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.len = name->len,
2786                 .name.name = name->name,
2787                 .bitmask = server->attr_bitmask,
2788         };
2789         struct nfs_removeres res = {
2790                 .server = server,
2791         };
2792         struct rpc_message msg = {
2793                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2794                 .rpc_argp = &args,
2795                 .rpc_resp = &res,
2796         };
2797         int status = -ENOMEM;
2798
2799         res.dir_attr = nfs_alloc_fattr();
2800         if (res.dir_attr == NULL)
2801                 goto out;
2802
2803         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2804         if (status == 0) {
2805                 update_changeattr(dir, &res.cinfo);
2806                 nfs_post_op_update_inode(dir, res.dir_attr);
2807         }
2808         nfs_free_fattr(res.dir_attr);
2809 out:
2810         return status;
2811 }
2812
2813 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2814 {
2815         struct nfs4_exception exception = { };
2816         int err;
2817         do {
2818                 err = nfs4_handle_exception(NFS_SERVER(dir),
2819                                 _nfs4_proc_remove(dir, name),
2820                                 &exception);
2821         } while (exception.retry);
2822         return err;
2823 }
2824
2825 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2826 {
2827         struct nfs_server *server = NFS_SERVER(dir);
2828         struct nfs_removeargs *args = msg->rpc_argp;
2829         struct nfs_removeres *res = msg->rpc_resp;
2830
2831         args->bitmask = server->cache_consistency_bitmask;
2832         res->server = server;
2833         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2834         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2835 }
2836
2837 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2838 {
2839         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2840                                 &data->args.seq_args,
2841                                 &data->res.seq_res,
2842                                 task))
2843                 return;
2844         rpc_call_start(task);
2845 }
2846
2847 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2848 {
2849         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2850
2851         if (!nfs4_sequence_done(task, &res->seq_res))
2852                 return 0;
2853         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2854                 return 0;
2855         update_changeattr(dir, &res->cinfo);
2856         nfs_post_op_update_inode(dir, res->dir_attr);
2857         return 1;
2858 }
2859
2860 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2861 {
2862         struct nfs_server *server = NFS_SERVER(dir);
2863         struct nfs_renameargs *arg = msg->rpc_argp;
2864         struct nfs_renameres *res = msg->rpc_resp;
2865
2866         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2867         arg->bitmask = server->attr_bitmask;
2868         res->server = server;
2869         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2870 }
2871
2872 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2873 {
2874         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2875                                 &data->args.seq_args,
2876                                 &data->res.seq_res,
2877                                 task))
2878                 return;
2879         rpc_call_start(task);
2880 }
2881
2882 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2883                                  struct inode *new_dir)
2884 {
2885         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2886
2887         if (!nfs4_sequence_done(task, &res->seq_res))
2888                 return 0;
2889         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2890                 return 0;
2891
2892         update_changeattr(old_dir, &res->old_cinfo);
2893         nfs_post_op_update_inode(old_dir, res->old_fattr);
2894         update_changeattr(new_dir, &res->new_cinfo);
2895         nfs_post_op_update_inode(new_dir, res->new_fattr);
2896         return 1;
2897 }
2898
2899 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2900                 struct inode *new_dir, struct qstr *new_name)
2901 {
2902         struct nfs_server *server = NFS_SERVER(old_dir);
2903         struct nfs_renameargs arg = {
2904                 .old_dir = NFS_FH(old_dir),
2905                 .new_dir = NFS_FH(new_dir),
2906                 .old_name = old_name,
2907                 .new_name = new_name,
2908                 .bitmask = server->attr_bitmask,
2909         };
2910         struct nfs_renameres res = {
2911                 .server = server,
2912         };
2913         struct rpc_message msg = {
2914                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2915                 .rpc_argp = &arg,
2916                 .rpc_resp = &res,
2917         };
2918         int status = -ENOMEM;
2919
2920         res.old_fattr = nfs_alloc_fattr();
2921         res.new_fattr = nfs_alloc_fattr();
2922         if (res.old_fattr == NULL || res.new_fattr == NULL)
2923                 goto out;
2924
2925         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2926         if (!status) {
2927                 update_changeattr(old_dir, &res.old_cinfo);
2928                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2929                 update_changeattr(new_dir, &res.new_cinfo);
2930                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2931         }
2932 out:
2933         nfs_free_fattr(res.new_fattr);
2934         nfs_free_fattr(res.old_fattr);
2935         return status;
2936 }
2937
2938 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2939                 struct inode *new_dir, struct qstr *new_name)
2940 {
2941         struct nfs4_exception exception = { };
2942         int err;
2943         do {
2944                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2945                                 _nfs4_proc_rename(old_dir, old_name,
2946                                         new_dir, new_name),
2947                                 &exception);
2948         } while (exception.retry);
2949         return err;
2950 }
2951
2952 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2953 {
2954         struct nfs_server *server = NFS_SERVER(inode);
2955         struct nfs4_link_arg arg = {
2956                 .fh     = NFS_FH(inode),
2957                 .dir_fh = NFS_FH(dir),
2958                 .name   = name,
2959                 .bitmask = server->attr_bitmask,
2960         };
2961         struct nfs4_link_res res = {
2962                 .server = server,
2963         };
2964         struct rpc_message msg = {
2965                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2966                 .rpc_argp = &arg,
2967                 .rpc_resp = &res,
2968         };
2969         int status = -ENOMEM;
2970
2971         res.fattr = nfs_alloc_fattr();
2972         res.dir_attr = nfs_alloc_fattr();
2973         if (res.fattr == NULL || res.dir_attr == NULL)
2974                 goto out;
2975
2976         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2977         if (!status) {
2978                 update_changeattr(dir, &res.cinfo);
2979                 nfs_post_op_update_inode(dir, res.dir_attr);
2980                 nfs_post_op_update_inode(inode, res.fattr);
2981         }
2982 out:
2983         nfs_free_fattr(res.dir_attr);
2984         nfs_free_fattr(res.fattr);
2985         return status;
2986 }
2987
2988 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2989 {
2990         struct nfs4_exception exception = { };
2991         int err;
2992         do {
2993                 err = nfs4_handle_exception(NFS_SERVER(inode),
2994                                 _nfs4_proc_link(inode, dir, name),
2995                                 &exception);
2996         } while (exception.retry);
2997         return err;
2998 }
2999
3000 struct nfs4_createdata {
3001         struct rpc_message msg;
3002         struct nfs4_create_arg arg;
3003         struct nfs4_create_res res;
3004         struct nfs_fh fh;
3005         struct nfs_fattr fattr;
3006         struct nfs_fattr dir_fattr;
3007 };
3008
3009 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3010                 struct qstr *name, struct iattr *sattr, u32 ftype)
3011 {
3012         struct nfs4_createdata *data;
3013
3014         data = kzalloc(sizeof(*data), GFP_KERNEL);
3015         if (data != NULL) {
3016                 struct nfs_server *server = NFS_SERVER(dir);
3017
3018                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3019                 data->msg.rpc_argp = &data->arg;
3020                 data->msg.rpc_resp = &data->res;
3021                 data->arg.dir_fh = NFS_FH(dir);
3022                 data->arg.server = server;
3023                 data->arg.name = name;
3024                 data->arg.attrs = sattr;
3025                 data->arg.ftype = ftype;
3026                 data->arg.bitmask = server->attr_bitmask;
3027                 data->res.server = server;
3028                 data->res.fh = &data->fh;
3029                 data->res.fattr = &data->fattr;
3030                 data->res.dir_fattr = &data->dir_fattr;
3031                 nfs_fattr_init(data->res.fattr);
3032                 nfs_fattr_init(data->res.dir_fattr);
3033         }
3034         return data;
3035 }
3036
3037 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3038 {
3039         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3040                                     &data->arg.seq_args, &data->res.seq_res, 1);
3041         if (status == 0) {
3042                 update_changeattr(dir, &data->res.dir_cinfo);
3043                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
3044                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3045         }
3046         return status;
3047 }
3048
3049 static void nfs4_free_createdata(struct nfs4_createdata *data)
3050 {
3051         kfree(data);
3052 }
3053
3054 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3055                 struct page *page, unsigned int len, struct iattr *sattr)
3056 {
3057         struct nfs4_createdata *data;
3058         int status = -ENAMETOOLONG;
3059
3060         if (len > NFS4_MAXPATHLEN)
3061                 goto out;
3062
3063         status = -ENOMEM;
3064         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3065         if (data == NULL)
3066                 goto out;
3067
3068         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3069         data->arg.u.symlink.pages = &page;
3070         data->arg.u.symlink.len = len;
3071
3072         status = nfs4_do_create(dir, dentry, data);
3073
3074         nfs4_free_createdata(data);
3075 out:
3076         return status;
3077 }
3078
3079 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3080                 struct page *page, unsigned int len, struct iattr *sattr)
3081 {
3082         struct nfs4_exception exception = { };
3083         int err;
3084         do {
3085                 err = nfs4_handle_exception(NFS_SERVER(dir),
3086                                 _nfs4_proc_symlink(dir, dentry, page,
3087                                                         len, sattr),
3088                                 &exception);
3089         } while (exception.retry);
3090         return err;
3091 }
3092
3093 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3094                 struct iattr *sattr)
3095 {
3096         struct nfs4_createdata *data;
3097         int status = -ENOMEM;
3098
3099         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3100         if (data == NULL)
3101                 goto out;
3102
3103         status = nfs4_do_create(dir, dentry, data);
3104
3105         nfs4_free_createdata(data);
3106 out:
3107         return status;
3108 }
3109
3110 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3111                 struct iattr *sattr)
3112 {
3113         struct nfs4_exception exception = { };
3114         int err;
3115
3116         sattr->ia_mode &= ~current_umask();
3117         do {
3118                 err = nfs4_handle_exception(NFS_SERVER(dir),
3119                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3120                                 &exception);
3121         } while (exception.retry);
3122         return err;
3123 }
3124
3125 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3126                 u64 cookie, struct page **pages, unsigned int count, int plus)
3127 {
3128         struct inode            *dir = dentry->d_inode;
3129         struct nfs4_readdir_arg args = {
3130                 .fh = NFS_FH(dir),
3131                 .pages = pages,
3132                 .pgbase = 0,
3133                 .count = count,
3134                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3135                 .plus = plus,
3136         };
3137         struct nfs4_readdir_res res;
3138         struct rpc_message msg = {
3139                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3140                 .rpc_argp = &args,
3141                 .rpc_resp = &res,
3142                 .rpc_cred = cred,
3143         };
3144         int                     status;
3145
3146         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3147                         dentry->d_parent->d_name.name,
3148                         dentry->d_name.name,
3149                         (unsigned long long)cookie);
3150         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3151         res.pgbase = args.pgbase;
3152         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3153         if (status >= 0) {
3154                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3155                 status += args.pgbase;
3156         }
3157
3158         nfs_invalidate_atime(dir);
3159
3160         dprintk("%s: returns %d\n", __func__, status);
3161         return status;
3162 }
3163
3164 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3165                 u64 cookie, struct page **pages, unsigned int count, int plus)
3166 {
3167         struct nfs4_exception exception = { };
3168         int err;
3169         do {
3170                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3171                                 _nfs4_proc_readdir(dentry, cred, cookie,
3172                                         pages, count, plus),
3173                                 &exception);
3174         } while (exception.retry);
3175         return err;
3176 }
3177
3178 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3179                 struct iattr *sattr, dev_t rdev)
3180 {
3181         struct nfs4_createdata *data;
3182         int mode = sattr->ia_mode;
3183         int status = -ENOMEM;
3184
3185         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3186         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3187
3188         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3189         if (data == NULL)
3190                 goto out;
3191
3192         if (S_ISFIFO(mode))
3193                 data->arg.ftype = NF4FIFO;
3194         else if (S_ISBLK(mode)) {
3195                 data->arg.ftype = NF4BLK;
3196                 data->arg.u.device.specdata1 = MAJOR(rdev);
3197                 data->arg.u.device.specdata2 = MINOR(rdev);
3198         }
3199         else if (S_ISCHR(mode)) {
3200                 data->arg.ftype = NF4CHR;
3201                 data->arg.u.device.specdata1 = MAJOR(rdev);
3202                 data->arg.u.device.specdata2 = MINOR(rdev);
3203         }
3204
3205         status = nfs4_do_create(dir, dentry, data);
3206
3207         nfs4_free_createdata(data);
3208 out:
3209         return status;
3210 }
3211
3212 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3213                 struct iattr *sattr, dev_t rdev)
3214 {
3215         struct nfs4_exception exception = { };
3216         int err;
3217
3218         sattr->ia_mode &= ~current_umask();
3219         do {
3220                 err = nfs4_handle_exception(NFS_SERVER(dir),
3221                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3222                                 &exception);
3223         } while (exception.retry);
3224         return err;
3225 }
3226
3227 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3228                  struct nfs_fsstat *fsstat)
3229 {
3230         struct nfs4_statfs_arg args = {
3231                 .fh = fhandle,
3232                 .bitmask = server->attr_bitmask,
3233         };
3234         struct nfs4_statfs_res res = {
3235                 .fsstat = fsstat,
3236         };
3237         struct rpc_message msg = {
3238                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3239                 .rpc_argp = &args,
3240                 .rpc_resp = &res,
3241         };
3242
3243         nfs_fattr_init(fsstat->fattr);
3244         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3245 }
3246
3247 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3248 {
3249         struct nfs4_exception exception = { };
3250         int err;
3251         do {
3252                 err = nfs4_handle_exception(server,
3253                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3254                                 &exception);
3255         } while (exception.retry);
3256         return err;
3257 }
3258
3259 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3260                 struct nfs_fsinfo *fsinfo)
3261 {
3262         struct nfs4_fsinfo_arg args = {
3263                 .fh = fhandle,
3264                 .bitmask = server->attr_bitmask,
3265         };
3266         struct nfs4_fsinfo_res res = {
3267                 .fsinfo = fsinfo,
3268         };
3269         struct rpc_message msg = {
3270                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3271                 .rpc_argp = &args,
3272                 .rpc_resp = &res,
3273         };
3274
3275         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3276 }
3277
3278 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3279 {
3280         struct nfs4_exception exception = { };
3281         int err;
3282
3283         do {
3284                 err = nfs4_handle_exception(server,
3285                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3286                                 &exception);
3287         } while (exception.retry);
3288         return err;
3289 }
3290
3291 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3292 {
3293         nfs_fattr_init(fsinfo->fattr);
3294         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3295 }
3296
3297 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3298                 struct nfs_pathconf *pathconf)
3299 {
3300         struct nfs4_pathconf_arg args = {
3301                 .fh = fhandle,
3302                 .bitmask = server->attr_bitmask,
3303         };
3304         struct nfs4_pathconf_res res = {
3305                 .pathconf = pathconf,
3306         };
3307         struct rpc_message msg = {
3308                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3309                 .rpc_argp = &args,
3310                 .rpc_resp = &res,
3311         };
3312
3313         /* None of the pathconf attributes are mandatory to implement */
3314         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3315                 memset(pathconf, 0, sizeof(*pathconf));
3316                 return 0;
3317         }
3318
3319         nfs_fattr_init(pathconf->fattr);
3320         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3321 }
