fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/sunrpc/bc_xprt.h>
  56 #include <linux/xattr.h>
  57 #include <linux/utsname.h>
  58 #include <linux/freezer.h>
  59
  60 #include "nfs4_fs.h"
  61 #include "delegation.h"
  62 #include "internal.h"
  63 #include "iostat.h"
  64 #include "callback.h"
  65 #include "pnfs.h"
  66 #include "netns.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 *, struct nfs_fh *, struct nfs_fattr *);
  84 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  85 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  86                             struct nfs_fattr *fattr, struct iattr *sattr,
  87                             struct nfs4_state *state);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  90 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  91 #endif
  92 /* Prevent leaks of NFSv4 errors into userland */
  93 static int nfs4_map_errors(int err)
  94 {
  95         if (err >= -1000)
  96                 return err;
  97         switch (err) {
  98         case -NFS4ERR_RESOURCE:
  99                 return -EREMOTEIO;
 100         case -NFS4ERR_WRONGSEC:
 101                 return -EPERM;
 102         case -NFS4ERR_BADOWNER:
 103         case -NFS4ERR_BADNAME:
 104                 return -EINVAL;
 105         case -NFS4ERR_SHARE_DENIED:
 106                 return -EACCES;
 107         case -NFS4ERR_MINOR_VERS_MISMATCH:
 108                 return -EPROTONOSUPPORT;
 109         default:
 110                 dprintk("%s could not handle NFSv4 error %d\n",
 111                                 __func__, -err);
 112                 break;
 113         }
 114         return -EIO;
 115 }
 116
 117 /*
 118  * This is our standard bitmap for GETATTR requests.
 119  */
 120 const u32 nfs4_fattr_bitmap[3] = {
 121         FATTR4_WORD0_TYPE
 122         | FATTR4_WORD0_CHANGE
 123         | FATTR4_WORD0_SIZE
 124         | FATTR4_WORD0_FSID
 125         | FATTR4_WORD0_FILEID,
 126         FATTR4_WORD1_MODE
 127         | FATTR4_WORD1_NUMLINKS
 128         | FATTR4_WORD1_OWNER
 129         | FATTR4_WORD1_OWNER_GROUP
 130         | FATTR4_WORD1_RAWDEV
 131         | FATTR4_WORD1_SPACE_USED
 132         | FATTR4_WORD1_TIME_ACCESS
 133         | FATTR4_WORD1_TIME_METADATA
 134         | FATTR4_WORD1_TIME_MODIFY
 135 };
 136
 137 static const u32 nfs4_pnfs_open_bitmap[3] = {
 138         FATTR4_WORD0_TYPE
 139         | FATTR4_WORD0_CHANGE
 140         | FATTR4_WORD0_SIZE
 141         | FATTR4_WORD0_FSID
 142         | FATTR4_WORD0_FILEID,
 143         FATTR4_WORD1_MODE
 144         | FATTR4_WORD1_NUMLINKS
 145         | FATTR4_WORD1_OWNER
 146         | FATTR4_WORD1_OWNER_GROUP
 147         | FATTR4_WORD1_RAWDEV
 148         | FATTR4_WORD1_SPACE_USED
 149         | FATTR4_WORD1_TIME_ACCESS
 150         | FATTR4_WORD1_TIME_METADATA
 151         | FATTR4_WORD1_TIME_MODIFY,
 152         FATTR4_WORD2_MDSTHRESHOLD
 153 };
 154
 155 const u32 nfs4_statfs_bitmap[2] = {
 156         FATTR4_WORD0_FILES_AVAIL
 157         | FATTR4_WORD0_FILES_FREE
 158         | FATTR4_WORD0_FILES_TOTAL,
 159         FATTR4_WORD1_SPACE_AVAIL
 160         | FATTR4_WORD1_SPACE_FREE
 161         | FATTR4_WORD1_SPACE_TOTAL
 162 };
 163
 164 const u32 nfs4_pathconf_bitmap[2] = {
 165         FATTR4_WORD0_MAXLINK
 166         | FATTR4_WORD0_MAXNAME,
 167         0
 168 };
 169
 170 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 171                         | FATTR4_WORD0_MAXREAD
 172                         | FATTR4_WORD0_MAXWRITE
 173                         | FATTR4_WORD0_LEASE_TIME,
 174                         FATTR4_WORD1_TIME_DELTA
 175                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 176                         FATTR4_WORD2_LAYOUT_BLKSIZE
 177 };
 178
 179 const u32 nfs4_fs_locations_bitmap[2] = {
 180         FATTR4_WORD0_TYPE
 181         | FATTR4_WORD0_CHANGE
 182         | FATTR4_WORD0_SIZE
 183         | FATTR4_WORD0_FSID
 184         | FATTR4_WORD0_FILEID
 185         | FATTR4_WORD0_FS_LOCATIONS,
 186         FATTR4_WORD1_MODE
 187         | FATTR4_WORD1_NUMLINKS
 188         | FATTR4_WORD1_OWNER
 189         | FATTR4_WORD1_OWNER_GROUP
 190         | FATTR4_WORD1_RAWDEV
 191         | FATTR4_WORD1_SPACE_USED
 192         | FATTR4_WORD1_TIME_ACCESS
 193         | FATTR4_WORD1_TIME_METADATA
 194         | FATTR4_WORD1_TIME_MODIFY
 195         | FATTR4_WORD1_MOUNTED_ON_FILEID
 196 };
 197
 198 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 199                 struct nfs4_readdir_arg *readdir)
 200 {
 201         __be32 *start, *p;
 202
 203         BUG_ON(readdir->count < 80);
 204         if (cookie > 2) {
 205                 readdir->cookie = cookie;
 206                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 207                 return;
 208         }
 209
 210         readdir->cookie = 0;
 211         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 212         if (cookie == 2)
 213                 return;
 214
 215         /*
 216          * NFSv4 servers do not return entries for '.' and '..'
 217          * Therefore, we fake these entries here.  We let '.'
 218          * have cookie 0 and '..' have cookie 1.  Note that
 219          * when talking to the server, we always send cookie 0
 220          * instead of 1 or 2.
 221          */
 222         start = p = kmap_atomic(*readdir->pages);
 223
 224         if (cookie == 0) {
 225                 *p++ = xdr_one;                                  /* next */
 226                 *p++ = xdr_zero;                   /* cookie, first word */
 227                 *p++ = xdr_one;                   /* cookie, second word */
 228                 *p++ = xdr_one;                             /* entry len */
 229                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 230                 p++;
 231                 *p++ = xdr_one;                         /* bitmap length */
 232                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 233                 *p++ = htonl(8);              /* attribute buffer length */
 234                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 235         }
 236
 237         *p++ = xdr_one;                                  /* next */
 238         *p++ = xdr_zero;                   /* cookie, first word */
 239         *p++ = xdr_two;                   /* cookie, second word */
 240         *p++ = xdr_two;                             /* entry len */
 241         memcpy(p, "..\0\0", 4);                         /* entry */
 242         p++;
 243         *p++ = xdr_one;                         /* bitmap length */
 244         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 245         *p++ = htonl(8);              /* attribute buffer length */
 246         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 247
 248         readdir->pgbase = (char *)p - (char *)start;
 249         readdir->count -= readdir->pgbase;
 250         kunmap_atomic(start);
 251 }
 252
 253 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 254 {
 255         int res;
 256
 257         might_sleep();
 258
 259         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 260                         nfs_wait_bit_killable, TASK_KILLABLE);
 261         return res;
 262 }
 263
 264 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 265 {
 266         int res = 0;
 267
 268         might_sleep();
 269
 270         if (*timeout <= 0)
 271                 *timeout = NFS4_POLL_RETRY_MIN;
 272         if (*timeout > NFS4_POLL_RETRY_MAX)
 273                 *timeout = NFS4_POLL_RETRY_MAX;
 274         freezable_schedule_timeout_killable(*timeout);
 275         if (fatal_signal_pending(current))
 276                 res = -ERESTARTSYS;
 277         *timeout <<= 1;
 278         return res;
 279 }
 280
 281 /* This is the error handling routine for processes that are allowed
 282  * to sleep.
 283  */
 284 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 285 {
 286         struct nfs_client *clp = server->nfs_client;
 287         struct nfs4_state *state = exception->state;
 288         struct inode *inode = exception->inode;
 289         int ret = errorcode;
 290
 291         exception->retry = 0;
 292         switch(errorcode) {
 293                 case 0:
 294                         return 0;
 295                 case -NFS4ERR_OPENMODE:
 296                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 297                                 nfs4_inode_return_delegation(inode);
 298                                 exception->retry = 1;
 299                                 return 0;
 300                         }
 301                         if (state == NULL)
 302                                 break;
 303                         nfs4_schedule_stateid_recovery(server, state);
 304                         goto wait_on_recovery;
 305                 case -NFS4ERR_DELEG_REVOKED:
 306                 case -NFS4ERR_ADMIN_REVOKED:
 307                 case -NFS4ERR_BAD_STATEID:
 308                         if (state == NULL)
 309                                 break;
 310                         nfs_remove_bad_delegation(state->inode);
 311                         nfs4_schedule_stateid_recovery(server, state);
 312                         goto wait_on_recovery;
 313                 case -NFS4ERR_EXPIRED:
 314                         if (state != NULL)
 315                                 nfs4_schedule_stateid_recovery(server, state);
 316                 case -NFS4ERR_STALE_STATEID:
 317                 case -NFS4ERR_STALE_CLIENTID:
 318                         nfs4_schedule_lease_recovery(clp);
 319                         goto wait_on_recovery;
 320 #if defined(CONFIG_NFS_V4_1)
 321                 case -NFS4ERR_BADSESSION:
 322                 case -NFS4ERR_BADSLOT:
 323                 case -NFS4ERR_BAD_HIGH_SLOT:
 324                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 325                 case -NFS4ERR_DEADSESSION:
 326                 case -NFS4ERR_SEQ_FALSE_RETRY:
 327                 case -NFS4ERR_SEQ_MISORDERED:
 328                         dprintk("%s ERROR: %d Reset session\n", __func__,
 329                                 errorcode);
 330                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 331                         exception->retry = 1;
 332                         break;
 333 #endif /* defined(CONFIG_NFS_V4_1) */
 334                 case -NFS4ERR_FILE_OPEN:
 335                         if (exception->timeout > HZ) {
 336                                 /* We have retried a decent amount, time to
 337                                  * fail
 338                                  */
 339                                 ret = -EBUSY;
 340                                 break;
 341                         }
 342                 case -NFS4ERR_GRACE:
 343                 case -NFS4ERR_DELAY:
 344                 case -EKEYEXPIRED:
 345                         ret = nfs4_delay(server->client, &exception->timeout);
 346                         if (ret != 0)
 347                                 break;
 348                 case -NFS4ERR_RETRY_UNCACHED_REP:
 349                 case -NFS4ERR_OLD_STATEID:
 350                         exception->retry = 1;
 351                         break;
 352                 case -NFS4ERR_BADOWNER:
 353                         /* The following works around a Linux server bug! */
 354                 case -NFS4ERR_BADNAME:
 355                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 356                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 357                                 exception->retry = 1;
 358                                 printk(KERN_WARNING "NFS: v4 server %s "
 359                                                 "does not accept raw "
 360                                                 "uid/gids. "
 361                                                 "Reenabling the idmapper.\n",
 362                                                 server->nfs_client->cl_hostname);
 363                         }
 364         }
 365         /* We failed to handle the error */
 366         return nfs4_map_errors(ret);
 367 wait_on_recovery:
 368         ret = nfs4_wait_clnt_recover(clp);
 369         if (ret == 0)
 370                 exception->retry = 1;
 371         return ret;
 372 }
 373
 374
 375 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 376 {
 377         spin_lock(&clp->cl_lock);
 378         if (time_before(clp->cl_last_renewal,timestamp))
 379                 clp->cl_last_renewal = timestamp;
 380         spin_unlock(&clp->cl_lock);
 381 }
 382
 383 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 384 {
 385         do_renew_lease(server->nfs_client, timestamp);
 386 }
 387
 388 #if defined(CONFIG_NFS_V4_1)
 389
 390 /*
 391  * nfs4_free_slot - free a slot and efficiently update slot table.
 392  *
 393  * freeing a slot is trivially done by clearing its respective bit
 394  * in the bitmap.
 395  * If the freed slotid equals highest_used_slotid we want to update it
 396  * so that the server would be able to size down the slot table if needed,
 397  * otherwise we know that the highest_used_slotid is still in use.
 398  * When updating highest_used_slotid there may be "holes" in the bitmap
 399  * so we need to scan down from highest_used_slotid to 0 looking for the now
 400  * highest slotid in use.
 401  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 402  *
 403  * Must be called while holding tbl->slot_tbl_lock
 404  */
 405 static void
 406 nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
 407 {
 408         BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
 409         /* clear used bit in bitmap */
 410         __clear_bit(slotid, tbl->used_slots);
 411
 412         /* update highest_used_slotid when it is freed */
 413         if (slotid == tbl->highest_used_slotid) {
 414                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 415                 if (slotid < tbl->max_slots)
 416                         tbl->highest_used_slotid = slotid;
 417                 else
 418                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 419         }
 420         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 421                 slotid, tbl->highest_used_slotid);
 422 }
 423
 424 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 425 {
 426         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 427         return true;
 428 }
 429
 430 /*
 431  * Signal state manager thread if session fore channel is drained
 432  */
 433 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 434 {
 435         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 436                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 437                                 nfs4_set_task_privileged, NULL);
 438                 return;
 439         }
 440
 441         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 442                 return;
 443
 444         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 445         complete(&ses->fc_slot_table.complete);
 446 }
 447
 448 /*
 449  * Signal state manager thread if session back channel is drained
 450  */
 451 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 452 {
 453         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 454             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 455                 return;
 456         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 457         complete(&ses->bc_slot_table.complete);
 458 }
 459
 460 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 461 {
 462         struct nfs4_slot_table *tbl;
 463
 464         tbl = &res->sr_session->fc_slot_table;
 465         if (!res->sr_slot) {
 466                 /* just wake up the next guy waiting since
 467                  * we may have not consumed a slot after all */
 468                 dprintk("%s: No slot\n", __func__);
 469                 return;
 470         }
 471
 472         spin_lock(&tbl->slot_tbl_lock);
 473         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 474         nfs4_check_drain_fc_complete(res->sr_session);
 475         spin_unlock(&tbl->slot_tbl_lock);
 476         res->sr_slot = NULL;
 477 }
 478
 479 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 480 {
 481         unsigned long timestamp;
 482         struct nfs_client *clp;
 483
 484         /*
 485          * sr_status remains 1 if an RPC level error occurred. The server
 486          * may or may not have processed the sequence operation..
 487          * Proceed as if the server received and processed the sequence
 488          * operation.
 489          */
 490         if (res->sr_status == 1)
 491                 res->sr_status = NFS_OK;
 492
 493         /* don't increment the sequence number if the task wasn't sent */
 494         if (!RPC_WAS_SENT(task))
 495                 goto out;
 496
 497         /* Check the SEQUENCE operation status */
 498         switch (res->sr_status) {
 499         case 0:
 500                 /* Update the slot's sequence and clientid lease timer */
 501                 ++res->sr_slot->seq_nr;
 502                 timestamp = res->sr_renewal_time;
 503                 clp = res->sr_session->clp;
 504                 do_renew_lease(clp, timestamp);
 505                 /* Check sequence flags */
 506                 if (res->sr_status_flags != 0)
 507                         nfs4_schedule_lease_recovery(clp);
 508                 break;
 509         case -NFS4ERR_DELAY:
 510                 /* The server detected a resend of the RPC call and
 511                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 512                  * of RFC5661.
 513                  */
 514                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 515                         __func__,
 516                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 517                         res->sr_slot->seq_nr);
 518                 goto out_retry;
 519         default:
 520                 /* Just update the slot sequence no. */
 521                 ++res->sr_slot->seq_nr;
 522         }
 523 out:
 524         /* The session may be reset by one of the error handlers. */
 525         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 526         nfs41_sequence_free_slot(res);
 527         return 1;
 528 out_retry:
 529         if (!rpc_restart_call(task))
 530                 goto out;
 531         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 532         return 0;
 533 }
 534
 535 static int nfs4_sequence_done(struct rpc_task *task,
 536                                struct nfs4_sequence_res *res)
 537 {
 538         if (res->sr_session == NULL)
 539                 return 1;
 540         return nfs41_sequence_done(task, res);
 541 }
 542
 543 /*
 544  * nfs4_find_slot - efficiently look for a free slot
 545  *
 546  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 547  * If found, we mark the slot as used, update the highest_used_slotid,
 548  * and respectively set up the sequence operation args.
 549  * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
 550  *
 551  * Note: must be called with under the slot_tbl_lock.
 552  */
 553 static u32
 554 nfs4_find_slot(struct nfs4_slot_table *tbl)
 555 {
 556         u32 slotid;
 557         u32 ret_id = NFS4_NO_SLOT;
 558
 559         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 560                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 561                 tbl->max_slots);
 562         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 563         if (slotid >= tbl->max_slots)
 564                 goto out;
 565         __set_bit(slotid, tbl->used_slots);
 566         if (slotid > tbl->highest_used_slotid ||
 567                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 568                 tbl->highest_used_slotid = slotid;
 569         ret_id = slotid;
 570 out:
 571         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 572                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 573         return ret_id;
 574 }
 575
 576 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 577                 struct nfs4_sequence_res *res, int cache_reply)
 578 {
 579         args->sa_session = NULL;
 580         args->sa_cache_this = 0;
 581         if (cache_reply)
 582                 args->sa_cache_this = 1;
 583         res->sr_session = NULL;
 584         res->sr_slot = NULL;
 585 }
 586
 587 int nfs41_setup_sequence(struct nfs4_session *session,
 588                                 struct nfs4_sequence_args *args,
 589                                 struct nfs4_sequence_res *res,
 590                                 struct rpc_task *task)
 591 {
 592         struct nfs4_slot *slot;
 593         struct nfs4_slot_table *tbl;
 594         u32 slotid;
 595
 596         dprintk("--> %s\n", __func__);
 597         /* slot already allocated? */
 598         if (res->sr_slot != NULL)
 599                 return 0;
 600
 601         tbl = &session->fc_slot_table;
 602
 603         spin_lock(&tbl->slot_tbl_lock);
 604         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 605             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 606                 /* The state manager will wait until the slot table is empty */
 607                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 608                 spin_unlock(&tbl->slot_tbl_lock);
 609                 dprintk("%s session is draining\n", __func__);
 610                 return -EAGAIN;
 611         }
 612
 613         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 614             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 615                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 616                 spin_unlock(&tbl->slot_tbl_lock);
 617                 dprintk("%s enforce FIFO order\n", __func__);
 618                 return -EAGAIN;
 619         }
 620
 621         slotid = nfs4_find_slot(tbl);
 622         if (slotid == NFS4_NO_SLOT) {
 623                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 624                 spin_unlock(&tbl->slot_tbl_lock);
 625                 dprintk("<-- %s: no free slots\n", __func__);
 626                 return -EAGAIN;
 627         }
 628         spin_unlock(&tbl->slot_tbl_lock);
 629
 630         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 631         slot = tbl->slots + slotid;
 632         args->sa_session = session;
 633         args->sa_slotid = slotid;
 634
 635         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 636
 637         res->sr_session = session;
 638         res->sr_slot = slot;
 639         res->sr_renewal_time = jiffies;
 640         res->sr_status_flags = 0;
 641         /*
 642          * sr_status is only set in decode_sequence, and so will remain
 643          * set to 1 if an rpc level failure occurs.
