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 <[email protected]>
  10  *  Andy Adamson   <[email protected]>
  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                         /* Fall through */
 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                         /* Fall through */
 538                 case -NFS4ERR_DELAY:
 539                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 540                         /* Fall through */
 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                 /* Fall through */
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                 /* Fall through */
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                 goto zero_stateid;
3298
3299         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3300                 /* Use that stateid */
3301         } else if (ctx != NULL && ctx->state) {
3302                 struct nfs_lock_context *l_ctx;
3303                 if (!nfs4_valid_open_stateid(ctx->state))
3304                         return -EBADF;
3305                 l_ctx = nfs_get_lock_context(ctx);
3306                 if (IS_ERR(l_ctx))
3307                         return PTR_ERR(l_ctx);
3308                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3309                                                 &arg->stateid, &delegation_cred);
3310                 nfs_put_lock_context(l_ctx);
3311                 if (status == -EIO)
3312                         return -EBADF;
3313                 else if (status == -EAGAIN)
3314                         goto zero_stateid;
3315         } else {
3316 zero_stateid:
3317                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3318         }
3319         if (delegation_cred)
3320                 msg.rpc_cred = delegation_cred;
3321
3322         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3323
3324         put_cred(delegation_cred);
3325         if (status == 0 && ctx != NULL)
3326                 renew_lease(server, timestamp);
3327         trace_nfs4_setattr(inode, &arg->stateid, status);
3328         return status;
3329 }
3330
3331 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3332                            struct nfs_fattr *fattr, struct iattr *sattr,
3333                            struct nfs_open_context *ctx, struct nfs4_label *ilabel,
3334                            struct nfs4_label *olabel)
3335 {
3336         struct nfs_server *server = NFS_SERVER(inode);
3337         __u32 bitmask[NFS4_BITMASK_SZ];
3338         struct nfs4_state *state = ctx ? ctx->state : NULL;
3339         struct nfs_setattrargs  arg = {
3340                 .fh             = NFS_FH(inode),
3341                 .iap            = sattr,
3342                 .server         = server,
3343                 .bitmask = bitmask,
3344                 .label          = ilabel,
3345         };
3346         struct nfs_setattrres  res = {
3347                 .fattr          = fattr,
3348                 .label          = olabel,
3349                 .server         = server,
3350         };
3351         struct nfs4_exception exception = {
3352                 .state = state,
3353                 .inode = inode,
3354                 .stateid = &arg.stateid,
3355         };
3356         int err;
3357
3358         do {
3359                 nfs4_bitmap_copy_adjust_setattr(bitmask,
3360                                 nfs4_bitmask(server, olabel),
3361                                 inode);
3362
3363                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3364                 switch (err) {
3365                 case -NFS4ERR_OPENMODE:
3366                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3367                                 pr_warn_once("NFSv4: server %s is incorrectly "
3368                                                 "applying open mode checks to "
3369                                                 "a SETATTR that is not "
3370                                                 "changing file size.\n",
3371                                                 server->nfs_client->cl_hostname);
3372                         }
3373                         if (state && !(state->state & FMODE_WRITE)) {
3374                                 err = -EBADF;
3375                                 if (sattr->ia_valid & ATTR_OPEN)
3376                                         err = -EACCES;
3377                                 goto out;
3378                         }
3379                 }
3380                 err = nfs4_handle_exception(server, err, &exception);
3381         } while (exception.retry);
3382 out:
3383         return err;
3384 }
3385
3386 static bool
3387 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3388 {
3389         if (inode == NULL || !nfs_have_layout(inode))
3390                 return false;
3391
3392         return pnfs_wait_on_layoutreturn(inode, task);
3393 }
3394
3395 /*
3396  * Update the seqid of an open stateid
3397  */
3398 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3399                 struct nfs4_state *state)
3400 {
3401         __be32 seqid_open;
3402         u32 dst_seqid;
3403         int seq;
3404
3405         for (;;) {
3406                 if (!nfs4_valid_open_stateid(state))
3407                         break;
3408                 seq = read_seqbegin(&state->seqlock);
3409                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3410                         nfs4_stateid_copy(dst, &state->open_stateid);
3411                         if (read_seqretry(&state->seqlock, seq))
3412                                 continue;
3413                         break;
3414                 }
3415                 seqid_open = state->open_stateid.seqid;
3416                 if (read_seqretry(&state->seqlock, seq))
3417                         continue;
3418
3419                 dst_seqid = be32_to_cpu(dst->seqid);
3420                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3421                         dst->seqid = seqid_open;
3422                 break;
3423         }
3424 }
3425
3426 /*
3427  * Update the seqid of an open stateid after receiving
3428  * NFS4ERR_OLD_STATEID
3429  */
3430 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3431                 struct nfs4_state *state)
3432 {
3433         __be32 seqid_open;
3434         u32 dst_seqid;
3435         bool ret;
3436         int seq;
3437
3438         for (;;) {
3439                 ret = false;
3440                 if (!nfs4_valid_open_stateid(state))
3441                         break;
3442                 seq = read_seqbegin(&state->seqlock);
3443                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3444                         if (read_seqretry(&state->seqlock, seq))
3445                                 continue;
3446                         break;
3447                 }
3448                 seqid_open = state->open_stateid.seqid;
3449                 if (read_seqretry(&state->seqlock, seq))
3450                         continue;
3451
3452                 dst_seqid = be32_to_cpu(dst->seqid);
3453                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) >= 0)
3454                         dst->seqid = cpu_to_be32(dst_seqid + 1);
3455                 else
3456                         dst->seqid = seqid_open;
3457                 ret = true;
3458                 break;
3459         }
3460
3461         return ret;
3462 }
3463
3464 struct nfs4_closedata {
3465         struct inode *inode;
3466         struct nfs4_state *state;
3467         struct nfs_closeargs arg;
3468         struct nfs_closeres res;
3469         struct {
3470                 struct nfs4_layoutreturn_args arg;
3471                 struct nfs4_layoutreturn_res res;
3472                 struct nfs4_xdr_opaque_data ld_private;
3473                 u32 roc_barrier;
3474                 bool roc;
3475         } lr;
3476         struct nfs_fattr fattr;
3477         unsigned long timestamp;
3478 };
3479
3480 static void nfs4_free_closedata(void *data)
3481 {
3482         struct nfs4_closedata *calldata = data;
3483         struct nfs4_state_owner *sp = calldata->state->owner;
3484         struct super_block *sb = calldata->state->inode->i_sb;
3485
3486         if (calldata->lr.roc)
3487                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3488                                 calldata->res.lr_ret);
3489         nfs4_put_open_state(calldata->state);
3490         nfs_free_seqid(calldata->arg.seqid);
3491         nfs4_put_state_owner(sp);
3492         nfs_sb_deactive(sb);
3493         kfree(calldata);
3494 }
3495
3496 static void nfs4_close_done(struct rpc_task *task, void *data)
3497 {
3498         struct nfs4_closedata *calldata = data;
3499         struct nfs4_state *state = calldata->state;
3500         struct nfs_server *server = NFS_SERVER(calldata->inode);
3501         nfs4_stateid *res_stateid = NULL;
3502         struct nfs4_exception exception = {
3503                 .state = state,
3504                 .inode = calldata->inode,
3505                 .stateid = &calldata->arg.stateid,
3506         };
3507
3508         dprintk("%s: begin!\n", __func__);
3509         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3510                 return;
3511         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3512
3513         /* Handle Layoutreturn errors */
3514         if (pnfs_roc_done(task, calldata->inode,
3515                                 &calldata->arg.lr_args,
3516                                 &calldata->res.lr_res,
3517                                 &calldata->res.lr_ret) == -EAGAIN)
3518                 goto out_restart;
3519
3520         /* hmm. we are done with the inode, and in the process of freeing
3521          * the state_owner. we keep this around to process errors
3522          */
3523         switch (task->tk_status) {
3524                 case 0:
3525                         res_stateid = &calldata->res.stateid;
3526                         renew_lease(server, calldata->timestamp);
3527                         break;
3528                 case -NFS4ERR_ACCESS:
3529                         if (calldata->arg.bitmask != NULL) {
3530                                 calldata->arg.bitmask = NULL;
3531                                 calldata->res.fattr = NULL;
3532                                 goto out_restart;
3533
3534                         }
3535                         break;
3536                 case -NFS4ERR_OLD_STATEID:
3537                         /* Did we race with OPEN? */
3538                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3539                                                 state))
3540                                 goto out_restart;
3541                         goto out_release;
3542                 case -NFS4ERR_ADMIN_REVOKED:
3543                 case -NFS4ERR_STALE_STATEID:
3544                 case -NFS4ERR_EXPIRED:
3545                         nfs4_free_revoked_stateid(server,
3546                                         &calldata->arg.stateid,
3547                                         task->tk_msg.rpc_cred);
3548                         /* Fallthrough */
3549                 case -NFS4ERR_BAD_STATEID:
3550                         if (calldata->arg.fmode == 0)
3551                                 break;
3552                         /* Fallthrough */
3553                 default:
3554                         task->tk_status = nfs4_async_handle_exception(task,
3555                                         server, task->tk_status, &exception);
3556                         if (exception.retry)
3557                                 goto out_restart;
3558         }
3559         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3560                         res_stateid, calldata->arg.fmode);
3561 out_release:
3562         task->tk_status = 0;
3563         nfs_release_seqid(calldata->arg.seqid);
3564         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3565         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3566         return;
3567 out_restart:
3568         task->tk_status = 0;
3569         rpc_restart_call_prepare(task);
3570         goto out_release;
3571 }
3572
3573 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3574 {
3575         struct nfs4_closedata *calldata = data;
3576         struct nfs4_state *state = calldata->state;
3577         struct inode *inode = calldata->inode;
3578         struct pnfs_layout_hdr *lo;
3579         bool is_rdonly, is_wronly, is_rdwr;
3580         int call_close = 0;
3581
3582         dprintk("%s: begin!\n", __func__);
3583         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3584                 goto out_wait;
3585
3586         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3587         spin_lock(&state->owner->so_lock);
3588         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3589         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3590         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3591         /* Calculate the change in open mode */
3592         calldata->arg.fmode = 0;
3593         if (state->n_rdwr == 0) {
3594                 if (state->n_rdonly == 0)
3595                         call_close |= is_rdonly;
3596                 else if (is_rdonly)
3597                         calldata->arg.fmode |= FMODE_READ;
3598                 if (state->n_wronly == 0)
3599                         call_close |= is_wronly;
3600                 else if (is_wronly)
3601                         calldata->arg.fmode |= FMODE_WRITE;
3602                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3603                         call_close |= is_rdwr;
3604         } else if (is_rdwr)
3605                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3606
3607         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3608         if (!nfs4_valid_open_stateid(state))
3609                 call_close = 0;
3610         spin_unlock(&state->owner->so_lock);
3611
3612         if (!call_close) {
3613                 /* Note: exit _without_ calling nfs4_close_done */
3614                 goto out_no_action;
3615         }
3616
3617         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3618                 nfs_release_seqid(calldata->arg.seqid);
3619                 goto out_wait;
3620         }
3621
3622         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3623         if (lo && !pnfs_layout_is_valid(lo)) {
3624                 calldata->arg.lr_args = NULL;
3625                 calldata->res.lr_res = NULL;
3626         }
3627
3628         if (calldata->arg.fmode == 0)
3629                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3630
3631         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3632                 /* Close-to-open cache consistency revalidation */
3633                 if (!nfs4_have_delegation(inode, FMODE_READ))
3634                         calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3635                 else
3636                         calldata->arg.bitmask = NULL;
3637         }
3638
3639         calldata->arg.share_access =
3640                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3641                                 calldata->arg.fmode, 0);
3642
3643         if (calldata->res.fattr == NULL)
3644                 calldata->arg.bitmask = NULL;
3645         else if (calldata->arg.bitmask == NULL)
3646                 calldata->res.fattr = NULL;
3647         calldata->timestamp = jiffies;
3648         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3649                                 &calldata->arg.seq_args,
3650                                 &calldata->res.seq_res,
3651                                 task) != 0)
3652                 nfs_release_seqid(calldata->arg.seqid);
3653         dprintk("%s: done!\n", __func__);
3654         return;
3655 out_no_action:
3656         task->tk_action = NULL;
3657 out_wait:
3658         nfs4_sequence_done(task, &calldata->res.seq_res);
3659 }
3660
3661 static const struct rpc_call_ops nfs4_close_ops = {
3662         .rpc_call_prepare = nfs4_close_prepare,
3663         .rpc_call_done = nfs4_close_done,
3664         .rpc_release = nfs4_free_closedata,
3665 };
3666
3667 /*
3668  * It is possible for data to be read/written from a mem-mapped file
3669  * after the sys_close call (which hits the vfs layer as a flush).
3670  * This means that we can't safely call nfsv4 close on a file until
3671  * the inode is cleared. This in turn means that we are not good
3672  * NFSv4 citizens - we do not indicate to the server to update the file's
3673  * share state even when we are done with one of the three share
3674  * stateid's in the inode.
3675  *
3676  * NOTE: Caller must be holding the sp->so_owner semaphore!
3677  */
3678 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3679 {
3680         struct nfs_server *server = NFS_SERVER(state->inode);
3681         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3682         struct nfs4_closedata *calldata;
3683         struct nfs4_state_owner *sp = state->owner;
3684         struct rpc_task *task;
3685         struct rpc_message msg = {
3686                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3687                 .rpc_cred = state->owner->so_cred,
3688         };
3689         struct rpc_task_setup task_setup_data = {
3690                 .rpc_client = server->client,
3691                 .rpc_message = &msg,
3692                 .callback_ops = &nfs4_close_ops,
3693                 .workqueue = nfsiod_workqueue,
3694                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3695         };
3696         int status = -ENOMEM;
3697
3698         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3699                 &task_setup_data.rpc_client, &msg);
3700
3701         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3702         if (calldata == NULL)
3703                 goto out;
3704         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3705         calldata->inode = state->inode;
3706         calldata->state = state;
3707         calldata->arg.fh = NFS_FH(state->inode);
3708         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3709                 goto out_free_calldata;
3710         /* Serialization for the sequence id */
3711         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3712         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3713         if (IS_ERR(calldata->arg.seqid))
3714                 goto out_free_calldata;
3715         nfs_fattr_init(&calldata->fattr);
3716         calldata->arg.fmode = 0;
3717         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3718         calldata->res.fattr = &calldata->fattr;
3719         calldata->res.seqid = calldata->arg.seqid;
3720         calldata->res.server = server;
3721         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3722         calldata->lr.roc = pnfs_roc(state->inode,
3723                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3724         if (calldata->lr.roc) {
3725                 calldata->arg.lr_args = &calldata->lr.arg;
3726                 calldata->res.lr_res = &calldata->lr.res;
3727         }
3728         nfs_sb_active(calldata->inode->i_sb);
3729
3730         msg.rpc_argp = &calldata->arg;
3731         msg.rpc_resp = &calldata->res;
3732         task_setup_data.callback_data = calldata;
3733         task = rpc_run_task(&task_setup_data);
3734         if (IS_ERR(task))
3735                 return PTR_ERR(task);
3736         status = 0;
3737         if (wait)
3738                 status = rpc_wait_for_completion_task(task);
3739         rpc_put_task(task);
3740         return status;
3741 out_free_calldata:
3742         kfree(calldata);
3743 out:
3744         nfs4_put_open_state(state);
3745         nfs4_put_state_owner(sp);
3746         return status;
3747 }
3748
3749 static struct inode *
3750 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3751                 int open_flags, struct iattr *attr, int *opened)
3752 {
3753         struct nfs4_state *state;
3754         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3755
3756         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3757
3758         /* Protect against concurrent sillydeletes */
3759         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3760
3761         nfs4_label_release_security(label);
3762
3763         if (IS_ERR(state))
3764                 return ERR_CAST(state);
3765         return state->inode;
3766 }
3767
3768 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3769 {
3770         if (ctx->state == NULL)
3771                 return;
3772         if (is_sync)
3773                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3774         else
3775                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3776 }
3777
3778 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3779 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3780 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3781
3782 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3783 {
3784         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3785         struct nfs4_server_caps_arg args = {
3786                 .fhandle = fhandle,
3787                 .bitmask = bitmask,
3788         };
3789         struct nfs4_server_caps_res res = {};
3790         struct rpc_message msg = {
3791                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3792                 .rpc_argp = &args,
3793                 .rpc_resp = &res,
3794         };
3795         int status;
3796         int i;
3797
3798         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3799                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3800                      FATTR4_WORD0_LINK_SUPPORT |
3801                      FATTR4_WORD0_SYMLINK_SUPPORT |
3802                      FATTR4_WORD0_ACLSUPPORT;
3803         if (minorversion)
3804                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3805
3806         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3807         if (status == 0) {
3808                 /* Sanity check the server answers */
3809                 switch (minorversion) {
3810                 case 0:
3811                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3812                         res.attr_bitmask[2] = 0;
3813                         break;
3814                 case 1:
3815                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3816                         break;
3817                 case 2:
3818                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3819                 }
3820                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3821                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3822                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3823                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3824                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3825                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3826                                 NFS_CAP_SECURITY_LABEL);
3827                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3828                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3829                         server->caps |= NFS_CAP_ACLS;
3830                 if (res.has_links != 0)
3831                         server->caps |= NFS_CAP_HARDLINKS;
3832                 if (res.has_symlinks != 0)
3833                         server->caps |= NFS_CAP_SYMLINKS;
3834                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3835                         server->caps |= NFS_CAP_FILEID;
3836                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3837                         server->caps |= NFS_CAP_MODE;
3838                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3839                         server->caps |= NFS_CAP_NLINK;
3840                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3841                         server->caps |= NFS_CAP_OWNER;
3842                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3843                         server->caps |= NFS_CAP_OWNER_GROUP;
3844                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3845                         server->caps |= NFS_CAP_ATIME;
3846                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3847                         server->caps |= NFS_CAP_CTIME;
3848                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3849                         server->caps |= NFS_CAP_MTIME;
3850 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3851                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3852                         server->caps |= NFS_CAP_SECURITY_LABEL;
3853 #endif
3854                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3855                                 sizeof(server->attr_bitmask));
3856                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3857
3858                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3859                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3860                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3861                 server->cache_consistency_bitmask[2] = 0;
3862
3863                 /* Avoid a regression due to buggy server */
3864                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3865                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3866                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3867                         sizeof(server->exclcreat_bitmask));
3868
3869                 server->acl_bitmask = res.acl_bitmask;
3870                 server->fh_expire_type = res.fh_expire_type;
3871         }
3872
3873         return status;
3874 }
3875
3876 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3877 {
3878         struct nfs4_exception exception = {
3879                 .interruptible = true,
3880         };
3881         int err;
3882         do {
3883                 err = nfs4_handle_exception(server,
3884                                 _nfs4_server_capabilities(server, fhandle),
3885                                 &exception);
3886         } while (exception.retry);
3887         return err;
3888 }
3889
3890 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3891                 struct nfs_fsinfo *info)
3892 {
3893         u32 bitmask[3];
3894         struct nfs4_lookup_root_arg args = {
3895                 .bitmask = bitmask,
3896         };
3897         struct nfs4_lookup_res res = {
3898                 .server = server,
3899                 .fattr = info->fattr,
3900                 .fh = fhandle,
3901         };
3902         struct rpc_message msg = {
3903                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3904                 .rpc_argp = &args,
3905                 .rpc_resp = &res,
3906         };
3907
3908         bitmask[0] = nfs4_fattr_bitmap[0];
3909         bitmask[1] = nfs4_fattr_bitmap[1];
3910         /*
3911          * Process the label in the upcoming getfattr
3912          */
3913         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3914
3915         nfs_fattr_init(info->fattr);
3916         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3917 }
3918
3919 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3920                 struct nfs_fsinfo *info)
3921 {
3922         struct nfs4_exception exception = {
3923                 .interruptible = true,
3924         };
3925         int err;
3926         do {
3927                 err = _nfs4_lookup_root(server, fhandle, info);
3928                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3929                 switch (err) {
3930                 case 0:
3931                 case -NFS4ERR_WRONGSEC:
3932                         goto out;
3933                 default:
3934                         err = nfs4_handle_exception(server, err, &exception);
3935                 }
3936         } while (exception.retry);
3937 out:
3938         return err;
3939 }
3940
3941 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3942                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3943 {
3944         struct rpc_auth_create_args auth_args = {
3945                 .pseudoflavor = flavor,
3946         };
3947         struct rpc_auth *auth;
3948
3949         auth = rpcauth_create(&auth_args, server->client);
3950         if (IS_ERR(auth))
3951                 return -EACCES;
3952         return nfs4_lookup_root(server, fhandle, info);
3953 }
3954
3955 /*
3956  * Retry pseudoroot lookup with various security flavors.  We do this when:
3957  *
3958  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3959  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3960  *
3961  * Returns zero on success, or a negative NFS4ERR value, or a
3962  * negative errno value.
3963  */
3964 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3965                               struct nfs_fsinfo *info)
3966 {
3967         /* Per 3530bis 15.33.5 */
3968         static const rpc_authflavor_t flav_array[] = {
3969                 RPC_AUTH_GSS_KRB5P,
3970                 RPC_AUTH_GSS_KRB5I,
3971                 RPC_AUTH_GSS_KRB5,
3972                 RPC_AUTH_UNIX,                  /* courtesy */
3973                 RPC_AUTH_NULL,
3974         };
3975         int status = -EPERM;
3976         size_t i;
3977
3978         if (server->auth_info.flavor_len > 0) {
3979                 /* try each flavor specified by user */
3980                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3981                         status = nfs4_lookup_root_sec(server, fhandle, info,
3982                                                 server->auth_info.flavors[i]);
3983                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3984                                 continue;
3985                         break;
3986                 }
3987         } else {
3988                 /* no flavors specified by user, try default list */
3989                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3990                         status = nfs4_lookup_root_sec(server, fhandle, info,
3991                                                       flav_array[i]);
3992                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3993                                 continue;
3994                         break;
3995                 }
3996         }
3997
3998         /*
3999          * -EACCES could mean that the user doesn't have correct permissions
4000          * to access the mount.  It could also mean that we tried to mount
4001          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4002          * existing mount programs don't handle -EACCES very well so it should
4003          * be mapped to -EPERM instead.
4004          */
4005         if (status == -EACCES)
4006                 status = -EPERM;
4007         return status;
4008 }
4009
4010 /**
4011  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4012  * @server: initialized nfs_server handle
4013  * @fhandle: we fill in the pseudo-fs root file handle
4014  * @info: we fill in an FSINFO struct
4015  * @auth_probe: probe the auth flavours
4016  *
4017  * Returns zero on success, or a negative errno.
4018  */
4019 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4020                          struct nfs_fsinfo *info,
4021                          bool auth_probe)
4022 {
4023         int status = 0;
4024
4025         if (!auth_probe)
4026                 status = nfs4_lookup_root(server, fhandle, info);
4027
4028         if (auth_probe || status == NFS4ERR_WRONGSEC)
4029                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4030                                 fhandle, info);
4031
4032         if (status == 0)
4033                 status = nfs4_server_capabilities(server, fhandle);
4034         if (status == 0)
4035                 status = nfs4_do_fsinfo(server, fhandle, info);
4036
4037         return nfs4_map_errors(status);
4038 }
4039
4040 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4041                               struct nfs_fsinfo *info)
4042 {
4043         int error;
4044         struct nfs_fattr *fattr = info->fattr;
4045         struct nfs4_label *label = fattr->label;
4046
4047         error = nfs4_server_capabilities(server, mntfh);
4048         if (error < 0) {
4049                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4050                 return error;
4051         }
4052
4053         error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL);
4054         if (error < 0) {
4055                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4056                 goto out;
4057         }
4058
4059         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4060             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4061                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4062
4063 out:
4064         return error;
4065 }
4066
4067 /*
4068  * Get locations and (maybe) other attributes of a referral.
4069  * Note that we'll actually follow the referral later when
4070  * we detect fsid mismatch in inode revalidation
4071  */
4072 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4073                              const struct qstr *name, struct nfs_fattr *fattr,
4074                              struct nfs_fh *fhandle)
4075 {
4076         int status = -ENOMEM;
4077         struct page *page = NULL;
4078         struct nfs4_fs_locations *locations = NULL;
4079
4080         page = alloc_page(GFP_KERNEL);
4081         if (page == NULL)
4082                 goto out;
4083         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4084         if (locations == NULL)
4085                 goto out;
4086
4087         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4088         if (status != 0)
4089                 goto out;
4090
4091         /*
4092          * If the fsid didn't change, this is a migration event, not a
4093          * referral.  Cause us to drop into the exception handler, which
4094          * will kick off migration recovery.
4095          */
4096         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
4097                 dprintk("%s: server did not return a different fsid for"
4098                         " a referral at %s\n", __func__, name->name);
4099                 status = -NFS4ERR_MOVED;
4100                 goto out;
4101         }
4102         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4103         nfs_fixup_referral_attributes(&locations->fattr);
4104
4105         /* replace the lookup nfs_fattr with the locations nfs_fattr */
4106         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
4107         memset(fhandle, 0, sizeof(struct nfs_fh));
4108 out:
4109         if (page)
4110                 __free_page(page);
4111         kfree(locations);
4112         return status;
4113 }
4114
4115 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4116                                 struct nfs_fattr *fattr, struct nfs4_label *label,
4117                                 struct inode *inode)
4118 {
4119         __u32 bitmask[NFS4_BITMASK_SZ];
4120         struct nfs4_getattr_arg args = {
4121                 .fh = fhandle,
4122                 .bitmask = bitmask,
4123         };
4124         struct nfs4_getattr_res res = {
4125                 .fattr = fattr,
4126                 .label = label,
4127                 .server = server,
4128         };
4129         struct rpc_message msg = {
4130                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4131                 .rpc_argp = &args,
4132                 .rpc_resp = &res,
4133         };
4134         unsigned short task_flags = 0;
4135
4136         /* Is this is an attribute revalidation, subject to softreval? */
4137         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4138                 task_flags |= RPC_TASK_TIMEOUT;
4139
4140         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode);
4141
4142         nfs_fattr_init(fattr);
4143         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4144         return nfs4_do_call_sync(server->client, server, &msg,
4145                         &args.seq_args, &res.seq_res, task_flags);
4146 }
4147
4148 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4149                                 struct nfs_fattr *fattr, struct nfs4_label *label,
4150                                 struct inode *inode)
4151 {
4152         struct nfs4_exception exception = {
4153                 .interruptible = true,
4154         };
4155         int err;
4156         do {
4157                 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode);
4158                 trace_nfs4_getattr(server, fhandle, fattr, err);
4159                 err = nfs4_handle_exception(server, err,
4160                                 &exception);
4161         } while (exception.retry);
4162         return err;
4163 }
4164
4165 /*
4166  * The file is not closed if it is opened due to the a request to change
4167  * the size of the file. The open call will not be needed once the
4168  * VFS layer lookup-intents are implemented.