3322
3323 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3324                 struct nfs_pathconf *pathconf)
3325 {
3326         struct nfs4_exception exception = { };
3327         int err;
3328
3329         do {
3330                 err = nfs4_handle_exception(server,
3331                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3332                                 &exception);
3333         } while (exception.retry);
3334         return err;
3335 }
3336
3337 void __nfs4_read_done_cb(struct nfs_read_data *data)
3338 {
3339         nfs_invalidate_atime(data->header->inode);
3340 }
3341
3342 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3343 {
3344         struct nfs_server *server = NFS_SERVER(data->header->inode);
3345
3346         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3347                 rpc_restart_call_prepare(task);
3348                 return -EAGAIN;
3349         }
3350
3351         __nfs4_read_done_cb(data);
3352         if (task->tk_status > 0)
3353                 renew_lease(server, data->timestamp);
3354         return 0;
3355 }
3356
3357 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3358 {
3359
3360         dprintk("--> %s\n", __func__);
3361
3362         if (!nfs4_sequence_done(task, &data->res.seq_res))
3363                 return -EAGAIN;
3364
3365         return data->read_done_cb ? data->read_done_cb(task, data) :
3366                                     nfs4_read_done_cb(task, data);
3367 }
3368
3369 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3370 {
3371         data->timestamp   = jiffies;
3372         data->read_done_cb = nfs4_read_done_cb;
3373         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3374         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3375 }
3376
3377 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3378 {
3379         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3380                                 &data->args.seq_args,
3381                                 &data->res.seq_res,
3382                                 task))
3383                 return;
3384         rpc_call_start(task);
3385 }
3386
3387 /* Reset the the nfs_read_data to send the read to the MDS. */
3388 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3389 {
3390         struct nfs_pgio_header *hdr = data->header;
3391         struct inode *inode = hdr->inode;
3392
3393         dprintk("%s Reset task for i/o through\n", __func__);
3394         data->ds_clp = NULL;
3395         /* offsets will differ in the dense stripe case */
3396         data->args.offset = data->mds_offset;
3397         data->args.fh     = NFS_FH(inode);
3398         data->read_done_cb = nfs4_read_done_cb;
3399         task->tk_ops = hdr->mds_ops;
3400         rpc_task_reset_client(task, NFS_CLIENT(inode));
3401 }
3402 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3403
3404 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3405 {
3406         struct inode *inode = data->header->inode;
3407
3408         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3409                 rpc_restart_call_prepare(task);
3410                 return -EAGAIN;
3411         }
3412         if (task->tk_status >= 0) {
3413                 renew_lease(NFS_SERVER(inode), data->timestamp);
3414                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3415         }
3416         return 0;
3417 }
3418
3419 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3420 {
3421         if (!nfs4_sequence_done(task, &data->res.seq_res))
3422                 return -EAGAIN;
3423         return data->write_done_cb ? data->write_done_cb(task, data) :
3424                 nfs4_write_done_cb(task, data);
3425 }
3426
3427 /* Reset the the nfs_write_data to send the write to the MDS. */
3428 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3429 {
3430         struct nfs_pgio_header *hdr = data->header;
3431         struct inode *inode = hdr->inode;
3432
3433         dprintk("%s Reset task for i/o through\n", __func__);
3434         data->ds_clp     = NULL;
3435         data->write_done_cb = nfs4_write_done_cb;
3436         data->args.fh       = NFS_FH(inode);
3437         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3438         data->args.offset   = data->mds_offset;
3439         data->res.fattr     = &data->fattr;
3440         task->tk_ops        = hdr->mds_ops;
3441         rpc_task_reset_client(task, NFS_CLIENT(inode));
3442 }
3443 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3444
3445 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3446 {
3447         struct nfs_server *server = NFS_SERVER(data->header->inode);
3448
3449         if (data->ds_clp) {
3450                 data->args.bitmask = NULL;
3451                 data->res.fattr = NULL;
3452         } else
3453                 data->args.bitmask = server->cache_consistency_bitmask;
3454         if (!data->write_done_cb)
3455                 data->write_done_cb = nfs4_write_done_cb;
3456         data->res.server = server;
3457         data->timestamp   = jiffies;
3458
3459         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3460         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3461 }
3462
3463 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3464 {
3465         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3466                                 &data->args.seq_args,
3467                                 &data->res.seq_res,
3468                                 task))
3469                 return;
3470         rpc_call_start(task);
3471 }
3472
3473 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3474 {
3475         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3476                                 &data->args.seq_args,
3477                                 &data->res.seq_res,
3478                                 task))
3479                 return;
3480         rpc_call_start(task);
3481 }
3482
3483 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3484 {
3485         struct inode *inode = data->inode;
3486
3487         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3488                 rpc_restart_call_prepare(task);
3489                 return -EAGAIN;
3490         }
3491         nfs_refresh_inode(inode, data->res.fattr);
3492         return 0;
3493 }
3494
3495 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3496 {
3497         if (!nfs4_sequence_done(task, &data->res.seq_res))
3498                 return -EAGAIN;
3499         return data->commit_done_cb(task, data);
3500 }
3501
3502 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3503 {
3504         struct nfs_server *server = NFS_SERVER(data->inode);
3505
3506         if (data->lseg) {
3507                 data->args.bitmask = NULL;
3508                 data->res.fattr = NULL;
3509         } else
3510                 data->args.bitmask = server->cache_consistency_bitmask;
3511         if (data->commit_done_cb == NULL)
3512                 data->commit_done_cb = nfs4_commit_done_cb;
3513         data->res.server = server;
3514         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3515         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3516 }
3517
3518 struct nfs4_renewdata {
3519         struct nfs_client       *client;
3520         unsigned long           timestamp;
3521 };
3522
3523 /*
3524  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3525  * standalone procedure for queueing an asynchronous RENEW.
3526  */
3527 static void nfs4_renew_release(void *calldata)
3528 {
3529         struct nfs4_renewdata *data = calldata;
3530         struct nfs_client *clp = data->client;
3531
3532         if (atomic_read(&clp->cl_count) > 1)
3533                 nfs4_schedule_state_renewal(clp);
3534         nfs_put_client(clp);
3535         kfree(data);
3536 }
3537
3538 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3539 {
3540         struct nfs4_renewdata *data = calldata;
3541         struct nfs_client *clp = data->client;
3542         unsigned long timestamp = data->timestamp;
3543
3544         if (task->tk_status < 0) {
3545                 /* Unless we're shutting down, schedule state recovery! */
3546                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3547                         return;
3548                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3549                         nfs4_schedule_lease_recovery(clp);
3550                         return;
3551                 }
3552                 nfs4_schedule_path_down_recovery(clp);
3553         }
3554         do_renew_lease(clp, timestamp);
3555 }
3556
3557 static const struct rpc_call_ops nfs4_renew_ops = {
3558         .rpc_call_done = nfs4_renew_done,
3559         .rpc_release = nfs4_renew_release,
3560 };
3561
3562 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3563 {
3564         struct rpc_message msg = {
3565                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3566                 .rpc_argp       = clp,
3567                 .rpc_cred       = cred,
3568         };
3569         struct nfs4_renewdata *data;
3570
3571         if (renew_flags == 0)
3572                 return 0;
3573         if (!atomic_inc_not_zero(&clp->cl_count))
3574                 return -EIO;
3575         data = kmalloc(sizeof(*data), GFP_NOFS);
3576         if (data == NULL)
3577                 return -ENOMEM;
3578         data->client = clp;
3579         data->timestamp = jiffies;
3580         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3581                         &nfs4_renew_ops, data);
3582 }
3583
3584 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3585 {
3586         struct rpc_message msg = {
3587                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3588                 .rpc_argp       = clp,
3589                 .rpc_cred       = cred,
3590         };
3591         unsigned long now = jiffies;
3592         int status;
3593
3594         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3595         if (status < 0)
3596                 return status;
3597         do_renew_lease(clp, now);
3598         return 0;
3599 }
3600
3601 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3602 {
3603         return (server->caps & NFS_CAP_ACLS)
3604                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3605                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3606 }
3607
3608 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3609  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3610  * the stack.
3611  */
3612 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3613
3614 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3615                 struct page **pages, unsigned int *pgbase)
3616 {
3617         struct page *newpage, **spages;
3618         int rc = 0;
3619         size_t len;
3620         spages = pages;
3621
3622         do {
3623                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3624                 newpage = alloc_page(GFP_KERNEL);
3625
3626                 if (newpage == NULL)
3627                         goto unwind;
3628                 memcpy(page_address(newpage), buf, len);
3629                 buf += len;
3630                 buflen -= len;
3631                 *pages++ = newpage;
3632                 rc++;
3633         } while (buflen != 0);
3634
3635         return rc;
3636
3637 unwind:
3638         for(; rc > 0; rc--)
3639                 __free_page(spages[rc-1]);
3640         return -ENOMEM;
3641 }
3642
3643 struct nfs4_cached_acl {
3644         int cached;
3645         size_t len;
3646         char data[0];
3647 };
3648
3649 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3650 {
3651         struct nfs_inode *nfsi = NFS_I(inode);
3652
3653         spin_lock(&inode->i_lock);
3654         kfree(nfsi->nfs4_acl);
3655         nfsi->nfs4_acl = acl;
3656         spin_unlock(&inode->i_lock);
3657 }
3658
3659 static void nfs4_zap_acl_attr(struct inode *inode)
3660 {
3661         nfs4_set_cached_acl(inode, NULL);
3662 }
3663
3664 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3665 {
3666         struct nfs_inode *nfsi = NFS_I(inode);
3667         struct nfs4_cached_acl *acl;
3668         int ret = -ENOENT;
3669
3670         spin_lock(&inode->i_lock);
3671         acl = nfsi->nfs4_acl;
3672         if (acl == NULL)
3673                 goto out;
3674         if (buf == NULL) /* user is just asking for length */
3675                 goto out_len;
3676         if (acl->cached == 0)
3677                 goto out;
3678         ret = -ERANGE; /* see getxattr(2) man page */
3679         if (acl->len > buflen)
3680                 goto out;
3681         memcpy(buf, acl->data, acl->len);
3682 out_len:
3683         ret = acl->len;
3684 out:
3685         spin_unlock(&inode->i_lock);
3686         return ret;
3687 }
3688
3689 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3690 {
3691         struct nfs4_cached_acl *acl;
3692
3693         if (pages && acl_len <= PAGE_SIZE) {
3694                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3695                 if (acl == NULL)
3696                         goto out;
3697                 acl->cached = 1;
3698                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3699         } else {
3700                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3701                 if (acl == NULL)
3702                         goto out;
3703                 acl->cached = 0;
3704         }
3705         acl->len = acl_len;
3706 out:
3707         nfs4_set_cached_acl(inode, acl);
3708 }
3709
3710 /*
3711  * The getxattr API returns the required buffer length when called with a
3712  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3713  * the required buf.  On a NULL buf, we send a page of data to the server
3714  * guessing that the ACL request can be serviced by a page. If so, we cache
3715  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3716  * the cache. If not so, we throw away the page, and cache the required
3717  * length. The next getxattr call will then produce another round trip to
3718  * the server, this time with the input buf of the required size.
3719  */
3720 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3721 {
3722         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3723         struct nfs_getaclargs args = {
3724                 .fh = NFS_FH(inode),
3725                 .acl_pages = pages,
3726                 .acl_len = buflen,
3727         };
3728         struct nfs_getaclres res = {
3729                 .acl_len = buflen,
3730         };
3731         struct rpc_message msg = {
3732                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3733                 .rpc_argp = &args,
3734                 .rpc_resp = &res,
3735         };
3736         int ret = -ENOMEM, npages, i, acl_len = 0;
3737
3738         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3739         /* As long as we're doing a round trip to the server anyway,
3740          * let's be prepared for a page of acl data. */
3741         if (npages == 0)
3742                 npages = 1;
3743
3744         /* Add an extra page to handle the bitmap returned */
3745         npages++;
3746
3747         for (i = 0; i < npages; i++) {
3748                 pages[i] = alloc_page(GFP_KERNEL);
3749                 if (!pages[i])
3750                         goto out_free;
3751         }
3752
3753         /* for decoding across pages */
3754         res.acl_scratch = alloc_page(GFP_KERNEL);
3755         if (!res.acl_scratch)
3756                 goto out_free;
3757
3758         args.acl_len = npages * PAGE_SIZE;
3759         args.acl_pgbase = 0;
3760
3761         /* Let decode_getfacl know not to fail if the ACL data is larger than
3762          * the page we send as a guess */
3763         if (buf == NULL)
3764                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3765
3766         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3767                 __func__, buf, buflen, npages, args.acl_len);
3768         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3769                              &msg, &args.seq_args, &res.seq_res, 0);
3770         if (ret)
3771                 goto out_free;
3772
3773         acl_len = res.acl_len - res.acl_data_offset;
3774         if (acl_len > args.acl_len)
3775                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3776         else
3777                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3778                                       acl_len);
3779         if (buf) {
3780                 ret = -ERANGE;
3781                 if (acl_len > buflen)
3782                         goto out_free;
3783                 _copy_from_pages(buf, pages, res.acl_data_offset,
3784                                 acl_len);
3785         }
3786         ret = acl_len;
3787 out_free:
3788         for (i = 0; i < npages; i++)
3789                 if (pages[i])
3790                         __free_page(pages[i]);
3791         if (res.acl_scratch)
3792                 __free_page(res.acl_scratch);
3793         return ret;
3794 }
3795
3796 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3797 {
3798         struct nfs4_exception exception = { };
3799         ssize_t ret;
3800         do {
3801                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3802                 if (ret >= 0)
3803                         break;
3804                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3805         } while (exception.retry);
3806         return ret;
3807 }
3808
3809 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3810 {
3811         struct nfs_server *server = NFS_SERVER(inode);
3812         int ret;
3813
3814         if (!nfs4_server_supports_acls(server))
3815                 return -EOPNOTSUPP;
3816         ret = nfs_revalidate_inode(server, inode);
3817         if (ret < 0)
3818                 return ret;
3819         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3820                 nfs_zap_acl_cache(inode);
3821         ret = nfs4_read_cached_acl(inode, buf, buflen);
3822         if (ret != -ENOENT)
3823                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3824                  * but no cached acl data, just the acl length */
3825                 return ret;
3826         return nfs4_get_acl_uncached(inode, buf, buflen);
3827 }
3828
3829 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3830 {
3831         struct nfs_server *server = NFS_SERVER(inode);
3832         struct page *pages[NFS4ACL_MAXPAGES];
3833         struct nfs_setaclargs arg = {
3834                 .fh             = NFS_FH(inode),
3835                 .acl_pages      = pages,
3836                 .acl_len        = buflen,
3837         };
3838         struct nfs_setaclres res;
3839         struct rpc_message msg = {
3840                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3841                 .rpc_argp       = &arg,
3842                 .rpc_resp       = &res,
3843         };
3844         int ret, i;
3845
3846         if (!nfs4_server_supports_acls(server))
3847                 return -EOPNOTSUPP;
3848         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3849         if (i < 0)
3850                 return i;
3851         nfs_inode_return_delegation(inode);
3852         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3853
3854         /*
3855          * Free each page after tx, so the only ref left is
3856          * held by the network stack
3857          */
3858         for (; i > 0; i--)
3859                 put_page(pages[i-1]);
3860
3861         /*
3862          * Acl update can result in inode attribute update.
