 second */
1067         if (args->sa_privileged)
1068                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1069                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1070         else
1071                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1072                                 NULL, jiffies + (HZ >> 2));
1073         spin_unlock(&tbl->slot_tbl_lock);
1074         return -EAGAIN;
1075 out_sleep:
1076         if (args->sa_privileged)
1077                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1078                                 RPC_PRIORITY_PRIVILEGED);
1079         else
1080                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1081         spin_unlock(&tbl->slot_tbl_lock);
1082         return -EAGAIN;
1083 }
1084 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1085
1086 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1087 {
1088         struct nfs4_call_sync_data *data = calldata;
1089         nfs4_setup_sequence(data->seq_server->nfs_client,
1090                                 data->seq_args, data->seq_res, task);
1091 }
1092
1093 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1094 {
1095         struct nfs4_call_sync_data *data = calldata;
1096         nfs4_sequence_done(task, data->seq_res);
1097 }
1098
1099 static const struct rpc_call_ops nfs40_call_sync_ops = {
1100         .rpc_call_prepare = nfs40_call_sync_prepare,
1101         .rpc_call_done = nfs40_call_sync_done,
1102 };
1103
1104 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1105 {
1106         int ret;
1107         struct rpc_task *task;
1108
1109         task = rpc_run_task(task_setup);
1110         if (IS_ERR(task))
1111                 return PTR_ERR(task);
1112
1113         ret = task->tk_status;
1114         rpc_put_task(task);
1115         return ret;
1116 }
1117
1118 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1119                              struct nfs_server *server,
1120                              struct rpc_message *msg,
1121                              struct nfs4_sequence_args *args,
1122                              struct nfs4_sequence_res *res,
1123                              unsigned short task_flags)
1124 {
1125         struct nfs_client *clp = server->nfs_client;
1126         struct nfs4_call_sync_data data = {
1127                 .seq_server = server,
1128                 .seq_args = args,
1129                 .seq_res = res,
1130         };
1131         struct rpc_task_setup task_setup = {
1132                 .rpc_client = clnt,
1133                 .rpc_message = msg,
1134                 .callback_ops = clp->cl_mvops->call_sync_ops,
1135                 .callback_data = &data,
1136                 .flags = task_flags,
1137         };
1138
1139         return nfs4_call_sync_custom(&task_setup);
1140 }
1141
1142 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1143                                    struct nfs_server *server,
1144                                    struct rpc_message *msg,
1145                                    struct nfs4_sequence_args *args,
1146                                    struct nfs4_sequence_res *res)
1147 {
1148         return nfs4_do_call_sync(clnt, server, msg, args, res, 0);
1149 }
1150
1151
1152 int nfs4_call_sync(struct rpc_clnt *clnt,
1153                    struct nfs_server *server,
1154                    struct rpc_message *msg,
1155                    struct nfs4_sequence_args *args,
1156                    struct nfs4_sequence_res *res,
1157                    int cache_reply)
1158 {
1159         nfs4_init_sequence(args, res, cache_reply, 0);
1160         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1161 }
1162
1163 static void
1164 nfs4_inc_nlink_locked(struct inode *inode)
1165 {
1166         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1167         inc_nlink(inode);
1168 }
1169
1170 static void
1171 nfs4_dec_nlink_locked(struct inode *inode)
1172 {
1173         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1174         drop_nlink(inode);
1175 }
1176
1177 static void
1178 nfs4_update_changeattr_locked(struct inode *inode,
1179                 struct nfs4_change_info *cinfo,
1180                 unsigned long timestamp, unsigned long cache_validity)
1181 {
1182         struct nfs_inode *nfsi = NFS_I(inode);
1183
1184         nfsi->cache_validity |= NFS_INO_INVALID_CTIME
1185                 | NFS_INO_INVALID_MTIME
1186                 | cache_validity;
1187
1188         if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(inode)) {
1189                 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1190                 nfsi->attrtimeo_timestamp = jiffies;
1191         } else {
1192                 if (S_ISDIR(inode->i_mode)) {
1193                         nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1194                         nfs_force_lookup_revalidate(inode);
1195                 } else {
1196                         if (!NFS_PROTO(inode)->have_delegation(inode,
1197                                                                FMODE_READ))
1198                                 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE;
1199                 }
1200
1201                 if (cinfo->before != inode_peek_iversion_raw(inode))
1202                         nfsi->cache_validity |= NFS_INO_INVALID_ACCESS |
1203                                                 NFS_INO_INVALID_ACL |
1204                                                 NFS_INO_INVALID_XATTR;
1205         }
1206         inode_set_iversion_raw(inode, cinfo->after);
1207         nfsi->read_cache_jiffies = timestamp;
1208         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1209         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1210
1211         if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1212                 nfs_fscache_invalidate(inode);
1213 }
1214
1215 void
1216 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1217                 unsigned long timestamp, unsigned long cache_validity)
1218 {
1219         spin_lock(&dir->i_lock);
1220         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1221         spin_unlock(&dir->i_lock);
1222 }
1223
1224 struct nfs4_open_createattrs {
1225         struct nfs4_label *label;
1226         struct iattr *sattr;
1227         const __u32 verf[2];
1228 };
1229
1230 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1231                 int err, struct nfs4_exception *exception)
1232 {
1233         if (err != -EINVAL)
1234                 return false;
1235         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1236                 return false;
1237         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1238         exception->retry = 1;
1239         return true;
1240 }
1241
1242 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1243 {
1244          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1245 }
1246
1247 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1248 {
1249         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1250
1251         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1252 }
1253
1254 static u32
1255 nfs4_map_atomic_open_share(struct nfs_server *server,
1256                 fmode_t fmode, int openflags)
1257 {
1258         u32 res = 0;
1259
1260         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1261         case FMODE_READ:
1262                 res = NFS4_SHARE_ACCESS_READ;
1263                 break;
1264         case FMODE_WRITE:
1265                 res = NFS4_SHARE_ACCESS_WRITE;
1266                 break;
1267         case FMODE_READ|FMODE_WRITE:
1268                 res = NFS4_SHARE_ACCESS_BOTH;
1269         }
1270         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1271                 goto out;
1272         /* Want no delegation if we're using O_DIRECT */
1273         if (openflags & O_DIRECT)
1274                 res |= NFS4_SHARE_WANT_NO_DELEG;
1275 out:
1276         return res;
1277 }
1278
1279 static enum open_claim_type4
1280 nfs4_map_atomic_open_claim(struct nfs_server *server,
1281                 enum open_claim_type4 claim)
1282 {
1283         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1284                 return claim;
1285         switch (claim) {
1286         default:
1287                 return claim;
1288         case NFS4_OPEN_CLAIM_FH:
1289                 return NFS4_OPEN_CLAIM_NULL;
1290         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1291                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1292         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1293                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1294         }
1295 }
1296
1297 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1298 {
1299         p->o_res.f_attr = &p->f_attr;
1300         p->o_res.f_label = p->f_label;
1301         p->o_res.seqid = p->o_arg.seqid;
1302         p->c_res.seqid = p->c_arg.seqid;
1303         p->o_res.server = p->o_arg.server;
1304         p->o_res.access_request = p->o_arg.access;
1305         nfs_fattr_init(&p->f_attr);
1306         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1307 }
1308
1309 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1310                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1311                 const struct nfs4_open_createattrs *c,
1312                 enum open_claim_type4 claim,
1313                 gfp_t gfp_mask)
1314 {
1315         struct dentry *parent = dget_parent(dentry);
1316         struct inode *dir = d_inode(parent);
1317         struct nfs_server *server = NFS_SERVER(dir);
1318         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1319         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1320         struct nfs4_opendata *p;
1321
1322         p = kzalloc(sizeof(*p), gfp_mask);
1323         if (p == NULL)
1324                 goto err;
1325
1326         p->f_label = nfs4_label_alloc(server, gfp_mask);
1327         if (IS_ERR(p->f_label))
1328                 goto err_free_p;
1329
1330         p->a_label = nfs4_label_alloc(server, gfp_mask);
1331         if (IS_ERR(p->a_label))
1332                 goto err_free_f;
1333
1334         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1335         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1336         if (IS_ERR(p->o_arg.seqid))
1337                 goto err_free_label;
1338         nfs_sb_active(dentry->d_sb);
1339         p->dentry = dget(dentry);
1340         p->dir = parent;
1341         p->owner = sp;
1342         atomic_inc(&sp->so_count);
1343         p->o_arg.open_flags = flags;
1344         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1345         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1346         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1347                         fmode, flags);
1348         if (flags & O_CREAT) {
1349                 p->o_arg.umask = current_umask();
1350                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1351                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1352                         p->o_arg.u.attrs = &p->attrs;
1353                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1354
1355                         memcpy(p->o_arg.u.verifier.data, c->verf,
1356                                         sizeof(p->o_arg.u.verifier.data));
1357                 }
1358         }
1359         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1360          * will return permission denied for all bits until close */
1361         if (!(flags & O_EXCL)) {
1362                 /* ask server to check for all possible rights as results
1363                  * are cached */
1364                 switch (p->o_arg.claim) {
1365                 default:
1366                         break;
1367                 case NFS4_OPEN_CLAIM_NULL:
1368                 case NFS4_OPEN_CLAIM_FH:
1369                         p->o_arg.access = NFS4_ACCESS_READ |
1370                                 NFS4_ACCESS_MODIFY |
1371                                 NFS4_ACCESS_EXTEND |
1372                                 NFS4_ACCESS_EXECUTE;
1373 #ifdef CONFIG_NFS_V4_2
1374                         if (server->caps & NFS_CAP_XATTR)
1375                                 p->o_arg.access |= NFS4_ACCESS_XAREAD |
1376                                     NFS4_ACCESS_XAWRITE |
1377                                     NFS4_ACCESS_XALIST;
1378 #endif
1379                 }
1380         }
1381         p->o_arg.clientid = server->nfs_client->cl_clientid;
1382         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1383         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1384         p->o_arg.name = &dentry->d_name;
1385         p->o_arg.server = server;
1386         p->o_arg.bitmask = nfs4_bitmask(server, label);
1387         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1388         switch (p->o_arg.claim) {
1389         case NFS4_OPEN_CLAIM_NULL:
1390         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1391         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1392                 p->o_arg.fh = NFS_FH(dir);
1393                 break;
1394         case NFS4_OPEN_CLAIM_PREVIOUS:
1395         case NFS4_OPEN_CLAIM_FH:
1396         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1397         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1398                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1399         }
1400         p->c_arg.fh = &p->o_res.fh;
1401         p->c_arg.stateid = &p->o_res.stateid;
1402         p->c_arg.seqid = p->o_arg.seqid;
1403         nfs4_init_opendata_res(p);
1404         kref_init(&p->kref);
1405         return p;
1406
1407 err_free_label:
1408         nfs4_label_free(p->a_label);
1409 err_free_f:
1410         nfs4_label_free(p->f_label);
1411 err_free_p:
1412         kfree(p);
1413 err:
1414         dput(parent);
1415         return NULL;
1416 }
1417
1418 static void nfs4_opendata_free(struct kref *kref)
1419 {
1420         struct nfs4_opendata *p = container_of(kref,
1421                         struct nfs4_opendata, kref);
1422         struct super_block *sb = p->dentry->d_sb;
1423
1424         nfs4_lgopen_release(p->lgp);
1425         nfs_free_seqid(p->o_arg.seqid);
1426         nfs4_sequence_free_slot(&p->o_res.seq_res);
1427         if (p->state != NULL)
1428                 nfs4_put_open_state(p->state);
1429         nfs4_put_state_owner(p->owner);
1430
1431         nfs4_label_free(p->a_label);
1432         nfs4_label_free(p->f_label);
1433
1434         dput(p->dir);
1435         dput(p->dentry);
1436         nfs_sb_deactive(sb);
1437         nfs_fattr_free_names(&p->f_attr);
1438         kfree(p->f_attr.mdsthreshold);
1439         kfree(p);
1440 }
1441
1442 static void nfs4_opendata_put(struct nfs4_opendata *p)
1443 {
1444         if (p != NULL)
1445                 kref_put(&p->kref, nfs4_opendata_free);
1446 }
1447
1448 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1449                 fmode_t fmode)
1450 {
1451         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1452         case FMODE_READ|FMODE_WRITE:
1453                 return state->n_rdwr != 0;
1454         case FMODE_WRITE:
1455                 return state->n_wronly != 0;
1456         case FMODE_READ:
1457                 return state->n_rdonly != 0;
1458         }
1459         WARN_ON_ONCE(1);
1460         return false;
1461 }
1462
1463 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1464                 int open_mode, enum open_claim_type4 claim)
1465 {
1466         int ret = 0;
1467
1468         if (open_mode & (O_EXCL|O_TRUNC))
1469                 goto out;
1470         switch (claim) {
1471         case NFS4_OPEN_CLAIM_NULL:
1472         case NFS4_OPEN_CLAIM_FH:
1473                 goto out;
1474         default:
1475                 break;
1476         }
1477         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1478                 case FMODE_READ:
1479                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1480                                 && state->n_rdonly != 0;
1481                         break;
1482                 case FMODE_WRITE:
1483                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1484                                 && state->n_wronly != 0;
1485                         break;
1486                 case FMODE_READ|FMODE_WRITE:
1487                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1488                                 && state->n_rdwr != 0;
1489         }
1490 out:
1491         return ret;
1492 }
1493
1494 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1495                 enum open_claim_type4 claim)
1496 {
1497         if (delegation == NULL)
1498                 return 0;
1499         if ((delegation->type & fmode) != fmode)
1500                 return 0;
1501         switch (claim) {
1502         case NFS4_OPEN_CLAIM_NULL:
1503         case NFS4_OPEN_CLAIM_FH:
1504                 break;
1505         case NFS4_OPEN_CLAIM_PREVIOUS:
1506                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1507                         break;
1508                 fallthrough;
1509         default:
1510                 return 0;
1511         }
1512         nfs_mark_delegation_referenced(delegation);
1513         return 1;
1514 }
1515
1516 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1517 {
1518         switch (fmode) {
1519                 case FMODE_WRITE:
1520                         state->n_wronly++;
1521                         break;
1522                 case FMODE_READ:
1523                         state->n_rdonly++;
1524                         break;
1525                 case FMODE_READ|FMODE_WRITE:
1526                         state->n_rdwr++;
1527         }
1528         nfs4_state_set_mode_locked(state, state->state | fmode);
1529 }
1530
1531 #ifdef CONFIG_NFS_V4_1
1532 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1533 {
1534         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1535                 return true;
1536         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1537                 return true;
1538         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1539                 return true;
1540         return false;
1541 }
1542 #endif /* CONFIG_NFS_V4_1 */
1543
1544 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1545 {
1546         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1547                 wake_up_all(&state->waitq);
1548 }
1549
1550 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state,
1551                 const nfs4_stateid *stateid)
1552 {
1553         u32 state_seqid = be32_to_cpu(state->open_stateid.seqid);
1554         u32 stateid_seqid = be32_to_cpu(stateid->seqid);
1555
1556         if (stateid_seqid == state_seqid + 1U ||
1557             (stateid_seqid == 1U && state_seqid == 0xffffffffU))
1558                 nfs_state_log_update_open_stateid(state);
1559         else
1560                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1561 }
1562
1563 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1564 {
1565         struct nfs_client *clp = state->owner->so_server->nfs_client;
1566         bool need_recover = false;
1567
1568         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1569                 need_recover = true;
1570         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1571                 need_recover = true;
1572         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1573                 need_recover = true;
1574         if (need_recover)
1575                 nfs4_state_mark_reclaim_nograce(clp, state);
1576 }
1577
1578 /*
1579  * Check for whether or not the caller may update the open stateid
1580  * to the value passed in by stateid.
1581  *
1582  * Note: This function relies heavily on the server implementing
1583  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1584  * correctly.
1585  * i.e. The stateid seqids have to be initialised to 1, and
1586  * are then incremented on every state transition.
1587  */
1588 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1589                 const nfs4_stateid *stateid)
1590 {
1591         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 ||
1592             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1593                 if (stateid->seqid == cpu_to_be32(1))
1594                         nfs_state_log_update_open_stateid(state);
1595                 else
1596                         set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1597                 return true;
1598         }
1599
1600         if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1601                 nfs_state_log_out_of_order_open_stateid(state, stateid);
1602                 return true;
1603         }
1604         return false;
1605 }
1606
1607 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1608 {
1609         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1610                 return;
1611         if (state->n_wronly)
1612                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1613         if (state->n_rdonly)
1614                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1615         if (state->n_rdwr)
1616                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1617         set_bit(NFS_OPEN_STATE, &state->flags);
1618 }
1619
1620 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1621                 nfs4_stateid *stateid, fmode_t fmode)
1622 {
1623         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1624         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1625         case FMODE_WRITE:
1626                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1627                 break;
1628         case FMODE_READ:
1629                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1630                 break;
1631         case 0:
1632                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1633                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1634                 clear_bit(NFS_OPEN_STATE, &state->flags);
1635         }
1636         if (stateid == NULL)
1637                 return;
1638         /* Handle OPEN+OPEN_DOWNGRADE races */
1639         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1640             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1641                 nfs_resync_open_stateid_locked(state);
1642                 goto out;
1643         }
1644         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1645                 nfs4_stateid_copy(&state->stateid, stateid);
1646         nfs4_stateid_copy(&state->open_stateid, stateid);
1647         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1648 out:
1649         nfs_state_log_update_open_stateid(state);
1650 }
1651
1652 static void nfs_clear_open_stateid(struct nfs4_state *state,
1653         nfs4_stateid *arg_stateid,
1654         nfs4_stateid *stateid, fmode_t fmode)
1655 {
1656         write_seqlock(&state->seqlock);
1657         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1658         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1659                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1660         write_sequnlock(&state->seqlock);
1661         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1662                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1663 }
1664
1665 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1666                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1667         __must_hold(&state->owner->so_lock)
1668         __must_hold(&state->seqlock)
1669         __must_hold(RCU)
1670
1671 {
1672         DEFINE_WAIT(wait);
1673         int status = 0;
1674         for (;;) {
1675
1676                 if (!nfs_need_update_open_stateid(state, stateid))
1677                         return;
1678                 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1679                         break;
1680                 if (status)
1681                         break;
1682                 /* Rely on seqids for serialisation with NFSv4.0 */
1683                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1684                         break;
1685
1686                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1687                 /*
1688                  * Ensure we process the state changes in the same order
1689                  * in which the server processed them by delaying the
1690                  * update of the stateid until we are in sequence.
1691                  */
1692                 write_sequnlock(&state->seqlock);
1693                 spin_unlock(&state->owner->so_lock);
1694                 rcu_read_unlock();
1695                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1696                 if (!signal_pending(current)) {
1697                         if (schedule_timeout(5*HZ) == 0)
1698                                 status = -EAGAIN;
1699                         else
1700                                 status = 0;
1701                 } else
1702                         status = -EINTR;
1703                 finish_wait(&state->waitq, &wait);
1704                 rcu_read_lock();
1705                 spin_lock(&state->owner->so_lock);
1706                 write_seqlock(&state->seqlock);
1707         }
1708
1709         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1710             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1711                 nfs4_stateid_copy(freeme, &state->open_stateid);
1712                 nfs_test_and_clear_all_open_stateid(state);
1713         }
1714
1715         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1716                 nfs4_stateid_copy(&state->stateid, stateid);
1717         nfs4_stateid_copy(&state->open_stateid, stateid);
1718         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1719         nfs_state_log_update_open_stateid(state);
1720 }
1721
1722 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1723                 const nfs4_stateid *open_stateid,
1724                 fmode_t fmode,
1725                 nfs4_stateid *freeme)
1726 {
1727         /*
1728          * Protect the call to nfs4_state_set_mode_locked and
1729          * serialise the stateid update
1730          */
1731         write_seqlock(&state->seqlock);
1732         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1733         switch (fmode) {
1734         case FMODE_READ:
1735                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1736                 break;
1737         case FMODE_WRITE:
1738                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1739                 break;
1740         case FMODE_READ|FMODE_WRITE:
1741                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1742         }
1743         set_bit(NFS_OPEN_STATE, &state->flags);
1744         write_sequnlock(&state->seqlock);
1745 }
1746
1747 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1748 {
1749         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1750         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1751         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1752         clear_bit(NFS_OPEN_STATE, &state->flags);
1753 }
1754
1755 static void nfs_state_set_delegation(struct nfs4_state *state,
1756                 const nfs4_stateid *deleg_stateid,
1757                 fmode_t fmode)
1758 {
1759         /*
1760          * Protect the call to nfs4_state_set_mode_locked and
1761          * serialise the stateid update
1762          */
1763         write_seqlock(&state->seqlock);
1764         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1765         set_bit(NFS_DELEGATED_STATE, &state->flags);
1766         write_sequnlock(&state->seqlock);
1767 }
1768
1769 static void nfs_state_clear_delegation(struct nfs4_state *state)
1770 {
1771         write_seqlock(&state->seqlock);
1772         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1773         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1774         write_sequnlock(&state->seqlock);
1775 }
1776
1777 int update_open_stateid(struct nfs4_state *state,
1778                 const nfs4_stateid *open_stateid,
1779                 const nfs4_stateid *delegation,
1780                 fmode_t fmode)
1781 {
1782         struct nfs_server *server = NFS_SERVER(state->inode);
1783         struct nfs_client *clp = server->nfs_client;
1784         struct nfs_inode *nfsi = NFS_I(state->inode);
1785         struct nfs_delegation *deleg_cur;
1786         nfs4_stateid freeme = { };
1787         int ret = 0;
1788
1789         fmode &= (FMODE_READ|FMODE_WRITE);
1790
1791         rcu_read_lock();
1792         spin_lock(&state->owner->so_lock);
1793         if (open_stateid != NULL) {
1794                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1795                 ret = 1;
1796         }
1797
1798         deleg_cur = nfs4_get_valid_delegation(state->inode);
1799         if (deleg_cur == NULL)
1800                 goto no_delegation;
1801
1802         spin_lock(&deleg_cur->lock);
1803         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1804            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1805             (deleg_cur->type & fmode) != fmode)
1806                 goto no_delegation_unlock;
1807
1808         if (delegation == NULL)
1809                 delegation = &deleg_cur->stateid;
1810         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1811                 goto no_delegation_unlock;
1812
1813         nfs_mark_delegation_referenced(deleg_cur);
1814         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1815         ret = 1;
1816 no_delegation_unlock:
1817         spin_unlock(&deleg_cur->lock);
1818 no_delegation:
1819         if (ret)
1820                 update_open_stateflags(state, fmode);
1821         spin_unlock(&state->owner->so_lock);
1822         rcu_read_unlock();
1823
1824         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1825                 nfs4_schedule_state_manager(clp);
1826         if (freeme.type != 0)
1827                 nfs4_test_and_free_stateid(server, &freeme,
1828                                 state->owner->so_cred);
1829
1830         return ret;
1831 }
1832
1833 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1834                 const nfs4_stateid *stateid)
1835 {
1836         struct nfs4_state *state = lsp->ls_state;
1837         bool ret = false;
1838
1839         spin_lock(&state->state_lock);
1840         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1841                 goto out_noupdate;
1842         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1843                 goto out_noupdate;
1844         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1845         ret = true;
1846 out_noupdate:
1847         spin_unlock(&state->state_lock);
1848         return ret;
1849 }
1850
1851 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1852 {
1853         struct nfs_delegation *delegation;
1854
1855         fmode &= FMODE_READ|FMODE_WRITE;
1856         rcu_read_lock();
1857         delegation = nfs4_get_valid_delegation(inode);
1858         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1859                 rcu_read_unlock();
1860                 return;
1861         }
1862         rcu_read_unlock();
1863         nfs4_inode_return_delegation(inode);
1864 }
1865
1866 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1867 {
1868         struct nfs4_state *state = opendata->state;
1869         struct nfs_delegation *delegation;
1870         int open_mode = opendata->o_arg.open_flags;
1871         fmode_t fmode = opendata->o_arg.fmode;
1872         enum open_claim_type4 claim = opendata->o_arg.claim;
1873         nfs4_stateid stateid;
1874         int ret = -EAGAIN;
1875
1876         for (;;) {
1877                 spin_lock(&state->owner->so_lock);
1878                 if (can_open_cached(state, fmode, open_mode, claim)) {
1879                         update_open_stateflags(state, fmode);
1880                         spin_unlock(&state->owner->so_lock);
1881                         goto out_return_state;
1882                 }
1883                 spin_unlock(&state->owner->so_lock);
1884                 rcu_read_lock();
1885                 delegation = nfs4_get_valid_delegation(state->inode);
1886                 if (!can_open_delegated(delegation, fmode, claim)) {
1887                         rcu_read_unlock();
1888                         break;
1889                 }
1890                 /* Save the delegation */
1891                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1892                 rcu_read_unlock();
1893                 nfs_release_seqid(opendata->o_arg.seqid);
1894                 if (!opendata->is_recover) {
1895                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1896                         if (ret != 0)
1897                                 goto out;
1898                 }
1899                 ret = -EAGAIN;
1900
1901                 /* Try to update the stateid using the delegation */
1902                 if (update_open_stateid(state, NULL, &stateid, fmode))
1903                         goto out_return_state;
1904         }
1905 out:
1906         return ERR_PTR(ret);
1907 out_return_state:
1908         refcount_inc(&state->count);
1909         return state;
1910 }
1911
1912 static void
1913 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1914 {
1915         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1916         struct nfs_delegation *delegation;
1917         int delegation_flags = 0;
1918
1919         rcu_read_lock();
1920         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1921         if (delegation)
1922                 delegation_flags = delegation->flags;
1923         rcu_read_unlock();
1924         switch (data->o_arg.claim) {
1925         default:
1926                 break;
1927         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1928         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1929                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1930                                    "returning a delegation for "
1931                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1932                                    clp->cl_hostname);
1933                 return;
1934         }
1935         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1936                 nfs_inode_set_delegation(state->inode,
1937                                 data->owner->so_cred,
1938                                 data->o_res.delegation_type,
1939                                 &data->o_res.delegation,
1940                                 data->o_res.pagemod_limit);
1941         else
1942                 nfs_inode_reclaim_delegation(state->inode,
1943                                 data->owner->so_cred,
1944                                 data->o_res.delegation_type,
1945                                 &data->o_res.delegation,
1946                                 data->o_res.pagemod_limit);
1947
1948         if (data->o_res.do_recall)
1949                 nfs_async_inode_return_delegation(state->inode,
1950                                                   &data->o_res.delegation);
1951 }
1952
1953 /*
1954  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1955  * and update the nfs4_state.
1956  */
1957 static struct nfs4_state *
1958 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1959 {
1960         struct inode *inode = data->state->inode;
1961         struct nfs4_state *state = data->state;
1962         int ret;
1963
1964         if (!data->rpc_done) {
1965                 if (data->rpc_status)
1966                         return ERR_PTR(data->rpc_status);
1967                 /* cached opens have already been processed */
1968                 goto update;
1969         }
1970
1971         ret = nfs_refresh_inode(inode, &data->f_attr);
1972         if (ret)
1973                 return ERR_PTR(ret);
1974
1975         if (data->o_res.delegation_type != 0)
1976                 nfs4_opendata_check_deleg(data, state);
1977 update:
1978         if (!update_open_stateid(state, &data->o_res.stateid,
1979                                 NULL, data->o_arg.fmode))
1980                 return ERR_PTR(-EAGAIN);
1981         refcount_inc(&state->count);
1982
1983         return state;
1984 }
1985
1986 static struct inode *
1987 nfs4_opendata_get_inode(struct nfs4_opendata *data)
1988 {
1989         struct inode *inode;
1990
1991         switch (data->o_arg.claim) {
1992         case NFS4_OPEN_CLAIM_NULL:
1993         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1994         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1995                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1996                         return ERR_PTR(-EAGAIN);
1997                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
1998                                 &data->f_attr, data->f_label);
1999                 break;
2000         default:
2001                 inode = d_inode(data->dentry);
2002                 ihold(inode);
2003                 nfs_refresh_inode(inode, &data->f_attr);
2004         }
2005         return inode;
2006 }
2007
2008 static struct nfs4_state *
2009 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2010 {
2011         struct nfs4_state *state;
2012         struct inode *inode;
2013
2014         inode = nfs4_opendata_get_inode(data);
2015         if (IS_ERR(inode))
2016                 return ERR_CAST(inode);
2017         if (data->state != NULL && data->state->inode == inode) {
2018                 state = data->state;
2019                 refcount_inc(&state->count);
2020         } else
2021                 state = nfs4_get_open_state(inode, data->owner);
2022         iput(inode);
2023         if (state == NULL)
2024                 state = ERR_PTR(-ENOMEM);
2025         return state;
2026 }
2027
2028 static struct nfs4_state *
2029 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2030 {
2031         struct nfs4_state *state;
2032
2033         if (!data->rpc_done) {
2034                 state = nfs4_try_open_cached(data);
2035                 trace_nfs4_cached_open(data->state);
2036                 goto out;
2037         }
2038
2039         state = nfs4_opendata_find_nfs4_state(data);
2040         if (IS_ERR(state))
2041                 goto out;
2042
2043         if (data->o_res.delegation_type != 0)
2044                 nfs4_opendata_check_deleg(data, state);
2045         if (!update_open_stateid(state, &data->o_res.stateid,
2046                                 NULL, data->o_arg.fmode)) {
2047                 nfs4_put_open_state(state);
2048                 state = ERR_PTR(-EAGAIN);
2049         }
2050 out:
2051         nfs_release_seqid(data->o_arg.seqid);
2052         return state;
2053 }
2054
2055 static struct nfs4_state *
2056 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2057 {
2058         struct nfs4_state *ret;
2059
2060         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2061                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2062         else
2063                 ret = _nfs4_opendata_to_nfs4_state(data);
2064         nfs4_sequence_free_slot(&data->o_res.seq_res);
2065         return ret;
2066 }
2067
2068 static struct nfs_open_context *
2069 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2070 {
2071         struct nfs_inode *nfsi = NFS_I(state->inode);
2072         struct nfs_open_context *ctx;
2073
2074         rcu_read_lock();
2075         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2076                 if (ctx->state != state)
2077                         continue;
2078                 if ((ctx->mode & mode) != mode)
2079                         continue;
2080                 if (!get_nfs_open_context(ctx))
2081                         continue;
2082                 rcu_read_unlock();
2083                 return ctx;
2084         }
2085         rcu_read_unlock();
2086         return ERR_PTR(-ENOENT);
2087 }
2088
2089 static struct nfs_open_context *
2090 nfs4_state_find_open_context(struct nfs4_state *state)
2091 {
2092         struct nfs_open_context *ctx;
2093
2094         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2095         if (!IS_ERR(ctx))
2096                 return ctx;
2097         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2098         if (!IS_ERR(ctx))
2099                 return ctx;
2100         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2101 }
2102
2103 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2104                 struct nfs4_state *state, enum open_claim_type4 claim)
2105 {
2106         struct nfs4_opendata *opendata;
2107
2108         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2109                         NULL, claim, GFP_NOFS);
2110         if (opendata == NULL)
2111                 return ERR_PTR(-ENOMEM);
2112         opendata->state = state;
2113         refcount_inc(&state->count);
2114         return opendata;
2115 }
2116
2117 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2118                 fmode_t fmode)
2119 {
2120         struct nfs4_state *newstate;
2121         int ret;
2122
2123         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2124                 return 0;
2125         opendata->o_arg.open_flags = 0;
2126         opendata->o_arg.fmode = fmode;
2127         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
2128                         NFS_SB(opendata->dentry->d_sb),
2129                         fmode, 0);
2130         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2131         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2132         nfs4_init_opendata_res(opendata);
2133         ret = _nfs4_recover_proc_open(opendata);
2134         if (ret != 0)
2135                 return ret;
2136         newstate = nfs4_opendata_to_nfs4_state(opendata);
2137         if (IS_ERR(newstate))
2138                 return PTR_ERR(newstate);
2139         if (newstate != opendata->state)
2140                 ret = -ESTALE;
2141         nfs4_close_state(newstate, fmode);
2142         return ret;
2143 }
2144
2145 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2146 {
2147         int ret;
2148
2149         /* memory barrier prior to reading state->n_* */
2150         smp_rmb();
2151         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2152         if (ret != 0)
2153                 return ret;
2154         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2155         if (ret != 0)
2156                 return ret;
2157         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2158         if (ret != 0)
2159                 return ret;
2160         /*
2161          * We may have performed cached opens for all three recoveries.
2162          * Check if we need to update the current stateid.
2163          */
2164         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2165             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2166                 write_seqlock(&state->seqlock);
2167                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2168                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2169                 write_sequnlock(&state->seqlock);
2170         }
2171         return 0;
2172 }
2173
2174 /*
2175  * OPEN_RECLAIM:
2176  *      reclaim state on the server after a reboot.
