fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.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 "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_ACCESS:
 162                 return -EACCES;
 163         case -NFS4ERR_FILE_OPEN:
 164                 return -EBUSY;
 165         default:
 166                 dprintk("%s could not handle NFSv4 error %d\n",
 167                                 __func__, -err);
 168                 break;
 169         }
 170         return -EIO;
 171 }
 172
 173 /*
 174  * This is our standard bitmap for GETATTR requests.
 175  */
 176 const u32 nfs4_fattr_bitmap[3] = {
 177         FATTR4_WORD0_TYPE
 178         | FATTR4_WORD0_CHANGE
 179         | FATTR4_WORD0_SIZE
 180         | FATTR4_WORD0_FSID
 181         | FATTR4_WORD0_FILEID,
 182         FATTR4_WORD1_MODE
 183         | FATTR4_WORD1_NUMLINKS
 184         | FATTR4_WORD1_OWNER
 185         | FATTR4_WORD1_OWNER_GROUP
 186         | FATTR4_WORD1_RAWDEV
 187         | FATTR4_WORD1_SPACE_USED
 188         | FATTR4_WORD1_TIME_ACCESS
 189         | FATTR4_WORD1_TIME_METADATA
 190         | FATTR4_WORD1_TIME_MODIFY,
 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 192         FATTR4_WORD2_SECURITY_LABEL
 193 #endif
 194 };
 195
 196 static const u32 nfs4_pnfs_open_bitmap[3] = {
 197         FATTR4_WORD0_TYPE
 198         | FATTR4_WORD0_CHANGE
 199         | FATTR4_WORD0_SIZE
 200         | FATTR4_WORD0_FSID
 201         | FATTR4_WORD0_FILEID,
 202         FATTR4_WORD1_MODE
 203         | FATTR4_WORD1_NUMLINKS
 204         | FATTR4_WORD1_OWNER
 205         | FATTR4_WORD1_OWNER_GROUP
 206         | FATTR4_WORD1_RAWDEV
 207         | FATTR4_WORD1_SPACE_USED
 208         | FATTR4_WORD1_TIME_ACCESS
 209         | FATTR4_WORD1_TIME_METADATA
 210         | FATTR4_WORD1_TIME_MODIFY,
 211         FATTR4_WORD2_MDSTHRESHOLD
 212 };
 213
 214 static const u32 nfs4_open_noattr_bitmap[3] = {
 215         FATTR4_WORD0_TYPE
 216         | FATTR4_WORD0_CHANGE
 217         | FATTR4_WORD0_FILEID,
 218 };
 219
 220 const u32 nfs4_statfs_bitmap[3] = {
 221         FATTR4_WORD0_FILES_AVAIL
 222         | FATTR4_WORD0_FILES_FREE
 223         | FATTR4_WORD0_FILES_TOTAL,
 224         FATTR4_WORD1_SPACE_AVAIL
 225         | FATTR4_WORD1_SPACE_FREE
 226         | FATTR4_WORD1_SPACE_TOTAL
 227 };
 228
 229 const u32 nfs4_pathconf_bitmap[3] = {
 230         FATTR4_WORD0_MAXLINK
 231         | FATTR4_WORD0_MAXNAME,
 232         0
 233 };
 234
 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 236                         | FATTR4_WORD0_MAXREAD
 237                         | FATTR4_WORD0_MAXWRITE
 238                         | FATTR4_WORD0_LEASE_TIME,
 239                         FATTR4_WORD1_TIME_DELTA
 240                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 241                         FATTR4_WORD2_LAYOUT_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static long nfs4_update_delay(long *timeout)
 318 {
 319         long ret;
 320         if (!timeout)
 321                 return NFS4_POLL_RETRY_MAX;
 322         if (*timeout <= 0)
 323                 *timeout = NFS4_POLL_RETRY_MIN;
 324         if (*timeout > NFS4_POLL_RETRY_MAX)
 325                 *timeout = NFS4_POLL_RETRY_MAX;
 326         ret = *timeout;
 327         *timeout <<= 1;
 328         return ret;
 329 }
 330
 331 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 332 {
 333         int res = 0;
 334
 335         might_sleep();
 336
 337         freezable_schedule_timeout_killable_unsafe(
 338                 nfs4_update_delay(timeout));
 339         if (fatal_signal_pending(current))
 340                 res = -ERESTARTSYS;
 341         return res;
 342 }
 343
 344 /* This is the error handling routine for processes that are allowed
 345  * to sleep.
 346  */
 347 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 348 {
 349         struct nfs_client *clp = server->nfs_client;
 350         struct nfs4_state *state = exception->state;
 351         struct inode *inode = exception->inode;
 352         int ret = errorcode;
 353
 354         exception->retry = 0;
 355         switch(errorcode) {
 356                 case 0:
 357                         return 0;
 358                 case -NFS4ERR_OPENMODE:
 359                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 360                                 nfs4_inode_return_delegation(inode);
 361                                 exception->retry = 1;
 362                                 return 0;
 363                         }
 364                         if (state == NULL)
 365                                 break;
 366                         ret = nfs4_schedule_stateid_recovery(server, state);
 367                         if (ret < 0)
 368                                 break;
 369                         goto wait_on_recovery;
 370                 case -NFS4ERR_DELEG_REVOKED:
 371                 case -NFS4ERR_ADMIN_REVOKED:
 372                 case -NFS4ERR_BAD_STATEID:
 373                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 374                                 nfs_remove_bad_delegation(inode);
 375                                 exception->retry = 1;
 376                                 break;
 377                         }
 378                         if (state == NULL)
 379                                 break;
 380                         ret = nfs4_schedule_stateid_recovery(server, state);
 381                         if (ret < 0)
 382                                 break;
 383                         goto wait_on_recovery;
 384                 case -NFS4ERR_EXPIRED:
 385                         if (state != NULL) {
 386                                 ret = nfs4_schedule_stateid_recovery(server, state);
 387                                 if (ret < 0)
 388                                         break;
 389                         }
 390                 case -NFS4ERR_STALE_STATEID:
 391                 case -NFS4ERR_STALE_CLIENTID:
 392                         nfs4_schedule_lease_recovery(clp);
 393                         goto wait_on_recovery;
 394                 case -NFS4ERR_MOVED:
 395                         ret = nfs4_schedule_migration_recovery(server);
 396                         if (ret < 0)
 397                                 break;
 398                         goto wait_on_recovery;
 399                 case -NFS4ERR_LEASE_MOVED:
 400                         nfs4_schedule_lease_moved_recovery(clp);
 401                         goto wait_on_recovery;
 402 #if defined(CONFIG_NFS_V4_1)
 403                 case -NFS4ERR_BADSESSION:
 404                 case -NFS4ERR_BADSLOT:
 405                 case -NFS4ERR_BAD_HIGH_SLOT:
 406                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 407                 case -NFS4ERR_DEADSESSION:
 408                 case -NFS4ERR_SEQ_FALSE_RETRY:
 409                 case -NFS4ERR_SEQ_MISORDERED:
 410                         dprintk("%s ERROR: %d Reset session\n", __func__,
 411                                 errorcode);
 412                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 413                         goto wait_on_recovery;
 414 #endif /* defined(CONFIG_NFS_V4_1) */
 415                 case -NFS4ERR_FILE_OPEN:
 416                         if (exception->timeout > HZ) {
 417                                 /* We have retried a decent amount, time to
 418                                  * fail
 419                                  */
 420                                 ret = -EBUSY;
 421                                 break;
 422                         }
 423                 case -NFS4ERR_GRACE:
 424                 case -NFS4ERR_DELAY:
 425                         ret = nfs4_delay(server->client, &exception->timeout);
 426                         if (ret != 0)
 427                                 break;
 428                 case -NFS4ERR_RETRY_UNCACHED_REP:
 429                 case -NFS4ERR_OLD_STATEID:
 430                         exception->retry = 1;
 431                         break;
 432                 case -NFS4ERR_BADOWNER:
 433                         /* The following works around a Linux server bug! */
 434                 case -NFS4ERR_BADNAME:
 435                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 436                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 437                                 exception->retry = 1;
 438                                 printk(KERN_WARNING "NFS: v4 server %s "
 439                                                 "does not accept raw "
 440                                                 "uid/gids. "
 441                                                 "Reenabling the idmapper.\n",
 442                                                 server->nfs_client->cl_hostname);
 443                         }
 444         }
 445         /* We failed to handle the error */
 446         return nfs4_map_errors(ret);
 447 wait_on_recovery:
 448         ret = nfs4_wait_clnt_recover(clp);
 449         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 450                 return -EIO;
 451         if (ret == 0)
 452                 exception->retry = 1;
 453         return ret;
 454 }
 455
 456 /*
 457  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 458  * or 'false' otherwise.
 459  */
 460 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 461 {
 462         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 463
 464         if (flavor == RPC_AUTH_GSS_KRB5I ||
 465             flavor == RPC_AUTH_GSS_KRB5P)
 466                 return true;
 467
 468         return false;
 469 }
 470
 471 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 472 {
 473         spin_lock(&clp->cl_lock);
 474         if (time_before(clp->cl_last_renewal,timestamp))
 475                 clp->cl_last_renewal = timestamp;
 476         spin_unlock(&clp->cl_lock);
 477 }
 478
 479 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 480 {
 481         do_renew_lease(server->nfs_client, timestamp);
 482 }
 483
 484 struct nfs4_call_sync_data {
 485         const struct nfs_server *seq_server;
 486         struct nfs4_sequence_args *seq_args;
 487         struct nfs4_sequence_res *seq_res;
 488 };
 489
 490 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 491                                struct nfs4_sequence_res *res, int cache_reply)
 492 {
 493         args->sa_slot = NULL;
 494         args->sa_cache_this = cache_reply;
 495         args->sa_privileged = 0;
 496
 497         res->sr_slot = NULL;
 498 }
 499
 500 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 501 {
 502         args->sa_privileged = 1;
 503 }
 504
 505 static int nfs40_setup_sequence(const struct nfs_server *server,
 506                                 struct nfs4_sequence_args *args,
 507                                 struct nfs4_sequence_res *res,
 508                                 struct rpc_task *task)
 509 {
 510         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 511         struct nfs4_slot *slot;
 512
 513         /* slot already allocated? */
 514         if (res->sr_slot != NULL)
 515                 goto out_start;
 516
 517         spin_lock(&tbl->slot_tbl_lock);
 518         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 519                 goto out_sleep;
 520
 521         slot = nfs4_alloc_slot(tbl);
 522         if (IS_ERR(slot)) {
 523                 if (slot == ERR_PTR(-ENOMEM))
 524                         task->tk_timeout = HZ >> 2;
 525                 goto out_sleep;
 526         }
 527         spin_unlock(&tbl->slot_tbl_lock);
 528
 529         args->sa_slot = slot;
 530         res->sr_slot = slot;
 531
 532 out_start:
 533         rpc_call_start(task);
 534         return 0;
 535
 536 out_sleep:
 537         if (args->sa_privileged)
 538                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 539                                 NULL, RPC_PRIORITY_PRIVILEGED);
 540         else
 541                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 542         spin_unlock(&tbl->slot_tbl_lock);
 543         return -EAGAIN;
 544 }
 545
 546 static int nfs40_sequence_done(struct rpc_task *task,
 547                                struct nfs4_sequence_res *res)
 548 {
 549         struct nfs4_slot *slot = res->sr_slot;
 550         struct nfs4_slot_table *tbl;
 551
 552         if (slot == NULL)
 553                 goto out;
 554
 555         tbl = slot->table;
 556         spin_lock(&tbl->slot_tbl_lock);
 557         if (!nfs41_wake_and_assign_slot(tbl, slot))
 558                 nfs4_free_slot(tbl, slot);
 559         spin_unlock(&tbl->slot_tbl_lock);
 560
 561         res->sr_slot = NULL;
 562 out:
 563         return 1;
 564 }
 565
 566 #if defined(CONFIG_NFS_V4_1)
 567
 568 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 569 {
 570         struct nfs4_session *session;
 571         struct nfs4_slot_table *tbl;
 572         struct nfs4_slot *slot = res->sr_slot;
 573         bool send_new_highest_used_slotid = false;
 574
 575         tbl = slot->table;
 576         session = tbl->session;
 577
 578         spin_lock(&tbl->slot_tbl_lock);
 579         /* Be nice to the server: try to ensure that the last transmitted
 580          * value for highest_user_slotid <= target_highest_slotid
 581          */
 582         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 583                 send_new_highest_used_slotid = true;
 584
 585         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 586                 send_new_highest_used_slotid = false;
 587                 goto out_unlock;
 588         }
 589         nfs4_free_slot(tbl, slot);
 590
 591         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 592                 send_new_highest_used_slotid = false;
 593 out_unlock:
 594         spin_unlock(&tbl->slot_tbl_lock);
 595         res->sr_slot = NULL;
 596         if (send_new_highest_used_slotid)
 597                 nfs41_server_notify_highest_slotid_update(session->clp);
 598 }
 599
 600 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 601 {
 602         struct nfs4_session *session;
 603         struct nfs4_slot *slot = res->sr_slot;
 604         struct nfs_client *clp;
 605         bool interrupted = false;
 606         int ret = 1;
 607
 608         if (slot == NULL)
 609                 goto out_noaction;
 610         /* don't increment the sequence number if the task wasn't sent */
 611         if (!RPC_WAS_SENT(task))
 612                 goto out;
 613
 614         session = slot->table->session;
 615
 616         if (slot->interrupted) {
 617                 slot->interrupted = 0;
 618                 interrupted = true;
 619         }
 620
 621         trace_nfs4_sequence_done(session, res);
 622         /* Check the SEQUENCE operation status */
 623         switch (res->sr_status) {
 624         case 0:
 625                 /* Update the slot's sequence and clientid lease timer */
 626                 ++slot->seq_nr;
 627                 clp = session->clp;
 628                 do_renew_lease(clp, res->sr_timestamp);
 629                 /* Check sequence flags */
 630                 if (res->sr_status_flags != 0)
 631                         nfs4_schedule_lease_recovery(clp);
 632                 nfs41_update_target_slotid(slot->table, slot, res);
 633                 break;
 634         case 1:
 635                 /*
 636                  * sr_status remains 1 if an RPC level error occurred.
 637                  * The server may or may not have processed the sequence
 638                  * operation..
 639                  * Mark the slot as having hosted an interrupted RPC call.
 640                  */
 641                 slot->interrupted = 1;
 642                 goto out;
 643         case -NFS4ERR_DELAY:
 644                 /* The server detected a resend of the RPC call and
 645                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 646                  * of RFC5661.
 647                  */
 648                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 649                         __func__,
 650                         slot->slot_nr,
 651                         slot->seq_nr);
 652                 goto out_retry;
 653         case -NFS4ERR_BADSLOT:
 654                 /*
 655                  * The slot id we used was probably retired. Try again
 656                  * using a different slot id.
 657                  */
 658                 goto retry_nowait;
 659         case -NFS4ERR_SEQ_MISORDERED:
 660                 /*
 661                  * Was the last operation on this sequence interrupted?
 662                  * If so, retry after bumping the sequence number.
 663                  */
 664                 if (interrupted) {
 665                         ++slot->seq_nr;
 666                         goto retry_nowait;
 667                 }
 668                 /*
 669                  * Could this slot have been previously retired?
 670                  * If so, then the server may be expecting seq_nr = 1!
 671                  */
 672                 if (slot->seq_nr != 1) {
 673                         slot->seq_nr = 1;
 674                         goto retry_nowait;
 675                 }
 676                 break;
 677         case -NFS4ERR_SEQ_FALSE_RETRY:
 678                 ++slot->seq_nr;
 679                 goto retry_nowait;
 680         default:
 681                 /* Just update the slot sequence no. */
 682                 ++slot->seq_nr;
 683         }
 684 out:
 685         /* The session may be reset by one of the error handlers. */
 686         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 687         nfs41_sequence_free_slot(res);
 688 out_noaction:
 689         return ret;
 690 retry_nowait:
 691         if (rpc_restart_call_prepare(task)) {
 692                 task->tk_status = 0;
 693                 ret = 0;
 694         }
 695         goto out;
 696 out_retry:
 697         if (!rpc_restart_call(task))
 698                 goto out;
 699         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 700         return 0;
 701 }
 702 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 703
 704 static int nfs4_sequence_done(struct rpc_task *task,
 705                                struct nfs4_sequence_res *res)
 706 {
 707         if (res->sr_slot == NULL)
 708                 return 1;
 709         if (!res->sr_slot->table->session)
 710                 return nfs40_sequence_done(task, res);
 711         return nfs41_sequence_done(task, res);
 712 }
 713
 714 int nfs41_setup_sequence(struct nfs4_session *session,
 715                                 struct nfs4_sequence_args *args,
 716                                 struct nfs4_sequence_res *res,
 717                                 struct rpc_task *task)
 718 {
 719         struct nfs4_slot *slot;
 720         struct nfs4_slot_table *tbl;
 721
 722         dprintk("--> %s\n", __func__);
 723         /* slot already allocated? */
 724         if (res->sr_slot != NULL)
 725                 goto out_success;
 726
 727         tbl = &session->fc_slot_table;
 728
 729         task->tk_timeout = 0;
 730
 731         spin_lock(&tbl->slot_tbl_lock);
 732         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 733             !args->sa_privileged) {
 734                 /* The state manager will wait until the slot table is empty */
 735                 dprintk("%s session is draining\n", __func__);
 736                 goto out_sleep;
 737         }
 738
 739         slot = nfs4_alloc_slot(tbl);
 740         if (IS_ERR(slot)) {
 741                 /* If out of memory, try again in 1/4 second */
 742                 if (slot == ERR_PTR(-ENOMEM))
 743                         task->tk_timeout = HZ >> 2;
 744                 dprintk("<-- %s: no free slots\n", __func__);
 745                 goto out_sleep;
 746         }
 747         spin_unlock(&tbl->slot_tbl_lock);
 748
 749         args->sa_slot = slot;
 750
 751         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 752                         slot->slot_nr, slot->seq_nr);
 753
 754         res->sr_slot = slot;
 755         res->sr_timestamp = jiffies;
 756         res->sr_status_flags = 0;
 757         /*
 758          * sr_status is only set in decode_sequence, and so will remain
 759          * set to 1 if an rpc level failure occurs.
 760          */
 761         res->sr_status = 1;
 762         trace_nfs4_setup_sequence(session, args);
 763 out_success:
 764         rpc_call_start(task);
 765         return 0;
 766 out_sleep:
 767         /* Privileged tasks are queued with top priority */
 768         if (args->sa_privileged)
 769                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 770                                 NULL, RPC_PRIORITY_PRIVILEGED);
 771         else
 772                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 773         spin_unlock(&tbl->slot_tbl_lock);
 774         return -EAGAIN;
 775 }
 776 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 777
 778 static int nfs4_setup_sequence(const struct nfs_server *server,
 779                                struct nfs4_sequence_args *args,
 780                                struct nfs4_sequence_res *res,
 781                                struct rpc_task *task)
 782 {
 783         struct nfs4_session *session = nfs4_get_session(server);
 784         int ret = 0;
 785
 786         if (!session)
 787                 return nfs40_setup_sequence(server, args, res, task);
 788
 789         dprintk("--> %s clp %p session %p sr_slot %u\n",
 790                 __func__, session->clp, session, res->sr_slot ?
 791                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 792
 793         ret = nfs41_setup_sequence(session, args, res, task);
 794
 795         dprintk("<-- %s status=%d\n", __func__, ret);
 796         return ret;
 797 }
 798
 799 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 800 {
 801         struct nfs4_call_sync_data *data = calldata;
 802         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 803
 804         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 805
 806         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 807 }
 808
 809 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 810 {
 811         struct nfs4_call_sync_data *data = calldata;
 812
 813         nfs41_sequence_done(task, data->seq_res);
 814 }
 815
 816 static const struct rpc_call_ops nfs41_call_sync_ops = {
 817         .rpc_call_prepare = nfs41_call_sync_prepare,
 818         .rpc_call_done = nfs41_call_sync_done,
 819 };
 820
 821 #else   /* !CONFIG_NFS_V4_1 */
 822
 823 static int nfs4_setup_sequence(const struct nfs_server *server,
 824                                struct nfs4_sequence_args *args,
 825                                struct nfs4_sequence_res *res,
 826                                struct rpc_task *task)
 827 {
 828         return nfs40_setup_sequence(server, args, res, task);
 829 }
 830
 831 static int nfs4_sequence_done(struct rpc_task *task,
 832                                struct nfs4_sequence_res *res)
 833 {
 834         return nfs40_sequence_done(task, res);
 835 }
 836
 837 #endif  /* !CONFIG_NFS_V4_1 */
 838
 839 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 840 {
 841         struct nfs4_call_sync_data *data = calldata;
 842         nfs4_setup_sequence(data->seq_server,
 843                                 data->seq_args, data->seq_res, task);
 844 }
 845
 846 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 847 {
 848         struct nfs4_call_sync_data *data = calldata;
 849         nfs4_sequence_done(task, data->seq_res);
 850 }
 851
 852 static const struct rpc_call_ops nfs40_call_sync_ops = {
 853         .rpc_call_prepare = nfs40_call_sync_prepare,
 854         .rpc_call_done = nfs40_call_sync_done,
 855 };
 856
 857 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 858                                    struct nfs_server *server,
 859                                    struct rpc_message *msg,
 860                                    struct nfs4_sequence_args *args,
 861                                    struct nfs4_sequence_res *res)
 862 {
 863         int ret;
 864         struct rpc_task *task;
 865         struct nfs_client *clp = server->nfs_client;
 866         struct nfs4_call_sync_data data = {
 867                 .seq_server = server,
 868                 .seq_args = args,
 869                 .seq_res = res,
 870         };
 871         struct rpc_task_setup task_setup = {
 872                 .rpc_client = clnt,
 873                 .rpc_message = msg,
 874                 .callback_ops = clp->cl_mvops->call_sync_ops,
 875                 .callback_data = &data
 876         };
 877
 878         task = rpc_run_task(&task_setup);
 879         if (IS_ERR(task))
 880                 ret = PTR_ERR(task);
 881         else {
 882                 ret = task->tk_status;
 883                 rpc_put_task(task);
 884         }
 885         return ret;
 886 }
 887
 888 int nfs4_call_sync(struct rpc_clnt *clnt,
 889                    struct nfs_server *server,
 890                    struct rpc_message *msg,
 891                    struct nfs4_sequence_args *args,
 892                    struct nfs4_sequence_res *res,
 893                    int cache_reply)
 894 {
 895         nfs4_init_sequence(args, res, cache_reply);
 896         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 897 }
 898
 899 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 900 {
 901         struct nfs_inode *nfsi = NFS_I(dir);
 902
 903         spin_lock(&dir->i_lock);
 904         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 905         if (!cinfo->atomic || cinfo->before != dir->i_version)
 906                 nfs_force_lookup_revalidate(dir);
 907         dir->i_version = cinfo->after;
 908         nfs_fscache_invalidate(dir);
 909         spin_unlock(&dir->i_lock);
 910 }
 911
 912 struct nfs4_opendata {
 913         struct kref kref;
 914         struct nfs_openargs o_arg;
 915         struct nfs_openres o_res;
 916         struct nfs_open_confirmargs c_arg;
 917         struct nfs_open_confirmres c_res;
 918         struct nfs4_string owner_name;
 919         struct nfs4_string group_name;
 920         struct nfs_fattr f_attr;
 921         struct nfs4_label *f_label;
 922         struct dentry *dir;
 923         struct dentry *dentry;
 924         struct nfs4_state_owner *owner;
 925         struct nfs4_state *state;
 926         struct iattr attrs;
 927         unsigned long timestamp;
 928         unsigned int rpc_done : 1;
 929         unsigned int file_created : 1;
 930         unsigned int is_recover : 1;
 931         int rpc_status;
 932         int cancelled;
 933 };
 934
 935 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 936                 int err, struct nfs4_exception *exception)
 937 {
 938         if (err != -EINVAL)
 939                 return false;
 940         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 941                 return false;
 942         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 943         exception->retry = 1;
 944         return true;
 945 }
 946
 947 static enum open_claim_type4
 948 nfs4_map_atomic_open_claim(struct nfs_server *server,
 949                 enum open_claim_type4 claim)
 950 {
 951         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 952                 return claim;
 953         switch (claim) {
 954         default:
 955                 return claim;
 956         case NFS4_OPEN_CLAIM_FH:
 957                 return NFS4_OPEN_CLAIM_NULL;
 958         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 959                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 960         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 961                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 962         }
 963 }
 964
 965 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 966 {
 967         p->o_res.f_attr = &p->f_attr;
 968         p->o_res.f_label = p->f_label;
 969         p->o_res.seqid = p->o_arg.seqid;
 970         p->c_res.seqid = p->c_arg.seqid;
 971         p->o_res.server = p->o_arg.server;
 972         p->o_res.access_request = p->o_arg.access;
 973         nfs_fattr_init(&p->f_attr);
 974         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 975 }
 976
 977 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 978                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 979                 const struct iattr *attrs,
 980                 struct nfs4_label *label,
 981                 enum open_claim_type4 claim,
 982                 gfp_t gfp_mask)
 983 {
 984         struct dentry *parent = dget_parent(dentry);
 985         struct inode *dir = parent->d_inode;
 986         struct nfs_server *server = NFS_SERVER(dir);
 987         struct nfs4_opendata *p;
 988
 989         p = kzalloc(sizeof(*p), gfp_mask);
 990         if (p == NULL)
 991                 goto err;
 992
 993         p->f_label = nfs4_label_alloc(server, gfp_mask);
 994         if (IS_ERR(p->f_label))
 995                 goto err_free_p;
 996
 997         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 998         if (p->o_arg.seqid == NULL)
 999                 goto err_free_label;
1000         nfs_sb_active(dentry->d_sb);
1001         p->dentry = dget(dentry);
1002         p->dir = parent;
1003         p->owner = sp;
1004         atomic_inc(&sp->so_count);
1005         p->o_arg.open_flags = flags;
1006         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1007         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1008          * will return permission denied for all bits until close */
1009         if (!(flags & O_EXCL)) {
1010                 /* ask server to check for all possible rights as results
1011                  * are cached */
1012                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1013                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1014         }
1015         p->o_arg.clientid = server->nfs_client->cl_clientid;
1016         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1017         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1018         p->o_arg.name = &dentry->d_name;
1019         p->o_arg.server = server;
1020         p->o_arg.bitmask = nfs4_bitmask(server, label);
1021         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1022         p->o_arg.label = label;
1023         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1024         switch (p->o_arg.claim) {
1025         case NFS4_OPEN_CLAIM_NULL:
1026         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1027         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1028                 p->o_arg.fh = NFS_FH(dir);
1029                 break;
1030         case NFS4_OPEN_CLAIM_PREVIOUS:
1031         case NFS4_OPEN_CLAIM_FH:
1032         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1033         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1034                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1035         }
1036         if (attrs != NULL && attrs->ia_valid != 0) {
1037                 __u32 verf[2];
1038
1039                 p->o_arg.u.attrs = &p->attrs;
1040                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1041
1042                 verf[0] = jiffies;
1043                 verf[1] = current->pid;
1044                 memcpy(p->o_arg.u.verifier.data, verf,
1045                                 sizeof(p->o_arg.u.verifier.data));
1046         }
1047         p->c_arg.fh = &p->o_res.fh;
1048         p->c_arg.stateid = &p->o_res.stateid;
1049         p->c_arg.seqid = p->o_arg.seqid;
1050         nfs4_init_opendata_res(p);
1051         kref_init(&p->kref);
1052         return p;
1053
1054 err_free_label:
1055         nfs4_label_free(p->f_label);
1056 err_free_p:
1057         kfree(p);
1058 err:
1059         dput(parent);
1060         return NULL;
1061 }
1062
1063 static void nfs4_opendata_free(struct kref *kref)
1064 {
1065         struct nfs4_opendata *p = container_of(kref,
1066                         struct nfs4_opendata, kref);
1067         struct super_block *sb = p->dentry->d_sb;
1068
1069         nfs_free_seqid(p->o_arg.seqid);
1070         if (p->state != NULL)
1071                 nfs4_put_open_state(p->state);
1072         nfs4_put_state_owner(p->owner);
1073
1074         nfs4_label_free(p->f_label);
1075
1076         dput(p->dir);
1077         dput(p->dentry);
1078         nfs_sb_deactive(sb);
1079         nfs_fattr_free_names(&p->f_attr);
1080         kfree(p->f_attr.mdsthreshold);
1081         kfree(p);
1082 }
1083
1084 static void nfs4_opendata_put(struct nfs4_opendata *p)
1085 {
1086         if (p != NULL)
1087                 kref_put(&p->kref, nfs4_opendata_free);
1088 }
1089
1090 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1091 {
1092         int ret;
1093
1094         ret = rpc_wait_for_completion_task(task);
1095         return ret;
1096 }
1097
1098 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1099 {
1100         int ret = 0;
1101
1102         if (open_mode & (O_EXCL|O_TRUNC))
1103                 goto out;
1104         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1105                 case FMODE_READ:
1106                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1107                                 && state->n_rdonly != 0;
1108                         break;
1109                 case FMODE_WRITE:
1110                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1111                                 && state->n_wronly != 0;
1112                         break;
1113                 case FMODE_READ|FMODE_WRITE:
1114                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1115                                 && state->n_rdwr != 0;
1116         }
1117 out:
1118         return ret;
1119 }
1120
1121 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1122 {
1123         if (delegation == NULL)
1124                 return 0;
1125         if ((delegation->type & fmode) != fmode)
1126                 return 0;
1127         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1128                 return 0;
1129         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1130                 return 0;
1131         nfs_mark_delegation_referenced(delegation);
1132         return 1;
1133 }
1134
1135 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1136 {
1137         switch (fmode) {
1138                 case FMODE_WRITE:
1139                         state->n_wronly++;
1140                         break;
1141                 case FMODE_READ:
1142                         state->n_rdonly++;
1143                         break;
1144                 case FMODE_READ|FMODE_WRITE:
1145                         state->n_rdwr++;
1146         }
1147         nfs4_state_set_mode_locked(state, state->state | fmode);
1148 }
1149
1150 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1151 {
1152         struct nfs_client *clp = state->owner->so_server->nfs_client;
1153         bool need_recover = false;
1154
1155         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1156                 need_recover = true;
1157         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1158                 need_recover = true;
1159         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1160                 need_recover = true;
1161         if (need_recover)
1162                 nfs4_state_mark_reclaim_nograce(clp, state);
1163 }
1164
1165 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1166                 nfs4_stateid *stateid)
1167 {
1168         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1169                 return true;
1170         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1171                 nfs_test_and_clear_all_open_stateid(state);
1172                 return true;
1173         }
1174         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1175                 return true;
1176         return false;
1177 }
1178
1179 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1180                 nfs4_stateid *stateid, fmode_t fmode)
1181 {
1182         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1183         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1184         case FMODE_WRITE:
1185                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1186                 break;
1187         case FMODE_READ:
1188                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1189                 break;
1190         case 0:
1191                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1192                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1193                 clear_bit(NFS_OPEN_STATE, &state->flags);
1194         }
1195         if (stateid == NULL)
1196                 return;
1197         if (!nfs_need_update_open_stateid(state, stateid))
1198                 return;
1199         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1200                 nfs4_stateid_copy(&state->stateid, stateid);
1201         nfs4_stateid_copy(&state->open_stateid, stateid);
1202 }
1203
1204 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1205 {
1206         write_seqlock(&state->seqlock);
1207         nfs_clear_open_stateid_locked(state, stateid, fmode);
1208         write_sequnlock(&state->seqlock);
1209         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1210                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1211 }
1212
1213 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1214 {
1215         switch (fmode) {
1216                 case FMODE_READ:
1217                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1218                         break;
1219                 case FMODE_WRITE:
1220                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1221                         break;
1222                 case FMODE_READ|FMODE_WRITE:
1223                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1224         }
1225         if (!nfs_need_update_open_stateid(state, stateid))
1226                 return;
1227         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1228                 nfs4_stateid_copy(&state->stateid, stateid);
1229         nfs4_stateid_copy(&state->open_stateid, stateid);
1230 }
1231
1232 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1233 {
1234         /*
1235          * Protect the call to nfs4_state_set_mode_locked and
1236          * serialise the stateid update
1237          */
1238         write_seqlock(&state->seqlock);
1239         if (deleg_stateid != NULL) {
1240                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1241                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1242         }
1243         if (open_stateid != NULL)
1244                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1245         write_sequnlock(&state->seqlock);
1246         spin_lock(&state->owner->so_lock);
1247         update_open_stateflags(state, fmode);
1248         spin_unlock(&state->owner->so_lock);
1249 }
1250
1251 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1252 {
1253         struct nfs_inode *nfsi = NFS_I(state->inode);
1254         struct nfs_delegation *deleg_cur;
1255         int ret = 0;
1256
1257         fmode &= (FMODE_READ|FMODE_WRITE);
1258
1259         rcu_read_lock();
1260         deleg_cur = rcu_dereference(nfsi->delegation);
1261         if (deleg_cur == NULL)
1262                 goto no_delegation;
1263
1264         spin_lock(&deleg_cur->lock);
1265         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1266            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1267             (deleg_cur->type & fmode) != fmode)
1268                 goto no_delegation_unlock;
1269
1270         if (delegation == NULL)
1271                 delegation = &deleg_cur->stateid;
1272         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1273                 goto no_delegation_unlock;
1274
1275         nfs_mark_delegation_referenced(deleg_cur);
1276         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1277         ret = 1;
1278 no_delegation_unlock:
1279         spin_unlock(&deleg_cur->lock);
1280 no_delegation:
1281         rcu_read_unlock();
1282
1283         if (!ret && open_stateid != NULL) {
1284                 __update_open_stateid(state, open_stateid, NULL, fmode);
1285                 ret = 1;
1286         }
1287         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1288                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1289
1290         return ret;
1291 }
1292
1293
1294 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1295 {
1296         struct nfs_delegation *delegation;
1297
1298         rcu_read_lock();
1299         delegation = rcu_dereference(NFS_I(inode)->delegation);
1300         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1301                 rcu_read_unlock();
1302                 return;
1303         }
1304         rcu_read_unlock();
1305         nfs4_inode_return_delegation(inode);
1306 }
1307
1308 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1309 {
1310         struct nfs4_state *state = opendata->state;
1311         struct nfs_inode *nfsi = NFS_I(state->inode);
1312         struct nfs_delegation *delegation;
1313         int open_mode = opendata->o_arg.open_flags;
1314         fmode_t fmode = opendata->o_arg.fmode;
1315         nfs4_stateid stateid;
1316         int ret = -EAGAIN;
1317
1318         for (;;) {
1319                 spin_lock(&state->owner->so_lock);
1320                 if (can_open_cached(state, fmode, open_mode)) {
1321                         update_open_stateflags(state, fmode);
1322                         spin_unlock(&state->owner->so_lock);
1323                         goto out_return_state;
1324                 }
1325                 spin_unlock(&state->owner->so_lock);
1326                 rcu_read_lock();
1327                 delegation = rcu_dereference(nfsi->delegation);
1328                 if (!can_open_delegated(delegation, fmode)) {
1329                         rcu_read_unlock();
1330                         break;
1331                 }
1332                 /* Save the delegation */
1333                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1334                 rcu_read_unlock();
1335                 nfs_release_seqid(opendata->o_arg.seqid);
1336                 if (!opendata->is_recover) {
1337                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1338                         if (ret != 0)
1339                                 goto out;
1340                 }
1341                 ret = -EAGAIN;
1342
1343                 /* Try to update the stateid using the delegation */
1344                 if (update_open_stateid(state, NULL, &stateid, fmode))
1345                         goto out_return_state;
1346         }
1347 out:
1348         return ERR_PTR(ret);
1349 out_return_state:
1350         atomic_inc(&state->count);
1351         return state;
1352 }
1353
1354 static void
1355 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1356 {
1357         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1358         struct nfs_delegation *delegation;
1359         int delegation_flags = 0;
1360
1361         rcu_read_lock();
1362         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1363         if (delegation)
1364                 delegation_flags = delegation->flags;
1365         rcu_read_unlock();
1366         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1367                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1368                                    "returning a delegation for "
1369                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1370                                    clp->cl_hostname);
1371         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1372                 nfs_inode_set_delegation(state->inode,
1373                                          data->owner->so_cred,
1374                                          &data->o_res);
1375         else
1376                 nfs_inode_reclaim_delegation(state->inode,
1377                                              data->owner->so_cred,
1378                                              &data->o_res);
1379 }
1380
1381 /*
1382  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1383  * and update the nfs4_state.
