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 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state);
  85 #ifdef CONFIG_NFS_V4_1
  86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  88 #endif
  89 /* Prevent leaks of NFSv4 errors into userland */
  90 static int nfs4_map_errors(int err)
  91 {
  92         if (err >= -1000)
  93                 return err;
  94         switch (err) {
  95         case -NFS4ERR_RESOURCE:
  96         case -NFS4ERR_LAYOUTTRYLATER:
  97         case -NFS4ERR_RECALLCONFLICT:
  98                 return -EREMOTEIO;
  99         case -NFS4ERR_WRONGSEC:
 100                 return -EPERM;
 101         case -NFS4ERR_BADOWNER:
 102         case -NFS4ERR_BADNAME:
 103                 return -EINVAL;
 104         case -NFS4ERR_SHARE_DENIED:
 105                 return -EACCES;
 106         case -NFS4ERR_MINOR_VERS_MISMATCH:
 107                 return -EPROTONOSUPPORT;
 108         case -NFS4ERR_ACCESS:
 109                 return -EACCES;
 110         default:
 111                 dprintk("%s could not handle NFSv4 error %d\n",
 112                                 __func__, -err);
 113                 break;
 114         }
 115         return -EIO;
 116 }
 117
 118 /*
 119  * This is our standard bitmap for GETATTR requests.
 120  */
 121 const u32 nfs4_fattr_bitmap[3] = {
 122         FATTR4_WORD0_TYPE
 123         | FATTR4_WORD0_CHANGE
 124         | FATTR4_WORD0_SIZE
 125         | FATTR4_WORD0_FSID
 126         | FATTR4_WORD0_FILEID,
 127         FATTR4_WORD1_MODE
 128         | FATTR4_WORD1_NUMLINKS
 129         | FATTR4_WORD1_OWNER
 130         | FATTR4_WORD1_OWNER_GROUP
 131         | FATTR4_WORD1_RAWDEV
 132         | FATTR4_WORD1_SPACE_USED
 133         | FATTR4_WORD1_TIME_ACCESS
 134         | FATTR4_WORD1_TIME_METADATA
 135         | FATTR4_WORD1_TIME_MODIFY
 136 };
 137
 138 static const u32 nfs4_pnfs_open_bitmap[3] = {
 139         FATTR4_WORD0_TYPE
 140         | FATTR4_WORD0_CHANGE
 141         | FATTR4_WORD0_SIZE
 142         | FATTR4_WORD0_FSID
 143         | FATTR4_WORD0_FILEID,
 144         FATTR4_WORD1_MODE
 145         | FATTR4_WORD1_NUMLINKS
 146         | FATTR4_WORD1_OWNER
 147         | FATTR4_WORD1_OWNER_GROUP
 148         | FATTR4_WORD1_RAWDEV
 149         | FATTR4_WORD1_SPACE_USED
 150         | FATTR4_WORD1_TIME_ACCESS
 151         | FATTR4_WORD1_TIME_METADATA
 152         | FATTR4_WORD1_TIME_MODIFY,
 153         FATTR4_WORD2_MDSTHRESHOLD
 154 };
 155
 156 static const u32 nfs4_open_noattr_bitmap[3] = {
 157         FATTR4_WORD0_TYPE
 158         | FATTR4_WORD0_CHANGE
 159         | FATTR4_WORD0_FILEID,
 160 };
 161
 162 const u32 nfs4_statfs_bitmap[2] = {
 163         FATTR4_WORD0_FILES_AVAIL
 164         | FATTR4_WORD0_FILES_FREE
 165         | FATTR4_WORD0_FILES_TOTAL,
 166         FATTR4_WORD1_SPACE_AVAIL
 167         | FATTR4_WORD1_SPACE_FREE
 168         | FATTR4_WORD1_SPACE_TOTAL
 169 };
 170
 171 const u32 nfs4_pathconf_bitmap[2] = {
 172         FATTR4_WORD0_MAXLINK
 173         | FATTR4_WORD0_MAXNAME,
 174         0
 175 };
 176
 177 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 178                         | FATTR4_WORD0_MAXREAD
 179                         | FATTR4_WORD0_MAXWRITE
 180                         | FATTR4_WORD0_LEASE_TIME,
 181                         FATTR4_WORD1_TIME_DELTA
 182                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 183                         FATTR4_WORD2_LAYOUT_BLKSIZE
 184 };
 185
 186 const u32 nfs4_fs_locations_bitmap[2] = {
 187         FATTR4_WORD0_TYPE
 188         | FATTR4_WORD0_CHANGE
 189         | FATTR4_WORD0_SIZE
 190         | FATTR4_WORD0_FSID
 191         | FATTR4_WORD0_FILEID
 192         | FATTR4_WORD0_FS_LOCATIONS,
 193         FATTR4_WORD1_MODE
 194         | FATTR4_WORD1_NUMLINKS
 195         | FATTR4_WORD1_OWNER
 196         | FATTR4_WORD1_OWNER_GROUP
 197         | FATTR4_WORD1_RAWDEV
 198         | FATTR4_WORD1_SPACE_USED
 199         | FATTR4_WORD1_TIME_ACCESS
 200         | FATTR4_WORD1_TIME_METADATA
 201         | FATTR4_WORD1_TIME_MODIFY
 202         | FATTR4_WORD1_MOUNTED_ON_FILEID
 203 };
 204
 205 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 206                 struct nfs4_readdir_arg *readdir)
 207 {
 208         __be32 *start, *p;
 209
 210         if (cookie > 2) {
 211                 readdir->cookie = cookie;
 212                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 213                 return;
 214         }
 215
 216         readdir->cookie = 0;
 217         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 218         if (cookie == 2)
 219                 return;
 220
 221         /*
 222          * NFSv4 servers do not return entries for '.' and '..'
 223          * Therefore, we fake these entries here.  We let '.'
 224          * have cookie 0 and '..' have cookie 1.  Note that
 225          * when talking to the server, we always send cookie 0
 226          * instead of 1 or 2.
 227          */
 228         start = p = kmap_atomic(*readdir->pages);
 229
 230         if (cookie == 0) {
 231                 *p++ = xdr_one;                                  /* next */
 232                 *p++ = xdr_zero;                   /* cookie, first word */
 233                 *p++ = xdr_one;                   /* cookie, second word */
 234                 *p++ = xdr_one;                             /* entry len */
 235                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 236                 p++;
 237                 *p++ = xdr_one;                         /* bitmap length */
 238                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 239                 *p++ = htonl(8);              /* attribute buffer length */
 240                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 241         }
 242
 243         *p++ = xdr_one;                                  /* next */
 244         *p++ = xdr_zero;                   /* cookie, first word */
 245         *p++ = xdr_two;                   /* cookie, second word */
 246         *p++ = xdr_two;                             /* entry len */
 247         memcpy(p, "..\0\0", 4);                         /* entry */
 248         p++;
 249         *p++ = xdr_one;                         /* bitmap length */
 250         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 251         *p++ = htonl(8);              /* attribute buffer length */
 252         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 253
 254         readdir->pgbase = (char *)p - (char *)start;
 255         readdir->count -= readdir->pgbase;
 256         kunmap_atomic(start);
 257 }
 258
 259 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 260 {
 261         int res = 0;
 262
 263         might_sleep();
 264
 265         if (*timeout <= 0)
 266                 *timeout = NFS4_POLL_RETRY_MIN;
 267         if (*timeout > NFS4_POLL_RETRY_MAX)
 268                 *timeout = NFS4_POLL_RETRY_MAX;
 269         freezable_schedule_timeout_killable(*timeout);
 270         if (fatal_signal_pending(current))
 271                 res = -ERESTARTSYS;
 272         *timeout <<= 1;
 273         return res;
 274 }
 275
 276 /* This is the error handling routine for processes that are allowed
 277  * to sleep.
 278  */
 279 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 280 {
 281         struct nfs_client *clp = server->nfs_client;
 282         struct nfs4_state *state = exception->state;
 283         struct inode *inode = exception->inode;
 284         int ret = errorcode;
 285
 286         exception->retry = 0;
 287         switch(errorcode) {
 288                 case 0:
 289                         return 0;
 290                 case -NFS4ERR_OPENMODE:
 291                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 292                                 nfs4_inode_return_delegation(inode);
 293                                 exception->retry = 1;
 294                                 return 0;
 295                         }
 296                         if (state == NULL)
 297                                 break;
 298                         nfs4_schedule_stateid_recovery(server, state);
 299                         goto wait_on_recovery;
 300                 case -NFS4ERR_DELEG_REVOKED:
 301                 case -NFS4ERR_ADMIN_REVOKED:
 302                 case -NFS4ERR_BAD_STATEID:
 303                         if (state == NULL)
 304                                 break;
 305                         nfs_remove_bad_delegation(state->inode);
 306                         nfs4_schedule_stateid_recovery(server, state);
 307                         goto wait_on_recovery;
 308                 case -NFS4ERR_EXPIRED:
 309                         if (state != NULL)
 310                                 nfs4_schedule_stateid_recovery(server, state);
 311                 case -NFS4ERR_STALE_STATEID:
 312                 case -NFS4ERR_STALE_CLIENTID:
 313                         nfs4_schedule_lease_recovery(clp);
 314                         goto wait_on_recovery;
 315 #if defined(CONFIG_NFS_V4_1)
 316                 case -NFS4ERR_BADSESSION:
 317                 case -NFS4ERR_BADSLOT:
 318                 case -NFS4ERR_BAD_HIGH_SLOT:
 319                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 320                 case -NFS4ERR_DEADSESSION:
 321                 case -NFS4ERR_SEQ_FALSE_RETRY:
 322                 case -NFS4ERR_SEQ_MISORDERED:
 323                         dprintk("%s ERROR: %d Reset session\n", __func__,
 324                                 errorcode);
 325                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 326                         goto wait_on_recovery;
 327 #endif /* defined(CONFIG_NFS_V4_1) */
 328                 case -NFS4ERR_FILE_OPEN:
 329                         if (exception->timeout > HZ) {
 330                                 /* We have retried a decent amount, time to
 331                                  * fail
 332                                  */
 333                                 ret = -EBUSY;
 334                                 break;
 335                         }
 336                 case -NFS4ERR_GRACE:
 337                 case -NFS4ERR_DELAY:
 338                         ret = nfs4_delay(server->client, &exception->timeout);
 339                         if (ret != 0)
 340                                 break;
 341                 case -NFS4ERR_RETRY_UNCACHED_REP:
 342                 case -NFS4ERR_OLD_STATEID:
 343                         exception->retry = 1;
 344                         break;
 345                 case -NFS4ERR_BADOWNER:
 346                         /* The following works around a Linux server bug! */
 347                 case -NFS4ERR_BADNAME:
 348                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 349                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 350                                 exception->retry = 1;
 351                                 printk(KERN_WARNING "NFS: v4 server %s "
 352                                                 "does not accept raw "
 353                                                 "uid/gids. "
 354                                                 "Reenabling the idmapper.\n",
 355                                                 server->nfs_client->cl_hostname);
 356                         }
 357         }
 358         /* We failed to handle the error */
 359         return nfs4_map_errors(ret);
 360 wait_on_recovery:
 361         ret = nfs4_wait_clnt_recover(clp);
 362         if (ret == 0)
 363                 exception->retry = 1;
 364         return ret;
 365 }
 366
 367
 368 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 369 {
 370         spin_lock(&clp->cl_lock);
 371         if (time_before(clp->cl_last_renewal,timestamp))
 372                 clp->cl_last_renewal = timestamp;
 373         spin_unlock(&clp->cl_lock);
 374 }
 375
 376 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 377 {
 378         do_renew_lease(server->nfs_client, timestamp);
 379 }
 380
 381 #if defined(CONFIG_NFS_V4_1)
 382
 383 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 384 {
 385         struct nfs4_session *session;
 386         struct nfs4_slot_table *tbl;
 387         bool send_new_highest_used_slotid = false;
 388
 389         if (!res->sr_slot) {
 390                 /* just wake up the next guy waiting since
 391                  * we may have not consumed a slot after all */
 392                 dprintk("%s: No slot\n", __func__);
 393                 return;
 394         }
 395         tbl = res->sr_slot->table;
 396         session = tbl->session;
 397
 398         spin_lock(&tbl->slot_tbl_lock);
 399         /* Be nice to the server: try to ensure that the last transmitted
 400          * value for highest_user_slotid <= target_highest_slotid
 401          */
 402         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 403                 send_new_highest_used_slotid = true;
 404
 405         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 406                 send_new_highest_used_slotid = false;
 407                 goto out_unlock;
 408         }
 409         nfs4_free_slot(tbl, res->sr_slot);
 410
 411         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 412                 send_new_highest_used_slotid = false;
 413 out_unlock:
 414         spin_unlock(&tbl->slot_tbl_lock);
 415         res->sr_slot = NULL;
 416         if (send_new_highest_used_slotid)
 417                 nfs41_server_notify_highest_slotid_update(session->clp);
 418 }
 419
 420 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 421 {
 422         struct nfs4_session *session;
 423         struct nfs4_slot *slot;
 424         struct nfs_client *clp;
 425         bool interrupted = false;
 426         int ret = 1;
 427
 428         /* don't increment the sequence number if the task wasn't sent */
 429         if (!RPC_WAS_SENT(task))
 430                 goto out;
 431
 432         slot = res->sr_slot;
 433         session = slot->table->session;
 434
 435         if (slot->interrupted) {
 436                 slot->interrupted = 0;
 437                 interrupted = true;
 438         }
 439
 440         /* Check the SEQUENCE operation status */
 441         switch (res->sr_status) {
 442         case 0:
 443                 /* Update the slot's sequence and clientid lease timer */
 444                 ++slot->seq_nr;
 445                 clp = session->clp;
 446                 do_renew_lease(clp, res->sr_timestamp);
 447                 /* Check sequence flags */
 448                 if (res->sr_status_flags != 0)
 449                         nfs4_schedule_lease_recovery(clp);
 450                 nfs41_update_target_slotid(slot->table, slot, res);
 451                 break;
 452         case 1:
 453                 /*
 454                  * sr_status remains 1 if an RPC level error occurred.
 455                  * The server may or may not have processed the sequence
 456                  * operation..
 457                  * Mark the slot as having hosted an interrupted RPC call.
 458                  */
 459                 slot->interrupted = 1;
 460                 goto out;
 461         case -NFS4ERR_DELAY:
 462                 /* The server detected a resend of the RPC call and
 463                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 464                  * of RFC5661.
 465                  */
 466                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 467                         __func__,
 468                         slot->slot_nr,
 469                         slot->seq_nr);
 470                 goto out_retry;
 471         case -NFS4ERR_BADSLOT:
 472                 /*
 473                  * The slot id we used was probably retired. Try again
 474                  * using a different slot id.
 475                  */
 476                 goto retry_nowait;
 477         case -NFS4ERR_SEQ_MISORDERED:
 478                 /*
 479                  * Was the last operation on this sequence interrupted?
 480                  * If so, retry after bumping the sequence number.
 481                  */
 482                 if (interrupted) {
 483                         ++slot->seq_nr;
 484                         goto retry_nowait;
 485                 }
 486                 /*
 487                  * Could this slot have been previously retired?
 488                  * If so, then the server may be expecting seq_nr = 1!
 489                  */
 490                 if (slot->seq_nr != 1) {
 491                         slot->seq_nr = 1;
 492                         goto retry_nowait;
 493                 }
 494                 break;
 495         case -NFS4ERR_SEQ_FALSE_RETRY:
 496                 ++slot->seq_nr;
 497                 goto retry_nowait;
 498         default:
 499                 /* Just update the slot sequence no. */
 500                 ++slot->seq_nr;
 501         }
 502 out:
 503         /* The session may be reset by one of the error handlers. */
 504         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 505         nfs41_sequence_free_slot(res);
 506         return ret;
 507 retry_nowait:
 508         if (rpc_restart_call_prepare(task)) {
 509                 task->tk_status = 0;
 510                 ret = 0;
 511         }
 512         goto out;
 513 out_retry:
 514         if (!rpc_restart_call(task))
 515                 goto out;
 516         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 517         return 0;
 518 }
 519
 520 static int nfs4_sequence_done(struct rpc_task *task,
 521                                struct nfs4_sequence_res *res)
 522 {
 523         if (res->sr_slot == NULL)
 524                 return 1;
 525         return nfs41_sequence_done(task, res);
 526 }
 527
 528 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 529                 struct nfs4_sequence_res *res, int cache_reply)
 530 {
 531         args->sa_slot = NULL;
 532         args->sa_cache_this = 0;
 533         args->sa_privileged = 0;
 534         if (cache_reply)
 535                 args->sa_cache_this = 1;
 536         res->sr_slot = NULL;
 537 }
 538
 539 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 540 {
 541         args->sa_privileged = 1;
 542 }
 543
 544 int nfs41_setup_sequence(struct nfs4_session *session,
 545                                 struct nfs4_sequence_args *args,
 546                                 struct nfs4_sequence_res *res,
 547                                 struct rpc_task *task)
 548 {
 549         struct nfs4_slot *slot;
 550         struct nfs4_slot_table *tbl;
 551
 552         dprintk("--> %s\n", __func__);
 553         /* slot already allocated? */
 554         if (res->sr_slot != NULL)
 555                 goto out_success;
 556
 557         tbl = &session->fc_slot_table;
 558
 559         task->tk_timeout = 0;
 560
 561         spin_lock(&tbl->slot_tbl_lock);
 562         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 563             !args->sa_privileged) {
 564                 /* The state manager will wait until the slot table is empty */
 565                 dprintk("%s session is draining\n", __func__);
 566                 goto out_sleep;
 567         }
 568
 569         slot = nfs4_alloc_slot(tbl);
 570         if (IS_ERR(slot)) {
 571                 /* If out of memory, try again in 1/4 second */
 572                 if (slot == ERR_PTR(-ENOMEM))
 573                         task->tk_timeout = HZ >> 2;
 574                 dprintk("<-- %s: no free slots\n", __func__);
 575                 goto out_sleep;
 576         }
 577         spin_unlock(&tbl->slot_tbl_lock);
 578
 579         args->sa_slot = slot;
 580
 581         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 582                         slot->slot_nr, slot->seq_nr);
 583
 584         res->sr_slot = slot;
 585         res->sr_timestamp = jiffies;
 586         res->sr_status_flags = 0;
 587         /*
 588          * sr_status is only set in decode_sequence, and so will remain
 589          * set to 1 if an rpc level failure occurs.
 590          */
 591         res->sr_status = 1;
 592 out_success:
 593         rpc_call_start(task);
 594         return 0;
 595 out_sleep:
 596         /* Privileged tasks are queued with top priority */
 597         if (args->sa_privileged)
 598                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 599                                 NULL, RPC_PRIORITY_PRIVILEGED);
 600         else
 601                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 602         spin_unlock(&tbl->slot_tbl_lock);
 603         return -EAGAIN;
 604 }
 605 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 606
 607 int nfs4_setup_sequence(const struct nfs_server *server,
 608                         struct nfs4_sequence_args *args,
 609                         struct nfs4_sequence_res *res,
 610                         struct rpc_task *task)
 611 {
 612         struct nfs4_session *session = nfs4_get_session(server);
 613         int ret = 0;
 614
 615         if (session == NULL) {
 616                 rpc_call_start(task);
 617                 goto out;
 618         }
 619
 620         dprintk("--> %s clp %p session %p sr_slot %d\n",
 621                 __func__, session->clp, session, res->sr_slot ?