2177  */
2178 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2179 {
2180         struct nfs_delegation *delegation;
2181         struct nfs4_opendata *opendata;
2182         fmode_t delegation_type = 0;
2183         int status;
2184
2185         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2186                         NFS4_OPEN_CLAIM_PREVIOUS);
2187         if (IS_ERR(opendata))
2188                 return PTR_ERR(opendata);
2189         rcu_read_lock();
2190         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2191         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2192                 delegation_type = delegation->type;
2193         rcu_read_unlock();
2194         opendata->o_arg.u.delegation_type = delegation_type;
2195         status = nfs4_open_recover(opendata, state);
2196         nfs4_opendata_put(opendata);
2197         return status;
2198 }
2199
2200 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2201 {
2202         struct nfs_server *server = NFS_SERVER(state->inode);
2203         struct nfs4_exception exception = { };
2204         int err;
2205         do {
2206                 err = _nfs4_do_open_reclaim(ctx, state);
2207                 trace_nfs4_open_reclaim(ctx, 0, err);
2208                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2209                         continue;
2210                 if (err != -NFS4ERR_DELAY)
2211                         break;
2212                 nfs4_handle_exception(server, err, &exception);
2213         } while (exception.retry);
2214         return err;
2215 }
2216
2217 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2218 {
2219         struct nfs_open_context *ctx;
2220         int ret;
2221
2222         ctx = nfs4_state_find_open_context(state);
2223         if (IS_ERR(ctx))
2224                 return -EAGAIN;
2225         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2226         nfs_state_clear_open_state_flags(state);
2227         ret = nfs4_do_open_reclaim(ctx, state);
2228         put_nfs_open_context(ctx);
2229         return ret;
2230 }
2231
2232 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)
2233 {
2234         switch (err) {
2235                 default:
2236                         printk(KERN_ERR "NFS: %s: unhandled error "
2237                                         "%d.\n", __func__, err);
2238                 case 0:
2239                 case -ENOENT:
2240                 case -EAGAIN:
2241                 case -ESTALE:
2242                 case -ETIMEDOUT:
2243                         break;
2244                 case -NFS4ERR_BADSESSION:
2245                 case -NFS4ERR_BADSLOT:
2246                 case -NFS4ERR_BAD_HIGH_SLOT:
2247                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2248                 case -NFS4ERR_DEADSESSION:
2249                         return -EAGAIN;
2250                 case -NFS4ERR_STALE_CLIENTID:
2251                 case -NFS4ERR_STALE_STATEID:
2252                         /* Don't recall a delegation if it was lost */
2253                         nfs4_schedule_lease_recovery(server->nfs_client);
2254                         return -EAGAIN;
2255                 case -NFS4ERR_MOVED:
2256                         nfs4_schedule_migration_recovery(server);
2257                         return -EAGAIN;
2258                 case -NFS4ERR_LEASE_MOVED:
2259                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2260                         return -EAGAIN;
2261                 case -NFS4ERR_DELEG_REVOKED:
2262                 case -NFS4ERR_ADMIN_REVOKED:
2263                 case -NFS4ERR_EXPIRED:
2264                 case -NFS4ERR_BAD_STATEID:
2265                 case -NFS4ERR_OPENMODE:
2266                         nfs_inode_find_state_and_recover(state->inode,
2267                                         stateid);
2268                         nfs4_schedule_stateid_recovery(server, state);
2269                         return -EAGAIN;
2270                 case -NFS4ERR_DELAY:
2271                 case -NFS4ERR_GRACE:
2272                         ssleep(1);
2273                         return -EAGAIN;
2274                 case -ENOMEM:
2275                 case -NFS4ERR_DENIED:
2276                         if (fl) {
2277                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2278                                 if (lsp)
2279                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2280                         }
2281                         return 0;
2282         }
2283         return err;
2284 }
2285
2286 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2287                 struct nfs4_state *state, const nfs4_stateid *stateid)
2288 {
2289         struct nfs_server *server = NFS_SERVER(state->inode);
2290         struct nfs4_opendata *opendata;
2291         int err = 0;
2292
2293         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2294                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2295         if (IS_ERR(opendata))
2296                 return PTR_ERR(opendata);
2297         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2298         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2299                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2300                 if (err)
2301                         goto out;
2302         }
2303         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2304                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2305                 if (err)
2306                         goto out;
2307         }
2308         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2309                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2310                 if (err)
2311                         goto out;
2312         }
2313         nfs_state_clear_delegation(state);
2314 out:
2315         nfs4_opendata_put(opendata);
2316         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2317 }
2318
2319 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2320 {
2321         struct nfs4_opendata *data = calldata;
2322
2323         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2324                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2325 }
2326
2327 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2328 {
2329         struct nfs4_opendata *data = calldata;
2330
2331         nfs40_sequence_done(task, &data->c_res.seq_res);
2332
2333         data->rpc_status = task->tk_status;
2334         if (data->rpc_status == 0) {
2335                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2336                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2337                 renew_lease(data->o_res.server, data->timestamp);
2338                 data->rpc_done = true;
2339         }
2340 }
2341
2342 static void nfs4_open_confirm_release(void *calldata)
2343 {
2344         struct nfs4_opendata *data = calldata;
2345         struct nfs4_state *state = NULL;
2346
2347         /* If this request hasn't been cancelled, do nothing */
2348         if (!data->cancelled)
2349                 goto out_free;
2350         /* In case of error, no cleanup! */
2351         if (!data->rpc_done)
2352                 goto out_free;
2353         state = nfs4_opendata_to_nfs4_state(data);
2354         if (!IS_ERR(state))
2355                 nfs4_close_state(state, data->o_arg.fmode);
2356 out_free:
2357         nfs4_opendata_put(data);
2358 }
2359
2360 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2361         .rpc_call_prepare = nfs4_open_confirm_prepare,
2362         .rpc_call_done = nfs4_open_confirm_done,
2363         .rpc_release = nfs4_open_confirm_release,
2364 };
2365
2366 /*
2367  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2368  */
2369 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2370 {
2371         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2372         struct rpc_task *task;
2373         struct  rpc_message msg = {
2374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2375                 .rpc_argp = &data->c_arg,
2376                 .rpc_resp = &data->c_res,
2377                 .rpc_cred = data->owner->so_cred,
2378         };
2379         struct rpc_task_setup task_setup_data = {
2380                 .rpc_client = server->client,
2381                 .rpc_message = &msg,
2382                 .callback_ops = &nfs4_open_confirm_ops,
2383                 .callback_data = data,
2384                 .workqueue = nfsiod_workqueue,
2385                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2386         };
2387         int status;
2388
2389         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2390                                 data->is_recover);
2391         kref_get(&data->kref);
2392         data->rpc_done = false;
2393         data->rpc_status = 0;
2394         data->timestamp = jiffies;
2395         task = rpc_run_task(&task_setup_data);
2396         if (IS_ERR(task))
2397                 return PTR_ERR(task);
2398         status = rpc_wait_for_completion_task(task);
2399         if (status != 0) {
2400                 data->cancelled = true;
2401                 smp_wmb();
2402         } else
2403                 status = data->rpc_status;
2404         rpc_put_task(task);
2405         return status;
2406 }
2407
2408 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2409 {
2410         struct nfs4_opendata *data = calldata;
2411         struct nfs4_state_owner *sp = data->owner;
2412         struct nfs_client *clp = sp->so_server->nfs_client;
2413         enum open_claim_type4 claim = data->o_arg.claim;
2414
2415         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2416                 goto out_wait;
2417         /*
2418          * Check if we still need to send an OPEN call, or if we can use
2419          * a delegation instead.
2420          */
2421         if (data->state != NULL) {
2422                 struct nfs_delegation *delegation;
2423
2424                 if (can_open_cached(data->state, data->o_arg.fmode,
2425                                         data->o_arg.open_flags, claim))
2426                         goto out_no_action;
2427                 rcu_read_lock();
2428                 delegation = nfs4_get_valid_delegation(data->state->inode);
2429                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2430                         goto unlock_no_action;
2431                 rcu_read_unlock();
2432         }
2433         /* Update client id. */
2434         data->o_arg.clientid = clp->cl_clientid;
2435         switch (claim) {
2436         default:
2437                 break;
2438         case NFS4_OPEN_CLAIM_PREVIOUS:
2439         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2440         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2441                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2442                 fallthrough;
2443         case NFS4_OPEN_CLAIM_FH:
2444                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2445         }
2446         data->timestamp = jiffies;
2447         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2448                                 &data->o_arg.seq_args,
2449                                 &data->o_res.seq_res,
2450                                 task) != 0)
2451                 nfs_release_seqid(data->o_arg.seqid);
2452
2453         /* Set the create mode (note dependency on the session type) */
2454         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2455         if (data->o_arg.open_flags & O_EXCL) {
2456                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2457                 if (nfs4_has_persistent_session(clp))
2458                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2459                 else if (clp->cl_mvops->minor_version > 0)
2460                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2461         }
2462         return;
2463 unlock_no_action:
2464         trace_nfs4_cached_open(data->state);
2465         rcu_read_unlock();
2466 out_no_action:
2467         task->tk_action = NULL;
2468 out_wait:
2469         nfs4_sequence_done(task, &data->o_res.seq_res);
2470 }
2471
2472 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2473 {
2474         struct nfs4_opendata *data = calldata;
2475
2476         data->rpc_status = task->tk_status;
2477
2478         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2479                 return;
2480
2481         if (task->tk_status == 0) {
2482                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2483                         switch (data->o_res.f_attr->mode & S_IFMT) {
2484                         case S_IFREG:
2485                                 break;
2486                         case S_IFLNK:
2487                                 data->rpc_status = -ELOOP;
2488                                 break;
2489                         case S_IFDIR:
2490                                 data->rpc_status = -EISDIR;
2491                                 break;
2492                         default:
2493                                 data->rpc_status = -ENOTDIR;
2494                         }
2495                 }
2496                 renew_lease(data->o_res.server, data->timestamp);
2497                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2498                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2499         }
2500         data->rpc_done = true;
2501 }
2502
2503 static void nfs4_open_release(void *calldata)
2504 {
2505         struct nfs4_opendata *data = calldata;
2506         struct nfs4_state *state = NULL;
2507
2508         /* If this request hasn't been cancelled, do nothing */
2509         if (!data->cancelled)
2510                 goto out_free;
2511         /* In case of error, no cleanup! */
2512         if (data->rpc_status != 0 || !data->rpc_done)
2513                 goto out_free;
2514         /* In case we need an open_confirm, no cleanup! */
2515         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2516                 goto out_free;
2517         state = nfs4_opendata_to_nfs4_state(data);
2518         if (!IS_ERR(state))
2519                 nfs4_close_state(state, data->o_arg.fmode);
2520 out_free:
2521         nfs4_opendata_put(data);
2522 }
2523
2524 static const struct rpc_call_ops nfs4_open_ops = {
2525         .rpc_call_prepare = nfs4_open_prepare,
2526         .rpc_call_done = nfs4_open_done,
2527         .rpc_release = nfs4_open_release,
2528 };
2529
2530 static int nfs4_run_open_task(struct nfs4_opendata *data,
2531                               struct nfs_open_context *ctx)
2532 {
2533         struct inode *dir = d_inode(data->dir);
2534         struct nfs_server *server = NFS_SERVER(dir);
2535         struct nfs_openargs *o_arg = &data->o_arg;
2536         struct nfs_openres *o_res = &data->o_res;
2537         struct rpc_task *task;
2538         struct rpc_message msg = {
2539                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2540                 .rpc_argp = o_arg,
2541                 .rpc_resp = o_res,
2542                 .rpc_cred = data->owner->so_cred,
2543         };
2544         struct rpc_task_setup task_setup_data = {
2545                 .rpc_client = server->client,
2546                 .rpc_message = &msg,
2547                 .callback_ops = &nfs4_open_ops,
2548                 .callback_data = data,
2549                 .workqueue = nfsiod_workqueue,
2550                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2551         };
2552         int status;
2553
2554         kref_get(&data->kref);
2555         data->rpc_done = false;
2556         data->rpc_status = 0;
2557         data->cancelled = false;
2558         data->is_recover = false;
2559         if (!ctx) {
2560                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2561                 data->is_recover = true;
2562                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2563         } else {
2564                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2565                 pnfs_lgopen_prepare(data, ctx);
2566         }
2567         task = rpc_run_task(&task_setup_data);
2568         if (IS_ERR(task))
2569                 return PTR_ERR(task);
2570         status = rpc_wait_for_completion_task(task);
2571         if (status != 0) {
2572                 data->cancelled = true;
2573                 smp_wmb();
2574         } else
2575                 status = data->rpc_status;
2576         rpc_put_task(task);
2577
2578         return status;
2579 }
2580
2581 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2582 {
2583         struct inode *dir = d_inode(data->dir);
2584         struct nfs_openres *o_res = &data->o_res;
2585         int status;
2586
2587         status = nfs4_run_open_task(data, NULL);
2588         if (status != 0 || !data->rpc_done)
2589                 return status;
2590
2591         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2592
2593         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2594                 status = _nfs4_proc_open_confirm(data);
2595
2596         return status;
2597 }
2598
2599 /*
2600  * Additional permission checks in order to distinguish between an
2601  * open for read, and an open for execute. This works around the
2602  * fact that NFSv4 OPEN treats read and execute permissions as being
2603  * the same.
2604  * Note that in the non-execute case, we want to turn off permission
2605  * checking if we just created a new file (POSIX open() semantics).
2606  */
2607 static int nfs4_opendata_access(const struct cred *cred,
2608                                 struct nfs4_opendata *opendata,
2609                                 struct nfs4_state *state, fmode_t fmode,
2610                                 int openflags)
2611 {
2612         struct nfs_access_entry cache;
2613         u32 mask, flags;
2614
2615         /* access call failed or for some reason the server doesn't
2616          * support any access modes -- defer access call until later */
2617         if (opendata->o_res.access_supported == 0)
2618                 return 0;
2619
2620         mask = 0;
2621         /*
2622          * Use openflags to check for exec, because fmode won't
2623          * always have FMODE_EXEC set when file open for exec.
2624          */
2625         if (openflags & __FMODE_EXEC) {
2626                 /* ONLY check for exec rights */
2627                 if (S_ISDIR(state->inode->i_mode))
2628                         mask = NFS4_ACCESS_LOOKUP;
2629                 else
2630                         mask = NFS4_ACCESS_EXECUTE;
2631         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2632                 mask = NFS4_ACCESS_READ;
2633
2634         cache.cred = cred;
2635         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2636         nfs_access_add_cache(state->inode, &cache);
2637
2638         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2639         if ((mask & ~cache.mask & flags) == 0)
2640                 return 0;
2641
2642         return -EACCES;
2643 }
2644
2645 /*
2646  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2647  */
2648 static int _nfs4_proc_open(struct nfs4_opendata *data,
2649                            struct nfs_open_context *ctx)
2650 {
2651         struct inode *dir = d_inode(data->dir);
2652         struct nfs_server *server = NFS_SERVER(dir);
2653         struct nfs_openargs *o_arg = &data->o_arg;
2654         struct nfs_openres *o_res = &data->o_res;
2655         int status;
2656
2657         status = nfs4_run_open_task(data, ctx);
2658         if (!data->rpc_done)
2659                 return status;
2660         if (status != 0) {
2661                 if (status == -NFS4ERR_BADNAME &&
2662                                 !(o_arg->open_flags & O_CREAT))
2663                         return -ENOENT;
2664                 return status;
2665         }
2666
2667         nfs_fattr_map_and_free_names(server, &data->f_attr);
2668
2669         if (o_arg->open_flags & O_CREAT) {
2670                 if (o_arg->open_flags & O_EXCL)
2671                         data->file_created = true;
2672                 else if (o_res->cinfo.before != o_res->cinfo.after)
2673                         data->file_created = true;
2674                 if (data->file_created ||
2675                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2676                         nfs4_update_changeattr(dir, &o_res->cinfo,
2677                                         o_res->f_attr->time_start,
2678                                         NFS_INO_INVALID_DATA);
2679         }
2680         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2681                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2682         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2683                 status = _nfs4_proc_open_confirm(data);
2684                 if (status != 0)
2685                         return status;
2686         }
2687         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2688                 nfs4_sequence_free_slot(&o_res->seq_res);
2689                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr,
2690                                 o_res->f_label, NULL);
2691         }
2692         return 0;
2693 }
2694
2695 /*
2696  * OPEN_EXPIRED:
2697  *      reclaim state on the server after a network partition.
2698  *      Assumes caller holds the appropriate lock
2699  */
2700 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2701 {
2702         struct nfs4_opendata *opendata;
2703         int ret;
2704
2705         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2706                         NFS4_OPEN_CLAIM_FH);
2707         if (IS_ERR(opendata))
2708                 return PTR_ERR(opendata);
2709         ret = nfs4_open_recover(opendata, state);
2710         if (ret == -ESTALE)
2711                 d_drop(ctx->dentry);
2712         nfs4_opendata_put(opendata);
2713         return ret;
2714 }
2715
2716 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2717 {
2718         struct nfs_server *server = NFS_SERVER(state->inode);
2719         struct nfs4_exception exception = { };
2720         int err;
2721
2722         do {
2723                 err = _nfs4_open_expired(ctx, state);
2724                 trace_nfs4_open_expired(ctx, 0, err);
2725                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2726                         continue;
2727                 switch (err) {
2728                 default:
2729                         goto out;
2730                 case -NFS4ERR_GRACE:
2731                 case -NFS4ERR_DELAY:
2732                         nfs4_handle_exception(server, err, &exception);
2733                         err = 0;
2734                 }
2735         } while (exception.retry);
2736 out:
2737         return err;
2738 }
2739
2740 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2741 {
2742         struct nfs_open_context *ctx;
2743         int ret;
2744
2745         ctx = nfs4_state_find_open_context(state);
2746         if (IS_ERR(ctx))
2747                 return -EAGAIN;
2748         ret = nfs4_do_open_expired(ctx, state);
2749         put_nfs_open_context(ctx);
2750         return ret;
2751 }
2752
2753 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2754                 const nfs4_stateid *stateid)
2755 {
2756         nfs_remove_bad_delegation(state->inode, stateid);
2757         nfs_state_clear_delegation(state);
2758 }
2759
2760 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2761 {
2762         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2763                 nfs_finish_clear_delegation_stateid(state, NULL);
2764 }
2765
2766 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2767 {
2768         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2769         nfs40_clear_delegation_stateid(state);
2770         nfs_state_clear_open_state_flags(state);
2771         return nfs4_open_expired(sp, state);
2772 }
2773
2774 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2775                 nfs4_stateid *stateid,
2776                 const struct cred *cred)
2777 {
2778         return -NFS4ERR_BAD_STATEID;
2779 }
2780
2781 #if defined(CONFIG_NFS_V4_1)
2782 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2783                 nfs4_stateid *stateid,
2784                 const struct cred *cred)
2785 {
2786         int status;
2787
2788         switch (stateid->type) {
2789         default:
2790                 break;
2791         case NFS4_INVALID_STATEID_TYPE:
2792         case NFS4_SPECIAL_STATEID_TYPE:
2793                 return -NFS4ERR_BAD_STATEID;
2794         case NFS4_REVOKED_STATEID_TYPE:
2795                 goto out_free;
2796         }
2797
2798         status = nfs41_test_stateid(server, stateid, cred);
2799         switch (status) {
2800         case -NFS4ERR_EXPIRED:
2801         case -NFS4ERR_ADMIN_REVOKED:
2802         case -NFS4ERR_DELEG_REVOKED:
2803                 break;
2804         default:
2805                 return status;
2806         }
2807 out_free:
2808         /* Ack the revoked state to the server */
2809         nfs41_free_stateid(server, stateid, cred, true);
2810         return -NFS4ERR_EXPIRED;
2811 }
2812
2813 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2814 {
2815         struct nfs_server *server = NFS_SERVER(state->inode);
2816         nfs4_stateid stateid;
2817         struct nfs_delegation *delegation;
2818         const struct cred *cred = NULL;
2819         int status, ret = NFS_OK;
2820
2821         /* Get the delegation credential for use by test/free_stateid */
2822         rcu_read_lock();
2823         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2824         if (delegation == NULL) {
2825                 rcu_read_unlock();
2826                 nfs_state_clear_delegation(state);
2827                 return NFS_OK;
2828         }
2829
2830         spin_lock(&delegation->lock);
2831         nfs4_stateid_copy(&stateid, &delegation->stateid);
2832
2833         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2834                                 &delegation->flags)) {
2835                 spin_unlock(&delegation->lock);
2836                 rcu_read_unlock();
2837                 return NFS_OK;
2838         }
2839
2840         if (delegation->cred)
2841                 cred = get_cred(delegation->cred);
2842         spin_unlock(&delegation->lock);
2843         rcu_read_unlock();
2844         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2845         trace_nfs4_test_delegation_stateid(state, NULL, status);
2846         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2847                 nfs_finish_clear_delegation_stateid(state, &stateid);
2848         else
2849                 ret = status;
2850
2851         put_cred(cred);
2852         return ret;
2853 }
2854
2855 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2856 {
2857         nfs4_stateid tmp;
2858
2859         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2860             nfs4_copy_delegation_stateid(state->inode, state->state,
2861                                 &tmp, NULL) &&
2862             nfs4_stateid_match_other(&state->stateid, &tmp))
2863                 nfs_state_set_delegation(state, &tmp, state->state);
2864         else
2865                 nfs_state_clear_delegation(state);
2866 }
2867
2868 /**
2869  * nfs41_check_expired_locks - possibly free a lock stateid
2870  *
2871  * @state: NFSv4 state for an inode
2872  *
2873  * Returns NFS_OK if recovery for this stateid is now finished.
2874  * Otherwise a negative NFS4ERR value is returned.
2875  */
2876 static int nfs41_check_expired_locks(struct nfs4_state *state)
2877 {
2878         int status, ret = NFS_OK;
2879         struct nfs4_lock_state *lsp, *prev = NULL;
2880         struct nfs_server *server = NFS_SERVER(state->inode);
2881
2882         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2883                 goto out;
2884
2885         spin_lock(&state->state_lock);
2886         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2887                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2888                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2889
2890                         refcount_inc(&lsp->ls_count);
2891                         spin_unlock(&state->state_lock);
2892
2893                         nfs4_put_lock_state(prev);
2894                         prev = lsp;
2895
2896                         status = nfs41_test_and_free_expired_stateid(server,
2897                                         &lsp->ls_stateid,
2898                                         cred);
2899                         trace_nfs4_test_lock_stateid(state, lsp, status);
2900                         if (status == -NFS4ERR_EXPIRED ||
2901                             status == -NFS4ERR_BAD_STATEID) {
2902                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2903                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2904                                 if (!recover_lost_locks)
2905                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2906                         } else if (status != NFS_OK) {
2907                                 ret = status;
2908                                 nfs4_put_lock_state(prev);
2909                                 goto out;
2910                         }
2911                         spin_lock(&state->state_lock);
2912                 }
2913         }
2914         spin_unlock(&state->state_lock);
2915         nfs4_put_lock_state(prev);
2916 out:
2917         return ret;
2918 }
2919
2920 /**
2921  * nfs41_check_open_stateid - possibly free an open stateid
2922  *
2923  * @state: NFSv4 state for an inode
2924  *
2925  * Returns NFS_OK if recovery for this stateid is now finished.
2926  * Otherwise a negative NFS4ERR value is returned.
2927  */
2928 static int nfs41_check_open_stateid(struct nfs4_state *state)
2929 {
2930         struct nfs_server *server = NFS_SERVER(state->inode);
2931         nfs4_stateid *stateid = &state->open_stateid;
2932         const struct cred *cred = state->owner->so_cred;
2933         int status;
2934
2935         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2936                 return -NFS4ERR_BAD_STATEID;
2937         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2938         trace_nfs4_test_open_stateid(state, NULL, status);
2939         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2940                 nfs_state_clear_open_state_flags(state);
2941                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2942                 return status;
2943         }
2944         if (nfs_open_stateid_recover_openmode(state))
2945                 return -NFS4ERR_OPENMODE;
2946         return NFS_OK;
2947 }
2948
2949 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2950 {
2951         int status;
2952
2953         status = nfs41_check_delegation_stateid(state);
2954         if (status != NFS_OK)
2955                 return status;
2956         nfs41_delegation_recover_stateid(state);
2957
2958         status = nfs41_check_expired_locks(state);
2959         if (status != NFS_OK)
2960                 return status;
2961         status = nfs41_check_open_stateid(state);
2962         if (status != NFS_OK)
2963                 status = nfs4_open_expired(sp, state);
2964         return status;
2965 }
2966 #endif
2967
2968 /*
2969  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2970  * fields corresponding to attributes that were used to store the verifier.
2971  * Make sure we clobber those fields in the later setattr call
2972  */
2973 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2974                                 struct iattr *sattr, struct nfs4_label **label)
2975 {
2976         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2977         __u32 attrset[3];
2978         unsigned ret;
2979         unsigned i;
2980
2981         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
2982                 attrset[i] = opendata->o_res.attrset[i];
2983                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
2984                         attrset[i] &= ~bitmask[i];
2985         }
2986
2987         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
2988                 sattr->ia_valid : 0;
2989
2990         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
2991                 if (sattr->ia_valid & ATTR_ATIME_SET)
2992                         ret |= ATTR_ATIME_SET;
2993                 else
2994                         ret |= ATTR_ATIME;
2995         }
2996
2997         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
2998                 if (sattr->ia_valid & ATTR_MTIME_SET)
2999                         ret |= ATTR_MTIME_SET;
3000                 else
3001                         ret |= ATTR_MTIME;
3002         }
3003
3004         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3005                 *label = NULL;
3006         return ret;
3007 }
3008
3009 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3010                 int flags, struct nfs_open_context *ctx)
3011 {
3012         struct nfs4_state_owner *sp = opendata->owner;
3013         struct nfs_server *server = sp->so_server;
3014         struct dentry *dentry;
3015         struct nfs4_state *state;
3016         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3017         struct inode *dir = d_inode(opendata->dir);
3018         unsigned long dir_verifier;
3019         unsigned int seq;
3020         int ret;
3021
3022         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3023         dir_verifier = nfs_save_change_attribute(dir);
3024
3025         ret = _nfs4_proc_open(opendata, ctx);
3026         if (ret != 0)
3027                 goto out;
3028
3029         state = _nfs4_opendata_to_nfs4_state(opendata);
3030         ret = PTR_ERR(state);
3031         if (IS_ERR(state))
3032                 goto out;
3033         ctx->state = state;
3034         if (server->caps & NFS_CAP_POSIX_LOCK)
3035                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3036         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3037                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3038
3039         dentry = opendata->dentry;
3040         if (d_really_is_negative(dentry)) {
3041                 struct dentry *alias;
3042                 d_drop(dentry);
3043                 alias = d_exact_alias(dentry, state->inode);
3044                 if (!alias)
3045                         alias = d_splice_alias(igrab(state->inode), dentry);
3046                 /* d_splice_alias() can't fail here - it's a non-directory */
3047                 if (alias) {
3048                         dput(ctx->dentry);
3049                         ctx->dentry = dentry = alias;
3050                 }
3051         }
3052
3053         switch(opendata->o_arg.claim) {
3054         default:
3055                 break;
3056         case NFS4_OPEN_CLAIM_NULL:
3057         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3058         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3059                 if (!opendata->rpc_done)
3060                         break;
3061                 if (opendata->o_res.delegation_type != 0)
3062                         dir_verifier = nfs_save_change_attribute(dir);
3063                 nfs_set_verifier(dentry, dir_verifier);
3064         }
3065
3066         /* Parse layoutget results before we check for access */
3067         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3068
3069         ret = nfs4_opendata_access(sp->so_cred, opendata, state,
3070                         acc_mode, flags);
3071         if (ret != 0)
3072                 goto out;
3073
3074         if (d_inode(dentry) == state->inode) {
3075                 nfs_inode_attach_open_context(ctx);
3076                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3077                         nfs4_schedule_stateid_recovery(server, state);
3078         }
3079
3080 out:
3081         if (!opendata->cancelled)
3082                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3083         return ret;
3084 }
3085
3086 /*
3087  * Returns a referenced nfs4_state
3088  */
3089 static int _nfs4_do_open(struct inode *dir,
3090                         struct nfs_open_context *ctx,
3091                         int flags,
3092                         const struct nfs4_open_createattrs *c,
3093                         int *opened)
3094 {
3095         struct nfs4_state_owner  *sp;
3096         struct nfs4_state     *state = NULL;
3097         struct nfs_server       *server = NFS_SERVER(dir);
3098         struct nfs4_opendata *opendata;
3099         struct dentry *dentry = ctx->dentry;
3100         const struct cred *cred = ctx->cred;
3101         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3102         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3103         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3104         struct iattr *sattr = c->sattr;
3105         struct nfs4_label *label = c->label;
3106         struct nfs4_label *olabel = NULL;
3107         int status;
3108
3109         /* Protect against reboot recovery conflicts */
3110         status = -ENOMEM;
3111         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3112         if (sp == NULL) {
3113                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3114                 goto out_err;
3115         }
3116         status = nfs4_client_recover_expired_lease(server->nfs_client);
3117         if (status != 0)
3118                 goto err_put_state_owner;
3119         if (d_really_is_positive(dentry))
3120                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3121         status = -ENOMEM;
3122         if (d_really_is_positive(dentry))
3123                 claim = NFS4_OPEN_CLAIM_FH;
3124         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3125                         c, claim, GFP_KERNEL);
3126         if (opendata == NULL)
3127                 goto err_put_state_owner;
3128
3129         if (label) {
3130                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
3131                 if (IS_ERR(olabel)) {
3132                         status = PTR_ERR(olabel);
3133                         goto err_opendata_put;
3134                 }
3135         }
3136
3137         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3138                 if (!opendata->f_attr.mdsthreshold) {
3139                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3140                         if (!opendata->f_attr.mdsthreshold)
3141                                 goto err_free_label;
3142                 }
3143                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3144         }
3145         if (d_really_is_positive(dentry))
3146                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3147
3148         status = _nfs4_open_and_get_state(opendata, flags, ctx);
3149         if (status != 0)
3150                 goto err_free_label;
3151         state = ctx->state;
3152
3153         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3154             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3155                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3156                 /*
3157                  * send create attributes which was not set by open
3158                  * with an extra setattr.
3159                  */
3160                 if (attrs || label) {
3161                         unsigned ia_old = sattr->ia_valid;
3162
3163                         sattr->ia_valid = attrs;
3164                         nfs_fattr_init(opendata->o_res.f_attr);
3165                         status = nfs4_do_setattr(state->inode, cred,
3166                                         opendata->o_res.f_attr, sattr,
3167                                         ctx, label, olabel);
3168                         if (status == 0) {
3169                                 nfs_setattr_update_inode(state->inode, sattr,
3170                                                 opendata->o_res.f_attr);
3171                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
3172                         }
3173                         sattr->ia_valid = ia_old;
3174                 }
3175         }
3176         if (opened && opendata->file_created)
3177                 *opened = 1;
3178
3179         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3180                 *ctx_th = opendata->f_attr.mdsthreshold;
3181                 opendata->f_attr.mdsthreshold = NULL;
3182         }
3183
3184         nfs4_label_free(olabel);
3185
3186         nfs4_opendata_put(opendata);
3187         nfs4_put_state_owner(sp);
3188         return 0;
3189 err_free_label:
3190         nfs4_label_free(olabel);
3191 err_opendata_put:
3192         nfs4_opendata_put(opendata);
3193 err_put_state_owner:
3194         nfs4_put_state_owner(sp);
3195 out_err:
3196         return status;
3197 }
3198
3199
3200 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3201                                         struct nfs_open_context *ctx,
3202                                         int flags,
3203                                         struct iattr *sattr,
3204                                         struct nfs4_label *label,
3205                                         int *opened)
3206 {
3207         struct nfs_server *server = NFS_SERVER(dir);
3208         struct nfs4_exception exception = {
3209                 .interruptible = true,
3210         };
3211         struct nfs4_state *res;
3212         struct nfs4_open_createattrs c = {
3213                 .label = label,
3214                 .sattr = sattr,
3215                 .verf = {
3216                         [0] = (__u32)jiffies,
3217                         [1] = (__u32)current->pid,
3218                 },
3219         };
3220         int status;
3221
3222         do {
3223                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3224                 res = ctx->state;
3225                 trace_nfs4_open_file(ctx, flags, status);
3226                 if (status == 0)
3227                         break;
3228                 /* NOTE: BAD_SEQID means the server and client disagree about the
3229                  * book-keeping w.r.t. state-changing operations
3230                  * (OPEN/CLOSE/LOCK/LOCKU...)
3231                  * It is actually a sign of a bug on the client or on the server.
3232                  *
3233                  * If we receive a BAD_SEQID error in the particular case of
3234                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3235                  * have unhashed the old state_owner for us, and that we can
3236                  * therefore safely retry using a new one. We should still warn
3237                  * the user though...
3238                  */
3239                 if (status == -NFS4ERR_BAD_SEQID) {
3240                         pr_warn_ratelimited("NFS: v4 server %s "
3241                                         " returned a bad sequence-id error!\n",
3242                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3243                         exception.retry = 1;
3244                         continue;
3245                 }
3246                 /*
3247                  * BAD_STATEID on OPEN means that the server cancelled our
3248                  * state before it received the OPEN_CONFIRM.
3249                  * Recover by retrying the request as per the discussion
3250                  * on Page 181 of RFC3530.