4169  *
4170  * Close is called when the inode is destroyed.
4171  * If we haven't opened the file for O_WRONLY, we
4172  * need to in the size_change case to obtain a stateid.
4173  *
4174  * Got race?
4175  * Because OPEN is always done by name in nfsv4, it is
4176  * possible that we opened a different file by the same
4177  * name.  We can recognize this race condition, but we
4178  * can't do anything about it besides returning an error.
4179  *
4180  * This will be fixed with VFS changes (lookup-intent).
4181  */
4182 static int
4183 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4184                   struct iattr *sattr)
4185 {
4186         struct inode *inode = d_inode(dentry);
4187         const struct cred *cred = NULL;
4188         struct nfs_open_context *ctx = NULL;
4189         struct nfs4_label *label = NULL;
4190         int status;
4191
4192         if (pnfs_ld_layoutret_on_setattr(inode) &&
4193             sattr->ia_valid & ATTR_SIZE &&
4194             sattr->ia_size < i_size_read(inode))
4195                 pnfs_commit_and_return_layout(inode);
4196
4197         nfs_fattr_init(fattr);
4198
4199         /* Deal with open(O_TRUNC) */
4200         if (sattr->ia_valid & ATTR_OPEN)
4201                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4202
4203         /* Optimization: if the end result is no change, don't RPC */
4204         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4205                 return 0;
4206
4207         /* Search for an existing open(O_WRITE) file */
4208         if (sattr->ia_valid & ATTR_FILE) {
4209
4210                 ctx = nfs_file_open_context(sattr->ia_file);
4211                 if (ctx)
4212                         cred = ctx->cred;
4213         }
4214
4215         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4216         if (IS_ERR(label))
4217                 return PTR_ERR(label);
4218
4219         /* Return any delegations if we're going to change ACLs */
4220         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4221                 nfs4_inode_make_writeable(inode);
4222
4223         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label);
4224         if (status == 0) {
4225                 nfs_setattr_update_inode(inode, sattr, fattr);
4226                 nfs_setsecurity(inode, fattr, label);
4227         }
4228         nfs4_label_free(label);
4229         return status;
4230 }
4231
4232 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4233                 struct dentry *dentry, struct nfs_fh *fhandle,
4234                 struct nfs_fattr *fattr, struct nfs4_label *label)
4235 {
4236         struct nfs_server *server = NFS_SERVER(dir);
4237         int                    status;
4238         struct nfs4_lookup_arg args = {
4239                 .bitmask = server->attr_bitmask,
4240                 .dir_fh = NFS_FH(dir),
4241                 .name = &dentry->d_name,
4242         };
4243         struct nfs4_lookup_res res = {
4244                 .server = server,
4245                 .fattr = fattr,
4246                 .label = label,
4247                 .fh = fhandle,
4248         };
4249         struct rpc_message msg = {
4250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4251                 .rpc_argp = &args,
4252                 .rpc_resp = &res,
4253         };
4254         unsigned short task_flags = 0;
4255
4256         /* Is this is an attribute revalidation, subject to softreval? */
4257         if (nfs_lookup_is_soft_revalidate(dentry))
4258                 task_flags |= RPC_TASK_TIMEOUT;
4259
4260         args.bitmask = nfs4_bitmask(server, label);
4261
4262         nfs_fattr_init(fattr);
4263
4264         dprintk("NFS call  lookup %pd2\n", dentry);
4265         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4266         status = nfs4_do_call_sync(clnt, server, &msg,
4267                         &args.seq_args, &res.seq_res, task_flags);
4268         dprintk("NFS reply lookup: %d\n", status);
4269         return status;
4270 }
4271
4272 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4273 {
4274         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4275                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4276         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4277         fattr->nlink = 2;
4278 }
4279
4280 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4281                                    struct dentry *dentry, struct nfs_fh *fhandle,
4282                                    struct nfs_fattr *fattr, struct nfs4_label *label)
4283 {
4284         struct nfs4_exception exception = {
4285                 .interruptible = true,
4286         };
4287         struct rpc_clnt *client = *clnt;
4288         const struct qstr *name = &dentry->d_name;
4289         int err;
4290         do {
4291                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr, label);
4292                 trace_nfs4_lookup(dir, name, err);
4293                 switch (err) {
4294                 case -NFS4ERR_BADNAME:
4295                         err = -ENOENT;
4296                         goto out;
4297                 case -NFS4ERR_MOVED:
4298                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4299                         if (err == -NFS4ERR_MOVED)
4300                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4301                         goto out;
4302                 case -NFS4ERR_WRONGSEC:
4303                         err = -EPERM;
4304                         if (client != *clnt)
4305                                 goto out;
4306                         client = nfs4_negotiate_security(client, dir, name);
4307                         if (IS_ERR(client))
4308                                 return PTR_ERR(client);
4309
4310                         exception.retry = 1;
4311                         break;
4312                 default:
4313                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4314                 }
4315         } while (exception.retry);
4316
4317 out:
4318         if (err == 0)
4319                 *clnt = client;
4320         else if (client != *clnt)
4321                 rpc_shutdown_client(client);
4322
4323         return err;
4324 }
4325
4326 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4327                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4328                             struct nfs4_label *label)
4329 {
4330         int status;
4331         struct rpc_clnt *client = NFS_CLIENT(dir);
4332
4333         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, label);
4334         if (client != NFS_CLIENT(dir)) {
4335                 rpc_shutdown_client(client);
4336                 nfs_fixup_secinfo_attributes(fattr);
4337         }
4338         return status;
4339 }
4340
4341 struct rpc_clnt *
4342 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4343                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4344 {
4345         struct rpc_clnt *client = NFS_CLIENT(dir);
4346         int status;
4347
4348         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr, NULL);
4349         if (status < 0)
4350                 return ERR_PTR(status);
4351         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4352 }
4353
4354 static int _nfs4_proc_lookupp(struct inode *inode,
4355                 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4356                 struct nfs4_label *label)
4357 {
4358         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4359         struct nfs_server *server = NFS_SERVER(inode);
4360         int                    status;
4361         struct nfs4_lookupp_arg args = {
4362                 .bitmask = server->attr_bitmask,
4363                 .fh = NFS_FH(inode),
4364         };
4365         struct nfs4_lookupp_res res = {
4366                 .server = server,
4367                 .fattr = fattr,
4368                 .label = label,
4369                 .fh = fhandle,
4370         };
4371         struct rpc_message msg = {
4372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4373                 .rpc_argp = &args,
4374                 .rpc_resp = &res,
4375         };
4376
4377         args.bitmask = nfs4_bitmask(server, label);
4378
4379         nfs_fattr_init(fattr);
4380
4381         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4382         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4383                                 &res.seq_res, 0);
4384         dprintk("NFS reply lookupp: %d\n", status);
4385         return status;
4386 }
4387
4388 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4389                              struct nfs_fattr *fattr, struct nfs4_label *label)
4390 {
4391         struct nfs4_exception exception = {
4392                 .interruptible = true,
4393         };
4394         int err;
4395         do {
4396                 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label);
4397                 trace_nfs4_lookupp(inode, err);
4398                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4399                                 &exception);
4400         } while (exception.retry);
4401         return err;
4402 }
4403
4404 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4405 {
4406         struct nfs_server *server = NFS_SERVER(inode);
4407         struct nfs4_accessargs args = {
4408                 .fh = NFS_FH(inode),
4409                 .access = entry->mask,
4410         };
4411         struct nfs4_accessres res = {
4412                 .server = server,
4413         };
4414         struct rpc_message msg = {
4415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4416                 .rpc_argp = &args,
4417                 .rpc_resp = &res,
4418                 .rpc_cred = entry->cred,
4419         };
4420         int status = 0;
4421
4422         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4423                 res.fattr = nfs_alloc_fattr();
4424                 if (res.fattr == NULL)
4425                         return -ENOMEM;
4426                 args.bitmask = server->cache_consistency_bitmask;
4427         }
4428         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4429         if (!status) {
4430                 nfs_access_set_mask(entry, res.access);
4431                 if (res.fattr)
4432                         nfs_refresh_inode(inode, res.fattr);
4433         }
4434         nfs_free_fattr(res.fattr);
4435         return status;
4436 }
4437
4438 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4439 {
4440         struct nfs4_exception exception = {
4441                 .interruptible = true,
4442         };
4443         int err;
4444         do {
4445                 err = _nfs4_proc_access(inode, entry);
4446                 trace_nfs4_access(inode, err);
4447                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4448                                 &exception);
4449         } while (exception.retry);
4450         return err;
4451 }
4452
4453 /*
4454  * TODO: For the time being, we don't try to get any attributes
4455  * along with any of the zero-copy operations READ, READDIR,
4456  * READLINK, WRITE.
4457  *
4458  * In the case of the first three, we want to put the GETATTR
4459  * after the read-type operation -- this is because it is hard
4460  * to predict the length of a GETATTR response in v4, and thus
4461  * align the READ data correctly.  This means that the GETATTR
4462  * may end up partially falling into the page cache, and we should
4463  * shift it into the 'tail' of the xdr_buf before processing.
4464  * To do this efficiently, we need to know the total length
4465  * of data received, which doesn't seem to be available outside
4466  * of the RPC layer.
4467  *
4468  * In the case of WRITE, we also want to put the GETATTR after
4469  * the operation -- in this case because we want to make sure
4470  * we get the post-operation mtime and size.
4471  *
4472  * Both of these changes to the XDR layer would in fact be quite
4473  * minor, but I decided to leave them for a subsequent patch.
4474  */
4475 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4476                 unsigned int pgbase, unsigned int pglen)
4477 {
4478         struct nfs4_readlink args = {
4479                 .fh       = NFS_FH(inode),
4480                 .pgbase   = pgbase,
4481                 .pglen    = pglen,
4482                 .pages    = &page,
4483         };
4484         struct nfs4_readlink_res res;
4485         struct rpc_message msg = {
4486                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4487                 .rpc_argp = &args,
4488                 .rpc_resp = &res,
4489         };
4490
4491         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4492 }
4493
4494 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4495                 unsigned int pgbase, unsigned int pglen)
4496 {
4497         struct nfs4_exception exception = {
4498                 .interruptible = true,
4499         };
4500         int err;
4501         do {
4502                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4503                 trace_nfs4_readlink(inode, err);
4504                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4505                                 &exception);
4506         } while (exception.retry);
4507         return err;
4508 }
4509
4510 /*
4511  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4512  */
4513 static int
4514 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4515                  int flags)
4516 {
4517         struct nfs_server *server = NFS_SERVER(dir);
4518         struct nfs4_label l, *ilabel = NULL;
4519         struct nfs_open_context *ctx;
4520         struct nfs4_state *state;
4521         int status = 0;
4522
4523         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4524         if (IS_ERR(ctx))
4525                 return PTR_ERR(ctx);
4526
4527         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4528
4529         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4530                 sattr->ia_mode &= ~current_umask();
4531         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4532         if (IS_ERR(state)) {
4533                 status = PTR_ERR(state);
4534                 goto out;
4535         }
4536 out:
4537         nfs4_label_release_security(ilabel);
4538         put_nfs_open_context(ctx);
4539         return status;
4540 }
4541
4542 static int
4543 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4544 {
4545         struct nfs_server *server = NFS_SERVER(dir);
4546         struct nfs_removeargs args = {
4547                 .fh = NFS_FH(dir),
4548                 .name = *name,
4549         };
4550         struct nfs_removeres res = {
4551                 .server = server,
4552         };
4553         struct rpc_message msg = {
4554                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4555                 .rpc_argp = &args,
4556                 .rpc_resp = &res,
4557         };
4558         unsigned long timestamp = jiffies;
4559         int status;
4560
4561         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4562         if (status == 0) {
4563                 spin_lock(&dir->i_lock);
4564                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4565                                               NFS_INO_INVALID_DATA);
4566                 /* Removing a directory decrements nlink in the parent */
4567                 if (ftype == NF4DIR && dir->i_nlink > 2)
4568                         nfs4_dec_nlink_locked(dir);
4569                 spin_unlock(&dir->i_lock);
4570         }
4571         return status;
4572 }
4573
4574 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4575 {
4576         struct nfs4_exception exception = {
4577                 .interruptible = true,
4578         };
4579         struct inode *inode = d_inode(dentry);
4580         int err;
4581
4582         if (inode) {
4583                 if (inode->i_nlink == 1)
4584                         nfs4_inode_return_delegation(inode);
4585                 else
4586                         nfs4_inode_make_writeable(inode);
4587         }
4588         do {
4589                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4590                 trace_nfs4_remove(dir, &dentry->d_name, err);
4591                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4592                                 &exception);
4593         } while (exception.retry);
4594         return err;
4595 }
4596
4597 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4598 {
4599         struct nfs4_exception exception = {
4600                 .interruptible = true,
4601         };
4602         int err;
4603
4604         do {
4605                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4606                 trace_nfs4_remove(dir, name, err);
4607                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4608                                 &exception);
4609         } while (exception.retry);
4610         return err;
4611 }
4612
4613 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4614                 struct dentry *dentry,
4615                 struct inode *inode)
4616 {
4617         struct nfs_removeargs *args = msg->rpc_argp;
4618         struct nfs_removeres *res = msg->rpc_resp;
4619
4620         res->server = NFS_SB(dentry->d_sb);
4621         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4622         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4623
4624         nfs_fattr_init(res->dir_attr);
4625
4626         if (inode)
4627                 nfs4_inode_return_delegation(inode);
4628 }
4629
4630 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4631 {
4632         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4633                         &data->args.seq_args,
4634                         &data->res.seq_res,
4635                         task);
4636 }
4637
4638 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4639 {
4640         struct nfs_unlinkdata *data = task->tk_calldata;
4641         struct nfs_removeres *res = &data->res;
4642
4643         if (!nfs4_sequence_done(task, &res->seq_res))
4644                 return 0;
4645         if (nfs4_async_handle_error(task, res->server, NULL,
4646                                     &data->timeout) == -EAGAIN)
4647                 return 0;
4648         if (task->tk_status == 0)
4649                 nfs4_update_changeattr(dir, &res->cinfo,
4650                                 res->dir_attr->time_start,
4651                                 NFS_INO_INVALID_DATA);
4652         return 1;
4653 }
4654
4655 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4656                 struct dentry *old_dentry,
4657                 struct dentry *new_dentry)
4658 {
4659         struct nfs_renameargs *arg = msg->rpc_argp;
4660         struct nfs_renameres *res = msg->rpc_resp;
4661         struct inode *old_inode = d_inode(old_dentry);
4662         struct inode *new_inode = d_inode(new_dentry);
4663
4664         if (old_inode)
4665                 nfs4_inode_make_writeable(old_inode);
4666         if (new_inode)
4667                 nfs4_inode_return_delegation(new_inode);
4668         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4669         res->server = NFS_SB(old_dentry->d_sb);
4670         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4671 }
4672
4673 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4674 {
4675         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4676                         &data->args.seq_args,
4677                         &data->res.seq_res,
4678                         task);
4679 }
4680
4681 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4682                                  struct inode *new_dir)
4683 {
4684         struct nfs_renamedata *data = task->tk_calldata;
4685         struct nfs_renameres *res = &data->res;
4686
4687         if (!nfs4_sequence_done(task, &res->seq_res))
4688                 return 0;
4689         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4690                 return 0;
4691
4692         if (task->tk_status == 0) {
4693                 if (new_dir != old_dir) {
4694                         /* Note: If we moved a directory, nlink will change */
4695                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4696                                         res->old_fattr->time_start,
4697                                         NFS_INO_INVALID_OTHER |
4698                                             NFS_INO_INVALID_DATA);
4699                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4700                                         res->new_fattr->time_start,
4701                                         NFS_INO_INVALID_OTHER |
4702                                             NFS_INO_INVALID_DATA);
4703                 } else
4704                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4705                                         res->old_fattr->time_start,
4706                                         NFS_INO_INVALID_DATA);
4707         }
4708         return 1;
4709 }
4710
4711 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4712 {
4713         struct nfs_server *server = NFS_SERVER(inode);
4714         __u32 bitmask[NFS4_BITMASK_SZ];
4715         struct nfs4_link_arg arg = {
4716                 .fh     = NFS_FH(inode),
4717                 .dir_fh = NFS_FH(dir),
4718                 .name   = name,
4719                 .bitmask = bitmask,
4720         };
4721         struct nfs4_link_res res = {
4722                 .server = server,
4723                 .label = NULL,
4724         };
4725         struct rpc_message msg = {
4726                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4727                 .rpc_argp = &arg,
4728                 .rpc_resp = &res,
4729         };
4730         int status = -ENOMEM;
4731
4732         res.fattr = nfs_alloc_fattr();
4733         if (res.fattr == NULL)
4734                 goto out;
4735
4736         res.label = nfs4_label_alloc(server, GFP_KERNEL);
4737         if (IS_ERR(res.label)) {
4738                 status = PTR_ERR(res.label);
4739                 goto out;
4740         }
4741
4742         nfs4_inode_make_writeable(inode);
4743         nfs4_bitmap_copy_adjust_setattr(bitmask, nfs4_bitmask(server, res.label), inode);
4744
4745         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4746         if (!status) {
4747                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4748                                        NFS_INO_INVALID_DATA);
4749                 status = nfs_post_op_update_inode(inode, res.fattr);
4750                 if (!status)
4751                         nfs_setsecurity(inode, res.fattr, res.label);
4752         }
4753
4754
4755         nfs4_label_free(res.label);
4756
4757 out:
4758         nfs_free_fattr(res.fattr);
4759         return status;
4760 }
4761
4762 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4763 {
4764         struct nfs4_exception exception = {
4765                 .interruptible = true,
4766         };
4767         int err;
4768         do {
4769                 err = nfs4_handle_exception(NFS_SERVER(inode),
4770                                 _nfs4_proc_link(inode, dir, name),
4771                                 &exception);
4772         } while (exception.retry);
4773         return err;
4774 }
4775
4776 struct nfs4_createdata {
4777         struct rpc_message msg;
4778         struct nfs4_create_arg arg;
4779         struct nfs4_create_res res;
4780         struct nfs_fh fh;
4781         struct nfs_fattr fattr;
4782         struct nfs4_label *label;
4783 };
4784
4785 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4786                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4787 {
4788         struct nfs4_createdata *data;
4789
4790         data = kzalloc(sizeof(*data), GFP_KERNEL);
4791         if (data != NULL) {
4792                 struct nfs_server *server = NFS_SERVER(dir);
4793
4794                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4795                 if (IS_ERR(data->label))
4796                         goto out_free;
4797
4798                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4799                 data->msg.rpc_argp = &data->arg;
4800                 data->msg.rpc_resp = &data->res;
4801                 data->arg.dir_fh = NFS_FH(dir);
4802                 data->arg.server = server;
4803                 data->arg.name = name;
4804                 data->arg.attrs = sattr;
4805                 data->arg.ftype = ftype;
4806                 data->arg.bitmask = nfs4_bitmask(server, data->label);
4807                 data->arg.umask = current_umask();
4808                 data->res.server = server;
4809                 data->res.fh = &data->fh;
4810                 data->res.fattr = &data->fattr;
4811                 data->res.label = data->label;
4812                 nfs_fattr_init(data->res.fattr);
4813         }
4814         return data;
4815 out_free:
4816         kfree(data);
4817         return NULL;
4818 }
4819
4820 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4821 {
4822         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4823                                     &data->arg.seq_args, &data->res.seq_res, 1);
4824         if (status == 0) {
4825                 spin_lock(&dir->i_lock);
4826                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
4827                                 data->res.fattr->time_start,
4828                                 NFS_INO_INVALID_DATA);
4829                 /* Creating a directory bumps nlink in the parent */
4830                 if (data->arg.ftype == NF4DIR)
4831                         nfs4_inc_nlink_locked(dir);
4832                 spin_unlock(&dir->i_lock);
4833                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4834         }
4835         return status;
4836 }
4837
4838 static void nfs4_free_createdata(struct nfs4_createdata *data)
4839 {
4840         nfs4_label_free(data->label);
4841         kfree(data);
4842 }
4843
4844 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4845                 struct page *page, unsigned int len, struct iattr *sattr,
4846                 struct nfs4_label *label)
4847 {
4848         struct nfs4_createdata *data;
4849         int status = -ENAMETOOLONG;
4850
4851         if (len > NFS4_MAXPATHLEN)
4852                 goto out;
4853
4854         status = -ENOMEM;
4855         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4856         if (data == NULL)
4857                 goto out;
4858
4859         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4860         data->arg.u.symlink.pages = &page;
4861         data->arg.u.symlink.len = len;
4862         data->arg.label = label;
4863
4864         status = nfs4_do_create(dir, dentry, data);
4865
4866         nfs4_free_createdata(data);
4867 out:
4868         return status;
4869 }
4870
4871 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4872                 struct page *page, unsigned int len, struct iattr *sattr)
4873 {
4874         struct nfs4_exception exception = {
4875                 .interruptible = true,
4876         };
4877         struct nfs4_label l, *label = NULL;
4878         int err;
4879
4880         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4881
4882         do {
4883                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4884                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4885                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4886                                 &exception);
4887         } while (exception.retry);
4888
4889         nfs4_label_release_security(label);
4890         return err;
4891 }
4892
4893 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4894                 struct iattr *sattr, struct nfs4_label *label)
4895 {
4896         struct nfs4_createdata *data;
4897         int status = -ENOMEM;
4898
4899         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4900         if (data == NULL)
4901                 goto out;
4902
4903         data->arg.label = label;
4904         status = nfs4_do_create(dir, dentry, data);
4905
4906         nfs4_free_createdata(data);
4907 out:
4908         return status;
4909 }
4910
4911 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4912                 struct iattr *sattr)
4913 {
4914         struct nfs_server *server = NFS_SERVER(dir);
4915         struct nfs4_exception exception = {
4916                 .interruptible = true,
4917         };
4918         struct nfs4_label l, *label = NULL;
4919         int err;
4920
4921         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4922
4923         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4924                 sattr->ia_mode &= ~current_umask();
4925         do {
4926                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4927                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4928                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4929                                 &exception);
4930         } while (exception.retry);
4931         nfs4_label_release_security(label);
4932
4933         return err;
4934 }
4935
4936 static int _nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred,
4937                 u64 cookie, struct page **pages, unsigned int count, bool plus)
4938 {
4939         struct inode            *dir = d_inode(dentry);
4940         struct nfs4_readdir_arg args = {
4941                 .fh = NFS_FH(dir),
4942                 .pages = pages,
4943                 .pgbase = 0,
4944                 .count = count,
4945                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4946                 .plus = plus,
4947         };
4948         struct nfs4_readdir_res res;
4949         struct rpc_message msg = {
4950                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4951                 .rpc_argp = &args,
4952                 .rpc_resp = &res,
4953                 .rpc_cred = cred,
4954         };
4955         int                     status;
4956
4957         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4958                         dentry,
4959                         (unsigned long long)cookie);
4960         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4961         res.pgbase = args.pgbase;
4962         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4963         if (status >= 0) {
4964                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4965                 status += args.pgbase;
4966         }
4967
4968         nfs_invalidate_atime(dir);
4969
4970         dprintk("%s: returns %d\n", __func__, status);
4971         return status;
4972 }
4973
4974 static int nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred,
4975                 u64 cookie, struct page **pages, unsigned int count, bool plus)
4976 {
4977         struct nfs4_exception exception = {
4978                 .interruptible = true,
4979         };
4980         int err;
4981         do {
4982                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4983                                 pages, count, plus);
4984                 trace_nfs4_readdir(d_inode(dentry), err);
4985                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4986                                 &exception);
4987         } while (exception.retry);
4988         return err;
4989 }
4990
4991 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4992                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4993 {
4994         struct nfs4_createdata *data;
4995         int mode = sattr->ia_mode;
4996         int status = -ENOMEM;
4997
4998         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4999         if (data == NULL)
5000                 goto out;
5001
5002         if (S_ISFIFO(mode))
5003                 data->arg.ftype = NF4FIFO;
5004         else if (S_ISBLK(mode)) {
5005                 data->arg.ftype = NF4BLK;
5006                 data->arg.u.device.specdata1 = MAJOR(rdev);
5007                 data->arg.u.device.specdata2 = MINOR(rdev);
5008         }
5009         else if (S_ISCHR(mode)) {
5010                 data->arg.ftype = NF4CHR;
5011                 data->arg.u.device.specdata1 = MAJOR(rdev);
5012                 data->arg.u.device.specdata2 = MINOR(rdev);
5013         } else if (!S_ISSOCK(mode)) {
5014                 status = -EINVAL;
5015                 goto out_free;
5016         }
5017
5018         data->arg.label = label;
5019         status = nfs4_do_create(dir, dentry, data);
5020 out_free:
5021         nfs4_free_createdata(data);
5022 out:
5023         return status;
5024 }
5025
5026 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5027                 struct iattr *sattr, dev_t rdev)
5028 {
5029         struct nfs_server *server = NFS_SERVER(dir);
5030         struct nfs4_exception exception = {
5031                 .interruptible = true,
5032         };
5033         struct nfs4_label l, *label = NULL;
5034         int err;
5035
5036         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5037
5038         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5039                 sattr->ia_mode &= ~current_umask();
5040         do {
5041                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5042                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5043                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5044                                 &exception);
5045         } while (exception.retry);
5046
5047         nfs4_label_release_security(label);
5048
5049         return err;
5050 }
5051
5052 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5053                  struct nfs_fsstat *fsstat)
5054 {
5055         struct nfs4_statfs_arg args = {
5056                 .fh = fhandle,
5057                 .bitmask = server->attr_bitmask,
5058         };
5059         struct nfs4_statfs_res res = {
5060                 .fsstat = fsstat,
5061         };
5062         struct rpc_message msg = {
5063                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5064                 .rpc_argp = &args,
5065                 .rpc_resp = &res,
5066         };
5067
5068         nfs_fattr_init(fsstat->fattr);
5069         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5070 }
5071
5072 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5073 {
5074         struct nfs4_exception exception = {
5075                 .interruptible = true,
5076         };
5077         int err;
5078         do {
