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/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/nfs_idmap.h>
  56 #include <linux/sunrpc/bc_xprt.h>
  57 #include <linux/xattr.h>
  58 #include <linux/utsname.h>
  59 #include <linux/freezer.h>
  60
  61 #include "nfs4_fs.h"
  62 #include "delegation.h"
  63 #include "internal.h"
  64 #include "iostat.h"
  65 #include "callback.h"
  66 #include "pnfs.h"
  67
  68 #define NFSDBG_FACILITY         NFSDBG_PROC
  69
  70 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  71 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  72
  73 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  74
  75 static unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
  76
  77 struct nfs4_opendata;
  78 static int _nfs4_proc_open(struct nfs4_opendata *data);
  79 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  80 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  81 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  82 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state);
  87 #ifdef CONFIG_NFS_V4_1
  88 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  89 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  90 #endif
  91 /* Prevent leaks of NFSv4 errors into userland */
  92 static int nfs4_map_errors(int err)
  93 {
  94         if (err >= -1000)
  95                 return err;
  96         switch (err) {
  97         case -NFS4ERR_RESOURCE:
  98                 return -EREMOTEIO;
  99         case -NFS4ERR_WRONGSEC:
 100                 return -EPERM;
 101         case -NFS4ERR_BADOWNER:
 102         case -NFS4ERR_BADNAME:
 103                 return -EINVAL;
 104         default:
 105                 dprintk("%s could not handle NFSv4 error %d\n",
 106                                 __func__, -err);
 107                 break;
 108         }
 109         return -EIO;
 110 }
 111
 112 /*
 113  * This is our standard bitmap for GETATTR requests.
 114  */
 115 const u32 nfs4_fattr_bitmap[2] = {
 116         FATTR4_WORD0_TYPE
 117         | FATTR4_WORD0_CHANGE
 118         | FATTR4_WORD0_SIZE
 119         | FATTR4_WORD0_FSID
 120         | FATTR4_WORD0_FILEID,
 121         FATTR4_WORD1_MODE
 122         | FATTR4_WORD1_NUMLINKS
 123         | FATTR4_WORD1_OWNER
 124         | FATTR4_WORD1_OWNER_GROUP
 125         | FATTR4_WORD1_RAWDEV
 126         | FATTR4_WORD1_SPACE_USED
 127         | FATTR4_WORD1_TIME_ACCESS
 128         | FATTR4_WORD1_TIME_METADATA
 129         | FATTR4_WORD1_TIME_MODIFY
 130 };
 131
 132 const u32 nfs4_statfs_bitmap[2] = {
 133         FATTR4_WORD0_FILES_AVAIL
 134         | FATTR4_WORD0_FILES_FREE
 135         | FATTR4_WORD0_FILES_TOTAL,
 136         FATTR4_WORD1_SPACE_AVAIL
 137         | FATTR4_WORD1_SPACE_FREE
 138         | FATTR4_WORD1_SPACE_TOTAL
 139 };
 140
 141 const u32 nfs4_pathconf_bitmap[2] = {
 142         FATTR4_WORD0_MAXLINK
 143         | FATTR4_WORD0_MAXNAME,
 144         0
 145 };
 146
 147 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 148                         | FATTR4_WORD0_MAXREAD
 149                         | FATTR4_WORD0_MAXWRITE
 150                         | FATTR4_WORD0_LEASE_TIME,
 151                         FATTR4_WORD1_TIME_DELTA
 152                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 153                         FATTR4_WORD2_LAYOUT_BLKSIZE
 154 };
 155
 156 const u32 nfs4_fs_locations_bitmap[2] = {
 157         FATTR4_WORD0_TYPE
 158         | FATTR4_WORD0_CHANGE
 159         | FATTR4_WORD0_SIZE
 160         | FATTR4_WORD0_FSID
 161         | FATTR4_WORD0_FILEID
 162         | FATTR4_WORD0_FS_LOCATIONS,
 163         FATTR4_WORD1_MODE
 164         | FATTR4_WORD1_NUMLINKS
 165         | FATTR4_WORD1_OWNER
 166         | FATTR4_WORD1_OWNER_GROUP
 167         | FATTR4_WORD1_RAWDEV
 168         | FATTR4_WORD1_SPACE_USED
 169         | FATTR4_WORD1_TIME_ACCESS
 170         | FATTR4_WORD1_TIME_METADATA
 171         | FATTR4_WORD1_TIME_MODIFY
 172         | FATTR4_WORD1_MOUNTED_ON_FILEID
 173 };
 174
 175 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 176                 struct nfs4_readdir_arg *readdir)
 177 {
 178         __be32 *start, *p;
 179
 180         BUG_ON(readdir->count < 80);
 181         if (cookie > 2) {
 182                 readdir->cookie = cookie;
 183                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 184                 return;
 185         }
 186
 187         readdir->cookie = 0;
 188         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 189         if (cookie == 2)
 190                 return;
 191
 192         /*
 193          * NFSv4 servers do not return entries for '.' and '..'
 194          * Therefore, we fake these entries here.  We let '.'
 195          * have cookie 0 and '..' have cookie 1.  Note that
 196          * when talking to the server, we always send cookie 0
 197          * instead of 1 or 2.
 198          */
 199         start = p = kmap_atomic(*readdir->pages);
 200
 201         if (cookie == 0) {
 202                 *p++ = xdr_one;                                  /* next */
 203                 *p++ = xdr_zero;                   /* cookie, first word */
 204                 *p++ = xdr_one;                   /* cookie, second word */
 205                 *p++ = xdr_one;                             /* entry len */
 206                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 207                 p++;
 208                 *p++ = xdr_one;                         /* bitmap length */
 209                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 210                 *p++ = htonl(8);              /* attribute buffer length */
 211                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 212         }
 213
 214         *p++ = xdr_one;                                  /* next */
 215         *p++ = xdr_zero;                   /* cookie, first word */
 216         *p++ = xdr_two;                   /* cookie, second word */
 217         *p++ = xdr_two;                             /* entry len */
 218         memcpy(p, "..\0\0", 4);                         /* entry */
 219         p++;
 220         *p++ = xdr_one;                         /* bitmap length */
 221         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 222         *p++ = htonl(8);              /* attribute buffer length */
 223         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 224
 225         readdir->pgbase = (char *)p - (char *)start;
 226         readdir->count -= readdir->pgbase;
 227         kunmap_atomic(start);
 228 }
 229
 230 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 231 {
 232         int res;
 233
 234         might_sleep();
 235
 236         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 237                         nfs_wait_bit_killable, TASK_KILLABLE);
 238         return res;
 239 }
 240
 241 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 242 {
 243         int res = 0;
 244
 245         might_sleep();
 246
 247         if (*timeout <= 0)
 248                 *timeout = NFS4_POLL_RETRY_MIN;
 249         if (*timeout > NFS4_POLL_RETRY_MAX)
 250                 *timeout = NFS4_POLL_RETRY_MAX;
 251         freezable_schedule_timeout_killable(*timeout);
 252         if (fatal_signal_pending(current))
 253                 res = -ERESTARTSYS;
 254         *timeout <<= 1;
 255         return res;
 256 }
 257
 258 /* This is the error handling routine for processes that are allowed
 259  * to sleep.
 260  */
 261 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 262 {
 263         struct nfs_client *clp = server->nfs_client;
 264         struct nfs4_state *state = exception->state;
 265         struct inode *inode = exception->inode;
 266         int ret = errorcode;
 267
 268         exception->retry = 0;
 269         switch(errorcode) {
 270                 case 0:
 271                         return 0;
 272                 case -NFS4ERR_OPENMODE:
 273                         if (inode && nfs_have_delegation(inode, FMODE_READ)) {
 274                                 nfs_inode_return_delegation(inode);
 275                                 exception->retry = 1;
 276                                 return 0;
 277                         }
 278                         if (state == NULL)
 279                                 break;
 280                         nfs4_schedule_stateid_recovery(server, state);
 281                         goto wait_on_recovery;
 282                 case -NFS4ERR_DELEG_REVOKED:
 283                 case -NFS4ERR_ADMIN_REVOKED:
 284                 case -NFS4ERR_BAD_STATEID:
 285                         if (state == NULL)
 286                                 break;
 287                         nfs_remove_bad_delegation(state->inode);
 288                         nfs4_schedule_stateid_recovery(server, state);
 289                         goto wait_on_recovery;
 290                 case -NFS4ERR_EXPIRED:
 291                         if (state != NULL)
 292                                 nfs4_schedule_stateid_recovery(server, state);
 293                 case -NFS4ERR_STALE_STATEID:
 294                 case -NFS4ERR_STALE_CLIENTID:
 295                         nfs4_schedule_lease_recovery(clp);
 296                         goto wait_on_recovery;
 297 #if defined(CONFIG_NFS_V4_1)
 298                 case -NFS4ERR_BADSESSION:
 299                 case -NFS4ERR_BADSLOT:
 300                 case -NFS4ERR_BAD_HIGH_SLOT:
 301                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 302                 case -NFS4ERR_DEADSESSION:
 303                 case -NFS4ERR_SEQ_FALSE_RETRY:
 304                 case -NFS4ERR_SEQ_MISORDERED:
 305                         dprintk("%s ERROR: %d Reset session\n", __func__,
 306                                 errorcode);
 307                         nfs4_schedule_session_recovery(clp->cl_session);
 308                         exception->retry = 1;
 309                         break;
 310 #endif /* defined(CONFIG_NFS_V4_1) */
 311                 case -NFS4ERR_FILE_OPEN:
 312                         if (exception->timeout > HZ) {
 313                                 /* We have retried a decent amount, time to
 314                                  * fail
 315                                  */
 316                                 ret = -EBUSY;
 317                                 break;
 318                         }
 319                 case -NFS4ERR_GRACE:
 320                 case -NFS4ERR_DELAY:
 321                 case -EKEYEXPIRED:
 322                         ret = nfs4_delay(server->client, &exception->timeout);
 323                         if (ret != 0)
 324                                 break;
 325                 case -NFS4ERR_RETRY_UNCACHED_REP:
 326                 case -NFS4ERR_OLD_STATEID:
 327                         exception->retry = 1;
 328                         break;
 329                 case -NFS4ERR_BADOWNER:
 330                         /* The following works around a Linux server bug! */
 331                 case -NFS4ERR_BADNAME:
 332                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 333                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 334                                 exception->retry = 1;
 335                                 printk(KERN_WARNING "NFS: v4 server %s "
 336                                                 "does not accept raw "
 337                                                 "uid/gids. "
 338                                                 "Reenabling the idmapper.\n",
 339                                                 server->nfs_client->cl_hostname);
 340                         }
 341         }
 342         /* We failed to handle the error */
 343         return nfs4_map_errors(ret);
 344 wait_on_recovery:
 345         ret = nfs4_wait_clnt_recover(clp);
 346         if (ret == 0)
 347                 exception->retry = 1;
 348         return ret;
 349 }
 350
 351
 352 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 353 {
 354         spin_lock(&clp->cl_lock);
 355         if (time_before(clp->cl_last_renewal,timestamp))
 356                 clp->cl_last_renewal = timestamp;
 357         spin_unlock(&clp->cl_lock);
 358 }
 359
 360 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 361 {
 362         do_renew_lease(server->nfs_client, timestamp);
 363 }
 364
 365 #if defined(CONFIG_NFS_V4_1)
 366
 367 /*
 368  * nfs4_free_slot - free a slot and efficiently update slot table.
 369  *
 370  * freeing a slot is trivially done by clearing its respective bit
 371  * in the bitmap.
 372  * If the freed slotid equals highest_used_slotid we want to update it
 373  * so that the server would be able to size down the slot table if needed,
 374  * otherwise we know that the highest_used_slotid is still in use.
 375  * When updating highest_used_slotid there may be "holes" in the bitmap
 376  * so we need to scan down from highest_used_slotid to 0 looking for the now
 377  * highest slotid in use.
 378  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 379  *
 380  * Must be called while holding tbl->slot_tbl_lock
 381  */
 382 static void
 383 nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
 384 {
 385         BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
 386         /* clear used bit in bitmap */
 387         __clear_bit(slotid, tbl->used_slots);
 388
 389         /* update highest_used_slotid when it is freed */
 390         if (slotid == tbl->highest_used_slotid) {
 391                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 392                 if (slotid < tbl->max_slots)
 393                         tbl->highest_used_slotid = slotid;
 394                 else
 395                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 396         }
 397         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 398                 slotid, tbl->highest_used_slotid);
 399 }
 400
 401 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 402 {
 403         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 404         return true;
 405 }
 406
 407 /*
 408  * Signal state manager thread if session fore channel is drained
 409  */
 410 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 411 {
 412         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 413                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 414                                 nfs4_set_task_privileged, NULL);
 415                 return;
 416         }
 417
 418         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 419                 return;
 420
 421         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 422         complete(&ses->fc_slot_table.complete);
 423 }
 424
 425 /*
 426  * Signal state manager thread if session back channel is drained
 427  */
 428 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 429 {
 430         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 431             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 432                 return;
 433         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 434         complete(&ses->bc_slot_table.complete);
 435 }
 436
 437 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 438 {
 439         struct nfs4_slot_table *tbl;
 440
 441         tbl = &res->sr_session->fc_slot_table;
 442         if (!res->sr_slot) {
 443                 /* just wake up the next guy waiting since
 444                  * we may have not consumed a slot after all */
 445                 dprintk("%s: No slot\n", __func__);
 446                 return;
 447         }
 448
 449         spin_lock(&tbl->slot_tbl_lock);
 450         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 451         nfs4_check_drain_fc_complete(res->sr_session);
 452         spin_unlock(&tbl->slot_tbl_lock);
 453         res->sr_slot = NULL;
 454 }
 455
 456 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 457 {
 458         unsigned long timestamp;
 459         struct nfs_client *clp;
 460
 461         /*
 462          * sr_status remains 1 if an RPC level error occurred. The server
 463          * may or may not have processed the sequence operation..
 464          * Proceed as if the server received and processed the sequence
 465          * operation.
 466          */
 467         if (res->sr_status == 1)
 468                 res->sr_status = NFS_OK;
 469
 470         /* don't increment the sequence number if the task wasn't sent */
 471         if (!RPC_WAS_SENT(task))
 472                 goto out;
 473
 474         /* Check the SEQUENCE operation status */
 475         switch (res->sr_status) {
 476         case 0:
 477                 /* Update the slot's sequence and clientid lease timer */
 478                 ++res->sr_slot->seq_nr;
 479                 timestamp = res->sr_renewal_time;
 480                 clp = res->sr_session->clp;
 481                 do_renew_lease(clp, timestamp);
 482                 /* Check sequence flags */
 483                 if (res->sr_status_flags != 0)
 484                         nfs4_schedule_lease_recovery(clp);
 485                 break;
 486         case -NFS4ERR_DELAY:
 487                 /* The server detected a resend of the RPC call and
 488                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 489                  * of RFC5661.
 490                  */
 491                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 492                         __func__,
 493                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 494                         res->sr_slot->seq_nr);
 495                 goto out_retry;
 496         default:
 497                 /* Just update the slot sequence no. */
 498                 ++res->sr_slot->seq_nr;
 499         }
 500 out:
 501         /* The session may be reset by one of the error handlers. */
 502         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 503         nfs41_sequence_free_slot(res);
 504         return 1;
 505 out_retry:
 506         if (!rpc_restart_call(task))
 507                 goto out;
 508         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 509         return 0;
 510 }
 511
 512 static int nfs4_sequence_done(struct rpc_task *task,
 513                                struct nfs4_sequence_res *res)
 514 {
 515         if (res->sr_session == NULL)
 516                 return 1;
 517         return nfs41_sequence_done(task, res);
 518 }
 519
 520 /*
 521  * nfs4_find_slot - efficiently look for a free slot
 522  *
 523  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 524  * If found, we mark the slot as used, update the highest_used_slotid,
 525  * and respectively set up the sequence operation args.
 526  * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
 527  *
 528  * Note: must be called with under the slot_tbl_lock.
 529  */
 530 static u32
 531 nfs4_find_slot(struct nfs4_slot_table *tbl)
 532 {
 533         u32 slotid;
 534         u32 ret_id = NFS4_NO_SLOT;
 535
 536         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 537                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 538                 tbl->max_slots);
 539         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 540         if (slotid >= tbl->max_slots)
 541                 goto out;
 542         __set_bit(slotid, tbl->used_slots);
 543         if (slotid > tbl->highest_used_slotid ||
 544                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 545                 tbl->highest_used_slotid = slotid;
 546         ret_id = slotid;
 547 out:
 548         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 549                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 550         return ret_id;
 551 }
 552
 553 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 554                 struct nfs4_sequence_res *res, int cache_reply)
 555 {
 556         args->sa_session = NULL;
 557         args->sa_cache_this = 0;
 558         if (cache_reply)
 559                 args->sa_cache_this = 1;
 560         res->sr_session = NULL;
 561         res->sr_slot = NULL;
 562 }
 563
 564 int nfs41_setup_sequence(struct nfs4_session *session,
 565                                 struct nfs4_sequence_args *args,
 566                                 struct nfs4_sequence_res *res,
 567                                 struct rpc_task *task)
 568 {
 569         struct nfs4_slot *slot;
 570         struct nfs4_slot_table *tbl;
 571         u32 slotid;
 572
 573         dprintk("--> %s\n", __func__);
 574         /* slot already allocated? */
 575         if (res->sr_slot != NULL)
 576                 return 0;
 577
 578         tbl = &session->fc_slot_table;
 579
 580         spin_lock(&tbl->slot_tbl_lock);
 581         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 582             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 583                 /* The state manager will wait until the slot table is empty */
 584                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 585                 spin_unlock(&tbl->slot_tbl_lock);
 586                 dprintk("%s session is draining\n", __func__);
 587                 return -EAGAIN;
 588         }
 589
 590         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 591             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 592                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 593                 spin_unlock(&tbl->slot_tbl_lock);
 594                 dprintk("%s enforce FIFO order\n", __func__);
 595                 return -EAGAIN;
 596         }
 597
 598         slotid = nfs4_find_slot(tbl);
 599         if (slotid == NFS4_NO_SLOT) {
 600                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 601                 spin_unlock(&tbl->slot_tbl_lock);
 602                 dprintk("<-- %s: no free slots\n", __func__);
 603                 return -EAGAIN;
 604         }
 605         spin_unlock(&tbl->slot_tbl_lock);
 606
 607         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 608         slot = tbl->slots + slotid;
 609         args->sa_session = session;
 610         args->sa_slotid = slotid;
 611
 612         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 613
 614         res->sr_session = session;
 615         res->sr_slot = slot;
 616         res->sr_renewal_time = jiffies;
 617         res->sr_status_flags = 0;
 618         /*
 619          * sr_status is only set in decode_sequence, and so will remain
 620          * set to 1 if an rpc level failure occurs.
 621          */
 622         res->sr_status = 1;
 623         return 0;
 624 }
 625 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 626
 627 int nfs4_setup_sequence(const struct nfs_server *server,
 628                         struct nfs4_sequence_args *args,
 629                         struct nfs4_sequence_res *res,
 630                         struct rpc_task *task)
 631 {
 632         struct nfs4_session *session = nfs4_get_session(server);
 633         int ret = 0;
 634
 635         if (session == NULL)
 636                 goto out;
 637
 638         dprintk("--> %s clp %p session %p sr_slot %td\n",
 639                 __func__, session->clp, session, res->sr_slot ?