1384  */
1385 static struct nfs4_state *
1386 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1387 {
1388         struct inode *inode = data->state->inode;
1389         struct nfs4_state *state = data->state;
1390         int ret;
1391
1392         if (!data->rpc_done) {
1393                 if (data->rpc_status) {
1394                         ret = data->rpc_status;
1395                         goto err;
1396                 }
1397                 /* cached opens have already been processed */
1398                 goto update;
1399         }
1400
1401         ret = nfs_refresh_inode(inode, &data->f_attr);
1402         if (ret)
1403                 goto err;
1404
1405         if (data->o_res.delegation_type != 0)
1406                 nfs4_opendata_check_deleg(data, state);
1407 update:
1408         update_open_stateid(state, &data->o_res.stateid, NULL,
1409                             data->o_arg.fmode);
1410         atomic_inc(&state->count);
1411
1412         return state;
1413 err:
1414         return ERR_PTR(ret);
1415
1416 }
1417
1418 static struct nfs4_state *
1419 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1420 {
1421         struct inode *inode;
1422         struct nfs4_state *state = NULL;
1423         int ret;
1424
1425         if (!data->rpc_done) {
1426                 state = nfs4_try_open_cached(data);
1427                 goto out;
1428         }
1429
1430         ret = -EAGAIN;
1431         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1432                 goto err;
1433         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1434         ret = PTR_ERR(inode);
1435         if (IS_ERR(inode))
1436                 goto err;
1437         ret = -ENOMEM;
1438         state = nfs4_get_open_state(inode, data->owner);
1439         if (state == NULL)
1440                 goto err_put_inode;
1441         if (data->o_res.delegation_type != 0)
1442                 nfs4_opendata_check_deleg(data, state);
1443         update_open_stateid(state, &data->o_res.stateid, NULL,
1444                         data->o_arg.fmode);
1445         iput(inode);
1446 out:
1447         nfs_release_seqid(data->o_arg.seqid);
1448         return state;
1449 err_put_inode:
1450         iput(inode);
1451 err:
1452         return ERR_PTR(ret);
1453 }
1454
1455 static struct nfs4_state *
1456 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1457 {
1458         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1459                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1460         return _nfs4_opendata_to_nfs4_state(data);
1461 }
1462
1463 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1464 {
1465         struct nfs_inode *nfsi = NFS_I(state->inode);
1466         struct nfs_open_context *ctx;
1467
1468         spin_lock(&state->inode->i_lock);
1469         list_for_each_entry(ctx, &nfsi->open_files, list) {
1470                 if (ctx->state != state)
1471                         continue;
1472                 get_nfs_open_context(ctx);
1473                 spin_unlock(&state->inode->i_lock);
1474                 return ctx;
1475         }
1476         spin_unlock(&state->inode->i_lock);
1477         return ERR_PTR(-ENOENT);
1478 }
1479
1480 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1481                 struct nfs4_state *state, enum open_claim_type4 claim)
1482 {
1483         struct nfs4_opendata *opendata;
1484
1485         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1486                         NULL, NULL, claim, GFP_NOFS);
1487         if (opendata == NULL)
1488                 return ERR_PTR(-ENOMEM);
1489         opendata->state = state;
1490         atomic_inc(&state->count);
1491         return opendata;
1492 }
1493
1494 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1495 {
1496         struct nfs4_state *newstate;
1497         int ret;
1498
1499         opendata->o_arg.open_flags = 0;
1500         opendata->o_arg.fmode = fmode;
1501         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1502         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1503         nfs4_init_opendata_res(opendata);
1504         ret = _nfs4_recover_proc_open(opendata);
1505         if (ret != 0)
1506                 return ret;
1507         newstate = nfs4_opendata_to_nfs4_state(opendata);
1508         if (IS_ERR(newstate))
1509                 return PTR_ERR(newstate);
1510         nfs4_close_state(newstate, fmode);
1511         *res = newstate;
1512         return 0;
1513 }
1514
1515 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1516 {
1517         struct nfs4_state *newstate;
1518         int ret;
1519
1520         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1521         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1522         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1523         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1524         /* memory barrier prior to reading state->n_* */
1525         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1526         clear_bit(NFS_OPEN_STATE, &state->flags);
1527         smp_rmb();
1528         if (state->n_rdwr != 0) {
1529                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1530                 if (ret != 0)
1531                         return ret;
1532                 if (newstate != state)
1533                         return -ESTALE;
1534         }
1535         if (state->n_wronly != 0) {
1536                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1537                 if (ret != 0)
1538                         return ret;
1539                 if (newstate != state)
1540                         return -ESTALE;
1541         }
1542         if (state->n_rdonly != 0) {
1543                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1544                 if (ret != 0)
1545                         return ret;
1546                 if (newstate != state)
1547                         return -ESTALE;
1548         }
1549         /*
1550          * We may have performed cached opens for all three recoveries.
1551          * Check if we need to update the current stateid.
1552          */
1553         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1554             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1555                 write_seqlock(&state->seqlock);
1556                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1557                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1558                 write_sequnlock(&state->seqlock);
1559         }
1560         return 0;
1561 }
1562
1563 /*
1564  * OPEN_RECLAIM:
1565  *      reclaim state on the server after a reboot.
1566  */
1567 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1568 {
1569         struct nfs_delegation *delegation;
1570         struct nfs4_opendata *opendata;
1571         fmode_t delegation_type = 0;
1572         int status;
1573
1574         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1575                         NFS4_OPEN_CLAIM_PREVIOUS);
1576         if (IS_ERR(opendata))
1577                 return PTR_ERR(opendata);
1578         rcu_read_lock();
1579         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1580         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1581                 delegation_type = delegation->type;
1582         rcu_read_unlock();
1583         opendata->o_arg.u.delegation_type = delegation_type;
1584         status = nfs4_open_recover(opendata, state);
1585         nfs4_opendata_put(opendata);
1586         return status;
1587 }
1588
1589 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1590 {
1591         struct nfs_server *server = NFS_SERVER(state->inode);
1592         struct nfs4_exception exception = { };
1593         int err;
1594         do {
1595                 err = _nfs4_do_open_reclaim(ctx, state);
1596                 trace_nfs4_open_reclaim(ctx, 0, err);
1597                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1598                         continue;
1599                 if (err != -NFS4ERR_DELAY)
1600                         break;
1601                 nfs4_handle_exception(server, err, &exception);
1602         } while (exception.retry);
1603         return err;
1604 }
1605
1606 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1607 {
1608         struct nfs_open_context *ctx;
1609         int ret;
1610
1611         ctx = nfs4_state_find_open_context(state);
1612         if (IS_ERR(ctx))
1613                 return -EAGAIN;
1614         ret = nfs4_do_open_reclaim(ctx, state);
1615         put_nfs_open_context(ctx);
1616         return ret;
1617 }
1618
1619 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1620 {
1621         switch (err) {
1622                 default:
1623                         printk(KERN_ERR "NFS: %s: unhandled error "
1624                                         "%d.\n", __func__, err);
1625                 case 0:
1626                 case -ENOENT:
1627                 case -ESTALE:
1628                         break;
1629                 case -NFS4ERR_BADSESSION:
1630                 case -NFS4ERR_BADSLOT:
1631                 case -NFS4ERR_BAD_HIGH_SLOT:
1632                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1633                 case -NFS4ERR_DEADSESSION:
1634                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1635                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1636                         return -EAGAIN;
1637                 case -NFS4ERR_STALE_CLIENTID:
1638                 case -NFS4ERR_STALE_STATEID:
1639                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1640                 case -NFS4ERR_EXPIRED:
1641                         /* Don't recall a delegation if it was lost */
1642                         nfs4_schedule_lease_recovery(server->nfs_client);
1643                         return -EAGAIN;
1644                 case -NFS4ERR_MOVED:
1645                         nfs4_schedule_migration_recovery(server);
1646                         return -EAGAIN;
1647                 case -NFS4ERR_LEASE_MOVED:
1648                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1649                         return -EAGAIN;
1650                 case -NFS4ERR_DELEG_REVOKED:
1651                 case -NFS4ERR_ADMIN_REVOKED:
1652                 case -NFS4ERR_BAD_STATEID:
1653                 case -NFS4ERR_OPENMODE:
1654                         nfs_inode_find_state_and_recover(state->inode,
1655                                         stateid);
1656                         nfs4_schedule_stateid_recovery(server, state);
1657                         return 0;
1658                 case -NFS4ERR_DELAY:
1659                 case -NFS4ERR_GRACE:
1660                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1661                         ssleep(1);
1662                         return -EAGAIN;
1663                 case -ENOMEM:
1664                 case -NFS4ERR_DENIED:
1665                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1666                         return 0;
1667         }
1668         return err;
1669 }
1670
1671 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1672 {
1673         struct nfs_server *server = NFS_SERVER(state->inode);
1674         struct nfs4_opendata *opendata;
1675         int err;
1676
1677         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1678                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1679         if (IS_ERR(opendata))
1680                 return PTR_ERR(opendata);
1681         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1682         err = nfs4_open_recover(opendata, state);
1683         nfs4_opendata_put(opendata);
1684         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1685 }
1686
1687 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1688 {
1689         struct nfs4_opendata *data = calldata;
1690
1691         nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1692                                 &data->c_res.seq_res, task);
1693 }
1694
1695 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1696 {
1697         struct nfs4_opendata *data = calldata;
1698
1699         nfs40_sequence_done(task, &data->c_res.seq_res);
1700
1701         data->rpc_status = task->tk_status;
1702         if (data->rpc_status == 0) {
1703                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1704                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1705                 renew_lease(data->o_res.server, data->timestamp);
1706                 data->rpc_done = 1;
1707         }
1708 }
1709
1710 static void nfs4_open_confirm_release(void *calldata)
1711 {
1712         struct nfs4_opendata *data = calldata;
1713         struct nfs4_state *state = NULL;
1714
1715         /* If this request hasn't been cancelled, do nothing */
1716         if (data->cancelled == 0)
1717                 goto out_free;
1718         /* In case of error, no cleanup! */
1719         if (!data->rpc_done)
1720                 goto out_free;
1721         state = nfs4_opendata_to_nfs4_state(data);
1722         if (!IS_ERR(state))
1723                 nfs4_close_state(state, data->o_arg.fmode);
1724 out_free:
1725         nfs4_opendata_put(data);
1726 }
1727
1728 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1729         .rpc_call_prepare = nfs4_open_confirm_prepare,
1730         .rpc_call_done = nfs4_open_confirm_done,
1731         .rpc_release = nfs4_open_confirm_release,
1732 };
1733
1734 /*
1735  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1736  */
1737 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1738 {
1739         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1740         struct rpc_task *task;
1741         struct  rpc_message msg = {
1742                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1743                 .rpc_argp = &data->c_arg,
1744                 .rpc_resp = &data->c_res,
1745                 .rpc_cred = data->owner->so_cred,
1746         };
1747         struct rpc_task_setup task_setup_data = {
1748                 .rpc_client = server->client,
1749                 .rpc_message = &msg,
1750                 .callback_ops = &nfs4_open_confirm_ops,
1751                 .callback_data = data,
1752                 .workqueue = nfsiod_workqueue,
1753                 .flags = RPC_TASK_ASYNC,
1754         };
1755         int status;
1756
1757         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1758         kref_get(&data->kref);
1759         data->rpc_done = 0;
1760         data->rpc_status = 0;
1761         data->timestamp = jiffies;
1762         task = rpc_run_task(&task_setup_data);
1763         if (IS_ERR(task))
1764                 return PTR_ERR(task);
1765         status = nfs4_wait_for_completion_rpc_task(task);
1766         if (status != 0) {
1767                 data->cancelled = 1;
1768                 smp_wmb();
1769         } else
1770                 status = data->rpc_status;
1771         rpc_put_task(task);
1772         return status;
1773 }
1774
1775 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1776 {
1777         struct nfs4_opendata *data = calldata;
1778         struct nfs4_state_owner *sp = data->owner;
1779         struct nfs_client *clp = sp->so_server->nfs_client;
1780
1781         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1782                 goto out_wait;
1783         /*
1784          * Check if we still need to send an OPEN call, or if we can use
1785          * a delegation instead.
1786          */
1787         if (data->state != NULL) {
1788                 struct nfs_delegation *delegation;
1789
1790                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1791                         goto out_no_action;
1792                 rcu_read_lock();
1793                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1794                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1795                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1796                     can_open_delegated(delegation, data->o_arg.fmode))
1797                         goto unlock_no_action;
1798                 rcu_read_unlock();
1799         }
1800         /* Update client id. */
1801         data->o_arg.clientid = clp->cl_clientid;
1802         switch (data->o_arg.claim) {
1803         case NFS4_OPEN_CLAIM_PREVIOUS:
1804         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1805         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1806                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1807         case NFS4_OPEN_CLAIM_FH:
1808                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1809                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1810         }
1811         data->timestamp = jiffies;
1812         if (nfs4_setup_sequence(data->o_arg.server,
1813                                 &data->o_arg.seq_args,
1814                                 &data->o_res.seq_res,
1815                                 task) != 0)
1816                 nfs_release_seqid(data->o_arg.seqid);
1817
1818         /* Set the create mode (note dependency on the session type) */
1819         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1820         if (data->o_arg.open_flags & O_EXCL) {
1821                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1822                 if (nfs4_has_persistent_session(clp))
1823                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1824                 else if (clp->cl_mvops->minor_version > 0)
1825                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1826         }
1827         return;
1828 unlock_no_action:
1829         rcu_read_unlock();
1830 out_no_action:
1831         task->tk_action = NULL;
1832 out_wait:
1833         nfs4_sequence_done(task, &data->o_res.seq_res);
1834 }
1835
1836 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1837 {
1838         struct nfs4_opendata *data = calldata;
1839
1840         data->rpc_status = task->tk_status;
1841
1842         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1843                 return;
1844
1845         if (task->tk_status == 0) {
1846                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1847                         switch (data->o_res.f_attr->mode & S_IFMT) {
1848                         case S_IFREG:
1849                                 break;
1850                         case S_IFLNK:
1851                                 data->rpc_status = -ELOOP;
1852                                 break;
1853                         case S_IFDIR:
1854                                 data->rpc_status = -EISDIR;
1855                                 break;
1856                         default:
1857                                 data->rpc_status = -ENOTDIR;
1858                         }
1859                 }
1860                 renew_lease(data->o_res.server, data->timestamp);
1861                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1862                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1863         }
1864         data->rpc_done = 1;
1865 }
1866
1867 static void nfs4_open_release(void *calldata)
1868 {
1869         struct nfs4_opendata *data = calldata;
1870         struct nfs4_state *state = NULL;
1871
1872         /* If this request hasn't been cancelled, do nothing */
1873         if (data->cancelled == 0)
1874                 goto out_free;
1875         /* In case of error, no cleanup! */
1876         if (data->rpc_status != 0 || !data->rpc_done)
1877                 goto out_free;
1878         /* In case we need an open_confirm, no cleanup! */
1879         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1880                 goto out_free;
1881         state = nfs4_opendata_to_nfs4_state(data);
1882         if (!IS_ERR(state))
1883                 nfs4_close_state(state, data->o_arg.fmode);
1884 out_free:
1885         nfs4_opendata_put(data);
1886 }
1887
1888 static const struct rpc_call_ops nfs4_open_ops = {
1889         .rpc_call_prepare = nfs4_open_prepare,
1890         .rpc_call_done = nfs4_open_done,
1891         .rpc_release = nfs4_open_release,
1892 };
1893
1894 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1895 {
1896         struct inode *dir = data->dir->d_inode;
1897         struct nfs_server *server = NFS_SERVER(dir);
1898         struct nfs_openargs *o_arg = &data->o_arg;
1899         struct nfs_openres *o_res = &data->o_res;
1900         struct rpc_task *task;
1901         struct rpc_message msg = {
1902                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1903                 .rpc_argp = o_arg,
1904                 .rpc_resp = o_res,
1905                 .rpc_cred = data->owner->so_cred,
1906         };
1907         struct rpc_task_setup task_setup_data = {
1908                 .rpc_client = server->client,
1909                 .rpc_message = &msg,
1910                 .callback_ops = &nfs4_open_ops,
1911                 .callback_data = data,
1912                 .workqueue = nfsiod_workqueue,
1913                 .flags = RPC_TASK_ASYNC,
1914         };
1915         int status;
1916
1917         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1918         kref_get(&data->kref);
1919         data->rpc_done = 0;
1920         data->rpc_status = 0;
1921         data->cancelled = 0;
1922         data->is_recover = 0;
1923         if (isrecover) {
1924                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1925                 data->is_recover = 1;
1926         }
1927         task = rpc_run_task(&task_setup_data);
1928         if (IS_ERR(task))
1929                 return PTR_ERR(task);
1930         status = nfs4_wait_for_completion_rpc_task(task);
1931         if (status != 0) {
1932                 data->cancelled = 1;
1933                 smp_wmb();
1934         } else
1935                 status = data->rpc_status;
1936         rpc_put_task(task);
1937
1938         return status;
1939 }
1940
1941 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1942 {
1943         struct inode *dir = data->dir->d_inode;
1944         struct nfs_openres *o_res = &data->o_res;
1945         int status;
1946
1947         status = nfs4_run_open_task(data, 1);
1948         if (status != 0 || !data->rpc_done)
1949                 return status;
1950
1951         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1952
1953         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1954                 status = _nfs4_proc_open_confirm(data);
1955                 if (status != 0)
1956                         return status;
1957         }
1958
1959         return status;
1960 }
1961
1962 /*
1963  * Additional permission checks in order to distinguish between an
1964  * open for read, and an open for execute. This works around the
1965  * fact that NFSv4 OPEN treats read and execute permissions as being
1966  * the same.
1967  * Note that in the non-execute case, we want to turn off permission
1968  * checking if we just created a new file (POSIX open() semantics).
1969  */
1970 static int nfs4_opendata_access(struct rpc_cred *cred,
1971                                 struct nfs4_opendata *opendata,
1972                                 struct nfs4_state *state, fmode_t fmode,
1973                                 int openflags)
1974 {
1975         struct nfs_access_entry cache;
1976         u32 mask;
1977
1978         /* access call failed or for some reason the server doesn't
1979          * support any access modes -- defer access call until later */
1980         if (opendata->o_res.access_supported == 0)
1981                 return 0;
1982
1983         mask = 0;
1984         /*
1985          * Use openflags to check for exec, because fmode won't
1986          * always have FMODE_EXEC set when file open for exec.
1987          */
1988         if (openflags & __FMODE_EXEC) {
1989                 /* ONLY check for exec rights */
1990                 mask = MAY_EXEC;
1991         } else if ((fmode & FMODE_READ) && !opendata->file_created)
1992                 mask = MAY_READ;
1993
1994         cache.cred = cred;
1995         cache.jiffies = jiffies;
1996         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1997         nfs_access_add_cache(state->inode, &cache);
1998
1999         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2000                 return 0;
2001
2002         /* even though OPEN succeeded, access is denied. Close the file */
2003         nfs4_close_state(state, fmode);
2004         return -EACCES;
2005 }
2006
2007 /*
2008  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2009  */
2010 static int _nfs4_proc_open(struct nfs4_opendata *data)
2011 {
2012         struct inode *dir = data->dir->d_inode;
2013         struct nfs_server *server = NFS_SERVER(dir);
2014         struct nfs_openargs *o_arg = &data->o_arg;
2015         struct nfs_openres *o_res = &data->o_res;
2016         int status;
2017
2018         status = nfs4_run_open_task(data, 0);
2019         if (!data->rpc_done)
2020                 return status;
2021         if (status != 0) {
2022                 if (status == -NFS4ERR_BADNAME &&
2023                                 !(o_arg->open_flags & O_CREAT))
2024                         return -ENOENT;
2025                 return status;
2026         }
2027
2028         nfs_fattr_map_and_free_names(server, &data->f_attr);
2029
2030         if (o_arg->open_flags & O_CREAT) {
2031                 update_changeattr(dir, &o_res->cinfo);
2032                 if (o_arg->open_flags & O_EXCL)
2033                         data->file_created = 1;
2034                 else if (o_res->cinfo.before != o_res->cinfo.after)
2035                         data->file_created = 1;
2036         }
2037         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2038                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2039         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2040                 status = _nfs4_proc_open_confirm(data);
2041                 if (status != 0)
2042                         return status;
2043         }
2044         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2045                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2046         return 0;
2047 }
2048
2049 static int nfs4_recover_expired_lease(struct nfs_server *server)
2050 {
2051         return nfs4_client_recover_expired_lease(server->nfs_client);
2052 }
2053
2054 /*
2055  * OPEN_EXPIRED:
2056  *      reclaim state on the server after a network partition.
2057  *      Assumes caller holds the appropriate lock
2058  */
2059 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2060 {
2061         struct nfs4_opendata *opendata;
2062         int ret;
2063
2064         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2065                         NFS4_OPEN_CLAIM_FH);
2066         if (IS_ERR(opendata))
2067                 return PTR_ERR(opendata);
2068         ret = nfs4_open_recover(opendata, state);
2069         if (ret == -ESTALE)
2070                 d_drop(ctx->dentry);
2071         nfs4_opendata_put(opendata);
2072         return ret;
2073 }
2074
2075 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2076 {
2077         struct nfs_server *server = NFS_SERVER(state->inode);
2078         struct nfs4_exception exception = { };
2079         int err;
2080
2081         do {
2082                 err = _nfs4_open_expired(ctx, state);
2083                 trace_nfs4_open_expired(ctx, 0, err);
2084                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2085                         continue;
2086                 switch (err) {
2087                 default:
2088                         goto out;
2089                 case -NFS4ERR_GRACE:
2090                 case -NFS4ERR_DELAY:
2091                         nfs4_handle_exception(server, err, &exception);
2092                         err = 0;
2093                 }
2094         } while (exception.retry);
2095 out:
2096         return err;
2097 }
2098
2099 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2100 {
2101         struct nfs_open_context *ctx;
2102         int ret;
2103
2104         ctx = nfs4_state_find_open_context(state);
2105         if (IS_ERR(ctx))
2106                 return -EAGAIN;
2107         ret = nfs4_do_open_expired(ctx, state);
2108         put_nfs_open_context(ctx);
2109         return ret;
2110 }
2111
2112 #if defined(CONFIG_NFS_V4_1)
2113 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2114 {
2115         struct nfs_server *server = NFS_SERVER(state->inode);
2116         nfs4_stateid *stateid = &state->stateid;
2117         struct nfs_delegation *delegation;
2118         struct rpc_cred *cred = NULL;
2119         int status = -NFS4ERR_BAD_STATEID;
2120
2121         /* If a state reset has been done, test_stateid is unneeded */
2122         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2123                 return;
2124
2125         /* Get the delegation credential for use by test/free_stateid */
2126         rcu_read_lock();
2127         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2128         if (delegation != NULL &&
2129             nfs4_stateid_match(&delegation->stateid, stateid)) {
2130                 cred = get_rpccred(delegation->cred);
2131                 rcu_read_unlock();
2132                 status = nfs41_test_stateid(server, stateid, cred);
2133                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2134         } else
2135                 rcu_read_unlock();
2136
2137         if (status != NFS_OK) {
2138                 /* Free the stateid unless the server explicitly
2139                  * informs us the stateid is unrecognized. */
2140                 if (status != -NFS4ERR_BAD_STATEID)
2141                         nfs41_free_stateid(server, stateid, cred);
2142                 nfs_remove_bad_delegation(state->inode);
2143
2144                 write_seqlock(&state->seqlock);
2145                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2146                 write_sequnlock(&state->seqlock);
2147                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2148         }
2149
2150         if (cred != NULL)
2151                 put_rpccred(cred);
2152 }
2153
2154 /**
2155  * nfs41_check_open_stateid - possibly free an open stateid
2156  *
2157  * @state: NFSv4 state for an inode
2158  *
2159  * Returns NFS_OK if recovery for this stateid is now finished.
2160  * Otherwise a negative NFS4ERR value is returned.
2161  */
2162 static int nfs41_check_open_stateid(struct nfs4_state *state)
2163 {
2164         struct nfs_server *server = NFS_SERVER(state->inode);
2165         nfs4_stateid *stateid = &state->open_stateid;
2166         struct rpc_cred *cred = state->owner->so_cred;
2167         int status;
2168
2169         /* If a state reset has been done, test_stateid is unneeded */
2170         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2171             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2172             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2173                 return -NFS4ERR_BAD_STATEID;
2174
2175         status = nfs41_test_stateid(server, stateid, cred);
2176         trace_nfs4_test_open_stateid(state, NULL, status);
2177         if (status != NFS_OK) {
2178                 /* Free the stateid unless the server explicitly
2179                  * informs us the stateid is unrecognized. */
2180                 if (status != -NFS4ERR_BAD_STATEID)
2181                         nfs41_free_stateid(server, stateid, cred);
2182
2183                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2184                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2185                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2186                 clear_bit(NFS_OPEN_STATE, &state->flags);
2187         }
2188         return status;
2189 }
2190
2191 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2192 {
2193         int status;
2194
2195         nfs41_clear_delegation_stateid(state);
2196         status = nfs41_check_open_stateid(state);
2197         if (status != NFS_OK)
2198                 status = nfs4_open_expired(sp, state);
2199         return status;
2200 }
2201 #endif
2202
2203 /*
2204  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2205  * fields corresponding to attributes that were used to store the verifier.