5079                 err = nfs4_handle_exception(server,
5080                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5081                                 &exception);
5082         } while (exception.retry);
5083         return err;
5084 }
5085
5086 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5087                 struct nfs_fsinfo *fsinfo)
5088 {
5089         struct nfs4_fsinfo_arg args = {
5090                 .fh = fhandle,
5091                 .bitmask = server->attr_bitmask,
5092         };
5093         struct nfs4_fsinfo_res res = {
5094                 .fsinfo = fsinfo,
5095         };
5096         struct rpc_message msg = {
5097                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5098                 .rpc_argp = &args,
5099                 .rpc_resp = &res,
5100         };
5101
5102         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5103 }
5104
5105 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5106 {
5107         struct nfs4_exception exception = {
5108                 .interruptible = true,
5109         };
5110         int err;
5111
5112         do {
5113                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5114                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5115                 if (err == 0) {
5116                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5117                         break;
5118                 }
5119                 err = nfs4_handle_exception(server, err, &exception);
5120         } while (exception.retry);
5121         return err;
5122 }
5123
5124 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5125 {
5126         int error;
5127
5128         nfs_fattr_init(fsinfo->fattr);
5129         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5130         if (error == 0) {
5131                 /* block layout checks this! */
5132                 server->pnfs_blksize = fsinfo->blksize;
5133                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5134         }
5135
5136         return error;
5137 }
5138
5139 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5140                 struct nfs_pathconf *pathconf)
5141 {
5142         struct nfs4_pathconf_arg args = {
5143                 .fh = fhandle,
5144                 .bitmask = server->attr_bitmask,
5145         };
5146         struct nfs4_pathconf_res res = {
5147                 .pathconf = pathconf,
5148         };
5149         struct rpc_message msg = {
5150                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5151                 .rpc_argp = &args,
5152                 .rpc_resp = &res,
5153         };
5154
5155         /* None of the pathconf attributes are mandatory to implement */
5156         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5157                 memset(pathconf, 0, sizeof(*pathconf));
5158                 return 0;
5159         }
5160
5161         nfs_fattr_init(pathconf->fattr);
5162         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5163 }
5164
5165 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5166                 struct nfs_pathconf *pathconf)
5167 {
5168         struct nfs4_exception exception = {
5169                 .interruptible = true,
5170         };
5171         int err;
5172
5173         do {
5174                 err = nfs4_handle_exception(server,
5175                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5176                                 &exception);
5177         } while (exception.retry);
5178         return err;
5179 }
5180
5181 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5182                 const struct nfs_open_context *ctx,
5183                 const struct nfs_lock_context *l_ctx,
5184                 fmode_t fmode)
5185 {
5186         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5187 }
5188 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5189
5190 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5191                 const struct nfs_open_context *ctx,
5192                 const struct nfs_lock_context *l_ctx,
5193                 fmode_t fmode)
5194 {
5195         nfs4_stateid _current_stateid;
5196
5197         /* If the current stateid represents a lost lock, then exit */
5198         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5199                 return true;
5200         return nfs4_stateid_match(stateid, &_current_stateid);
5201 }
5202
5203 static bool nfs4_error_stateid_expired(int err)
5204 {
5205         switch (err) {
5206         case -NFS4ERR_DELEG_REVOKED:
5207         case -NFS4ERR_ADMIN_REVOKED:
5208         case -NFS4ERR_BAD_STATEID:
5209         case -NFS4ERR_STALE_STATEID:
5210         case -NFS4ERR_OLD_STATEID:
5211         case -NFS4ERR_OPENMODE:
5212         case -NFS4ERR_EXPIRED:
5213                 return true;
5214         }
5215         return false;
5216 }
5217
5218 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5219 {
5220         struct nfs_server *server = NFS_SERVER(hdr->inode);
5221
5222         trace_nfs4_read(hdr, task->tk_status);
5223         if (task->tk_status < 0) {
5224                 struct nfs4_exception exception = {
5225                         .inode = hdr->inode,
5226                         .state = hdr->args.context->state,
5227                         .stateid = &hdr->args.stateid,
5228                 };
5229                 task->tk_status = nfs4_async_handle_exception(task,
5230                                 server, task->tk_status, &exception);
5231                 if (exception.retry) {
5232                         rpc_restart_call_prepare(task);
5233                         return -EAGAIN;
5234                 }
5235         }
5236
5237         if (task->tk_status > 0)
5238                 renew_lease(server, hdr->timestamp);
5239         return 0;
5240 }
5241
5242 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5243                 struct nfs_pgio_args *args)
5244 {
5245
5246         if (!nfs4_error_stateid_expired(task->tk_status) ||
5247                 nfs4_stateid_is_current(&args->stateid,
5248                                 args->context,
5249                                 args->lock_context,
5250                                 FMODE_READ))
5251                 return false;
5252         rpc_restart_call_prepare(task);
5253         return true;
5254 }
5255
5256 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5257 {
5258
5259         dprintk("--> %s\n", __func__);
5260
5261         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5262                 return -EAGAIN;
5263         if (nfs4_read_stateid_changed(task, &hdr->args))
5264                 return -EAGAIN;
5265         if (task->tk_status > 0)
5266                 nfs_invalidate_atime(hdr->inode);
5267         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5268                                     nfs4_read_done_cb(task, hdr);
5269 }
5270
5271 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5272                                  struct rpc_message *msg)
5273 {
5274         hdr->timestamp   = jiffies;
5275         if (!hdr->pgio_done_cb)
5276                 hdr->pgio_done_cb = nfs4_read_done_cb;
5277         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5278         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5279 }
5280
5281 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5282                                       struct nfs_pgio_header *hdr)
5283 {
5284         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5285                         &hdr->args.seq_args,
5286                         &hdr->res.seq_res,
5287                         task))
5288                 return 0;
5289         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5290                                 hdr->args.lock_context,
5291                                 hdr->rw_mode) == -EIO)
5292                 return -EIO;
5293         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5294                 return -EIO;
5295         return 0;
5296 }
5297
5298 static int nfs4_write_done_cb(struct rpc_task *task,
5299                               struct nfs_pgio_header *hdr)
5300 {
5301         struct inode *inode = hdr->inode;
5302
5303         trace_nfs4_write(hdr, task->tk_status);
5304         if (task->tk_status < 0) {
5305                 struct nfs4_exception exception = {
5306                         .inode = hdr->inode,
5307                         .state = hdr->args.context->state,
5308                         .stateid = &hdr->args.stateid,
5309                 };
5310                 task->tk_status = nfs4_async_handle_exception(task,
5311                                 NFS_SERVER(inode), task->tk_status,
5312                                 &exception);
5313                 if (exception.retry) {
5314                         rpc_restart_call_prepare(task);
5315                         return -EAGAIN;
5316                 }
5317         }
5318         if (task->tk_status >= 0) {
5319                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5320                 nfs_writeback_update_inode(hdr);
5321         }
5322         return 0;
5323 }
5324
5325 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5326                 struct nfs_pgio_args *args)
5327 {
5328
5329         if (!nfs4_error_stateid_expired(task->tk_status) ||
5330                 nfs4_stateid_is_current(&args->stateid,
5331                                 args->context,
5332                                 args->lock_context,
5333                                 FMODE_WRITE))
5334                 return false;
5335         rpc_restart_call_prepare(task);
5336         return true;
5337 }
5338
5339 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5340 {
5341         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5342                 return -EAGAIN;
5343         if (nfs4_write_stateid_changed(task, &hdr->args))
5344                 return -EAGAIN;
5345         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5346                 nfs4_write_done_cb(task, hdr);
5347 }
5348
5349 static
5350 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5351 {
5352         /* Don't request attributes for pNFS or O_DIRECT writes */
5353         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5354                 return false;
5355         /* Otherwise, request attributes if and only if we don't hold
5356          * a delegation
5357          */
5358         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5359 }
5360
5361 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5362                                   struct rpc_message *msg,
5363                                   struct rpc_clnt **clnt)
5364 {
5365         struct nfs_server *server = NFS_SERVER(hdr->inode);
5366
5367         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5368                 hdr->args.bitmask = NULL;
5369                 hdr->res.fattr = NULL;
5370         } else
5371                 hdr->args.bitmask = server->cache_consistency_bitmask;
5372
5373         if (!hdr->pgio_done_cb)
5374                 hdr->pgio_done_cb = nfs4_write_done_cb;
5375         hdr->res.server = server;
5376         hdr->timestamp   = jiffies;
5377
5378         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5379         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5380         nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5381 }
5382
5383 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5384 {
5385         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5386                         &data->args.seq_args,
5387                         &data->res.seq_res,
5388                         task);
5389 }
5390
5391 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5392 {
5393         struct inode *inode = data->inode;
5394
5395         trace_nfs4_commit(data, task->tk_status);
5396         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5397                                     NULL, NULL) == -EAGAIN) {
5398                 rpc_restart_call_prepare(task);
5399                 return -EAGAIN;
5400         }
5401         return 0;
5402 }
5403
5404 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5405 {
5406         if (!nfs4_sequence_done(task, &data->res.seq_res))
5407                 return -EAGAIN;
5408         return data->commit_done_cb(task, data);
5409 }
5410
5411 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5412                                    struct rpc_clnt **clnt)
5413 {
5414         struct nfs_server *server = NFS_SERVER(data->inode);
5415
5416         if (data->commit_done_cb == NULL)
5417                 data->commit_done_cb = nfs4_commit_done_cb;
5418         data->res.server = server;
5419         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5420         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5421         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5422 }
5423
5424 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5425                                 struct nfs_commitres *res)
5426 {
5427         struct inode *dst_inode = file_inode(dst);
5428         struct nfs_server *server = NFS_SERVER(dst_inode);
5429         struct rpc_message msg = {
5430                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5431                 .rpc_argp = args,
5432                 .rpc_resp = res,
5433         };
5434
5435         args->fh = NFS_FH(dst_inode);
5436         return nfs4_call_sync(server->client, server, &msg,
5437                         &args->seq_args, &res->seq_res, 1);
5438 }
5439
5440 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5441 {
5442         struct nfs_commitargs args = {
5443                 .offset = offset,
5444                 .count = count,
5445         };
5446         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5447         struct nfs4_exception exception = { };
5448         int status;
5449
5450         do {
5451                 status = _nfs4_proc_commit(dst, &args, res);
5452                 status = nfs4_handle_exception(dst_server, status, &exception);
5453         } while (exception.retry);
5454
5455         return status;
5456 }
5457
5458 struct nfs4_renewdata {
5459         struct nfs_client       *client;
5460         unsigned long           timestamp;
5461 };
5462
5463 /*
5464  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5465  * standalone procedure for queueing an asynchronous RENEW.
5466  */
5467 static void nfs4_renew_release(void *calldata)
5468 {
5469         struct nfs4_renewdata *data = calldata;
5470         struct nfs_client *clp = data->client;
5471
5472         if (refcount_read(&clp->cl_count) > 1)
5473                 nfs4_schedule_state_renewal(clp);
5474         nfs_put_client(clp);
5475         kfree(data);
5476 }
5477
5478 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5479 {
5480         struct nfs4_renewdata *data = calldata;
5481         struct nfs_client *clp = data->client;
5482         unsigned long timestamp = data->timestamp;
5483
5484         trace_nfs4_renew_async(clp, task->tk_status);
5485         switch (task->tk_status) {
5486         case 0:
5487                 break;
5488         case -NFS4ERR_LEASE_MOVED:
5489                 nfs4_schedule_lease_moved_recovery(clp);
5490                 break;
5491         default:
5492                 /* Unless we're shutting down, schedule state recovery! */
5493                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5494                         return;
5495                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5496                         nfs4_schedule_lease_recovery(clp);
5497                         return;
5498                 }
5499                 nfs4_schedule_path_down_recovery(clp);
5500         }
5501         do_renew_lease(clp, timestamp);
5502 }
5503
5504 static const struct rpc_call_ops nfs4_renew_ops = {
5505         .rpc_call_done = nfs4_renew_done,
5506         .rpc_release = nfs4_renew_release,
5507 };
5508
5509 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5510 {
5511         struct rpc_message msg = {
5512                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5513                 .rpc_argp       = clp,
5514                 .rpc_cred       = cred,
5515         };
5516         struct nfs4_renewdata *data;
5517
5518         if (renew_flags == 0)
5519                 return 0;
5520         if (!refcount_inc_not_zero(&clp->cl_count))
5521                 return -EIO;
5522         data = kmalloc(sizeof(*data), GFP_NOFS);
5523         if (data == NULL) {
5524                 nfs_put_client(clp);
5525                 return -ENOMEM;
5526         }
5527         data->client = clp;
5528         data->timestamp = jiffies;
5529         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5530                         &nfs4_renew_ops, data);
5531 }
5532
5533 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5534 {
5535         struct rpc_message msg = {
5536                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5537                 .rpc_argp       = clp,
5538                 .rpc_cred       = cred,
5539         };
5540         unsigned long now = jiffies;
5541         int status;
5542
5543         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5544         if (status < 0)
5545                 return status;
5546         do_renew_lease(clp, now);
5547         return 0;
5548 }
5549
5550 static inline int nfs4_server_supports_acls(struct nfs_server *server)
5551 {
5552         return server->caps & NFS_CAP_ACLS;
5553 }
5554
5555 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5556  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5557  * the stack.
5558  */
5559 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5560
5561 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5562                 struct page **pages)
5563 {
5564         struct page *newpage, **spages;
5565         int rc = 0;
5566         size_t len;
5567         spages = pages;
5568
5569         do {
5570                 len = min_t(size_t, PAGE_SIZE, buflen);
5571                 newpage = alloc_page(GFP_KERNEL);
5572
5573                 if (newpage == NULL)
5574                         goto unwind;
5575                 memcpy(page_address(newpage), buf, len);
5576                 buf += len;
5577                 buflen -= len;
5578                 *pages++ = newpage;
5579                 rc++;
5580         } while (buflen != 0);
5581
5582         return rc;
5583
5584 unwind:
5585         for(; rc > 0; rc--)
5586                 __free_page(spages[rc-1]);
5587         return -ENOMEM;
5588 }
5589
5590 struct nfs4_cached_acl {
5591         int cached;
5592         size_t len;
5593         char data[];
5594 };
5595
5596 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5597 {
5598         struct nfs_inode *nfsi = NFS_I(inode);
5599
5600         spin_lock(&inode->i_lock);
5601         kfree(nfsi->nfs4_acl);
5602         nfsi->nfs4_acl = acl;
5603         spin_unlock(&inode->i_lock);
5604 }
5605
5606 static void nfs4_zap_acl_attr(struct inode *inode)
5607 {
5608         nfs4_set_cached_acl(inode, NULL);
5609 }
5610
5611 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
5612 {
5613         struct nfs_inode *nfsi = NFS_I(inode);
5614         struct nfs4_cached_acl *acl;
5615         int ret = -ENOENT;
5616
5617         spin_lock(&inode->i_lock);
5618         acl = nfsi->nfs4_acl;
5619         if (acl == NULL)
5620                 goto out;
5621         if (buf == NULL) /* user is just asking for length */
5622                 goto out_len;
5623         if (acl->cached == 0)
5624                 goto out;
5625         ret = -ERANGE; /* see getxattr(2) man page */
5626         if (acl->len > buflen)
5627                 goto out;
5628         memcpy(buf, acl->data, acl->len);
5629 out_len:
5630         ret = acl->len;
5631 out:
5632         spin_unlock(&inode->i_lock);
5633         return ret;
5634 }
5635
5636 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
5637 {
5638         struct nfs4_cached_acl *acl;
5639         size_t buflen = sizeof(*acl) + acl_len;
5640
5641         if (buflen <= PAGE_SIZE) {
5642                 acl = kmalloc(buflen, GFP_KERNEL);
5643                 if (acl == NULL)
5644                         goto out;
5645                 acl->cached = 1;
5646                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5647         } else {
5648                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5649                 if (acl == NULL)
5650                         goto out;
5651                 acl->cached = 0;
5652         }
5653         acl->len = acl_len;
5654 out:
5655         nfs4_set_cached_acl(inode, acl);
5656 }
5657
5658 /*
5659  * The getxattr API returns the required buffer length when called with a
5660  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5661  * the required buf.  On a NULL buf, we send a page of data to the server
5662  * guessing that the ACL request can be serviced by a page. If so, we cache
5663  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5664  * the cache. If not so, we throw away the page, and cache the required
5665  * length. The next getxattr call will then produce another round trip to
5666  * the server, this time with the input buf of the required size.
5667  */
5668 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5669 {
5670         struct page **pages;
5671         struct nfs_getaclargs args = {
5672                 .fh = NFS_FH(inode),
5673                 .acl_len = buflen,
5674         };
5675         struct nfs_getaclres res = {
5676                 .acl_len = buflen,
5677         };
5678         struct rpc_message msg = {
5679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5680                 .rpc_argp = &args,
5681                 .rpc_resp = &res,
5682         };
5683         unsigned int npages;
5684         int ret = -ENOMEM, i;
5685         struct nfs_server *server = NFS_SERVER(inode);
5686
5687         if (buflen == 0)
5688                 buflen = server->rsize;
5689
5690         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5691         pages = kmalloc_array(npages, sizeof(struct page *), GFP_NOFS);
5692         if (!pages)
5693                 return -ENOMEM;
5694
5695         args.acl_pages = pages;
5696
5697         for (i = 0; i < npages; i++) {
5698                 pages[i] = alloc_page(GFP_KERNEL);
5699                 if (!pages[i])
5700                         goto out_free;
5701         }
5702
5703         /* for decoding across pages */
5704         res.acl_scratch = alloc_page(GFP_KERNEL);
5705         if (!res.acl_scratch)
5706                 goto out_free;
5707
5708         args.acl_len = npages * PAGE_SIZE;
5709
5710         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5711                 __func__, buf, buflen, npages, args.acl_len);
5712         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5713                              &msg, &args.seq_args, &res.seq_res, 0);
5714         if (ret)
5715                 goto out_free;
5716
5717         /* Handle the case where the passed-in buffer is too short */
5718         if (res.acl_flags & NFS4_ACL_TRUNC) {
5719                 /* Did the user only issue a request for the acl length? */
5720                 if (buf == NULL)
5721                         goto out_ok;
5722                 ret = -ERANGE;
5723                 goto out_free;
5724         }
5725         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5726         if (buf) {
5727                 if (res.acl_len > buflen) {
5728                         ret = -ERANGE;
5729                         goto out_free;
5730                 }
5731                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5732         }
5733 out_ok:
5734         ret = res.acl_len;
5735 out_free:
5736         for (i = 0; i < npages; i++)
5737                 if (pages[i])
5738                         __free_page(pages[i]);
5739         if (res.acl_scratch)
5740                 __free_page(res.acl_scratch);
5741         kfree(pages);
5742         return ret;
5743 }
5744
5745 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5746 {
5747         struct nfs4_exception exception = {
5748                 .interruptible = true,
5749         };
5750         ssize_t ret;
5751         do {
5752                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5753                 trace_nfs4_get_acl(inode, ret);
5754                 if (ret >= 0)
5755                         break;
5756                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5757         } while (exception.retry);
5758         return ret;
5759 }
5760
5761 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5762 {
5763         struct nfs_server *server = NFS_SERVER(inode);
5764         int ret;
5765
5766         if (!nfs4_server_supports_acls(server))
5767                 return -EOPNOTSUPP;
5768         ret = nfs_revalidate_inode(server, inode);
5769         if (ret < 0)
5770                 return ret;
5771         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5772                 nfs_zap_acl_cache(inode);
5773         ret = nfs4_read_cached_acl(inode, buf, buflen);
5774         if (ret != -ENOENT)
5775                 /* -ENOENT is returned if there is no ACL or if there is an ACL
5776                  * but no cached acl data, just the acl length */
5777                 return ret;
5778         return nfs4_get_acl_uncached(inode, buf, buflen);
5779 }
5780
5781 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5782 {
5783         struct nfs_server *server = NFS_SERVER(inode);
5784         struct page *pages[NFS4ACL_MAXPAGES];
5785         struct nfs_setaclargs arg = {
5786                 .fh             = NFS_FH(inode),
5787                 .acl_pages      = pages,
5788                 .acl_len        = buflen,
5789         };
5790         struct nfs_setaclres res;
5791         struct rpc_message msg = {
5792                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5793                 .rpc_argp       = &arg,
5794                 .rpc_resp       = &res,
5795         };
5796         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5797         int ret, i;
5798
5799         if (!nfs4_server_supports_acls(server))
5800                 return -EOPNOTSUPP;
5801         if (npages > ARRAY_SIZE(pages))
5802                 return -ERANGE;
5803         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5804         if (i < 0)
5805                 return i;
5806         nfs4_inode_make_writeable(inode);
5807         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5808
5809         /*
5810          * Free each page after tx, so the only ref left is
5811          * held by the network stack
5812          */
5813         for (; i > 0; i--)
5814                 put_page(pages[i-1]);
5815
5816         /*
5817          * Acl update can result in inode attribute update.
5818          * so mark the attribute cache invalid.
5819          */
5820         spin_lock(&inode->i_lock);
5821         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE
5822                 | NFS_INO_INVALID_CTIME
5823                 | NFS_INO_REVAL_FORCED;
5824         spin_unlock(&inode->i_lock);
5825         nfs_access_zap_cache(inode);
5826         nfs_zap_acl_cache(inode);
5827         return ret;
5828 }
5829
5830 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5831 {
5832         struct nfs4_exception exception = { };
5833         int err;
5834         do {
5835                 err = __nfs4_proc_set_acl(inode, buf, buflen);
5836                 trace_nfs4_set_acl(inode, err);
5837                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5838                                 &exception);
5839         } while (exception.retry);
5840         return err;
5841 }
5842
5843 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5844 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5845                                         size_t buflen)
5846 {
5847         struct nfs_server *server = NFS_SERVER(inode);
5848         struct nfs_fattr fattr;
5849         struct nfs4_label label = {0, 0, buflen, buf};
5850
5851         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5852         struct nfs4_getattr_arg arg = {
5853                 .fh             = NFS_FH(inode),
5854                 .bitmask        = bitmask,
5855         };
5856         struct nfs4_getattr_res res = {
5857                 .fattr          = &fattr,
5858                 .label          = &label,
5859                 .server         = server,
5860         };
5861         struct rpc_message msg = {
5862                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5863                 .rpc_argp       = &arg,
5864                 .rpc_resp       = &res,
5865         };
5866         int ret;
5867
5868         nfs_fattr_init(&fattr);
5869
5870         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5871         if (ret)
5872                 return ret;
5873         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5874                 return -ENOENT;
5875         return 0;
5876 }
5877
5878 static int nfs4_get_security_label(struct inode *inode, void *buf,
5879                                         size_t buflen)
5880 {
5881         struct nfs4_exception exception = {
5882                 .interruptible = true,
5883         };
5884         int err;
5885
5886         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5887                 return -EOPNOTSUPP;
5888
5889         do {
5890                 err = _nfs4_get_security_label(inode, buf, buflen);
5891                 trace_nfs4_get_security_label(inode, err);
5892                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5893                                 &exception);
5894         } while (exception.retry);
5895         return err;
5896 }
5897
5898 static int _nfs4_do_set_security_label(struct inode *inode,
5899                 struct nfs4_label *ilabel,
5900                 struct nfs_fattr *fattr,
5901                 struct nfs4_label *olabel)
5902 {
5903
5904         struct iattr sattr = {0};
5905         struct nfs_server *server = NFS_SERVER(inode);
5906         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5907         struct nfs_setattrargs arg = {
5908                 .fh             = NFS_FH(inode),
5909                 .iap            = &sattr,
5910                 .server         = server,
5911                 .bitmask        = bitmask,
5912                 .label          = ilabel,
5913         };
5914         struct nfs_setattrres res = {
5915                 .fattr          = fattr,
5916                 .label          = olabel,
5917                 .server         = server,
5918         };
5919         struct rpc_message msg = {
5920                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5921                 .rpc_argp       = &arg,
5922                 .rpc_resp       = &res,
5923         };
5924         int status;
5925
5926         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5927
5928         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5929         if (status)
5930                 dprintk("%s failed: %d\n", __func__, status);
5931
5932         return status;
5933 }
5934
5935 static int nfs4_do_set_security_label(struct inode *inode,
5936                 struct nfs4_label *ilabel,
5937                 struct nfs_fattr *fattr,
5938                 struct nfs4_label *olabel)
5939 {
5940         struct nfs4_exception exception = { };
5941         int err;
5942
5943         do {
5944                 err = _nfs4_do_set_security_label(inode, ilabel,
5945                                 fattr, olabel);
5946                 trace_nfs4_set_security_label(inode, err);
5947                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5948                                 &exception);
5949         } while (exception.retry);
5950         return err;
5951 }
5952
5953 static int
5954 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5955 {
5956         struct nfs4_label ilabel, *olabel = NULL;
5957         struct nfs_fattr fattr;
5958         int status;
5959
5960         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5961                 return -EOPNOTSUPP;
5962
5963         nfs_fattr_init(&fattr);
5964
5965         ilabel.pi = 0;
5966         ilabel.lfs = 0;
5967         ilabel.label = (char *)buf;
5968         ilabel.len = buflen;
5969
5970         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5971         if (IS_ERR(olabel)) {
5972                 status = -PTR_ERR(olabel);
5973                 goto out;
5974         }
5975
5976         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5977         if (status == 0)
5978                 nfs_setsecurity(inode, &fattr, olabel);
5979
5980         nfs4_label_free(olabel);
5981 out:
5982         return status;
5983 }
5984 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5985
5986
5987 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5988                                     nfs4_verifier *bootverf)
5989 {
5990         __be32 verf[2];
5991
5992         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5993                 /* An impossible timestamp guarantees this value
5994                  * will never match a generated boot time. */
5995                 verf[0] = cpu_to_be32(U32_MAX);
5996                 verf[1] = cpu_to_be32(U32_MAX);
5997         } else {
5998                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5999                 u64 ns = ktime_to_ns(nn->boot_time);
6000
6001                 verf[0] = cpu_to_be32(ns >> 32);
6002                 verf[1] = cpu_to_be32(ns);
6003         }
6004         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6005 }
6006
6007 static int
6008 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6009 {
6010         size_t len;
6011         char *str;
6012
6013         if (clp->cl_owner_id != NULL)
6014                 return 0;
6015
6016         rcu_read_lock();
6017         len = 14 +
6018                 strlen(clp->cl_rpcclient->cl_nodename) +
6019                 1 +
6020                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6021                 1;
6022         rcu_read_unlock();
6023         if (nfs4_client_id_uniquifier[0] != '\0')
6024                 len += strlen(nfs4_client_id_uniquifier) + 1;
6025         if (len > NFS4_OPAQUE_LIMIT + 1)
6026                 return -EINVAL;
6027
6028         /*
6029          * Since this string is allocated at mount time, and held until the
6030          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6031          * about a memory-reclaim deadlock.