 644          */
 645         res->sr_status = 1;
 646         return 0;
 647 }
 648 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 649
 650 int nfs4_setup_sequence(const struct nfs_server *server,
 651                         struct nfs4_sequence_args *args,
 652                         struct nfs4_sequence_res *res,
 653                         struct rpc_task *task)
 654 {
 655         struct nfs4_session *session = nfs4_get_session(server);
 656         int ret = 0;
 657
 658         if (session == NULL)
 659                 goto out;
 660
 661         dprintk("--> %s clp %p session %p sr_slot %td\n",
 662                 __func__, session->clp, session, res->sr_slot ?
 663                         res->sr_slot - session->fc_slot_table.slots : -1);
 664
 665         ret = nfs41_setup_sequence(session, args, res, task);
 666 out:
 667         dprintk("<-- %s status=%d\n", __func__, ret);
 668         return ret;
 669 }
 670
 671 struct nfs41_call_sync_data {
 672         const struct nfs_server *seq_server;
 673         struct nfs4_sequence_args *seq_args;
 674         struct nfs4_sequence_res *seq_res;
 675 };
 676
 677 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 678 {
 679         struct nfs41_call_sync_data *data = calldata;
 680
 681         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 682
 683         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 684                                 data->seq_res, task))
 685                 return;
 686         rpc_call_start(task);
 687 }
 688
 689 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 690 {
 691         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 692         nfs41_call_sync_prepare(task, calldata);
 693 }
 694
 695 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 696 {
 697         struct nfs41_call_sync_data *data = calldata;
 698
 699         nfs41_sequence_done(task, data->seq_res);
 700 }
 701
 702 static const struct rpc_call_ops nfs41_call_sync_ops = {
 703         .rpc_call_prepare = nfs41_call_sync_prepare,
 704         .rpc_call_done = nfs41_call_sync_done,
 705 };
 706
 707 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 708         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 709         .rpc_call_done = nfs41_call_sync_done,
 710 };
 711
 712 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 713                                    struct nfs_server *server,
 714                                    struct rpc_message *msg,
 715                                    struct nfs4_sequence_args *args,
 716                                    struct nfs4_sequence_res *res,
 717                                    int privileged)
 718 {
 719         int ret;
 720         struct rpc_task *task;
 721         struct nfs41_call_sync_data data = {
 722                 .seq_server = server,
 723                 .seq_args = args,
 724                 .seq_res = res,
 725         };
 726         struct rpc_task_setup task_setup = {
 727                 .rpc_client = clnt,
 728                 .rpc_message = msg,
 729                 .callback_ops = &nfs41_call_sync_ops,
 730                 .callback_data = &data
 731         };
 732
 733         if (privileged)
 734                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 735         task = rpc_run_task(&task_setup);
 736         if (IS_ERR(task))
 737                 ret = PTR_ERR(task);
 738         else {
 739                 ret = task->tk_status;
 740                 rpc_put_task(task);
 741         }
 742         return ret;
 743 }
 744
 745 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 746                             struct nfs_server *server,
 747                             struct rpc_message *msg,
 748                             struct nfs4_sequence_args *args,
 749                             struct nfs4_sequence_res *res,
 750                             int cache_reply)
 751 {
 752         nfs41_init_sequence(args, res, cache_reply);
 753         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 754 }
 755
 756 #else
 757 static inline
 758 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 759                 struct nfs4_sequence_res *res, int cache_reply)
 760 {
 761 }
 762
 763 static int nfs4_sequence_done(struct rpc_task *task,
 764                                struct nfs4_sequence_res *res)
 765 {
 766         return 1;
 767 }
 768 #endif /* CONFIG_NFS_V4_1 */
 769
 770 int _nfs4_call_sync(struct rpc_clnt *clnt,
 771                     struct nfs_server *server,
 772                     struct rpc_message *msg,
 773                     struct nfs4_sequence_args *args,
 774                     struct nfs4_sequence_res *res,
 775                     int cache_reply)
 776 {
 777         nfs41_init_sequence(args, res, cache_reply);
 778         return rpc_call_sync(clnt, msg, 0);
 779 }
 780
 781 static inline
 782 int nfs4_call_sync(struct rpc_clnt *clnt,
 783                    struct nfs_server *server,
 784                    struct rpc_message *msg,
 785                    struct nfs4_sequence_args *args,
 786                    struct nfs4_sequence_res *res,
 787                    int cache_reply)
 788 {
 789         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 790                                                 args, res, cache_reply);
 791 }
 792
 793 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 794 {
 795         struct nfs_inode *nfsi = NFS_I(dir);
 796
 797         spin_lock(&dir->i_lock);
 798         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 799         if (!cinfo->atomic || cinfo->before != dir->i_version)
 800                 nfs_force_lookup_revalidate(dir);
 801         dir->i_version = cinfo->after;
 802         spin_unlock(&dir->i_lock);
 803 }
 804
 805 struct nfs4_opendata {
 806         struct kref kref;
 807         struct nfs_openargs o_arg;
 808         struct nfs_openres o_res;
 809         struct nfs_open_confirmargs c_arg;
 810         struct nfs_open_confirmres c_res;
 811         struct nfs4_string owner_name;
 812         struct nfs4_string group_name;
 813         struct nfs_fattr f_attr;
 814         struct dentry *dir;
 815         struct dentry *dentry;
 816         struct nfs4_state_owner *owner;
 817         struct nfs4_state *state;
 818         struct iattr attrs;
 819         unsigned long timestamp;
 820         unsigned int rpc_done : 1;
 821         int rpc_status;
 822         int cancelled;
 823 };
 824
 825
 826 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 827 {
 828         p->o_res.f_attr = &p->f_attr;
 829         p->o_res.seqid = p->o_arg.seqid;
 830         p->c_res.seqid = p->c_arg.seqid;
 831         p->o_res.server = p->o_arg.server;
 832         nfs_fattr_init(&p->f_attr);
 833         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 834 }
 835
 836 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 837                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 838                 const struct iattr *attrs,
 839                 gfp_t gfp_mask)
 840 {
 841         struct dentry *parent = dget_parent(dentry);
 842         struct inode *dir = parent->d_inode;
 843         struct nfs_server *server = NFS_SERVER(dir);
 844         struct nfs4_opendata *p;
 845
 846         p = kzalloc(sizeof(*p), gfp_mask);
 847         if (p == NULL)
 848                 goto err;
 849         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 850         if (p->o_arg.seqid == NULL)
 851                 goto err_free;
 852         nfs_sb_active(dentry->d_sb);
 853         p->dentry = dget(dentry);
 854         p->dir = parent;
 855         p->owner = sp;
 856         atomic_inc(&sp->so_count);
 857         p->o_arg.fh = NFS_FH(dir);
 858         p->o_arg.open_flags = flags;
 859         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 860         p->o_arg.clientid = server->nfs_client->cl_clientid;
 861         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 862         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 863         p->o_arg.name = &dentry->d_name;
 864         p->o_arg.server = server;
 865         p->o_arg.bitmask = server->attr_bitmask;
 866         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 867         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 868         if (attrs != NULL && attrs->ia_valid != 0) {
 869                 __be32 verf[2];
 870
 871                 p->o_arg.u.attrs = &p->attrs;
 872                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 873
 874                 verf[0] = jiffies;
 875                 verf[1] = current->pid;
 876                 memcpy(p->o_arg.u.verifier.data, verf,
 877                                 sizeof(p->o_arg.u.verifier.data));
 878         }
 879         p->c_arg.fh = &p->o_res.fh;
 880         p->c_arg.stateid = &p->o_res.stateid;
 881         p->c_arg.seqid = p->o_arg.seqid;
 882         nfs4_init_opendata_res(p);
 883         kref_init(&p->kref);
 884         return p;
 885 err_free:
 886         kfree(p);
 887 err:
 888         dput(parent);
 889         return NULL;
 890 }
 891
 892 static void nfs4_opendata_free(struct kref *kref)
 893 {
 894         struct nfs4_opendata *p = container_of(kref,
 895                         struct nfs4_opendata, kref);
 896         struct super_block *sb = p->dentry->d_sb;
 897
 898         nfs_free_seqid(p->o_arg.seqid);
 899         if (p->state != NULL)
 900                 nfs4_put_open_state(p->state);
 901         nfs4_put_state_owner(p->owner);
 902         dput(p->dir);
 903         dput(p->dentry);
 904         nfs_sb_deactive(sb);
 905         nfs_fattr_free_names(&p->f_attr);
 906         kfree(p);
 907 }
 908
 909 static void nfs4_opendata_put(struct nfs4_opendata *p)
 910 {
 911         if (p != NULL)
 912                 kref_put(&p->kref, nfs4_opendata_free);
 913 }
 914
 915 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 916 {
 917         int ret;
 918
 919         ret = rpc_wait_for_completion_task(task);
 920         return ret;
 921 }
 922
 923 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 924 {
 925         int ret = 0;
 926
 927         if (open_mode & (O_EXCL|O_TRUNC))
 928                 goto out;
 929         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 930                 case FMODE_READ:
 931                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 932                                 && state->n_rdonly != 0;
 933                         break;
 934                 case FMODE_WRITE:
 935                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 936                                 && state->n_wronly != 0;
 937                         break;
 938                 case FMODE_READ|FMODE_WRITE:
 939                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 940                                 && state->n_rdwr != 0;
 941         }
 942 out:
 943         return ret;
 944 }
 945
 946 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 947 {
 948         if (delegation == NULL)
 949                 return 0;
 950         if ((delegation->type & fmode) != fmode)
 951                 return 0;
 952         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 953                 return 0;
 954         nfs_mark_delegation_referenced(delegation);
 955         return 1;
 956 }
 957
 958 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 959 {
 960         switch (fmode) {
 961                 case FMODE_WRITE:
 962                         state->n_wronly++;
 963                         break;
 964                 case FMODE_READ:
 965                         state->n_rdonly++;
 966                         break;
 967                 case FMODE_READ|FMODE_WRITE:
 968                         state->n_rdwr++;
 969         }
 970         nfs4_state_set_mode_locked(state, state->state | fmode);
 971 }
 972
 973 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 974 {
 975         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 976                 nfs4_stateid_copy(&state->stateid, stateid);
 977         nfs4_stateid_copy(&state->open_stateid, stateid);
 978         switch (fmode) {
 979                 case FMODE_READ:
 980                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 981                         break;
 982                 case FMODE_WRITE:
 983                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 984                         break;
 985                 case FMODE_READ|FMODE_WRITE:
 986                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 987         }
 988 }
 989
 990 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 991 {
 992         write_seqlock(&state->seqlock);
 993         nfs_set_open_stateid_locked(state, stateid, fmode);
 994         write_sequnlock(&state->seqlock);
 995 }
 996
 997 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 998 {
 999         /*
1000          * Protect the call to nfs4_state_set_mode_locked and
1001          * serialise the stateid update
1002          */
1003         write_seqlock(&state->seqlock);
1004         if (deleg_stateid != NULL) {
1005                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1006                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1007         }
1008         if (open_stateid != NULL)
1009                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1010         write_sequnlock(&state->seqlock);
1011         spin_lock(&state->owner->so_lock);
1012         update_open_stateflags(state, fmode);
1013         spin_unlock(&state->owner->so_lock);
1014 }
1015
1016 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1017 {
1018         struct nfs_inode *nfsi = NFS_I(state->inode);
1019         struct nfs_delegation *deleg_cur;
1020         int ret = 0;
1021
1022         fmode &= (FMODE_READ|FMODE_WRITE);
1023
1024         rcu_read_lock();
1025         deleg_cur = rcu_dereference(nfsi->delegation);
1026         if (deleg_cur == NULL)
1027                 goto no_delegation;
1028
1029         spin_lock(&deleg_cur->lock);
1030         if (nfsi->delegation != deleg_cur ||
1031             (deleg_cur->type & fmode) != fmode)
1032                 goto no_delegation_unlock;
1033
1034         if (delegation == NULL)
1035                 delegation = &deleg_cur->stateid;
1036         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1037                 goto no_delegation_unlock;
1038
1039         nfs_mark_delegation_referenced(deleg_cur);
1040         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1041         ret = 1;
1042 no_delegation_unlock:
1043         spin_unlock(&deleg_cur->lock);
1044 no_delegation:
1045         rcu_read_unlock();
1046
1047         if (!ret && open_stateid != NULL) {
1048                 __update_open_stateid(state, open_stateid, NULL, fmode);
1049                 ret = 1;
1050         }
1051
1052         return ret;
1053 }
1054
1055
1056 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1057 {
1058         struct nfs_delegation *delegation;
1059
1060         rcu_read_lock();
1061         delegation = rcu_dereference(NFS_I(inode)->delegation);
1062         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1063                 rcu_read_unlock();
1064                 return;
1065         }
1066         rcu_read_unlock();
1067         nfs4_inode_return_delegation(inode);
1068 }
1069
1070 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1071 {
1072         struct nfs4_state *state = opendata->state;
1073         struct nfs_inode *nfsi = NFS_I(state->inode);
1074         struct nfs_delegation *delegation;
1075         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1076         fmode_t fmode = opendata->o_arg.fmode;
1077         nfs4_stateid stateid;
1078         int ret = -EAGAIN;
1079
1080         for (;;) {
1081                 if (can_open_cached(state, fmode, open_mode)) {
1082                         spin_lock(&state->owner->so_lock);
1083                         if (can_open_cached(state, fmode, open_mode)) {
1084                                 update_open_stateflags(state, fmode);
1085                                 spin_unlock(&state->owner->so_lock);
1086                                 goto out_return_state;
1087                         }
1088                         spin_unlock(&state->owner->so_lock);
1089                 }
1090                 rcu_read_lock();
1091                 delegation = rcu_dereference(nfsi->delegation);
1092                 if (!can_open_delegated(delegation, fmode)) {
1093                         rcu_read_unlock();
1094                         break;
1095                 }
1096                 /* Save the delegation */
1097                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1098                 rcu_read_unlock();
1099                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1100                 if (ret != 0)
1101                         goto out;
1102                 ret = -EAGAIN;
1103
1104                 /* Try to update the stateid using the delegation */
1105                 if (update_open_stateid(state, NULL, &stateid, fmode))
1106                         goto out_return_state;
1107         }
1108 out:
1109         return ERR_PTR(ret);
1110 out_return_state:
1111         atomic_inc(&state->count);
1112         return state;
1113 }
1114
1115 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1116 {
1117         struct inode *inode;
1118         struct nfs4_state *state = NULL;
1119         struct nfs_delegation *delegation;
1120         int ret;
1121
1122         if (!data->rpc_done) {
1123                 state = nfs4_try_open_cached(data);
1124                 goto out;
1125         }
1126
1127         ret = -EAGAIN;
1128         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1129                 goto err;
1130         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1131         ret = PTR_ERR(inode);
1132         if (IS_ERR(inode))
1133                 goto err;
1134         ret = -ENOMEM;
1135         state = nfs4_get_open_state(inode, data->owner);
1136         if (state == NULL)
1137                 goto err_put_inode;
1138         if (data->o_res.delegation_type != 0) {
1139                 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1140                 int delegation_flags = 0;
1141
1142                 rcu_read_lock();
1143                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1144                 if (delegation)
1145                         delegation_flags = delegation->flags;
1146                 rcu_read_unlock();
1147                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1148                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1149                                         "returning a delegation for "
1150                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1151                                         clp->cl_hostname);
1152                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1153                         nfs_inode_set_delegation(state->inode,
1154                                         data->owner->so_cred,
1155                                         &data->o_res);
1156                 else
1157                         nfs_inode_reclaim_delegation(state->inode,
1158                                         data->owner->so_cred,
1159                                         &data->o_res);
1160         }
1161
1162         update_open_stateid(state, &data->o_res.stateid, NULL,
1163                         data->o_arg.fmode);
1164         iput(inode);
1165 out:
1166         return state;
1167 err_put_inode:
1168         iput(inode);
1169 err:
1170         return ERR_PTR(ret);
1171 }
1172
1173 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1174 {
1175         struct nfs_inode *nfsi = NFS_I(state->inode);
1176         struct nfs_open_context *ctx;
1177
1178         spin_lock(&state->inode->i_lock);
1179         list_for_each_entry(ctx, &nfsi->open_files, list) {
1180                 if (ctx->state != state)
1181                         continue;
1182                 get_nfs_open_context(ctx);
1183                 spin_unlock(&state->inode->i_lock);
1184                 return ctx;
1185         }
1186         spin_unlock(&state->inode->i_lock);
1187         return ERR_PTR(-ENOENT);
1188 }
1189
1190 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1191 {
1192         struct nfs4_opendata *opendata;
1193
1194         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1195         if (opendata == NULL)
1196                 return ERR_PTR(-ENOMEM);
1197         opendata->state = state;
1198         atomic_inc(&state->count);
1199         return opendata;
1200 }
1201
1202 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1203 {
1204         struct nfs4_state *newstate;
1205         int ret;
1206
1207         opendata->o_arg.open_flags = 0;
1208         opendata->o_arg.fmode = fmode;
1209         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1210         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1211         nfs4_init_opendata_res(opendata);
1212         ret = _nfs4_recover_proc_open(opendata);
1213         if (ret != 0)
1214                 return ret;
1215         newstate = nfs4_opendata_to_nfs4_state(opendata);
1216         if (IS_ERR(newstate))
1217                 return PTR_ERR(newstate);
1218         nfs4_close_state(newstate, fmode);
1219         *res = newstate;
1220         return 0;
1221 }
1222
1223 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1224 {
1225         struct nfs4_state *newstate;
1226         int ret;
1227
1228         /* memory barrier prior to reading state->n_* */
1229         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1230         smp_rmb();
1231         if (state->n_rdwr != 0) {
1232                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1233                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1234                 if (ret != 0)
1235                         return ret;
1236                 if (newstate != state)
1237                         return -ESTALE;
1238         }
1239         if (state->n_wronly != 0) {
1240                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1241                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1242                 if (ret != 0)
1243                         return ret;
1244                 if (newstate != state)
1245                         return -ESTALE;
1246         }
1247         if (state->n_rdonly != 0) {
1248                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1249                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1250                 if (ret != 0)
1251                         return ret;
1252                 if (newstate != state)
1253                         return -ESTALE;
1254         }
1255         /*
1256          * We may have performed cached opens for all three recoveries.
1257          * Check if we need to update the current stateid.