 622                         res->sr_slot->slot_nr : -1);
 623
 624         ret = nfs41_setup_sequence(session, args, res, task);
 625 out:
 626         dprintk("<-- %s status=%d\n", __func__, ret);
 627         return ret;
 628 }
 629
 630 struct nfs41_call_sync_data {
 631         const struct nfs_server *seq_server;
 632         struct nfs4_sequence_args *seq_args;
 633         struct nfs4_sequence_res *seq_res;
 634 };
 635
 636 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 637 {
 638         struct nfs41_call_sync_data *data = calldata;
 639         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 640
 641         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 642
 643         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 644 }
 645
 646 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 647 {
 648         struct nfs41_call_sync_data *data = calldata;
 649
 650         nfs41_sequence_done(task, data->seq_res);
 651 }
 652
 653 static const struct rpc_call_ops nfs41_call_sync_ops = {
 654         .rpc_call_prepare = nfs41_call_sync_prepare,
 655         .rpc_call_done = nfs41_call_sync_done,
 656 };
 657
 658 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 659                                    struct nfs_server *server,
 660                                    struct rpc_message *msg,
 661                                    struct nfs4_sequence_args *args,
 662                                    struct nfs4_sequence_res *res)
 663 {
 664         int ret;
 665         struct rpc_task *task;
 666         struct nfs41_call_sync_data data = {
 667                 .seq_server = server,
 668                 .seq_args = args,
 669                 .seq_res = res,
 670         };
 671         struct rpc_task_setup task_setup = {
 672                 .rpc_client = clnt,
 673                 .rpc_message = msg,
 674                 .callback_ops = &nfs41_call_sync_ops,
 675                 .callback_data = &data
 676         };
 677
 678         task = rpc_run_task(&task_setup);
 679         if (IS_ERR(task))
 680                 ret = PTR_ERR(task);
 681         else {
 682                 ret = task->tk_status;
 683                 rpc_put_task(task);
 684         }
 685         return ret;
 686 }
 687
 688 #else
 689 static
 690 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 691                 struct nfs4_sequence_res *res, int cache_reply)
 692 {
 693 }
 694
 695 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 696 {
 697 }
 698
 699
 700 static int nfs4_sequence_done(struct rpc_task *task,
 701                                struct nfs4_sequence_res *res)
 702 {
 703         return 1;
 704 }
 705 #endif /* CONFIG_NFS_V4_1 */
 706
 707 static
 708 int _nfs4_call_sync(struct rpc_clnt *clnt,
 709                     struct nfs_server *server,
 710                     struct rpc_message *msg,
 711                     struct nfs4_sequence_args *args,
 712                     struct nfs4_sequence_res *res)
 713 {
 714         return rpc_call_sync(clnt, msg, 0);
 715 }
 716
 717 static
 718 int nfs4_call_sync(struct rpc_clnt *clnt,
 719                    struct nfs_server *server,
 720                    struct rpc_message *msg,
 721                    struct nfs4_sequence_args *args,
 722                    struct nfs4_sequence_res *res,
 723                    int cache_reply)
 724 {
 725         nfs41_init_sequence(args, res, cache_reply);
 726         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 727                                                 args, res);
 728 }
 729
 730 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 731 {
 732         struct nfs_inode *nfsi = NFS_I(dir);
 733
 734         spin_lock(&dir->i_lock);
 735         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 736         if (!cinfo->atomic || cinfo->before != dir->i_version)
 737                 nfs_force_lookup_revalidate(dir);
 738         dir->i_version = cinfo->after;
 739         nfs_fscache_invalidate(dir);
 740         spin_unlock(&dir->i_lock);
 741 }
 742
 743 struct nfs4_opendata {
 744         struct kref kref;
 745         struct nfs_openargs o_arg;
 746         struct nfs_openres o_res;
 747         struct nfs_open_confirmargs c_arg;
 748         struct nfs_open_confirmres c_res;
 749         struct nfs4_string owner_name;
 750         struct nfs4_string group_name;
 751         struct nfs_fattr f_attr;
 752         struct dentry *dir;
 753         struct dentry *dentry;
 754         struct nfs4_state_owner *owner;
 755         struct nfs4_state *state;
 756         struct iattr attrs;
 757         unsigned long timestamp;
 758         unsigned int rpc_done : 1;
 759         int rpc_status;
 760         int cancelled;
 761 };
 762
 763
 764 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 765 {
 766         p->o_res.f_attr = &p->f_attr;
 767         p->o_res.seqid = p->o_arg.seqid;
 768         p->c_res.seqid = p->c_arg.seqid;
 769         p->o_res.server = p->o_arg.server;
 770         p->o_res.access_request = p->o_arg.access;
 771         nfs_fattr_init(&p->f_attr);
 772         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 773 }
 774
 775 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 776                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 777                 const struct iattr *attrs,
 778                 gfp_t gfp_mask)
 779 {
 780         struct dentry *parent = dget_parent(dentry);
 781         struct inode *dir = parent->d_inode;
 782         struct nfs_server *server = NFS_SERVER(dir);
 783         struct nfs4_opendata *p;
 784
 785         p = kzalloc(sizeof(*p), gfp_mask);
 786         if (p == NULL)
 787                 goto err;
 788         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 789         if (p->o_arg.seqid == NULL)
 790                 goto err_free;
 791         nfs_sb_active(dentry->d_sb);
 792         p->dentry = dget(dentry);
 793         p->dir = parent;
 794         p->owner = sp;
 795         atomic_inc(&sp->so_count);
 796         p->o_arg.fh = NFS_FH(dir);
 797         p->o_arg.open_flags = flags;
 798         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 799         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 800          * will return permission denied for all bits until close */
 801         if (!(flags & O_EXCL)) {
 802                 /* ask server to check for all possible rights as results
 803                  * are cached */
 804                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 805                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 806         }
 807         p->o_arg.clientid = server->nfs_client->cl_clientid;
 808         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 809         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 810         p->o_arg.name = &dentry->d_name;
 811         p->o_arg.server = server;
 812         p->o_arg.bitmask = server->attr_bitmask;
 813         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 814         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 815         if (attrs != NULL && attrs->ia_valid != 0) {
 816                 __be32 verf[2];
 817
 818                 p->o_arg.u.attrs = &p->attrs;
 819                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 820
 821                 verf[0] = jiffies;
 822                 verf[1] = current->pid;
 823                 memcpy(p->o_arg.u.verifier.data, verf,
 824                                 sizeof(p->o_arg.u.verifier.data));
 825         }
 826         p->c_arg.fh = &p->o_res.fh;
 827         p->c_arg.stateid = &p->o_res.stateid;
 828         p->c_arg.seqid = p->o_arg.seqid;
 829         nfs4_init_opendata_res(p);
 830         kref_init(&p->kref);
 831         return p;
 832 err_free:
 833         kfree(p);
 834 err:
 835         dput(parent);
 836         return NULL;
 837 }
 838
 839 static void nfs4_opendata_free(struct kref *kref)
 840 {
 841         struct nfs4_opendata *p = container_of(kref,
 842                         struct nfs4_opendata, kref);
 843         struct super_block *sb = p->dentry->d_sb;
 844
 845         nfs_free_seqid(p->o_arg.seqid);
 846         if (p->state != NULL)
 847                 nfs4_put_open_state(p->state);
 848         nfs4_put_state_owner(p->owner);
 849         dput(p->dir);
 850         dput(p->dentry);
 851         nfs_sb_deactive(sb);
 852         nfs_fattr_free_names(&p->f_attr);
 853         kfree(p);
 854 }
 855
 856 static void nfs4_opendata_put(struct nfs4_opendata *p)
 857 {
 858         if (p != NULL)
 859                 kref_put(&p->kref, nfs4_opendata_free);
 860 }
 861
 862 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 863 {
 864         int ret;
 865
 866         ret = rpc_wait_for_completion_task(task);
 867         return ret;
 868 }
 869
 870 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 871 {
 872         int ret = 0;
 873
 874         if (open_mode & (O_EXCL|O_TRUNC))
 875                 goto out;
 876         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 877                 case FMODE_READ:
 878                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 879                                 && state->n_rdonly != 0;
 880                         break;
 881                 case FMODE_WRITE:
 882                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 883                                 && state->n_wronly != 0;
 884                         break;
 885                 case FMODE_READ|FMODE_WRITE:
 886                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 887                                 && state->n_rdwr != 0;
 888         }
 889 out:
 890         return ret;
 891 }
 892
 893 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 894 {
 895         if (delegation == NULL)
 896                 return 0;
 897         if ((delegation->type & fmode) != fmode)
 898                 return 0;
 899         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 900                 return 0;
 901         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
 902                 return 0;
 903         nfs_mark_delegation_referenced(delegation);
 904         return 1;
 905 }
 906
 907 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 908 {
 909         switch (fmode) {
 910                 case FMODE_WRITE:
 911                         state->n_wronly++;
 912                         break;
 913                 case FMODE_READ:
 914                         state->n_rdonly++;
 915                         break;
 916                 case FMODE_READ|FMODE_WRITE:
 917                         state->n_rdwr++;
 918         }
 919         nfs4_state_set_mode_locked(state, state->state | fmode);
 920 }
 921
 922 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 923 {
 924         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 925                 nfs4_stateid_copy(&state->stateid, stateid);
 926         nfs4_stateid_copy(&state->open_stateid, stateid);
 927         switch (fmode) {
 928                 case FMODE_READ:
 929                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 930                         break;
 931                 case FMODE_WRITE:
 932                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 933                         break;
 934                 case FMODE_READ|FMODE_WRITE:
 935                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 936         }
 937 }
 938
 939 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 940 {
 941         write_seqlock(&state->seqlock);
 942         nfs_set_open_stateid_locked(state, stateid, fmode);
 943         write_sequnlock(&state->seqlock);
 944 }
 945
 946 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 947 {
 948         /*
 949          * Protect the call to nfs4_state_set_mode_locked and
 950          * serialise the stateid update
 951          */
 952         write_seqlock(&state->seqlock);
 953         if (deleg_stateid != NULL) {
 954                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 955                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 956         }
 957         if (open_stateid != NULL)
 958                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 959         write_sequnlock(&state->seqlock);
 960         spin_lock(&state->owner->so_lock);
 961         update_open_stateflags(state, fmode);
 962         spin_unlock(&state->owner->so_lock);
 963 }
 964
 965 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 966 {
 967         struct nfs_inode *nfsi = NFS_I(state->inode);
 968         struct nfs_delegation *deleg_cur;
 969         int ret = 0;
 970
 971         fmode &= (FMODE_READ|FMODE_WRITE);
 972
 973         rcu_read_lock();
 974         deleg_cur = rcu_dereference(nfsi->delegation);
 975         if (deleg_cur == NULL)
 976                 goto no_delegation;
 977
 978         spin_lock(&deleg_cur->lock);
 979         if (nfsi->delegation != deleg_cur ||
 980            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
 981             (deleg_cur->type & fmode) != fmode)
 982                 goto no_delegation_unlock;
 983
 984         if (delegation == NULL)
 985                 delegation = &deleg_cur->stateid;
 986         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 987                 goto no_delegation_unlock;
 988
 989         nfs_mark_delegation_referenced(deleg_cur);
 990         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 991         ret = 1;
 992 no_delegation_unlock:
 993         spin_unlock(&deleg_cur->lock);
 994 no_delegation:
 995         rcu_read_unlock();
 996
 997         if (!ret && open_stateid != NULL) {
 998                 __update_open_stateid(state, open_stateid, NULL, fmode);
 999                 ret = 1;
1000         }
1001
1002         return ret;
1003 }
1004
1005
1006 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1007 {
1008         struct nfs_delegation *delegation;
1009
1010         rcu_read_lock();
1011         delegation = rcu_dereference(NFS_I(inode)->delegation);
1012         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1013                 rcu_read_unlock();
1014                 return;
1015         }
1016         rcu_read_unlock();
1017         nfs4_inode_return_delegation(inode);
1018 }
1019
1020 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1021 {
1022         struct nfs4_state *state = opendata->state;
1023         struct nfs_inode *nfsi = NFS_I(state->inode);
1024         struct nfs_delegation *delegation;
1025         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1026         fmode_t fmode = opendata->o_arg.fmode;
1027         nfs4_stateid stateid;
1028         int ret = -EAGAIN;
1029
1030         for (;;) {
1031                 if (can_open_cached(state, fmode, open_mode)) {
1032                         spin_lock(&state->owner->so_lock);
1033                         if (can_open_cached(state, fmode, open_mode)) {
1034                                 update_open_stateflags(state, fmode);
1035                                 spin_unlock(&state->owner->so_lock);
1036                                 goto out_return_state;
1037                         }
1038                         spin_unlock(&state->owner->so_lock);
1039                 }
1040                 rcu_read_lock();
1041                 delegation = rcu_dereference(nfsi->delegation);
1042                 if (!can_open_delegated(delegation, fmode)) {
1043                         rcu_read_unlock();
1044                         break;
1045                 }
1046                 /* Save the delegation */
1047                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1048                 rcu_read_unlock();
1049                 nfs_release_seqid(opendata->o_arg.seqid);
1050                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1051                 if (ret != 0)
1052                         goto out;
1053                 ret = -EAGAIN;
1054
1055                 /* Try to update the stateid using the delegation */
1056                 if (update_open_stateid(state, NULL, &stateid, fmode))
1057                         goto out_return_state;
1058         }
1059 out:
1060         return ERR_PTR(ret);
1061 out_return_state:
1062         atomic_inc(&state->count);
1063         return state;
1064 }
1065
1066 static void
1067 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1068 {
1069         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1070         struct nfs_delegation *delegation;
1071         int delegation_flags = 0;
1072
1073         rcu_read_lock();
1074         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1075         if (delegation)
1076                 delegation_flags = delegation->flags;
1077         rcu_read_unlock();
1078         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1079                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1080                                    "returning a delegation for "
1081                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1082                                    clp->cl_hostname);
1083         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1084                 nfs_inode_set_delegation(state->inode,
1085                                          data->owner->so_cred,
1086                                          &data->o_res);
1087         else
1088                 nfs_inode_reclaim_delegation(state->inode,
1089                                              data->owner->so_cred,
1090                                              &data->o_res);
1091 }
1092
1093 /*
1094  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1095  * and update the nfs4_state.
1096  */
1097 static struct nfs4_state *
1098 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1099 {
1100         struct inode *inode = data->state->inode;
1101         struct nfs4_state *state = data->state;
1102         int ret;
1103
1104         if (!data->rpc_done) {
1105                 ret = data->rpc_status;
1106                 goto err;
1107         }
1108
1109         ret = -ESTALE;
1110         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1111             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1112             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1113                 goto err;
1114
1115         ret = -ENOMEM;
1116         state = nfs4_get_open_state(inode, data->owner);
1117         if (state == NULL)
1118                 goto err;
1119
1120         ret = nfs_refresh_inode(inode, &data->f_attr);
1121         if (ret)
1122                 goto err;
1123
1124         if (data->o_res.delegation_type != 0)
1125                 nfs4_opendata_check_deleg(data, state);
1126         update_open_stateid(state, &data->o_res.stateid, NULL,
1127                             data->o_arg.fmode);
1128
1129         return state;
1130 err:
1131         return ERR_PTR(ret);
1132
1133 }
1134
1135 static struct nfs4_state *
1136 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1137 {
1138         struct inode *inode;
1139         struct nfs4_state *state = NULL;
1140         int ret;
1141
1142         if (!data->rpc_done) {
1143                 state = nfs4_try_open_cached(data);
1144                 goto out;
1145         }
1146
1147         ret = -EAGAIN;
1148         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1149                 goto err;
1150         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1151         ret = PTR_ERR(inode);
1152         if (IS_ERR(inode))
1153                 goto err;
1154         ret = -ENOMEM;
1155         state = nfs4_get_open_state(inode, data->owner);
1156         if (state == NULL)
1157                 goto err_put_inode;
1158         if (data->o_res.delegation_type != 0)
1159                 nfs4_opendata_check_deleg(data, state);
1160         update_open_stateid(state, &data->o_res.stateid, NULL,
1161                         data->o_arg.fmode);
1162         iput(inode);
1163 out:
1164         nfs_release_seqid(data->o_arg.seqid);
1165         return state;
1166 err_put_inode:
1167         iput(inode);
1168 err:
1169         return ERR_PTR(ret);
1170 }
1171
1172 static struct nfs4_state *
1173 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1174 {
1175         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1176                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1177         return _nfs4_opendata_to_nfs4_state(data);
1178 }
1179
1180 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1181 {
1182         struct nfs_inode *nfsi = NFS_I(state->inode);
1183         struct nfs_open_context *ctx;
1184
1185         spin_lock(&state->inode->i_lock);
1186         list_for_each_entry(ctx, &nfsi->open_files, list) {
1187                 if (ctx->state != state)
1188                         continue;
1189                 get_nfs_open_context(ctx);
1190                 spin_unlock(&state->inode->i_lock);
1191                 return ctx;
1192         }
1193         spin_unlock(&state->inode->i_lock);
1194         return ERR_PTR(-ENOENT);
1195 }
1196
1197 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1198 {
1199         struct nfs4_opendata *opendata;
1200
1201         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1202         if (opendata == NULL)
1203                 return ERR_PTR(-ENOMEM);
1204         opendata->state = state;
1205         atomic_inc(&state->count);
1206         return opendata;
1207 }
1208
1209 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1210 {
1211         struct nfs4_state *newstate;
1212         int ret;
1213
1214         opendata->o_arg.open_flags = 0;
1215         opendata->o_arg.fmode = fmode;
1216         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1217         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1218         nfs4_init_opendata_res(opendata);
1219         ret = _nfs4_recover_proc_open(opendata);
1220         if (ret != 0)
1221                 return ret;
1222         newstate = nfs4_opendata_to_nfs4_state(opendata);
1223         if (IS_ERR(newstate))
1224                 return PTR_ERR(newstate);
1225         nfs4_close_state(newstate, fmode);
1226         *res = newstate;
1227         return 0;
1228 }
1229
1230 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1231 {
1232         struct nfs4_state *newstate;
1233         int ret;
1234
1235         /* memory barrier prior to reading state->n_* */
1236         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1237         smp_rmb();
1238         if (state->n_rdwr != 0) {
1239                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1240                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1241                 if (ret != 0)
1242                         return ret;
1243                 if (newstate != state)
1244                         return -ESTALE;
1245         }
1246         if (state->n_wronly != 0) {
1247                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1248                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1249                 if (ret != 0)
1250                         return ret;
1251                 if (newstate != state)
1252                         return -ESTALE;
1253         }
1254         if (state->n_rdonly != 0) {
1255                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1256                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1257                 if (ret != 0)
1258                         return ret;
1259                 if (newstate != state)
1260                         return -ESTALE;
1261         }
1262         /*
1263          * We may have performed cached opens for all three recoveries.
1264          * Check if we need to update the current stateid.
1265          */
1266         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1267             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1268                 write_seqlock(&state->seqlock);
1269                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1270                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1271                 write_sequnlock(&state->seqlock);
1272         }
1273         return 0;
1274 }
1275
1276 /*
1277  * OPEN_RECLAIM:
1278  *      reclaim state on the server after a reboot.
1279  */
1280 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1281 {
1282         struct nfs_delegation *delegation;
1283         struct nfs4_opendata *opendata;
1284         fmode_t delegation_type = 0;
1285         int status;
1286
1287         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1288         if (IS_ERR(opendata))
1289                 return PTR_ERR(opendata);
1290         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1291         opendata->o_arg.fh = NFS_FH(state->inode);
1292         rcu_read_lock();
1293         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1294         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1295                 delegation_type = delegation->type;
1296         rcu_read_unlock();
1297         opendata->o_arg.u.delegation_type = delegation_type;
1298         status = nfs4_open_recover(opendata, state);
1299         nfs4_opendata_put(opendata);
1300         return status;
1301 }
1302
1303 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1304 {
1305         struct nfs_server *server = NFS_SERVER(state->inode);
1306         struct nfs4_exception exception = { };
1307         int err;
1308         do {
1309                 err = _nfs4_do_open_reclaim(ctx, state);
1310                 if (err != -NFS4ERR_DELAY)
1311                         break;
1312                 nfs4_handle_exception(server, err, &exception);
1313         } while (exception.retry);
1314         return err;
1315 }
1316
1317 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1318 {
1319         struct nfs_open_context *ctx;
1320         int ret;
1321
1322         ctx = nfs4_state_find_open_context(state);
1323         if (IS_ERR(ctx))
1324                 return PTR_ERR(ctx);
1325         ret = nfs4_do_open_reclaim(ctx, state);
1326         put_nfs_open_context(ctx);
1327         return ret;
1328 }
1329
1330 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1331 {
1332         struct nfs4_opendata *opendata;
1333         int ret;
1334
1335         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1336         if (IS_ERR(opendata))
1337                 return PTR_ERR(opendata);
1338         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1339         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1340         ret = nfs4_open_recover(opendata, state);
1341         nfs4_opendata_put(opendata);
1342         return ret;
1343 }
1344
1345 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1346 {
1347         struct nfs4_exception exception = { };
1348         struct nfs_server *server = NFS_SERVER(state->inode);
1349         int err;
1350         do {
1351                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1352                 switch (err) {
1353                         case 0:
1354                         case -ENOENT:
1355                         case -ESTALE:
1356                                 goto out;
1357                         case -NFS4ERR_BADSESSION:
1358                         case -NFS4ERR_BADSLOT:
1359                         case -NFS4ERR_BAD_HIGH_SLOT:
1360                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1361                         case -NFS4ERR_DEADSESSION:
1362                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1363                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1364                                 err = -EAGAIN;
1365                                 goto out;
1366                         case -NFS4ERR_STALE_CLIENTID:
1367                         case -NFS4ERR_STALE_STATEID:
1368                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1369                         case -NFS4ERR_EXPIRED:
1370                                 /* Don't recall a delegation if it was lost */
1371                                 nfs4_schedule_lease_recovery(server->nfs_client);
1372                                 err = -EAGAIN;
1373                                 goto out;
1374                         case -NFS4ERR_DELEG_REVOKED:
1375                         case -NFS4ERR_ADMIN_REVOKED:
1376                         case -NFS4ERR_BAD_STATEID:
1377                                 nfs_inode_find_state_and_recover(state->inode,
1378                                                 stateid);
1379                                 nfs4_schedule_stateid_recovery(server, state);
1380                         case -ENOMEM:
1381                                 err = 0;
1382                                 goto out;
1383                 }
1384                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1385                 err = nfs4_handle_exception(server, err, &exception);
1386         } while (exception.retry);
1387 out:
1388         return err;
1389 }
1390
1391 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1392 {
1393         struct nfs4_opendata *data = calldata;
1394
1395         data->rpc_status = task->tk_status;
1396         if (data->rpc_status == 0) {
1397                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1398                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1399                 renew_lease(data->o_res.server, data->timestamp);
1400                 data->rpc_done = 1;
1401         }
1402 }
1403
1404 static void nfs4_open_confirm_release(void *calldata)
1405 {
1406         struct nfs4_opendata *data = calldata;
1407         struct nfs4_state *state = NULL;
1408
1409         /* If this request hasn't been cancelled, do nothing */
1410         if (data->cancelled == 0)
1411                 goto out_free;
1412         /* In case of error, no cleanup! */
1413         if (!data->rpc_done)
1414                 goto out_free;
1415         state = nfs4_opendata_to_nfs4_state(data);
1416         if (!IS_ERR(state))
1417                 nfs4_close_state(state, data->o_arg.fmode);
1418 out_free:
1419         nfs4_opendata_put(data);
1420 }
1421
1422 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1423         .rpc_call_done = nfs4_open_confirm_done,
1424         .rpc_release = nfs4_open_confirm_release,
1425 };
1426
1427 /*
1428  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1429  */
1430 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1431 {
1432         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1433         struct rpc_task *task;
1434         struct  rpc_message msg = {
1435                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1436                 .rpc_argp = &data->c_arg,
1437                 .rpc_resp = &data->c_res,
1438                 .rpc_cred = data->owner->so_cred,
1439         };
1440         struct rpc_task_setup task_setup_data = {
1441                 .rpc_client = server->client,
1442                 .rpc_message = &msg,
1443                 .callback_ops = &nfs4_open_confirm_ops,
1444                 .callback_data = data,
1445                 .workqueue = nfsiod_workqueue,
1446                 .flags = RPC_TASK_ASYNC,
1447         };
1448         int status;
1449
1450         kref_get(&data->kref);
1451         data->rpc_done = 0;
1452         data->rpc_status = 0;
1453         data->timestamp = jiffies;
1454         task = rpc_run_task(&task_setup_data);
1455         if (IS_ERR(task))
1456                 return PTR_ERR(task);
1457         status = nfs4_wait_for_completion_rpc_task(task);
1458         if (status != 0) {
1459                 data->cancelled = 1;
1460                 smp_wmb();
1461         } else
1462                 status = data->rpc_status;
1463         rpc_put_task(task);
1464         return status;
1465 }
1466
1467 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1468 {
1469         struct nfs4_opendata *data = calldata;
1470         struct nfs4_state_owner *sp = data->owner;
1471
1472         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1473                 goto out_wait;
1474         /*
1475          * Check if we still need to send an OPEN call, or if we can use
1476          * a delegation instead.
1477          */
1478         if (data->state != NULL) {
1479                 struct nfs_delegation *delegation;
1480
1481                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1482                         goto out_no_action;
1483                 rcu_read_lock();
1484                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1485                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1486                     can_open_delegated(delegation, data->o_arg.fmode))
1487                         goto unlock_no_action;
1488                 rcu_read_unlock();
1489         }
1490         /* Update client id. */
1491         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1492         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1493                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1494                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1495                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1496         }
1497         data->timestamp = jiffies;
1498         if (nfs4_setup_sequence(data->o_arg.server,
1499                                 &data->o_arg.seq_args,
1500                                 &data->o_res.seq_res,
1501                                 task) != 0)
1502                 nfs_release_seqid(data->o_arg.seqid);
1503         return;
1504 unlock_no_action:
1505         rcu_read_unlock();
1506 out_no_action:
1507         task->tk_action = NULL;
1508 out_wait:
1509         nfs4_sequence_done(task, &data->o_res.seq_res);
1510 }
1511
1512 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1513 {
1514         struct nfs4_opendata *data = calldata;
1515
1516         data->rpc_status = task->tk_status;
1517
1518         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1519                 return;
1520
1521         if (task->tk_status == 0) {
1522                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1523                         switch (data->o_res.f_attr->mode & S_IFMT) {
1524                         case S_IFREG:
1525                                 break;
1526                         case S_IFLNK:
1527                                 data->rpc_status = -ELOOP;
1528                                 break;
1529                         case S_IFDIR:
1530                                 data->rpc_status = -EISDIR;
1531                                 break;
1532                         default:
1533                                 data->rpc_status = -ENOTDIR;
1534                         }
1535                 }
1536                 renew_lease(data->o_res.server, data->timestamp);
1537                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1538                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1539         }
1540         data->rpc_done = 1;
1541 }
1542
1543 static void nfs4_open_release(void *calldata)
1544 {
1545         struct nfs4_opendata *data = calldata;
1546         struct nfs4_state *state = NULL;
1547
1548         /* If this request hasn't been cancelled, do nothing */
1549         if (data->cancelled == 0)
1550                 goto out_free;
1551         /* In case of error, no cleanup! */
1552         if (data->rpc_status != 0 || !data->rpc_done)
1553                 goto out_free;
1554         /* In case we need an open_confirm, no cleanup! */
1555         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1556                 goto out_free;
1557         state = nfs4_opendata_to_nfs4_state(data);
1558         if (!IS_ERR(state))
1559                 nfs4_close_state(state, data->o_arg.fmode);
1560 out_free:
1561         nfs4_opendata_put(data);
1562 }
1563
1564 static const struct rpc_call_ops nfs4_open_ops = {
1565         .rpc_call_prepare = nfs4_open_prepare,
1566         .rpc_call_done = nfs4_open_done,
1567         .rpc_release = nfs4_open_release,
1568 };
1569
1570 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1571 {
1572         struct inode *dir = data->dir->d_inode;
1573         struct nfs_server *server = NFS_SERVER(dir);
1574         struct nfs_openargs *o_arg = &data->o_arg;
1575         struct nfs_openres *o_res = &data->o_res;
1576         struct rpc_task *task;
1577         struct rpc_message msg = {
1578                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1579                 .rpc_argp = o_arg,
1580                 .rpc_resp = o_res,
1581                 .rpc_cred = data->owner->so_cred,
1582         };
1583         struct rpc_task_setup task_setup_data = {
1584                 .rpc_client = server->client,
1585                 .rpc_message = &msg,
1586                 .callback_ops = &nfs4_open_ops,
1587                 .callback_data = data,
1588                 .workqueue = nfsiod_workqueue,
1589                 .flags = RPC_TASK_ASYNC,
1590         };
1591         int status;
1592
1593         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1594         kref_get(&data->kref);
1595         data->rpc_done = 0;
1596         data->rpc_status = 0;
1597         data->cancelled = 0;
1598         if (isrecover)
1599                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1600         task = rpc_run_task(&task_setup_data);
1601         if (IS_ERR(task))
1602                 return PTR_ERR(task);
1603         status = nfs4_wait_for_completion_rpc_task(task);
1604         if (status != 0) {
1605                 data->cancelled = 1;
1606                 smp_wmb();
1607         } else
1608                 status = data->rpc_status;
1609         rpc_put_task(task);
1610
1611         return status;
1612 }
1613
1614 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1615 {
1616         struct inode *dir = data->dir->d_inode;
1617         struct nfs_openres *o_res = &data->o_res;
1618         int status;
1619
1620         status = nfs4_run_open_task(data, 1);
1621         if (status != 0 || !data->rpc_done)
1622                 return status;
1623
1624         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1625
1626         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1627                 status = _nfs4_proc_open_confirm(data);
1628                 if (status != 0)
1629                         return status;
1630         }
1631
1632         return status;
1633 }
1634
1635 static int nfs4_opendata_access(struct rpc_cred *cred,
1636                                 struct nfs4_opendata *opendata,
1637                                 struct nfs4_state *state, fmode_t fmode,
1638                                 int openflags)
1639 {
1640         struct nfs_access_entry cache;
1641         u32 mask;
1642
1643         /* access call failed or for some reason the server doesn't
1644          * support any access modes -- defer access call until later */
1645         if (opendata->o_res.access_supported == 0)
1646                 return 0;
1647
1648         mask = 0;
1649         /* don't check MAY_WRITE - a newly created file may not have
1650          * write mode bits, but POSIX allows the creating process to write.
1651          * use openflags to check for exec, because fmode won't
1652          * always have FMODE_EXEC set when file open for exec. */
1653         if (openflags & __FMODE_EXEC) {
1654                 /* ONLY check for exec rights */
1655                 mask = MAY_EXEC;
1656         } else if (fmode & FMODE_READ)
1657                 mask = MAY_READ;
1658
1659         cache.cred = cred;
1660         cache.jiffies = jiffies;
1661         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1662         nfs_access_add_cache(state->inode, &cache);
1663
1664         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1665                 return 0;
1666
1667         /* even though OPEN succeeded, access is denied. Close the file */
1668         nfs4_close_state(state, fmode);
1669         return -EACCES;
1670 }
1671
1672 /*
1673  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1674  */
1675 static int _nfs4_proc_open(struct nfs4_opendata *data)
1676 {
1677         struct inode *dir = data->dir->d_inode;
1678         struct nfs_server *server = NFS_SERVER(dir);
1679         struct nfs_openargs *o_arg = &data->o_arg;
1680         struct nfs_openres *o_res = &data->o_res;
1681         int status;
1682
1683         status = nfs4_run_open_task(data, 0);
1684         if (!data->rpc_done)
1685                 return status;
1686         if (status != 0) {
1687                 if (status == -NFS4ERR_BADNAME &&
1688                                 !(o_arg->open_flags & O_CREAT))
1689                         return -ENOENT;
1690                 return status;
1691         }
1692
1693         nfs_fattr_map_and_free_names(server, &data->f_attr);
1694
1695         if (o_arg->open_flags & O_CREAT)
1696                 update_changeattr(dir, &o_res->cinfo);
1697         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1698                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1699         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1700                 status = _nfs4_proc_open_confirm(data);
1701                 if (status != 0)
1702                         return status;
1703         }
1704         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1705                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1706         return 0;
1707 }
1708
1709 static int nfs4_recover_expired_lease(struct nfs_server *server)
1710 {
1711         return nfs4_client_recover_expired_lease(server->nfs_client);
1712 }
1713
1714 /*
1715  * OPEN_EXPIRED:
1716  *      reclaim state on the server after a network partition.