3863          * so mark the attribute cache invalid.
3864          */
3865         spin_lock(&inode->i_lock);
3866         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3867         spin_unlock(&inode->i_lock);
3868         nfs_access_zap_cache(inode);
3869         nfs_zap_acl_cache(inode);
3870         return ret;
3871 }
3872
3873 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3874 {
3875         struct nfs4_exception exception = { };
3876         int err;
3877         do {
3878                 err = nfs4_handle_exception(NFS_SERVER(inode),
3879                                 __nfs4_proc_set_acl(inode, buf, buflen),
3880                                 &exception);
3881         } while (exception.retry);
3882         return err;
3883 }
3884
3885 static int
3886 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3887 {
3888         struct nfs_client *clp = server->nfs_client;
3889
3890         if (task->tk_status >= 0)
3891                 return 0;
3892         switch(task->tk_status) {
3893                 case -NFS4ERR_DELEG_REVOKED:
3894                 case -NFS4ERR_ADMIN_REVOKED:
3895                 case -NFS4ERR_BAD_STATEID:
3896                         if (state == NULL)
3897                                 break;
3898                         nfs_remove_bad_delegation(state->inode);
3899                 case -NFS4ERR_OPENMODE:
3900                         if (state == NULL)
3901                                 break;
3902                         nfs4_schedule_stateid_recovery(server, state);
3903                         goto wait_on_recovery;
3904                 case -NFS4ERR_EXPIRED:
3905                         if (state != NULL)
3906                                 nfs4_schedule_stateid_recovery(server, state);
3907                 case -NFS4ERR_STALE_STATEID:
3908                 case -NFS4ERR_STALE_CLIENTID:
3909                         nfs4_schedule_lease_recovery(clp);
3910                         goto wait_on_recovery;
3911 #if defined(CONFIG_NFS_V4_1)
3912                 case -NFS4ERR_BADSESSION:
3913                 case -NFS4ERR_BADSLOT:
3914                 case -NFS4ERR_BAD_HIGH_SLOT:
3915                 case -NFS4ERR_DEADSESSION:
3916                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3917                 case -NFS4ERR_SEQ_FALSE_RETRY:
3918                 case -NFS4ERR_SEQ_MISORDERED:
3919                         dprintk("%s ERROR %d, Reset session\n", __func__,
3920                                 task->tk_status);
3921                         nfs4_schedule_session_recovery(clp->cl_session);
3922                         task->tk_status = 0;
3923                         return -EAGAIN;
3924 #endif /* CONFIG_NFS_V4_1 */
3925                 case -NFS4ERR_DELAY:
3926                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3927                 case -NFS4ERR_GRACE:
3928                 case -EKEYEXPIRED:
3929                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3930                         task->tk_status = 0;
3931                         return -EAGAIN;
3932                 case -NFS4ERR_RETRY_UNCACHED_REP:
3933                 case -NFS4ERR_OLD_STATEID:
3934                         task->tk_status = 0;
3935                         return -EAGAIN;
3936         }
3937         task->tk_status = nfs4_map_errors(task->tk_status);
3938         return 0;
3939 wait_on_recovery:
3940         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3941         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3942                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3943         task->tk_status = 0;
3944         return -EAGAIN;
3945 }
3946
3947 static void nfs4_construct_boot_verifier(struct nfs_client *clp,
3948                                          nfs4_verifier *bootverf)
3949 {
3950         __be32 verf[2];
3951
3952         verf[0] = htonl((u32)clp->cl_boot_time.tv_sec);
3953         verf[1] = htonl((u32)clp->cl_boot_time.tv_nsec);
3954         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3955 }
3956
3957 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3958                 unsigned short port, struct rpc_cred *cred,
3959                 struct nfs4_setclientid_res *res)
3960 {
3961         nfs4_verifier sc_verifier;
3962         struct nfs4_setclientid setclientid = {
3963                 .sc_verifier = &sc_verifier,
3964                 .sc_prog = program,
3965                 .sc_cb_ident = clp->cl_cb_ident,
3966         };
3967         struct rpc_message msg = {
3968                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3969                 .rpc_argp = &setclientid,
3970                 .rpc_resp = res,
3971                 .rpc_cred = cred,
3972         };
3973         int loop = 0;
3974         int status;
3975
3976         nfs4_construct_boot_verifier(clp, &sc_verifier);
3977
3978         for(;;) {
3979                 rcu_read_lock();
3980                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3981                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3982                                 clp->cl_ipaddr,
3983                                 rpc_peeraddr2str(clp->cl_rpcclient,
3984                                                         RPC_DISPLAY_ADDR),
3985                                 rpc_peeraddr2str(clp->cl_rpcclient,
3986                                                         RPC_DISPLAY_PROTO),
3987                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3988                                 clp->cl_id_uniquifier);
3989                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3990                                 sizeof(setclientid.sc_netid),
3991                                 rpc_peeraddr2str(clp->cl_rpcclient,
3992                                                         RPC_DISPLAY_NETID));
3993                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3994                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3995                                 clp->cl_ipaddr, port >> 8, port & 255);
3996                 rcu_read_unlock();
3997
3998                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3999                 if (status != -NFS4ERR_CLID_INUSE)
4000                         break;
4001                 if (loop != 0) {
4002                         ++clp->cl_id_uniquifier;
4003                         break;
4004                 }
4005                 ++loop;
4006                 ssleep(clp->cl_lease_time / HZ + 1);
4007         }
4008         return status;
4009 }
4010
4011 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4012                 struct nfs4_setclientid_res *arg,
4013                 struct rpc_cred *cred)
4014 {
4015         struct nfs_fsinfo fsinfo;
4016         struct rpc_message msg = {
4017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4018                 .rpc_argp = arg,
4019                 .rpc_resp = &fsinfo,
4020                 .rpc_cred = cred,
4021         };
4022         unsigned long now;
4023         int status;
4024
4025         now = jiffies;
4026         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4027         if (status == 0) {
4028                 spin_lock(&clp->cl_lock);
4029                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4030                 clp->cl_last_renewal = now;
4031                 spin_unlock(&clp->cl_lock);
4032         }
4033         return status;
4034 }
4035
4036 struct nfs4_delegreturndata {
4037         struct nfs4_delegreturnargs args;
4038         struct nfs4_delegreturnres res;
4039         struct nfs_fh fh;
4040         nfs4_stateid stateid;
4041         unsigned long timestamp;
4042         struct nfs_fattr fattr;
4043         int rpc_status;
4044 };
4045
4046 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4047 {
4048         struct nfs4_delegreturndata *data = calldata;
4049
4050         if (!nfs4_sequence_done(task, &data->res.seq_res))
4051                 return;
4052
4053         switch (task->tk_status) {
4054         case -NFS4ERR_STALE_STATEID:
4055         case -NFS4ERR_EXPIRED:
4056         case 0:
4057                 renew_lease(data->res.server, data->timestamp);
4058                 break;
4059         default:
4060                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4061                                 -EAGAIN) {
4062                         rpc_restart_call_prepare(task);
4063                         return;
4064                 }
4065         }
4066         data->rpc_status = task->tk_status;
4067 }
4068
4069 static void nfs4_delegreturn_release(void *calldata)
4070 {
4071         kfree(calldata);
4072 }
4073
4074 #if defined(CONFIG_NFS_V4_1)
4075 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4076 {
4077         struct nfs4_delegreturndata *d_data;
4078
4079         d_data = (struct nfs4_delegreturndata *)data;
4080
4081         if (nfs4_setup_sequence(d_data->res.server,
4082                                 &d_data->args.seq_args,
4083                                 &d_data->res.seq_res, task))
4084                 return;
4085         rpc_call_start(task);
4086 }
4087 #endif /* CONFIG_NFS_V4_1 */
4088
4089 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4090 #if defined(CONFIG_NFS_V4_1)
4091         .rpc_call_prepare = nfs4_delegreturn_prepare,
4092 #endif /* CONFIG_NFS_V4_1 */
4093         .rpc_call_done = nfs4_delegreturn_done,
4094         .rpc_release = nfs4_delegreturn_release,
4095 };
4096
4097 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4098 {
4099         struct nfs4_delegreturndata *data;
4100         struct nfs_server *server = NFS_SERVER(inode);
4101         struct rpc_task *task;
4102         struct rpc_message msg = {
4103                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4104                 .rpc_cred = cred,
4105         };
4106         struct rpc_task_setup task_setup_data = {
4107                 .rpc_client = server->client,
4108                 .rpc_message = &msg,
4109                 .callback_ops = &nfs4_delegreturn_ops,
4110                 .flags = RPC_TASK_ASYNC,
4111         };
4112         int status = 0;
4113
4114         data = kzalloc(sizeof(*data), GFP_NOFS);
4115         if (data == NULL)
4116                 return -ENOMEM;
4117         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4118         data->args.fhandle = &data->fh;
4119         data->args.stateid = &data->stateid;
4120         data->args.bitmask = server->attr_bitmask;
4121         nfs_copy_fh(&data->fh, NFS_FH(inode));
4122         nfs4_stateid_copy(&data->stateid, stateid);
4123         data->res.fattr = &data->fattr;
4124         data->res.server = server;
4125         nfs_fattr_init(data->res.fattr);
4126         data->timestamp = jiffies;
4127         data->rpc_status = 0;
4128
4129         task_setup_data.callback_data = data;
4130         msg.rpc_argp = &data->args;
4131         msg.rpc_resp = &data->res;
4132         task = rpc_run_task(&task_setup_data);
4133         if (IS_ERR(task))
4134                 return PTR_ERR(task);
4135         if (!issync)
4136                 goto out;
4137         status = nfs4_wait_for_completion_rpc_task(task);
4138         if (status != 0)
4139                 goto out;
4140         status = data->rpc_status;
4141         if (status != 0)
4142                 goto out;
4143         nfs_refresh_inode(inode, &data->fattr);
4144 out:
4145         rpc_put_task(task);
4146         return status;
4147 }
4148
4149 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4150 {
4151         struct nfs_server *server = NFS_SERVER(inode);
4152         struct nfs4_exception exception = { };
4153         int err;
4154         do {
4155                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4156                 switch (err) {
4157                         case -NFS4ERR_STALE_STATEID:
4158                         case -NFS4ERR_EXPIRED:
4159                         case 0:
4160                                 return 0;
4161                 }
4162                 err = nfs4_handle_exception(server, err, &exception);
4163         } while (exception.retry);
4164         return err;
4165 }
4166
4167 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4168 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4169
4170 /*
4171  * sleep, with exponential backoff, and retry the LOCK operation.