1258          */
1259         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1260             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1261                 write_seqlock(&state->seqlock);
1262                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1263                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1264                 write_sequnlock(&state->seqlock);
1265         }
1266         return 0;
1267 }
1268
1269 /*
1270  * OPEN_RECLAIM:
1271  *      reclaim state on the server after a reboot.
1272  */
1273 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1274 {
1275         struct nfs_delegation *delegation;
1276         struct nfs4_opendata *opendata;
1277         fmode_t delegation_type = 0;
1278         int status;
1279
1280         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1281         if (IS_ERR(opendata))
1282                 return PTR_ERR(opendata);
1283         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1284         opendata->o_arg.fh = NFS_FH(state->inode);
1285         rcu_read_lock();
1286         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1287         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1288                 delegation_type = delegation->type;
1289         rcu_read_unlock();
1290         opendata->o_arg.u.delegation_type = delegation_type;
1291         status = nfs4_open_recover(opendata, state);
1292         nfs4_opendata_put(opendata);
1293         return status;
1294 }
1295
1296 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1297 {
1298         struct nfs_server *server = NFS_SERVER(state->inode);
1299         struct nfs4_exception exception = { };
1300         int err;
1301         do {
1302                 err = _nfs4_do_open_reclaim(ctx, state);
1303                 if (err != -NFS4ERR_DELAY)
1304                         break;
1305                 nfs4_handle_exception(server, err, &exception);
1306         } while (exception.retry);
1307         return err;
1308 }
1309
1310 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1311 {
1312         struct nfs_open_context *ctx;
1313         int ret;
1314
1315         ctx = nfs4_state_find_open_context(state);
1316         if (IS_ERR(ctx))
1317                 return PTR_ERR(ctx);
1318         ret = nfs4_do_open_reclaim(ctx, state);
1319         put_nfs_open_context(ctx);
1320         return ret;
1321 }
1322
1323 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1324 {
1325         struct nfs4_opendata *opendata;
1326         int ret;
1327
1328         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1329         if (IS_ERR(opendata))
1330                 return PTR_ERR(opendata);
1331         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1332         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1333         ret = nfs4_open_recover(opendata, state);
1334         nfs4_opendata_put(opendata);
1335         return ret;
1336 }
1337
1338 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1339 {
1340         struct nfs4_exception exception = { };
1341         struct nfs_server *server = NFS_SERVER(state->inode);
1342         int err;
1343         do {
1344                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1345                 switch (err) {
1346                         case 0:
1347                         case -ENOENT:
1348                         case -ESTALE:
1349                                 goto out;
1350                         case -NFS4ERR_BADSESSION:
1351                         case -NFS4ERR_BADSLOT:
1352                         case -NFS4ERR_BAD_HIGH_SLOT:
1353                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1354                         case -NFS4ERR_DEADSESSION:
1355                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1356                                 goto out;
1357                         case -NFS4ERR_STALE_CLIENTID:
1358                         case -NFS4ERR_STALE_STATEID:
1359                         case -NFS4ERR_EXPIRED:
1360                                 /* Don't recall a delegation if it was lost */
1361                                 nfs4_schedule_lease_recovery(server->nfs_client);
1362                                 goto out;
1363                         case -ERESTARTSYS:
1364                                 /*
1365                                  * The show must go on: exit, but mark the
1366                                  * stateid as needing recovery.
1367                                  */
1368                         case -NFS4ERR_DELEG_REVOKED:
1369                         case -NFS4ERR_ADMIN_REVOKED:
1370                         case -NFS4ERR_BAD_STATEID:
1371                                 nfs_inode_find_state_and_recover(state->inode,
1372                                                 stateid);
1373                                 nfs4_schedule_stateid_recovery(server, state);
1374                         case -EKEYEXPIRED:
1375                                 /*
1376                                  * User RPCSEC_GSS context has expired.
1377                                  * We cannot recover this stateid now, so
1378                                  * skip it and allow recovery thread to
1379                                  * proceed.
1380                                  */
1381                         case -ENOMEM:
1382                                 err = 0;
1383                                 goto out;
1384                 }
1385                 err = nfs4_handle_exception(server, err, &exception);
1386         } while (exception.retry);
1387 out:
1388         return err;
1389 }
1390
1391 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1392 {
1393         struct nfs4_opendata *data = calldata;
1394
1395         data->rpc_status = task->tk_status;
1396         if (data->rpc_status == 0) {
1397                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1398                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1399                 renew_lease(data->o_res.server, data->timestamp);
1400                 data->rpc_done = 1;
1401         }
1402 }
1403
1404 static void nfs4_open_confirm_release(void *calldata)
1405 {
1406         struct nfs4_opendata *data = calldata;
1407         struct nfs4_state *state = NULL;
1408
1409         /* If this request hasn't been cancelled, do nothing */
1410         if (data->cancelled == 0)
1411                 goto out_free;
1412         /* In case of error, no cleanup! */
1413         if (!data->rpc_done)
1414                 goto out_free;
1415         state = nfs4_opendata_to_nfs4_state(data);
1416         if (!IS_ERR(state))
1417                 nfs4_close_state(state, data->o_arg.fmode);
1418 out_free:
1419         nfs4_opendata_put(data);
1420 }
1421
1422 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1423         .rpc_call_done = nfs4_open_confirm_done,
1424         .rpc_release = nfs4_open_confirm_release,
1425 };
1426
1427 /*
1428  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1429  */
1430 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1431 {
1432         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1433         struct rpc_task *task;
1434         struct  rpc_message msg = {
1435                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1436                 .rpc_argp = &data->c_arg,
1437                 .rpc_resp = &data->c_res,
1438                 .rpc_cred = data->owner->so_cred,
1439         };
1440         struct rpc_task_setup task_setup_data = {
1441                 .rpc_client = server->client,
1442                 .rpc_message = &msg,
1443                 .callback_ops = &nfs4_open_confirm_ops,
1444                 .callback_data = data,
1445                 .workqueue = nfsiod_workqueue,
1446                 .flags = RPC_TASK_ASYNC,
1447         };
1448         int status;
1449
1450         kref_get(&data->kref);
1451         data->rpc_done = 0;
1452         data->rpc_status = 0;
1453         data->timestamp = jiffies;
1454         task = rpc_run_task(&task_setup_data);
1455         if (IS_ERR(task))
1456                 return PTR_ERR(task);
1457         status = nfs4_wait_for_completion_rpc_task(task);
1458         if (status != 0) {
1459                 data->cancelled = 1;
1460                 smp_wmb();
1461         } else
1462                 status = data->rpc_status;
1463         rpc_put_task(task);
1464         return status;
1465 }
1466
1467 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1468 {
1469         struct nfs4_opendata *data = calldata;
1470         struct nfs4_state_owner *sp = data->owner;
1471
1472         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1473                 return;
1474         /*
1475          * Check if we still need to send an OPEN call, or if we can use
1476          * a delegation instead.
1477          */
1478         if (data->state != NULL) {
1479                 struct nfs_delegation *delegation;
1480
1481                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1482                         goto out_no_action;
1483                 rcu_read_lock();
1484                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1485                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1486                     can_open_delegated(delegation, data->o_arg.fmode))
1487                         goto unlock_no_action;
1488                 rcu_read_unlock();
1489         }
1490         /* Update client id. */
1491         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1492         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1493                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1494                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1495         }
1496         data->timestamp = jiffies;
1497         if (nfs4_setup_sequence(data->o_arg.server,
1498                                 &data->o_arg.seq_args,
1499                                 &data->o_res.seq_res, task))
1500                 return;
1501         rpc_call_start(task);
1502         return;
1503 unlock_no_action:
1504         rcu_read_unlock();
1505 out_no_action:
1506         task->tk_action = NULL;
1507
1508 }
1509
1510 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1511 {
1512         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1513         nfs4_open_prepare(task, calldata);
1514 }
1515
1516 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1517 {
1518         struct nfs4_opendata *data = calldata;
1519
1520         data->rpc_status = task->tk_status;
1521
1522         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1523                 return;
1524
1525         if (task->tk_status == 0) {
1526                 switch (data->o_res.f_attr->mode & S_IFMT) {
1527                         case S_IFREG:
1528                                 break;
1529                         case S_IFLNK:
1530                                 data->rpc_status = -ELOOP;
1531                                 break;
1532                         case S_IFDIR:
1533                                 data->rpc_status = -EISDIR;
1534                                 break;
1535                         default:
1536                                 data->rpc_status = -ENOTDIR;
1537                 }
1538                 renew_lease(data->o_res.server, data->timestamp);
1539                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1540                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1541         }
1542         data->rpc_done = 1;
1543 }
1544
1545 static void nfs4_open_release(void *calldata)
1546 {
1547         struct nfs4_opendata *data = calldata;
1548         struct nfs4_state *state = NULL;
1549
1550         /* If this request hasn't been cancelled, do nothing */
1551         if (data->cancelled == 0)
1552                 goto out_free;
1553         /* In case of error, no cleanup! */
1554         if (data->rpc_status != 0 || !data->rpc_done)
1555                 goto out_free;
1556         /* In case we need an open_confirm, no cleanup! */
1557         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1558                 goto out_free;
1559         state = nfs4_opendata_to_nfs4_state(data);
1560         if (!IS_ERR(state))
1561                 nfs4_close_state(state, data->o_arg.fmode);
1562 out_free:
1563         nfs4_opendata_put(data);
1564 }
1565
1566 static const struct rpc_call_ops nfs4_open_ops = {
1567         .rpc_call_prepare = nfs4_open_prepare,
1568         .rpc_call_done = nfs4_open_done,
1569         .rpc_release = nfs4_open_release,
1570 };
1571
1572 static const struct rpc_call_ops nfs4_recover_open_ops = {
1573         .rpc_call_prepare = nfs4_recover_open_prepare,
1574         .rpc_call_done = nfs4_open_done,
1575         .rpc_release = nfs4_open_release,
1576 };
1577
1578 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1579 {
1580         struct inode *dir = data->dir->d_inode;
1581         struct nfs_server *server = NFS_SERVER(dir);
1582         struct nfs_openargs *o_arg = &data->o_arg;
1583         struct nfs_openres *o_res = &data->o_res;
1584         struct rpc_task *task;
1585         struct rpc_message msg = {
1586                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1587                 .rpc_argp = o_arg,
1588                 .rpc_resp = o_res,
1589                 .rpc_cred = data->owner->so_cred,
1590         };
1591         struct rpc_task_setup task_setup_data = {
1592                 .rpc_client = server->client,
1593                 .rpc_message = &msg,
1594                 .callback_ops = &nfs4_open_ops,
1595                 .callback_data = data,
1596                 .workqueue = nfsiod_workqueue,
1597                 .flags = RPC_TASK_ASYNC,
1598         };
1599         int status;
1600
1601         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1602         kref_get(&data->kref);
1603         data->rpc_done = 0;
1604         data->rpc_status = 0;
1605         data->cancelled = 0;
1606         if (isrecover)
1607                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1608         task = rpc_run_task(&task_setup_data);
1609         if (IS_ERR(task))
1610                 return PTR_ERR(task);
1611         status = nfs4_wait_for_completion_rpc_task(task);
1612         if (status != 0) {
1613                 data->cancelled = 1;
1614                 smp_wmb();
1615         } else
1616                 status = data->rpc_status;
1617         rpc_put_task(task);
1618
1619         return status;
1620 }
1621
1622 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1623 {
1624         struct inode *dir = data->dir->d_inode;
1625         struct nfs_openres *o_res = &data->o_res;
1626         int status;
1627
1628         status = nfs4_run_open_task(data, 1);
1629         if (status != 0 || !data->rpc_done)
1630                 return status;
1631
1632         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1633
1634         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1635                 status = _nfs4_proc_open_confirm(data);
1636                 if (status != 0)
1637                         return status;
1638         }
1639
1640         return status;
1641 }
1642
1643 /*
1644  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1645  */
1646 static int _nfs4_proc_open(struct nfs4_opendata *data)
1647 {
1648         struct inode *dir = data->dir->d_inode;
1649         struct nfs_server *server = NFS_SERVER(dir);
1650         struct nfs_openargs *o_arg = &data->o_arg;
1651         struct nfs_openres *o_res = &data->o_res;
1652         int status;
1653
1654         status = nfs4_run_open_task(data, 0);
1655         if (!data->rpc_done)
1656                 return status;
1657         if (status != 0) {
1658                 if (status == -NFS4ERR_BADNAME &&
1659                                 !(o_arg->open_flags & O_CREAT))
1660                         return -ENOENT;
1661                 return status;
1662         }
1663
1664         nfs_fattr_map_and_free_names(server, &data->f_attr);
1665
1666         if (o_arg->open_flags & O_CREAT)
1667                 update_changeattr(dir, &o_res->cinfo);
1668         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1669                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1670         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1671                 status = _nfs4_proc_open_confirm(data);
1672                 if (status != 0)
1673                         return status;
1674         }
1675         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1676                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1677         return 0;
1678 }
1679
1680 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1681 {
1682         unsigned int loop;
1683         int ret;
1684
1685         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1686                 ret = nfs4_wait_clnt_recover(clp);
1687                 if (ret != 0)
1688                         break;
1689                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1690                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1691                         break;
1692                 nfs4_schedule_state_manager(clp);
1693                 ret = -EIO;
1694         }
1695         return ret;
1696 }
1697
1698 static int nfs4_recover_expired_lease(struct nfs_server *server)
1699 {
1700         return nfs4_client_recover_expired_lease(server->nfs_client);
1701 }
1702
1703 /*
1704  * OPEN_EXPIRED:
1705  *      reclaim state on the server after a network partition.
1706  *      Assumes caller holds the appropriate lock
1707  */
1708 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1709 {
1710         struct nfs4_opendata *opendata;
1711         int ret;
1712
1713         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1714         if (IS_ERR(opendata))
1715                 return PTR_ERR(opendata);
1716         ret = nfs4_open_recover(opendata, state);
1717         if (ret == -ESTALE)
1718                 d_drop(ctx->dentry);
1719         nfs4_opendata_put(opendata);
1720         return ret;
1721 }
1722
1723 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1724 {
1725         struct nfs_server *server = NFS_SERVER(state->inode);
1726         struct nfs4_exception exception = { };
1727         int err;
1728
1729         do {
1730                 err = _nfs4_open_expired(ctx, state);
1731                 switch (err) {
1732                 default:
1733                         goto out;
1734                 case -NFS4ERR_GRACE:
1735                 case -NFS4ERR_DELAY:
1736                         nfs4_handle_exception(server, err, &exception);
1737                         err = 0;
1738                 }
1739         } while (exception.retry);
1740 out:
1741         return err;
1742 }
1743
1744 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1745 {
1746         struct nfs_open_context *ctx;
1747         int ret;
1748
1749         ctx = nfs4_state_find_open_context(state);
1750         if (IS_ERR(ctx))
1751                 return PTR_ERR(ctx);
1752         ret = nfs4_do_open_expired(ctx, state);
1753         put_nfs_open_context(ctx);
1754         return ret;
1755 }
1756
1757 #if defined(CONFIG_NFS_V4_1)
1758 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1759 {
1760         struct nfs_server *server = NFS_SERVER(state->inode);
1761         nfs4_stateid *stateid = &state->stateid;
1762         int status;
1763
1764         /* If a state reset has been done, test_stateid is unneeded */
1765         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1766                 return;
1767
1768         status = nfs41_test_stateid(server, stateid);
1769         if (status != NFS_OK) {
1770                 /* Free the stateid unless the server explicitly
1771                  * informs us the stateid is unrecognized. */
1772                 if (status != -NFS4ERR_BAD_STATEID)
1773                         nfs41_free_stateid(server, stateid);
1774
1775                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1776         }
1777 }
1778
1779 /**
1780  * nfs41_check_open_stateid - possibly free an open stateid
1781  *
1782  * @state: NFSv4 state for an inode
1783  *
1784  * Returns NFS_OK if recovery for this stateid is now finished.
1785  * Otherwise a negative NFS4ERR value is returned.
1786  */
1787 static int nfs41_check_open_stateid(struct nfs4_state *state)
1788 {
1789         struct nfs_server *server = NFS_SERVER(state->inode);
1790         nfs4_stateid *stateid = &state->stateid;
1791         int status;
1792
1793         /* If a state reset has been done, test_stateid is unneeded */
1794         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1795             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1796             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1797                 return -NFS4ERR_BAD_STATEID;
1798
1799         status = nfs41_test_stateid(server, stateid);
1800         if (status != NFS_OK) {
1801                 /* Free the stateid unless the server explicitly
1802                  * informs us the stateid is unrecognized. */
1803                 if (status != -NFS4ERR_BAD_STATEID)
1804                         nfs41_free_stateid(server, stateid);
1805
1806                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1807                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1808                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1809         }
1810         return status;
1811 }
1812
1813 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1814 {
1815         int status;
1816
1817         nfs41_clear_delegation_stateid(state);
1818         status = nfs41_check_open_stateid(state);
1819         if (status != NFS_OK)
1820                 status = nfs4_open_expired(sp, state);
1821         return status;
1822 }
1823 #endif
1824
1825 /*
1826  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1827  * fields corresponding to attributes that were used to store the verifier.