6032          */
6033         str = kmalloc(len, GFP_KERNEL);
6034         if (!str)
6035                 return -ENOMEM;
6036
6037         rcu_read_lock();
6038         if (nfs4_client_id_uniquifier[0] != '\0')
6039                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6040                           clp->cl_rpcclient->cl_nodename,
6041                           nfs4_client_id_uniquifier,
6042                           rpc_peeraddr2str(clp->cl_rpcclient,
6043                                            RPC_DISPLAY_ADDR));
6044         else
6045                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6046                           clp->cl_rpcclient->cl_nodename,
6047                           rpc_peeraddr2str(clp->cl_rpcclient,
6048                                            RPC_DISPLAY_ADDR));
6049         rcu_read_unlock();
6050
6051         clp->cl_owner_id = str;
6052         return 0;
6053 }
6054
6055 static int
6056 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
6057 {
6058         size_t len;
6059         char *str;
6060
6061         len = 10 + 10 + 1 + 10 + 1 +
6062                 strlen(nfs4_client_id_uniquifier) + 1 +
6063                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6064
6065         if (len > NFS4_OPAQUE_LIMIT + 1)
6066                 return -EINVAL;
6067
6068         /*
6069          * Since this string is allocated at mount time, and held until the
6070          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6071          * about a memory-reclaim deadlock.
6072          */
6073         str = kmalloc(len, GFP_KERNEL);
6074         if (!str)
6075                 return -ENOMEM;
6076
6077         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6078                         clp->rpc_ops->version, clp->cl_minorversion,
6079                         nfs4_client_id_uniquifier,
6080                         clp->cl_rpcclient->cl_nodename);
6081         clp->cl_owner_id = str;
6082         return 0;
6083 }
6084
6085 static int
6086 nfs4_init_uniform_client_string(struct nfs_client *clp)
6087 {
6088         size_t len;
6089         char *str;
6090
6091         if (clp->cl_owner_id != NULL)
6092                 return 0;
6093
6094         if (nfs4_client_id_uniquifier[0] != '\0')
6095                 return nfs4_init_uniquifier_client_string(clp);
6096
6097         len = 10 + 10 + 1 + 10 + 1 +
6098                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6099
6100         if (len > NFS4_OPAQUE_LIMIT + 1)
6101                 return -EINVAL;
6102
6103         /*
6104          * Since this string is allocated at mount time, and held until the
6105          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6106          * about a memory-reclaim deadlock.
6107          */
6108         str = kmalloc(len, GFP_KERNEL);
6109         if (!str)
6110                 return -ENOMEM;
6111
6112         scnprintf(str, len, "Linux NFSv%u.%u %s",
6113                         clp->rpc_ops->version, clp->cl_minorversion,
6114                         clp->cl_rpcclient->cl_nodename);
6115         clp->cl_owner_id = str;
6116         return 0;
6117 }
6118
6119 /*
6120  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6121  * services.  Advertise one based on the address family of the
6122  * clientaddr.
6123  */
6124 static unsigned int
6125 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6126 {
6127         if (strchr(clp->cl_ipaddr, ':') != NULL)
6128                 return scnprintf(buf, len, "tcp6");
6129         else
6130                 return scnprintf(buf, len, "tcp");
6131 }
6132
6133 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6134 {
6135         struct nfs4_setclientid *sc = calldata;
6136
6137         if (task->tk_status == 0)
6138                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6139 }
6140
6141 static const struct rpc_call_ops nfs4_setclientid_ops = {
6142         .rpc_call_done = nfs4_setclientid_done,
6143 };
6144
6145 /**
6146  * nfs4_proc_setclientid - Negotiate client ID
6147  * @clp: state data structure
6148  * @program: RPC program for NFSv4 callback service
6149  * @port: IP port number for NFS4 callback service
6150  * @cred: credential to use for this call
6151  * @res: where to place the result
6152  *
6153  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6154  */
6155 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6156                 unsigned short port, const struct cred *cred,
6157                 struct nfs4_setclientid_res *res)
6158 {
6159         nfs4_verifier sc_verifier;
6160         struct nfs4_setclientid setclientid = {
6161                 .sc_verifier = &sc_verifier,
6162                 .sc_prog = program,
6163                 .sc_clnt = clp,
6164         };
6165         struct rpc_message msg = {
6166                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6167                 .rpc_argp = &setclientid,
6168                 .rpc_resp = res,
6169                 .rpc_cred = cred,
6170         };
6171         struct rpc_task_setup task_setup_data = {
6172                 .rpc_client = clp->cl_rpcclient,
6173                 .rpc_message = &msg,
6174                 .callback_ops = &nfs4_setclientid_ops,
6175                 .callback_data = &setclientid,
6176                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6177         };
6178         unsigned long now = jiffies;
6179         int status;
6180
6181         /* nfs_client_id4 */
6182         nfs4_init_boot_verifier(clp, &sc_verifier);
6183
6184         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6185                 status = nfs4_init_uniform_client_string(clp);
6186         else
6187                 status = nfs4_init_nonuniform_client_string(clp);
6188
6189         if (status)
6190                 goto out;
6191
6192         /* cb_client4 */
6193         setclientid.sc_netid_len =
6194                                 nfs4_init_callback_netid(clp,
6195                                                 setclientid.sc_netid,
6196                                                 sizeof(setclientid.sc_netid));
6197         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6198                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6199                                 clp->cl_ipaddr, port >> 8, port & 255);
6200
6201         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6202                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6203                 clp->cl_owner_id);
6204
6205         status = nfs4_call_sync_custom(&task_setup_data);
6206         if (setclientid.sc_cred) {
6207                 kfree(clp->cl_acceptor);
6208                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6209                 put_rpccred(setclientid.sc_cred);
6210         }
6211
6212         if (status == 0)
6213                 do_renew_lease(clp, now);
6214 out:
6215         trace_nfs4_setclientid(clp, status);
6216         dprintk("NFS reply setclientid: %d\n", status);
6217         return status;
6218 }
6219
6220 /**
6221  * nfs4_proc_setclientid_confirm - Confirm client ID
6222  * @clp: state data structure
6223  * @arg: result of a previous SETCLIENTID
6224  * @cred: credential to use for this call
6225  *
6226  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6227  */
6228 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6229                 struct nfs4_setclientid_res *arg,
6230                 const struct cred *cred)
6231 {
6232         struct rpc_message msg = {
6233                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6234                 .rpc_argp = arg,
6235                 .rpc_cred = cred,
6236         };
6237         int status;
6238
6239         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6240                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6241                 clp->cl_clientid);
6242         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6243                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6244         trace_nfs4_setclientid_confirm(clp, status);
6245         dprintk("NFS reply setclientid_confirm: %d\n", status);
6246         return status;
6247 }
6248
6249 struct nfs4_delegreturndata {
6250         struct nfs4_delegreturnargs args;
6251         struct nfs4_delegreturnres res;
6252         struct nfs_fh fh;
6253         nfs4_stateid stateid;
6254         unsigned long timestamp;
6255         struct {
6256                 struct nfs4_layoutreturn_args arg;
6257                 struct nfs4_layoutreturn_res res;
6258                 struct nfs4_xdr_opaque_data ld_private;
6259                 u32 roc_barrier;
6260                 bool roc;
6261         } lr;
6262         struct nfs_fattr fattr;
6263         int rpc_status;
6264         struct inode *inode;
6265 };
6266
6267 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6268 {
6269         struct nfs4_delegreturndata *data = calldata;
6270         struct nfs4_exception exception = {
6271                 .inode = data->inode,
6272                 .stateid = &data->stateid,
6273         };
6274
6275         if (!nfs4_sequence_done(task, &data->res.seq_res))
6276                 return;
6277
6278         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6279
6280         /* Handle Layoutreturn errors */
6281         if (pnfs_roc_done(task, data->inode,
6282                                 &data->args.lr_args,
6283                                 &data->res.lr_res,
6284                                 &data->res.lr_ret) == -EAGAIN)
6285                 goto out_restart;
6286
6287         switch (task->tk_status) {
6288         case 0:
6289                 renew_lease(data->res.server, data->timestamp);
6290                 break;
6291         case -NFS4ERR_ADMIN_REVOKED:
6292         case -NFS4ERR_DELEG_REVOKED:
6293         case -NFS4ERR_EXPIRED:
6294                 nfs4_free_revoked_stateid(data->res.server,
6295                                 data->args.stateid,
6296                                 task->tk_msg.rpc_cred);
6297                 /* Fallthrough */
6298         case -NFS4ERR_BAD_STATEID:
6299         case -NFS4ERR_STALE_STATEID:
6300         case -ETIMEDOUT:
6301                 task->tk_status = 0;
6302                 break;
6303         case -NFS4ERR_OLD_STATEID:
6304                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6305                         nfs4_stateid_seqid_inc(&data->stateid);
6306                 if (data->args.bitmask) {
6307                         data->args.bitmask = NULL;
6308                         data->res.fattr = NULL;
6309                 }
6310                 goto out_restart;
6311         case -NFS4ERR_ACCESS:
6312                 if (data->args.bitmask) {
6313                         data->args.bitmask = NULL;
6314                         data->res.fattr = NULL;
6315                         goto out_restart;
6316                 }
6317                 /* Fallthrough */
6318         default:
6319                 task->tk_status = nfs4_async_handle_exception(task,
6320                                 data->res.server, task->tk_status,
6321                                 &exception);
6322                 if (exception.retry)
6323                         goto out_restart;
6324         }
6325         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6326         data->rpc_status = task->tk_status;
6327         return;
6328 out_restart:
6329         task->tk_status = 0;
6330         rpc_restart_call_prepare(task);
6331 }
6332
6333 static void nfs4_delegreturn_release(void *calldata)
6334 {
6335         struct nfs4_delegreturndata *data = calldata;
6336         struct inode *inode = data->inode;
6337
6338         if (inode) {
6339                 if (data->lr.roc)
6340                         pnfs_roc_release(&data->lr.arg, &data->lr.res,
6341                                         data->res.lr_ret);
6342                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
6343                 nfs_iput_and_deactive(inode);
6344         }
6345         kfree(calldata);
6346 }
6347
6348 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6349 {
6350         struct nfs4_delegreturndata *d_data;
6351         struct pnfs_layout_hdr *lo;
6352
6353         d_data = (struct nfs4_delegreturndata *)data;
6354
6355         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6356                 nfs4_sequence_done(task, &d_data->res.seq_res);
6357                 return;
6358         }
6359
6360         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6361         if (lo && !pnfs_layout_is_valid(lo)) {
6362                 d_data->args.lr_args = NULL;
6363                 d_data->res.lr_res = NULL;
6364         }
6365
6366         nfs4_setup_sequence(d_data->res.server->nfs_client,
6367                         &d_data->args.seq_args,
6368                         &d_data->res.seq_res,
6369                         task);
6370 }
6371
6372 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6373         .rpc_call_prepare = nfs4_delegreturn_prepare,
6374         .rpc_call_done = nfs4_delegreturn_done,
6375         .rpc_release = nfs4_delegreturn_release,
6376 };
6377
6378 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6379 {
6380         struct nfs4_delegreturndata *data;
6381         struct nfs_server *server = NFS_SERVER(inode);
6382         struct rpc_task *task;
6383         struct rpc_message msg = {
6384                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6385                 .rpc_cred = cred,
6386         };
6387         struct rpc_task_setup task_setup_data = {
6388                 .rpc_client = server->client,
6389                 .rpc_message = &msg,
6390                 .callback_ops = &nfs4_delegreturn_ops,
6391                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6392         };
6393         int status = 0;
6394
6395         data = kzalloc(sizeof(*data), GFP_NOFS);
6396         if (data == NULL)
6397                 return -ENOMEM;
6398         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
6399
6400         nfs4_state_protect(server->nfs_client,
6401                         NFS_SP4_MACH_CRED_CLEANUP,
6402                         &task_setup_data.rpc_client, &msg);
6403
6404         data->args.fhandle = &data->fh;
6405         data->args.stateid = &data->stateid;
6406         data->args.bitmask = server->cache_consistency_bitmask;
6407         nfs_copy_fh(&data->fh, NFS_FH(inode));
6408         nfs4_stateid_copy(&data->stateid, stateid);
6409         data->res.fattr = &data->fattr;
6410         data->res.server = server;
6411         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6412         data->lr.arg.ld_private = &data->lr.ld_private;
6413         nfs_fattr_init(data->res.fattr);
6414         data->timestamp = jiffies;
6415         data->rpc_status = 0;
6416         data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred);
6417         data->inode = nfs_igrab_and_active(inode);
6418         if (data->inode) {
6419                 if (data->lr.roc) {
6420                         data->args.lr_args = &data->lr.arg;
6421                         data->res.lr_res = &data->lr.res;
6422                 }
6423         } else if (data->lr.roc) {
6424                 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0);
6425                 data->lr.roc = false;
6426         }
6427
6428         task_setup_data.callback_data = data;
6429         msg.rpc_argp = &data->args;
6430         msg.rpc_resp = &data->res;
6431         task = rpc_run_task(&task_setup_data);
6432         if (IS_ERR(task))
6433                 return PTR_ERR(task);
6434         if (!issync)
6435                 goto out;
6436         status = rpc_wait_for_completion_task(task);
6437         if (status != 0)
6438                 goto out;
6439         status = data->rpc_status;
6440 out:
6441         rpc_put_task(task);
6442         return status;
6443 }
6444
6445 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6446 {
6447         struct nfs_server *server = NFS_SERVER(inode);
6448         struct nfs4_exception exception = { };
6449         int err;
6450         do {
6451                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6452                 trace_nfs4_delegreturn(inode, stateid, err);
6453                 switch (err) {
6454                         case -NFS4ERR_STALE_STATEID:
6455                         case -NFS4ERR_EXPIRED:
6456                         case 0:
6457                                 return 0;
6458                 }
6459                 err = nfs4_handle_exception(server, err, &exception);
6460         } while (exception.retry);
6461         return err;
6462 }
6463
6464 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6465 {
6466         struct inode *inode = state->inode;
6467         struct nfs_server *server = NFS_SERVER(inode);
6468         struct nfs_client *clp = server->nfs_client;
6469         struct nfs_lockt_args arg = {
6470                 .fh = NFS_FH(inode),
6471                 .fl = request,
6472         };
6473         struct nfs_lockt_res res = {
6474                 .denied = request,
6475         };
6476         struct rpc_message msg = {
6477                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6478                 .rpc_argp       = &arg,
6479                 .rpc_resp       = &res,
6480                 .rpc_cred       = state->owner->so_cred,
6481         };
6482         struct nfs4_lock_state *lsp;
6483         int status;
6484
6485         arg.lock_owner.clientid = clp->cl_clientid;
6486         status = nfs4_set_lock_state(state, request);
6487         if (status != 0)
6488                 goto out;
6489         lsp = request->fl_u.nfs4_fl.owner;
6490         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6491         arg.lock_owner.s_dev = server->s_dev;
6492         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6493         switch (status) {
6494                 case 0:
6495                         request->fl_type = F_UNLCK;
6496                         break;
6497                 case -NFS4ERR_DENIED:
6498                         status = 0;
6499         }
6500         request->fl_ops->fl_release_private(request);
6501         request->fl_ops = NULL;
6502 out:
6503         return status;
6504 }
6505
6506 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6507 {
6508         struct nfs4_exception exception = {
6509                 .interruptible = true,
6510         };
6511         int err;
6512
6513         do {
6514                 err = _nfs4_proc_getlk(state, cmd, request);
6515                 trace_nfs4_get_lock(request, state, cmd, err);
6516                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6517                                 &exception);
6518         } while (exception.retry);
6519         return err;
6520 }
6521
6522 /*
6523  * Update the seqid of a lock stateid after receiving
6524  * NFS4ERR_OLD_STATEID
6525  */
6526 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6527                 struct nfs4_lock_state *lsp)
6528 {
6529         struct nfs4_state *state = lsp->ls_state;
6530         bool ret = false;
6531
6532         spin_lock(&state->state_lock);
6533         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6534                 goto out;
6535         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6536                 nfs4_stateid_seqid_inc(dst);
6537         else
6538                 dst->seqid = lsp->ls_stateid.seqid;
6539         ret = true;
6540 out:
6541         spin_unlock(&state->state_lock);
6542         return ret;
6543 }
6544
6545 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6546                 struct nfs4_lock_state *lsp)
6547 {
6548         struct nfs4_state *state = lsp->ls_state;
6549         bool ret;
6550
6551         spin_lock(&state->state_lock);
6552         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6553         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6554         spin_unlock(&state->state_lock);
6555         return ret;
6556 }
6557
6558 struct nfs4_unlockdata {
6559         struct nfs_locku_args arg;
6560         struct nfs_locku_res res;
6561         struct nfs4_lock_state *lsp;
6562         struct nfs_open_context *ctx;
6563         struct nfs_lock_context *l_ctx;
6564         struct file_lock fl;
6565         struct nfs_server *server;
6566         unsigned long timestamp;
6567 };
6568
6569 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6570                 struct nfs_open_context *ctx,
6571                 struct nfs4_lock_state *lsp,
6572                 struct nfs_seqid *seqid)
6573 {
6574         struct nfs4_unlockdata *p;
6575         struct nfs4_state *state = lsp->ls_state;
6576         struct inode *inode = state->inode;
6577
6578         p = kzalloc(sizeof(*p), GFP_NOFS);
6579         if (p == NULL)
6580                 return NULL;
6581         p->arg.fh = NFS_FH(inode);
6582         p->arg.fl = &p->fl;
6583         p->arg.seqid = seqid;
6584         p->res.seqid = seqid;
6585         p->lsp = lsp;
6586         /* Ensure we don't close file until we're done freeing locks! */
6587         p->ctx = get_nfs_open_context(ctx);
6588         p->l_ctx = nfs_get_lock_context(ctx);
6589         locks_init_lock(&p->fl);
6590         locks_copy_lock(&p->fl, fl);
6591         p->server = NFS_SERVER(inode);
6592         spin_lock(&state->state_lock);
6593         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6594         spin_unlock(&state->state_lock);
6595         return p;
6596 }
6597
6598 static void nfs4_locku_release_calldata(void *data)
6599 {
6600         struct nfs4_unlockdata *calldata = data;
6601         nfs_free_seqid(calldata->arg.seqid);
6602         nfs4_put_lock_state(calldata->lsp);
6603         nfs_put_lock_context(calldata->l_ctx);
6604         put_nfs_open_context(calldata->ctx);
6605         kfree(calldata);
6606 }
6607
6608 static void nfs4_locku_done(struct rpc_task *task, void *data)
6609 {
6610         struct nfs4_unlockdata *calldata = data;
6611         struct nfs4_exception exception = {
6612                 .inode = calldata->lsp->ls_state->inode,
6613                 .stateid = &calldata->arg.stateid,
6614         };
6615
6616         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6617                 return;
6618         switch (task->tk_status) {
6619                 case 0:
6620                         renew_lease(calldata->server, calldata->timestamp);
6621                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6622                         if (nfs4_update_lock_stateid(calldata->lsp,
6623                                         &calldata->res.stateid))
6624                                 break;
6625                         /* Fall through */
6626                 case -NFS4ERR_ADMIN_REVOKED:
6627                 case -NFS4ERR_EXPIRED:
6628                         nfs4_free_revoked_stateid(calldata->server,
6629                                         &calldata->arg.stateid,
6630                                         task->tk_msg.rpc_cred);
6631                         /* Fall through */
6632                 case -NFS4ERR_BAD_STATEID:
6633                 case -NFS4ERR_STALE_STATEID:
6634                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6635                                                 calldata->lsp))
6636                                 rpc_restart_call_prepare(task);
6637                         break;
6638                 case -NFS4ERR_OLD_STATEID:
6639                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6640                                                 calldata->lsp))
6641                                 rpc_restart_call_prepare(task);
6642                         break;
6643                 default:
6644                         task->tk_status = nfs4_async_handle_exception(task,
6645                                         calldata->server, task->tk_status,
6646                                         &exception);
6647                         if (exception.retry)
6648                                 rpc_restart_call_prepare(task);
6649         }
6650         nfs_release_seqid(calldata->arg.seqid);
6651 }
6652
6653 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6654 {
6655         struct nfs4_unlockdata *calldata = data;
6656
6657         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6658                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6659                 return;
6660
6661         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6662                 goto out_wait;
6663         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6664                 /* Note: exit _without_ running nfs4_locku_done */
6665                 goto out_no_action;
6666         }
6667         calldata->timestamp = jiffies;
6668         if (nfs4_setup_sequence(calldata->server->nfs_client,
6669                                 &calldata->arg.seq_args,
6670                                 &calldata->res.seq_res,
6671                                 task) != 0)
6672                 nfs_release_seqid(calldata->arg.seqid);
6673         return;
6674 out_no_action:
6675         task->tk_action = NULL;
6676 out_wait:
6677         nfs4_sequence_done(task, &calldata->res.seq_res);
6678 }
6679
6680 static const struct rpc_call_ops nfs4_locku_ops = {
6681         .rpc_call_prepare = nfs4_locku_prepare,
6682         .rpc_call_done = nfs4_locku_done,
6683         .rpc_release = nfs4_locku_release_calldata,
6684 };
6685
6686 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6687                 struct nfs_open_context *ctx,
6688                 struct nfs4_lock_state *lsp,
6689                 struct nfs_seqid *seqid)
6690 {
6691         struct nfs4_unlockdata *data;
6692         struct rpc_message msg = {
6693                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6694                 .rpc_cred = ctx->cred,
6695         };
6696         struct rpc_task_setup task_setup_data = {
6697                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6698                 .rpc_message = &msg,
6699                 .callback_ops = &nfs4_locku_ops,
6700                 .workqueue = nfsiod_workqueue,
6701                 .flags = RPC_TASK_ASYNC,
6702         };
6703
6704         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6705                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6706
6707         /* Ensure this is an unlock - when canceling a lock, the
6708          * canceled lock is passed in, and it won't be an unlock.