1717  *      Assumes caller holds the appropriate lock
1718  */
1719 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1720 {
1721         struct nfs4_opendata *opendata;
1722         int ret;
1723
1724         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1725         if (IS_ERR(opendata))
1726                 return PTR_ERR(opendata);
1727         ret = nfs4_open_recover(opendata, state);
1728         if (ret == -ESTALE)
1729                 d_drop(ctx->dentry);
1730         nfs4_opendata_put(opendata);
1731         return ret;
1732 }
1733
1734 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1735 {
1736         struct nfs_server *server = NFS_SERVER(state->inode);
1737         struct nfs4_exception exception = { };
1738         int err;
1739
1740         do {
1741                 err = _nfs4_open_expired(ctx, state);
1742                 switch (err) {
1743                 default:
1744                         goto out;
1745                 case -NFS4ERR_GRACE:
1746                 case -NFS4ERR_DELAY:
1747                         nfs4_handle_exception(server, err, &exception);
1748                         err = 0;
1749                 }
1750         } while (exception.retry);
1751 out:
1752         return err;
1753 }
1754
1755 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1756 {
1757         struct nfs_open_context *ctx;
1758         int ret;
1759
1760         ctx = nfs4_state_find_open_context(state);
1761         if (IS_ERR(ctx))
1762                 return PTR_ERR(ctx);
1763         ret = nfs4_do_open_expired(ctx, state);
1764         put_nfs_open_context(ctx);
1765         return ret;
1766 }
1767
1768 #if defined(CONFIG_NFS_V4_1)
1769 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1770 {
1771         struct nfs_server *server = NFS_SERVER(state->inode);
1772         nfs4_stateid *stateid = &state->stateid;
1773         int status;
1774
1775         /* If a state reset has been done, test_stateid is unneeded */
1776         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1777                 return;
1778
1779         status = nfs41_test_stateid(server, stateid);
1780         if (status != NFS_OK) {
1781                 /* Free the stateid unless the server explicitly
1782                  * informs us the stateid is unrecognized. */
1783                 if (status != -NFS4ERR_BAD_STATEID)
1784                         nfs41_free_stateid(server, stateid);
1785                 nfs_remove_bad_delegation(state->inode);
1786
1787                 write_seqlock(&state->seqlock);
1788                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1789                 write_sequnlock(&state->seqlock);
1790                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1791         }
1792 }
1793
1794 /**
1795  * nfs41_check_open_stateid - possibly free an open stateid
1796  *
1797  * @state: NFSv4 state for an inode
1798  *
1799  * Returns NFS_OK if recovery for this stateid is now finished.
1800  * Otherwise a negative NFS4ERR value is returned.
1801  */
1802 static int nfs41_check_open_stateid(struct nfs4_state *state)
1803 {
1804         struct nfs_server *server = NFS_SERVER(state->inode);
1805         nfs4_stateid *stateid = &state->open_stateid;
1806         int status;
1807
1808         /* If a state reset has been done, test_stateid is unneeded */
1809         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1810             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1811             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1812                 return -NFS4ERR_BAD_STATEID;
1813
1814         status = nfs41_test_stateid(server, stateid);
1815         if (status != NFS_OK) {
1816                 /* Free the stateid unless the server explicitly
1817                  * informs us the stateid is unrecognized. */
1818                 if (status != -NFS4ERR_BAD_STATEID)
1819                         nfs41_free_stateid(server, stateid);
1820
1821                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1822                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1823                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1824         }
1825         return status;
1826 }
1827
1828 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1829 {
1830         int status;
1831
1832         nfs41_clear_delegation_stateid(state);
1833         status = nfs41_check_open_stateid(state);
1834         if (status != NFS_OK)
1835                 status = nfs4_open_expired(sp, state);
1836         return status;
1837 }
1838 #endif
1839
1840 /*
1841  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1842  * fields corresponding to attributes that were used to store the verifier.
1843  * Make sure we clobber those fields in the later setattr call
1844  */
1845 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1846 {
1847         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1848             !(sattr->ia_valid & ATTR_ATIME_SET))
1849                 sattr->ia_valid |= ATTR_ATIME;
1850
1851         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1852             !(sattr->ia_valid & ATTR_MTIME_SET))
1853                 sattr->ia_valid |= ATTR_MTIME;
1854 }
1855
1856 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
1857                 fmode_t fmode,
1858                 int flags,
1859                 struct nfs4_state **res)
1860 {
1861         struct nfs4_state_owner *sp = opendata->owner;
1862         struct nfs_server *server = sp->so_server;
1863         struct nfs4_state *state;
1864         unsigned int seq;
1865         int ret;
1866
1867         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
1868
1869         ret = _nfs4_proc_open(opendata);
1870         if (ret != 0)
1871                 goto out;
1872
1873         state = nfs4_opendata_to_nfs4_state(opendata);
1874         ret = PTR_ERR(state);
1875         if (IS_ERR(state))
1876                 goto out;
1877         if (server->caps & NFS_CAP_POSIX_LOCK)
1878                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1879
1880         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
1881         if (ret != 0)
1882                 goto out;
1883
1884         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
1885                 nfs4_schedule_stateid_recovery(server, state);
1886                 nfs4_wait_clnt_recover(server->nfs_client);
1887         }
1888         *res = state;
1889 out:
1890         return ret;
1891 }
1892
1893 /*
1894  * Returns a referenced nfs4_state
1895  */
1896 static int _nfs4_do_open(struct inode *dir,
1897                         struct dentry *dentry,
1898                         fmode_t fmode,
1899                         int flags,
1900                         struct iattr *sattr,
1901                         struct rpc_cred *cred,
1902                         struct nfs4_state **res,
1903                         struct nfs4_threshold **ctx_th)
1904 {
1905         struct nfs4_state_owner  *sp;
1906         struct nfs4_state     *state = NULL;
1907         struct nfs_server       *server = NFS_SERVER(dir);
1908         struct nfs4_opendata *opendata;
1909         int status;
1910
1911         /* Protect against reboot recovery conflicts */
1912         status = -ENOMEM;
1913         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1914         if (sp == NULL) {
1915                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1916                 goto out_err;
1917         }
1918         status = nfs4_recover_expired_lease(server);
1919         if (status != 0)
1920                 goto err_put_state_owner;
1921         if (dentry->d_inode != NULL)
1922                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1923         status = -ENOMEM;
1924         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1925         if (opendata == NULL)
1926                 goto err_put_state_owner;
1927
1928         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1929                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1930                 if (!opendata->f_attr.mdsthreshold)
1931                         goto err_opendata_put;
1932                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1933         }
1934         if (dentry->d_inode != NULL)
1935                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1936
1937         status = _nfs4_open_and_get_state(opendata, fmode, flags, &state);
1938         if (status != 0)
1939                 goto err_opendata_put;
1940
1941         if (opendata->o_arg.open_flags & O_EXCL) {
1942                 nfs4_exclusive_attrset(opendata, sattr);
1943
1944                 nfs_fattr_init(opendata->o_res.f_attr);
1945                 status = nfs4_do_setattr(state->inode, cred,
1946                                 opendata->o_res.f_attr, sattr,
1947                                 state);
1948                 if (status == 0)
1949                         nfs_setattr_update_inode(state->inode, sattr);
1950                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1951         }
1952
1953         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1954                 *ctx_th = opendata->f_attr.mdsthreshold;
1955         else
1956                 kfree(opendata->f_attr.mdsthreshold);
1957         opendata->f_attr.mdsthreshold = NULL;
1958
1959         nfs4_opendata_put(opendata);
1960         nfs4_put_state_owner(sp);
1961         *res = state;
1962         return 0;
1963 err_opendata_put:
1964         kfree(opendata->f_attr.mdsthreshold);
1965         nfs4_opendata_put(opendata);
1966 err_put_state_owner:
1967         nfs4_put_state_owner(sp);
1968 out_err:
1969         *res = NULL;
1970         return status;
1971 }
1972
1973
1974 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1975                                         struct dentry *dentry,
1976                                         fmode_t fmode,
1977                                         int flags,
1978                                         struct iattr *sattr,
1979                                         struct rpc_cred *cred,
1980                                         struct nfs4_threshold **ctx_th)
1981 {
1982         struct nfs4_exception exception = { };
1983         struct nfs4_state *res;
1984         int status;
1985
1986         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1987         do {
1988                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1989                                        &res, ctx_th);
1990                 if (status == 0)
1991                         break;
1992                 /* NOTE: BAD_SEQID means the server and client disagree about the
1993                  * book-keeping w.r.t. state-changing operations
1994                  * (OPEN/CLOSE/LOCK/LOCKU...)
1995                  * It is actually a sign of a bug on the client or on the server.
1996                  *
1997                  * If we receive a BAD_SEQID error in the particular case of
1998                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1999                  * have unhashed the old state_owner for us, and that we can
2000                  * therefore safely retry using a new one. We should still warn
2001                  * the user though...
2002                  */
2003                 if (status == -NFS4ERR_BAD_SEQID) {
2004                         pr_warn_ratelimited("NFS: v4 server %s "
2005                                         " returned a bad sequence-id error!\n",
2006                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2007                         exception.retry = 1;
2008                         continue;
2009                 }
2010                 /*
2011                  * BAD_STATEID on OPEN means that the server cancelled our
2012                  * state before it received the OPEN_CONFIRM.
2013                  * Recover by retrying the request as per the discussion
2014                  * on Page 181 of RFC3530.
2015                  */
2016                 if (status == -NFS4ERR_BAD_STATEID) {
2017                         exception.retry = 1;
2018                         continue;
2019                 }
2020                 if (status == -EAGAIN) {
2021                         /* We must have found a delegation */
2022                         exception.retry = 1;
2023                         continue;
2024                 }
2025                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
2026                                         status, &exception));
2027         } while (exception.retry);
2028         return res;
2029 }
2030
2031 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2032                             struct nfs_fattr *fattr, struct iattr *sattr,
2033                             struct nfs4_state *state)
2034 {
2035         struct nfs_server *server = NFS_SERVER(inode);
2036         struct nfs_setattrargs  arg = {
2037                 .fh             = NFS_FH(inode),
2038                 .iap            = sattr,
2039                 .server         = server,
2040                 .bitmask = server->attr_bitmask,
2041         };
2042         struct nfs_setattrres  res = {
2043                 .fattr          = fattr,
2044                 .server         = server,
2045         };
2046         struct rpc_message msg = {
2047                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2048                 .rpc_argp       = &arg,
2049                 .rpc_resp       = &res,
2050                 .rpc_cred       = cred,
2051         };
2052         unsigned long timestamp = jiffies;
2053         int status;
2054
2055         nfs_fattr_init(fattr);
2056
2057         if (state != NULL) {
2058                 struct nfs_lockowner lockowner = {
2059                         .l_owner = current->files,
2060                         .l_pid = current->tgid,
2061                 };
2062                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2063                                 &lockowner);
2064         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2065                                 FMODE_WRITE)) {
2066                 /* Use that stateid */
2067         } else
2068                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2069
2070         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2071         if (status == 0 && state != NULL)
2072                 renew_lease(server, timestamp);
2073         return status;
2074 }
2075
2076 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2077                            struct nfs_fattr *fattr, struct iattr *sattr,
2078                            struct nfs4_state *state)
2079 {
2080         struct nfs_server *server = NFS_SERVER(inode);
2081         struct nfs4_exception exception = {
2082                 .state = state,
2083                 .inode = inode,
2084         };
2085         int err;
2086         do {
2087                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2088                 switch (err) {
2089                 case -NFS4ERR_OPENMODE:
2090                         if (state && !(state->state & FMODE_WRITE)) {
2091                                 err = -EBADF;
2092                                 if (sattr->ia_valid & ATTR_OPEN)
2093                                         err = -EACCES;
2094                                 goto out;
2095                         }
2096                 }
2097                 err = nfs4_handle_exception(server, err, &exception);
2098         } while (exception.retry);
2099 out:
2100         return err;
2101 }
2102
2103 struct nfs4_closedata {
2104         struct inode *inode;
2105         struct nfs4_state *state;
2106         struct nfs_closeargs arg;
2107         struct nfs_closeres res;
2108         struct nfs_fattr fattr;
2109         unsigned long timestamp;
2110         bool roc;
2111         u32 roc_barrier;
2112 };
2113
2114 static void nfs4_free_closedata(void *data)
2115 {
2116         struct nfs4_closedata *calldata = data;
2117         struct nfs4_state_owner *sp = calldata->state->owner;
2118         struct super_block *sb = calldata->state->inode->i_sb;
2119
2120         if (calldata->roc)
2121                 pnfs_roc_release(calldata->state->inode);
2122         nfs4_put_open_state(calldata->state);
2123         nfs_free_seqid(calldata->arg.seqid);
2124         nfs4_put_state_owner(sp);
2125         nfs_sb_deactive(sb);
2126         kfree(calldata);
2127 }
2128
2129 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2130                 fmode_t fmode)
2131 {
2132         spin_lock(&state->owner->so_lock);
2133         if (!(fmode & FMODE_READ))
2134                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2135         if (!(fmode & FMODE_WRITE))
2136                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2137         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2138         spin_unlock(&state->owner->so_lock);
2139 }
2140
2141 static void nfs4_close_done(struct rpc_task *task, void *data)
2142 {
2143         struct nfs4_closedata *calldata = data;
2144         struct nfs4_state *state = calldata->state;
2145         struct nfs_server *server = NFS_SERVER(calldata->inode);
2146
2147         dprintk("%s: begin!\n", __func__);
2148         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2149                 return;
2150         /* hmm. we are done with the inode, and in the process of freeing
2151          * the state_owner. we keep this around to process errors
2152          */
2153         switch (task->tk_status) {
2154                 case 0:
2155                         if (calldata->roc)
2156                                 pnfs_roc_set_barrier(state->inode,
2157                                                      calldata->roc_barrier);
2158                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2159                         renew_lease(server, calldata->timestamp);
2160                         nfs4_close_clear_stateid_flags(state,
2161                                         calldata->arg.fmode);
2162                         break;
2163                 case -NFS4ERR_STALE_STATEID:
2164                 case -NFS4ERR_OLD_STATEID:
2165                 case -NFS4ERR_BAD_STATEID:
2166                 case -NFS4ERR_EXPIRED:
2167                         if (calldata->arg.fmode == 0)
2168                                 break;
2169                 default:
2170                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2171                                 rpc_restart_call_prepare(task);
2172         }
2173         nfs_release_seqid(calldata->arg.seqid);
2174         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2175         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2176 }
2177
2178 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2179 {
2180         struct nfs4_closedata *calldata = data;
2181         struct nfs4_state *state = calldata->state;
2182         struct inode *inode = calldata->inode;
2183         int call_close = 0;
2184
2185         dprintk("%s: begin!\n", __func__);
2186         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2187                 goto out_wait;
2188
2189         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2190         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2191         spin_lock(&state->owner->so_lock);
2192         /* Calculate the change in open mode */
2193         if (state->n_rdwr == 0) {
2194                 if (state->n_rdonly == 0) {
2195                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2196                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2197                         calldata->arg.fmode &= ~FMODE_READ;
2198                 }
2199                 if (state->n_wronly == 0) {
2200                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2201                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2202                         calldata->arg.fmode &= ~FMODE_WRITE;
2203                 }
2204         }
2205         spin_unlock(&state->owner->so_lock);
2206
2207         if (!call_close) {
2208                 /* Note: exit _without_ calling nfs4_close_done */
2209                 goto out_no_action;
2210         }
2211
2212         if (calldata->arg.fmode == 0) {
2213                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2214                 if (calldata->roc &&
2215                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2216                         goto out_wait;
2217         }
2218
2219         nfs_fattr_init(calldata->res.fattr);
2220         calldata->timestamp = jiffies;
2221         if (nfs4_setup_sequence(NFS_SERVER(inode),
2222                                 &calldata->arg.seq_args,
2223                                 &calldata->res.seq_res,
2224                                 task) != 0)
2225                 nfs_release_seqid(calldata->arg.seqid);
2226         dprintk("%s: done!\n", __func__);
2227         return;
2228 out_no_action:
2229         task->tk_action = NULL;
2230 out_wait:
2231         nfs4_sequence_done(task, &calldata->res.seq_res);
2232 }
2233
2234 static const struct rpc_call_ops nfs4_close_ops = {
2235         .rpc_call_prepare = nfs4_close_prepare,
2236         .rpc_call_done = nfs4_close_done,
2237         .rpc_release = nfs4_free_closedata,
2238 };
2239
2240 /*
2241  * It is possible for data to be read/written from a mem-mapped file
2242  * after the sys_close call (which hits the vfs layer as a flush).
2243  * This means that we can't safely call nfsv4 close on a file until
2244  * the inode is cleared. This in turn means that we are not good
2245  * NFSv4 citizens - we do not indicate to the server to update the file's
2246  * share state even when we are done with one of the three share
2247  * stateid's in the inode.
2248  *
2249  * NOTE: Caller must be holding the sp->so_owner semaphore!
2250  */
2251 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2252 {
2253         struct nfs_server *server = NFS_SERVER(state->inode);
2254         struct nfs4_closedata *calldata;
2255         struct nfs4_state_owner *sp = state->owner;
2256         struct rpc_task *task;
2257         struct rpc_message msg = {
2258                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2259                 .rpc_cred = state->owner->so_cred,
2260         };
2261         struct rpc_task_setup task_setup_data = {
2262                 .rpc_client = server->client,
2263                 .rpc_message = &msg,
2264                 .callback_ops = &nfs4_close_ops,
2265                 .workqueue = nfsiod_workqueue,
2266                 .flags = RPC_TASK_ASYNC,
2267         };
2268         int status = -ENOMEM;
2269
2270         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2271         if (calldata == NULL)
2272                 goto out;
2273         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2274         calldata->inode = state->inode;
2275         calldata->state = state;
2276         calldata->arg.fh = NFS_FH(state->inode);
2277         calldata->arg.stateid = &state->open_stateid;
2278         /* Serialization for the sequence id */
2279         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2280         if (calldata->arg.seqid == NULL)
2281                 goto out_free_calldata;
2282         calldata->arg.fmode = 0;
2283         calldata->arg.bitmask = server->cache_consistency_bitmask;
2284         calldata->res.fattr = &calldata->fattr;
2285         calldata->res.seqid = calldata->arg.seqid;
2286         calldata->res.server = server;
2287         calldata->roc = pnfs_roc(state->inode);
2288         nfs_sb_active(calldata->inode->i_sb);
2289
2290         msg.rpc_argp = &calldata->arg;
2291         msg.rpc_resp = &calldata->res;
2292         task_setup_data.callback_data = calldata;
2293         task = rpc_run_task(&task_setup_data);
2294         if (IS_ERR(task))
2295                 return PTR_ERR(task);
2296         status = 0;
2297         if (wait)
2298                 status = rpc_wait_for_completion_task(task);
2299         rpc_put_task(task);
2300         return status;
2301 out_free_calldata:
2302         kfree(calldata);
2303 out:
2304         nfs4_put_open_state(state);
2305         nfs4_put_state_owner(sp);
2306         return status;
2307 }
2308
2309 static struct inode *
2310 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2311 {
2312         struct nfs4_state *state;
2313
2314         /* Protect against concurrent sillydeletes */
2315         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2316                              ctx->cred, &ctx->mdsthreshold);
2317         if (IS_ERR(state))
2318                 return ERR_CAST(state);
2319         ctx->state = state;
2320         return igrab(state->inode);
2321 }
2322
2323 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2324 {
2325         if (ctx->state == NULL)
2326                 return;
2327         if (is_sync)
2328                 nfs4_close_sync(ctx->state, ctx->mode);
2329         else
2330                 nfs4_close_state(ctx->state, ctx->mode);
2331 }
2332
2333 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2334 {
2335         struct nfs4_server_caps_arg args = {
2336                 .fhandle = fhandle,
2337         };
2338         struct nfs4_server_caps_res res = {};
2339         struct rpc_message msg = {
2340                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2341                 .rpc_argp = &args,
2342                 .rpc_resp = &res,
2343         };
2344         int status;
2345
2346         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2347         if (status == 0) {
2348                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2349                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2350                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2351                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2352                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2353                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2354                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2355                         server->caps |= NFS_CAP_ACLS;
2356                 if (res.has_links != 0)
2357                         server->caps |= NFS_CAP_HARDLINKS;
2358                 if (res.has_symlinks != 0)
2359                         server->caps |= NFS_CAP_SYMLINKS;
2360                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2361                         server->caps |= NFS_CAP_FILEID;
2362                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2363                         server->caps |= NFS_CAP_MODE;
2364                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2365                         server->caps |= NFS_CAP_NLINK;
2366                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2367                         server->caps |= NFS_CAP_OWNER;
2368                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2369                         server->caps |= NFS_CAP_OWNER_GROUP;
2370                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2371                         server->caps |= NFS_CAP_ATIME;
2372                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2373                         server->caps |= NFS_CAP_CTIME;
2374                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2375                         server->caps |= NFS_CAP_MTIME;
2376
2377                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2378                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2379                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2380                 server->acl_bitmask = res.acl_bitmask;
2381                 server->fh_expire_type = res.fh_expire_type;
2382         }
2383
2384         return status;
2385 }
2386
2387 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2388 {
2389         struct nfs4_exception exception = { };
2390         int err;
2391         do {
2392                 err = nfs4_handle_exception(server,
2393                                 _nfs4_server_capabilities(server, fhandle),
2394                                 &exception);
2395         } while (exception.retry);
2396         return err;
2397 }
2398
2399 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2400                 struct nfs_fsinfo *info)
2401 {
2402         struct nfs4_lookup_root_arg args = {
2403                 .bitmask = nfs4_fattr_bitmap,
2404         };
2405         struct nfs4_lookup_res res = {
2406                 .server = server,
2407                 .fattr = info->fattr,
2408                 .fh = fhandle,
2409         };
2410         struct rpc_message msg = {
2411                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2412                 .rpc_argp = &args,
2413                 .rpc_resp = &res,
2414         };
2415
2416         nfs_fattr_init(info->fattr);
2417         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2418 }
2419
2420 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2421                 struct nfs_fsinfo *info)
2422 {
2423         struct nfs4_exception exception = { };
2424         int err;
2425         do {
2426                 err = _nfs4_lookup_root(server, fhandle, info);
2427                 switch (err) {
2428                 case 0:
2429                 case -NFS4ERR_WRONGSEC:
2430                         goto out;
2431                 default:
2432                         err = nfs4_handle_exception(server, err, &exception);
2433                 }
2434         } while (exception.retry);
2435 out:
2436         return err;
2437 }
2438
2439 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2440                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2441 {
2442         struct rpc_auth *auth;
2443         int ret;
2444
2445         auth = rpcauth_create(flavor, server->client);
2446         if (IS_ERR(auth)) {
2447                 ret = -EIO;
2448                 goto out;
2449         }
2450         ret = nfs4_lookup_root(server, fhandle, info);
2451 out:
2452         return ret;
2453 }
2454
2455 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2456                               struct nfs_fsinfo *info)
2457 {
2458         int i, len, status = 0;
2459         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2460
2461         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2462         if (len < 0)
2463                 return len;
2464
2465         for (i = 0; i < len; i++) {
2466                 /* AUTH_UNIX is the default flavor if none was specified,
2467                  * thus has already been tried. */
2468                 if (flav_array[i] == RPC_AUTH_UNIX)
2469                         continue;
2470
2471                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2472                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2473                         continue;
2474                 break;
2475         }
2476         /*
2477          * -EACCESS could mean that the user doesn't have correct permissions
2478          * to access the mount.  It could also mean that we tried to mount
2479          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2480          * existing mount programs don't handle -EACCES very well so it should
2481          * be mapped to -EPERM instead.
2482          */
2483         if (status == -EACCES)
2484                 status = -EPERM;
2485         return status;
2486 }
2487
2488 /*
2489  * get the file handle for the "/" directory on the server
2490  */
2491 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2492                          struct nfs_fsinfo *info)
2493 {
2494         int minor_version = server->nfs_client->cl_minorversion;
2495         int status = nfs4_lookup_root(server, fhandle, info);
2496         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2497                 /*
2498                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2499                  * by nfs4_map_errors() as this function exits.
2500                  */
2501                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2502         if (status == 0)
2503                 status = nfs4_server_capabilities(server, fhandle);
2504         if (status == 0)
2505                 status = nfs4_do_fsinfo(server, fhandle, info);
2506         return nfs4_map_errors(status);
2507 }
2508
2509 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2510                               struct nfs_fsinfo *info)
2511 {
2512         int error;
2513         struct nfs_fattr *fattr = info->fattr;
2514
2515         error = nfs4_server_capabilities(server, mntfh);
2516         if (error < 0) {
2517                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2518                 return error;
2519         }
2520
2521         error = nfs4_proc_getattr(server, mntfh, fattr);
2522         if (error < 0) {
2523                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2524                 return error;
2525         }
2526
2527         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2528             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2529                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2530
2531         return error;
2532 }
2533
2534 /*
2535  * Get locations and (maybe) other attributes of a referral.