 640                         res->sr_slot - session->fc_slot_table.slots : -1);
 641
 642         ret = nfs41_setup_sequence(session, args, res, task);
 643 out:
 644         dprintk("<-- %s status=%d\n", __func__, ret);
 645         return ret;
 646 }
 647
 648 struct nfs41_call_sync_data {
 649         const struct nfs_server *seq_server;
 650         struct nfs4_sequence_args *seq_args;
 651         struct nfs4_sequence_res *seq_res;
 652 };
 653
 654 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 655 {
 656         struct nfs41_call_sync_data *data = calldata;
 657
 658         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 659
 660         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 661                                 data->seq_res, task))
 662                 return;
 663         rpc_call_start(task);
 664 }
 665
 666 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 667 {
 668         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 669         nfs41_call_sync_prepare(task, calldata);
 670 }
 671
 672 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 673 {
 674         struct nfs41_call_sync_data *data = calldata;
 675
 676         nfs41_sequence_done(task, data->seq_res);
 677 }
 678
 679 static const struct rpc_call_ops nfs41_call_sync_ops = {
 680         .rpc_call_prepare = nfs41_call_sync_prepare,
 681         .rpc_call_done = nfs41_call_sync_done,
 682 };
 683
 684 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 685         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 686         .rpc_call_done = nfs41_call_sync_done,
 687 };
 688
 689 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 690                                    struct nfs_server *server,
 691                                    struct rpc_message *msg,
 692                                    struct nfs4_sequence_args *args,
 693                                    struct nfs4_sequence_res *res,
 694                                    int privileged)
 695 {
 696         int ret;
 697         struct rpc_task *task;
 698         struct nfs41_call_sync_data data = {
 699                 .seq_server = server,
 700                 .seq_args = args,
 701                 .seq_res = res,
 702         };
 703         struct rpc_task_setup task_setup = {
 704                 .rpc_client = clnt,
 705                 .rpc_message = msg,
 706                 .callback_ops = &nfs41_call_sync_ops,
 707                 .callback_data = &data
 708         };
 709
 710         if (privileged)
 711                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 712         task = rpc_run_task(&task_setup);
 713         if (IS_ERR(task))
 714                 ret = PTR_ERR(task);
 715         else {
 716                 ret = task->tk_status;
 717                 rpc_put_task(task);
 718         }
 719         return ret;
 720 }
 721
 722 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 723                             struct nfs_server *server,
 724                             struct rpc_message *msg,
 725                             struct nfs4_sequence_args *args,
 726                             struct nfs4_sequence_res *res,
 727                             int cache_reply)
 728 {
 729         nfs41_init_sequence(args, res, cache_reply);
 730         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 731 }
 732
 733 #else
 734 static inline
 735 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 736                 struct nfs4_sequence_res *res, int cache_reply)
 737 {
 738 }
 739
 740 static int nfs4_sequence_done(struct rpc_task *task,
 741                                struct nfs4_sequence_res *res)
 742 {
 743         return 1;
 744 }
 745 #endif /* CONFIG_NFS_V4_1 */
 746
 747 int _nfs4_call_sync(struct rpc_clnt *clnt,
 748                     struct nfs_server *server,
 749                     struct rpc_message *msg,
 750                     struct nfs4_sequence_args *args,
 751                     struct nfs4_sequence_res *res,
 752                     int cache_reply)
 753 {
 754         nfs41_init_sequence(args, res, cache_reply);
 755         return rpc_call_sync(clnt, msg, 0);
 756 }
 757
 758 static inline
 759 int nfs4_call_sync(struct rpc_clnt *clnt,
 760                    struct nfs_server *server,
 761                    struct rpc_message *msg,
 762                    struct nfs4_sequence_args *args,
 763                    struct nfs4_sequence_res *res,
 764                    int cache_reply)
 765 {
 766         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 767                                                 args, res, cache_reply);
 768 }
 769
 770 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 771 {
 772         struct nfs_inode *nfsi = NFS_I(dir);
 773
 774         spin_lock(&dir->i_lock);
 775         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 776         if (!cinfo->atomic || cinfo->before != dir->i_version)
 777                 nfs_force_lookup_revalidate(dir);
 778         dir->i_version = cinfo->after;
 779         spin_unlock(&dir->i_lock);
 780 }
 781
 782 struct nfs4_opendata {
 783         struct kref kref;
 784         struct nfs_openargs o_arg;
 785         struct nfs_openres o_res;
 786         struct nfs_open_confirmargs c_arg;
 787         struct nfs_open_confirmres c_res;
 788         struct nfs4_string owner_name;
 789         struct nfs4_string group_name;
 790         struct nfs_fattr f_attr;
 791         struct nfs_fattr dir_attr;
 792         struct dentry *dir;
 793         struct dentry *dentry;
 794         struct nfs4_state_owner *owner;
 795         struct nfs4_state *state;
 796         struct iattr attrs;
 797         unsigned long timestamp;
 798         unsigned int rpc_done : 1;
 799         int rpc_status;
 800         int cancelled;
 801 };
 802
 803
 804 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 805 {
 806         p->o_res.f_attr = &p->f_attr;
 807         p->o_res.dir_attr = &p->dir_attr;
 808         p->o_res.seqid = p->o_arg.seqid;
 809         p->c_res.seqid = p->c_arg.seqid;
 810         p->o_res.server = p->o_arg.server;
 811         nfs_fattr_init(&p->f_attr);
 812         nfs_fattr_init(&p->dir_attr);
 813         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 814 }
 815
 816 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 817                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 818                 const struct iattr *attrs,
 819                 gfp_t gfp_mask)
 820 {
 821         struct dentry *parent = dget_parent(dentry);
 822         struct inode *dir = parent->d_inode;
 823         struct nfs_server *server = NFS_SERVER(dir);
 824         struct nfs4_opendata *p;
 825
 826         p = kzalloc(sizeof(*p), gfp_mask);
 827         if (p == NULL)
 828                 goto err;
 829         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 830         if (p->o_arg.seqid == NULL)
 831                 goto err_free;
 832         nfs_sb_active(dentry->d_sb);
 833         p->dentry = dget(dentry);
 834         p->dir = parent;
 835         p->owner = sp;
 836         atomic_inc(&sp->so_count);
 837         p->o_arg.fh = NFS_FH(dir);
 838         p->o_arg.open_flags = flags;
 839         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 840         p->o_arg.clientid = server->nfs_client->cl_clientid;
 841         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 842         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 843         p->o_arg.name = &dentry->d_name;
 844         p->o_arg.server = server;
 845         p->o_arg.bitmask = server->attr_bitmask;
 846         p->o_arg.dir_bitmask = server->cache_consistency_bitmask;
 847         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 848         if (attrs != NULL && attrs->ia_valid != 0) {
 849                 __be32 verf[2];
 850
 851                 p->o_arg.u.attrs = &p->attrs;
 852                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 853
 854                 verf[0] = jiffies;
 855                 verf[1] = current->pid;
 856                 memcpy(p->o_arg.u.verifier.data, verf,
 857                                 sizeof(p->o_arg.u.verifier.data));
 858         }
 859         p->c_arg.fh = &p->o_res.fh;
 860         p->c_arg.stateid = &p->o_res.stateid;
 861         p->c_arg.seqid = p->o_arg.seqid;
 862         nfs4_init_opendata_res(p);
 863         kref_init(&p->kref);
 864         return p;
 865 err_free:
 866         kfree(p);
 867 err:
 868         dput(parent);
 869         return NULL;
 870 }
 871
 872 static void nfs4_opendata_free(struct kref *kref)
 873 {
 874         struct nfs4_opendata *p = container_of(kref,
 875                         struct nfs4_opendata, kref);
 876         struct super_block *sb = p->dentry->d_sb;
 877
 878         nfs_free_seqid(p->o_arg.seqid);
 879         if (p->state != NULL)
 880                 nfs4_put_open_state(p->state);
 881         nfs4_put_state_owner(p->owner);
 882         dput(p->dir);
 883         dput(p->dentry);
 884         nfs_sb_deactive(sb);
 885         nfs_fattr_free_names(&p->f_attr);
 886         kfree(p);
 887 }
 888
 889 static void nfs4_opendata_put(struct nfs4_opendata *p)
 890 {
 891         if (p != NULL)
 892                 kref_put(&p->kref, nfs4_opendata_free);
 893 }
 894
 895 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 896 {
 897         int ret;
 898
 899         ret = rpc_wait_for_completion_task(task);
 900         return ret;
 901 }
 902
 903 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 904 {
 905         int ret = 0;
 906
 907         if (open_mode & (O_EXCL|O_TRUNC))
 908                 goto out;
 909         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 910                 case FMODE_READ:
 911                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 912                                 && state->n_rdonly != 0;
 913                         break;
 914                 case FMODE_WRITE:
 915                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 916                                 && state->n_wronly != 0;
 917                         break;
 918                 case FMODE_READ|FMODE_WRITE:
 919                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 920                                 && state->n_rdwr != 0;
 921         }
 922 out:
 923         return ret;
 924 }
 925
 926 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 927 {
 928         if (delegation == NULL)
 929                 return 0;
 930         if ((delegation->type & fmode) != fmode)
 931                 return 0;
 932         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 933                 return 0;
 934         nfs_mark_delegation_referenced(delegation);
 935         return 1;
 936 }
 937
 938 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 939 {
 940         switch (fmode) {
 941                 case FMODE_WRITE:
 942                         state->n_wronly++;
 943                         break;
 944                 case FMODE_READ:
 945                         state->n_rdonly++;
 946                         break;
 947                 case FMODE_READ|FMODE_WRITE:
 948                         state->n_rdwr++;
 949         }
 950         nfs4_state_set_mode_locked(state, state->state | fmode);
 951 }
 952
 953 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 954 {
 955         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 956                 nfs4_stateid_copy(&state->stateid, stateid);
 957         nfs4_stateid_copy(&state->open_stateid, stateid);
 958         switch (fmode) {
 959                 case FMODE_READ:
 960                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 961                         break;
 962                 case FMODE_WRITE:
 963                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 964                         break;
 965                 case FMODE_READ|FMODE_WRITE:
 966                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 967         }
 968 }
 969
 970 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 971 {
 972         write_seqlock(&state->seqlock);
 973         nfs_set_open_stateid_locked(state, stateid, fmode);
 974         write_sequnlock(&state->seqlock);
 975 }
 976
 977 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 978 {
 979         /*
 980          * Protect the call to nfs4_state_set_mode_locked and
 981          * serialise the stateid update
 982          */
 983         write_seqlock(&state->seqlock);
 984         if (deleg_stateid != NULL) {
 985                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 986                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 987         }
 988         if (open_stateid != NULL)
 989                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 990         write_sequnlock(&state->seqlock);
 991         spin_lock(&state->owner->so_lock);
 992         update_open_stateflags(state, fmode);
 993         spin_unlock(&state->owner->so_lock);
 994 }
 995
 996 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 997 {
 998         struct nfs_inode *nfsi = NFS_I(state->inode);
 999         struct nfs_delegation *deleg_cur;
1000         int ret = 0;
1001
1002         fmode &= (FMODE_READ|FMODE_WRITE);
1003
1004         rcu_read_lock();
1005         deleg_cur = rcu_dereference(nfsi->delegation);
1006         if (deleg_cur == NULL)
1007                 goto no_delegation;
1008
1009         spin_lock(&deleg_cur->lock);
1010         if (nfsi->delegation != deleg_cur ||
1011             (deleg_cur->type & fmode) != fmode)
1012                 goto no_delegation_unlock;
1013
1014         if (delegation == NULL)
1015                 delegation = &deleg_cur->stateid;
1016         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1017                 goto no_delegation_unlock;
1018
1019         nfs_mark_delegation_referenced(deleg_cur);
1020         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1021         ret = 1;
1022 no_delegation_unlock:
1023         spin_unlock(&deleg_cur->lock);
1024 no_delegation:
1025         rcu_read_unlock();
1026
1027         if (!ret && open_stateid != NULL) {
1028                 __update_open_stateid(state, open_stateid, NULL, fmode);
1029                 ret = 1;
1030         }
1031
1032         return ret;
1033 }
1034
1035
1036 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1037 {
1038         struct nfs_delegation *delegation;
1039
1040         rcu_read_lock();
1041         delegation = rcu_dereference(NFS_I(inode)->delegation);
1042         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1043                 rcu_read_unlock();
1044                 return;
1045         }
1046         rcu_read_unlock();
1047         nfs_inode_return_delegation(inode);
1048 }
1049
1050 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1051 {
1052         struct nfs4_state *state = opendata->state;
1053         struct nfs_inode *nfsi = NFS_I(state->inode);
1054         struct nfs_delegation *delegation;
1055         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1056         fmode_t fmode = opendata->o_arg.fmode;
1057         nfs4_stateid stateid;
1058         int ret = -EAGAIN;
1059
1060         for (;;) {
1061                 if (can_open_cached(state, fmode, open_mode)) {
1062                         spin_lock(&state->owner->so_lock);
1063                         if (can_open_cached(state, fmode, open_mode)) {
1064                                 update_open_stateflags(state, fmode);
1065                                 spin_unlock(&state->owner->so_lock);
1066                                 goto out_return_state;
1067                         }
1068                         spin_unlock(&state->owner->so_lock);
1069                 }
1070                 rcu_read_lock();
1071                 delegation = rcu_dereference(nfsi->delegation);
1072                 if (!can_open_delegated(delegation, fmode)) {
1073                         rcu_read_unlock();
1074                         break;
1075                 }
1076                 /* Save the delegation */
1077                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1078                 rcu_read_unlock();
1079                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1080                 if (ret != 0)
1081                         goto out;
1082                 ret = -EAGAIN;
1083
1084                 /* Try to update the stateid using the delegation */
1085                 if (update_open_stateid(state, NULL, &stateid, fmode))
1086                         goto out_return_state;
1087         }
1088 out:
1089         return ERR_PTR(ret);
1090 out_return_state:
1091         atomic_inc(&state->count);
1092         return state;
1093 }
1094
1095 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1096 {
1097         struct inode *inode;
1098         struct nfs4_state *state = NULL;
1099         struct nfs_delegation *delegation;
1100         int ret;
1101
1102         if (!data->rpc_done) {
1103                 state = nfs4_try_open_cached(data);
1104                 goto out;
1105         }
1106
1107         ret = -EAGAIN;
1108         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1109                 goto err;
1110         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1111         ret = PTR_ERR(inode);
1112         if (IS_ERR(inode))
1113                 goto err;
1114         ret = -ENOMEM;
1115         state = nfs4_get_open_state(inode, data->owner);
1116         if (state == NULL)
1117                 goto err_put_inode;
1118         if (data->o_res.delegation_type != 0) {
1119                 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1120                 int delegation_flags = 0;
1121
1122                 rcu_read_lock();
1123                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1124                 if (delegation)
1125                         delegation_flags = delegation->flags;
1126                 rcu_read_unlock();
1127                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1128                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1129                                         "returning a delegation for "
1130                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1131                                         clp->cl_hostname);
1132                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1133                         nfs_inode_set_delegation(state->inode,
1134                                         data->owner->so_cred,
1135                                         &data->o_res);
1136                 else
1137                         nfs_inode_reclaim_delegation(state->inode,
1138                                         data->owner->so_cred,
1139                                         &data->o_res);
1140         }
1141
1142         update_open_stateid(state, &data->o_res.stateid, NULL,
1143                         data->o_arg.fmode);
1144         iput(inode);
1145 out:
1146         return state;
1147 err_put_inode:
1148         iput(inode);
1149 err:
1150         return ERR_PTR(ret);
1151 }
1152
1153 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1154 {
1155         struct nfs_inode *nfsi = NFS_I(state->inode);
1156         struct nfs_open_context *ctx;
1157
1158         spin_lock(&state->inode->i_lock);
1159         list_for_each_entry(ctx, &nfsi->open_files, list) {
1160                 if (ctx->state != state)
1161                         continue;
1162                 get_nfs_open_context(ctx);
1163                 spin_unlock(&state->inode->i_lock);
1164                 return ctx;
1165         }
1166         spin_unlock(&state->inode->i_lock);
1167         return ERR_PTR(-ENOENT);
1168 }
1169
1170 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1171 {
1172         struct nfs4_opendata *opendata;
1173
1174         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1175         if (opendata == NULL)
1176                 return ERR_PTR(-ENOMEM);
1177         opendata->state = state;
1178         atomic_inc(&state->count);
1179         return opendata;
1180 }
1181
1182 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1183 {
1184         struct nfs4_state *newstate;
1185         int ret;
1186
1187         opendata->o_arg.open_flags = 0;
1188         opendata->o_arg.fmode = fmode;
1189         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1190         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1191         nfs4_init_opendata_res(opendata);
1192         ret = _nfs4_recover_proc_open(opendata);
1193         if (ret != 0)
1194                 return ret;
1195         newstate = nfs4_opendata_to_nfs4_state(opendata);
1196         if (IS_ERR(newstate))
1197                 return PTR_ERR(newstate);
1198         nfs4_close_state(newstate, fmode);
1199         *res = newstate;
1200         return 0;
1201 }
1202
1203 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1204 {
1205         struct nfs4_state *newstate;
1206         int ret;
1207
1208         /* memory barrier prior to reading state->n_* */
1209         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1210         smp_rmb();
1211         if (state->n_rdwr != 0) {
1212                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1213                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1214                 if (ret != 0)
1215                         return ret;
1216                 if (newstate != state)
1217                         return -ESTALE;
1218         }
1219         if (state->n_wronly != 0) {
1220                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1221                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1222                 if (ret != 0)
1223                         return ret;
1224                 if (newstate != state)
1225                         return -ESTALE;
1226         }
1227         if (state->n_rdonly != 0) {
1228                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1229                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1230                 if (ret != 0)
1231                         return ret;
1232                 if (newstate != state)
1233                         return -ESTALE;
1234         }
1235         /*
1236          * We may have performed cached opens for all three recoveries.
1237          * Check if we need to update the current stateid.
1238          */
1239         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1240             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1241                 write_seqlock(&state->seqlock);
1242                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1243                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1244                 write_sequnlock(&state->seqlock);
1245         }
1246         return 0;
1247 }
1248
1249 /*
1250  * OPEN_RECLAIM:
1251  *      reclaim state on the server after a reboot.
1252  */
1253 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1254 {
1255         struct nfs_delegation *delegation;
1256         struct nfs4_opendata *opendata;
1257         fmode_t delegation_type = 0;
1258         int status;
1259
1260         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1261         if (IS_ERR(opendata))
1262                 return PTR_ERR(opendata);
1263         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1264         opendata->o_arg.fh = NFS_FH(state->inode);
1265         rcu_read_lock();
1266         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1267         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1268                 delegation_type = delegation->type;
1269         rcu_read_unlock();
1270         opendata->o_arg.u.delegation_type = delegation_type;
1271         status = nfs4_open_recover(opendata, state);
1272         nfs4_opendata_put(opendata);
1273         return status;
1274 }
1275
1276 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1277 {
1278         struct nfs_server *server = NFS_SERVER(state->inode);
1279         struct nfs4_exception exception = { };
1280         int err;
1281         do {
1282                 err = _nfs4_do_open_reclaim(ctx, state);
1283                 if (err != -NFS4ERR_DELAY)
1284                         break;
1285                 nfs4_handle_exception(server, err, &exception);
1286         } while (exception.retry);
1287         return err;
1288 }
1289
1290 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1291 {
1292         struct nfs_open_context *ctx;
1293         int ret;
1294
1295         ctx = nfs4_state_find_open_context(state);
1296         if (IS_ERR(ctx))
1297                 return PTR_ERR(ctx);
1298         ret = nfs4_do_open_reclaim(ctx, state);
1299         put_nfs_open_context(ctx);
1300         return ret;
1301 }
1302
1303 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1304 {
1305         struct nfs4_opendata *opendata;
1306         int ret;
1307
1308         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1309         if (IS_ERR(opendata))
1310                 return PTR_ERR(opendata);
1311         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1312         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1313         ret = nfs4_open_recover(opendata, state);
1314         nfs4_opendata_put(opendata);
1315         return ret;
1316 }
1317
1318 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1319 {
1320         struct nfs4_exception exception = { };
1321         struct nfs_server *server = NFS_SERVER(state->inode);
1322         int err;
1323         do {
1324                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1325                 switch (err) {
1326                         case 0:
1327                         case -ENOENT:
1328                         case -ESTALE:
1329                                 goto out;
1330                         case -NFS4ERR_BADSESSION:
1331                         case -NFS4ERR_BADSLOT:
1332                         case -NFS4ERR_BAD_HIGH_SLOT:
1333                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1334                         case -NFS4ERR_DEADSESSION:
1335                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1336                                 goto out;
1337                         case -NFS4ERR_STALE_CLIENTID:
1338                         case -NFS4ERR_STALE_STATEID:
1339                         case -NFS4ERR_EXPIRED:
1340                                 /* Don't recall a delegation if it was lost */
1341                                 nfs4_schedule_lease_recovery(server->nfs_client);
1342                                 goto out;
1343                         case -ERESTARTSYS:
1344                                 /*
1345                                  * The show must go on: exit, but mark the
1346                                  * stateid as needing recovery.
1347                                  */
1348                         case -NFS4ERR_DELEG_REVOKED:
1349                         case -NFS4ERR_ADMIN_REVOKED:
1350                         case -NFS4ERR_BAD_STATEID:
1351                                 nfs_inode_find_state_and_recover(state->inode,
1352                                                 stateid);
1353                                 nfs4_schedule_stateid_recovery(server, state);
1354                         case -EKEYEXPIRED:
1355                                 /*
1356                                  * User RPCSEC_GSS context has expired.
1357                                  * We cannot recover this stateid now, so
1358                                  * skip it and allow recovery thread to
1359                                  * proceed.
1360                                  */
1361                         case -ENOMEM:
1362                                 err = 0;
1363                                 goto out;
1364                 }
1365                 err = nfs4_handle_exception(server, err, &exception);
1366         } while (exception.retry);
1367 out:
1368         return err;
1369 }
1370
1371 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1372 {
1373         struct nfs4_opendata *data = calldata;
1374
1375         data->rpc_status = task->tk_status;
1376         if (data->rpc_status == 0) {
1377                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1378                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1379                 renew_lease(data->o_res.server, data->timestamp);
1380                 data->rpc_done = 1;
1381         }
1382 }
1383
1384 static void nfs4_open_confirm_release(void *calldata)
1385 {
1386         struct nfs4_opendata *data = calldata;
1387         struct nfs4_state *state = NULL;
1388
1389         /* If this request hasn't been cancelled, do nothing */
1390         if (data->cancelled == 0)
1391                 goto out_free;
1392         /* In case of error, no cleanup! */
1393         if (!data->rpc_done)
1394                 goto out_free;
1395         state = nfs4_opendata_to_nfs4_state(data);
1396         if (!IS_ERR(state))
1397                 nfs4_close_state(state, data->o_arg.fmode);
1398 out_free:
1399         nfs4_opendata_put(data);
1400 }
1401
1402 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1403         .rpc_call_done = nfs4_open_confirm_done,
1404         .rpc_release = nfs4_open_confirm_release,
1405 };
1406
1407 /*
1408  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1409  */
1410 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1411 {
1412         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1413         struct rpc_task *task;
1414         struct  rpc_message msg = {
1415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1416                 .rpc_argp = &data->c_arg,
1417                 .rpc_resp = &data->c_res,
1418                 .rpc_cred = data->owner->so_cred,
1419         };
1420         struct rpc_task_setup task_setup_data = {
1421                 .rpc_client = server->client,
1422                 .rpc_message = &msg,
1423                 .callback_ops = &nfs4_open_confirm_ops,
1424                 .callback_data = data,
1425                 .workqueue = nfsiod_workqueue,
1426                 .flags = RPC_TASK_ASYNC,
1427         };
1428         int status;
1429
1430         kref_get(&data->kref);
1431         data->rpc_done = 0;
1432         data->rpc_status = 0;
1433         data->timestamp = jiffies;
1434         task = rpc_run_task(&task_setup_data);
1435         if (IS_ERR(task))
1436                 return PTR_ERR(task);
1437         status = nfs4_wait_for_completion_rpc_task(task);
1438         if (status != 0) {
1439                 data->cancelled = 1;
1440                 smp_wmb();
1441         } else
1442                 status = data->rpc_status;
1443         rpc_put_task(task);
1444         return status;
1445 }
1446
1447 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1448 {
1449         struct nfs4_opendata *data = calldata;
1450         struct nfs4_state_owner *sp = data->owner;
1451
1452         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1453                 return;
1454         /*
1455          * Check if we still need to send an OPEN call, or if we can use
1456          * a delegation instead.
1457          */
1458         if (data->state != NULL) {
1459                 struct nfs_delegation *delegation;
1460
1461                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1462                         goto out_no_action;
1463                 rcu_read_lock();
1464                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1465                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1466                     can_open_delegated(delegation, data->o_arg.fmode))
1467                         goto unlock_no_action;
1468                 rcu_read_unlock();
1469         }
1470         /* Update client id. */
1471         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1472         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1473                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1474                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1475         }
1476         data->timestamp = jiffies;
1477         if (nfs4_setup_sequence(data->o_arg.server,
1478                                 &data->o_arg.seq_args,
1479                                 &data->o_res.seq_res, task))
1480                 return;
1481         rpc_call_start(task);
1482         return;
1483 unlock_no_action:
1484         rcu_read_unlock();
1485 out_no_action:
1486         task->tk_action = NULL;
1487
1488 }
1489
1490 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1491 {
1492         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1493         nfs4_open_prepare(task, calldata);
1494 }
1495
1496 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1497 {
1498         struct nfs4_opendata *data = calldata;
1499
1500         data->rpc_status = task->tk_status;
1501
1502         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1503                 return;
1504
1505         if (task->tk_status == 0) {
1506                 switch (data->o_res.f_attr->mode & S_IFMT) {
1507                         case S_IFREG:
1508                                 break;
1509                         case S_IFLNK:
1510                                 data->rpc_status = -ELOOP;
1511                                 break;
1512                         case S_IFDIR:
1513                                 data->rpc_status = -EISDIR;
1514                                 break;
1515                         default:
1516                                 data->rpc_status = -ENOTDIR;
1517                 }
1518                 renew_lease(data->o_res.server, data->timestamp);
1519                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1520                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1521         }
1522         data->rpc_done = 1;
1523 }
1524
1525 static void nfs4_open_release(void *calldata)
1526 {
1527         struct nfs4_opendata *data = calldata;
1528         struct nfs4_state *state = NULL;
1529
1530         /* If this request hasn't been cancelled, do nothing */
1531         if (data->cancelled == 0)
1532                 goto out_free;
1533         /* In case of error, no cleanup! */
1534         if (data->rpc_status != 0 || !data->rpc_done)
1535                 goto out_free;
1536         /* In case we need an open_confirm, no cleanup! */
1537         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1538                 goto out_free;
1539         state = nfs4_opendata_to_nfs4_state(data);
1540         if (!IS_ERR(state))
1541                 nfs4_close_state(state, data->o_arg.fmode);
1542 out_free:
1543         nfs4_opendata_put(data);
1544 }
1545
1546 static const struct rpc_call_ops nfs4_open_ops = {
1547         .rpc_call_prepare = nfs4_open_prepare,
1548         .rpc_call_done = nfs4_open_done,
1549         .rpc_release = nfs4_open_release,
1550 };
1551
1552 static const struct rpc_call_ops nfs4_recover_open_ops = {
1553         .rpc_call_prepare = nfs4_recover_open_prepare,
1554         .rpc_call_done = nfs4_open_done,
1555         .rpc_release = nfs4_open_release,
1556 };
1557
1558 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1559 {
1560         struct inode *dir = data->dir->d_inode;
1561         struct nfs_server *server = NFS_SERVER(dir);
1562         struct nfs_openargs *o_arg = &data->o_arg;
1563         struct nfs_openres *o_res = &data->o_res;
1564         struct rpc_task *task;
1565         struct rpc_message msg = {
1566                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1567                 .rpc_argp = o_arg,
1568                 .rpc_resp = o_res,
1569                 .rpc_cred = data->owner->so_cred,
1570         };
1571         struct rpc_task_setup task_setup_data = {
1572                 .rpc_client = server->client,
1573                 .rpc_message = &msg,
1574                 .callback_ops = &nfs4_open_ops,
1575                 .callback_data = data,
1576                 .workqueue = nfsiod_workqueue,
1577                 .flags = RPC_TASK_ASYNC,
1578         };
1579         int status;
1580
1581         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1582         kref_get(&data->kref);
1583         data->rpc_done = 0;
1584         data->rpc_status = 0;
1585         data->cancelled = 0;
1586         if (isrecover)
1587                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1588         task = rpc_run_task(&task_setup_data);
1589         if (IS_ERR(task))
1590                 return PTR_ERR(task);
1591         status = nfs4_wait_for_completion_rpc_task(task);
1592         if (status != 0) {
1593                 data->cancelled = 1;
1594                 smp_wmb();
1595         } else
1596                 status = data->rpc_status;
1597         rpc_put_task(task);
1598
1599         return status;
1600 }
1601
1602 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1603 {
1604         struct inode *dir = data->dir->d_inode;
1605         struct nfs_openres *o_res = &data->o_res;
1606         int status;
1607
1608         status = nfs4_run_open_task(data, 1);
1609         if (status != 0 || !data->rpc_done)
1610                 return status;
1611
1612         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1613
1614         nfs_refresh_inode(dir, o_res->dir_attr);
1615
1616         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1617                 status = _nfs4_proc_open_confirm(data);
1618                 if (status != 0)
1619                         return status;
1620         }
1621
1622         return status;
1623 }
1624
1625 /*
1626  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1627  */
1628 static int _nfs4_proc_open(struct nfs4_opendata *data)
1629 {
1630         struct inode *dir = data->dir->d_inode;
1631         struct nfs_server *server = NFS_SERVER(dir);
1632         struct nfs_openargs *o_arg = &data->o_arg;
1633         struct nfs_openres *o_res = &data->o_res;
1634         int status;
1635
1636         status = nfs4_run_open_task(data, 0);
1637         if (!data->rpc_done)
1638                 return status;
1639         if (status != 0) {
1640                 if (status == -NFS4ERR_BADNAME &&
1641                                 !(o_arg->open_flags & O_CREAT))
1642                         return -ENOENT;
1643                 return status;
1644         }
1645
1646         nfs_fattr_map_and_free_names(server, &data->f_attr);
1647
1648         if (o_arg->open_flags & O_CREAT) {
1649                 update_changeattr(dir, &o_res->cinfo);
1650                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1651         } else
1652                 nfs_refresh_inode(dir, o_res->dir_attr);
1653         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1654                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1655         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1656                 status = _nfs4_proc_open_confirm(data);
1657                 if (status != 0)
1658                         return status;
1659         }
1660         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1661                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1662         return 0;
1663 }
1664
1665 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1666 {
1667         unsigned int loop;
1668         int ret;
1669
1670         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1671                 ret = nfs4_wait_clnt_recover(clp);
1672                 if (ret != 0)
1673                         break;
1674                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1675                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1676                         break;
1677                 nfs4_schedule_state_manager(clp);
1678                 ret = -EIO;
1679         }
1680         return ret;
1681 }
1682
1683 static int nfs4_recover_expired_lease(struct nfs_server *server)
1684 {
1685         return nfs4_client_recover_expired_lease(server->nfs_client);
1686 }
1687
1688 /*
1689  * OPEN_EXPIRED:
1690  *      reclaim state on the server after a network partition.