6709          */
6710         fl->fl_type = F_UNLCK;
6711         if (fl->fl_flags & FL_CLOSE)
6712                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6713
6714         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6715         if (data == NULL) {
6716                 nfs_free_seqid(seqid);
6717                 return ERR_PTR(-ENOMEM);
6718         }
6719
6720         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6721         msg.rpc_argp = &data->arg;
6722         msg.rpc_resp = &data->res;
6723         task_setup_data.callback_data = data;
6724         return rpc_run_task(&task_setup_data);
6725 }
6726
6727 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6728 {
6729         struct inode *inode = state->inode;
6730         struct nfs4_state_owner *sp = state->owner;
6731         struct nfs_inode *nfsi = NFS_I(inode);
6732         struct nfs_seqid *seqid;
6733         struct nfs4_lock_state *lsp;
6734         struct rpc_task *task;
6735         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6736         int status = 0;
6737         unsigned char fl_flags = request->fl_flags;
6738
6739         status = nfs4_set_lock_state(state, request);
6740         /* Unlock _before_ we do the RPC call */
6741         request->fl_flags |= FL_EXISTS;
6742         /* Exclude nfs_delegation_claim_locks() */
6743         mutex_lock(&sp->so_delegreturn_mutex);
6744         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
6745         down_read(&nfsi->rwsem);
6746         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
6747                 up_read(&nfsi->rwsem);
6748                 mutex_unlock(&sp->so_delegreturn_mutex);
6749                 goto out;
6750         }
6751         up_read(&nfsi->rwsem);
6752         mutex_unlock(&sp->so_delegreturn_mutex);
6753         if (status != 0)
6754                 goto out;
6755         /* Is this a delegated lock? */
6756         lsp = request->fl_u.nfs4_fl.owner;
6757         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
6758                 goto out;
6759         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
6760         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
6761         status = -ENOMEM;
6762         if (IS_ERR(seqid))
6763                 goto out;
6764         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
6765         status = PTR_ERR(task);
6766         if (IS_ERR(task))
6767                 goto out;
6768         status = rpc_wait_for_completion_task(task);
6769         rpc_put_task(task);
6770 out:
6771         request->fl_flags = fl_flags;
6772         trace_nfs4_unlock(request, state, F_SETLK, status);
6773         return status;
6774 }
6775
6776 struct nfs4_lockdata {
6777         struct nfs_lock_args arg;
6778         struct nfs_lock_res res;
6779         struct nfs4_lock_state *lsp;
6780         struct nfs_open_context *ctx;
6781         struct file_lock fl;
6782         unsigned long timestamp;
6783         int rpc_status;
6784         int cancelled;
6785         struct nfs_server *server;
6786 };
6787
6788 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
6789                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
6790                 gfp_t gfp_mask)
6791 {
6792         struct nfs4_lockdata *p;
6793         struct inode *inode = lsp->ls_state->inode;
6794         struct nfs_server *server = NFS_SERVER(inode);
6795         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6796
6797         p = kzalloc(sizeof(*p), gfp_mask);
6798         if (p == NULL)
6799                 return NULL;
6800
6801         p->arg.fh = NFS_FH(inode);
6802         p->arg.fl = &p->fl;
6803         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
6804         if (IS_ERR(p->arg.open_seqid))
6805                 goto out_free;
6806         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
6807         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
6808         if (IS_ERR(p->arg.lock_seqid))
6809                 goto out_free_seqid;
6810         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
6811         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
6812         p->arg.lock_owner.s_dev = server->s_dev;
6813         p->res.lock_seqid = p->arg.lock_seqid;
6814         p->lsp = lsp;
6815         p->server = server;
6816         p->ctx = get_nfs_open_context(ctx);
6817         locks_init_lock(&p->fl);
6818         locks_copy_lock(&p->fl, fl);
6819         return p;
6820 out_free_seqid:
6821         nfs_free_seqid(p->arg.open_seqid);
6822 out_free:
6823         kfree(p);
6824         return NULL;
6825 }
6826
6827 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
6828 {
6829         struct nfs4_lockdata *data = calldata;
6830         struct nfs4_state *state = data->lsp->ls_state;
6831
6832         dprintk("%s: begin!\n", __func__);
6833         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
6834                 goto out_wait;
6835         /* Do we need to do an open_to_lock_owner? */
6836         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
6837                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
6838                         goto out_release_lock_seqid;
6839                 }
6840                 nfs4_stateid_copy(&data->arg.open_stateid,
6841                                 &state->open_stateid);
6842                 data->arg.new_lock_owner = 1;
6843                 data->res.open_seqid = data->arg.open_seqid;
6844         } else {
6845                 data->arg.new_lock_owner = 0;
6846                 nfs4_stateid_copy(&data->arg.lock_stateid,
6847                                 &data->lsp->ls_stateid);
6848         }
6849         if (!nfs4_valid_open_stateid(state)) {
6850                 data->rpc_status = -EBADF;
6851                 task->tk_action = NULL;
6852                 goto out_release_open_seqid;
6853         }
6854         data->timestamp = jiffies;
6855         if (nfs4_setup_sequence(data->server->nfs_client,
6856                                 &data->arg.seq_args,
6857                                 &data->res.seq_res,
6858                                 task) == 0)
6859                 return;
6860 out_release_open_seqid:
6861         nfs_release_seqid(data->arg.open_seqid);
6862 out_release_lock_seqid:
6863         nfs_release_seqid(data->arg.lock_seqid);
6864 out_wait:
6865         nfs4_sequence_done(task, &data->res.seq_res);
6866         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
6867 }
6868
6869 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
6870 {
6871         struct nfs4_lockdata *data = calldata;
6872         struct nfs4_lock_state *lsp = data->lsp;
6873
6874         dprintk("%s: begin!\n", __func__);
6875
6876         if (!nfs4_sequence_done(task, &data->res.seq_res))
6877                 return;
6878
6879         data->rpc_status = task->tk_status;
6880         switch (task->tk_status) {
6881         case 0:
6882                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
6883                                 data->timestamp);
6884                 if (data->arg.new_lock && !data->cancelled) {
6885                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
6886                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
6887                                 goto out_restart;
6888                 }
6889                 if (data->arg.new_lock_owner != 0) {
6890                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
6891                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
6892                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6893                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
6894                         goto out_restart;
6895                 break;
6896         case -NFS4ERR_BAD_STATEID:
6897         case -NFS4ERR_OLD_STATEID:
6898         case -NFS4ERR_STALE_STATEID:
6899         case -NFS4ERR_EXPIRED:
6900                 if (data->arg.new_lock_owner != 0) {
6901                         if (!nfs4_stateid_match(&data->arg.open_stateid,
6902                                                 &lsp->ls_state->open_stateid))
6903                                 goto out_restart;
6904                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
6905                                                 &lsp->ls_stateid))
6906                                 goto out_restart;
6907         }
6908 out_done:
6909         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
6910         return;
6911 out_restart:
6912         if (!data->cancelled)
6913                 rpc_restart_call_prepare(task);
6914         goto out_done;
6915 }
6916
6917 static void nfs4_lock_release(void *calldata)
6918 {
6919         struct nfs4_lockdata *data = calldata;
6920
6921         dprintk("%s: begin!\n", __func__);
6922         nfs_free_seqid(data->arg.open_seqid);
6923         if (data->cancelled && data->rpc_status == 0) {
6924                 struct rpc_task *task;
6925                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
6926                                 data->arg.lock_seqid);
6927                 if (!IS_ERR(task))
6928                         rpc_put_task_async(task);
6929                 dprintk("%s: cancelling lock!\n", __func__);
6930         } else
6931                 nfs_free_seqid(data->arg.lock_seqid);
6932         nfs4_put_lock_state(data->lsp);
6933         put_nfs_open_context(data->ctx);
6934         kfree(data);
6935         dprintk("%s: done!\n", __func__);
6936 }
6937
6938 static const struct rpc_call_ops nfs4_lock_ops = {
6939         .rpc_call_prepare = nfs4_lock_prepare,
6940         .rpc_call_done = nfs4_lock_done,
6941         .rpc_release = nfs4_lock_release,
6942 };
6943
6944 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
6945 {
6946         switch (error) {
6947         case -NFS4ERR_ADMIN_REVOKED:
6948         case -NFS4ERR_EXPIRED:
6949         case -NFS4ERR_BAD_STATEID:
6950                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6951                 if (new_lock_owner != 0 ||
6952                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
6953                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
6954                 break;
6955         case -NFS4ERR_STALE_STATEID:
6956                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6957                 nfs4_schedule_lease_recovery(server->nfs_client);
6958         }
6959 }
6960
6961 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
6962 {
6963         struct nfs4_lockdata *data;
6964         struct rpc_task *task;
6965         struct rpc_message msg = {
6966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
6967                 .rpc_cred = state->owner->so_cred,
6968         };
6969         struct rpc_task_setup task_setup_data = {
6970                 .rpc_client = NFS_CLIENT(state->inode),
6971                 .rpc_message = &msg,
6972                 .callback_ops = &nfs4_lock_ops,
6973                 .workqueue = nfsiod_workqueue,
6974                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
6975         };
6976         int ret;
6977
6978         dprintk("%s: begin!\n", __func__);
6979         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
6980                         fl->fl_u.nfs4_fl.owner,
6981                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
6982         if (data == NULL)
6983                 return -ENOMEM;
6984         if (IS_SETLKW(cmd))
6985                 data->arg.block = 1;
6986         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
6987                                 recovery_type > NFS_LOCK_NEW);
6988         msg.rpc_argp = &data->arg;
6989         msg.rpc_resp = &data->res;
6990         task_setup_data.callback_data = data;
6991         if (recovery_type > NFS_LOCK_NEW) {
6992                 if (recovery_type == NFS_LOCK_RECLAIM)
6993                         data->arg.reclaim = NFS_LOCK_RECLAIM;
6994         } else
6995                 data->arg.new_lock = 1;
6996         task = rpc_run_task(&task_setup_data);
6997         if (IS_ERR(task))
6998                 return PTR_ERR(task);
6999         ret = rpc_wait_for_completion_task(task);
7000         if (ret == 0) {
7001                 ret = data->rpc_status;
7002                 if (ret)
7003                         nfs4_handle_setlk_error(data->server, data->lsp,
7004                                         data->arg.new_lock_owner, ret);
7005         } else
7006                 data->cancelled = true;
7007         rpc_put_task(task);
7008         dprintk("%s: done, ret = %d!\n", __func__, ret);
7009         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7010         return ret;
7011 }
7012
7013 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7014 {
7015         struct nfs_server *server = NFS_SERVER(state->inode);
7016         struct nfs4_exception exception = {
7017                 .inode = state->inode,
7018         };
7019         int err;
7020
7021         do {
7022                 /* Cache the lock if possible... */
7023                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7024                         return 0;
7025                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7026                 if (err != -NFS4ERR_DELAY)
7027                         break;
7028                 nfs4_handle_exception(server, err, &exception);
7029         } while (exception.retry);
7030         return err;
7031 }
7032
7033 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7034 {
7035         struct nfs_server *server = NFS_SERVER(state->inode);
7036         struct nfs4_exception exception = {
7037                 .inode = state->inode,
7038         };
7039         int err;
7040
7041         err = nfs4_set_lock_state(state, request);
7042         if (err != 0)
7043                 return err;
7044         if (!recover_lost_locks) {
7045                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7046                 return 0;
7047         }
7048         do {
7049                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7050                         return 0;
7051                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7052                 switch (err) {
7053                 default:
7054                         goto out;
7055                 case -NFS4ERR_GRACE:
7056                 case -NFS4ERR_DELAY:
7057                         nfs4_handle_exception(server, err, &exception);
7058                         err = 0;
7059                 }
7060         } while (exception.retry);
7061 out:
7062         return err;
7063 }
7064
7065 #if defined(CONFIG_NFS_V4_1)
7066 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7067 {
7068         struct nfs4_lock_state *lsp;
7069         int status;
7070
7071         status = nfs4_set_lock_state(state, request);
7072         if (status != 0)
7073                 return status;
7074         lsp = request->fl_u.nfs4_fl.owner;
7075         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7076             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7077                 return 0;
7078         return nfs4_lock_expired(state, request);
7079 }
7080 #endif
7081
7082 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7083 {
7084         struct nfs_inode *nfsi = NFS_I(state->inode);
7085         struct nfs4_state_owner *sp = state->owner;
7086         unsigned char fl_flags = request->fl_flags;
7087         int status;
7088
7089         request->fl_flags |= FL_ACCESS;
7090         status = locks_lock_inode_wait(state->inode, request);
7091         if (status < 0)
7092                 goto out;
7093         mutex_lock(&sp->so_delegreturn_mutex);
7094         down_read(&nfsi->rwsem);
7095         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7096                 /* Yes: cache locks! */
7097                 /* ...but avoid races with delegation recall... */
7098                 request->fl_flags = fl_flags & ~FL_SLEEP;
7099                 status = locks_lock_inode_wait(state->inode, request);
7100                 up_read(&nfsi->rwsem);
7101                 mutex_unlock(&sp->so_delegreturn_mutex);
7102                 goto out;
7103         }
7104         up_read(&nfsi->rwsem);
7105         mutex_unlock(&sp->so_delegreturn_mutex);
7106         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7107 out:
7108         request->fl_flags = fl_flags;
7109         return status;
7110 }
7111
7112 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7113 {
7114         struct nfs4_exception exception = {
7115                 .state = state,
7116                 .inode = state->inode,
7117                 .interruptible = true,
7118         };
7119         int err;
7120
7121         do {
7122                 err = _nfs4_proc_setlk(state, cmd, request);
7123                 if (err == -NFS4ERR_DENIED)
7124                         err = -EAGAIN;
7125                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7126                                 err, &exception);
7127         } while (exception.retry);
7128         return err;
7129 }
7130
7131 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7132 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7133
7134 static int
7135 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7136                         struct file_lock *request)
7137 {
7138         int             status = -ERESTARTSYS;
7139         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7140
7141         while(!signalled()) {
7142                 status = nfs4_proc_setlk(state, cmd, request);
7143                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7144                         break;
7145                 freezable_schedule_timeout_interruptible(timeout);
7146                 timeout *= 2;
7147                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7148                 status = -ERESTARTSYS;
7149         }
7150         return status;
7151 }
7152
7153 #ifdef CONFIG_NFS_V4_1
7154 struct nfs4_lock_waiter {
7155         struct task_struct      *task;
7156         struct inode            *inode;
7157         struct nfs_lowner       *owner;
7158 };
7159
7160 static int
7161 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7162 {
7163         int ret;
7164         struct nfs4_lock_waiter *waiter = wait->private;
7165
7166         /* NULL key means to wake up everyone */
7167         if (key) {
7168                 struct cb_notify_lock_args      *cbnl = key;
7169                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7170                                                 *wowner = waiter->owner;
7171
7172                 /* Only wake if the callback was for the same owner. */
7173                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7174                         return 0;
7175
7176                 /* Make sure it's for the right inode */
7177                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7178                         return 0;
7179         }
7180
7181         /* override "private" so we can use default_wake_function */
7182         wait->private = waiter->task;
7183         ret = woken_wake_function(wait, mode, flags, key);
7184         if (ret)
7185                 list_del_init(&wait->entry);
7186         wait->private = waiter;
7187         return ret;
7188 }
7189
7190 static int
7191 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7192 {
7193         int status = -ERESTARTSYS;
7194         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7195         struct nfs_server *server = NFS_SERVER(state->inode);
7196         struct nfs_client *clp = server->nfs_client;
7197         wait_queue_head_t *q = &clp->cl_lock_waitq;
7198         struct nfs_lowner owner = { .clientid = clp->cl_clientid,
7199                                     .id = lsp->ls_seqid.owner_id,
7200                                     .s_dev = server->s_dev };
7201         struct nfs4_lock_waiter waiter = { .task  = current,
7202                                            .inode = state->inode,
7203                                            .owner = &owner};
7204         wait_queue_entry_t wait;
7205
7206         /* Don't bother with waitqueue if we don't expect a callback */
7207         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7208                 return nfs4_retry_setlk_simple(state, cmd, request);
7209
7210         init_wait(&wait);
7211         wait.private = &waiter;
7212         wait.func = nfs4_wake_lock_waiter;
7213
7214         while(!signalled()) {
7215                 add_wait_queue(q, &wait);
7216                 status = nfs4_proc_setlk(state, cmd, request);
7217                 if ((status != -EAGAIN) || IS_SETLK(cmd)) {
7218                         finish_wait(q, &wait);
7219                         break;
7220                 }
7221
7222                 status = -ERESTARTSYS;
7223                 freezer_do_not_count();
7224                 wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT);
7225                 freezer_count();
7226                 finish_wait(q, &wait);
7227         }
7228
7229         return status;
7230 }
7231 #else /* !CONFIG_NFS_V4_1 */
7232 static inline int
7233 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7234 {
7235         return nfs4_retry_setlk_simple(state, cmd, request);
7236 }
7237 #endif
7238
7239 static int
7240 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7241 {
7242         struct nfs_open_context *ctx;
7243         struct nfs4_state *state;
7244         int status;
7245
7246         /* verify open state */
7247         ctx = nfs_file_open_context(filp);
7248         state = ctx->state;
7249
7250         if (IS_GETLK(cmd)) {
7251                 if (state != NULL)
7252                         return nfs4_proc_getlk(state, F_GETLK, request);
7253                 return 0;
7254         }
7255
7256         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7257                 return -EINVAL;
7258
7259         if (request->fl_type == F_UNLCK) {
7260                 if (state != NULL)
7261                         return nfs4_proc_unlck(state, cmd, request);
7262                 return 0;
7263         }
7264
7265         if (state == NULL)
7266                 return -ENOLCK;
7267
7268         if ((request->fl_flags & FL_POSIX) &&
7269             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7270                 return -ENOLCK;
7271
7272         /*
7273          * Don't rely on the VFS having checked the file open mode,
7274          * since it won't do this for flock() locks.
7275          */
7276         switch (request->fl_type) {
7277         case F_RDLCK:
7278                 if (!(filp->f_mode & FMODE_READ))
7279                         return -EBADF;
7280                 break;
7281         case F_WRLCK:
7282                 if (!(filp->f_mode & FMODE_WRITE))
7283                         return -EBADF;
7284         }
7285
7286         status = nfs4_set_lock_state(state, request);
7287         if (status != 0)
7288                 return status;
7289
7290         return nfs4_retry_setlk(state, cmd, request);
7291 }
7292
7293 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7294 {
7295         struct nfs_server *server = NFS_SERVER(state->inode);
7296         int err;
7297
7298         err = nfs4_set_lock_state(state, fl);
7299         if (err != 0)
7300                 return err;
7301         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7302         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7303 }
7304
7305 struct nfs_release_lockowner_data {
7306         struct nfs4_lock_state *lsp;
7307         struct nfs_server *server;
7308         struct nfs_release_lockowner_args args;
7309         struct nfs_release_lockowner_res res;
7310         unsigned long timestamp;
7311 };
7312
7313 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7314 {
7315         struct nfs_release_lockowner_data *data = calldata;
7316         struct nfs_server *server = data->server;
7317         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7318                            &data->res.seq_res, task);
7319         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7320         data->timestamp = jiffies;
7321 }
7322
7323 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7324 {
7325         struct nfs_release_lockowner_data *data = calldata;
7326         struct nfs_server *server = data->server;
7327
7328         nfs40_sequence_done(task, &data->res.seq_res);
7329
7330         switch (task->tk_status) {
7331         case 0:
7332                 renew_lease(server, data->timestamp);
7333                 break;
7334         case -NFS4ERR_STALE_CLIENTID:
7335         case -NFS4ERR_EXPIRED:
7336                 nfs4_schedule_lease_recovery(server->nfs_client);
7337                 break;
7338         case -NFS4ERR_LEASE_MOVED:
7339         case -NFS4ERR_DELAY:
7340                 if (nfs4_async_handle_error(task, server,
7341                                             NULL, NULL) == -EAGAIN)
7342                         rpc_restart_call_prepare(task);
7343         }
7344 }
7345
7346 static void nfs4_release_lockowner_release(void *calldata)
7347 {
7348         struct nfs_release_lockowner_data *data = calldata;
7349         nfs4_free_lock_state(data->server, data->lsp);
7350         kfree(calldata);
7351 }
7352
7353 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7354         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7355         .rpc_call_done = nfs4_release_lockowner_done,
7356         .rpc_release = nfs4_release_lockowner_release,
7357 };
7358
7359 static void
7360 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7361 {
7362         struct nfs_release_lockowner_data *data;
7363         struct rpc_message msg = {
7364                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7365         };
7366
7367         if (server->nfs_client->cl_mvops->minor_version != 0)
7368                 return;
7369
7370         data = kmalloc(sizeof(*data), GFP_NOFS);
7371         if (!data)
7372                 return;
7373         data->lsp = lsp;
7374         data->server = server;
7375         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7376         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7377         data->args.lock_owner.s_dev = server->s_dev;
7378
7379         msg.rpc_argp = &data->args;
7380         msg.rpc_resp = &data->res;
7381         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7382         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7383 }
7384
7385 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7386
7387 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7388                                    struct dentry *unused, struct inode *inode,
7389                                    const char *key, const void *buf,
7390                                    size_t buflen, int flags)
7391 {
7392         return nfs4_proc_set_acl(inode, buf, buflen);
7393 }
7394
7395 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7396                                    struct dentry *unused, struct inode *inode,
7397                                    const char *key, void *buf, size_t buflen)
7398 {
7399         return nfs4_proc_get_acl(inode, buf, buflen);
7400 }
7401
7402 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7403 {
7404         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
7405 }
7406
7407 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7408
7409 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7410                                      struct dentry *unused, struct inode *inode,
7411                                      const char *key, const void *buf,
7412                                      size_t buflen, int flags)
7413 {
7414         if (security_ismaclabel(key))
7415                 return nfs4_set_security_label(inode, buf, buflen);
7416
7417         return -EOPNOTSUPP;
7418 }
7419
7420 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7421                                      struct dentry *unused, struct inode *inode,
7422                                      const char *key, void *buf, size_t buflen)
7423 {
7424         if (security_ismaclabel(key))
7425                 return nfs4_get_security_label(inode, buf, buflen);
7426         return -EOPNOTSUPP;
7427 }
7428
7429 static ssize_t
7430 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7431 {
7432         int len = 0;
7433
7434         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7435                 len = security_inode_listsecurity(inode, list, list_len);
7436                 if (list_len && len > list_len)
7437                         return -ERANGE;
7438         }
7439         return len;
7440 }
7441
7442 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7443         .prefix = XATTR_SECURITY_PREFIX,
7444         .get    = nfs4_xattr_get_nfs4_label,
7445         .set    = nfs4_xattr_set_nfs4_label,
7446 };
7447
7448 #else
7449
7450 static ssize_t
7451 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7452 {
7453         return 0;
7454 }
7455
7456 #endif
7457
7458 #ifdef CONFIG_NFS_V4_2
7459 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7460                                     struct dentry *unused, struct inode *inode,
7461                                     const char *key, const void *buf,
7462                                     size_t buflen, int flags)
7463 {
7464         struct nfs_access_entry cache;
7465         int ret;
7466
7467         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7468                 return -EOPNOTSUPP;
7469
7470         /*
7471          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7472          * flags right now. Handling of xattr operations use the normal
7473          * file read/write permissions.
7474          *
7475          * Just in case the server has other ideas (which RFC 8276 allows),
7476          * do a cached access check for the XA* flags to possibly avoid
7477          * doing an RPC and getting EACCES back.
7478          */
7479         if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7480                 if (!(cache.mask & NFS_ACCESS_XAWRITE))
7481                         return -EACCES;
7482         }
7483
7484         if (buf == NULL) {
7485                 ret = nfs42_proc_removexattr(inode, key);
7486                 if (!ret)
7487                         nfs4_xattr_cache_remove(inode, key);
7488         } else {
7489                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7490                 if (!ret)
7491                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7492         }
7493
7494         return ret;
7495 }
7496
7497 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7498                                     struct dentry *unused, struct inode *inode,
7499                                     const char *key, void *buf, size_t buflen)
7500 {
7501         struct nfs_access_entry cache;
7502         ssize_t ret;
7503
7504         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7505                 return -EOPNOTSUPP;
7506
7507         if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7508                 if (!(cache.mask & NFS_ACCESS_XAREAD))
7509                         return -EACCES;
7510         }
7511
7512         ret = nfs_revalidate_inode(NFS_SERVER(inode), inode);
7513         if (ret)
7514                 return ret;
7515
7516         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7517         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7518                 return ret;
7519
7520         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7521
7522         return ret;
7523 }
7524
7525 static ssize_t
7526 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7527 {
7528         u64 cookie;
7529         bool eof;
7530         ssize_t ret, size;
7531         char *buf;
7532         size_t buflen;
7533         struct nfs_access_entry cache;
7534
7535         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7536                 return 0;
7537
7538         if (!nfs_access_get_cached(inode, current_cred(), &cache, true)) {
7539                 if (!(cache.mask & NFS_ACCESS_XALIST))
7540                         return 0;
7541         }
7542
7543         ret = nfs_revalidate_inode(NFS_SERVER(inode), inode);
7544         if (ret)
7545                 return ret;
7546
7547         ret = nfs4_xattr_cache_list(inode, list, list_len);
7548         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7549                 return ret;
7550
7551         cookie = 0;
7552         eof = false;
7553         buflen = list_len ? list_len : XATTR_LIST_MAX;
7554         buf = list_len ? list : NULL;
7555         size = 0;
7556
7557         while (!eof) {
7558                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7559                     &cookie, &eof);
7560                 if (ret < 0)
7561                         return ret;
7562
7563                 if (list_len) {
7564                         buf += ret;
7565                         buflen -= ret;
7566                 }
7567                 size += ret;
7568         }
7569
7570         if (list_len)
7571                 nfs4_xattr_cache_set_list(inode, list, size);
7572
7573         return size;
7574 }
7575
7576 #else
7577
7578 static ssize_t
7579 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7580 {
7581         return 0;
7582 }
7583 #endif /* CONFIG_NFS_V4_2 */
7584
7585 /*
7586  * nfs_fhget will use either the mounted_on_fileid or the fileid
7587  */
7588 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7589 {
7590         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7591                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7592               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7593               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7594                 return;
7595
7596         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7597                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7598         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7599         fattr->nlink = 2;
7600 }
7601
7602 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7603                                    const struct qstr *name,
7604                                    struct nfs4_fs_locations *fs_locations,
7605                                    struct page *page)
7606 {
7607         struct nfs_server *server = NFS_SERVER(dir);
7608         u32 bitmask[3];
7609         struct nfs4_fs_locations_arg args = {
7610                 .dir_fh = NFS_FH(dir),
7611                 .name = name,
7612                 .page = page,
7613                 .bitmask = bitmask,
7614         };
7615         struct nfs4_fs_locations_res res = {
7616                 .fs_locations = fs_locations,
7617         };
7618         struct rpc_message msg = {
7619                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7620                 .rpc_argp = &args,
7621                 .rpc_resp = &res,
7622         };
7623         int status;
7624
7625         dprintk("%s: start\n", __func__);
7626
7627         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7628         bitmask[1] = nfs4_fattr_bitmap[1];
7629
7630         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7631          * is not supported */
7632         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7633                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7634         else
7635                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7636
7637         nfs_fattr_init(&fs_locations->fattr);
7638         fs_locations->server = server;
7639         fs_locations->nlocations = 0;
7640         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7641         dprintk("%s: returned status = %d\n", __func__, status);
7642         return status;
7643 }
7644
7645 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7646                            const struct qstr *name,
7647                            struct nfs4_fs_locations *fs_locations,
7648                            struct page *page)
7649 {
7650         struct nfs4_exception exception = {
7651                 .interruptible = true,
7652         };
7653         int err;
7654         do {
7655                 err = _nfs4_proc_fs_locations(client, dir, name,
7656                                 fs_locations, page);
7657                 trace_nfs4_get_fs_locations(dir, name, err);
7658                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7659                                 &exception);
7660         } while (exception.retry);
7661         return err;
7662 }
7663
7664 /*
7665  * This operation also signals the server that this client is
7666  * performing migration recovery.  The server can stop returning
7667  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
7668  * appended to this compound to identify the client ID which is
7669  * performing recovery.
7670  */
7671 static int _nfs40_proc_get_locations(struct inode *inode,
7672                                      struct nfs4_fs_locations *locations,
7673                                      struct page *page, const struct cred *cred)
7674 {
7675         struct nfs_server *server = NFS_SERVER(inode);
7676         struct rpc_clnt *clnt = server->client;
7677         u32 bitmask[2] = {
7678                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7679         };
7680         struct nfs4_fs_locations_arg args = {
7681                 .clientid       = server->nfs_client->cl_clientid,
7682                 .fh             = NFS_FH(inode),
7683                 .page           = page,
7684                 .bitmask        = bitmask,
7685                 .migration      = 1,            /* skip LOOKUP */
7686                 .renew          = 1,            /* append RENEW */
7687         };
7688         struct nfs4_fs_locations_res res = {
7689                 .fs_locations   = locations,
7690                 .migration      = 1,
7691                 .renew          = 1,
7692         };
7693         struct rpc_message msg = {
7694                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7695                 .rpc_argp       = &args,
7696                 .rpc_resp       = &res,
7697                 .rpc_cred       = cred,
7698         };
7699         unsigned long now = jiffies;
7700         int status;
7701
7702         nfs_fattr_init(&locations->fattr);
7703         locations->server = server;
7704         locations->nlocations = 0;
7705
7706         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7707         status = nfs4_call_sync_sequence(clnt, server, &msg,
7708                                         &args.seq_args, &res.seq_res);
7709         if (status)
7710                 return status;
7711
7712         renew_lease(server, now);
7713         return 0;
7714 }
7715
7716 #ifdef CONFIG_NFS_V4_1
7717
7718 /*
7719  * This operation also signals the server that this client is
7720  * performing migration recovery.  The server can stop asserting
7721  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
7722  * performing this operation is identified in the SEQUENCE
7723  * operation in this compound.
7724  *
7725  * When the client supports GETATTR(fs_locations_info), it can
7726  * be plumbed in here.