2206  * Make sure we clobber those fields in the later setattr call
2207  */
2208 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2209 {
2210         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2211             !(sattr->ia_valid & ATTR_ATIME_SET))
2212                 sattr->ia_valid |= ATTR_ATIME;
2213
2214         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2215             !(sattr->ia_valid & ATTR_MTIME_SET))
2216                 sattr->ia_valid |= ATTR_MTIME;
2217 }
2218
2219 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2220                 fmode_t fmode,
2221                 int flags,
2222                 struct nfs_open_context *ctx)
2223 {
2224         struct nfs4_state_owner *sp = opendata->owner;
2225         struct nfs_server *server = sp->so_server;
2226         struct dentry *dentry;
2227         struct nfs4_state *state;
2228         unsigned int seq;
2229         int ret;
2230
2231         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2232
2233         ret = _nfs4_proc_open(opendata);
2234         if (ret != 0)
2235                 goto out;
2236
2237         state = nfs4_opendata_to_nfs4_state(opendata);
2238         ret = PTR_ERR(state);
2239         if (IS_ERR(state))
2240                 goto out;
2241         if (server->caps & NFS_CAP_POSIX_LOCK)
2242                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2243
2244         dentry = opendata->dentry;
2245         if (dentry->d_inode == NULL) {
2246                 /* FIXME: Is this d_drop() ever needed? */
2247                 d_drop(dentry);
2248                 dentry = d_add_unique(dentry, igrab(state->inode));
2249                 if (dentry == NULL) {
2250                         dentry = opendata->dentry;
2251                 } else if (dentry != ctx->dentry) {
2252                         dput(ctx->dentry);
2253                         ctx->dentry = dget(dentry);
2254                 }
2255                 nfs_set_verifier(dentry,
2256                                 nfs_save_change_attribute(opendata->dir->d_inode));
2257         }
2258
2259         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2260         if (ret != 0)
2261                 goto out;
2262
2263         ctx->state = state;
2264         if (dentry->d_inode == state->inode) {
2265                 nfs_inode_attach_open_context(ctx);
2266                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2267                         nfs4_schedule_stateid_recovery(server, state);
2268         }
2269 out:
2270         return ret;
2271 }
2272
2273 /*
2274  * Returns a referenced nfs4_state
2275  */
2276 static int _nfs4_do_open(struct inode *dir,
2277                         struct nfs_open_context *ctx,
2278                         int flags,
2279                         struct iattr *sattr,
2280                         struct nfs4_label *label,
2281                         int *opened)
2282 {
2283         struct nfs4_state_owner  *sp;
2284         struct nfs4_state     *state = NULL;
2285         struct nfs_server       *server = NFS_SERVER(dir);
2286         struct nfs4_opendata *opendata;
2287         struct dentry *dentry = ctx->dentry;
2288         struct rpc_cred *cred = ctx->cred;
2289         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2290         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2291         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2292         struct nfs4_label *olabel = NULL;
2293         int status;
2294
2295         /* Protect against reboot recovery conflicts */
2296         status = -ENOMEM;
2297         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2298         if (sp == NULL) {
2299                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2300                 goto out_err;
2301         }
2302         status = nfs4_recover_expired_lease(server);
2303         if (status != 0)
2304                 goto err_put_state_owner;
2305         if (dentry->d_inode != NULL)
2306                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2307         status = -ENOMEM;
2308         if (dentry->d_inode)
2309                 claim = NFS4_OPEN_CLAIM_FH;
2310         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2311                         label, claim, GFP_KERNEL);
2312         if (opendata == NULL)
2313                 goto err_put_state_owner;
2314
2315         if (label) {
2316                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2317                 if (IS_ERR(olabel)) {
2318                         status = PTR_ERR(olabel);
2319                         goto err_opendata_put;
2320                 }
2321         }
2322
2323         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2324                 if (!opendata->f_attr.mdsthreshold) {
2325                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2326                         if (!opendata->f_attr.mdsthreshold)
2327                                 goto err_free_label;
2328                 }
2329                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2330         }
2331         if (dentry->d_inode != NULL)
2332                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2333
2334         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2335         if (status != 0)
2336                 goto err_free_label;
2337         state = ctx->state;
2338
2339         if ((opendata->o_arg.open_flags & O_EXCL) &&
2340             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2341                 nfs4_exclusive_attrset(opendata, sattr);
2342
2343                 nfs_fattr_init(opendata->o_res.f_attr);
2344                 status = nfs4_do_setattr(state->inode, cred,
2345                                 opendata->o_res.f_attr, sattr,
2346                                 state, label, olabel);
2347                 if (status == 0) {
2348                         nfs_setattr_update_inode(state->inode, sattr);
2349                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2350                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2351                 }
2352         }
2353         if (opendata->file_created)
2354                 *opened |= FILE_CREATED;
2355
2356         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2357                 *ctx_th = opendata->f_attr.mdsthreshold;
2358                 opendata->f_attr.mdsthreshold = NULL;
2359         }
2360
2361         nfs4_label_free(olabel);
2362
2363         nfs4_opendata_put(opendata);
2364         nfs4_put_state_owner(sp);
2365         return 0;
2366 err_free_label:
2367         nfs4_label_free(olabel);
2368 err_opendata_put:
2369         nfs4_opendata_put(opendata);
2370 err_put_state_owner:
2371         nfs4_put_state_owner(sp);
2372 out_err:
2373         return status;
2374 }
2375
2376
2377 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2378                                         struct nfs_open_context *ctx,
2379                                         int flags,
2380                                         struct iattr *sattr,
2381                                         struct nfs4_label *label,
2382                                         int *opened)
2383 {
2384         struct nfs_server *server = NFS_SERVER(dir);
2385         struct nfs4_exception exception = { };
2386         struct nfs4_state *res;
2387         int status;
2388
2389         do {
2390                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2391                 res = ctx->state;
2392                 trace_nfs4_open_file(ctx, flags, status);
2393                 if (status == 0)
2394                         break;
2395                 /* NOTE: BAD_SEQID means the server and client disagree about the
2396                  * book-keeping w.r.t. state-changing operations
2397                  * (OPEN/CLOSE/LOCK/LOCKU...)
2398                  * It is actually a sign of a bug on the client or on the server.
2399                  *
2400                  * If we receive a BAD_SEQID error in the particular case of
2401                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2402                  * have unhashed the old state_owner for us, and that we can
2403                  * therefore safely retry using a new one. We should still warn
2404                  * the user though...
2405                  */
2406                 if (status == -NFS4ERR_BAD_SEQID) {
2407                         pr_warn_ratelimited("NFS: v4 server %s "
2408                                         " returned a bad sequence-id error!\n",
2409                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2410                         exception.retry = 1;
2411                         continue;
2412                 }
2413                 /*
2414                  * BAD_STATEID on OPEN means that the server cancelled our
2415                  * state before it received the OPEN_CONFIRM.
2416                  * Recover by retrying the request as per the discussion
2417                  * on Page 181 of RFC3530.
2418                  */
2419                 if (status == -NFS4ERR_BAD_STATEID) {
2420                         exception.retry = 1;
2421                         continue;
2422                 }
2423                 if (status == -EAGAIN) {
2424                         /* We must have found a delegation */
2425                         exception.retry = 1;
2426                         continue;
2427                 }
2428                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2429                         continue;
2430                 res = ERR_PTR(nfs4_handle_exception(server,
2431                                         status, &exception));
2432         } while (exception.retry);
2433         return res;
2434 }
2435
2436 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2437                             struct nfs_fattr *fattr, struct iattr *sattr,
2438                             struct nfs4_state *state, struct nfs4_label *ilabel,
2439                             struct nfs4_label *olabel)
2440 {
2441         struct nfs_server *server = NFS_SERVER(inode);
2442         struct nfs_setattrargs  arg = {
2443                 .fh             = NFS_FH(inode),
2444                 .iap            = sattr,
2445                 .server         = server,
2446                 .bitmask = server->attr_bitmask,
2447                 .label          = ilabel,
2448         };
2449         struct nfs_setattrres  res = {
2450                 .fattr          = fattr,
2451                 .label          = olabel,
2452                 .server         = server,
2453         };
2454         struct rpc_message msg = {
2455                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2456                 .rpc_argp       = &arg,
2457                 .rpc_resp       = &res,
2458                 .rpc_cred       = cred,
2459         };
2460         unsigned long timestamp = jiffies;
2461         fmode_t fmode;
2462         bool truncate;
2463         int status;
2464
2465         arg.bitmask = nfs4_bitmask(server, ilabel);
2466         if (ilabel)
2467                 arg.bitmask = nfs4_bitmask(server, olabel);
2468
2469         nfs_fattr_init(fattr);
2470
2471         /* Servers should only apply open mode checks for file size changes */
2472         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2473         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2474
2475         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2476                 /* Use that stateid */
2477         } else if (truncate && state != NULL) {
2478                 struct nfs_lockowner lockowner = {
2479                         .l_owner = current->files,
2480                         .l_pid = current->tgid,
2481                 };
2482                 if (!nfs4_valid_open_stateid(state))
2483                         return -EBADF;
2484                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2485                                 &lockowner) == -EIO)
2486                         return -EBADF;
2487         } else
2488                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2489
2490         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2491         if (status == 0 && state != NULL)
2492                 renew_lease(server, timestamp);
2493         return status;
2494 }
2495
2496 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2497                            struct nfs_fattr *fattr, struct iattr *sattr,
2498                            struct nfs4_state *state, struct nfs4_label *ilabel,
2499                            struct nfs4_label *olabel)
2500 {
2501         struct nfs_server *server = NFS_SERVER(inode);
2502         struct nfs4_exception exception = {
2503                 .state = state,
2504                 .inode = inode,
2505         };
2506         int err;
2507         do {
2508                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2509                 trace_nfs4_setattr(inode, err);
2510                 switch (err) {
2511                 case -NFS4ERR_OPENMODE:
2512                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2513                                 pr_warn_once("NFSv4: server %s is incorrectly "
2514                                                 "applying open mode checks to "
2515                                                 "a SETATTR that is not "
2516                                                 "changing file size.\n",
2517                                                 server->nfs_client->cl_hostname);
2518                         }
2519                         if (state && !(state->state & FMODE_WRITE)) {
2520                                 err = -EBADF;
2521                                 if (sattr->ia_valid & ATTR_OPEN)
2522                                         err = -EACCES;
2523                                 goto out;
2524                         }
2525                 }
2526                 err = nfs4_handle_exception(server, err, &exception);
2527         } while (exception.retry);
2528 out:
2529         return err;
2530 }
2531
2532 struct nfs4_closedata {
2533         struct inode *inode;
2534         struct nfs4_state *state;
2535         struct nfs_closeargs arg;
2536         struct nfs_closeres res;
2537         struct nfs_fattr fattr;
2538         unsigned long timestamp;
2539         bool roc;
2540         u32 roc_barrier;
2541 };
2542
2543 static void nfs4_free_closedata(void *data)
2544 {
2545         struct nfs4_closedata *calldata = data;
2546         struct nfs4_state_owner *sp = calldata->state->owner;
2547         struct super_block *sb = calldata->state->inode->i_sb;
2548
2549         if (calldata->roc)
2550                 pnfs_roc_release(calldata->state->inode);
2551         nfs4_put_open_state(calldata->state);
2552         nfs_free_seqid(calldata->arg.seqid);
2553         nfs4_put_state_owner(sp);
2554         nfs_sb_deactive(sb);
2555         kfree(calldata);
2556 }
2557
2558 static void nfs4_close_done(struct rpc_task *task, void *data)
2559 {
2560         struct nfs4_closedata *calldata = data;
2561         struct nfs4_state *state = calldata->state;
2562         struct nfs_server *server = NFS_SERVER(calldata->inode);
2563         nfs4_stateid *res_stateid = NULL;
2564
2565         dprintk("%s: begin!\n", __func__);
2566         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2567                 return;
2568         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2569         /* hmm. we are done with the inode, and in the process of freeing
2570          * the state_owner. we keep this around to process errors
2571          */
2572         switch (task->tk_status) {
2573                 case 0:
2574                         res_stateid = &calldata->res.stateid;
2575                         if (calldata->arg.fmode == 0 && calldata->roc)
2576                                 pnfs_roc_set_barrier(state->inode,
2577                                                      calldata->roc_barrier);
2578                         renew_lease(server, calldata->timestamp);
2579                         break;
2580                 case -NFS4ERR_ADMIN_REVOKED:
2581                 case -NFS4ERR_STALE_STATEID:
2582                 case -NFS4ERR_OLD_STATEID:
2583                 case -NFS4ERR_BAD_STATEID:
2584                 case -NFS4ERR_EXPIRED:
2585                         if (calldata->arg.fmode == 0)
2586                                 break;
2587                 default:
2588                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2589                                 rpc_restart_call_prepare(task);
2590                                 goto out_release;
2591                         }
2592         }
2593         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2594 out_release:
2595         nfs_release_seqid(calldata->arg.seqid);
2596         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2597         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2598 }
2599
2600 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2601 {
2602         struct nfs4_closedata *calldata = data;
2603         struct nfs4_state *state = calldata->state;
2604         struct inode *inode = calldata->inode;
2605         bool is_rdonly, is_wronly, is_rdwr;
2606         int call_close = 0;
2607
2608         dprintk("%s: begin!\n", __func__);
2609         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2610                 goto out_wait;
2611
2612         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2613         spin_lock(&state->owner->so_lock);
2614         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2615         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2616         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2617         /* Calculate the change in open mode */
2618         calldata->arg.fmode = 0;
2619         if (state->n_rdwr == 0) {
2620                 if (state->n_rdonly == 0)
2621                         call_close |= is_rdonly;
2622                 else if (is_rdonly)
2623                         calldata->arg.fmode |= FMODE_READ;
2624                 if (state->n_wronly == 0)
2625                         call_close |= is_wronly;
2626                 else if (is_wronly)
2627                         calldata->arg.fmode |= FMODE_WRITE;
2628         } else if (is_rdwr)
2629                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2630
2631         if (calldata->arg.fmode == 0)
2632                 call_close |= is_rdwr;
2633
2634         if (!nfs4_valid_open_stateid(state))
2635                 call_close = 0;
2636         spin_unlock(&state->owner->so_lock);
2637
2638         if (!call_close) {
2639                 /* Note: exit _without_ calling nfs4_close_done */
2640                 goto out_no_action;
2641         }
2642
2643         if (calldata->arg.fmode == 0) {
2644                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2645                 if (calldata->roc &&
2646                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2647                         nfs_release_seqid(calldata->arg.seqid);
2648                         goto out_wait;
2649                     }
2650         }
2651
2652         nfs_fattr_init(calldata->res.fattr);
2653         calldata->timestamp = jiffies;
2654         if (nfs4_setup_sequence(NFS_SERVER(inode),
2655                                 &calldata->arg.seq_args,
2656                                 &calldata->res.seq_res,
2657                                 task) != 0)
2658                 nfs_release_seqid(calldata->arg.seqid);
2659         dprintk("%s: done!\n", __func__);
2660         return;
2661 out_no_action:
2662         task->tk_action = NULL;
2663 out_wait:
2664         nfs4_sequence_done(task, &calldata->res.seq_res);
2665 }
2666
2667 static const struct rpc_call_ops nfs4_close_ops = {
2668         .rpc_call_prepare = nfs4_close_prepare,
2669         .rpc_call_done = nfs4_close_done,
2670         .rpc_release = nfs4_free_closedata,
2671 };
2672
2673 static bool nfs4_state_has_opener(struct nfs4_state *state)
2674 {
2675         /* first check existing openers */
2676         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2677             state->n_rdonly != 0)
2678                 return true;
2679
2680         if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2681             state->n_wronly != 0)
2682                 return true;
2683
2684         if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2685             state->n_rdwr != 0)
2686                 return true;
2687
2688         return false;
2689 }
2690
2691 static bool nfs4_roc(struct inode *inode)
2692 {
2693         struct nfs_inode *nfsi = NFS_I(inode);
2694         struct nfs_open_context *ctx;
2695         struct nfs4_state *state;
2696
2697         spin_lock(&inode->i_lock);
2698         list_for_each_entry(ctx, &nfsi->open_files, list) {
2699                 state = ctx->state;
2700                 if (state == NULL)
2701                         continue;
2702                 if (nfs4_state_has_opener(state)) {
2703                         spin_unlock(&inode->i_lock);
2704                         return false;
2705                 }
2706         }
2707         spin_unlock(&inode->i_lock);
2708
2709         if (nfs4_check_delegation(inode, FMODE_READ))
2710                 return false;
2711
2712         return pnfs_roc(inode);
2713 }
2714
2715 /*
2716  * It is possible for data to be read/written from a mem-mapped file
2717  * after the sys_close call (which hits the vfs layer as a flush).
2718  * This means that we can't safely call nfsv4 close on a file until
2719  * the inode is cleared. This in turn means that we are not good
2720  * NFSv4 citizens - we do not indicate to the server to update the file's
2721  * share state even when we are done with one of the three share
2722  * stateid's in the inode.
2723  *
2724  * NOTE: Caller must be holding the sp->so_owner semaphore!
2725  */
2726 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2727 {
2728         struct nfs_server *server = NFS_SERVER(state->inode);
2729         struct nfs4_closedata *calldata;
2730         struct nfs4_state_owner *sp = state->owner;
2731         struct rpc_task *task;
2732         struct rpc_message msg = {
2733                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2734                 .rpc_cred = state->owner->so_cred,
2735         };
2736         struct rpc_task_setup task_setup_data = {
2737                 .rpc_client = server->client,
2738                 .rpc_message = &msg,
2739                 .callback_ops = &nfs4_close_ops,
2740                 .workqueue = nfsiod_workqueue,
2741                 .flags = RPC_TASK_ASYNC,
2742         };
2743         int status = -ENOMEM;
2744
2745         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2746                 &task_setup_data.rpc_client, &msg);
2747
2748         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2749         if (calldata == NULL)
2750                 goto out;
2751         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2752         calldata->inode = state->inode;
2753         calldata->state = state;
2754         calldata->arg.fh = NFS_FH(state->inode);
2755         calldata->arg.stateid = &state->open_stateid;
2756         /* Serialization for the sequence id */
2757         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2758         if (calldata->arg.seqid == NULL)
2759                 goto out_free_calldata;
2760         calldata->arg.fmode = 0;
2761         calldata->arg.bitmask = server->cache_consistency_bitmask;
2762         calldata->res.fattr = &calldata->fattr;
2763         calldata->res.seqid = calldata->arg.seqid;
2764         calldata->res.server = server;
2765         calldata->roc = nfs4_roc(state->inode);
2766         nfs_sb_active(calldata->inode->i_sb);
2767
2768         msg.rpc_argp = &calldata->arg;
2769         msg.rpc_resp = &calldata->res;
2770         task_setup_data.callback_data = calldata;
2771         task = rpc_run_task(&task_setup_data);
2772         if (IS_ERR(task))
2773                 return PTR_ERR(task);
2774         status = 0;
2775         if (wait)
2776                 status = rpc_wait_for_completion_task(task);
2777         rpc_put_task(task);
2778         return status;
2779 out_free_calldata:
2780         kfree(calldata);
2781 out:
2782         nfs4_put_open_state(state);
2783         nfs4_put_state_owner(sp);
2784         return status;
2785 }
2786
2787 static struct inode *
2788 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2789                 int open_flags, struct iattr *attr, int *opened)
2790 {
2791         struct nfs4_state *state;
2792         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2793
2794         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2795
2796         /* Protect against concurrent sillydeletes */
2797         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2798
2799         nfs4_label_release_security(label);
2800
2801         if (IS_ERR(state))
2802                 return ERR_CAST(state);
2803         return state->inode;
2804 }
2805
2806 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2807 {
2808         if (ctx->state == NULL)
2809                 return;
2810         if (is_sync)
2811                 nfs4_close_sync(ctx->state, ctx->mode);
2812         else
2813                 nfs4_close_state(ctx->state, ctx->mode);
2814 }
2815
2816 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2817 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2818 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2819
2820 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2821 {
2822         struct nfs4_server_caps_arg args = {
2823                 .fhandle = fhandle,
2824         };
2825         struct nfs4_server_caps_res res = {};
2826         struct rpc_message msg = {
2827                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2828                 .rpc_argp = &args,
2829                 .rpc_resp = &res,
2830         };
2831         int status;
2832
2833         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2834         if (status == 0) {
2835                 /* Sanity check the server answers */
2836                 switch (server->nfs_client->cl_minorversion) {
2837                 case 0:
2838                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2839                         res.attr_bitmask[2] = 0;
2840                         break;
2841                 case 1:
2842                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2843                         break;
2844                 case 2:
2845                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2846                 }
2847                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2848                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2849                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2850                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2851                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2852                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2853                                 NFS_CAP_SECURITY_LABEL);
2854                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2855                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2856                         server->caps |= NFS_CAP_ACLS;
2857                 if (res.has_links != 0)
2858                         server->caps |= NFS_CAP_HARDLINKS;
2859                 if (res.has_symlinks != 0)
2860                         server->caps |= NFS_CAP_SYMLINKS;
2861                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2862                         server->caps |= NFS_CAP_FILEID;
2863                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2864                         server->caps |= NFS_CAP_MODE;
2865                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2866                         server->caps |= NFS_CAP_NLINK;
2867                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2868                         server->caps |= NFS_CAP_OWNER;
2869                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2870                         server->caps |= NFS_CAP_OWNER_GROUP;
2871                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2872                         server->caps |= NFS_CAP_ATIME;
2873                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2874                         server->caps |= NFS_CAP_CTIME;
2875                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2876                         server->caps |= NFS_CAP_MTIME;
2877 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2878                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2879                         server->caps |= NFS_CAP_SECURITY_LABEL;
2880 #endif
2881                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2882                                 sizeof(server->attr_bitmask));
2883                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2884
2885                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2886                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2887                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2888                 server->cache_consistency_bitmask[2] = 0;
2889                 server->acl_bitmask = res.acl_bitmask;
2890                 server->fh_expire_type = res.fh_expire_type;
2891         }
2892
2893         return status;
2894 }
2895
2896 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2897 {
2898         struct nfs4_exception exception = { };
2899         int err;
2900         do {
2901                 err = nfs4_handle_exception(server,
2902                                 _nfs4_server_capabilities(server, fhandle),
2903                                 &exception);
2904         } while (exception.retry);
2905         return err;
2906 }
2907
2908 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2909                 struct nfs_fsinfo *info)
2910 {
2911         u32 bitmask[3];
2912         struct nfs4_lookup_root_arg args = {
2913                 .bitmask = bitmask,
2914         };
2915         struct nfs4_lookup_res res = {
2916                 .server = server,
2917                 .fattr = info->fattr,
2918                 .fh = fhandle,
2919         };
2920         struct rpc_message msg = {
2921                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2922                 .rpc_argp = &args,
2923                 .rpc_resp = &res,
2924         };
2925
2926         bitmask[0] = nfs4_fattr_bitmap[0];
2927         bitmask[1] = nfs4_fattr_bitmap[1];
2928         /*
2929          * Process the label in the upcoming getfattr
2930          */
2931         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2932
2933         nfs_fattr_init(info->fattr);
2934         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2935 }
2936
2937 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2938                 struct nfs_fsinfo *info)
2939 {
2940         struct nfs4_exception exception = { };
2941         int err;
2942         do {
2943                 err = _nfs4_lookup_root(server, fhandle, info);
2944                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2945                 switch (err) {
2946                 case 0:
2947                 case -NFS4ERR_WRONGSEC:
2948                         goto out;
2949                 default:
2950                         err = nfs4_handle_exception(server, err, &exception);
2951                 }
2952         } while (exception.retry);
2953 out:
2954         return err;
2955 }
2956
2957 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2958                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2959 {
2960         struct rpc_auth_create_args auth_args = {
2961                 .pseudoflavor = flavor,
2962         };
2963         struct rpc_auth *auth;
2964         int ret;
2965
2966         auth = rpcauth_create(&auth_args, server->client);
2967         if (IS_ERR(auth)) {
2968                 ret = -EACCES;
2969                 goto out;
2970         }
2971         ret = nfs4_lookup_root(server, fhandle, info);
2972 out:
2973         return ret;
2974 }
2975
2976 /*
2977  * Retry pseudoroot lookup with various security flavors.  We do this when:
2978  *
2979  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2980  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2981  *
2982  * Returns zero on success, or a negative NFS4ERR value, or a
2983  * negative errno value.
2984  */
2985 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2986                               struct nfs_fsinfo *info)
2987 {
2988         /* Per 3530bis 15.33.5 */
2989         static const rpc_authflavor_t flav_array[] = {
2990                 RPC_AUTH_GSS_KRB5P,
2991                 RPC_AUTH_GSS_KRB5I,
2992                 RPC_AUTH_GSS_KRB5,
2993                 RPC_AUTH_UNIX,                  /* courtesy */
2994                 RPC_AUTH_NULL,
2995         };
2996         int status = -EPERM;
2997         size_t i;
2998
2999         if (server->auth_info.flavor_len > 0) {
3000                 /* try each flavor specified by user */
3001                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3002                         status = nfs4_lookup_root_sec(server, fhandle, info,
3003                                                 server->auth_info.flavors[i]);
3004                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3005                                 continue;
3006                         break;
3007                 }
3008         } else {
3009                 /* no flavors specified by user, try default list */
3010                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3011                         status = nfs4_lookup_root_sec(server, fhandle, info,
3012                                                       flav_array[i]);
3013                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3014                                 continue;
3015                         break;
3016                 }
3017         }
3018
3019         /*
3020          * -EACCESS could mean that the user doesn't have correct permissions
3021          * to access the mount.  It could also mean that we tried to mount
3022          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3023          * existing mount programs don't handle -EACCES very well so it should
3024          * be mapped to -EPERM instead.
3025          */
3026         if (status == -EACCES)
3027                 status = -EPERM;
3028         return status;
3029 }
3030
3031 static int nfs4_do_find_root_sec(struct nfs_server *server,
3032                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3033 {
3034         int mv = server->nfs_client->cl_minorversion;
3035         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3036 }
3037
3038 /**
3039  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3040  * @server: initialized nfs_server handle
3041  * @fhandle: we fill in the pseudo-fs root file handle
3042  * @info: we fill in an FSINFO struct
3043  * @auth_probe: probe the auth flavours
3044  *
3045  * Returns zero on success, or a negative errno.
3046  */
3047 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3048                          struct nfs_fsinfo *info,
3049                          bool auth_probe)
3050 {
3051         int status;
3052
3053         switch (auth_probe) {
3054         case false:
3055                 status = nfs4_lookup_root(server, fhandle, info);
3056                 if (status != -NFS4ERR_WRONGSEC)
3057                         break;
3058         default:
3059                 status = nfs4_do_find_root_sec(server, fhandle, info);
3060         }
3061
3062         if (status == 0)
3063                 status = nfs4_server_capabilities(server, fhandle);
3064         if (status == 0)
3065                 status = nfs4_do_fsinfo(server, fhandle, info);
3066
3067         return nfs4_map_errors(status);
3068 }
3069
3070 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3071                               struct nfs_fsinfo *info)
3072 {
3073         int error;
3074         struct nfs_fattr *fattr = info->fattr;
3075         struct nfs4_label *label = NULL;
3076
3077         error = nfs4_server_capabilities(server, mntfh);
3078         if (error < 0) {
3079                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3080                 return error;
3081         }
3082
3083         label = nfs4_label_alloc(server, GFP_KERNEL);
3084         if (IS_ERR(label))
3085                 return PTR_ERR(label);
3086
3087         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3088         if (error < 0) {
3089                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3090                 goto err_free_label;
3091         }
3092
3093         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3094             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3095                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3096
3097 err_free_label:
3098         nfs4_label_free(label);
3099
3100         return error;
3101 }
3102
3103 /*
3104  * Get locations and (maybe) other attributes of a referral.
3105  * Note that we'll actually follow the referral later when
3106  * we detect fsid mismatch in inode revalidation
3107  */
3108 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3109                              const struct qstr *name, struct nfs_fattr *fattr,
3110                              struct nfs_fh *fhandle)
3111 {
3112         int status = -ENOMEM;
3113         struct page *page = NULL;
3114         struct nfs4_fs_locations *locations = NULL;
3115
3116         page = alloc_page(GFP_KERNEL);
3117         if (page == NULL)
3118                 goto out;
3119         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3120         if (locations == NULL)
3121                 goto out;
3122
3123         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3124         if (status != 0)
3125                 goto out;
3126
3127         /*
3128          * If the fsid didn't change, this is a migration event, not a
3129          * referral.  Cause us to drop into the exception handler, which
3130          * will kick off migration recovery.
3131          */
3132         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3133                 dprintk("%s: server did not return a different fsid for"
3134                         " a referral at %s\n", __func__, name->name);
3135                 status = -NFS4ERR_MOVED;
3136                 goto out;
3137         }
3138         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3139         nfs_fixup_referral_attributes(&locations->fattr);
3140
3141         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3142         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3143         memset(fhandle, 0, sizeof(struct nfs_fh));
3144 out:
3145         if (page)
3146                 __free_page(page);
3147         kfree(locations);
3148         return status;
3149 }
3150
3151 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3152                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3153 {
3154         struct nfs4_getattr_arg args = {
3155                 .fh = fhandle,
3156                 .bitmask = server->attr_bitmask,
3157         };
3158         struct nfs4_getattr_res res = {
3159                 .fattr = fattr,
3160                 .label = label,
3161                 .server = server,
3162         };
3163         struct rpc_message msg = {
3164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3165                 .rpc_argp = &args,
3166                 .rpc_resp = &res,
3167         };
3168
3169         args.bitmask = nfs4_bitmask(server, label);
3170
3171         nfs_fattr_init(fattr);
3172         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3173 }
3174
3175 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3176                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3177 {
3178         struct nfs4_exception exception = { };
3179         int err;
3180         do {
3181                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3182                 trace_nfs4_getattr(server, fhandle, fattr, err);
3183                 err = nfs4_handle_exception(server, err,
3184                                 &exception);
3185         } while (exception.retry);
3186         return err;
3187 }
3188
3189 /*
3190  * The file is not closed if it is opened due to the a request to change
3191  * the size of the file. The open call will not be needed once the
3192  * VFS layer lookup-intents are implemented.
3193  *
3194  * Close is called when the inode is destroyed.
3195  * If we haven't opened the file for O_WRONLY, we
3196  * need to in the size_change case to obtain a stateid.
3197  *
3198  * Got race?
3199  * Because OPEN is always done by name in nfsv4, it is
3200  * possible that we opened a different file by the same
3201  * name.  We can recognize this race condition, but we
3202  * can't do anything about it besides returning an error.
3203  *
3204  * This will be fixed with VFS changes (lookup-intent).