1691  *      Assumes caller holds the appropriate lock
1692  */
1693 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1694 {
1695         struct nfs4_opendata *opendata;
1696         int ret;
1697
1698         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1699         if (IS_ERR(opendata))
1700                 return PTR_ERR(opendata);
1701         ret = nfs4_open_recover(opendata, state);
1702         if (ret == -ESTALE)
1703                 d_drop(ctx->dentry);
1704         nfs4_opendata_put(opendata);
1705         return ret;
1706 }
1707
1708 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1709 {
1710         struct nfs_server *server = NFS_SERVER(state->inode);
1711         struct nfs4_exception exception = { };
1712         int err;
1713
1714         do {
1715                 err = _nfs4_open_expired(ctx, state);
1716                 switch (err) {
1717                 default:
1718                         goto out;
1719                 case -NFS4ERR_GRACE:
1720                 case -NFS4ERR_DELAY:
1721                         nfs4_handle_exception(server, err, &exception);
1722                         err = 0;
1723                 }
1724         } while (exception.retry);
1725 out:
1726         return err;
1727 }
1728
1729 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1730 {
1731         struct nfs_open_context *ctx;
1732         int ret;
1733
1734         ctx = nfs4_state_find_open_context(state);
1735         if (IS_ERR(ctx))
1736                 return PTR_ERR(ctx);
1737         ret = nfs4_do_open_expired(ctx, state);
1738         put_nfs_open_context(ctx);
1739         return ret;
1740 }
1741
1742 #if defined(CONFIG_NFS_V4_1)
1743 static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1744 {
1745         int status = NFS_OK;
1746         struct nfs_server *server = NFS_SERVER(state->inode);
1747
1748         if (state->flags & flags) {
1749                 status = nfs41_test_stateid(server, stateid);
1750                 if (status != NFS_OK) {
1751                         nfs41_free_stateid(server, stateid);
1752                         state->flags &= ~flags;
1753                 }
1754         }
1755         return status;
1756 }
1757
1758 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1759 {
1760         int deleg_status, open_status;
1761         int deleg_flags = 1 << NFS_DELEGATED_STATE;
1762         int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1763
1764         deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1765         open_status = nfs41_check_expired_stateid(state,  &state->open_stateid, open_flags);
1766
1767         if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1768                 return NFS_OK;
1769         return nfs4_open_expired(sp, state);
1770 }
1771 #endif
1772
1773 /*
1774  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1775  * fields corresponding to attributes that were used to store the verifier.
1776  * Make sure we clobber those fields in the later setattr call
1777  */
1778 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1779 {
1780         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1781             !(sattr->ia_valid & ATTR_ATIME_SET))
1782                 sattr->ia_valid |= ATTR_ATIME;
1783
1784         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1785             !(sattr->ia_valid & ATTR_MTIME_SET))
1786                 sattr->ia_valid |= ATTR_MTIME;
1787 }
1788
1789 /*
1790  * Returns a referenced nfs4_state
1791  */
1792 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1793 {
1794         struct nfs4_state_owner  *sp;
1795         struct nfs4_state     *state = NULL;
1796         struct nfs_server       *server = NFS_SERVER(dir);
1797         struct nfs4_opendata *opendata;
1798         int status;
1799
1800         /* Protect against reboot recovery conflicts */
1801         status = -ENOMEM;
1802         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1803         if (sp == NULL) {
1804                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1805                 goto out_err;
1806         }
1807         status = nfs4_recover_expired_lease(server);
1808         if (status != 0)
1809                 goto err_put_state_owner;
1810         if (dentry->d_inode != NULL)
1811                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1812         status = -ENOMEM;
1813         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1814         if (opendata == NULL)
1815                 goto err_put_state_owner;
1816
1817         if (dentry->d_inode != NULL)
1818                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1819
1820         status = _nfs4_proc_open(opendata);
1821         if (status != 0)
1822                 goto err_opendata_put;
1823
1824         state = nfs4_opendata_to_nfs4_state(opendata);
1825         status = PTR_ERR(state);
1826         if (IS_ERR(state))
1827                 goto err_opendata_put;
1828         if (server->caps & NFS_CAP_POSIX_LOCK)
1829                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1830
1831         if (opendata->o_arg.open_flags & O_EXCL) {
1832                 nfs4_exclusive_attrset(opendata, sattr);
1833
1834                 nfs_fattr_init(opendata->o_res.f_attr);
1835                 status = nfs4_do_setattr(state->inode, cred,
1836                                 opendata->o_res.f_attr, sattr,
1837                                 state);
1838                 if (status == 0)
1839                         nfs_setattr_update_inode(state->inode, sattr);
1840                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1841         }
1842         nfs4_opendata_put(opendata);
1843         nfs4_put_state_owner(sp);
1844         *res = state;
1845         return 0;
1846 err_opendata_put:
1847         nfs4_opendata_put(opendata);
1848 err_put_state_owner:
1849         nfs4_put_state_owner(sp);
1850 out_err:
1851         *res = NULL;
1852         return status;
1853 }
1854
1855
1856 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1857 {
1858         struct nfs4_exception exception = { };
1859         struct nfs4_state *res;
1860         int status;
1861
1862         do {
1863                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1864                 if (status == 0)
1865                         break;
1866                 /* NOTE: BAD_SEQID means the server and client disagree about the
1867                  * book-keeping w.r.t. state-changing operations
1868                  * (OPEN/CLOSE/LOCK/LOCKU...)
1869                  * It is actually a sign of a bug on the client or on the server.
1870                  *
1871                  * If we receive a BAD_SEQID error in the particular case of
1872                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1873                  * have unhashed the old state_owner for us, and that we can
1874                  * therefore safely retry using a new one. We should still warn
1875                  * the user though...
1876                  */
1877                 if (status == -NFS4ERR_BAD_SEQID) {
1878                         pr_warn_ratelimited("NFS: v4 server %s "
1879                                         " returned a bad sequence-id error!\n",
1880                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1881                         exception.retry = 1;
1882                         continue;
1883                 }
1884                 /*
1885                  * BAD_STATEID on OPEN means that the server cancelled our
1886                  * state before it received the OPEN_CONFIRM.
1887                  * Recover by retrying the request as per the discussion
1888                  * on Page 181 of RFC3530.
1889                  */
1890                 if (status == -NFS4ERR_BAD_STATEID) {
1891                         exception.retry = 1;
1892                         continue;
1893                 }
1894                 if (status == -EAGAIN) {
1895                         /* We must have found a delegation */
1896                         exception.retry = 1;
1897                         continue;
1898                 }
1899                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1900                                         status, &exception));
1901         } while (exception.retry);
1902         return res;
1903 }
1904
1905 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1906                             struct nfs_fattr *fattr, struct iattr *sattr,
1907                             struct nfs4_state *state)
1908 {
1909         struct nfs_server *server = NFS_SERVER(inode);
1910         struct nfs_setattrargs  arg = {
1911                 .fh             = NFS_FH(inode),
1912                 .iap            = sattr,
1913                 .server         = server,
1914                 .bitmask = server->attr_bitmask,
1915         };
1916         struct nfs_setattrres  res = {
1917                 .fattr          = fattr,
1918                 .server         = server,
1919         };
1920         struct rpc_message msg = {
1921                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1922                 .rpc_argp       = &arg,
1923                 .rpc_resp       = &res,
1924                 .rpc_cred       = cred,
1925         };
1926         unsigned long timestamp = jiffies;
1927         int status;
1928
1929         nfs_fattr_init(fattr);
1930
1931         if (state != NULL) {
1932                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1933                                 current->files, current->tgid);
1934         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1935                                 FMODE_WRITE)) {
1936                 /* Use that stateid */
1937         } else
1938                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1939
1940         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1941         if (status == 0 && state != NULL)
1942                 renew_lease(server, timestamp);
1943         return status;
1944 }
1945
1946 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1947                            struct nfs_fattr *fattr, struct iattr *sattr,
1948                            struct nfs4_state *state)
1949 {
1950         struct nfs_server *server = NFS_SERVER(inode);
1951         struct nfs4_exception exception = {
1952                 .state = state,
1953                 .inode = inode,
1954         };
1955         int err;
1956         do {
1957                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
1958                 switch (err) {
1959                 case -NFS4ERR_OPENMODE:
1960                         if (state && !(state->state & FMODE_WRITE)) {
1961                                 err = -EBADF;
1962                                 if (sattr->ia_valid & ATTR_OPEN)
1963                                         err = -EACCES;
1964                                 goto out;
1965                         }
1966                 }
1967                 err = nfs4_handle_exception(server, err, &exception);
1968         } while (exception.retry);
1969 out:
1970         return err;
1971 }
1972
1973 struct nfs4_closedata {
1974         struct inode *inode;
1975         struct nfs4_state *state;
1976         struct nfs_closeargs arg;
1977         struct nfs_closeres res;
1978         struct nfs_fattr fattr;
1979         unsigned long timestamp;
1980         bool roc;
1981         u32 roc_barrier;
1982 };
1983
1984 static void nfs4_free_closedata(void *data)
1985 {
1986         struct nfs4_closedata *calldata = data;
1987         struct nfs4_state_owner *sp = calldata->state->owner;
1988         struct super_block *sb = calldata->state->inode->i_sb;
1989
1990         if (calldata->roc)
1991                 pnfs_roc_release(calldata->state->inode);
1992         nfs4_put_open_state(calldata->state);
1993         nfs_free_seqid(calldata->arg.seqid);
1994         nfs4_put_state_owner(sp);
1995         nfs_sb_deactive(sb);
1996         kfree(calldata);
1997 }
1998
1999 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2000                 fmode_t fmode)
2001 {
2002         spin_lock(&state->owner->so_lock);
2003         if (!(fmode & FMODE_READ))
2004                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2005         if (!(fmode & FMODE_WRITE))
2006                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2007         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2008         spin_unlock(&state->owner->so_lock);
2009 }
2010
2011 static void nfs4_close_done(struct rpc_task *task, void *data)
2012 {
2013         struct nfs4_closedata *calldata = data;
2014         struct nfs4_state *state = calldata->state;
2015         struct nfs_server *server = NFS_SERVER(calldata->inode);
2016
2017         dprintk("%s: begin!\n", __func__);
2018         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2019                 return;
2020         /* hmm. we are done with the inode, and in the process of freeing
2021          * the state_owner. we keep this around to process errors
2022          */
2023         switch (task->tk_status) {
2024                 case 0:
2025                         if (calldata->roc)
2026                                 pnfs_roc_set_barrier(state->inode,
2027                                                      calldata->roc_barrier);
2028                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2029                         renew_lease(server, calldata->timestamp);
2030                         nfs4_close_clear_stateid_flags(state,
2031                                         calldata->arg.fmode);
2032                         break;
2033                 case -NFS4ERR_STALE_STATEID:
2034                 case -NFS4ERR_OLD_STATEID:
2035                 case -NFS4ERR_BAD_STATEID:
2036                 case -NFS4ERR_EXPIRED:
2037                         if (calldata->arg.fmode == 0)
2038                                 break;
2039                 default:
2040                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2041                                 rpc_restart_call_prepare(task);
2042         }
2043         nfs_release_seqid(calldata->arg.seqid);
2044         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2045         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2046 }
2047
2048 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2049 {
2050         struct nfs4_closedata *calldata = data;
2051         struct nfs4_state *state = calldata->state;
2052         int call_close = 0;
2053
2054         dprintk("%s: begin!\n", __func__);
2055         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2056                 return;
2057
2058         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2059         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2060         spin_lock(&state->owner->so_lock);
2061         /* Calculate the change in open mode */
2062         if (state->n_rdwr == 0) {
2063                 if (state->n_rdonly == 0) {
2064                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2065                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2066                         calldata->arg.fmode &= ~FMODE_READ;
2067                 }
2068                 if (state->n_wronly == 0) {
2069                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2070                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2071                         calldata->arg.fmode &= ~FMODE_WRITE;
2072                 }
2073         }
2074         spin_unlock(&state->owner->so_lock);
2075
2076         if (!call_close) {
2077                 /* Note: exit _without_ calling nfs4_close_done */
2078                 task->tk_action = NULL;
2079                 goto out;
2080         }
2081
2082         if (calldata->arg.fmode == 0) {
2083                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2084                 if (calldata->roc &&
2085                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2086                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2087                                      task, NULL);
2088                         goto out;
2089                 }
2090         }
2091
2092         nfs_fattr_init(calldata->res.fattr);
2093         calldata->timestamp = jiffies;
2094         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2095                                 &calldata->arg.seq_args,
2096                                 &calldata->res.seq_res,
2097                                 task))
2098                 goto out;
2099         rpc_call_start(task);
2100 out:
2101         dprintk("%s: done!\n", __func__);
2102 }
2103
2104 static const struct rpc_call_ops nfs4_close_ops = {
2105         .rpc_call_prepare = nfs4_close_prepare,
2106         .rpc_call_done = nfs4_close_done,
2107         .rpc_release = nfs4_free_closedata,
2108 };
2109
2110 /*
2111  * It is possible for data to be read/written from a mem-mapped file
2112  * after the sys_close call (which hits the vfs layer as a flush).
2113  * This means that we can't safely call nfsv4 close on a file until
2114  * the inode is cleared. This in turn means that we are not good
2115  * NFSv4 citizens - we do not indicate to the server to update the file's
2116  * share state even when we are done with one of the three share
2117  * stateid's in the inode.
2118  *
2119  * NOTE: Caller must be holding the sp->so_owner semaphore!
2120  */
2121 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2122 {
2123         struct nfs_server *server = NFS_SERVER(state->inode);
2124         struct nfs4_closedata *calldata;
2125         struct nfs4_state_owner *sp = state->owner;
2126         struct rpc_task *task;
2127         struct rpc_message msg = {
2128                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2129                 .rpc_cred = state->owner->so_cred,
2130         };
2131         struct rpc_task_setup task_setup_data = {
2132                 .rpc_client = server->client,
2133                 .rpc_message = &msg,
2134                 .callback_ops = &nfs4_close_ops,
2135                 .workqueue = nfsiod_workqueue,
2136                 .flags = RPC_TASK_ASYNC,
2137         };
2138         int status = -ENOMEM;
2139
2140         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2141         if (calldata == NULL)
2142                 goto out;
2143         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2144         calldata->inode = state->inode;
2145         calldata->state = state;
2146         calldata->arg.fh = NFS_FH(state->inode);
2147         calldata->arg.stateid = &state->open_stateid;
2148         /* Serialization for the sequence id */
2149         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2150         if (calldata->arg.seqid == NULL)
2151                 goto out_free_calldata;
2152         calldata->arg.fmode = 0;
2153         calldata->arg.bitmask = server->cache_consistency_bitmask;
2154         calldata->res.fattr = &calldata->fattr;
2155         calldata->res.seqid = calldata->arg.seqid;
2156         calldata->res.server = server;
2157         calldata->roc = roc;
2158         nfs_sb_active(calldata->inode->i_sb);
2159
2160         msg.rpc_argp = &calldata->arg;
2161         msg.rpc_resp = &calldata->res;
2162         task_setup_data.callback_data = calldata;
2163         task = rpc_run_task(&task_setup_data);
2164         if (IS_ERR(task))
2165                 return PTR_ERR(task);
2166         status = 0;
2167         if (wait)
2168                 status = rpc_wait_for_completion_task(task);
2169         rpc_put_task(task);
2170         return status;
2171 out_free_calldata:
2172         kfree(calldata);
2173 out:
2174         if (roc)
2175                 pnfs_roc_release(state->inode);
2176         nfs4_put_open_state(state);
2177         nfs4_put_state_owner(sp);
2178         return status;
2179 }
2180
2181 static struct inode *
2182 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2183 {
2184         struct nfs4_state *state;
2185
2186         /* Protect against concurrent sillydeletes */
2187         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2188         if (IS_ERR(state))
2189                 return ERR_CAST(state);
2190         ctx->state = state;
2191         return igrab(state->inode);
2192 }
2193
2194 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2195 {
2196         if (ctx->state == NULL)
2197                 return;
2198         if (is_sync)
2199                 nfs4_close_sync(ctx->state, ctx->mode);
2200         else
2201                 nfs4_close_state(ctx->state, ctx->mode);
2202 }
2203
2204 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2205 {
2206         struct nfs4_server_caps_arg args = {
2207                 .fhandle = fhandle,
2208         };
2209         struct nfs4_server_caps_res res = {};
2210         struct rpc_message msg = {
2211                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2212                 .rpc_argp = &args,
2213                 .rpc_resp = &res,
2214         };
2215         int status;
2216
2217         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2218         if (status == 0) {
2219                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2220                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2221                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2222                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2223                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2224                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2225                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2226                         server->caps |= NFS_CAP_ACLS;
2227                 if (res.has_links != 0)
2228                         server->caps |= NFS_CAP_HARDLINKS;
2229                 if (res.has_symlinks != 0)
2230                         server->caps |= NFS_CAP_SYMLINKS;
2231                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2232                         server->caps |= NFS_CAP_FILEID;
2233                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2234                         server->caps |= NFS_CAP_MODE;
2235                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2236                         server->caps |= NFS_CAP_NLINK;
2237                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2238                         server->caps |= NFS_CAP_OWNER;
2239                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2240                         server->caps |= NFS_CAP_OWNER_GROUP;
2241                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2242                         server->caps |= NFS_CAP_ATIME;
2243                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2244                         server->caps |= NFS_CAP_CTIME;
2245                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2246                         server->caps |= NFS_CAP_MTIME;
2247
2248                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2249                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2250                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2251                 server->acl_bitmask = res.acl_bitmask;
2252                 server->fh_expire_type = res.fh_expire_type;
2253         }
2254
2255         return status;
2256 }
2257
2258 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2259 {
2260         struct nfs4_exception exception = { };
2261         int err;
2262         do {
2263                 err = nfs4_handle_exception(server,
2264                                 _nfs4_server_capabilities(server, fhandle),
2265                                 &exception);
2266         } while (exception.retry);
2267         return err;
2268 }
2269
2270 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2271                 struct nfs_fsinfo *info)
2272 {
2273         struct nfs4_lookup_root_arg args = {
2274                 .bitmask = nfs4_fattr_bitmap,
2275         };
2276         struct nfs4_lookup_res res = {
2277                 .server = server,
2278                 .fattr = info->fattr,
2279                 .fh = fhandle,
2280         };
2281         struct rpc_message msg = {
2282                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2283                 .rpc_argp = &args,
2284                 .rpc_resp = &res,
2285         };
2286
2287         nfs_fattr_init(info->fattr);
2288         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2289 }
2290
2291 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2292                 struct nfs_fsinfo *info)
2293 {
2294         struct nfs4_exception exception = { };
2295         int err;
2296         do {
2297                 err = _nfs4_lookup_root(server, fhandle, info);
2298                 switch (err) {
2299                 case 0:
2300                 case -NFS4ERR_WRONGSEC:
2301                         goto out;
2302                 default:
2303                         err = nfs4_handle_exception(server, err, &exception);
2304                 }
2305         } while (exception.retry);
2306 out:
2307         return err;
2308 }
2309
2310 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2311                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2312 {
2313         struct rpc_auth *auth;
2314         int ret;
2315
2316         auth = rpcauth_create(flavor, server->client);
2317         if (!auth) {
2318                 ret = -EIO;
2319                 goto out;
2320         }
2321         ret = nfs4_lookup_root(server, fhandle, info);
2322 out:
2323         return ret;
2324 }
2325
2326 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2327                               struct nfs_fsinfo *info)
2328 {
2329         int i, len, status = 0;
2330         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2331
2332         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2333         flav_array[len] = RPC_AUTH_NULL;
2334         len += 1;
2335
2336         for (i = 0; i < len; i++) {
2337                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2338                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2339                         continue;
2340                 break;
2341         }
2342         /*
2343          * -EACCESS could mean that the user doesn't have correct permissions
2344          * to access the mount.  It could also mean that we tried to mount
2345          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2346          * existing mount programs don't handle -EACCES very well so it should
2347          * be mapped to -EPERM instead.
2348          */
2349         if (status == -EACCES)
2350                 status = -EPERM;
2351         return status;
2352 }
2353
2354 /*
2355  * get the file handle for the "/" directory on the server
2356  */
2357 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2358                               struct nfs_fsinfo *info)
2359 {
2360         int minor_version = server->nfs_client->cl_minorversion;
2361         int status = nfs4_lookup_root(server, fhandle, info);
2362         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2363                 /*
2364                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2365                  * by nfs4_map_errors() as this function exits.
2366                  */
2367                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2368         if (status == 0)
2369                 status = nfs4_server_capabilities(server, fhandle);
2370         if (status == 0)
2371                 status = nfs4_do_fsinfo(server, fhandle, info);
2372         return nfs4_map_errors(status);
2373 }
2374
2375 /*
2376  * Get locations and (maybe) other attributes of a referral.
2377  * Note that we'll actually follow the referral later when
2378  * we detect fsid mismatch in inode revalidation
2379  */
2380 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2381                              const struct qstr *name, struct nfs_fattr *fattr,
2382                              struct nfs_fh *fhandle)
2383 {
2384         int status = -ENOMEM;
2385         struct page *page = NULL;
2386         struct nfs4_fs_locations *locations = NULL;
2387
2388         page = alloc_page(GFP_KERNEL);
2389         if (page == NULL)
2390                 goto out;
2391         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2392         if (locations == NULL)
2393                 goto out;
2394
2395         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2396         if (status != 0)
2397                 goto out;
2398         /* Make sure server returned a different fsid for the referral */
2399         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2400                 dprintk("%s: server did not return a different fsid for"
2401                         " a referral at %s\n", __func__, name->name);
2402                 status = -EIO;
2403                 goto out;
2404         }
2405         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2406         nfs_fixup_referral_attributes(&locations->fattr);
2407
2408         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2409         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2410         memset(fhandle, 0, sizeof(struct nfs_fh));
2411 out:
2412         if (page)
2413                 __free_page(page);
2414         kfree(locations);
2415         return status;
2416 }
2417
2418 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2419 {
2420         struct nfs4_getattr_arg args = {
2421                 .fh = fhandle,
2422                 .bitmask = server->attr_bitmask,
2423         };
2424         struct nfs4_getattr_res res = {
2425                 .fattr = fattr,
2426                 .server = server,
2427         };
2428         struct rpc_message msg = {
2429                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2430                 .rpc_argp = &args,
2431                 .rpc_resp = &res,
2432         };
2433
2434         nfs_fattr_init(fattr);
2435         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2436 }
2437
2438 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2439 {
2440         struct nfs4_exception exception = { };
2441         int err;
2442         do {
2443                 err = nfs4_handle_exception(server,
2444                                 _nfs4_proc_getattr(server, fhandle, fattr),
2445                                 &exception);
2446         } while (exception.retry);
2447         return err;
2448 }
2449
2450 /*
2451  * The file is not closed if it is opened due to the a request to change
2452  * the size of the file. The open call will not be needed once the
2453  * VFS layer lookup-intents are implemented.