1828  * Make sure we clobber those fields in the later setattr call
1829  */
1830 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1831 {
1832         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1833             !(sattr->ia_valid & ATTR_ATIME_SET))
1834                 sattr->ia_valid |= ATTR_ATIME;
1835
1836         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1837             !(sattr->ia_valid & ATTR_MTIME_SET))
1838                 sattr->ia_valid |= ATTR_MTIME;
1839 }
1840
1841 /*
1842  * Returns a referenced nfs4_state
1843  */
1844 static int _nfs4_do_open(struct inode *dir,
1845                         struct dentry *dentry,
1846                         fmode_t fmode,
1847                         int flags,
1848                         struct iattr *sattr,
1849                         struct rpc_cred *cred,
1850                         struct nfs4_state **res,
1851                         struct nfs4_threshold **ctx_th)
1852 {
1853         struct nfs4_state_owner  *sp;
1854         struct nfs4_state     *state = NULL;
1855         struct nfs_server       *server = NFS_SERVER(dir);
1856         struct nfs4_opendata *opendata;
1857         int status;
1858
1859         /* Protect against reboot recovery conflicts */
1860         status = -ENOMEM;
1861         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1862         if (sp == NULL) {
1863                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1864                 goto out_err;
1865         }
1866         status = nfs4_recover_expired_lease(server);
1867         if (status != 0)
1868                 goto err_put_state_owner;
1869         if (dentry->d_inode != NULL)
1870                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1871         status = -ENOMEM;
1872         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1873         if (opendata == NULL)
1874                 goto err_put_state_owner;
1875
1876         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1877                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1878                 if (!opendata->f_attr.mdsthreshold)
1879                         goto err_opendata_put;
1880                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1881         }
1882         if (dentry->d_inode != NULL)
1883                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1884
1885         status = _nfs4_proc_open(opendata);
1886         if (status != 0)
1887                 goto err_opendata_put;
1888
1889         state = nfs4_opendata_to_nfs4_state(opendata);
1890         status = PTR_ERR(state);
1891         if (IS_ERR(state))
1892                 goto err_opendata_put;
1893         if (server->caps & NFS_CAP_POSIX_LOCK)
1894                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1895
1896         if (opendata->o_arg.open_flags & O_EXCL) {
1897                 nfs4_exclusive_attrset(opendata, sattr);
1898
1899                 nfs_fattr_init(opendata->o_res.f_attr);
1900                 status = nfs4_do_setattr(state->inode, cred,
1901                                 opendata->o_res.f_attr, sattr,
1902                                 state);
1903                 if (status == 0)
1904                         nfs_setattr_update_inode(state->inode, sattr);
1905                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1906         }
1907
1908         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1909                 *ctx_th = opendata->f_attr.mdsthreshold;
1910         else
1911                 kfree(opendata->f_attr.mdsthreshold);
1912         opendata->f_attr.mdsthreshold = NULL;
1913
1914         nfs4_opendata_put(opendata);
1915         nfs4_put_state_owner(sp);
1916         *res = state;
1917         return 0;
1918 err_opendata_put:
1919         kfree(opendata->f_attr.mdsthreshold);
1920         nfs4_opendata_put(opendata);
1921 err_put_state_owner:
1922         nfs4_put_state_owner(sp);
1923 out_err:
1924         *res = NULL;
1925         return status;
1926 }
1927
1928
1929 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1930                                         struct dentry *dentry,
1931                                         fmode_t fmode,
1932                                         int flags,
1933                                         struct iattr *sattr,
1934                                         struct rpc_cred *cred,
1935                                         struct nfs4_threshold **ctx_th)
1936 {
1937         struct nfs4_exception exception = { };
1938         struct nfs4_state *res;
1939         int status;
1940
1941         fmode &= FMODE_READ|FMODE_WRITE;
1942         do {
1943                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1944                                        &res, ctx_th);
1945                 if (status == 0)
1946                         break;
1947                 /* NOTE: BAD_SEQID means the server and client disagree about the
1948                  * book-keeping w.r.t. state-changing operations
1949                  * (OPEN/CLOSE/LOCK/LOCKU...)
1950                  * It is actually a sign of a bug on the client or on the server.
1951                  *
1952                  * If we receive a BAD_SEQID error in the particular case of
1953                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1954                  * have unhashed the old state_owner for us, and that we can
1955                  * therefore safely retry using a new one. We should still warn
1956                  * the user though...
1957                  */
1958                 if (status == -NFS4ERR_BAD_SEQID) {
1959                         pr_warn_ratelimited("NFS: v4 server %s "
1960                                         " returned a bad sequence-id error!\n",
1961                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1962                         exception.retry = 1;
1963                         continue;
1964                 }
1965                 /*
1966                  * BAD_STATEID on OPEN means that the server cancelled our
1967                  * state before it received the OPEN_CONFIRM.
1968                  * Recover by retrying the request as per the discussion
1969                  * on Page 181 of RFC3530.
1970                  */
1971                 if (status == -NFS4ERR_BAD_STATEID) {
1972                         exception.retry = 1;
1973                         continue;
1974                 }
1975                 if (status == -EAGAIN) {
1976                         /* We must have found a delegation */
1977                         exception.retry = 1;
1978                         continue;
1979                 }
1980                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1981                                         status, &exception));
1982         } while (exception.retry);
1983         return res;
1984 }
1985
1986 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1987                             struct nfs_fattr *fattr, struct iattr *sattr,
1988                             struct nfs4_state *state)
1989 {
1990         struct nfs_server *server = NFS_SERVER(inode);
1991         struct nfs_setattrargs  arg = {
1992                 .fh             = NFS_FH(inode),
1993                 .iap            = sattr,
1994                 .server         = server,
1995                 .bitmask = server->attr_bitmask,
1996         };
1997         struct nfs_setattrres  res = {
1998                 .fattr          = fattr,
1999                 .server         = server,
2000         };
2001         struct rpc_message msg = {
2002                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2003                 .rpc_argp       = &arg,
2004                 .rpc_resp       = &res,
2005                 .rpc_cred       = cred,
2006         };
2007         unsigned long timestamp = jiffies;
2008         int status;
2009
2010         nfs_fattr_init(fattr);
2011
2012         if (state != NULL) {
2013                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2014                                 current->files, current->tgid);
2015         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2016                                 FMODE_WRITE)) {
2017                 /* Use that stateid */
2018         } else
2019                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2020
2021         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2022         if (status == 0 && state != NULL)
2023                 renew_lease(server, timestamp);
2024         return status;
2025 }
2026
2027 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2028                            struct nfs_fattr *fattr, struct iattr *sattr,
2029                            struct nfs4_state *state)
2030 {
2031         struct nfs_server *server = NFS_SERVER(inode);
2032         struct nfs4_exception exception = {
2033                 .state = state,
2034                 .inode = inode,
2035         };
2036         int err;
2037         do {
2038                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2039                 switch (err) {
2040                 case -NFS4ERR_OPENMODE:
2041                         if (state && !(state->state & FMODE_WRITE)) {
2042                                 err = -EBADF;
2043                                 if (sattr->ia_valid & ATTR_OPEN)
2044                                         err = -EACCES;
2045                                 goto out;
2046                         }
2047                 }
2048                 err = nfs4_handle_exception(server, err, &exception);
2049         } while (exception.retry);
2050 out:
2051         return err;
2052 }
2053
2054 struct nfs4_closedata {
2055         struct inode *inode;
2056         struct nfs4_state *state;
2057         struct nfs_closeargs arg;
2058         struct nfs_closeres res;
2059         struct nfs_fattr fattr;
2060         unsigned long timestamp;
2061         bool roc;
2062         u32 roc_barrier;
2063 };
2064
2065 static void nfs4_free_closedata(void *data)
2066 {
2067         struct nfs4_closedata *calldata = data;
2068         struct nfs4_state_owner *sp = calldata->state->owner;
2069         struct super_block *sb = calldata->state->inode->i_sb;
2070
2071         if (calldata->roc)
2072                 pnfs_roc_release(calldata->state->inode);
2073         nfs4_put_open_state(calldata->state);
2074         nfs_free_seqid(calldata->arg.seqid);
2075         nfs4_put_state_owner(sp);
2076         nfs_sb_deactive(sb);
2077         kfree(calldata);
2078 }
2079
2080 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2081                 fmode_t fmode)
2082 {
2083         spin_lock(&state->owner->so_lock);
2084         if (!(fmode & FMODE_READ))
2085                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2086         if (!(fmode & FMODE_WRITE))
2087                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2088         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2089         spin_unlock(&state->owner->so_lock);
2090 }
2091
2092 static void nfs4_close_done(struct rpc_task *task, void *data)
2093 {
2094         struct nfs4_closedata *calldata = data;
2095         struct nfs4_state *state = calldata->state;
2096         struct nfs_server *server = NFS_SERVER(calldata->inode);
2097
2098         dprintk("%s: begin!\n", __func__);
2099         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2100                 return;
2101         /* hmm. we are done with the inode, and in the process of freeing
2102          * the state_owner. we keep this around to process errors
2103          */
2104         switch (task->tk_status) {
2105                 case 0:
2106                         if (calldata->roc)
2107                                 pnfs_roc_set_barrier(state->inode,
2108                                                      calldata->roc_barrier);
2109                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2110                         renew_lease(server, calldata->timestamp);
2111                         nfs4_close_clear_stateid_flags(state,
2112                                         calldata->arg.fmode);
2113                         break;
2114                 case -NFS4ERR_STALE_STATEID:
2115                 case -NFS4ERR_OLD_STATEID:
2116                 case -NFS4ERR_BAD_STATEID:
2117                 case -NFS4ERR_EXPIRED:
2118                         if (calldata->arg.fmode == 0)
2119                                 break;
2120                 default:
2121                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2122                                 rpc_restart_call_prepare(task);
2123         }
2124         nfs_release_seqid(calldata->arg.seqid);
2125         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2126         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2127 }
2128
2129 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2130 {
2131         struct nfs4_closedata *calldata = data;
2132         struct nfs4_state *state = calldata->state;
2133         int call_close = 0;
2134
2135         dprintk("%s: begin!\n", __func__);
2136         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2137                 return;
2138
2139         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2140         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2141         spin_lock(&state->owner->so_lock);
2142         /* Calculate the change in open mode */
2143         if (state->n_rdwr == 0) {
2144                 if (state->n_rdonly == 0) {
2145                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2146                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2147                         calldata->arg.fmode &= ~FMODE_READ;
2148                 }
2149                 if (state->n_wronly == 0) {
2150                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2151                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2152                         calldata->arg.fmode &= ~FMODE_WRITE;
2153                 }
2154         }
2155         spin_unlock(&state->owner->so_lock);
2156
2157         if (!call_close) {
2158                 /* Note: exit _without_ calling nfs4_close_done */
2159                 task->tk_action = NULL;
2160                 goto out;
2161         }
2162
2163         if (calldata->arg.fmode == 0) {
2164                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2165                 if (calldata->roc &&
2166                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2167                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2168                                      task, NULL);
2169                         goto out;
2170                 }
2171         }
2172
2173         nfs_fattr_init(calldata->res.fattr);
2174         calldata->timestamp = jiffies;
2175         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2176                                 &calldata->arg.seq_args,
2177                                 &calldata->res.seq_res,
2178                                 task))
2179                 goto out;
2180         rpc_call_start(task);
2181 out:
2182         dprintk("%s: done!\n", __func__);
2183 }
2184
2185 static const struct rpc_call_ops nfs4_close_ops = {
2186         .rpc_call_prepare = nfs4_close_prepare,
2187         .rpc_call_done = nfs4_close_done,
2188         .rpc_release = nfs4_free_closedata,
2189 };
2190
2191 /*
2192  * It is possible for data to be read/written from a mem-mapped file
2193  * after the sys_close call (which hits the vfs layer as a flush).
2194  * This means that we can't safely call nfsv4 close on a file until
2195  * the inode is cleared. This in turn means that we are not good
2196  * NFSv4 citizens - we do not indicate to the server to update the file's
2197  * share state even when we are done with one of the three share
2198  * stateid's in the inode.
2199  *
2200  * NOTE: Caller must be holding the sp->so_owner semaphore!
2201  */
2202 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2203 {
2204         struct nfs_server *server = NFS_SERVER(state->inode);
2205         struct nfs4_closedata *calldata;
2206         struct nfs4_state_owner *sp = state->owner;
2207         struct rpc_task *task;
2208         struct rpc_message msg = {
2209                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2210                 .rpc_cred = state->owner->so_cred,
2211         };
2212         struct rpc_task_setup task_setup_data = {
2213                 .rpc_client = server->client,
2214                 .rpc_message = &msg,
2215                 .callback_ops = &nfs4_close_ops,
2216                 .workqueue = nfsiod_workqueue,
2217                 .flags = RPC_TASK_ASYNC,
2218         };
2219         int status = -ENOMEM;
2220
2221         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2222         if (calldata == NULL)
2223                 goto out;
2224         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2225         calldata->inode = state->inode;
2226         calldata->state = state;
2227         calldata->arg.fh = NFS_FH(state->inode);
2228         calldata->arg.stateid = &state->open_stateid;
2229         /* Serialization for the sequence id */
2230         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2231         if (calldata->arg.seqid == NULL)
2232                 goto out_free_calldata;
2233         calldata->arg.fmode = 0;
2234         calldata->arg.bitmask = server->cache_consistency_bitmask;
2235         calldata->res.fattr = &calldata->fattr;
2236         calldata->res.seqid = calldata->arg.seqid;
2237         calldata->res.server = server;
2238         calldata->roc = roc;
2239         nfs_sb_active(calldata->inode->i_sb);
2240
2241         msg.rpc_argp = &calldata->arg;
2242         msg.rpc_resp = &calldata->res;
2243         task_setup_data.callback_data = calldata;
2244         task = rpc_run_task(&task_setup_data);
2245         if (IS_ERR(task))
2246                 return PTR_ERR(task);
2247         status = 0;
2248         if (wait)
2249                 status = rpc_wait_for_completion_task(task);
2250         rpc_put_task(task);
2251         return status;
2252 out_free_calldata:
2253         kfree(calldata);
2254 out:
2255         if (roc)
2256                 pnfs_roc_release(state->inode);
2257         nfs4_put_open_state(state);
2258         nfs4_put_state_owner(sp);
2259         return status;
2260 }
2261
2262 static struct inode *
2263 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2264 {
2265         struct nfs4_state *state;
2266
2267         /* Protect against concurrent sillydeletes */
2268         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2269                              ctx->cred, &ctx->mdsthreshold);
2270         if (IS_ERR(state))
2271                 return ERR_CAST(state);
2272         ctx->state = state;
2273         return igrab(state->inode);
2274 }
2275
2276 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2277 {
2278         if (ctx->state == NULL)
2279                 return;
2280         if (is_sync)
2281                 nfs4_close_sync(ctx->state, ctx->mode);
2282         else
2283                 nfs4_close_state(ctx->state, ctx->mode);
2284 }
2285
2286 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2287 {
2288         struct nfs4_server_caps_arg args = {
2289                 .fhandle = fhandle,
2290         };
2291         struct nfs4_server_caps_res res = {};
2292         struct rpc_message msg = {
2293                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2294                 .rpc_argp = &args,
2295                 .rpc_resp = &res,
2296         };
2297         int status;
2298
2299         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2300         if (status == 0) {
2301                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2302                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2303                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2304                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2305                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2306                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2307                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2308                         server->caps |= NFS_CAP_ACLS;
2309                 if (res.has_links != 0)
2310                         server->caps |= NFS_CAP_HARDLINKS;
2311                 if (res.has_symlinks != 0)
2312                         server->caps |= NFS_CAP_SYMLINKS;
2313                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2314                         server->caps |= NFS_CAP_FILEID;
2315                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2316                         server->caps |= NFS_CAP_MODE;
2317                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2318                         server->caps |= NFS_CAP_NLINK;
2319                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2320                         server->caps |= NFS_CAP_OWNER;
2321                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2322                         server->caps |= NFS_CAP_OWNER_GROUP;
2323                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2324                         server->caps |= NFS_CAP_ATIME;
2325                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2326                         server->caps |= NFS_CAP_CTIME;
2327                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2328                         server->caps |= NFS_CAP_MTIME;
2329
2330                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2331                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2332                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2333                 server->acl_bitmask = res.acl_bitmask;
2334                 server->fh_expire_type = res.fh_expire_type;
2335         }
2336
2337         return status;
2338 }
2339
2340 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2341 {
2342         struct nfs4_exception exception = { };
2343         int err;
2344         do {
2345                 err = nfs4_handle_exception(server,
2346                                 _nfs4_server_capabilities(server, fhandle),
2347                                 &exception);
2348         } while (exception.retry);
2349         return err;
2350 }
2351
2352 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2353                 struct nfs_fsinfo *info)
2354 {
2355         struct nfs4_lookup_root_arg args = {
2356                 .bitmask = nfs4_fattr_bitmap,
2357         };
2358         struct nfs4_lookup_res res = {
2359                 .server = server,
2360                 .fattr = info->fattr,
2361                 .fh = fhandle,
2362         };
2363         struct rpc_message msg = {
2364                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2365                 .rpc_argp = &args,
2366                 .rpc_resp = &res,
2367         };
2368
2369         nfs_fattr_init(info->fattr);
2370         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2371 }
2372
2373 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2374                 struct nfs_fsinfo *info)
2375 {
2376         struct nfs4_exception exception = { };
2377         int err;
2378         do {
2379                 err = _nfs4_lookup_root(server, fhandle, info);
2380                 switch (err) {
2381                 case 0:
2382                 case -NFS4ERR_WRONGSEC:
2383                         goto out;
2384                 default:
2385                         err = nfs4_handle_exception(server, err, &exception);
2386                 }
2387         } while (exception.retry);
2388 out:
2389         return err;
2390 }
2391
2392 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2393                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2394 {
2395         struct rpc_auth *auth;
2396         int ret;
2397
2398         auth = rpcauth_create(flavor, server->client);
2399         if (!auth) {
2400                 ret = -EIO;
2401                 goto out;
2402         }
2403         ret = nfs4_lookup_root(server, fhandle, info);
2404 out:
2405         return ret;
2406 }
2407
2408 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2409                               struct nfs_fsinfo *info)
2410 {
2411         int i, len, status = 0;
2412         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2413
2414         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2415         BUG_ON(len < 0);
2416
2417         for (i = 0; i < len; i++) {
2418                 /* AUTH_UNIX is the default flavor if none was specified,
2419                  * thus has already been tried. */
2420                 if (flav_array[i] == RPC_AUTH_UNIX)
2421                         continue;
2422
2423                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2424                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2425                         continue;
2426                 break;
2427         }
2428         /*
2429          * -EACCESS could mean that the user doesn't have correct permissions
2430          * to access the mount.  It could also mean that we tried to mount
2431          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2432          * existing mount programs don't handle -EACCES very well so it should
2433          * be mapped to -EPERM instead.
2434          */
2435         if (status == -EACCES)
2436                 status = -EPERM;
2437         return status;
2438 }
2439
2440 /*
2441  * get the file handle for the "/" directory on the server
2442  */
2443 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2444                          struct nfs_fsinfo *info)
2445 {
2446         int minor_version = server->nfs_client->cl_minorversion;
2447         int status = nfs4_lookup_root(server, fhandle, info);
2448         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2449                 /*
2450                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2451                  * by nfs4_map_errors() as this function exits.
2452                  */
2453                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2454         if (status == 0)
2455                 status = nfs4_server_capabilities(server, fhandle);
2456         if (status == 0)
2457                 status = nfs4_do_fsinfo(server, fhandle, info);
2458         return nfs4_map_errors(status);
2459 }
2460
2461 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2462                               struct nfs_fsinfo *info)
2463 {
2464         int error;
2465         struct nfs_fattr *fattr = info->fattr;
2466
2467         error = nfs4_server_capabilities(server, mntfh);
2468         if (error < 0) {
2469                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2470                 return error;
2471         }
2472
2473         error = nfs4_proc_getattr(server, mntfh, fattr);
2474         if (error < 0) {
2475                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2476                 return error;
2477         }
2478
2479         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2480             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2481                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2482
2483         return error;
2484 }
2485
2486 /*
2487  * Get locations and (maybe) other attributes of a referral.