7727  */
7728 static int _nfs41_proc_get_locations(struct inode *inode,
7729                                      struct nfs4_fs_locations *locations,
7730                                      struct page *page, const struct cred *cred)
7731 {
7732         struct nfs_server *server = NFS_SERVER(inode);
7733         struct rpc_clnt *clnt = server->client;
7734         u32 bitmask[2] = {
7735                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7736         };
7737         struct nfs4_fs_locations_arg args = {
7738                 .fh             = NFS_FH(inode),
7739                 .page           = page,
7740                 .bitmask        = bitmask,
7741                 .migration      = 1,            /* skip LOOKUP */
7742         };
7743         struct nfs4_fs_locations_res res = {
7744                 .fs_locations   = locations,
7745                 .migration      = 1,
7746         };
7747         struct rpc_message msg = {
7748                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7749                 .rpc_argp       = &args,
7750                 .rpc_resp       = &res,
7751                 .rpc_cred       = cred,
7752         };
7753         int status;
7754
7755         nfs_fattr_init(&locations->fattr);
7756         locations->server = server;
7757         locations->nlocations = 0;
7758
7759         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7760         status = nfs4_call_sync_sequence(clnt, server, &msg,
7761                                         &args.seq_args, &res.seq_res);
7762         if (status == NFS4_OK &&
7763             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7764                 status = -NFS4ERR_LEASE_MOVED;
7765         return status;
7766 }
7767
7768 #endif  /* CONFIG_NFS_V4_1 */
7769
7770 /**
7771  * nfs4_proc_get_locations - discover locations for a migrated FSID
7772  * @inode: inode on FSID that is migrating
7773  * @locations: result of query
7774  * @page: buffer
7775  * @cred: credential to use for this operation
7776  *
7777  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
7778  * operation failed, or a negative errno if a local error occurred.
7779  *
7780  * On success, "locations" is filled in, but if the server has
7781  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
7782  * asserted.
7783  *
7784  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
7785  * from this client that require migration recovery.
7786  */
7787 int nfs4_proc_get_locations(struct inode *inode,
7788                             struct nfs4_fs_locations *locations,
7789                             struct page *page, const struct cred *cred)
7790 {
7791         struct nfs_server *server = NFS_SERVER(inode);
7792         struct nfs_client *clp = server->nfs_client;
7793         const struct nfs4_mig_recovery_ops *ops =
7794                                         clp->cl_mvops->mig_recovery_ops;
7795         struct nfs4_exception exception = {
7796                 .interruptible = true,
7797         };
7798         int status;
7799
7800         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7801                 (unsigned long long)server->fsid.major,
7802                 (unsigned long long)server->fsid.minor,
7803                 clp->cl_hostname);
7804         nfs_display_fhandle(NFS_FH(inode), __func__);
7805
7806         do {
7807                 status = ops->get_locations(inode, locations, page, cred);
7808                 if (status != -NFS4ERR_DELAY)
7809                         break;
7810                 nfs4_handle_exception(server, status, &exception);
7811         } while (exception.retry);
7812         return status;
7813 }
7814
7815 /*
7816  * This operation also signals the server that this client is
7817  * performing "lease moved" recovery.  The server can stop
7818  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
7819  * is appended to this compound to identify the client ID which is
7820  * performing recovery.
7821  */
7822 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
7823 {
7824         struct nfs_server *server = NFS_SERVER(inode);
7825         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
7826         struct rpc_clnt *clnt = server->client;
7827         struct nfs4_fsid_present_arg args = {
7828                 .fh             = NFS_FH(inode),
7829                 .clientid       = clp->cl_clientid,
7830                 .renew          = 1,            /* append RENEW */
7831         };
7832         struct nfs4_fsid_present_res res = {
7833                 .renew          = 1,
7834         };
7835         struct rpc_message msg = {
7836                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7837                 .rpc_argp       = &args,
7838                 .rpc_resp       = &res,
7839                 .rpc_cred       = cred,
7840         };
7841         unsigned long now = jiffies;
7842         int status;
7843
7844         res.fh = nfs_alloc_fhandle();
7845         if (res.fh == NULL)
7846                 return -ENOMEM;
7847
7848         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7849         status = nfs4_call_sync_sequence(clnt, server, &msg,
7850                                                 &args.seq_args, &res.seq_res);
7851         nfs_free_fhandle(res.fh);
7852         if (status)
7853                 return status;
7854
7855         do_renew_lease(clp, now);
7856         return 0;
7857 }
7858
7859 #ifdef CONFIG_NFS_V4_1
7860
7861 /*
7862  * This operation also signals the server that this client is
7863  * performing "lease moved" recovery.  The server can stop asserting
7864  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
7865  * this operation is identified in the SEQUENCE operation in this
7866  * compound.
7867  */
7868 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
7869 {
7870         struct nfs_server *server = NFS_SERVER(inode);
7871         struct rpc_clnt *clnt = server->client;
7872         struct nfs4_fsid_present_arg args = {
7873                 .fh             = NFS_FH(inode),
7874         };
7875         struct nfs4_fsid_present_res res = {
7876         };
7877         struct rpc_message msg = {
7878                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7879                 .rpc_argp       = &args,
7880                 .rpc_resp       = &res,
7881                 .rpc_cred       = cred,
7882         };
7883         int status;
7884
7885         res.fh = nfs_alloc_fhandle();
7886         if (res.fh == NULL)
7887                 return -ENOMEM;
7888
7889         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7890         status = nfs4_call_sync_sequence(clnt, server, &msg,
7891                                                 &args.seq_args, &res.seq_res);
7892         nfs_free_fhandle(res.fh);
7893         if (status == NFS4_OK &&
7894             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7895                 status = -NFS4ERR_LEASE_MOVED;
7896         return status;
7897 }
7898
7899 #endif  /* CONFIG_NFS_V4_1 */
7900
7901 /**
7902  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
7903  * @inode: inode on FSID to check
7904  * @cred: credential to use for this operation
7905  *
7906  * Server indicates whether the FSID is present, moved, or not
7907  * recognized.  This operation is necessary to clear a LEASE_MOVED
7908  * condition for this client ID.
7909  *
7910  * Returns NFS4_OK if the FSID is present on this server,
7911  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
7912  *  NFS4ERR code if some error occurred on the server, or a
7913  *  negative errno if a local failure occurred.
7914  */
7915 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
7916 {
7917         struct nfs_server *server = NFS_SERVER(inode);
7918         struct nfs_client *clp = server->nfs_client;
7919         const struct nfs4_mig_recovery_ops *ops =
7920                                         clp->cl_mvops->mig_recovery_ops;
7921         struct nfs4_exception exception = {
7922                 .interruptible = true,
7923         };
7924         int status;
7925
7926         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7927                 (unsigned long long)server->fsid.major,
7928                 (unsigned long long)server->fsid.minor,
7929                 clp->cl_hostname);
7930         nfs_display_fhandle(NFS_FH(inode), __func__);
7931
7932         do {
7933                 status = ops->fsid_present(inode, cred);
7934                 if (status != -NFS4ERR_DELAY)
7935                         break;
7936                 nfs4_handle_exception(server, status, &exception);
7937         } while (exception.retry);
7938         return status;
7939 }
7940
7941 /*
7942  * If 'use_integrity' is true and the state managment nfs_client
7943  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
7944  * and the machine credential as per RFC3530bis and RFC5661 Security
7945  * Considerations sections. Otherwise, just use the user cred with the
7946  * filesystem's rpc_client.
7947  */
7948 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7949 {
7950         int status;
7951         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
7952         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
7953         struct nfs4_secinfo_arg args = {
7954                 .dir_fh = NFS_FH(dir),
7955                 .name   = name,
7956         };
7957         struct nfs4_secinfo_res res = {
7958                 .flavors     = flavors,
7959         };
7960         struct rpc_message msg = {
7961                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
7962                 .rpc_argp = &args,
7963                 .rpc_resp = &res,
7964         };
7965         struct nfs4_call_sync_data data = {
7966                 .seq_server = NFS_SERVER(dir),
7967                 .seq_args = &args.seq_args,
7968                 .seq_res = &res.seq_res,
7969         };
7970         struct rpc_task_setup task_setup = {
7971                 .rpc_client = clnt,
7972                 .rpc_message = &msg,
7973                 .callback_ops = clp->cl_mvops->call_sync_ops,
7974                 .callback_data = &data,
7975                 .flags = RPC_TASK_NO_ROUND_ROBIN,
7976         };
7977         const struct cred *cred = NULL;
7978
7979         if (use_integrity) {
7980                 clnt = clp->cl_rpcclient;
7981                 task_setup.rpc_client = clnt;
7982
7983                 cred = nfs4_get_clid_cred(clp);
7984                 msg.rpc_cred = cred;
7985         }
7986
7987         dprintk("NFS call  secinfo %s\n", name->name);
7988
7989         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
7990         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
7991         status = nfs4_call_sync_custom(&task_setup);
7992
7993         dprintk("NFS reply  secinfo: %d\n", status);
7994
7995         put_cred(cred);
7996         return status;
7997 }
7998
7999 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8000                       struct nfs4_secinfo_flavors *flavors)
8001 {
8002         struct nfs4_exception exception = {
8003                 .interruptible = true,
8004         };
8005         int err;
8006         do {
8007                 err = -NFS4ERR_WRONGSEC;
8008
8009                 /* try to use integrity protection with machine cred */
8010                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8011                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8012
8013                 /*
8014                  * if unable to use integrity protection, or SECINFO with
8015                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8016                  * disallowed by spec, but exists in deployed servers) use
8017                  * the current filesystem's rpc_client and the user cred.
8018                  */
8019                 if (err == -NFS4ERR_WRONGSEC)
8020                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8021
8022                 trace_nfs4_secinfo(dir, name, err);
8023                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8024                                 &exception);
8025         } while (exception.retry);
8026         return err;
8027 }
8028
8029 #ifdef CONFIG_NFS_V4_1
8030 /*
8031  * Check the exchange flags returned by the server for invalid flags, having
8032  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8033  * DS flags set.
8034  */
8035 static int nfs4_check_cl_exchange_flags(u32 flags)
8036 {
8037         if (flags & ~EXCHGID4_FLAG_MASK_R)
8038                 goto out_inval;
8039         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8040             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8041                 goto out_inval;
8042         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8043                 goto out_inval;
8044         return NFS_OK;
8045 out_inval:
8046         return -NFS4ERR_INVAL;
8047 }
8048
8049 static bool
8050 nfs41_same_server_scope(struct nfs41_server_scope *a,
8051                         struct nfs41_server_scope *b)
8052 {
8053         if (a->server_scope_sz != b->server_scope_sz)
8054                 return false;
8055         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8056 }
8057
8058 static void
8059 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8060 {
8061         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8062         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8063         struct nfs_client *clp = args->client;
8064
8065         switch (task->tk_status) {
8066         case -NFS4ERR_BADSESSION:
8067         case -NFS4ERR_DEADSESSION:
8068                 nfs4_schedule_session_recovery(clp->cl_session,
8069                                 task->tk_status);
8070         }
8071         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8072                         res->dir != NFS4_CDFS4_BOTH) {
8073                 rpc_task_close_connection(task);
8074                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8075                         rpc_restart_call(task);
8076         }
8077 }
8078
8079 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8080         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8081 };
8082
8083 /*
8084  * nfs4_proc_bind_one_conn_to_session()
8085  *
8086  * The 4.1 client currently uses the same TCP connection for the
8087  * fore and backchannel.
8088  */
8089 static
8090 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8091                 struct rpc_xprt *xprt,
8092                 struct nfs_client *clp,
8093                 const struct cred *cred)
8094 {
8095         int status;
8096         struct nfs41_bind_conn_to_session_args args = {
8097                 .client = clp,
8098                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8099                 .retries = 0,
8100         };
8101         struct nfs41_bind_conn_to_session_res res;
8102         struct rpc_message msg = {
8103                 .rpc_proc =
8104                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8105                 .rpc_argp = &args,
8106                 .rpc_resp = &res,
8107                 .rpc_cred = cred,
8108         };
8109         struct rpc_task_setup task_setup_data = {
8110                 .rpc_client = clnt,
8111                 .rpc_xprt = xprt,
8112                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8113                 .rpc_message = &msg,
8114                 .flags = RPC_TASK_TIMEOUT,
8115         };
8116         struct rpc_task *task;
8117
8118         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8119         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8120                 args.dir = NFS4_CDFC4_FORE;
8121
8122         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8123         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8124                 args.dir = NFS4_CDFC4_FORE;
8125
8126         task = rpc_run_task(&task_setup_data);
8127         if (!IS_ERR(task)) {
8128                 status = task->tk_status;
8129                 rpc_put_task(task);
8130         } else
8131                 status = PTR_ERR(task);
8132         trace_nfs4_bind_conn_to_session(clp, status);
8133         if (status == 0) {
8134                 if (memcmp(res.sessionid.data,
8135                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8136                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8137                         return -EIO;
8138                 }
8139                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8140                         dprintk("NFS: %s: Unexpected direction from server\n",
8141                                 __func__);
8142                         return -EIO;
8143                 }
8144                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8145                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8146                                 __func__);
8147                         return -EIO;
8148                 }
8149         }
8150
8151         return status;
8152 }
8153
8154 struct rpc_bind_conn_calldata {
8155         struct nfs_client *clp;
8156         const struct cred *cred;
8157 };
8158
8159 static int
8160 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8161                 struct rpc_xprt *xprt,
8162                 void *calldata)
8163 {
8164         struct rpc_bind_conn_calldata *p = calldata;
8165
8166         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8167 }
8168
8169 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8170 {
8171         struct rpc_bind_conn_calldata data = {
8172                 .clp = clp,
8173                 .cred = cred,
8174         };
8175         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8176                         nfs4_proc_bind_conn_to_session_callback, &data);
8177 }
8178
8179 /*
8180  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8181  * and operations we'd like to see to enable certain features in the allow map
8182  */
8183 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8184         .how = SP4_MACH_CRED,
8185         .enforce.u.words = {
8186                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8187                       1 << (OP_EXCHANGE_ID - 32) |
8188                       1 << (OP_CREATE_SESSION - 32) |
8189                       1 << (OP_DESTROY_SESSION - 32) |
8190                       1 << (OP_DESTROY_CLIENTID - 32)
8191         },
8192         .allow.u.words = {
8193                 [0] = 1 << (OP_CLOSE) |
8194                       1 << (OP_OPEN_DOWNGRADE) |
8195                       1 << (OP_LOCKU) |
8196                       1 << (OP_DELEGRETURN) |
8197                       1 << (OP_COMMIT),
8198                 [1] = 1 << (OP_SECINFO - 32) |
8199                       1 << (OP_SECINFO_NO_NAME - 32) |
8200                       1 << (OP_LAYOUTRETURN - 32) |
8201                       1 << (OP_TEST_STATEID - 32) |
8202                       1 << (OP_FREE_STATEID - 32) |
8203                       1 << (OP_WRITE - 32)
8204         }
8205 };
8206
8207 /*
8208  * Select the state protection mode for client `clp' given the server results
8209  * from exchange_id in `sp'.
8210  *
8211  * Returns 0 on success, negative errno otherwise.
8212  */
8213 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8214                                  struct nfs41_state_protection *sp)
8215 {
8216         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8217                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8218                       1 << (OP_EXCHANGE_ID - 32) |
8219                       1 << (OP_CREATE_SESSION - 32) |
8220                       1 << (OP_DESTROY_SESSION - 32) |
8221                       1 << (OP_DESTROY_CLIENTID - 32)
8222         };
8223         unsigned long flags = 0;
8224         unsigned int i;
8225         int ret = 0;
8226
8227         if (sp->how == SP4_MACH_CRED) {
8228                 /* Print state protect result */
8229                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8230                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8231                         if (test_bit(i, sp->enforce.u.longs))
8232                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8233                         if (test_bit(i, sp->allow.u.longs))
8234                                 dfprintk(MOUNT, "  allow op %d\n", i);
8235                 }
8236
8237                 /* make sure nothing is on enforce list that isn't supported */
8238                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8239                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8240                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8241                                 ret = -EINVAL;
8242                                 goto out;
8243                         }
8244                 }
8245
8246                 /*
8247                  * Minimal mode - state operations are allowed to use machine
8248                  * credential.  Note this already happens by default, so the
8249                  * client doesn't have to do anything more than the negotiation.
8250                  *
8251                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8252                  *       we're already using the machine cred for exchange_id
8253                  *       and will never use a different cred.
8254                  */
8255                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8256                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8257                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8258                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8259                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8260                         dfprintk(MOUNT, "  minimal mode enabled\n");
8261                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8262                 } else {
8263                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8264                         ret = -EINVAL;
8265                         goto out;
8266                 }
8267
8268                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8269                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8270                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8271                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8272                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8273                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8274                 }
8275
8276                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8277                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8278                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8279                 }
8280
8281                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8282                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8283                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8284                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8285                 }
8286
8287                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8288                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8289                         dfprintk(MOUNT, "  stateid mode enabled\n");
8290                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8291                 }
8292
8293                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8294                         dfprintk(MOUNT, "  write mode enabled\n");
8295                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8296                 }
8297
8298                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8299                         dfprintk(MOUNT, "  commit mode enabled\n");
8300                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8301                 }
8302         }
8303 out:
8304         clp->cl_sp4_flags = flags;
8305         return ret;
8306 }
8307
8308 struct nfs41_exchange_id_data {
8309         struct nfs41_exchange_id_res res;
8310         struct nfs41_exchange_id_args args;
8311 };
8312
8313 static void nfs4_exchange_id_release(void *data)
8314 {
8315         struct nfs41_exchange_id_data *cdata =
8316                                         (struct nfs41_exchange_id_data *)data;
8317
8318         nfs_put_client(cdata->args.client);
8319         kfree(cdata->res.impl_id);
8320         kfree(cdata->res.server_scope);
8321         kfree(cdata->res.server_owner);
8322         kfree(cdata);
8323 }
8324
8325 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8326         .rpc_release = nfs4_exchange_id_release,
8327 };
8328
8329 /*
8330  * _nfs4_proc_exchange_id()
8331  *
8332  * Wrapper for EXCHANGE_ID operation.
8333  */
8334 static struct rpc_task *
8335 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8336                         u32 sp4_how, struct rpc_xprt *xprt)
8337 {
8338         struct rpc_message msg = {
8339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8340                 .rpc_cred = cred,
8341         };
8342         struct rpc_task_setup task_setup_data = {
8343                 .rpc_client = clp->cl_rpcclient,
8344                 .callback_ops = &nfs4_exchange_id_call_ops,
8345                 .rpc_message = &msg,
8346                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8347         };
8348         struct nfs41_exchange_id_data *calldata;
8349         int status;
8350
8351         if (!refcount_inc_not_zero(&clp->cl_count))
8352                 return ERR_PTR(-EIO);
8353
8354         status = -ENOMEM;
8355         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8356         if (!calldata)
8357                 goto out;
8358
8359         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8360
8361         status = nfs4_init_uniform_client_string(clp);
8362         if (status)
8363                 goto out_calldata;
8364
8365         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8366                                                 GFP_NOFS);
8367         status = -ENOMEM;
8368         if (unlikely(calldata->res.server_owner == NULL))
8369                 goto out_calldata;
8370
8371         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8372                                         GFP_NOFS);
8373         if (unlikely(calldata->res.server_scope == NULL))
8374                 goto out_server_owner;
8375
8376         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8377         if (unlikely(calldata->res.impl_id == NULL))
8378                 goto out_server_scope;
8379
8380         switch (sp4_how) {
8381         case SP4_NONE:
8382                 calldata->args.state_protect.how = SP4_NONE;
8383                 break;
8384
8385         case SP4_MACH_CRED:
8386                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8387                 break;
8388
8389         default:
8390                 /* unsupported! */
8391                 WARN_ON_ONCE(1);
8392                 status = -EINVAL;
8393                 goto out_impl_id;
8394         }
8395         if (xprt) {
8396                 task_setup_data.rpc_xprt = xprt;
8397                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8398                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8399                                 sizeof(calldata->args.verifier.data));
8400         }
8401         calldata->args.client = clp;
8402         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8403         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8404 #ifdef CONFIG_NFS_V4_1_MIGRATION
8405         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8406 #endif
8407         msg.rpc_argp = &calldata->args;
8408         msg.rpc_resp = &calldata->res;
8409         task_setup_data.callback_data = calldata;
8410
8411         return rpc_run_task(&task_setup_data);
8412
8413 out_impl_id:
8414         kfree(calldata->res.impl_id);
8415 out_server_scope:
8416         kfree(calldata->res.server_scope);
8417 out_server_owner:
8418         kfree(calldata->res.server_owner);
8419 out_calldata:
8420         kfree(calldata);
8421 out:
8422         nfs_put_client(clp);
8423         return ERR_PTR(status);
8424 }
8425
8426 /*
8427  * _nfs4_proc_exchange_id()
8428  *
8429  * Wrapper for EXCHANGE_ID operation.
8430  */
8431 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8432                         u32 sp4_how)
8433 {
8434         struct rpc_task *task;
8435         struct nfs41_exchange_id_args *argp;
8436         struct nfs41_exchange_id_res *resp;
8437         unsigned long now = jiffies;
8438         int status;
8439
8440         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8441         if (IS_ERR(task))
8442                 return PTR_ERR(task);
8443
8444         argp = task->tk_msg.rpc_argp;
8445         resp = task->tk_msg.rpc_resp;
8446         status = task->tk_status;
8447         if (status  != 0)
8448                 goto out;
8449
8450         status = nfs4_check_cl_exchange_flags(resp->flags);
8451         if (status  != 0)
8452                 goto out;
8453
8454         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8455         if (status != 0)
8456                 goto out;
8457
8458         do_renew_lease(clp, now);
8459
8460         clp->cl_clientid = resp->clientid;
8461         clp->cl_exchange_flags = resp->flags;
8462         clp->cl_seqid = resp->seqid;
8463         /* Client ID is not confirmed */
8464         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8465                 clear_bit(NFS4_SESSION_ESTABLISHED,
8466                           &clp->cl_session->session_state);
8467
8468         if (clp->cl_serverscope != NULL &&
8469             !nfs41_same_server_scope(clp->cl_serverscope,
8470                                 resp->server_scope)) {
8471                 dprintk("%s: server_scope mismatch detected\n",
8472                         __func__);
8473                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8474         }
8475
8476         swap(clp->cl_serverowner, resp->server_owner);
8477         swap(clp->cl_serverscope, resp->server_scope);
8478         swap(clp->cl_implid, resp->impl_id);
8479
8480         /* Save the EXCHANGE_ID verifier session trunk tests */
8481         memcpy(clp->cl_confirm.data, argp->verifier.data,
8482                sizeof(clp->cl_confirm.data));
8483 out:
8484         trace_nfs4_exchange_id(clp, status);
8485         rpc_put_task(task);
8486         return status;
8487 }
8488
8489 /*
8490  * nfs4_proc_exchange_id()
8491  *
8492  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8493  *
8494  * Since the clientid has expired, all compounds using sessions
8495  * associated with the stale clientid will be returning
8496  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8497  * be in some phase of session reset.
8498  *
8499  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8500  */
8501 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8502 {
8503         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8504         int status;
8505
8506         /* try SP4_MACH_CRED if krb5i/p */
8507         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8508             authflavor == RPC_AUTH_GSS_KRB5P) {
8509                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8510                 if (!status)
8511                         return 0;
8512         }
8513
8514         /* try SP4_NONE */
8515         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8516 }
8517
8518 /**
8519  * nfs4_test_session_trunk
8520  *
8521  * This is an add_xprt_test() test function called from
8522  * rpc_clnt_setup_test_and_add_xprt.
8523  *
8524  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8525  * and is dereferrenced in nfs4_exchange_id_release
8526  *
8527  * Upon success, add the new transport to the rpc_clnt
8528  *
8529  * @clnt: struct rpc_clnt to get new transport
8530  * @xprt: the rpc_xprt to test
8531  * @data: call data for _nfs4_proc_exchange_id.
8532  */
8533 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8534                             void *data)
8535 {
8536         struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
8537         struct rpc_task *task;
8538         int status;
8539
8540         u32 sp4_how;
8541
8542         dprintk("--> %s try %s\n", __func__,
8543                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8544
8545         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8546
8547         /* Test connection for session trunking. Async exchange_id call */
8548         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8549         if (IS_ERR(task))
8550                 return;
8551
8552         status = task->tk_status;
8553         if (status == 0)
8554                 status = nfs4_detect_session_trunking(adata->clp,
8555                                 task->tk_msg.rpc_resp, xprt);
8556
8557         if (status == 0)
8558                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8559
8560         rpc_put_task(task);
8561 }
8562 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8563
8564 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8565                 const struct cred *cred)
8566 {
8567         struct rpc_message msg = {
8568                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8569                 .rpc_argp = clp,
8570                 .rpc_cred = cred,
8571         };
8572         int status;
8573
8574         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8575                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8576         trace_nfs4_destroy_clientid(clp, status);
8577         if (status)
8578                 dprintk("NFS: Got error %d from the server %s on "
8579                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8580         return status;
8581 }
8582
8583 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8584                 const struct cred *cred)
8585 {
8586         unsigned int loop;
8587         int ret;
8588
8589         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8590                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8591                 switch (ret) {
8592                 case -NFS4ERR_DELAY:
8593                 case -NFS4ERR_CLIENTID_BUSY:
8594                         ssleep(1);
8595                         break;
8596                 default:
8597                         return ret;
8598                 }
8599         }
8600         return 0;
8601 }
8602
8603 int nfs4_destroy_clientid(struct nfs_client *clp)
8604 {
8605         const struct cred *cred;
8606         int ret = 0;
8607
8608         if (clp->cl_mvops->minor_version < 1)
8609                 goto out;
8610         if (clp->cl_exchange_flags == 0)
8611                 goto out;
8612         if (clp->cl_preserve_clid)
8613                 goto out;
8614         cred = nfs4_get_clid_cred(clp);
8615         ret = nfs4_proc_destroy_clientid(clp, cred);
8616         put_cred(cred);
8617         switch (ret) {
8618         case 0:
8619         case -NFS4ERR_STALE_CLIENTID:
8620                 clp->cl_exchange_flags = 0;
8621         }
8622 out:
8623         return ret;
8624 }
8625
8626 #endif /* CONFIG_NFS_V4_1 */
8627
8628 struct nfs4_get_lease_time_data {
8629         struct nfs4_get_lease_time_args *args;
8630         struct nfs4_get_lease_time_res *res;
8631         struct nfs_client *clp;
8632 };
8633
8634 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
8635                                         void *calldata)
8636 {
8637         struct nfs4_get_lease_time_data *data =
8638                         (struct nfs4_get_lease_time_data *)calldata;
8639
8640         dprintk("--> %s\n", __func__);
8641         /* just setup sequence, do not trigger session recovery
8642            since we're invoked within one */
8643         nfs4_setup_sequence(data->clp,
8644                         &data->args->la_seq_args,
8645                         &data->res->lr_seq_res,
8646                         task);
8647         dprintk("<-- %s\n", __func__);
8648 }
8649
8650 /*
8651  * Called from nfs4_state_manager thread for session setup, so don't recover
8652  * from sequence operation or clientid errors.