4172  */
4173 static unsigned long
4174 nfs4_set_lock_task_retry(unsigned long timeout)
4175 {
4176         freezable_schedule_timeout_killable(timeout);
4177         timeout <<= 1;
4178         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4179                 return NFS4_LOCK_MAXTIMEOUT;
4180         return timeout;
4181 }
4182
4183 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4184 {
4185         struct inode *inode = state->inode;
4186         struct nfs_server *server = NFS_SERVER(inode);
4187         struct nfs_client *clp = server->nfs_client;
4188         struct nfs_lockt_args arg = {
4189                 .fh = NFS_FH(inode),
4190                 .fl = request,
4191         };
4192         struct nfs_lockt_res res = {
4193                 .denied = request,
4194         };
4195         struct rpc_message msg = {
4196                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4197                 .rpc_argp       = &arg,
4198                 .rpc_resp       = &res,
4199                 .rpc_cred       = state->owner->so_cred,
4200         };
4201         struct nfs4_lock_state *lsp;
4202         int status;
4203
4204         arg.lock_owner.clientid = clp->cl_clientid;
4205         status = nfs4_set_lock_state(state, request);
4206         if (status != 0)
4207                 goto out;
4208         lsp = request->fl_u.nfs4_fl.owner;
4209         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4210         arg.lock_owner.s_dev = server->s_dev;
4211         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4212         switch (status) {
4213                 case 0:
4214                         request->fl_type = F_UNLCK;
4215                         break;
4216                 case -NFS4ERR_DENIED:
4217                         status = 0;
4218         }
4219         request->fl_ops->fl_release_private(request);
4220 out:
4221         return status;
4222 }
4223
4224 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4225 {
4226         struct nfs4_exception exception = { };
4227         int err;
4228
4229         do {
4230                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4231                                 _nfs4_proc_getlk(state, cmd, request),
4232                                 &exception);
4233         } while (exception.retry);
4234         return err;
4235 }
4236
4237 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4238 {
4239         int res = 0;
4240         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4241                 case FL_POSIX:
4242                         res = posix_lock_file_wait(file, fl);
4243                         break;
4244                 case FL_FLOCK:
4245                         res = flock_lock_file_wait(file, fl);
4246                         break;
4247                 default:
4248                         BUG();
4249         }
4250         return res;
4251 }
4252
4253 struct nfs4_unlockdata {
4254         struct nfs_locku_args arg;
4255         struct nfs_locku_res res;
4256         struct nfs4_lock_state *lsp;
4257         struct nfs_open_context *ctx;
4258         struct file_lock fl;
4259         const struct nfs_server *server;
4260         unsigned long timestamp;
4261 };
4262
4263 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4264                 struct nfs_open_context *ctx,
4265                 struct nfs4_lock_state *lsp,
4266                 struct nfs_seqid *seqid)
4267 {
4268         struct nfs4_unlockdata *p;
4269         struct inode *inode = lsp->ls_state->inode;
4270
4271         p = kzalloc(sizeof(*p), GFP_NOFS);
4272         if (p == NULL)
4273                 return NULL;
4274         p->arg.fh = NFS_FH(inode);
4275         p->arg.fl = &p->fl;
4276         p->arg.seqid = seqid;
4277         p->res.seqid = seqid;
4278         p->arg.stateid = &lsp->ls_stateid;
4279         p->lsp = lsp;
4280         atomic_inc(&lsp->ls_count);
4281         /* Ensure we don't close file until we're done freeing locks! */
4282         p->ctx = get_nfs_open_context(ctx);
4283         memcpy(&p->fl, fl, sizeof(p->fl));
4284         p->server = NFS_SERVER(inode);
4285         return p;
4286 }
4287
4288 static void nfs4_locku_release_calldata(void *data)
4289 {
4290         struct nfs4_unlockdata *calldata = data;
4291         nfs_free_seqid(calldata->arg.seqid);
4292         nfs4_put_lock_state(calldata->lsp);
4293         put_nfs_open_context(calldata->ctx);
4294         kfree(calldata);
4295 }
4296
4297 static void nfs4_locku_done(struct rpc_task *task, void *data)
4298 {
4299         struct nfs4_unlockdata *calldata = data;
4300
4301         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4302                 return;
4303         switch (task->tk_status) {
4304                 case 0:
4305                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4306                                         &calldata->res.stateid);
4307                         renew_lease(calldata->server, calldata->timestamp);
4308                         break;
4309                 case -NFS4ERR_BAD_STATEID:
4310                 case -NFS4ERR_OLD_STATEID:
4311                 case -NFS4ERR_STALE_STATEID:
4312                 case -NFS4ERR_EXPIRED:
4313                         break;
4314                 default:
4315                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4316                                 rpc_restart_call_prepare(task);
4317         }
4318 }
4319
4320 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4321 {
4322         struct nfs4_unlockdata *calldata = data;
4323
4324         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4325                 return;
4326         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4327                 /* Note: exit _without_ running nfs4_locku_done */
4328                 task->tk_action = NULL;
4329                 return;
4330         }
4331         calldata->timestamp = jiffies;
4332         if (nfs4_setup_sequence(calldata->server,
4333                                 &calldata->arg.seq_args,
4334                                 &calldata->res.seq_res, task))
4335                 return;
4336         rpc_call_start(task);
4337 }
4338
4339 static const struct rpc_call_ops nfs4_locku_ops = {
4340         .rpc_call_prepare = nfs4_locku_prepare,
4341         .rpc_call_done = nfs4_locku_done,
4342         .rpc_release = nfs4_locku_release_calldata,
4343 };
4344
4345 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4346                 struct nfs_open_context *ctx,
4347                 struct nfs4_lock_state *lsp,
4348                 struct nfs_seqid *seqid)
4349 {
4350         struct nfs4_unlockdata *data;
4351         struct rpc_message msg = {
4352                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4353                 .rpc_cred = ctx->cred,
4354         };
4355         struct rpc_task_setup task_setup_data = {
4356                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4357                 .rpc_message = &msg,
4358                 .callback_ops = &nfs4_locku_ops,
4359                 .workqueue = nfsiod_workqueue,
4360                 .flags = RPC_TASK_ASYNC,
4361         };
4362
4363         /* Ensure this is an unlock - when canceling a lock, the
4364          * canceled lock is passed in, and it won't be an unlock.
4365          */
4366         fl->fl_type = F_UNLCK;
4367
4368         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4369         if (data == NULL) {
4370                 nfs_free_seqid(seqid);
4371                 return ERR_PTR(-ENOMEM);
4372         }
4373
4374         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4375         msg.rpc_argp = &data->arg;
4376         msg.rpc_resp = &data->res;
4377         task_setup_data.callback_data = data;
4378         return rpc_run_task(&task_setup_data);
4379 }
4380
4381 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4382 {
4383         struct nfs_inode *nfsi = NFS_I(state->inode);
4384         struct nfs_seqid *seqid;
4385         struct nfs4_lock_state *lsp;
4386         struct rpc_task *task;
4387         int status = 0;
4388         unsigned char fl_flags = request->fl_flags;
4389
4390         status = nfs4_set_lock_state(state, request);
4391         /* Unlock _before_ we do the RPC call */
4392         request->fl_flags |= FL_EXISTS;
4393         down_read(&nfsi->rwsem);
4394         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4395                 up_read(&nfsi->rwsem);
4396                 goto out;
4397         }
4398         up_read(&nfsi->rwsem);
4399         if (status != 0)
4400                 goto out;
4401         /* Is this a delegated lock? */
4402         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4403                 goto out;
4404         lsp = request->fl_u.nfs4_fl.owner;
4405         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4406         status = -ENOMEM;
4407         if (seqid == NULL)
4408                 goto out;
4409         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4410         status = PTR_ERR(task);
4411         if (IS_ERR(task))
4412                 goto out;
4413         status = nfs4_wait_for_completion_rpc_task(task);
4414         rpc_put_task(task);
4415 out:
4416         request->fl_flags = fl_flags;
4417         return status;
4418 }
4419
4420 struct nfs4_lockdata {
4421         struct nfs_lock_args arg;
4422         struct nfs_lock_res res;
4423         struct nfs4_lock_state *lsp;
4424         struct nfs_open_context *ctx;
4425         struct file_lock fl;
4426         unsigned long timestamp;
4427         int rpc_status;
4428         int cancelled;
4429         struct nfs_server *server;
4430 };
4431
4432 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4433                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4434                 gfp_t gfp_mask)
4435 {
4436         struct nfs4_lockdata *p;
4437         struct inode *inode = lsp->ls_state->inode;
4438         struct nfs_server *server = NFS_SERVER(inode);
4439
4440         p = kzalloc(sizeof(*p), gfp_mask);
4441         if (p == NULL)
4442                 return NULL;
4443
4444         p->arg.fh = NFS_FH(inode);
4445         p->arg.fl = &p->fl;
4446         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4447         if (p->arg.open_seqid == NULL)
4448                 goto out_free;
4449         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4450         if (p->arg.lock_seqid == NULL)
4451                 goto out_free_seqid;
4452         p->arg.lock_stateid = &lsp->ls_stateid;
4453         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4454         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4455         p->arg.lock_owner.s_dev = server->s_dev;
4456         p->res.lock_seqid = p->arg.lock_seqid;
4457         p->lsp = lsp;
4458         p->server = server;
4459         atomic_inc(&lsp->ls_count);
4460         p->ctx = get_nfs_open_context(ctx);
4461         memcpy(&p->fl, fl, sizeof(p->fl));
4462         return p;
4463 out_free_seqid:
4464         nfs_free_seqid(p->arg.open_seqid);
4465 out_free:
4466         kfree(p);
4467         return NULL;
4468 }
4469
4470 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4471 {
4472         struct nfs4_lockdata *data = calldata;
4473         struct nfs4_state *state = data->lsp->ls_state;
4474
4475         dprintk("%s: begin!\n", __func__);
4476         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4477                 return;
4478         /* Do we need to do an open_to_lock_owner? */
4479         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4480                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4481                         return;
4482                 data->arg.open_stateid = &state->stateid;
4483                 data->arg.new_lock_owner = 1;
4484                 data->res.open_seqid = data->arg.open_seqid;
4485         } else
4486                 data->arg.new_lock_owner = 0;
4487         data->timestamp = jiffies;
4488         if (nfs4_setup_sequence(data->server,
4489                                 &data->arg.seq_args,
4490                                 &data->res.seq_res, task))
4491                 return;
4492         rpc_call_start(task);
4493         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4494 }
4495
4496 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4497 {
4498         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4499         nfs4_lock_prepare(task, calldata);
4500 }
4501
4502 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4503 {
4504         struct nfs4_lockdata *data = calldata;
4505
4506         dprintk("%s: begin!\n", __func__);
4507
4508         if (!nfs4_sequence_done(task, &data->res.seq_res))
4509                 return;
4510
4511         data->rpc_status = task->tk_status;
4512         if (data->arg.new_lock_owner != 0) {
4513                 if (data->rpc_status == 0)
4514                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4515                 else
4516                         goto out;
4517         }
4518         if (data->rpc_status == 0) {
4519                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4520                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4521                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4522         }
4523 out:
4524         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4525 }
4526
4527 static void nfs4_lock_release(void *calldata)
4528 {
4529         struct nfs4_lockdata *data = calldata;
4530
4531         dprintk("%s: begin!\n", __func__);
4532         nfs_free_seqid(data->arg.open_seqid);
4533         if (data->cancelled != 0) {
4534                 struct rpc_task *task;
4535                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4536                                 data->arg.lock_seqid);
4537                 if (!IS_ERR(task))
4538                         rpc_put_task_async(task);
4539                 dprintk("%s: cancelling lock!\n", __func__);
4540         } else
4541                 nfs_free_seqid(data->arg.lock_seqid);
4542         nfs4_put_lock_state(data->lsp);
4543         put_nfs_open_context(data->ctx);
4544         kfree(data);
4545         dprintk("%s: done!\n", __func__);
4546 }
4547
4548 static const struct rpc_call_ops nfs4_lock_ops = {
4549         .rpc_call_prepare = nfs4_lock_prepare,
4550         .rpc_call_done = nfs4_lock_done,
4551         .rpc_release = nfs4_lock_release,
4552 };
4553
4554 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4555         .rpc_call_prepare = nfs4_recover_lock_prepare,
4556         .rpc_call_done = nfs4_lock_done,
4557         .rpc_release = nfs4_lock_release,
4558 };
4559
4560 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4561 {
4562         switch (error) {
4563         case -NFS4ERR_ADMIN_REVOKED:
4564         case -NFS4ERR_BAD_STATEID:
4565                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4566                 if (new_lock_owner != 0 ||
4567                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4568                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4569                 break;
4570         case -NFS4ERR_STALE_STATEID:
4571                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4572         case -NFS4ERR_EXPIRED:
4573                 nfs4_schedule_lease_recovery(server->nfs_client);
4574         };
4575 }
4576
4577 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4578 {
4579         struct nfs4_lockdata *data;
4580         struct rpc_task *task;
4581         struct rpc_message msg = {
4582                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4583                 .rpc_cred = state->owner->so_cred,
4584         };
4585         struct rpc_task_setup task_setup_data = {
4586                 .rpc_client = NFS_CLIENT(state->inode),
4587                 .rpc_message = &msg,
4588                 .callback_ops = &nfs4_lock_ops,
4589                 .workqueue = nfsiod_workqueue,
4590                 .flags = RPC_TASK_ASYNC,
4591         };
4592         int ret;
4593
4594         dprintk("%s: begin!\n", __func__);
4595         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4596                         fl->fl_u.nfs4_fl.owner,
4597                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4598         if (data == NULL)
4599                 return -ENOMEM;
4600         if (IS_SETLKW(cmd))
4601                 data->arg.block = 1;
4602         if (recovery_type > NFS_LOCK_NEW) {
4603                 if (recovery_type == NFS_LOCK_RECLAIM)
4604                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4605                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4606         }
4607         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4608         msg.rpc_argp = &data->arg;
4609         msg.rpc_resp = &data->res;
4610         task_setup_data.callback_data = data;
4611         task = rpc_run_task(&task_setup_data);
4612         if (IS_ERR(task))
4613                 return PTR_ERR(task);
4614         ret = nfs4_wait_for_completion_rpc_task(task);
4615         if (ret == 0) {
4616                 ret = data->rpc_status;
4617                 if (ret)
4618                         nfs4_handle_setlk_error(data->server, data->lsp,
4619                                         data->arg.new_lock_owner, ret);
4620         } else
4621                 data->cancelled = 1;
4622         rpc_put_task(task);
4623         dprintk("%s: done, ret = %d!\n", __func__, ret);
4624         return ret;
4625 }
4626
4627 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4628 {
4629         struct nfs_server *server = NFS_SERVER(state->inode);
4630         struct nfs4_exception exception = {
4631                 .inode = state->inode,
4632         };
4633         int err;
4634
4635         do {
4636                 /* Cache the lock if possible... */
4637                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4638                         return 0;
4639                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4640                 if (err != -NFS4ERR_DELAY)
4641                         break;
4642                 nfs4_handle_exception(server, err, &exception);
4643         } while (exception.retry);
4644         return err;
4645 }
4646
4647 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4648 {
4649         struct nfs_server *server = NFS_SERVER(state->inode);
4650         struct nfs4_exception exception = {
4651                 .inode = state->inode,
4652         };
4653         int err;
4654
4655         err = nfs4_set_lock_state(state, request);
4656         if (err != 0)
4657                 return err;
4658         do {
4659                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4660                         return 0;
4661                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4662                 switch (err) {
4663                 default:
4664                         goto out;
4665                 case -NFS4ERR_GRACE:
4666                 case -NFS4ERR_DELAY:
4667                         nfs4_handle_exception(server, err, &exception);
4668                         err = 0;
4669                 }
4670         } while (exception.retry);
4671 out:
4672         return err;
4673 }
4674
4675 #if defined(CONFIG_NFS_V4_1)
4676 static int nfs41_check_expired_locks(struct nfs4_state *state)
4677 {
4678         int status, ret = NFS_OK;
4679         struct nfs4_lock_state *lsp;
4680         struct nfs_server *server = NFS_SERVER(state->inode);
4681
4682         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4683                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4684                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4685                         if (status != NFS_OK) {
4686                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4687                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4688                                 ret = status;
4689                         }
4690                 }
4691         };
4692
4693         return ret;
4694 }
4695
4696 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4697 {
4698         int status = NFS_OK;
4699
4700         if (test_bit(LK_STATE_IN_USE, &state->flags))
4701                 status = nfs41_check_expired_locks(state);
4702         if (status == NFS_OK)
4703                 return status;
4704         return nfs4_lock_expired(state, request);
4705 }
4706 #endif
4707
4708 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4709 {
4710         struct nfs_inode *nfsi = NFS_I(state->inode);
4711         unsigned char fl_flags = request->fl_flags;
4712         int status = -ENOLCK;
4713
4714         if ((fl_flags & FL_POSIX) &&
4715                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4716                 goto out;
4717         /* Is this a delegated open? */
4718         status = nfs4_set_lock_state(state, request);
4719         if (status != 0)
4720                 goto out;
4721         request->fl_flags |= FL_ACCESS;
4722         status = do_vfs_lock(request->fl_file, request);
4723         if (status < 0)
4724                 goto out;
4725         down_read(&nfsi->rwsem);
4726         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4727                 /* Yes: cache locks! */
4728                 /* ...but avoid races with delegation recall... */
4729                 request->fl_flags = fl_flags & ~FL_SLEEP;
4730                 status = do_vfs_lock(request->fl_file, request);
4731                 goto out_unlock;
4732         }
4733         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4734         if (status != 0)
4735                 goto out_unlock;
4736         /* Note: we always want to sleep here! */
4737         request->fl_flags = fl_flags | FL_SLEEP;
4738         if (do_vfs_lock(request->fl_file, request) < 0)
4739                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4740                         "manager!\n", __func__);
4741 out_unlock:
4742         up_read(&nfsi->rwsem);
4743 out:
4744         request->fl_flags = fl_flags;
4745         return status;
4746 }
4747
4748 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4749 {
4750         struct nfs4_exception exception = {
4751                 .state = state,
4752                 .inode = state->inode,
4753         };
4754         int err;
4755
4756         do {
4757                 err = _nfs4_proc_setlk(state, cmd, request);
4758                 if (err == -NFS4ERR_DENIED)
4759                         err = -EAGAIN;
4760                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4761                                 err, &exception);
4762         } while (exception.retry);
4763         return err;
4764 }
4765
4766 static int
4767 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4768 {
4769         struct nfs_open_context *ctx;
4770         struct nfs4_state *state;
4771         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4772         int status;
4773
4774         /* verify open state */
4775         ctx = nfs_file_open_context(filp);
4776         state = ctx->state;
4777
4778         if (request->fl_start < 0 || request->fl_end < 0)
4779                 return -EINVAL;
4780
4781         if (IS_GETLK(cmd)) {
4782                 if (state != NULL)
4783                         return nfs4_proc_getlk(state, F_GETLK, request);
4784                 return 0;
4785         }
4786
4787         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4788                 return -EINVAL;
4789
4790         if (request->fl_type == F_UNLCK) {
4791                 if (state != NULL)
4792                         return nfs4_proc_unlck(state, cmd, request);
4793                 return 0;
4794         }
4795
4796         if (state == NULL)
4797                 return -ENOLCK;
4798         /*
4799          * Don't rely on the VFS having checked the file open mode,
4800          * since it won't do this for flock() locks.