2536  * Note that we'll actually follow the referral later when
2537  * we detect fsid mismatch in inode revalidation
2538  */
2539 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2540                              const struct qstr *name, struct nfs_fattr *fattr,
2541                              struct nfs_fh *fhandle)
2542 {
2543         int status = -ENOMEM;
2544         struct page *page = NULL;
2545         struct nfs4_fs_locations *locations = NULL;
2546
2547         page = alloc_page(GFP_KERNEL);
2548         if (page == NULL)
2549                 goto out;
2550         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2551         if (locations == NULL)
2552                 goto out;
2553
2554         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2555         if (status != 0)
2556                 goto out;
2557         /* Make sure server returned a different fsid for the referral */
2558         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2559                 dprintk("%s: server did not return a different fsid for"
2560                         " a referral at %s\n", __func__, name->name);
2561                 status = -EIO;
2562                 goto out;
2563         }
2564         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2565         nfs_fixup_referral_attributes(&locations->fattr);
2566
2567         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2568         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2569         memset(fhandle, 0, sizeof(struct nfs_fh));
2570 out:
2571         if (page)
2572                 __free_page(page);
2573         kfree(locations);
2574         return status;
2575 }
2576
2577 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2578 {
2579         struct nfs4_getattr_arg args = {
2580                 .fh = fhandle,
2581                 .bitmask = server->attr_bitmask,
2582         };
2583         struct nfs4_getattr_res res = {
2584                 .fattr = fattr,
2585                 .server = server,
2586         };
2587         struct rpc_message msg = {
2588                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2589                 .rpc_argp = &args,
2590                 .rpc_resp = &res,
2591         };
2592
2593         nfs_fattr_init(fattr);
2594         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2595 }
2596
2597 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2598 {
2599         struct nfs4_exception exception = { };
2600         int err;
2601         do {
2602                 err = nfs4_handle_exception(server,
2603                                 _nfs4_proc_getattr(server, fhandle, fattr),
2604                                 &exception);
2605         } while (exception.retry);
2606         return err;
2607 }
2608
2609 /*
2610  * The file is not closed if it is opened due to the a request to change
2611  * the size of the file. The open call will not be needed once the
2612  * VFS layer lookup-intents are implemented.
2613  *
2614  * Close is called when the inode is destroyed.
2615  * If we haven't opened the file for O_WRONLY, we
2616  * need to in the size_change case to obtain a stateid.
2617  *
2618  * Got race?
2619  * Because OPEN is always done by name in nfsv4, it is
2620  * possible that we opened a different file by the same
2621  * name.  We can recognize this race condition, but we
2622  * can't do anything about it besides returning an error.
2623  *
2624  * This will be fixed with VFS changes (lookup-intent).
2625  */
2626 static int
2627 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2628                   struct iattr *sattr)
2629 {
2630         struct inode *inode = dentry->d_inode;
2631         struct rpc_cred *cred = NULL;
2632         struct nfs4_state *state = NULL;
2633         int status;
2634
2635         if (pnfs_ld_layoutret_on_setattr(inode))
2636                 pnfs_commit_and_return_layout(inode);
2637
2638         nfs_fattr_init(fattr);
2639
2640         /* Deal with open(O_TRUNC) */
2641         if (sattr->ia_valid & ATTR_OPEN)
2642                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2643
2644         /* Optimization: if the end result is no change, don't RPC */
2645         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2646                 return 0;
2647
2648         /* Search for an existing open(O_WRITE) file */
2649         if (sattr->ia_valid & ATTR_FILE) {
2650                 struct nfs_open_context *ctx;
2651
2652                 ctx = nfs_file_open_context(sattr->ia_file);
2653                 if (ctx) {
2654                         cred = ctx->cred;
2655                         state = ctx->state;
2656                 }
2657         }
2658
2659         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2660         if (status == 0)
2661                 nfs_setattr_update_inode(inode, sattr);
2662         return status;
2663 }
2664
2665 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2666                 const struct qstr *name, struct nfs_fh *fhandle,
2667                 struct nfs_fattr *fattr)
2668 {
2669         struct nfs_server *server = NFS_SERVER(dir);
2670         int                    status;
2671         struct nfs4_lookup_arg args = {
2672                 .bitmask = server->attr_bitmask,
2673                 .dir_fh = NFS_FH(dir),
2674                 .name = name,
2675         };
2676         struct nfs4_lookup_res res = {
2677                 .server = server,
2678                 .fattr = fattr,
2679                 .fh = fhandle,
2680         };
2681         struct rpc_message msg = {
2682                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2683                 .rpc_argp = &args,
2684                 .rpc_resp = &res,
2685         };
2686
2687         nfs_fattr_init(fattr);
2688
2689         dprintk("NFS call  lookup %s\n", name->name);
2690         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2691         dprintk("NFS reply lookup: %d\n", status);
2692         return status;
2693 }
2694
2695 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2696 {
2697         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2698                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2699         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2700         fattr->nlink = 2;
2701 }
2702
2703 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2704                                    struct qstr *name, struct nfs_fh *fhandle,
2705                                    struct nfs_fattr *fattr)
2706 {
2707         struct nfs4_exception exception = { };
2708         struct rpc_clnt *client = *clnt;
2709         int err;
2710         do {
2711                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2712                 switch (err) {
2713                 case -NFS4ERR_BADNAME:
2714                         err = -ENOENT;
2715                         goto out;
2716                 case -NFS4ERR_MOVED:
2717                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2718                         goto out;
2719                 case -NFS4ERR_WRONGSEC:
2720                         err = -EPERM;
2721                         if (client != *clnt)
2722                                 goto out;
2723
2724                         client = nfs4_create_sec_client(client, dir, name);
2725                         if (IS_ERR(client))
2726                                 return PTR_ERR(client);
2727
2728                         exception.retry = 1;
2729                         break;
2730                 default:
2731                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2732                 }
2733         } while (exception.retry);
2734
2735 out:
2736         if (err == 0)
2737                 *clnt = client;
2738         else if (client != *clnt)
2739                 rpc_shutdown_client(client);
2740
2741         return err;
2742 }
2743
2744 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2745                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2746 {
2747         int status;
2748         struct rpc_clnt *client = NFS_CLIENT(dir);
2749
2750         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2751         if (client != NFS_CLIENT(dir)) {
2752                 rpc_shutdown_client(client);
2753                 nfs_fixup_secinfo_attributes(fattr);
2754         }
2755         return status;
2756 }
2757
2758 struct rpc_clnt *
2759 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2760                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2761 {
2762         int status;
2763         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2764
2765         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2766         if (status < 0) {
2767                 rpc_shutdown_client(client);
2768                 return ERR_PTR(status);
2769         }
2770         return client;
2771 }
2772
2773 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2774 {
2775         struct nfs_server *server = NFS_SERVER(inode);
2776         struct nfs4_accessargs args = {
2777                 .fh = NFS_FH(inode),
2778                 .bitmask = server->cache_consistency_bitmask,
2779         };
2780         struct nfs4_accessres res = {
2781                 .server = server,
2782         };
2783         struct rpc_message msg = {
2784                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2785                 .rpc_argp = &args,
2786                 .rpc_resp = &res,
2787                 .rpc_cred = entry->cred,
2788         };
2789         int mode = entry->mask;
2790         int status;
2791
2792         /*
2793          * Determine which access bits we want to ask for...
2794          */
2795         if (mode & MAY_READ)
2796                 args.access |= NFS4_ACCESS_READ;
2797         if (S_ISDIR(inode->i_mode)) {
2798                 if (mode & MAY_WRITE)
2799                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2800                 if (mode & MAY_EXEC)
2801                         args.access |= NFS4_ACCESS_LOOKUP;
2802         } else {
2803                 if (mode & MAY_WRITE)
2804                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2805                 if (mode & MAY_EXEC)
2806                         args.access |= NFS4_ACCESS_EXECUTE;
2807         }
2808
2809         res.fattr = nfs_alloc_fattr();
2810         if (res.fattr == NULL)
2811                 return -ENOMEM;
2812
2813         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2814         if (!status) {
2815                 nfs_access_set_mask(entry, res.access);
2816                 nfs_refresh_inode(inode, res.fattr);
2817         }
2818         nfs_free_fattr(res.fattr);
2819         return status;
2820 }
2821
2822 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2823 {
2824         struct nfs4_exception exception = { };
2825         int err;
2826         do {
2827                 err = nfs4_handle_exception(NFS_SERVER(inode),
2828                                 _nfs4_proc_access(inode, entry),
2829                                 &exception);
2830         } while (exception.retry);
2831         return err;
2832 }
2833
2834 /*
2835  * TODO: For the time being, we don't try to get any attributes
2836  * along with any of the zero-copy operations READ, READDIR,
2837  * READLINK, WRITE.
2838  *
2839  * In the case of the first three, we want to put the GETATTR
2840  * after the read-type operation -- this is because it is hard
2841  * to predict the length of a GETATTR response in v4, and thus
2842  * align the READ data correctly.  This means that the GETATTR
2843  * may end up partially falling into the page cache, and we should
2844  * shift it into the 'tail' of the xdr_buf before processing.
2845  * To do this efficiently, we need to know the total length
2846  * of data received, which doesn't seem to be available outside
2847  * of the RPC layer.
2848  *
2849  * In the case of WRITE, we also want to put the GETATTR after
2850  * the operation -- in this case because we want to make sure
2851  * we get the post-operation mtime and size.
2852  *
2853  * Both of these changes to the XDR layer would in fact be quite
2854  * minor, but I decided to leave them for a subsequent patch.
2855  */
2856 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2857                 unsigned int pgbase, unsigned int pglen)
2858 {
2859         struct nfs4_readlink args = {
2860                 .fh       = NFS_FH(inode),
2861                 .pgbase   = pgbase,
2862                 .pglen    = pglen,
2863                 .pages    = &page,
2864         };
2865         struct nfs4_readlink_res res;
2866         struct rpc_message msg = {
2867                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2868                 .rpc_argp = &args,
2869                 .rpc_resp = &res,
2870         };
2871
2872         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2873 }
2874
2875 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2876                 unsigned int pgbase, unsigned int pglen)
2877 {
2878         struct nfs4_exception exception = { };
2879         int err;
2880         do {
2881                 err = nfs4_handle_exception(NFS_SERVER(inode),
2882                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2883                                 &exception);
2884         } while (exception.retry);
2885         return err;
2886 }
2887
2888 /*
2889  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2890  */
2891 static int
2892 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2893                  int flags)
2894 {
2895         struct nfs_open_context *ctx;
2896         struct nfs4_state *state;
2897         int status = 0;
2898
2899         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2900         if (IS_ERR(ctx))
2901                 return PTR_ERR(ctx);
2902
2903         sattr->ia_mode &= ~current_umask();
2904         state = nfs4_do_open(dir, dentry, ctx->mode,
2905                         flags, sattr, ctx->cred,
2906                         &ctx->mdsthreshold);
2907         d_drop(dentry);
2908         if (IS_ERR(state)) {
2909                 status = PTR_ERR(state);
2910                 goto out;
2911         }
2912         d_add(dentry, igrab(state->inode));
2913         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2914         ctx->state = state;
2915 out:
2916         put_nfs_open_context(ctx);
2917         return status;
2918 }
2919
2920 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2921 {
2922         struct nfs_server *server = NFS_SERVER(dir);
2923         struct nfs_removeargs args = {
2924                 .fh = NFS_FH(dir),
2925                 .name = *name,
2926         };
2927         struct nfs_removeres res = {
2928                 .server = server,
2929         };
2930         struct rpc_message msg = {
2931                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2932                 .rpc_argp = &args,
2933                 .rpc_resp = &res,
2934         };
2935         int status;
2936
2937         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2938         if (status == 0)
2939                 update_changeattr(dir, &res.cinfo);
2940         return status;
2941 }
2942
2943 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2944 {
2945         struct nfs4_exception exception = { };
2946         int err;
2947         do {
2948                 err = nfs4_handle_exception(NFS_SERVER(dir),
2949                                 _nfs4_proc_remove(dir, name),
2950                                 &exception);
2951         } while (exception.retry);
2952         return err;
2953 }
2954
2955 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2956 {
2957         struct nfs_server *server = NFS_SERVER(dir);
2958         struct nfs_removeargs *args = msg->rpc_argp;
2959         struct nfs_removeres *res = msg->rpc_resp;
2960
2961         res->server = server;
2962         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2963         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2964 }
2965
2966 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2967 {
2968         nfs4_setup_sequence(NFS_SERVER(data->dir),
2969                         &data->args.seq_args,
2970                         &data->res.seq_res,
2971                         task);
2972 }
2973
2974 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2975 {
2976         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2977
2978         if (!nfs4_sequence_done(task, &res->seq_res))
2979                 return 0;
2980         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2981                 return 0;
2982         update_changeattr(dir, &res->cinfo);
2983         return 1;
2984 }
2985
2986 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2987 {
2988         struct nfs_server *server = NFS_SERVER(dir);
2989         struct nfs_renameargs *arg = msg->rpc_argp;
2990         struct nfs_renameres *res = msg->rpc_resp;
2991
2992         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2993         res->server = server;
2994         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2995 }
2996
2997 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2998 {
2999         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3000                         &data->args.seq_args,
3001                         &data->res.seq_res,
3002                         task);
3003 }
3004
3005 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3006                                  struct inode *new_dir)
3007 {
3008         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3009
3010         if (!nfs4_sequence_done(task, &res->seq_res))
3011                 return 0;
3012         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3013                 return 0;
3014
3015         update_changeattr(old_dir, &res->old_cinfo);
3016         update_changeattr(new_dir, &res->new_cinfo);
3017         return 1;
3018 }
3019
3020 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3021                 struct inode *new_dir, struct qstr *new_name)
3022 {
3023         struct nfs_server *server = NFS_SERVER(old_dir);
3024         struct nfs_renameargs arg = {
3025                 .old_dir = NFS_FH(old_dir),
3026                 .new_dir = NFS_FH(new_dir),
3027                 .old_name = old_name,
3028                 .new_name = new_name,
3029         };
3030         struct nfs_renameres res = {
3031                 .server = server,
3032         };
3033         struct rpc_message msg = {
3034                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3035                 .rpc_argp = &arg,
3036                 .rpc_resp = &res,
3037         };
3038         int status = -ENOMEM;
3039
3040         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3041         if (!status) {
3042                 update_changeattr(old_dir, &res.old_cinfo);
3043                 update_changeattr(new_dir, &res.new_cinfo);
3044         }
3045         return status;
3046 }
3047
3048 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3049                 struct inode *new_dir, struct qstr *new_name)
3050 {
3051         struct nfs4_exception exception = { };
3052         int err;
3053         do {
3054                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3055                                 _nfs4_proc_rename(old_dir, old_name,
3056                                         new_dir, new_name),
3057                                 &exception);
3058         } while (exception.retry);
3059         return err;
3060 }
3061
3062 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3063 {
3064         struct nfs_server *server = NFS_SERVER(inode);
3065         struct nfs4_link_arg arg = {
3066                 .fh     = NFS_FH(inode),
3067                 .dir_fh = NFS_FH(dir),
3068                 .name   = name,
3069                 .bitmask = server->attr_bitmask,
3070         };
3071         struct nfs4_link_res res = {
3072                 .server = server,
3073         };
3074         struct rpc_message msg = {
3075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3076                 .rpc_argp = &arg,
3077                 .rpc_resp = &res,
3078         };
3079         int status = -ENOMEM;
3080
3081         res.fattr = nfs_alloc_fattr();
3082         if (res.fattr == NULL)
3083                 goto out;
3084
3085         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3086         if (!status) {
3087                 update_changeattr(dir, &res.cinfo);
3088                 nfs_post_op_update_inode(inode, res.fattr);
3089         }
3090 out:
3091         nfs_free_fattr(res.fattr);
3092         return status;
3093 }
3094
3095 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3096 {
3097         struct nfs4_exception exception = { };
3098         int err;
3099         do {
3100                 err = nfs4_handle_exception(NFS_SERVER(inode),
3101                                 _nfs4_proc_link(inode, dir, name),
3102                                 &exception);
3103         } while (exception.retry);
3104         return err;
3105 }
3106
3107 struct nfs4_createdata {
3108         struct rpc_message msg;
3109         struct nfs4_create_arg arg;
3110         struct nfs4_create_res res;
3111         struct nfs_fh fh;
3112         struct nfs_fattr fattr;
3113 };
3114
3115 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3116                 struct qstr *name, struct iattr *sattr, u32 ftype)
3117 {
3118         struct nfs4_createdata *data;
3119
3120         data = kzalloc(sizeof(*data), GFP_KERNEL);
3121         if (data != NULL) {
3122                 struct nfs_server *server = NFS_SERVER(dir);
3123
3124                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3125                 data->msg.rpc_argp = &data->arg;
3126                 data->msg.rpc_resp = &data->res;
3127                 data->arg.dir_fh = NFS_FH(dir);
3128                 data->arg.server = server;
3129                 data->arg.name = name;
3130                 data->arg.attrs = sattr;
3131                 data->arg.ftype = ftype;
3132                 data->arg.bitmask = server->attr_bitmask;
3133                 data->res.server = server;
3134                 data->res.fh = &data->fh;
3135                 data->res.fattr = &data->fattr;
3136                 nfs_fattr_init(data->res.fattr);
3137         }
3138         return data;
3139 }
3140
3141 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3142 {
3143         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3144                                     &data->arg.seq_args, &data->res.seq_res, 1);
3145         if (status == 0) {
3146                 update_changeattr(dir, &data->res.dir_cinfo);
3147                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3148         }
3149         return status;
3150 }
3151
3152 static void nfs4_free_createdata(struct nfs4_createdata *data)
3153 {
3154         kfree(data);
3155 }
3156
3157 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3158                 struct page *page, unsigned int len, struct iattr *sattr)
3159 {
3160         struct nfs4_createdata *data;
3161         int status = -ENAMETOOLONG;
3162
3163         if (len > NFS4_MAXPATHLEN)
3164                 goto out;
3165
3166         status = -ENOMEM;
3167         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3168         if (data == NULL)
3169                 goto out;
3170
3171         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3172         data->arg.u.symlink.pages = &page;
3173         data->arg.u.symlink.len = len;
3174
3175         status = nfs4_do_create(dir, dentry, data);
3176
3177         nfs4_free_createdata(data);
3178 out:
3179         return status;
3180 }
3181
3182 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3183                 struct page *page, unsigned int len, struct iattr *sattr)
3184 {
3185         struct nfs4_exception exception = { };
3186         int err;
3187         do {
3188                 err = nfs4_handle_exception(NFS_SERVER(dir),
3189                                 _nfs4_proc_symlink(dir, dentry, page,
3190                                                         len, sattr),
3191                                 &exception);
3192         } while (exception.retry);
3193         return err;
3194 }
3195
3196 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3197                 struct iattr *sattr)
3198 {
3199         struct nfs4_createdata *data;
3200         int status = -ENOMEM;
3201
3202         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3203         if (data == NULL)
3204                 goto out;
3205
3206         status = nfs4_do_create(dir, dentry, data);
3207
3208         nfs4_free_createdata(data);
3209 out:
3210         return status;
3211 }
3212
3213 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3214                 struct iattr *sattr)
3215 {
3216         struct nfs4_exception exception = { };
3217         int err;
3218
3219         sattr->ia_mode &= ~current_umask();
3220         do {
3221                 err = nfs4_handle_exception(NFS_SERVER(dir),
3222                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3223                                 &exception);
3224         } while (exception.retry);
3225         return err;
3226 }
3227
3228 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3229                 u64 cookie, struct page **pages, unsigned int count, int plus)
3230 {
3231         struct inode            *dir = dentry->d_inode;
3232         struct nfs4_readdir_arg args = {
3233                 .fh = NFS_FH(dir),
3234                 .pages = pages,
3235                 .pgbase = 0,
3236                 .count = count,
3237                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3238                 .plus = plus,
3239         };
3240         struct nfs4_readdir_res res;
3241         struct rpc_message msg = {
3242                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3243                 .rpc_argp = &args,
3244                 .rpc_resp = &res,
3245                 .rpc_cred = cred,
3246         };
3247         int                     status;
3248
3249         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3250                         dentry->d_parent->d_name.name,
3251                         dentry->d_name.name,
3252                         (unsigned long long)cookie);
3253         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3254         res.pgbase = args.pgbase;
3255         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3256         if (status >= 0) {
3257                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3258                 status += args.pgbase;
3259         }
3260
3261         nfs_invalidate_atime(dir);
3262
3263         dprintk("%s: returns %d\n", __func__, status);
3264         return status;
3265 }
3266
3267 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3268                 u64 cookie, struct page **pages, unsigned int count, int plus)
3269 {
3270         struct nfs4_exception exception = { };
3271         int err;
3272         do {
3273                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3274                                 _nfs4_proc_readdir(dentry, cred, cookie,
3275                                         pages, count, plus),
3276                                 &exception);
3277         } while (exception.retry);
3278         return err;
3279 }
3280
3281 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3282                 struct iattr *sattr, dev_t rdev)
3283 {
3284         struct nfs4_createdata *data;
3285         int mode = sattr->ia_mode;
3286         int status = -ENOMEM;
3287
3288         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3289         if (data == NULL)
3290                 goto out;
3291
3292         if (S_ISFIFO(mode))
3293                 data->arg.ftype = NF4FIFO;
3294         else if (S_ISBLK(mode)) {
3295                 data->arg.ftype = NF4BLK;
3296                 data->arg.u.device.specdata1 = MAJOR(rdev);
3297                 data->arg.u.device.specdata2 = MINOR(rdev);
3298         }
3299         else if (S_ISCHR(mode)) {
3300                 data->arg.ftype = NF4CHR;
3301                 data->arg.u.device.specdata1 = MAJOR(rdev);
3302                 data->arg.u.device.specdata2 = MINOR(rdev);
3303         } else if (!S_ISSOCK(mode)) {
3304                 status = -EINVAL;
3305                 goto out_free;
3306         }
3307
3308         status = nfs4_do_create(dir, dentry, data);
3309 out_free:
3310         nfs4_free_createdata(data);
3311 out:
3312         return status;
3313 }
3314
3315 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3316                 struct iattr *sattr, dev_t rdev)
3317 {
3318         struct nfs4_exception exception = { };
3319         int err;
3320
3321         sattr->ia_mode &= ~current_umask();
3322         do {
3323                 err = nfs4_handle_exception(NFS_SERVER(dir),
3324                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3325                                 &exception);
3326         } while (exception.retry);
3327         return err;
3328 }
3329
3330 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3331                  struct nfs_fsstat *fsstat)
3332 {
3333         struct nfs4_statfs_arg args = {
3334                 .fh = fhandle,
3335                 .bitmask = server->attr_bitmask,
3336         };
3337         struct nfs4_statfs_res res = {
3338                 .fsstat = fsstat,
3339         };
3340         struct rpc_message msg = {
3341                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3342                 .rpc_argp = &args,
3343                 .rpc_resp = &res,
3344         };
3345
3346         nfs_fattr_init(fsstat->fattr);
3347         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3348 }
3349
3350 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3351 {
3352         struct nfs4_exception exception = { };
3353         int err;
3354         do {
3355                 err = nfs4_handle_exception(server,
3356                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3357                                 &exception);
3358         } while (exception.retry);
3359         return err;
3360 }
3361
3362 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3363                 struct nfs_fsinfo *fsinfo)
3364 {
3365         struct nfs4_fsinfo_arg args = {
3366                 .fh = fhandle,
3367                 .bitmask = server->attr_bitmask,
3368         };
3369         struct nfs4_fsinfo_res res = {
3370                 .fsinfo = fsinfo,
3371         };
3372         struct rpc_message msg = {
3373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3374                 .rpc_argp = &args,
3375                 .rpc_resp = &res,
3376         };
3377
3378         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3379 }
3380
3381 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3382 {
3383         struct nfs4_exception exception = { };
3384         int err;
3385
3386         do {
3387                 err = nfs4_handle_exception(server,
3388                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3389                                 &exception);
3390         } while (exception.retry);
3391         return err;
3392 }
3393
3394 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3395 {
3396         int error;
3397
3398         nfs_fattr_init(fsinfo->fattr);
3399         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3400         if (error == 0) {
3401                 /* block layout checks this! */
3402                 server->pnfs_blksize = fsinfo->blksize;
3403                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3404         }
3405
3406         return error;
3407 }
3408
3409 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3410                 struct nfs_pathconf *pathconf)
3411 {
3412         struct nfs4_pathconf_arg args = {
3413                 .fh = fhandle,
3414                 .bitmask = server->attr_bitmask,
3415         };
3416         struct nfs4_pathconf_res res = {
3417                 .pathconf = pathconf,
3418         };
3419         struct rpc_message msg = {
3420                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3421                 .rpc_argp = &args,
3422                 .rpc_resp = &res,
3423         };
3424
3425         /* None of the pathconf attributes are mandatory to implement */
3426         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3427                 memset(pathconf, 0, sizeof(*pathconf));
3428                 return 0;
3429         }
3430
3431         nfs_fattr_init(pathconf->fattr);
3432         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3433 }
3434
3435 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3436                 struct nfs_pathconf *pathconf)
3437 {
3438         struct nfs4_exception exception = { };
3439         int err;
3440
3441         do {
3442                 err = nfs4_handle_exception(server,
3443                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3444                                 &exception);
3445         } while (exception.retry);
3446         return err;
3447 }
3448
3449 void __nfs4_read_done_cb(struct nfs_read_data *data)
3450 {
3451         nfs_invalidate_atime(data->header->inode);
3452 }
3453
3454 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3455 {
3456         struct nfs_server *server = NFS_SERVER(data->header->inode);
3457
3458         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3459                 rpc_restart_call_prepare(task);
3460                 return -EAGAIN;
3461         }
3462
3463         __nfs4_read_done_cb(data);
3464         if (task->tk_status > 0)
3465                 renew_lease(server, data->timestamp);
3466         return 0;
3467 }
3468
3469 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3470 {
3471
3472         dprintk("--> %s\n", __func__);
3473
3474         if (!nfs4_sequence_done(task, &data->res.seq_res))
3475                 return -EAGAIN;
3476
3477         return data->read_done_cb ? data->read_done_cb(task, data) :
3478                                     nfs4_read_done_cb(task, data);
3479 }
3480
3481 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3482 {
3483         data->timestamp   = jiffies;
3484         data->read_done_cb = nfs4_read_done_cb;
3485         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3486         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3487 }
3488
3489 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3490 {
3491         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3492                         &data->args.seq_args,
3493                         &data->res.seq_res,
3494                         task);
3495 }
3496
3497 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3498 {
3499         struct inode *inode = data->header->inode;
3500
3501         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3502                 rpc_restart_call_prepare(task);
3503                 return -EAGAIN;
3504         }
3505         if (task->tk_status >= 0) {
3506                 renew_lease(NFS_SERVER(inode), data->timestamp);
3507                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3508         }
3509         return 0;
3510 }
3511
3512 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3513 {
3514         if (!nfs4_sequence_done(task, &data->res.seq_res))
3515                 return -EAGAIN;
3516         return data->write_done_cb ? data->write_done_cb(task, data) :
3517                 nfs4_write_done_cb(task, data);
3518 }
3519
3520 static
3521 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3522 {
3523         const struct nfs_pgio_header *hdr = data->header;
3524
3525         /* Don't request attributes for pNFS or O_DIRECT writes */
3526         if (data->ds_clp != NULL || hdr->dreq != NULL)
3527                 return false;
3528         /* Otherwise, request attributes if and only if we don't hold
3529          * a delegation
3530          */
3531         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3532 }
3533
3534 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3535 {
3536         struct nfs_server *server = NFS_SERVER(data->header->inode);
3537
3538         if (!nfs4_write_need_cache_consistency_data(data)) {
3539                 data->args.bitmask = NULL;
3540                 data->res.fattr = NULL;
3541         } else
3542                 data->args.bitmask = server->cache_consistency_bitmask;
3543
3544         if (!data->write_done_cb)
3545                 data->write_done_cb = nfs4_write_done_cb;
3546         data->res.server = server;
3547         data->timestamp   = jiffies;
3548
3549         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3550         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3551 }
3552
3553 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3554 {
3555         nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3556                         &data->args.seq_args,
3557                         &data->res.seq_res,
3558                         task);
3559 }
3560
3561 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3562 {
3563         nfs4_setup_sequence(NFS_SERVER(data->inode),
3564                         &data->args.seq_args,
3565                         &data->res.seq_res,
3566                         task);
3567 }
3568
3569 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3570 {
3571         struct inode *inode = data->inode;
3572
3573         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3574                 rpc_restart_call_prepare(task);
3575                 return -EAGAIN;
3576         }
3577         return 0;
3578 }
3579
3580 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3581 {
3582         if (!nfs4_sequence_done(task, &data->res.seq_res))
3583                 return -EAGAIN;
3584         return data->commit_done_cb(task, data);
3585 }
3586
3587 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3588 {
3589         struct nfs_server *server = NFS_SERVER(data->inode);
3590
3591         if (data->commit_done_cb == NULL)
3592                 data->commit_done_cb = nfs4_commit_done_cb;
3593         data->res.server = server;
3594         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3595         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3596 }
3597
3598 struct nfs4_renewdata {
3599         struct nfs_client       *client;
3600         unsigned long           timestamp;
3601 };
3602
3603 /*
3604  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3605  * standalone procedure for queueing an asynchronous RENEW.