3251                  */
3252                 if (status == -NFS4ERR_BAD_STATEID) {
3253                         exception.retry = 1;
3254                         continue;
3255                 }
3256                 if (status == -NFS4ERR_EXPIRED) {
3257                         nfs4_schedule_lease_recovery(server->nfs_client);
3258                         exception.retry = 1;
3259                         continue;
3260                 }
3261                 if (status == -EAGAIN) {
3262                         /* We must have found a delegation */
3263                         exception.retry = 1;
3264                         continue;
3265                 }
3266                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3267                         continue;
3268                 res = ERR_PTR(nfs4_handle_exception(server,
3269                                         status, &exception));
3270         } while (exception.retry);
3271         return res;
3272 }
3273
3274 static int _nfs4_do_setattr(struct inode *inode,
3275                             struct nfs_setattrargs *arg,
3276                             struct nfs_setattrres *res,
3277                             const struct cred *cred,
3278                             struct nfs_open_context *ctx)
3279 {
3280         struct nfs_server *server = NFS_SERVER(inode);
3281         struct rpc_message msg = {
3282                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3283                 .rpc_argp       = arg,
3284                 .rpc_resp       = res,
3285                 .rpc_cred       = cred,
3286         };
3287         const struct cred *delegation_cred = NULL;
3288         unsigned long timestamp = jiffies;
3289         bool truncate;
3290         int status;
3291
3292         nfs_fattr_init(res->fattr);
3293
3294         /* Servers should only apply open mode checks for file size changes */
3295         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3296         if (!truncate) {
3297                 nfs4_inode_make_writeable(inode);
3298                 goto zero_stateid;
3299         }
3300
3301         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3302                 /* Use that stateid */
3303         } else if (ctx != NULL && ctx->state) {
3304                 struct nfs_lock_context *l_ctx;
3305                 if (!nfs4_valid_open_stateid(ctx->state))
3306                         return -EBADF;
3307                 l_ctx = nfs_get_lock_context(ctx);
3308                 if (IS_ERR(l_ctx))
3309                         return PTR_ERR(l_ctx);
3310                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3311                                                 &arg->stateid, &delegation_cred);
3312                 nfs_put_lock_context(l_ctx);
3313                 if (status == -EIO)
3314                         return -EBADF;
3315                 else if (status == -EAGAIN)
3316                         goto zero_stateid;
3317         } else {
3318 zero_stateid:
3319                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3320         }
3321         if (delegation_cred)
3322                 msg.rpc_cred = delegation_cred;
3323
3324         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3325
3326         put_cred(delegation_cred);
3327         if (status == 0 && ctx != NULL)
3328                 renew_lease(server, timestamp);
3329         trace_nfs4_setattr(inode, &arg->stateid, status);
3330         return status;
3331 }
3332
3333 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3334                            struct nfs_fattr *fattr, struct iattr *sattr,
3335                            struct nfs_open_context *ctx, struct nfs4_label *ilabel,
3336                            struct nfs4_label *olabel)
3337 {
3338         struct nfs_server *server = NFS_SERVER(inode);
3339         __u32 bitmask[NFS4_BITMASK_SZ];
3340         struct nfs4_state *state = ctx ? ctx->state : NULL;
3341         struct nfs_setattrargs  arg = {
3342                 .fh             = NFS_FH(inode),
3343                 .iap            = sattr,
3344                 .server         = server,
3345                 .bitmask = bitmask,
3346                 .label          = ilabel,
3347         };
3348         struct nfs_setattrres  res = {
3349                 .fattr          = fattr,
3350                 .label          = olabel,
3351                 .server         = server,
3352         };
3353         struct nfs4_exception exception = {
3354                 .state = state,
3355                 .inode = inode,
3356                 .stateid = &arg.stateid,
3357         };
3358         int err;
3359
3360         do {
3361                 nfs4_bitmap_copy_adjust_setattr(bitmask,
3362                                 nfs4_bitmask(server, olabel),
3363                                 inode);
3364
3365                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3366                 switch (err) {
3367                 case -NFS4ERR_OPENMODE:
3368                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3369                                 pr_warn_once("NFSv4: server %s is incorrectly "
3370                                                 "applying open mode checks to "
3371                                                 "a SETATTR that is not "
3372                                                 "changing file size.\n",
3373                                                 server->nfs_client->cl_hostname);
3374                         }
3375                         if (state && !(state->state & FMODE_WRITE)) {
3376                                 err = -EBADF;
3377                                 if (sattr->ia_valid & ATTR_OPEN)
3378                                         err = -EACCES;
3379                                 goto out;
3380                         }
3381                 }
3382                 err = nfs4_handle_exception(server, err, &exception);
3383         } while (exception.retry);
3384 out:
3385         return err;
3386 }
3387
3388 static bool
3389 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3390 {
3391         if (inode == NULL || !nfs_have_layout(inode))
3392                 return false;
3393
3394         return pnfs_wait_on_layoutreturn(inode, task);
3395 }
3396
3397 /*
3398  * Update the seqid of an open stateid
3399  */
3400 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3401                 struct nfs4_state *state)
3402 {
3403         __be32 seqid_open;
3404         u32 dst_seqid;
3405         int seq;
3406
3407         for (;;) {
3408                 if (!nfs4_valid_open_stateid(state))
3409                         break;
3410                 seq = read_seqbegin(&state->seqlock);
3411                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3412                         nfs4_stateid_copy(dst, &state->open_stateid);
3413                         if (read_seqretry(&state->seqlock, seq))
3414                                 continue;
3415                         break;
3416                 }
3417                 seqid_open = state->open_stateid.seqid;
3418                 if (read_seqretry(&state->seqlock, seq))
3419                         continue;
3420
3421                 dst_seqid = be32_to_cpu(dst->seqid);
3422                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3423                         dst->seqid = seqid_open;
3424                 break;
3425         }
3426 }
3427
3428 /*
3429  * Update the seqid of an open stateid after receiving
3430  * NFS4ERR_OLD_STATEID
3431  */
3432 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3433                 struct nfs4_state *state)
3434 {
3435         __be32 seqid_open;
3436         u32 dst_seqid;
3437         bool ret;
3438         int seq;
3439
3440         for (;;) {
3441                 ret = false;
3442                 if (!nfs4_valid_open_stateid(state))
3443                         break;
3444                 seq = read_seqbegin(&state->seqlock);
3445                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3446                         if (read_seqretry(&state->seqlock, seq))
3447                                 continue;
3448                         break;
3449                 }
3450                 seqid_open = state->open_stateid.seqid;
3451                 if (read_seqretry(&state->seqlock, seq))
3452                         continue;
3453
3454                 dst_seqid = be32_to_cpu(dst->seqid);
3455                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) >= 0)
3456                         dst->seqid = cpu_to_be32(dst_seqid + 1);
3457                 else
3458                         dst->seqid = seqid_open;
3459                 ret = true;
3460                 break;
3461         }
3462
3463         return ret;
3464 }
3465
3466 struct nfs4_closedata {
3467         struct inode *inode;
3468         struct nfs4_state *state;
3469         struct nfs_closeargs arg;
3470         struct nfs_closeres res;
3471         struct {
3472                 struct nfs4_layoutreturn_args arg;
3473                 struct nfs4_layoutreturn_res res;
3474                 struct nfs4_xdr_opaque_data ld_private;
3475                 u32 roc_barrier;
3476                 bool roc;
3477         } lr;
3478         struct nfs_fattr fattr;
3479         unsigned long timestamp;
3480 };
3481
3482 static void nfs4_free_closedata(void *data)
3483 {
3484         struct nfs4_closedata *calldata = data;
3485         struct nfs4_state_owner *sp = calldata->state->owner;
3486         struct super_block *sb = calldata->state->inode->i_sb;
3487
3488         if (calldata->lr.roc)
3489                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3490                                 calldata->res.lr_ret);
3491         nfs4_put_open_state(calldata->state);
3492         nfs_free_seqid(calldata->arg.seqid);
3493         nfs4_put_state_owner(sp);
3494         nfs_sb_deactive(sb);
3495         kfree(calldata);
3496 }
3497
3498 static void nfs4_close_done(struct rpc_task *task, void *data)
3499 {
3500         struct nfs4_closedata *calldata = data;
3501         struct nfs4_state *state = calldata->state;
3502         struct nfs_server *server = NFS_SERVER(calldata->inode);
3503         nfs4_stateid *res_stateid = NULL;
3504         struct nfs4_exception exception = {
3505                 .state = state,
3506                 .inode = calldata->inode,
3507                 .stateid = &calldata->arg.stateid,
3508         };
3509
3510         dprintk("%s: begin!\n", __func__);
3511         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3512                 return;
3513         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3514
3515         /* Handle Layoutreturn errors */
3516         if (pnfs_roc_done(task, calldata->inode,
3517                                 &calldata->arg.lr_args,
3518                                 &calldata->res.lr_res,
3519                                 &calldata->res.lr_ret) == -EAGAIN)
3520                 goto out_restart;
3521
3522         /* hmm. we are done with the inode, and in the process of freeing
3523          * the state_owner. we keep this around to process errors
3524          */
3525         switch (task->tk_status) {
3526                 case 0:
3527                         res_stateid = &calldata->res.stateid;
3528                         renew_lease(server, calldata->timestamp);
3529                         break;
3530                 case -NFS4ERR_ACCESS:
3531                         if (calldata->arg.bitmask != NULL) {
3532                                 calldata->arg.bitmask = NULL;
3533                                 calldata->res.fattr = NULL;
3534                                 goto out_restart;
3535
3536                         }
3537                         break;
3538                 case -NFS4ERR_OLD_STATEID:
3539                         /* Did we race with OPEN? */
3540                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3541                                                 state))
3542                                 goto out_restart;
3543                         goto out_release;
3544                 case -NFS4ERR_ADMIN_REVOKED:
3545                 case -NFS4ERR_STALE_STATEID:
3546                 case -NFS4ERR_EXPIRED:
3547                         nfs4_free_revoked_stateid(server,
3548                                         &calldata->arg.stateid,
3549                                         task->tk_msg.rpc_cred);
3550                         fallthrough;
3551                 case -NFS4ERR_BAD_STATEID:
3552                         if (calldata->arg.fmode == 0)
3553                                 break;
3554                         fallthrough;
3555                 default:
3556                         task->tk_status = nfs4_async_handle_exception(task,
3557                                         server, task->tk_status, &exception);
3558                         if (exception.retry)
3559                                 goto out_restart;
3560         }
3561         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3562                         res_stateid, calldata->arg.fmode);
3563 out_release:
3564         task->tk_status = 0;
3565         nfs_release_seqid(calldata->arg.seqid);
3566         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3567         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3568         return;
3569 out_restart:
3570         task->tk_status = 0;
3571         rpc_restart_call_prepare(task);
3572         goto out_release;
3573 }
3574
3575 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3576 {
3577         struct nfs4_closedata *calldata = data;
3578         struct nfs4_state *state = calldata->state;
3579         struct inode *inode = calldata->inode;
3580         struct pnfs_layout_hdr *lo;
3581         bool is_rdonly, is_wronly, is_rdwr;
3582         int call_close = 0;
3583
3584         dprintk("%s: begin!\n", __func__);
3585         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3586                 goto out_wait;
3587
3588         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3589         spin_lock(&state->owner->so_lock);
3590         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3591         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3592         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3593         /* Calculate the change in open mode */
3594         calldata->arg.fmode = 0;
3595         if (state->n_rdwr == 0) {
3596                 if (state->n_rdonly == 0)
3597                         call_close |= is_rdonly;
3598                 else if (is_rdonly)
3599                         calldata->arg.fmode |= FMODE_READ;
3600                 if (state->n_wronly == 0)
3601                         call_close |= is_wronly;
3602                 else if (is_wronly)
3603                         calldata->arg.fmode |= FMODE_WRITE;
3604                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3605                         call_close |= is_rdwr;
3606         } else if (is_rdwr)
3607                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3608
3609         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3610         if (!nfs4_valid_open_stateid(state))
3611                 call_close = 0;
3612         spin_unlock(&state->owner->so_lock);
3613
3614         if (!call_close) {
3615                 /* Note: exit _without_ calling nfs4_close_done */
3616                 goto out_no_action;
3617         }
3618
3619         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3620                 nfs_release_seqid(calldata->arg.seqid);
3621                 goto out_wait;
3622         }
3623
3624         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3625         if (lo && !pnfs_layout_is_valid(lo)) {
3626                 calldata->arg.lr_args = NULL;
3627                 calldata->res.lr_res = NULL;
3628         }
3629
3630         if (calldata->arg.fmode == 0)
3631                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3632
3633         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3634                 /* Close-to-open cache consistency revalidation */
3635                 if (!nfs4_have_delegation(inode, FMODE_READ))
3636                         calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3637                 else
3638                         calldata->arg.bitmask = NULL;
3639         }
3640
3641         calldata->arg.share_access =
3642                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3643                                 calldata->arg.fmode, 0);
3644
3645         if (calldata->res.fattr == NULL)
3646                 calldata->arg.bitmask = NULL;
3647         else if (calldata->arg.bitmask == NULL)
3648                 calldata->res.fattr = NULL;
3649         calldata->timestamp = jiffies;
3650         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3651                                 &calldata->arg.seq_args,
3652                                 &calldata->res.seq_res,
3653                                 task) != 0)
3654                 nfs_release_seqid(calldata->arg.seqid);
3655         dprintk("%s: done!\n", __func__);
3656         return;
3657 out_no_action:
3658         task->tk_action = NULL;
3659 out_wait:
3660         nfs4_sequence_done(task, &calldata->res.seq_res);
3661 }
3662
3663 static const struct rpc_call_ops nfs4_close_ops = {
3664         .rpc_call_prepare = nfs4_close_prepare,
3665         .rpc_call_done = nfs4_close_done,
3666         .rpc_release = nfs4_free_closedata,
3667 };
3668
3669 /*
3670  * It is possible for data to be read/written from a mem-mapped file
3671  * after the sys_close call (which hits the vfs layer as a flush).
3672  * This means that we can't safely call nfsv4 close on a file until
3673  * the inode is cleared. This in turn means that we are not good
3674  * NFSv4 citizens - we do not indicate to the server to update the file's
3675  * share state even when we are done with one of the three share
3676  * stateid's in the inode.
3677  *
3678  * NOTE: Caller must be holding the sp->so_owner semaphore!
3679  */
3680 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3681 {
3682         struct nfs_server *server = NFS_SERVER(state->inode);
3683         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3684         struct nfs4_closedata *calldata;
3685         struct nfs4_state_owner *sp = state->owner;
3686         struct rpc_task *task;
3687         struct rpc_message msg = {
3688                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3689                 .rpc_cred = state->owner->so_cred,
3690         };
3691         struct rpc_task_setup task_setup_data = {
3692                 .rpc_client = server->client,
3693                 .rpc_message = &msg,
3694                 .callback_ops = &nfs4_close_ops,
3695                 .workqueue = nfsiod_workqueue,
3696                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3697         };
3698         int status = -ENOMEM;
3699
3700         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3701                 &task_setup_data.rpc_client, &msg);
3702
3703         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3704         if (calldata == NULL)
3705                 goto out;
3706         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3707         calldata->inode = state->inode;
3708         calldata->state = state;
3709         calldata->arg.fh = NFS_FH(state->inode);
3710         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3711                 goto out_free_calldata;
3712         /* Serialization for the sequence id */
3713         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3714         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3715         if (IS_ERR(calldata->arg.seqid))
3716                 goto out_free_calldata;
3717         nfs_fattr_init(&calldata->fattr);
3718         calldata->arg.fmode = 0;
3719         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3720         calldata->res.fattr = &calldata->fattr;
3721         calldata->res.seqid = calldata->arg.seqid;
3722         calldata->res.server = server;
3723         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3724         calldata->lr.roc = pnfs_roc(state->inode,
3725                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3726         if (calldata->lr.roc) {
3727                 calldata->arg.lr_args = &calldata->lr.arg;
3728                 calldata->res.lr_res = &calldata->lr.res;
3729         }
3730         nfs_sb_active(calldata->inode->i_sb);
3731
3732         msg.rpc_argp = &calldata->arg;
3733         msg.rpc_resp = &calldata->res;
3734         task_setup_data.callback_data = calldata;
3735         task = rpc_run_task(&task_setup_data);
3736         if (IS_ERR(task))
3737                 return PTR_ERR(task);
3738         status = 0;
3739         if (wait)
3740                 status = rpc_wait_for_completion_task(task);
3741         rpc_put_task(task);
3742         return status;
3743 out_free_calldata:
3744         kfree(calldata);
3745 out:
3746         nfs4_put_open_state(state);
3747         nfs4_put_state_owner(sp);
3748         return status;
3749 }
3750
3751 static struct inode *
3752 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3753                 int open_flags, struct iattr *attr, int *opened)
3754 {
3755         struct nfs4_state *state;
3756         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3757
3758         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3759
3760         /* Protect against concurrent sillydeletes */
3761         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3762
3763         nfs4_label_release_security(label);
3764
3765         if (IS_ERR(state))
3766                 return ERR_CAST(state);
3767         return state->inode;
3768 }
3769
3770 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3771 {
3772         if (ctx->state == NULL)
3773                 return;
3774         if (is_sync)
3775                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3776         else
3777                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3778 }
3779
3780 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3781 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3782 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3783
3784 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3785 {
3786         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3787         struct nfs4_server_caps_arg args = {
3788                 .fhandle = fhandle,
3789                 .bitmask = bitmask,
3790         };
3791         struct nfs4_server_caps_res res = {};
3792         struct rpc_message msg = {
3793                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3794                 .rpc_argp = &args,
3795                 .rpc_resp = &res,
3796         };
3797         int status;
3798         int i;
3799
3800         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3801                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3802                      FATTR4_WORD0_LINK_SUPPORT |
3803                      FATTR4_WORD0_SYMLINK_SUPPORT |
3804                      FATTR4_WORD0_ACLSUPPORT;
3805         if (minorversion)
3806                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3807
3808         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3809         if (status == 0) {
3810                 /* Sanity check the server answers */
3811                 switch (minorversion) {
3812                 case 0:
3813                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3814                         res.attr_bitmask[2] = 0;
3815                         break;
3816                 case 1:
3817                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3818                         break;
3819                 case 2:
3820                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3821                 }
3822                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3823                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3824                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3825                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3826                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3827                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3828                                 NFS_CAP_SECURITY_LABEL);
3829                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3830                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3831                         server->caps |= NFS_CAP_ACLS;
3832                 if (res.has_links != 0)
3833                         server->caps |= NFS_CAP_HARDLINKS;
3834                 if (res.has_symlinks != 0)
3835                         server->caps |= NFS_CAP_SYMLINKS;
3836                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3837                         server->caps |= NFS_CAP_FILEID;
3838                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3839                         server->caps |= NFS_CAP_MODE;
3840                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3841                         server->caps |= NFS_CAP_NLINK;
3842                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3843                         server->caps |= NFS_CAP_OWNER;
3844                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3845                         server->caps |= NFS_CAP_OWNER_GROUP;
3846                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3847                         server->caps |= NFS_CAP_ATIME;
3848                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3849                         server->caps |= NFS_CAP_CTIME;
3850                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3851                         server->caps |= NFS_CAP_MTIME;
3852 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3853                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3854                         server->caps |= NFS_CAP_SECURITY_LABEL;
3855 #endif
3856                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3857                                 sizeof(server->attr_bitmask));
3858                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3859
3860                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3861                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3862                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3863                 server->cache_consistency_bitmask[2] = 0;
3864
3865                 /* Avoid a regression due to buggy server */
3866                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3867                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3868                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3869                         sizeof(server->exclcreat_bitmask));
3870
3871                 server->acl_bitmask = res.acl_bitmask;
3872                 server->fh_expire_type = res.fh_expire_type;
3873         }
3874
3875         return status;
3876 }
3877
3878 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3879 {
3880         struct nfs4_exception exception = {
3881                 .interruptible = true,
3882         };
3883         int err;
3884         do {
3885                 err = nfs4_handle_exception(server,
3886                                 _nfs4_server_capabilities(server, fhandle),
3887                                 &exception);
3888         } while (exception.retry);
3889         return err;
3890 }
3891
3892 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3893                 struct nfs_fsinfo *info)
3894 {
3895         u32 bitmask[3];
3896         struct nfs4_lookup_root_arg args = {
3897                 .bitmask = bitmask,
3898         };
3899         struct nfs4_lookup_res res = {
3900                 .server = server,
3901                 .fattr = info->fattr,
3902                 .fh = fhandle,
3903         };
3904         struct rpc_message msg = {
3905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3906                 .rpc_argp = &args,
3907                 .rpc_resp = &res,
3908         };
3909
3910         bitmask[0] = nfs4_fattr_bitmap[0];
3911         bitmask[1] = nfs4_fattr_bitmap[1];
3912         /*
3913          * Process the label in the upcoming getfattr
3914          */
3915         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3916
3917         nfs_fattr_init(info->fattr);
3918         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3919 }
3920
3921 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3922                 struct nfs_fsinfo *info)
3923 {
3924         struct nfs4_exception exception = {
3925                 .interruptible = true,
3926         };
3927         int err;
3928         do {
3929                 err = _nfs4_lookup_root(server, fhandle, info);
3930                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3931                 switch (err) {
3932                 case 0:
3933                 case -NFS4ERR_WRONGSEC:
3934                         goto out;
3935                 default:
3936                         err = nfs4_handle_exception(server, err, &exception);
3937                 }
3938         } while (exception.retry);
3939 out:
3940         return err;
3941 }
3942
3943 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3944                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3945 {
3946         struct rpc_auth_create_args auth_args = {
3947                 .pseudoflavor = flavor,
3948         };
3949         struct rpc_auth *auth;
3950
3951         auth = rpcauth_create(&auth_args, server->client);
3952         if (IS_ERR(auth))
3953                 return -EACCES;
3954         return nfs4_lookup_root(server, fhandle, info);
3955 }
3956
3957 /*
3958  * Retry pseudoroot lookup with various security flavors.  We do this when:
3959  *
3960  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3961  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3962  *
3963  * Returns zero on success, or a negative NFS4ERR value, or a
3964  * negative errno value.
3965  */
3966 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3967                               struct nfs_fsinfo *info)
3968 {
3969         /* Per 3530bis 15.33.5 */
3970         static const rpc_authflavor_t flav_array[] = {
3971                 RPC_AUTH_GSS_KRB5P,
3972                 RPC_AUTH_GSS_KRB5I,
3973                 RPC_AUTH_GSS_KRB5,
3974                 RPC_AUTH_UNIX,                  /* courtesy */
3975                 RPC_AUTH_NULL,
3976         };
3977         int status = -EPERM;
3978         size_t i;
3979
3980         if (server->auth_info.flavor_len > 0) {
3981                 /* try each flavor specified by user */
3982                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3983                         status = nfs4_lookup_root_sec(server, fhandle, info,
3984                                                 server->auth_info.flavors[i]);
3985                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3986                                 continue;
3987                         break;
3988                 }
3989         } else {
3990                 /* no flavors specified by user, try default list */
3991                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3992                         status = nfs4_lookup_root_sec(server, fhandle, info,
3993                                                       flav_array[i]);
3994                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3995                                 continue;
3996                         break;
3997                 }
3998         }
3999
4000         /*
4001          * -EACCES could mean that the user doesn't have correct permissions
4002          * to access the mount.  It could also mean that we tried to mount
4003          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4004          * existing mount programs don't handle -EACCES very well so it should
4005          * be mapped to -EPERM instead.
4006          */
4007         if (status == -EACCES)
4008                 status = -EPERM;
4009         return status;
4010 }
4011
4012 /**
4013  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4014  * @server: initialized nfs_server handle
4015  * @fhandle: we fill in the pseudo-fs root file handle
4016  * @info: we fill in an FSINFO struct
4017  * @auth_probe: probe the auth flavours
4018  *
4019  * Returns zero on success, or a negative errno.
4020  */
4021 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4022                          struct nfs_fsinfo *info,
4023                          bool auth_probe)
4024 {
4025         int status = 0;
4026
4027         if (!auth_probe)
4028                 status = nfs4_lookup_root(server, fhandle, info);
4029
4030         if (auth_probe || status == NFS4ERR_WRONGSEC)
4031                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4032                                 fhandle, info);
4033
4034         if (status == 0)
4035                 status = nfs4_server_capabilities(server, fhandle);
4036         if (status == 0)
4037                 status = nfs4_do_fsinfo(server, fhandle, info);
4038
4039         return nfs4_map_errors(status);
4040 }
4041
4042 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4043                               struct nfs_fsinfo *info)
4044 {
4045         int error;
4046         struct nfs_fattr *fattr = info->fattr;
4047         struct nfs4_label *label = fattr->label;
4048
4049         error = nfs4_server_capabilities(server, mntfh);
4050         if (error < 0) {
4051                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4052                 return error;
4053         }
4054
4055         error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL);
4056         if (error < 0) {
4057                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4058                 goto out;
4059         }
4060
4061         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4062             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4063                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4064
4065 out:
4066         return error;
4067 }
4068
4069 /*
4070  * Get locations and (maybe) other attributes of a referral.
4071  * Note that we'll actually follow the referral later when
4072  * we detect fsid mismatch in inode revalidation
4073  */
4074 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4075                              const struct qstr *name, struct nfs_fattr *fattr,
4076                              struct nfs_fh *fhandle)
4077 {
4078         int status = -ENOMEM;
4079         struct page *page = NULL;
4080         struct nfs4_fs_locations *locations = NULL;
4081
4082         page = alloc_page(GFP_KERNEL);
4083         if (page == NULL)
4084                 goto out;
4085         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4086         if (locations == NULL)
4087                 goto out;
4088
4089         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4090         if (status != 0)
4091                 goto out;
4092
4093         /*
4094          * If the fsid didn't change, this is a migration event, not a
4095          * referral.  Cause us to drop into the exception handler, which
4096          * will kick off migration recovery.
4097          */
4098         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
4099                 dprintk("%s: server did not return a different fsid for"
4100                         " a referral at %s\n", __func__, name->name);
4101                 status = -NFS4ERR_MOVED;
4102                 goto out;
4103         }
4104         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4105         nfs_fixup_referral_attributes(&locations->fattr);
4106
4107         /* replace the lookup nfs_fattr with the locations nfs_fattr */
4108         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
4109         memset(fhandle, 0, sizeof(struct nfs_fh));
4110 out:
4111         if (page)
4112                 __free_page(page);
4113         kfree(locations);
4114         return status;
4115 }
4116
4117 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4118                                 struct nfs_fattr *fattr, struct nfs4_label *label,
4119                                 struct inode *inode)
4120 {
4121         __u32 bitmask[NFS4_BITMASK_SZ];
4122         struct nfs4_getattr_arg args = {
4123                 .fh = fhandle,
4124                 .bitmask = bitmask,
4125         };
4126         struct nfs4_getattr_res res = {
4127                 .fattr = fattr,
4128                 .label = label,
4129                 .server = server,
4130         };
4131         struct rpc_message msg = {
4132                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4133                 .rpc_argp = &args,
4134                 .rpc_resp = &res,
4135         };
4136         unsigned short task_flags = 0;
4137
4138         /* Is this is an attribute revalidation, subject to softreval? */
4139         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4140                 task_flags |= RPC_TASK_TIMEOUT;
4141
4142         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode);
4143
4144         nfs_fattr_init(fattr);
4145         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4146         return nfs4_do_call_sync(server->client, server, &msg,
4147                         &args.seq_args, &res.seq_res, task_flags);
4148 }
4149
4150 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4151                                 struct nfs_fattr *fattr, struct nfs4_label *label,
4152                                 struct inode *inode)
4153 {
4154         struct nfs4_exception exception = {
4155                 .interruptible = true,
4156         };
4157         int err;
4158         do {
4159                 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode);
4160                 trace_nfs4_getattr(server, fhandle, fattr, err);
4161                 err = nfs4_handle_exception(server, err,
4162                                 &exception);
4163         } while (exception.retry);
4164         return err;
4165 }
4166
4167 /*
4168  * The file is not closed if it is opened due to the a request to change
4169  * the size of the file. The open call will not be needed once the
4170  * VFS layer lookup-intents are implemented.
4171  *
4172  * Close is called when the inode is destroyed.
4173  * If we haven't opened the file for O_WRONLY, we
4174  * need to in the size_change case to obtain a stateid.
4175  *
4176  * Got race?
4177  * Because OPEN is always done by name in nfsv4, it is
4178  * possible that we opened a different file by the same
4179  * name.  We can recognize this race condition, but we
4180  * can't do anything about it besides returning an error.
4181  *
4182  * This will be fixed with VFS changes (lookup-intent).
4183  */
4184 static int
4185 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4186                   struct iattr *sattr)
4187 {
4188         struct inode *inode = d_inode(dentry);
4189         const struct cred *cred = NULL;
4190         struct nfs_open_context *ctx = NULL;
4191         struct nfs4_label *label = NULL;
4192         int status;
4193
4194         if (pnfs_ld_layoutret_on_setattr(inode) &&
4195             sattr->ia_valid & ATTR_SIZE &&
4196             sattr->ia_size < i_size_read(inode))
4197                 pnfs_commit_and_return_layout(inode);
4198
4199         nfs_fattr_init(fattr);
4200
4201         /* Deal with open(O_TRUNC) */
4202         if (sattr->ia_valid & ATTR_OPEN)
4203                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4204
4205         /* Optimization: if the end result is no change, don't RPC */
4206         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4207                 return 0;
4208
4209         /* Search for an existing open(O_WRITE) file */
4210         if (sattr->ia_valid & ATTR_FILE) {
4211
4212                 ctx = nfs_file_open_context(sattr->ia_file);
4213                 if (ctx)
4214                         cred = ctx->cred;
4215         }
4216
4217         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4218         if (IS_ERR(label))
4219                 return PTR_ERR(label);
4220
4221         /* Return any delegations if we're going to change ACLs */
4222         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4223                 nfs4_inode_make_writeable(inode);
4224
4225         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label);
4226         if (status == 0) {
4227                 nfs_setattr_update_inode(inode, sattr, fattr);
4228                 nfs_setsecurity(inode, fattr, label);
4229         }
4230         nfs4_label_free(label);
4231         return status;
4232 }
4233
4234 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4235                 struct dentry *dentry, struct nfs_fh *fhandle,
4236                 struct nfs_fattr *fattr, struct nfs4_label *label)
4237 {
4238         struct nfs_server *server = NFS_SERVER(dir);
4239         int                    status;
4240         struct nfs4_lookup_arg args = {
4241                 .bitmask = server->attr_bitmask,
4242                 .dir_fh = NFS_FH(dir),
4243                 .name = &dentry->d_name,
4244         };
4245         struct nfs4_lookup_res res = {
4246                 .server = server,
4247                 .fattr = fattr,
4248                 .label = label,
4249                 .fh = fhandle,
4250         };
4251         struct rpc_message msg = {
4252                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4253                 .rpc_argp = &args,
4254                 .rpc_resp = &res,
4255         };
4256         unsigned short task_flags = 0;
4257
4258         /* Is this is an attribute revalidation, subject to softreval? */
4259         if (nfs_lookup_is_soft_revalidate(dentry))
4260                 task_flags |= RPC_TASK_TIMEOUT;
4261
4262         args.bitmask = nfs4_bitmask(server, label);
4263
4264         nfs_fattr_init(fattr);
4265
4266         dprintk("NFS call  lookup %pd2\n", dentry);
4267         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4268         status = nfs4_do_call_sync(clnt, server, &msg,
4269                         &args.seq_args, &res.seq_res, task_flags);
4270         dprintk("NFS reply lookup: %d\n", status);
4271         return status;
4272 }
4273
4274 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4275 {
4276         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4277                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4278         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4279         fattr->nlink = 2;
4280 }
4281
4282 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4283                                    struct dentry *dentry, struct nfs_fh *fhandle,
4284                                    struct nfs_fattr *fattr, struct nfs4_label *label)
4285 {
4286         struct nfs4_exception exception = {
4287                 .interruptible = true,
4288         };
4289         struct rpc_clnt *client = *clnt;
4290         const struct qstr *name = &dentry->d_name;
4291         int err;
4292         do {
4293                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr, label);
4294                 trace_nfs4_lookup(dir, name, err);
4295                 switch (err) {
4296                 case -NFS4ERR_BADNAME:
4297                         err = -ENOENT;
4298                         goto out;
4299                 case -NFS4ERR_MOVED:
4300                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4301                         if (err == -NFS4ERR_MOVED)
4302                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4303                         goto out;
4304                 case -NFS4ERR_WRONGSEC:
4305                         err = -EPERM;
4306                         if (client != *clnt)
4307                                 goto out;
4308                         client = nfs4_negotiate_security(client, dir, name);
4309                         if (IS_ERR(client))
4310                                 return PTR_ERR(client);
4311
4312                         exception.retry = 1;
4313                         break;
4314                 default:
4315                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4316                 }
4317         } while (exception.retry);
4318
4319 out:
4320         if (err == 0)
4321                 *clnt = client;
4322         else if (client != *clnt)
4323                 rpc_shutdown_client(client);
4324
4325         return err;
4326 }
4327
4328 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4329                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4330                             struct nfs4_label *label)
4331 {
4332         int status;
4333         struct rpc_clnt *client = NFS_CLIENT(dir);
4334
4335         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, label);
4336         if (client != NFS_CLIENT(dir)) {
4337                 rpc_shutdown_client(client);
4338                 nfs_fixup_secinfo_attributes(fattr);
4339         }
4340         return status;
4341 }
4342
4343 struct rpc_clnt *
4344 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4345                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4346 {
4347         struct rpc_clnt *client = NFS_CLIENT(dir);
4348         int status;
4349
4350         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, NULL);
4351         if (status < 0)
4352                 return ERR_PTR(status);
4353         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4354 }
4355
4356 static int _nfs4_proc_lookupp(struct inode *inode,
4357                 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4358                 struct nfs4_label *label)
4359 {
4360         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4361         struct nfs_server *server = NFS_SERVER(inode);
4362         int                    status;
4363         struct nfs4_lookupp_arg args = {
4364                 .bitmask = server->attr_bitmask,
4365                 .fh = NFS_FH(inode),
4366         };
4367         struct nfs4_lookupp_res res = {
4368                 .server = server,
4369                 .fattr = fattr,
4370                 .label = label,
4371                 .fh = fhandle,
4372         };
4373         struct rpc_message msg = {
4374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4375                 .rpc_argp = &args,
4376                 .rpc_resp = &res,
4377         };
4378
4379         args.bitmask = nfs4_bitmask(server, label);
4380
4381         nfs_fattr_init(fattr);
4382
4383         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4384         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4385                                 &res.seq_res, 0);
4386         dprintk("NFS reply lookupp: %d\n", status);
4387         return status;
4388 }
4389
4390 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4391                              struct nfs_fattr *fattr, struct nfs4_label *label)
4392 {
4393         struct nfs4_exception exception = {
4394                 .interruptible = true,
4395         };
4396         int err;
4397         do {
4398                 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label);
4399                 trace_nfs4_lookupp(inode, err);
4400                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4401                                 &exception);
4402         } while (exception.retry);
4403         return err;
4404 }
4405
4406 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4407 {
4408         struct nfs_server *server = NFS_SERVER(inode);
4409         struct nfs4_accessargs args = {
4410                 .fh = NFS_FH(inode),
4411                 .access = entry->mask,
4412         };
4413         struct nfs4_accessres res = {
4414                 .server = server,
4415         };
4416         struct rpc_message msg = {
4417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4418                 .rpc_argp = &args,
4419                 .rpc_resp = &res,
4420                 .rpc_cred = entry->cred,
4421         };
4422         int status = 0;
4423
4424         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4425                 res.fattr = nfs_alloc_fattr();
4426                 if (res.fattr == NULL)
4427                         return -ENOMEM;
4428                 args.bitmask = server->cache_consistency_bitmask;
4429         }
4430         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4431         if (!status) {
4432                 nfs_access_set_mask(entry, res.access);
4433                 if (res.fattr)
4434                         nfs_refresh_inode(inode, res.fattr);
4435         }
4436         nfs_free_fattr(res.fattr);
4437         return status;
4438 }
4439
4440 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4441 {
4442         struct nfs4_exception exception = {
4443                 .interruptible = true,
4444         };
4445         int err;
4446         do {
4447                 err = _nfs4_proc_access(inode, entry);
4448                 trace_nfs4_access(inode, err);
4449                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4450                                 &exception);
4451         } while (exception.retry);
4452         return err;
4453 }
4454
4455 /*
4456  * TODO: For the time being, we don't try to get any attributes
4457  * along with any of the zero-copy operations READ, READDIR,
4458  * READLINK, WRITE.
4459  *
4460  * In the case of the first three, we want to put the GETATTR
4461  * after the read-type operation -- this is because it is hard
4462  * to predict the length of a GETATTR response in v4, and thus
4463  * align the READ data correctly.  This means that the GETATTR
4464  * may end up partially falling into the page cache, and we should
4465  * shift it into the 'tail' of the xdr_buf before processing.
4466  * To do this efficiently, we need to know the total length
4467  * of data received, which doesn't seem to be available outside
4468  * of the RPC layer.
4469  *
4470  * In the case of WRITE, we also want to put the GETATTR after
4471  * the operation -- in this case because we want to make sure
4472  * we get the post-operation mtime and size.
4473  *
4474  * Both of these changes to the XDR layer would in fact be quite
4475  * minor, but I decided to leave them for a subsequent patch.