4801          */
4802         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4803         case F_RDLCK:
4804                 if (!(filp->f_mode & FMODE_READ))
4805                         return -EBADF;
4806                 break;
4807         case F_WRLCK:
4808                 if (!(filp->f_mode & FMODE_WRITE))
4809                         return -EBADF;
4810         }
4811
4812         do {
4813                 status = nfs4_proc_setlk(state, cmd, request);
4814                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4815                         break;
4816                 timeout = nfs4_set_lock_task_retry(timeout);
4817                 status = -ERESTARTSYS;
4818                 if (signalled())
4819                         break;
4820         } while(status < 0);
4821         return status;
4822 }
4823
4824 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4825 {
4826         struct nfs_server *server = NFS_SERVER(state->inode);
4827         struct nfs4_exception exception = { };
4828         int err;
4829
4830         err = nfs4_set_lock_state(state, fl);
4831         if (err != 0)
4832                 goto out;
4833         do {
4834                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4835                 switch (err) {
4836                         default:
4837                                 printk(KERN_ERR "NFS: %s: unhandled error "
4838                                         "%d.\n", __func__, err);
4839                         case 0:
4840                         case -ESTALE:
4841                                 goto out;
4842                         case -NFS4ERR_EXPIRED:
4843                                 nfs4_schedule_stateid_recovery(server, state);
4844                         case -NFS4ERR_STALE_CLIENTID:
4845                         case -NFS4ERR_STALE_STATEID:
4846                                 nfs4_schedule_lease_recovery(server->nfs_client);
4847                                 goto out;
4848                         case -NFS4ERR_BADSESSION:
4849                         case -NFS4ERR_BADSLOT:
4850                         case -NFS4ERR_BAD_HIGH_SLOT:
4851                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4852                         case -NFS4ERR_DEADSESSION:
4853                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4854                                 goto out;
4855                         case -ERESTARTSYS:
4856                                 /*
4857                                  * The show must go on: exit, but mark the
4858                                  * stateid as needing recovery.
4859                                  */
4860                         case -NFS4ERR_DELEG_REVOKED:
4861                         case -NFS4ERR_ADMIN_REVOKED:
4862                         case -NFS4ERR_BAD_STATEID:
4863                         case -NFS4ERR_OPENMODE:
4864                                 nfs4_schedule_stateid_recovery(server, state);
4865                                 err = 0;
4866                                 goto out;
4867                         case -EKEYEXPIRED:
4868                                 /*
4869                                  * User RPCSEC_GSS context has expired.
4870                                  * We cannot recover this stateid now, so
4871                                  * skip it and allow recovery thread to
4872                                  * proceed.
4873                                  */
4874                                 err = 0;
4875                                 goto out;
4876                         case -ENOMEM:
4877                         case -NFS4ERR_DENIED:
4878                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4879                                 err = 0;
4880                                 goto out;
4881                         case -NFS4ERR_DELAY:
4882                                 break;
4883                 }
4884                 err = nfs4_handle_exception(server, err, &exception);
4885         } while (exception.retry);
4886 out:
4887         return err;
4888 }
4889
4890 struct nfs_release_lockowner_data {
4891         struct nfs4_lock_state *lsp;
4892         struct nfs_server *server;
4893         struct nfs_release_lockowner_args args;
4894 };
4895
4896 static void nfs4_release_lockowner_release(void *calldata)
4897 {
4898         struct nfs_release_lockowner_data *data = calldata;
4899         nfs4_free_lock_state(data->server, data->lsp);
4900         kfree(calldata);
4901 }
4902
4903 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4904         .rpc_release = nfs4_release_lockowner_release,
4905 };
4906
4907 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4908 {
4909         struct nfs_server *server = lsp->ls_state->owner->so_server;
4910         struct nfs_release_lockowner_data *data;
4911         struct rpc_message msg = {
4912                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4913         };
4914
4915         if (server->nfs_client->cl_mvops->minor_version != 0)
4916                 return -EINVAL;
4917         data = kmalloc(sizeof(*data), GFP_NOFS);
4918         if (!data)
4919                 return -ENOMEM;
4920         data->lsp = lsp;
4921         data->server = server;
4922         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4923         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4924         data->args.lock_owner.s_dev = server->s_dev;
4925         msg.rpc_argp = &data->args;
4926         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4927         return 0;
4928 }
4929
4930 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4931
4932 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4933                                    const void *buf, size_t buflen,
4934                                    int flags, int type)
4935 {
4936         if (strcmp(key, "") != 0)
4937                 return -EINVAL;
4938
4939         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4940 }
4941
4942 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4943                                    void *buf, size_t buflen, int type)
4944 {
4945         if (strcmp(key, "") != 0)
4946                 return -EINVAL;
4947
4948         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4949 }
4950
4951 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4952                                        size_t list_len, const char *name,
4953                                        size_t name_len, int type)
4954 {
4955         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4956
4957         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4958                 return 0;
4959
4960         if (list && len <= list_len)
4961                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4962         return len;
4963 }
4964
4965 /*
4966  * nfs_fhget will use either the mounted_on_fileid or the fileid
4967  */
4968 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4969 {
4970         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4971                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4972               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4973               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4974                 return;
4975
4976         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4977                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4978         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4979         fattr->nlink = 2;
4980 }
4981
4982 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4983                                    const struct qstr *name,
4984                                    struct nfs4_fs_locations *fs_locations,
4985                                    struct page *page)
4986 {
4987         struct nfs_server *server = NFS_SERVER(dir);
4988         u32 bitmask[2] = {
4989                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4990         };
4991         struct nfs4_fs_locations_arg args = {
4992                 .dir_fh = NFS_FH(dir),
4993                 .name = name,
4994                 .page = page,
4995                 .bitmask = bitmask,
4996         };
4997         struct nfs4_fs_locations_res res = {
4998                 .fs_locations = fs_locations,
4999         };
5000         struct rpc_message msg = {
5001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5002                 .rpc_argp = &args,
5003                 .rpc_resp = &res,
5004         };
5005         int status;
5006
5007         dprintk("%s: start\n", __func__);
5008
5009         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5010          * is not supported */
5011         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5012                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5013         else
5014                 bitmask[0] |= FATTR4_WORD0_FILEID;
5015
5016         nfs_fattr_init(&fs_locations->fattr);
5017         fs_locations->server = server;
5018         fs_locations->nlocations = 0;
5019         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5020         dprintk("%s: returned status = %d\n", __func__, status);
5021         return status;
5022 }
5023
5024 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5025                            const struct qstr *name,
5026                            struct nfs4_fs_locations *fs_locations,
5027                            struct page *page)
5028 {
5029         struct nfs4_exception exception = { };
5030         int err;
5031         do {
5032                 err = nfs4_handle_exception(NFS_SERVER(dir),
5033                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5034                                 &exception);
5035         } while (exception.retry);
5036         return err;
5037 }
5038
5039 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5040 {
5041         int status;
5042         struct nfs4_secinfo_arg args = {
5043                 .dir_fh = NFS_FH(dir),
5044                 .name   = name,
5045         };
5046         struct nfs4_secinfo_res res = {
5047                 .flavors     = flavors,
5048         };
5049         struct rpc_message msg = {
5050                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5051                 .rpc_argp = &args,
5052                 .rpc_resp = &res,
5053         };
5054
5055         dprintk("NFS call  secinfo %s\n", name->name);
5056         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5057         dprintk("NFS reply  secinfo: %d\n", status);
5058         return status;
5059 }
5060
5061 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5062                       struct nfs4_secinfo_flavors *flavors)
5063 {
5064         struct nfs4_exception exception = { };
5065         int err;
5066         do {
5067                 err = nfs4_handle_exception(NFS_SERVER(dir),
5068                                 _nfs4_proc_secinfo(dir, name, flavors),
5069                                 &exception);
5070         } while (exception.retry);
5071         return err;
5072 }
5073
5074 #ifdef CONFIG_NFS_V4_1
5075 /*
5076  * Check the exchange flags returned by the server for invalid flags, having
5077  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5078  * DS flags set.
5079  */
5080 static int nfs4_check_cl_exchange_flags(u32 flags)
5081 {
5082         if (flags & ~EXCHGID4_FLAG_MASK_R)
5083                 goto out_inval;
5084         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5085             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5086                 goto out_inval;
5087         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5088                 goto out_inval;
5089         return NFS_OK;
5090 out_inval:
5091         return -NFS4ERR_INVAL;
5092 }
5093
5094 static bool
5095 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
5096 {
5097         if (a->server_scope_sz == b->server_scope_sz &&
5098             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5099                 return true;
5100
5101         return false;
5102 }
5103
5104 /*
5105  * nfs4_proc_exchange_id()
5106  *
5107  * Since the clientid has expired, all compounds using sessions
5108  * associated with the stale clientid will be returning
5109  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5110  * be in some phase of session reset.
5111  */
5112 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5113 {
5114         nfs4_verifier verifier;
5115         struct nfs41_exchange_id_args args = {
5116                 .verifier = &verifier,
5117                 .client = clp,
5118                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5119         };
5120         struct nfs41_exchange_id_res res = {
5121                 .client = clp,
5122         };
5123         int status;
5124         struct rpc_message msg = {
5125                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5126                 .rpc_argp = &args,
5127                 .rpc_resp = &res,
5128                 .rpc_cred = cred,
5129         };
5130
5131         dprintk("--> %s\n", __func__);
5132         BUG_ON(clp == NULL);
5133
5134         nfs4_construct_boot_verifier(clp, &verifier);
5135
5136         args.id_len = scnprintf(args.id, sizeof(args.id),
5137                                 "%s/%s.%s/%u",
5138                                 clp->cl_ipaddr,
5139                                 init_utsname()->nodename,
5140                                 init_utsname()->domainname,
5141                                 clp->cl_rpcclient->cl_auth->au_flavor);
5142
5143         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
5144         if (unlikely(!res.server_scope)) {
5145                 status = -ENOMEM;
5146                 goto out;
5147         }
5148
5149         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
5150         if (unlikely(!res.impl_id)) {
5151                 status = -ENOMEM;
5152                 goto out_server_scope;
5153         }
5154
5155         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5156         if (!status)
5157                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
5158
5159         if (!status) {
5160                 /* use the most recent implementation id */
5161                 kfree(clp->impl_id);
5162                 clp->impl_id = res.impl_id;
5163         } else
5164                 kfree(res.impl_id);
5165
5166         if (!status) {
5167                 if (clp->server_scope &&
5168                     !nfs41_same_server_scope(clp->server_scope,
5169                                              res.server_scope)) {
5170                         dprintk("%s: server_scope mismatch detected\n",
5171                                 __func__);
5172                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5173                         kfree(clp->server_scope);
5174                         clp->server_scope = NULL;
5175                 }
5176
5177                 if (!clp->server_scope) {
5178                         clp->server_scope = res.server_scope;
5179                         goto out;
5180                 }
5181         }
5182
5183 out_server_scope:
5184         kfree(res.server_scope);
5185 out:
5186         if (clp->impl_id)
5187                 dprintk("%s: Server Implementation ID: "
5188                         "domain: %s, name: %s, date: %llu,%u\n",
5189                         __func__, clp->impl_id->domain, clp->impl_id->name,
5190                         clp->impl_id->date.seconds,
5191                         clp->impl_id->date.nseconds);
5192         dprintk("<-- %s status= %d\n", __func__, status);
5193         return status;
5194 }
5195
5196 struct nfs4_get_lease_time_data {
5197         struct nfs4_get_lease_time_args *args;
5198         struct nfs4_get_lease_time_res *res;
5199         struct nfs_client *clp;
5200 };
5201
5202 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5203                                         void *calldata)
5204 {
5205         int ret;
5206         struct nfs4_get_lease_time_data *data =
5207                         (struct nfs4_get_lease_time_data *)calldata;
5208
5209         dprintk("--> %s\n", __func__);
5210         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5211         /* just setup sequence, do not trigger session recovery
5212            since we're invoked within one */
5213         ret = nfs41_setup_sequence(data->clp->cl_session,
5214                                    &data->args->la_seq_args,
5215                                    &data->res->lr_seq_res, task);
5216
5217         BUG_ON(ret == -EAGAIN);
5218         rpc_call_start(task);
5219         dprintk("<-- %s\n", __func__);
5220 }
5221
5222 /*
5223  * Called from nfs4_state_manager thread for session setup, so don't recover
5224  * from sequence operation or clientid errors.