3606  */
3607 static void nfs4_renew_release(void *calldata)
3608 {
3609         struct nfs4_renewdata *data = calldata;
3610         struct nfs_client *clp = data->client;
3611
3612         if (atomic_read(&clp->cl_count) > 1)
3613                 nfs4_schedule_state_renewal(clp);
3614         nfs_put_client(clp);
3615         kfree(data);
3616 }
3617
3618 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3619 {
3620         struct nfs4_renewdata *data = calldata;
3621         struct nfs_client *clp = data->client;
3622         unsigned long timestamp = data->timestamp;
3623
3624         if (task->tk_status < 0) {
3625                 /* Unless we're shutting down, schedule state recovery! */
3626                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3627                         return;
3628                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3629                         nfs4_schedule_lease_recovery(clp);
3630                         return;
3631                 }
3632                 nfs4_schedule_path_down_recovery(clp);
3633         }
3634         do_renew_lease(clp, timestamp);
3635 }
3636
3637 static const struct rpc_call_ops nfs4_renew_ops = {
3638         .rpc_call_done = nfs4_renew_done,
3639         .rpc_release = nfs4_renew_release,
3640 };
3641
3642 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3643 {
3644         struct rpc_message msg = {
3645                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3646                 .rpc_argp       = clp,
3647                 .rpc_cred       = cred,
3648         };
3649         struct nfs4_renewdata *data;
3650
3651         if (renew_flags == 0)
3652                 return 0;
3653         if (!atomic_inc_not_zero(&clp->cl_count))
3654                 return -EIO;
3655         data = kmalloc(sizeof(*data), GFP_NOFS);
3656         if (data == NULL)
3657                 return -ENOMEM;
3658         data->client = clp;
3659         data->timestamp = jiffies;
3660         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3661                         &nfs4_renew_ops, data);
3662 }
3663
3664 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3665 {
3666         struct rpc_message msg = {
3667                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3668                 .rpc_argp       = clp,
3669                 .rpc_cred       = cred,
3670         };
3671         unsigned long now = jiffies;
3672         int status;
3673
3674         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3675         if (status < 0)
3676                 return status;
3677         do_renew_lease(clp, now);
3678         return 0;
3679 }
3680
3681 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3682 {
3683         return (server->caps & NFS_CAP_ACLS)
3684                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3685                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3686 }
3687
3688 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3689  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3690  * the stack.
3691  */
3692 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3693
3694 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3695                 struct page **pages, unsigned int *pgbase)
3696 {
3697         struct page *newpage, **spages;
3698         int rc = 0;
3699         size_t len;
3700         spages = pages;
3701
3702         do {
3703                 len = min_t(size_t, PAGE_SIZE, buflen);
3704                 newpage = alloc_page(GFP_KERNEL);
3705
3706                 if (newpage == NULL)
3707                         goto unwind;
3708                 memcpy(page_address(newpage), buf, len);
3709                 buf += len;
3710                 buflen -= len;
3711                 *pages++ = newpage;
3712                 rc++;
3713         } while (buflen != 0);
3714
3715         return rc;
3716
3717 unwind:
3718         for(; rc > 0; rc--)
3719                 __free_page(spages[rc-1]);
3720         return -ENOMEM;
3721 }
3722
3723 struct nfs4_cached_acl {
3724         int cached;
3725         size_t len;
3726         char data[0];
3727 };
3728
3729 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3730 {
3731         struct nfs_inode *nfsi = NFS_I(inode);
3732
3733         spin_lock(&inode->i_lock);
3734         kfree(nfsi->nfs4_acl);
3735         nfsi->nfs4_acl = acl;
3736         spin_unlock(&inode->i_lock);
3737 }
3738
3739 static void nfs4_zap_acl_attr(struct inode *inode)
3740 {
3741         nfs4_set_cached_acl(inode, NULL);
3742 }
3743
3744 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3745 {
3746         struct nfs_inode *nfsi = NFS_I(inode);
3747         struct nfs4_cached_acl *acl;
3748         int ret = -ENOENT;
3749
3750         spin_lock(&inode->i_lock);
3751         acl = nfsi->nfs4_acl;
3752         if (acl == NULL)
3753                 goto out;
3754         if (buf == NULL) /* user is just asking for length */
3755                 goto out_len;
3756         if (acl->cached == 0)
3757                 goto out;
3758         ret = -ERANGE; /* see getxattr(2) man page */
3759         if (acl->len > buflen)
3760                 goto out;
3761         memcpy(buf, acl->data, acl->len);
3762 out_len:
3763         ret = acl->len;
3764 out:
3765         spin_unlock(&inode->i_lock);
3766         return ret;
3767 }
3768
3769 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3770 {
3771         struct nfs4_cached_acl *acl;
3772         size_t buflen = sizeof(*acl) + acl_len;
3773
3774         if (buflen <= PAGE_SIZE) {
3775                 acl = kmalloc(buflen, GFP_KERNEL);
3776                 if (acl == NULL)
3777                         goto out;
3778                 acl->cached = 1;
3779                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3780         } else {
3781                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3782                 if (acl == NULL)
3783                         goto out;
3784                 acl->cached = 0;
3785         }
3786         acl->len = acl_len;
3787 out:
3788         nfs4_set_cached_acl(inode, acl);
3789 }
3790
3791 /*
3792  * The getxattr API returns the required buffer length when called with a
3793  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3794  * the required buf.  On a NULL buf, we send a page of data to the server
3795  * guessing that the ACL request can be serviced by a page. If so, we cache
3796  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3797  * the cache. If not so, we throw away the page, and cache the required
3798  * length. The next getxattr call will then produce another round trip to
3799  * the server, this time with the input buf of the required size.
3800  */
3801 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3802 {
3803         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3804         struct nfs_getaclargs args = {
3805                 .fh = NFS_FH(inode),
3806                 .acl_pages = pages,
3807                 .acl_len = buflen,
3808         };
3809         struct nfs_getaclres res = {
3810                 .acl_len = buflen,
3811         };
3812         struct rpc_message msg = {
3813                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3814                 .rpc_argp = &args,
3815                 .rpc_resp = &res,
3816         };
3817         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3818         int ret = -ENOMEM, i;
3819
3820         /* As long as we're doing a round trip to the server anyway,
3821          * let's be prepared for a page of acl data. */
3822         if (npages == 0)
3823                 npages = 1;
3824         if (npages > ARRAY_SIZE(pages))
3825                 return -ERANGE;
3826
3827         for (i = 0; i < npages; i++) {
3828                 pages[i] = alloc_page(GFP_KERNEL);
3829                 if (!pages[i])
3830                         goto out_free;
3831         }
3832
3833         /* for decoding across pages */
3834         res.acl_scratch = alloc_page(GFP_KERNEL);
3835         if (!res.acl_scratch)
3836                 goto out_free;
3837
3838         args.acl_len = npages * PAGE_SIZE;
3839         args.acl_pgbase = 0;
3840
3841         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3842                 __func__, buf, buflen, npages, args.acl_len);
3843         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3844                              &msg, &args.seq_args, &res.seq_res, 0);
3845         if (ret)
3846                 goto out_free;
3847
3848         /* Handle the case where the passed-in buffer is too short */
3849         if (res.acl_flags & NFS4_ACL_TRUNC) {
3850                 /* Did the user only issue a request for the acl length? */
3851                 if (buf == NULL)
3852                         goto out_ok;
3853                 ret = -ERANGE;
3854                 goto out_free;
3855         }
3856         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3857         if (buf) {
3858                 if (res.acl_len > buflen) {
3859                         ret = -ERANGE;
3860                         goto out_free;
3861                 }
3862                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3863         }
3864 out_ok:
3865         ret = res.acl_len;
3866 out_free:
3867         for (i = 0; i < npages; i++)
3868                 if (pages[i])
3869                         __free_page(pages[i]);
3870         if (res.acl_scratch)
3871                 __free_page(res.acl_scratch);
3872         return ret;
3873 }
3874
3875 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3876 {
3877         struct nfs4_exception exception = { };
3878         ssize_t ret;
3879         do {
3880                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3881                 if (ret >= 0)
3882                         break;
3883                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3884         } while (exception.retry);
3885         return ret;
3886 }
3887
3888 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3889 {
3890         struct nfs_server *server = NFS_SERVER(inode);
3891         int ret;
3892
3893         if (!nfs4_server_supports_acls(server))
3894                 return -EOPNOTSUPP;
3895         ret = nfs_revalidate_inode(server, inode);
3896         if (ret < 0)
3897                 return ret;
3898         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3899                 nfs_zap_acl_cache(inode);
3900         ret = nfs4_read_cached_acl(inode, buf, buflen);
3901         if (ret != -ENOENT)
3902                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3903                  * but no cached acl data, just the acl length */
3904                 return ret;
3905         return nfs4_get_acl_uncached(inode, buf, buflen);
3906 }
3907
3908 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3909 {
3910         struct nfs_server *server = NFS_SERVER(inode);
3911         struct page *pages[NFS4ACL_MAXPAGES];
3912         struct nfs_setaclargs arg = {
3913                 .fh             = NFS_FH(inode),
3914                 .acl_pages      = pages,
3915                 .acl_len        = buflen,
3916         };
3917         struct nfs_setaclres res;
3918         struct rpc_message msg = {
3919                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3920                 .rpc_argp       = &arg,
3921                 .rpc_resp       = &res,
3922         };
3923         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3924         int ret, i;
3925
3926         if (!nfs4_server_supports_acls(server))
3927                 return -EOPNOTSUPP;
3928         if (npages > ARRAY_SIZE(pages))
3929                 return -ERANGE;
3930         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3931         if (i < 0)
3932                 return i;
3933         nfs4_inode_return_delegation(inode);
3934         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3935
3936         /*
3937          * Free each page after tx, so the only ref left is
3938          * held by the network stack
3939          */
3940         for (; i > 0; i--)
3941                 put_page(pages[i-1]);
3942
3943         /*
3944          * Acl update can result in inode attribute update.
3945          * so mark the attribute cache invalid.
3946          */
3947         spin_lock(&inode->i_lock);
3948         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3949         spin_unlock(&inode->i_lock);
3950         nfs_access_zap_cache(inode);
3951         nfs_zap_acl_cache(inode);
3952         return ret;
3953 }
3954
3955 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3956 {
3957         struct nfs4_exception exception = { };
3958         int err;
3959         do {
3960                 err = nfs4_handle_exception(NFS_SERVER(inode),
3961                                 __nfs4_proc_set_acl(inode, buf, buflen),
3962                                 &exception);
3963         } while (exception.retry);
3964         return err;
3965 }
3966
3967 static int
3968 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3969 {
3970         struct nfs_client *clp = server->nfs_client;
3971
3972         if (task->tk_status >= 0)
3973                 return 0;
3974         switch(task->tk_status) {
3975                 case -NFS4ERR_DELEG_REVOKED:
3976                 case -NFS4ERR_ADMIN_REVOKED:
3977                 case -NFS4ERR_BAD_STATEID:
3978                         if (state == NULL)
3979                                 break;
3980                         nfs_remove_bad_delegation(state->inode);
3981                 case -NFS4ERR_OPENMODE:
3982                         if (state == NULL)
3983                                 break;
3984                         nfs4_schedule_stateid_recovery(server, state);
3985                         goto wait_on_recovery;
3986                 case -NFS4ERR_EXPIRED:
3987                         if (state != NULL)
3988                                 nfs4_schedule_stateid_recovery(server, state);
3989                 case -NFS4ERR_STALE_STATEID:
3990                 case -NFS4ERR_STALE_CLIENTID:
3991                         nfs4_schedule_lease_recovery(clp);
3992                         goto wait_on_recovery;
3993 #if defined(CONFIG_NFS_V4_1)
3994                 case -NFS4ERR_BADSESSION:
3995                 case -NFS4ERR_BADSLOT:
3996                 case -NFS4ERR_BAD_HIGH_SLOT:
3997                 case -NFS4ERR_DEADSESSION:
3998                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3999                 case -NFS4ERR_SEQ_FALSE_RETRY:
4000                 case -NFS4ERR_SEQ_MISORDERED:
4001                         dprintk("%s ERROR %d, Reset session\n", __func__,
4002                                 task->tk_status);
4003                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4004                         task->tk_status = 0;
4005                         return -EAGAIN;
4006 #endif /* CONFIG_NFS_V4_1 */
4007                 case -NFS4ERR_DELAY:
4008                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4009                 case -NFS4ERR_GRACE:
4010                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4011                         task->tk_status = 0;
4012                         return -EAGAIN;
4013                 case -NFS4ERR_RETRY_UNCACHED_REP:
4014                 case -NFS4ERR_OLD_STATEID:
4015                         task->tk_status = 0;
4016                         return -EAGAIN;
4017         }
4018         task->tk_status = nfs4_map_errors(task->tk_status);
4019         return 0;
4020 wait_on_recovery:
4021         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4022         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4023                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4024         task->tk_status = 0;
4025         return -EAGAIN;
4026 }
4027
4028 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4029                                     nfs4_verifier *bootverf)
4030 {
4031         __be32 verf[2];
4032
4033         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4034                 /* An impossible timestamp guarantees this value
4035                  * will never match a generated boot time. */
4036                 verf[0] = 0;
4037                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4038         } else {
4039                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4040                 verf[0] = (__be32)nn->boot_time.tv_sec;
4041                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4042         }
4043         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4044 }
4045
4046 static unsigned int
4047 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4048                                    char *buf, size_t len)
4049 {
4050         unsigned int result;
4051
4052         rcu_read_lock();
4053         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4054                                 clp->cl_ipaddr,
4055                                 rpc_peeraddr2str(clp->cl_rpcclient,
4056                                                         RPC_DISPLAY_ADDR),
4057                                 rpc_peeraddr2str(clp->cl_rpcclient,
4058                                                         RPC_DISPLAY_PROTO));
4059         rcu_read_unlock();
4060         return result;
4061 }
4062
4063 static unsigned int
4064 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4065                                 char *buf, size_t len)
4066 {
4067         char *nodename = clp->cl_rpcclient->cl_nodename;
4068
4069         if (nfs4_client_id_uniquifier[0] != '\0')
4070                 nodename = nfs4_client_id_uniquifier;
4071         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4072                                 clp->rpc_ops->version, clp->cl_minorversion,
4073                                 nodename);
4074 }
4075
4076 /**
4077  * nfs4_proc_setclientid - Negotiate client ID
4078  * @clp: state data structure
4079  * @program: RPC program for NFSv4 callback service
4080  * @port: IP port number for NFS4 callback service
4081  * @cred: RPC credential to use for this call
4082  * @res: where to place the result
4083  *
4084  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4085  */
4086 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4087                 unsigned short port, struct rpc_cred *cred,
4088                 struct nfs4_setclientid_res *res)
4089 {
4090         nfs4_verifier sc_verifier;
4091         struct nfs4_setclientid setclientid = {
4092                 .sc_verifier = &sc_verifier,
4093                 .sc_prog = program,
4094                 .sc_cb_ident = clp->cl_cb_ident,
4095         };
4096         struct rpc_message msg = {
4097                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4098                 .rpc_argp = &setclientid,
4099                 .rpc_resp = res,
4100                 .rpc_cred = cred,
4101         };
4102         int status;
4103
4104         /* nfs_client_id4 */
4105         nfs4_init_boot_verifier(clp, &sc_verifier);
4106         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4107                 setclientid.sc_name_len =
4108                                 nfs4_init_uniform_client_string(clp,
4109                                                 setclientid.sc_name,
4110                                                 sizeof(setclientid.sc_name));
4111         else
4112                 setclientid.sc_name_len =
4113                                 nfs4_init_nonuniform_client_string(clp,
4114                                                 setclientid.sc_name,
4115                                                 sizeof(setclientid.sc_name));
4116         /* cb_client4 */
4117         rcu_read_lock();
4118         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4119                                 sizeof(setclientid.sc_netid),
4120                                 rpc_peeraddr2str(clp->cl_rpcclient,
4121                                                         RPC_DISPLAY_NETID));
4122         rcu_read_unlock();
4123         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4124                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4125                                 clp->cl_ipaddr, port >> 8, port & 255);
4126
4127         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4128                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4129                 setclientid.sc_name_len, setclientid.sc_name);
4130         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4131         dprintk("NFS reply setclientid: %d\n", status);
4132         return status;
4133 }
4134
4135 /**
4136  * nfs4_proc_setclientid_confirm - Confirm client ID
4137  * @clp: state data structure
4138  * @res: result of a previous SETCLIENTID
4139  * @cred: RPC credential to use for this call
4140  *
4141  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4142  */
4143 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4144                 struct nfs4_setclientid_res *arg,
4145                 struct rpc_cred *cred)
4146 {
4147         struct nfs_fsinfo fsinfo;
4148         struct rpc_message msg = {
4149                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4150                 .rpc_argp = arg,
4151                 .rpc_resp = &fsinfo,
4152                 .rpc_cred = cred,
4153         };
4154         unsigned long now;
4155         int status;
4156
4157         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4158                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4159                 clp->cl_clientid);
4160         now = jiffies;
4161         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4162         if (status == 0) {
4163                 spin_lock(&clp->cl_lock);
4164                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4165                 clp->cl_last_renewal = now;
4166                 spin_unlock(&clp->cl_lock);
4167         }
4168         dprintk("NFS reply setclientid_confirm: %d\n", status);
4169         return status;
4170 }
4171
4172 struct nfs4_delegreturndata {
4173         struct nfs4_delegreturnargs args;
4174         struct nfs4_delegreturnres res;
4175         struct nfs_fh fh;
4176         nfs4_stateid stateid;
4177         unsigned long timestamp;
4178         struct nfs_fattr fattr;
4179         int rpc_status;
4180 };
4181
4182 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4183 {
4184         struct nfs4_delegreturndata *data = calldata;
4185
4186         if (!nfs4_sequence_done(task, &data->res.seq_res))
4187                 return;
4188
4189         switch (task->tk_status) {
4190         case -NFS4ERR_STALE_STATEID:
4191         case -NFS4ERR_EXPIRED:
4192         case 0:
4193                 renew_lease(data->res.server, data->timestamp);
4194                 break;
4195         default:
4196                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4197                                 -EAGAIN) {
4198                         rpc_restart_call_prepare(task);
4199                         return;
4200                 }
4201         }
4202         data->rpc_status = task->tk_status;
4203 }
4204
4205 static void nfs4_delegreturn_release(void *calldata)
4206 {
4207         kfree(calldata);
4208 }
4209
4210 #if defined(CONFIG_NFS_V4_1)
4211 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4212 {
4213         struct nfs4_delegreturndata *d_data;
4214
4215         d_data = (struct nfs4_delegreturndata *)data;
4216
4217         nfs4_setup_sequence(d_data->res.server,
4218                         &d_data->args.seq_args,
4219                         &d_data->res.seq_res,
4220                         task);
4221 }
4222 #endif /* CONFIG_NFS_V4_1 */
4223
4224 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4225 #if defined(CONFIG_NFS_V4_1)
4226         .rpc_call_prepare = nfs4_delegreturn_prepare,
4227 #endif /* CONFIG_NFS_V4_1 */
4228         .rpc_call_done = nfs4_delegreturn_done,
4229         .rpc_release = nfs4_delegreturn_release,
4230 };
4231
4232 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4233 {
4234         struct nfs4_delegreturndata *data;
4235         struct nfs_server *server = NFS_SERVER(inode);
4236         struct rpc_task *task;
4237         struct rpc_message msg = {
4238                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4239                 .rpc_cred = cred,
4240         };
4241         struct rpc_task_setup task_setup_data = {
4242                 .rpc_client = server->client,
4243                 .rpc_message = &msg,
4244                 .callback_ops = &nfs4_delegreturn_ops,
4245                 .flags = RPC_TASK_ASYNC,
4246         };
4247         int status = 0;
4248
4249         data = kzalloc(sizeof(*data), GFP_NOFS);
4250         if (data == NULL)
4251                 return -ENOMEM;
4252         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4253         data->args.fhandle = &data->fh;
4254         data->args.stateid = &data->stateid;
4255         data->args.bitmask = server->cache_consistency_bitmask;
4256         nfs_copy_fh(&data->fh, NFS_FH(inode));
4257         nfs4_stateid_copy(&data->stateid, stateid);
4258         data->res.fattr = &data->fattr;
4259         data->res.server = server;
4260         nfs_fattr_init(data->res.fattr);
4261         data->timestamp = jiffies;
4262         data->rpc_status = 0;
4263
4264         task_setup_data.callback_data = data;
4265         msg.rpc_argp = &data->args;
4266         msg.rpc_resp = &data->res;
4267         task = rpc_run_task(&task_setup_data);
4268         if (IS_ERR(task))
4269                 return PTR_ERR(task);
4270         if (!issync)
4271                 goto out;
4272         status = nfs4_wait_for_completion_rpc_task(task);
4273         if (status != 0)
4274                 goto out;
4275         status = data->rpc_status;
4276         if (status == 0)
4277                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4278         else
4279                 nfs_refresh_inode(inode, &data->fattr);
4280 out:
4281         rpc_put_task(task);
4282         return status;
4283 }
4284
4285 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4286 {
4287         struct nfs_server *server = NFS_SERVER(inode);
4288         struct nfs4_exception exception = { };
4289         int err;
4290         do {
4291                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4292                 switch (err) {
4293                         case -NFS4ERR_STALE_STATEID:
4294                         case -NFS4ERR_EXPIRED:
4295                         case 0:
4296                                 return 0;
4297                 }
4298                 err = nfs4_handle_exception(server, err, &exception);
4299         } while (exception.retry);
4300         return err;
4301 }
4302
4303 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4304 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4305
4306 /*
4307  * sleep, with exponential backoff, and retry the LOCK operation.