4476  */
4477 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4478                 unsigned int pgbase, unsigned int pglen)
4479 {
4480         struct nfs4_readlink args = {
4481                 .fh       = NFS_FH(inode),
4482                 .pgbase   = pgbase,
4483                 .pglen    = pglen,
4484                 .pages    = &page,
4485         };
4486         struct nfs4_readlink_res res;
4487         struct rpc_message msg = {
4488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4489                 .rpc_argp = &args,
4490                 .rpc_resp = &res,
4491         };
4492
4493         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4494 }
4495
4496 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4497                 unsigned int pgbase, unsigned int pglen)
4498 {
4499         struct nfs4_exception exception = {
4500                 .interruptible = true,
4501         };
4502         int err;
4503         do {
4504                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4505                 trace_nfs4_readlink(inode, err);
4506                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4507                                 &exception);
4508         } while (exception.retry);
4509         return err;
4510 }
4511
4512 /*
4513  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4514  */
4515 static int
4516 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4517                  int flags)
4518 {
4519         struct nfs_server *server = NFS_SERVER(dir);
4520         struct nfs4_label l, *ilabel = NULL;
4521         struct nfs_open_context *ctx;
4522         struct nfs4_state *state;
4523         int status = 0;
4524
4525         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4526         if (IS_ERR(ctx))
4527                 return PTR_ERR(ctx);
4528
4529         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4530
4531         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4532                 sattr->ia_mode &= ~current_umask();
4533         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4534         if (IS_ERR(state)) {
4535                 status = PTR_ERR(state);
4536                 goto out;
4537         }
4538 out:
4539         nfs4_label_release_security(ilabel);
4540         put_nfs_open_context(ctx);
4541         return status;
4542 }
4543
4544 static int
4545 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4546 {
4547         struct nfs_server *server = NFS_SERVER(dir);
4548         struct nfs_removeargs args = {
4549                 .fh = NFS_FH(dir),
4550                 .name = *name,
4551         };
4552         struct nfs_removeres res = {
4553                 .server = server,
4554         };
4555         struct rpc_message msg = {
4556                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4557                 .rpc_argp = &args,
4558                 .rpc_resp = &res,
4559         };
4560         unsigned long timestamp = jiffies;
4561         int status;
4562
4563         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4564         if (status == 0) {
4565                 spin_lock(&dir->i_lock);
4566                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4567                                               NFS_INO_INVALID_DATA);
4568                 /* Removing a directory decrements nlink in the parent */
4569                 if (ftype == NF4DIR && dir->i_nlink > 2)
4570                         nfs4_dec_nlink_locked(dir);
4571                 spin_unlock(&dir->i_lock);
4572         }
4573         return status;
4574 }
4575
4576 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4577 {
4578         struct nfs4_exception exception = {
4579                 .interruptible = true,
4580         };
4581         struct inode *inode = d_inode(dentry);
4582         int err;
4583
4584         if (inode) {
4585                 if (inode->i_nlink == 1)
4586                         nfs4_inode_return_delegation(inode);
4587                 else
4588                         nfs4_inode_make_writeable(inode);
4589         }
4590         do {
4591                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4592                 trace_nfs4_remove(dir, &dentry->d_name, err);
4593                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4594                                 &exception);
4595         } while (exception.retry);
4596         return err;
4597 }
4598
4599 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4600 {
4601         struct nfs4_exception exception = {
4602                 .interruptible = true,
4603         };
4604         int err;
4605
4606         do {
4607                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4608                 trace_nfs4_remove(dir, name, err);
4609                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4610                                 &exception);
4611         } while (exception.retry);
4612         return err;
4613 }
4614
4615 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4616                 struct dentry *dentry,
4617                 struct inode *inode)
4618 {
4619         struct nfs_removeargs *args = msg->rpc_argp;
4620         struct nfs_removeres *res = msg->rpc_resp;
4621
4622         res->server = NFS_SB(dentry->d_sb);
4623         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4624         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4625
4626         nfs_fattr_init(res->dir_attr);
4627
4628         if (inode)
4629                 nfs4_inode_return_delegation(inode);
4630 }
4631
4632 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4633 {
4634         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4635                         &data->args.seq_args,
4636                         &data->res.seq_res,
4637                         task);
4638 }
4639
4640 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4641 {
4642         struct nfs_unlinkdata *data = task->tk_calldata;
4643         struct nfs_removeres *res = &data->res;
4644
4645         if (!nfs4_sequence_done(task, &res->seq_res))
4646                 return 0;
4647         if (nfs4_async_handle_error(task, res->server, NULL,
4648                                     &data->timeout) == -EAGAIN)
4649                 return 0;
4650         if (task->tk_status == 0)
4651                 nfs4_update_changeattr(dir, &res->cinfo,
4652                                 res->dir_attr->time_start,
4653                                 NFS_INO_INVALID_DATA);
4654         return 1;
4655 }
4656
4657 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4658                 struct dentry *old_dentry,
4659                 struct dentry *new_dentry)
4660 {
4661         struct nfs_renameargs *arg = msg->rpc_argp;
4662         struct nfs_renameres *res = msg->rpc_resp;
4663         struct inode *old_inode = d_inode(old_dentry);
4664         struct inode *new_inode = d_inode(new_dentry);
4665
4666         if (old_inode)
4667                 nfs4_inode_make_writeable(old_inode);
4668         if (new_inode)
4669                 nfs4_inode_return_delegation(new_inode);
4670         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4671         res->server = NFS_SB(old_dentry->d_sb);
4672         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4673 }
4674
4675 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4676 {
4677         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4678                         &data->args.seq_args,
4679                         &data->res.seq_res,
4680                         task);
4681 }
4682
4683 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4684                                  struct inode *new_dir)
4685 {
4686         struct nfs_renamedata *data = task->tk_calldata;
4687         struct nfs_renameres *res = &data->res;
4688
4689         if (!nfs4_sequence_done(task, &res->seq_res))
4690                 return 0;
4691         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4692                 return 0;
4693
4694         if (task->tk_status == 0) {
4695                 if (new_dir != old_dir) {
4696                         /* Note: If we moved a directory, nlink will change */
4697                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4698                                         res->old_fattr->time_start,
4699                                         NFS_INO_INVALID_OTHER |
4700                                             NFS_INO_INVALID_DATA);
4701                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4702                                         res->new_fattr->time_start,
4703                                         NFS_INO_INVALID_OTHER |
4704                                             NFS_INO_INVALID_DATA);
4705                 } else
4706                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4707                                         res->old_fattr->time_start,
4708                                         NFS_INO_INVALID_DATA);
4709         }
4710         return 1;
4711 }
4712
4713 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4714 {
4715         struct nfs_server *server = NFS_SERVER(inode);
4716         __u32 bitmask[NFS4_BITMASK_SZ];
4717         struct nfs4_link_arg arg = {
4718                 .fh     = NFS_FH(inode),
4719                 .dir_fh = NFS_FH(dir),
4720                 .name   = name,
4721                 .bitmask = bitmask,
4722         };
4723         struct nfs4_link_res res = {
4724                 .server = server,
4725                 .label = NULL,
4726         };
4727         struct rpc_message msg = {
4728                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4729                 .rpc_argp = &arg,
4730                 .rpc_resp = &res,
4731         };
4732         int status = -ENOMEM;
4733
4734         res.fattr = nfs_alloc_fattr();
4735         if (res.fattr == NULL)
4736                 goto out;
4737
4738         res.label = nfs4_label_alloc(server, GFP_KERNEL);
4739         if (IS_ERR(res.label)) {
4740                 status = PTR_ERR(res.label);
4741                 goto out;
4742         }
4743
4744         nfs4_inode_make_writeable(inode);
4745         nfs4_bitmap_copy_adjust_setattr(bitmask, nfs4_bitmask(server, res.label), inode);
4746
4747         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4748         if (!status) {
4749                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4750                                        NFS_INO_INVALID_DATA);
4751                 status = nfs_post_op_update_inode(inode, res.fattr);
4752                 if (!status)
4753                         nfs_setsecurity(inode, res.fattr, res.label);
4754         }
4755
4756
4757         nfs4_label_free(res.label);
4758
4759 out:
4760         nfs_free_fattr(res.fattr);
4761         return status;
4762 }
4763
4764 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4765 {
4766         struct nfs4_exception exception = {
4767                 .interruptible = true,
4768         };
4769         int err;
4770         do {
4771                 err = nfs4_handle_exception(NFS_SERVER(inode),
4772                                 _nfs4_proc_link(inode, dir, name),
4773                                 &exception);
4774         } while (exception.retry);
4775         return err;
4776 }
4777
4778 struct nfs4_createdata {
4779         struct rpc_message msg;
4780         struct nfs4_create_arg arg;
4781         struct nfs4_create_res res;
4782         struct nfs_fh fh;
4783         struct nfs_fattr fattr;
4784         struct nfs4_label *label;
4785 };
4786
4787 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4788                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4789 {
4790         struct nfs4_createdata *data;
4791
4792         data = kzalloc(sizeof(*data), GFP_KERNEL);
4793         if (data != NULL) {
4794                 struct nfs_server *server = NFS_SERVER(dir);
4795
4796                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4797                 if (IS_ERR(data->label))
4798                         goto out_free;
4799
4800                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4801                 data->msg.rpc_argp = &data->arg;
4802                 data->msg.rpc_resp = &data->res;
4803                 data->arg.dir_fh = NFS_FH(dir);
4804                 data->arg.server = server;
4805                 data->arg.name = name;
4806                 data->arg.attrs = sattr;
4807                 data->arg.ftype = ftype;
4808                 data->arg.bitmask = nfs4_bitmask(server, data->label);
4809                 data->arg.umask = current_umask();
4810                 data->res.server = server;
4811                 data->res.fh = &data->fh;
4812                 data->res.fattr = &data->fattr;
4813                 data->res.label = data->label;
4814                 nfs_fattr_init(data->res.fattr);
4815         }
4816         return data;
4817 out_free:
4818         kfree(data);
4819         return NULL;
4820 }
4821
4822 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4823 {
4824         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4825                                     &data->arg.seq_args, &data->res.seq_res, 1);
4826         if (status == 0) {
4827                 spin_lock(&dir->i_lock);
4828                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
4829                                 data->res.fattr->time_start,
4830                                 NFS_INO_INVALID_DATA);
4831                 /* Creating a directory bumps nlink in the parent */
4832                 if (data->arg.ftype == NF4DIR)
4833                         nfs4_inc_nlink_locked(dir);
4834                 spin_unlock(&dir->i_lock);
4835                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4836         }
4837         return status;
4838 }
4839
4840 static void nfs4_free_createdata(struct nfs4_createdata *data)
4841 {
4842         nfs4_label_free(data->label);
4843         kfree(data);
4844 }
4845
4846 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4847                 struct page *page, unsigned int len, struct iattr *sattr,
4848                 struct nfs4_label *label)
4849 {
4850         struct nfs4_createdata *data;
4851         int status = -ENAMETOOLONG;
4852
4853         if (len > NFS4_MAXPATHLEN)
4854                 goto out;
4855
4856         status = -ENOMEM;
4857         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4858         if (data == NULL)
4859                 goto out;
4860
4861         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4862         data->arg.u.symlink.pages = &page;
4863         data->arg.u.symlink.len = len;
4864         data->arg.label = label;
4865
4866         status = nfs4_do_create(dir, dentry, data);
4867
4868         nfs4_free_createdata(data);
4869 out:
4870         return status;
4871 }
4872
4873 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4874                 struct page *page, unsigned int len, struct iattr *sattr)
4875 {
4876         struct nfs4_exception exception = {
4877                 .interruptible = true,
4878         };
4879         struct nfs4_label l, *label = NULL;
4880         int err;
4881
4882         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4883
4884         do {
4885                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4886                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4887                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4888                                 &exception);
4889         } while (exception.retry);
4890
4891         nfs4_label_release_security(label);
4892         return err;
4893 }
4894
4895 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4896                 struct iattr *sattr, struct nfs4_label *label)
4897 {
4898         struct nfs4_createdata *data;
4899         int status = -ENOMEM;
4900
4901         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4902         if (data == NULL)
4903                 goto out;
4904
4905         data->arg.label = label;
4906         status = nfs4_do_create(dir, dentry, data);
4907
4908         nfs4_free_createdata(data);
4909 out:
4910         return status;
4911 }
4912
4913 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4914                 struct iattr *sattr)
4915 {
4916         struct nfs_server *server = NFS_SERVER(dir);
4917         struct nfs4_exception exception = {
4918                 .interruptible = true,
4919         };
4920         struct nfs4_label l, *label = NULL;
4921         int err;
4922
4923         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4924
4925         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4926                 sattr->ia_mode &= ~current_umask();
4927         do {
4928                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4929                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4930                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4931                                 &exception);
4932         } while (exception.retry);
4933         nfs4_label_release_security(label);
4934
4935         return err;
4936 }
4937
4938 static int _nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred,
4939                 u64 cookie, struct page **pages, unsigned int count, bool plus)
4940 {
4941         struct inode            *dir = d_inode(dentry);
4942         struct nfs4_readdir_arg args = {
4943                 .fh = NFS_FH(dir),
4944                 .pages = pages,
4945                 .pgbase = 0,
4946                 .count = count,
4947                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4948                 .plus = plus,
4949         };
4950         struct nfs4_readdir_res res;
4951         struct rpc_message msg = {
4952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4953                 .rpc_argp = &args,
4954                 .rpc_resp = &res,
4955                 .rpc_cred = cred,
4956         };
4957         int                     status;
4958
4959         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4960                         dentry,
4961                         (unsigned long long)cookie);
4962         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4963         res.pgbase = args.pgbase;
4964         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4965         if (status >= 0) {
4966                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4967                 status += args.pgbase;
4968         }
4969
4970         nfs_invalidate_atime(dir);
4971
4972         dprintk("%s: returns %d\n", __func__, status);
4973         return status;
4974 }
4975
4976 static int nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred,
4977                 u64 cookie, struct page **pages, unsigned int count, bool plus)
4978 {
4979         struct nfs4_exception exception = {
4980                 .interruptible = true,
4981         };
4982         int err;
4983         do {
4984                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4985                                 pages, count, plus);
4986                 trace_nfs4_readdir(d_inode(dentry), err);
4987                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4988                                 &exception);
4989         } while (exception.retry);
4990         return err;
4991 }
4992
4993 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4994                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4995 {
4996         struct nfs4_createdata *data;
4997         int mode = sattr->ia_mode;
4998         int status = -ENOMEM;
4999
5000         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5001         if (data == NULL)
5002                 goto out;
5003
5004         if (S_ISFIFO(mode))
5005                 data->arg.ftype = NF4FIFO;
5006         else if (S_ISBLK(mode)) {
5007                 data->arg.ftype = NF4BLK;
5008                 data->arg.u.device.specdata1 = MAJOR(rdev);
5009                 data->arg.u.device.specdata2 = MINOR(rdev);
5010         }
5011         else if (S_ISCHR(mode)) {
5012                 data->arg.ftype = NF4CHR;
5013                 data->arg.u.device.specdata1 = MAJOR(rdev);
5014                 data->arg.u.device.specdata2 = MINOR(rdev);
5015         } else if (!S_ISSOCK(mode)) {
5016                 status = -EINVAL;
5017                 goto out_free;
5018         }
5019
5020         data->arg.label = label;
5021         status = nfs4_do_create(dir, dentry, data);
5022 out_free:
5023         nfs4_free_createdata(data);
5024 out:
5025         return status;
5026 }
5027
5028 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5029                 struct iattr *sattr, dev_t rdev)
5030 {
5031         struct nfs_server *server = NFS_SERVER(dir);
5032         struct nfs4_exception exception = {
5033                 .interruptible = true,
5034         };
5035         struct nfs4_label l, *label = NULL;
5036         int err;
5037
5038         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5039
5040         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5041                 sattr->ia_mode &= ~current_umask();
5042         do {
5043                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5044                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5045                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5046                                 &exception);
5047         } while (exception.retry);
5048
5049         nfs4_label_release_security(label);
5050
5051         return err;
5052 }
5053
5054 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5055                  struct nfs_fsstat *fsstat)
5056 {
5057         struct nfs4_statfs_arg args = {
5058                 .fh = fhandle,
5059                 .bitmask = server->attr_bitmask,
5060         };
5061         struct nfs4_statfs_res res = {
5062                 .fsstat = fsstat,
5063         };
5064         struct rpc_message msg = {
5065                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5066                 .rpc_argp = &args,
5067                 .rpc_resp = &res,
5068         };
5069
5070         nfs_fattr_init(fsstat->fattr);
5071         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5072 }
5073
5074 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5075 {
5076         struct nfs4_exception exception = {
5077                 .interruptible = true,
5078         };
5079         int err;
5080         do {
5081                 err = nfs4_handle_exception(server,
5082                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5083                                 &exception);
5084         } while (exception.retry);
5085         return err;
5086 }
5087
5088 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5089                 struct nfs_fsinfo *fsinfo)
5090 {
5091         struct nfs4_fsinfo_arg args = {
5092                 .fh = fhandle,
5093                 .bitmask = server->attr_bitmask,
5094         };
5095         struct nfs4_fsinfo_res res = {
5096                 .fsinfo = fsinfo,
5097         };
5098         struct rpc_message msg = {
5099                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5100                 .rpc_argp = &args,
5101                 .rpc_resp = &res,
5102         };
5103
5104         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5105 }
5106
5107 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5108 {
5109         struct nfs4_exception exception = {
5110                 .interruptible = true,
5111         };
5112         int err;
5113
5114         do {
5115                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5116                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5117                 if (err == 0) {
5118                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5119                         break;
5120                 }
5121                 err = nfs4_handle_exception(server, err, &exception);
5122         } while (exception.retry);
5123         return err;
5124 }
5125
5126 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5127 {
5128         int error;
5129
5130         nfs_fattr_init(fsinfo->fattr);
5131         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5132         if (error == 0) {
5133                 /* block layout checks this! */
5134                 server->pnfs_blksize = fsinfo->blksize;
5135                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5136         }
5137
5138         return error;
5139 }
5140
5141 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5142                 struct nfs_pathconf *pathconf)
5143 {
5144         struct nfs4_pathconf_arg args = {
5145                 .fh = fhandle,
5146                 .bitmask = server->attr_bitmask,
5147         };
5148         struct nfs4_pathconf_res res = {
5149                 .pathconf = pathconf,
5150         };
5151         struct rpc_message msg = {
5152                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5153                 .rpc_argp = &args,
5154                 .rpc_resp = &res,
5155         };
5156
5157         /* None of the pathconf attributes are mandatory to implement */
5158         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5159                 memset(pathconf, 0, sizeof(*pathconf));
5160                 return 0;
5161         }
5162
5163         nfs_fattr_init(pathconf->fattr);
5164         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5165 }
5166
5167 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5168                 struct nfs_pathconf *pathconf)
5169 {
5170         struct nfs4_exception exception = {
5171                 .interruptible = true,
5172         };
5173         int err;
5174
5175         do {
5176                 err = nfs4_handle_exception(server,
5177                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5178                                 &exception);
5179         } while (exception.retry);
5180         return err;
5181 }
5182
5183 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5184                 const struct nfs_open_context *ctx,
5185                 const struct nfs_lock_context *l_ctx,
5186                 fmode_t fmode)
5187 {
5188         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5189 }
5190 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5191
5192 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5193                 const struct nfs_open_context *ctx,
5194                 const struct nfs_lock_context *l_ctx,
5195                 fmode_t fmode)
5196 {
5197         nfs4_stateid _current_stateid;
5198
5199         /* If the current stateid represents a lost lock, then exit */
5200         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5201                 return true;
5202         return nfs4_stateid_match(stateid, &_current_stateid);
5203 }
5204
5205 static bool nfs4_error_stateid_expired(int err)
5206 {
5207         switch (err) {
5208         case -NFS4ERR_DELEG_REVOKED:
5209         case -NFS4ERR_ADMIN_REVOKED:
5210         case -NFS4ERR_BAD_STATEID:
5211         case -NFS4ERR_STALE_STATEID:
5212         case -NFS4ERR_OLD_STATEID:
5213         case -NFS4ERR_OPENMODE:
5214         case -NFS4ERR_EXPIRED:
5215                 return true;
5216         }
5217         return false;
5218 }
5219
5220 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5221 {
5222         struct nfs_server *server = NFS_SERVER(hdr->inode);
5223
5224         trace_nfs4_read(hdr, task->tk_status);
5225         if (task->tk_status < 0) {
5226                 struct nfs4_exception exception = {
5227                         .inode = hdr->inode,
5228                         .state = hdr->args.context->state,
5229                         .stateid = &hdr->args.stateid,
5230                 };
5231                 task->tk_status = nfs4_async_handle_exception(task,
5232                                 server, task->tk_status, &exception);
5233                 if (exception.retry) {
5234                         rpc_restart_call_prepare(task);
5235                         return -EAGAIN;
5236                 }
5237         }
5238
5239         if (task->tk_status > 0)
5240                 renew_lease(server, hdr->timestamp);
5241         return 0;
5242 }
5243
5244 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5245                 struct nfs_pgio_args *args)
5246 {
5247
5248         if (!nfs4_error_stateid_expired(task->tk_status) ||
5249                 nfs4_stateid_is_current(&args->stateid,
5250                                 args->context,
5251                                 args->lock_context,
5252                                 FMODE_READ))
5253                 return false;
5254         rpc_restart_call_prepare(task);
5255         return true;
5256 }
5257
5258 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5259 {
5260
5261         dprintk("--> %s\n", __func__);
5262
5263         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5264                 return -EAGAIN;
5265         if (nfs4_read_stateid_changed(task, &hdr->args))
5266                 return -EAGAIN;
5267         if (task->tk_status > 0)
5268                 nfs_invalidate_atime(hdr->inode);
5269         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5270                                     nfs4_read_done_cb(task, hdr);
5271 }
5272
5273 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5274                                  struct rpc_message *msg)
5275 {
5276         hdr->timestamp   = jiffies;
5277         if (!hdr->pgio_done_cb)
5278                 hdr->pgio_done_cb = nfs4_read_done_cb;
5279         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5280         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5281 }
5282
5283 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5284                                       struct nfs_pgio_header *hdr)
5285 {
5286         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5287                         &hdr->args.seq_args,
5288                         &hdr->res.seq_res,
5289                         task))
5290                 return 0;
5291         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5292                                 hdr->args.lock_context,
5293                                 hdr->rw_mode) == -EIO)
5294                 return -EIO;
5295         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5296                 return -EIO;
5297         return 0;
5298 }
5299
5300 static int nfs4_write_done_cb(struct rpc_task *task,
5301                               struct nfs_pgio_header *hdr)
5302 {
5303         struct inode *inode = hdr->inode;
5304
5305         trace_nfs4_write(hdr, task->tk_status);
5306         if (task->tk_status < 0) {
5307                 struct nfs4_exception exception = {
5308                         .inode = hdr->inode,
5309                         .state = hdr->args.context->state,
5310                         .stateid = &hdr->args.stateid,
5311                 };
5312                 task->tk_status = nfs4_async_handle_exception(task,
5313                                 NFS_SERVER(inode), task->tk_status,
5314                                 &exception);
5315                 if (exception.retry) {
5316                         rpc_restart_call_prepare(task);
5317                         return -EAGAIN;
5318                 }
5319         }
5320         if (task->tk_status >= 0) {
5321                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5322                 nfs_writeback_update_inode(hdr);
5323         }
5324         return 0;
5325 }
5326
5327 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5328                 struct nfs_pgio_args *args)
5329 {
5330
5331         if (!nfs4_error_stateid_expired(task->tk_status) ||
5332                 nfs4_stateid_is_current(&args->stateid,
5333                                 args->context,
5334                                 args->lock_context,
5335                                 FMODE_WRITE))
5336                 return false;
5337         rpc_restart_call_prepare(task);
5338         return true;
5339 }
5340
5341 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5342 {
5343         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5344                 return -EAGAIN;
5345         if (nfs4_write_stateid_changed(task, &hdr->args))
5346                 return -EAGAIN;
5347         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5348                 nfs4_write_done_cb(task, hdr);
5349 }
5350
5351 static
5352 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5353 {
5354         /* Don't request attributes for pNFS or O_DIRECT writes */
5355         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5356                 return false;
5357         /* Otherwise, request attributes if and only if we don't hold
5358          * a delegation
5359          */
5360         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5361 }
5362
5363 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5364                                   struct rpc_message *msg,
5365                                   struct rpc_clnt **clnt)
5366 {
5367         struct nfs_server *server = NFS_SERVER(hdr->inode);
5368
5369         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5370                 hdr->args.bitmask = NULL;
5371                 hdr->res.fattr = NULL;
5372         } else
5373                 hdr->args.bitmask = server->cache_consistency_bitmask;
5374
5375         if (!hdr->pgio_done_cb)
5376                 hdr->pgio_done_cb = nfs4_write_done_cb;
5377         hdr->res.server = server;
5378         hdr->timestamp   = jiffies;
5379
5380         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5381         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5382         nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5383 }
5384
5385 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5386 {
5387         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5388                         &data->args.seq_args,
5389                         &data->res.seq_res,
5390                         task);
5391 }
5392
5393 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5394 {
5395         struct inode *inode = data->inode;
5396
5397         trace_nfs4_commit(data, task->tk_status);
5398         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5399                                     NULL, NULL) == -EAGAIN) {
5400                 rpc_restart_call_prepare(task);
5401                 return -EAGAIN;
5402         }
5403         return 0;
5404 }
5405
5406 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5407 {
5408         if (!nfs4_sequence_done(task, &data->res.seq_res))
5409                 return -EAGAIN;
5410         return data->commit_done_cb(task, data);
5411 }
5412
5413 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5414                                    struct rpc_clnt **clnt)
5415 {
5416         struct nfs_server *server = NFS_SERVER(data->inode);
5417
5418         if (data->commit_done_cb == NULL)
5419                 data->commit_done_cb = nfs4_commit_done_cb;
5420         data->res.server = server;
5421         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5422         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5423         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5424 }
5425
5426 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5427                                 struct nfs_commitres *res)
5428 {
5429         struct inode *dst_inode = file_inode(dst);
5430         struct nfs_server *server = NFS_SERVER(dst_inode);
5431         struct rpc_message msg = {
5432                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5433                 .rpc_argp = args,
5434                 .rpc_resp = res,
5435         };
5436
5437         args->fh = NFS_FH(dst_inode);
5438         return nfs4_call_sync(server->client, server, &msg,
5439                         &args->seq_args, &res->seq_res, 1);
5440 }
5441
5442 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5443 {
5444         struct nfs_commitargs args = {
5445                 .offset = offset,
5446                 .count = count,
5447         };
5448         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5449         struct nfs4_exception exception = { };
5450         int status;
5451
5452         do {
5453                 status = _nfs4_proc_commit(dst, &args, res);
5454                 status = nfs4_handle_exception(dst_server, status, &exception);
5455         } while (exception.retry);
5456
5457         return status;
5458 }
5459
5460 struct nfs4_renewdata {
5461         struct nfs_client       *client;
5462         unsigned long           timestamp;
5463 };
5464
5465 /*
5466  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5467  * standalone procedure for queueing an asynchronous RENEW.
5468  */
5469 static void nfs4_renew_release(void *calldata)
5470 {
5471         struct nfs4_renewdata *data = calldata;
5472         struct nfs_client *clp = data->client;
5473
5474         if (refcount_read(&clp->cl_count) > 1)
5475                 nfs4_schedule_state_renewal(clp);
5476         nfs_put_client(clp);
5477         kfree(data);
5478 }
5479
5480 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5481 {
5482         struct nfs4_renewdata *data = calldata;
5483         struct nfs_client *clp = data->client;
5484         unsigned long timestamp = data->timestamp;
5485
5486         trace_nfs4_renew_async(clp, task->tk_status);
5487         switch (task->tk_status) {
5488         case 0:
5489                 break;
5490         case -NFS4ERR_LEASE_MOVED:
5491                 nfs4_schedule_lease_moved_recovery(clp);
5492                 break;
5493         default:
5494                 /* Unless we're shutting down, schedule state recovery! */
5495                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5496                         return;
5497                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5498                         nfs4_schedule_lease_recovery(clp);
5499                         return;
5500                 }
5501                 nfs4_schedule_path_down_recovery(clp);
5502         }
5503         do_renew_lease(clp, timestamp);
5504 }
5505
5506 static const struct rpc_call_ops nfs4_renew_ops = {
5507         .rpc_call_done = nfs4_renew_done,
5508         .rpc_release = nfs4_renew_release,
5509 };
5510
5511 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5512 {
5513         struct rpc_message msg = {
5514                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5515                 .rpc_argp       = clp,
5516                 .rpc_cred       = cred,
5517         };
5518         struct nfs4_renewdata *data;
5519
5520         if (renew_flags == 0)
5521                 return 0;
5522         if (!refcount_inc_not_zero(&clp->cl_count))
5523                 return -EIO;
5524         data = kmalloc(sizeof(*data), GFP_NOFS);
5525         if (data == NULL) {
5526                 nfs_put_client(clp);
5527                 return -ENOMEM;
5528         }
5529         data->client = clp;
5530         data->timestamp = jiffies;
5531         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5532                         &nfs4_renew_ops, data);
5533 }
5534
5535 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5536 {
5537         struct rpc_message msg = {
5538                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5539                 .rpc_argp       = clp,
5540                 .rpc_cred       = cred,
5541         };
5542         unsigned long now = jiffies;
5543         int status;
5544
5545         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5546         if (status < 0)
5547                 return status;
5548         do_renew_lease(clp, now);
5549         return 0;
5550 }
5551
5552 static inline int nfs4_server_supports_acls(struct nfs_server *server)
5553 {
5554         return server->caps & NFS_CAP_ACLS;
5555 }
5556
5557 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5558  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5559  * the stack.
5560  */
5561 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5562
5563 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5564                 struct page **pages)
5565 {
5566         struct page *newpage, **spages;
5567         int rc = 0;
5568         size_t len;
5569         spages = pages;
5570
5571         do {
5572                 len = min_t(size_t, PAGE_SIZE, buflen);
5573                 newpage = alloc_page(GFP_KERNEL);
5574
5575                 if (newpage == NULL)
5576                         goto unwind;
5577                 memcpy(page_address(newpage), buf, len);
5578                 buf += len;
5579                 buflen -= len;
5580                 *pages++ = newpage;
5581                 rc++;
5582         } while (buflen != 0);
5583
5584         return rc;
5585
5586 unwind:
5587         for(; rc > 0; rc--)
5588                 __free_page(spages[rc-1]);
5589         return -ENOMEM;
5590 }
5591
5592 struct nfs4_cached_acl {
5593         int cached;
5594         size_t len;
5595         char data[];
5596 };
5597
5598 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5599 {
5600         struct nfs_inode *nfsi = NFS_I(inode);
5601
5602         spin_lock(&inode->i_lock);
5603         kfree(nfsi->nfs4_acl);
5604         nfsi->nfs4_acl = acl;
5605         spin_unlock(&inode->i_lock);
5606 }
5607
5608 static void nfs4_zap_acl_attr(struct inode *inode)
5609 {
5610         nfs4_set_cached_acl(inode, NULL);
5611 }
5612
5613 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
5614 {
5615         struct nfs_inode *nfsi = NFS_I(inode);
5616         struct nfs4_cached_acl *acl;
5617         int ret = -ENOENT;
5618
5619         spin_lock(&inode->i_lock);
5620         acl = nfsi->nfs4_acl;
5621         if (acl == NULL)
5622                 goto out;
5623         if (buf == NULL) /* user is just asking for length */
5624                 goto out_len;
5625         if (acl->cached == 0)
5626                 goto out;
5627         ret = -ERANGE; /* see getxattr(2) man page */
5628         if (acl->len > buflen)
5629                 goto out;
5630         memcpy(buf, acl->data, acl->len);
5631 out_len:
5632         ret = acl->len;
5633 out:
5634         spin_unlock(&inode->i_lock);
5635         return ret;
5636 }
5637
5638 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
5639 {
5640         struct nfs4_cached_acl *acl;
5641         size_t buflen = sizeof(*acl) + acl_len;
5642
5643         if (buflen <= PAGE_SIZE) {
5644                 acl = kmalloc(buflen, GFP_KERNEL);
5645                 if (acl == NULL)
5646                         goto out;
5647                 acl->cached = 1;
5648                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5649         } else {
5650                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5651                 if (acl == NULL)
5652                         goto out;
5653                 acl->cached = 0;
5654         }
5655         acl->len = acl_len;
5656 out:
5657         nfs4_set_cached_acl(inode, acl);
5658 }
5659
5660 /*
5661  * The getxattr API returns the required buffer length when called with a
5662  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5663  * the required buf.  On a NULL buf, we send a page of data to the server
5664  * guessing that the ACL request can be serviced by a page. If so, we cache
5665  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5666  * the cache. If not so, we throw away the page, and cache the required
5667  * length. The next getxattr call will then produce another round trip to
5668  * the server, this time with the input buf of the required size.
5669  */
5670 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5671 {
5672         struct page **pages;
5673         struct nfs_getaclargs args = {
5674                 .fh = NFS_FH(inode),
5675                 .acl_len = buflen,
5676         };
5677         struct nfs_getaclres res = {
5678                 .acl_len = buflen,
5679         };
5680         struct rpc_message msg = {
5681                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5682                 .rpc_argp = &args,
5683                 .rpc_resp = &res,
5684         };
5685         unsigned int npages;
5686         int ret = -ENOMEM, i;
5687         struct nfs_server *server = NFS_SERVER(inode);
5688
5689         if (buflen == 0)
5690                 buflen = server->rsize;
5691
5692         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5693         pages = kmalloc_array(npages, sizeof(struct page *), GFP_NOFS);
5694         if (!pages)
5695                 return -ENOMEM;
5696
5697         args.acl_pages = pages;
5698
5699         for (i = 0; i < npages; i++) {
5700                 pages[i] = alloc_page(GFP_KERNEL);
5701                 if (!pages[i])
5702                         goto out_free;
5703         }
5704
5705         /* for decoding across pages */
5706         res.acl_scratch = alloc_page(GFP_KERNEL);
5707         if (!res.acl_scratch)
5708                 goto out_free;
5709
5710         args.acl_len = npages * PAGE_SIZE;
5711
5712         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5713                 __func__, buf, buflen, npages, args.acl_len);
5714         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5715                              &msg, &args.seq_args, &res.seq_res, 0);
5716         if (ret)
5717                 goto out_free;
5718
5719         /* Handle the case where the passed-in buffer is too short */
5720         if (res.acl_flags & NFS4_ACL_TRUNC) {
5721                 /* Did the user only issue a request for the acl length? */
5722                 if (buf == NULL)
5723                         goto out_ok;
5724                 ret = -ERANGE;
5725                 goto out_free;
5726         }
5727         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5728         if (buf) {
5729                 if (res.acl_len > buflen) {
5730                         ret = -ERANGE;
5731                         goto out_free;
5732                 }
5733                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5734         }
5735 out_ok:
5736         ret = res.acl_len;
5737 out_free:
5738         for (i = 0; i < npages; i++)
5739                 if (pages[i])
5740                         __free_page(pages[i]);
5741         if (res.acl_scratch)
5742                 __free_page(res.acl_scratch);
5743         kfree(pages);
5744         return ret;
5745 }
5746
5747 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5748 {
5749         struct nfs4_exception exception = {
5750                 .interruptible = true,
5751         };
5752         ssize_t ret;
5753         do {
5754                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5755                 trace_nfs4_get_acl(inode, ret);
5756                 if (ret >= 0)
5757                         break;
5758                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5759         } while (exception.retry);
5760         return ret;
5761 }
5762
5763 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5764 {
5765         struct nfs_server *server = NFS_SERVER(inode);
5766         int ret;
5767
5768         if (!nfs4_server_supports_acls(server))
5769                 return -EOPNOTSUPP;
5770         ret = nfs_revalidate_inode(server, inode);
5771         if (ret < 0)
5772                 return ret;
5773         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5774                 nfs_zap_acl_cache(inode);
5775         ret = nfs4_read_cached_acl(inode, buf, buflen);
5776         if (ret != -ENOENT)
5777                 /* -ENOENT is returned if there is no ACL or if there is an ACL
5778                  * but no cached acl data, just the acl length */
5779                 return ret;
5780         return nfs4_get_acl_uncached(inode, buf, buflen);
5781 }
5782
5783 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5784 {
5785         struct nfs_server *server = NFS_SERVER(inode);
5786         struct page *pages[NFS4ACL_MAXPAGES];
5787         struct nfs_setaclargs arg = {
5788                 .fh             = NFS_FH(inode),
5789                 .acl_pages      = pages,
5790                 .acl_len        = buflen,
5791         };
5792         struct nfs_setaclres res;
5793         struct rpc_message msg = {
5794                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5795                 .rpc_argp       = &arg,
5796                 .rpc_resp       = &res,
5797         };
5798         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5799         int ret, i;
5800
5801         if (!nfs4_server_supports_acls(server))
5802                 return -EOPNOTSUPP;
5803         if (npages > ARRAY_SIZE(pages))
5804                 return -ERANGE;
5805         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5806         if (i < 0)
5807                 return i;
5808         nfs4_inode_make_writeable(inode);
5809         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5810
5811         /*
5812          * Free each page after tx, so the only ref left is
5813          * held by the network stack
5814          */
5815         for (; i > 0; i--)
5816                 put_page(pages[i-1]);
5817
5818         /*
5819          * Acl update can result in inode attribute update.