3205  */
3206 static int
3207 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3208                   struct iattr *sattr)
3209 {
3210         struct inode *inode = dentry->d_inode;
3211         struct rpc_cred *cred = NULL;
3212         struct nfs4_state *state = NULL;
3213         struct nfs4_label *label = NULL;
3214         int status;
3215
3216         if (pnfs_ld_layoutret_on_setattr(inode) &&
3217             sattr->ia_valid & ATTR_SIZE &&
3218             sattr->ia_size < i_size_read(inode))
3219                 pnfs_commit_and_return_layout(inode);
3220
3221         nfs_fattr_init(fattr);
3222
3223         /* Deal with open(O_TRUNC) */
3224         if (sattr->ia_valid & ATTR_OPEN)
3225                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3226
3227         /* Optimization: if the end result is no change, don't RPC */
3228         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3229                 return 0;
3230
3231         /* Search for an existing open(O_WRITE) file */
3232         if (sattr->ia_valid & ATTR_FILE) {
3233                 struct nfs_open_context *ctx;
3234
3235                 ctx = nfs_file_open_context(sattr->ia_file);
3236                 if (ctx) {
3237                         cred = ctx->cred;
3238                         state = ctx->state;
3239                 }
3240         }
3241
3242         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3243         if (IS_ERR(label))
3244                 return PTR_ERR(label);
3245
3246         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3247         if (status == 0) {
3248                 nfs_setattr_update_inode(inode, sattr);
3249                 nfs_setsecurity(inode, fattr, label);
3250         }
3251         nfs4_label_free(label);
3252         return status;
3253 }
3254
3255 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3256                 const struct qstr *name, struct nfs_fh *fhandle,
3257                 struct nfs_fattr *fattr, struct nfs4_label *label)
3258 {
3259         struct nfs_server *server = NFS_SERVER(dir);
3260         int                    status;
3261         struct nfs4_lookup_arg args = {
3262                 .bitmask = server->attr_bitmask,
3263                 .dir_fh = NFS_FH(dir),
3264                 .name = name,
3265         };
3266         struct nfs4_lookup_res res = {
3267                 .server = server,
3268                 .fattr = fattr,
3269                 .label = label,
3270                 .fh = fhandle,
3271         };
3272         struct rpc_message msg = {
3273                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3274                 .rpc_argp = &args,
3275                 .rpc_resp = &res,
3276         };
3277
3278         args.bitmask = nfs4_bitmask(server, label);
3279
3280         nfs_fattr_init(fattr);
3281
3282         dprintk("NFS call  lookup %s\n", name->name);
3283         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3284         dprintk("NFS reply lookup: %d\n", status);
3285         return status;
3286 }
3287
3288 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3289 {
3290         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3291                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3292         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3293         fattr->nlink = 2;
3294 }
3295
3296 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3297                                    struct qstr *name, struct nfs_fh *fhandle,
3298                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3299 {
3300         struct nfs4_exception exception = { };
3301         struct rpc_clnt *client = *clnt;
3302         int err;
3303         do {
3304                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3305                 trace_nfs4_lookup(dir, name, err);
3306                 switch (err) {
3307                 case -NFS4ERR_BADNAME:
3308                         err = -ENOENT;
3309                         goto out;
3310                 case -NFS4ERR_MOVED:
3311                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3312                         goto out;
3313                 case -NFS4ERR_WRONGSEC:
3314                         err = -EPERM;
3315                         if (client != *clnt)
3316                                 goto out;
3317                         client = nfs4_negotiate_security(client, dir, name);
3318                         if (IS_ERR(client))
3319                                 return PTR_ERR(client);
3320
3321                         exception.retry = 1;
3322                         break;
3323                 default:
3324                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3325                 }
3326         } while (exception.retry);
3327
3328 out:
3329         if (err == 0)
3330                 *clnt = client;
3331         else if (client != *clnt)
3332                 rpc_shutdown_client(client);
3333
3334         return err;
3335 }
3336
3337 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3338                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3339                             struct nfs4_label *label)
3340 {
3341         int status;
3342         struct rpc_clnt *client = NFS_CLIENT(dir);
3343
3344         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3345         if (client != NFS_CLIENT(dir)) {
3346                 rpc_shutdown_client(client);
3347                 nfs_fixup_secinfo_attributes(fattr);
3348         }
3349         return status;
3350 }
3351
3352 struct rpc_clnt *
3353 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3354                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3355 {
3356         struct rpc_clnt *client = NFS_CLIENT(dir);
3357         int status;
3358
3359         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3360         if (status < 0)
3361                 return ERR_PTR(status);
3362         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3363 }
3364
3365 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3366 {
3367         struct nfs_server *server = NFS_SERVER(inode);
3368         struct nfs4_accessargs args = {
3369                 .fh = NFS_FH(inode),
3370                 .bitmask = server->cache_consistency_bitmask,
3371         };
3372         struct nfs4_accessres res = {
3373                 .server = server,
3374         };
3375         struct rpc_message msg = {
3376                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3377                 .rpc_argp = &args,
3378                 .rpc_resp = &res,
3379                 .rpc_cred = entry->cred,
3380         };
3381         int mode = entry->mask;
3382         int status = 0;
3383
3384         /*
3385          * Determine which access bits we want to ask for...
3386          */
3387         if (mode & MAY_READ)
3388                 args.access |= NFS4_ACCESS_READ;
3389         if (S_ISDIR(inode->i_mode)) {
3390                 if (mode & MAY_WRITE)
3391                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3392                 if (mode & MAY_EXEC)
3393                         args.access |= NFS4_ACCESS_LOOKUP;
3394         } else {
3395                 if (mode & MAY_WRITE)
3396                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3397                 if (mode & MAY_EXEC)
3398                         args.access |= NFS4_ACCESS_EXECUTE;
3399         }
3400
3401         res.fattr = nfs_alloc_fattr();
3402         if (res.fattr == NULL)
3403                 return -ENOMEM;
3404
3405         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3406         if (!status) {
3407                 nfs_access_set_mask(entry, res.access);
3408                 nfs_refresh_inode(inode, res.fattr);
3409         }
3410         nfs_free_fattr(res.fattr);
3411         return status;
3412 }
3413
3414 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3415 {
3416         struct nfs4_exception exception = { };
3417         int err;
3418         do {
3419                 err = _nfs4_proc_access(inode, entry);
3420                 trace_nfs4_access(inode, err);
3421                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3422                                 &exception);
3423         } while (exception.retry);
3424         return err;
3425 }
3426
3427 /*
3428  * TODO: For the time being, we don't try to get any attributes
3429  * along with any of the zero-copy operations READ, READDIR,
3430  * READLINK, WRITE.
3431  *
3432  * In the case of the first three, we want to put the GETATTR
3433  * after the read-type operation -- this is because it is hard
3434  * to predict the length of a GETATTR response in v4, and thus
3435  * align the READ data correctly.  This means that the GETATTR
3436  * may end up partially falling into the page cache, and we should
3437  * shift it into the 'tail' of the xdr_buf before processing.
3438  * To do this efficiently, we need to know the total length
3439  * of data received, which doesn't seem to be available outside
3440  * of the RPC layer.
3441  *
3442  * In the case of WRITE, we also want to put the GETATTR after
3443  * the operation -- in this case because we want to make sure
3444  * we get the post-operation mtime and size.
3445  *
3446  * Both of these changes to the XDR layer would in fact be quite
3447  * minor, but I decided to leave them for a subsequent patch.
3448  */
3449 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3450                 unsigned int pgbase, unsigned int pglen)
3451 {
3452         struct nfs4_readlink args = {
3453                 .fh       = NFS_FH(inode),
3454                 .pgbase   = pgbase,
3455                 .pglen    = pglen,
3456                 .pages    = &page,
3457         };
3458         struct nfs4_readlink_res res;
3459         struct rpc_message msg = {
3460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3461                 .rpc_argp = &args,
3462                 .rpc_resp = &res,
3463         };
3464
3465         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3466 }
3467
3468 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3469                 unsigned int pgbase, unsigned int pglen)
3470 {
3471         struct nfs4_exception exception = { };
3472         int err;
3473         do {
3474                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3475                 trace_nfs4_readlink(inode, err);
3476                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3477                                 &exception);
3478         } while (exception.retry);
3479         return err;
3480 }
3481
3482 /*
3483  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3484  */
3485 static int
3486 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3487                  int flags)
3488 {
3489         struct nfs4_label l, *ilabel = NULL;
3490         struct nfs_open_context *ctx;
3491         struct nfs4_state *state;
3492         int opened = 0;
3493         int status = 0;
3494
3495         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3496         if (IS_ERR(ctx))
3497                 return PTR_ERR(ctx);
3498
3499         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3500
3501         sattr->ia_mode &= ~current_umask();
3502         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3503         if (IS_ERR(state)) {
3504                 status = PTR_ERR(state);
3505                 goto out;
3506         }
3507 out:
3508         nfs4_label_release_security(ilabel);
3509         put_nfs_open_context(ctx);
3510         return status;
3511 }
3512
3513 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3514 {
3515         struct nfs_server *server = NFS_SERVER(dir);
3516         struct nfs_removeargs args = {
3517                 .fh = NFS_FH(dir),
3518                 .name = *name,
3519         };
3520         struct nfs_removeres res = {
3521                 .server = server,
3522         };
3523         struct rpc_message msg = {
3524                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3525                 .rpc_argp = &args,
3526                 .rpc_resp = &res,
3527         };
3528         int status;
3529
3530         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3531         if (status == 0)
3532                 update_changeattr(dir, &res.cinfo);
3533         return status;
3534 }
3535
3536 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3537 {
3538         struct nfs4_exception exception = { };
3539         int err;
3540         do {
3541                 err = _nfs4_proc_remove(dir, name);
3542                 trace_nfs4_remove(dir, name, err);
3543                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3544                                 &exception);
3545         } while (exception.retry);
3546         return err;
3547 }
3548
3549 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3550 {
3551         struct nfs_server *server = NFS_SERVER(dir);
3552         struct nfs_removeargs *args = msg->rpc_argp;
3553         struct nfs_removeres *res = msg->rpc_resp;
3554
3555         res->server = server;
3556         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3557         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3558
3559         nfs_fattr_init(res->dir_attr);
3560 }
3561
3562 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3563 {
3564         nfs4_setup_sequence(NFS_SERVER(data->dir),
3565                         &data->args.seq_args,
3566                         &data->res.seq_res,
3567                         task);
3568 }
3569
3570 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3571 {
3572         struct nfs_unlinkdata *data = task->tk_calldata;
3573         struct nfs_removeres *res = &data->res;
3574
3575         if (!nfs4_sequence_done(task, &res->seq_res))
3576                 return 0;
3577         if (nfs4_async_handle_error(task, res->server, NULL,
3578                                     &data->timeout) == -EAGAIN)
3579                 return 0;
3580         update_changeattr(dir, &res->cinfo);
3581         return 1;
3582 }
3583
3584 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3585 {
3586         struct nfs_server *server = NFS_SERVER(dir);
3587         struct nfs_renameargs *arg = msg->rpc_argp;
3588         struct nfs_renameres *res = msg->rpc_resp;
3589
3590         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3591         res->server = server;
3592         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3593 }
3594
3595 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3596 {
3597         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3598                         &data->args.seq_args,
3599                         &data->res.seq_res,
3600                         task);
3601 }
3602
3603 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3604                                  struct inode *new_dir)
3605 {
3606         struct nfs_renamedata *data = task->tk_calldata;
3607         struct nfs_renameres *res = &data->res;
3608
3609         if (!nfs4_sequence_done(task, &res->seq_res))
3610                 return 0;
3611         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3612                 return 0;
3613
3614         update_changeattr(old_dir, &res->old_cinfo);
3615         update_changeattr(new_dir, &res->new_cinfo);
3616         return 1;
3617 }
3618
3619 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3620 {
3621         struct nfs_server *server = NFS_SERVER(inode);
3622         struct nfs4_link_arg arg = {
3623                 .fh     = NFS_FH(inode),
3624                 .dir_fh = NFS_FH(dir),
3625                 .name   = name,
3626                 .bitmask = server->attr_bitmask,
3627         };
3628         struct nfs4_link_res res = {
3629                 .server = server,
3630                 .label = NULL,
3631         };
3632         struct rpc_message msg = {
3633                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3634                 .rpc_argp = &arg,
3635                 .rpc_resp = &res,
3636         };
3637         int status = -ENOMEM;
3638
3639         res.fattr = nfs_alloc_fattr();
3640         if (res.fattr == NULL)
3641                 goto out;
3642
3643         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3644         if (IS_ERR(res.label)) {
3645                 status = PTR_ERR(res.label);
3646                 goto out;
3647         }
3648         arg.bitmask = nfs4_bitmask(server, res.label);
3649
3650         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3651         if (!status) {
3652                 update_changeattr(dir, &res.cinfo);
3653                 status = nfs_post_op_update_inode(inode, res.fattr);
3654                 if (!status)
3655                         nfs_setsecurity(inode, res.fattr, res.label);
3656         }
3657
3658
3659         nfs4_label_free(res.label);
3660
3661 out:
3662         nfs_free_fattr(res.fattr);
3663         return status;
3664 }
3665
3666 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3667 {
3668         struct nfs4_exception exception = { };
3669         int err;
3670         do {
3671                 err = nfs4_handle_exception(NFS_SERVER(inode),
3672                                 _nfs4_proc_link(inode, dir, name),
3673                                 &exception);
3674         } while (exception.retry);
3675         return err;
3676 }
3677
3678 struct nfs4_createdata {
3679         struct rpc_message msg;
3680         struct nfs4_create_arg arg;
3681         struct nfs4_create_res res;
3682         struct nfs_fh fh;
3683         struct nfs_fattr fattr;
3684         struct nfs4_label *label;
3685 };
3686
3687 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3688                 struct qstr *name, struct iattr *sattr, u32 ftype)
3689 {
3690         struct nfs4_createdata *data;
3691
3692         data = kzalloc(sizeof(*data), GFP_KERNEL);
3693         if (data != NULL) {
3694                 struct nfs_server *server = NFS_SERVER(dir);
3695
3696                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3697                 if (IS_ERR(data->label))
3698                         goto out_free;
3699
3700                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3701                 data->msg.rpc_argp = &data->arg;
3702                 data->msg.rpc_resp = &data->res;
3703                 data->arg.dir_fh = NFS_FH(dir);
3704                 data->arg.server = server;
3705                 data->arg.name = name;
3706                 data->arg.attrs = sattr;
3707                 data->arg.ftype = ftype;
3708                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3709                 data->res.server = server;
3710                 data->res.fh = &data->fh;
3711                 data->res.fattr = &data->fattr;
3712                 data->res.label = data->label;
3713                 nfs_fattr_init(data->res.fattr);
3714         }
3715         return data;
3716 out_free:
3717         kfree(data);
3718         return NULL;
3719 }
3720
3721 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3722 {
3723         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3724                                     &data->arg.seq_args, &data->res.seq_res, 1);
3725         if (status == 0) {
3726                 update_changeattr(dir, &data->res.dir_cinfo);
3727                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3728         }
3729         return status;
3730 }
3731
3732 static void nfs4_free_createdata(struct nfs4_createdata *data)
3733 {
3734         nfs4_label_free(data->label);
3735         kfree(data);
3736 }
3737
3738 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3739                 struct page *page, unsigned int len, struct iattr *sattr,
3740                 struct nfs4_label *label)
3741 {
3742         struct nfs4_createdata *data;
3743         int status = -ENAMETOOLONG;
3744
3745         if (len > NFS4_MAXPATHLEN)
3746                 goto out;
3747
3748         status = -ENOMEM;
3749         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3750         if (data == NULL)
3751                 goto out;
3752
3753         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3754         data->arg.u.symlink.pages = &page;
3755         data->arg.u.symlink.len = len;
3756         data->arg.label = label;
3757
3758         status = nfs4_do_create(dir, dentry, data);
3759
3760         nfs4_free_createdata(data);
3761 out:
3762         return status;
3763 }
3764
3765 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3766                 struct page *page, unsigned int len, struct iattr *sattr)
3767 {
3768         struct nfs4_exception exception = { };
3769         struct nfs4_label l, *label = NULL;
3770         int err;
3771
3772         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3773
3774         do {
3775                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3776                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3777                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3778                                 &exception);
3779         } while (exception.retry);
3780
3781         nfs4_label_release_security(label);
3782         return err;
3783 }
3784
3785 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3786                 struct iattr *sattr, struct nfs4_label *label)
3787 {
3788         struct nfs4_createdata *data;
3789         int status = -ENOMEM;
3790
3791         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3792         if (data == NULL)
3793                 goto out;
3794
3795         data->arg.label = label;
3796         status = nfs4_do_create(dir, dentry, data);
3797
3798         nfs4_free_createdata(data);
3799 out:
3800         return status;
3801 }
3802
3803 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3804                 struct iattr *sattr)
3805 {
3806         struct nfs4_exception exception = { };
3807         struct nfs4_label l, *label = NULL;
3808         int err;
3809
3810         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3811
3812         sattr->ia_mode &= ~current_umask();
3813         do {
3814                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3815                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3816                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3817                                 &exception);
3818         } while (exception.retry);
3819         nfs4_label_release_security(label);
3820
3821         return err;
3822 }
3823
3824 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3825                 u64 cookie, struct page **pages, unsigned int count, int plus)
3826 {
3827         struct inode            *dir = dentry->d_inode;
3828         struct nfs4_readdir_arg args = {
3829                 .fh = NFS_FH(dir),
3830                 .pages = pages,
3831                 .pgbase = 0,
3832                 .count = count,
3833                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3834                 .plus = plus,
3835         };
3836         struct nfs4_readdir_res res;
3837         struct rpc_message msg = {
3838                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3839                 .rpc_argp = &args,
3840                 .rpc_resp = &res,
3841                 .rpc_cred = cred,
3842         };
3843         int                     status;
3844
3845         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3846                         dentry,
3847                         (unsigned long long)cookie);
3848         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3849         res.pgbase = args.pgbase;
3850         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3851         if (status >= 0) {
3852                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3853                 status += args.pgbase;
3854         }
3855
3856         nfs_invalidate_atime(dir);
3857
3858         dprintk("%s: returns %d\n", __func__, status);
3859         return status;
3860 }
3861
3862 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3863                 u64 cookie, struct page **pages, unsigned int count, int plus)
3864 {
3865         struct nfs4_exception exception = { };
3866         int err;
3867         do {
3868                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3869                                 pages, count, plus);
3870                 trace_nfs4_readdir(dentry->d_inode, err);
3871                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3872                                 &exception);
3873         } while (exception.retry);
3874         return err;
3875 }
3876
3877 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3878                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3879 {
3880         struct nfs4_createdata *data;
3881         int mode = sattr->ia_mode;
3882         int status = -ENOMEM;
3883
3884         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3885         if (data == NULL)
3886                 goto out;
3887
3888         if (S_ISFIFO(mode))
3889                 data->arg.ftype = NF4FIFO;
3890         else if (S_ISBLK(mode)) {
3891                 data->arg.ftype = NF4BLK;
3892                 data->arg.u.device.specdata1 = MAJOR(rdev);
3893                 data->arg.u.device.specdata2 = MINOR(rdev);
3894         }
3895         else if (S_ISCHR(mode)) {
3896                 data->arg.ftype = NF4CHR;
3897                 data->arg.u.device.specdata1 = MAJOR(rdev);
3898                 data->arg.u.device.specdata2 = MINOR(rdev);
3899         } else if (!S_ISSOCK(mode)) {
3900                 status = -EINVAL;
3901                 goto out_free;
3902         }
3903
3904         data->arg.label = label;
3905         status = nfs4_do_create(dir, dentry, data);
3906 out_free:
3907         nfs4_free_createdata(data);
3908 out:
3909         return status;
3910 }
3911
3912 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3913                 struct iattr *sattr, dev_t rdev)
3914 {
3915         struct nfs4_exception exception = { };
3916         struct nfs4_label l, *label = NULL;
3917         int err;
3918
3919         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3920
3921         sattr->ia_mode &= ~current_umask();
3922         do {
3923                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3924                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3925                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3926                                 &exception);
3927         } while (exception.retry);
3928
3929         nfs4_label_release_security(label);
3930
3931         return err;
3932 }
3933
3934 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3935                  struct nfs_fsstat *fsstat)
3936 {
3937         struct nfs4_statfs_arg args = {
3938                 .fh = fhandle,
3939                 .bitmask = server->attr_bitmask,
3940         };
3941         struct nfs4_statfs_res res = {
3942                 .fsstat = fsstat,
3943         };
3944         struct rpc_message msg = {
3945                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3946                 .rpc_argp = &args,
3947                 .rpc_resp = &res,
3948         };
3949
3950         nfs_fattr_init(fsstat->fattr);
3951         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3952 }
3953
3954 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3955 {
3956         struct nfs4_exception exception = { };
3957         int err;
3958         do {
3959                 err = nfs4_handle_exception(server,
3960                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3961                                 &exception);
3962         } while (exception.retry);
3963         return err;
3964 }
3965
3966 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3967                 struct nfs_fsinfo *fsinfo)
3968 {
3969         struct nfs4_fsinfo_arg args = {
3970                 .fh = fhandle,
3971                 .bitmask = server->attr_bitmask,
3972         };
3973         struct nfs4_fsinfo_res res = {
3974                 .fsinfo = fsinfo,
3975         };
3976         struct rpc_message msg = {
3977                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3978                 .rpc_argp = &args,
3979                 .rpc_resp = &res,
3980         };
3981
3982         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3983 }
3984
3985 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3986 {
3987         struct nfs4_exception exception = { };
3988         unsigned long now = jiffies;
3989         int err;
3990
3991         do {
3992                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3993                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3994                 if (err == 0) {
3995                         struct nfs_client *clp = server->nfs_client;
3996
3997                         spin_lock(&clp->cl_lock);
3998                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3999                         clp->cl_last_renewal = now;
4000                         spin_unlock(&clp->cl_lock);
4001                         break;
4002                 }
4003                 err = nfs4_handle_exception(server, err, &exception);
4004         } while (exception.retry);
4005         return err;
4006 }
4007
4008 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4009 {
4010         int error;
4011
4012         nfs_fattr_init(fsinfo->fattr);
4013         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4014         if (error == 0) {
4015                 /* block layout checks this! */
4016                 server->pnfs_blksize = fsinfo->blksize;
4017                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4018         }
4019
4020         return error;
4021 }
4022
4023 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4024                 struct nfs_pathconf *pathconf)
4025 {
4026         struct nfs4_pathconf_arg args = {
4027                 .fh = fhandle,
4028                 .bitmask = server->attr_bitmask,
4029         };
4030         struct nfs4_pathconf_res res = {
4031                 .pathconf = pathconf,
4032         };
4033         struct rpc_message msg = {
4034                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4035                 .rpc_argp = &args,
4036                 .rpc_resp = &res,
4037         };
4038
4039         /* None of the pathconf attributes are mandatory to implement */
4040         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4041                 memset(pathconf, 0, sizeof(*pathconf));
4042                 return 0;
4043         }
4044
4045         nfs_fattr_init(pathconf->fattr);
4046         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4047 }
4048
4049 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4050                 struct nfs_pathconf *pathconf)
4051 {
4052         struct nfs4_exception exception = { };
4053         int err;
4054
4055         do {
4056                 err = nfs4_handle_exception(server,
4057                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4058                                 &exception);
4059         } while (exception.retry);
4060         return err;
4061 }
4062
4063 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4064                 const struct nfs_open_context *ctx,
4065                 const struct nfs_lock_context *l_ctx,
4066                 fmode_t fmode)
4067 {
4068         const struct nfs_lockowner *lockowner = NULL;
4069
4070         if (l_ctx != NULL)
4071                 lockowner = &l_ctx->lockowner;
4072         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4073 }
4074 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4075
4076 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4077                 const struct nfs_open_context *ctx,
4078                 const struct nfs_lock_context *l_ctx,
4079                 fmode_t fmode)
4080 {
4081         nfs4_stateid current_stateid;
4082
4083         /* If the current stateid represents a lost lock, then exit */
4084         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4085                 return true;
4086         return nfs4_stateid_match(stateid, &current_stateid);
4087 }
4088
4089 static bool nfs4_error_stateid_expired(int err)
4090 {
4091         switch (err) {
4092         case -NFS4ERR_DELEG_REVOKED:
4093         case -NFS4ERR_ADMIN_REVOKED:
4094         case -NFS4ERR_BAD_STATEID:
4095         case -NFS4ERR_STALE_STATEID:
4096         case -NFS4ERR_OLD_STATEID:
4097         case -NFS4ERR_OPENMODE:
4098         case -NFS4ERR_EXPIRED:
4099                 return true;
4100         }
4101         return false;
4102 }
4103
4104 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4105 {
4106         nfs_invalidate_atime(hdr->inode);
4107 }
4108
4109 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4110 {
4111         struct nfs_server *server = NFS_SERVER(hdr->inode);
4112
4113         trace_nfs4_read(hdr, task->tk_status);
4114         if (nfs4_async_handle_error(task, server,
4115                                     hdr->args.context->state,
4116                                     NULL) == -EAGAIN) {
4117                 rpc_restart_call_prepare(task);
4118                 return -EAGAIN;
4119         }
4120
4121         __nfs4_read_done_cb(hdr);
4122         if (task->tk_status > 0)
4123                 renew_lease(server, hdr->timestamp);
4124         return 0;
4125 }
4126
4127 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4128                 struct nfs_pgio_args *args)
4129 {
4130
4131         if (!nfs4_error_stateid_expired(task->tk_status) ||
4132                 nfs4_stateid_is_current(&args->stateid,
4133                                 args->context,
4134                                 args->lock_context,
4135                                 FMODE_READ))
4136                 return false;
4137         rpc_restart_call_prepare(task);
4138         return true;
4139 }
4140
4141 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4142 {
4143
4144         dprintk("--> %s\n", __func__);
4145
4146         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4147                 return -EAGAIN;
4148         if (nfs4_read_stateid_changed(task, &hdr->args))
4149                 return -EAGAIN;
4150         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4151                                     nfs4_read_done_cb(task, hdr);
4152 }
4153
4154 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4155                                  struct rpc_message *msg)
4156 {
4157         hdr->timestamp   = jiffies;
4158         hdr->pgio_done_cb = nfs4_read_done_cb;
4159         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4160         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4161 }
4162
4163 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4164                                       struct nfs_pgio_header *hdr)
4165 {
4166         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4167                         &hdr->args.seq_args,
4168                         &hdr->res.seq_res,
4169                         task))
4170                 return 0;
4171         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4172                                 hdr->args.lock_context,
4173                                 hdr->rw_ops->rw_mode) == -EIO)
4174                 return -EIO;
4175         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4176                 return -EIO;
4177         return 0;
4178 }
4179
4180 static int nfs4_write_done_cb(struct rpc_task *task,
4181                               struct nfs_pgio_header *hdr)
4182 {
4183         struct inode *inode = hdr->inode;
4184
4185         trace_nfs4_write(hdr, task->tk_status);
4186         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4187                                     hdr->args.context->state,
4188                                     NULL) == -EAGAIN) {
4189                 rpc_restart_call_prepare(task);
4190                 return -EAGAIN;
4191         }
4192         if (task->tk_status >= 0) {
4193                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4194                 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4195         }
4196         return 0;
4197 }
4198
4199 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4200                 struct nfs_pgio_args *args)
4201 {
4202
4203         if (!nfs4_error_stateid_expired(task->tk_status) ||
4204                 nfs4_stateid_is_current(&args->stateid,
4205                                 args->context,
4206                                 args->lock_context,
4207                                 FMODE_WRITE))
4208                 return false;
4209         rpc_restart_call_prepare(task);
4210         return true;
4211 }
4212
4213 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4214 {
4215         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4216                 return -EAGAIN;
4217         if (nfs4_write_stateid_changed(task, &hdr->args))
4218                 return -EAGAIN;
4219         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4220                 nfs4_write_done_cb(task, hdr);
4221 }
4222
4223 static
4224 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4225 {
4226         /* Don't request attributes for pNFS or O_DIRECT writes */
4227         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4228                 return false;
4229         /* Otherwise, request attributes if and only if we don't hold
4230          * a delegation
4231          */
4232         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4233 }
4234
4235 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4236                                   struct rpc_message *msg)
4237 {
4238         struct nfs_server *server = NFS_SERVER(hdr->inode);
4239
4240         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4241                 hdr->args.bitmask = NULL;
4242                 hdr->res.fattr = NULL;
4243         } else
4244                 hdr->args.bitmask = server->cache_consistency_bitmask;
4245
4246         if (!hdr->pgio_done_cb)
4247                 hdr->pgio_done_cb = nfs4_write_done_cb;
4248         hdr->res.server = server;
4249         hdr->timestamp   = jiffies;
4250
4251         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4252         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4253 }
4254
4255 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4256 {
4257         nfs4_setup_sequence(NFS_SERVER(data->inode),
4258                         &data->args.seq_args,
4259                         &data->res.seq_res,
4260                         task);
4261 }
4262
4263 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4264 {
4265         struct inode *inode = data->inode;
4266
4267         trace_nfs4_commit(data, task->tk_status);
4268         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4269                                     NULL, NULL) == -EAGAIN) {
4270                 rpc_restart_call_prepare(task);
4271                 return -EAGAIN;
4272         }
4273         return 0;
4274 }
4275
4276 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4277 {
4278         if (!nfs4_sequence_done(task, &data->res.seq_res))
4279                 return -EAGAIN;
4280         return data->commit_done_cb(task, data);
4281 }
4282
4283 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4284 {
4285         struct nfs_server *server = NFS_SERVER(data->inode);
4286
4287         if (data->commit_done_cb == NULL)
4288                 data->commit_done_cb = nfs4_commit_done_cb;
4289         data->res.server = server;
4290         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4291         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4292 }
4293
4294 struct nfs4_renewdata {
4295         struct nfs_client       *client;
4296         unsigned long           timestamp;
4297 };
4298
4299 /*
4300  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4301  * standalone procedure for queueing an asynchronous RENEW.
4302  */
4303 static void nfs4_renew_release(void *calldata)
4304 {
4305         struct nfs4_renewdata *data = calldata;
4306         struct nfs_client *clp = data->client;
4307
4308         if (atomic_read(&clp->cl_count) > 1)
4309                 nfs4_schedule_state_renewal(clp);
4310         nfs_put_client(clp);
4311         kfree(data);
4312 }
4313
4314 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4315 {
4316         struct nfs4_renewdata *data = calldata;
4317         struct nfs_client *clp = data->client;
4318         unsigned long timestamp = data->timestamp;
4319
4320         trace_nfs4_renew_async(clp, task->tk_status);
4321         switch (task->tk_status) {
4322         case 0:
4323                 break;
4324         case -NFS4ERR_LEASE_MOVED:
4325                 nfs4_schedule_lease_moved_recovery(clp);
4326                 break;
4327         default:
4328                 /* Unless we're shutting down, schedule state recovery! */
4329                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4330                         return;
4331                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4332                         nfs4_schedule_lease_recovery(clp);
4333                         return;
4334                 }
4335                 nfs4_schedule_path_down_recovery(clp);
4336         }
4337         do_renew_lease(clp, timestamp);
4338 }
4339
4340 static const struct rpc_call_ops nfs4_renew_ops = {
4341         .rpc_call_done = nfs4_renew_done,
4342         .rpc_release = nfs4_renew_release,
4343 };
4344
4345 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4346 {
4347         struct rpc_message msg = {
4348                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4349                 .rpc_argp       = clp,
4350                 .rpc_cred       = cred,
4351         };
4352         struct nfs4_renewdata *data;
4353
4354         if (renew_flags == 0)
4355                 return 0;
4356         if (!atomic_inc_not_zero(&clp->cl_count))
4357                 return -EIO;
4358         data = kmalloc(sizeof(*data), GFP_NOFS);
4359         if (data == NULL)
4360                 return -ENOMEM;
4361         data->client = clp;
4362         data->timestamp = jiffies;
4363         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4364                         &nfs4_renew_ops, data);
4365 }
4366
4367 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4368 {
4369         struct rpc_message msg = {
4370                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4371                 .rpc_argp       = clp,
4372                 .rpc_cred       = cred,
4373         };
4374         unsigned long now = jiffies;
4375         int status;
4376
4377         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4378         if (status < 0)
4379                 return status;
4380         do_renew_lease(clp, now);
4381         return 0;
4382 }
4383
4384 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4385 {
4386         return server->caps & NFS_CAP_ACLS;
4387 }
4388
4389 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4390  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4391  * the stack.