2454  *
2455  * Close is called when the inode is destroyed.
2456  * If we haven't opened the file for O_WRONLY, we
2457  * need to in the size_change case to obtain a stateid.
2458  *
2459  * Got race?
2460  * Because OPEN is always done by name in nfsv4, it is
2461  * possible that we opened a different file by the same
2462  * name.  We can recognize this race condition, but we
2463  * can't do anything about it besides returning an error.
2464  *
2465  * This will be fixed with VFS changes (lookup-intent).
2466  */
2467 static int
2468 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2469                   struct iattr *sattr)
2470 {
2471         struct inode *inode = dentry->d_inode;
2472         struct rpc_cred *cred = NULL;
2473         struct nfs4_state *state = NULL;
2474         int status;
2475
2476         if (pnfs_ld_layoutret_on_setattr(inode))
2477                 pnfs_return_layout(inode);
2478
2479         nfs_fattr_init(fattr);
2480
2481         /* Search for an existing open(O_WRITE) file */
2482         if (sattr->ia_valid & ATTR_FILE) {
2483                 struct nfs_open_context *ctx;
2484
2485                 ctx = nfs_file_open_context(sattr->ia_file);
2486                 if (ctx) {
2487                         cred = ctx->cred;
2488                         state = ctx->state;
2489                 }
2490         }
2491
2492         /* Deal with open(O_TRUNC) */
2493         if (sattr->ia_valid & ATTR_OPEN)
2494                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2495
2496         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2497         if (status == 0)
2498                 nfs_setattr_update_inode(inode, sattr);
2499         return status;
2500 }
2501
2502 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2503                 const struct qstr *name, struct nfs_fh *fhandle,
2504                 struct nfs_fattr *fattr)
2505 {
2506         struct nfs_server *server = NFS_SERVER(dir);
2507         int                    status;
2508         struct nfs4_lookup_arg args = {
2509                 .bitmask = server->attr_bitmask,
2510                 .dir_fh = NFS_FH(dir),
2511                 .name = name,
2512         };
2513         struct nfs4_lookup_res res = {
2514                 .server = server,
2515                 .fattr = fattr,
2516                 .fh = fhandle,
2517         };
2518         struct rpc_message msg = {
2519                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2520                 .rpc_argp = &args,
2521                 .rpc_resp = &res,
2522         };
2523
2524         nfs_fattr_init(fattr);
2525
2526         dprintk("NFS call  lookup %s\n", name->name);
2527         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2528         dprintk("NFS reply lookup: %d\n", status);
2529         return status;
2530 }
2531
2532 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2533 {
2534         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2535                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2536         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2537         fattr->nlink = 2;
2538 }
2539
2540 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2541                                    struct qstr *name, struct nfs_fh *fhandle,
2542                                    struct nfs_fattr *fattr)
2543 {
2544         struct nfs4_exception exception = { };
2545         struct rpc_clnt *client = *clnt;
2546         int err;
2547         do {
2548                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2549                 switch (err) {
2550                 case -NFS4ERR_BADNAME:
2551                         err = -ENOENT;
2552                         goto out;
2553                 case -NFS4ERR_MOVED:
2554                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2555                         goto out;
2556                 case -NFS4ERR_WRONGSEC:
2557                         err = -EPERM;
2558                         if (client != *clnt)
2559                                 goto out;
2560
2561                         client = nfs4_create_sec_client(client, dir, name);
2562                         if (IS_ERR(client))
2563                                 return PTR_ERR(client);
2564
2565                         exception.retry = 1;
2566                         break;
2567                 default:
2568                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2569                 }
2570         } while (exception.retry);
2571
2572 out:
2573         if (err == 0)
2574                 *clnt = client;
2575         else if (client != *clnt)
2576                 rpc_shutdown_client(client);
2577
2578         return err;
2579 }
2580
2581 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2582                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2583 {
2584         int status;
2585         struct rpc_clnt *client = NFS_CLIENT(dir);
2586
2587         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2588         if (client != NFS_CLIENT(dir)) {
2589                 rpc_shutdown_client(client);
2590                 nfs_fixup_secinfo_attributes(fattr);
2591         }
2592         return status;
2593 }
2594
2595 struct rpc_clnt *
2596 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2597                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2598 {
2599         int status;
2600         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2601
2602         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2603         if (status < 0) {
2604                 rpc_shutdown_client(client);
2605                 return ERR_PTR(status);
2606         }
2607         return client;
2608 }
2609
2610 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2611 {
2612         struct nfs_server *server = NFS_SERVER(inode);
2613         struct nfs4_accessargs args = {
2614                 .fh = NFS_FH(inode),
2615                 .bitmask = server->cache_consistency_bitmask,
2616         };
2617         struct nfs4_accessres res = {
2618                 .server = server,
2619         };
2620         struct rpc_message msg = {
2621                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2622                 .rpc_argp = &args,
2623                 .rpc_resp = &res,
2624                 .rpc_cred = entry->cred,
2625         };
2626         int mode = entry->mask;
2627         int status;
2628
2629         /*
2630          * Determine which access bits we want to ask for...
2631          */
2632         if (mode & MAY_READ)
2633                 args.access |= NFS4_ACCESS_READ;
2634         if (S_ISDIR(inode->i_mode)) {
2635                 if (mode & MAY_WRITE)
2636                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2637                 if (mode & MAY_EXEC)
2638                         args.access |= NFS4_ACCESS_LOOKUP;
2639         } else {
2640                 if (mode & MAY_WRITE)
2641                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2642                 if (mode & MAY_EXEC)
2643                         args.access |= NFS4_ACCESS_EXECUTE;
2644         }
2645
2646         res.fattr = nfs_alloc_fattr();
2647         if (res.fattr == NULL)
2648                 return -ENOMEM;
2649
2650         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2651         if (!status) {
2652                 entry->mask = 0;
2653                 if (res.access & NFS4_ACCESS_READ)
2654                         entry->mask |= MAY_READ;
2655                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2656                         entry->mask |= MAY_WRITE;
2657                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2658                         entry->mask |= MAY_EXEC;
2659                 nfs_refresh_inode(inode, res.fattr);
2660         }
2661         nfs_free_fattr(res.fattr);
2662         return status;
2663 }
2664
2665 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2666 {
2667         struct nfs4_exception exception = { };
2668         int err;
2669         do {
2670                 err = nfs4_handle_exception(NFS_SERVER(inode),
2671                                 _nfs4_proc_access(inode, entry),
2672                                 &exception);
2673         } while (exception.retry);
2674         return err;
2675 }
2676
2677 /*
2678  * TODO: For the time being, we don't try to get any attributes
2679  * along with any of the zero-copy operations READ, READDIR,
2680  * READLINK, WRITE.
2681  *
2682  * In the case of the first three, we want to put the GETATTR
2683  * after the read-type operation -- this is because it is hard
2684  * to predict the length of a GETATTR response in v4, and thus
2685  * align the READ data correctly.  This means that the GETATTR
2686  * may end up partially falling into the page cache, and we should
2687  * shift it into the 'tail' of the xdr_buf before processing.
2688  * To do this efficiently, we need to know the total length
2689  * of data received, which doesn't seem to be available outside
2690  * of the RPC layer.
2691  *
2692  * In the case of WRITE, we also want to put the GETATTR after
2693  * the operation -- in this case because we want to make sure
2694  * we get the post-operation mtime and size.  This means that
2695  * we can't use xdr_encode_pages() as written: we need a variant
2696  * of it which would leave room in the 'tail' iovec.
2697  *
2698  * Both of these changes to the XDR layer would in fact be quite
2699  * minor, but I decided to leave them for a subsequent patch.
2700  */
2701 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2702                 unsigned int pgbase, unsigned int pglen)
2703 {
2704         struct nfs4_readlink args = {
2705                 .fh       = NFS_FH(inode),
2706                 .pgbase   = pgbase,
2707                 .pglen    = pglen,
2708                 .pages    = &page,
2709         };
2710         struct nfs4_readlink_res res;
2711         struct rpc_message msg = {
2712                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2713                 .rpc_argp = &args,
2714                 .rpc_resp = &res,
2715         };
2716
2717         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2718 }
2719
2720 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2721                 unsigned int pgbase, unsigned int pglen)
2722 {
2723         struct nfs4_exception exception = { };
2724         int err;
2725         do {
2726                 err = nfs4_handle_exception(NFS_SERVER(inode),
2727                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2728                                 &exception);
2729         } while (exception.retry);
2730         return err;
2731 }
2732
2733 /*
2734  * Got race?
2735  * We will need to arrange for the VFS layer to provide an atomic open.
2736  * Until then, this create/open method is prone to inefficiency and race
2737  * conditions due to the lookup, create, and open VFS calls from sys_open()
2738  * placed on the wire.
2739  *
2740  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2741  * The file will be opened again in the subsequent VFS open call
2742  * (nfs4_proc_file_open).
2743  *
2744  * The open for read will just hang around to be used by any process that
2745  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2746  */
2747
2748 static int
2749 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2750                  int flags, struct nfs_open_context *ctx)
2751 {
2752         struct dentry *de = dentry;
2753         struct nfs4_state *state;
2754         struct rpc_cred *cred = NULL;
2755         fmode_t fmode = 0;
2756         int status = 0;
2757
2758         if (ctx != NULL) {
2759                 cred = ctx->cred;
2760                 de = ctx->dentry;
2761                 fmode = ctx->mode;
2762         }
2763         sattr->ia_mode &= ~current_umask();
2764         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2765         d_drop(dentry);
2766         if (IS_ERR(state)) {
2767                 status = PTR_ERR(state);
2768                 goto out;
2769         }
2770         d_add(dentry, igrab(state->inode));
2771         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2772         if (ctx != NULL)
2773                 ctx->state = state;
2774         else
2775                 nfs4_close_sync(state, fmode);
2776 out:
2777         return status;
2778 }
2779
2780 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2781 {
2782         struct nfs_server *server = NFS_SERVER(dir);
2783         struct nfs_removeargs args = {
2784                 .fh = NFS_FH(dir),
2785                 .name = *name,
2786                 .bitmask = server->attr_bitmask,
2787         };
2788         struct nfs_removeres res = {
2789                 .server = server,
2790         };
2791         struct rpc_message msg = {
2792                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2793                 .rpc_argp = &args,
2794                 .rpc_resp = &res,
2795         };
2796         int status = -ENOMEM;
2797
2798         res.dir_attr = nfs_alloc_fattr();
2799         if (res.dir_attr == NULL)
2800                 goto out;
2801
2802         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2803         if (status == 0) {
2804                 update_changeattr(dir, &res.cinfo);
2805                 nfs_post_op_update_inode(dir, res.dir_attr);
2806         }
2807         nfs_free_fattr(res.dir_attr);
2808 out:
2809         return status;
2810 }
2811
2812 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2813 {
2814         struct nfs4_exception exception = { };
2815         int err;
2816         do {
2817                 err = nfs4_handle_exception(NFS_SERVER(dir),
2818                                 _nfs4_proc_remove(dir, name),
2819                                 &exception);
2820         } while (exception.retry);
2821         return err;
2822 }
2823
2824 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2825 {
2826         struct nfs_server *server = NFS_SERVER(dir);
2827         struct nfs_removeargs *args = msg->rpc_argp;
2828         struct nfs_removeres *res = msg->rpc_resp;
2829
2830         args->bitmask = server->cache_consistency_bitmask;
2831         res->server = server;
2832         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2833         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2834 }
2835
2836 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2837 {
2838         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2839                                 &data->args.seq_args,
2840                                 &data->res.seq_res,
2841                                 task))
2842                 return;
2843         rpc_call_start(task);
2844 }
2845
2846 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2847 {
2848         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2849
2850         if (!nfs4_sequence_done(task, &res->seq_res))
2851                 return 0;
2852         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2853                 return 0;
2854         update_changeattr(dir, &res->cinfo);
2855         nfs_post_op_update_inode(dir, res->dir_attr);
2856         return 1;
2857 }
2858
2859 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2860 {
2861         struct nfs_server *server = NFS_SERVER(dir);
2862         struct nfs_renameargs *arg = msg->rpc_argp;
2863         struct nfs_renameres *res = msg->rpc_resp;
2864
2865         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2866         arg->bitmask = server->attr_bitmask;
2867         res->server = server;
2868         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2869 }
2870
2871 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2872 {
2873         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2874                                 &data->args.seq_args,
2875                                 &data->res.seq_res,
2876                                 task))
2877                 return;
2878         rpc_call_start(task);
2879 }
2880
2881 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2882                                  struct inode *new_dir)
2883 {
2884         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2885
2886         if (!nfs4_sequence_done(task, &res->seq_res))
2887                 return 0;
2888         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2889                 return 0;
2890
2891         update_changeattr(old_dir, &res->old_cinfo);
2892         nfs_post_op_update_inode(old_dir, res->old_fattr);
2893         update_changeattr(new_dir, &res->new_cinfo);
2894         nfs_post_op_update_inode(new_dir, res->new_fattr);
2895         return 1;
2896 }
2897
2898 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2899                 struct inode *new_dir, struct qstr *new_name)
2900 {
2901         struct nfs_server *server = NFS_SERVER(old_dir);
2902         struct nfs_renameargs arg = {
2903                 .old_dir = NFS_FH(old_dir),
2904                 .new_dir = NFS_FH(new_dir),
2905                 .old_name = old_name,
2906                 .new_name = new_name,
2907                 .bitmask = server->attr_bitmask,
2908         };
2909         struct nfs_renameres res = {
2910                 .server = server,
2911         };
2912         struct rpc_message msg = {
2913                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2914                 .rpc_argp = &arg,
2915                 .rpc_resp = &res,
2916         };
2917         int status = -ENOMEM;
2918
2919         res.old_fattr = nfs_alloc_fattr();
2920         res.new_fattr = nfs_alloc_fattr();
2921         if (res.old_fattr == NULL || res.new_fattr == NULL)
2922                 goto out;
2923
2924         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2925         if (!status) {
2926                 update_changeattr(old_dir, &res.old_cinfo);
2927                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2928                 update_changeattr(new_dir, &res.new_cinfo);
2929                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2930         }
2931 out:
2932         nfs_free_fattr(res.new_fattr);
2933         nfs_free_fattr(res.old_fattr);
2934         return status;
2935 }
2936
2937 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2938                 struct inode *new_dir, struct qstr *new_name)
2939 {
2940         struct nfs4_exception exception = { };
2941         int err;
2942         do {
2943                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2944                                 _nfs4_proc_rename(old_dir, old_name,
2945                                         new_dir, new_name),
2946                                 &exception);
2947         } while (exception.retry);
2948         return err;
2949 }
2950
2951 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2952 {
2953         struct nfs_server *server = NFS_SERVER(inode);
2954         struct nfs4_link_arg arg = {
2955                 .fh     = NFS_FH(inode),
2956                 .dir_fh = NFS_FH(dir),
2957                 .name   = name,
2958                 .bitmask = server->attr_bitmask,
2959         };
2960         struct nfs4_link_res res = {
2961                 .server = server,
2962         };
2963         struct rpc_message msg = {
2964                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2965                 .rpc_argp = &arg,
2966                 .rpc_resp = &res,
2967         };
2968         int status = -ENOMEM;
2969
2970         res.fattr = nfs_alloc_fattr();
2971         res.dir_attr = nfs_alloc_fattr();
2972         if (res.fattr == NULL || res.dir_attr == NULL)
2973                 goto out;
2974
2975         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2976         if (!status) {
2977                 update_changeattr(dir, &res.cinfo);
2978                 nfs_post_op_update_inode(dir, res.dir_attr);
2979                 nfs_post_op_update_inode(inode, res.fattr);
2980         }
2981 out:
2982         nfs_free_fattr(res.dir_attr);
2983         nfs_free_fattr(res.fattr);
2984         return status;
2985 }
2986
2987 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2988 {
2989         struct nfs4_exception exception = { };
2990         int err;
2991         do {
2992                 err = nfs4_handle_exception(NFS_SERVER(inode),
2993                                 _nfs4_proc_link(inode, dir, name),
2994                                 &exception);
2995         } while (exception.retry);
2996         return err;
2997 }
2998
2999 struct nfs4_createdata {
3000         struct rpc_message msg;
3001         struct nfs4_create_arg arg;
3002         struct nfs4_create_res res;
3003         struct nfs_fh fh;
3004         struct nfs_fattr fattr;
3005         struct nfs_fattr dir_fattr;
3006 };
3007
3008 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3009                 struct qstr *name, struct iattr *sattr, u32 ftype)
3010 {
3011         struct nfs4_createdata *data;
3012
3013         data = kzalloc(sizeof(*data), GFP_KERNEL);
3014         if (data != NULL) {
3015                 struct nfs_server *server = NFS_SERVER(dir);
3016
3017                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3018                 data->msg.rpc_argp = &data->arg;
3019                 data->msg.rpc_resp = &data->res;
3020                 data->arg.dir_fh = NFS_FH(dir);
3021                 data->arg.server = server;
3022                 data->arg.name = name;
3023                 data->arg.attrs = sattr;
3024                 data->arg.ftype = ftype;
3025                 data->arg.bitmask = server->attr_bitmask;
3026                 data->res.server = server;
3027                 data->res.fh = &data->fh;
3028                 data->res.fattr = &data->fattr;
3029                 data->res.dir_fattr = &data->dir_fattr;
3030                 nfs_fattr_init(data->res.fattr);
3031                 nfs_fattr_init(data->res.dir_fattr);
3032         }
3033         return data;
3034 }
3035
3036 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3037 {
3038         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3039                                     &data->arg.seq_args, &data->res.seq_res, 1);
3040         if (status == 0) {
3041                 update_changeattr(dir, &data->res.dir_cinfo);
3042                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
3043                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3044         }
3045         return status;
3046 }
3047
3048 static void nfs4_free_createdata(struct nfs4_createdata *data)
3049 {
3050         kfree(data);
3051 }
3052
3053 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3054                 struct page *page, unsigned int len, struct iattr *sattr)
3055 {
3056         struct nfs4_createdata *data;
3057         int status = -ENAMETOOLONG;
3058
3059         if (len > NFS4_MAXPATHLEN)
3060                 goto out;
3061
3062         status = -ENOMEM;
3063         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3064         if (data == NULL)
3065                 goto out;
3066
3067         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3068         data->arg.u.symlink.pages = &page;
3069         data->arg.u.symlink.len = len;
3070
3071         status = nfs4_do_create(dir, dentry, data);
3072
3073         nfs4_free_createdata(data);
3074 out:
3075         return status;
3076 }
3077
3078 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3079                 struct page *page, unsigned int len, struct iattr *sattr)
3080 {
3081         struct nfs4_exception exception = { };
3082         int err;
3083         do {
3084                 err = nfs4_handle_exception(NFS_SERVER(dir),
3085                                 _nfs4_proc_symlink(dir, dentry, page,
3086                                                         len, sattr),
3087                                 &exception);
3088         } while (exception.retry);
3089         return err;
3090 }
3091
3092 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3093                 struct iattr *sattr)
3094 {
3095         struct nfs4_createdata *data;
3096         int status = -ENOMEM;
3097
3098         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3099         if (data == NULL)
3100                 goto out;
3101
3102         status = nfs4_do_create(dir, dentry, data);
3103
3104         nfs4_free_createdata(data);
3105 out:
3106         return status;
3107 }
3108
3109 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3110                 struct iattr *sattr)
3111 {
3112         struct nfs4_exception exception = { };
3113         int err;
3114
3115         sattr->ia_mode &= ~current_umask();
3116         do {
3117                 err = nfs4_handle_exception(NFS_SERVER(dir),
3118                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3119                                 &exception);
3120         } while (exception.retry);
3121         return err;
3122 }
3123
3124 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3125                 u64 cookie, struct page **pages, unsigned int count, int plus)
3126 {
3127         struct inode            *dir = dentry->d_inode;
3128         struct nfs4_readdir_arg args = {
3129                 .fh = NFS_FH(dir),
3130                 .pages = pages,
3131                 .pgbase = 0,
3132                 .count = count,
3133                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3134                 .plus = plus,
3135         };
3136         struct nfs4_readdir_res res;
3137         struct rpc_message msg = {
3138                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3139                 .rpc_argp = &args,
3140                 .rpc_resp = &res,
3141                 .rpc_cred = cred,
3142         };
3143         int                     status;
3144
3145         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3146                         dentry->d_parent->d_name.name,
3147                         dentry->d_name.name,
3148                         (unsigned long long)cookie);
3149         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3150         res.pgbase = args.pgbase;
3151         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3152         if (status >= 0) {
3153                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3154                 status += args.pgbase;
3155         }
3156
3157         nfs_invalidate_atime(dir);
3158
3159         dprintk("%s: returns %d\n", __func__, status);
3160         return status;
3161 }
3162
3163 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3164                 u64 cookie, struct page **pages, unsigned int count, int plus)
3165 {
3166         struct nfs4_exception exception = { };
3167         int err;
3168         do {
3169                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3170                                 _nfs4_proc_readdir(dentry, cred, cookie,
3171                                         pages, count, plus),
3172                                 &exception);
3173         } while (exception.retry);
3174         return err;
3175 }
3176
3177 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3178                 struct iattr *sattr, dev_t rdev)
3179 {
3180         struct nfs4_createdata *data;
3181         int mode = sattr->ia_mode;
3182         int status = -ENOMEM;
3183
3184         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3185         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3186
3187         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3188         if (data == NULL)
3189                 goto out;
3190
3191         if (S_ISFIFO(mode))
3192                 data->arg.ftype = NF4FIFO;
3193         else if (S_ISBLK(mode)) {
3194                 data->arg.ftype = NF4BLK;
3195                 data->arg.u.device.specdata1 = MAJOR(rdev);
3196                 data->arg.u.device.specdata2 = MINOR(rdev);
3197         }
3198         else if (S_ISCHR(mode)) {
3199                 data->arg.ftype = NF4CHR;
3200                 data->arg.u.device.specdata1 = MAJOR(rdev);
3201                 data->arg.u.device.specdata2 = MINOR(rdev);
3202         }
3203
3204         status = nfs4_do_create(dir, dentry, data);
3205
3206         nfs4_free_createdata(data);
3207 out:
3208         return status;
3209 }
3210
3211 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3212                 struct iattr *sattr, dev_t rdev)
3213 {
3214         struct nfs4_exception exception = { };
3215         int err;
3216
3217         sattr->ia_mode &= ~current_umask();
3218         do {
3219                 err = nfs4_handle_exception(NFS_SERVER(dir),
3220                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3221                                 &exception);
3222         } while (exception.retry);
3223         return err;
3224 }
3225
3226 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3227                  struct nfs_fsstat *fsstat)
3228 {
3229         struct nfs4_statfs_arg args = {
3230                 .fh = fhandle,
3231                 .bitmask = server->attr_bitmask,
3232         };
3233         struct nfs4_statfs_res res = {
3234                 .fsstat = fsstat,
3235         };
3236         struct rpc_message msg = {
3237                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3238                 .rpc_argp = &args,
3239                 .rpc_resp = &res,
3240         };
3241
3242         nfs_fattr_init(fsstat->fattr);
3243         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3244 }
3245
3246 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3247 {
3248         struct nfs4_exception exception = { };
3249         int err;
3250         do {
3251                 err = nfs4_handle_exception(server,
3252                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3253                                 &exception);
3254         } while (exception.retry);
3255         return err;
3256 }
3257
3258 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3259                 struct nfs_fsinfo *fsinfo)
3260 {
3261         struct nfs4_fsinfo_arg args = {
3262                 .fh = fhandle,
3263                 .bitmask = server->attr_bitmask,
3264         };
3265         struct nfs4_fsinfo_res res = {
3266                 .fsinfo = fsinfo,
3267         };
3268         struct rpc_message msg = {
3269                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3270                 .rpc_argp = &args,
3271                 .rpc_resp = &res,
3272         };
3273
3274         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3275 }
3276
3277 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3278 {
3279         struct nfs4_exception exception = { };
3280         int err;
3281
3282         do {
3283                 err = nfs4_handle_exception(server,
3284                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3285                                 &exception);
3286         } while (exception.retry);
3287         return err;
3288 }
3289
3290 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3291 {
3292         nfs_fattr_init(fsinfo->fattr);
3293         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3294 }
3295
3296 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3297                 struct nfs_pathconf *pathconf)
3298 {
3299         struct nfs4_pathconf_arg args = {
3300                 .fh = fhandle,
3301                 .bitmask = server->attr_bitmask,
3302         };
3303         struct nfs4_pathconf_res res = {
3304                 .pathconf = pathconf,
3305         };
3306         struct rpc_message msg = {
3307                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3308                 .rpc_argp = &args,
3309                 .rpc_resp = &res,
3310         };
3311
3312         /* None of the pathconf attributes are mandatory to implement */
3313         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3314                 memset(pathconf, 0, sizeof(*pathconf));
3315                 return 0;
3316         }
3317
3318         nfs_fattr_init(pathconf->fattr);
3319         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3320 }
3321
3322 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3323                 struct nfs_pathconf *pathconf)
3324 {
3325         struct nfs4_exception exception = { };
3326         int err;
3327
3328         do {
3329                 err = nfs4_handle_exception(server,
3330                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3331                                 &exception);
3332         } while (exception.retry);
3333         return err;
3334 }
3335
3336 void __nfs4_read_done_cb(struct nfs_read_data *data)
3337 {
3338         nfs_invalidate_atime(data->inode);
3339 }
3340
3341 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3342 {
3343         struct nfs_server *server = NFS_SERVER(data->inode);
3344
3345         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3346                 rpc_restart_call_prepare(task);
3347                 return -EAGAIN;
3348         }
3349
3350         __nfs4_read_done_cb(data);
3351         if (task->tk_status > 0)
3352                 renew_lease(server, data->timestamp);
3353         return 0;
3354 }
3355
3356 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3357 {
3358
3359         dprintk("--> %s\n", __func__);
3360
3361         if (!nfs4_sequence_done(task, &data->res.seq_res))
3362                 return -EAGAIN;
3363
3364         return data->read_done_cb ? data->read_done_cb(task, data) :
3365                                     nfs4_read_done_cb(task, data);
3366 }
3367
3368 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3369 {
3370         data->timestamp   = jiffies;
3371         data->read_done_cb = nfs4_read_done_cb;
3372         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3373         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3374 }
3375
3376 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3377 {
3378         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3379                                 &data->args.seq_args,
3380                                 &data->res.seq_res,
3381                                 task))
3382                 return;
3383         rpc_call_start(task);
3384 }
3385
3386 /* Reset the the nfs_read_data to send the read to the MDS. */
3387 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3388 {
3389         dprintk("%s Reset task for i/o through\n", __func__);
3390         put_lseg(data->lseg);
3391         data->lseg = NULL;
3392         /* offsets will differ in the dense stripe case */
3393         data->args.offset = data->mds_offset;
3394         data->ds_clp = NULL;
3395         data->args.fh     = NFS_FH(data->inode);
3396         data->read_done_cb = nfs4_read_done_cb;
3397         task->tk_ops = data->mds_ops;
3398         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3399 }
3400 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3401
3402 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3403 {
3404         struct inode *inode = data->inode;
3405
3406         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3407                 rpc_restart_call_prepare(task);
3408                 return -EAGAIN;
3409         }
3410         if (task->tk_status >= 0) {
3411                 renew_lease(NFS_SERVER(inode), data->timestamp);
3412                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3413         }
3414         return 0;
3415 }
3416
3417 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3418 {
3419         if (!nfs4_sequence_done(task, &data->res.seq_res))
3420                 return -EAGAIN;
3421         return data->write_done_cb ? data->write_done_cb(task, data) :
3422                 nfs4_write_done_cb(task, data);
3423 }
3424
3425 /* Reset the the nfs_write_data to send the write to the MDS. */
3426 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3427 {
3428         dprintk("%s Reset task for i/o through\n", __func__);
3429         put_lseg(data->lseg);
3430         data->lseg          = NULL;
3431         data->ds_clp        = NULL;
3432         data->write_done_cb = nfs4_write_done_cb;
3433         data->args.fh       = NFS_FH(data->inode);
3434         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3435         data->args.offset   = data->mds_offset;
3436         data->res.fattr     = &data->fattr;
3437         task->tk_ops        = data->mds_ops;
3438         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3439 }
3440 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3441
3442 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3443 {
3444         struct nfs_server *server = NFS_SERVER(data->inode);
3445
3446         if (data->lseg) {
3447                 data->args.bitmask = NULL;
3448                 data->res.fattr = NULL;
3449         } else
3450                 data->args.bitmask = server->cache_consistency_bitmask;
3451         if (!data->write_done_cb)
3452                 data->write_done_cb = nfs4_write_done_cb;
3453         data->res.server = server;
3454         data->timestamp   = jiffies;
3455
3456         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3457         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3458 }
3459
3460 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3461 {
3462         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3463                                 &data->args.seq_args,
3464                                 &data->res.seq_res,
3465                                 task))
3466                 return;
3467         rpc_call_start(task);
3468 }
3469
3470 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3471 {
3472         struct inode *inode = data->inode;
3473
3474         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3475                 rpc_restart_call_prepare(task);
3476                 return -EAGAIN;
3477         }
3478         nfs_refresh_inode(inode, data->res.fattr);
3479         return 0;
3480 }
3481
3482 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3483 {
3484         if (!nfs4_sequence_done(task, &data->res.seq_res))
3485                 return -EAGAIN;
3486         return data->write_done_cb(task, data);
3487 }
3488
3489 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3490 {
3491         struct nfs_server *server = NFS_SERVER(data->inode);
3492
3493         if (data->lseg) {
3494                 data->args.bitmask = NULL;
3495                 data->res.fattr = NULL;
3496         } else
3497                 data->args.bitmask = server->cache_consistency_bitmask;
3498         if (!data->write_done_cb)
3499                 data->write_done_cb = nfs4_commit_done_cb;
3500         data->res.server = server;
3501         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3502         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3503 }
3504
3505 struct nfs4_renewdata {
3506         struct nfs_client       *client;
3507         unsigned long           timestamp;
3508 };
3509
3510 /*
3511  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3512  * standalone procedure for queueing an asynchronous RENEW.