5820          * so mark the attribute cache invalid.
5821          */
5822         spin_lock(&inode->i_lock);
5823         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE
5824                 | NFS_INO_INVALID_CTIME
5825                 | NFS_INO_REVAL_FORCED;
5826         spin_unlock(&inode->i_lock);
5827         nfs_access_zap_cache(inode);
5828         nfs_zap_acl_cache(inode);
5829         return ret;
5830 }
5831
5832 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5833 {
5834         struct nfs4_exception exception = { };
5835         int err;
5836         do {
5837                 err = __nfs4_proc_set_acl(inode, buf, buflen);
5838                 trace_nfs4_set_acl(inode, err);
5839                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5840                                 &exception);
5841         } while (exception.retry);
5842         return err;
5843 }
5844
5845 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5846 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5847                                         size_t buflen)
5848 {
5849         struct nfs_server *server = NFS_SERVER(inode);
5850         struct nfs_fattr fattr;
5851         struct nfs4_label label = {0, 0, buflen, buf};
5852
5853         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5854         struct nfs4_getattr_arg arg = {
5855                 .fh             = NFS_FH(inode),
5856                 .bitmask        = bitmask,
5857         };
5858         struct nfs4_getattr_res res = {
5859                 .fattr          = &fattr,
5860                 .label          = &label,
5861                 .server         = server,
5862         };
5863         struct rpc_message msg = {
5864                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5865                 .rpc_argp       = &arg,
5866                 .rpc_resp       = &res,
5867         };
5868         int ret;
5869
5870         nfs_fattr_init(&fattr);
5871
5872         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5873         if (ret)
5874                 return ret;
5875         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5876                 return -ENOENT;
5877         return 0;
5878 }
5879
5880 static int nfs4_get_security_label(struct inode *inode, void *buf,
5881                                         size_t buflen)
5882 {
5883         struct nfs4_exception exception = {
5884                 .interruptible = true,
5885         };
5886         int err;
5887
5888         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5889                 return -EOPNOTSUPP;
5890
5891         do {
5892                 err = _nfs4_get_security_label(inode, buf, buflen);
5893                 trace_nfs4_get_security_label(inode, err);
5894                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5895                                 &exception);
5896         } while (exception.retry);
5897         return err;
5898 }
5899
5900 static int _nfs4_do_set_security_label(struct inode *inode,
5901                 struct nfs4_label *ilabel,
5902                 struct nfs_fattr *fattr,
5903                 struct nfs4_label *olabel)
5904 {
5905
5906         struct iattr sattr = {0};
5907         struct nfs_server *server = NFS_SERVER(inode);
5908         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5909         struct nfs_setattrargs arg = {
5910                 .fh             = NFS_FH(inode),
5911                 .iap            = &sattr,
5912                 .server         = server,
5913                 .bitmask        = bitmask,
5914                 .label          = ilabel,
5915         };
5916         struct nfs_setattrres res = {
5917                 .fattr          = fattr,
5918                 .label          = olabel,
5919                 .server         = server,
5920         };
5921         struct rpc_message msg = {
5922                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5923                 .rpc_argp       = &arg,
5924                 .rpc_resp       = &res,
5925         };
5926         int status;
5927
5928         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5929
5930         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5931         if (status)
5932                 dprintk("%s failed: %d\n", __func__, status);
5933
5934         return status;
5935 }
5936
5937 static int nfs4_do_set_security_label(struct inode *inode,
5938                 struct nfs4_label *ilabel,
5939                 struct nfs_fattr *fattr,
5940                 struct nfs4_label *olabel)
5941 {
5942         struct nfs4_exception exception = { };
5943         int err;
5944
5945         do {
5946                 err = _nfs4_do_set_security_label(inode, ilabel,
5947                                 fattr, olabel);
5948                 trace_nfs4_set_security_label(inode, err);
5949                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5950                                 &exception);
5951         } while (exception.retry);
5952         return err;
5953 }
5954
5955 static int
5956 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5957 {
5958         struct nfs4_label ilabel, *olabel = NULL;
5959         struct nfs_fattr fattr;
5960         int status;
5961
5962         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5963                 return -EOPNOTSUPP;
5964
5965         nfs_fattr_init(&fattr);
5966
5967         ilabel.pi = 0;
5968         ilabel.lfs = 0;
5969         ilabel.label = (char *)buf;
5970         ilabel.len = buflen;
5971
5972         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5973         if (IS_ERR(olabel)) {
5974                 status = -PTR_ERR(olabel);
5975                 goto out;
5976         }
5977
5978         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5979         if (status == 0)
5980                 nfs_setsecurity(inode, &fattr, olabel);
5981
5982         nfs4_label_free(olabel);
5983 out:
5984         return status;
5985 }
5986 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5987
5988
5989 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5990                                     nfs4_verifier *bootverf)
5991 {
5992         __be32 verf[2];
5993
5994         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5995                 /* An impossible timestamp guarantees this value
5996                  * will never match a generated boot time. */
5997                 verf[0] = cpu_to_be32(U32_MAX);
5998                 verf[1] = cpu_to_be32(U32_MAX);
5999         } else {
6000                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6001                 u64 ns = ktime_to_ns(nn->boot_time);
6002
6003                 verf[0] = cpu_to_be32(ns >> 32);
6004                 verf[1] = cpu_to_be32(ns);
6005         }
6006         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6007 }
6008
6009 static int
6010 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6011 {
6012         size_t len;
6013         char *str;
6014
6015         if (clp->cl_owner_id != NULL)
6016                 return 0;
6017
6018         rcu_read_lock();
6019         len = 14 +
6020                 strlen(clp->cl_rpcclient->cl_nodename) +
6021                 1 +
6022                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6023                 1;
6024         rcu_read_unlock();
6025         if (nfs4_client_id_uniquifier[0] != '\0')
6026                 len += strlen(nfs4_client_id_uniquifier) + 1;
6027         if (len > NFS4_OPAQUE_LIMIT + 1)
6028                 return -EINVAL;
6029
6030         /*
6031          * Since this string is allocated at mount time, and held until the
6032          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6033          * about a memory-reclaim deadlock.
6034          */
6035         str = kmalloc(len, GFP_KERNEL);
6036         if (!str)
6037                 return -ENOMEM;
6038
6039         rcu_read_lock();
6040         if (nfs4_client_id_uniquifier[0] != '\0')
6041                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6042                           clp->cl_rpcclient->cl_nodename,
6043                           nfs4_client_id_uniquifier,
6044                           rpc_peeraddr2str(clp->cl_rpcclient,
6045                                            RPC_DISPLAY_ADDR));
6046         else
6047                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6048                           clp->cl_rpcclient->cl_nodename,
6049                           rpc_peeraddr2str(clp->cl_rpcclient,
6050                                            RPC_DISPLAY_ADDR));
6051         rcu_read_unlock();
6052
6053         clp->cl_owner_id = str;
6054         return 0;
6055 }
6056
6057 static int
6058 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
6059 {
6060         size_t len;
6061         char *str;
6062
6063         len = 10 + 10 + 1 + 10 + 1 +
6064                 strlen(nfs4_client_id_uniquifier) + 1 +
6065                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6066
6067         if (len > NFS4_OPAQUE_LIMIT + 1)
6068                 return -EINVAL;
6069
6070         /*
6071          * Since this string is allocated at mount time, and held until the
6072          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6073          * about a memory-reclaim deadlock.
6074          */
6075         str = kmalloc(len, GFP_KERNEL);
6076         if (!str)
6077                 return -ENOMEM;
6078
6079         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6080                         clp->rpc_ops->version, clp->cl_minorversion,
6081                         nfs4_client_id_uniquifier,
6082                         clp->cl_rpcclient->cl_nodename);
6083         clp->cl_owner_id = str;
6084         return 0;
6085 }
6086
6087 static int
6088 nfs4_init_uniform_client_string(struct nfs_client *clp)
6089 {
6090         size_t len;
6091         char *str;
6092
6093         if (clp->cl_owner_id != NULL)
6094                 return 0;
6095
6096         if (nfs4_client_id_uniquifier[0] != '\0')
6097                 return nfs4_init_uniquifier_client_string(clp);
6098
6099         len = 10 + 10 + 1 + 10 + 1 +
6100                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6101
6102         if (len > NFS4_OPAQUE_LIMIT + 1)
6103                 return -EINVAL;
6104
6105         /*
6106          * Since this string is allocated at mount time, and held until the
6107          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6108          * about a memory-reclaim deadlock.
6109          */
6110         str = kmalloc(len, GFP_KERNEL);
6111         if (!str)
6112                 return -ENOMEM;
6113
6114         scnprintf(str, len, "Linux NFSv%u.%u %s",
6115                         clp->rpc_ops->version, clp->cl_minorversion,
6116                         clp->cl_rpcclient->cl_nodename);
6117         clp->cl_owner_id = str;
6118         return 0;
6119 }
6120
6121 /*
6122  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6123  * services.  Advertise one based on the address family of the
6124  * clientaddr.
6125  */
6126 static unsigned int
6127 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6128 {
6129         if (strchr(clp->cl_ipaddr, ':') != NULL)
6130                 return scnprintf(buf, len, "tcp6");
6131         else
6132                 return scnprintf(buf, len, "tcp");
6133 }
6134
6135 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6136 {
6137         struct nfs4_setclientid *sc = calldata;
6138
6139         if (task->tk_status == 0)
6140                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6141 }
6142
6143 static const struct rpc_call_ops nfs4_setclientid_ops = {
6144         .rpc_call_done = nfs4_setclientid_done,
6145 };
6146
6147 /**
6148  * nfs4_proc_setclientid - Negotiate client ID
6149  * @clp: state data structure
6150  * @program: RPC program for NFSv4 callback service
6151  * @port: IP port number for NFS4 callback service
6152  * @cred: credential to use for this call
6153  * @res: where to place the result
6154  *
6155  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6156  */
6157 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6158                 unsigned short port, const struct cred *cred,
6159                 struct nfs4_setclientid_res *res)
6160 {
6161         nfs4_verifier sc_verifier;
6162         struct nfs4_setclientid setclientid = {
6163                 .sc_verifier = &sc_verifier,
6164                 .sc_prog = program,
6165                 .sc_clnt = clp,
6166         };
6167         struct rpc_message msg = {
6168                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6169                 .rpc_argp = &setclientid,
6170                 .rpc_resp = res,
6171                 .rpc_cred = cred,
6172         };
6173         struct rpc_task_setup task_setup_data = {
6174                 .rpc_client = clp->cl_rpcclient,
6175                 .rpc_message = &msg,
6176                 .callback_ops = &nfs4_setclientid_ops,
6177                 .callback_data = &setclientid,
6178                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6179         };
6180         unsigned long now = jiffies;
6181         int status;
6182
6183         /* nfs_client_id4 */
6184         nfs4_init_boot_verifier(clp, &sc_verifier);
6185
6186         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6187                 status = nfs4_init_uniform_client_string(clp);
6188         else
6189                 status = nfs4_init_nonuniform_client_string(clp);
6190
6191         if (status)
6192                 goto out;
6193
6194         /* cb_client4 */
6195         setclientid.sc_netid_len =
6196                                 nfs4_init_callback_netid(clp,
6197                                                 setclientid.sc_netid,
6198                                                 sizeof(setclientid.sc_netid));
6199         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6200                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6201                                 clp->cl_ipaddr, port >> 8, port & 255);
6202
6203         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6204                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6205                 clp->cl_owner_id);
6206
6207         status = nfs4_call_sync_custom(&task_setup_data);
6208         if (setclientid.sc_cred) {
6209                 kfree(clp->cl_acceptor);
6210                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6211                 put_rpccred(setclientid.sc_cred);
6212         }
6213
6214         if (status == 0)
6215                 do_renew_lease(clp, now);
6216 out:
6217         trace_nfs4_setclientid(clp, status);
6218         dprintk("NFS reply setclientid: %d\n", status);
6219         return status;
6220 }
6221
6222 /**
6223  * nfs4_proc_setclientid_confirm - Confirm client ID
6224  * @clp: state data structure
6225  * @arg: result of a previous SETCLIENTID
6226  * @cred: credential to use for this call
6227  *
6228  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6229  */
6230 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6231                 struct nfs4_setclientid_res *arg,
6232                 const struct cred *cred)
6233 {
6234         struct rpc_message msg = {
6235                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6236                 .rpc_argp = arg,
6237                 .rpc_cred = cred,
6238         };
6239         int status;
6240
6241         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6242                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6243                 clp->cl_clientid);
6244         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6245                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6246         trace_nfs4_setclientid_confirm(clp, status);
6247         dprintk("NFS reply setclientid_confirm: %d\n", status);
6248         return status;
6249 }
6250
6251 struct nfs4_delegreturndata {
6252         struct nfs4_delegreturnargs args;
6253         struct nfs4_delegreturnres res;
6254         struct nfs_fh fh;
6255         nfs4_stateid stateid;
6256         unsigned long timestamp;
6257         struct {
6258                 struct nfs4_layoutreturn_args arg;
6259                 struct nfs4_layoutreturn_res res;
6260                 struct nfs4_xdr_opaque_data ld_private;
6261                 u32 roc_barrier;
6262                 bool roc;
6263         } lr;
6264         struct nfs_fattr fattr;
6265         int rpc_status;
6266         struct inode *inode;
6267 };
6268
6269 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6270 {
6271         struct nfs4_delegreturndata *data = calldata;
6272         struct nfs4_exception exception = {
6273                 .inode = data->inode,
6274                 .stateid = &data->stateid,
6275         };
6276
6277         if (!nfs4_sequence_done(task, &data->res.seq_res))
6278                 return;
6279
6280         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6281
6282         /* Handle Layoutreturn errors */
6283         if (pnfs_roc_done(task, data->inode,
6284                                 &data->args.lr_args,
6285                                 &data->res.lr_res,
6286                                 &data->res.lr_ret) == -EAGAIN)
6287                 goto out_restart;
6288
6289         switch (task->tk_status) {
6290         case 0:
6291                 renew_lease(data->res.server, data->timestamp);
6292                 break;
6293         case -NFS4ERR_ADMIN_REVOKED:
6294         case -NFS4ERR_DELEG_REVOKED:
6295         case -NFS4ERR_EXPIRED:
6296                 nfs4_free_revoked_stateid(data->res.server,
6297                                 data->args.stateid,
6298                                 task->tk_msg.rpc_cred);
6299                 fallthrough;
6300         case -NFS4ERR_BAD_STATEID:
6301         case -NFS4ERR_STALE_STATEID:
6302         case -ETIMEDOUT:
6303                 task->tk_status = 0;
6304                 break;
6305         case -NFS4ERR_OLD_STATEID:
6306                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6307                         nfs4_stateid_seqid_inc(&data->stateid);
6308                 if (data->args.bitmask) {
6309                         data->args.bitmask = NULL;
6310                         data->res.fattr = NULL;
6311                 }
6312                 goto out_restart;
6313         case -NFS4ERR_ACCESS:
6314                 if (data->args.bitmask) {
6315                         data->args.bitmask = NULL;
6316                         data->res.fattr = NULL;
6317                         goto out_restart;
6318                 }
6319                 fallthrough;
6320         default:
6321                 task->tk_status = nfs4_async_handle_exception(task,
6322                                 data->res.server, task->tk_status,
6323                                 &exception);
6324                 if (exception.retry)
6325                         goto out_restart;
6326         }
6327         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6328         data->rpc_status = task->tk_status;
6329         return;
6330 out_restart:
6331         task->tk_status = 0;
6332         rpc_restart_call_prepare(task);
6333 }
6334
6335 static void nfs4_delegreturn_release(void *calldata)
6336 {
6337         struct nfs4_delegreturndata *data = calldata;
6338         struct inode *inode = data->inode;
6339
6340         if (inode) {
6341                 if (data->lr.roc)
6342                         pnfs_roc_release(&data->lr.arg, &data->lr.res,
6343                                         data->res.lr_ret);
6344                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
6345                 nfs_iput_and_deactive(inode);
6346         }
6347         kfree(calldata);
6348 }
6349
6350 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6351 {
6352         struct nfs4_delegreturndata *d_data;
6353         struct pnfs_layout_hdr *lo;
6354
6355         d_data = (struct nfs4_delegreturndata *)data;
6356
6357         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6358                 nfs4_sequence_done(task, &d_data->res.seq_res);
6359                 return;
6360         }
6361
6362         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6363         if (lo && !pnfs_layout_is_valid(lo)) {
6364                 d_data->args.lr_args = NULL;
6365                 d_data->res.lr_res = NULL;
6366         }
6367
6368         nfs4_setup_sequence(d_data->res.server->nfs_client,
6369                         &d_data->args.seq_args,
6370                         &d_data->res.seq_res,
6371                         task);
6372 }
6373
6374 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6375         .rpc_call_prepare = nfs4_delegreturn_prepare,
6376         .rpc_call_done = nfs4_delegreturn_done,
6377         .rpc_release = nfs4_delegreturn_release,
6378 };
6379
6380 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6381 {
6382         struct nfs4_delegreturndata *data;
6383         struct nfs_server *server = NFS_SERVER(inode);
6384         struct rpc_task *task;
6385         struct rpc_message msg = {
6386                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6387                 .rpc_cred = cred,
6388         };
6389         struct rpc_task_setup task_setup_data = {
6390                 .rpc_client = server->client,
6391                 .rpc_message = &msg,
6392                 .callback_ops = &nfs4_delegreturn_ops,
6393                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6394         };
6395         int status = 0;
6396
6397         data = kzalloc(sizeof(*data), GFP_NOFS);
6398         if (data == NULL)
6399                 return -ENOMEM;
6400         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
6401
6402         nfs4_state_protect(server->nfs_client,
6403                         NFS_SP4_MACH_CRED_CLEANUP,
6404                         &task_setup_data.rpc_client, &msg);
6405
6406         data->args.fhandle = &data->fh;
6407         data->args.stateid = &data->stateid;
6408         data->args.bitmask = server->cache_consistency_bitmask;
6409         nfs_copy_fh(&data->fh, NFS_FH(inode));
6410         nfs4_stateid_copy(&data->stateid, stateid);
6411         data->res.fattr = &data->fattr;
6412         data->res.server = server;
6413         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6414         data->lr.arg.ld_private = &data->lr.ld_private;
6415         nfs_fattr_init(data->res.fattr);
6416         data->timestamp = jiffies;
6417         data->rpc_status = 0;
6418         data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred);
6419         data->inode = nfs_igrab_and_active(inode);
6420         if (data->inode) {
6421                 if (data->lr.roc) {
6422                         data->args.lr_args = &data->lr.arg;
6423                         data->res.lr_res = &data->lr.res;
6424                 }
6425         } else if (data->lr.roc) {
6426                 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0);
6427                 data->lr.roc = false;
6428         }
6429
6430         task_setup_data.callback_data = data;
6431         msg.rpc_argp = &data->args;
6432         msg.rpc_resp = &data->res;
6433         task = rpc_run_task(&task_setup_data);
6434         if (IS_ERR(task))
6435                 return PTR_ERR(task);
6436         if (!issync)
6437                 goto out;
6438         status = rpc_wait_for_completion_task(task);
6439         if (status != 0)
6440                 goto out;
6441         status = data->rpc_status;
6442 out:
6443         rpc_put_task(task);
6444         return status;
6445 }
6446
6447 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6448 {
6449         struct nfs_server *server = NFS_SERVER(inode);
6450         struct nfs4_exception exception = { };
6451         int err;
6452         do {
6453                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6454                 trace_nfs4_delegreturn(inode, stateid, err);
6455                 switch (err) {
6456                         case -NFS4ERR_STALE_STATEID:
6457                         case -NFS4ERR_EXPIRED:
6458                         case 0:
6459                                 return 0;
6460                 }
6461                 err = nfs4_handle_exception(server, err, &exception);
6462         } while (exception.retry);
6463         return err;
6464 }
6465
6466 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6467 {
6468         struct inode *inode = state->inode;
6469         struct nfs_server *server = NFS_SERVER(inode);
6470         struct nfs_client *clp = server->nfs_client;
6471         struct nfs_lockt_args arg = {
6472                 .fh = NFS_FH(inode),
6473                 .fl = request,
6474         };
6475         struct nfs_lockt_res res = {
6476                 .denied = request,
6477         };
6478         struct rpc_message msg = {
6479                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6480                 .rpc_argp       = &arg,
6481                 .rpc_resp       = &res,
6482                 .rpc_cred       = state->owner->so_cred,
6483         };
6484         struct nfs4_lock_state *lsp;
6485         int status;
6486
6487         arg.lock_owner.clientid = clp->cl_clientid;
6488         status = nfs4_set_lock_state(state, request);
6489         if (status != 0)
6490                 goto out;
6491         lsp = request->fl_u.nfs4_fl.owner;
6492         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6493         arg.lock_owner.s_dev = server->s_dev;
6494         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6495         switch (status) {
6496                 case 0:
6497                         request->fl_type = F_UNLCK;
6498                         break;
6499                 case -NFS4ERR_DENIED:
6500                         status = 0;
6501         }
6502         request->fl_ops->fl_release_private(request);
6503         request->fl_ops = NULL;
6504 out:
6505         return status;
6506 }
6507
6508 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6509 {
6510         struct nfs4_exception exception = {
6511                 .interruptible = true,
6512         };
6513         int err;
6514
6515         do {
6516                 err = _nfs4_proc_getlk(state, cmd, request);
6517                 trace_nfs4_get_lock(request, state, cmd, err);
6518                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6519                                 &exception);
6520         } while (exception.retry);
6521         return err;
6522 }
6523
6524 /*
6525  * Update the seqid of a lock stateid after receiving
6526  * NFS4ERR_OLD_STATEID
6527  */
6528 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6529                 struct nfs4_lock_state *lsp)
6530 {
6531         struct nfs4_state *state = lsp->ls_state;
6532         bool ret = false;
6533
6534         spin_lock(&state->state_lock);
6535         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6536                 goto out;
6537         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6538                 nfs4_stateid_seqid_inc(dst);
6539         else
6540                 dst->seqid = lsp->ls_stateid.seqid;
6541         ret = true;
6542 out:
6543         spin_unlock(&state->state_lock);
6544         return ret;
6545 }
6546
6547 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6548                 struct nfs4_lock_state *lsp)
6549 {
6550         struct nfs4_state *state = lsp->ls_state;
6551         bool ret;
6552
6553         spin_lock(&state->state_lock);
6554         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6555         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6556         spin_unlock(&state->state_lock);
6557         return ret;
6558 }
6559
6560 struct nfs4_unlockdata {
6561         struct nfs_locku_args arg;
6562         struct nfs_locku_res res;
6563         struct nfs4_lock_state *lsp;
6564         struct nfs_open_context *ctx;
6565         struct nfs_lock_context *l_ctx;
6566         struct file_lock fl;
6567         struct nfs_server *server;
6568         unsigned long timestamp;
6569 };
6570
6571 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6572                 struct nfs_open_context *ctx,
6573                 struct nfs4_lock_state *lsp,
6574                 struct nfs_seqid *seqid)
6575 {
6576         struct nfs4_unlockdata *p;
6577         struct nfs4_state *state = lsp->ls_state;
6578         struct inode *inode = state->inode;
6579
6580         p = kzalloc(sizeof(*p), GFP_NOFS);
6581         if (p == NULL)
6582                 return NULL;
6583         p->arg.fh = NFS_FH(inode);
6584         p->arg.fl = &p->fl;
6585         p->arg.seqid = seqid;
6586         p->res.seqid = seqid;
6587         p->lsp = lsp;
6588         /* Ensure we don't close file until we're done freeing locks! */
6589         p->ctx = get_nfs_open_context(ctx);
6590         p->l_ctx = nfs_get_lock_context(ctx);
6591         locks_init_lock(&p->fl);
6592         locks_copy_lock(&p->fl, fl);
6593         p->server = NFS_SERVER(inode);
6594         spin_lock(&state->state_lock);
6595         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6596         spin_unlock(&state->state_lock);
6597         return p;
6598 }
6599
6600 static void nfs4_locku_release_calldata(void *data)
6601 {
6602         struct nfs4_unlockdata *calldata = data;
6603         nfs_free_seqid(calldata->arg.seqid);
6604         nfs4_put_lock_state(calldata->lsp);
6605         nfs_put_lock_context(calldata->l_ctx);
6606         put_nfs_open_context(calldata->ctx);
6607         kfree(calldata);
6608 }
6609
6610 static void nfs4_locku_done(struct rpc_task *task, void *data)
6611 {
6612         struct nfs4_unlockdata *calldata = data;
6613         struct nfs4_exception exception = {
6614                 .inode = calldata->lsp->ls_state->inode,
6615                 .stateid = &calldata->arg.stateid,
6616         };
6617
6618         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6619                 return;
6620         switch (task->tk_status) {
6621                 case 0:
6622                         renew_lease(calldata->server, calldata->timestamp);
6623                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6624                         if (nfs4_update_lock_stateid(calldata->lsp,
6625                                         &calldata->res.stateid))
6626                                 break;
6627                         fallthrough;
6628                 case -NFS4ERR_ADMIN_REVOKED:
6629                 case -NFS4ERR_EXPIRED:
6630                         nfs4_free_revoked_stateid(calldata->server,
6631                                         &calldata->arg.stateid,
6632                                         task->tk_msg.rpc_cred);
6633                         fallthrough;
6634                 case -NFS4ERR_BAD_STATEID:
6635                 case -NFS4ERR_STALE_STATEID:
6636                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6637                                                 calldata->lsp))
6638                                 rpc_restart_call_prepare(task);
6639                         break;
6640                 case -NFS4ERR_OLD_STATEID:
6641                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6642                                                 calldata->lsp))
6643                                 rpc_restart_call_prepare(task);
6644                         break;
6645                 default:
6646                         task->tk_status = nfs4_async_handle_exception(task,
6647                                         calldata->server, task->tk_status,
6648                                         &exception);
6649                         if (exception.retry)
6650                                 rpc_restart_call_prepare(task);
6651         }
6652         nfs_release_seqid(calldata->arg.seqid);
6653 }
6654
6655 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6656 {
6657         struct nfs4_unlockdata *calldata = data;
6658
6659         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6660                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6661                 return;
6662
6663         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6664                 goto out_wait;
6665         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6666                 /* Note: exit _without_ running nfs4_locku_done */
6667                 goto out_no_action;
6668         }
6669         calldata->timestamp = jiffies;
6670         if (nfs4_setup_sequence(calldata->server->nfs_client,
6671                                 &calldata->arg.seq_args,
6672                                 &calldata->res.seq_res,
6673                                 task) != 0)
6674                 nfs_release_seqid(calldata->arg.seqid);
6675         return;
6676 out_no_action:
6677         task->tk_action = NULL;
6678 out_wait:
6679         nfs4_sequence_done(task, &calldata->res.seq_res);
6680 }
6681
6682 static const struct rpc_call_ops nfs4_locku_ops = {
6683         .rpc_call_prepare = nfs4_locku_prepare,
6684         .rpc_call_done = nfs4_locku_done,
6685         .rpc_release = nfs4_locku_release_calldata,
6686 };
6687
6688 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6689                 struct nfs_open_context *ctx,
6690                 struct nfs4_lock_state *lsp,
6691                 struct nfs_seqid *seqid)
6692 {
6693         struct nfs4_unlockdata *data;
6694         struct rpc_message msg = {
6695                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6696                 .rpc_cred = ctx->cred,
6697         };
6698         struct rpc_task_setup task_setup_data = {
6699                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6700                 .rpc_message = &msg,
6701                 .callback_ops = &nfs4_locku_ops,
6702                 .workqueue = nfsiod_workqueue,
6703                 .flags = RPC_TASK_ASYNC,
6704         };
6705
6706         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6707                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6708
6709         /* Ensure this is an unlock - when canceling a lock, the
6710          * canceled lock is passed in, and it won't be an unlock.