4392  */
4393 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4394
4395 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4396                 struct page **pages, unsigned int *pgbase)
4397 {
4398         struct page *newpage, **spages;
4399         int rc = 0;
4400         size_t len;
4401         spages = pages;
4402
4403         do {
4404                 len = min_t(size_t, PAGE_SIZE, buflen);
4405                 newpage = alloc_page(GFP_KERNEL);
4406
4407                 if (newpage == NULL)
4408                         goto unwind;
4409                 memcpy(page_address(newpage), buf, len);
4410                 buf += len;
4411                 buflen -= len;
4412                 *pages++ = newpage;
4413                 rc++;
4414         } while (buflen != 0);
4415
4416         return rc;
4417
4418 unwind:
4419         for(; rc > 0; rc--)
4420                 __free_page(spages[rc-1]);
4421         return -ENOMEM;
4422 }
4423
4424 struct nfs4_cached_acl {
4425         int cached;
4426         size_t len;
4427         char data[0];
4428 };
4429
4430 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4431 {
4432         struct nfs_inode *nfsi = NFS_I(inode);
4433
4434         spin_lock(&inode->i_lock);
4435         kfree(nfsi->nfs4_acl);
4436         nfsi->nfs4_acl = acl;
4437         spin_unlock(&inode->i_lock);
4438 }
4439
4440 static void nfs4_zap_acl_attr(struct inode *inode)
4441 {
4442         nfs4_set_cached_acl(inode, NULL);
4443 }
4444
4445 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4446 {
4447         struct nfs_inode *nfsi = NFS_I(inode);
4448         struct nfs4_cached_acl *acl;
4449         int ret = -ENOENT;
4450
4451         spin_lock(&inode->i_lock);
4452         acl = nfsi->nfs4_acl;
4453         if (acl == NULL)
4454                 goto out;
4455         if (buf == NULL) /* user is just asking for length */
4456                 goto out_len;
4457         if (acl->cached == 0)
4458                 goto out;
4459         ret = -ERANGE; /* see getxattr(2) man page */
4460         if (acl->len > buflen)
4461                 goto out;
4462         memcpy(buf, acl->data, acl->len);
4463 out_len:
4464         ret = acl->len;
4465 out:
4466         spin_unlock(&inode->i_lock);
4467         return ret;
4468 }
4469
4470 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4471 {
4472         struct nfs4_cached_acl *acl;
4473         size_t buflen = sizeof(*acl) + acl_len;
4474
4475         if (buflen <= PAGE_SIZE) {
4476                 acl = kmalloc(buflen, GFP_KERNEL);
4477                 if (acl == NULL)
4478                         goto out;
4479                 acl->cached = 1;
4480                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4481         } else {
4482                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4483                 if (acl == NULL)
4484                         goto out;
4485                 acl->cached = 0;
4486         }
4487         acl->len = acl_len;
4488 out:
4489         nfs4_set_cached_acl(inode, acl);
4490 }
4491
4492 /*
4493  * The getxattr API returns the required buffer length when called with a
4494  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4495  * the required buf.  On a NULL buf, we send a page of data to the server
4496  * guessing that the ACL request can be serviced by a page. If so, we cache
4497  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4498  * the cache. If not so, we throw away the page, and cache the required
4499  * length. The next getxattr call will then produce another round trip to
4500  * the server, this time with the input buf of the required size.
4501  */
4502 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4503 {
4504         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4505         struct nfs_getaclargs args = {
4506                 .fh = NFS_FH(inode),
4507                 .acl_pages = pages,
4508                 .acl_len = buflen,
4509         };
4510         struct nfs_getaclres res = {
4511                 .acl_len = buflen,
4512         };
4513         struct rpc_message msg = {
4514                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4515                 .rpc_argp = &args,
4516                 .rpc_resp = &res,
4517         };
4518         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4519         int ret = -ENOMEM, i;
4520
4521         /* As long as we're doing a round trip to the server anyway,
4522          * let's be prepared for a page of acl data. */
4523         if (npages == 0)
4524                 npages = 1;
4525         if (npages > ARRAY_SIZE(pages))
4526                 return -ERANGE;
4527
4528         for (i = 0; i < npages; i++) {
4529                 pages[i] = alloc_page(GFP_KERNEL);
4530                 if (!pages[i])
4531                         goto out_free;
4532         }
4533
4534         /* for decoding across pages */
4535         res.acl_scratch = alloc_page(GFP_KERNEL);
4536         if (!res.acl_scratch)
4537                 goto out_free;
4538
4539         args.acl_len = npages * PAGE_SIZE;
4540         args.acl_pgbase = 0;
4541
4542         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4543                 __func__, buf, buflen, npages, args.acl_len);
4544         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4545                              &msg, &args.seq_args, &res.seq_res, 0);
4546         if (ret)
4547                 goto out_free;
4548
4549         /* Handle the case where the passed-in buffer is too short */
4550         if (res.acl_flags & NFS4_ACL_TRUNC) {
4551                 /* Did the user only issue a request for the acl length? */
4552                 if (buf == NULL)
4553                         goto out_ok;
4554                 ret = -ERANGE;
4555                 goto out_free;
4556         }
4557         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4558         if (buf) {
4559                 if (res.acl_len > buflen) {
4560                         ret = -ERANGE;
4561                         goto out_free;
4562                 }
4563                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4564         }
4565 out_ok:
4566         ret = res.acl_len;
4567 out_free:
4568         for (i = 0; i < npages; i++)
4569                 if (pages[i])
4570                         __free_page(pages[i]);
4571         if (res.acl_scratch)
4572                 __free_page(res.acl_scratch);
4573         return ret;
4574 }
4575
4576 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4577 {
4578         struct nfs4_exception exception = { };
4579         ssize_t ret;
4580         do {
4581                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4582                 trace_nfs4_get_acl(inode, ret);
4583                 if (ret >= 0)
4584                         break;
4585                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4586         } while (exception.retry);
4587         return ret;
4588 }
4589
4590 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4591 {
4592         struct nfs_server *server = NFS_SERVER(inode);
4593         int ret;
4594
4595         if (!nfs4_server_supports_acls(server))
4596                 return -EOPNOTSUPP;
4597         ret = nfs_revalidate_inode(server, inode);
4598         if (ret < 0)
4599                 return ret;
4600         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4601                 nfs_zap_acl_cache(inode);
4602         ret = nfs4_read_cached_acl(inode, buf, buflen);
4603         if (ret != -ENOENT)
4604                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4605                  * but no cached acl data, just the acl length */
4606                 return ret;
4607         return nfs4_get_acl_uncached(inode, buf, buflen);
4608 }
4609
4610 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4611 {
4612         struct nfs_server *server = NFS_SERVER(inode);
4613         struct page *pages[NFS4ACL_MAXPAGES];
4614         struct nfs_setaclargs arg = {
4615                 .fh             = NFS_FH(inode),
4616                 .acl_pages      = pages,
4617                 .acl_len        = buflen,
4618         };
4619         struct nfs_setaclres res;
4620         struct rpc_message msg = {
4621                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4622                 .rpc_argp       = &arg,
4623                 .rpc_resp       = &res,
4624         };
4625         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4626         int ret, i;
4627
4628         if (!nfs4_server_supports_acls(server))
4629                 return -EOPNOTSUPP;
4630         if (npages > ARRAY_SIZE(pages))
4631                 return -ERANGE;
4632         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4633         if (i < 0)
4634                 return i;
4635         nfs4_inode_return_delegation(inode);
4636         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4637
4638         /*
4639          * Free each page after tx, so the only ref left is
4640          * held by the network stack
4641          */
4642         for (; i > 0; i--)
4643                 put_page(pages[i-1]);
4644
4645         /*
4646          * Acl update can result in inode attribute update.
4647          * so mark the attribute cache invalid.
4648          */
4649         spin_lock(&inode->i_lock);
4650         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4651         spin_unlock(&inode->i_lock);
4652         nfs_access_zap_cache(inode);
4653         nfs_zap_acl_cache(inode);
4654         return ret;
4655 }
4656
4657 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4658 {
4659         struct nfs4_exception exception = { };
4660         int err;
4661         do {
4662                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4663                 trace_nfs4_set_acl(inode, err);
4664                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4665                                 &exception);
4666         } while (exception.retry);
4667         return err;
4668 }
4669
4670 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4671 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4672                                         size_t buflen)
4673 {
4674         struct nfs_server *server = NFS_SERVER(inode);
4675         struct nfs_fattr fattr;
4676         struct nfs4_label label = {0, 0, buflen, buf};
4677
4678         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4679         struct nfs4_getattr_arg arg = {
4680                 .fh             = NFS_FH(inode),
4681                 .bitmask        = bitmask,
4682         };
4683         struct nfs4_getattr_res res = {
4684                 .fattr          = &fattr,
4685                 .label          = &label,
4686                 .server         = server,
4687         };
4688         struct rpc_message msg = {
4689                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4690                 .rpc_argp       = &arg,
4691                 .rpc_resp       = &res,
4692         };
4693         int ret;
4694
4695         nfs_fattr_init(&fattr);
4696
4697         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4698         if (ret)
4699                 return ret;
4700         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4701                 return -ENOENT;
4702         if (buflen < label.len)
4703                 return -ERANGE;
4704         return 0;
4705 }
4706
4707 static int nfs4_get_security_label(struct inode *inode, void *buf,
4708                                         size_t buflen)
4709 {
4710         struct nfs4_exception exception = { };
4711         int err;
4712
4713         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4714                 return -EOPNOTSUPP;
4715
4716         do {
4717                 err = _nfs4_get_security_label(inode, buf, buflen);
4718                 trace_nfs4_get_security_label(inode, err);
4719                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4720                                 &exception);
4721         } while (exception.retry);
4722         return err;
4723 }
4724
4725 static int _nfs4_do_set_security_label(struct inode *inode,
4726                 struct nfs4_label *ilabel,
4727                 struct nfs_fattr *fattr,
4728                 struct nfs4_label *olabel)
4729 {
4730
4731         struct iattr sattr = {0};
4732         struct nfs_server *server = NFS_SERVER(inode);
4733         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4734         struct nfs_setattrargs arg = {
4735                 .fh             = NFS_FH(inode),
4736                 .iap            = &sattr,
4737                 .server         = server,
4738                 .bitmask        = bitmask,
4739                 .label          = ilabel,
4740         };
4741         struct nfs_setattrres res = {
4742                 .fattr          = fattr,
4743                 .label          = olabel,
4744                 .server         = server,
4745         };
4746         struct rpc_message msg = {
4747                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4748                 .rpc_argp       = &arg,
4749                 .rpc_resp       = &res,
4750         };
4751         int status;
4752
4753         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4754
4755         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4756         if (status)
4757                 dprintk("%s failed: %d\n", __func__, status);
4758
4759         return status;
4760 }
4761
4762 static int nfs4_do_set_security_label(struct inode *inode,
4763                 struct nfs4_label *ilabel,
4764                 struct nfs_fattr *fattr,
4765                 struct nfs4_label *olabel)
4766 {
4767         struct nfs4_exception exception = { };
4768         int err;
4769
4770         do {
4771                 err = _nfs4_do_set_security_label(inode, ilabel,
4772                                 fattr, olabel);
4773                 trace_nfs4_set_security_label(inode, err);
4774                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4775                                 &exception);
4776         } while (exception.retry);
4777         return err;
4778 }
4779
4780 static int
4781 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4782 {
4783         struct nfs4_label ilabel, *olabel = NULL;
4784         struct nfs_fattr fattr;
4785         struct rpc_cred *cred;
4786         struct inode *inode = dentry->d_inode;
4787         int status;
4788
4789         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4790                 return -EOPNOTSUPP;
4791
4792         nfs_fattr_init(&fattr);
4793
4794         ilabel.pi = 0;
4795         ilabel.lfs = 0;
4796         ilabel.label = (char *)buf;
4797         ilabel.len = buflen;
4798
4799         cred = rpc_lookup_cred();
4800         if (IS_ERR(cred))
4801                 return PTR_ERR(cred);
4802
4803         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4804         if (IS_ERR(olabel)) {
4805                 status = -PTR_ERR(olabel);
4806                 goto out;
4807         }
4808
4809         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4810         if (status == 0)
4811                 nfs_setsecurity(inode, &fattr, olabel);
4812
4813         nfs4_label_free(olabel);
4814 out:
4815         put_rpccred(cred);
4816         return status;
4817 }
4818 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4819
4820
4821 static int
4822 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4823                         struct nfs4_state *state, long *timeout)
4824 {
4825         struct nfs_client *clp = server->nfs_client;
4826
4827         if (task->tk_status >= 0)
4828                 return 0;
4829         switch(task->tk_status) {
4830                 case -NFS4ERR_DELEG_REVOKED:
4831                 case -NFS4ERR_ADMIN_REVOKED:
4832                 case -NFS4ERR_BAD_STATEID:
4833                         if (state == NULL)
4834                                 break;
4835                         nfs_remove_bad_delegation(state->inode);
4836                 case -NFS4ERR_OPENMODE:
4837                         if (state == NULL)
4838                                 break;
4839                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4840                                 goto recovery_failed;
4841                         goto wait_on_recovery;
4842                 case -NFS4ERR_EXPIRED:
4843                         if (state != NULL) {
4844                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4845                                         goto recovery_failed;
4846                         }
4847                 case -NFS4ERR_STALE_STATEID:
4848                 case -NFS4ERR_STALE_CLIENTID:
4849                         nfs4_schedule_lease_recovery(clp);
4850                         goto wait_on_recovery;
4851                 case -NFS4ERR_MOVED:
4852                         if (nfs4_schedule_migration_recovery(server) < 0)
4853                                 goto recovery_failed;
4854                         goto wait_on_recovery;
4855                 case -NFS4ERR_LEASE_MOVED:
4856                         nfs4_schedule_lease_moved_recovery(clp);
4857                         goto wait_on_recovery;
4858 #if defined(CONFIG_NFS_V4_1)
4859                 case -NFS4ERR_BADSESSION:
4860                 case -NFS4ERR_BADSLOT:
4861                 case -NFS4ERR_BAD_HIGH_SLOT:
4862                 case -NFS4ERR_DEADSESSION:
4863                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4864                 case -NFS4ERR_SEQ_FALSE_RETRY:
4865                 case -NFS4ERR_SEQ_MISORDERED:
4866                         dprintk("%s ERROR %d, Reset session\n", __func__,
4867                                 task->tk_status);
4868                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4869                         goto wait_on_recovery;
4870 #endif /* CONFIG_NFS_V4_1 */
4871                 case -NFS4ERR_DELAY:
4872                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4873                         rpc_delay(task, nfs4_update_delay(timeout));
4874                         goto restart_call;
4875                 case -NFS4ERR_GRACE:
4876                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4877                 case -NFS4ERR_RETRY_UNCACHED_REP:
4878                 case -NFS4ERR_OLD_STATEID:
4879                         goto restart_call;
4880         }
4881         task->tk_status = nfs4_map_errors(task->tk_status);
4882         return 0;
4883 recovery_failed:
4884         task->tk_status = -EIO;
4885         return 0;
4886 wait_on_recovery:
4887         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4888         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4889                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4890         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4891                 goto recovery_failed;
4892 restart_call:
4893         task->tk_status = 0;
4894         return -EAGAIN;
4895 }
4896
4897 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4898                                     nfs4_verifier *bootverf)
4899 {
4900         __be32 verf[2];
4901
4902         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4903                 /* An impossible timestamp guarantees this value
4904                  * will never match a generated boot time. */
4905                 verf[0] = 0;
4906                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4907         } else {
4908                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4909                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4910                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4911         }
4912         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4913 }
4914
4915 static unsigned int
4916 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4917                                    char *buf, size_t len)
4918 {
4919         unsigned int result;
4920
4921         rcu_read_lock();
4922         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4923                                 clp->cl_ipaddr,
4924                                 rpc_peeraddr2str(clp->cl_rpcclient,
4925                                                         RPC_DISPLAY_ADDR),
4926                                 rpc_peeraddr2str(clp->cl_rpcclient,
4927                                                         RPC_DISPLAY_PROTO));
4928         rcu_read_unlock();
4929         return result;
4930 }
4931
4932 static unsigned int
4933 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4934                                 char *buf, size_t len)
4935 {
4936         const char *nodename = clp->cl_rpcclient->cl_nodename;
4937
4938         if (nfs4_client_id_uniquifier[0] != '\0')
4939                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4940                                 clp->rpc_ops->version,
4941                                 clp->cl_minorversion,
4942                                 nfs4_client_id_uniquifier,
4943                                 nodename);
4944         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4945                                 clp->rpc_ops->version, clp->cl_minorversion,
4946                                 nodename);
4947 }
4948
4949 /*
4950  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4951  * services.  Advertise one based on the address family of the
4952  * clientaddr.
4953  */
4954 static unsigned int
4955 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4956 {
4957         if (strchr(clp->cl_ipaddr, ':') != NULL)
4958                 return scnprintf(buf, len, "tcp6");
4959         else
4960                 return scnprintf(buf, len, "tcp");
4961 }
4962
4963 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4964 {
4965         struct nfs4_setclientid *sc = calldata;
4966
4967         if (task->tk_status == 0)
4968                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4969 }
4970
4971 static const struct rpc_call_ops nfs4_setclientid_ops = {
4972         .rpc_call_done = nfs4_setclientid_done,
4973 };
4974
4975 /**
4976  * nfs4_proc_setclientid - Negotiate client ID
4977  * @clp: state data structure
4978  * @program: RPC program for NFSv4 callback service
4979  * @port: IP port number for NFS4 callback service
4980  * @cred: RPC credential to use for this call
4981  * @res: where to place the result
4982  *
4983  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4984  */
4985 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4986                 unsigned short port, struct rpc_cred *cred,
4987                 struct nfs4_setclientid_res *res)
4988 {
4989         nfs4_verifier sc_verifier;
4990         struct nfs4_setclientid setclientid = {
4991                 .sc_verifier = &sc_verifier,
4992                 .sc_prog = program,
4993                 .sc_cb_ident = clp->cl_cb_ident,
4994         };
4995         struct rpc_message msg = {
4996                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4997                 .rpc_argp = &setclientid,
4998                 .rpc_resp = res,
4999                 .rpc_cred = cred,
5000         };
5001         struct rpc_task *task;
5002         struct rpc_task_setup task_setup_data = {
5003                 .rpc_client = clp->cl_rpcclient,
5004                 .rpc_message = &msg,
5005                 .callback_ops = &nfs4_setclientid_ops,
5006                 .callback_data = &setclientid,
5007                 .flags = RPC_TASK_TIMEOUT,
5008         };
5009         int status;
5010
5011         /* nfs_client_id4 */
5012         nfs4_init_boot_verifier(clp, &sc_verifier);
5013         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5014                 setclientid.sc_name_len =
5015                                 nfs4_init_uniform_client_string(clp,
5016                                                 setclientid.sc_name,
5017                                                 sizeof(setclientid.sc_name));
5018         else
5019                 setclientid.sc_name_len =
5020                                 nfs4_init_nonuniform_client_string(clp,
5021                                                 setclientid.sc_name,
5022                                                 sizeof(setclientid.sc_name));
5023         /* cb_client4 */
5024         setclientid.sc_netid_len =
5025                                 nfs4_init_callback_netid(clp,
5026                                                 setclientid.sc_netid,
5027                                                 sizeof(setclientid.sc_netid));
5028         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5029                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5030                                 clp->cl_ipaddr, port >> 8, port & 255);
5031
5032         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5033                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5034                 setclientid.sc_name_len, setclientid.sc_name);
5035         task = rpc_run_task(&task_setup_data);
5036         if (IS_ERR(task)) {
5037                 status = PTR_ERR(task);
5038                 goto out;
5039         }
5040         status = task->tk_status;
5041         if (setclientid.sc_cred) {
5042                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5043                 put_rpccred(setclientid.sc_cred);
5044         }
5045         rpc_put_task(task);
5046 out:
5047         trace_nfs4_setclientid(clp, status);
5048         dprintk("NFS reply setclientid: %d\n", status);
5049         return status;
5050 }
5051
5052 /**
5053  * nfs4_proc_setclientid_confirm - Confirm client ID
5054  * @clp: state data structure
5055  * @res: result of a previous SETCLIENTID
5056  * @cred: RPC credential to use for this call
5057  *
5058  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5059  */
5060 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5061                 struct nfs4_setclientid_res *arg,
5062                 struct rpc_cred *cred)
5063 {
5064         struct rpc_message msg = {
5065                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5066                 .rpc_argp = arg,
5067                 .rpc_cred = cred,
5068         };
5069         int status;
5070
5071         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5072                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5073                 clp->cl_clientid);
5074         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5075         trace_nfs4_setclientid_confirm(clp, status);
5076         dprintk("NFS reply setclientid_confirm: %d\n", status);
5077         return status;
5078 }
5079
5080 struct nfs4_delegreturndata {
5081         struct nfs4_delegreturnargs args;
5082         struct nfs4_delegreturnres res;
5083         struct nfs_fh fh;
5084         nfs4_stateid stateid;
5085         unsigned long timestamp;
5086         struct nfs_fattr fattr;
5087         int rpc_status;
5088         struct inode *inode;
5089         bool roc;
5090         u32 roc_barrier;
5091 };
5092
5093 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5094 {
5095         struct nfs4_delegreturndata *data = calldata;
5096
5097         if (!nfs4_sequence_done(task, &data->res.seq_res))
5098                 return;
5099
5100         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5101         switch (task->tk_status) {
5102         case 0:
5103                 renew_lease(data->res.server, data->timestamp);
5104         case -NFS4ERR_ADMIN_REVOKED:
5105         case -NFS4ERR_DELEG_REVOKED:
5106         case -NFS4ERR_BAD_STATEID:
5107         case -NFS4ERR_OLD_STATEID:
5108         case -NFS4ERR_STALE_STATEID:
5109         case -NFS4ERR_EXPIRED:
5110                 task->tk_status = 0;
5111                 if (data->roc)
5112                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5113                 break;
5114         default:
5115                 if (nfs4_async_handle_error(task, data->res.server,
5116                                             NULL, NULL) == -EAGAIN) {
5117                         rpc_restart_call_prepare(task);
5118                         return;
5119                 }
5120         }
5121         data->rpc_status = task->tk_status;
5122 }
5123
5124 static void nfs4_delegreturn_release(void *calldata)
5125 {
5126         struct nfs4_delegreturndata *data = calldata;
5127
5128         if (data->roc)
5129                 pnfs_roc_release(data->inode);
5130         kfree(calldata);
5131 }
5132
5133 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5134 {
5135         struct nfs4_delegreturndata *d_data;
5136
5137         d_data = (struct nfs4_delegreturndata *)data;
5138
5139         if (d_data->roc &&
5140             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5141                 return;
5142
5143         nfs4_setup_sequence(d_data->res.server,
5144                         &d_data->args.seq_args,
5145                         &d_data->res.seq_res,
5146                         task);
5147 }
5148
5149 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5150         .rpc_call_prepare = nfs4_delegreturn_prepare,
5151         .rpc_call_done = nfs4_delegreturn_done,
5152         .rpc_release = nfs4_delegreturn_release,
5153 };
5154
5155 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5156 {
5157         struct nfs4_delegreturndata *data;
5158         struct nfs_server *server = NFS_SERVER(inode);
5159         struct rpc_task *task;
5160         struct rpc_message msg = {
5161                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5162                 .rpc_cred = cred,
5163         };
5164         struct rpc_task_setup task_setup_data = {
5165                 .rpc_client = server->client,
5166                 .rpc_message = &msg,
5167                 .callback_ops = &nfs4_delegreturn_ops,
5168                 .flags = RPC_TASK_ASYNC,
5169         };
5170         int status = 0;
5171
5172         data = kzalloc(sizeof(*data), GFP_NOFS);
5173         if (data == NULL)
5174                 return -ENOMEM;
5175         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5176         data->args.fhandle = &data->fh;
5177         data->args.stateid = &data->stateid;
5178         data->args.bitmask = server->cache_consistency_bitmask;
5179         nfs_copy_fh(&data->fh, NFS_FH(inode));
5180         nfs4_stateid_copy(&data->stateid, stateid);
5181         data->res.fattr = &data->fattr;
5182         data->res.server = server;
5183         nfs_fattr_init(data->res.fattr);
5184         data->timestamp = jiffies;
5185         data->rpc_status = 0;
5186         data->inode = inode;
5187         data->roc = list_empty(&NFS_I(inode)->open_files) ?
5188                     pnfs_roc(inode) : false;
5189
5190         task_setup_data.callback_data = data;
5191         msg.rpc_argp = &data->args;
5192         msg.rpc_resp = &data->res;
5193         task = rpc_run_task(&task_setup_data);
5194         if (IS_ERR(task))
5195                 return PTR_ERR(task);
5196         if (!issync)
5197                 goto out;
5198         status = nfs4_wait_for_completion_rpc_task(task);
5199         if (status != 0)
5200                 goto out;
5201         status = data->rpc_status;
5202         if (status == 0)
5203                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5204         else
5205                 nfs_refresh_inode(inode, &data->fattr);
5206 out:
5207         rpc_put_task(task);
5208         return status;
5209 }
5210
5211 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5212 {
5213         struct nfs_server *server = NFS_SERVER(inode);
5214         struct nfs4_exception exception = { };
5215         int err;
5216         do {
5217                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5218                 trace_nfs4_delegreturn(inode, err);
5219                 switch (err) {
5220                         case -NFS4ERR_STALE_STATEID:
5221                         case -NFS4ERR_EXPIRED:
5222                         case 0:
5223                                 return 0;
5224                 }
5225                 err = nfs4_handle_exception(server, err, &exception);
5226         } while (exception.retry);
5227         return err;
5228 }
5229
5230 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5231 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5232
5233 /*
5234  * sleep, with exponential backoff, and retry the LOCK operation.
5235  */
5236 static unsigned long
5237 nfs4_set_lock_task_retry(unsigned long timeout)
5238 {
5239         freezable_schedule_timeout_killable_unsafe(timeout);
5240         timeout <<= 1;
5241         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5242                 return NFS4_LOCK_MAXTIMEOUT;
5243         return timeout;
5244 }
5245
5246 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5247 {
5248         struct inode *inode = state->inode;
5249         struct nfs_server *server = NFS_SERVER(inode);
5250         struct nfs_client *clp = server->nfs_client;
5251         struct nfs_lockt_args arg = {
5252                 .fh = NFS_FH(inode),
5253                 .fl = request,
5254         };
5255         struct nfs_lockt_res res = {
5256                 .denied = request,
5257         };
5258         struct rpc_message msg = {
5259                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5260                 .rpc_argp       = &arg,
5261                 .rpc_resp       = &res,
5262                 .rpc_cred       = state->owner->so_cred,
5263         };
5264         struct nfs4_lock_state *lsp;
5265         int status;
5266
5267         arg.lock_owner.clientid = clp->cl_clientid;
5268         status = nfs4_set_lock_state(state, request);
5269         if (status != 0)
5270                 goto out;
5271         lsp = request->fl_u.nfs4_fl.owner;
5272         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5273         arg.lock_owner.s_dev = server->s_dev;
5274         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5275         switch (status) {
5276                 case 0:
5277                         request->fl_type = F_UNLCK;
5278                         break;
5279                 case -NFS4ERR_DENIED:
5280                         status = 0;
5281         }
5282         request->fl_ops->fl_release_private(request);
5283         request->fl_ops = NULL;
5284 out:
5285         return status;
5286 }
5287
5288 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5289 {
5290         struct nfs4_exception exception = { };
5291         int err;
5292
5293         do {
5294                 err = _nfs4_proc_getlk(state, cmd, request);
5295                 trace_nfs4_get_lock(request, state, cmd, err);
5296                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5297                                 &exception);
5298         } while (exception.retry);
5299         return err;
5300 }
5301
5302 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5303 {
5304         int res = 0;
5305         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5306                 case FL_POSIX:
5307                         res = posix_lock_file_wait(file, fl);
5308                         break;
5309                 case FL_FLOCK:
5310                         res = flock_lock_file_wait(file, fl);
5311                         break;
5312                 default:
5313                         BUG();
5314         }
5315         return res;
5316 }
5317
5318 struct nfs4_unlockdata {
5319         struct nfs_locku_args arg;
5320         struct nfs_locku_res res;
5321         struct nfs4_lock_state *lsp;
5322         struct nfs_open_context *ctx;
5323         struct file_lock fl;
5324         const struct nfs_server *server;
5325         unsigned long timestamp;
5326 };
5327
5328 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5329                 struct nfs_open_context *ctx,
5330                 struct nfs4_lock_state *lsp,
5331                 struct nfs_seqid *seqid)
5332 {
5333         struct nfs4_unlockdata *p;
5334         struct inode *inode = lsp->ls_state->inode;
5335
5336         p = kzalloc(sizeof(*p), GFP_NOFS);
5337         if (p == NULL)
5338                 return NULL;
5339         p->arg.fh = NFS_FH(inode);
5340         p->arg.fl = &p->fl;
5341         p->arg.seqid = seqid;
5342         p->res.seqid = seqid;
5343         p->arg.stateid = &lsp->ls_stateid;
5344         p->lsp = lsp;
5345         atomic_inc(&lsp->ls_count);
5346         /* Ensure we don't close file until we're done freeing locks! */
5347         p->ctx = get_nfs_open_context(ctx);
5348         memcpy(&p->fl, fl, sizeof(p->fl));
5349         p->server = NFS_SERVER(inode);
5350         return p;
5351 }
5352
5353 static void nfs4_locku_release_calldata(void *data)
5354 {
5355         struct nfs4_unlockdata *calldata = data;
5356         nfs_free_seqid(calldata->arg.seqid);
5357         nfs4_put_lock_state(calldata->lsp);
5358         put_nfs_open_context(calldata->ctx);
5359         kfree(calldata);
5360 }
5361
5362 static void nfs4_locku_done(struct rpc_task *task, void *data)
5363 {
5364         struct nfs4_unlockdata *calldata = data;
5365
5366         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5367                 return;
5368         switch (task->tk_status) {
5369                 case 0:
5370                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5371                                         &calldata->res.stateid);
5372                         renew_lease(calldata->server, calldata->timestamp);
5373                         break;
5374                 case -NFS4ERR_BAD_STATEID:
5375                 case -NFS4ERR_OLD_STATEID:
5376                 case -NFS4ERR_STALE_STATEID:
5377                 case -NFS4ERR_EXPIRED:
5378                         break;
5379                 default:
5380                         if (nfs4_async_handle_error(task, calldata->server,
5381                                                     NULL, NULL) == -EAGAIN)
5382                                 rpc_restart_call_prepare(task);
5383         }
5384         nfs_release_seqid(calldata->arg.seqid);
5385 }
5386
5387 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5388 {
5389         struct nfs4_unlockdata *calldata = data;
5390
5391         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5392                 goto out_wait;
5393         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5394                 /* Note: exit _without_ running nfs4_locku_done */
5395                 goto out_no_action;
5396         }
5397         calldata->timestamp = jiffies;
5398         if (nfs4_setup_sequence(calldata->server,
5399                                 &calldata->arg.seq_args,
5400                                 &calldata->res.seq_res,
5401                                 task) != 0)
5402                 nfs_release_seqid(calldata->arg.seqid);
5403         return;
5404 out_no_action:
5405         task->tk_action = NULL;
5406 out_wait:
5407         nfs4_sequence_done(task, &calldata->res.seq_res);
5408 }
5409
5410 static const struct rpc_call_ops nfs4_locku_ops = {
5411         .rpc_call_prepare = nfs4_locku_prepare,
5412         .rpc_call_done = nfs4_locku_done,
5413         .rpc_release = nfs4_locku_release_calldata,
5414 };
5415
5416 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5417                 struct nfs_open_context *ctx,
5418                 struct nfs4_lock_state *lsp,
5419                 struct nfs_seqid *seqid)
5420 {
5421         struct nfs4_unlockdata *data;
5422         struct rpc_message msg = {
5423                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5424                 .rpc_cred = ctx->cred,
5425         };
5426         struct rpc_task_setup task_setup_data = {
5427                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5428                 .rpc_message = &msg,
5429                 .callback_ops = &nfs4_locku_ops,
5430                 .workqueue = nfsiod_workqueue,
5431                 .flags = RPC_TASK_ASYNC,
5432         };
5433
5434         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5435                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5436
5437         /* Ensure this is an unlock - when canceling a lock, the
5438          * canceled lock is passed in, and it won't be an unlock.