3513  */
3514 static void nfs4_renew_release(void *calldata)
3515 {
3516         struct nfs4_renewdata *data = calldata;
3517         struct nfs_client *clp = data->client;
3518
3519         if (atomic_read(&clp->cl_count) > 1)
3520                 nfs4_schedule_state_renewal(clp);
3521         nfs_put_client(clp);
3522         kfree(data);
3523 }
3524
3525 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3526 {
3527         struct nfs4_renewdata *data = calldata;
3528         struct nfs_client *clp = data->client;
3529         unsigned long timestamp = data->timestamp;
3530
3531         if (task->tk_status < 0) {
3532                 /* Unless we're shutting down, schedule state recovery! */
3533                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3534                         return;
3535                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3536                         nfs4_schedule_lease_recovery(clp);
3537                         return;
3538                 }
3539                 nfs4_schedule_path_down_recovery(clp);
3540         }
3541         do_renew_lease(clp, timestamp);
3542 }
3543
3544 static const struct rpc_call_ops nfs4_renew_ops = {
3545         .rpc_call_done = nfs4_renew_done,
3546         .rpc_release = nfs4_renew_release,
3547 };
3548
3549 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3550 {
3551         struct rpc_message msg = {
3552                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3553                 .rpc_argp       = clp,
3554                 .rpc_cred       = cred,
3555         };
3556         struct nfs4_renewdata *data;
3557
3558         if (renew_flags == 0)
3559                 return 0;
3560         if (!atomic_inc_not_zero(&clp->cl_count))
3561                 return -EIO;
3562         data = kmalloc(sizeof(*data), GFP_NOFS);
3563         if (data == NULL)
3564                 return -ENOMEM;
3565         data->client = clp;
3566         data->timestamp = jiffies;
3567         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3568                         &nfs4_renew_ops, data);
3569 }
3570
3571 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3572 {
3573         struct rpc_message msg = {
3574                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3575                 .rpc_argp       = clp,
3576                 .rpc_cred       = cred,
3577         };
3578         unsigned long now = jiffies;
3579         int status;
3580
3581         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3582         if (status < 0)
3583                 return status;
3584         do_renew_lease(clp, now);
3585         return 0;
3586 }
3587
3588 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3589 {
3590         return (server->caps & NFS_CAP_ACLS)
3591                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3592                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3593 }
3594
3595 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3596  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3597  * the stack.
3598  */
3599 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3600
3601 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3602                 struct page **pages, unsigned int *pgbase)
3603 {
3604         struct page *newpage, **spages;
3605         int rc = 0;
3606         size_t len;
3607         spages = pages;
3608
3609         do {
3610                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3611                 newpage = alloc_page(GFP_KERNEL);
3612
3613                 if (newpage == NULL)
3614                         goto unwind;
3615                 memcpy(page_address(newpage), buf, len);
3616                 buf += len;
3617                 buflen -= len;
3618                 *pages++ = newpage;
3619                 rc++;
3620         } while (buflen != 0);
3621
3622         return rc;
3623
3624 unwind:
3625         for(; rc > 0; rc--)
3626                 __free_page(spages[rc-1]);
3627         return -ENOMEM;
3628 }
3629
3630 struct nfs4_cached_acl {
3631         int cached;
3632         size_t len;
3633         char data[0];
3634 };
3635
3636 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3637 {
3638         struct nfs_inode *nfsi = NFS_I(inode);
3639
3640         spin_lock(&inode->i_lock);
3641         kfree(nfsi->nfs4_acl);
3642         nfsi->nfs4_acl = acl;
3643         spin_unlock(&inode->i_lock);
3644 }
3645
3646 static void nfs4_zap_acl_attr(struct inode *inode)
3647 {
3648         nfs4_set_cached_acl(inode, NULL);
3649 }
3650
3651 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3652 {
3653         struct nfs_inode *nfsi = NFS_I(inode);
3654         struct nfs4_cached_acl *acl;
3655         int ret = -ENOENT;
3656
3657         spin_lock(&inode->i_lock);
3658         acl = nfsi->nfs4_acl;
3659         if (acl == NULL)
3660                 goto out;
3661         if (buf == NULL) /* user is just asking for length */
3662                 goto out_len;
3663         if (acl->cached == 0)
3664                 goto out;
3665         ret = -ERANGE; /* see getxattr(2) man page */
3666         if (acl->len > buflen)
3667                 goto out;
3668         memcpy(buf, acl->data, acl->len);
3669 out_len:
3670         ret = acl->len;
3671 out:
3672         spin_unlock(&inode->i_lock);
3673         return ret;
3674 }
3675
3676 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3677 {
3678         struct nfs4_cached_acl *acl;
3679
3680         if (pages && acl_len <= PAGE_SIZE) {
3681                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3682                 if (acl == NULL)
3683                         goto out;
3684                 acl->cached = 1;
3685                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3686         } else {
3687                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3688                 if (acl == NULL)
3689                         goto out;
3690                 acl->cached = 0;
3691         }
3692         acl->len = acl_len;
3693 out:
3694         nfs4_set_cached_acl(inode, acl);
3695 }
3696
3697 /*
3698  * The getxattr API returns the required buffer length when called with a
3699  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3700  * the required buf.  On a NULL buf, we send a page of data to the server
3701  * guessing that the ACL request can be serviced by a page. If so, we cache
3702  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3703  * the cache. If not so, we throw away the page, and cache the required
3704  * length. The next getxattr call will then produce another round trip to
3705  * the server, this time with the input buf of the required size.
3706  */
3707 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3708 {
3709         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3710         struct nfs_getaclargs args = {
3711                 .fh = NFS_FH(inode),
3712                 .acl_pages = pages,
3713                 .acl_len = buflen,
3714         };
3715         struct nfs_getaclres res = {
3716                 .acl_len = buflen,
3717         };
3718         struct rpc_message msg = {
3719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3720                 .rpc_argp = &args,
3721                 .rpc_resp = &res,
3722         };
3723         int ret = -ENOMEM, npages, i, acl_len = 0;
3724
3725         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3726         /* As long as we're doing a round trip to the server anyway,
3727          * let's be prepared for a page of acl data. */
3728         if (npages == 0)
3729                 npages = 1;
3730
3731         /* Add an extra page to handle the bitmap returned */
3732         npages++;
3733
3734         for (i = 0; i < npages; i++) {
3735                 pages[i] = alloc_page(GFP_KERNEL);
3736                 if (!pages[i])
3737                         goto out_free;
3738         }
3739
3740         /* for decoding across pages */
3741         res.acl_scratch = alloc_page(GFP_KERNEL);
3742         if (!res.acl_scratch)
3743                 goto out_free;
3744
3745         args.acl_len = npages * PAGE_SIZE;
3746         args.acl_pgbase = 0;
3747
3748         /* Let decode_getfacl know not to fail if the ACL data is larger than
3749          * the page we send as a guess */
3750         if (buf == NULL)
3751                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3752
3753         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3754                 __func__, buf, buflen, npages, args.acl_len);
3755         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3756                              &msg, &args.seq_args, &res.seq_res, 0);
3757         if (ret)
3758                 goto out_free;
3759
3760         acl_len = res.acl_len - res.acl_data_offset;
3761         if (acl_len > args.acl_len)
3762                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3763         else
3764                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3765                                       acl_len);
3766         if (buf) {
3767                 ret = -ERANGE;
3768                 if (acl_len > buflen)
3769                         goto out_free;
3770                 _copy_from_pages(buf, pages, res.acl_data_offset,
3771                                 acl_len);
3772         }
3773         ret = acl_len;
3774 out_free:
3775         for (i = 0; i < npages; i++)
3776                 if (pages[i])
3777                         __free_page(pages[i]);
3778         if (res.acl_scratch)
3779                 __free_page(res.acl_scratch);
3780         return ret;
3781 }
3782
3783 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3784 {
3785         struct nfs4_exception exception = { };
3786         ssize_t ret;
3787         do {
3788                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3789                 if (ret >= 0)
3790                         break;
3791                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3792         } while (exception.retry);
3793         return ret;
3794 }
3795
3796 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3797 {
3798         struct nfs_server *server = NFS_SERVER(inode);
3799         int ret;
3800
3801         if (!nfs4_server_supports_acls(server))
3802                 return -EOPNOTSUPP;
3803         ret = nfs_revalidate_inode(server, inode);
3804         if (ret < 0)
3805                 return ret;
3806         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3807                 nfs_zap_acl_cache(inode);
3808         ret = nfs4_read_cached_acl(inode, buf, buflen);
3809         if (ret != -ENOENT)
3810                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3811                  * but no cached acl data, just the acl length */
3812                 return ret;
3813         return nfs4_get_acl_uncached(inode, buf, buflen);
3814 }
3815
3816 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3817 {
3818         struct nfs_server *server = NFS_SERVER(inode);
3819         struct page *pages[NFS4ACL_MAXPAGES];
3820         struct nfs_setaclargs arg = {
3821                 .fh             = NFS_FH(inode),
3822                 .acl_pages      = pages,
3823                 .acl_len        = buflen,
3824         };
3825         struct nfs_setaclres res;
3826         struct rpc_message msg = {
3827                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3828                 .rpc_argp       = &arg,
3829                 .rpc_resp       = &res,
3830         };
3831         int ret, i;
3832
3833         if (!nfs4_server_supports_acls(server))
3834                 return -EOPNOTSUPP;
3835         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3836         if (i < 0)
3837                 return i;
3838         nfs_inode_return_delegation(inode);
3839         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3840
3841         /*
3842          * Free each page after tx, so the only ref left is
3843          * held by the network stack
3844          */
3845         for (; i > 0; i--)
3846                 put_page(pages[i-1]);
3847
3848         /*
3849          * Acl update can result in inode attribute update.
3850          * so mark the attribute cache invalid.
3851          */
3852         spin_lock(&inode->i_lock);
3853         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3854         spin_unlock(&inode->i_lock);
3855         nfs_access_zap_cache(inode);
3856         nfs_zap_acl_cache(inode);
3857         return ret;
3858 }
3859
3860 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3861 {
3862         struct nfs4_exception exception = { };
3863         int err;
3864         do {
3865                 err = nfs4_handle_exception(NFS_SERVER(inode),
3866                                 __nfs4_proc_set_acl(inode, buf, buflen),
3867                                 &exception);
3868         } while (exception.retry);
3869         return err;
3870 }
3871
3872 static int
3873 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3874 {
3875         struct nfs_client *clp = server->nfs_client;
3876
3877         if (task->tk_status >= 0)
3878                 return 0;
3879         switch(task->tk_status) {
3880                 case -NFS4ERR_DELEG_REVOKED:
3881                 case -NFS4ERR_ADMIN_REVOKED:
3882                 case -NFS4ERR_BAD_STATEID:
3883                         if (state == NULL)
3884                                 break;
3885                         nfs_remove_bad_delegation(state->inode);
3886                 case -NFS4ERR_OPENMODE:
3887                         if (state == NULL)
3888                                 break;
3889                         nfs4_schedule_stateid_recovery(server, state);
3890                         goto wait_on_recovery;
3891                 case -NFS4ERR_EXPIRED:
3892                         if (state != NULL)
3893                                 nfs4_schedule_stateid_recovery(server, state);
3894                 case -NFS4ERR_STALE_STATEID:
3895                 case -NFS4ERR_STALE_CLIENTID:
3896                         nfs4_schedule_lease_recovery(clp);
3897                         goto wait_on_recovery;
3898 #if defined(CONFIG_NFS_V4_1)
3899                 case -NFS4ERR_BADSESSION:
3900                 case -NFS4ERR_BADSLOT:
3901                 case -NFS4ERR_BAD_HIGH_SLOT:
3902                 case -NFS4ERR_DEADSESSION:
3903                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3904                 case -NFS4ERR_SEQ_FALSE_RETRY:
3905                 case -NFS4ERR_SEQ_MISORDERED:
3906                         dprintk("%s ERROR %d, Reset session\n", __func__,
3907                                 task->tk_status);
3908                         nfs4_schedule_session_recovery(clp->cl_session);
3909                         task->tk_status = 0;
3910                         return -EAGAIN;
3911 #endif /* CONFIG_NFS_V4_1 */
3912                 case -NFS4ERR_DELAY:
3913                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3914                 case -NFS4ERR_GRACE:
3915                 case -EKEYEXPIRED:
3916                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3917                         task->tk_status = 0;
3918                         return -EAGAIN;
3919                 case -NFS4ERR_RETRY_UNCACHED_REP:
3920                 case -NFS4ERR_OLD_STATEID:
3921                         task->tk_status = 0;
3922                         return -EAGAIN;
3923         }
3924         task->tk_status = nfs4_map_errors(task->tk_status);
3925         return 0;
3926 wait_on_recovery:
3927         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3928         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3929                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3930         task->tk_status = 0;
3931         return -EAGAIN;
3932 }
3933
3934 static void nfs4_construct_boot_verifier(struct nfs_client *clp,
3935                                          nfs4_verifier *bootverf)
3936 {
3937         __be32 verf[2];
3938
3939         verf[0] = htonl((u32)clp->cl_boot_time.tv_sec);
3940         verf[1] = htonl((u32)clp->cl_boot_time.tv_nsec);
3941         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3942 }
3943
3944 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3945                 unsigned short port, struct rpc_cred *cred,
3946                 struct nfs4_setclientid_res *res)
3947 {
3948         nfs4_verifier sc_verifier;
3949         struct nfs4_setclientid setclientid = {
3950                 .sc_verifier = &sc_verifier,
3951                 .sc_prog = program,
3952                 .sc_cb_ident = clp->cl_cb_ident,
3953         };
3954         struct rpc_message msg = {
3955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3956                 .rpc_argp = &setclientid,
3957                 .rpc_resp = res,
3958                 .rpc_cred = cred,
3959         };
3960         int loop = 0;
3961         int status;
3962
3963         nfs4_construct_boot_verifier(clp, &sc_verifier);
3964
3965         for(;;) {
3966                 rcu_read_lock();
3967                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3968                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3969                                 clp->cl_ipaddr,
3970                                 rpc_peeraddr2str(clp->cl_rpcclient,
3971                                                         RPC_DISPLAY_ADDR),
3972                                 rpc_peeraddr2str(clp->cl_rpcclient,
3973                                                         RPC_DISPLAY_PROTO),
3974                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3975                                 clp->cl_id_uniquifier);
3976                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3977                                 sizeof(setclientid.sc_netid),
3978                                 rpc_peeraddr2str(clp->cl_rpcclient,
3979                                                         RPC_DISPLAY_NETID));
3980                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3981                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3982                                 clp->cl_ipaddr, port >> 8, port & 255);
3983                 rcu_read_unlock();
3984
3985                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3986                 if (status != -NFS4ERR_CLID_INUSE)
3987                         break;
3988                 if (loop != 0) {
3989                         ++clp->cl_id_uniquifier;
3990                         break;
3991                 }
3992                 ++loop;
3993                 ssleep(clp->cl_lease_time / HZ + 1);
3994         }
3995         return status;
3996 }
3997
3998 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3999                 struct nfs4_setclientid_res *arg,
4000                 struct rpc_cred *cred)
4001 {
4002         struct nfs_fsinfo fsinfo;
4003         struct rpc_message msg = {
4004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4005                 .rpc_argp = arg,
4006                 .rpc_resp = &fsinfo,
4007                 .rpc_cred = cred,
4008         };
4009         unsigned long now;
4010         int status;
4011
4012         now = jiffies;
4013         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4014         if (status == 0) {
4015                 spin_lock(&clp->cl_lock);
4016                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4017                 clp->cl_last_renewal = now;
4018                 spin_unlock(&clp->cl_lock);
4019         }
4020         return status;
4021 }
4022
4023 struct nfs4_delegreturndata {
4024         struct nfs4_delegreturnargs args;
4025         struct nfs4_delegreturnres res;
4026         struct nfs_fh fh;
4027         nfs4_stateid stateid;
4028         unsigned long timestamp;
4029         struct nfs_fattr fattr;
4030         int rpc_status;
4031 };
4032
4033 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4034 {
4035         struct nfs4_delegreturndata *data = calldata;
4036
4037         if (!nfs4_sequence_done(task, &data->res.seq_res))
4038                 return;
4039
4040         switch (task->tk_status) {
4041         case -NFS4ERR_STALE_STATEID:
4042         case -NFS4ERR_EXPIRED:
4043         case 0:
4044                 renew_lease(data->res.server, data->timestamp);
4045                 break;
4046         default:
4047                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4048                                 -EAGAIN) {
4049                         rpc_restart_call_prepare(task);
4050                         return;
4051                 }
4052         }
4053         data->rpc_status = task->tk_status;
4054 }
4055
4056 static void nfs4_delegreturn_release(void *calldata)
4057 {
4058         kfree(calldata);
4059 }
4060
4061 #if defined(CONFIG_NFS_V4_1)
4062 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4063 {
4064         struct nfs4_delegreturndata *d_data;
4065
4066         d_data = (struct nfs4_delegreturndata *)data;
4067
4068         if (nfs4_setup_sequence(d_data->res.server,
4069                                 &d_data->args.seq_args,
4070                                 &d_data->res.seq_res, task))
4071                 return;
4072         rpc_call_start(task);
4073 }
4074 #endif /* CONFIG_NFS_V4_1 */
4075
4076 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4077 #if defined(CONFIG_NFS_V4_1)
4078         .rpc_call_prepare = nfs4_delegreturn_prepare,
4079 #endif /* CONFIG_NFS_V4_1 */
4080         .rpc_call_done = nfs4_delegreturn_done,
4081         .rpc_release = nfs4_delegreturn_release,
4082 };
4083
4084 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4085 {
4086         struct nfs4_delegreturndata *data;
4087         struct nfs_server *server = NFS_SERVER(inode);
4088         struct rpc_task *task;
4089         struct rpc_message msg = {
4090                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4091                 .rpc_cred = cred,
4092         };
4093         struct rpc_task_setup task_setup_data = {
4094                 .rpc_client = server->client,
4095                 .rpc_message = &msg,
4096                 .callback_ops = &nfs4_delegreturn_ops,
4097                 .flags = RPC_TASK_ASYNC,
4098         };
4099         int status = 0;
4100
4101         data = kzalloc(sizeof(*data), GFP_NOFS);
4102         if (data == NULL)
4103                 return -ENOMEM;
4104         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4105         data->args.fhandle = &data->fh;
4106         data->args.stateid = &data->stateid;
4107         data->args.bitmask = server->attr_bitmask;
4108         nfs_copy_fh(&data->fh, NFS_FH(inode));
4109         nfs4_stateid_copy(&data->stateid, stateid);
4110         data->res.fattr = &data->fattr;
4111         data->res.server = server;
4112         nfs_fattr_init(data->res.fattr);
4113         data->timestamp = jiffies;
4114         data->rpc_status = 0;
4115
4116         task_setup_data.callback_data = data;
4117         msg.rpc_argp = &data->args;
4118         msg.rpc_resp = &data->res;
4119         task = rpc_run_task(&task_setup_data);
4120         if (IS_ERR(task))
4121                 return PTR_ERR(task);
4122         if (!issync)
4123                 goto out;
4124         status = nfs4_wait_for_completion_rpc_task(task);
4125         if (status != 0)
4126                 goto out;
4127         status = data->rpc_status;
4128         if (status != 0)
4129                 goto out;
4130         nfs_refresh_inode(inode, &data->fattr);
4131 out:
4132         rpc_put_task(task);
4133         return status;
4134 }
4135
4136 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4137 {
4138         struct nfs_server *server = NFS_SERVER(inode);
4139         struct nfs4_exception exception = { };
4140         int err;
4141         do {
4142                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4143                 switch (err) {
4144                         case -NFS4ERR_STALE_STATEID:
4145                         case -NFS4ERR_EXPIRED:
4146                         case 0:
4147                                 return 0;
4148                 }
4149                 err = nfs4_handle_exception(server, err, &exception);
4150         } while (exception.retry);
4151         return err;
4152 }
4153
4154 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4155 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4156
4157 /*
4158  * sleep, with exponential backoff, and retry the LOCK operation.