6711          */
6712         fl->fl_type = F_UNLCK;
6713         if (fl->fl_flags & FL_CLOSE)
6714                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6715
6716         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6717         if (data == NULL) {
6718                 nfs_free_seqid(seqid);
6719                 return ERR_PTR(-ENOMEM);
6720         }
6721
6722         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6723         msg.rpc_argp = &data->arg;
6724         msg.rpc_resp = &data->res;
6725         task_setup_data.callback_data = data;
6726         return rpc_run_task(&task_setup_data);
6727 }
6728
6729 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6730 {
6731         struct inode *inode = state->inode;
6732         struct nfs4_state_owner *sp = state->owner;
6733         struct nfs_inode *nfsi = NFS_I(inode);
6734         struct nfs_seqid *seqid;
6735         struct nfs4_lock_state *lsp;
6736         struct rpc_task *task;
6737         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6738         int status = 0;
6739         unsigned char fl_flags = request->fl_flags;
6740
6741         status = nfs4_set_lock_state(state, request);
6742         /* Unlock _before_ we do the RPC call */
6743         request->fl_flags |= FL_EXISTS;
6744         /* Exclude nfs_delegation_claim_locks() */
6745         mutex_lock(&sp->so_delegreturn_mutex);
6746         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
6747         down_read(&nfsi->rwsem);
6748         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
6749                 up_read(&nfsi->rwsem);
6750                 mutex_unlock(&sp->so_delegreturn_mutex);
6751                 goto out;
6752         }
6753         up_read(&nfsi->rwsem);
6754         mutex_unlock(&sp->so_delegreturn_mutex);
6755         if (status != 0)
6756                 goto out;
6757         /* Is this a delegated lock? */
6758         lsp = request->fl_u.nfs4_fl.owner;
6759         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
6760                 goto out;
6761         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
6762         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
6763         status = -ENOMEM;
6764         if (IS_ERR(seqid))
6765                 goto out;
6766         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
6767         status = PTR_ERR(task);
6768         if (IS_ERR(task))
6769                 goto out;
6770         status = rpc_wait_for_completion_task(task);
6771         rpc_put_task(task);
6772 out:
6773         request->fl_flags = fl_flags;
6774         trace_nfs4_unlock(request, state, F_SETLK, status);
6775         return status;
6776 }
6777
6778 struct nfs4_lockdata {
6779         struct nfs_lock_args arg;
6780         struct nfs_lock_res res;
6781         struct nfs4_lock_state *lsp;
6782         struct nfs_open_context *ctx;
6783         struct file_lock fl;
6784         unsigned long timestamp;
6785         int rpc_status;
6786         int cancelled;
6787         struct nfs_server *server;
6788 };
6789
6790 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
6791                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
6792                 gfp_t gfp_mask)
6793 {
6794         struct nfs4_lockdata *p;
6795         struct inode *inode = lsp->ls_state->inode;
6796         struct nfs_server *server = NFS_SERVER(inode);
6797         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6798
6799         p = kzalloc(sizeof(*p), gfp_mask);
6800         if (p == NULL)
6801                 return NULL;
6802
6803         p->arg.fh = NFS_FH(inode);
6804         p->arg.fl = &p->fl;
6805         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
6806         if (IS_ERR(p->arg.open_seqid))
6807                 goto out_free;
6808         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
6809         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
6810         if (IS_ERR(p->arg.lock_seqid))
6811                 goto out_free_seqid;
6812         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
6813         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
6814         p->arg.lock_owner.s_dev = server->s_dev;
6815         p->res.lock_seqid = p->arg.lock_seqid;
6816         p->lsp = lsp;
6817         p->server = server;
6818         p->ctx = get_nfs_open_context(ctx);
6819         locks_init_lock(&p->fl);
6820         locks_copy_lock(&p->fl, fl);
6821         return p;
6822 out_free_seqid:
6823         nfs_free_seqid(p->arg.open_seqid);
6824 out_free:
6825         kfree(p);
6826         return NULL;
6827 }
6828
6829 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
6830 {
6831         struct nfs4_lockdata *data = calldata;
6832         struct nfs4_state *state = data->lsp->ls_state;
6833
6834         dprintk("%s: begin!\n", __func__);
6835         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
6836                 goto out_wait;
6837         /* Do we need to do an open_to_lock_owner? */
6838         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
6839                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
6840                         goto out_release_lock_seqid;
6841                 }
6842                 nfs4_stateid_copy(&data->arg.open_stateid,
6843                                 &state->open_stateid);
6844                 data->arg.new_lock_owner = 1;
6845                 data->res.open_seqid = data->arg.open_seqid;
6846         } else {
6847                 data->arg.new_lock_owner = 0;
6848                 nfs4_stateid_copy(&data->arg.lock_stateid,
6849                                 &data->lsp->ls_stateid);
6850         }
6851         if (!nfs4_valid_open_stateid(state)) {
6852                 data->rpc_status = -EBADF;
6853                 task->tk_action = NULL;
6854                 goto out_release_open_seqid;
6855         }
6856         data->timestamp = jiffies;
6857         if (nfs4_setup_sequence(data->server->nfs_client,
6858                                 &data->arg.seq_args,
6859                                 &data->res.seq_res,
6860                                 task) == 0)
6861                 return;
6862 out_release_open_seqid:
6863         nfs_release_seqid(data->arg.open_seqid);
6864 out_release_lock_seqid:
6865         nfs_release_seqid(data->arg.lock_seqid);
6866 out_wait:
6867         nfs4_sequence_done(task, &data->res.seq_res);
6868         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
6869 }
6870
6871 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
6872 {
6873         struct nfs4_lockdata *data = calldata;
6874         struct nfs4_lock_state *lsp = data->lsp;
6875
6876         dprintk("%s: begin!\n", __func__);
6877
6878         if (!nfs4_sequence_done(task, &data->res.seq_res))
6879                 return;
6880
6881         data->rpc_status = task->tk_status;
6882         switch (task->tk_status) {
6883         case 0:
6884                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
6885                                 data->timestamp);
6886                 if (data->arg.new_lock && !data->cancelled) {
6887                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
6888                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
6889                                 goto out_restart;
6890                 }
6891                 if (data->arg.new_lock_owner != 0) {
6892                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
6893                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
6894                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6895                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
6896                         goto out_restart;
6897                 break;
6898         case -NFS4ERR_BAD_STATEID:
6899         case -NFS4ERR_OLD_STATEID:
6900         case -NFS4ERR_STALE_STATEID:
6901         case -NFS4ERR_EXPIRED:
6902                 if (data->arg.new_lock_owner != 0) {
6903                         if (!nfs4_stateid_match(&data->arg.open_stateid,
6904                                                 &lsp->ls_state->open_stateid))
6905                                 goto out_restart;
6906                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
6907                                                 &lsp->ls_stateid))
6908                                 goto out_restart;
6909         }
6910 out_done:
6911         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
6912         return;
6913 out_restart:
6914         if (!data->cancelled)
6915                 rpc_restart_call_prepare(task);
6916         goto out_done;
6917 }
6918
6919 static void nfs4_lock_release(void *calldata)
6920 {
6921         struct nfs4_lockdata *data = calldata;
6922
6923         dprintk("%s: begin!\n", __func__);
6924         nfs_free_seqid(data->arg.open_seqid);
6925         if (data->cancelled && data->rpc_status == 0) {
6926                 struct rpc_task *task;
6927                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
6928                                 data->arg.lock_seqid);
6929                 if (!IS_ERR(task))
6930                         rpc_put_task_async(task);
6931                 dprintk("%s: cancelling lock!\n", __func__);
6932         } else
6933                 nfs_free_seqid(data->arg.lock_seqid);
6934         nfs4_put_lock_state(data->lsp);
6935         put_nfs_open_context(data->ctx);
6936         kfree(data);
6937         dprintk("%s: done!\n", __func__);
6938 }
6939
6940 static const struct rpc_call_ops nfs4_lock_ops = {
6941         .rpc_call_prepare = nfs4_lock_prepare,
6942         .rpc_call_done = nfs4_lock_done,
6943         .rpc_release = nfs4_lock_release,
6944 };
6945
6946 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
6947 {
6948         switch (error) {
6949         case -NFS4ERR_ADMIN_REVOKED:
6950         case -NFS4ERR_EXPIRED:
6951         case -NFS4ERR_BAD_STATEID:
6952                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6953                 if (new_lock_owner != 0 ||
6954                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
6955                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
6956                 break;
6957         case -NFS4ERR_STALE_STATEID:
6958                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6959                 nfs4_schedule_lease_recovery(server->nfs_client);
6960         }
6961 }
6962
6963 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
6964 {
6965         struct nfs4_lockdata *data;
6966         struct rpc_task *task;
6967         struct rpc_message msg = {
6968                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
6969                 .rpc_cred = state->owner->so_cred,
6970         };
6971         struct rpc_task_setup task_setup_data = {
6972                 .rpc_client = NFS_CLIENT(state->inode),
6973                 .rpc_message = &msg,
6974                 .callback_ops = &nfs4_lock_ops,
6975                 .workqueue = nfsiod_workqueue,
6976                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
6977         };
6978         int ret;
6979
6980         dprintk("%s: begin!\n", __func__);
6981         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
6982                         fl->fl_u.nfs4_fl.owner,
6983                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
6984         if (data == NULL)
6985                 return -ENOMEM;
6986         if (IS_SETLKW(cmd))
6987                 data->arg.block = 1;
6988         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
6989                                 recovery_type > NFS_LOCK_NEW);
6990         msg.rpc_argp = &data->arg;
6991         msg.rpc_resp = &data->res;
6992         task_setup_data.callback_data = data;
6993         if (recovery_type > NFS_LOCK_NEW) {
6994                 if (recovery_type == NFS_LOCK_RECLAIM)
6995                         data->arg.reclaim = NFS_LOCK_RECLAIM;
6996         } else
6997                 data->arg.new_lock = 1;
6998         task = rpc_run_task(&task_setup_data);
6999         if (IS_ERR(task))
7000                 return PTR_ERR(task);
7001         ret = rpc_wait_for_completion_task(task);
7002         if (ret == 0) {
7003                 ret = data->rpc_status;
7004                 if (ret)
7005                         nfs4_handle_setlk_error(data->server, data->lsp,
7006                                         data->arg.new_lock_owner, ret);
7007         } else
7008                 data->cancelled = true;
7009         rpc_put_task(task);
7010         dprintk("%s: done, ret = %d!\n", __func__, ret);
7011         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7012         return ret;
7013 }
7014
7015 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7016 {
7017         struct nfs_server *server = NFS_SERVER(state->inode);
7018         struct nfs4_exception exception = {
7019                 .inode = state->inode,
7020         };
7021         int err;
7022
7023         do {
7024                 /* Cache the lock if possible... */
7025                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7026                         return 0;
7027                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7028                 if (err != -NFS4ERR_DELAY)
7029                         break;
7030                 nfs4_handle_exception(server, err, &exception);
7031         } while (exception.retry);
7032         return err;
7033 }
7034
7035 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7036 {
7037         struct nfs_server *server = NFS_SERVER(state->inode);
7038         struct nfs4_exception exception = {
7039                 .inode = state->inode,
7040         };
7041         int err;
7042
7043         err = nfs4_set_lock_state(state, request);
7044         if (err != 0)
7045                 return err;
7046         if (!recover_lost_locks) {
7047                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7048                 return 0;
7049         }
7050         do {
7051                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7052                         return 0;
7053                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7054                 switch (err) {
7055                 default:
7056                         goto out;
7057                 case -NFS4ERR_GRACE:
7058                 case -NFS4ERR_DELAY:
7059                         nfs4_handle_exception(server, err, &exception);
7060                         err = 0;
7061                 }
7062         } while (exception.retry);
7063 out:
7064         return err;
7065 }
7066
7067 #if defined(CONFIG_NFS_V4_1)
7068 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7069 {
7070         struct nfs4_lock_state *lsp;
7071         int status;
7072
7073         status = nfs4_set_lock_state(state, request);
7074         if (status != 0)
7075                 return status;
7076         lsp = request->fl_u.nfs4_fl.owner;
7077         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7078             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7079                 return 0;
7080         return nfs4_lock_expired(state, request);
7081 }
7082 #endif
7083
7084 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7085 {
7086         struct nfs_inode *nfsi = NFS_I(state->inode);
7087         struct nfs4_state_owner *sp = state->owner;
7088         unsigned char fl_flags = request->fl_flags;
7089         int status;
7090
7091         request->fl_flags |= FL_ACCESS;
7092         status = locks_lock_inode_wait(state->inode, request);
7093         if (status < 0)
7094                 goto out;
7095         mutex_lock(&sp->so_delegreturn_mutex);
7096         down_read(&nfsi->rwsem);
7097         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7098                 /* Yes: cache locks! */
7099                 /* ...but avoid races with delegation recall... */
7100                 request->fl_flags = fl_flags & ~FL_SLEEP;
7101                 status = locks_lock_inode_wait(state->inode, request);
7102                 up_read(&nfsi->rwsem);
7103                 mutex_unlock(&sp->so_delegreturn_mutex);
7104                 goto out;
7105         }
7106         up_read(&nfsi->rwsem);
7107         mutex_unlock(&sp->so_delegreturn_mutex);
7108         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7109 out:
7110         request->fl_flags = fl_flags;
7111         return status;
7112 }
7113
7114 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7115 {
7116         struct nfs4_exception exception = {
7117                 .state = state,
7118                 .inode = state->inode,
7119                 .interruptible = true,
7120         };
7121         int err;
7122
7123         do {
7124                 err = _nfs4_proc_setlk(state, cmd, request);
7125                 if (err == -NFS4ERR_DENIED)
7126                         err = -EAGAIN;
7127                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7128                                 err, &exception);
7129         } while (exception.retry);
7130         return err;
7131 }
7132
7133 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7134 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7135
7136 static int
7137 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7138                         struct file_lock *request)
7139 {
7140         int             status = -ERESTARTSYS;
7141         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7142
7143         while(!signalled()) {
7144                 status = nfs4_proc_setlk(state, cmd, request);
7145                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7146                         break;
7147                 freezable_schedule_timeout_interruptible(timeout);
7148                 timeout *= 2;
7149                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7150                 status = -ERESTARTSYS;
7151         }
7152         return status;
7153 }
7154
7155 #ifdef CONFIG_NFS_V4_1
7156 struct nfs4_lock_waiter {
7157         struct task_struct      *task;
7158         struct inode            *inode;
7159         struct nfs_lowner       *owner;
7160 };
7161
7162 static int
7163 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7164 {
7165         int ret;
7166         struct nfs4_lock_waiter *waiter = wait->private;
7167
7168         /* NULL key means to wake up everyone */
7169         if (key) {
7170                 struct cb_notify_lock_args      *cbnl = key;
7171                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7172                                                 *wowner = waiter->owner;
7173
7174                 /* Only wake if the callback was for the same owner. */
7175                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7176                         return 0;
7177
7178                 /* Make sure it's for the right inode */
7179                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7180                         return 0;
7181         }
7182
7183         /* override "private" so we can use default_wake_function */
7184         wait->private = waiter->task;
7185         ret = woken_wake_function(wait, mode, flags, key);
7186         if (ret)
7187                 list_del_init(&wait->entry);
7188         wait->private = waiter;
7189         return ret;
7190 }
7191
7192 static int
7193 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7194 {
7195         int status = -ERESTARTSYS;
7196         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7197         struct nfs_server *server = NFS_SERVER(state->inode);
7198         struct nfs_client *clp = server->nfs_client;
7199         wait_queue_head_t *q = &clp->cl_lock_waitq;
7200         struct nfs_lowner owner = { .clientid = clp->cl_clientid,
7201                                     .id = lsp->ls_seqid.owner_id,
7202                                     .s_dev = server->s_dev };
7203         struct nfs4_lock_waiter waiter = { .task  = current,
7204                                            .inode = state->inode,
7205                                            .owner = &owner};
7206         wait_queue_entry_t wait;
7207
7208         /* Don't bother with waitqueue if we don't expect a callback */
7209         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7210                 return nfs4_retry_setlk_simple(state, cmd, request);
7211
7212         init_wait(&wait);
7213         wait.private = &waiter;
7214         wait.func = nfs4_wake_lock_waiter;
7215
7216         while(!signalled()) {
7217                 add_wait_queue(q, &wait);
7218                 status = nfs4_proc_setlk(state, cmd, request);
7219                 if ((status != -EAGAIN) || IS_SETLK(cmd)) {
7220                         finish_wait(q, &wait);
7221                         break;
7222                 }
7223
7224                 status = -ERESTARTSYS;
7225                 freezer_do_not_count();
7226                 wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT);
7227                 freezer_count();
7228                 finish_wait(q, &wait);
7229         }
7230
7231         return status;
7232 }
7233 #else /* !CONFIG_NFS_V4_1 */
7234 static inline int
7235 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7236 {
7237         return nfs4_retry_setlk_simple(state, cmd, request);
7238 }
7239 #endif
7240
7241 static int
7242 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7243 {
7244         struct nfs_open_context *ctx;
7245         struct nfs4_state *state;
7246         int status;
7247
7248         /* verify open state */
7249         ctx = nfs_file_open_context(filp);
7250         state = ctx->state;
7251
7252         if (IS_GETLK(cmd)) {
7253                 if (state != NULL)
7254                         return nfs4_proc_getlk(state, F_GETLK, request);
7255                 return 0;
7256         }
7257
7258         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7259                 return -EINVAL;
7260
7261         if (request->fl_type == F_UNLCK) {
7262                 if (state != NULL)
7263                         return nfs4_proc_unlck(state, cmd, request);
7264                 return 0;
7265         }
7266
7267         if (state == NULL)
7268                 return -ENOLCK;
7269
7270         if ((request->fl_flags & FL_POSIX) &&
7271             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7272                 return -ENOLCK;
7273
7274         /*
7275          * Don't rely on the VFS having checked the file open mode,
7276          * since it won't do this for flock() locks.
7277          */
7278         switch (request->fl_type) {
7279         case F_RDLCK:
7280                 if (!(filp->f_mode & FMODE_READ))
7281                         return -EBADF;
7282                 break;
7283         case F_WRLCK:
7284                 if (!(filp->f_mode & FMODE_WRITE))
7285                         return -EBADF;
7286         }
7287
7288         status = nfs4_set_lock_state(state, request);
7289         if (status != 0)
7290                 return status;
7291
7292         return nfs4_retry_setlk(state, cmd, request);
7293 }
7294
7295 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7296 {
7297         struct nfs_server *server = NFS_SERVER(state->inode);
7298         int err;
7299
7300         err = nfs4_set_lock_state(state, fl);
7301         if (err != 0)
7302                 return err;
7303         do {
7304                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7305                 if (err != -NFS4ERR_DELAY)
7306                         break;
7307                 ssleep(1);
7308         } while (err == -NFS4ERR_DELAY);
7309         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7310 }
7311
7312 struct nfs_release_lockowner_data {
7313         struct nfs4_lock_state *lsp;
7314         struct nfs_server *server;
7315         struct nfs_release_lockowner_args args;
7316         struct nfs_release_lockowner_res res;
7317         unsigned long timestamp;
7318 };
7319
7320 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7321 {
7322         struct nfs_release_lockowner_data *data = calldata;
7323         struct nfs_server *server = data->server;
7324         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7325                            &data->res.seq_res, task);
7326         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7327         data->timestamp = jiffies;
7328 }
7329
7330 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7331 {
7332         struct nfs_release_lockowner_data *data = calldata;
7333         struct nfs_server *server = data->server;
7334
7335         nfs40_sequence_done(task, &data->res.seq_res);
7336
7337         switch (task->tk_status) {
7338         case 0:
7339                 renew_lease(server, data->timestamp);
7340                 break;
7341         case -NFS4ERR_STALE_CLIENTID:
7342         case -NFS4ERR_EXPIRED:
7343                 nfs4_schedule_lease_recovery(server->nfs_client);
7344                 break;
7345         case -NFS4ERR_LEASE_MOVED:
7346         case -NFS4ERR_DELAY:
7347                 if (nfs4_async_handle_error(task, server,
7348                                             NULL, NULL) == -EAGAIN)
7349                         rpc_restart_call_prepare(task);
7350         }
7351 }
7352
7353 static void nfs4_release_lockowner_release(void *calldata)
7354 {
7355         struct nfs_release_lockowner_data *data = calldata;
7356         nfs4_free_lock_state(data->server, data->lsp);
7357         kfree(calldata);
7358 }
7359
7360 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7361         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7362         .rpc_call_done = nfs4_release_lockowner_done,
7363         .rpc_release = nfs4_release_lockowner_release,
7364 };
7365
7366 static void
7367 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7368 {
7369         struct nfs_release_lockowner_data *data;
7370         struct rpc_message msg = {
7371                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7372         };
7373
7374         if (server->nfs_client->cl_mvops->minor_version != 0)
7375                 return;
7376
7377         data = kmalloc(sizeof(*data), GFP_NOFS);
7378         if (!data)
7379                 return;
7380         data->lsp = lsp;
7381         data->server = server;
7382         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7383         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7384         data->args.lock_owner.s_dev = server->s_dev;
7385
7386         msg.rpc_argp = &data->args;
7387         msg.rpc_resp = &data->res;
7388         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7389         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7390 }
7391
7392 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7393
7394 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7395                                    struct dentry *unused, struct inode *inode,
7396                                    const char *key, const void *buf,
7397                                    size_t buflen, int flags)
7398 {
7399         return nfs4_proc_set_acl(inode, buf, buflen);
7400 }
7401
7402 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7403                                    struct dentry *unused, struct inode *inode,
7404                                    const char *key, void *buf, size_t buflen)
7405 {
7406         return nfs4_proc_get_acl(inode, buf, buflen);
7407 }
7408
7409 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7410 {
7411         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
7412 }
7413
7414 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7415
7416 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7417                                      struct dentry *unused, struct inode *inode,
7418                                      const char *key, const void *buf,
7419                                      size_t buflen, int flags)
7420 {
7421         if (security_ismaclabel(key))
7422                 return nfs4_set_security_label(inode, buf, buflen);
7423
7424         return -EOPNOTSUPP;
7425 }
7426
7427 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7428                                      struct dentry *unused, struct inode *inode,
7429                                      const char *key, void *buf, size_t buflen)
7430 {
7431         if (security_ismaclabel(key))
7432                 return nfs4_get_security_label(inode, buf, buflen);
7433         return -EOPNOTSUPP;
7434 }
7435
7436 static ssize_t
7437 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7438 {
7439         int len = 0;
7440
7441         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7442                 len = security_inode_listsecurity(inode, list, list_len);
7443                 if (list_len && len > list_len)
7444                         return -ERANGE;
7445         }
7446         return len;
7447 }
7448
7449 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7450         .prefix = XATTR_SECURITY_PREFIX,
7451         .get    = nfs4_xattr_get_nfs4_label,
7452         .set    = nfs4_xattr_set_nfs4_label,
7453 };
7454
7455 #else
7456
7457 static ssize_t
7458 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7459 {
7460         return 0;
7461 }
7462
7463 #endif
7464
7465 #ifdef CONFIG_NFS_V4_2
7466 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7467                                     struct dentry *unused, struct inode *inode,
7468                                     const char *key, const void *buf,
7469                                     size_t buflen, int flags)
7470 {
7471         struct nfs_access_entry cache;
7472         int ret;
7473
7474         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7475                 return -EOPNOTSUPP;
7476
7477         /*
7478          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7479          * flags right now. Handling of xattr operations use the normal
7480          * file read/write permissions.
7481          *
7482          * Just in case the server has other ideas (which RFC 8276 allows),
7483          * do a cached access check for the XA* flags to possibly avoid
7484          * doing an RPC and getting EACCES back.
7485          */
7486         if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7487                 if (!(cache.mask & NFS_ACCESS_XAWRITE))
7488                         return -EACCES;
7489         }
7490
7491         if (buf == NULL) {
7492                 ret = nfs42_proc_removexattr(inode, key);
7493                 if (!ret)
7494                         nfs4_xattr_cache_remove(inode, key);
7495         } else {
7496                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7497                 if (!ret)
7498                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7499         }
7500
7501         return ret;
7502 }
7503
7504 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7505                                     struct dentry *unused, struct inode *inode,
7506                                     const char *key, void *buf, size_t buflen)
7507 {
7508         struct nfs_access_entry cache;
7509         ssize_t ret;
7510
7511         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7512                 return -EOPNOTSUPP;
7513
7514         if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7515                 if (!(cache.mask & NFS_ACCESS_XAREAD))
7516                         return -EACCES;
7517         }
7518
7519         ret = nfs_revalidate_inode(NFS_SERVER(inode), inode);
7520         if (ret)
7521                 return ret;
7522
7523         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7524         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7525                 return ret;
7526
7527         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7528
7529         return ret;
7530 }
7531
7532 static ssize_t
7533 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7534 {
7535         u64 cookie;
7536         bool eof;
7537         ssize_t ret, size;
7538         char *buf;
7539         size_t buflen;
7540         struct nfs_access_entry cache;
7541
7542         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7543                 return 0;
7544
7545         if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7546                 if (!(cache.mask & NFS_ACCESS_XALIST))
7547                         return 0;
7548         }
7549
7550         ret = nfs_revalidate_inode(NFS_SERVER(inode), inode);
7551         if (ret)
7552                 return ret;
7553
7554         ret = nfs4_xattr_cache_list(inode, list, list_len);
7555         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7556                 return ret;
7557
7558         cookie = 0;
7559         eof = false;
7560         buflen = list_len ? list_len : XATTR_LIST_MAX;
7561         buf = list_len ? list : NULL;
7562         size = 0;
7563
7564         while (!eof) {
7565                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7566                     &cookie, &eof);
7567                 if (ret < 0)
7568                         return ret;
7569
7570                 if (list_len) {
7571                         buf += ret;
7572                         buflen -= ret;
7573                 }
7574                 size += ret;
7575         }
7576
7577         if (list_len)
7578                 nfs4_xattr_cache_set_list(inode, list, size);
7579
7580         return size;
7581 }
7582
7583 #else
7584
7585 static ssize_t
7586 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7587 {
7588         return 0;
7589 }
7590 #endif /* CONFIG_NFS_V4_2 */
7591
7592 /*
7593  * nfs_fhget will use either the mounted_on_fileid or the fileid
7594  */
7595 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7596 {
7597         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7598                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7599               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7600               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7601                 return;
7602
7603         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7604                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7605         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7606         fattr->nlink = 2;
7607 }
7608
7609 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7610                                    const struct qstr *name,
7611                                    struct nfs4_fs_locations *fs_locations,
7612                                    struct page *page)
7613 {
7614         struct nfs_server *server = NFS_SERVER(dir);
7615         u32 bitmask[3];
7616         struct nfs4_fs_locations_arg args = {
7617                 .dir_fh = NFS_FH(dir),
7618                 .name = name,
7619                 .page = page,
7620                 .bitmask = bitmask,
7621         };
7622         struct nfs4_fs_locations_res res = {
7623                 .fs_locations = fs_locations,
7624         };
7625         struct rpc_message msg = {
7626                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7627                 .rpc_argp = &args,
7628                 .rpc_resp = &res,
7629         };
7630         int status;
7631
7632         dprintk("%s: start\n", __func__);
7633
7634         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7635         bitmask[1] = nfs4_fattr_bitmap[1];
7636
7637         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7638          * is not supported */
7639         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7640                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7641         else
7642                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7643
7644         nfs_fattr_init(&fs_locations->fattr);
7645         fs_locations->server = server;
7646         fs_locations->nlocations = 0;
7647         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7648         dprintk("%s: returned status = %d\n", __func__, status);
7649         return status;
7650 }
7651
7652 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7653                            const struct qstr *name,
7654                            struct nfs4_fs_locations *fs_locations,
7655                            struct page *page)
7656 {
7657         struct nfs4_exception exception = {
7658                 .interruptible = true,
7659         };
7660         int err;
7661         do {
7662                 err = _nfs4_proc_fs_locations(client, dir, name,
7663                                 fs_locations, page);
7664                 trace_nfs4_get_fs_locations(dir, name, err);
7665                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7666                                 &exception);
7667         } while (exception.retry);
7668         return err;
7669 }
7670
7671 /*
7672  * This operation also signals the server that this client is
7673  * performing migration recovery.  The server can stop returning
7674  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
7675  * appended to this compound to identify the client ID which is
7676  * performing recovery.
7677  */
7678 static int _nfs40_proc_get_locations(struct inode *inode,
7679                                      struct nfs4_fs_locations *locations,
7680                                      struct page *page, const struct cred *cred)
7681 {
7682         struct nfs_server *server = NFS_SERVER(inode);
7683         struct rpc_clnt *clnt = server->client;
7684         u32 bitmask[2] = {
7685                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7686         };
7687         struct nfs4_fs_locations_arg args = {
7688                 .clientid       = server->nfs_client->cl_clientid,
7689                 .fh             = NFS_FH(inode),
7690                 .page           = page,
7691                 .bitmask        = bitmask,
7692                 .migration      = 1,            /* skip LOOKUP */
7693                 .renew          = 1,            /* append RENEW */
7694         };
7695         struct nfs4_fs_locations_res res = {
7696                 .fs_locations   = locations,
7697                 .migration      = 1,
7698                 .renew          = 1,
7699         };
7700         struct rpc_message msg = {
7701                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7702                 .rpc_argp       = &args,
7703                 .rpc_resp       = &res,
7704                 .rpc_cred       = cred,
7705         };
7706         unsigned long now = jiffies;
7707         int status;
7708
7709         nfs_fattr_init(&locations->fattr);
7710         locations->server = server;
7711         locations->nlocations = 0;
7712
7713         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7714         status = nfs4_call_sync_sequence(clnt, server, &msg,
7715                                         &args.seq_args, &res.seq_res);
7716         if (status)
7717                 return status;
7718
7719         renew_lease(server, now);
7720         return 0;
7721 }
7722
7723 #ifdef CONFIG_NFS_V4_1
7724
7725 /*
7726  * This operation also signals the server that this client is
7727  * performing migration recovery.  The server can stop asserting
7728  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
7729  * performing this operation is identified in the SEQUENCE
7730  * operation in this compound.
7731  *
7732  * When the client supports GETATTR(fs_locations_info), it can
7733  * be plumbed in here.
7734  */
7735 static int _nfs41_proc_get_locations(struct inode *inode,
7736                                      struct nfs4_fs_locations *locations,
7737                                      struct page *page, const struct cred *cred)
7738 {
7739         struct nfs_server *server = NFS_SERVER(inode);
7740         struct rpc_clnt *clnt = server->client;
7741         u32 bitmask[2] = {
7742                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7743         };
7744         struct nfs4_fs_locations_arg args = {
7745                 .fh             = NFS_FH(inode),
7746                 .page           = page,
7747                 .bitmask        = bitmask,
7748                 .migration      = 1,            /* skip LOOKUP */
7749         };
7750         struct nfs4_fs_locations_res res = {
7751                 .fs_locations   = locations,
7752                 .migration      = 1,
7753         };
7754         struct rpc_message msg = {
7755                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7756                 .rpc_argp       = &args,
7757                 .rpc_resp       = &res,
7758                 .rpc_cred       = cred,
7759         };
7760         int status;
7761
7762         nfs_fattr_init(&locations->fattr);
7763         locations->server = server;
7764         locations->nlocations = 0;
7765
7766         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7767         status = nfs4_call_sync_sequence(clnt, server, &msg,
7768                                         &args.seq_args, &res.seq_res);
7769         if (status == NFS4_OK &&
7770             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7771                 status = -NFS4ERR_LEASE_MOVED;
7772         return status;
7773 }
7774
7775 #endif  /* CONFIG_NFS_V4_1 */
7776
7777 /**
7778  * nfs4_proc_get_locations - discover locations for a migrated FSID
7779  * @inode: inode on FSID that is migrating
7780  * @locations: result of query
7781  * @page: buffer
7782  * @cred: credential to use for this operation
7783  *
7784  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
7785  * operation failed, or a negative errno if a local error occurred.
7786  *
7787  * On success, "locations" is filled in, but if the server has
7788  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
7789  * asserted.
7790  *
7791  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
7792  * from this client that require migration recovery.
7793  */
7794 int nfs4_proc_get_locations(struct inode *inode,
7795                             struct nfs4_fs_locations *locations,
7796                             struct page *page, const struct cred *cred)
7797 {
7798         struct nfs_server *server = NFS_SERVER(inode);
7799         struct nfs_client *clp = server->nfs_client;
7800         const struct nfs4_mig_recovery_ops *ops =
7801                                         clp->cl_mvops->mig_recovery_ops;
7802         struct nfs4_exception exception = {
7803                 .interruptible = true,
7804         };
7805         int status;
7806
7807         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7808                 (unsigned long long)server->fsid.major,
7809                 (unsigned long long)server->fsid.minor,
7810                 clp->cl_hostname);
7811         nfs_display_fhandle(NFS_FH(inode), __func__);
7812
7813         do {
7814                 status = ops->get_locations(inode, locations, page, cred);
7815                 if (status != -NFS4ERR_DELAY)
7816                         break;
7817                 nfs4_handle_exception(server, status, &exception);
7818         } while (exception.retry);
7819         return status;
7820 }
7821
7822 /*
7823  * This operation also signals the server that this client is
7824  * performing "lease moved" recovery.  The server can stop
7825  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
7826  * is appended to this compound to identify the client ID which is
7827  * performing recovery.
7828  */
7829 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
7830 {
7831         struct nfs_server *server = NFS_SERVER(inode);
7832         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
7833         struct rpc_clnt *clnt = server->client;
7834         struct nfs4_fsid_present_arg args = {
7835                 .fh             = NFS_FH(inode),
7836                 .clientid       = clp->cl_clientid,
7837                 .renew          = 1,            /* append RENEW */
7838         };
7839         struct nfs4_fsid_present_res res = {
7840                 .renew          = 1,
7841         };
7842         struct rpc_message msg = {
7843                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7844                 .rpc_argp       = &args,
7845                 .rpc_resp       = &res,
7846                 .rpc_cred       = cred,
7847         };
7848         unsigned long now = jiffies;
7849         int status;
7850
7851         res.fh = nfs_alloc_fhandle();
7852         if (res.fh == NULL)
7853                 return -ENOMEM;
7854
7855         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7856         status = nfs4_call_sync_sequence(clnt, server, &msg,
7857                                                 &args.seq_args, &res.seq_res);
7858         nfs_free_fhandle(res.fh);
7859         if (status)
7860                 return status;
7861
7862         do_renew_lease(clp, now);
7863         return 0;
7864 }
7865
7866 #ifdef CONFIG_NFS_V4_1
7867
7868 /*
7869  * This operation also signals the server that this client is
7870  * performing "lease moved" recovery.  The server can stop asserting
7871  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
7872  * this operation is identified in the SEQUENCE operation in this
7873  * compound.
7874  */
7875 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
7876 {
7877         struct nfs_server *server = NFS_SERVER(inode);
7878         struct rpc_clnt *clnt = server->client;
7879         struct nfs4_fsid_present_arg args = {
7880                 .fh             = NFS_FH(inode),
7881         };
7882         struct nfs4_fsid_present_res res = {
7883         };
7884         struct rpc_message msg = {
7885                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7886                 .rpc_argp       = &args,
7887                 .rpc_resp       = &res,
7888                 .rpc_cred       = cred,
7889         };
7890         int status;
7891
7892         res.fh = nfs_alloc_fhandle();
7893         if (res.fh == NULL)
7894                 return -ENOMEM;
7895
7896         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7897         status = nfs4_call_sync_sequence(clnt, server, &msg,
7898                                                 &args.seq_args, &res.seq_res);
7899         nfs_free_fhandle(res.fh);
7900         if (status == NFS4_OK &&
7901             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7902                 status = -NFS4ERR_LEASE_MOVED;
7903         return status;
7904 }
7905
7906 #endif  /* CONFIG_NFS_V4_1 */
7907
7908 /**
7909  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
7910  * @inode: inode on FSID to check
7911  * @cred: credential to use for this operation
7912  *
7913  * Server indicates whether the FSID is present, moved, or not
7914  * recognized.  This operation is necessary to clear a LEASE_MOVED
7915  * condition for this client ID.
7916  *
7917  * Returns NFS4_OK if the FSID is present on this server,
7918  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
7919  *  NFS4ERR code if some error occurred on the server, or a
7920  *  negative errno if a local failure occurred.
7921  */
7922 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
7923 {
7924         struct nfs_server *server = NFS_SERVER(inode);
7925         struct nfs_client *clp = server->nfs_client;
7926         const struct nfs4_mig_recovery_ops *ops =
7927                                         clp->cl_mvops->mig_recovery_ops;
7928         struct nfs4_exception exception = {
7929                 .interruptible = true,
7930         };
7931         int status;
7932
7933         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7934                 (unsigned long long)server->fsid.major,
7935                 (unsigned long long)server->fsid.minor,
7936                 clp->cl_hostname);
7937         nfs_display_fhandle(NFS_FH(inode), __func__);
7938
7939         do {
7940                 status = ops->fsid_present(inode, cred);
7941                 if (status != -NFS4ERR_DELAY)
7942                         break;
7943                 nfs4_handle_exception(server, status, &exception);
7944         } while (exception.retry);
7945         return status;
7946 }
7947
7948 /*
7949  * If 'use_integrity' is true and the state managment nfs_client
7950  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
7951  * and the machine credential as per RFC3530bis and RFC5661 Security
7952  * Considerations sections. Otherwise, just use the user cred with the
7953  * filesystem's rpc_client.
7954  */
7955 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7956 {
7957         int status;
7958         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
7959         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
7960         struct nfs4_secinfo_arg args = {
7961                 .dir_fh = NFS_FH(dir),
7962                 .name   = name,
7963         };
7964         struct nfs4_secinfo_res res = {
7965                 .flavors     = flavors,
7966         };
7967         struct rpc_message msg = {
7968                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
7969                 .rpc_argp = &args,
7970                 .rpc_resp = &res,
7971         };
7972         struct nfs4_call_sync_data data = {
7973                 .seq_server = NFS_SERVER(dir),
7974                 .seq_args = &args.seq_args,
7975                 .seq_res = &res.seq_res,
7976         };
7977         struct rpc_task_setup task_setup = {
7978                 .rpc_client = clnt,
7979                 .rpc_message = &msg,
7980                 .callback_ops = clp->cl_mvops->call_sync_ops,
7981                 .callback_data = &data,
7982                 .flags = RPC_TASK_NO_ROUND_ROBIN,
7983         };
7984         const struct cred *cred = NULL;
7985
7986         if (use_integrity) {
7987                 clnt = clp->cl_rpcclient;
7988                 task_setup.rpc_client = clnt;
7989
7990                 cred = nfs4_get_clid_cred(clp);
7991                 msg.rpc_cred = cred;
7992         }
7993
7994         dprintk("NFS call  secinfo %s\n", name->name);
7995
7996         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
7997         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
7998         status = nfs4_call_sync_custom(&task_setup);
7999
8000         dprintk("NFS reply  secinfo: %d\n", status);
8001
8002         put_cred(cred);
8003         return status;
8004 }
8005
8006 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8007                       struct nfs4_secinfo_flavors *flavors)
8008 {
8009         struct nfs4_exception exception = {
8010                 .interruptible = true,
8011         };
8012         int err;
8013         do {
8014                 err = -NFS4ERR_WRONGSEC;
8015
8016                 /* try to use integrity protection with machine cred */
8017                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8018                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8019
8020                 /*
8021                  * if unable to use integrity protection, or SECINFO with
8022                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8023                  * disallowed by spec, but exists in deployed servers) use
8024                  * the current filesystem's rpc_client and the user cred.
8025                  */
8026                 if (err == -NFS4ERR_WRONGSEC)
8027                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8028
8029                 trace_nfs4_secinfo(dir, name, err);
8030                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8031                                 &exception);
8032         } while (exception.retry);
8033         return err;
8034 }
8035
8036 #ifdef CONFIG_NFS_V4_1
8037 /*
8038  * Check the exchange flags returned by the server for invalid flags, having
8039  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8040  * DS flags set.