4308  */
4309 static unsigned long
4310 nfs4_set_lock_task_retry(unsigned long timeout)
4311 {
4312         freezable_schedule_timeout_killable(timeout);
4313         timeout <<= 1;
4314         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4315                 return NFS4_LOCK_MAXTIMEOUT;
4316         return timeout;
4317 }
4318
4319 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4320 {
4321         struct inode *inode = state->inode;
4322         struct nfs_server *server = NFS_SERVER(inode);
4323         struct nfs_client *clp = server->nfs_client;
4324         struct nfs_lockt_args arg = {
4325                 .fh = NFS_FH(inode),
4326                 .fl = request,
4327         };
4328         struct nfs_lockt_res res = {
4329                 .denied = request,
4330         };
4331         struct rpc_message msg = {
4332                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4333                 .rpc_argp       = &arg,
4334                 .rpc_resp       = &res,
4335                 .rpc_cred       = state->owner->so_cred,
4336         };
4337         struct nfs4_lock_state *lsp;
4338         int status;
4339
4340         arg.lock_owner.clientid = clp->cl_clientid;
4341         status = nfs4_set_lock_state(state, request);
4342         if (status != 0)
4343                 goto out;
4344         lsp = request->fl_u.nfs4_fl.owner;
4345         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4346         arg.lock_owner.s_dev = server->s_dev;
4347         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4348         switch (status) {
4349                 case 0:
4350                         request->fl_type = F_UNLCK;
4351                         break;
4352                 case -NFS4ERR_DENIED:
4353                         status = 0;
4354         }
4355         request->fl_ops->fl_release_private(request);
4356 out:
4357         return status;
4358 }
4359
4360 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4361 {
4362         struct nfs4_exception exception = { };
4363         int err;
4364
4365         do {
4366                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4367                                 _nfs4_proc_getlk(state, cmd, request),
4368                                 &exception);
4369         } while (exception.retry);
4370         return err;
4371 }
4372
4373 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4374 {
4375         int res = 0;
4376         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4377                 case FL_POSIX:
4378                         res = posix_lock_file_wait(file, fl);
4379                         break;
4380                 case FL_FLOCK:
4381                         res = flock_lock_file_wait(file, fl);
4382                         break;
4383                 default:
4384                         BUG();
4385         }
4386         return res;
4387 }
4388
4389 struct nfs4_unlockdata {
4390         struct nfs_locku_args arg;
4391         struct nfs_locku_res res;
4392         struct nfs4_lock_state *lsp;
4393         struct nfs_open_context *ctx;
4394         struct file_lock fl;
4395         const struct nfs_server *server;
4396         unsigned long timestamp;
4397 };
4398
4399 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4400                 struct nfs_open_context *ctx,
4401                 struct nfs4_lock_state *lsp,
4402                 struct nfs_seqid *seqid)
4403 {
4404         struct nfs4_unlockdata *p;
4405         struct inode *inode = lsp->ls_state->inode;
4406
4407         p = kzalloc(sizeof(*p), GFP_NOFS);
4408         if (p == NULL)
4409                 return NULL;
4410         p->arg.fh = NFS_FH(inode);
4411         p->arg.fl = &p->fl;
4412         p->arg.seqid = seqid;
4413         p->res.seqid = seqid;
4414         p->arg.stateid = &lsp->ls_stateid;
4415         p->lsp = lsp;
4416         atomic_inc(&lsp->ls_count);
4417         /* Ensure we don't close file until we're done freeing locks! */
4418         p->ctx = get_nfs_open_context(ctx);
4419         memcpy(&p->fl, fl, sizeof(p->fl));
4420         p->server = NFS_SERVER(inode);
4421         return p;
4422 }
4423
4424 static void nfs4_locku_release_calldata(void *data)
4425 {
4426         struct nfs4_unlockdata *calldata = data;
4427         nfs_free_seqid(calldata->arg.seqid);
4428         nfs4_put_lock_state(calldata->lsp);
4429         put_nfs_open_context(calldata->ctx);
4430         kfree(calldata);
4431 }
4432
4433 static void nfs4_locku_done(struct rpc_task *task, void *data)
4434 {
4435         struct nfs4_unlockdata *calldata = data;
4436
4437         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4438                 return;
4439         switch (task->tk_status) {
4440                 case 0:
4441                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4442                                         &calldata->res.stateid);
4443                         renew_lease(calldata->server, calldata->timestamp);
4444                         break;
4445                 case -NFS4ERR_BAD_STATEID:
4446                 case -NFS4ERR_OLD_STATEID:
4447                 case -NFS4ERR_STALE_STATEID:
4448                 case -NFS4ERR_EXPIRED:
4449                         break;
4450                 default:
4451                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4452                                 rpc_restart_call_prepare(task);
4453         }
4454         nfs_release_seqid(calldata->arg.seqid);
4455 }
4456
4457 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4458 {
4459         struct nfs4_unlockdata *calldata = data;
4460
4461         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4462                 goto out_wait;
4463         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4464                 /* Note: exit _without_ running nfs4_locku_done */
4465                 goto out_no_action;
4466         }
4467         calldata->timestamp = jiffies;
4468         if (nfs4_setup_sequence(calldata->server,
4469                                 &calldata->arg.seq_args,
4470                                 &calldata->res.seq_res,
4471                                 task) != 0)
4472                 nfs_release_seqid(calldata->arg.seqid);
4473         return;
4474 out_no_action:
4475         task->tk_action = NULL;
4476 out_wait:
4477         nfs4_sequence_done(task, &calldata->res.seq_res);
4478 }
4479
4480 static const struct rpc_call_ops nfs4_locku_ops = {
4481         .rpc_call_prepare = nfs4_locku_prepare,
4482         .rpc_call_done = nfs4_locku_done,
4483         .rpc_release = nfs4_locku_release_calldata,
4484 };
4485
4486 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4487                 struct nfs_open_context *ctx,
4488                 struct nfs4_lock_state *lsp,
4489                 struct nfs_seqid *seqid)
4490 {
4491         struct nfs4_unlockdata *data;
4492         struct rpc_message msg = {
4493                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4494                 .rpc_cred = ctx->cred,
4495         };
4496         struct rpc_task_setup task_setup_data = {
4497                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4498                 .rpc_message = &msg,
4499                 .callback_ops = &nfs4_locku_ops,
4500                 .workqueue = nfsiod_workqueue,
4501                 .flags = RPC_TASK_ASYNC,
4502         };
4503
4504         /* Ensure this is an unlock - when canceling a lock, the
4505          * canceled lock is passed in, and it won't be an unlock.
4506          */
4507         fl->fl_type = F_UNLCK;
4508
4509         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4510         if (data == NULL) {
4511                 nfs_free_seqid(seqid);
4512                 return ERR_PTR(-ENOMEM);
4513         }
4514
4515         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4516         msg.rpc_argp = &data->arg;
4517         msg.rpc_resp = &data->res;
4518         task_setup_data.callback_data = data;
4519         return rpc_run_task(&task_setup_data);
4520 }
4521
4522 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4523 {
4524         struct inode *inode = state->inode;
4525         struct nfs4_state_owner *sp = state->owner;
4526         struct nfs_inode *nfsi = NFS_I(inode);
4527         struct nfs_seqid *seqid;
4528         struct nfs4_lock_state *lsp;
4529         struct rpc_task *task;
4530         int status = 0;
4531         unsigned char fl_flags = request->fl_flags;
4532
4533         status = nfs4_set_lock_state(state, request);
4534         /* Unlock _before_ we do the RPC call */
4535         request->fl_flags |= FL_EXISTS;
4536         /* Exclude nfs_delegation_claim_locks() */
4537         mutex_lock(&sp->so_delegreturn_mutex);
4538         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
4539         down_read(&nfsi->rwsem);
4540         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4541                 up_read(&nfsi->rwsem);
4542                 mutex_unlock(&sp->so_delegreturn_mutex);
4543                 goto out;
4544         }
4545         up_read(&nfsi->rwsem);
4546         mutex_unlock(&sp->so_delegreturn_mutex);
4547         if (status != 0)
4548                 goto out;
4549         /* Is this a delegated lock? */
4550         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4551                 goto out;
4552         lsp = request->fl_u.nfs4_fl.owner;
4553         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4554         status = -ENOMEM;
4555         if (seqid == NULL)
4556                 goto out;
4557         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4558         status = PTR_ERR(task);
4559         if (IS_ERR(task))
4560                 goto out;
4561         status = nfs4_wait_for_completion_rpc_task(task);
4562         rpc_put_task(task);
4563 out:
4564         request->fl_flags = fl_flags;
4565         return status;
4566 }
4567
4568 struct nfs4_lockdata {
4569         struct nfs_lock_args arg;
4570         struct nfs_lock_res res;
4571         struct nfs4_lock_state *lsp;
4572         struct nfs_open_context *ctx;
4573         struct file_lock fl;
4574         unsigned long timestamp;
4575         int rpc_status;
4576         int cancelled;
4577         struct nfs_server *server;
4578 };
4579
4580 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4581                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4582                 gfp_t gfp_mask)
4583 {
4584         struct nfs4_lockdata *p;
4585         struct inode *inode = lsp->ls_state->inode;
4586         struct nfs_server *server = NFS_SERVER(inode);
4587
4588         p = kzalloc(sizeof(*p), gfp_mask);
4589         if (p == NULL)
4590                 return NULL;
4591
4592         p->arg.fh = NFS_FH(inode);
4593         p->arg.fl = &p->fl;
4594         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4595         if (p->arg.open_seqid == NULL)
4596                 goto out_free;
4597         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4598         if (p->arg.lock_seqid == NULL)
4599                 goto out_free_seqid;
4600         p->arg.lock_stateid = &lsp->ls_stateid;
4601         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4602         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4603         p->arg.lock_owner.s_dev = server->s_dev;
4604         p->res.lock_seqid = p->arg.lock_seqid;
4605         p->lsp = lsp;
4606         p->server = server;
4607         atomic_inc(&lsp->ls_count);
4608         p->ctx = get_nfs_open_context(ctx);
4609         memcpy(&p->fl, fl, sizeof(p->fl));
4610         return p;
4611 out_free_seqid:
4612         nfs_free_seqid(p->arg.open_seqid);
4613 out_free:
4614         kfree(p);
4615         return NULL;
4616 }
4617
4618 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4619 {
4620         struct nfs4_lockdata *data = calldata;
4621         struct nfs4_state *state = data->lsp->ls_state;
4622
4623         dprintk("%s: begin!\n", __func__);
4624         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4625                 goto out_wait;
4626         /* Do we need to do an open_to_lock_owner? */
4627         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4628                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
4629                         goto out_release_lock_seqid;
4630                 }
4631                 data->arg.open_stateid = &state->stateid;
4632                 data->arg.new_lock_owner = 1;
4633                 data->res.open_seqid = data->arg.open_seqid;
4634         } else
4635                 data->arg.new_lock_owner = 0;
4636         data->timestamp = jiffies;
4637         if (nfs4_setup_sequence(data->server,
4638                                 &data->arg.seq_args,
4639                                 &data->res.seq_res,
4640                                 task) == 0)
4641                 return;
4642         nfs_release_seqid(data->arg.open_seqid);
4643 out_release_lock_seqid:
4644         nfs_release_seqid(data->arg.lock_seqid);
4645 out_wait:
4646         nfs4_sequence_done(task, &data->res.seq_res);
4647         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4648 }
4649
4650 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4651 {
4652         struct nfs4_lockdata *data = calldata;
4653
4654         dprintk("%s: begin!\n", __func__);
4655
4656         if (!nfs4_sequence_done(task, &data->res.seq_res))
4657                 return;
4658
4659         data->rpc_status = task->tk_status;
4660         if (data->arg.new_lock_owner != 0) {
4661                 if (data->rpc_status == 0)
4662                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4663                 else
4664                         goto out;
4665         }
4666         if (data->rpc_status == 0) {
4667                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4668                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4669                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4670         }
4671 out:
4672         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4673 }
4674
4675 static void nfs4_lock_release(void *calldata)
4676 {
4677         struct nfs4_lockdata *data = calldata;
4678
4679         dprintk("%s: begin!\n", __func__);
4680         nfs_free_seqid(data->arg.open_seqid);
4681         if (data->cancelled != 0) {
4682                 struct rpc_task *task;
4683                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4684                                 data->arg.lock_seqid);
4685                 if (!IS_ERR(task))
4686                         rpc_put_task_async(task);
4687                 dprintk("%s: cancelling lock!\n", __func__);
4688         } else
4689                 nfs_free_seqid(data->arg.lock_seqid);
4690         nfs4_put_lock_state(data->lsp);
4691         put_nfs_open_context(data->ctx);
4692         kfree(data);
4693         dprintk("%s: done!\n", __func__);
4694 }
4695
4696 static const struct rpc_call_ops nfs4_lock_ops = {
4697         .rpc_call_prepare = nfs4_lock_prepare,
4698         .rpc_call_done = nfs4_lock_done,
4699         .rpc_release = nfs4_lock_release,
4700 };
4701
4702 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4703 {
4704         switch (error) {
4705         case -NFS4ERR_ADMIN_REVOKED:
4706         case -NFS4ERR_BAD_STATEID:
4707                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4708                 if (new_lock_owner != 0 ||
4709                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4710                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4711                 break;
4712         case -NFS4ERR_STALE_STATEID:
4713                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4714         case -NFS4ERR_EXPIRED:
4715                 nfs4_schedule_lease_recovery(server->nfs_client);
4716         };
4717 }
4718
4719 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4720 {
4721         struct nfs4_lockdata *data;
4722         struct rpc_task *task;
4723         struct rpc_message msg = {
4724                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4725                 .rpc_cred = state->owner->so_cred,
4726         };
4727         struct rpc_task_setup task_setup_data = {
4728                 .rpc_client = NFS_CLIENT(state->inode),
4729                 .rpc_message = &msg,
4730                 .callback_ops = &nfs4_lock_ops,
4731                 .workqueue = nfsiod_workqueue,
4732                 .flags = RPC_TASK_ASYNC,
4733         };
4734         int ret;
4735
4736         dprintk("%s: begin!\n", __func__);
4737         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4738                         fl->fl_u.nfs4_fl.owner,
4739                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4740         if (data == NULL)
4741                 return -ENOMEM;
4742         if (IS_SETLKW(cmd))
4743                 data->arg.block = 1;
4744         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4745         msg.rpc_argp = &data->arg;
4746         msg.rpc_resp = &data->res;
4747         task_setup_data.callback_data = data;
4748         if (recovery_type > NFS_LOCK_NEW) {
4749                 if (recovery_type == NFS_LOCK_RECLAIM)
4750                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4751                 nfs4_set_sequence_privileged(&data->arg.seq_args);
4752         }
4753         task = rpc_run_task(&task_setup_data);
4754         if (IS_ERR(task))
4755                 return PTR_ERR(task);
4756         ret = nfs4_wait_for_completion_rpc_task(task);
4757         if (ret == 0) {
4758                 ret = data->rpc_status;
4759                 if (ret)
4760                         nfs4_handle_setlk_error(data->server, data->lsp,
4761                                         data->arg.new_lock_owner, ret);
4762         } else
4763                 data->cancelled = 1;
4764         rpc_put_task(task);
4765         dprintk("%s: done, ret = %d!\n", __func__, ret);
4766         return ret;
4767 }
4768
4769 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4770 {
4771         struct nfs_server *server = NFS_SERVER(state->inode);
4772         struct nfs4_exception exception = {
4773                 .inode = state->inode,
4774         };
4775         int err;
4776
4777         do {
4778                 /* Cache the lock if possible... */
4779                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4780                         return 0;
4781                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4782                 if (err != -NFS4ERR_DELAY)
4783                         break;
4784                 nfs4_handle_exception(server, err, &exception);
4785         } while (exception.retry);
4786         return err;
4787 }
4788
4789 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4790 {
4791         struct nfs_server *server = NFS_SERVER(state->inode);
4792         struct nfs4_exception exception = {
4793                 .inode = state->inode,
4794         };
4795         int err;
4796
4797         err = nfs4_set_lock_state(state, request);
4798         if (err != 0)
4799                 return err;
4800         do {
4801                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4802                         return 0;
4803                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4804                 switch (err) {
4805                 default:
4806                         goto out;
4807                 case -NFS4ERR_GRACE:
4808                 case -NFS4ERR_DELAY:
4809                         nfs4_handle_exception(server, err, &exception);
4810                         err = 0;
4811                 }
4812         } while (exception.retry);
4813 out:
4814         return err;
4815 }
4816
4817 #if defined(CONFIG_NFS_V4_1)
4818 /**
4819  * nfs41_check_expired_locks - possibly free a lock stateid
4820  *
4821  * @state: NFSv4 state for an inode
4822  *
4823  * Returns NFS_OK if recovery for this stateid is now finished.
4824  * Otherwise a negative NFS4ERR value is returned.
4825  */
4826 static int nfs41_check_expired_locks(struct nfs4_state *state)
4827 {
4828         int status, ret = -NFS4ERR_BAD_STATEID;
4829         struct nfs4_lock_state *lsp;
4830         struct nfs_server *server = NFS_SERVER(state->inode);
4831
4832         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4833                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4834                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4835                         if (status != NFS_OK) {
4836                                 /* Free the stateid unless the server
4837                                  * informs us the stateid is unrecognized. */
4838                                 if (status != -NFS4ERR_BAD_STATEID)
4839                                         nfs41_free_stateid(server,
4840                                                         &lsp->ls_stateid);
4841                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4842                                 ret = status;
4843                         }
4844                 }
4845         };
4846
4847         return ret;
4848 }
4849
4850 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4851 {
4852         int status = NFS_OK;
4853
4854         if (test_bit(LK_STATE_IN_USE, &state->flags))
4855                 status = nfs41_check_expired_locks(state);
4856         if (status != NFS_OK)
4857                 status = nfs4_lock_expired(state, request);
4858         return status;
4859 }
4860 #endif
4861
4862 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4863 {
4864         struct nfs4_state_owner *sp = state->owner;
4865         struct nfs_inode *nfsi = NFS_I(state->inode);
4866         unsigned char fl_flags = request->fl_flags;
4867         unsigned int seq;
4868         int status = -ENOLCK;
4869
4870         if ((fl_flags & FL_POSIX) &&
4871                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4872                 goto out;
4873         /* Is this a delegated open? */
4874         status = nfs4_set_lock_state(state, request);
4875         if (status != 0)
4876                 goto out;
4877         request->fl_flags |= FL_ACCESS;
4878         status = do_vfs_lock(request->fl_file, request);
4879         if (status < 0)
4880                 goto out;
4881         down_read(&nfsi->rwsem);
4882         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4883                 /* Yes: cache locks! */
4884                 /* ...but avoid races with delegation recall... */
4885                 request->fl_flags = fl_flags & ~FL_SLEEP;
4886                 status = do_vfs_lock(request->fl_file, request);
4887                 goto out_unlock;
4888         }
4889         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
4890         up_read(&nfsi->rwsem);
4891         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4892         if (status != 0)
4893                 goto out;
4894         down_read(&nfsi->rwsem);
4895         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
4896                 status = -NFS4ERR_DELAY;
4897                 goto out_unlock;
4898         }
4899         /* Note: we always want to sleep here! */
4900         request->fl_flags = fl_flags | FL_SLEEP;
4901         if (do_vfs_lock(request->fl_file, request) < 0)
4902                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4903                         "manager!\n", __func__);
4904 out_unlock:
4905         up_read(&nfsi->rwsem);
4906 out:
4907         request->fl_flags = fl_flags;
4908         return status;
4909 }
4910
4911 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4912 {
4913         struct nfs4_exception exception = {
4914                 .state = state,
4915                 .inode = state->inode,
4916         };
4917         int err;
4918
4919         do {
4920                 err = _nfs4_proc_setlk(state, cmd, request);
4921                 if (err == -NFS4ERR_DENIED)
4922                         err = -EAGAIN;
4923                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4924                                 err, &exception);
4925         } while (exception.retry);
4926         return err;
4927 }
4928
4929 static int
4930 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4931 {
4932         struct nfs_open_context *ctx;
4933         struct nfs4_state *state;
4934         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4935         int status;
4936
4937         /* verify open state */
4938         ctx = nfs_file_open_context(filp);
4939         state = ctx->state;
4940
4941         if (request->fl_start < 0 || request->fl_end < 0)
4942                 return -EINVAL;
4943
4944         if (IS_GETLK(cmd)) {
4945                 if (state != NULL)
4946                         return nfs4_proc_getlk(state, F_GETLK, request);
4947                 return 0;
4948         }
4949
4950         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4951                 return -EINVAL;
4952
4953         if (request->fl_type == F_UNLCK) {
4954                 if (state != NULL)
4955                         return nfs4_proc_unlck(state, cmd, request);
4956                 return 0;
4957         }
4958
4959         if (state == NULL)
4960                 return -ENOLCK;
4961         /*
4962          * Don't rely on the VFS having checked the file open mode,
4963          * since it won't do this for flock() locks.
4964          */
4965         switch (request->fl_type) {
4966         case F_RDLCK:
4967                 if (!(filp->f_mode & FMODE_READ))
4968                         return -EBADF;
4969                 break;
4970         case F_WRLCK:
4971                 if (!(filp->f_mode & FMODE_WRITE))
4972                         return -EBADF;
4973         }
4974
4975         do {
4976                 status = nfs4_proc_setlk(state, cmd, request);
4977                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4978                         break;
4979                 timeout = nfs4_set_lock_task_retry(timeout);
4980                 status = -ERESTARTSYS;
4981                 if (signalled())
4982                         break;
4983         } while(status < 0);
4984         return status;
4985 }
4986
4987 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4988 {
4989         struct nfs_server *server = NFS_SERVER(state->inode);
4990         struct nfs4_exception exception = { };
4991         int err;
4992
4993         err = nfs4_set_lock_state(state, fl);
4994         if (err != 0)
4995                 goto out;
4996         do {
4997                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4998                 switch (err) {
4999                         default:
5000                                 printk(KERN_ERR "NFS: %s: unhandled error "
5001                                         "%d.\n", __func__, err);
5002                         case 0:
5003                         case -ESTALE:
5004                                 goto out;
5005                         case -NFS4ERR_STALE_CLIENTID:
5006                         case -NFS4ERR_STALE_STATEID:
5007                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5008                         case -NFS4ERR_EXPIRED:
5009                                 nfs4_schedule_lease_recovery(server->nfs_client);
5010                                 err = -EAGAIN;
5011                                 goto out;
5012                         case -NFS4ERR_BADSESSION:
5013                         case -NFS4ERR_BADSLOT:
5014                         case -NFS4ERR_BAD_HIGH_SLOT:
5015                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5016                         case -NFS4ERR_DEADSESSION:
5017                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5018                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5019                                 err = -EAGAIN;
5020                                 goto out;
5021                         case -NFS4ERR_DELEG_REVOKED:
5022                         case -NFS4ERR_ADMIN_REVOKED:
5023                         case -NFS4ERR_BAD_STATEID:
5024                         case -NFS4ERR_OPENMODE:
5025                                 nfs4_schedule_stateid_recovery(server, state);
5026                                 err = 0;
5027                                 goto out;
5028                         case -NFS4ERR_DELAY:
5029                         case -NFS4ERR_GRACE:
5030                                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5031                                 ssleep(1);
5032                                 err = -EAGAIN;
5033                                 goto out;
5034                         case -ENOMEM:
5035                         case -NFS4ERR_DENIED:
5036                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5037                                 err = 0;
5038                                 goto out;
5039                 }
5040                 set_bit(NFS_DELEGATED_STATE, &state->flags);
5041                 err = nfs4_handle_exception(server, err, &exception);
5042         } while (exception.retry);
5043 out:
5044         return err;
5045 }
5046
5047 struct nfs_release_lockowner_data {
5048         struct nfs4_lock_state *lsp;
5049         struct nfs_server *server;
5050         struct nfs_release_lockowner_args args;
5051 };
5052
5053 static void nfs4_release_lockowner_release(void *calldata)
5054 {
5055         struct nfs_release_lockowner_data *data = calldata;
5056         nfs4_free_lock_state(data->server, data->lsp);
5057         kfree(calldata);
5058 }
5059
5060 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5061         .rpc_release = nfs4_release_lockowner_release,
5062 };
5063
5064 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5065 {
5066         struct nfs_server *server = lsp->ls_state->owner->so_server;
5067         struct nfs_release_lockowner_data *data;
5068         struct rpc_message msg = {
5069                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5070         };
5071
5072         if (server->nfs_client->cl_mvops->minor_version != 0)
5073                 return -EINVAL;
5074         data = kmalloc(sizeof(*data), GFP_NOFS);
5075         if (!data)
5076                 return -ENOMEM;
5077         data->lsp = lsp;
5078         data->server = server;
5079         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5080         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5081         data->args.lock_owner.s_dev = server->s_dev;
5082         msg.rpc_argp = &data->args;
5083         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5084         return 0;
5085 }
5086
5087 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5088
5089 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5090                                    const void *buf, size_t buflen,
5091                                    int flags, int type)
5092 {
5093         if (strcmp(key, "") != 0)
5094                 return -EINVAL;
5095
5096         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5097 }
5098
5099 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5100                                    void *buf, size_t buflen, int type)
5101 {
5102         if (strcmp(key, "") != 0)
5103                 return -EINVAL;
5104
5105         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5106 }
5107
5108 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5109                                        size_t list_len, const char *name,
5110                                        size_t name_len, int type)
5111 {
5112         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5113
5114         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5115                 return 0;
5116
5117         if (list && len <= list_len)
5118                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5119         return len;
5120 }
5121
5122 /*
5123  * nfs_fhget will use either the mounted_on_fileid or the fileid
5124  */
5125 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5126 {
5127         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5128                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5129               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5130               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5131                 return;
5132
5133         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5134                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5135         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5136         fattr->nlink = 2;
5137 }
5138
5139 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5140                                    const struct qstr *name,
5141                                    struct nfs4_fs_locations *fs_locations,
5142                                    struct page *page)
5143 {
5144         struct nfs_server *server = NFS_SERVER(dir);
5145         u32 bitmask[2] = {
5146                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5147         };
5148         struct nfs4_fs_locations_arg args = {
5149                 .dir_fh = NFS_FH(dir),
5150                 .name = name,
5151                 .page = page,
5152                 .bitmask = bitmask,
5153         };
5154         struct nfs4_fs_locations_res res = {
5155                 .fs_locations = fs_locations,
5156         };
5157         struct rpc_message msg = {
5158                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5159                 .rpc_argp = &args,
5160                 .rpc_resp = &res,
5161         };
5162         int status;
5163
5164         dprintk("%s: start\n", __func__);
5165
5166         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5167          * is not supported */
5168         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5169                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5170         else
5171                 bitmask[0] |= FATTR4_WORD0_FILEID;
5172
5173         nfs_fattr_init(&fs_locations->fattr);
5174         fs_locations->server = server;
5175         fs_locations->nlocations = 0;
5176         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5177         dprintk("%s: returned status = %d\n", __func__, status);
5178         return status;
5179 }
5180
5181 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5182                            const struct qstr *name,
5183                            struct nfs4_fs_locations *fs_locations,
5184                            struct page *page)
5185 {
5186         struct nfs4_exception exception = { };
5187         int err;
5188         do {
5189                 err = nfs4_handle_exception(NFS_SERVER(dir),
5190                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5191                                 &exception);
5192         } while (exception.retry);
5193         return err;
5194 }
5195
5196 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5197 {
5198         int status;
5199         struct nfs4_secinfo_arg args = {
5200                 .dir_fh = NFS_FH(dir),
5201                 .name   = name,
5202         };
5203         struct nfs4_secinfo_res res = {
5204                 .flavors     = flavors,
5205         };
5206         struct rpc_message msg = {
5207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5208                 .rpc_argp = &args,
5209                 .rpc_resp = &res,
5210         };
5211
5212         dprintk("NFS call  secinfo %s\n", name->name);
5213         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5214         dprintk("NFS reply  secinfo: %d\n", status);
5215         return status;
5216 }
5217
5218 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5219                       struct nfs4_secinfo_flavors *flavors)
5220 {
5221         struct nfs4_exception exception = { };
5222         int err;
5223         do {
5224                 err = nfs4_handle_exception(NFS_SERVER(dir),
5225                                 _nfs4_proc_secinfo(dir, name, flavors),
5226                                 &exception);
5227         } while (exception.retry);
5228         return err;
5229 }
5230
5231 #ifdef CONFIG_NFS_V4_1
5232 /*
5233  * Check the exchange flags returned by the server for invalid flags, having
5234  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5235  * DS flags set.