4159  */
4160 static unsigned long
4161 nfs4_set_lock_task_retry(unsigned long timeout)
4162 {
4163         freezable_schedule_timeout_killable(timeout);
4164         timeout <<= 1;
4165         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4166                 return NFS4_LOCK_MAXTIMEOUT;
4167         return timeout;
4168 }
4169
4170 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4171 {
4172         struct inode *inode = state->inode;
4173         struct nfs_server *server = NFS_SERVER(inode);
4174         struct nfs_client *clp = server->nfs_client;
4175         struct nfs_lockt_args arg = {
4176                 .fh = NFS_FH(inode),
4177                 .fl = request,
4178         };
4179         struct nfs_lockt_res res = {
4180                 .denied = request,
4181         };
4182         struct rpc_message msg = {
4183                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4184                 .rpc_argp       = &arg,
4185                 .rpc_resp       = &res,
4186                 .rpc_cred       = state->owner->so_cred,
4187         };
4188         struct nfs4_lock_state *lsp;
4189         int status;
4190
4191         arg.lock_owner.clientid = clp->cl_clientid;
4192         status = nfs4_set_lock_state(state, request);
4193         if (status != 0)
4194                 goto out;
4195         lsp = request->fl_u.nfs4_fl.owner;
4196         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4197         arg.lock_owner.s_dev = server->s_dev;
4198         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4199         switch (status) {
4200                 case 0:
4201                         request->fl_type = F_UNLCK;
4202                         break;
4203                 case -NFS4ERR_DENIED:
4204                         status = 0;
4205         }
4206         request->fl_ops->fl_release_private(request);
4207 out:
4208         return status;
4209 }
4210
4211 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4212 {
4213         struct nfs4_exception exception = { };
4214         int err;
4215
4216         do {
4217                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4218                                 _nfs4_proc_getlk(state, cmd, request),
4219                                 &exception);
4220         } while (exception.retry);
4221         return err;
4222 }
4223
4224 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4225 {
4226         int res = 0;
4227         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4228                 case FL_POSIX:
4229                         res = posix_lock_file_wait(file, fl);
4230                         break;
4231                 case FL_FLOCK:
4232                         res = flock_lock_file_wait(file, fl);
4233                         break;
4234                 default:
4235                         BUG();
4236         }
4237         return res;
4238 }
4239
4240 struct nfs4_unlockdata {
4241         struct nfs_locku_args arg;
4242         struct nfs_locku_res res;
4243         struct nfs4_lock_state *lsp;
4244         struct nfs_open_context *ctx;
4245         struct file_lock fl;
4246         const struct nfs_server *server;
4247         unsigned long timestamp;
4248 };
4249
4250 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4251                 struct nfs_open_context *ctx,
4252                 struct nfs4_lock_state *lsp,
4253                 struct nfs_seqid *seqid)
4254 {
4255         struct nfs4_unlockdata *p;
4256         struct inode *inode = lsp->ls_state->inode;
4257
4258         p = kzalloc(sizeof(*p), GFP_NOFS);
4259         if (p == NULL)
4260                 return NULL;
4261         p->arg.fh = NFS_FH(inode);
4262         p->arg.fl = &p->fl;
4263         p->arg.seqid = seqid;
4264         p->res.seqid = seqid;
4265         p->arg.stateid = &lsp->ls_stateid;
4266         p->lsp = lsp;
4267         atomic_inc(&lsp->ls_count);
4268         /* Ensure we don't close file until we're done freeing locks! */
4269         p->ctx = get_nfs_open_context(ctx);
4270         memcpy(&p->fl, fl, sizeof(p->fl));
4271         p->server = NFS_SERVER(inode);
4272         return p;
4273 }
4274
4275 static void nfs4_locku_release_calldata(void *data)
4276 {
4277         struct nfs4_unlockdata *calldata = data;
4278         nfs_free_seqid(calldata->arg.seqid);
4279         nfs4_put_lock_state(calldata->lsp);
4280         put_nfs_open_context(calldata->ctx);
4281         kfree(calldata);
4282 }
4283
4284 static void nfs4_locku_done(struct rpc_task *task, void *data)
4285 {
4286         struct nfs4_unlockdata *calldata = data;
4287
4288         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4289                 return;
4290         switch (task->tk_status) {
4291                 case 0:
4292                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4293                                         &calldata->res.stateid);
4294                         renew_lease(calldata->server, calldata->timestamp);
4295                         break;
4296                 case -NFS4ERR_BAD_STATEID:
4297                 case -NFS4ERR_OLD_STATEID:
4298                 case -NFS4ERR_STALE_STATEID:
4299                 case -NFS4ERR_EXPIRED:
4300                         break;
4301                 default:
4302                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4303                                 rpc_restart_call_prepare(task);
4304         }
4305 }
4306
4307 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4308 {
4309         struct nfs4_unlockdata *calldata = data;
4310
4311         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4312                 return;
4313         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4314                 /* Note: exit _without_ running nfs4_locku_done */
4315                 task->tk_action = NULL;
4316                 return;
4317         }
4318         calldata->timestamp = jiffies;
4319         if (nfs4_setup_sequence(calldata->server,
4320                                 &calldata->arg.seq_args,
4321                                 &calldata->res.seq_res, task))
4322                 return;
4323         rpc_call_start(task);
4324 }
4325
4326 static const struct rpc_call_ops nfs4_locku_ops = {
4327         .rpc_call_prepare = nfs4_locku_prepare,
4328         .rpc_call_done = nfs4_locku_done,
4329         .rpc_release = nfs4_locku_release_calldata,
4330 };
4331
4332 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4333                 struct nfs_open_context *ctx,
4334                 struct nfs4_lock_state *lsp,
4335                 struct nfs_seqid *seqid)
4336 {
4337         struct nfs4_unlockdata *data;
4338         struct rpc_message msg = {
4339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4340                 .rpc_cred = ctx->cred,
4341         };
4342         struct rpc_task_setup task_setup_data = {
4343                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4344                 .rpc_message = &msg,
4345                 .callback_ops = &nfs4_locku_ops,
4346                 .workqueue = nfsiod_workqueue,
4347                 .flags = RPC_TASK_ASYNC,
4348         };
4349
4350         /* Ensure this is an unlock - when canceling a lock, the
4351          * canceled lock is passed in, and it won't be an unlock.
4352          */
4353         fl->fl_type = F_UNLCK;
4354
4355         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4356         if (data == NULL) {
4357                 nfs_free_seqid(seqid);
4358                 return ERR_PTR(-ENOMEM);
4359         }
4360
4361         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4362         msg.rpc_argp = &data->arg;
4363         msg.rpc_resp = &data->res;
4364         task_setup_data.callback_data = data;
4365         return rpc_run_task(&task_setup_data);
4366 }
4367
4368 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4369 {
4370         struct nfs_inode *nfsi = NFS_I(state->inode);
4371         struct nfs_seqid *seqid;
4372         struct nfs4_lock_state *lsp;
4373         struct rpc_task *task;
4374         int status = 0;
4375         unsigned char fl_flags = request->fl_flags;
4376
4377         status = nfs4_set_lock_state(state, request);
4378         /* Unlock _before_ we do the RPC call */
4379         request->fl_flags |= FL_EXISTS;
4380         down_read(&nfsi->rwsem);
4381         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4382                 up_read(&nfsi->rwsem);
4383                 goto out;
4384         }
4385         up_read(&nfsi->rwsem);
4386         if (status != 0)
4387                 goto out;
4388         /* Is this a delegated lock? */
4389         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4390                 goto out;
4391         lsp = request->fl_u.nfs4_fl.owner;
4392         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4393         status = -ENOMEM;
4394         if (seqid == NULL)
4395                 goto out;
4396         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4397         status = PTR_ERR(task);
4398         if (IS_ERR(task))
4399                 goto out;
4400         status = nfs4_wait_for_completion_rpc_task(task);
4401         rpc_put_task(task);
4402 out:
4403         request->fl_flags = fl_flags;
4404         return status;
4405 }
4406
4407 struct nfs4_lockdata {
4408         struct nfs_lock_args arg;
4409         struct nfs_lock_res res;
4410         struct nfs4_lock_state *lsp;
4411         struct nfs_open_context *ctx;
4412         struct file_lock fl;
4413         unsigned long timestamp;
4414         int rpc_status;
4415         int cancelled;
4416         struct nfs_server *server;
4417 };
4418
4419 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4420                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4421                 gfp_t gfp_mask)
4422 {
4423         struct nfs4_lockdata *p;
4424         struct inode *inode = lsp->ls_state->inode;
4425         struct nfs_server *server = NFS_SERVER(inode);
4426
4427         p = kzalloc(sizeof(*p), gfp_mask);
4428         if (p == NULL)
4429                 return NULL;
4430
4431         p->arg.fh = NFS_FH(inode);
4432         p->arg.fl = &p->fl;
4433         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4434         if (p->arg.open_seqid == NULL)
4435                 goto out_free;
4436         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4437         if (p->arg.lock_seqid == NULL)
4438                 goto out_free_seqid;
4439         p->arg.lock_stateid = &lsp->ls_stateid;
4440         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4441         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4442         p->arg.lock_owner.s_dev = server->s_dev;
4443         p->res.lock_seqid = p->arg.lock_seqid;
4444         p->lsp = lsp;
4445         p->server = server;
4446         atomic_inc(&lsp->ls_count);
4447         p->ctx = get_nfs_open_context(ctx);
4448         memcpy(&p->fl, fl, sizeof(p->fl));
4449         return p;
4450 out_free_seqid:
4451         nfs_free_seqid(p->arg.open_seqid);
4452 out_free:
4453         kfree(p);
4454         return NULL;
4455 }
4456
4457 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4458 {
4459         struct nfs4_lockdata *data = calldata;
4460         struct nfs4_state *state = data->lsp->ls_state;
4461
4462         dprintk("%s: begin!\n", __func__);
4463         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4464                 return;
4465         /* Do we need to do an open_to_lock_owner? */
4466         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4467                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4468                         return;
4469                 data->arg.open_stateid = &state->stateid;
4470                 data->arg.new_lock_owner = 1;
4471                 data->res.open_seqid = data->arg.open_seqid;
4472         } else
4473                 data->arg.new_lock_owner = 0;
4474         data->timestamp = jiffies;
4475         if (nfs4_setup_sequence(data->server,
4476                                 &data->arg.seq_args,
4477                                 &data->res.seq_res, task))
4478                 return;
4479         rpc_call_start(task);
4480         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4481 }
4482
4483 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4484 {
4485         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4486         nfs4_lock_prepare(task, calldata);
4487 }
4488
4489 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4490 {
4491         struct nfs4_lockdata *data = calldata;
4492
4493         dprintk("%s: begin!\n", __func__);
4494
4495         if (!nfs4_sequence_done(task, &data->res.seq_res))
4496                 return;
4497
4498         data->rpc_status = task->tk_status;
4499         if (data->arg.new_lock_owner != 0) {
4500                 if (data->rpc_status == 0)
4501                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4502                 else
4503                         goto out;
4504         }
4505         if (data->rpc_status == 0) {
4506                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4507                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4508                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4509         }
4510 out:
4511         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4512 }
4513
4514 static void nfs4_lock_release(void *calldata)
4515 {
4516         struct nfs4_lockdata *data = calldata;
4517
4518         dprintk("%s: begin!\n", __func__);
4519         nfs_free_seqid(data->arg.open_seqid);
4520         if (data->cancelled != 0) {
4521                 struct rpc_task *task;
4522                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4523                                 data->arg.lock_seqid);
4524                 if (!IS_ERR(task))
4525                         rpc_put_task_async(task);
4526                 dprintk("%s: cancelling lock!\n", __func__);
4527         } else
4528                 nfs_free_seqid(data->arg.lock_seqid);
4529         nfs4_put_lock_state(data->lsp);
4530         put_nfs_open_context(data->ctx);
4531         kfree(data);
4532         dprintk("%s: done!\n", __func__);
4533 }
4534
4535 static const struct rpc_call_ops nfs4_lock_ops = {
4536         .rpc_call_prepare = nfs4_lock_prepare,
4537         .rpc_call_done = nfs4_lock_done,
4538         .rpc_release = nfs4_lock_release,
4539 };
4540
4541 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4542         .rpc_call_prepare = nfs4_recover_lock_prepare,
4543         .rpc_call_done = nfs4_lock_done,
4544         .rpc_release = nfs4_lock_release,
4545 };
4546
4547 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4548 {
4549         switch (error) {
4550         case -NFS4ERR_ADMIN_REVOKED:
4551         case -NFS4ERR_BAD_STATEID:
4552                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4553                 if (new_lock_owner != 0 ||
4554                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4555                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4556                 break;
4557         case -NFS4ERR_STALE_STATEID:
4558                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4559         case -NFS4ERR_EXPIRED:
4560                 nfs4_schedule_lease_recovery(server->nfs_client);
4561         };
4562 }
4563
4564 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4565 {
4566         struct nfs4_lockdata *data;
4567         struct rpc_task *task;
4568         struct rpc_message msg = {
4569                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4570                 .rpc_cred = state->owner->so_cred,
4571         };
4572         struct rpc_task_setup task_setup_data = {
4573                 .rpc_client = NFS_CLIENT(state->inode),
4574                 .rpc_message = &msg,
4575                 .callback_ops = &nfs4_lock_ops,
4576                 .workqueue = nfsiod_workqueue,
4577                 .flags = RPC_TASK_ASYNC,
4578         };
4579         int ret;
4580
4581         dprintk("%s: begin!\n", __func__);
4582         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4583                         fl->fl_u.nfs4_fl.owner,
4584                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4585         if (data == NULL)
4586                 return -ENOMEM;
4587         if (IS_SETLKW(cmd))
4588                 data->arg.block = 1;
4589         if (recovery_type > NFS_LOCK_NEW) {
4590                 if (recovery_type == NFS_LOCK_RECLAIM)
4591                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4592                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4593         }
4594         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4595         msg.rpc_argp = &data->arg;
4596         msg.rpc_resp = &data->res;
4597         task_setup_data.callback_data = data;
4598         task = rpc_run_task(&task_setup_data);
4599         if (IS_ERR(task))
4600                 return PTR_ERR(task);
4601         ret = nfs4_wait_for_completion_rpc_task(task);
4602         if (ret == 0) {
4603                 ret = data->rpc_status;
4604                 if (ret)
4605                         nfs4_handle_setlk_error(data->server, data->lsp,
4606                                         data->arg.new_lock_owner, ret);
4607         } else
4608                 data->cancelled = 1;
4609         rpc_put_task(task);
4610         dprintk("%s: done, ret = %d!\n", __func__, ret);
4611         return ret;
4612 }
4613
4614 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4615 {
4616         struct nfs_server *server = NFS_SERVER(state->inode);
4617         struct nfs4_exception exception = {
4618                 .inode = state->inode,
4619         };
4620         int err;
4621
4622         do {
4623                 /* Cache the lock if possible... */
4624                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4625                         return 0;
4626                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4627                 if (err != -NFS4ERR_DELAY)
4628                         break;
4629                 nfs4_handle_exception(server, err, &exception);
4630         } while (exception.retry);
4631         return err;
4632 }
4633
4634 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4635 {
4636         struct nfs_server *server = NFS_SERVER(state->inode);
4637         struct nfs4_exception exception = {
4638                 .inode = state->inode,
4639         };
4640         int err;
4641
4642         err = nfs4_set_lock_state(state, request);
4643         if (err != 0)
4644                 return err;
4645         do {
4646                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4647                         return 0;
4648                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4649                 switch (err) {
4650                 default:
4651                         goto out;
4652                 case -NFS4ERR_GRACE:
4653                 case -NFS4ERR_DELAY:
4654                         nfs4_handle_exception(server, err, &exception);
4655                         err = 0;
4656                 }
4657         } while (exception.retry);
4658 out:
4659         return err;
4660 }
4661
4662 #if defined(CONFIG_NFS_V4_1)
4663 static int nfs41_check_expired_locks(struct nfs4_state *state)
4664 {
4665         int status, ret = NFS_OK;
4666         struct nfs4_lock_state *lsp;
4667         struct nfs_server *server = NFS_SERVER(state->inode);
4668
4669         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4670                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4671                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4672                         if (status != NFS_OK) {
4673                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4674                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4675                                 ret = status;
4676                         }
4677                 }
4678         };
4679
4680         return ret;
4681 }
4682
4683 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4684 {
4685         int status = NFS_OK;
4686
4687         if (test_bit(LK_STATE_IN_USE, &state->flags))
4688                 status = nfs41_check_expired_locks(state);
4689         if (status == NFS_OK)
4690                 return status;
4691         return nfs4_lock_expired(state, request);
4692 }
4693 #endif
4694
4695 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4696 {
4697         struct nfs_inode *nfsi = NFS_I(state->inode);
4698         unsigned char fl_flags = request->fl_flags;
4699         int status = -ENOLCK;
4700
4701         if ((fl_flags & FL_POSIX) &&
4702                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4703                 goto out;
4704         /* Is this a delegated open? */
4705         status = nfs4_set_lock_state(state, request);
4706         if (status != 0)
4707                 goto out;
4708         request->fl_flags |= FL_ACCESS;
4709         status = do_vfs_lock(request->fl_file, request);
4710         if (status < 0)
4711                 goto out;
4712         down_read(&nfsi->rwsem);
4713         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4714                 /* Yes: cache locks! */
4715                 /* ...but avoid races with delegation recall... */
4716                 request->fl_flags = fl_flags & ~FL_SLEEP;
4717                 status = do_vfs_lock(request->fl_file, request);
4718                 goto out_unlock;
4719         }
4720         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4721         if (status != 0)
4722                 goto out_unlock;
4723         /* Note: we always want to sleep here! */
4724         request->fl_flags = fl_flags | FL_SLEEP;
4725         if (do_vfs_lock(request->fl_file, request) < 0)
4726                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4727                         "manager!\n", __func__);
4728 out_unlock:
4729         up_read(&nfsi->rwsem);
4730 out:
4731         request->fl_flags = fl_flags;
4732         return status;
4733 }
4734
4735 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4736 {
4737         struct nfs4_exception exception = {
4738                 .state = state,
4739                 .inode = state->inode,
4740         };
4741         int err;
4742
4743         do {
4744                 err = _nfs4_proc_setlk(state, cmd, request);
4745                 if (err == -NFS4ERR_DENIED)
4746                         err = -EAGAIN;
4747                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4748                                 err, &exception);
4749         } while (exception.retry);
4750         return err;
4751 }
4752
4753 static int
4754 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4755 {
4756         struct nfs_open_context *ctx;
4757         struct nfs4_state *state;
4758         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4759         int status;
4760
4761         /* verify open state */
4762         ctx = nfs_file_open_context(filp);
4763         state = ctx->state;
4764
4765         if (request->fl_start < 0 || request->fl_end < 0)
4766                 return -EINVAL;
4767
4768         if (IS_GETLK(cmd)) {
4769                 if (state != NULL)
4770                         return nfs4_proc_getlk(state, F_GETLK, request);
4771                 return 0;
4772         }
4773
4774         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4775                 return -EINVAL;
4776
4777         if (request->fl_type == F_UNLCK) {
4778                 if (state != NULL)
4779                         return nfs4_proc_unlck(state, cmd, request);
4780                 return 0;
4781         }
4782
4783         if (state == NULL)
4784                 return -ENOLCK;
4785         /*
4786          * Don't rely on the VFS having checked the file open mode,
4787          * since it won't do this for flock() locks.
4788          */
4789         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4790         case F_RDLCK:
4791                 if (!(filp->f_mode & FMODE_READ))
4792                         return -EBADF;
4793                 break;
4794         case F_WRLCK:
4795                 if (!(filp->f_mode & FMODE_WRITE))
4796                         return -EBADF;
4797         }
4798
4799         do {
4800                 status = nfs4_proc_setlk(state, cmd, request);
4801                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4802                         break;
4803                 timeout = nfs4_set_lock_task_retry(timeout);
4804                 status = -ERESTARTSYS;
4805                 if (signalled())
4806                         break;
4807         } while(status < 0);
4808         return status;
4809 }
4810
4811 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4812 {
4813         struct nfs_server *server = NFS_SERVER(state->inode);
4814         struct nfs4_exception exception = { };
4815         int err;
4816
4817         err = nfs4_set_lock_state(state, fl);
4818         if (err != 0)
4819                 goto out;
4820         do {
4821                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4822                 switch (err) {
4823                         default:
4824                                 printk(KERN_ERR "NFS: %s: unhandled error "
4825                                         "%d.\n", __func__, err);
4826                         case 0:
4827                         case -ESTALE:
4828                                 goto out;
4829                         case -NFS4ERR_EXPIRED:
4830                                 nfs4_schedule_stateid_recovery(server, state);
4831                         case -NFS4ERR_STALE_CLIENTID:
4832                         case -NFS4ERR_STALE_STATEID:
4833                                 nfs4_schedule_lease_recovery(server->nfs_client);
4834                                 goto out;
4835                         case -NFS4ERR_BADSESSION:
4836                         case -NFS4ERR_BADSLOT:
4837                         case -NFS4ERR_BAD_HIGH_SLOT:
4838                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4839                         case -NFS4ERR_DEADSESSION:
4840                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4841                                 goto out;
4842                         case -ERESTARTSYS:
4843                                 /*
4844                                  * The show must go on: exit, but mark the
4845                                  * stateid as needing recovery.
4846                                  */
4847                         case -NFS4ERR_DELEG_REVOKED:
4848                         case -NFS4ERR_ADMIN_REVOKED:
4849                         case -NFS4ERR_BAD_STATEID:
4850                         case -NFS4ERR_OPENMODE:
4851                                 nfs4_schedule_stateid_recovery(server, state);
4852                                 err = 0;
4853                                 goto out;
4854                         case -EKEYEXPIRED:
4855                                 /*
4856                                  * User RPCSEC_GSS context has expired.
4857                                  * We cannot recover this stateid now, so
4858                                  * skip it and allow recovery thread to
4859                                  * proceed.