8041  */
8042 static int nfs4_check_cl_exchange_flags(u32 flags)
8043 {
8044         if (flags & ~EXCHGID4_FLAG_MASK_R)
8045                 goto out_inval;
8046         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8047             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8048                 goto out_inval;
8049         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8050                 goto out_inval;
8051         return NFS_OK;
8052 out_inval:
8053         return -NFS4ERR_INVAL;
8054 }
8055
8056 static bool
8057 nfs41_same_server_scope(struct nfs41_server_scope *a,
8058                         struct nfs41_server_scope *b)
8059 {
8060         if (a->server_scope_sz != b->server_scope_sz)
8061                 return false;
8062         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8063 }
8064
8065 static void
8066 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8067 {
8068         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8069         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8070         struct nfs_client *clp = args->client;
8071
8072         switch (task->tk_status) {
8073         case -NFS4ERR_BADSESSION:
8074         case -NFS4ERR_DEADSESSION:
8075                 nfs4_schedule_session_recovery(clp->cl_session,
8076                                 task->tk_status);
8077         }
8078         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8079                         res->dir != NFS4_CDFS4_BOTH) {
8080                 rpc_task_close_connection(task);
8081                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8082                         rpc_restart_call(task);
8083         }
8084 }
8085
8086 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8087         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8088 };
8089
8090 /*
8091  * nfs4_proc_bind_one_conn_to_session()
8092  *
8093  * The 4.1 client currently uses the same TCP connection for the
8094  * fore and backchannel.
8095  */
8096 static
8097 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8098                 struct rpc_xprt *xprt,
8099                 struct nfs_client *clp,
8100                 const struct cred *cred)
8101 {
8102         int status;
8103         struct nfs41_bind_conn_to_session_args args = {
8104                 .client = clp,
8105                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8106                 .retries = 0,
8107         };
8108         struct nfs41_bind_conn_to_session_res res;
8109         struct rpc_message msg = {
8110                 .rpc_proc =
8111                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8112                 .rpc_argp = &args,
8113                 .rpc_resp = &res,
8114                 .rpc_cred = cred,
8115         };
8116         struct rpc_task_setup task_setup_data = {
8117                 .rpc_client = clnt,
8118                 .rpc_xprt = xprt,
8119                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8120                 .rpc_message = &msg,
8121                 .flags = RPC_TASK_TIMEOUT,
8122         };
8123         struct rpc_task *task;
8124
8125         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8126         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8127                 args.dir = NFS4_CDFC4_FORE;
8128
8129         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8130         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8131                 args.dir = NFS4_CDFC4_FORE;
8132
8133         task = rpc_run_task(&task_setup_data);
8134         if (!IS_ERR(task)) {
8135                 status = task->tk_status;
8136                 rpc_put_task(task);
8137         } else
8138                 status = PTR_ERR(task);
8139         trace_nfs4_bind_conn_to_session(clp, status);
8140         if (status == 0) {
8141                 if (memcmp(res.sessionid.data,
8142                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8143                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8144                         return -EIO;
8145                 }
8146                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8147                         dprintk("NFS: %s: Unexpected direction from server\n",
8148                                 __func__);
8149                         return -EIO;
8150                 }
8151                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8152                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8153                                 __func__);
8154                         return -EIO;
8155                 }
8156         }
8157
8158         return status;
8159 }
8160
8161 struct rpc_bind_conn_calldata {
8162         struct nfs_client *clp;
8163         const struct cred *cred;
8164 };
8165
8166 static int
8167 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8168                 struct rpc_xprt *xprt,
8169                 void *calldata)
8170 {
8171         struct rpc_bind_conn_calldata *p = calldata;
8172
8173         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8174 }
8175
8176 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8177 {
8178         struct rpc_bind_conn_calldata data = {
8179                 .clp = clp,
8180                 .cred = cred,
8181         };
8182         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8183                         nfs4_proc_bind_conn_to_session_callback, &data);
8184 }
8185
8186 /*
8187  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8188  * and operations we'd like to see to enable certain features in the allow map
8189  */
8190 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8191         .how = SP4_MACH_CRED,
8192         .enforce.u.words = {
8193                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8194                       1 << (OP_EXCHANGE_ID - 32) |
8195                       1 << (OP_CREATE_SESSION - 32) |
8196                       1 << (OP_DESTROY_SESSION - 32) |
8197                       1 << (OP_DESTROY_CLIENTID - 32)
8198         },
8199         .allow.u.words = {
8200                 [0] = 1 << (OP_CLOSE) |
8201                       1 << (OP_OPEN_DOWNGRADE) |
8202                       1 << (OP_LOCKU) |
8203                       1 << (OP_DELEGRETURN) |
8204                       1 << (OP_COMMIT),
8205                 [1] = 1 << (OP_SECINFO - 32) |
8206                       1 << (OP_SECINFO_NO_NAME - 32) |
8207                       1 << (OP_LAYOUTRETURN - 32) |
8208                       1 << (OP_TEST_STATEID - 32) |
8209                       1 << (OP_FREE_STATEID - 32) |
8210                       1 << (OP_WRITE - 32)
8211         }
8212 };
8213
8214 /*
8215  * Select the state protection mode for client `clp' given the server results
8216  * from exchange_id in `sp'.
8217  *
8218  * Returns 0 on success, negative errno otherwise.
8219  */
8220 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8221                                  struct nfs41_state_protection *sp)
8222 {
8223         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8224                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8225                       1 << (OP_EXCHANGE_ID - 32) |
8226                       1 << (OP_CREATE_SESSION - 32) |
8227                       1 << (OP_DESTROY_SESSION - 32) |
8228                       1 << (OP_DESTROY_CLIENTID - 32)
8229         };
8230         unsigned long flags = 0;
8231         unsigned int i;
8232         int ret = 0;
8233
8234         if (sp->how == SP4_MACH_CRED) {
8235                 /* Print state protect result */
8236                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8237                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8238                         if (test_bit(i, sp->enforce.u.longs))
8239                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8240                         if (test_bit(i, sp->allow.u.longs))
8241                                 dfprintk(MOUNT, "  allow op %d\n", i);
8242                 }
8243
8244                 /* make sure nothing is on enforce list that isn't supported */
8245                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8246                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8247                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8248                                 ret = -EINVAL;
8249                                 goto out;
8250                         }
8251                 }
8252
8253                 /*
8254                  * Minimal mode - state operations are allowed to use machine
8255                  * credential.  Note this already happens by default, so the
8256                  * client doesn't have to do anything more than the negotiation.
8257                  *
8258                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8259                  *       we're already using the machine cred for exchange_id
8260                  *       and will never use a different cred.
8261                  */
8262                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8263                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8264                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8265                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8266                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8267                         dfprintk(MOUNT, "  minimal mode enabled\n");
8268                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8269                 } else {
8270                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8271                         ret = -EINVAL;
8272                         goto out;
8273                 }
8274
8275                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8276                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8277                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8278                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8279                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8280                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8281                 }
8282
8283                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8284                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8285                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8286                 }
8287
8288                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8289                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8290                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8291                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8292                 }
8293
8294                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8295                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8296                         dfprintk(MOUNT, "  stateid mode enabled\n");
8297                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8298                 }
8299
8300                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8301                         dfprintk(MOUNT, "  write mode enabled\n");
8302                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8303                 }
8304
8305                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8306                         dfprintk(MOUNT, "  commit mode enabled\n");
8307                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8308                 }
8309         }
8310 out:
8311         clp->cl_sp4_flags = flags;
8312         return ret;
8313 }
8314
8315 struct nfs41_exchange_id_data {
8316         struct nfs41_exchange_id_res res;
8317         struct nfs41_exchange_id_args args;
8318 };
8319
8320 static void nfs4_exchange_id_release(void *data)
8321 {
8322         struct nfs41_exchange_id_data *cdata =
8323                                         (struct nfs41_exchange_id_data *)data;
8324
8325         nfs_put_client(cdata->args.client);
8326         kfree(cdata->res.impl_id);
8327         kfree(cdata->res.server_scope);
8328         kfree(cdata->res.server_owner);
8329         kfree(cdata);
8330 }
8331
8332 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8333         .rpc_release = nfs4_exchange_id_release,
8334 };
8335
8336 /*
8337  * _nfs4_proc_exchange_id()
8338  *
8339  * Wrapper for EXCHANGE_ID operation.
8340  */
8341 static struct rpc_task *
8342 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8343                         u32 sp4_how, struct rpc_xprt *xprt)
8344 {
8345         struct rpc_message msg = {
8346                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8347                 .rpc_cred = cred,
8348         };
8349         struct rpc_task_setup task_setup_data = {
8350                 .rpc_client = clp->cl_rpcclient,
8351                 .callback_ops = &nfs4_exchange_id_call_ops,
8352                 .rpc_message = &msg,
8353                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8354         };
8355         struct nfs41_exchange_id_data *calldata;
8356         int status;
8357
8358         if (!refcount_inc_not_zero(&clp->cl_count))
8359                 return ERR_PTR(-EIO);
8360
8361         status = -ENOMEM;
8362         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8363         if (!calldata)
8364                 goto out;
8365
8366         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8367
8368         status = nfs4_init_uniform_client_string(clp);
8369         if (status)
8370                 goto out_calldata;
8371
8372         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8373                                                 GFP_NOFS);
8374         status = -ENOMEM;
8375         if (unlikely(calldata->res.server_owner == NULL))
8376                 goto out_calldata;
8377
8378         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8379                                         GFP_NOFS);
8380         if (unlikely(calldata->res.server_scope == NULL))
8381                 goto out_server_owner;
8382
8383         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8384         if (unlikely(calldata->res.impl_id == NULL))
8385                 goto out_server_scope;
8386
8387         switch (sp4_how) {
8388         case SP4_NONE:
8389                 calldata->args.state_protect.how = SP4_NONE;
8390                 break;
8391
8392         case SP4_MACH_CRED:
8393                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8394                 break;
8395
8396         default:
8397                 /* unsupported! */
8398                 WARN_ON_ONCE(1);
8399                 status = -EINVAL;
8400                 goto out_impl_id;
8401         }
8402         if (xprt) {
8403                 task_setup_data.rpc_xprt = xprt;
8404                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8405                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8406                                 sizeof(calldata->args.verifier.data));
8407         }
8408         calldata->args.client = clp;
8409         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8410         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8411 #ifdef CONFIG_NFS_V4_1_MIGRATION
8412         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8413 #endif
8414         msg.rpc_argp = &calldata->args;
8415         msg.rpc_resp = &calldata->res;
8416         task_setup_data.callback_data = calldata;
8417
8418         return rpc_run_task(&task_setup_data);
8419
8420 out_impl_id:
8421         kfree(calldata->res.impl_id);
8422 out_server_scope:
8423         kfree(calldata->res.server_scope);
8424 out_server_owner:
8425         kfree(calldata->res.server_owner);
8426 out_calldata:
8427         kfree(calldata);
8428 out:
8429         nfs_put_client(clp);
8430         return ERR_PTR(status);
8431 }
8432
8433 /*
8434  * _nfs4_proc_exchange_id()
8435  *
8436  * Wrapper for EXCHANGE_ID operation.
8437  */
8438 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8439                         u32 sp4_how)
8440 {
8441         struct rpc_task *task;
8442         struct nfs41_exchange_id_args *argp;
8443         struct nfs41_exchange_id_res *resp;
8444         unsigned long now = jiffies;
8445         int status;
8446
8447         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8448         if (IS_ERR(task))
8449                 return PTR_ERR(task);
8450
8451         argp = task->tk_msg.rpc_argp;
8452         resp = task->tk_msg.rpc_resp;
8453         status = task->tk_status;
8454         if (status  != 0)
8455                 goto out;
8456
8457         status = nfs4_check_cl_exchange_flags(resp->flags);
8458         if (status  != 0)
8459                 goto out;
8460
8461         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8462         if (status != 0)
8463                 goto out;
8464
8465         do_renew_lease(clp, now);
8466
8467         clp->cl_clientid = resp->clientid;
8468         clp->cl_exchange_flags = resp->flags;
8469         clp->cl_seqid = resp->seqid;
8470         /* Client ID is not confirmed */
8471         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8472                 clear_bit(NFS4_SESSION_ESTABLISHED,
8473                           &clp->cl_session->session_state);
8474
8475         if (clp->cl_serverscope != NULL &&
8476             !nfs41_same_server_scope(clp->cl_serverscope,
8477                                 resp->server_scope)) {
8478                 dprintk("%s: server_scope mismatch detected\n",
8479                         __func__);
8480                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8481         }
8482
8483         swap(clp->cl_serverowner, resp->server_owner);
8484         swap(clp->cl_serverscope, resp->server_scope);
8485         swap(clp->cl_implid, resp->impl_id);
8486
8487         /* Save the EXCHANGE_ID verifier session trunk tests */
8488         memcpy(clp->cl_confirm.data, argp->verifier.data,
8489                sizeof(clp->cl_confirm.data));
8490 out:
8491         trace_nfs4_exchange_id(clp, status);
8492         rpc_put_task(task);
8493         return status;
8494 }
8495
8496 /*
8497  * nfs4_proc_exchange_id()
8498  *
8499  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8500  *
8501  * Since the clientid has expired, all compounds using sessions
8502  * associated with the stale clientid will be returning
8503  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8504  * be in some phase of session reset.
8505  *
8506  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8507  */
8508 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8509 {
8510         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8511         int status;
8512
8513         /* try SP4_MACH_CRED if krb5i/p */
8514         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8515             authflavor == RPC_AUTH_GSS_KRB5P) {
8516                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8517                 if (!status)
8518                         return 0;
8519         }
8520
8521         /* try SP4_NONE */
8522         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8523 }
8524
8525 /**
8526  * nfs4_test_session_trunk
8527  *
8528  * This is an add_xprt_test() test function called from
8529  * rpc_clnt_setup_test_and_add_xprt.
8530  *
8531  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8532  * and is dereferrenced in nfs4_exchange_id_release
8533  *
8534  * Upon success, add the new transport to the rpc_clnt
8535  *
8536  * @clnt: struct rpc_clnt to get new transport
8537  * @xprt: the rpc_xprt to test
8538  * @data: call data for _nfs4_proc_exchange_id.
8539  */
8540 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8541                             void *data)
8542 {
8543         struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
8544         struct rpc_task *task;
8545         int status;
8546
8547         u32 sp4_how;
8548
8549         dprintk("--> %s try %s\n", __func__,
8550                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8551
8552         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8553
8554         /* Test connection for session trunking. Async exchange_id call */
8555         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8556         if (IS_ERR(task))
8557                 return;
8558
8559         status = task->tk_status;
8560         if (status == 0)
8561                 status = nfs4_detect_session_trunking(adata->clp,
8562                                 task->tk_msg.rpc_resp, xprt);
8563
8564         if (status == 0)
8565                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8566
8567         rpc_put_task(task);
8568 }
8569 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8570
8571 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8572                 const struct cred *cred)
8573 {
8574         struct rpc_message msg = {
8575                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8576                 .rpc_argp = clp,
8577                 .rpc_cred = cred,
8578         };
8579         int status;
8580
8581         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8582                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8583         trace_nfs4_destroy_clientid(clp, status);
8584         if (status)
8585                 dprintk("NFS: Got error %d from the server %s on "
8586                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8587         return status;
8588 }
8589
8590 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8591                 const struct cred *cred)
8592 {
8593         unsigned int loop;
8594         int ret;
8595
8596         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8597                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8598                 switch (ret) {
8599                 case -NFS4ERR_DELAY:
8600                 case -NFS4ERR_CLIENTID_BUSY:
8601                         ssleep(1);
8602                         break;
8603                 default:
8604                         return ret;
8605                 }
8606         }
8607         return 0;
8608 }
8609
8610 int nfs4_destroy_clientid(struct nfs_client *clp)
8611 {
8612         const struct cred *cred;
8613         int ret = 0;
8614
8615         if (clp->cl_mvops->minor_version < 1)
8616                 goto out;
8617         if (clp->cl_exchange_flags == 0)
8618                 goto out;
8619         if (clp->cl_preserve_clid)
8620                 goto out;
8621         cred = nfs4_get_clid_cred(clp);
8622         ret = nfs4_proc_destroy_clientid(clp, cred);
8623         put_cred(cred);
8624         switch (ret) {
8625         case 0:
8626         case -NFS4ERR_STALE_CLIENTID:
8627                 clp->cl_exchange_flags = 0;
8628         }
8629 out:
8630         return ret;
8631 }
8632
8633 #endif /* CONFIG_NFS_V4_1 */
8634
8635 struct nfs4_get_lease_time_data {
8636         struct nfs4_get_lease_time_args *args;
8637         struct nfs4_get_lease_time_res *res;
8638         struct nfs_client *clp;
8639 };
8640
8641 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
8642                                         void *calldata)
8643 {
8644         struct nfs4_get_lease_time_data *data =
8645                         (struct nfs4_get_lease_time_data *)calldata;
8646
8647         dprintk("--> %s\n", __func__);
8648         /* just setup sequence, do not trigger session recovery
8649            since we're invoked within one */
8650         nfs4_setup_sequence(data->clp,
8651                         &data->args->la_seq_args,
8652                         &data->res->lr_seq_res,
8653                         task);
8654         dprintk("<-- %s\n", __func__);
8655 }
8656
8657 /*
8658  * Called from nfs4_state_manager thread for session setup, so don't recover
8659  * from sequence operation or clientid errors.
8660  */
8661 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
8662 {
8663         struct nfs4_get_lease_time_data *data =
8664                         (struct nfs4_get_lease_time_data *)calldata;
8665
8666         dprintk("--> %s\n", __func__);
8667         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
8668                 return;
8669         switch (task->tk_status) {
8670         case -NFS4ERR_DELAY:
8671         case -NFS4ERR_GRACE:
8672                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
8673                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
8674                 task->tk_status = 0;
8675                 fallthrough;
8676         case -NFS4ERR_RETRY_UNCACHED_REP:
8677                 rpc_restart_call_prepare(task);
8678                 return;
8679         }
8680         dprintk("<-- %s\n", __func__);
8681 }
8682
8683 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
8684         .rpc_call_prepare = nfs4_get_lease_time_prepare,
8685         .rpc_call_done = nfs4_get_lease_time_done,
8686 };
8687
8688 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
8689 {
8690         struct nfs4_get_lease_time_args args;
8691         struct nfs4_get_lease_time_res res = {
8692                 .lr_fsinfo = fsinfo,
8693         };
8694         struct nfs4_get_lease_time_data data = {
8695                 .args = &args,
8696                 .res = &res,
8697                 .clp = clp,
8698         };
8699         struct rpc_message msg = {
8700                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
8701                 .rpc_argp = &args,
8702                 .rpc_resp = &res,
8703         };
8704         struct rpc_task_setup task_setup = {
8705                 .rpc_client = clp->cl_rpcclient,
8706                 .rpc_message = &msg,
8707                 .callback_ops = &nfs4_get_lease_time_ops,
8708                 .callback_data = &data,
8709                 .flags = RPC_TASK_TIMEOUT,
8710         };
8711
8712         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
8713         return nfs4_call_sync_custom(&task_setup);
8714 }
8715
8716 #ifdef CONFIG_NFS_V4_1
8717
8718 /*
8719  * Initialize the values to be used by the client in CREATE_SESSION
8720  * If nfs4_init_session set the fore channel request and response sizes,
8721  * use them.
8722  *
8723  * Set the back channel max_resp_sz_cached to zero to force the client to
8724  * always set csa_cachethis to FALSE because the current implementation
8725  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
8726  */
8727 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
8728                                     struct rpc_clnt *clnt)
8729 {
8730         unsigned int max_rqst_sz, max_resp_sz;
8731         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
8732         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
8733
8734         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
8735         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
8736
8737         /* Fore channel attributes */
8738         args->fc_attrs.max_rqst_sz = max_rqst_sz;
8739         args->fc_attrs.max_resp_sz = max_resp_sz;
8740         args->fc_attrs.max_ops = NFS4_MAX_OPS;
8741         args->fc_attrs.max_reqs = max_session_slots;
8742
8743         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
8744                 "max_ops=%u max_reqs=%u\n",
8745                 __func__,
8746                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
8747                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
8748
8749         /* Back channel attributes */
8750         args->bc_attrs.max_rqst_sz = max_bc_payload;
8751         args->bc_attrs.max_resp_sz = max_bc_payload;
8752         args->bc_attrs.max_resp_sz_cached = 0;
8753         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
8754         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
8755         if (args->bc_attrs.max_reqs > max_bc_slots)
8756                 args->bc_attrs.max_reqs = max_bc_slots;
8757
8758         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
8759                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
8760                 __func__,
8761                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
8762                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
8763                 args->bc_attrs.max_reqs);
8764 }
8765
8766 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
8767                 struct nfs41_create_session_res *res)
8768 {
8769         struct nfs4_channel_attrs *sent = &args->fc_attrs;
8770         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
8771
8772         if (rcvd->max_resp_sz > sent->max_resp_sz)
8773                 return -EINVAL;
8774         /*
8775          * Our requested max_ops is the minimum we need; we're not
8776          * prepared to break up compounds into smaller pieces than that.
8777          * So, no point even trying to continue if the server won't
8778          * cooperate:
8779          */
8780         if (rcvd->max_ops < sent->max_ops)
8781                 return -EINVAL;
8782         if (rcvd->max_reqs == 0)
8783                 return -EINVAL;
8784         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
8785                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
8786         return 0;
8787 }
8788
8789 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
8790                 struct nfs41_create_session_res *res)
8791 {
8792         struct nfs4_channel_attrs *sent = &args->bc_attrs;
8793         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
8794
8795         if (!(res->flags & SESSION4_BACK_CHAN))
8796                 goto out;
8797         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
8798                 return -EINVAL;
8799         if (rcvd->max_resp_sz < sent->max_resp_sz)
8800                 return -EINVAL;
8801         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
8802                 return -EINVAL;
8803         if (rcvd->max_ops > sent->max_ops)
8804                 return -EINVAL;
8805         if (rcvd->max_reqs > sent->max_reqs)
8806                 return -EINVAL;
8807 out:
8808         return 0;
8809 }
8810
8811 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
8812                                      struct nfs41_create_session_res *res)
8813 {
8814         int ret;
8815
8816         ret = nfs4_verify_fore_channel_attrs(args, res);
8817         if (ret)
8818                 return ret;
8819         return nfs4_verify_back_channel_attrs(args, res);
8820 }
8821
8822 static void nfs4_update_session(struct nfs4_session *session,
8823                 struct nfs41_create_session_res *res)
8824 {
8825         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
8826         /* Mark client id and session as being confirmed */
8827         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
8828         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
8829         session->flags = res->flags;
8830         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
8831         if (res->flags & SESSION4_BACK_CHAN)
8832                 memcpy(&session->bc_attrs, &res->bc_attrs,
8833                                 sizeof(session->bc_attrs));
8834 }
8835
8836 static int _nfs4_proc_create_session(struct nfs_client *clp,
8837                 const struct cred *cred)
8838 {
8839         struct nfs4_session *session = clp->cl_session;
8840         struct nfs41_create_session_args args = {
8841                 .client = clp,
8842                 .clientid = clp->cl_clientid,
8843                 .seqid = clp->cl_seqid,
8844                 .cb_program = NFS4_CALLBACK,
8845         };
8846         struct nfs41_create_session_res res;
8847
8848         struct rpc_message msg = {
8849                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
8850                 .rpc_argp = &args,
8851                 .rpc_resp = &res,
8852                 .rpc_cred = cred,
8853         };
8854         int status;
8855
8856         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
8857         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
8858
8859         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8860                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8861         trace_nfs4_create_session(clp, status);
8862
8863         switch (status) {
8864         case -NFS4ERR_STALE_CLIENTID:
8865         case -NFS4ERR_DELAY:
8866         case -ETIMEDOUT:
8867         case -EACCES:
8868         case -EAGAIN:
8869                 goto out;
8870         }
8871
8872         clp->cl_seqid++;
8873         if (!status) {
8874                 /* Verify the session's negotiated channel_attrs values */
8875                 status = nfs4_verify_channel_attrs(&args, &res);
8876                 /* Increment the clientid slot sequence id */
8877                 if (status)
8878                         goto out;
8879                 nfs4_update_session(session, &res);
8880         }
8881 out:
8882         return status;
8883 }
8884
8885 /*
8886  * Issues a CREATE_SESSION operation to the server.
8887  * It is the responsibility of the caller to verify the session is
8888  * expired before calling this routine.
8889  */
8890 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
8891 {
8892         int status;
8893         unsigned *ptr;
8894         struct nfs4_session *session = clp->cl_session;
8895
8896         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
8897
8898         status = _nfs4_proc_create_session(clp, cred);
8899         if (status)
8900                 goto out;
8901
8902         /* Init or reset the session slot tables */
8903         status = nfs4_setup_session_slot_tables(session);
8904         dprintk("slot table setup returned %d\n", status);
8905         if (status)
8906                 goto out;
8907
8908         ptr = (unsigned *)&session->sess_id.data[0];
8909         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
8910                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
8911 out:
8912         dprintk("<-- %s\n", __func__);
8913         return status;
8914 }
8915
8916 /*
8917  * Issue the over-the-wire RPC DESTROY_SESSION.
8918  * The caller must serialize access to this routine.
8919  */
8920 int nfs4_proc_destroy_session(struct nfs4_session *session,
8921                 const struct cred *cred)
8922 {
8923         struct rpc_message msg = {
8924                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
8925                 .rpc_argp = session,
8926                 .rpc_cred = cred,
8927         };
8928         int status = 0;
8929
8930         dprintk("--> nfs4_proc_destroy_session\n");
8931
8932         /* session is still being setup */
8933         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
8934                 return 0;
8935
8936         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8937                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8938         trace_nfs4_destroy_session(session->clp, status);
8939
8940         if (status)
8941                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
8942                         "Session has been destroyed regardless...\n", status);
8943
8944         dprintk("<-- nfs4_proc_destroy_session\n");
8945         return status;
8946 }
8947
8948 /*
8949  * Renew the cl_session lease.
8950  */
8951 struct nfs4_sequence_data {
8952         struct nfs_client *clp;
8953         struct nfs4_sequence_args args;
8954         struct nfs4_sequence_res res;
8955 };
8956
8957 static void nfs41_sequence_release(void *data)
8958 {
8959         struct nfs4_sequence_data *calldata = data;
8960         struct nfs_client *clp = calldata->clp;
8961
8962         if (refcount_read(&clp->cl_count) > 1)
8963                 nfs4_schedule_state_renewal(clp);
8964         nfs_put_client(clp);
8965         kfree(calldata);
8966 }
8967
8968 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8969 {
8970         switch(task->tk_status) {
8971         case -NFS4ERR_DELAY:
8972                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8973                 return -EAGAIN;
8974         default:
8975                 nfs4_schedule_lease_recovery(clp);
8976         }
8977         return 0;
8978 }
8979
8980 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
8981 {
8982         struct nfs4_sequence_data *calldata = data;
8983         struct nfs_client *clp = calldata->clp;
8984
8985         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
8986                 return;
8987
8988         trace_nfs4_sequence(clp, task->tk_status);
8989         if (task->tk_status < 0) {
8990                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
8991                 if (refcount_read(&clp->cl_count) == 1)
8992                         goto out;
8993
8994                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
8995                         rpc_restart_call_prepare(task);
8996                         return;
8997                 }
8998         }
8999         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9000 out:
9001         dprintk("<-- %s\n", __func__);
9002 }
9003
9004 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9005 {
9006         struct nfs4_sequence_data *calldata = data;
9007         struct nfs_client *clp = calldata->clp;
9008         struct nfs4_sequence_args *args;
9009         struct nfs4_sequence_res *res;
9010
9011         args = task->tk_msg.rpc_argp;
9012         res = task->tk_msg.rpc_resp;
9013
9014         nfs4_setup_sequence(clp, args, res, task);
9015 }
9016
9017 static const struct rpc_call_ops nfs41_sequence_ops = {
9018         .rpc_call_done = nfs41_sequence_call_done,
9019         .rpc_call_prepare = nfs41_sequence_prepare,
9020         .rpc_release = nfs41_sequence_release,
9021 };
9022
9023 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9024                 const struct cred *cred,
9025                 struct nfs4_slot *slot,
9026                 bool is_privileged)
9027 {
9028         struct nfs4_sequence_data *calldata;
9029         struct rpc_message msg = {
9030                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9031                 .rpc_cred = cred,
9032         };
9033         struct rpc_task_setup task_setup_data = {
9034                 .rpc_client = clp->cl_rpcclient,
9035                 .rpc_message = &msg,
9036                 .callback_ops = &nfs41_sequence_ops,
9037                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
9038         };
9039         struct rpc_task *ret;
9040
9041         ret = ERR_PTR(-EIO);
9042         if (!refcount_inc_not_zero(&clp->cl_count))
9043                 goto out_err;
9044
9045         ret = ERR_PTR(-ENOMEM);
9046         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9047         if (calldata == NULL)
9048                 goto out_put_clp;
9049         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9050         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9051         msg.rpc_argp = &calldata->args;
9052         msg.rpc_resp = &calldata->res;
9053         calldata->clp = clp;
9054         task_setup_data.callback_data = calldata;
9055
9056         ret = rpc_run_task(&task_setup_data);
9057         if (IS_ERR(ret))
9058                 goto out_err;
9059         return ret;
9060 out_put_clp:
9061         nfs_put_client(clp);
9062 out_err:
9063         nfs41_release_slot(slot);
9064         return ret;
9065 }
9066
9067 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9068 {
9069         struct rpc_task *task;
9070         int ret = 0;
9071
9072         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9073                 return -EAGAIN;
9074         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9075         if (IS_ERR(task))
9076                 ret = PTR_ERR(task);
9077         else
9078                 rpc_put_task_async(task);
9079         dprintk("<-- %s status=%d\n", __func__, ret);
9080         return ret;
9081 }
9082
9083 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9084 {
9085         struct rpc_task *task;
9086         int ret;
9087
9088         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9089         if (IS_ERR(task)) {
9090                 ret = PTR_ERR(task);
9091                 goto out;
9092         }
9093         ret = rpc_wait_for_completion_task(task);
9094         if (!ret)
9095                 ret = task->tk_status;
9096         rpc_put_task(task);
9097 out:
9098         dprintk("<-- %s status=%d\n", __func__, ret);
9099         return ret;
9100 }
9101
9102 struct nfs4_reclaim_complete_data {
9103         struct nfs_client *clp;
9104         struct nfs41_reclaim_complete_args arg;
9105         struct nfs41_reclaim_complete_res res;
9106 };
9107
9108 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9109 {
9110         struct nfs4_reclaim_complete_data *calldata = data;
9111
9112         nfs4_setup_sequence(calldata->clp,
9113                         &calldata->arg.seq_args,
9114                         &calldata->res.seq_res,
9115                         task);
9116 }
9117
9118 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9119 {
9120         switch(task->tk_status) {
9121         case 0:
9122                 wake_up_all(&clp->cl_lock_waitq);
9123                 fallthrough;
9124         case -NFS4ERR_COMPLETE_ALREADY:
9125         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9126                 break;
9127         case -NFS4ERR_DELAY:
9128                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9129                 fallthrough;
9130         case -NFS4ERR_RETRY_UNCACHED_REP:
9131                 return -EAGAIN;
9132         case -NFS4ERR_BADSESSION:
9133         case -NFS4ERR_DEADSESSION:
9134         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9135                 break;
9136         default:
9137                 nfs4_schedule_lease_recovery(clp);
9138         }
9139         return 0;
9140 }
9141
9142 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9143 {
9144         struct nfs4_reclaim_complete_data *calldata = data;
9145         struct nfs_client *clp = calldata->clp;
9146         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9147
9148         dprintk("--> %s\n", __func__);
9149         if (!nfs41_sequence_done(task, res))
9150                 return;
9151
9152         trace_nfs4_reclaim_complete(clp, task->tk_status);
9153         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9154                 rpc_restart_call_prepare(task);
9155                 return;
9156         }
9157         dprintk("<-- %s\n", __func__);
9158 }
9159
9160 static void nfs4_free_reclaim_complete_data(void *data)
9161 {
9162         struct nfs4_reclaim_complete_data *calldata = data;
9163
9164         kfree(calldata);
9165 }
9166
9167 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9168         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9169         .rpc_call_done = nfs4_reclaim_complete_done,
9170         .rpc_release = nfs4_free_reclaim_complete_data,
9171 };
9172
9173 /*
9174  * Issue a global reclaim complete.
9175  */
9176 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9177                 const struct cred *cred)
9178 {
9179         struct nfs4_reclaim_complete_data *calldata;
9180         struct rpc_message msg = {
9181                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9182                 .rpc_cred = cred,
9183         };
9184         struct rpc_task_setup task_setup_data = {
9185                 .rpc_client = clp->cl_rpcclient,
9186                 .rpc_message = &msg,
9187                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9188                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9189         };
9190         int status = -ENOMEM;
9191
9192         dprintk("--> %s\n", __func__);
9193         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9194         if (calldata == NULL)
9195                 goto out;
9196         calldata->clp = clp;
9197         calldata->arg.one_fs = 0;
9198
9199         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9200         msg.rpc_argp = &calldata->arg;
9201         msg.rpc_resp = &calldata->res;
9202         task_setup_data.callback_data = calldata;
9203         status = nfs4_call_sync_custom(&task_setup_data);
9204 out:
9205         dprintk("<-- %s status=%d\n", __func__, status);
9206         return status;
9207 }
9208
9209 static void
9210 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9211 {
9212         struct nfs4_layoutget *lgp = calldata;
9213         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9214
9215         dprintk("--> %s\n", __func__);
9216         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9217                                 &lgp->res.seq_res, task);
9218         dprintk("<-- %s\n", __func__);
9219 }
9220
9221 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9222 {
9223         struct nfs4_layoutget *lgp = calldata;
9224
9225         dprintk("--> %s\n", __func__);
9226         nfs41_sequence_process(task, &lgp->res.seq_res);
9227         dprintk("<-- %s\n", __func__);
9228 }
9229
9230 static int
9231 nfs4_layoutget_handle_exception(struct rpc_task *task,
9232                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9233 {
9234         struct inode *inode = lgp->args.inode;
9235         struct nfs_server *server = NFS_SERVER(inode);
9236         struct pnfs_layout_hdr *lo;
9237         int nfs4err = task->tk_status;
9238         int err, status = 0;
9239         LIST_HEAD(head);
9240
9241         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9242
9243         nfs4_sequence_free_slot(&lgp->res.seq_res);
9244
9245         switch (nfs4err) {
9246         case 0:
9247                 goto out;
9248
9249         /*
9250          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9251          * on the file. set tk_status to -ENODATA to tell upper layer to
9252          * retry go inband.
9253          */
9254         case -NFS4ERR_LAYOUTUNAVAILABLE:
9255                 status = -ENODATA;
9256                 goto out;
9257         /*
9258          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9259          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9260          */
9261         case -NFS4ERR_BADLAYOUT:
9262                 status = -EOVERFLOW;
9263                 goto out;
9264         /*
9265          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9266          * (or clients) writing to the same RAID stripe except when
9267          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9268          *
9269          * Treat it like we would RECALLCONFLICT -- we retry for a little
9270          * while, and then eventually give up.