2488  * Note that we'll actually follow the referral later when
2489  * we detect fsid mismatch in inode revalidation
2490  */
2491 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2492                              const struct qstr *name, struct nfs_fattr *fattr,
2493                              struct nfs_fh *fhandle)
2494 {
2495         int status = -ENOMEM;
2496         struct page *page = NULL;
2497         struct nfs4_fs_locations *locations = NULL;
2498
2499         page = alloc_page(GFP_KERNEL);
2500         if (page == NULL)
2501                 goto out;
2502         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2503         if (locations == NULL)
2504                 goto out;
2505
2506         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2507         if (status != 0)
2508                 goto out;
2509         /* Make sure server returned a different fsid for the referral */
2510         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2511                 dprintk("%s: server did not return a different fsid for"
2512                         " a referral at %s\n", __func__, name->name);
2513                 status = -EIO;
2514                 goto out;
2515         }
2516         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2517         nfs_fixup_referral_attributes(&locations->fattr);
2518
2519         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2520         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2521         memset(fhandle, 0, sizeof(struct nfs_fh));
2522 out:
2523         if (page)
2524                 __free_page(page);
2525         kfree(locations);
2526         return status;
2527 }
2528
2529 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2530 {
2531         struct nfs4_getattr_arg args = {
2532                 .fh = fhandle,
2533                 .bitmask = server->attr_bitmask,
2534         };
2535         struct nfs4_getattr_res res = {
2536                 .fattr = fattr,
2537                 .server = server,
2538         };
2539         struct rpc_message msg = {
2540                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2541                 .rpc_argp = &args,
2542                 .rpc_resp = &res,
2543         };
2544
2545         nfs_fattr_init(fattr);
2546         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2547 }
2548
2549 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2550 {
2551         struct nfs4_exception exception = { };
2552         int err;
2553         do {
2554                 err = nfs4_handle_exception(server,
2555                                 _nfs4_proc_getattr(server, fhandle, fattr),
2556                                 &exception);
2557         } while (exception.retry);
2558         return err;
2559 }
2560
2561 /*
2562  * The file is not closed if it is opened due to the a request to change
2563  * the size of the file. The open call will not be needed once the
2564  * VFS layer lookup-intents are implemented.
2565  *
2566  * Close is called when the inode is destroyed.
2567  * If we haven't opened the file for O_WRONLY, we
2568  * need to in the size_change case to obtain a stateid.
2569  *
2570  * Got race?
2571  * Because OPEN is always done by name in nfsv4, it is
2572  * possible that we opened a different file by the same
2573  * name.  We can recognize this race condition, but we
2574  * can't do anything about it besides returning an error.
2575  *
2576  * This will be fixed with VFS changes (lookup-intent).
2577  */
2578 static int
2579 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2580                   struct iattr *sattr)
2581 {
2582         struct inode *inode = dentry->d_inode;
2583         struct rpc_cred *cred = NULL;
2584         struct nfs4_state *state = NULL;
2585         int status;
2586
2587         if (pnfs_ld_layoutret_on_setattr(inode))
2588                 pnfs_return_layout(inode);
2589
2590         nfs_fattr_init(fattr);
2591
2592         /* Deal with open(O_TRUNC) */
2593         if (sattr->ia_valid & ATTR_OPEN)
2594                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2595
2596         /* Optimization: if the end result is no change, don't RPC */
2597         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2598                 return 0;
2599
2600         /* Search for an existing open(O_WRITE) file */
2601         if (sattr->ia_valid & ATTR_FILE) {
2602                 struct nfs_open_context *ctx;
2603
2604                 ctx = nfs_file_open_context(sattr->ia_file);
2605                 if (ctx) {
2606                         cred = ctx->cred;
2607                         state = ctx->state;
2608                 }
2609         }
2610
2611         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2612         if (status == 0)
2613                 nfs_setattr_update_inode(inode, sattr);
2614         return status;
2615 }
2616
2617 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2618                 const struct qstr *name, struct nfs_fh *fhandle,
2619                 struct nfs_fattr *fattr)
2620 {
2621         struct nfs_server *server = NFS_SERVER(dir);
2622         int                    status;
2623         struct nfs4_lookup_arg args = {
2624                 .bitmask = server->attr_bitmask,
2625                 .dir_fh = NFS_FH(dir),
2626                 .name = name,
2627         };
2628         struct nfs4_lookup_res res = {
2629                 .server = server,
2630                 .fattr = fattr,
2631                 .fh = fhandle,
2632         };
2633         struct rpc_message msg = {
2634                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2635                 .rpc_argp = &args,
2636                 .rpc_resp = &res,
2637         };
2638
2639         nfs_fattr_init(fattr);
2640
2641         dprintk("NFS call  lookup %s\n", name->name);
2642         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2643         dprintk("NFS reply lookup: %d\n", status);
2644         return status;
2645 }
2646
2647 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2648 {
2649         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2650                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2651         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2652         fattr->nlink = 2;
2653 }
2654
2655 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2656                                    struct qstr *name, struct nfs_fh *fhandle,
2657                                    struct nfs_fattr *fattr)
2658 {
2659         struct nfs4_exception exception = { };
2660         struct rpc_clnt *client = *clnt;
2661         int err;
2662         do {
2663                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2664                 switch (err) {
2665                 case -NFS4ERR_BADNAME:
2666                         err = -ENOENT;
2667                         goto out;
2668                 case -NFS4ERR_MOVED:
2669                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2670                         goto out;
2671                 case -NFS4ERR_WRONGSEC:
2672                         err = -EPERM;
2673                         if (client != *clnt)
2674                                 goto out;
2675
2676                         client = nfs4_create_sec_client(client, dir, name);
2677                         if (IS_ERR(client))
2678                                 return PTR_ERR(client);
2679
2680                         exception.retry = 1;
2681                         break;
2682                 default:
2683                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2684                 }
2685         } while (exception.retry);
2686
2687 out:
2688         if (err == 0)
2689                 *clnt = client;
2690         else if (client != *clnt)
2691                 rpc_shutdown_client(client);
2692
2693         return err;
2694 }
2695
2696 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2697                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2698 {
2699         int status;
2700         struct rpc_clnt *client = NFS_CLIENT(dir);
2701
2702         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2703         if (client != NFS_CLIENT(dir)) {
2704                 rpc_shutdown_client(client);
2705                 nfs_fixup_secinfo_attributes(fattr);
2706         }
2707         return status;
2708 }
2709
2710 struct rpc_clnt *
2711 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2712                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2713 {
2714         int status;
2715         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2716
2717         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2718         if (status < 0) {
2719                 rpc_shutdown_client(client);
2720                 return ERR_PTR(status);
2721         }
2722         return client;
2723 }
2724
2725 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2726 {
2727         struct nfs_server *server = NFS_SERVER(inode);
2728         struct nfs4_accessargs args = {
2729                 .fh = NFS_FH(inode),
2730                 .bitmask = server->cache_consistency_bitmask,
2731         };
2732         struct nfs4_accessres res = {
2733                 .server = server,
2734         };
2735         struct rpc_message msg = {
2736                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2737                 .rpc_argp = &args,
2738                 .rpc_resp = &res,
2739                 .rpc_cred = entry->cred,
2740         };
2741         int mode = entry->mask;
2742         int status;
2743
2744         /*
2745          * Determine which access bits we want to ask for...
2746          */
2747         if (mode & MAY_READ)
2748                 args.access |= NFS4_ACCESS_READ;
2749         if (S_ISDIR(inode->i_mode)) {
2750                 if (mode & MAY_WRITE)
2751                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2752                 if (mode & MAY_EXEC)
2753                         args.access |= NFS4_ACCESS_LOOKUP;
2754         } else {
2755                 if (mode & MAY_WRITE)
2756                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2757                 if (mode & MAY_EXEC)
2758                         args.access |= NFS4_ACCESS_EXECUTE;
2759         }
2760
2761         res.fattr = nfs_alloc_fattr();
2762         if (res.fattr == NULL)
2763                 return -ENOMEM;
2764
2765         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2766         if (!status) {
2767                 entry->mask = 0;
2768                 if (res.access & NFS4_ACCESS_READ)
2769                         entry->mask |= MAY_READ;
2770                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2771                         entry->mask |= MAY_WRITE;
2772                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2773                         entry->mask |= MAY_EXEC;
2774                 nfs_refresh_inode(inode, res.fattr);
2775         }
2776         nfs_free_fattr(res.fattr);
2777         return status;
2778 }
2779
2780 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2781 {
2782         struct nfs4_exception exception = { };
2783         int err;
2784         do {
2785                 err = nfs4_handle_exception(NFS_SERVER(inode),
2786                                 _nfs4_proc_access(inode, entry),
2787                                 &exception);
2788         } while (exception.retry);
2789         return err;
2790 }
2791
2792 /*
2793  * TODO: For the time being, we don't try to get any attributes
2794  * along with any of the zero-copy operations READ, READDIR,
2795  * READLINK, WRITE.
2796  *
2797  * In the case of the first three, we want to put the GETATTR
2798  * after the read-type operation -- this is because it is hard
2799  * to predict the length of a GETATTR response in v4, and thus
2800  * align the READ data correctly.  This means that the GETATTR
2801  * may end up partially falling into the page cache, and we should
2802  * shift it into the 'tail' of the xdr_buf before processing.
2803  * To do this efficiently, we need to know the total length
2804  * of data received, which doesn't seem to be available outside
2805  * of the RPC layer.
2806  *
2807  * In the case of WRITE, we also want to put the GETATTR after
2808  * the operation -- in this case because we want to make sure
2809  * we get the post-operation mtime and size.
2810  *
2811  * Both of these changes to the XDR layer would in fact be quite
2812  * minor, but I decided to leave them for a subsequent patch.
2813  */
2814 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2815                 unsigned int pgbase, unsigned int pglen)
2816 {
2817         struct nfs4_readlink args = {
2818                 .fh       = NFS_FH(inode),
2819                 .pgbase   = pgbase,
2820                 .pglen    = pglen,
2821                 .pages    = &page,
2822         };
2823         struct nfs4_readlink_res res;
2824         struct rpc_message msg = {
2825                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2826                 .rpc_argp = &args,
2827                 .rpc_resp = &res,
2828         };
2829
2830         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2831 }
2832
2833 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2834                 unsigned int pgbase, unsigned int pglen)
2835 {
2836         struct nfs4_exception exception = { };
2837         int err;
2838         do {
2839                 err = nfs4_handle_exception(NFS_SERVER(inode),
2840                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2841                                 &exception);
2842         } while (exception.retry);
2843         return err;
2844 }
2845
2846 /*
2847  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2848  */
2849 static int
2850 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2851                  int flags)
2852 {
2853         struct nfs_open_context *ctx;
2854         struct nfs4_state *state;
2855         int status = 0;
2856
2857         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2858         if (IS_ERR(ctx))
2859                 return PTR_ERR(ctx);
2860
2861         sattr->ia_mode &= ~current_umask();
2862         state = nfs4_do_open(dir, dentry, ctx->mode,
2863                         flags, sattr, ctx->cred,
2864                         &ctx->mdsthreshold);
2865         d_drop(dentry);
2866         if (IS_ERR(state)) {
2867                 status = PTR_ERR(state);
2868                 goto out;
2869         }
2870         d_add(dentry, igrab(state->inode));
2871         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2872         ctx->state = state;
2873 out:
2874         put_nfs_open_context(ctx);
2875         return status;
2876 }
2877
2878 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2879 {
2880         struct nfs_server *server = NFS_SERVER(dir);
2881         struct nfs_removeargs args = {
2882                 .fh = NFS_FH(dir),
2883                 .name = *name,
2884         };
2885         struct nfs_removeres res = {
2886                 .server = server,
2887         };
2888         struct rpc_message msg = {
2889                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2890                 .rpc_argp = &args,
2891                 .rpc_resp = &res,
2892         };
2893         int status;
2894
2895         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2896         if (status == 0)
2897                 update_changeattr(dir, &res.cinfo);
2898         return status;
2899 }
2900
2901 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2902 {
2903         struct nfs4_exception exception = { };
2904         int err;
2905         do {
2906                 err = nfs4_handle_exception(NFS_SERVER(dir),
2907                                 _nfs4_proc_remove(dir, name),
2908                                 &exception);
2909         } while (exception.retry);
2910         return err;
2911 }
2912
2913 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2914 {
2915         struct nfs_server *server = NFS_SERVER(dir);
2916         struct nfs_removeargs *args = msg->rpc_argp;
2917         struct nfs_removeres *res = msg->rpc_resp;
2918
2919         res->server = server;
2920         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2921         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2922 }
2923
2924 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2925 {
2926         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2927                                 &data->args.seq_args,
2928                                 &data->res.seq_res,
2929                                 task))
2930                 return;
2931         rpc_call_start(task);
2932 }
2933
2934 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2935 {
2936         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2937
2938         if (!nfs4_sequence_done(task, &res->seq_res))
2939                 return 0;
2940         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2941                 return 0;
2942         update_changeattr(dir, &res->cinfo);
2943         return 1;
2944 }
2945
2946 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2947 {
2948         struct nfs_server *server = NFS_SERVER(dir);
2949         struct nfs_renameargs *arg = msg->rpc_argp;
2950         struct nfs_renameres *res = msg->rpc_resp;
2951
2952         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2953         res->server = server;
2954         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2955 }
2956
2957 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2958 {
2959         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2960                                 &data->args.seq_args,
2961                                 &data->res.seq_res,
2962                                 task))
2963                 return;
2964         rpc_call_start(task);
2965 }
2966
2967 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2968                                  struct inode *new_dir)
2969 {
2970         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2971
2972         if (!nfs4_sequence_done(task, &res->seq_res))
2973                 return 0;
2974         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2975                 return 0;
2976
2977         update_changeattr(old_dir, &res->old_cinfo);
2978         update_changeattr(new_dir, &res->new_cinfo);
2979         return 1;
2980 }
2981
2982 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2983                 struct inode *new_dir, struct qstr *new_name)
2984 {
2985         struct nfs_server *server = NFS_SERVER(old_dir);
2986         struct nfs_renameargs arg = {
2987                 .old_dir = NFS_FH(old_dir),
2988                 .new_dir = NFS_FH(new_dir),
2989                 .old_name = old_name,
2990                 .new_name = new_name,
2991         };
2992         struct nfs_renameres res = {
2993                 .server = server,
2994         };
2995         struct rpc_message msg = {
2996                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2997                 .rpc_argp = &arg,
2998                 .rpc_resp = &res,
2999         };
3000         int status = -ENOMEM;
3001
3002         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3003         if (!status) {
3004                 update_changeattr(old_dir, &res.old_cinfo);
3005                 update_changeattr(new_dir, &res.new_cinfo);
3006         }
3007         return status;
3008 }
3009
3010 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3011                 struct inode *new_dir, struct qstr *new_name)
3012 {
3013         struct nfs4_exception exception = { };
3014         int err;
3015         do {
3016                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3017                                 _nfs4_proc_rename(old_dir, old_name,
3018                                         new_dir, new_name),
3019                                 &exception);
3020         } while (exception.retry);
3021         return err;
3022 }
3023
3024 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3025 {
3026         struct nfs_server *server = NFS_SERVER(inode);
3027         struct nfs4_link_arg arg = {
3028                 .fh     = NFS_FH(inode),
3029                 .dir_fh = NFS_FH(dir),
3030                 .name   = name,
3031                 .bitmask = server->attr_bitmask,
3032         };
3033         struct nfs4_link_res res = {
3034                 .server = server,
3035         };
3036         struct rpc_message msg = {
3037                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3038                 .rpc_argp = &arg,
3039                 .rpc_resp = &res,
3040         };
3041         int status = -ENOMEM;
3042
3043         res.fattr = nfs_alloc_fattr();
3044         if (res.fattr == NULL)
3045                 goto out;
3046
3047         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3048         if (!status) {
3049                 update_changeattr(dir, &res.cinfo);
3050                 nfs_post_op_update_inode(inode, res.fattr);
3051         }
3052 out:
3053         nfs_free_fattr(res.fattr);
3054         return status;
3055 }
3056
3057 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3058 {
3059         struct nfs4_exception exception = { };
3060         int err;
3061         do {
3062                 err = nfs4_handle_exception(NFS_SERVER(inode),
3063                                 _nfs4_proc_link(inode, dir, name),
3064                                 &exception);
3065         } while (exception.retry);
3066         return err;
3067 }
3068
3069 struct nfs4_createdata {
3070         struct rpc_message msg;
3071         struct nfs4_create_arg arg;
3072         struct nfs4_create_res res;
3073         struct nfs_fh fh;
3074         struct nfs_fattr fattr;
3075 };
3076
3077 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3078                 struct qstr *name, struct iattr *sattr, u32 ftype)
3079 {
3080         struct nfs4_createdata *data;
3081
3082         data = kzalloc(sizeof(*data), GFP_KERNEL);
3083         if (data != NULL) {
3084                 struct nfs_server *server = NFS_SERVER(dir);
3085
3086                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3087                 data->msg.rpc_argp = &data->arg;
3088                 data->msg.rpc_resp = &data->res;
3089                 data->arg.dir_fh = NFS_FH(dir);
3090                 data->arg.server = server;
3091                 data->arg.name = name;
3092                 data->arg.attrs = sattr;
3093                 data->arg.ftype = ftype;
3094                 data->arg.bitmask = server->attr_bitmask;
3095                 data->res.server = server;
3096                 data->res.fh = &data->fh;
3097                 data->res.fattr = &data->fattr;
3098                 nfs_fattr_init(data->res.fattr);
3099         }
3100         return data;
3101 }
3102
3103 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3104 {
3105         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3106                                     &data->arg.seq_args, &data->res.seq_res, 1);
3107         if (status == 0) {
3108                 update_changeattr(dir, &data->res.dir_cinfo);
3109                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3110         }
3111         return status;
3112 }
3113
3114 static void nfs4_free_createdata(struct nfs4_createdata *data)
3115 {
3116         kfree(data);
3117 }
3118
3119 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3120                 struct page *page, unsigned int len, struct iattr *sattr)
3121 {
3122         struct nfs4_createdata *data;
3123         int status = -ENAMETOOLONG;
3124
3125         if (len > NFS4_MAXPATHLEN)
3126                 goto out;
3127
3128         status = -ENOMEM;
3129         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3130         if (data == NULL)
3131                 goto out;
3132
3133         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3134         data->arg.u.symlink.pages = &page;
3135         data->arg.u.symlink.len = len;
3136
3137         status = nfs4_do_create(dir, dentry, data);
3138
3139         nfs4_free_createdata(data);
3140 out:
3141         return status;
3142 }
3143
3144 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3145                 struct page *page, unsigned int len, struct iattr *sattr)
3146 {
3147         struct nfs4_exception exception = { };
3148         int err;
3149         do {
3150                 err = nfs4_handle_exception(NFS_SERVER(dir),
3151                                 _nfs4_proc_symlink(dir, dentry, page,
3152                                                         len, sattr),
3153                                 &exception);
3154         } while (exception.retry);
3155         return err;
3156 }
3157
3158 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3159                 struct iattr *sattr)
3160 {
3161         struct nfs4_createdata *data;
3162         int status = -ENOMEM;
3163
3164         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3165         if (data == NULL)
3166                 goto out;
3167
3168         status = nfs4_do_create(dir, dentry, data);
3169
3170         nfs4_free_createdata(data);
3171 out:
3172         return status;
3173 }
3174
3175 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3176                 struct iattr *sattr)
3177 {
3178         struct nfs4_exception exception = { };
3179         int err;
3180
3181         sattr->ia_mode &= ~current_umask();
3182         do {
3183                 err = nfs4_handle_exception(NFS_SERVER(dir),
3184                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3185                                 &exception);
3186         } while (exception.retry);