5439          */
5440         fl->fl_type = F_UNLCK;
5441
5442         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5443         if (data == NULL) {
5444                 nfs_free_seqid(seqid);
5445                 return ERR_PTR(-ENOMEM);
5446         }
5447
5448         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5449         msg.rpc_argp = &data->arg;
5450         msg.rpc_resp = &data->res;
5451         task_setup_data.callback_data = data;
5452         return rpc_run_task(&task_setup_data);
5453 }
5454
5455 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5456 {
5457         struct inode *inode = state->inode;
5458         struct nfs4_state_owner *sp = state->owner;
5459         struct nfs_inode *nfsi = NFS_I(inode);
5460         struct nfs_seqid *seqid;
5461         struct nfs4_lock_state *lsp;
5462         struct rpc_task *task;
5463         int status = 0;
5464         unsigned char fl_flags = request->fl_flags;
5465
5466         status = nfs4_set_lock_state(state, request);
5467         /* Unlock _before_ we do the RPC call */
5468         request->fl_flags |= FL_EXISTS;
5469         /* Exclude nfs_delegation_claim_locks() */
5470         mutex_lock(&sp->so_delegreturn_mutex);
5471         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5472         down_read(&nfsi->rwsem);
5473         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5474                 up_read(&nfsi->rwsem);
5475                 mutex_unlock(&sp->so_delegreturn_mutex);
5476                 goto out;
5477         }
5478         up_read(&nfsi->rwsem);
5479         mutex_unlock(&sp->so_delegreturn_mutex);
5480         if (status != 0)
5481                 goto out;
5482         /* Is this a delegated lock? */
5483         lsp = request->fl_u.nfs4_fl.owner;
5484         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5485                 goto out;
5486         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5487         status = -ENOMEM;
5488         if (seqid == NULL)
5489                 goto out;
5490         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5491         status = PTR_ERR(task);
5492         if (IS_ERR(task))
5493                 goto out;
5494         status = nfs4_wait_for_completion_rpc_task(task);
5495         rpc_put_task(task);
5496 out:
5497         request->fl_flags = fl_flags;
5498         trace_nfs4_unlock(request, state, F_SETLK, status);
5499         return status;
5500 }
5501
5502 struct nfs4_lockdata {
5503         struct nfs_lock_args arg;
5504         struct nfs_lock_res res;
5505         struct nfs4_lock_state *lsp;
5506         struct nfs_open_context *ctx;
5507         struct file_lock fl;
5508         unsigned long timestamp;
5509         int rpc_status;
5510         int cancelled;
5511         struct nfs_server *server;
5512 };
5513
5514 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5515                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5516                 gfp_t gfp_mask)
5517 {
5518         struct nfs4_lockdata *p;
5519         struct inode *inode = lsp->ls_state->inode;
5520         struct nfs_server *server = NFS_SERVER(inode);
5521
5522         p = kzalloc(sizeof(*p), gfp_mask);
5523         if (p == NULL)
5524                 return NULL;
5525
5526         p->arg.fh = NFS_FH(inode);
5527         p->arg.fl = &p->fl;
5528         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5529         if (p->arg.open_seqid == NULL)
5530                 goto out_free;
5531         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5532         if (p->arg.lock_seqid == NULL)
5533                 goto out_free_seqid;
5534         p->arg.lock_stateid = &lsp->ls_stateid;
5535         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5536         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5537         p->arg.lock_owner.s_dev = server->s_dev;
5538         p->res.lock_seqid = p->arg.lock_seqid;
5539         p->lsp = lsp;
5540         p->server = server;
5541         atomic_inc(&lsp->ls_count);
5542         p->ctx = get_nfs_open_context(ctx);
5543         memcpy(&p->fl, fl, sizeof(p->fl));
5544         return p;
5545 out_free_seqid:
5546         nfs_free_seqid(p->arg.open_seqid);
5547 out_free:
5548         kfree(p);
5549         return NULL;
5550 }
5551
5552 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5553 {
5554         struct nfs4_lockdata *data = calldata;
5555         struct nfs4_state *state = data->lsp->ls_state;
5556
5557         dprintk("%s: begin!\n", __func__);
5558         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5559                 goto out_wait;
5560         /* Do we need to do an open_to_lock_owner? */
5561         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5562                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5563                         goto out_release_lock_seqid;
5564                 }
5565                 data->arg.open_stateid = &state->open_stateid;
5566                 data->arg.new_lock_owner = 1;
5567                 data->res.open_seqid = data->arg.open_seqid;
5568         } else
5569                 data->arg.new_lock_owner = 0;
5570         if (!nfs4_valid_open_stateid(state)) {
5571                 data->rpc_status = -EBADF;
5572                 task->tk_action = NULL;
5573                 goto out_release_open_seqid;
5574         }
5575         data->timestamp = jiffies;
5576         if (nfs4_setup_sequence(data->server,
5577                                 &data->arg.seq_args,
5578                                 &data->res.seq_res,
5579                                 task) == 0)
5580                 return;
5581 out_release_open_seqid:
5582         nfs_release_seqid(data->arg.open_seqid);
5583 out_release_lock_seqid:
5584         nfs_release_seqid(data->arg.lock_seqid);
5585 out_wait:
5586         nfs4_sequence_done(task, &data->res.seq_res);
5587         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5588 }
5589
5590 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5591 {
5592         struct nfs4_lockdata *data = calldata;
5593
5594         dprintk("%s: begin!\n", __func__);
5595
5596         if (!nfs4_sequence_done(task, &data->res.seq_res))
5597                 return;
5598
5599         data->rpc_status = task->tk_status;
5600         if (data->arg.new_lock_owner != 0) {
5601                 if (data->rpc_status == 0)
5602                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5603                 else
5604                         goto out;
5605         }
5606         if (data->rpc_status == 0) {
5607                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5608                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5609                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5610         }
5611 out:
5612         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5613 }
5614
5615 static void nfs4_lock_release(void *calldata)
5616 {
5617         struct nfs4_lockdata *data = calldata;
5618
5619         dprintk("%s: begin!\n", __func__);
5620         nfs_free_seqid(data->arg.open_seqid);
5621         if (data->cancelled != 0) {
5622                 struct rpc_task *task;
5623                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5624                                 data->arg.lock_seqid);
5625                 if (!IS_ERR(task))
5626                         rpc_put_task_async(task);
5627                 dprintk("%s: cancelling lock!\n", __func__);
5628         } else
5629                 nfs_free_seqid(data->arg.lock_seqid);
5630         nfs4_put_lock_state(data->lsp);
5631         put_nfs_open_context(data->ctx);
5632         kfree(data);
5633         dprintk("%s: done!\n", __func__);
5634 }
5635
5636 static const struct rpc_call_ops nfs4_lock_ops = {
5637         .rpc_call_prepare = nfs4_lock_prepare,
5638         .rpc_call_done = nfs4_lock_done,
5639         .rpc_release = nfs4_lock_release,
5640 };
5641
5642 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5643 {
5644         switch (error) {
5645         case -NFS4ERR_ADMIN_REVOKED:
5646         case -NFS4ERR_BAD_STATEID:
5647                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5648                 if (new_lock_owner != 0 ||
5649                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5650                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5651                 break;
5652         case -NFS4ERR_STALE_STATEID:
5653                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5654         case -NFS4ERR_EXPIRED:
5655                 nfs4_schedule_lease_recovery(server->nfs_client);
5656         };
5657 }
5658
5659 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5660 {
5661         struct nfs4_lockdata *data;
5662         struct rpc_task *task;
5663         struct rpc_message msg = {
5664                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5665                 .rpc_cred = state->owner->so_cred,
5666         };
5667         struct rpc_task_setup task_setup_data = {
5668                 .rpc_client = NFS_CLIENT(state->inode),
5669                 .rpc_message = &msg,
5670                 .callback_ops = &nfs4_lock_ops,
5671                 .workqueue = nfsiod_workqueue,
5672                 .flags = RPC_TASK_ASYNC,
5673         };
5674         int ret;
5675
5676         dprintk("%s: begin!\n", __func__);
5677         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5678                         fl->fl_u.nfs4_fl.owner,
5679                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5680         if (data == NULL)
5681                 return -ENOMEM;
5682         if (IS_SETLKW(cmd))
5683                 data->arg.block = 1;
5684         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5685         msg.rpc_argp = &data->arg;
5686         msg.rpc_resp = &data->res;
5687         task_setup_data.callback_data = data;
5688         if (recovery_type > NFS_LOCK_NEW) {
5689                 if (recovery_type == NFS_LOCK_RECLAIM)
5690                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5691                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5692         }
5693         task = rpc_run_task(&task_setup_data);
5694         if (IS_ERR(task))
5695                 return PTR_ERR(task);
5696         ret = nfs4_wait_for_completion_rpc_task(task);
5697         if (ret == 0) {
5698                 ret = data->rpc_status;
5699                 if (ret)
5700                         nfs4_handle_setlk_error(data->server, data->lsp,
5701                                         data->arg.new_lock_owner, ret);
5702         } else
5703                 data->cancelled = 1;
5704         rpc_put_task(task);
5705         dprintk("%s: done, ret = %d!\n", __func__, ret);
5706         return ret;
5707 }
5708
5709 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5710 {
5711         struct nfs_server *server = NFS_SERVER(state->inode);
5712         struct nfs4_exception exception = {
5713                 .inode = state->inode,
5714         };
5715         int err;
5716
5717         do {
5718                 /* Cache the lock if possible... */
5719                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5720                         return 0;
5721                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5722                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5723                 if (err != -NFS4ERR_DELAY)
5724                         break;
5725                 nfs4_handle_exception(server, err, &exception);
5726         } while (exception.retry);
5727         return err;
5728 }
5729
5730 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5731 {
5732         struct nfs_server *server = NFS_SERVER(state->inode);
5733         struct nfs4_exception exception = {
5734                 .inode = state->inode,
5735         };
5736         int err;
5737
5738         err = nfs4_set_lock_state(state, request);
5739         if (err != 0)
5740                 return err;
5741         if (!recover_lost_locks) {
5742                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5743                 return 0;
5744         }
5745         do {
5746                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5747                         return 0;
5748                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5749                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5750                 switch (err) {
5751                 default:
5752                         goto out;
5753                 case -NFS4ERR_GRACE:
5754                 case -NFS4ERR_DELAY:
5755                         nfs4_handle_exception(server, err, &exception);
5756                         err = 0;
5757                 }
5758         } while (exception.retry);
5759 out:
5760         return err;
5761 }
5762
5763 #if defined(CONFIG_NFS_V4_1)
5764 /**
5765  * nfs41_check_expired_locks - possibly free a lock stateid
5766  *
5767  * @state: NFSv4 state for an inode
5768  *
5769  * Returns NFS_OK if recovery for this stateid is now finished.
5770  * Otherwise a negative NFS4ERR value is returned.
5771  */
5772 static int nfs41_check_expired_locks(struct nfs4_state *state)
5773 {
5774         int status, ret = -NFS4ERR_BAD_STATEID;
5775         struct nfs4_lock_state *lsp;
5776         struct nfs_server *server = NFS_SERVER(state->inode);
5777
5778         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5779                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5780                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5781
5782                         status = nfs41_test_stateid(server,
5783                                         &lsp->ls_stateid,
5784                                         cred);
5785                         trace_nfs4_test_lock_stateid(state, lsp, status);
5786                         if (status != NFS_OK) {
5787                                 /* Free the stateid unless the server
5788                                  * informs us the stateid is unrecognized. */
5789                                 if (status != -NFS4ERR_BAD_STATEID)
5790                                         nfs41_free_stateid(server,
5791                                                         &lsp->ls_stateid,
5792                                                         cred);
5793                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5794                                 ret = status;
5795                         }
5796                 }
5797         };
5798
5799         return ret;
5800 }
5801
5802 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5803 {
5804         int status = NFS_OK;
5805
5806         if (test_bit(LK_STATE_IN_USE, &state->flags))
5807                 status = nfs41_check_expired_locks(state);
5808         if (status != NFS_OK)
5809                 status = nfs4_lock_expired(state, request);
5810         return status;
5811 }
5812 #endif
5813
5814 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5815 {
5816         struct nfs4_state_owner *sp = state->owner;
5817         struct nfs_inode *nfsi = NFS_I(state->inode);
5818         unsigned char fl_flags = request->fl_flags;
5819         unsigned int seq;
5820         int status = -ENOLCK;
5821
5822         if ((fl_flags & FL_POSIX) &&
5823                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5824                 goto out;
5825         /* Is this a delegated open? */
5826         status = nfs4_set_lock_state(state, request);
5827         if (status != 0)
5828                 goto out;
5829         request->fl_flags |= FL_ACCESS;
5830         status = do_vfs_lock(request->fl_file, request);
5831         if (status < 0)
5832                 goto out;
5833         down_read(&nfsi->rwsem);
5834         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5835                 /* Yes: cache locks! */
5836                 /* ...but avoid races with delegation recall... */
5837                 request->fl_flags = fl_flags & ~FL_SLEEP;
5838                 status = do_vfs_lock(request->fl_file, request);
5839                 goto out_unlock;
5840         }
5841         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5842         up_read(&nfsi->rwsem);
5843         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5844         if (status != 0)
5845                 goto out;
5846         down_read(&nfsi->rwsem);
5847         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5848                 status = -NFS4ERR_DELAY;
5849                 goto out_unlock;
5850         }
5851         /* Note: we always want to sleep here! */
5852         request->fl_flags = fl_flags | FL_SLEEP;
5853         if (do_vfs_lock(request->fl_file, request) < 0)
5854                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5855                         "manager!\n", __func__);
5856 out_unlock:
5857         up_read(&nfsi->rwsem);
5858 out:
5859         request->fl_flags = fl_flags;
5860         return status;
5861 }
5862
5863 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5864 {
5865         struct nfs4_exception exception = {
5866                 .state = state,
5867                 .inode = state->inode,
5868         };
5869         int err;
5870
5871         do {
5872                 err = _nfs4_proc_setlk(state, cmd, request);
5873                 trace_nfs4_set_lock(request, state, cmd, err);
5874                 if (err == -NFS4ERR_DENIED)
5875                         err = -EAGAIN;
5876                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5877                                 err, &exception);
5878         } while (exception.retry);
5879         return err;
5880 }
5881
5882 static int
5883 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5884 {
5885         struct nfs_open_context *ctx;
5886         struct nfs4_state *state;
5887         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5888         int status;
5889
5890         /* verify open state */
5891         ctx = nfs_file_open_context(filp);
5892         state = ctx->state;
5893
5894         if (request->fl_start < 0 || request->fl_end < 0)
5895                 return -EINVAL;
5896
5897         if (IS_GETLK(cmd)) {
5898                 if (state != NULL)
5899                         return nfs4_proc_getlk(state, F_GETLK, request);
5900                 return 0;
5901         }
5902
5903         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5904                 return -EINVAL;
5905
5906         if (request->fl_type == F_UNLCK) {
5907                 if (state != NULL)
5908                         return nfs4_proc_unlck(state, cmd, request);
5909                 return 0;
5910         }
5911
5912         if (state == NULL)
5913                 return -ENOLCK;
5914         /*
5915          * Don't rely on the VFS having checked the file open mode,
5916          * since it won't do this for flock() locks.
5917          */
5918         switch (request->fl_type) {
5919         case F_RDLCK:
5920                 if (!(filp->f_mode & FMODE_READ))
5921                         return -EBADF;
5922                 break;
5923         case F_WRLCK:
5924                 if (!(filp->f_mode & FMODE_WRITE))
5925                         return -EBADF;
5926         }
5927
5928         do {
5929                 status = nfs4_proc_setlk(state, cmd, request);
5930                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5931                         break;
5932                 timeout = nfs4_set_lock_task_retry(timeout);
5933                 status = -ERESTARTSYS;
5934                 if (signalled())
5935                         break;
5936         } while(status < 0);
5937         return status;
5938 }
5939
5940 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5941 {
5942         struct nfs_server *server = NFS_SERVER(state->inode);
5943         int err;
5944
5945         err = nfs4_set_lock_state(state, fl);
5946         if (err != 0)
5947                 return err;
5948         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5949         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5950 }
5951
5952 struct nfs_release_lockowner_data {
5953         struct nfs4_lock_state *lsp;
5954         struct nfs_server *server;
5955         struct nfs_release_lockowner_args args;
5956         struct nfs_release_lockowner_res res;
5957         unsigned long timestamp;
5958 };
5959
5960 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5961 {
5962         struct nfs_release_lockowner_data *data = calldata;
5963         struct nfs_server *server = data->server;
5964         nfs40_setup_sequence(server, &data->args.seq_args,
5965                                 &data->res.seq_res, task);
5966         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5967         data->timestamp = jiffies;
5968 }
5969
5970 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5971 {
5972         struct nfs_release_lockowner_data *data = calldata;
5973         struct nfs_server *server = data->server;
5974
5975         nfs40_sequence_done(task, &data->res.seq_res);
5976
5977         switch (task->tk_status) {
5978         case 0:
5979                 renew_lease(server, data->timestamp);
5980                 break;
5981         case -NFS4ERR_STALE_CLIENTID:
5982         case -NFS4ERR_EXPIRED:
5983                 nfs4_schedule_lease_recovery(server->nfs_client);
5984                 break;
5985         case -NFS4ERR_LEASE_MOVED:
5986         case -NFS4ERR_DELAY:
5987                 if (nfs4_async_handle_error(task, server,
5988                                             NULL, NULL) == -EAGAIN)
5989                         rpc_restart_call_prepare(task);
5990         }
5991 }
5992
5993 static void nfs4_release_lockowner_release(void *calldata)
5994 {
5995         struct nfs_release_lockowner_data *data = calldata;
5996         nfs4_free_lock_state(data->server, data->lsp);
5997         kfree(calldata);
5998 }
5999
6000 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6001         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6002         .rpc_call_done = nfs4_release_lockowner_done,
6003         .rpc_release = nfs4_release_lockowner_release,
6004 };
6005
6006 static void
6007 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6008 {
6009         struct nfs_release_lockowner_data *data;
6010         struct rpc_message msg = {
6011                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6012         };
6013
6014         if (server->nfs_client->cl_mvops->minor_version != 0)
6015                 return;
6016
6017         data = kmalloc(sizeof(*data), GFP_NOFS);
6018         if (!data)
6019                 return;
6020         data->lsp = lsp;
6021         data->server = server;
6022         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6023         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6024         data->args.lock_owner.s_dev = server->s_dev;
6025
6026         msg.rpc_argp = &data->args;
6027         msg.rpc_resp = &data->res;
6028         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6029         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6030 }
6031
6032 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6033
6034 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6035                                    const void *buf, size_t buflen,
6036                                    int flags, int type)
6037 {
6038         if (strcmp(key, "") != 0)
6039                 return -EINVAL;
6040
6041         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6042 }
6043
6044 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6045                                    void *buf, size_t buflen, int type)
6046 {
6047         if (strcmp(key, "") != 0)
6048                 return -EINVAL;
6049
6050         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6051 }
6052
6053 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6054                                        size_t list_len, const char *name,
6055                                        size_t name_len, int type)
6056 {
6057         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6058
6059         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6060                 return 0;
6061
6062         if (list && len <= list_len)
6063                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6064         return len;
6065 }
6066
6067 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6068 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6069 {
6070         return server->caps & NFS_CAP_SECURITY_LABEL;
6071 }
6072
6073 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6074                                    const void *buf, size_t buflen,
6075                                    int flags, int type)
6076 {
6077         if (security_ismaclabel(key))
6078                 return nfs4_set_security_label(dentry, buf, buflen);
6079
6080         return -EOPNOTSUPP;
6081 }
6082
6083 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6084                                    void *buf, size_t buflen, int type)
6085 {
6086         if (security_ismaclabel(key))
6087                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6088         return -EOPNOTSUPP;
6089 }
6090
6091 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6092                                        size_t list_len, const char *name,
6093                                        size_t name_len, int type)
6094 {
6095         size_t len = 0;
6096
6097         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6098                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6099                 if (list && len <= list_len)
6100                         security_inode_listsecurity(dentry->d_inode, list, len);
6101         }
6102         return len;
6103 }
6104
6105 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6106         .prefix = XATTR_SECURITY_PREFIX,
6107         .list   = nfs4_xattr_list_nfs4_label,
6108         .get    = nfs4_xattr_get_nfs4_label,
6109         .set    = nfs4_xattr_set_nfs4_label,
6110 };
6111 #endif
6112
6113
6114 /*
6115  * nfs_fhget will use either the mounted_on_fileid or the fileid
6116  */
6117 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6118 {
6119         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6120                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6121               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6122               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6123                 return;
6124
6125         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6126                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6127         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6128         fattr->nlink = 2;
6129 }
6130
6131 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6132                                    const struct qstr *name,
6133                                    struct nfs4_fs_locations *fs_locations,
6134                                    struct page *page)
6135 {
6136         struct nfs_server *server = NFS_SERVER(dir);
6137         u32 bitmask[3] = {
6138                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6139         };
6140         struct nfs4_fs_locations_arg args = {
6141                 .dir_fh = NFS_FH(dir),
6142                 .name = name,
6143                 .page = page,
6144                 .bitmask = bitmask,
6145         };
6146         struct nfs4_fs_locations_res res = {
6147                 .fs_locations = fs_locations,
6148         };
6149         struct rpc_message msg = {
6150                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6151                 .rpc_argp = &args,
6152                 .rpc_resp = &res,
6153         };
6154         int status;
6155
6156         dprintk("%s: start\n", __func__);
6157
6158         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6159          * is not supported */
6160         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6161                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6162         else
6163                 bitmask[0] |= FATTR4_WORD0_FILEID;
6164
6165         nfs_fattr_init(&fs_locations->fattr);
6166         fs_locations->server = server;
6167         fs_locations->nlocations = 0;
6168         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6169         dprintk("%s: returned status = %d\n", __func__, status);
6170         return status;
6171 }
6172
6173 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6174                            const struct qstr *name,
6175                            struct nfs4_fs_locations *fs_locations,
6176                            struct page *page)
6177 {
6178         struct nfs4_exception exception = { };
6179         int err;
6180         do {
6181                 err = _nfs4_proc_fs_locations(client, dir, name,
6182                                 fs_locations, page);
6183                 trace_nfs4_get_fs_locations(dir, name, err);
6184                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6185                                 &exception);
6186         } while (exception.retry);
6187         return err;
6188 }
6189
6190 /*
6191  * This operation also signals the server that this client is
6192  * performing migration recovery.  The server can stop returning
6193  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6194  * appended to this compound to identify the client ID which is
6195  * performing recovery.
6196  */
6197 static int _nfs40_proc_get_locations(struct inode *inode,
6198                                      struct nfs4_fs_locations *locations,
6199                                      struct page *page, struct rpc_cred *cred)
6200 {
6201         struct nfs_server *server = NFS_SERVER(inode);
6202         struct rpc_clnt *clnt = server->client;
6203         u32 bitmask[2] = {
6204                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6205         };
6206         struct nfs4_fs_locations_arg args = {
6207                 .clientid       = server->nfs_client->cl_clientid,
6208                 .fh             = NFS_FH(inode),
6209                 .page           = page,
6210                 .bitmask        = bitmask,
6211                 .migration      = 1,            /* skip LOOKUP */
6212                 .renew          = 1,            /* append RENEW */
6213         };
6214         struct nfs4_fs_locations_res res = {
6215                 .fs_locations   = locations,
6216                 .migration      = 1,
6217                 .renew          = 1,
6218         };
6219         struct rpc_message msg = {
6220                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6221                 .rpc_argp       = &args,
6222                 .rpc_resp       = &res,
6223                 .rpc_cred       = cred,
6224         };
6225         unsigned long now = jiffies;
6226         int status;
6227
6228         nfs_fattr_init(&locations->fattr);
6229         locations->server = server;
6230         locations->nlocations = 0;
6231
6232         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6233         nfs4_set_sequence_privileged(&args.seq_args);
6234         status = nfs4_call_sync_sequence(clnt, server, &msg,
6235                                         &args.seq_args, &res.seq_res);
6236         if (status)
6237                 return status;
6238
6239         renew_lease(server, now);
6240         return 0;
6241 }
6242
6243 #ifdef CONFIG_NFS_V4_1
6244
6245 /*
6246  * This operation also signals the server that this client is
6247  * performing migration recovery.  The server can stop asserting
6248  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6249  * performing this operation is identified in the SEQUENCE
6250  * operation in this compound.
6251  *
6252  * When the client supports GETATTR(fs_locations_info), it can
6253  * be plumbed in here.
6254  */
6255 static int _nfs41_proc_get_locations(struct inode *inode,
6256                                      struct nfs4_fs_locations *locations,
6257                                      struct page *page, struct rpc_cred *cred)
6258 {
6259         struct nfs_server *server = NFS_SERVER(inode);
6260         struct rpc_clnt *clnt = server->client;
6261         u32 bitmask[2] = {
6262                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6263         };
6264         struct nfs4_fs_locations_arg args = {
6265                 .fh             = NFS_FH(inode),
6266                 .page           = page,
6267                 .bitmask        = bitmask,
6268                 .migration      = 1,            /* skip LOOKUP */
6269         };
6270         struct nfs4_fs_locations_res res = {
6271                 .fs_locations   = locations,
6272                 .migration      = 1,
6273         };
6274         struct rpc_message msg = {
6275                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6276                 .rpc_argp       = &args,
6277                 .rpc_resp       = &res,
6278                 .rpc_cred       = cred,
6279         };
6280         int status;
6281
6282         nfs_fattr_init(&locations->fattr);
6283         locations->server = server;
6284         locations->nlocations = 0;
6285
6286         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6287         nfs4_set_sequence_privileged(&args.seq_args);
6288         status = nfs4_call_sync_sequence(clnt, server, &msg,
6289                                         &args.seq_args, &res.seq_res);
6290         if (status == NFS4_OK &&
6291             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6292                 status = -NFS4ERR_LEASE_MOVED;
6293         return status;
6294 }
6295
6296 #endif  /* CONFIG_NFS_V4_1 */
6297
6298 /**
6299  * nfs4_proc_get_locations - discover locations for a migrated FSID
6300  * @inode: inode on FSID that is migrating
6301  * @locations: result of query
6302  * @page: buffer
6303  * @cred: credential to use for this operation
6304  *
6305  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6306  * operation failed, or a negative errno if a local error occurred.
6307  *
6308  * On success, "locations" is filled in, but if the server has
6309  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6310  * asserted.
6311  *
6312  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6313  * from this client that require migration recovery.
6314  */
6315 int nfs4_proc_get_locations(struct inode *inode,
6316                             struct nfs4_fs_locations *locations,
6317                             struct page *page, struct rpc_cred *cred)
6318 {
6319         struct nfs_server *server = NFS_SERVER(inode);
6320         struct nfs_client *clp = server->nfs_client;
6321         const struct nfs4_mig_recovery_ops *ops =
6322                                         clp->cl_mvops->mig_recovery_ops;
6323         struct nfs4_exception exception = { };
6324         int status;
6325
6326         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6327                 (unsigned long long)server->fsid.major,
6328                 (unsigned long long)server->fsid.minor,
6329                 clp->cl_hostname);
6330         nfs_display_fhandle(NFS_FH(inode), __func__);
6331
6332         do {
6333                 status = ops->get_locations(inode, locations, page, cred);
6334                 if (status != -NFS4ERR_DELAY)
6335                         break;
6336                 nfs4_handle_exception(server, status, &exception);
6337         } while (exception.retry);
6338         return status;
6339 }
6340
6341 /*
6342  * This operation also signals the server that this client is
6343  * performing "lease moved" recovery.  The server can stop
6344  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6345  * is appended to this compound to identify the client ID which is
6346  * performing recovery.
6347  */
6348 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6349 {
6350         struct nfs_server *server = NFS_SERVER(inode);
6351         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6352         struct rpc_clnt *clnt = server->client;
6353         struct nfs4_fsid_present_arg args = {
6354                 .fh             = NFS_FH(inode),
6355                 .clientid       = clp->cl_clientid,
6356                 .renew          = 1,            /* append RENEW */
6357         };
6358         struct nfs4_fsid_present_res res = {
6359                 .renew          = 1,
6360         };
6361         struct rpc_message msg = {
6362                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6363                 .rpc_argp       = &args,
6364                 .rpc_resp       = &res,
6365                 .rpc_cred       = cred,
6366         };
6367         unsigned long now = jiffies;
6368         int status;
6369
6370         res.fh = nfs_alloc_fhandle();
6371         if (res.fh == NULL)
6372                 return -ENOMEM;
6373
6374         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6375         nfs4_set_sequence_privileged(&args.seq_args);
6376         status = nfs4_call_sync_sequence(clnt, server, &msg,
6377                                                 &args.seq_args, &res.seq_res);
6378         nfs_free_fhandle(res.fh);
6379         if (status)
6380                 return status;
6381
6382         do_renew_lease(clp, now);
6383         return 0;
6384 }
6385
6386 #ifdef CONFIG_NFS_V4_1
6387
6388 /*
6389  * This operation also signals the server that this client is
6390  * performing "lease moved" recovery.  The server can stop asserting
6391  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6392  * this operation is identified in the SEQUENCE operation in this
6393  * compound.
6394  */
6395 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6396 {
6397         struct nfs_server *server = NFS_SERVER(inode);
6398         struct rpc_clnt *clnt = server->client;
6399         struct nfs4_fsid_present_arg args = {
6400                 .fh             = NFS_FH(inode),
6401         };
6402         struct nfs4_fsid_present_res res = {
6403         };
6404         struct rpc_message msg = {
6405                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6406                 .rpc_argp       = &args,
6407                 .rpc_resp       = &res,
6408                 .rpc_cred       = cred,
6409         };
6410         int status;
6411
6412         res.fh = nfs_alloc_fhandle();
6413         if (res.fh == NULL)
6414                 return -ENOMEM;
6415
6416         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6417         nfs4_set_sequence_privileged(&args.seq_args);
6418         status = nfs4_call_sync_sequence(clnt, server, &msg,
6419                                                 &args.seq_args, &res.seq_res);
6420         nfs_free_fhandle(res.fh);
6421         if (status == NFS4_OK &&
6422             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6423                 status = -NFS4ERR_LEASE_MOVED;
6424         return status;
6425 }
6426
6427 #endif  /* CONFIG_NFS_V4_1 */
6428
6429 /**
6430  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6431  * @inode: inode on FSID to check
6432  * @cred: credential to use for this operation
6433  *
6434  * Server indicates whether the FSID is present, moved, or not
6435  * recognized.  This operation is necessary to clear a LEASE_MOVED
6436  * condition for this client ID.
6437  *
6438  * Returns NFS4_OK if the FSID is present on this server,
6439  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6440  *  NFS4ERR code if some error occurred on the server, or a
6441  *  negative errno if a local failure occurred.
6442  */
6443 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6444 {
6445         struct nfs_server *server = NFS_SERVER(inode);
6446         struct nfs_client *clp = server->nfs_client;
6447         const struct nfs4_mig_recovery_ops *ops =
6448                                         clp->cl_mvops->mig_recovery_ops;
6449         struct nfs4_exception exception = { };
6450         int status;
6451
6452         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6453                 (unsigned long long)server->fsid.major,
6454                 (unsigned long long)server->fsid.minor,
6455                 clp->cl_hostname);
6456         nfs_display_fhandle(NFS_FH(inode), __func__);
6457
6458         do {
6459                 status = ops->fsid_present(inode, cred);
6460                 if (status != -NFS4ERR_DELAY)
6461                         break;
6462                 nfs4_handle_exception(server, status, &exception);
6463         } while (exception.retry);
6464         return status;
6465 }
6466
6467 /**
6468  * If 'use_integrity' is true and the state managment nfs_client
6469  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6470  * and the machine credential as per RFC3530bis and RFC5661 Security
6471  * Considerations sections. Otherwise, just use the user cred with the
6472  * filesystem's rpc_client.