5225  */
5226 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5227 {
5228         struct nfs4_get_lease_time_data *data =
5229                         (struct nfs4_get_lease_time_data *)calldata;
5230
5231         dprintk("--> %s\n", __func__);
5232         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5233                 return;
5234         switch (task->tk_status) {
5235         case -NFS4ERR_DELAY:
5236         case -NFS4ERR_GRACE:
5237                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5238                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5239                 task->tk_status = 0;
5240                 /* fall through */
5241         case -NFS4ERR_RETRY_UNCACHED_REP:
5242                 rpc_restart_call_prepare(task);
5243                 return;
5244         }
5245         dprintk("<-- %s\n", __func__);
5246 }
5247
5248 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5249         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5250         .rpc_call_done = nfs4_get_lease_time_done,
5251 };
5252
5253 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5254 {
5255         struct rpc_task *task;
5256         struct nfs4_get_lease_time_args args;
5257         struct nfs4_get_lease_time_res res = {
5258                 .lr_fsinfo = fsinfo,
5259         };
5260         struct nfs4_get_lease_time_data data = {
5261                 .args = &args,
5262                 .res = &res,
5263                 .clp = clp,
5264         };
5265         struct rpc_message msg = {
5266                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5267                 .rpc_argp = &args,
5268                 .rpc_resp = &res,
5269         };
5270         struct rpc_task_setup task_setup = {
5271                 .rpc_client = clp->cl_rpcclient,
5272                 .rpc_message = &msg,
5273                 .callback_ops = &nfs4_get_lease_time_ops,
5274                 .callback_data = &data,
5275                 .flags = RPC_TASK_TIMEOUT,
5276         };
5277         int status;
5278
5279         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5280         dprintk("--> %s\n", __func__);
5281         task = rpc_run_task(&task_setup);
5282
5283         if (IS_ERR(task))
5284                 status = PTR_ERR(task);
5285         else {
5286                 status = task->tk_status;
5287                 rpc_put_task(task);
5288         }
5289         dprintk("<-- %s return %d\n", __func__, status);
5290
5291         return status;
5292 }
5293
5294 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5295 {
5296         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5297 }
5298
5299 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5300                 struct nfs4_slot *new,
5301                 u32 max_slots,
5302                 u32 ivalue)
5303 {
5304         struct nfs4_slot *old = NULL;
5305         u32 i;
5306
5307         spin_lock(&tbl->slot_tbl_lock);
5308         if (new) {
5309                 old = tbl->slots;
5310                 tbl->slots = new;
5311                 tbl->max_slots = max_slots;
5312         }
5313         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5314         for (i = 0; i < tbl->max_slots; i++)
5315                 tbl->slots[i].seq_nr = ivalue;
5316         spin_unlock(&tbl->slot_tbl_lock);
5317         kfree(old);
5318 }
5319
5320 /*
5321  * (re)Initialise a slot table
5322  */
5323 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5324                                  u32 ivalue)
5325 {
5326         struct nfs4_slot *new = NULL;
5327         int ret = -ENOMEM;
5328
5329         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5330                 max_reqs, tbl->max_slots);
5331
5332         /* Does the newly negotiated max_reqs match the existing slot table? */
5333         if (max_reqs != tbl->max_slots) {
5334                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5335                 if (!new)
5336                         goto out;
5337         }
5338         ret = 0;
5339
5340         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5341         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5342                 tbl, tbl->slots, tbl->max_slots);
5343 out:
5344         dprintk("<-- %s: return %d\n", __func__, ret);
5345         return ret;
5346 }
5347
5348 /* Destroy the slot table */
5349 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5350 {
5351         if (session->fc_slot_table.slots != NULL) {
5352                 kfree(session->fc_slot_table.slots);
5353                 session->fc_slot_table.slots = NULL;
5354         }
5355         if (session->bc_slot_table.slots != NULL) {
5356                 kfree(session->bc_slot_table.slots);
5357                 session->bc_slot_table.slots = NULL;
5358         }
5359         return;
5360 }
5361
5362 /*
5363  * Initialize or reset the forechannel and backchannel tables
5364  */
5365 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5366 {
5367         struct nfs4_slot_table *tbl;
5368         int status;
5369
5370         dprintk("--> %s\n", __func__);
5371         /* Fore channel */
5372         tbl = &ses->fc_slot_table;
5373         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5374         if (status) /* -ENOMEM */
5375                 return status;
5376         /* Back channel */
5377         tbl = &ses->bc_slot_table;
5378         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5379         if (status && tbl->slots == NULL)
5380                 /* Fore and back channel share a connection so get
5381                  * both slot tables or neither */
5382                 nfs4_destroy_slot_tables(ses);
5383         return status;
5384 }
5385
5386 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5387 {
5388         struct nfs4_session *session;
5389         struct nfs4_slot_table *tbl;
5390
5391         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5392         if (!session)
5393                 return NULL;
5394
5395         tbl = &session->fc_slot_table;
5396         tbl->highest_used_slotid = NFS4_NO_SLOT;
5397         spin_lock_init(&tbl->slot_tbl_lock);
5398         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5399         init_completion(&tbl->complete);
5400
5401         tbl = &session->bc_slot_table;
5402         tbl->highest_used_slotid = NFS4_NO_SLOT;
5403         spin_lock_init(&tbl->slot_tbl_lock);
5404         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5405         init_completion(&tbl->complete);
5406
5407         session->session_state = 1<<NFS4_SESSION_INITING;
5408
5409         session->clp = clp;
5410         return session;
5411 }
5412
5413 void nfs4_destroy_session(struct nfs4_session *session)
5414 {
5415         struct rpc_xprt *xprt;
5416
5417         nfs4_proc_destroy_session(session);
5418
5419         rcu_read_lock();
5420         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5421         rcu_read_unlock();
5422         dprintk("%s Destroy backchannel for xprt %p\n",
5423                 __func__, xprt);
5424         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5425         nfs4_destroy_slot_tables(session);
5426         kfree(session);
5427 }
5428
5429 /*
5430  * Initialize the values to be used by the client in CREATE_SESSION
5431  * If nfs4_init_session set the fore channel request and response sizes,
5432  * use them.
5433  *
5434  * Set the back channel max_resp_sz_cached to zero to force the client to
5435  * always set csa_cachethis to FALSE because the current implementation
5436  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5437  */
5438 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5439 {
5440         struct nfs4_session *session = args->client->cl_session;
5441         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5442                      mxresp_sz = session->fc_attrs.max_resp_sz;
5443
5444         if (mxrqst_sz == 0)
5445                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5446         if (mxresp_sz == 0)
5447                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5448         /* Fore channel attributes */
5449         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5450         args->fc_attrs.max_resp_sz = mxresp_sz;
5451         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5452         args->fc_attrs.max_reqs = max_session_slots;
5453
5454         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5455                 "max_ops=%u max_reqs=%u\n",
5456                 __func__,
5457                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5458                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5459
5460         /* Back channel attributes */
5461         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5462         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5463         args->bc_attrs.max_resp_sz_cached = 0;
5464         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5465         args->bc_attrs.max_reqs = 1;
5466
5467         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5468                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5469                 __func__,
5470                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5471                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5472                 args->bc_attrs.max_reqs);
5473 }
5474
5475 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5476 {
5477         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5478         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5479
5480         if (rcvd->max_resp_sz > sent->max_resp_sz)
5481                 return -EINVAL;
5482         /*
5483          * Our requested max_ops is the minimum we need; we're not
5484          * prepared to break up compounds into smaller pieces than that.
5485          * So, no point even trying to continue if the server won't
5486          * cooperate:
5487          */
5488         if (rcvd->max_ops < sent->max_ops)
5489                 return -EINVAL;
5490         if (rcvd->max_reqs == 0)
5491                 return -EINVAL;
5492         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5493                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5494         return 0;
5495 }
5496
5497 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5498 {
5499         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5500         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5501
5502         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5503                 return -EINVAL;
5504         if (rcvd->max_resp_sz < sent->max_resp_sz)
5505                 return -EINVAL;
5506         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5507                 return -EINVAL;
5508         /* These would render the backchannel useless: */
5509         if (rcvd->max_ops != sent->max_ops)
5510                 return -EINVAL;
5511         if (rcvd->max_reqs != sent->max_reqs)
5512                 return -EINVAL;
5513         return 0;
5514 }
5515
5516 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5517                                      struct nfs4_session *session)
5518 {
5519         int ret;
5520
5521         ret = nfs4_verify_fore_channel_attrs(args, session);
5522         if (ret)
5523                 return ret;
5524         return nfs4_verify_back_channel_attrs(args, session);
5525 }
5526
5527 static int _nfs4_proc_create_session(struct nfs_client *clp)
5528 {
5529         struct nfs4_session *session = clp->cl_session;
5530         struct nfs41_create_session_args args = {
5531                 .client = clp,
5532                 .cb_program = NFS4_CALLBACK,
5533         };
5534         struct nfs41_create_session_res res = {
5535                 .client = clp,
5536         };
5537         struct rpc_message msg = {
5538                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5539                 .rpc_argp = &args,
5540                 .rpc_resp = &res,
5541         };
5542         int status;
5543
5544         nfs4_init_channel_attrs(&args);
5545         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5546
5547         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5548
5549         if (!status)
5550                 /* Verify the session's negotiated channel_attrs values */
5551                 status = nfs4_verify_channel_attrs(&args, session);
5552         if (!status) {
5553                 /* Increment the clientid slot sequence id */
5554                 clp->cl_seqid++;
5555         }
5556
5557         return status;
5558 }
5559
5560 /*
5561  * Issues a CREATE_SESSION operation to the server.
5562  * It is the responsibility of the caller to verify the session is
5563  * expired before calling this routine.
5564  */
5565 int nfs4_proc_create_session(struct nfs_client *clp)
5566 {
5567         int status;
5568         unsigned *ptr;
5569         struct nfs4_session *session = clp->cl_session;
5570
5571         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5572
5573         status = _nfs4_proc_create_session(clp);
5574         if (status)
5575                 goto out;
5576
5577         /* Init or reset the session slot tables */
5578         status = nfs4_setup_session_slot_tables(session);
5579         dprintk("slot table setup returned %d\n", status);
5580         if (status)
5581                 goto out;
5582
5583         ptr = (unsigned *)&session->sess_id.data[0];
5584         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5585                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5586 out:
5587         dprintk("<-- %s\n", __func__);
5588         return status;
5589 }
5590
5591 /*
5592  * Issue the over-the-wire RPC DESTROY_SESSION.
5593  * The caller must serialize access to this routine.
5594  */
5595 int nfs4_proc_destroy_session(struct nfs4_session *session)
5596 {
5597         int status = 0;
5598         struct rpc_message msg;
5599
5600         dprintk("--> nfs4_proc_destroy_session\n");
5601
5602         /* session is still being setup */
5603         if (session->clp->cl_cons_state != NFS_CS_READY)
5604                 return status;
5605
5606         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5607         msg.rpc_argp = session;
5608         msg.rpc_resp = NULL;
5609         msg.rpc_cred = NULL;
5610         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5611
5612         if (status)
5613                 printk(KERN_WARNING
5614                         "NFS: Got error %d from the server on DESTROY_SESSION. "
5615                         "Session has been destroyed regardless...\n", status);
5616
5617         dprintk("<-- nfs4_proc_destroy_session\n");
5618         return status;
5619 }
5620
5621 int nfs4_init_session(struct nfs_server *server)
5622 {
5623         struct nfs_client *clp = server->nfs_client;
5624         struct nfs4_session *session;
5625         unsigned int rsize, wsize;
5626         int ret;
5627
5628         if (!nfs4_has_session(clp))
5629                 return 0;
5630
5631         session = clp->cl_session;
5632         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5633                 return 0;
5634
5635         rsize = server->rsize;
5636         if (rsize == 0)
5637                 rsize = NFS_MAX_FILE_IO_SIZE;
5638         wsize = server->wsize;
5639         if (wsize == 0)
5640                 wsize = NFS_MAX_FILE_IO_SIZE;
5641
5642         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5643         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5644
5645         ret = nfs4_recover_expired_lease(server);
5646         if (!ret)
5647                 ret = nfs4_check_client_ready(clp);
5648         return ret;
5649 }
5650
5651 int nfs4_init_ds_session(struct nfs_client *clp)
5652 {
5653         struct nfs4_session *session = clp->cl_session;
5654         int ret;
5655
5656         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5657                 return 0;
5658
5659         ret = nfs4_client_recover_expired_lease(clp);
5660         if (!ret)
5661                 /* Test for the DS role */
5662                 if (!is_ds_client(clp))
5663                         ret = -ENODEV;
5664         if (!ret)
5665                 ret = nfs4_check_client_ready(clp);
5666         return ret;
5667
5668 }
5669 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5670
5671
5672 /*
5673  * Renew the cl_session lease.