3187         return err;
3188 }
3189
3190 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3191                 u64 cookie, struct page **pages, unsigned int count, int plus)
3192 {
3193         struct inode            *dir = dentry->d_inode;
3194         struct nfs4_readdir_arg args = {
3195                 .fh = NFS_FH(dir),
3196                 .pages = pages,
3197                 .pgbase = 0,
3198                 .count = count,
3199                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3200                 .plus = plus,
3201         };
3202         struct nfs4_readdir_res res;
3203         struct rpc_message msg = {
3204                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3205                 .rpc_argp = &args,
3206                 .rpc_resp = &res,
3207                 .rpc_cred = cred,
3208         };
3209         int                     status;
3210
3211         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3212                         dentry->d_parent->d_name.name,
3213                         dentry->d_name.name,
3214                         (unsigned long long)cookie);
3215         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3216         res.pgbase = args.pgbase;
3217         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3218         if (status >= 0) {
3219                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3220                 status += args.pgbase;
3221         }
3222
3223         nfs_invalidate_atime(dir);
3224
3225         dprintk("%s: returns %d\n", __func__, status);
3226         return status;
3227 }
3228
3229 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3230                 u64 cookie, struct page **pages, unsigned int count, int plus)
3231 {
3232         struct nfs4_exception exception = { };
3233         int err;
3234         do {
3235                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3236                                 _nfs4_proc_readdir(dentry, cred, cookie,
3237                                         pages, count, plus),
3238                                 &exception);
3239         } while (exception.retry);
3240         return err;
3241 }
3242
3243 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3244                 struct iattr *sattr, dev_t rdev)
3245 {
3246         struct nfs4_createdata *data;
3247         int mode = sattr->ia_mode;
3248         int status = -ENOMEM;
3249
3250         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3251         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3252
3253         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3254         if (data == NULL)
3255                 goto out;
3256
3257         if (S_ISFIFO(mode))
3258                 data->arg.ftype = NF4FIFO;
3259         else if (S_ISBLK(mode)) {
3260                 data->arg.ftype = NF4BLK;
3261                 data->arg.u.device.specdata1 = MAJOR(rdev);
3262                 data->arg.u.device.specdata2 = MINOR(rdev);
3263         }
3264         else if (S_ISCHR(mode)) {
3265                 data->arg.ftype = NF4CHR;
3266                 data->arg.u.device.specdata1 = MAJOR(rdev);
3267                 data->arg.u.device.specdata2 = MINOR(rdev);
3268         }
3269
3270         status = nfs4_do_create(dir, dentry, data);
3271
3272         nfs4_free_createdata(data);
3273 out:
3274         return status;
3275 }
3276
3277 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3278                 struct iattr *sattr, dev_t rdev)
3279 {
3280         struct nfs4_exception exception = { };
3281         int err;
3282
3283         sattr->ia_mode &= ~current_umask();
3284         do {
3285                 err = nfs4_handle_exception(NFS_SERVER(dir),
3286                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3287                                 &exception);
3288         } while (exception.retry);
3289         return err;
3290 }
3291
3292 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3293                  struct nfs_fsstat *fsstat)
3294 {
3295         struct nfs4_statfs_arg args = {
3296                 .fh = fhandle,
3297                 .bitmask = server->attr_bitmask,
3298         };
3299         struct nfs4_statfs_res res = {
3300                 .fsstat = fsstat,
3301         };
3302         struct rpc_message msg = {
3303                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3304                 .rpc_argp = &args,
3305                 .rpc_resp = &res,
3306         };
3307
3308         nfs_fattr_init(fsstat->fattr);
3309         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3310 }
3311
3312 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3313 {
3314         struct nfs4_exception exception = { };
3315         int err;
3316         do {
3317                 err = nfs4_handle_exception(server,
3318                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3319                                 &exception);
3320         } while (exception.retry);
3321         return err;
3322 }
3323
3324 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3325                 struct nfs_fsinfo *fsinfo)
3326 {
3327         struct nfs4_fsinfo_arg args = {
3328                 .fh = fhandle,
3329                 .bitmask = server->attr_bitmask,
3330         };
3331         struct nfs4_fsinfo_res res = {
3332                 .fsinfo = fsinfo,
3333         };
3334         struct rpc_message msg = {
3335                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3336                 .rpc_argp = &args,
3337                 .rpc_resp = &res,
3338         };
3339
3340         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3341 }
3342
3343 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3344 {
3345         struct nfs4_exception exception = { };
3346         int err;
3347
3348         do {
3349                 err = nfs4_handle_exception(server,
3350                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3351                                 &exception);
3352         } while (exception.retry);
3353         return err;
3354 }
3355
3356 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3357 {
3358         int error;
3359
3360         nfs_fattr_init(fsinfo->fattr);
3361         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3362         if (error == 0)
3363                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3364
3365         return error;
3366 }
3367
3368 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3369                 struct nfs_pathconf *pathconf)
3370 {
3371         struct nfs4_pathconf_arg args = {
3372                 .fh = fhandle,
3373                 .bitmask = server->attr_bitmask,
3374         };
3375         struct nfs4_pathconf_res res = {
3376                 .pathconf = pathconf,
3377         };
3378         struct rpc_message msg = {
3379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3380                 .rpc_argp = &args,
3381                 .rpc_resp = &res,
3382         };
3383
3384         /* None of the pathconf attributes are mandatory to implement */
3385         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3386                 memset(pathconf, 0, sizeof(*pathconf));
3387                 return 0;
3388         }
3389
3390         nfs_fattr_init(pathconf->fattr);
3391         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3392 }
3393
3394 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3395                 struct nfs_pathconf *pathconf)
3396 {
3397         struct nfs4_exception exception = { };
3398         int err;
3399
3400         do {
3401                 err = nfs4_handle_exception(server,
3402                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3403                                 &exception);
3404         } while (exception.retry);
3405         return err;
3406 }
3407
3408 void __nfs4_read_done_cb(struct nfs_read_data *data)
3409 {
3410         nfs_invalidate_atime(data->header->inode);
3411 }
3412
3413 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3414 {
3415         struct nfs_server *server = NFS_SERVER(data->header->inode);
3416
3417         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3418                 rpc_restart_call_prepare(task);
3419                 return -EAGAIN;
3420         }
3421
3422         __nfs4_read_done_cb(data);
3423         if (task->tk_status > 0)
3424                 renew_lease(server, data->timestamp);
3425         return 0;
3426 }
3427
3428 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3429 {
3430
3431         dprintk("--> %s\n", __func__);
3432
3433         if (!nfs4_sequence_done(task, &data->res.seq_res))
3434                 return -EAGAIN;
3435
3436         return data->read_done_cb ? data->read_done_cb(task, data) :
3437                                     nfs4_read_done_cb(task, data);
3438 }
3439
3440 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3441 {
3442         data->timestamp   = jiffies;
3443         data->read_done_cb = nfs4_read_done_cb;
3444         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3445         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3446 }
3447
3448 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3449 {
3450         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3451                                 &data->args.seq_args,
3452                                 &data->res.seq_res,
3453                                 task))
3454                 return;
3455         rpc_call_start(task);
3456 }
3457
3458 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3459 {
3460         struct inode *inode = data->header->inode;
3461
3462         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3463                 rpc_restart_call_prepare(task);
3464                 return -EAGAIN;
3465         }
3466         if (task->tk_status >= 0) {
3467                 renew_lease(NFS_SERVER(inode), data->timestamp);
3468                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3469         }
3470         return 0;
3471 }
3472
3473 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3474 {
3475         if (!nfs4_sequence_done(task, &data->res.seq_res))
3476                 return -EAGAIN;
3477         return data->write_done_cb ? data->write_done_cb(task, data) :
3478                 nfs4_write_done_cb(task, data);
3479 }
3480
3481 static
3482 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3483 {
3484         const struct nfs_pgio_header *hdr = data->header;
3485
3486         /* Don't request attributes for pNFS or O_DIRECT writes */
3487         if (data->ds_clp != NULL || hdr->dreq != NULL)
3488                 return false;
3489         /* Otherwise, request attributes if and only if we don't hold
3490          * a delegation
3491          */
3492         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3493 }
3494
3495 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3496 {
3497         struct nfs_server *server = NFS_SERVER(data->header->inode);
3498
3499         if (!nfs4_write_need_cache_consistency_data(data)) {
3500                 data->args.bitmask = NULL;
3501                 data->res.fattr = NULL;
3502         } else
3503                 data->args.bitmask = server->cache_consistency_bitmask;
3504
3505         if (!data->write_done_cb)
3506                 data->write_done_cb = nfs4_write_done_cb;
3507         data->res.server = server;
3508         data->timestamp   = jiffies;
3509
3510         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3511         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3512 }
3513
3514 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3515 {
3516         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3517                                 &data->args.seq_args,
3518                                 &data->res.seq_res,
3519                                 task))
3520                 return;
3521         rpc_call_start(task);
3522 }
3523
3524 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3525 {
3526         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3527                                 &data->args.seq_args,
3528                                 &data->res.seq_res,
3529                                 task))
3530                 return;
3531         rpc_call_start(task);
3532 }
3533
3534 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3535 {
3536         struct inode *inode = data->inode;
3537
3538         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3539                 rpc_restart_call_prepare(task);
3540                 return -EAGAIN;
3541         }
3542         return 0;
3543 }
3544
3545 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3546 {
3547         if (!nfs4_sequence_done(task, &data->res.seq_res))
3548                 return -EAGAIN;
3549         return data->commit_done_cb(task, data);
3550 }
3551
3552 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3553 {
3554         struct nfs_server *server = NFS_SERVER(data->inode);
3555
3556         if (data->commit_done_cb == NULL)
3557                 data->commit_done_cb = nfs4_commit_done_cb;
3558         data->res.server = server;
3559         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3560         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3561 }
3562
3563 struct nfs4_renewdata {
3564         struct nfs_client       *client;
3565         unsigned long           timestamp;
3566 };
3567
3568 /*
3569  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3570  * standalone procedure for queueing an asynchronous RENEW.
3571  */
3572 static void nfs4_renew_release(void *calldata)
3573 {
3574         struct nfs4_renewdata *data = calldata;
3575         struct nfs_client *clp = data->client;
3576
3577         if (atomic_read(&clp->cl_count) > 1)
3578                 nfs4_schedule_state_renewal(clp);
3579         nfs_put_client(clp);
3580         kfree(data);
3581 }
3582
3583 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3584 {
3585         struct nfs4_renewdata *data = calldata;
3586         struct nfs_client *clp = data->client;
3587         unsigned long timestamp = data->timestamp;
3588
3589         if (task->tk_status < 0) {
3590                 /* Unless we're shutting down, schedule state recovery! */
3591                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3592                         return;
3593                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3594                         nfs4_schedule_lease_recovery(clp);
3595                         return;
3596                 }
3597                 nfs4_schedule_path_down_recovery(clp);
3598         }
3599         do_renew_lease(clp, timestamp);
3600 }
3601
3602 static const struct rpc_call_ops nfs4_renew_ops = {
3603         .rpc_call_done = nfs4_renew_done,
3604         .rpc_release = nfs4_renew_release,
3605 };
3606
3607 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3608 {
3609         struct rpc_message msg = {
3610                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3611                 .rpc_argp       = clp,
3612                 .rpc_cred       = cred,
3613         };
3614         struct nfs4_renewdata *data;
3615
3616         if (renew_flags == 0)
3617                 return 0;
3618         if (!atomic_inc_not_zero(&clp->cl_count))
3619                 return -EIO;
3620         data = kmalloc(sizeof(*data), GFP_NOFS);
3621         if (data == NULL)
3622                 return -ENOMEM;
3623         data->client = clp;
3624         data->timestamp = jiffies;
3625         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3626                         &nfs4_renew_ops, data);
3627 }
3628
3629 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3630 {
3631         struct rpc_message msg = {
3632                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3633                 .rpc_argp       = clp,
3634                 .rpc_cred       = cred,
3635         };
3636         unsigned long now = jiffies;
3637         int status;
3638
3639         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3640         if (status < 0)
3641                 return status;
3642         do_renew_lease(clp, now);
3643         return 0;
3644 }
3645
3646 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3647 {
3648         return (server->caps & NFS_CAP_ACLS)
3649                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3650                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3651 }
3652
3653 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3654  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3655  * the stack.
3656  */
3657 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3658
3659 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3660                 struct page **pages, unsigned int *pgbase)
3661 {
3662         struct page *newpage, **spages;
3663         int rc = 0;
3664         size_t len;
3665         spages = pages;
3666
3667         do {
3668                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3669                 newpage = alloc_page(GFP_KERNEL);
3670
3671                 if (newpage == NULL)
3672                         goto unwind;
3673                 memcpy(page_address(newpage), buf, len);
3674                 buf += len;
3675                 buflen -= len;
3676                 *pages++ = newpage;
3677                 rc++;
3678         } while (buflen != 0);
3679
3680         return rc;
3681
3682 unwind:
3683         for(; rc > 0; rc--)
3684                 __free_page(spages[rc-1]);
3685         return -ENOMEM;
3686 }
3687
3688 struct nfs4_cached_acl {
3689         int cached;
3690         size_t len;
3691         char data[0];
3692 };
3693
3694 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3695 {
3696         struct nfs_inode *nfsi = NFS_I(inode);
3697
3698         spin_lock(&inode->i_lock);
3699         kfree(nfsi->nfs4_acl);
3700         nfsi->nfs4_acl = acl;
3701         spin_unlock(&inode->i_lock);
3702 }
3703
3704 static void nfs4_zap_acl_attr(struct inode *inode)
3705 {
3706         nfs4_set_cached_acl(inode, NULL);
3707 }
3708
3709 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3710 {
3711         struct nfs_inode *nfsi = NFS_I(inode);
3712         struct nfs4_cached_acl *acl;
3713         int ret = -ENOENT;
3714
3715         spin_lock(&inode->i_lock);
3716         acl = nfsi->nfs4_acl;
3717         if (acl == NULL)
3718                 goto out;
3719         if (buf == NULL) /* user is just asking for length */
3720                 goto out_len;
3721         if (acl->cached == 0)
3722                 goto out;
3723         ret = -ERANGE; /* see getxattr(2) man page */
3724         if (acl->len > buflen)
3725                 goto out;
3726         memcpy(buf, acl->data, acl->len);
3727 out_len:
3728         ret = acl->len;
3729 out:
3730         spin_unlock(&inode->i_lock);
3731         return ret;
3732 }
3733
3734 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3735 {
3736         struct nfs4_cached_acl *acl;
3737
3738         if (pages && acl_len <= PAGE_SIZE) {
3739                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3740                 if (acl == NULL)
3741                         goto out;
3742                 acl->cached = 1;
3743                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3744         } else {
3745                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3746                 if (acl == NULL)
3747                         goto out;
3748                 acl->cached = 0;
3749         }
3750         acl->len = acl_len;
3751 out:
3752         nfs4_set_cached_acl(inode, acl);
3753 }
3754
3755 /*
3756  * The getxattr API returns the required buffer length when called with a
3757  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3758  * the required buf.  On a NULL buf, we send a page of data to the server
3759  * guessing that the ACL request can be serviced by a page. If so, we cache
3760  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3761  * the cache. If not so, we throw away the page, and cache the required
3762  * length. The next getxattr call will then produce another round trip to
3763  * the server, this time with the input buf of the required size.
3764  */
3765 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3766 {
3767         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3768         struct nfs_getaclargs args = {
3769                 .fh = NFS_FH(inode),
3770                 .acl_pages = pages,
3771                 .acl_len = buflen,
3772         };
3773         struct nfs_getaclres res = {
3774                 .acl_len = buflen,
3775         };
3776         struct rpc_message msg = {
3777                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3778                 .rpc_argp = &args,
3779                 .rpc_resp = &res,
3780         };
3781         int ret = -ENOMEM, npages, i;
3782         size_t acl_len = 0;
3783
3784         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3785         /* As long as we're doing a round trip to the server anyway,
3786          * let's be prepared for a page of acl data. */
3787         if (npages == 0)
3788                 npages = 1;
3789
3790         /* Add an extra page to handle the bitmap returned */
3791         npages++;
3792
3793         for (i = 0; i < npages; i++) {
3794                 pages[i] = alloc_page(GFP_KERNEL);
3795                 if (!pages[i])
3796                         goto out_free;
3797         }
3798
3799         /* for decoding across pages */
3800         res.acl_scratch = alloc_page(GFP_KERNEL);
3801         if (!res.acl_scratch)
3802                 goto out_free;
3803
3804         args.acl_len = npages * PAGE_SIZE;
3805         args.acl_pgbase = 0;
3806
3807         /* Let decode_getfacl know not to fail if the ACL data is larger than
3808          * the page we send as a guess */
3809         if (buf == NULL)
3810                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3811
3812         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3813                 __func__, buf, buflen, npages, args.acl_len);
3814         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3815                              &msg, &args.seq_args, &res.seq_res, 0);
3816         if (ret)
3817                 goto out_free;
3818
3819         acl_len = res.acl_len - res.acl_data_offset;
3820         if (acl_len > args.acl_len)
3821                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3822         else
3823                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3824                                       acl_len);
3825         if (buf) {
3826                 ret = -ERANGE;
3827                 if (acl_len > buflen)
3828                         goto out_free;
3829                 _copy_from_pages(buf, pages, res.acl_data_offset,
3830                                 acl_len);
3831         }
3832         ret = acl_len;
3833 out_free:
3834         for (i = 0; i < npages; i++)
3835                 if (pages[i])
3836                         __free_page(pages[i]);
3837         if (res.acl_scratch)
3838                 __free_page(res.acl_scratch);
3839         return ret;
3840 }
3841
3842 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3843 {
3844         struct nfs4_exception exception = { };
3845         ssize_t ret;
3846         do {
3847                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3848                 if (ret >= 0)
3849                         break;
3850                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3851         } while (exception.retry);
3852         return ret;
3853 }
3854
3855 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3856 {
3857         struct nfs_server *server = NFS_SERVER(inode);
3858         int ret;
3859
3860         if (!nfs4_server_supports_acls(server))
3861                 return -EOPNOTSUPP;
3862         ret = nfs_revalidate_inode(server, inode);
3863         if (ret < 0)
3864                 return ret;
3865         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3866                 nfs_zap_acl_cache(inode);
3867         ret = nfs4_read_cached_acl(inode, buf, buflen);
3868         if (ret != -ENOENT)
3869                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3870                  * but no cached acl data, just the acl length */
3871                 return ret;
3872         return nfs4_get_acl_uncached(inode, buf, buflen);
3873 }
3874
3875 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3876 {
3877         struct nfs_server *server = NFS_SERVER(inode);
3878         struct page *pages[NFS4ACL_MAXPAGES];
3879         struct nfs_setaclargs arg = {
3880                 .fh             = NFS_FH(inode),
3881                 .acl_pages      = pages,
3882                 .acl_len        = buflen,
3883         };
3884         struct nfs_setaclres res;
3885         struct rpc_message msg = {
3886                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3887                 .rpc_argp       = &arg,
3888                 .rpc_resp       = &res,
3889         };
3890         int ret, i;
3891
3892         if (!nfs4_server_supports_acls(server))
3893                 return -EOPNOTSUPP;
3894         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3895         if (i < 0)
3896                 return i;
3897         nfs4_inode_return_delegation(inode);
3898         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3899
3900         /*
3901          * Free each page after tx, so the only ref left is
3902          * held by the network stack
3903          */
3904         for (; i > 0; i--)
3905                 put_page(pages[i-1]);
3906
3907         /*
3908          * Acl update can result in inode attribute update.