5236  */
5237 static int nfs4_check_cl_exchange_flags(u32 flags)
5238 {
5239         if (flags & ~EXCHGID4_FLAG_MASK_R)
5240                 goto out_inval;
5241         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5242             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5243                 goto out_inval;
5244         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5245                 goto out_inval;
5246         return NFS_OK;
5247 out_inval:
5248         return -NFS4ERR_INVAL;
5249 }
5250
5251 static bool
5252 nfs41_same_server_scope(struct nfs41_server_scope *a,
5253                         struct nfs41_server_scope *b)
5254 {
5255         if (a->server_scope_sz == b->server_scope_sz &&
5256             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5257                 return true;
5258
5259         return false;
5260 }
5261
5262 /*
5263  * nfs4_proc_bind_conn_to_session()
5264  *
5265  * The 4.1 client currently uses the same TCP connection for the
5266  * fore and backchannel.
5267  */
5268 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5269 {
5270         int status;
5271         struct nfs41_bind_conn_to_session_res res;
5272         struct rpc_message msg = {
5273                 .rpc_proc =
5274                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5275                 .rpc_argp = clp,
5276                 .rpc_resp = &res,
5277                 .rpc_cred = cred,
5278         };
5279
5280         dprintk("--> %s\n", __func__);
5281
5282         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5283         if (unlikely(res.session == NULL)) {
5284                 status = -ENOMEM;
5285                 goto out;
5286         }
5287
5288         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5289         if (status == 0) {
5290                 if (memcmp(res.session->sess_id.data,
5291                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5292                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5293                         status = -EIO;
5294                         goto out_session;
5295                 }
5296                 if (res.dir != NFS4_CDFS4_BOTH) {
5297                         dprintk("NFS: %s: Unexpected direction from server\n",
5298                                 __func__);
5299                         status = -EIO;
5300                         goto out_session;
5301                 }
5302                 if (res.use_conn_in_rdma_mode) {
5303                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5304                                 __func__);
5305                         status = -EIO;
5306                         goto out_session;
5307                 }
5308         }
5309 out_session:
5310         kfree(res.session);
5311 out:
5312         dprintk("<-- %s status= %d\n", __func__, status);
5313         return status;
5314 }
5315
5316 /*
5317  * nfs4_proc_exchange_id()
5318  *
5319  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5320  *
5321  * Since the clientid has expired, all compounds using sessions
5322  * associated with the stale clientid will be returning
5323  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5324  * be in some phase of session reset.
5325  */
5326 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5327 {
5328         nfs4_verifier verifier;
5329         struct nfs41_exchange_id_args args = {
5330                 .verifier = &verifier,
5331                 .client = clp,
5332                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5333         };
5334         struct nfs41_exchange_id_res res = {
5335                 0
5336         };
5337         int status;
5338         struct rpc_message msg = {
5339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5340                 .rpc_argp = &args,
5341                 .rpc_resp = &res,
5342                 .rpc_cred = cred,
5343         };
5344
5345         nfs4_init_boot_verifier(clp, &verifier);
5346         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5347                                                         sizeof(args.id));
5348         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5349                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5350                 args.id_len, args.id);
5351
5352         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5353                                         GFP_NOFS);
5354         if (unlikely(res.server_owner == NULL)) {
5355                 status = -ENOMEM;
5356                 goto out;
5357         }
5358
5359         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5360                                         GFP_NOFS);
5361         if (unlikely(res.server_scope == NULL)) {
5362                 status = -ENOMEM;
5363                 goto out_server_owner;
5364         }
5365
5366         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5367         if (unlikely(res.impl_id == NULL)) {
5368                 status = -ENOMEM;
5369                 goto out_server_scope;
5370         }
5371
5372         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5373         if (status == 0)
5374                 status = nfs4_check_cl_exchange_flags(res.flags);
5375
5376         if (status == 0) {
5377                 clp->cl_clientid = res.clientid;
5378                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5379                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5380                         clp->cl_seqid = res.seqid;
5381
5382                 kfree(clp->cl_serverowner);
5383                 clp->cl_serverowner = res.server_owner;
5384                 res.server_owner = NULL;
5385
5386                 /* use the most recent implementation id */
5387                 kfree(clp->cl_implid);
5388                 clp->cl_implid = res.impl_id;
5389
5390                 if (clp->cl_serverscope != NULL &&
5391                     !nfs41_same_server_scope(clp->cl_serverscope,
5392                                              res.server_scope)) {
5393                         dprintk("%s: server_scope mismatch detected\n",
5394                                 __func__);
5395                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5396                         kfree(clp->cl_serverscope);
5397                         clp->cl_serverscope = NULL;
5398                 }
5399
5400                 if (clp->cl_serverscope == NULL) {
5401                         clp->cl_serverscope = res.server_scope;
5402                         goto out;
5403                 }
5404         } else
5405                 kfree(res.impl_id);
5406
5407 out_server_owner:
5408         kfree(res.server_owner);
5409 out_server_scope:
5410         kfree(res.server_scope);
5411 out:
5412         if (clp->cl_implid != NULL)
5413                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5414                         "domain: %s, name: %s, date: %llu,%u\n",
5415                         clp->cl_implid->domain, clp->cl_implid->name,
5416                         clp->cl_implid->date.seconds,
5417                         clp->cl_implid->date.nseconds);
5418         dprintk("NFS reply exchange_id: %d\n", status);
5419         return status;
5420 }
5421
5422 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5423                 struct rpc_cred *cred)
5424 {
5425         struct rpc_message msg = {
5426                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5427                 .rpc_argp = clp,
5428                 .rpc_cred = cred,
5429         };
5430         int status;
5431
5432         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5433         if (status)
5434                 dprintk("NFS: Got error %d from the server %s on "
5435                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5436         return status;
5437 }
5438
5439 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5440                 struct rpc_cred *cred)
5441 {
5442         unsigned int loop;
5443         int ret;
5444
5445         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5446                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5447                 switch (ret) {
5448                 case -NFS4ERR_DELAY:
5449                 case -NFS4ERR_CLIENTID_BUSY:
5450                         ssleep(1);
5451                         break;
5452                 default:
5453                         return ret;
5454                 }
5455         }
5456         return 0;
5457 }
5458
5459 int nfs4_destroy_clientid(struct nfs_client *clp)
5460 {
5461         struct rpc_cred *cred;
5462         int ret = 0;
5463
5464         if (clp->cl_mvops->minor_version < 1)
5465                 goto out;
5466         if (clp->cl_exchange_flags == 0)
5467                 goto out;
5468         if (clp->cl_preserve_clid)
5469                 goto out;
5470         cred = nfs4_get_exchange_id_cred(clp);
5471         ret = nfs4_proc_destroy_clientid(clp, cred);
5472         if (cred)
5473                 put_rpccred(cred);
5474         switch (ret) {
5475         case 0:
5476         case -NFS4ERR_STALE_CLIENTID:
5477                 clp->cl_exchange_flags = 0;
5478         }
5479 out:
5480         return ret;
5481 }
5482
5483 struct nfs4_get_lease_time_data {
5484         struct nfs4_get_lease_time_args *args;
5485         struct nfs4_get_lease_time_res *res;
5486         struct nfs_client *clp;
5487 };
5488
5489 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5490                                         void *calldata)
5491 {
5492         struct nfs4_get_lease_time_data *data =
5493                         (struct nfs4_get_lease_time_data *)calldata;
5494
5495         dprintk("--> %s\n", __func__);
5496         /* just setup sequence, do not trigger session recovery
5497            since we're invoked within one */
5498         nfs41_setup_sequence(data->clp->cl_session,
5499                         &data->args->la_seq_args,
5500                         &data->res->lr_seq_res,
5501                         task);
5502         dprintk("<-- %s\n", __func__);
5503 }
5504
5505 /*
5506  * Called from nfs4_state_manager thread for session setup, so don't recover
5507  * from sequence operation or clientid errors.
5508  */
5509 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5510 {
5511         struct nfs4_get_lease_time_data *data =
5512                         (struct nfs4_get_lease_time_data *)calldata;
5513
5514         dprintk("--> %s\n", __func__);
5515         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5516                 return;
5517         switch (task->tk_status) {
5518         case -NFS4ERR_DELAY:
5519         case -NFS4ERR_GRACE:
5520                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5521                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5522                 task->tk_status = 0;
5523                 /* fall through */
5524         case -NFS4ERR_RETRY_UNCACHED_REP:
5525                 rpc_restart_call_prepare(task);
5526                 return;
5527         }
5528         dprintk("<-- %s\n", __func__);
5529 }
5530
5531 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5532         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5533         .rpc_call_done = nfs4_get_lease_time_done,
5534 };
5535
5536 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5537 {
5538         struct rpc_task *task;
5539         struct nfs4_get_lease_time_args args;
5540         struct nfs4_get_lease_time_res res = {
5541                 .lr_fsinfo = fsinfo,
5542         };
5543         struct nfs4_get_lease_time_data data = {
5544                 .args = &args,
5545                 .res = &res,
5546                 .clp = clp,
5547         };
5548         struct rpc_message msg = {
5549                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5550                 .rpc_argp = &args,
5551                 .rpc_resp = &res,
5552         };
5553         struct rpc_task_setup task_setup = {
5554                 .rpc_client = clp->cl_rpcclient,
5555                 .rpc_message = &msg,
5556                 .callback_ops = &nfs4_get_lease_time_ops,
5557                 .callback_data = &data,
5558                 .flags = RPC_TASK_TIMEOUT,
5559         };
5560         int status;
5561
5562         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5563         nfs4_set_sequence_privileged(&args.la_seq_args);
5564         dprintk("--> %s\n", __func__);
5565         task = rpc_run_task(&task_setup);
5566
5567         if (IS_ERR(task))
5568                 status = PTR_ERR(task);
5569         else {
5570                 status = task->tk_status;
5571                 rpc_put_task(task);
5572         }
5573         dprintk("<-- %s return %d\n", __func__, status);
5574
5575         return status;
5576 }
5577
5578 /*
5579  * Initialize the values to be used by the client in CREATE_SESSION
5580  * If nfs4_init_session set the fore channel request and response sizes,
5581  * use them.
5582  *
5583  * Set the back channel max_resp_sz_cached to zero to force the client to
5584  * always set csa_cachethis to FALSE because the current implementation
5585  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5586  */
5587 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5588 {
5589         struct nfs4_session *session = args->client->cl_session;
5590         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5591                      mxresp_sz = session->fc_target_max_resp_sz;
5592
5593         if (mxrqst_sz == 0)
5594                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5595         if (mxresp_sz == 0)
5596                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5597         /* Fore channel attributes */
5598         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5599         args->fc_attrs.max_resp_sz = mxresp_sz;
5600         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5601         args->fc_attrs.max_reqs = max_session_slots;
5602
5603         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5604                 "max_ops=%u max_reqs=%u\n",
5605                 __func__,
5606                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5607                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5608
5609         /* Back channel attributes */
5610         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5611         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5612         args->bc_attrs.max_resp_sz_cached = 0;
5613         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5614         args->bc_attrs.max_reqs = 1;
5615
5616         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5617                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5618                 __func__,
5619                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5620                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5621                 args->bc_attrs.max_reqs);
5622 }
5623
5624 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5625 {
5626         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5627         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5628
5629         if (rcvd->max_resp_sz > sent->max_resp_sz)
5630                 return -EINVAL;
5631         /*
5632          * Our requested max_ops is the minimum we need; we're not
5633          * prepared to break up compounds into smaller pieces than that.
5634          * So, no point even trying to continue if the server won't
5635          * cooperate:
5636          */
5637         if (rcvd->max_ops < sent->max_ops)
5638                 return -EINVAL;
5639         if (rcvd->max_reqs == 0)
5640                 return -EINVAL;
5641         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5642                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5643         return 0;
5644 }
5645
5646 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5647 {
5648         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5649         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5650
5651         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5652                 return -EINVAL;
5653         if (rcvd->max_resp_sz < sent->max_resp_sz)
5654                 return -EINVAL;
5655         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5656                 return -EINVAL;
5657         /* These would render the backchannel useless: */
5658         if (rcvd->max_ops != sent->max_ops)
5659                 return -EINVAL;
5660         if (rcvd->max_reqs != sent->max_reqs)
5661                 return -EINVAL;
5662         return 0;
5663 }
5664
5665 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5666                                      struct nfs4_session *session)
5667 {
5668         int ret;
5669
5670         ret = nfs4_verify_fore_channel_attrs(args, session);
5671         if (ret)
5672                 return ret;
5673         return nfs4_verify_back_channel_attrs(args, session);
5674 }
5675
5676 static int _nfs4_proc_create_session(struct nfs_client *clp,
5677                 struct rpc_cred *cred)
5678 {
5679         struct nfs4_session *session = clp->cl_session;
5680         struct nfs41_create_session_args args = {
5681                 .client = clp,
5682                 .cb_program = NFS4_CALLBACK,
5683         };
5684         struct nfs41_create_session_res res = {
5685                 .client = clp,
5686         };
5687         struct rpc_message msg = {
5688                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5689                 .rpc_argp = &args,
5690                 .rpc_resp = &res,
5691                 .rpc_cred = cred,
5692         };
5693         int status;
5694
5695         nfs4_init_channel_attrs(&args);
5696         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5697
5698         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5699
5700         if (!status) {
5701                 /* Verify the session's negotiated channel_attrs values */
5702                 status = nfs4_verify_channel_attrs(&args, session);
5703                 /* Increment the clientid slot sequence id */
5704                 clp->cl_seqid++;
5705         }
5706
5707         return status;
5708 }
5709
5710 /*
5711  * Issues a CREATE_SESSION operation to the server.
5712  * It is the responsibility of the caller to verify the session is
5713  * expired before calling this routine.
5714  */
5715 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5716 {
5717         int status;
5718         unsigned *ptr;
5719         struct nfs4_session *session = clp->cl_session;
5720
5721         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5722
5723         status = _nfs4_proc_create_session(clp, cred);
5724         if (status)
5725                 goto out;
5726
5727         /* Init or reset the session slot tables */
5728         status = nfs4_setup_session_slot_tables(session);
5729         dprintk("slot table setup returned %d\n", status);
5730         if (status)
5731                 goto out;
5732
5733         ptr = (unsigned *)&session->sess_id.data[0];
5734         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5735                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5736 out:
5737         dprintk("<-- %s\n", __func__);
5738         return status;
5739 }
5740
5741 /*
5742  * Issue the over-the-wire RPC DESTROY_SESSION.
5743  * The caller must serialize access to this routine.
5744  */
5745 int nfs4_proc_destroy_session(struct nfs4_session *session,
5746                 struct rpc_cred *cred)
5747 {
5748         struct rpc_message msg = {
5749                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5750                 .rpc_argp = session,
5751                 .rpc_cred = cred,
5752         };
5753         int status = 0;
5754
5755         dprintk("--> nfs4_proc_destroy_session\n");
5756
5757         /* session is still being setup */
5758         if (session->clp->cl_cons_state != NFS_CS_READY)
5759                 return status;
5760
5761         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5762
5763         if (status)
5764                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5765                         "Session has been destroyed regardless...\n", status);
5766
5767         dprintk("<-- nfs4_proc_destroy_session\n");
5768         return status;
5769 }
5770
5771 /*
5772  * Renew the cl_session lease.
5773  */
5774 struct nfs4_sequence_data {
5775         struct nfs_client *clp;
5776         struct nfs4_sequence_args args;
5777         struct nfs4_sequence_res res;
5778 };
5779
5780 static void nfs41_sequence_release(void *data)
5781 {
5782         struct nfs4_sequence_data *calldata = data;
5783         struct nfs_client *clp = calldata->clp;
5784
5785         if (atomic_read(&clp->cl_count) > 1)
5786                 nfs4_schedule_state_renewal(clp);
5787         nfs_put_client(clp);
5788         kfree(calldata);
5789 }
5790
5791 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5792 {
5793         switch(task->tk_status) {
5794         case -NFS4ERR_DELAY:
5795                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5796                 return -EAGAIN;
5797         default:
5798                 nfs4_schedule_lease_recovery(clp);
5799         }
5800         return 0;
5801 }
5802
5803 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5804 {
5805         struct nfs4_sequence_data *calldata = data;
5806         struct nfs_client *clp = calldata->clp;
5807
5808         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5809                 return;
5810
5811         if (task->tk_status < 0) {
5812                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5813                 if (atomic_read(&clp->cl_count) == 1)
5814                         goto out;
5815
5816                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5817                         rpc_restart_call_prepare(task);
5818                         return;
5819                 }
5820         }
5821         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5822 out:
5823         dprintk("<-- %s\n", __func__);
5824 }
5825
5826 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5827 {
5828         struct nfs4_sequence_data *calldata = data;
5829         struct nfs_client *clp = calldata->clp;
5830         struct nfs4_sequence_args *args;
5831         struct nfs4_sequence_res *res;
5832
5833         args = task->tk_msg.rpc_argp;
5834         res = task->tk_msg.rpc_resp;
5835
5836         nfs41_setup_sequence(clp->cl_session, args, res, task);
5837 }
5838
5839 static const struct rpc_call_ops nfs41_sequence_ops = {
5840         .rpc_call_done = nfs41_sequence_call_done,
5841         .rpc_call_prepare = nfs41_sequence_prepare,
5842         .rpc_release = nfs41_sequence_release,
5843 };
5844
5845 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
5846                 struct rpc_cred *cred,
5847                 bool is_privileged)
5848 {
5849         struct nfs4_sequence_data *calldata;
5850         struct rpc_message msg = {
5851                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5852                 .rpc_cred = cred,
5853         };
5854         struct rpc_task_setup task_setup_data = {
5855                 .rpc_client = clp->cl_rpcclient,
5856                 .rpc_message = &msg,
5857                 .callback_ops = &nfs41_sequence_ops,
5858                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5859         };
5860
5861         if (!atomic_inc_not_zero(&clp->cl_count))
5862                 return ERR_PTR(-EIO);
5863         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5864         if (calldata == NULL) {
5865                 nfs_put_client(clp);
5866                 return ERR_PTR(-ENOMEM);
5867         }
5868         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5869         if (is_privileged)
5870                 nfs4_set_sequence_privileged(&calldata->args);
5871         msg.rpc_argp = &calldata->args;
5872         msg.rpc_resp = &calldata->res;
5873         calldata->clp = clp;
5874         task_setup_data.callback_data = calldata;
5875
5876         return rpc_run_task(&task_setup_data);
5877 }
5878
5879 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5880 {
5881         struct rpc_task *task;
5882         int ret = 0;
5883
5884         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5885                 return 0;
5886         task = _nfs41_proc_sequence(clp, cred, false);
5887         if (IS_ERR(task))
5888                 ret = PTR_ERR(task);
5889         else
5890                 rpc_put_task_async(task);
5891         dprintk("<-- %s status=%d\n", __func__, ret);
5892         return ret;
5893 }
5894
5895 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5896 {
5897         struct rpc_task *task;
5898         int ret;
5899
5900         task = _nfs41_proc_sequence(clp, cred, true);
5901         if (IS_ERR(task)) {
5902                 ret = PTR_ERR(task);
5903                 goto out;
5904         }
5905         ret = rpc_wait_for_completion_task(task);
5906         if (!ret) {
5907                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5908
5909                 if (task->tk_status == 0)
5910                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5911                 ret = task->tk_status;
5912         }
5913         rpc_put_task(task);
5914 out:
5915         dprintk("<-- %s status=%d\n", __func__, ret);
5916         return ret;
5917 }
5918
5919 struct nfs4_reclaim_complete_data {
5920         struct nfs_client *clp;
5921         struct nfs41_reclaim_complete_args arg;
5922         struct nfs41_reclaim_complete_res res;
5923 };
5924
5925 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5926 {
5927         struct nfs4_reclaim_complete_data *calldata = data;
5928
5929         nfs41_setup_sequence(calldata->clp->cl_session,
5930                         &calldata->arg.seq_args,
5931                         &calldata->res.seq_res,
5932                         task);
5933 }
5934
5935 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5936 {
5937         switch(task->tk_status) {
5938         case 0:
5939         case -NFS4ERR_COMPLETE_ALREADY:
5940         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5941                 break;
5942         case -NFS4ERR_DELAY:
5943                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5944                 /* fall through */
5945         case -NFS4ERR_RETRY_UNCACHED_REP:
5946                 return -EAGAIN;
5947         default:
5948                 nfs4_schedule_lease_recovery(clp);
5949         }
5950         return 0;
5951 }
5952
5953 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5954 {
5955         struct nfs4_reclaim_complete_data *calldata = data;
5956         struct nfs_client *clp = calldata->clp;
5957         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5958
5959         dprintk("--> %s\n", __func__);
5960         if (!nfs41_sequence_done(task, res))
5961                 return;
5962
5963         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5964                 rpc_restart_call_prepare(task);
5965                 return;
5966         }
5967         dprintk("<-- %s\n", __func__);
5968 }
5969
5970 static void nfs4_free_reclaim_complete_data(void *data)
5971 {
5972         struct nfs4_reclaim_complete_data *calldata = data;
5973
5974         kfree(calldata);
5975 }
5976
5977 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5978         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5979         .rpc_call_done = nfs4_reclaim_complete_done,
5980         .rpc_release = nfs4_free_reclaim_complete_data,
5981 };
5982
5983 /*
5984  * Issue a global reclaim complete.
5985  */
5986 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5987 {
5988         struct nfs4_reclaim_complete_data *calldata;
5989         struct rpc_task *task;
5990         struct rpc_message msg = {
5991                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5992         };
5993         struct rpc_task_setup task_setup_data = {
5994                 .rpc_client = clp->cl_rpcclient,
5995                 .rpc_message = &msg,
5996                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5997                 .flags = RPC_TASK_ASYNC,
5998         };
5999         int status = -ENOMEM;
6000
6001         dprintk("--> %s\n", __func__);
6002         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6003         if (calldata == NULL)
6004                 goto out;
6005         calldata->clp = clp;
6006         calldata->arg.one_fs = 0;
6007
6008         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6009         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6010         msg.rpc_argp = &calldata->arg;
6011         msg.rpc_resp = &calldata->res;
6012         task_setup_data.callback_data = calldata;
6013         task = rpc_run_task(&task_setup_data);
6014         if (IS_ERR(task)) {
6015                 status = PTR_ERR(task);
6016                 goto out;
6017         }
6018         status = nfs4_wait_for_completion_rpc_task(task);
6019         if (status == 0)
6020                 status = task->tk_status;
6021         rpc_put_task(task);
6022         return 0;
6023 out:
6024         dprintk("<-- %s status=%d\n", __func__, status);
6025         return status;
6026 }
6027
6028 static void
6029 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6030 {
6031         struct nfs4_layoutget *lgp = calldata;
6032         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6033         struct nfs4_session *session = nfs4_get_session(server);
6034
6035         dprintk("--> %s\n", __func__);
6036         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6037          * right now covering the LAYOUTGET we are about to send.
6038          * However, that is not so catastrophic, and there seems
6039          * to be no way to prevent it completely.