6473  */
6474 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6475 {
6476         int status;
6477         struct nfs4_secinfo_arg args = {
6478                 .dir_fh = NFS_FH(dir),
6479                 .name   = name,
6480         };
6481         struct nfs4_secinfo_res res = {
6482                 .flavors     = flavors,
6483         };
6484         struct rpc_message msg = {
6485                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6486                 .rpc_argp = &args,
6487                 .rpc_resp = &res,
6488         };
6489         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6490         struct rpc_cred *cred = NULL;
6491
6492         if (use_integrity) {
6493                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6494                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6495                 msg.rpc_cred = cred;
6496         }
6497
6498         dprintk("NFS call  secinfo %s\n", name->name);
6499
6500         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6501                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6502
6503         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6504                                 &res.seq_res, 0);
6505         dprintk("NFS reply  secinfo: %d\n", status);
6506
6507         if (cred)
6508                 put_rpccred(cred);
6509
6510         return status;
6511 }
6512
6513 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6514                       struct nfs4_secinfo_flavors *flavors)
6515 {
6516         struct nfs4_exception exception = { };
6517         int err;
6518         do {
6519                 err = -NFS4ERR_WRONGSEC;
6520
6521                 /* try to use integrity protection with machine cred */
6522                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6523                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6524
6525                 /*
6526                  * if unable to use integrity protection, or SECINFO with
6527                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6528                  * disallowed by spec, but exists in deployed servers) use
6529                  * the current filesystem's rpc_client and the user cred.
6530                  */
6531                 if (err == -NFS4ERR_WRONGSEC)
6532                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6533
6534                 trace_nfs4_secinfo(dir, name, err);
6535                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6536                                 &exception);
6537         } while (exception.retry);
6538         return err;
6539 }
6540
6541 #ifdef CONFIG_NFS_V4_1
6542 /*
6543  * Check the exchange flags returned by the server for invalid flags, having
6544  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6545  * DS flags set.
6546  */
6547 static int nfs4_check_cl_exchange_flags(u32 flags)
6548 {
6549         if (flags & ~EXCHGID4_FLAG_MASK_R)
6550                 goto out_inval;
6551         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6552             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6553                 goto out_inval;
6554         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6555                 goto out_inval;
6556         return NFS_OK;
6557 out_inval:
6558         return -NFS4ERR_INVAL;
6559 }
6560
6561 static bool
6562 nfs41_same_server_scope(struct nfs41_server_scope *a,
6563                         struct nfs41_server_scope *b)
6564 {
6565         if (a->server_scope_sz == b->server_scope_sz &&
6566             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6567                 return true;
6568
6569         return false;
6570 }
6571
6572 /*
6573  * nfs4_proc_bind_conn_to_session()
6574  *
6575  * The 4.1 client currently uses the same TCP connection for the
6576  * fore and backchannel.
6577  */
6578 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6579 {
6580         int status;
6581         struct nfs41_bind_conn_to_session_res res;
6582         struct rpc_message msg = {
6583                 .rpc_proc =
6584                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6585                 .rpc_argp = clp,
6586                 .rpc_resp = &res,
6587                 .rpc_cred = cred,
6588         };
6589
6590         dprintk("--> %s\n", __func__);
6591
6592         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6593         if (unlikely(res.session == NULL)) {
6594                 status = -ENOMEM;
6595                 goto out;
6596         }
6597
6598         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6599         trace_nfs4_bind_conn_to_session(clp, status);
6600         if (status == 0) {
6601                 if (memcmp(res.session->sess_id.data,
6602                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6603                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6604                         status = -EIO;
6605                         goto out_session;
6606                 }
6607                 if (res.dir != NFS4_CDFS4_BOTH) {
6608                         dprintk("NFS: %s: Unexpected direction from server\n",
6609                                 __func__);
6610                         status = -EIO;
6611                         goto out_session;
6612                 }
6613                 if (res.use_conn_in_rdma_mode) {
6614                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6615                                 __func__);
6616                         status = -EIO;
6617                         goto out_session;
6618                 }
6619         }
6620 out_session:
6621         kfree(res.session);
6622 out:
6623         dprintk("<-- %s status= %d\n", __func__, status);
6624         return status;
6625 }
6626
6627 /*
6628  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6629  * and operations we'd like to see to enable certain features in the allow map
6630  */
6631 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6632         .how = SP4_MACH_CRED,
6633         .enforce.u.words = {
6634                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6635                       1 << (OP_EXCHANGE_ID - 32) |
6636                       1 << (OP_CREATE_SESSION - 32) |
6637                       1 << (OP_DESTROY_SESSION - 32) |
6638                       1 << (OP_DESTROY_CLIENTID - 32)
6639         },
6640         .allow.u.words = {
6641                 [0] = 1 << (OP_CLOSE) |
6642                       1 << (OP_LOCKU) |
6643                       1 << (OP_COMMIT),
6644                 [1] = 1 << (OP_SECINFO - 32) |
6645                       1 << (OP_SECINFO_NO_NAME - 32) |
6646                       1 << (OP_TEST_STATEID - 32) |
6647                       1 << (OP_FREE_STATEID - 32) |
6648                       1 << (OP_WRITE - 32)
6649         }
6650 };
6651
6652 /*
6653  * Select the state protection mode for client `clp' given the server results
6654  * from exchange_id in `sp'.
6655  *
6656  * Returns 0 on success, negative errno otherwise.
6657  */
6658 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6659                                  struct nfs41_state_protection *sp)
6660 {
6661         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6662                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6663                       1 << (OP_EXCHANGE_ID - 32) |
6664                       1 << (OP_CREATE_SESSION - 32) |
6665                       1 << (OP_DESTROY_SESSION - 32) |
6666                       1 << (OP_DESTROY_CLIENTID - 32)
6667         };
6668         unsigned int i;
6669
6670         if (sp->how == SP4_MACH_CRED) {
6671                 /* Print state protect result */
6672                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6673                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6674                         if (test_bit(i, sp->enforce.u.longs))
6675                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6676                         if (test_bit(i, sp->allow.u.longs))
6677                                 dfprintk(MOUNT, "  allow op %d\n", i);
6678                 }
6679
6680                 /* make sure nothing is on enforce list that isn't supported */
6681                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6682                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6683                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6684                                 return -EINVAL;
6685                         }
6686                 }
6687
6688                 /*
6689                  * Minimal mode - state operations are allowed to use machine
6690                  * credential.  Note this already happens by default, so the
6691                  * client doesn't have to do anything more than the negotiation.
6692                  *
6693                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6694                  *       we're already using the machine cred for exchange_id
6695                  *       and will never use a different cred.
6696                  */
6697                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6698                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6699                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6700                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6701                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6702                         dfprintk(MOUNT, "  minimal mode enabled\n");
6703                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6704                 } else {
6705                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6706                         return -EINVAL;
6707                 }
6708
6709                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6710                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6711                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6712                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6713                 }
6714
6715                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6716                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6717                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6718                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6719                 }
6720
6721                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6722                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6723                         dfprintk(MOUNT, "  stateid mode enabled\n");
6724                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6725                 }
6726
6727                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6728                         dfprintk(MOUNT, "  write mode enabled\n");
6729                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6730                 }
6731
6732                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6733                         dfprintk(MOUNT, "  commit mode enabled\n");
6734                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6735                 }
6736         }
6737
6738         return 0;
6739 }
6740
6741 /*
6742  * _nfs4_proc_exchange_id()
6743  *
6744  * Wrapper for EXCHANGE_ID operation.
6745  */
6746 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6747         u32 sp4_how)
6748 {
6749         nfs4_verifier verifier;
6750         struct nfs41_exchange_id_args args = {
6751                 .verifier = &verifier,
6752                 .client = clp,
6753 #ifdef CONFIG_NFS_V4_1_MIGRATION
6754                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6755                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6756                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6757 #else
6758                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6759                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6760 #endif
6761         };
6762         struct nfs41_exchange_id_res res = {
6763                 0
6764         };
6765         int status;
6766         struct rpc_message msg = {
6767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6768                 .rpc_argp = &args,
6769                 .rpc_resp = &res,
6770                 .rpc_cred = cred,
6771         };
6772
6773         nfs4_init_boot_verifier(clp, &verifier);
6774         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6775                                                         sizeof(args.id));
6776         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6777                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6778                 args.id_len, args.id);
6779
6780         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6781                                         GFP_NOFS);
6782         if (unlikely(res.server_owner == NULL)) {
6783                 status = -ENOMEM;
6784                 goto out;
6785         }
6786
6787         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6788                                         GFP_NOFS);
6789         if (unlikely(res.server_scope == NULL)) {
6790                 status = -ENOMEM;
6791                 goto out_server_owner;
6792         }
6793
6794         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6795         if (unlikely(res.impl_id == NULL)) {
6796                 status = -ENOMEM;
6797                 goto out_server_scope;
6798         }
6799
6800         switch (sp4_how) {
6801         case SP4_NONE:
6802                 args.state_protect.how = SP4_NONE;
6803                 break;
6804
6805         case SP4_MACH_CRED:
6806                 args.state_protect = nfs4_sp4_mach_cred_request;
6807                 break;
6808
6809         default:
6810                 /* unsupported! */
6811                 WARN_ON_ONCE(1);
6812                 status = -EINVAL;
6813                 goto out_server_scope;
6814         }
6815
6816         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6817         trace_nfs4_exchange_id(clp, status);
6818         if (status == 0)
6819                 status = nfs4_check_cl_exchange_flags(res.flags);
6820
6821         if (status == 0)
6822                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6823
6824         if (status == 0) {
6825                 clp->cl_clientid = res.clientid;
6826                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6827                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6828                         clp->cl_seqid = res.seqid;
6829
6830                 kfree(clp->cl_serverowner);
6831                 clp->cl_serverowner = res.server_owner;
6832                 res.server_owner = NULL;
6833
6834                 /* use the most recent implementation id */
6835                 kfree(clp->cl_implid);
6836                 clp->cl_implid = res.impl_id;
6837
6838                 if (clp->cl_serverscope != NULL &&
6839                     !nfs41_same_server_scope(clp->cl_serverscope,
6840                                              res.server_scope)) {
6841                         dprintk("%s: server_scope mismatch detected\n",
6842                                 __func__);
6843                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6844                         kfree(clp->cl_serverscope);
6845                         clp->cl_serverscope = NULL;
6846                 }
6847
6848                 if (clp->cl_serverscope == NULL) {
6849                         clp->cl_serverscope = res.server_scope;
6850                         goto out;
6851                 }
6852         } else
6853                 kfree(res.impl_id);
6854
6855 out_server_owner:
6856         kfree(res.server_owner);
6857 out_server_scope:
6858         kfree(res.server_scope);
6859 out:
6860         if (clp->cl_implid != NULL)
6861                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6862                         "domain: %s, name: %s, date: %llu,%u\n",
6863                         clp->cl_implid->domain, clp->cl_implid->name,
6864                         clp->cl_implid->date.seconds,
6865                         clp->cl_implid->date.nseconds);
6866         dprintk("NFS reply exchange_id: %d\n", status);
6867         return status;
6868 }
6869
6870 /*
6871  * nfs4_proc_exchange_id()
6872  *
6873  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6874  *
6875  * Since the clientid has expired, all compounds using sessions
6876  * associated with the stale clientid will be returning
6877  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6878  * be in some phase of session reset.
6879  *
6880  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6881  */
6882 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6883 {
6884         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6885         int status;
6886
6887         /* try SP4_MACH_CRED if krb5i/p */
6888         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6889             authflavor == RPC_AUTH_GSS_KRB5P) {
6890                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6891                 if (!status)
6892                         return 0;
6893         }
6894
6895         /* try SP4_NONE */
6896         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6897 }
6898
6899 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6900                 struct rpc_cred *cred)
6901 {
6902         struct rpc_message msg = {
6903                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6904                 .rpc_argp = clp,
6905                 .rpc_cred = cred,
6906         };
6907         int status;
6908
6909         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6910         trace_nfs4_destroy_clientid(clp, status);
6911         if (status)
6912                 dprintk("NFS: Got error %d from the server %s on "
6913                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6914         return status;
6915 }
6916
6917 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6918                 struct rpc_cred *cred)
6919 {
6920         unsigned int loop;
6921         int ret;
6922
6923         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6924                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6925                 switch (ret) {
6926                 case -NFS4ERR_DELAY:
6927                 case -NFS4ERR_CLIENTID_BUSY:
6928                         ssleep(1);
6929                         break;
6930                 default:
6931                         return ret;
6932                 }
6933         }
6934         return 0;
6935 }
6936
6937 int nfs4_destroy_clientid(struct nfs_client *clp)
6938 {
6939         struct rpc_cred *cred;
6940         int ret = 0;
6941
6942         if (clp->cl_mvops->minor_version < 1)
6943                 goto out;
6944         if (clp->cl_exchange_flags == 0)
6945                 goto out;
6946         if (clp->cl_preserve_clid)
6947                 goto out;
6948         cred = nfs4_get_clid_cred(clp);
6949         ret = nfs4_proc_destroy_clientid(clp, cred);
6950         if (cred)
6951                 put_rpccred(cred);
6952         switch (ret) {
6953         case 0:
6954         case -NFS4ERR_STALE_CLIENTID:
6955                 clp->cl_exchange_flags = 0;
6956         }
6957 out:
6958         return ret;
6959 }
6960
6961 struct nfs4_get_lease_time_data {
6962         struct nfs4_get_lease_time_args *args;
6963         struct nfs4_get_lease_time_res *res;
6964         struct nfs_client *clp;
6965 };
6966
6967 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6968                                         void *calldata)
6969 {
6970         struct nfs4_get_lease_time_data *data =
6971                         (struct nfs4_get_lease_time_data *)calldata;
6972
6973         dprintk("--> %s\n", __func__);
6974         /* just setup sequence, do not trigger session recovery
6975            since we're invoked within one */
6976         nfs41_setup_sequence(data->clp->cl_session,
6977                         &data->args->la_seq_args,
6978                         &data->res->lr_seq_res,
6979                         task);
6980         dprintk("<-- %s\n", __func__);
6981 }
6982
6983 /*
6984  * Called from nfs4_state_manager thread for session setup, so don't recover
6985  * from sequence operation or clientid errors.
6986  */
6987 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6988 {
6989         struct nfs4_get_lease_time_data *data =
6990                         (struct nfs4_get_lease_time_data *)calldata;
6991
6992         dprintk("--> %s\n", __func__);
6993         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6994                 return;
6995         switch (task->tk_status) {
6996         case -NFS4ERR_DELAY:
6997         case -NFS4ERR_GRACE:
6998                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6999                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7000                 task->tk_status = 0;
7001                 /* fall through */
7002         case -NFS4ERR_RETRY_UNCACHED_REP:
7003                 rpc_restart_call_prepare(task);
7004                 return;
7005         }
7006         dprintk("<-- %s\n", __func__);
7007 }
7008
7009 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7010         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7011         .rpc_call_done = nfs4_get_lease_time_done,
7012 };
7013
7014 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7015 {
7016         struct rpc_task *task;
7017         struct nfs4_get_lease_time_args args;
7018         struct nfs4_get_lease_time_res res = {
7019                 .lr_fsinfo = fsinfo,
7020         };
7021         struct nfs4_get_lease_time_data data = {
7022                 .args = &args,
7023                 .res = &res,
7024                 .clp = clp,
7025         };
7026         struct rpc_message msg = {
7027                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7028                 .rpc_argp = &args,
7029                 .rpc_resp = &res,
7030         };
7031         struct rpc_task_setup task_setup = {
7032                 .rpc_client = clp->cl_rpcclient,
7033                 .rpc_message = &msg,
7034                 .callback_ops = &nfs4_get_lease_time_ops,
7035                 .callback_data = &data,
7036                 .flags = RPC_TASK_TIMEOUT,
7037         };
7038         int status;
7039
7040         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7041         nfs4_set_sequence_privileged(&args.la_seq_args);
7042         dprintk("--> %s\n", __func__);
7043         task = rpc_run_task(&task_setup);
7044
7045         if (IS_ERR(task))
7046                 status = PTR_ERR(task);
7047         else {
7048                 status = task->tk_status;
7049                 rpc_put_task(task);
7050         }
7051         dprintk("<-- %s return %d\n", __func__, status);
7052
7053         return status;
7054 }
7055
7056 /*
7057  * Initialize the values to be used by the client in CREATE_SESSION
7058  * If nfs4_init_session set the fore channel request and response sizes,
7059  * use them.
7060  *
7061  * Set the back channel max_resp_sz_cached to zero to force the client to
7062  * always set csa_cachethis to FALSE because the current implementation
7063  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7064  */
7065 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7066 {
7067         unsigned int max_rqst_sz, max_resp_sz;
7068
7069         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7070         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7071
7072         /* Fore channel attributes */
7073         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7074         args->fc_attrs.max_resp_sz = max_resp_sz;
7075         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7076         args->fc_attrs.max_reqs = max_session_slots;
7077
7078         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7079                 "max_ops=%u max_reqs=%u\n",
7080                 __func__,
7081                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7082                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7083
7084         /* Back channel attributes */
7085         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7086         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7087         args->bc_attrs.max_resp_sz_cached = 0;
7088         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7089         args->bc_attrs.max_reqs = 1;
7090
7091         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7092                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7093                 __func__,
7094                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7095                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7096                 args->bc_attrs.max_reqs);
7097 }
7098
7099 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7100 {
7101         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7102         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7103
7104         if (rcvd->max_resp_sz > sent->max_resp_sz)
7105                 return -EINVAL;
7106         /*
7107          * Our requested max_ops is the minimum we need; we're not
7108          * prepared to break up compounds into smaller pieces than that.
7109          * So, no point even trying to continue if the server won't
7110          * cooperate:
7111          */
7112         if (rcvd->max_ops < sent->max_ops)
7113                 return -EINVAL;
7114         if (rcvd->max_reqs == 0)
7115                 return -EINVAL;
7116         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7117                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7118         return 0;
7119 }
7120
7121 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7122 {
7123         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7124         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7125
7126         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7127                 return -EINVAL;
7128         if (rcvd->max_resp_sz < sent->max_resp_sz)
7129                 return -EINVAL;
7130         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7131                 return -EINVAL;
7132         /* These would render the backchannel useless: */
7133         if (rcvd->max_ops != sent->max_ops)
7134                 return -EINVAL;
7135         if (rcvd->max_reqs != sent->max_reqs)
7136                 return -EINVAL;
7137         return 0;
7138 }
7139
7140 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7141                                      struct nfs4_session *session)
7142 {
7143         int ret;
7144
7145         ret = nfs4_verify_fore_channel_attrs(args, session);
7146         if (ret)
7147                 return ret;
7148         return nfs4_verify_back_channel_attrs(args, session);
7149 }
7150
7151 static int _nfs4_proc_create_session(struct nfs_client *clp,
7152                 struct rpc_cred *cred)
7153 {
7154         struct nfs4_session *session = clp->cl_session;
7155         struct nfs41_create_session_args args = {
7156                 .client = clp,
7157                 .cb_program = NFS4_CALLBACK,
7158         };
7159         struct nfs41_create_session_res res = {
7160                 .client = clp,
7161         };
7162         struct rpc_message msg = {
7163                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7164                 .rpc_argp = &args,
7165                 .rpc_resp = &res,
7166                 .rpc_cred = cred,
7167         };
7168         int status;
7169
7170         nfs4_init_channel_attrs(&args);
7171         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7172
7173         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7174         trace_nfs4_create_session(clp, status);
7175
7176         if (!status) {
7177                 /* Verify the session's negotiated channel_attrs values */
7178                 status = nfs4_verify_channel_attrs(&args, session);
7179                 /* Increment the clientid slot sequence id */
7180                 clp->cl_seqid++;
7181         }
7182
7183         return status;
7184 }
7185
7186 /*
7187  * Issues a CREATE_SESSION operation to the server.
7188  * It is the responsibility of the caller to verify the session is
7189  * expired before calling this routine.
7190  */
7191 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7192 {
7193         int status;
7194         unsigned *ptr;
7195         struct nfs4_session *session = clp->cl_session;
7196
7197         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7198
7199         status = _nfs4_proc_create_session(clp, cred);
7200         if (status)
7201                 goto out;
7202
7203         /* Init or reset the session slot tables */
7204         status = nfs4_setup_session_slot_tables(session);
7205         dprintk("slot table setup returned %d\n", status);
7206         if (status)
7207                 goto out;
7208
7209         ptr = (unsigned *)&session->sess_id.data[0];
7210         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7211                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7212 out:
7213         dprintk("<-- %s\n", __func__);
7214         return status;
7215 }
7216
7217 /*
7218  * Issue the over-the-wire RPC DESTROY_SESSION.
7219  * The caller must serialize access to this routine.
7220  */
7221 int nfs4_proc_destroy_session(struct nfs4_session *session,
7222                 struct rpc_cred *cred)
7223 {
7224         struct rpc_message msg = {
7225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7226                 .rpc_argp = session,
7227                 .rpc_cred = cred,
7228         };
7229         int status = 0;
7230
7231         dprintk("--> nfs4_proc_destroy_session\n");
7232
7233         /* session is still being setup */
7234         if (session->clp->cl_cons_state != NFS_CS_READY)
7235                 return status;
7236
7237         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7238         trace_nfs4_destroy_session(session->clp, status);
7239
7240         if (status)
7241                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7242                         "Session has been destroyed regardless...\n", status);
7243
7244         dprintk("<-- nfs4_proc_destroy_session\n");
7245         return status;
7246 }
7247
7248 /*
7249  * Renew the cl_session lease.
7250  */
7251 struct nfs4_sequence_data {
7252         struct nfs_client *clp;
7253         struct nfs4_sequence_args args;
7254         struct nfs4_sequence_res res;
7255 };
7256
7257 static void nfs41_sequence_release(void *data)
7258 {
7259         struct nfs4_sequence_data *calldata = data;
7260         struct nfs_client *clp = calldata->clp;
7261
7262         if (atomic_read(&clp->cl_count) > 1)
7263                 nfs4_schedule_state_renewal(clp);
7264         nfs_put_client(clp);
7265         kfree(calldata);
7266 }
7267
7268 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7269 {
7270         switch(task->tk_status) {
7271         case -NFS4ERR_DELAY:
7272                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7273                 return -EAGAIN;
7274         default:
7275                 nfs4_schedule_lease_recovery(clp);
7276         }
7277         return 0;
7278 }
7279
7280 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7281 {
7282         struct nfs4_sequence_data *calldata = data;
7283         struct nfs_client *clp = calldata->clp;
7284
7285         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7286                 return;
7287
7288         trace_nfs4_sequence(clp, task->tk_status);
7289         if (task->tk_status < 0) {
7290                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7291                 if (atomic_read(&clp->cl_count) == 1)
7292                         goto out;
7293
7294                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7295                         rpc_restart_call_prepare(task);
7296                         return;
7297                 }
7298         }
7299         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7300 out:
7301         dprintk("<-- %s\n", __func__);
7302 }
7303
7304 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7305 {
7306         struct nfs4_sequence_data *calldata = data;
7307         struct nfs_client *clp = calldata->clp;
7308         struct nfs4_sequence_args *args;
7309         struct nfs4_sequence_res *res;
7310
7311         args = task->tk_msg.rpc_argp;
7312         res = task->tk_msg.rpc_resp;
7313
7314         nfs41_setup_sequence(clp->cl_session, args, res, task);
7315 }
7316
7317 static const struct rpc_call_ops nfs41_sequence_ops = {
7318         .rpc_call_done = nfs41_sequence_call_done,
7319         .rpc_call_prepare = nfs41_sequence_prepare,
7320         .rpc_release = nfs41_sequence_release,
7321 };
7322
7323 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7324                 struct rpc_cred *cred,
7325                 bool is_privileged)
7326 {
7327         struct nfs4_sequence_data *calldata;
7328         struct rpc_message msg = {
7329                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7330                 .rpc_cred = cred,
7331         };
7332         struct rpc_task_setup task_setup_data = {
7333                 .rpc_client = clp->cl_rpcclient,
7334                 .rpc_message = &msg,
7335                 .callback_ops = &nfs41_sequence_ops,
7336                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7337         };
7338
7339         if (!atomic_inc_not_zero(&clp->cl_count))
7340                 return ERR_PTR(-EIO);
7341         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7342         if (calldata == NULL) {
7343                 nfs_put_client(clp);
7344                 return ERR_PTR(-ENOMEM);
7345         }
7346         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7347         if (is_privileged)
7348                 nfs4_set_sequence_privileged(&calldata->args);
7349         msg.rpc_argp = &calldata->args;
7350         msg.rpc_resp = &calldata->res;
7351         calldata->clp = clp;
7352         task_setup_data.callback_data = calldata;
7353
7354         return rpc_run_task(&task_setup_data);
7355 }
7356
7357 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7358 {
7359         struct rpc_task *task;
7360         int ret = 0;
7361
7362         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7363                 return -EAGAIN;
7364         task = _nfs41_proc_sequence(clp, cred, false);
7365         if (IS_ERR(task))
7366                 ret = PTR_ERR(task);
7367         else
7368                 rpc_put_task_async(task);
7369         dprintk("<-- %s status=%d\n", __func__, ret);
7370         return ret;
7371 }
7372
7373 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7374 {
7375         struct rpc_task *task;
7376         int ret;
7377
7378         task = _nfs41_proc_sequence(clp, cred, true);
7379         if (IS_ERR(task)) {
7380                 ret = PTR_ERR(task);
7381                 goto out;
7382         }
7383         ret = rpc_wait_for_completion_task(task);
7384         if (!ret) {
7385                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7386
7387                 if (task->tk_status == 0)
7388                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7389                 ret = task->tk_status;
7390         }
7391         rpc_put_task(task);
7392 out:
7393         dprintk("<-- %s status=%d\n", __func__, ret);
7394         return ret;
7395 }
7396
7397 struct nfs4_reclaim_complete_data {
7398         struct nfs_client *clp;
7399         struct nfs41_reclaim_complete_args arg;
7400         struct nfs41_reclaim_complete_res res;
7401 };
7402
7403 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7404 {
7405         struct nfs4_reclaim_complete_data *calldata = data;
7406
7407         nfs41_setup_sequence(calldata->clp->cl_session,
7408                         &calldata->arg.seq_args,
7409                         &calldata->res.seq_res,
7410                         task);
7411 }
7412
7413 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7414 {
7415         switch(task->tk_status) {
7416         case 0:
7417         case -NFS4ERR_COMPLETE_ALREADY:
7418         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7419                 break;
7420         case -NFS4ERR_DELAY:
7421                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7422                 /* fall through */
7423         case -NFS4ERR_RETRY_UNCACHED_REP:
7424                 return -EAGAIN;
7425         default:
7426                 nfs4_schedule_lease_recovery(clp);
7427         }
7428         return 0;
7429 }
7430
7431 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7432 {
7433         struct nfs4_reclaim_complete_data *calldata = data;
7434         struct nfs_client *clp = calldata->clp;
7435         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7436
7437         dprintk("--> %s\n", __func__);
7438         if (!nfs41_sequence_done(task, res))
7439                 return;
7440
7441         trace_nfs4_reclaim_complete(clp, task->tk_status);
7442         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7443                 rpc_restart_call_prepare(task);
7444                 return;
7445         }
7446         dprintk("<-- %s\n", __func__);
7447 }
7448
7449 static void nfs4_free_reclaim_complete_data(void *data)
7450 {
7451         struct nfs4_reclaim_complete_data *calldata = data;
7452
7453         kfree(calldata);
7454 }
7455
7456 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7457         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7458         .rpc_call_done = nfs4_reclaim_complete_done,
7459         .rpc_release = nfs4_free_reclaim_complete_data,
7460 };
7461
7462 /*
7463  * Issue a global reclaim complete.
7464  */
7465 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7466                 struct rpc_cred *cred)
7467 {
7468         struct nfs4_reclaim_complete_data *calldata;
7469         struct rpc_task *task;
7470         struct rpc_message msg = {
7471                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7472                 .rpc_cred = cred,
7473         };
7474         struct rpc_task_setup task_setup_data = {
7475                 .rpc_client = clp->cl_rpcclient,
7476                 .rpc_message = &msg,
7477                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7478                 .flags = RPC_TASK_ASYNC,
7479         };
7480         int status = -ENOMEM;
7481
7482         dprintk("--> %s\n", __func__);
7483         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7484         if (calldata == NULL)
7485                 goto out;
7486         calldata->clp = clp;
7487         calldata->arg.one_fs = 0;
7488
7489         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7490         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7491         msg.rpc_argp = &calldata->arg;
7492         msg.rpc_resp = &calldata->res;
7493         task_setup_data.callback_data = calldata;
7494         task = rpc_run_task(&task_setup_data);
7495         if (IS_ERR(task)) {
7496                 status = PTR_ERR(task);
7497                 goto out;
7498         }
7499         status = nfs4_wait_for_completion_rpc_task(task);
7500         if (status == 0)
7501                 status = task->tk_status;
7502         rpc_put_task(task);
7503         return 0;
7504 out:
7505         dprintk("<-- %s status=%d\n", __func__, status);
7506         return status;
7507 }
7508
7509 static void
7510 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7511 {
7512         struct nfs4_layoutget *lgp = calldata;
7513         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7514         struct nfs4_session *session = nfs4_get_session(server);
7515
7516         dprintk("--> %s\n", __func__);
7517         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7518          * right now covering the LAYOUTGET we are about to send.
7519          * However, that is not so catastrophic, and there seems
7520          * to be no way to prevent it completely.
7521          */
7522         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7523                                 &lgp->res.seq_res, task))
7524                 return;
7525         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7526                                           NFS_I(lgp->args.inode)->layout,
7527                                           lgp->args.ctx->state)) {
7528                 rpc_exit(task, NFS4_OK);
7529         }
7530 }
7531
7532 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7533 {
7534         struct nfs4_layoutget *lgp = calldata;
7535         struct inode *inode = lgp->args.inode;
7536         struct nfs_server *server = NFS_SERVER(inode);
7537         struct pnfs_layout_hdr *lo;
7538         struct nfs4_state *state = NULL;
7539         unsigned long timeo, now, giveup;
7540
7541         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7542
7543         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7544                 goto out;
7545
7546         switch (task->tk_status) {
7547         case 0:
7548                 goto out;
7549         /*
7550          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7551          * (or clients) writing to the same RAID stripe
7552          */
7553         case -NFS4ERR_LAYOUTTRYLATER:
7554         /*
7555          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7556          * existing layout before getting a new one).
7557          */
7558         case -NFS4ERR_RECALLCONFLICT:
7559                 timeo = rpc_get_timeout(task->tk_client);
7560                 giveup = lgp->args.timestamp + timeo;
7561                 now = jiffies;
7562                 if (time_after(giveup, now)) {
7563                         unsigned long delay;
7564
7565                         /* Delay for:
7566                          * - Not less then NFS4_POLL_RETRY_MIN.