8653  */
8654 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
8655 {
8656         struct nfs4_get_lease_time_data *data =
8657                         (struct nfs4_get_lease_time_data *)calldata;
8658
8659         dprintk("--> %s\n", __func__);
8660         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
8661                 return;
8662         switch (task->tk_status) {
8663         case -NFS4ERR_DELAY:
8664         case -NFS4ERR_GRACE:
8665                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
8666                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
8667                 task->tk_status = 0;
8668                 /* fall through */
8669         case -NFS4ERR_RETRY_UNCACHED_REP:
8670                 rpc_restart_call_prepare(task);
8671                 return;
8672         }
8673         dprintk("<-- %s\n", __func__);
8674 }
8675
8676 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
8677         .rpc_call_prepare = nfs4_get_lease_time_prepare,
8678         .rpc_call_done = nfs4_get_lease_time_done,
8679 };
8680
8681 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
8682 {
8683         struct nfs4_get_lease_time_args args;
8684         struct nfs4_get_lease_time_res res = {
8685                 .lr_fsinfo = fsinfo,
8686         };
8687         struct nfs4_get_lease_time_data data = {
8688                 .args = &args,
8689                 .res = &res,
8690                 .clp = clp,
8691         };
8692         struct rpc_message msg = {
8693                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
8694                 .rpc_argp = &args,
8695                 .rpc_resp = &res,
8696         };
8697         struct rpc_task_setup task_setup = {
8698                 .rpc_client = clp->cl_rpcclient,
8699                 .rpc_message = &msg,
8700                 .callback_ops = &nfs4_get_lease_time_ops,
8701                 .callback_data = &data,
8702                 .flags = RPC_TASK_TIMEOUT,
8703         };
8704
8705         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
8706         return nfs4_call_sync_custom(&task_setup);
8707 }
8708
8709 #ifdef CONFIG_NFS_V4_1
8710
8711 /*
8712  * Initialize the values to be used by the client in CREATE_SESSION
8713  * If nfs4_init_session set the fore channel request and response sizes,
8714  * use them.
8715  *
8716  * Set the back channel max_resp_sz_cached to zero to force the client to
8717  * always set csa_cachethis to FALSE because the current implementation
8718  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
8719  */
8720 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
8721                                     struct rpc_clnt *clnt)
8722 {
8723         unsigned int max_rqst_sz, max_resp_sz;
8724         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
8725         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
8726
8727         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
8728         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
8729
8730         /* Fore channel attributes */
8731         args->fc_attrs.max_rqst_sz = max_rqst_sz;
8732         args->fc_attrs.max_resp_sz = max_resp_sz;
8733         args->fc_attrs.max_ops = NFS4_MAX_OPS;
8734         args->fc_attrs.max_reqs = max_session_slots;
8735
8736         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
8737                 "max_ops=%u max_reqs=%u\n",
8738                 __func__,
8739                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
8740                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
8741
8742         /* Back channel attributes */
8743         args->bc_attrs.max_rqst_sz = max_bc_payload;
8744         args->bc_attrs.max_resp_sz = max_bc_payload;
8745         args->bc_attrs.max_resp_sz_cached = 0;
8746         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
8747         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
8748         if (args->bc_attrs.max_reqs > max_bc_slots)
8749                 args->bc_attrs.max_reqs = max_bc_slots;
8750
8751         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
8752                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
8753                 __func__,
8754                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
8755                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
8756                 args->bc_attrs.max_reqs);
8757 }
8758
8759 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
8760                 struct nfs41_create_session_res *res)
8761 {
8762         struct nfs4_channel_attrs *sent = &args->fc_attrs;
8763         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
8764
8765         if (rcvd->max_resp_sz > sent->max_resp_sz)
8766                 return -EINVAL;
8767         /*
8768          * Our requested max_ops is the minimum we need; we're not
8769          * prepared to break up compounds into smaller pieces than that.
8770          * So, no point even trying to continue if the server won't
8771          * cooperate:
8772          */
8773         if (rcvd->max_ops < sent->max_ops)
8774                 return -EINVAL;
8775         if (rcvd->max_reqs == 0)
8776                 return -EINVAL;
8777         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
8778                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
8779         return 0;
8780 }
8781
8782 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
8783                 struct nfs41_create_session_res *res)
8784 {
8785         struct nfs4_channel_attrs *sent = &args->bc_attrs;
8786         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
8787
8788         if (!(res->flags & SESSION4_BACK_CHAN))
8789                 goto out;
8790         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
8791                 return -EINVAL;
8792         if (rcvd->max_resp_sz < sent->max_resp_sz)
8793                 return -EINVAL;
8794         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
8795                 return -EINVAL;
8796         if (rcvd->max_ops > sent->max_ops)
8797                 return -EINVAL;
8798         if (rcvd->max_reqs > sent->max_reqs)
8799                 return -EINVAL;
8800 out:
8801         return 0;
8802 }
8803
8804 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
8805                                      struct nfs41_create_session_res *res)
8806 {
8807         int ret;
8808
8809         ret = nfs4_verify_fore_channel_attrs(args, res);
8810         if (ret)
8811                 return ret;
8812         return nfs4_verify_back_channel_attrs(args, res);
8813 }
8814
8815 static void nfs4_update_session(struct nfs4_session *session,
8816                 struct nfs41_create_session_res *res)
8817 {
8818         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
8819         /* Mark client id and session as being confirmed */
8820         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
8821         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
8822         session->flags = res->flags;
8823         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
8824         if (res->flags & SESSION4_BACK_CHAN)
8825                 memcpy(&session->bc_attrs, &res->bc_attrs,
8826                                 sizeof(session->bc_attrs));
8827 }
8828
8829 static int _nfs4_proc_create_session(struct nfs_client *clp,
8830                 const struct cred *cred)
8831 {
8832         struct nfs4_session *session = clp->cl_session;
8833         struct nfs41_create_session_args args = {
8834                 .client = clp,
8835                 .clientid = clp->cl_clientid,
8836                 .seqid = clp->cl_seqid,
8837                 .cb_program = NFS4_CALLBACK,
8838         };
8839         struct nfs41_create_session_res res;
8840
8841         struct rpc_message msg = {
8842                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
8843                 .rpc_argp = &args,
8844                 .rpc_resp = &res,
8845                 .rpc_cred = cred,
8846         };
8847         int status;
8848
8849         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
8850         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
8851
8852         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8853                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8854         trace_nfs4_create_session(clp, status);
8855
8856         switch (status) {
8857         case -NFS4ERR_STALE_CLIENTID:
8858         case -NFS4ERR_DELAY:
8859         case -ETIMEDOUT:
8860         case -EACCES:
8861         case -EAGAIN:
8862                 goto out;
8863         }
8864
8865         clp->cl_seqid++;
8866         if (!status) {
8867                 /* Verify the session's negotiated channel_attrs values */
8868                 status = nfs4_verify_channel_attrs(&args, &res);
8869                 /* Increment the clientid slot sequence id */
8870                 if (status)
8871                         goto out;
8872                 nfs4_update_session(session, &res);
8873         }
8874 out:
8875         return status;
8876 }
8877
8878 /*
8879  * Issues a CREATE_SESSION operation to the server.
8880  * It is the responsibility of the caller to verify the session is
8881  * expired before calling this routine.
8882  */
8883 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
8884 {
8885         int status;
8886         unsigned *ptr;
8887         struct nfs4_session *session = clp->cl_session;
8888
8889         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
8890
8891         status = _nfs4_proc_create_session(clp, cred);
8892         if (status)
8893                 goto out;
8894
8895         /* Init or reset the session slot tables */
8896         status = nfs4_setup_session_slot_tables(session);
8897         dprintk("slot table setup returned %d\n", status);
8898         if (status)
8899                 goto out;
8900
8901         ptr = (unsigned *)&session->sess_id.data[0];
8902         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
8903                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
8904 out:
8905         dprintk("<-- %s\n", __func__);
8906         return status;
8907 }
8908
8909 /*
8910  * Issue the over-the-wire RPC DESTROY_SESSION.
8911  * The caller must serialize access to this routine.
8912  */
8913 int nfs4_proc_destroy_session(struct nfs4_session *session,
8914                 const struct cred *cred)
8915 {
8916         struct rpc_message msg = {
8917                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
8918                 .rpc_argp = session,
8919                 .rpc_cred = cred,
8920         };
8921         int status = 0;
8922
8923         dprintk("--> nfs4_proc_destroy_session\n");
8924
8925         /* session is still being setup */
8926         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
8927                 return 0;
8928
8929         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8930                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8931         trace_nfs4_destroy_session(session->clp, status);
8932
8933         if (status)
8934                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
8935                         "Session has been destroyed regardless...\n", status);
8936
8937         dprintk("<-- nfs4_proc_destroy_session\n");
8938         return status;
8939 }
8940
8941 /*
8942  * Renew the cl_session lease.
8943  */
8944 struct nfs4_sequence_data {
8945         struct nfs_client *clp;
8946         struct nfs4_sequence_args args;
8947         struct nfs4_sequence_res res;
8948 };
8949
8950 static void nfs41_sequence_release(void *data)
8951 {
8952         struct nfs4_sequence_data *calldata = data;
8953         struct nfs_client *clp = calldata->clp;
8954
8955         if (refcount_read(&clp->cl_count) > 1)
8956                 nfs4_schedule_state_renewal(clp);
8957         nfs_put_client(clp);
8958         kfree(calldata);
8959 }
8960
8961 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8962 {
8963         switch(task->tk_status) {
8964         case -NFS4ERR_DELAY:
8965                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8966                 return -EAGAIN;
8967         default:
8968                 nfs4_schedule_lease_recovery(clp);
8969         }
8970         return 0;
8971 }
8972
8973 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
8974 {
8975         struct nfs4_sequence_data *calldata = data;
8976         struct nfs_client *clp = calldata->clp;
8977
8978         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
8979                 return;
8980
8981         trace_nfs4_sequence(clp, task->tk_status);
8982         if (task->tk_status < 0) {
8983                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
8984                 if (refcount_read(&clp->cl_count) == 1)
8985                         goto out;
8986
8987                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
8988                         rpc_restart_call_prepare(task);
8989                         return;
8990                 }
8991         }
8992         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
8993 out:
8994         dprintk("<-- %s\n", __func__);
8995 }
8996
8997 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
8998 {
8999         struct nfs4_sequence_data *calldata = data;
9000         struct nfs_client *clp = calldata->clp;
9001         struct nfs4_sequence_args *args;
9002         struct nfs4_sequence_res *res;
9003
9004         args = task->tk_msg.rpc_argp;
9005         res = task->tk_msg.rpc_resp;
9006
9007         nfs4_setup_sequence(clp, args, res, task);
9008 }
9009
9010 static const struct rpc_call_ops nfs41_sequence_ops = {
9011         .rpc_call_done = nfs41_sequence_call_done,
9012         .rpc_call_prepare = nfs41_sequence_prepare,
9013         .rpc_release = nfs41_sequence_release,
9014 };
9015
9016 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9017                 const struct cred *cred,
9018                 struct nfs4_slot *slot,
9019                 bool is_privileged)
9020 {
9021         struct nfs4_sequence_data *calldata;
9022         struct rpc_message msg = {
9023                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9024                 .rpc_cred = cred,
9025         };
9026         struct rpc_task_setup task_setup_data = {
9027                 .rpc_client = clp->cl_rpcclient,
9028                 .rpc_message = &msg,
9029                 .callback_ops = &nfs41_sequence_ops,
9030                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
9031         };
9032         struct rpc_task *ret;
9033
9034         ret = ERR_PTR(-EIO);
9035         if (!refcount_inc_not_zero(&clp->cl_count))
9036                 goto out_err;
9037
9038         ret = ERR_PTR(-ENOMEM);
9039         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9040         if (calldata == NULL)
9041                 goto out_put_clp;
9042         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9043         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9044         msg.rpc_argp = &calldata->args;
9045         msg.rpc_resp = &calldata->res;
9046         calldata->clp = clp;
9047         task_setup_data.callback_data = calldata;
9048
9049         ret = rpc_run_task(&task_setup_data);
9050         if (IS_ERR(ret))
9051                 goto out_err;
9052         return ret;
9053 out_put_clp:
9054         nfs_put_client(clp);
9055 out_err:
9056         nfs41_release_slot(slot);
9057         return ret;
9058 }
9059
9060 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9061 {
9062         struct rpc_task *task;
9063         int ret = 0;
9064
9065         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9066                 return -EAGAIN;
9067         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9068         if (IS_ERR(task))
9069                 ret = PTR_ERR(task);
9070         else
9071                 rpc_put_task_async(task);
9072         dprintk("<-- %s status=%d\n", __func__, ret);
9073         return ret;
9074 }
9075
9076 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9077 {
9078         struct rpc_task *task;
9079         int ret;
9080
9081         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9082         if (IS_ERR(task)) {
9083                 ret = PTR_ERR(task);
9084                 goto out;
9085         }
9086         ret = rpc_wait_for_completion_task(task);
9087         if (!ret)
9088                 ret = task->tk_status;
9089         rpc_put_task(task);
9090 out:
9091         dprintk("<-- %s status=%d\n", __func__, ret);
9092         return ret;
9093 }
9094
9095 struct nfs4_reclaim_complete_data {
9096         struct nfs_client *clp;
9097         struct nfs41_reclaim_complete_args arg;
9098         struct nfs41_reclaim_complete_res res;
9099 };
9100
9101 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9102 {
9103         struct nfs4_reclaim_complete_data *calldata = data;
9104
9105         nfs4_setup_sequence(calldata->clp,
9106                         &calldata->arg.seq_args,
9107                         &calldata->res.seq_res,
9108                         task);
9109 }
9110
9111 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9112 {
9113         switch(task->tk_status) {
9114         case 0:
9115                 wake_up_all(&clp->cl_lock_waitq);
9116                 /* Fallthrough */
9117         case -NFS4ERR_COMPLETE_ALREADY:
9118         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9119                 break;
9120         case -NFS4ERR_DELAY:
9121                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9122                 /* fall through */
9123         case -NFS4ERR_RETRY_UNCACHED_REP:
9124                 return -EAGAIN;
9125         case -NFS4ERR_BADSESSION:
9126         case -NFS4ERR_DEADSESSION:
9127         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9128                 break;
9129         default:
9130                 nfs4_schedule_lease_recovery(clp);
9131         }
9132         return 0;
9133 }
9134
9135 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9136 {
9137         struct nfs4_reclaim_complete_data *calldata = data;
9138         struct nfs_client *clp = calldata->clp;
9139         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9140
9141         dprintk("--> %s\n", __func__);
9142         if (!nfs41_sequence_done(task, res))
9143                 return;
9144
9145         trace_nfs4_reclaim_complete(clp, task->tk_status);
9146         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9147                 rpc_restart_call_prepare(task);
9148                 return;
9149         }
9150         dprintk("<-- %s\n", __func__);
9151 }
9152
9153 static void nfs4_free_reclaim_complete_data(void *data)
9154 {
9155         struct nfs4_reclaim_complete_data *calldata = data;
9156
9157         kfree(calldata);
9158 }
9159
9160 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9161         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9162         .rpc_call_done = nfs4_reclaim_complete_done,
9163         .rpc_release = nfs4_free_reclaim_complete_data,
9164 };
9165
9166 /*
9167  * Issue a global reclaim complete.
9168  */
9169 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9170                 const struct cred *cred)
9171 {
9172         struct nfs4_reclaim_complete_data *calldata;
9173         struct rpc_message msg = {
9174                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9175                 .rpc_cred = cred,
9176         };
9177         struct rpc_task_setup task_setup_data = {
9178                 .rpc_client = clp->cl_rpcclient,
9179                 .rpc_message = &msg,
9180                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9181                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9182         };
9183         int status = -ENOMEM;
9184
9185         dprintk("--> %s\n", __func__);
9186         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9187         if (calldata == NULL)
9188                 goto out;
9189         calldata->clp = clp;
9190         calldata->arg.one_fs = 0;
9191
9192         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9193         msg.rpc_argp = &calldata->arg;
9194         msg.rpc_resp = &calldata->res;
9195         task_setup_data.callback_data = calldata;
9196         status = nfs4_call_sync_custom(&task_setup_data);
9197 out:
9198         dprintk("<-- %s status=%d\n", __func__, status);
9199         return status;
9200 }
9201
9202 static void
9203 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9204 {
9205         struct nfs4_layoutget *lgp = calldata;
9206         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9207
9208         dprintk("--> %s\n", __func__);
9209         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9210                                 &lgp->res.seq_res, task);
9211         dprintk("<-- %s\n", __func__);
9212 }
9213
9214 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9215 {
9216         struct nfs4_layoutget *lgp = calldata;
9217
9218         dprintk("--> %s\n", __func__);
9219         nfs41_sequence_process(task, &lgp->res.seq_res);
9220         dprintk("<-- %s\n", __func__);
9221 }
9222
9223 static int
9224 nfs4_layoutget_handle_exception(struct rpc_task *task,
9225                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9226 {
9227         struct inode *inode = lgp->args.inode;
9228         struct nfs_server *server = NFS_SERVER(inode);
9229         struct pnfs_layout_hdr *lo;
9230         int nfs4err = task->tk_status;
9231         int err, status = 0;
9232         LIST_HEAD(head);
9233
9234         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9235
9236         nfs4_sequence_free_slot(&lgp->res.seq_res);
9237
9238         switch (nfs4err) {
9239         case 0:
9240                 goto out;
9241
9242         /*
9243          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9244          * on the file. set tk_status to -ENODATA to tell upper layer to
9245          * retry go inband.
9246          */
9247         case -NFS4ERR_LAYOUTUNAVAILABLE:
9248                 status = -ENODATA;
9249                 goto out;
9250         /*
9251          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9252          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9253          */
9254         case -NFS4ERR_BADLAYOUT:
9255                 status = -EOVERFLOW;
9256                 goto out;
9257         /*
9258          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9259          * (or clients) writing to the same RAID stripe except when
9260          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9261          *
9262          * Treat it like we would RECALLCONFLICT -- we retry for a little
9263          * while, and then eventually give up.
9264          */
9265         case -NFS4ERR_LAYOUTTRYLATER:
9266                 if (lgp->args.minlength == 0) {
9267                         status = -EOVERFLOW;
9268                         goto out;
9269                 }
9270                 status = -EBUSY;
9271                 break;
9272         case -NFS4ERR_RECALLCONFLICT:
9273                 status = -ERECALLCONFLICT;
9274                 break;
9275         case -NFS4ERR_DELEG_REVOKED:
9276         case -NFS4ERR_ADMIN_REVOKED:
9277         case -NFS4ERR_EXPIRED:
9278         case -NFS4ERR_BAD_STATEID:
9279                 exception->timeout = 0;
9280                 spin_lock(&inode->i_lock);
9281                 lo = NFS_I(inode)->layout;
9282                 /* If the open stateid was bad, then recover it. */
9283                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9284                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9285                         spin_unlock(&inode->i_lock);
9286                         exception->state = lgp->args.ctx->state;
9287                         exception->stateid = &lgp->args.stateid;
9288                         break;
9289                 }
9290
9291                 /*
9292                  * Mark the bad layout state as invalid, then retry
9293                  */
9294                 pnfs_mark_layout_stateid_invalid(lo, &head);
9295                 spin_unlock(&inode->i_lock);
9296                 nfs_commit_inode(inode, 0);
9297                 pnfs_free_lseg_list(&head);
9298                 status = -EAGAIN;
9299                 goto out;
9300         }
9301
9302         err = nfs4_handle_exception(server, nfs4err, exception);
9303         if (!status) {
9304                 if (exception->retry)
9305                         status = -EAGAIN;
9306                 else
9307                         status = err;
9308         }
9309 out:
9310         dprintk("<-- %s\n", __func__);
9311         return status;
9312 }
9313
9314 size_t max_response_pages(struct nfs_server *server)
9315 {
9316         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9317         return nfs_page_array_len(0, max_resp_sz);
9318 }
9319
9320 static void nfs4_layoutget_release(void *calldata)
9321 {
9322         struct nfs4_layoutget *lgp = calldata;
9323
9324         dprintk("--> %s\n", __func__);
9325         nfs4_sequence_free_slot(&lgp->res.seq_res);
9326         pnfs_layoutget_free(lgp);
9327         dprintk("<-- %s\n", __func__);
9328 }
9329
9330 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9331         .rpc_call_prepare = nfs4_layoutget_prepare,
9332         .rpc_call_done = nfs4_layoutget_done,
9333         .rpc_release = nfs4_layoutget_release,
9334 };
9335
9336 struct pnfs_layout_segment *
9337 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9338 {
9339         struct inode *inode = lgp->args.inode;
9340         struct nfs_server *server = NFS_SERVER(inode);
9341         struct rpc_task *task;
9342         struct rpc_message msg = {
9343                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9344                 .rpc_argp = &lgp->args,
9345                 .rpc_resp = &lgp->res,
9346                 .rpc_cred = lgp->cred,
9347         };
9348         struct rpc_task_setup task_setup_data = {
9349                 .rpc_client = server->client,
9350                 .rpc_message = &msg,
9351                 .callback_ops = &nfs4_layoutget_call_ops,
9352                 .callback_data = lgp,
9353                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
9354         };
9355         struct pnfs_layout_segment *lseg = NULL;
9356         struct nfs4_exception exception = {
9357                 .inode = inode,
9358                 .timeout = *timeout,
9359         };
9360         int status = 0;
9361
9362         dprintk("--> %s\n", __func__);
9363
9364         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
9365         pnfs_get_layout_hdr(NFS_I(inode)->layout);
9366
9367         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9368
9369         task = rpc_run_task(&task_setup_data);
9370
9371         status = rpc_wait_for_completion_task(task);
9372         if (status != 0)
9373                 goto out;
9374
9375         if (task->tk_status < 0) {
9376                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9377                 *timeout = exception.timeout;
9378         } else if (lgp->res.layoutp->len == 0) {
9379                 status = -EAGAIN;
9380                 *timeout = nfs4_update_delay(&exception.timeout);
9381         } else
9382                 lseg = pnfs_layout_process(lgp);
9383 out:
9384         trace_nfs4_layoutget(lgp->args.ctx,
9385                         &lgp->args.range,
9386                         &lgp->res.range,
9387                         &lgp->res.stateid,
9388                         status);
9389
9390         rpc_put_task(task);
9391         dprintk("<-- %s status=%d\n", __func__, status);
9392         if (status)
9393                 return ERR_PTR(status);
9394         return lseg;
9395 }
9396
9397 static void
9398 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9399 {
9400         struct nfs4_layoutreturn *lrp = calldata;
9401
9402         dprintk("--> %s\n", __func__);
9403         nfs4_setup_sequence(lrp->clp,
9404                         &lrp->args.seq_args,
9405                         &lrp->res.seq_res,
9406                         task);
9407         if (!pnfs_layout_is_valid(lrp->args.layout))
9408                 rpc_exit(task, 0);
9409 }
9410
9411 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9412 {
9413         struct nfs4_layoutreturn *lrp = calldata;
9414         struct nfs_server *server;
9415
9416         dprintk("--> %s\n", __func__);
9417
9418         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9419                 return;
9420
9421         /*
9422          * Was there an RPC level error? Assume the call succeeded,
9423          * and that we need to release the layout
9424          */
9425         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9426                 lrp->res.lrs_present = 0;
9427                 return;
9428         }
9429
9430         server = NFS_SERVER(lrp->args.inode);
9431         switch (task->tk_status) {
9432         case -NFS4ERR_OLD_STATEID:
9433                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9434                                         &lrp->args.range,
9435                                         lrp->args.inode))
9436                         goto out_restart;
9437                 /* Fallthrough */
9438         default:
9439                 task->tk_status = 0;
9440                 /* Fallthrough */
9441         case 0:
9442                 break;
9443         case -NFS4ERR_DELAY:
9444                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9445                         break;
9446                 goto out_restart;
9447         }
9448         dprintk("<-- %s\n", __func__);
9449         return;
9450 out_restart:
9451         task->tk_status = 0;
9452         nfs4_sequence_free_slot(&lrp->res.seq_res);
9453         rpc_restart_call_prepare(task);
9454 }
9455
9456 static void nfs4_layoutreturn_release(void *calldata)
9457 {
9458         struct nfs4_layoutreturn *lrp = calldata;
9459         struct pnfs_layout_hdr *lo = lrp->args.layout;
9460
9461         dprintk("--> %s\n", __func__);
9462         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9463                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9464         nfs4_sequence_free_slot(&lrp->res.seq_res);
9465         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9466                 lrp->ld_private.ops->free(&lrp->ld_private);
9467         pnfs_put_layout_hdr(lrp->args.layout);
9468         nfs_iput_and_deactive(lrp->inode);
9469         put_cred(lrp->cred);
9470         kfree(calldata);
9471         dprintk("<-- %s\n", __func__);
9472 }
9473
9474 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9475         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9476         .rpc_call_done = nfs4_layoutreturn_done,
9477         .rpc_release = nfs4_layoutreturn_release,
9478 };
9479
9480 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9481 {
9482         struct rpc_task *task;
9483         struct rpc_message msg = {
9484                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9485                 .rpc_argp = &lrp->args,
9486                 .rpc_resp = &lrp->res,
9487                 .rpc_cred = lrp->cred,
9488         };
9489         struct rpc_task_setup task_setup_data = {
9490                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9491                 .rpc_message = &msg,
9492                 .callback_ops = &nfs4_layoutreturn_call_ops,
9493                 .callback_data = lrp,
9494         };
9495         int status = 0;
9496
9497         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9498                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9499                         &task_setup_data.rpc_client, &msg);
9500
9501         dprintk("--> %s\n", __func__);
9502         if (!sync) {
9503                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9504                 if (!lrp->inode) {
9505                         nfs4_layoutreturn_release(lrp);
9506                         return -EAGAIN;
9507                 }
9508                 task_setup_data.flags |= RPC_TASK_ASYNC;
9509         }
9510         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0);
9511         task = rpc_run_task(&task_setup_data);
9512         if (IS_ERR(task))
9513                 return PTR_ERR(task);
9514         if (sync)
9515                 status = task->tk_status;
9516         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9517         dprintk("<-- %s status=%d\n", __func__, status);
9518         rpc_put_task(task);
9519         return status;
9520 }
9521
9522 static int
9523 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9524                 struct pnfs_device *pdev,
9525                 const struct cred *cred)
9526 {
9527         struct nfs4_getdeviceinfo_args args = {
9528                 .pdev = pdev,
9529                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9530                         NOTIFY_DEVICEID4_DELETE,
9531         };
9532         struct nfs4_getdeviceinfo_res res = {
9533                 .pdev = pdev,
9534         };
9535         struct rpc_message msg = {
9536                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9537                 .rpc_argp = &args,
9538                 .rpc_resp = &res,
9539                 .rpc_cred = cred,
9540         };
9541         int status;
9542
9543         dprintk("--> %s\n", __func__);
9544         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9545         if (res.notification & ~args.notify_types)
9546                 dprintk("%s: unsupported notification\n", __func__);
9547         if (res.notification != args.notify_types)
9548                 pdev->nocache = 1;
9549
9550         dprintk("<-- %s status=%d\n", __func__, status);
9551
9552         return status;
9553 }
9554
9555 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9556                 struct pnfs_device *pdev,
9557                 const struct cred *cred)
9558 {
9559         struct nfs4_exception exception = { };
9560         int err;
9561
9562         do {
9563                 err = nfs4_handle_exception(server,
9564                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9565                                         &exception);
9566         } while (exception.retry);
9567         return err;
9568 }
9569 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9570
9571 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9572 {
9573         struct nfs4_layoutcommit_data *data = calldata;
9574         struct nfs_server *server = NFS_SERVER(data->args.inode);
9575
9576         nfs4_setup_sequence(server->nfs_client,
9577                         &data->args.seq_args,
9578                         &data->res.seq_res,
9579                         task);
9580 }
9581
9582 static void
9583 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9584 {
9585         struct nfs4_layoutcommit_data *data = calldata;
9586         struct nfs_server *server = NFS_SERVER(data->args.inode);
9587
9588         if (!nfs41_sequence_done(task, &data->res.seq_res))
9589                 return;
9590
9591         switch (task->tk_status) { /* Just ignore these failures */
9592         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9593         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9594         case -NFS4ERR_BADLAYOUT:     /* no layout */
9595         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9596                 task->tk_status = 0;
9597         case 0:
9598                 break;
9599         default:
9600                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9601                         rpc_restart_call_prepare(task);
9602                         return;
9603                 }
9604         }
9605 }
9606
9607 static void nfs4_layoutcommit_release(void *calldata)
9608 {
9609         struct nfs4_layoutcommit_data *data = calldata;
9610
9611         pnfs_cleanup_layoutcommit(data);
9612         nfs_post_op_update_inode_force_wcc(data->args.inode,
9613                                            data->res.fattr);
9614         put_cred(data->cred);
9615         nfs_iput_and_deactive(data->inode);
9616         kfree(data);
9617 }
9618
9619 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9620         .rpc_call_prepare = nfs4_layoutcommit_prepare,
9621         .rpc_call_done = nfs4_layoutcommit_done,
9622         .rpc_release = nfs4_layoutcommit_release,
9623 };
9624
9625 int
9626 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9627 {
9628         struct rpc_message msg = {
9629                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9630                 .rpc_argp = &data->args,
9631                 .rpc_resp = &data->res,
9632                 .rpc_cred = data->cred,
9633         };
9634         struct rpc_task_setup task_setup_data = {
9635                 .task = &data->task,
9636                 .rpc_client = NFS_CLIENT(data->args.inode),
9637                 .rpc_message = &msg,
9638                 .callback_ops = &nfs4_layoutcommit_ops,
9639                 .callback_data = data,
9640         };
9641         struct rpc_task *task;
9642         int status = 0;
9643
9644         dprintk("NFS: initiating layoutcommit call. sync %d "
9645                 "lbw: %llu inode %lu\n", sync,
9646                 data->args.lastbytewritten,
9647                 data->args.inode->i_ino);
9648
9649         if (!sync) {
9650                 data->inode = nfs_igrab_and_active(data->args.inode);
9651                 if (data->inode == NULL) {
9652                         nfs4_layoutcommit_release(data);
9653                         return -EAGAIN;
9654                 }
9655                 task_setup_data.flags = RPC_TASK_ASYNC;
9656         }
9657         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
9658         task = rpc_run_task(&task_setup_data);
9659         if (IS_ERR(task))
9660                 return PTR_ERR(task);
9661         if (sync)
9662                 status = task->tk_status;
9663         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
9664         dprintk("%s: status %d\n", __func__, status);
9665         rpc_put_task(task);
9666         return status;
9667 }
9668
9669 /*
9670  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
9671  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
9672  */
9673 static int
9674 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9675                     struct nfs_fsinfo *info,
9676                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
9677 {
9678         struct nfs41_secinfo_no_name_args args = {
9679                 .style = SECINFO_STYLE_CURRENT_FH,
9680         };
9681         struct nfs4_secinfo_res res = {
9682                 .flavors = flavors,
9683         };
9684         struct rpc_message msg = {
9685                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
9686                 .rpc_argp = &args,
9687                 .rpc_resp = &res,
9688         };
9689         struct rpc_clnt *clnt = server->client;
9690         struct nfs4_call_sync_data data = {
9691                 .seq_server = server,
9692                 .seq_args = &args.seq_args,
9693                 .seq_res = &res.seq_res,
9694         };
9695         struct rpc_task_setup task_setup = {
9696                 .rpc_client = server->client,
9697                 .rpc_message = &msg,
9698                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
9699                 .callback_data = &data,
9700                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9701         };
9702         const struct cred *cred = NULL;
9703         int status;
9704
9705         if (use_integrity) {
9706                 clnt = server->nfs_client->cl_rpcclient;
9707                 task_setup.rpc_client = clnt;
9708
9709                 cred = nfs4_get_clid_cred(server->nfs_client);
9710                 msg.rpc_cred = cred;
9711         }
9712
9713         dprintk("--> %s\n", __func__);
9714         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
9715         status = nfs4_call_sync_custom(&task_setup);
9716         dprintk("<-- %s status=%d\n", __func__, status);
9717
9718         put_cred(cred);
9719
9720         return status;
9721 }
9722
9723 static int
9724 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9725                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
9726 {
9727         struct nfs4_exception exception = {
9728                 .interruptible = true,
9729         };
9730         int err;
9731         do {
9732                 /* first try using integrity protection */
9733                 err = -NFS4ERR_WRONGSEC;
9734
9735                 /* try to use integrity protection with machine cred */
9736                 if (_nfs4_is_integrity_protected(server->nfs_client))
9737                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9738                                                           flavors, true);
9739
9740                 /*
9741                  * if unable to use integrity protection, or SECINFO with
9742                  * integrity protection returns NFS4ERR_WRONGSEC (which is
9743                  * disallowed by spec, but exists in deployed servers) use
9744                  * the current filesystem's rpc_client and the user cred.