6040          */
6041         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6042                                 &lgp->res.seq_res, task))
6043                 return;
6044         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6045                                           NFS_I(lgp->args.inode)->layout,
6046                                           lgp->args.ctx->state)) {
6047                 rpc_exit(task, NFS4_OK);
6048         }
6049 }
6050
6051 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6052 {
6053         struct nfs4_layoutget *lgp = calldata;
6054         struct inode *inode = lgp->args.inode;
6055         struct nfs_server *server = NFS_SERVER(inode);
6056         struct pnfs_layout_hdr *lo;
6057         struct nfs4_state *state = NULL;
6058         unsigned long timeo, giveup;
6059
6060         dprintk("--> %s\n", __func__);
6061
6062         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6063                 goto out;
6064
6065         switch (task->tk_status) {
6066         case 0:
6067                 goto out;
6068         case -NFS4ERR_LAYOUTTRYLATER:
6069         case -NFS4ERR_RECALLCONFLICT:
6070                 timeo = rpc_get_timeout(task->tk_client);
6071                 giveup = lgp->args.timestamp + timeo;
6072                 if (time_after(giveup, jiffies))
6073                         task->tk_status = -NFS4ERR_DELAY;
6074                 break;
6075         case -NFS4ERR_EXPIRED:
6076         case -NFS4ERR_BAD_STATEID:
6077                 spin_lock(&inode->i_lock);
6078                 lo = NFS_I(inode)->layout;
6079                 if (!lo || list_empty(&lo->plh_segs)) {
6080                         spin_unlock(&inode->i_lock);
6081                         /* If the open stateid was bad, then recover it. */
6082                         state = lgp->args.ctx->state;
6083                 } else {
6084                         LIST_HEAD(head);
6085
6086                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6087                         spin_unlock(&inode->i_lock);
6088                         /* Mark the bad layout state as invalid, then
6089                          * retry using the open stateid. */
6090                         pnfs_free_lseg_list(&head);
6091                 }
6092         }
6093         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6094                 rpc_restart_call_prepare(task);
6095 out:
6096         dprintk("<-- %s\n", __func__);
6097 }
6098
6099 static size_t max_response_pages(struct nfs_server *server)
6100 {
6101         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6102         return nfs_page_array_len(0, max_resp_sz);
6103 }
6104
6105 static void nfs4_free_pages(struct page **pages, size_t size)
6106 {
6107         int i;
6108
6109         if (!pages)
6110                 return;
6111
6112         for (i = 0; i < size; i++) {
6113                 if (!pages[i])
6114                         break;
6115                 __free_page(pages[i]);
6116         }
6117         kfree(pages);
6118 }
6119
6120 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6121 {
6122         struct page **pages;
6123         int i;
6124
6125         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6126         if (!pages) {
6127                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6128                 return NULL;
6129         }
6130
6131         for (i = 0; i < size; i++) {
6132                 pages[i] = alloc_page(gfp_flags);
6133                 if (!pages[i]) {
6134                         dprintk("%s: failed to allocate page\n", __func__);
6135                         nfs4_free_pages(pages, size);
6136                         return NULL;
6137                 }
6138         }
6139
6140         return pages;
6141 }
6142
6143 static void nfs4_layoutget_release(void *calldata)
6144 {
6145         struct nfs4_layoutget *lgp = calldata;
6146         struct inode *inode = lgp->args.inode;
6147         struct nfs_server *server = NFS_SERVER(inode);
6148         size_t max_pages = max_response_pages(server);
6149
6150         dprintk("--> %s\n", __func__);
6151         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6152         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6153         put_nfs_open_context(lgp->args.ctx);
6154         kfree(calldata);
6155         dprintk("<-- %s\n", __func__);
6156 }
6157
6158 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6159         .rpc_call_prepare = nfs4_layoutget_prepare,
6160         .rpc_call_done = nfs4_layoutget_done,
6161         .rpc_release = nfs4_layoutget_release,
6162 };
6163
6164 struct pnfs_layout_segment *
6165 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6166 {
6167         struct inode *inode = lgp->args.inode;
6168         struct nfs_server *server = NFS_SERVER(inode);
6169         size_t max_pages = max_response_pages(server);
6170         struct rpc_task *task;
6171         struct rpc_message msg = {
6172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6173                 .rpc_argp = &lgp->args,
6174                 .rpc_resp = &lgp->res,
6175         };
6176         struct rpc_task_setup task_setup_data = {
6177                 .rpc_client = server->client,
6178                 .rpc_message = &msg,
6179                 .callback_ops = &nfs4_layoutget_call_ops,
6180                 .callback_data = lgp,
6181                 .flags = RPC_TASK_ASYNC,
6182         };
6183         struct pnfs_layout_segment *lseg = NULL;
6184         int status = 0;
6185
6186         dprintk("--> %s\n", __func__);
6187
6188         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6189         if (!lgp->args.layout.pages) {
6190                 nfs4_layoutget_release(lgp);
6191                 return ERR_PTR(-ENOMEM);
6192         }
6193         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6194         lgp->args.timestamp = jiffies;
6195
6196         lgp->res.layoutp = &lgp->args.layout;
6197         lgp->res.seq_res.sr_slot = NULL;
6198         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6199
6200         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6201         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6202
6203         task = rpc_run_task(&task_setup_data);
6204         if (IS_ERR(task))
6205                 return ERR_CAST(task);
6206         status = nfs4_wait_for_completion_rpc_task(task);
6207         if (status == 0)
6208                 status = task->tk_status;
6209         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6210         if (status == 0 && lgp->res.layoutp->len)
6211                 lseg = pnfs_layout_process(lgp);
6212         rpc_put_task(task);
6213         dprintk("<-- %s status=%d\n", __func__, status);
6214         if (status)
6215                 return ERR_PTR(status);
6216         return lseg;
6217 }
6218
6219 static void
6220 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6221 {
6222         struct nfs4_layoutreturn *lrp = calldata;
6223
6224         dprintk("--> %s\n", __func__);
6225         nfs41_setup_sequence(lrp->clp->cl_session,
6226                         &lrp->args.seq_args,
6227                         &lrp->res.seq_res,
6228                         task);
6229 }
6230
6231 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6232 {
6233         struct nfs4_layoutreturn *lrp = calldata;
6234         struct nfs_server *server;
6235
6236         dprintk("--> %s\n", __func__);
6237
6238         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6239                 return;
6240
6241         server = NFS_SERVER(lrp->args.inode);
6242         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6243                 rpc_restart_call_prepare(task);
6244                 return;
6245         }
6246         dprintk("<-- %s\n", __func__);
6247 }
6248
6249 static void nfs4_layoutreturn_release(void *calldata)
6250 {
6251         struct nfs4_layoutreturn *lrp = calldata;
6252         struct pnfs_layout_hdr *lo = lrp->args.layout;
6253
6254         dprintk("--> %s\n", __func__);
6255         spin_lock(&lo->plh_inode->i_lock);
6256         if (lrp->res.lrs_present)
6257                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6258         lo->plh_block_lgets--;
6259         spin_unlock(&lo->plh_inode->i_lock);
6260         pnfs_put_layout_hdr(lrp->args.layout);
6261         kfree(calldata);
6262         dprintk("<-- %s\n", __func__);
6263 }
6264
6265 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6266         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6267         .rpc_call_done = nfs4_layoutreturn_done,
6268         .rpc_release = nfs4_layoutreturn_release,
6269 };
6270
6271 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6272 {
6273         struct rpc_task *task;
6274         struct rpc_message msg = {
6275                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6276                 .rpc_argp = &lrp->args,
6277                 .rpc_resp = &lrp->res,
6278         };
6279         struct rpc_task_setup task_setup_data = {
6280                 .rpc_client = lrp->clp->cl_rpcclient,
6281                 .rpc_message = &msg,
6282                 .callback_ops = &nfs4_layoutreturn_call_ops,
6283                 .callback_data = lrp,
6284         };
6285         int status;
6286
6287         dprintk("--> %s\n", __func__);
6288         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6289         task = rpc_run_task(&task_setup_data);
6290         if (IS_ERR(task))
6291                 return PTR_ERR(task);
6292         status = task->tk_status;
6293         dprintk("<-- %s status=%d\n", __func__, status);
6294         rpc_put_task(task);
6295         return status;
6296 }
6297
6298 /*
6299  * Retrieve the list of Data Server devices from the MDS.
6300  */
6301 static int _nfs4_getdevicelist(struct nfs_server *server,
6302                                     const struct nfs_fh *fh,
6303                                     struct pnfs_devicelist *devlist)
6304 {
6305         struct nfs4_getdevicelist_args args = {
6306                 .fh = fh,
6307                 .layoutclass = server->pnfs_curr_ld->id,
6308         };
6309         struct nfs4_getdevicelist_res res = {
6310                 .devlist = devlist,
6311         };
6312         struct rpc_message msg = {
6313                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6314                 .rpc_argp = &args,
6315                 .rpc_resp = &res,
6316         };
6317         int status;
6318
6319         dprintk("--> %s\n", __func__);
6320         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6321                                 &res.seq_res, 0);
6322         dprintk("<-- %s status=%d\n", __func__, status);
6323         return status;
6324 }
6325
6326 int nfs4_proc_getdevicelist(struct nfs_server *server,
6327                             const struct nfs_fh *fh,
6328                             struct pnfs_devicelist *devlist)
6329 {
6330         struct nfs4_exception exception = { };
6331         int err;
6332
6333         do {
6334                 err = nfs4_handle_exception(server,
6335                                 _nfs4_getdevicelist(server, fh, devlist),
6336                                 &exception);
6337         } while (exception.retry);
6338
6339         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6340                 err, devlist->num_devs);
6341
6342         return err;
6343 }
6344 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6345
6346 static int
6347 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6348 {
6349         struct nfs4_getdeviceinfo_args args = {
6350                 .pdev = pdev,
6351         };
6352         struct nfs4_getdeviceinfo_res res = {
6353                 .pdev = pdev,
6354         };
6355         struct rpc_message msg = {
6356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6357                 .rpc_argp = &args,
6358                 .rpc_resp = &res,
6359         };
6360         int status;
6361
6362         dprintk("--> %s\n", __func__);
6363         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6364         dprintk("<-- %s status=%d\n", __func__, status);
6365
6366         return status;
6367 }
6368
6369 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6370 {
6371         struct nfs4_exception exception = { };
6372         int err;
6373
6374         do {
6375                 err = nfs4_handle_exception(server,
6376                                         _nfs4_proc_getdeviceinfo(server, pdev),
6377                                         &exception);
6378         } while (exception.retry);
6379         return err;
6380 }
6381 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6382
6383 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6384 {
6385         struct nfs4_layoutcommit_data *data = calldata;
6386         struct nfs_server *server = NFS_SERVER(data->args.inode);
6387         struct nfs4_session *session = nfs4_get_session(server);
6388
6389         nfs41_setup_sequence(session,
6390                         &data->args.seq_args,
6391                         &data->res.seq_res,
6392                         task);
6393 }
6394
6395 static void
6396 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6397 {
6398         struct nfs4_layoutcommit_data *data = calldata;
6399         struct nfs_server *server = NFS_SERVER(data->args.inode);
6400
6401         if (!nfs41_sequence_done(task, &data->res.seq_res))
6402                 return;
6403
6404         switch (task->tk_status) { /* Just ignore these failures */
6405         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6406         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6407         case -NFS4ERR_BADLAYOUT:     /* no layout */
6408         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6409                 task->tk_status = 0;
6410                 break;
6411         case 0:
6412                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6413                                                    data->res.fattr);
6414                 break;
6415         default:
6416                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6417                         rpc_restart_call_prepare(task);
6418                         return;
6419                 }
6420         }
6421 }
6422
6423 static void nfs4_layoutcommit_release(void *calldata)
6424 {
6425         struct nfs4_layoutcommit_data *data = calldata;
6426
6427         pnfs_cleanup_layoutcommit(data);
6428         put_rpccred(data->cred);
6429         kfree(data);
6430 }
6431
6432 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6433         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6434         .rpc_call_done = nfs4_layoutcommit_done,
6435         .rpc_release = nfs4_layoutcommit_release,
6436 };
6437
6438 int
6439 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6440 {
6441         struct rpc_message msg = {
6442                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6443                 .rpc_argp = &data->args,
6444                 .rpc_resp = &data->res,
6445                 .rpc_cred = data->cred,
6446         };
6447         struct rpc_task_setup task_setup_data = {
6448                 .task = &data->task,
6449                 .rpc_client = NFS_CLIENT(data->args.inode),
6450                 .rpc_message = &msg,
6451                 .callback_ops = &nfs4_layoutcommit_ops,
6452                 .callback_data = data,
6453                 .flags = RPC_TASK_ASYNC,
6454         };
6455         struct rpc_task *task;
6456         int status = 0;
6457
6458         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6459                 "lbw: %llu inode %lu\n",
6460                 data->task.tk_pid, sync,
6461                 data->args.lastbytewritten,
6462                 data->args.inode->i_ino);
6463
6464         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6465         task = rpc_run_task(&task_setup_data);
6466         if (IS_ERR(task))
6467                 return PTR_ERR(task);
6468         if (sync == false)
6469                 goto out;
6470         status = nfs4_wait_for_completion_rpc_task(task);
6471         if (status != 0)
6472                 goto out;
6473         status = task->tk_status;
6474 out:
6475         dprintk("%s: status %d\n", __func__, status);
6476         rpc_put_task(task);
6477         return status;
6478 }
6479
6480 static int
6481 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6482                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6483 {
6484         struct nfs41_secinfo_no_name_args args = {
6485                 .style = SECINFO_STYLE_CURRENT_FH,
6486         };
6487         struct nfs4_secinfo_res res = {
6488                 .flavors = flavors,
6489         };
6490         struct rpc_message msg = {
6491                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6492                 .rpc_argp = &args,
6493                 .rpc_resp = &res,
6494         };
6495         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6496 }
6497
6498 static int
6499 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6500                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6501 {
6502         struct nfs4_exception exception = { };
6503         int err;
6504         do {
6505                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6506                 switch (err) {
6507                 case 0:
6508                 case -NFS4ERR_WRONGSEC:
6509                 case -NFS4ERR_NOTSUPP:
6510                         goto out;
6511                 default:
6512                         err = nfs4_handle_exception(server, err, &exception);
6513                 }
6514         } while (exception.retry);
6515 out:
6516         return err;
6517 }
6518
6519 static int
6520 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6521                     struct nfs_fsinfo *info)
6522 {
6523         int err;
6524         struct page *page;
6525         rpc_authflavor_t flavor;
6526         struct nfs4_secinfo_flavors *flavors;
6527
6528         page = alloc_page(GFP_KERNEL);
6529         if (!page) {
6530                 err = -ENOMEM;
6531                 goto out;
6532         }
6533
6534         flavors = page_address(page);
6535         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6536
6537         /*
6538          * Fall back on "guess and check" method if
6539          * the server doesn't support SECINFO_NO_NAME
6540          */
6541         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6542                 err = nfs4_find_root_sec(server, fhandle, info);
6543                 goto out_freepage;
6544         }
6545         if (err)
6546                 goto out_freepage;
6547
6548         flavor = nfs_find_best_sec(flavors);
6549         if (err == 0)
6550                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6551
6552 out_freepage:
6553         put_page(page);
6554         if (err == -EACCES)
6555                 return -EPERM;
6556 out:
6557         return err;
6558 }
6559
6560 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6561 {
6562         int status;
6563         struct nfs41_test_stateid_args args = {
6564                 .stateid = stateid,
6565         };
6566         struct nfs41_test_stateid_res res;
6567         struct rpc_message msg = {
6568                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6569                 .rpc_argp = &args,
6570                 .rpc_resp = &res,
6571         };
6572
6573         dprintk("NFS call  test_stateid %p\n", stateid);
6574         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6575         nfs4_set_sequence_privileged(&args.seq_args);
6576         status = nfs4_call_sync_sequence(server->client, server, &msg,
6577                         &args.seq_args, &res.seq_res);
6578         if (status != NFS_OK) {
6579                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6580                 return status;
6581         }
6582         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6583         return -res.status;
6584 }
6585
6586 /**
6587  * nfs41_test_stateid - perform a TEST_STATEID operation
6588  *
6589  * @server: server / transport on which to perform the operation
6590  * @stateid: state ID to test
6591  *
6592  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6593  * Otherwise a negative NFS4ERR value is returned if the operation
6594  * failed or the state ID is not currently valid.
6595  */
6596 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6597 {
6598         struct nfs4_exception exception = { };
6599         int err;
6600         do {
6601                 err = _nfs41_test_stateid(server, stateid);
6602                 if (err != -NFS4ERR_DELAY)
6603                         break;
6604                 nfs4_handle_exception(server, err, &exception);
6605         } while (exception.retry);
6606         return err;
6607 }
6608
6609 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6610 {
6611         struct nfs41_free_stateid_args args = {
6612                 .stateid = stateid,
6613         };
6614         struct nfs41_free_stateid_res res;
6615         struct rpc_message msg = {
6616                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6617                 .rpc_argp = &args,
6618                 .rpc_resp = &res,
6619         };
6620         int status;
6621
6622         dprintk("NFS call  free_stateid %p\n", stateid);
6623         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6624         nfs4_set_sequence_privileged(&args.seq_args);
6625         status = nfs4_call_sync_sequence(server->client, server, &msg,
6626                         &args.seq_args, &res.seq_res);
6627         dprintk("NFS reply free_stateid: %d\n", status);
6628         return status;
6629 }
6630
6631 /**
6632  * nfs41_free_stateid - perform a FREE_STATEID operation
6633  *
6634  * @server: server / transport on which to perform the operation
6635  * @stateid: state ID to release
6636  *
6637  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6638  * negative NFS4ERR value is returned.
6639  */
6640 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6641 {
6642         struct nfs4_exception exception = { };
6643         int err;
6644         do {
6645                 err = _nfs4_free_stateid(server, stateid);
6646                 if (err != -NFS4ERR_DELAY)
6647                         break;
6648                 nfs4_handle_exception(server, err, &exception);
6649         } while (exception.retry);
6650         return err;
6651 }
6652
6653 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6654                 const nfs4_stateid *s2)
6655 {
6656         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6657                 return false;
6658
6659         if (s1->seqid == s2->seqid)
6660                 return true;
6661         if (s1->seqid == 0 || s2->seqid == 0)
6662                 return true;
6663
6664         return false;
6665 }
6666
6667 #endif /* CONFIG_NFS_V4_1 */
6668
6669 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6670                 const nfs4_stateid *s2)
6671 {
6672         return nfs4_stateid_match(s1, s2);
6673 }
6674
6675
6676 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6677         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6678         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6679         .recover_open   = nfs4_open_reclaim,
6680         .recover_lock   = nfs4_lock_reclaim,
6681         .establish_clid = nfs4_init_clientid,
6682         .get_clid_cred  = nfs4_get_setclientid_cred,
6683         .detect_trunking = nfs40_discover_server_trunking,
6684 };
6685
6686 #if defined(CONFIG_NFS_V4_1)
6687 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6688         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6689         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6690         .recover_open   = nfs4_open_reclaim,
6691         .recover_lock   = nfs4_lock_reclaim,
6692         .establish_clid = nfs41_init_clientid,
6693         .get_clid_cred  = nfs4_get_exchange_id_cred,
6694         .reclaim_complete = nfs41_proc_reclaim_complete,
6695         .detect_trunking = nfs41_discover_server_trunking,
6696 };
6697 #endif /* CONFIG_NFS_V4_1 */
6698
6699 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6700         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6701         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6702         .recover_open   = nfs4_open_expired,
6703         .recover_lock   = nfs4_lock_expired,
6704         .establish_clid = nfs4_init_clientid,
6705         .get_clid_cred  = nfs4_get_setclientid_cred,
6706 };
6707
6708 #if defined(CONFIG_NFS_V4_1)
6709 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6710         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6711         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6712         .recover_open   = nfs41_open_expired,
6713         .recover_lock   = nfs41_lock_expired,
6714         .establish_clid = nfs41_init_clientid,
6715         .get_clid_cred  = nfs4_get_exchange_id_cred,
6716 };
6717 #endif /* CONFIG_NFS_V4_1 */
6718
6719 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6720         .sched_state_renewal = nfs4_proc_async_renew,
6721         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6722         .renew_lease = nfs4_proc_renew,
6723 };
6724
6725 #if defined(CONFIG_NFS_V4_1)
6726 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6727         .sched_state_renewal = nfs41_proc_async_sequence,
6728         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6729         .renew_lease = nfs4_proc_sequence,
6730 };
6731 #endif
6732
6733 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6734         .minor_version = 0,
6735         .call_sync = _nfs4_call_sync,
6736         .match_stateid = nfs4_match_stateid,
6737         .find_root_sec = nfs4_find_root_sec,
6738         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6739         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6740         .state_renewal_ops = &nfs40_state_renewal_ops,
6741 };
6742
6743 #if defined(CONFIG_NFS_V4_1)
6744 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6745         .minor_version = 1,
6746         .call_sync = nfs4_call_sync_sequence,
6747         .match_stateid = nfs41_match_stateid,
6748         .find_root_sec = nfs41_find_root_sec,
6749         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6750         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6751         .state_renewal_ops = &nfs41_state_renewal_ops,
6752 };
6753 #endif
6754
6755 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6756         [0] = &nfs_v4_0_minor_ops,
6757 #if defined(CONFIG_NFS_V4_1)
6758         [1] = &nfs_v4_1_minor_ops,
6759 #endif
6760 };
6761
6762 const struct inode_operations nfs4_dir_inode_operations = {
6763         .create         = nfs_create,
6764         .lookup         = nfs_lookup,
6765         .atomic_open    = nfs_atomic_open,
6766         .link           = nfs_link,
6767         .unlink         = nfs_unlink,
6768         .symlink        = nfs_symlink,
6769         .mkdir          = nfs_mkdir,
6770         .rmdir          = nfs_rmdir,
6771         .mknod          = nfs_mknod,
6772         .rename         = nfs_rename,
6773         .permission     = nfs_permission,
6774         .getattr        = nfs_getattr,
6775         .setattr        = nfs_setattr,
6776         .getxattr       = generic_getxattr,
6777         .setxattr       = generic_setxattr,
6778         .listxattr      = generic_listxattr,
6779         .removexattr    = generic_removexattr,
6780 };
6781
6782 static const struct inode_operations nfs4_file_inode_operations = {
6783         .permission     = nfs_permission,
6784         .getattr        = nfs_getattr,
6785         .setattr        = nfs_setattr,
6786         .getxattr       = generic_getxattr,
6787         .setxattr       = generic_setxattr,
6788         .listxattr      = generic_listxattr,
6789         .removexattr    = generic_removexattr,
6790 };
6791
6792 const struct nfs_rpc_ops nfs_v4_clientops = {
6793         .version        = 4,                    /* protocol version */
6794         .dentry_ops     = &nfs4_dentry_operations,
6795         .dir_inode_ops  = &nfs4_dir_inode_operations,
6796         .file_inode_ops = &nfs4_file_inode_operations,
6797         .file_ops       = &nfs4_file_operations,
6798         .getroot        = nfs4_proc_get_root,
6799         .submount       = nfs4_submount,
6800         .try_mount      = nfs4_try_mount,
6801         .getattr        = nfs4_proc_getattr,
6802         .setattr        = nfs4_proc_setattr,
6803         .lookup         = nfs4_proc_lookup,
6804         .access         = nfs4_proc_access,
6805         .readlink       = nfs4_proc_readlink,
6806         .create         = nfs4_proc_create,
6807         .remove         = nfs4_proc_remove,
6808         .unlink_setup   = nfs4_proc_unlink_setup,
6809         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6810         .unlink_done    = nfs4_proc_unlink_done,
6811         .rename         = nfs4_proc_rename,
6812         .rename_setup   = nfs4_proc_rename_setup,
6813         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6814         .rename_done    = nfs4_proc_rename_done,
6815         .link           = nfs4_proc_link,
6816         .symlink        = nfs4_proc_symlink,
6817         .mkdir          = nfs4_proc_mkdir,
6818         .rmdir          = nfs4_proc_remove,
6819         .readdir        = nfs4_proc_readdir,
6820         .mknod          = nfs4_proc_mknod,
6821         .statfs         = nfs4_proc_statfs,
6822         .fsinfo         = nfs4_proc_fsinfo,
6823         .pathconf       = nfs4_proc_pathconf,
6824         .set_capabilities = nfs4_server_capabilities,
6825         .decode_dirent  = nfs4_decode_dirent,
6826         .read_setup     = nfs4_proc_read_setup,
6827         .read_pageio_init = pnfs_pageio_init_read,
6828         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6829         .read_done      = nfs4_read_done,
6830         .write_setup    = nfs4_proc_write_setup,
6831         .write_pageio_init = pnfs_pageio_init_write,
6832         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6833         .write_done     = nfs4_write_done,
6834         .commit_setup   = nfs4_proc_commit_setup,
6835         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6836         .commit_done    = nfs4_commit_done,
6837         .lock           = nfs4_proc_lock,
6838         .clear_acl_cache = nfs4_zap_acl_attr,
6839         .close_context  = nfs4_close_context,
6840         .open_context   = nfs4_atomic_open,
6841         .have_delegation = nfs4_have_delegation,
6842         .return_delegation = nfs4_inode_return_delegation,
6843         .alloc_client   = nfs4_alloc_client,
6844         .init_client    = nfs4_init_client,
6845         .free_client    = nfs4_free_client,
6846         .create_server  = nfs4_create_server,
6847         .clone_server   = nfs_clone_server,
6848 };
6849
6850 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6851         .prefix = XATTR_NAME_NFSV4_ACL,
6852         .list   = nfs4_xattr_list_nfs4_acl,
6853         .get    = nfs4_xattr_get_nfs4_acl,
6854         .set    = nfs4_xattr_set_nfs4_acl,
6855 };
6856
6857 const struct xattr_handler *nfs4_xattr_handlers[] = {
6858         &nfs4_xattr_nfs4_acl_handler,
6859         NULL
6860 };
6861
6862 /*
6863  * Local variables:
6864  *  c-basic-offset: 8
6865  * End:
6866  */