3909          * so mark the attribute cache invalid.
3910          */
3911         spin_lock(&inode->i_lock);
3912         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3913         spin_unlock(&inode->i_lock);
3914         nfs_access_zap_cache(inode);
3915         nfs_zap_acl_cache(inode);
3916         return ret;
3917 }
3918
3919 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3920 {
3921         struct nfs4_exception exception = { };
3922         int err;
3923         do {
3924                 err = nfs4_handle_exception(NFS_SERVER(inode),
3925                                 __nfs4_proc_set_acl(inode, buf, buflen),
3926                                 &exception);
3927         } while (exception.retry);
3928         return err;
3929 }
3930
3931 static int
3932 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3933 {
3934         struct nfs_client *clp = server->nfs_client;
3935
3936         if (task->tk_status >= 0)
3937                 return 0;
3938         switch(task->tk_status) {
3939                 case -NFS4ERR_DELEG_REVOKED:
3940                 case -NFS4ERR_ADMIN_REVOKED:
3941                 case -NFS4ERR_BAD_STATEID:
3942                         if (state == NULL)
3943                                 break;
3944                         nfs_remove_bad_delegation(state->inode);
3945                 case -NFS4ERR_OPENMODE:
3946                         if (state == NULL)
3947                                 break;
3948                         nfs4_schedule_stateid_recovery(server, state);
3949                         goto wait_on_recovery;
3950                 case -NFS4ERR_EXPIRED:
3951                         if (state != NULL)
3952                                 nfs4_schedule_stateid_recovery(server, state);
3953                 case -NFS4ERR_STALE_STATEID:
3954                 case -NFS4ERR_STALE_CLIENTID:
3955                         nfs4_schedule_lease_recovery(clp);
3956                         goto wait_on_recovery;
3957 #if defined(CONFIG_NFS_V4_1)
3958                 case -NFS4ERR_BADSESSION:
3959                 case -NFS4ERR_BADSLOT:
3960                 case -NFS4ERR_BAD_HIGH_SLOT:
3961                 case -NFS4ERR_DEADSESSION:
3962                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3963                 case -NFS4ERR_SEQ_FALSE_RETRY:
3964                 case -NFS4ERR_SEQ_MISORDERED:
3965                         dprintk("%s ERROR %d, Reset session\n", __func__,
3966                                 task->tk_status);
3967                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3968                         task->tk_status = 0;
3969                         return -EAGAIN;
3970 #endif /* CONFIG_NFS_V4_1 */
3971                 case -NFS4ERR_DELAY:
3972                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3973                 case -NFS4ERR_GRACE:
3974                 case -EKEYEXPIRED:
3975                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3976                         task->tk_status = 0;
3977                         return -EAGAIN;
3978                 case -NFS4ERR_RETRY_UNCACHED_REP:
3979                 case -NFS4ERR_OLD_STATEID:
3980                         task->tk_status = 0;
3981                         return -EAGAIN;
3982         }
3983         task->tk_status = nfs4_map_errors(task->tk_status);
3984         return 0;
3985 wait_on_recovery:
3986         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3987         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3988                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3989         task->tk_status = 0;
3990         return -EAGAIN;
3991 }
3992
3993 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3994                                     nfs4_verifier *bootverf)
3995 {
3996         __be32 verf[2];
3997
3998         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3999                 /* An impossible timestamp guarantees this value
4000                  * will never match a generated boot time. */
4001                 verf[0] = 0;
4002                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4003         } else {
4004                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4005                 verf[0] = (__be32)nn->boot_time.tv_sec;
4006                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4007         }
4008         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4009 }
4010
4011 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4012                 unsigned short port, struct rpc_cred *cred,
4013                 struct nfs4_setclientid_res *res)
4014 {
4015         nfs4_verifier sc_verifier;
4016         struct nfs4_setclientid setclientid = {
4017                 .sc_verifier = &sc_verifier,
4018                 .sc_prog = program,
4019                 .sc_cb_ident = clp->cl_cb_ident,
4020         };
4021         struct rpc_message msg = {
4022                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4023                 .rpc_argp = &setclientid,
4024                 .rpc_resp = res,
4025                 .rpc_cred = cred,
4026         };
4027         int loop = 0;
4028         int status;
4029
4030         nfs4_init_boot_verifier(clp, &sc_verifier);
4031
4032         for(;;) {
4033                 rcu_read_lock();
4034                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
4035                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
4036                                 clp->cl_ipaddr,
4037                                 rpc_peeraddr2str(clp->cl_rpcclient,
4038                                                         RPC_DISPLAY_ADDR),
4039                                 rpc_peeraddr2str(clp->cl_rpcclient,
4040                                                         RPC_DISPLAY_PROTO),
4041                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4042                                 clp->cl_id_uniquifier);
4043                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4044                                 sizeof(setclientid.sc_netid),
4045                                 rpc_peeraddr2str(clp->cl_rpcclient,
4046                                                         RPC_DISPLAY_NETID));
4047                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4048                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4049                                 clp->cl_ipaddr, port >> 8, port & 255);
4050                 rcu_read_unlock();
4051
4052                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4053                 if (status != -NFS4ERR_CLID_INUSE)
4054                         break;
4055                 if (loop != 0) {
4056                         ++clp->cl_id_uniquifier;
4057                         break;
4058                 }
4059                 ++loop;
4060                 ssleep(clp->cl_lease_time / HZ + 1);
4061         }
4062         return status;
4063 }
4064
4065 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4066                 struct nfs4_setclientid_res *arg,
4067                 struct rpc_cred *cred)
4068 {
4069         struct nfs_fsinfo fsinfo;
4070         struct rpc_message msg = {
4071                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4072                 .rpc_argp = arg,
4073                 .rpc_resp = &fsinfo,
4074                 .rpc_cred = cred,
4075         };
4076         unsigned long now;
4077         int status;
4078
4079         now = jiffies;
4080         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4081         if (status == 0) {
4082                 spin_lock(&clp->cl_lock);
4083                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4084                 clp->cl_last_renewal = now;
4085                 spin_unlock(&clp->cl_lock);
4086         }
4087         return status;
4088 }
4089
4090 struct nfs4_delegreturndata {
4091         struct nfs4_delegreturnargs args;
4092         struct nfs4_delegreturnres res;
4093         struct nfs_fh fh;
4094         nfs4_stateid stateid;
4095         unsigned long timestamp;
4096         struct nfs_fattr fattr;
4097         int rpc_status;
4098 };
4099
4100 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4101 {
4102         struct nfs4_delegreturndata *data = calldata;
4103
4104         if (!nfs4_sequence_done(task, &data->res.seq_res))
4105                 return;
4106
4107         switch (task->tk_status) {
4108         case -NFS4ERR_STALE_STATEID:
4109         case -NFS4ERR_EXPIRED:
4110         case 0:
4111                 renew_lease(data->res.server, data->timestamp);
4112                 break;
4113         default:
4114                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4115                                 -EAGAIN) {
4116                         rpc_restart_call_prepare(task);
4117                         return;
4118                 }
4119         }
4120         data->rpc_status = task->tk_status;
4121 }
4122
4123 static void nfs4_delegreturn_release(void *calldata)
4124 {
4125         kfree(calldata);
4126 }
4127
4128 #if defined(CONFIG_NFS_V4_1)
4129 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4130 {
4131         struct nfs4_delegreturndata *d_data;
4132
4133         d_data = (struct nfs4_delegreturndata *)data;
4134
4135         if (nfs4_setup_sequence(d_data->res.server,
4136                                 &d_data->args.seq_args,
4137                                 &d_data->res.seq_res, task))
4138                 return;
4139         rpc_call_start(task);
4140 }
4141 #endif /* CONFIG_NFS_V4_1 */
4142
4143 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4144 #if defined(CONFIG_NFS_V4_1)
4145         .rpc_call_prepare = nfs4_delegreturn_prepare,
4146 #endif /* CONFIG_NFS_V4_1 */
4147         .rpc_call_done = nfs4_delegreturn_done,
4148         .rpc_release = nfs4_delegreturn_release,
4149 };
4150
4151 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4152 {
4153         struct nfs4_delegreturndata *data;
4154         struct nfs_server *server = NFS_SERVER(inode);
4155         struct rpc_task *task;
4156         struct rpc_message msg = {
4157                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4158                 .rpc_cred = cred,
4159         };
4160         struct rpc_task_setup task_setup_data = {
4161                 .rpc_client = server->client,
4162                 .rpc_message = &msg,
4163                 .callback_ops = &nfs4_delegreturn_ops,
4164                 .flags = RPC_TASK_ASYNC,
4165         };
4166         int status = 0;
4167
4168         data = kzalloc(sizeof(*data), GFP_NOFS);
4169         if (data == NULL)
4170                 return -ENOMEM;
4171         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4172         data->args.fhandle = &data->fh;
4173         data->args.stateid = &data->stateid;
4174         data->args.bitmask = server->cache_consistency_bitmask;
4175         nfs_copy_fh(&data->fh, NFS_FH(inode));
4176         nfs4_stateid_copy(&data->stateid, stateid);
4177         data->res.fattr = &data->fattr;
4178         data->res.server = server;
4179         nfs_fattr_init(data->res.fattr);
4180         data->timestamp = jiffies;
4181         data->rpc_status = 0;
4182
4183         task_setup_data.callback_data = data;
4184         msg.rpc_argp = &data->args;
4185         msg.rpc_resp = &data->res;
4186         task = rpc_run_task(&task_setup_data);
4187         if (IS_ERR(task))
4188                 return PTR_ERR(task);
4189         if (!issync)
4190                 goto out;
4191         status = nfs4_wait_for_completion_rpc_task(task);
4192         if (status != 0)
4193                 goto out;
4194         status = data->rpc_status;
4195         if (status == 0)
4196                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4197         else
4198                 nfs_refresh_inode(inode, &data->fattr);
4199 out:
4200         rpc_put_task(task);
4201         return status;
4202 }
4203
4204 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4205 {
4206         struct nfs_server *server = NFS_SERVER(inode);
4207         struct nfs4_exception exception = { };
4208         int err;
4209         do {
4210                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4211                 switch (err) {
4212                         case -NFS4ERR_STALE_STATEID:
4213                         case -NFS4ERR_EXPIRED:
4214                         case 0:
4215                                 return 0;
4216                 }
4217                 err = nfs4_handle_exception(server, err, &exception);
4218         } while (exception.retry);
4219         return err;
4220 }
4221
4222 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4223 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4224
4225 /*
4226  * sleep, with exponential backoff, and retry the LOCK operation.
4227  */
4228 static unsigned long
4229 nfs4_set_lock_task_retry(unsigned long timeout)
4230 {
4231         freezable_schedule_timeout_killable(timeout);
4232         timeout <<= 1;
4233         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4234                 return NFS4_LOCK_MAXTIMEOUT;
4235         return timeout;
4236 }
4237
4238 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4239 {
4240         struct inode *inode = state->inode;
4241         struct nfs_server *server = NFS_SERVER(inode);
4242         struct nfs_client *clp = server->nfs_client;
4243         struct nfs_lockt_args arg = {
4244                 .fh = NFS_FH(inode),
4245                 .fl = request,
4246         };
4247         struct nfs_lockt_res res = {
4248                 .denied = request,
4249         };
4250         struct rpc_message msg = {
4251                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4252                 .rpc_argp       = &arg,
4253                 .rpc_resp       = &res,
4254                 .rpc_cred       = state->owner->so_cred,
4255         };
4256         struct nfs4_lock_state *lsp;
4257         int status;
4258
4259         arg.lock_owner.clientid = clp->cl_clientid;
4260         status = nfs4_set_lock_state(state, request);
4261         if (status != 0)
4262                 goto out;
4263         lsp = request->fl_u.nfs4_fl.owner;
4264         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4265         arg.lock_owner.s_dev = server->s_dev;
4266         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4267         switch (status) {
4268                 case 0:
4269                         request->fl_type = F_UNLCK;
4270                         break;
4271                 case -NFS4ERR_DENIED:
4272                         status = 0;
4273         }
4274         request->fl_ops->fl_release_private(request);
4275 out:
4276         return status;
4277 }
4278
4279 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4280 {
4281         struct nfs4_exception exception = { };
4282         int err;
4283
4284         do {
4285                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4286                                 _nfs4_proc_getlk(state, cmd, request),
4287                                 &exception);
4288         } while (exception.retry);
4289         return err;
4290 }
4291
4292 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4293 {
4294         int res = 0;
4295         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4296                 case FL_POSIX:
4297                         res = posix_lock_file_wait(file, fl);
4298                         break;
4299                 case FL_FLOCK:
4300                         res = flock_lock_file_wait(file, fl);
4301                         break;
4302                 default:
4303                         BUG();
4304         }
4305         return res;
4306 }
4307
4308 struct nfs4_unlockdata {
4309         struct nfs_locku_args arg;
4310         struct nfs_locku_res res;
4311         struct nfs4_lock_state *lsp;
4312         struct nfs_open_context *ctx;
4313         struct file_lock fl;
4314         const struct nfs_server *server;
4315         unsigned long timestamp;
4316 };
4317
4318 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4319                 struct nfs_open_context *ctx,
4320                 struct nfs4_lock_state *lsp,
4321                 struct nfs_seqid *seqid)
4322 {
4323         struct nfs4_unlockdata *p;
4324         struct inode *inode = lsp->ls_state->inode;
4325
4326         p = kzalloc(sizeof(*p), GFP_NOFS);
4327         if (p == NULL)
4328                 return NULL;
4329         p->arg.fh = NFS_FH(inode);
4330         p->arg.fl = &p->fl;
4331         p->arg.seqid = seqid;
4332         p->res.seqid = seqid;
4333         p->arg.stateid = &lsp->ls_stateid;
4334         p->lsp = lsp;
4335         atomic_inc(&lsp->ls_count);
4336         /* Ensure we don't close file until we're done freeing locks! */
4337         p->ctx = get_nfs_open_context(ctx);
4338         memcpy(&p->fl, fl, sizeof(p->fl));
4339         p->server = NFS_SERVER(inode);
4340         return p;
4341 }
4342
4343 static void nfs4_locku_release_calldata(void *data)
4344 {
4345         struct nfs4_unlockdata *calldata = data;
4346         nfs_free_seqid(calldata->arg.seqid);
4347         nfs4_put_lock_state(calldata->lsp);
4348         put_nfs_open_context(calldata->ctx);
4349         kfree(calldata);
4350 }
4351
4352 static void nfs4_locku_done(struct rpc_task *task, void *data)
4353 {
4354         struct nfs4_unlockdata *calldata = data;
4355
4356         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4357                 return;
4358         switch (task->tk_status) {
4359                 case 0:
4360                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4361                                         &calldata->res.stateid);
4362                         renew_lease(calldata->server, calldata->timestamp);
4363                         break;
4364                 case -NFS4ERR_BAD_STATEID:
4365                 case -NFS4ERR_OLD_STATEID:
4366                 case -NFS4ERR_STALE_STATEID:
4367                 case -NFS4ERR_EXPIRED:
4368                         break;
4369                 default:
4370                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4371                                 rpc_restart_call_prepare(task);
4372         }
4373 }
4374
4375 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4376 {
4377         struct nfs4_unlockdata *calldata = data;
4378
4379         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4380                 return;
4381         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4382                 /* Note: exit _without_ running nfs4_locku_done */
4383                 task->tk_action = NULL;
4384                 return;
4385         }
4386         calldata->timestamp = jiffies;
4387         if (nfs4_setup_sequence(calldata->server,
4388                                 &calldata->arg.seq_args,
4389                                 &calldata->res.seq_res, task))
4390                 return;
4391         rpc_call_start(task);
4392 }
4393
4394 static const struct rpc_call_ops nfs4_locku_ops = {
4395         .rpc_call_prepare = nfs4_locku_prepare,
4396         .rpc_call_done = nfs4_locku_done,
4397         .rpc_release = nfs4_locku_release_calldata,
4398 };
4399
4400 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4401                 struct nfs_open_context *ctx,
4402                 struct nfs4_lock_state *lsp,
4403                 struct nfs_seqid *seqid)
4404 {
4405         struct nfs4_unlockdata *data;
4406         struct rpc_message msg = {
4407                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4408                 .rpc_cred = ctx->cred,
4409         };
4410         struct rpc_task_setup task_setup_data = {
4411                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4412                 .rpc_message = &msg,
4413                 .callback_ops = &nfs4_locku_ops,
4414                 .workqueue = nfsiod_workqueue,
4415                 .flags = RPC_TASK_ASYNC,
4416         };
4417
4418         /* Ensure this is an unlock - when canceling a lock, the
4419          * canceled lock is passed in, and it won't be an unlock.