9745                  */
9746                 if (err == -NFS4ERR_WRONGSEC)
9747                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9748                                                           flavors, false);
9749
9750                 switch (err) {
9751                 case 0:
9752                 case -NFS4ERR_WRONGSEC:
9753                 case -ENOTSUPP:
9754                         goto out;
9755                 default:
9756                         err = nfs4_handle_exception(server, err, &exception);
9757                 }
9758         } while (exception.retry);
9759 out:
9760         return err;
9761 }
9762
9763 static int
9764 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
9765                     struct nfs_fsinfo *info)
9766 {
9767         int err;
9768         struct page *page;
9769         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
9770         struct nfs4_secinfo_flavors *flavors;
9771         struct nfs4_secinfo4 *secinfo;
9772         int i;
9773
9774         page = alloc_page(GFP_KERNEL);
9775         if (!page) {
9776                 err = -ENOMEM;
9777                 goto out;
9778         }
9779
9780         flavors = page_address(page);
9781         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
9782
9783         /*
9784          * Fall back on "guess and check" method if
9785          * the server doesn't support SECINFO_NO_NAME
9786          */
9787         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
9788                 err = nfs4_find_root_sec(server, fhandle, info);
9789                 goto out_freepage;
9790         }
9791         if (err)
9792                 goto out_freepage;
9793
9794         for (i = 0; i < flavors->num_flavors; i++) {
9795                 secinfo = &flavors->flavors[i];
9796
9797                 switch (secinfo->flavor) {
9798                 case RPC_AUTH_NULL:
9799                 case RPC_AUTH_UNIX:
9800                 case RPC_AUTH_GSS:
9801                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
9802                                         &secinfo->flavor_info);
9803                         break;
9804                 default:
9805                         flavor = RPC_AUTH_MAXFLAVOR;
9806                         break;
9807                 }
9808
9809                 if (!nfs_auth_info_match(&server->auth_info, flavor))
9810                         flavor = RPC_AUTH_MAXFLAVOR;
9811
9812                 if (flavor != RPC_AUTH_MAXFLAVOR) {
9813                         err = nfs4_lookup_root_sec(server, fhandle,
9814                                                    info, flavor);
9815                         if (!err)
9816                                 break;
9817                 }
9818         }
9819
9820         if (flavor == RPC_AUTH_MAXFLAVOR)
9821                 err = -EPERM;
9822
9823 out_freepage:
9824         put_page(page);
9825         if (err == -EACCES)
9826                 return -EPERM;
9827 out:
9828         return err;
9829 }
9830
9831 static int _nfs41_test_stateid(struct nfs_server *server,
9832                 nfs4_stateid *stateid,
9833                 const struct cred *cred)
9834 {
9835         int status;
9836         struct nfs41_test_stateid_args args = {
9837                 .stateid = stateid,
9838         };
9839         struct nfs41_test_stateid_res res;
9840         struct rpc_message msg = {
9841                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
9842                 .rpc_argp = &args,
9843                 .rpc_resp = &res,
9844                 .rpc_cred = cred,
9845         };
9846         struct rpc_clnt *rpc_client = server->client;
9847
9848         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9849                 &rpc_client, &msg);
9850
9851         dprintk("NFS call  test_stateid %p\n", stateid);
9852         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
9853         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
9854                         &args.seq_args, &res.seq_res);
9855         if (status != NFS_OK) {
9856                 dprintk("NFS reply test_stateid: failed, %d\n", status);
9857                 return status;
9858         }
9859         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
9860         return -res.status;
9861 }
9862
9863 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
9864                 int err, struct nfs4_exception *exception)
9865 {
9866         exception->retry = 0;
9867         switch(err) {
9868         case -NFS4ERR_DELAY:
9869         case -NFS4ERR_RETRY_UNCACHED_REP:
9870                 nfs4_handle_exception(server, err, exception);
9871                 break;
9872         case -NFS4ERR_BADSESSION:
9873         case -NFS4ERR_BADSLOT:
9874         case -NFS4ERR_BAD_HIGH_SLOT:
9875         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9876         case -NFS4ERR_DEADSESSION:
9877                 nfs4_do_handle_exception(server, err, exception);
9878         }
9879 }
9880
9881 /**
9882  * nfs41_test_stateid - perform a TEST_STATEID operation
9883  *
9884  * @server: server / transport on which to perform the operation
9885  * @stateid: state ID to test
9886  * @cred: credential
9887  *
9888  * Returns NFS_OK if the server recognizes that "stateid" is valid.
9889  * Otherwise a negative NFS4ERR value is returned if the operation
9890  * failed or the state ID is not currently valid.
9891  */
9892 static int nfs41_test_stateid(struct nfs_server *server,
9893                 nfs4_stateid *stateid,
9894                 const struct cred *cred)
9895 {
9896         struct nfs4_exception exception = {
9897                 .interruptible = true,
9898         };
9899         int err;
9900         do {
9901                 err = _nfs41_test_stateid(server, stateid, cred);
9902                 nfs4_handle_delay_or_session_error(server, err, &exception);
9903         } while (exception.retry);
9904         return err;
9905 }
9906
9907 struct nfs_free_stateid_data {
9908         struct nfs_server *server;
9909         struct nfs41_free_stateid_args args;
9910         struct nfs41_free_stateid_res res;
9911 };
9912
9913 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
9914 {
9915         struct nfs_free_stateid_data *data = calldata;
9916         nfs4_setup_sequence(data->server->nfs_client,
9917                         &data->args.seq_args,
9918                         &data->res.seq_res,
9919                         task);
9920 }
9921
9922 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
9923 {
9924         struct nfs_free_stateid_data *data = calldata;
9925
9926         nfs41_sequence_done(task, &data->res.seq_res);
9927
9928         switch (task->tk_status) {
9929         case -NFS4ERR_DELAY:
9930                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
9931                         rpc_restart_call_prepare(task);
9932         }
9933 }
9934
9935 static void nfs41_free_stateid_release(void *calldata)
9936 {
9937         kfree(calldata);
9938 }
9939
9940 static const struct rpc_call_ops nfs41_free_stateid_ops = {
9941         .rpc_call_prepare = nfs41_free_stateid_prepare,
9942         .rpc_call_done = nfs41_free_stateid_done,
9943         .rpc_release = nfs41_free_stateid_release,
9944 };
9945
9946 /**
9947  * nfs41_free_stateid - perform a FREE_STATEID operation
9948  *
9949  * @server: server / transport on which to perform the operation
9950  * @stateid: state ID to release
9951  * @cred: credential
9952  * @privileged: set to true if this call needs to be privileged
9953  *
9954  * Note: this function is always asynchronous.
9955  */
9956 static int nfs41_free_stateid(struct nfs_server *server,
9957                 const nfs4_stateid *stateid,
9958                 const struct cred *cred,
9959                 bool privileged)
9960 {
9961         struct rpc_message msg = {
9962                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
9963                 .rpc_cred = cred,
9964         };
9965         struct rpc_task_setup task_setup = {
9966                 .rpc_client = server->client,
9967                 .rpc_message = &msg,
9968                 .callback_ops = &nfs41_free_stateid_ops,
9969                 .flags = RPC_TASK_ASYNC,
9970         };
9971         struct nfs_free_stateid_data *data;
9972         struct rpc_task *task;
9973
9974         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9975                 &task_setup.rpc_client, &msg);
9976
9977         dprintk("NFS call  free_stateid %p\n", stateid);
9978         data = kmalloc(sizeof(*data), GFP_NOFS);
9979         if (!data)
9980                 return -ENOMEM;
9981         data->server = server;
9982         nfs4_stateid_copy(&data->args.stateid, stateid);
9983
9984         task_setup.callback_data = data;
9985
9986         msg.rpc_argp = &data->args;
9987         msg.rpc_resp = &data->res;
9988         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
9989         task = rpc_run_task(&task_setup);
9990         if (IS_ERR(task))
9991                 return PTR_ERR(task);
9992         rpc_put_task(task);
9993         return 0;
9994 }
9995
9996 static void
9997 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
9998 {
9999         const struct cred *cred = lsp->ls_state->owner->so_cred;
10000
10001         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10002         nfs4_free_lock_state(server, lsp);
10003 }
10004
10005 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10006                 const nfs4_stateid *s2)
10007 {
10008         if (s1->type != s2->type)
10009                 return false;
10010
10011         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10012                 return false;
10013
10014         if (s1->seqid == s2->seqid)
10015                 return true;
10016
10017         return s1->seqid == 0 || s2->seqid == 0;
10018 }
10019
10020 #endif /* CONFIG_NFS_V4_1 */
10021
10022 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10023                 const nfs4_stateid *s2)
10024 {
10025         return nfs4_stateid_match(s1, s2);
10026 }
10027
10028
10029 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10030         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10031         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10032         .recover_open   = nfs4_open_reclaim,
10033         .recover_lock   = nfs4_lock_reclaim,
10034         .establish_clid = nfs4_init_clientid,
10035         .detect_trunking = nfs40_discover_server_trunking,
10036 };
10037
10038 #if defined(CONFIG_NFS_V4_1)
10039 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10040         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10041         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10042         .recover_open   = nfs4_open_reclaim,
10043         .recover_lock   = nfs4_lock_reclaim,
10044         .establish_clid = nfs41_init_clientid,
10045         .reclaim_complete = nfs41_proc_reclaim_complete,
10046         .detect_trunking = nfs41_discover_server_trunking,
10047 };
10048 #endif /* CONFIG_NFS_V4_1 */
10049
10050 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10051         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10052         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10053         .recover_open   = nfs40_open_expired,
10054         .recover_lock   = nfs4_lock_expired,
10055         .establish_clid = nfs4_init_clientid,
10056 };
10057
10058 #if defined(CONFIG_NFS_V4_1)
10059 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10060         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10061         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10062         .recover_open   = nfs41_open_expired,
10063         .recover_lock   = nfs41_lock_expired,
10064         .establish_clid = nfs41_init_clientid,
10065 };
10066 #endif /* CONFIG_NFS_V4_1 */
10067
10068 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10069         .sched_state_renewal = nfs4_proc_async_renew,
10070         .get_state_renewal_cred = nfs4_get_renew_cred,
10071         .renew_lease = nfs4_proc_renew,
10072 };
10073
10074 #if defined(CONFIG_NFS_V4_1)
10075 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10076         .sched_state_renewal = nfs41_proc_async_sequence,
10077         .get_state_renewal_cred = nfs4_get_machine_cred,
10078         .renew_lease = nfs4_proc_sequence,
10079 };
10080 #endif
10081
10082 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10083         .get_locations = _nfs40_proc_get_locations,
10084         .fsid_present = _nfs40_proc_fsid_present,
10085 };
10086
10087 #if defined(CONFIG_NFS_V4_1)
10088 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10089         .get_locations = _nfs41_proc_get_locations,
10090         .fsid_present = _nfs41_proc_fsid_present,
10091 };
10092 #endif  /* CONFIG_NFS_V4_1 */
10093
10094 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10095         .minor_version = 0,
10096         .init_caps = NFS_CAP_READDIRPLUS
10097                 | NFS_CAP_ATOMIC_OPEN
10098                 | NFS_CAP_POSIX_LOCK,
10099         .init_client = nfs40_init_client,
10100         .shutdown_client = nfs40_shutdown_client,
10101         .match_stateid = nfs4_match_stateid,
10102         .find_root_sec = nfs4_find_root_sec,
10103         .free_lock_state = nfs4_release_lockowner,
10104         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10105         .alloc_seqid = nfs_alloc_seqid,
10106         .call_sync_ops = &nfs40_call_sync_ops,
10107         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10108         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10109         .state_renewal_ops = &nfs40_state_renewal_ops,
10110         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10111 };
10112
10113 #if defined(CONFIG_NFS_V4_1)
10114 static struct nfs_seqid *
10115 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10116 {
10117         return NULL;
10118 }
10119
10120 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10121         .minor_version = 1,
10122         .init_caps = NFS_CAP_READDIRPLUS
10123                 | NFS_CAP_ATOMIC_OPEN
10124                 | NFS_CAP_POSIX_LOCK
10125                 | NFS_CAP_STATEID_NFSV41
10126                 | NFS_CAP_ATOMIC_OPEN_V1
10127                 | NFS_CAP_LGOPEN,
10128         .init_client = nfs41_init_client,
10129         .shutdown_client = nfs41_shutdown_client,
10130         .match_stateid = nfs41_match_stateid,
10131         .find_root_sec = nfs41_find_root_sec,
10132         .free_lock_state = nfs41_free_lock_state,
10133         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10134         .alloc_seqid = nfs_alloc_no_seqid,
10135         .session_trunk = nfs4_test_session_trunk,
10136         .call_sync_ops = &nfs41_call_sync_ops,
10137         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10138         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10139         .state_renewal_ops = &nfs41_state_renewal_ops,
10140         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10141 };
10142 #endif
10143
10144 #if defined(CONFIG_NFS_V4_2)
10145 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10146         .minor_version = 2,
10147         .init_caps = NFS_CAP_READDIRPLUS
10148                 | NFS_CAP_ATOMIC_OPEN
10149                 | NFS_CAP_POSIX_LOCK
10150                 | NFS_CAP_STATEID_NFSV41
10151                 | NFS_CAP_ATOMIC_OPEN_V1
10152                 | NFS_CAP_LGOPEN
10153                 | NFS_CAP_ALLOCATE
10154                 | NFS_CAP_COPY
10155                 | NFS_CAP_OFFLOAD_CANCEL
10156                 | NFS_CAP_COPY_NOTIFY
10157                 | NFS_CAP_DEALLOCATE
10158                 | NFS_CAP_SEEK
10159                 | NFS_CAP_LAYOUTSTATS
10160                 | NFS_CAP_CLONE
10161                 | NFS_CAP_LAYOUTERROR,
10162         .init_client = nfs41_init_client,
10163         .shutdown_client = nfs41_shutdown_client,
10164         .match_stateid = nfs41_match_stateid,
10165         .find_root_sec = nfs41_find_root_sec,
10166         .free_lock_state = nfs41_free_lock_state,
10167         .call_sync_ops = &nfs41_call_sync_ops,
10168         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10169         .alloc_seqid = nfs_alloc_no_seqid,
10170         .session_trunk = nfs4_test_session_trunk,
10171         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10172         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10173         .state_renewal_ops = &nfs41_state_renewal_ops,
10174         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10175 };
10176 #endif
10177
10178 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10179         [0] = &nfs_v4_0_minor_ops,
10180 #if defined(CONFIG_NFS_V4_1)
10181         [1] = &nfs_v4_1_minor_ops,
10182 #endif
10183 #if defined(CONFIG_NFS_V4_2)
10184         [2] = &nfs_v4_2_minor_ops,
10185 #endif
10186 };
10187
10188 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10189 {
10190         ssize_t error, error2, error3;
10191
10192         error = generic_listxattr(dentry, list, size);
10193         if (error < 0)
10194                 return error;
10195         if (list) {
10196                 list += error;
10197                 size -= error;
10198         }
10199
10200         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10201         if (error2 < 0)
10202                 return error2;
10203
10204         if (list) {
10205                 list += error2;
10206                 size -= error2;
10207         }
10208
10209         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10210         if (error3 < 0)
10211                 return error3;
10212
10213         return error + error2 + error3;
10214 }
10215
10216 static const struct inode_operations nfs4_dir_inode_operations = {
10217         .create         = nfs_create,
10218         .lookup         = nfs_lookup,
10219         .atomic_open    = nfs_atomic_open,
10220         .link           = nfs_link,
10221         .unlink         = nfs_unlink,
10222         .symlink        = nfs_symlink,
10223         .mkdir          = nfs_mkdir,
10224         .rmdir          = nfs_rmdir,
10225         .mknod          = nfs_mknod,
10226         .rename         = nfs_rename,
10227         .permission     = nfs_permission,
10228         .getattr        = nfs_getattr,
10229         .setattr        = nfs_setattr,
10230         .listxattr      = nfs4_listxattr,
10231 };
10232
10233 static const struct inode_operations nfs4_file_inode_operations = {
10234         .permission     = nfs_permission,
10235         .getattr        = nfs_getattr,
10236         .setattr        = nfs_setattr,
10237         .listxattr      = nfs4_listxattr,
10238 };
10239
10240 const struct nfs_rpc_ops nfs_v4_clientops = {
10241         .version        = 4,                    /* protocol version */
10242         .dentry_ops     = &nfs4_dentry_operations,
10243         .dir_inode_ops  = &nfs4_dir_inode_operations,
10244         .file_inode_ops = &nfs4_file_inode_operations,
10245         .file_ops       = &nfs4_file_operations,
10246         .getroot        = nfs4_proc_get_root,
10247         .submount       = nfs4_submount,
10248         .try_get_tree   = nfs4_try_get_tree,
10249         .getattr        = nfs4_proc_getattr,
10250         .setattr        = nfs4_proc_setattr,
10251         .lookup         = nfs4_proc_lookup,
10252         .lookupp        = nfs4_proc_lookupp,
10253         .access         = nfs4_proc_access,
10254         .readlink       = nfs4_proc_readlink,
10255         .create         = nfs4_proc_create,
10256         .remove         = nfs4_proc_remove,
10257         .unlink_setup   = nfs4_proc_unlink_setup,
10258         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10259         .unlink_done    = nfs4_proc_unlink_done,
10260         .rename_setup   = nfs4_proc_rename_setup,
10261         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10262         .rename_done    = nfs4_proc_rename_done,
10263         .link           = nfs4_proc_link,
10264         .symlink        = nfs4_proc_symlink,
10265         .mkdir          = nfs4_proc_mkdir,
10266         .rmdir          = nfs4_proc_rmdir,
10267         .readdir        = nfs4_proc_readdir,
10268         .mknod          = nfs4_proc_mknod,
10269         .statfs         = nfs4_proc_statfs,
10270         .fsinfo         = nfs4_proc_fsinfo,
10271         .pathconf       = nfs4_proc_pathconf,
10272         .set_capabilities = nfs4_server_capabilities,
10273         .decode_dirent  = nfs4_decode_dirent,
10274         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10275         .read_setup     = nfs4_proc_read_setup,
10276         .read_done      = nfs4_read_done,
10277         .write_setup    = nfs4_proc_write_setup,
10278         .write_done     = nfs4_write_done,
10279         .commit_setup   = nfs4_proc_commit_setup,
10280         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10281         .commit_done    = nfs4_commit_done,
10282         .lock           = nfs4_proc_lock,
10283         .clear_acl_cache = nfs4_zap_acl_attr,
10284         .close_context  = nfs4_close_context,
10285         .open_context   = nfs4_atomic_open,
10286         .have_delegation = nfs4_have_delegation,
10287         .alloc_client   = nfs4_alloc_client,
10288         .init_client    = nfs4_init_client,
10289         .free_client    = nfs4_free_client,
10290         .create_server  = nfs4_create_server,
10291         .clone_server   = nfs_clone_server,
10292 };
10293
10294 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10295         .name   = XATTR_NAME_NFSV4_ACL,
10296         .list   = nfs4_xattr_list_nfs4_acl,
10297         .get    = nfs4_xattr_get_nfs4_acl,
10298         .set    = nfs4_xattr_set_nfs4_acl,
10299 };
10300
10301 #ifdef CONFIG_NFS_V4_2
10302 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10303         .prefix = XATTR_USER_PREFIX,
10304         .get    = nfs4_xattr_get_nfs4_user,
10305         .set    = nfs4_xattr_set_nfs4_user,
10306 };
10307 #endif
10308
10309 const struct xattr_handler *nfs4_xattr_handlers[] = {
10310         &nfs4_xattr_nfs4_acl_handler,
10311 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10312         &nfs4_xattr_nfs4_label_handler,
10313 #endif
10314 #ifdef CONFIG_NFS_V4_2
10315         &nfs4_xattr_nfs4_user_handler,
10316 #endif
10317         NULL
10318 };
10319
10320 /*
10321  * Local variables:
10322  *  c-basic-offset: 8
10323  * End:
10324  */