5674  */
5675 struct nfs4_sequence_data {
5676         struct nfs_client *clp;
5677         struct nfs4_sequence_args args;
5678         struct nfs4_sequence_res res;
5679 };
5680
5681 static void nfs41_sequence_release(void *data)
5682 {
5683         struct nfs4_sequence_data *calldata = data;
5684         struct nfs_client *clp = calldata->clp;
5685
5686         if (atomic_read(&clp->cl_count) > 1)
5687                 nfs4_schedule_state_renewal(clp);
5688         nfs_put_client(clp);
5689         kfree(calldata);
5690 }
5691
5692 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5693 {
5694         switch(task->tk_status) {
5695         case -NFS4ERR_DELAY:
5696                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5697                 return -EAGAIN;
5698         default:
5699                 nfs4_schedule_lease_recovery(clp);
5700         }
5701         return 0;
5702 }
5703
5704 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5705 {
5706         struct nfs4_sequence_data *calldata = data;
5707         struct nfs_client *clp = calldata->clp;
5708
5709         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5710                 return;
5711
5712         if (task->tk_status < 0) {
5713                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5714                 if (atomic_read(&clp->cl_count) == 1)
5715                         goto out;
5716
5717                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5718                         rpc_restart_call_prepare(task);
5719                         return;
5720                 }
5721         }
5722         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5723 out:
5724         dprintk("<-- %s\n", __func__);
5725 }
5726
5727 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5728 {
5729         struct nfs4_sequence_data *calldata = data;
5730         struct nfs_client *clp = calldata->clp;
5731         struct nfs4_sequence_args *args;
5732         struct nfs4_sequence_res *res;
5733
5734         args = task->tk_msg.rpc_argp;
5735         res = task->tk_msg.rpc_resp;
5736
5737         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5738                 return;
5739         rpc_call_start(task);
5740 }
5741
5742 static const struct rpc_call_ops nfs41_sequence_ops = {
5743         .rpc_call_done = nfs41_sequence_call_done,
5744         .rpc_call_prepare = nfs41_sequence_prepare,
5745         .rpc_release = nfs41_sequence_release,
5746 };
5747
5748 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5749 {
5750         struct nfs4_sequence_data *calldata;
5751         struct rpc_message msg = {
5752                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5753                 .rpc_cred = cred,
5754         };
5755         struct rpc_task_setup task_setup_data = {
5756                 .rpc_client = clp->cl_rpcclient,
5757                 .rpc_message = &msg,
5758                 .callback_ops = &nfs41_sequence_ops,
5759                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5760         };
5761
5762         if (!atomic_inc_not_zero(&clp->cl_count))
5763                 return ERR_PTR(-EIO);
5764         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5765         if (calldata == NULL) {
5766                 nfs_put_client(clp);
5767                 return ERR_PTR(-ENOMEM);
5768         }
5769         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5770         msg.rpc_argp = &calldata->args;
5771         msg.rpc_resp = &calldata->res;
5772         calldata->clp = clp;
5773         task_setup_data.callback_data = calldata;
5774
5775         return rpc_run_task(&task_setup_data);
5776 }
5777
5778 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5779 {
5780         struct rpc_task *task;
5781         int ret = 0;
5782
5783         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5784                 return 0;
5785         task = _nfs41_proc_sequence(clp, cred);
5786         if (IS_ERR(task))
5787                 ret = PTR_ERR(task);
5788         else
5789                 rpc_put_task_async(task);
5790         dprintk("<-- %s status=%d\n", __func__, ret);
5791         return ret;
5792 }
5793
5794 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5795 {
5796         struct rpc_task *task;
5797         int ret;
5798
5799         task = _nfs41_proc_sequence(clp, cred);
5800         if (IS_ERR(task)) {
5801                 ret = PTR_ERR(task);
5802                 goto out;
5803         }
5804         ret = rpc_wait_for_completion_task(task);
5805         if (!ret) {
5806                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5807
5808                 if (task->tk_status == 0)
5809                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5810                 ret = task->tk_status;
5811         }
5812         rpc_put_task(task);
5813 out:
5814         dprintk("<-- %s status=%d\n", __func__, ret);
5815         return ret;
5816 }
5817
5818 struct nfs4_reclaim_complete_data {
5819         struct nfs_client *clp;
5820         struct nfs41_reclaim_complete_args arg;
5821         struct nfs41_reclaim_complete_res res;
5822 };
5823
5824 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5825 {
5826         struct nfs4_reclaim_complete_data *calldata = data;
5827
5828         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5829         if (nfs41_setup_sequence(calldata->clp->cl_session,
5830                                 &calldata->arg.seq_args,
5831                                 &calldata->res.seq_res, task))
5832                 return;
5833
5834         rpc_call_start(task);
5835 }
5836
5837 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5838 {
5839         switch(task->tk_status) {
5840         case 0:
5841         case -NFS4ERR_COMPLETE_ALREADY:
5842         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5843                 break;
5844         case -NFS4ERR_DELAY:
5845                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5846                 /* fall through */
5847         case -NFS4ERR_RETRY_UNCACHED_REP:
5848                 return -EAGAIN;
5849         default:
5850                 nfs4_schedule_lease_recovery(clp);
5851         }
5852         return 0;
5853 }
5854
5855 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5856 {
5857         struct nfs4_reclaim_complete_data *calldata = data;
5858         struct nfs_client *clp = calldata->clp;
5859         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5860
5861         dprintk("--> %s\n", __func__);
5862         if (!nfs41_sequence_done(task, res))
5863                 return;
5864
5865         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5866                 rpc_restart_call_prepare(task);
5867                 return;
5868         }
5869         dprintk("<-- %s\n", __func__);
5870 }
5871
5872 static void nfs4_free_reclaim_complete_data(void *data)
5873 {
5874         struct nfs4_reclaim_complete_data *calldata = data;
5875
5876         kfree(calldata);
5877 }
5878
5879 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5880         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5881         .rpc_call_done = nfs4_reclaim_complete_done,
5882         .rpc_release = nfs4_free_reclaim_complete_data,
5883 };
5884
5885 /*
5886  * Issue a global reclaim complete.
5887  */
5888 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5889 {
5890         struct nfs4_reclaim_complete_data *calldata;
5891         struct rpc_task *task;
5892         struct rpc_message msg = {
5893                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5894         };
5895         struct rpc_task_setup task_setup_data = {
5896                 .rpc_client = clp->cl_rpcclient,
5897                 .rpc_message = &msg,
5898                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5899                 .flags = RPC_TASK_ASYNC,
5900         };
5901         int status = -ENOMEM;
5902
5903         dprintk("--> %s\n", __func__);
5904         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5905         if (calldata == NULL)
5906                 goto out;
5907         calldata->clp = clp;
5908         calldata->arg.one_fs = 0;
5909
5910         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5911         msg.rpc_argp = &calldata->arg;
5912         msg.rpc_resp = &calldata->res;
5913         task_setup_data.callback_data = calldata;
5914         task = rpc_run_task(&task_setup_data);
5915         if (IS_ERR(task)) {
5916                 status = PTR_ERR(task);
5917                 goto out;
5918         }
5919         status = nfs4_wait_for_completion_rpc_task(task);
5920         if (status == 0)
5921                 status = task->tk_status;
5922         rpc_put_task(task);
5923         return 0;
5924 out:
5925         dprintk("<-- %s status=%d\n", __func__, status);
5926         return status;
5927 }
5928
5929 static void
5930 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5931 {
5932         struct nfs4_layoutget *lgp = calldata;
5933         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5934
5935         dprintk("--> %s\n", __func__);
5936         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5937          * right now covering the LAYOUTGET we are about to send.
5938          * However, that is not so catastrophic, and there seems
5939          * to be no way to prevent it completely.
5940          */
5941         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5942                                 &lgp->res.seq_res, task))
5943                 return;
5944         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5945                                           NFS_I(lgp->args.inode)->layout,
5946                                           lgp->args.ctx->state)) {
5947                 rpc_exit(task, NFS4_OK);
5948                 return;
5949         }
5950         rpc_call_start(task);
5951 }
5952
5953 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5954 {
5955         struct nfs4_layoutget *lgp = calldata;
5956         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5957
5958         dprintk("--> %s\n", __func__);
5959
5960         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5961                 return;
5962
5963         switch (task->tk_status) {
5964         case 0:
5965                 break;
5966         case -NFS4ERR_LAYOUTTRYLATER:
5967         case -NFS4ERR_RECALLCONFLICT:
5968                 task->tk_status = -NFS4ERR_DELAY;
5969                 /* Fall through */
5970         default:
5971                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5972                         rpc_restart_call_prepare(task);
5973                         return;
5974                 }
5975         }
5976         dprintk("<-- %s\n", __func__);
5977 }
5978
5979 static void nfs4_layoutget_release(void *calldata)
5980 {
5981         struct nfs4_layoutget *lgp = calldata;
5982
5983         dprintk("--> %s\n", __func__);
5984         put_nfs_open_context(lgp->args.ctx);
5985         kfree(calldata);
5986         dprintk("<-- %s\n", __func__);
5987 }
5988
5989 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5990         .rpc_call_prepare = nfs4_layoutget_prepare,
5991         .rpc_call_done = nfs4_layoutget_done,
5992         .rpc_release = nfs4_layoutget_release,
5993 };
5994
5995 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5996 {
5997         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5998         struct rpc_task *task;
5999         struct rpc_message msg = {
6000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6001                 .rpc_argp = &lgp->args,
6002                 .rpc_resp = &lgp->res,
6003         };
6004         struct rpc_task_setup task_setup_data = {
6005                 .rpc_client = server->client,
6006                 .rpc_message = &msg,
6007                 .callback_ops = &nfs4_layoutget_call_ops,
6008                 .callback_data = lgp,
6009                 .flags = RPC_TASK_ASYNC,
6010         };
6011         int status = 0;
6012
6013         dprintk("--> %s\n", __func__);
6014
6015         lgp->res.layoutp = &lgp->args.layout;
6016         lgp->res.seq_res.sr_slot = NULL;
6017         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6018         task = rpc_run_task(&task_setup_data);
6019         if (IS_ERR(task))
6020                 return PTR_ERR(task);
6021         status = nfs4_wait_for_completion_rpc_task(task);
6022         if (status == 0)
6023                 status = task->tk_status;
6024         if (status == 0)
6025                 status = pnfs_layout_process(lgp);
6026         rpc_put_task(task);
6027         dprintk("<-- %s status=%d\n", __func__, status);
6028         return status;
6029 }
6030
6031 static void
6032 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6033 {
6034         struct nfs4_layoutreturn *lrp = calldata;
6035
6036         dprintk("--> %s\n", __func__);
6037         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6038                                 &lrp->res.seq_res, task))
6039                 return;
6040         rpc_call_start(task);
6041 }
6042
6043 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6044 {
6045         struct nfs4_layoutreturn *lrp = calldata;
6046         struct nfs_server *server;
6047         struct pnfs_layout_hdr *lo = lrp->args.layout;
6048
6049         dprintk("--> %s\n", __func__);
6050
6051         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6052                 return;
6053
6054         server = NFS_SERVER(lrp->args.inode);
6055         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6056                 rpc_restart_call_prepare(task);
6057                 return;
6058         }
6059         spin_lock(&lo->plh_inode->i_lock);
6060         if (task->tk_status == 0) {
6061                 if (lrp->res.lrs_present) {
6062                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6063                 } else
6064                         BUG_ON(!list_empty(&lo->plh_segs));
6065         }
6066         lo->plh_block_lgets--;
6067         spin_unlock(&lo->plh_inode->i_lock);
6068         dprintk("<-- %s\n", __func__);
6069 }
6070
6071 static void nfs4_layoutreturn_release(void *calldata)
6072 {
6073         struct nfs4_layoutreturn *lrp = calldata;
6074
6075         dprintk("--> %s\n", __func__);
6076         put_layout_hdr(lrp->args.layout);
6077         kfree(calldata);
6078         dprintk("<-- %s\n", __func__);
6079 }
6080
6081 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6082         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6083         .rpc_call_done = nfs4_layoutreturn_done,
6084         .rpc_release = nfs4_layoutreturn_release,
6085 };
6086
6087 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6088 {
6089         struct rpc_task *task;
6090         struct rpc_message msg = {
6091                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6092                 .rpc_argp = &lrp->args,
6093                 .rpc_resp = &lrp->res,
6094         };
6095         struct rpc_task_setup task_setup_data = {
6096                 .rpc_client = lrp->clp->cl_rpcclient,
6097                 .rpc_message = &msg,
6098                 .callback_ops = &nfs4_layoutreturn_call_ops,
6099                 .callback_data = lrp,
6100         };
6101         int status;
6102
6103         dprintk("--> %s\n", __func__);
6104         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6105         task = rpc_run_task(&task_setup_data);
6106         if (IS_ERR(task))
6107                 return PTR_ERR(task);
6108         status = task->tk_status;
6109         dprintk("<-- %s status=%d\n", __func__, status);
6110         rpc_put_task(task);
6111         return status;
6112 }
6113
6114 /*
6115  * Retrieve the list of Data Server devices from the MDS.