4860                                  */
4861                                 err = 0;
4862                                 goto out;
4863                         case -ENOMEM:
4864                         case -NFS4ERR_DENIED:
4865                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4866                                 err = 0;
4867                                 goto out;
4868                         case -NFS4ERR_DELAY:
4869                                 break;
4870                 }
4871                 err = nfs4_handle_exception(server, err, &exception);
4872         } while (exception.retry);
4873 out:
4874         return err;
4875 }
4876
4877 struct nfs_release_lockowner_data {
4878         struct nfs4_lock_state *lsp;
4879         struct nfs_server *server;
4880         struct nfs_release_lockowner_args args;
4881 };
4882
4883 static void nfs4_release_lockowner_release(void *calldata)
4884 {
4885         struct nfs_release_lockowner_data *data = calldata;
4886         nfs4_free_lock_state(data->server, data->lsp);
4887         kfree(calldata);
4888 }
4889
4890 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4891         .rpc_release = nfs4_release_lockowner_release,
4892 };
4893
4894 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4895 {
4896         struct nfs_server *server = lsp->ls_state->owner->so_server;
4897         struct nfs_release_lockowner_data *data;
4898         struct rpc_message msg = {
4899                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4900         };
4901
4902         if (server->nfs_client->cl_mvops->minor_version != 0)
4903                 return -EINVAL;
4904         data = kmalloc(sizeof(*data), GFP_NOFS);
4905         if (!data)
4906                 return -ENOMEM;
4907         data->lsp = lsp;
4908         data->server = server;
4909         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4910         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4911         data->args.lock_owner.s_dev = server->s_dev;
4912         msg.rpc_argp = &data->args;
4913         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4914         return 0;
4915 }
4916
4917 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4918
4919 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4920                                    const void *buf, size_t buflen,
4921                                    int flags, int type)
4922 {
4923         if (strcmp(key, "") != 0)
4924                 return -EINVAL;
4925
4926         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4927 }
4928
4929 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4930                                    void *buf, size_t buflen, int type)
4931 {
4932         if (strcmp(key, "") != 0)
4933                 return -EINVAL;
4934
4935         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4936 }
4937
4938 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4939                                        size_t list_len, const char *name,
4940                                        size_t name_len, int type)
4941 {
4942         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4943
4944         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4945                 return 0;
4946
4947         if (list && len <= list_len)
4948                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4949         return len;
4950 }
4951
4952 /*
4953  * nfs_fhget will use either the mounted_on_fileid or the fileid
4954  */
4955 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4956 {
4957         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4958                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4959               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4960               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4961                 return;
4962
4963         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4964                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4965         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4966         fattr->nlink = 2;
4967 }
4968
4969 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4970                                    const struct qstr *name,
4971                                    struct nfs4_fs_locations *fs_locations,
4972                                    struct page *page)
4973 {
4974         struct nfs_server *server = NFS_SERVER(dir);
4975         u32 bitmask[2] = {
4976                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4977         };
4978         struct nfs4_fs_locations_arg args = {
4979                 .dir_fh = NFS_FH(dir),
4980                 .name = name,
4981                 .page = page,
4982                 .bitmask = bitmask,
4983         };
4984         struct nfs4_fs_locations_res res = {
4985                 .fs_locations = fs_locations,
4986         };
4987         struct rpc_message msg = {
4988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4989                 .rpc_argp = &args,
4990                 .rpc_resp = &res,
4991         };
4992         int status;
4993
4994         dprintk("%s: start\n", __func__);
4995
4996         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4997          * is not supported */
4998         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4999                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5000         else
5001                 bitmask[0] |= FATTR4_WORD0_FILEID;
5002
5003         nfs_fattr_init(&fs_locations->fattr);
5004         fs_locations->server = server;
5005         fs_locations->nlocations = 0;
5006         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5007         dprintk("%s: returned status = %d\n", __func__, status);
5008         return status;
5009 }
5010
5011 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5012                            const struct qstr *name,
5013                            struct nfs4_fs_locations *fs_locations,
5014                            struct page *page)
5015 {
5016         struct nfs4_exception exception = { };
5017         int err;
5018         do {
5019                 err = nfs4_handle_exception(NFS_SERVER(dir),
5020                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5021                                 &exception);
5022         } while (exception.retry);
5023         return err;
5024 }
5025
5026 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5027 {
5028         int status;
5029         struct nfs4_secinfo_arg args = {
5030                 .dir_fh = NFS_FH(dir),
5031                 .name   = name,
5032         };
5033         struct nfs4_secinfo_res res = {
5034                 .flavors     = flavors,
5035         };
5036         struct rpc_message msg = {
5037                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5038                 .rpc_argp = &args,
5039                 .rpc_resp = &res,
5040         };
5041
5042         dprintk("NFS call  secinfo %s\n", name->name);
5043         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5044         dprintk("NFS reply  secinfo: %d\n", status);
5045         return status;
5046 }
5047
5048 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5049                       struct nfs4_secinfo_flavors *flavors)
5050 {
5051         struct nfs4_exception exception = { };
5052         int err;
5053         do {
5054                 err = nfs4_handle_exception(NFS_SERVER(dir),
5055                                 _nfs4_proc_secinfo(dir, name, flavors),
5056                                 &exception);
5057         } while (exception.retry);
5058         return err;
5059 }
5060
5061 #ifdef CONFIG_NFS_V4_1
5062 /*
5063  * Check the exchange flags returned by the server for invalid flags, having
5064  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5065  * DS flags set.
5066  */
5067 static int nfs4_check_cl_exchange_flags(u32 flags)
5068 {
5069         if (flags & ~EXCHGID4_FLAG_MASK_R)
5070                 goto out_inval;
5071         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5072             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5073                 goto out_inval;
5074         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5075                 goto out_inval;
5076         return NFS_OK;
5077 out_inval:
5078         return -NFS4ERR_INVAL;
5079 }
5080
5081 static bool
5082 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
5083 {
5084         if (a->server_scope_sz == b->server_scope_sz &&
5085             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5086                 return true;
5087
5088         return false;
5089 }
5090
5091 /*
5092  * nfs4_proc_exchange_id()
5093  *
5094  * Since the clientid has expired, all compounds using sessions
5095  * associated with the stale clientid will be returning
5096  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5097  * be in some phase of session reset.
5098  */
5099 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5100 {
5101         nfs4_verifier verifier;
5102         struct nfs41_exchange_id_args args = {
5103                 .verifier = &verifier,
5104                 .client = clp,
5105                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5106         };
5107         struct nfs41_exchange_id_res res = {
5108                 .client = clp,
5109         };
5110         int status;
5111         struct rpc_message msg = {
5112                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5113                 .rpc_argp = &args,
5114                 .rpc_resp = &res,
5115                 .rpc_cred = cred,
5116         };
5117
5118         dprintk("--> %s\n", __func__);
5119         BUG_ON(clp == NULL);
5120
5121         nfs4_construct_boot_verifier(clp, &verifier);
5122
5123         args.id_len = scnprintf(args.id, sizeof(args.id),
5124                                 "%s/%s/%u",
5125                                 clp->cl_ipaddr,
5126                                 clp->cl_rpcclient->cl_nodename,
5127                                 clp->cl_rpcclient->cl_auth->au_flavor);
5128
5129         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
5130         if (unlikely(!res.server_scope)) {
5131                 status = -ENOMEM;
5132                 goto out;
5133         }
5134
5135         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
5136         if (unlikely(!res.impl_id)) {
5137                 status = -ENOMEM;
5138                 goto out_server_scope;
5139         }
5140
5141         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5142         if (!status)
5143                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
5144
5145         if (!status) {
5146                 /* use the most recent implementation id */
5147                 kfree(clp->impl_id);
5148                 clp->impl_id = res.impl_id;
5149         } else
5150                 kfree(res.impl_id);
5151
5152         if (!status) {
5153                 if (clp->server_scope &&
5154                     !nfs41_same_server_scope(clp->server_scope,
5155                                              res.server_scope)) {
5156                         dprintk("%s: server_scope mismatch detected\n",
5157                                 __func__);
5158                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5159                         kfree(clp->server_scope);
5160                         clp->server_scope = NULL;
5161                 }
5162
5163                 if (!clp->server_scope) {
5164                         clp->server_scope = res.server_scope;
5165                         goto out;
5166                 }
5167         }
5168
5169 out_server_scope:
5170         kfree(res.server_scope);
5171 out:
5172         if (clp->impl_id)
5173                 dprintk("%s: Server Implementation ID: "
5174                         "domain: %s, name: %s, date: %llu,%u\n",
5175                         __func__, clp->impl_id->domain, clp->impl_id->name,
5176                         clp->impl_id->date.seconds,
5177                         clp->impl_id->date.nseconds);
5178         dprintk("<-- %s status= %d\n", __func__, status);
5179         return status;
5180 }
5181
5182 struct nfs4_get_lease_time_data {
5183         struct nfs4_get_lease_time_args *args;
5184         struct nfs4_get_lease_time_res *res;
5185         struct nfs_client *clp;
5186 };
5187
5188 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5189                                         void *calldata)
5190 {
5191         int ret;
5192         struct nfs4_get_lease_time_data *data =
5193                         (struct nfs4_get_lease_time_data *)calldata;
5194
5195         dprintk("--> %s\n", __func__);
5196         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5197         /* just setup sequence, do not trigger session recovery
5198            since we're invoked within one */
5199         ret = nfs41_setup_sequence(data->clp->cl_session,
5200                                    &data->args->la_seq_args,
5201                                    &data->res->lr_seq_res, task);
5202
5203         BUG_ON(ret == -EAGAIN);
5204         rpc_call_start(task);
5205         dprintk("<-- %s\n", __func__);
5206 }
5207
5208 /*
5209  * Called from nfs4_state_manager thread for session setup, so don't recover
5210  * from sequence operation or clientid errors.
5211  */
5212 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5213 {
5214         struct nfs4_get_lease_time_data *data =
5215                         (struct nfs4_get_lease_time_data *)calldata;
5216
5217         dprintk("--> %s\n", __func__);
5218         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5219                 return;
5220         switch (task->tk_status) {
5221         case -NFS4ERR_DELAY:
5222         case -NFS4ERR_GRACE:
5223                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5224                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5225                 task->tk_status = 0;
5226                 /* fall through */
5227         case -NFS4ERR_RETRY_UNCACHED_REP:
5228                 rpc_restart_call_prepare(task);
5229                 return;
5230         }
5231         dprintk("<-- %s\n", __func__);
5232 }
5233
5234 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5235         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5236         .rpc_call_done = nfs4_get_lease_time_done,
5237 };
5238
5239 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5240 {
5241         struct rpc_task *task;
5242         struct nfs4_get_lease_time_args args;
5243         struct nfs4_get_lease_time_res res = {
5244                 .lr_fsinfo = fsinfo,
5245         };
5246         struct nfs4_get_lease_time_data data = {
5247                 .args = &args,
5248                 .res = &res,
5249                 .clp = clp,
5250         };
5251         struct rpc_message msg = {
5252                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5253                 .rpc_argp = &args,
5254                 .rpc_resp = &res,
5255         };
5256         struct rpc_task_setup task_setup = {
5257                 .rpc_client = clp->cl_rpcclient,
5258                 .rpc_message = &msg,
5259                 .callback_ops = &nfs4_get_lease_time_ops,
5260                 .callback_data = &data,
5261                 .flags = RPC_TASK_TIMEOUT,
5262         };
5263         int status;
5264
5265         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5266         dprintk("--> %s\n", __func__);
5267         task = rpc_run_task(&task_setup);
5268
5269         if (IS_ERR(task))
5270                 status = PTR_ERR(task);
5271         else {
5272                 status = task->tk_status;
5273                 rpc_put_task(task);
5274         }
5275         dprintk("<-- %s return %d\n", __func__, status);
5276
5277         return status;
5278 }
5279
5280 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5281 {
5282         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5283 }
5284
5285 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5286                 struct nfs4_slot *new,
5287                 u32 max_slots,
5288                 u32 ivalue)
5289 {
5290         struct nfs4_slot *old = NULL;
5291         u32 i;
5292
5293         spin_lock(&tbl->slot_tbl_lock);
5294         if (new) {
5295                 old = tbl->slots;
5296                 tbl->slots = new;
5297                 tbl->max_slots = max_slots;
5298         }
5299         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5300         for (i = 0; i < tbl->max_slots; i++)
5301                 tbl->slots[i].seq_nr = ivalue;
5302         spin_unlock(&tbl->slot_tbl_lock);
5303         kfree(old);
5304 }
5305
5306 /*
5307  * (re)Initialise a slot table
5308  */
5309 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5310                                  u32 ivalue)
5311 {
5312         struct nfs4_slot *new = NULL;
5313         int ret = -ENOMEM;
5314
5315         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5316                 max_reqs, tbl->max_slots);
5317
5318         /* Does the newly negotiated max_reqs match the existing slot table? */
5319         if (max_reqs != tbl->max_slots) {
5320                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5321                 if (!new)
5322                         goto out;
5323         }
5324         ret = 0;
5325
5326         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5327         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5328                 tbl, tbl->slots, tbl->max_slots);
5329 out:
5330         dprintk("<-- %s: return %d\n", __func__, ret);
5331         return ret;
5332 }
5333
5334 /* Destroy the slot table */
5335 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5336 {
5337         if (session->fc_slot_table.slots != NULL) {
5338                 kfree(session->fc_slot_table.slots);
5339                 session->fc_slot_table.slots = NULL;
5340         }
5341         if (session->bc_slot_table.slots != NULL) {
5342                 kfree(session->bc_slot_table.slots);
5343                 session->bc_slot_table.slots = NULL;
5344         }
5345         return;
5346 }
5347
5348 /*
5349  * Initialize or reset the forechannel and backchannel tables
5350  */
5351 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5352 {
5353         struct nfs4_slot_table *tbl;
5354         int status;
5355
5356         dprintk("--> %s\n", __func__);
5357         /* Fore channel */
5358         tbl = &ses->fc_slot_table;
5359         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5360         if (status) /* -ENOMEM */
5361                 return status;
5362         /* Back channel */
5363         tbl = &ses->bc_slot_table;
5364         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5365         if (status && tbl->slots == NULL)
5366                 /* Fore and back channel share a connection so get
5367                  * both slot tables or neither */
5368                 nfs4_destroy_slot_tables(ses);
5369         return status;
5370 }
5371
5372 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5373 {
5374         struct nfs4_session *session;
5375         struct nfs4_slot_table *tbl;
5376
5377         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5378         if (!session)
5379                 return NULL;
5380
5381         tbl = &session->fc_slot_table;
5382         tbl->highest_used_slotid = NFS4_NO_SLOT;
5383         spin_lock_init(&tbl->slot_tbl_lock);
5384         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5385         init_completion(&tbl->complete);
5386
5387         tbl = &session->bc_slot_table;
5388         tbl->highest_used_slotid = NFS4_NO_SLOT;
5389         spin_lock_init(&tbl->slot_tbl_lock);
5390         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5391         init_completion(&tbl->complete);
5392
5393         session->session_state = 1<<NFS4_SESSION_INITING;
5394
5395         session->clp = clp;
5396         return session;
5397 }
5398
5399 void nfs4_destroy_session(struct nfs4_session *session)
5400 {
5401         struct rpc_xprt *xprt;
5402
5403         nfs4_proc_destroy_session(session);
5404
5405         rcu_read_lock();
5406         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5407         rcu_read_unlock();
5408         dprintk("%s Destroy backchannel for xprt %p\n",
5409                 __func__, xprt);
5410         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5411         nfs4_destroy_slot_tables(session);
5412         kfree(session);
5413 }
5414
5415 /*
5416  * Initialize the values to be used by the client in CREATE_SESSION
5417  * If nfs4_init_session set the fore channel request and response sizes,
5418  * use them.
5419  *
5420  * Set the back channel max_resp_sz_cached to zero to force the client to
5421  * always set csa_cachethis to FALSE because the current implementation
5422  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5423  */
5424 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5425 {
5426         struct nfs4_session *session = args->client->cl_session;
5427         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5428                      mxresp_sz = session->fc_attrs.max_resp_sz;
5429
5430         if (mxrqst_sz == 0)
5431                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5432         if (mxresp_sz == 0)
5433                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5434         /* Fore channel attributes */
5435         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5436         args->fc_attrs.max_resp_sz = mxresp_sz;
5437         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5438         args->fc_attrs.max_reqs = max_session_slots;
5439
5440         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5441                 "max_ops=%u max_reqs=%u\n",
5442                 __func__,
5443                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5444                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5445
5446         /* Back channel attributes */
5447         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5448         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5449         args->bc_attrs.max_resp_sz_cached = 0;
5450         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5451         args->bc_attrs.max_reqs = 1;
5452
5453         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5454                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5455                 __func__,
5456                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5457                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5458                 args->bc_attrs.max_reqs);
5459 }
5460
5461 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5462 {
5463         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5464         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5465
5466         if (rcvd->max_resp_sz > sent->max_resp_sz)
5467                 return -EINVAL;
5468         /*
5469          * Our requested max_ops is the minimum we need; we're not
5470          * prepared to break up compounds into smaller pieces than that.
5471          * So, no point even trying to continue if the server won't
5472          * cooperate:
5473          */
5474         if (rcvd->max_ops < sent->max_ops)
5475                 return -EINVAL;
5476         if (rcvd->max_reqs == 0)
5477                 return -EINVAL;
5478         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5479                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5480         return 0;
5481 }
5482
5483 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5484 {
5485         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5486         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5487
5488         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5489                 return -EINVAL;
5490         if (rcvd->max_resp_sz < sent->max_resp_sz)
5491                 return -EINVAL;
5492         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5493                 return -EINVAL;
5494         /* These would render the backchannel useless: */
5495         if (rcvd->max_ops != sent->max_ops)
5496                 return -EINVAL;
5497         if (rcvd->max_reqs != sent->max_reqs)
5498                 return -EINVAL;
5499         return 0;
5500 }
5501
5502 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5503                                      struct nfs4_session *session)
5504 {
5505         int ret;
5506
5507         ret = nfs4_verify_fore_channel_attrs(args, session);
5508         if (ret)
5509                 return ret;
5510         return nfs4_verify_back_channel_attrs(args, session);
5511 }
5512
5513 static int _nfs4_proc_create_session(struct nfs_client *clp)
5514 {
5515         struct nfs4_session *session = clp->cl_session;
5516         struct nfs41_create_session_args args = {
5517                 .client = clp,
5518                 .cb_program = NFS4_CALLBACK,
5519         };
5520         struct nfs41_create_session_res res = {
5521                 .client = clp,
5522         };
5523         struct rpc_message msg = {
5524                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5525                 .rpc_argp = &args,
5526                 .rpc_resp = &res,
5527         };
5528         int status;
5529
5530         nfs4_init_channel_attrs(&args);
5531         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5532
5533         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5534
5535         if (!status)
5536                 /* Verify the session's negotiated channel_attrs values */
5537                 status = nfs4_verify_channel_attrs(&args, session);
5538         if (!status) {
5539                 /* Increment the clientid slot sequence id */
5540                 clp->cl_seqid++;
5541         }
5542
5543         return status;
5544 }
5545
5546 /*
5547  * Issues a CREATE_SESSION operation to the server.
5548  * It is the responsibility of the caller to verify the session is
5549  * expired before calling this routine.
5550  */
5551 int nfs4_proc_create_session(struct nfs_client *clp)
5552 {
5553         int status;
5554         unsigned *ptr;
5555         struct nfs4_session *session = clp->cl_session;
5556
5557         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5558
5559         status = _nfs4_proc_create_session(clp);
5560         if (status)
5561                 goto out;
5562
5563         /* Init or reset the session slot tables */
5564         status = nfs4_setup_session_slot_tables(session);
5565         dprintk("slot table setup returned %d\n", status);
5566         if (status)
5567                 goto out;
5568
5569         ptr = (unsigned *)&session->sess_id.data[0];
5570         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5571                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5572 out:
5573         dprintk("<-- %s\n", __func__);
5574         return status;
5575 }
5576
5577 /*
5578  * Issue the over-the-wire RPC DESTROY_SESSION.
5579  * The caller must serialize access to this routine.
5580  */
5581 int nfs4_proc_destroy_session(struct nfs4_session *session)
5582 {
5583         int status = 0;
5584         struct rpc_message msg;
5585
5586         dprintk("--> nfs4_proc_destroy_session\n");
5587
5588         /* session is still being setup */
5589         if (session->clp->cl_cons_state != NFS_CS_READY)
5590                 return status;
5591
5592         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5593         msg.rpc_argp = session;
5594         msg.rpc_resp = NULL;
5595         msg.rpc_cred = NULL;
5596         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5597
5598         if (status)
5599                 printk(KERN_WARNING
5600                         "NFS: Got error %d from the server on DESTROY_SESSION. "
5601                         "Session has been destroyed regardless...\n", status);
5602
5603         dprintk("<-- nfs4_proc_destroy_session\n");
5604         return status;
5605 }
5606
5607 int nfs4_init_session(struct nfs_server *server)
5608 {
5609         struct nfs_client *clp = server->nfs_client;
5610         struct nfs4_session *session;
5611         unsigned int rsize, wsize;
5612         int ret;
5613
5614         if (!nfs4_has_session(clp))
5615                 return 0;
5616
5617         session = clp->cl_session;
5618         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5619                 return 0;
5620
5621         rsize = server->rsize;
5622         if (rsize == 0)
5623                 rsize = NFS_MAX_FILE_IO_SIZE;
5624         wsize = server->wsize;
5625         if (wsize == 0)
5626                 wsize = NFS_MAX_FILE_IO_SIZE;
5627
5628         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5629         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5630
5631         ret = nfs4_recover_expired_lease(server);
5632         if (!ret)
5633                 ret = nfs4_check_client_ready(clp);
5634         return ret;
5635 }
5636
5637 int nfs4_init_ds_session(struct nfs_client *clp)
5638 {
5639         struct nfs4_session *session = clp->cl_session;
5640         int ret;
5641
5642         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5643                 return 0;
5644
5645         ret = nfs4_client_recover_expired_lease(clp);
5646         if (!ret)
5647                 /* Test for the DS role */
5648                 if (!is_ds_client(clp))
5649                         ret = -ENODEV;
5650         if (!ret)
5651                 ret = nfs4_check_client_ready(clp);
5652         return ret;
5653
5654 }
5655 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5656
5657
5658 /*
5659  * Renew the cl_session lease.
5660  */
5661 struct nfs4_sequence_data {
5662         struct nfs_client *clp;
5663         struct nfs4_sequence_args args;
5664         struct nfs4_sequence_res res;
5665 };
5666
5667 static void nfs41_sequence_release(void *data)
5668 {
5669         struct nfs4_sequence_data *calldata = data;
5670         struct nfs_client *clp = calldata->clp;
5671
5672         if (atomic_read(&clp->cl_count) > 1)
5673                 nfs4_schedule_state_renewal(clp);
5674         nfs_put_client(clp);
5675         kfree(calldata);
5676 }
5677
5678 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5679 {
5680         switch(task->tk_status) {
5681         case -NFS4ERR_DELAY:
5682                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5683                 return -EAGAIN;
5684         default:
5685                 nfs4_schedule_lease_recovery(clp);
5686         }
5687         return 0;
5688 }
5689
5690 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5691 {
5692         struct nfs4_sequence_data *calldata = data;
5693         struct nfs_client *clp = calldata->clp;
5694
5695         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5696                 return;
5697
5698         if (task->tk_status < 0) {
5699                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5700                 if (atomic_read(&clp->cl_count) == 1)
5701                         goto out;
5702
5703                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5704                         rpc_restart_call_prepare(task);
5705                         return;
5706                 }
5707         }
5708         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5709 out:
5710         dprintk("<-- %s\n", __func__);
5711 }
5712
5713 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5714 {
5715         struct nfs4_sequence_data *calldata = data;
5716         struct nfs_client *clp = calldata->clp;
5717         struct nfs4_sequence_args *args;
5718         struct nfs4_sequence_res *res;
5719
5720         args = task->tk_msg.rpc_argp;
5721         res = task->tk_msg.rpc_resp;
5722
5723         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5724                 return;
5725         rpc_call_start(task);
5726 }
5727
5728 static const struct rpc_call_ops nfs41_sequence_ops = {
5729         .rpc_call_done = nfs41_sequence_call_done,
5730         .rpc_call_prepare = nfs41_sequence_prepare,
5731         .rpc_release = nfs41_sequence_release,
5732 };
5733
5734 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5735 {
5736         struct nfs4_sequence_data *calldata;
5737         struct rpc_message msg = {
5738                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5739                 .rpc_cred = cred,
5740         };
5741         struct rpc_task_setup task_setup_data = {
5742                 .rpc_client = clp->cl_rpcclient,
5743                 .rpc_message = &msg,
5744                 .callback_ops = &nfs41_sequence_ops,
5745                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5746         };
5747
5748         if (!atomic_inc_not_zero(&clp->cl_count))
5749                 return ERR_PTR(-EIO);
5750         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5751         if (calldata == NULL) {
5752                 nfs_put_client(clp);
5753                 return ERR_PTR(-ENOMEM);
5754         }
5755         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5756         msg.rpc_argp = &calldata->args;
5757         msg.rpc_resp = &calldata->res;
5758         calldata->clp = clp;
5759         task_setup_data.callback_data = calldata;
5760
5761         return rpc_run_task(&task_setup_data);
5762 }
5763
5764 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5765 {
5766         struct rpc_task *task;
5767         int ret = 0;
5768
5769         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5770                 return 0;
5771         task = _nfs41_proc_sequence(clp, cred);
5772         if (IS_ERR(task))
5773                 ret = PTR_ERR(task);
5774         else
5775                 rpc_put_task_async(task);
5776         dprintk("<-- %s status=%d\n", __func__, ret);
5777         return ret;
5778 }
5779
5780 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5781 {
5782         struct rpc_task *task;
5783         int ret;
5784
5785         task = _nfs41_proc_sequence(clp, cred);
5786         if (IS_ERR(task)) {
5787                 ret = PTR_ERR(task);
5788                 goto out;
5789         }
5790         ret = rpc_wait_for_completion_task(task);
5791         if (!ret) {
5792                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5793
5794                 if (task->tk_status == 0)
5795                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5796                 ret = task->tk_status;
5797         }
5798         rpc_put_task(task);
5799 out:
5800         dprintk("<-- %s status=%d\n", __func__, ret);
5801         return ret;
5802 }
5803
5804 struct nfs4_reclaim_complete_data {
5805         struct nfs_client *clp;
5806         struct nfs41_reclaim_complete_args arg;
5807         struct nfs41_reclaim_complete_res res;
5808 };
5809
5810 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5811 {
5812         struct nfs4_reclaim_complete_data *calldata = data;
5813
5814         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5815         if (nfs41_setup_sequence(calldata->clp->cl_session,
5816                                 &calldata->arg.seq_args,
5817                                 &calldata->res.seq_res, task))
5818                 return;
5819
5820         rpc_call_start(task);
5821 }
5822
5823 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5824 {
5825         switch(task->tk_status) {
5826         case 0:
5827         case -NFS4ERR_COMPLETE_ALREADY:
5828         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5829                 break;
5830         case -NFS4ERR_DELAY:
5831                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5832                 /* fall through */
5833         case -NFS4ERR_RETRY_UNCACHED_REP:
5834                 return -EAGAIN;
5835         default:
5836                 nfs4_schedule_lease_recovery(clp);
5837         }
5838         return 0;
5839 }
5840
5841 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5842 {
5843         struct nfs4_reclaim_complete_data *calldata = data;
5844         struct nfs_client *clp = calldata->clp;
5845         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5846
5847         dprintk("--> %s\n", __func__);
5848         if (!nfs41_sequence_done(task, res))
5849                 return;
5850
5851         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5852                 rpc_restart_call_prepare(task);
5853                 return;
5854         }
5855         dprintk("<-- %s\n", __func__);
5856 }
5857
5858 static void nfs4_free_reclaim_complete_data(void *data)
5859 {
5860         struct nfs4_reclaim_complete_data *calldata = data;
5861
5862         kfree(calldata);
5863 }
5864
5865 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5866         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5867         .rpc_call_done = nfs4_reclaim_complete_done,
5868         .rpc_release = nfs4_free_reclaim_complete_data,
5869 };
5870
5871 /*
5872  * Issue a global reclaim complete.