7567                          * - One last time a jiffie before we give up
7568                          * - exponential backoff (time_now minus start_attempt)
7569                          */
7570                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7571                                     min((giveup - now - 1),
7572                                         now - lgp->args.timestamp));
7573
7574                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7575                                 __func__, delay);
7576                         rpc_delay(task, delay);
7577                         task->tk_status = 0;
7578                         rpc_restart_call_prepare(task);
7579                         goto out; /* Do not call nfs4_async_handle_error() */
7580                 }
7581                 break;
7582         case -NFS4ERR_EXPIRED:
7583         case -NFS4ERR_BAD_STATEID:
7584                 spin_lock(&inode->i_lock);
7585                 lo = NFS_I(inode)->layout;
7586                 if (!lo || list_empty(&lo->plh_segs)) {
7587                         spin_unlock(&inode->i_lock);
7588                         /* If the open stateid was bad, then recover it. */
7589                         state = lgp->args.ctx->state;
7590                 } else {
7591                         LIST_HEAD(head);
7592
7593                         /*
7594                          * Mark the bad layout state as invalid, then retry
7595                          * with the current stateid.
7596                          */
7597                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7598                         spin_unlock(&inode->i_lock);
7599                         pnfs_free_lseg_list(&head);
7600
7601                         task->tk_status = 0;
7602                         rpc_restart_call_prepare(task);
7603                 }
7604         }
7605         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7606                 rpc_restart_call_prepare(task);
7607 out:
7608         dprintk("<-- %s\n", __func__);
7609 }
7610
7611 static size_t max_response_pages(struct nfs_server *server)
7612 {
7613         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7614         return nfs_page_array_len(0, max_resp_sz);
7615 }
7616
7617 static void nfs4_free_pages(struct page **pages, size_t size)
7618 {
7619         int i;
7620
7621         if (!pages)
7622                 return;
7623
7624         for (i = 0; i < size; i++) {
7625                 if (!pages[i])
7626                         break;
7627                 __free_page(pages[i]);
7628         }
7629         kfree(pages);
7630 }
7631
7632 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7633 {
7634         struct page **pages;
7635         int i;
7636
7637         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7638         if (!pages) {
7639                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7640                 return NULL;
7641         }
7642
7643         for (i = 0; i < size; i++) {
7644                 pages[i] = alloc_page(gfp_flags);
7645                 if (!pages[i]) {
7646                         dprintk("%s: failed to allocate page\n", __func__);
7647                         nfs4_free_pages(pages, size);
7648                         return NULL;
7649                 }
7650         }
7651
7652         return pages;
7653 }
7654
7655 static void nfs4_layoutget_release(void *calldata)
7656 {
7657         struct nfs4_layoutget *lgp = calldata;
7658         struct inode *inode = lgp->args.inode;
7659         struct nfs_server *server = NFS_SERVER(inode);
7660         size_t max_pages = max_response_pages(server);
7661
7662         dprintk("--> %s\n", __func__);
7663         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7664         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7665         put_nfs_open_context(lgp->args.ctx);
7666         kfree(calldata);
7667         dprintk("<-- %s\n", __func__);
7668 }
7669
7670 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7671         .rpc_call_prepare = nfs4_layoutget_prepare,
7672         .rpc_call_done = nfs4_layoutget_done,
7673         .rpc_release = nfs4_layoutget_release,
7674 };
7675
7676 struct pnfs_layout_segment *
7677 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7678 {
7679         struct inode *inode = lgp->args.inode;
7680         struct nfs_server *server = NFS_SERVER(inode);
7681         size_t max_pages = max_response_pages(server);
7682         struct rpc_task *task;
7683         struct rpc_message msg = {
7684                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7685                 .rpc_argp = &lgp->args,
7686                 .rpc_resp = &lgp->res,
7687                 .rpc_cred = lgp->cred,
7688         };
7689         struct rpc_task_setup task_setup_data = {
7690                 .rpc_client = server->client,
7691                 .rpc_message = &msg,
7692                 .callback_ops = &nfs4_layoutget_call_ops,
7693                 .callback_data = lgp,
7694                 .flags = RPC_TASK_ASYNC,
7695         };
7696         struct pnfs_layout_segment *lseg = NULL;
7697         int status = 0;
7698
7699         dprintk("--> %s\n", __func__);
7700
7701         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7702         if (!lgp->args.layout.pages) {
7703                 nfs4_layoutget_release(lgp);
7704                 return ERR_PTR(-ENOMEM);
7705         }
7706         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7707         lgp->args.timestamp = jiffies;
7708
7709         lgp->res.layoutp = &lgp->args.layout;
7710         lgp->res.seq_res.sr_slot = NULL;
7711         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7712
7713         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7714         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7715
7716         task = rpc_run_task(&task_setup_data);
7717         if (IS_ERR(task))
7718                 return ERR_CAST(task);
7719         status = nfs4_wait_for_completion_rpc_task(task);
7720         if (status == 0)
7721                 status = task->tk_status;
7722         trace_nfs4_layoutget(lgp->args.ctx,
7723                         &lgp->args.range,
7724                         &lgp->res.range,
7725                         status);
7726         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7727         if (status == 0 && lgp->res.layoutp->len)
7728                 lseg = pnfs_layout_process(lgp);
7729         rpc_put_task(task);
7730         dprintk("<-- %s status=%d\n", __func__, status);
7731         if (status)
7732                 return ERR_PTR(status);
7733         return lseg;
7734 }
7735
7736 static void
7737 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7738 {
7739         struct nfs4_layoutreturn *lrp = calldata;
7740
7741         dprintk("--> %s\n", __func__);
7742         nfs41_setup_sequence(lrp->clp->cl_session,
7743                         &lrp->args.seq_args,
7744                         &lrp->res.seq_res,
7745                         task);
7746 }
7747
7748 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7749 {
7750         struct nfs4_layoutreturn *lrp = calldata;
7751         struct nfs_server *server;
7752
7753         dprintk("--> %s\n", __func__);
7754
7755         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7756                 return;
7757
7758         server = NFS_SERVER(lrp->args.inode);
7759         switch (task->tk_status) {
7760         default:
7761                 task->tk_status = 0;
7762         case 0:
7763                 break;
7764         case -NFS4ERR_DELAY:
7765                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7766                         break;
7767                 rpc_restart_call_prepare(task);
7768                 return;
7769         }
7770         dprintk("<-- %s\n", __func__);
7771 }
7772
7773 static void nfs4_layoutreturn_release(void *calldata)
7774 {
7775         struct nfs4_layoutreturn *lrp = calldata;
7776         struct pnfs_layout_hdr *lo = lrp->args.layout;
7777
7778         dprintk("--> %s\n", __func__);
7779         spin_lock(&lo->plh_inode->i_lock);
7780         if (lrp->res.lrs_present)
7781                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7782         lo->plh_block_lgets--;
7783         spin_unlock(&lo->plh_inode->i_lock);
7784         pnfs_put_layout_hdr(lrp->args.layout);
7785         kfree(calldata);
7786         dprintk("<-- %s\n", __func__);
7787 }
7788
7789 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7790         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7791         .rpc_call_done = nfs4_layoutreturn_done,
7792         .rpc_release = nfs4_layoutreturn_release,
7793 };
7794
7795 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7796 {
7797         struct rpc_task *task;
7798         struct rpc_message msg = {
7799                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7800                 .rpc_argp = &lrp->args,
7801                 .rpc_resp = &lrp->res,
7802                 .rpc_cred = lrp->cred,
7803         };
7804         struct rpc_task_setup task_setup_data = {
7805                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7806                 .rpc_message = &msg,
7807                 .callback_ops = &nfs4_layoutreturn_call_ops,
7808                 .callback_data = lrp,
7809         };
7810         int status;
7811
7812         dprintk("--> %s\n", __func__);
7813         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7814         task = rpc_run_task(&task_setup_data);
7815         if (IS_ERR(task))
7816                 return PTR_ERR(task);
7817         status = task->tk_status;
7818         trace_nfs4_layoutreturn(lrp->args.inode, status);
7819         dprintk("<-- %s status=%d\n", __func__, status);
7820         rpc_put_task(task);
7821         return status;
7822 }
7823
7824 static int
7825 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7826                 struct pnfs_device *pdev,
7827                 struct rpc_cred *cred)
7828 {
7829         struct nfs4_getdeviceinfo_args args = {
7830                 .pdev = pdev,
7831         };
7832         struct nfs4_getdeviceinfo_res res = {
7833                 .pdev = pdev,
7834         };
7835         struct rpc_message msg = {
7836                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7837                 .rpc_argp = &args,
7838                 .rpc_resp = &res,
7839                 .rpc_cred = cred,
7840         };
7841         int status;
7842
7843         dprintk("--> %s\n", __func__);
7844         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7845         dprintk("<-- %s status=%d\n", __func__, status);
7846
7847         return status;
7848 }
7849
7850 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7851                 struct pnfs_device *pdev,
7852                 struct rpc_cred *cred)
7853 {
7854         struct nfs4_exception exception = { };
7855         int err;
7856
7857         do {
7858                 err = nfs4_handle_exception(server,
7859                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7860                                         &exception);
7861         } while (exception.retry);
7862         return err;
7863 }
7864 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7865
7866 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7867 {
7868         struct nfs4_layoutcommit_data *data = calldata;
7869         struct nfs_server *server = NFS_SERVER(data->args.inode);
7870         struct nfs4_session *session = nfs4_get_session(server);
7871
7872         nfs41_setup_sequence(session,
7873                         &data->args.seq_args,
7874                         &data->res.seq_res,
7875                         task);
7876 }
7877
7878 static void
7879 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7880 {
7881         struct nfs4_layoutcommit_data *data = calldata;
7882         struct nfs_server *server = NFS_SERVER(data->args.inode);
7883
7884         if (!nfs41_sequence_done(task, &data->res.seq_res))
7885                 return;
7886
7887         switch (task->tk_status) { /* Just ignore these failures */
7888         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7889         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7890         case -NFS4ERR_BADLAYOUT:     /* no layout */
7891         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7892                 task->tk_status = 0;
7893         case 0:
7894                 break;
7895         default:
7896                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7897                         rpc_restart_call_prepare(task);
7898                         return;
7899                 }
7900         }
7901 }
7902
7903 static void nfs4_layoutcommit_release(void *calldata)
7904 {
7905         struct nfs4_layoutcommit_data *data = calldata;
7906
7907         pnfs_cleanup_layoutcommit(data);
7908         nfs_post_op_update_inode_force_wcc(data->args.inode,
7909                                            data->res.fattr);
7910         put_rpccred(data->cred);
7911         kfree(data);
7912 }
7913
7914 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7915         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7916         .rpc_call_done = nfs4_layoutcommit_done,
7917         .rpc_release = nfs4_layoutcommit_release,
7918 };
7919
7920 int
7921 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7922 {
7923         struct rpc_message msg = {
7924                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7925                 .rpc_argp = &data->args,
7926                 .rpc_resp = &data->res,
7927                 .rpc_cred = data->cred,
7928         };
7929         struct rpc_task_setup task_setup_data = {
7930                 .task = &data->task,
7931                 .rpc_client = NFS_CLIENT(data->args.inode),
7932                 .rpc_message = &msg,
7933                 .callback_ops = &nfs4_layoutcommit_ops,
7934                 .callback_data = data,
7935                 .flags = RPC_TASK_ASYNC,
7936         };
7937         struct rpc_task *task;
7938         int status = 0;
7939
7940         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7941                 "lbw: %llu inode %lu\n",
7942                 data->task.tk_pid, sync,
7943                 data->args.lastbytewritten,
7944                 data->args.inode->i_ino);
7945
7946         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7947         task = rpc_run_task(&task_setup_data);
7948         if (IS_ERR(task))
7949                 return PTR_ERR(task);
7950         if (sync == false)
7951                 goto out;
7952         status = nfs4_wait_for_completion_rpc_task(task);
7953         if (status != 0)
7954                 goto out;
7955         status = task->tk_status;
7956         trace_nfs4_layoutcommit(data->args.inode, status);
7957 out:
7958         dprintk("%s: status %d\n", __func__, status);
7959         rpc_put_task(task);
7960         return status;
7961 }
7962
7963 /**
7964  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7965  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7966  */
7967 static int
7968 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7969                     struct nfs_fsinfo *info,
7970                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7971 {
7972         struct nfs41_secinfo_no_name_args args = {
7973                 .style = SECINFO_STYLE_CURRENT_FH,
7974         };
7975         struct nfs4_secinfo_res res = {
7976                 .flavors = flavors,
7977         };
7978         struct rpc_message msg = {
7979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7980                 .rpc_argp = &args,
7981                 .rpc_resp = &res,
7982         };
7983         struct rpc_clnt *clnt = server->client;
7984         struct rpc_cred *cred = NULL;
7985         int status;
7986
7987         if (use_integrity) {
7988                 clnt = server->nfs_client->cl_rpcclient;
7989                 cred = nfs4_get_clid_cred(server->nfs_client);
7990                 msg.rpc_cred = cred;
7991         }
7992
7993         dprintk("--> %s\n", __func__);
7994         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7995                                 &res.seq_res, 0);
7996         dprintk("<-- %s status=%d\n", __func__, status);
7997
7998         if (cred)
7999                 put_rpccred(cred);
8000
8001         return status;
8002 }
8003
8004 static int
8005 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8006                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8007 {
8008         struct nfs4_exception exception = { };
8009         int err;
8010         do {
8011                 /* first try using integrity protection */
8012                 err = -NFS4ERR_WRONGSEC;
8013
8014                 /* try to use integrity protection with machine cred */
8015                 if (_nfs4_is_integrity_protected(server->nfs_client))
8016                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8017                                                           flavors, true);
8018
8019                 /*
8020                  * if unable to use integrity protection, or SECINFO with
8021                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8022                  * disallowed by spec, but exists in deployed servers) use
8023                  * the current filesystem's rpc_client and the user cred.
8024                  */
8025                 if (err == -NFS4ERR_WRONGSEC)
8026                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8027                                                           flavors, false);
8028
8029                 switch (err) {
8030                 case 0:
8031                 case -NFS4ERR_WRONGSEC:
8032                 case -ENOTSUPP:
8033                         goto out;
8034                 default:
8035                         err = nfs4_handle_exception(server, err, &exception);
8036                 }
8037         } while (exception.retry);
8038 out:
8039         return err;
8040 }
8041
8042 static int
8043 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8044                     struct nfs_fsinfo *info)
8045 {
8046         int err;
8047         struct page *page;
8048         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8049         struct nfs4_secinfo_flavors *flavors;
8050         struct nfs4_secinfo4 *secinfo;
8051         int i;
8052
8053         page = alloc_page(GFP_KERNEL);
8054         if (!page) {
8055                 err = -ENOMEM;
8056                 goto out;
8057         }
8058
8059         flavors = page_address(page);
8060         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8061
8062         /*
8063          * Fall back on "guess and check" method if
8064          * the server doesn't support SECINFO_NO_NAME
8065          */
8066         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8067                 err = nfs4_find_root_sec(server, fhandle, info);
8068                 goto out_freepage;
8069         }
8070         if (err)
8071                 goto out_freepage;
8072
8073         for (i = 0; i < flavors->num_flavors; i++) {
8074                 secinfo = &flavors->flavors[i];
8075
8076                 switch (secinfo->flavor) {
8077                 case RPC_AUTH_NULL:
8078                 case RPC_AUTH_UNIX:
8079                 case RPC_AUTH_GSS:
8080                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8081                                         &secinfo->flavor_info);
8082                         break;
8083                 default:
8084                         flavor = RPC_AUTH_MAXFLAVOR;
8085                         break;
8086                 }
8087
8088                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8089                         flavor = RPC_AUTH_MAXFLAVOR;
8090
8091                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8092                         err = nfs4_lookup_root_sec(server, fhandle,
8093                                                    info, flavor);
8094                         if (!err)
8095                                 break;
8096                 }
8097         }
8098
8099         if (flavor == RPC_AUTH_MAXFLAVOR)
8100                 err = -EPERM;
8101
8102 out_freepage:
8103         put_page(page);
8104         if (err == -EACCES)
8105                 return -EPERM;
8106 out:
8107         return err;
8108 }
8109
8110 static int _nfs41_test_stateid(struct nfs_server *server,
8111                 nfs4_stateid *stateid,
8112                 struct rpc_cred *cred)
8113 {
8114         int status;
8115         struct nfs41_test_stateid_args args = {
8116                 .stateid = stateid,
8117         };
8118         struct nfs41_test_stateid_res res;
8119         struct rpc_message msg = {
8120                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8121                 .rpc_argp = &args,
8122                 .rpc_resp = &res,
8123                 .rpc_cred = cred,
8124         };
8125         struct rpc_clnt *rpc_client = server->client;
8126
8127         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8128                 &rpc_client, &msg);
8129
8130         dprintk("NFS call  test_stateid %p\n", stateid);
8131         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8132         nfs4_set_sequence_privileged(&args.seq_args);
8133         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8134                         &args.seq_args, &res.seq_res);
8135         if (status != NFS_OK) {
8136                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8137                 return status;
8138         }
8139         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8140         return -res.status;
8141 }
8142
8143 /**
8144  * nfs41_test_stateid - perform a TEST_STATEID operation
8145  *
8146  * @server: server / transport on which to perform the operation
8147  * @stateid: state ID to test
8148  * @cred: credential
8149  *
8150  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8151  * Otherwise a negative NFS4ERR value is returned if the operation
8152  * failed or the state ID is not currently valid.
8153  */
8154 static int nfs41_test_stateid(struct nfs_server *server,
8155                 nfs4_stateid *stateid,
8156                 struct rpc_cred *cred)
8157 {
8158         struct nfs4_exception exception = { };
8159         int err;
8160         do {
8161                 err = _nfs41_test_stateid(server, stateid, cred);
8162                 if (err != -NFS4ERR_DELAY)
8163                         break;
8164                 nfs4_handle_exception(server, err, &exception);
8165         } while (exception.retry);
8166         return err;
8167 }
8168
8169 struct nfs_free_stateid_data {
8170         struct nfs_server *server;
8171         struct nfs41_free_stateid_args args;
8172         struct nfs41_free_stateid_res res;
8173 };
8174
8175 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8176 {
8177         struct nfs_free_stateid_data *data = calldata;
8178         nfs41_setup_sequence(nfs4_get_session(data->server),
8179                         &data->args.seq_args,
8180                         &data->res.seq_res,
8181                         task);
8182 }
8183
8184 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8185 {
8186         struct nfs_free_stateid_data *data = calldata;
8187
8188         nfs41_sequence_done(task, &data->res.seq_res);
8189
8190         switch (task->tk_status) {
8191         case -NFS4ERR_DELAY:
8192                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8193                         rpc_restart_call_prepare(task);
8194         }
8195 }
8196
8197 static void nfs41_free_stateid_release(void *calldata)
8198 {
8199         kfree(calldata);
8200 }
8201
8202 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8203         .rpc_call_prepare = nfs41_free_stateid_prepare,
8204         .rpc_call_done = nfs41_free_stateid_done,
8205         .rpc_release = nfs41_free_stateid_release,
8206 };
8207
8208 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8209                 nfs4_stateid *stateid,
8210                 struct rpc_cred *cred,
8211                 bool privileged)
8212 {
8213         struct rpc_message msg = {
8214                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8215                 .rpc_cred = cred,
8216         };
8217         struct rpc_task_setup task_setup = {
8218                 .rpc_client = server->client,
8219                 .rpc_message = &msg,
8220                 .callback_ops = &nfs41_free_stateid_ops,
8221                 .flags = RPC_TASK_ASYNC,
8222         };
8223         struct nfs_free_stateid_data *data;
8224
8225         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8226                 &task_setup.rpc_client, &msg);
8227
8228         dprintk("NFS call  free_stateid %p\n", stateid);
8229         data = kmalloc(sizeof(*data), GFP_NOFS);
8230         if (!data)
8231                 return ERR_PTR(-ENOMEM);
8232         data->server = server;
8233         nfs4_stateid_copy(&data->args.stateid, stateid);
8234
8235         task_setup.callback_data = data;
8236
8237         msg.rpc_argp = &data->args;
8238         msg.rpc_resp = &data->res;
8239         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8240         if (privileged)
8241                 nfs4_set_sequence_privileged(&data->args.seq_args);
8242
8243         return rpc_run_task(&task_setup);
8244 }
8245
8246 /**
8247  * nfs41_free_stateid - perform a FREE_STATEID operation
8248  *
8249  * @server: server / transport on which to perform the operation
8250  * @stateid: state ID to release
8251  * @cred: credential
8252  *
8253  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8254  * negative NFS4ERR value is returned.
8255  */
8256 static int nfs41_free_stateid(struct nfs_server *server,
8257                 nfs4_stateid *stateid,
8258                 struct rpc_cred *cred)
8259 {
8260         struct rpc_task *task;
8261         int ret;
8262
8263         task = _nfs41_free_stateid(server, stateid, cred, true);
8264         if (IS_ERR(task))
8265                 return PTR_ERR(task);
8266         ret = rpc_wait_for_completion_task(task);
8267         if (!ret)
8268                 ret = task->tk_status;
8269         rpc_put_task(task);
8270         return ret;
8271 }
8272
8273 static void
8274 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8275 {
8276         struct rpc_task *task;
8277         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8278
8279         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8280         nfs4_free_lock_state(server, lsp);
8281         if (IS_ERR(task))
8282                 return;
8283         rpc_put_task(task);
8284 }
8285
8286 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8287                 const nfs4_stateid *s2)
8288 {
8289         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8290                 return false;
8291
8292         if (s1->seqid == s2->seqid)
8293                 return true;
8294         if (s1->seqid == 0 || s2->seqid == 0)
8295                 return true;
8296
8297         return false;
8298 }
8299
8300 #endif /* CONFIG_NFS_V4_1 */
8301
8302 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8303                 const nfs4_stateid *s2)
8304 {
8305         return nfs4_stateid_match(s1, s2);
8306 }
8307
8308
8309 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8310         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8311         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8312         .recover_open   = nfs4_open_reclaim,
8313         .recover_lock   = nfs4_lock_reclaim,
8314         .establish_clid = nfs4_init_clientid,
8315         .detect_trunking = nfs40_discover_server_trunking,
8316 };
8317
8318 #if defined(CONFIG_NFS_V4_1)
8319 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8320         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8321         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8322         .recover_open   = nfs4_open_reclaim,
8323         .recover_lock   = nfs4_lock_reclaim,
8324         .establish_clid = nfs41_init_clientid,
8325         .reclaim_complete = nfs41_proc_reclaim_complete,
8326         .detect_trunking = nfs41_discover_server_trunking,
8327 };
8328 #endif /* CONFIG_NFS_V4_1 */
8329
8330 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8331         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8332         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8333         .recover_open   = nfs4_open_expired,
8334         .recover_lock   = nfs4_lock_expired,
8335         .establish_clid = nfs4_init_clientid,
8336 };
8337
8338 #if defined(CONFIG_NFS_V4_1)
8339 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8340         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8341         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8342         .recover_open   = nfs41_open_expired,
8343         .recover_lock   = nfs41_lock_expired,
8344         .establish_clid = nfs41_init_clientid,
8345 };
8346 #endif /* CONFIG_NFS_V4_1 */
8347
8348 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8349         .sched_state_renewal = nfs4_proc_async_renew,
8350         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8351         .renew_lease = nfs4_proc_renew,
8352 };
8353
8354 #if defined(CONFIG_NFS_V4_1)
8355 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8356         .sched_state_renewal = nfs41_proc_async_sequence,
8357         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8358         .renew_lease = nfs4_proc_sequence,
8359 };
8360 #endif
8361
8362 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8363         .get_locations = _nfs40_proc_get_locations,
8364         .fsid_present = _nfs40_proc_fsid_present,
8365 };
8366
8367 #if defined(CONFIG_NFS_V4_1)
8368 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8369         .get_locations = _nfs41_proc_get_locations,
8370         .fsid_present = _nfs41_proc_fsid_present,
8371 };
8372 #endif  /* CONFIG_NFS_V4_1 */
8373
8374 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8375         .minor_version = 0,
8376         .init_caps = NFS_CAP_READDIRPLUS
8377                 | NFS_CAP_ATOMIC_OPEN
8378                 | NFS_CAP_CHANGE_ATTR
8379                 | NFS_CAP_POSIX_LOCK,
8380         .init_client = nfs40_init_client,
8381         .shutdown_client = nfs40_shutdown_client,
8382         .match_stateid = nfs4_match_stateid,
8383         .find_root_sec = nfs4_find_root_sec,
8384         .free_lock_state = nfs4_release_lockowner,
8385         .call_sync_ops = &nfs40_call_sync_ops,
8386         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8387         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8388         .state_renewal_ops = &nfs40_state_renewal_ops,
8389         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8390 };
8391
8392 #if defined(CONFIG_NFS_V4_1)
8393 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8394         .minor_version = 1,
8395         .init_caps = NFS_CAP_READDIRPLUS
8396                 | NFS_CAP_ATOMIC_OPEN
8397                 | NFS_CAP_CHANGE_ATTR
8398                 | NFS_CAP_POSIX_LOCK
8399                 | NFS_CAP_STATEID_NFSV41
8400                 | NFS_CAP_ATOMIC_OPEN_V1
8401                 | NFS_CAP_SEEK,
8402         .init_client = nfs41_init_client,
8403         .shutdown_client = nfs41_shutdown_client,
8404         .match_stateid = nfs41_match_stateid,
8405         .find_root_sec = nfs41_find_root_sec,
8406         .free_lock_state = nfs41_free_lock_state,
8407         .call_sync_ops = &nfs41_call_sync_ops,
8408         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8409         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8410         .state_renewal_ops = &nfs41_state_renewal_ops,
8411         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8412 };
8413 #endif
8414
8415 #if defined(CONFIG_NFS_V4_2)
8416 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8417         .minor_version = 2,
8418         .init_caps = NFS_CAP_READDIRPLUS
8419                 | NFS_CAP_ATOMIC_OPEN
8420                 | NFS_CAP_CHANGE_ATTR
8421                 | NFS_CAP_POSIX_LOCK
8422                 | NFS_CAP_STATEID_NFSV41
8423                 | NFS_CAP_ATOMIC_OPEN_V1,
8424         .init_client = nfs41_init_client,
8425         .shutdown_client = nfs41_shutdown_client,
8426         .match_stateid = nfs41_match_stateid,
8427         .find_root_sec = nfs41_find_root_sec,
8428         .free_lock_state = nfs41_free_lock_state,
8429         .call_sync_ops = &nfs41_call_sync_ops,
8430         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8431         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8432         .state_renewal_ops = &nfs41_state_renewal_ops,
8433 };
8434 #endif
8435
8436 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8437         [0] = &nfs_v4_0_minor_ops,
8438 #if defined(CONFIG_NFS_V4_1)
8439         [1] = &nfs_v4_1_minor_ops,
8440 #endif
8441 #if defined(CONFIG_NFS_V4_2)
8442         [2] = &nfs_v4_2_minor_ops,
8443 #endif
8444 };
8445
8446 static const struct inode_operations nfs4_dir_inode_operations = {
8447         .create         = nfs_create,
8448         .lookup         = nfs_lookup,
8449         .atomic_open    = nfs_atomic_open,
8450         .link           = nfs_link,
8451         .unlink         = nfs_unlink,
8452         .symlink        = nfs_symlink,
8453         .mkdir          = nfs_mkdir,
8454         .rmdir          = nfs_rmdir,
8455         .mknod          = nfs_mknod,
8456         .rename         = nfs_rename,
8457         .permission     = nfs_permission,
8458         .getattr        = nfs_getattr,
8459         .setattr        = nfs_setattr,
8460         .getxattr       = generic_getxattr,
8461         .setxattr       = generic_setxattr,
8462         .listxattr      = generic_listxattr,
8463         .removexattr    = generic_removexattr,
8464 };
8465
8466 static const struct inode_operations nfs4_file_inode_operations = {
8467         .permission     = nfs_permission,
8468         .getattr        = nfs_getattr,
8469         .setattr        = nfs_setattr,
8470         .getxattr       = generic_getxattr,
8471         .setxattr       = generic_setxattr,
8472         .listxattr      = generic_listxattr,
8473         .removexattr    = generic_removexattr,
8474 };
8475
8476 const struct nfs_rpc_ops nfs_v4_clientops = {
8477         .version        = 4,                    /* protocol version */
8478         .dentry_ops     = &nfs4_dentry_operations,
8479         .dir_inode_ops  = &nfs4_dir_inode_operations,
8480         .file_inode_ops = &nfs4_file_inode_operations,
8481         .file_ops       = &nfs4_file_operations,
8482         .getroot        = nfs4_proc_get_root,
8483         .submount       = nfs4_submount,
8484         .try_mount      = nfs4_try_mount,
8485         .getattr        = nfs4_proc_getattr,
8486         .setattr        = nfs4_proc_setattr,
8487         .lookup         = nfs4_proc_lookup,
8488         .access         = nfs4_proc_access,
8489         .readlink       = nfs4_proc_readlink,
8490         .create         = nfs4_proc_create,
8491         .remove         = nfs4_proc_remove,
8492         .unlink_setup   = nfs4_proc_unlink_setup,
8493         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8494         .unlink_done    = nfs4_proc_unlink_done,
8495         .rename_setup   = nfs4_proc_rename_setup,
8496         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8497         .rename_done    = nfs4_proc_rename_done,
8498         .link           = nfs4_proc_link,
8499         .symlink        = nfs4_proc_symlink,
8500         .mkdir          = nfs4_proc_mkdir,
8501         .rmdir          = nfs4_proc_remove,
8502         .readdir        = nfs4_proc_readdir,
8503         .mknod          = nfs4_proc_mknod,
8504         .statfs         = nfs4_proc_statfs,
8505         .fsinfo         = nfs4_proc_fsinfo,
8506         .pathconf       = nfs4_proc_pathconf,
8507         .set_capabilities = nfs4_server_capabilities,
8508         .decode_dirent  = nfs4_decode_dirent,
8509         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8510         .read_setup     = nfs4_proc_read_setup,
8511         .read_done      = nfs4_read_done,
8512         .write_setup    = nfs4_proc_write_setup,
8513         .write_done     = nfs4_write_done,
8514         .commit_setup   = nfs4_proc_commit_setup,
8515         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8516         .commit_done    = nfs4_commit_done,
8517         .lock           = nfs4_proc_lock,
8518         .clear_acl_cache = nfs4_zap_acl_attr,
8519         .close_context  = nfs4_close_context,
8520         .open_context   = nfs4_atomic_open,
8521         .have_delegation = nfs4_have_delegation,
8522         .return_delegation = nfs4_inode_return_delegation,
8523         .alloc_client   = nfs4_alloc_client,
8524         .init_client    = nfs4_init_client,
8525         .free_client    = nfs4_free_client,
8526         .create_server  = nfs4_create_server,
8527         .clone_server   = nfs_clone_server,
8528 };
8529
8530 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8531         .prefix = XATTR_NAME_NFSV4_ACL,
8532         .list   = nfs4_xattr_list_nfs4_acl,
8533         .get    = nfs4_xattr_get_nfs4_acl,
8534         .set    = nfs4_xattr_set_nfs4_acl,
8535 };
8536
8537 const struct xattr_handler *nfs4_xattr_handlers[] = {
8538         &nfs4_xattr_nfs4_acl_handler,
8539 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8540         &nfs4_xattr_nfs4_label_handler,
8541 #endif
8542         NULL
8543 };
8544
8545 /*
8546  * Local variables:
8547  *  c-basic-offset: 8
8548  * End:
8549  */