6116  */
6117 static int _nfs4_getdevicelist(struct nfs_server *server,
6118                                     const struct nfs_fh *fh,
6119                                     struct pnfs_devicelist *devlist)
6120 {
6121         struct nfs4_getdevicelist_args args = {
6122                 .fh = fh,
6123                 .layoutclass = server->pnfs_curr_ld->id,
6124         };
6125         struct nfs4_getdevicelist_res res = {
6126                 .devlist = devlist,
6127         };
6128         struct rpc_message msg = {
6129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6130                 .rpc_argp = &args,
6131                 .rpc_resp = &res,
6132         };
6133         int status;
6134
6135         dprintk("--> %s\n", __func__);
6136         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6137                                 &res.seq_res, 0);
6138         dprintk("<-- %s status=%d\n", __func__, status);
6139         return status;
6140 }
6141
6142 int nfs4_proc_getdevicelist(struct nfs_server *server,
6143                             const struct nfs_fh *fh,
6144                             struct pnfs_devicelist *devlist)
6145 {
6146         struct nfs4_exception exception = { };
6147         int err;
6148
6149         do {
6150                 err = nfs4_handle_exception(server,
6151                                 _nfs4_getdevicelist(server, fh, devlist),
6152                                 &exception);
6153         } while (exception.retry);
6154
6155         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6156                 err, devlist->num_devs);
6157
6158         return err;
6159 }
6160 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6161
6162 static int
6163 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6164 {
6165         struct nfs4_getdeviceinfo_args args = {
6166                 .pdev = pdev,
6167         };
6168         struct nfs4_getdeviceinfo_res res = {
6169                 .pdev = pdev,
6170         };
6171         struct rpc_message msg = {
6172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6173                 .rpc_argp = &args,
6174                 .rpc_resp = &res,
6175         };
6176         int status;
6177
6178         dprintk("--> %s\n", __func__);
6179         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6180         dprintk("<-- %s status=%d\n", __func__, status);
6181
6182         return status;
6183 }
6184
6185 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6186 {
6187         struct nfs4_exception exception = { };
6188         int err;
6189
6190         do {
6191                 err = nfs4_handle_exception(server,
6192                                         _nfs4_proc_getdeviceinfo(server, pdev),
6193                                         &exception);
6194         } while (exception.retry);
6195         return err;
6196 }
6197 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6198
6199 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6200 {
6201         struct nfs4_layoutcommit_data *data = calldata;
6202         struct nfs_server *server = NFS_SERVER(data->args.inode);
6203
6204         if (nfs4_setup_sequence(server, &data->args.seq_args,
6205                                 &data->res.seq_res, task))
6206                 return;
6207         rpc_call_start(task);
6208 }
6209
6210 static void
6211 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6212 {
6213         struct nfs4_layoutcommit_data *data = calldata;
6214         struct nfs_server *server = NFS_SERVER(data->args.inode);
6215
6216         if (!nfs4_sequence_done(task, &data->res.seq_res))
6217                 return;
6218
6219         switch (task->tk_status) { /* Just ignore these failures */
6220         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6221         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6222         case -NFS4ERR_BADLAYOUT:     /* no layout */
6223         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6224                 task->tk_status = 0;
6225                 break;
6226         case 0:
6227                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6228                                                    data->res.fattr);
6229                 break;
6230         default:
6231                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6232                         rpc_restart_call_prepare(task);
6233                         return;
6234                 }
6235         }
6236 }
6237
6238 static void nfs4_layoutcommit_release(void *calldata)
6239 {
6240         struct nfs4_layoutcommit_data *data = calldata;
6241         struct pnfs_layout_segment *lseg, *tmp;
6242         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6243
6244         pnfs_cleanup_layoutcommit(data);
6245         /* Matched by references in pnfs_set_layoutcommit */
6246         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6247                 list_del_init(&lseg->pls_lc_list);
6248                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6249                                        &lseg->pls_flags))
6250                         put_lseg(lseg);
6251         }
6252
6253         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6254         smp_mb__after_clear_bit();
6255         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6256
6257         put_rpccred(data->cred);
6258         kfree(data);
6259 }
6260
6261 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6262         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6263         .rpc_call_done = nfs4_layoutcommit_done,
6264         .rpc_release = nfs4_layoutcommit_release,
6265 };
6266
6267 int
6268 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6269 {
6270         struct rpc_message msg = {
6271                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6272                 .rpc_argp = &data->args,
6273                 .rpc_resp = &data->res,
6274                 .rpc_cred = data->cred,
6275         };
6276         struct rpc_task_setup task_setup_data = {
6277                 .task = &data->task,
6278                 .rpc_client = NFS_CLIENT(data->args.inode),
6279                 .rpc_message = &msg,
6280                 .callback_ops = &nfs4_layoutcommit_ops,
6281                 .callback_data = data,
6282                 .flags = RPC_TASK_ASYNC,
6283         };
6284         struct rpc_task *task;
6285         int status = 0;
6286
6287         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6288                 "lbw: %llu inode %lu\n",
6289                 data->task.tk_pid, sync,
6290                 data->args.lastbytewritten,
6291                 data->args.inode->i_ino);
6292
6293         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6294         task = rpc_run_task(&task_setup_data);
6295         if (IS_ERR(task))
6296                 return PTR_ERR(task);
6297         if (sync == false)
6298                 goto out;
6299         status = nfs4_wait_for_completion_rpc_task(task);
6300         if (status != 0)
6301                 goto out;
6302         status = task->tk_status;
6303 out:
6304         dprintk("%s: status %d\n", __func__, status);
6305         rpc_put_task(task);
6306         return status;
6307 }
6308
6309 static int
6310 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6311                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6312 {
6313         struct nfs41_secinfo_no_name_args args = {
6314                 .style = SECINFO_STYLE_CURRENT_FH,
6315         };
6316         struct nfs4_secinfo_res res = {
6317                 .flavors = flavors,
6318         };
6319         struct rpc_message msg = {
6320                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6321                 .rpc_argp = &args,
6322                 .rpc_resp = &res,
6323         };
6324         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6325 }
6326
6327 static int
6328 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6329                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6330 {
6331         struct nfs4_exception exception = { };
6332         int err;
6333         do {
6334                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6335                 switch (err) {
6336                 case 0:
6337                 case -NFS4ERR_WRONGSEC:
6338                 case -NFS4ERR_NOTSUPP:
6339                         goto out;
6340                 default:
6341                         err = nfs4_handle_exception(server, err, &exception);
6342                 }
6343         } while (exception.retry);
6344 out:
6345         return err;
6346 }
6347
6348 static int
6349 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6350                     struct nfs_fsinfo *info)
6351 {
6352         int err;
6353         struct page *page;
6354         rpc_authflavor_t flavor;
6355         struct nfs4_secinfo_flavors *flavors;
6356
6357         page = alloc_page(GFP_KERNEL);
6358         if (!page) {
6359                 err = -ENOMEM;
6360                 goto out;
6361         }
6362
6363         flavors = page_address(page);
6364         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6365
6366         /*
6367          * Fall back on "guess and check" method if
6368          * the server doesn't support SECINFO_NO_NAME
6369          */
6370         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6371                 err = nfs4_find_root_sec(server, fhandle, info);
6372                 goto out_freepage;
6373         }
6374         if (err)
6375                 goto out_freepage;
6376
6377         flavor = nfs_find_best_sec(flavors);
6378         if (err == 0)
6379                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6380
6381 out_freepage:
6382         put_page(page);
6383         if (err == -EACCES)
6384                 return -EPERM;
6385 out:
6386         return err;
6387 }
6388
6389 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6390 {
6391         int status;
6392         struct nfs41_test_stateid_args args = {
6393                 .stateid = stateid,
6394         };
6395         struct nfs41_test_stateid_res res;
6396         struct rpc_message msg = {
6397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6398                 .rpc_argp = &args,
6399                 .rpc_resp = &res,
6400         };
6401
6402         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6403         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6404
6405         if (status == NFS_OK)
6406                 return res.status;
6407         return status;
6408 }
6409
6410 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6411 {
6412         struct nfs4_exception exception = { };
6413         int err;
6414         do {
6415                 err = nfs4_handle_exception(server,
6416                                 _nfs41_test_stateid(server, stateid),
6417                                 &exception);
6418         } while (exception.retry);
6419         return err;
6420 }
6421
6422 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6423 {
6424         struct nfs41_free_stateid_args args = {
6425                 .stateid = stateid,
6426         };
6427         struct nfs41_free_stateid_res res;
6428         struct rpc_message msg = {
6429                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6430                 .rpc_argp = &args,
6431                 .rpc_resp = &res,
6432         };
6433
6434         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6435         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6436 }
6437
6438 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6439 {
6440         struct nfs4_exception exception = { };
6441         int err;
6442         do {
6443                 err = nfs4_handle_exception(server,
6444                                 _nfs4_free_stateid(server, stateid),
6445                                 &exception);
6446         } while (exception.retry);
6447         return err;
6448 }
6449
6450 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6451                 const nfs4_stateid *s2)
6452 {
6453         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6454                 return false;
6455
6456         if (s1->seqid == s2->seqid)
6457                 return true;
6458         if (s1->seqid == 0 || s2->seqid == 0)
6459                 return true;
6460
6461         return false;
6462 }
6463
6464 #endif /* CONFIG_NFS_V4_1 */
6465
6466 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6467                 const nfs4_stateid *s2)
6468 {
6469         return nfs4_stateid_match(s1, s2);
6470 }
6471
6472
6473 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6474         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6475         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6476         .recover_open   = nfs4_open_reclaim,
6477         .recover_lock   = nfs4_lock_reclaim,
6478         .establish_clid = nfs4_init_clientid,
6479         .get_clid_cred  = nfs4_get_setclientid_cred,
6480 };
6481
6482 #if defined(CONFIG_NFS_V4_1)
6483 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6484         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6485         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6486         .recover_open   = nfs4_open_reclaim,
6487         .recover_lock   = nfs4_lock_reclaim,
6488         .establish_clid = nfs41_init_clientid,
6489         .get_clid_cred  = nfs4_get_exchange_id_cred,
6490         .reclaim_complete = nfs41_proc_reclaim_complete,
6491 };
6492 #endif /* CONFIG_NFS_V4_1 */
6493
6494 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6495         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6496         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6497         .recover_open   = nfs4_open_expired,
6498         .recover_lock   = nfs4_lock_expired,
6499         .establish_clid = nfs4_init_clientid,
6500         .get_clid_cred  = nfs4_get_setclientid_cred,
6501 };
6502
6503 #if defined(CONFIG_NFS_V4_1)
6504 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6505         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6506         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6507         .recover_open   = nfs41_open_expired,
6508         .recover_lock   = nfs41_lock_expired,
6509         .establish_clid = nfs41_init_clientid,
6510         .get_clid_cred  = nfs4_get_exchange_id_cred,
6511 };
6512 #endif /* CONFIG_NFS_V4_1 */
6513
6514 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6515         .sched_state_renewal = nfs4_proc_async_renew,
6516         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6517         .renew_lease = nfs4_proc_renew,
6518 };
6519
6520 #if defined(CONFIG_NFS_V4_1)
6521 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6522         .sched_state_renewal = nfs41_proc_async_sequence,
6523         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6524         .renew_lease = nfs4_proc_sequence,
6525 };
6526 #endif
6527
6528 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6529         .minor_version = 0,
6530         .call_sync = _nfs4_call_sync,
6531         .match_stateid = nfs4_match_stateid,
6532         .find_root_sec = nfs4_find_root_sec,
6533         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6534         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6535         .state_renewal_ops = &nfs40_state_renewal_ops,
6536 };
6537
6538 #if defined(CONFIG_NFS_V4_1)
6539 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6540         .minor_version = 1,
6541         .call_sync = _nfs4_call_sync_session,
6542         .match_stateid = nfs41_match_stateid,
6543         .find_root_sec = nfs41_find_root_sec,
6544         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6545         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6546         .state_renewal_ops = &nfs41_state_renewal_ops,
6547 };
6548 #endif
6549
6550 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6551         [0] = &nfs_v4_0_minor_ops,
6552 #if defined(CONFIG_NFS_V4_1)
6553         [1] = &nfs_v4_1_minor_ops,
6554 #endif
6555 };
6556
6557 static const struct inode_operations nfs4_file_inode_operations = {
6558         .permission     = nfs_permission,
6559         .getattr        = nfs_getattr,
6560         .setattr        = nfs_setattr,
6561         .getxattr       = generic_getxattr,
6562         .setxattr       = generic_setxattr,
6563         .listxattr      = generic_listxattr,
6564         .removexattr    = generic_removexattr,
6565 };
6566
6567 const struct nfs_rpc_ops nfs_v4_clientops = {
6568         .version        = 4,                    /* protocol version */
6569         .dentry_ops     = &nfs4_dentry_operations,
6570         .dir_inode_ops  = &nfs4_dir_inode_operations,
6571         .file_inode_ops = &nfs4_file_inode_operations,
6572         .file_ops       = &nfs4_file_operations,
6573         .getroot        = nfs4_proc_get_root,
6574         .getattr        = nfs4_proc_getattr,
6575         .setattr        = nfs4_proc_setattr,
6576         .lookup         = nfs4_proc_lookup,
6577         .access         = nfs4_proc_access,
6578         .readlink       = nfs4_proc_readlink,
6579         .create         = nfs4_proc_create,
6580         .remove         = nfs4_proc_remove,
6581         .unlink_setup   = nfs4_proc_unlink_setup,
6582         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6583         .unlink_done    = nfs4_proc_unlink_done,
6584         .rename         = nfs4_proc_rename,
6585         .rename_setup   = nfs4_proc_rename_setup,
6586         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6587         .rename_done    = nfs4_proc_rename_done,
6588         .link           = nfs4_proc_link,
6589         .symlink        = nfs4_proc_symlink,
6590         .mkdir          = nfs4_proc_mkdir,
6591         .rmdir          = nfs4_proc_remove,
6592         .readdir        = nfs4_proc_readdir,
6593         .mknod          = nfs4_proc_mknod,
6594         .statfs         = nfs4_proc_statfs,
6595         .fsinfo         = nfs4_proc_fsinfo,
6596         .pathconf       = nfs4_proc_pathconf,
6597         .set_capabilities = nfs4_server_capabilities,
6598         .decode_dirent  = nfs4_decode_dirent,
6599         .read_setup     = nfs4_proc_read_setup,
6600         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6601         .read_done      = nfs4_read_done,
6602         .write_setup    = nfs4_proc_write_setup,
6603         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6604         .write_done     = nfs4_write_done,
6605         .commit_setup   = nfs4_proc_commit_setup,
6606         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6607         .commit_done    = nfs4_commit_done,
6608         .lock           = nfs4_proc_lock,
6609         .clear_acl_cache = nfs4_zap_acl_attr,
6610         .close_context  = nfs4_close_context,
6611         .open_context   = nfs4_atomic_open,
6612         .init_client    = nfs4_init_client,
6613         .secinfo        = nfs4_proc_secinfo,
6614 };
6615
6616 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6617         .prefix = XATTR_NAME_NFSV4_ACL,
6618         .list   = nfs4_xattr_list_nfs4_acl,
6619         .get    = nfs4_xattr_get_nfs4_acl,
6620         .set    = nfs4_xattr_set_nfs4_acl,
6621 };
6622
6623 const struct xattr_handler *nfs4_xattr_handlers[] = {
6624         &nfs4_xattr_nfs4_acl_handler,
6625         NULL
6626 };
6627
6628 module_param(max_session_slots, ushort, 0644);
6629 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6630                 "requests the client will negotiate");
6631
6632 /*
6633  * Local variables:
6634  *  c-basic-offset: 8
6635  * End:
6636  */