9271          */
9272         case -NFS4ERR_LAYOUTTRYLATER:
9273                 if (lgp->args.minlength == 0) {
9274                         status = -EOVERFLOW;
9275                         goto out;
9276                 }
9277                 status = -EBUSY;
9278                 break;
9279         case -NFS4ERR_RECALLCONFLICT:
9280                 status = -ERECALLCONFLICT;
9281                 break;
9282         case -NFS4ERR_DELEG_REVOKED:
9283         case -NFS4ERR_ADMIN_REVOKED:
9284         case -NFS4ERR_EXPIRED:
9285         case -NFS4ERR_BAD_STATEID:
9286                 exception->timeout = 0;
9287                 spin_lock(&inode->i_lock);
9288                 lo = NFS_I(inode)->layout;
9289                 /* If the open stateid was bad, then recover it. */
9290                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9291                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9292                         spin_unlock(&inode->i_lock);
9293                         exception->state = lgp->args.ctx->state;
9294                         exception->stateid = &lgp->args.stateid;
9295                         break;
9296                 }
9297
9298                 /*
9299                  * Mark the bad layout state as invalid, then retry
9300                  */
9301                 pnfs_mark_layout_stateid_invalid(lo, &head);
9302                 spin_unlock(&inode->i_lock);
9303                 nfs_commit_inode(inode, 0);
9304                 pnfs_free_lseg_list(&head);
9305                 status = -EAGAIN;
9306                 goto out;
9307         }
9308
9309         err = nfs4_handle_exception(server, nfs4err, exception);
9310         if (!status) {
9311                 if (exception->retry)
9312                         status = -EAGAIN;
9313                 else
9314                         status = err;
9315         }
9316 out:
9317         dprintk("<-- %s\n", __func__);
9318         return status;
9319 }
9320
9321 size_t max_response_pages(struct nfs_server *server)
9322 {
9323         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9324         return nfs_page_array_len(0, max_resp_sz);
9325 }
9326
9327 static void nfs4_layoutget_release(void *calldata)
9328 {
9329         struct nfs4_layoutget *lgp = calldata;
9330
9331         dprintk("--> %s\n", __func__);
9332         nfs4_sequence_free_slot(&lgp->res.seq_res);
9333         pnfs_layoutget_free(lgp);
9334         dprintk("<-- %s\n", __func__);
9335 }
9336
9337 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9338         .rpc_call_prepare = nfs4_layoutget_prepare,
9339         .rpc_call_done = nfs4_layoutget_done,
9340         .rpc_release = nfs4_layoutget_release,
9341 };
9342
9343 struct pnfs_layout_segment *
9344 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9345 {
9346         struct inode *inode = lgp->args.inode;
9347         struct nfs_server *server = NFS_SERVER(inode);
9348         struct rpc_task *task;
9349         struct rpc_message msg = {
9350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9351                 .rpc_argp = &lgp->args,
9352                 .rpc_resp = &lgp->res,
9353                 .rpc_cred = lgp->cred,
9354         };
9355         struct rpc_task_setup task_setup_data = {
9356                 .rpc_client = server->client,
9357                 .rpc_message = &msg,
9358                 .callback_ops = &nfs4_layoutget_call_ops,
9359                 .callback_data = lgp,
9360                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
9361         };
9362         struct pnfs_layout_segment *lseg = NULL;
9363         struct nfs4_exception exception = {
9364                 .inode = inode,
9365                 .timeout = *timeout,
9366         };
9367         int status = 0;
9368
9369         dprintk("--> %s\n", __func__);
9370
9371         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
9372         pnfs_get_layout_hdr(NFS_I(inode)->layout);
9373
9374         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9375
9376         task = rpc_run_task(&task_setup_data);
9377
9378         status = rpc_wait_for_completion_task(task);
9379         if (status != 0)
9380                 goto out;
9381
9382         if (task->tk_status < 0) {
9383                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9384                 *timeout = exception.timeout;
9385         } else if (lgp->res.layoutp->len == 0) {
9386                 status = -EAGAIN;
9387                 *timeout = nfs4_update_delay(&exception.timeout);
9388         } else
9389                 lseg = pnfs_layout_process(lgp);
9390 out:
9391         trace_nfs4_layoutget(lgp->args.ctx,
9392                         &lgp->args.range,
9393                         &lgp->res.range,
9394                         &lgp->res.stateid,
9395                         status);
9396
9397         rpc_put_task(task);
9398         dprintk("<-- %s status=%d\n", __func__, status);
9399         if (status)
9400                 return ERR_PTR(status);
9401         return lseg;
9402 }
9403
9404 static void
9405 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9406 {
9407         struct nfs4_layoutreturn *lrp = calldata;
9408
9409         dprintk("--> %s\n", __func__);
9410         nfs4_setup_sequence(lrp->clp,
9411                         &lrp->args.seq_args,
9412                         &lrp->res.seq_res,
9413                         task);
9414         if (!pnfs_layout_is_valid(lrp->args.layout))
9415                 rpc_exit(task, 0);
9416 }
9417
9418 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9419 {
9420         struct nfs4_layoutreturn *lrp = calldata;
9421         struct nfs_server *server;
9422
9423         dprintk("--> %s\n", __func__);
9424
9425         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9426                 return;
9427
9428         /*
9429          * Was there an RPC level error? Assume the call succeeded,
9430          * and that we need to release the layout
9431          */
9432         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9433                 lrp->res.lrs_present = 0;
9434                 return;
9435         }
9436
9437         server = NFS_SERVER(lrp->args.inode);
9438         switch (task->tk_status) {
9439         case -NFS4ERR_OLD_STATEID:
9440                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9441                                         &lrp->args.range,
9442                                         lrp->args.inode))
9443                         goto out_restart;
9444                 fallthrough;
9445         default:
9446                 task->tk_status = 0;
9447                 fallthrough;
9448         case 0:
9449                 break;
9450         case -NFS4ERR_DELAY:
9451                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9452                         break;
9453                 goto out_restart;
9454         }
9455         dprintk("<-- %s\n", __func__);
9456         return;
9457 out_restart:
9458         task->tk_status = 0;
9459         nfs4_sequence_free_slot(&lrp->res.seq_res);
9460         rpc_restart_call_prepare(task);
9461 }
9462
9463 static void nfs4_layoutreturn_release(void *calldata)
9464 {
9465         struct nfs4_layoutreturn *lrp = calldata;
9466         struct pnfs_layout_hdr *lo = lrp->args.layout;
9467
9468         dprintk("--> %s\n", __func__);
9469         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9470                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9471         nfs4_sequence_free_slot(&lrp->res.seq_res);
9472         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9473                 lrp->ld_private.ops->free(&lrp->ld_private);
9474         pnfs_put_layout_hdr(lrp->args.layout);
9475         nfs_iput_and_deactive(lrp->inode);
9476         put_cred(lrp->cred);
9477         kfree(calldata);
9478         dprintk("<-- %s\n", __func__);
9479 }
9480
9481 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9482         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9483         .rpc_call_done = nfs4_layoutreturn_done,
9484         .rpc_release = nfs4_layoutreturn_release,
9485 };
9486
9487 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9488 {
9489         struct rpc_task *task;
9490         struct rpc_message msg = {
9491                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9492                 .rpc_argp = &lrp->args,
9493                 .rpc_resp = &lrp->res,
9494                 .rpc_cred = lrp->cred,
9495         };
9496         struct rpc_task_setup task_setup_data = {
9497                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9498                 .rpc_message = &msg,
9499                 .callback_ops = &nfs4_layoutreturn_call_ops,
9500                 .callback_data = lrp,
9501         };
9502         int status = 0;
9503
9504         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9505                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9506                         &task_setup_data.rpc_client, &msg);
9507
9508         dprintk("--> %s\n", __func__);
9509         if (!sync) {
9510                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9511                 if (!lrp->inode) {
9512                         nfs4_layoutreturn_release(lrp);
9513                         return -EAGAIN;
9514                 }
9515                 task_setup_data.flags |= RPC_TASK_ASYNC;
9516         }
9517         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0);
9518         task = rpc_run_task(&task_setup_data);
9519         if (IS_ERR(task))
9520                 return PTR_ERR(task);
9521         if (sync)
9522                 status = task->tk_status;
9523         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9524         dprintk("<-- %s status=%d\n", __func__, status);
9525         rpc_put_task(task);
9526         return status;
9527 }
9528
9529 static int
9530 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9531                 struct pnfs_device *pdev,
9532                 const struct cred *cred)
9533 {
9534         struct nfs4_getdeviceinfo_args args = {
9535                 .pdev = pdev,
9536                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9537                         NOTIFY_DEVICEID4_DELETE,
9538         };
9539         struct nfs4_getdeviceinfo_res res = {
9540                 .pdev = pdev,
9541         };
9542         struct rpc_message msg = {
9543                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9544                 .rpc_argp = &args,
9545                 .rpc_resp = &res,
9546                 .rpc_cred = cred,
9547         };
9548         int status;
9549
9550         dprintk("--> %s\n", __func__);
9551         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9552         if (res.notification & ~args.notify_types)
9553                 dprintk("%s: unsupported notification\n", __func__);
9554         if (res.notification != args.notify_types)
9555                 pdev->nocache = 1;
9556
9557         dprintk("<-- %s status=%d\n", __func__, status);
9558
9559         return status;
9560 }
9561
9562 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9563                 struct pnfs_device *pdev,
9564                 const struct cred *cred)
9565 {
9566         struct nfs4_exception exception = { };
9567         int err;
9568
9569         do {
9570                 err = nfs4_handle_exception(server,
9571                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9572                                         &exception);
9573         } while (exception.retry);
9574         return err;
9575 }
9576 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9577
9578 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9579 {
9580         struct nfs4_layoutcommit_data *data = calldata;
9581         struct nfs_server *server = NFS_SERVER(data->args.inode);
9582
9583         nfs4_setup_sequence(server->nfs_client,
9584                         &data->args.seq_args,
9585                         &data->res.seq_res,
9586                         task);
9587 }
9588
9589 static void
9590 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9591 {
9592         struct nfs4_layoutcommit_data *data = calldata;
9593         struct nfs_server *server = NFS_SERVER(data->args.inode);
9594
9595         if (!nfs41_sequence_done(task, &data->res.seq_res))
9596                 return;
9597
9598         switch (task->tk_status) { /* Just ignore these failures */
9599         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9600         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9601         case -NFS4ERR_BADLAYOUT:     /* no layout */
9602         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9603                 task->tk_status = 0;
9604         case 0:
9605                 break;
9606         default:
9607                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9608                         rpc_restart_call_prepare(task);
9609                         return;
9610                 }
9611         }
9612 }
9613
9614 static void nfs4_layoutcommit_release(void *calldata)
9615 {
9616         struct nfs4_layoutcommit_data *data = calldata;
9617
9618         pnfs_cleanup_layoutcommit(data);
9619         nfs_post_op_update_inode_force_wcc(data->args.inode,
9620                                            data->res.fattr);
9621         put_cred(data->cred);
9622         nfs_iput_and_deactive(data->inode);
9623         kfree(data);
9624 }
9625
9626 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9627         .rpc_call_prepare = nfs4_layoutcommit_prepare,
9628         .rpc_call_done = nfs4_layoutcommit_done,
9629         .rpc_release = nfs4_layoutcommit_release,
9630 };
9631
9632 int
9633 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9634 {
9635         struct rpc_message msg = {
9636                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9637                 .rpc_argp = &data->args,
9638                 .rpc_resp = &data->res,
9639                 .rpc_cred = data->cred,
9640         };
9641         struct rpc_task_setup task_setup_data = {
9642                 .task = &data->task,
9643                 .rpc_client = NFS_CLIENT(data->args.inode),
9644                 .rpc_message = &msg,
9645                 .callback_ops = &nfs4_layoutcommit_ops,
9646                 .callback_data = data,
9647         };
9648         struct rpc_task *task;
9649         int status = 0;
9650
9651         dprintk("NFS: initiating layoutcommit call. sync %d "
9652                 "lbw: %llu inode %lu\n", sync,
9653                 data->args.lastbytewritten,
9654                 data->args.inode->i_ino);
9655
9656         if (!sync) {
9657                 data->inode = nfs_igrab_and_active(data->args.inode);
9658                 if (data->inode == NULL) {
9659                         nfs4_layoutcommit_release(data);
9660                         return -EAGAIN;
9661                 }
9662                 task_setup_data.flags = RPC_TASK_ASYNC;
9663         }
9664         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
9665         task = rpc_run_task(&task_setup_data);
9666         if (IS_ERR(task))
9667                 return PTR_ERR(task);
9668         if (sync)
9669                 status = task->tk_status;
9670         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
9671         dprintk("%s: status %d\n", __func__, status);
9672         rpc_put_task(task);
9673         return status;
9674 }
9675
9676 /*
9677  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
9678  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
9679  */
9680 static int
9681 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9682                     struct nfs_fsinfo *info,
9683                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
9684 {
9685         struct nfs41_secinfo_no_name_args args = {
9686                 .style = SECINFO_STYLE_CURRENT_FH,
9687         };
9688         struct nfs4_secinfo_res res = {
9689                 .flavors = flavors,
9690         };
9691         struct rpc_message msg = {
9692                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
9693                 .rpc_argp = &args,
9694                 .rpc_resp = &res,
9695         };
9696         struct rpc_clnt *clnt = server->client;
9697         struct nfs4_call_sync_data data = {
9698                 .seq_server = server,
9699                 .seq_args = &args.seq_args,
9700                 .seq_res = &res.seq_res,
9701         };
9702         struct rpc_task_setup task_setup = {
9703                 .rpc_client = server->client,
9704                 .rpc_message = &msg,
9705                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
9706                 .callback_data = &data,
9707                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9708         };
9709         const struct cred *cred = NULL;
9710         int status;
9711
9712         if (use_integrity) {
9713                 clnt = server->nfs_client->cl_rpcclient;
9714                 task_setup.rpc_client = clnt;
9715
9716                 cred = nfs4_get_clid_cred(server->nfs_client);
9717                 msg.rpc_cred = cred;
9718         }
9719
9720         dprintk("--> %s\n", __func__);
9721         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
9722         status = nfs4_call_sync_custom(&task_setup);
9723         dprintk("<-- %s status=%d\n", __func__, status);
9724
9725         put_cred(cred);
9726
9727         return status;
9728 }
9729
9730 static int
9731 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9732                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
9733 {
9734         struct nfs4_exception exception = {
9735                 .interruptible = true,
9736         };
9737         int err;
9738         do {
9739                 /* first try using integrity protection */
9740                 err = -NFS4ERR_WRONGSEC;
9741
9742                 /* try to use integrity protection with machine cred */
9743                 if (_nfs4_is_integrity_protected(server->nfs_client))
9744                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9745                                                           flavors, true);
9746
9747                 /*
9748                  * if unable to use integrity protection, or SECINFO with
9749                  * integrity protection returns NFS4ERR_WRONGSEC (which is
9750                  * disallowed by spec, but exists in deployed servers) use
9751                  * the current filesystem's rpc_client and the user cred.
9752                  */
9753                 if (err == -NFS4ERR_WRONGSEC)
9754                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9755                                                           flavors, false);
9756
9757                 switch (err) {
9758                 case 0:
9759                 case -NFS4ERR_WRONGSEC:
9760                 case -ENOTSUPP:
9761                         goto out;
9762                 default:
9763                         err = nfs4_handle_exception(server, err, &exception);
9764                 }
9765         } while (exception.retry);
9766 out:
9767         return err;
9768 }
9769
9770 static int
9771 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
9772                     struct nfs_fsinfo *info)
9773 {
9774         int err;
9775         struct page *page;
9776         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
9777         struct nfs4_secinfo_flavors *flavors;
9778         struct nfs4_secinfo4 *secinfo;
9779         int i;
9780
9781         page = alloc_page(GFP_KERNEL);
9782         if (!page) {
9783                 err = -ENOMEM;
9784                 goto out;
9785         }
9786
9787         flavors = page_address(page);
9788         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
9789
9790         /*
9791          * Fall back on "guess and check" method if
9792          * the server doesn't support SECINFO_NO_NAME
9793          */
9794         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
9795                 err = nfs4_find_root_sec(server, fhandle, info);
9796                 goto out_freepage;
9797         }
9798         if (err)
9799                 goto out_freepage;
9800
9801         for (i = 0; i < flavors->num_flavors; i++) {
9802                 secinfo = &flavors->flavors[i];
9803
9804                 switch (secinfo->flavor) {
9805                 case RPC_AUTH_NULL:
9806                 case RPC_AUTH_UNIX:
9807                 case RPC_AUTH_GSS:
9808                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
9809                                         &secinfo->flavor_info);
9810                         break;
9811                 default:
9812                         flavor = RPC_AUTH_MAXFLAVOR;
9813                         break;
9814                 }
9815
9816                 if (!nfs_auth_info_match(&server->auth_info, flavor))
9817                         flavor = RPC_AUTH_MAXFLAVOR;
9818
9819                 if (flavor != RPC_AUTH_MAXFLAVOR) {
9820                         err = nfs4_lookup_root_sec(server, fhandle,
9821                                                    info, flavor);
9822                         if (!err)
9823                                 break;
9824                 }
9825         }
9826
9827         if (flavor == RPC_AUTH_MAXFLAVOR)
9828                 err = -EPERM;
9829
9830 out_freepage:
9831         put_page(page);
9832         if (err == -EACCES)
9833                 return -EPERM;
9834 out:
9835         return err;
9836 }
9837
9838 static int _nfs41_test_stateid(struct nfs_server *server,
9839                 nfs4_stateid *stateid,
9840                 const struct cred *cred)
9841 {
9842         int status;
9843         struct nfs41_test_stateid_args args = {
9844                 .stateid = stateid,
9845         };
9846         struct nfs41_test_stateid_res res;
9847         struct rpc_message msg = {
9848                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
9849                 .rpc_argp = &args,
9850                 .rpc_resp = &res,
9851                 .rpc_cred = cred,
9852         };
9853         struct rpc_clnt *rpc_client = server->client;
9854
9855         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9856                 &rpc_client, &msg);
9857
9858         dprintk("NFS call  test_stateid %p\n", stateid);
9859         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
9860         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
9861                         &args.seq_args, &res.seq_res);
9862         if (status != NFS_OK) {
9863                 dprintk("NFS reply test_stateid: failed, %d\n", status);
9864                 return status;
9865         }
9866         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
9867         return -res.status;
9868 }
9869
9870 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
9871                 int err, struct nfs4_exception *exception)
9872 {
9873         exception->retry = 0;
9874         switch(err) {
9875         case -NFS4ERR_DELAY:
9876         case -NFS4ERR_RETRY_UNCACHED_REP:
9877                 nfs4_handle_exception(server, err, exception);
9878                 break;
9879         case -NFS4ERR_BADSESSION:
9880         case -NFS4ERR_BADSLOT:
9881         case -NFS4ERR_BAD_HIGH_SLOT:
9882         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9883         case -NFS4ERR_DEADSESSION:
9884                 nfs4_do_handle_exception(server, err, exception);
9885         }
9886 }
9887
9888 /**
9889  * nfs41_test_stateid - perform a TEST_STATEID operation
9890  *
9891  * @server: server / transport on which to perform the operation
9892  * @stateid: state ID to test
9893  * @cred: credential
9894  *
9895  * Returns NFS_OK if the server recognizes that "stateid" is valid.
9896  * Otherwise a negative NFS4ERR value is returned if the operation
9897  * failed or the state ID is not currently valid.
9898  */
9899 static int nfs41_test_stateid(struct nfs_server *server,
9900                 nfs4_stateid *stateid,
9901                 const struct cred *cred)
9902 {
9903         struct nfs4_exception exception = {
9904                 .interruptible = true,
9905         };
9906         int err;
9907         do {
9908                 err = _nfs41_test_stateid(server, stateid, cred);
9909                 nfs4_handle_delay_or_session_error(server, err, &exception);
9910         } while (exception.retry);
9911         return err;
9912 }
9913
9914 struct nfs_free_stateid_data {
9915         struct nfs_server *server;
9916         struct nfs41_free_stateid_args args;
9917         struct nfs41_free_stateid_res res;
9918 };
9919
9920 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
9921 {
9922         struct nfs_free_stateid_data *data = calldata;
9923         nfs4_setup_sequence(data->server->nfs_client,
9924                         &data->args.seq_args,
9925                         &data->res.seq_res,
9926                         task);
9927 }
9928
9929 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
9930 {
9931         struct nfs_free_stateid_data *data = calldata;
9932
9933         nfs41_sequence_done(task, &data->res.seq_res);
9934
9935         switch (task->tk_status) {
9936         case -NFS4ERR_DELAY:
9937                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
9938                         rpc_restart_call_prepare(task);
9939         }
9940 }
9941
9942 static void nfs41_free_stateid_release(void *calldata)
9943 {
9944         kfree(calldata);
9945 }
9946
9947 static const struct rpc_call_ops nfs41_free_stateid_ops = {
9948         .rpc_call_prepare = nfs41_free_stateid_prepare,
9949         .rpc_call_done = nfs41_free_stateid_done,
9950         .rpc_release = nfs41_free_stateid_release,
9951 };
9952
9953 /**
9954  * nfs41_free_stateid - perform a FREE_STATEID operation
9955  *
9956  * @server: server / transport on which to perform the operation
9957  * @stateid: state ID to release
9958  * @cred: credential
9959  * @privileged: set to true if this call needs to be privileged
9960  *
9961  * Note: this function is always asynchronous.
9962  */
9963 static int nfs41_free_stateid(struct nfs_server *server,
9964                 const nfs4_stateid *stateid,
9965                 const struct cred *cred,
9966                 bool privileged)
9967 {
9968         struct rpc_message msg = {
9969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
9970                 .rpc_cred = cred,
9971         };
9972         struct rpc_task_setup task_setup = {
9973                 .rpc_client = server->client,
9974                 .rpc_message = &msg,
9975                 .callback_ops = &nfs41_free_stateid_ops,
9976                 .flags = RPC_TASK_ASYNC,
9977         };
9978         struct nfs_free_stateid_data *data;
9979         struct rpc_task *task;
9980
9981         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9982                 &task_setup.rpc_client, &msg);
9983
9984         dprintk("NFS call  free_stateid %p\n", stateid);
9985         data = kmalloc(sizeof(*data), GFP_NOFS);
9986         if (!data)
9987                 return -ENOMEM;
9988         data->server = server;
9989         nfs4_stateid_copy(&data->args.stateid, stateid);
9990
9991         task_setup.callback_data = data;
9992
9993         msg.rpc_argp = &data->args;
9994         msg.rpc_resp = &data->res;
9995         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
9996         task = rpc_run_task(&task_setup);
9997         if (IS_ERR(task))
9998                 return PTR_ERR(task);
9999         rpc_put_task(task);
10000         return 0;
10001 }
10002
10003 static void
10004 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10005 {
10006         const struct cred *cred = lsp->ls_state->owner->so_cred;
10007
10008         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10009         nfs4_free_lock_state(server, lsp);
10010 }
10011
10012 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10013                 const nfs4_stateid *s2)
10014 {
10015         if (s1->type != s2->type)
10016                 return false;
10017
10018         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10019                 return false;
10020
10021         if (s1->seqid == s2->seqid)
10022                 return true;
10023
10024         return s1->seqid == 0 || s2->seqid == 0;
10025 }
10026
10027 #endif /* CONFIG_NFS_V4_1 */
10028
10029 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10030                 const nfs4_stateid *s2)
10031 {
10032         return nfs4_stateid_match(s1, s2);
10033 }
10034
10035
10036 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10037         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10038         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10039         .recover_open   = nfs4_open_reclaim,
10040         .recover_lock   = nfs4_lock_reclaim,
10041         .establish_clid = nfs4_init_clientid,
10042         .detect_trunking = nfs40_discover_server_trunking,
10043 };
10044
10045 #if defined(CONFIG_NFS_V4_1)
10046 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10047         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10048         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10049         .recover_open   = nfs4_open_reclaim,
10050         .recover_lock   = nfs4_lock_reclaim,
10051         .establish_clid = nfs41_init_clientid,
10052         .reclaim_complete = nfs41_proc_reclaim_complete,
10053         .detect_trunking = nfs41_discover_server_trunking,
10054 };
10055 #endif /* CONFIG_NFS_V4_1 */
10056
10057 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10058         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10059         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10060         .recover_open   = nfs40_open_expired,
10061         .recover_lock   = nfs4_lock_expired,
10062         .establish_clid = nfs4_init_clientid,
10063 };
10064
10065 #if defined(CONFIG_NFS_V4_1)
10066 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10067         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10068         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10069         .recover_open   = nfs41_open_expired,
10070         .recover_lock   = nfs41_lock_expired,
10071         .establish_clid = nfs41_init_clientid,
10072 };
10073 #endif /* CONFIG_NFS_V4_1 */
10074
10075 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10076         .sched_state_renewal = nfs4_proc_async_renew,
10077         .get_state_renewal_cred = nfs4_get_renew_cred,
10078         .renew_lease = nfs4_proc_renew,
10079 };
10080
10081 #if defined(CONFIG_NFS_V4_1)
10082 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10083         .sched_state_renewal = nfs41_proc_async_sequence,
10084         .get_state_renewal_cred = nfs4_get_machine_cred,
10085         .renew_lease = nfs4_proc_sequence,
10086 };
10087 #endif
10088
10089 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10090         .get_locations = _nfs40_proc_get_locations,
10091         .fsid_present = _nfs40_proc_fsid_present,
10092 };
10093
10094 #if defined(CONFIG_NFS_V4_1)
10095 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10096         .get_locations = _nfs41_proc_get_locations,
10097         .fsid_present = _nfs41_proc_fsid_present,
10098 };
10099 #endif  /* CONFIG_NFS_V4_1 */
10100
10101 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10102         .minor_version = 0,
10103         .init_caps = NFS_CAP_READDIRPLUS
10104                 | NFS_CAP_ATOMIC_OPEN
10105                 | NFS_CAP_POSIX_LOCK,
10106         .init_client = nfs40_init_client,
10107         .shutdown_client = nfs40_shutdown_client,
10108         .match_stateid = nfs4_match_stateid,
10109         .find_root_sec = nfs4_find_root_sec,
10110         .free_lock_state = nfs4_release_lockowner,
10111         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10112         .alloc_seqid = nfs_alloc_seqid,
10113         .call_sync_ops = &nfs40_call_sync_ops,
10114         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10115         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10116         .state_renewal_ops = &nfs40_state_renewal_ops,
10117         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10118 };
10119
10120 #if defined(CONFIG_NFS_V4_1)
10121 static struct nfs_seqid *
10122 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10123 {
10124         return NULL;
10125 }
10126
10127 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10128         .minor_version = 1,
10129         .init_caps = NFS_CAP_READDIRPLUS
10130                 | NFS_CAP_ATOMIC_OPEN
10131                 | NFS_CAP_POSIX_LOCK
10132                 | NFS_CAP_STATEID_NFSV41
10133                 | NFS_CAP_ATOMIC_OPEN_V1
10134                 | NFS_CAP_LGOPEN,
10135         .init_client = nfs41_init_client,
10136         .shutdown_client = nfs41_shutdown_client,
10137         .match_stateid = nfs41_match_stateid,
10138         .find_root_sec = nfs41_find_root_sec,
10139         .free_lock_state = nfs41_free_lock_state,
10140         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10141         .alloc_seqid = nfs_alloc_no_seqid,
10142         .session_trunk = nfs4_test_session_trunk,
10143         .call_sync_ops = &nfs41_call_sync_ops,
10144         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10145         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10146         .state_renewal_ops = &nfs41_state_renewal_ops,
10147         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10148 };
10149 #endif
10150
10151 #if defined(CONFIG_NFS_V4_2)
10152 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10153         .minor_version = 2,
10154         .init_caps = NFS_CAP_READDIRPLUS
10155                 | NFS_CAP_ATOMIC_OPEN
10156                 | NFS_CAP_POSIX_LOCK
10157                 | NFS_CAP_STATEID_NFSV41
10158                 | NFS_CAP_ATOMIC_OPEN_V1
10159                 | NFS_CAP_LGOPEN
10160                 | NFS_CAP_ALLOCATE
10161                 | NFS_CAP_COPY
10162                 | NFS_CAP_OFFLOAD_CANCEL
10163                 | NFS_CAP_COPY_NOTIFY
10164                 | NFS_CAP_DEALLOCATE
10165                 | NFS_CAP_SEEK
10166                 | NFS_CAP_LAYOUTSTATS
10167                 | NFS_CAP_CLONE
10168                 | NFS_CAP_LAYOUTERROR,
10169         .init_client = nfs41_init_client,
10170         .shutdown_client = nfs41_shutdown_client,
10171         .match_stateid = nfs41_match_stateid,
10172         .find_root_sec = nfs41_find_root_sec,
10173         .free_lock_state = nfs41_free_lock_state,
10174         .call_sync_ops = &nfs41_call_sync_ops,
10175         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10176         .alloc_seqid = nfs_alloc_no_seqid,
10177         .session_trunk = nfs4_test_session_trunk,
10178         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10179         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10180         .state_renewal_ops = &nfs41_state_renewal_ops,
10181         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10182 };
10183 #endif
10184
10185 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10186         [0] = &nfs_v4_0_minor_ops,
10187 #if defined(CONFIG_NFS_V4_1)
10188         [1] = &nfs_v4_1_minor_ops,
10189 #endif
10190 #if defined(CONFIG_NFS_V4_2)
10191         [2] = &nfs_v4_2_minor_ops,
10192 #endif
10193 };
10194
10195 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10196 {
10197         ssize_t error, error2, error3;
10198
10199         error = generic_listxattr(dentry, list, size);
10200         if (error < 0)
10201                 return error;
10202         if (list) {
10203                 list += error;
10204                 size -= error;
10205         }
10206
10207         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10208         if (error2 < 0)
10209                 return error2;
10210
10211         if (list) {
10212                 list += error2;
10213                 size -= error2;
10214         }
10215
10216         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10217         if (error3 < 0)
10218                 return error3;
10219
10220         return error + error2 + error3;
10221 }
10222
10223 static const struct inode_operations nfs4_dir_inode_operations = {
10224         .create         = nfs_create,
10225         .lookup         = nfs_lookup,
10226         .atomic_open    = nfs_atomic_open,
10227         .link           = nfs_link,
10228         .unlink         = nfs_unlink,
10229         .symlink        = nfs_symlink,
10230         .mkdir          = nfs_mkdir,
10231         .rmdir          = nfs_rmdir,
10232         .mknod          = nfs_mknod,
10233         .rename         = nfs_rename,
10234         .permission     = nfs_permission,
10235         .getattr        = nfs_getattr,
10236         .setattr        = nfs_setattr,
10237         .listxattr      = nfs4_listxattr,
10238 };
10239
10240 static const struct inode_operations nfs4_file_inode_operations = {
10241         .permission     = nfs_permission,
10242         .getattr        = nfs_getattr,
10243         .setattr        = nfs_setattr,
10244         .listxattr      = nfs4_listxattr,
10245 };
10246
10247 const struct nfs_rpc_ops nfs_v4_clientops = {
10248         .version        = 4,                    /* protocol version */
10249         .dentry_ops     = &nfs4_dentry_operations,
10250         .dir_inode_ops  = &nfs4_dir_inode_operations,
10251         .file_inode_ops = &nfs4_file_inode_operations,
10252         .file_ops       = &nfs4_file_operations,
10253         .getroot        = nfs4_proc_get_root,
10254         .submount       = nfs4_submount,
10255         .try_get_tree   = nfs4_try_get_tree,
10256         .getattr        = nfs4_proc_getattr,
10257         .setattr        = nfs4_proc_setattr,
10258         .lookup         = nfs4_proc_lookup,
10259         .lookupp        = nfs4_proc_lookupp,
10260         .access         = nfs4_proc_access,
10261         .readlink       = nfs4_proc_readlink,
10262         .create         = nfs4_proc_create,
10263         .remove         = nfs4_proc_remove,
10264         .unlink_setup   = nfs4_proc_unlink_setup,
10265         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10266         .unlink_done    = nfs4_proc_unlink_done,
10267         .rename_setup   = nfs4_proc_rename_setup,
10268         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10269         .rename_done    = nfs4_proc_rename_done,
10270         .link           = nfs4_proc_link,
10271         .symlink        = nfs4_proc_symlink,
10272         .mkdir          = nfs4_proc_mkdir,
10273         .rmdir          = nfs4_proc_rmdir,
10274         .readdir        = nfs4_proc_readdir,
10275         .mknod          = nfs4_proc_mknod,
10276         .statfs         = nfs4_proc_statfs,
10277         .fsinfo         = nfs4_proc_fsinfo,
10278         .pathconf       = nfs4_proc_pathconf,
10279         .set_capabilities = nfs4_server_capabilities,
10280         .decode_dirent  = nfs4_decode_dirent,
10281         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10282         .read_setup     = nfs4_proc_read_setup,
10283         .read_done      = nfs4_read_done,
10284         .write_setup    = nfs4_proc_write_setup,
10285         .write_done     = nfs4_write_done,
10286         .commit_setup   = nfs4_proc_commit_setup,
10287         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10288         .commit_done    = nfs4_commit_done,
10289         .lock           = nfs4_proc_lock,
10290         .clear_acl_cache = nfs4_zap_acl_attr,
10291         .close_context  = nfs4_close_context,
10292         .open_context   = nfs4_atomic_open,
10293         .have_delegation = nfs4_have_delegation,
10294         .alloc_client   = nfs4_alloc_client,
10295         .init_client    = nfs4_init_client,
10296         .free_client    = nfs4_free_client,
10297         .create_server  = nfs4_create_server,
10298         .clone_server   = nfs_clone_server,
10299 };
10300
10301 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10302         .name   = XATTR_NAME_NFSV4_ACL,
10303         .list   = nfs4_xattr_list_nfs4_acl,
10304         .get    = nfs4_xattr_get_nfs4_acl,
10305         .set    = nfs4_xattr_set_nfs4_acl,
10306 };
10307
10308 #ifdef CONFIG_NFS_V4_2
10309 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10310         .prefix = XATTR_USER_PREFIX,
10311         .get    = nfs4_xattr_get_nfs4_user,
10312         .set    = nfs4_xattr_set_nfs4_user,
10313 };
10314 #endif
10315
10316 const struct xattr_handler *nfs4_xattr_handlers[] = {
10317         &nfs4_xattr_nfs4_acl_handler,
10318 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10319         &nfs4_xattr_nfs4_label_handler,
10320 #endif
10321 #ifdef CONFIG_NFS_V4_2
10322         &nfs4_xattr_nfs4_user_handler,
10323 #endif
10324         NULL
10325 };
10326
10327 /*
10328  * Local variables:
10329  *  c-basic-offset: 8
10330  * End:
10331  */