5873  */
5874 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5875 {
5876         struct nfs4_reclaim_complete_data *calldata;
5877         struct rpc_task *task;
5878         struct rpc_message msg = {
5879                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5880         };
5881         struct rpc_task_setup task_setup_data = {
5882                 .rpc_client = clp->cl_rpcclient,
5883                 .rpc_message = &msg,
5884                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5885                 .flags = RPC_TASK_ASYNC,
5886         };
5887         int status = -ENOMEM;
5888
5889         dprintk("--> %s\n", __func__);
5890         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5891         if (calldata == NULL)
5892                 goto out;
5893         calldata->clp = clp;
5894         calldata->arg.one_fs = 0;
5895
5896         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5897         msg.rpc_argp = &calldata->arg;
5898         msg.rpc_resp = &calldata->res;
5899         task_setup_data.callback_data = calldata;
5900         task = rpc_run_task(&task_setup_data);
5901         if (IS_ERR(task)) {
5902                 status = PTR_ERR(task);
5903                 goto out;
5904         }
5905         status = nfs4_wait_for_completion_rpc_task(task);
5906         if (status == 0)
5907                 status = task->tk_status;
5908         rpc_put_task(task);
5909         return 0;
5910 out:
5911         dprintk("<-- %s status=%d\n", __func__, status);
5912         return status;
5913 }
5914
5915 static void
5916 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5917 {
5918         struct nfs4_layoutget *lgp = calldata;
5919         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5920
5921         dprintk("--> %s\n", __func__);
5922         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5923          * right now covering the LAYOUTGET we are about to send.
5924          * However, that is not so catastrophic, and there seems
5925          * to be no way to prevent it completely.
5926          */
5927         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5928                                 &lgp->res.seq_res, task))
5929                 return;
5930         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5931                                           NFS_I(lgp->args.inode)->layout,
5932                                           lgp->args.ctx->state)) {
5933                 rpc_exit(task, NFS4_OK);
5934                 return;
5935         }
5936         rpc_call_start(task);
5937 }
5938
5939 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5940 {
5941         struct nfs4_layoutget *lgp = calldata;
5942         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5943
5944         dprintk("--> %s\n", __func__);
5945
5946         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5947                 return;
5948
5949         switch (task->tk_status) {
5950         case 0:
5951                 break;
5952         case -NFS4ERR_LAYOUTTRYLATER:
5953         case -NFS4ERR_RECALLCONFLICT:
5954                 task->tk_status = -NFS4ERR_DELAY;
5955                 /* Fall through */
5956         default:
5957                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5958                         rpc_restart_call_prepare(task);
5959                         return;
5960                 }
5961         }
5962         dprintk("<-- %s\n", __func__);
5963 }
5964
5965 static void nfs4_layoutget_release(void *calldata)
5966 {
5967         struct nfs4_layoutget *lgp = calldata;
5968
5969         dprintk("--> %s\n", __func__);
5970         put_nfs_open_context(lgp->args.ctx);
5971         kfree(calldata);
5972         dprintk("<-- %s\n", __func__);
5973 }
5974
5975 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5976         .rpc_call_prepare = nfs4_layoutget_prepare,
5977         .rpc_call_done = nfs4_layoutget_done,
5978         .rpc_release = nfs4_layoutget_release,
5979 };
5980
5981 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5982 {
5983         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5984         struct rpc_task *task;
5985         struct rpc_message msg = {
5986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5987                 .rpc_argp = &lgp->args,
5988                 .rpc_resp = &lgp->res,
5989         };
5990         struct rpc_task_setup task_setup_data = {
5991                 .rpc_client = server->client,
5992                 .rpc_message = &msg,
5993                 .callback_ops = &nfs4_layoutget_call_ops,
5994                 .callback_data = lgp,
5995                 .flags = RPC_TASK_ASYNC,
5996         };
5997         int status = 0;
5998
5999         dprintk("--> %s\n", __func__);
6000
6001         lgp->res.layoutp = &lgp->args.layout;
6002         lgp->res.seq_res.sr_slot = NULL;
6003         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6004         task = rpc_run_task(&task_setup_data);
6005         if (IS_ERR(task))
6006                 return PTR_ERR(task);
6007         status = nfs4_wait_for_completion_rpc_task(task);
6008         if (status == 0)
6009                 status = task->tk_status;
6010         if (status == 0)
6011                 status = pnfs_layout_process(lgp);
6012         rpc_put_task(task);
6013         dprintk("<-- %s status=%d\n", __func__, status);
6014         return status;
6015 }
6016
6017 static void
6018 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6019 {
6020         struct nfs4_layoutreturn *lrp = calldata;
6021
6022         dprintk("--> %s\n", __func__);
6023         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6024                                 &lrp->res.seq_res, task))
6025                 return;
6026         rpc_call_start(task);
6027 }
6028
6029 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6030 {
6031         struct nfs4_layoutreturn *lrp = calldata;
6032         struct nfs_server *server;
6033         struct pnfs_layout_hdr *lo = lrp->args.layout;
6034
6035         dprintk("--> %s\n", __func__);
6036
6037         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6038                 return;
6039
6040         server = NFS_SERVER(lrp->args.inode);
6041         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6042                 rpc_restart_call_prepare(task);
6043                 return;
6044         }
6045         spin_lock(&lo->plh_inode->i_lock);
6046         if (task->tk_status == 0) {
6047                 if (lrp->res.lrs_present) {
6048                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6049                 } else
6050                         BUG_ON(!list_empty(&lo->plh_segs));
6051         }
6052         lo->plh_block_lgets--;
6053         spin_unlock(&lo->plh_inode->i_lock);
6054         dprintk("<-- %s\n", __func__);
6055 }
6056
6057 static void nfs4_layoutreturn_release(void *calldata)
6058 {
6059         struct nfs4_layoutreturn *lrp = calldata;
6060
6061         dprintk("--> %s\n", __func__);
6062         put_layout_hdr(lrp->args.layout);
6063         kfree(calldata);
6064         dprintk("<-- %s\n", __func__);
6065 }
6066
6067 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6068         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6069         .rpc_call_done = nfs4_layoutreturn_done,
6070         .rpc_release = nfs4_layoutreturn_release,
6071 };
6072
6073 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6074 {
6075         struct rpc_task *task;
6076         struct rpc_message msg = {
6077                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6078                 .rpc_argp = &lrp->args,
6079                 .rpc_resp = &lrp->res,
6080         };
6081         struct rpc_task_setup task_setup_data = {
6082                 .rpc_client = lrp->clp->cl_rpcclient,
6083                 .rpc_message = &msg,
6084                 .callback_ops = &nfs4_layoutreturn_call_ops,
6085                 .callback_data = lrp,
6086         };
6087         int status;
6088
6089         dprintk("--> %s\n", __func__);
6090         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6091         task = rpc_run_task(&task_setup_data);
6092         if (IS_ERR(task))
6093                 return PTR_ERR(task);
6094         status = task->tk_status;
6095         dprintk("<-- %s status=%d\n", __func__, status);
6096         rpc_put_task(task);
6097         return status;
6098 }
6099
6100 /*
6101  * Retrieve the list of Data Server devices from the MDS.
6102  */
6103 static int _nfs4_getdevicelist(struct nfs_server *server,
6104                                     const struct nfs_fh *fh,
6105                                     struct pnfs_devicelist *devlist)
6106 {
6107         struct nfs4_getdevicelist_args args = {
6108                 .fh = fh,
6109                 .layoutclass = server->pnfs_curr_ld->id,
6110         };
6111         struct nfs4_getdevicelist_res res = {
6112                 .devlist = devlist,
6113         };
6114         struct rpc_message msg = {
6115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6116                 .rpc_argp = &args,
6117                 .rpc_resp = &res,
6118         };
6119         int status;
6120
6121         dprintk("--> %s\n", __func__);
6122         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6123                                 &res.seq_res, 0);
6124         dprintk("<-- %s status=%d\n", __func__, status);
6125         return status;
6126 }
6127
6128 int nfs4_proc_getdevicelist(struct nfs_server *server,
6129                             const struct nfs_fh *fh,
6130                             struct pnfs_devicelist *devlist)
6131 {
6132         struct nfs4_exception exception = { };
6133         int err;
6134
6135         do {
6136                 err = nfs4_handle_exception(server,
6137                                 _nfs4_getdevicelist(server, fh, devlist),
6138                                 &exception);
6139         } while (exception.retry);
6140
6141         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6142                 err, devlist->num_devs);
6143
6144         return err;
6145 }
6146 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6147
6148 static int
6149 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6150 {
6151         struct nfs4_getdeviceinfo_args args = {
6152                 .pdev = pdev,
6153         };
6154         struct nfs4_getdeviceinfo_res res = {
6155                 .pdev = pdev,
6156         };
6157         struct rpc_message msg = {
6158                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6159                 .rpc_argp = &args,
6160                 .rpc_resp = &res,
6161         };
6162         int status;
6163
6164         dprintk("--> %s\n", __func__);
6165         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6166         dprintk("<-- %s status=%d\n", __func__, status);
6167
6168         return status;
6169 }
6170
6171 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6172 {
6173         struct nfs4_exception exception = { };
6174         int err;
6175
6176         do {
6177                 err = nfs4_handle_exception(server,
6178                                         _nfs4_proc_getdeviceinfo(server, pdev),
6179                                         &exception);
6180         } while (exception.retry);
6181         return err;
6182 }
6183 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6184
6185 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6186 {
6187         struct nfs4_layoutcommit_data *data = calldata;
6188         struct nfs_server *server = NFS_SERVER(data->args.inode);
6189
6190         if (nfs4_setup_sequence(server, &data->args.seq_args,
6191                                 &data->res.seq_res, task))
6192                 return;
6193         rpc_call_start(task);
6194 }
6195
6196 static void
6197 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6198 {
6199         struct nfs4_layoutcommit_data *data = calldata;
6200         struct nfs_server *server = NFS_SERVER(data->args.inode);
6201
6202         if (!nfs4_sequence_done(task, &data->res.seq_res))
6203                 return;
6204
6205         switch (task->tk_status) { /* Just ignore these failures */
6206         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6207         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6208         case -NFS4ERR_BADLAYOUT:     /* no layout */
6209         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6210                 task->tk_status = 0;
6211                 break;
6212         case 0:
6213                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6214                                                    data->res.fattr);
6215                 break;
6216         default:
6217                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6218                         rpc_restart_call_prepare(task);
6219                         return;
6220                 }
6221         }
6222 }
6223
6224 static void nfs4_layoutcommit_release(void *calldata)
6225 {
6226         struct nfs4_layoutcommit_data *data = calldata;
6227         struct pnfs_layout_segment *lseg, *tmp;
6228         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6229
6230         pnfs_cleanup_layoutcommit(data);
6231         /* Matched by references in pnfs_set_layoutcommit */
6232         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6233                 list_del_init(&lseg->pls_lc_list);
6234                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6235                                        &lseg->pls_flags))
6236                         put_lseg(lseg);
6237         }
6238
6239         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6240         smp_mb__after_clear_bit();
6241         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6242
6243         put_rpccred(data->cred);
6244         kfree(data);
6245 }
6246
6247 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6248         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6249         .rpc_call_done = nfs4_layoutcommit_done,
6250         .rpc_release = nfs4_layoutcommit_release,
6251 };
6252
6253 int
6254 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6255 {
6256         struct rpc_message msg = {
6257                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6258                 .rpc_argp = &data->args,
6259                 .rpc_resp = &data->res,
6260                 .rpc_cred = data->cred,
6261         };
6262         struct rpc_task_setup task_setup_data = {
6263                 .task = &data->task,
6264                 .rpc_client = NFS_CLIENT(data->args.inode),
6265                 .rpc_message = &msg,
6266                 .callback_ops = &nfs4_layoutcommit_ops,
6267                 .callback_data = data,
6268                 .flags = RPC_TASK_ASYNC,
6269         };
6270         struct rpc_task *task;
6271         int status = 0;
6272
6273         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6274                 "lbw: %llu inode %lu\n",
6275                 data->task.tk_pid, sync,
6276                 data->args.lastbytewritten,
6277                 data->args.inode->i_ino);
6278
6279         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6280         task = rpc_run_task(&task_setup_data);
6281         if (IS_ERR(task))
6282                 return PTR_ERR(task);
6283         if (sync == false)
6284                 goto out;
6285         status = nfs4_wait_for_completion_rpc_task(task);
6286         if (status != 0)
6287                 goto out;
6288         status = task->tk_status;
6289 out:
6290         dprintk("%s: status %d\n", __func__, status);
6291         rpc_put_task(task);
6292         return status;
6293 }
6294
6295 static int
6296 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6297                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6298 {
6299         struct nfs41_secinfo_no_name_args args = {
6300                 .style = SECINFO_STYLE_CURRENT_FH,
6301         };
6302         struct nfs4_secinfo_res res = {
6303                 .flavors = flavors,
6304         };
6305         struct rpc_message msg = {
6306                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6307                 .rpc_argp = &args,
6308                 .rpc_resp = &res,
6309         };
6310         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6311 }
6312
6313 static int
6314 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6315                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6316 {
6317         struct nfs4_exception exception = { };
6318         int err;
6319         do {
6320                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6321                 switch (err) {
6322                 case 0:
6323                 case -NFS4ERR_WRONGSEC:
6324                 case -NFS4ERR_NOTSUPP:
6325                         goto out;
6326                 default:
6327                         err = nfs4_handle_exception(server, err, &exception);
6328                 }
6329         } while (exception.retry);
6330 out:
6331         return err;
6332 }
6333
6334 static int
6335 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6336                     struct nfs_fsinfo *info)
6337 {
6338         int err;
6339         struct page *page;
6340         rpc_authflavor_t flavor;
6341         struct nfs4_secinfo_flavors *flavors;
6342
6343         page = alloc_page(GFP_KERNEL);
6344         if (!page) {
6345                 err = -ENOMEM;
6346                 goto out;
6347         }
6348
6349         flavors = page_address(page);
6350         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6351
6352         /*
6353          * Fall back on "guess and check" method if
6354          * the server doesn't support SECINFO_NO_NAME
6355          */
6356         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6357                 err = nfs4_find_root_sec(server, fhandle, info);
6358                 goto out_freepage;
6359         }
6360         if (err)
6361                 goto out_freepage;
6362
6363         flavor = nfs_find_best_sec(flavors);
6364         if (err == 0)
6365                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6366
6367 out_freepage:
6368         put_page(page);
6369         if (err == -EACCES)
6370                 return -EPERM;
6371 out:
6372         return err;
6373 }
6374
6375 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6376 {
6377         int status;
6378         struct nfs41_test_stateid_args args = {
6379                 .stateid = stateid,
6380         };
6381         struct nfs41_test_stateid_res res;
6382         struct rpc_message msg = {
6383                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6384                 .rpc_argp = &args,
6385                 .rpc_resp = &res,
6386         };
6387
6388         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6389         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6390
6391         if (status == NFS_OK)
6392                 return res.status;
6393         return status;
6394 }
6395
6396 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6397 {
6398         struct nfs4_exception exception = { };
6399         int err;
6400         do {
6401                 err = nfs4_handle_exception(server,
6402                                 _nfs41_test_stateid(server, stateid),
6403                                 &exception);
6404         } while (exception.retry);
6405         return err;
6406 }
6407
6408 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6409 {
6410         struct nfs41_free_stateid_args args = {
6411                 .stateid = stateid,
6412         };
6413         struct nfs41_free_stateid_res res;
6414         struct rpc_message msg = {
6415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6416                 .rpc_argp = &args,
6417                 .rpc_resp = &res,
6418         };
6419
6420         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6421         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6422 }
6423
6424 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6425 {
6426         struct nfs4_exception exception = { };
6427         int err;
6428         do {
6429                 err = nfs4_handle_exception(server,
6430                                 _nfs4_free_stateid(server, stateid),
6431                                 &exception);
6432         } while (exception.retry);
6433         return err;
6434 }
6435
6436 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6437                 const nfs4_stateid *s2)
6438 {
6439         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6440                 return false;
6441
6442         if (s1->seqid == s2->seqid)
6443                 return true;
6444         if (s1->seqid == 0 || s2->seqid == 0)
6445                 return true;
6446
6447         return false;
6448 }
6449
6450 #endif /* CONFIG_NFS_V4_1 */
6451
6452 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6453                 const nfs4_stateid *s2)
6454 {
6455         return nfs4_stateid_match(s1, s2);
6456 }
6457
6458
6459 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6460         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6461         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6462         .recover_open   = nfs4_open_reclaim,
6463         .recover_lock   = nfs4_lock_reclaim,
6464         .establish_clid = nfs4_init_clientid,
6465         .get_clid_cred  = nfs4_get_setclientid_cred,
6466 };
6467
6468 #if defined(CONFIG_NFS_V4_1)
6469 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6470         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6471         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6472         .recover_open   = nfs4_open_reclaim,
6473         .recover_lock   = nfs4_lock_reclaim,
6474         .establish_clid = nfs41_init_clientid,
6475         .get_clid_cred  = nfs4_get_exchange_id_cred,
6476         .reclaim_complete = nfs41_proc_reclaim_complete,
6477 };
6478 #endif /* CONFIG_NFS_V4_1 */
6479
6480 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6481         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6482         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6483         .recover_open   = nfs4_open_expired,
6484         .recover_lock   = nfs4_lock_expired,
6485         .establish_clid = nfs4_init_clientid,
6486         .get_clid_cred  = nfs4_get_setclientid_cred,
6487 };
6488
6489 #if defined(CONFIG_NFS_V4_1)
6490 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6491         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6492         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6493         .recover_open   = nfs41_open_expired,
6494         .recover_lock   = nfs41_lock_expired,
6495         .establish_clid = nfs41_init_clientid,
6496         .get_clid_cred  = nfs4_get_exchange_id_cred,
6497 };
6498 #endif /* CONFIG_NFS_V4_1 */
6499
6500 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6501         .sched_state_renewal = nfs4_proc_async_renew,
6502         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6503         .renew_lease = nfs4_proc_renew,
6504 };
6505
6506 #if defined(CONFIG_NFS_V4_1)
6507 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6508         .sched_state_renewal = nfs41_proc_async_sequence,
6509         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6510         .renew_lease = nfs4_proc_sequence,
6511 };
6512 #endif
6513
6514 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6515         .minor_version = 0,
6516         .call_sync = _nfs4_call_sync,
6517         .match_stateid = nfs4_match_stateid,
6518         .find_root_sec = nfs4_find_root_sec,
6519         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6520         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6521         .state_renewal_ops = &nfs40_state_renewal_ops,
6522 };
6523
6524 #if defined(CONFIG_NFS_V4_1)
6525 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6526         .minor_version = 1,
6527         .call_sync = _nfs4_call_sync_session,
6528         .match_stateid = nfs41_match_stateid,
6529         .find_root_sec = nfs41_find_root_sec,
6530         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6531         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6532         .state_renewal_ops = &nfs41_state_renewal_ops,
6533 };
6534 #endif
6535
6536 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6537         [0] = &nfs_v4_0_minor_ops,
6538 #if defined(CONFIG_NFS_V4_1)
6539         [1] = &nfs_v4_1_minor_ops,
6540 #endif
6541 };
6542
6543 static const struct inode_operations nfs4_file_inode_operations = {
6544         .permission     = nfs_permission,
6545         .getattr        = nfs_getattr,
6546         .setattr        = nfs_setattr,
6547         .getxattr       = generic_getxattr,
6548         .setxattr       = generic_setxattr,
6549         .listxattr      = generic_listxattr,
6550         .removexattr    = generic_removexattr,
6551 };
6552
6553 const struct nfs_rpc_ops nfs_v4_clientops = {
6554         .version        = 4,                    /* protocol version */
6555         .dentry_ops     = &nfs4_dentry_operations,
6556         .dir_inode_ops  = &nfs4_dir_inode_operations,
6557         .file_inode_ops = &nfs4_file_inode_operations,
6558         .file_ops       = &nfs4_file_operations,
6559         .getroot        = nfs4_proc_get_root,
6560         .getattr        = nfs4_proc_getattr,
6561         .setattr        = nfs4_proc_setattr,
6562         .lookup         = nfs4_proc_lookup,
6563         .access         = nfs4_proc_access,
6564         .readlink       = nfs4_proc_readlink,
6565         .create         = nfs4_proc_create,
6566         .remove         = nfs4_proc_remove,
6567         .unlink_setup   = nfs4_proc_unlink_setup,
6568         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6569         .unlink_done    = nfs4_proc_unlink_done,
6570         .rename         = nfs4_proc_rename,
6571         .rename_setup   = nfs4_proc_rename_setup,
6572         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6573         .rename_done    = nfs4_proc_rename_done,
6574         .link           = nfs4_proc_link,
6575         .symlink        = nfs4_proc_symlink,
6576         .mkdir          = nfs4_proc_mkdir,
6577         .rmdir          = nfs4_proc_remove,
6578         .readdir        = nfs4_proc_readdir,
6579         .mknod          = nfs4_proc_mknod,
6580         .statfs         = nfs4_proc_statfs,
6581         .fsinfo         = nfs4_proc_fsinfo,
6582         .pathconf       = nfs4_proc_pathconf,
6583         .set_capabilities = nfs4_server_capabilities,
6584         .decode_dirent  = nfs4_decode_dirent,
6585         .read_setup     = nfs4_proc_read_setup,
6586         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6587         .read_done      = nfs4_read_done,
6588         .write_setup    = nfs4_proc_write_setup,
6589         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6590         .write_done     = nfs4_write_done,
6591         .commit_setup   = nfs4_proc_commit_setup,
6592         .commit_done    = nfs4_commit_done,
6593         .lock           = nfs4_proc_lock,
6594         .clear_acl_cache = nfs4_zap_acl_attr,
6595         .close_context  = nfs4_close_context,
6596         .open_context   = nfs4_atomic_open,
6597         .init_client    = nfs4_init_client,
6598         .secinfo        = nfs4_proc_secinfo,
6599 };
6600
6601 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6602         .prefix = XATTR_NAME_NFSV4_ACL,
6603         .list   = nfs4_xattr_list_nfs4_acl,
6604         .get    = nfs4_xattr_get_nfs4_acl,
6605         .set    = nfs4_xattr_set_nfs4_acl,
6606 };
6607
6608 const struct xattr_handler *nfs4_xattr_handlers[] = {
6609         &nfs4_xattr_nfs4_acl_handler,
6610         NULL
6611 };
6612
6613 module_param(max_session_slots, ushort, 0644);
6614 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6615                 "requests the client will negotiate");
6616
6617 /*
6618  * Local variables:
6619  *  c-basic-offset: 8
6620  * End:
6621  */