4420          */
4421         fl->fl_type = F_UNLCK;
4422
4423         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4424         if (data == NULL) {
4425                 nfs_free_seqid(seqid);
4426                 return ERR_PTR(-ENOMEM);
4427         }
4428
4429         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4430         msg.rpc_argp = &data->arg;
4431         msg.rpc_resp = &data->res;
4432         task_setup_data.callback_data = data;
4433         return rpc_run_task(&task_setup_data);
4434 }
4435
4436 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4437 {
4438         struct nfs_inode *nfsi = NFS_I(state->inode);
4439         struct nfs_seqid *seqid;
4440         struct nfs4_lock_state *lsp;
4441         struct rpc_task *task;
4442         int status = 0;
4443         unsigned char fl_flags = request->fl_flags;
4444
4445         status = nfs4_set_lock_state(state, request);
4446         /* Unlock _before_ we do the RPC call */
4447         request->fl_flags |= FL_EXISTS;
4448         down_read(&nfsi->rwsem);
4449         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4450                 up_read(&nfsi->rwsem);
4451                 goto out;
4452         }
4453         up_read(&nfsi->rwsem);
4454         if (status != 0)
4455                 goto out;
4456         /* Is this a delegated lock? */
4457         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4458                 goto out;
4459         lsp = request->fl_u.nfs4_fl.owner;
4460         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4461         status = -ENOMEM;
4462         if (seqid == NULL)
4463                 goto out;
4464         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4465         status = PTR_ERR(task);
4466         if (IS_ERR(task))
4467                 goto out;
4468         status = nfs4_wait_for_completion_rpc_task(task);
4469         rpc_put_task(task);
4470 out:
4471         request->fl_flags = fl_flags;
4472         return status;
4473 }
4474
4475 struct nfs4_lockdata {
4476         struct nfs_lock_args arg;
4477         struct nfs_lock_res res;
4478         struct nfs4_lock_state *lsp;
4479         struct nfs_open_context *ctx;
4480         struct file_lock fl;
4481         unsigned long timestamp;
4482         int rpc_status;
4483         int cancelled;
4484         struct nfs_server *server;
4485 };
4486
4487 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4488                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4489                 gfp_t gfp_mask)
4490 {
4491         struct nfs4_lockdata *p;
4492         struct inode *inode = lsp->ls_state->inode;
4493         struct nfs_server *server = NFS_SERVER(inode);
4494
4495         p = kzalloc(sizeof(*p), gfp_mask);
4496         if (p == NULL)
4497                 return NULL;
4498
4499         p->arg.fh = NFS_FH(inode);
4500         p->arg.fl = &p->fl;
4501         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4502         if (p->arg.open_seqid == NULL)
4503                 goto out_free;
4504         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4505         if (p->arg.lock_seqid == NULL)
4506                 goto out_free_seqid;
4507         p->arg.lock_stateid = &lsp->ls_stateid;
4508         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4509         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4510         p->arg.lock_owner.s_dev = server->s_dev;
4511         p->res.lock_seqid = p->arg.lock_seqid;
4512         p->lsp = lsp;
4513         p->server = server;
4514         atomic_inc(&lsp->ls_count);
4515         p->ctx = get_nfs_open_context(ctx);
4516         memcpy(&p->fl, fl, sizeof(p->fl));
4517         return p;
4518 out_free_seqid:
4519         nfs_free_seqid(p->arg.open_seqid);
4520 out_free:
4521         kfree(p);
4522         return NULL;
4523 }
4524
4525 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4526 {
4527         struct nfs4_lockdata *data = calldata;
4528         struct nfs4_state *state = data->lsp->ls_state;
4529
4530         dprintk("%s: begin!\n", __func__);
4531         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4532                 return;
4533         /* Do we need to do an open_to_lock_owner? */
4534         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4535                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4536                         return;
4537                 data->arg.open_stateid = &state->stateid;
4538                 data->arg.new_lock_owner = 1;
4539                 data->res.open_seqid = data->arg.open_seqid;
4540         } else
4541                 data->arg.new_lock_owner = 0;
4542         data->timestamp = jiffies;
4543         if (nfs4_setup_sequence(data->server,
4544                                 &data->arg.seq_args,
4545                                 &data->res.seq_res, task))
4546                 return;
4547         rpc_call_start(task);
4548         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4549 }
4550
4551 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4552 {
4553         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4554         nfs4_lock_prepare(task, calldata);
4555 }
4556
4557 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4558 {
4559         struct nfs4_lockdata *data = calldata;
4560
4561         dprintk("%s: begin!\n", __func__);
4562
4563         if (!nfs4_sequence_done(task, &data->res.seq_res))
4564                 return;
4565
4566         data->rpc_status = task->tk_status;
4567         if (data->arg.new_lock_owner != 0) {
4568                 if (data->rpc_status == 0)
4569                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4570                 else
4571                         goto out;
4572         }
4573         if (data->rpc_status == 0) {
4574                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4575                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4576                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4577         }
4578 out:
4579         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4580 }
4581
4582 static void nfs4_lock_release(void *calldata)
4583 {
4584         struct nfs4_lockdata *data = calldata;
4585
4586         dprintk("%s: begin!\n", __func__);
4587         nfs_free_seqid(data->arg.open_seqid);
4588         if (data->cancelled != 0) {
4589                 struct rpc_task *task;
4590                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4591                                 data->arg.lock_seqid);
4592                 if (!IS_ERR(task))
4593                         rpc_put_task_async(task);
4594                 dprintk("%s: cancelling lock!\n", __func__);
4595         } else
4596                 nfs_free_seqid(data->arg.lock_seqid);
4597         nfs4_put_lock_state(data->lsp);
4598         put_nfs_open_context(data->ctx);
4599         kfree(data);
4600         dprintk("%s: done!\n", __func__);
4601 }
4602
4603 static const struct rpc_call_ops nfs4_lock_ops = {
4604         .rpc_call_prepare = nfs4_lock_prepare,
4605         .rpc_call_done = nfs4_lock_done,
4606         .rpc_release = nfs4_lock_release,
4607 };
4608
4609 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4610         .rpc_call_prepare = nfs4_recover_lock_prepare,
4611         .rpc_call_done = nfs4_lock_done,
4612         .rpc_release = nfs4_lock_release,
4613 };
4614
4615 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4616 {
4617         switch (error) {
4618         case -NFS4ERR_ADMIN_REVOKED:
4619         case -NFS4ERR_BAD_STATEID:
4620                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4621                 if (new_lock_owner != 0 ||
4622                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4623                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4624                 break;
4625         case -NFS4ERR_STALE_STATEID:
4626                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4627         case -NFS4ERR_EXPIRED:
4628                 nfs4_schedule_lease_recovery(server->nfs_client);
4629         };
4630 }
4631
4632 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4633 {
4634         struct nfs4_lockdata *data;
4635         struct rpc_task *task;
4636         struct rpc_message msg = {
4637                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4638                 .rpc_cred = state->owner->so_cred,
4639         };
4640         struct rpc_task_setup task_setup_data = {
4641                 .rpc_client = NFS_CLIENT(state->inode),
4642                 .rpc_message = &msg,
4643                 .callback_ops = &nfs4_lock_ops,
4644                 .workqueue = nfsiod_workqueue,
4645                 .flags = RPC_TASK_ASYNC,
4646         };
4647         int ret;
4648
4649         dprintk("%s: begin!\n", __func__);
4650         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4651                         fl->fl_u.nfs4_fl.owner,
4652                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4653         if (data == NULL)
4654                 return -ENOMEM;
4655         if (IS_SETLKW(cmd))
4656                 data->arg.block = 1;
4657         if (recovery_type > NFS_LOCK_NEW) {
4658                 if (recovery_type == NFS_LOCK_RECLAIM)
4659                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4660                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4661         }
4662         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4663         msg.rpc_argp = &data->arg;
4664         msg.rpc_resp = &data->res;
4665         task_setup_data.callback_data = data;
4666         task = rpc_run_task(&task_setup_data);
4667         if (IS_ERR(task))
4668                 return PTR_ERR(task);
4669         ret = nfs4_wait_for_completion_rpc_task(task);
4670         if (ret == 0) {
4671                 ret = data->rpc_status;
4672                 if (ret)
4673                         nfs4_handle_setlk_error(data->server, data->lsp,
4674                                         data->arg.new_lock_owner, ret);
4675         } else
4676                 data->cancelled = 1;
4677         rpc_put_task(task);
4678         dprintk("%s: done, ret = %d!\n", __func__, ret);
4679         return ret;
4680 }
4681
4682 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4683 {
4684         struct nfs_server *server = NFS_SERVER(state->inode);
4685         struct nfs4_exception exception = {
4686                 .inode = state->inode,
4687         };
4688         int err;
4689
4690         do {
4691                 /* Cache the lock if possible... */
4692                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4693                         return 0;
4694                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4695                 if (err != -NFS4ERR_DELAY)
4696                         break;
4697                 nfs4_handle_exception(server, err, &exception);
4698         } while (exception.retry);
4699         return err;
4700 }
4701
4702 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4703 {
4704         struct nfs_server *server = NFS_SERVER(state->inode);
4705         struct nfs4_exception exception = {
4706                 .inode = state->inode,
4707         };
4708         int err;
4709
4710         err = nfs4_set_lock_state(state, request);
4711         if (err != 0)
4712                 return err;
4713         do {
4714                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4715                         return 0;
4716                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4717                 switch (err) {
4718                 default:
4719                         goto out;
4720                 case -NFS4ERR_GRACE:
4721                 case -NFS4ERR_DELAY:
4722                         nfs4_handle_exception(server, err, &exception);
4723                         err = 0;
4724                 }
4725         } while (exception.retry);
4726 out:
4727         return err;
4728 }
4729
4730 #if defined(CONFIG_NFS_V4_1)
4731 /**
4732  * nfs41_check_expired_locks - possibly free a lock stateid
4733  *
4734  * @state: NFSv4 state for an inode
4735  *
4736  * Returns NFS_OK if recovery for this stateid is now finished.
4737  * Otherwise a negative NFS4ERR value is returned.
4738  */
4739 static int nfs41_check_expired_locks(struct nfs4_state *state)
4740 {
4741         int status, ret = -NFS4ERR_BAD_STATEID;
4742         struct nfs4_lock_state *lsp;
4743         struct nfs_server *server = NFS_SERVER(state->inode);
4744
4745         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4746                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4747                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4748                         if (status != NFS_OK) {
4749                                 /* Free the stateid unless the server
4750                                  * informs us the stateid is unrecognized. */
4751                                 if (status != -NFS4ERR_BAD_STATEID)
4752                                         nfs41_free_stateid(server,
4753                                                         &lsp->ls_stateid);
4754                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4755                                 ret = status;
4756                         }
4757                 }
4758         };
4759
4760         return ret;
4761 }
4762
4763 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4764 {
4765         int status = NFS_OK;
4766
4767         if (test_bit(LK_STATE_IN_USE, &state->flags))
4768                 status = nfs41_check_expired_locks(state);
4769         if (status != NFS_OK)
4770                 status = nfs4_lock_expired(state, request);
4771         return status;
4772 }
4773 #endif
4774
4775 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4776 {
4777         struct nfs_inode *nfsi = NFS_I(state->inode);
4778         unsigned char fl_flags = request->fl_flags;
4779         int status = -ENOLCK;
4780
4781         if ((fl_flags & FL_POSIX) &&
4782                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4783                 goto out;
4784         /* Is this a delegated open? */
4785         status = nfs4_set_lock_state(state, request);
4786         if (status != 0)
4787                 goto out;
4788         request->fl_flags |= FL_ACCESS;
4789         status = do_vfs_lock(request->fl_file, request);
4790         if (status < 0)
4791                 goto out;
4792         down_read(&nfsi->rwsem);
4793         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4794                 /* Yes: cache locks! */
4795                 /* ...but avoid races with delegation recall... */
4796                 request->fl_flags = fl_flags & ~FL_SLEEP;
4797                 status = do_vfs_lock(request->fl_file, request);
4798                 goto out_unlock;
4799         }
4800         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4801         if (status != 0)
4802                 goto out_unlock;
4803         /* Note: we always want to sleep here! */
4804         request->fl_flags = fl_flags | FL_SLEEP;
4805         if (do_vfs_lock(request->fl_file, request) < 0)
4806                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4807                         "manager!\n", __func__);
4808 out_unlock:
4809         up_read(&nfsi->rwsem);
4810 out:
4811         request->fl_flags = fl_flags;
4812         return status;
4813 }
4814
4815 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4816 {
4817         struct nfs4_exception exception = {
4818                 .state = state,
4819                 .inode = state->inode,
4820         };
4821         int err;
4822
4823         do {
4824                 err = _nfs4_proc_setlk(state, cmd, request);
4825                 if (err == -NFS4ERR_DENIED)
4826                         err = -EAGAIN;
4827                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4828                                 err, &exception);
4829         } while (exception.retry);
4830         return err;
4831 }
4832
4833 static int
4834 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4835 {
4836         struct nfs_open_context *ctx;
4837         struct nfs4_state *state;
4838         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4839         int status;
4840
4841         /* verify open state */
4842         ctx = nfs_file_open_context(filp);
4843         state = ctx->state;
4844
4845         if (request->fl_start < 0 || request->fl_end < 0)
4846                 return -EINVAL;
4847
4848         if (IS_GETLK(cmd)) {
4849                 if (state != NULL)
4850                         return nfs4_proc_getlk(state, F_GETLK, request);
4851                 return 0;
4852         }
4853
4854         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4855                 return -EINVAL;
4856
4857         if (request->fl_type == F_UNLCK) {
4858                 if (state != NULL)
4859                         return nfs4_proc_unlck(state, cmd, request);
4860                 return 0;
4861         }
4862
4863         if (state == NULL)
4864                 return -ENOLCK;
4865         /*
4866          * Don't rely on the VFS having checked the file open mode,
4867          * since it won't do this for flock() locks.
4868          */
4869         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4870         case F_RDLCK:
4871                 if (!(filp->f_mode & FMODE_READ))
4872                         return -EBADF;
4873                 break;
4874         case F_WRLCK:
4875                 if (!(filp->f_mode & FMODE_WRITE))
4876                         return -EBADF;
4877         }
4878
4879         do {
4880                 status = nfs4_proc_setlk(state, cmd, request);
4881                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4882                         break;
4883                 timeout = nfs4_set_lock_task_retry(timeout);
4884                 status = -ERESTARTSYS;
4885                 if (signalled())
4886                         break;
4887         } while(status < 0);
4888         return status;
4889 }
4890
4891 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4892 {
4893         struct nfs_server *server = NFS_SERVER(state->inode);
4894         struct nfs4_exception exception = { };
4895         int err;
4896
4897         err = nfs4_set_lock_state(state, fl);
4898         if (err != 0)
4899                 goto out;
4900         do {
4901                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4902                 switch (err) {
4903                         default:
4904                                 printk(KERN_ERR "NFS: %s: unhandled error "
4905                                         "%d.\n", __func__, err);
4906                         case 0:
4907                         case -ESTALE:
4908                                 goto out;
4909                         case -NFS4ERR_EXPIRED:
4910                                 nfs4_schedule_stateid_recovery(server, state);
4911                         case -NFS4ERR_STALE_CLIENTID:
4912                         case -NFS4ERR_STALE_STATEID:
4913                                 nfs4_schedule_lease_recovery(server->nfs_client);
4914                                 goto out;
4915                         case -NFS4ERR_BADSESSION:
4916                         case -NFS4ERR_BADSLOT:
4917                         case -NFS4ERR_BAD_HIGH_SLOT:
4918                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4919                         case -NFS4ERR_DEADSESSION:
4920                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4921                                 goto out;
4922                         case -ERESTARTSYS:
4923                                 /*
4924                                  * The show must go on: exit, but mark the
4925                                  * stateid as needing recovery.
4926                                  */
4927                         case -NFS4ERR_DELEG_REVOKED:
4928                         case -NFS4ERR_ADMIN_REVOKED:
4929                         case -NFS4ERR_BAD_STATEID:
4930                         case -NFS4ERR_OPENMODE:
4931                                 nfs4_schedule_stateid_recovery(server, state);
4932                                 err = 0;
4933                                 goto out;
4934                         case -EKEYEXPIRED:
4935                                 /*
4936                                  * User RPCSEC_GSS context has expired.
4937                                  * We cannot recover this stateid now, so
4938                                  * skip it and allow recovery thread to
4939                                  * proceed.
4940                                  */
4941                                 err = 0;
4942                                 goto out;
4943                         case -ENOMEM:
4944                         case -NFS4ERR_DENIED:
4945                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4946                                 err = 0;
4947                                 goto out;
4948                         case -NFS4ERR_DELAY:
4949                                 break;
4950                 }
4951                 err = nfs4_handle_exception(server, err, &exception);
4952         } while (exception.retry);
4953 out:
4954         return err;
4955 }
4956
4957 struct nfs_release_lockowner_data {
4958         struct nfs4_lock_state *lsp;
4959         struct nfs_server *server;
4960         struct nfs_release_lockowner_args args;
4961 };
4962
4963 static void nfs4_release_lockowner_release(void *calldata)
4964 {
4965         struct nfs_release_lockowner_data *data = calldata;
4966         nfs4_free_lock_state(data->server, data->lsp);
4967         kfree(calldata);
4968 }
4969
4970 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4971         .rpc_release = nfs4_release_lockowner_release,
4972 };
4973
4974 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4975 {
4976         struct nfs_server *server = lsp->ls_state->owner->so_server;
4977         struct nfs_release_lockowner_data *data;
4978         struct rpc_message msg = {
4979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4980         };
4981
4982         if (server->nfs_client->cl_mvops->minor_version != 0)
4983                 return -EINVAL;
4984         data = kmalloc(sizeof(*data), GFP_NOFS);
4985         if (!data)
4986                 return -ENOMEM;
4987         data->lsp = lsp;
4988         data->server = server;
4989         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4990         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4991         data->args.lock_owner.s_dev = server->s_dev;
4992         msg.rpc_argp = &data->args;
4993         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4994         return 0;
4995 }
4996
4997 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4998
4999 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5000                                    const void *buf, size_t buflen,
5001                                    int flags, int type)
5002 {
5003         if (strcmp(key, "") != 0)
5004                 return -EINVAL;
5005
5006         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5007 }
5008
5009 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5010                                    void *buf, size_t buflen, int type)
5011 {
5012         if (strcmp(key, "") != 0)
5013                 return -EINVAL;
5014
5015         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5016 }
5017
5018 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5019                                        size_t list_len, const char *name,
5020                                        size_t name_len, int type)
5021 {
5022         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5023
5024         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5025                 return 0;
5026
5027         if (list && len <= list_len)
5028                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5029         return len;
5030 }
5031
5032 /*
5033  * nfs_fhget will use either the mounted_on_fileid or the fileid
5034  */
5035 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5036 {
5037         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5038                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5039               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5040               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5041                 return;
5042
5043         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5044                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5045         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5046         fattr->nlink = 2;
5047 }
5048
5049 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5050                                    const struct qstr *name,
5051                                    struct nfs4_fs_locations *fs_locations,
5052                                    struct page *page)
5053 {
5054         struct nfs_server *server = NFS_SERVER(dir);
5055         u32 bitmask[2] = {
5056                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5057         };
5058         struct nfs4_fs_locations_arg args = {
5059                 .dir_fh = NFS_FH(dir),
5060                 .name = name,
5061                 .page = page,
5062                 .bitmask = bitmask,
5063         };
5064         struct nfs4_fs_locations_res res = {
5065                 .fs_locations = fs_locations,
5066         };
5067         struct rpc_message msg = {
5068                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5069                 .rpc_argp = &args,
5070                 .rpc_resp = &res,
5071         };
5072         int status;
5073
5074         dprintk("%s: start\n", __func__);
5075
5076         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5077          * is not supported */
5078         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5079                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5080         else
5081                 bitmask[0] |= FATTR4_WORD0_FILEID;
5082
5083         nfs_fattr_init(&fs_locations->fattr);
5084         fs_locations->server = server;
5085         fs_locations->nlocations = 0;
5086         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5087         dprintk("%s: returned status = %d\n", __func__, status);
5088         return status;
5089 }
5090
5091 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5092                            const struct qstr *name,
5093                            struct nfs4_fs_locations *fs_locations,
5094                            struct page *page)
5095 {
5096         struct nfs4_exception exception = { };
5097         int err;
5098         do {
5099                 err = nfs4_handle_exception(NFS_SERVER(dir),
5100                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5101                                 &exception);
5102         } while (exception.retry);
5103         return err;
5104 }
5105
5106 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5107 {
5108         int status;
5109         struct nfs4_secinfo_arg args = {
5110                 .dir_fh = NFS_FH(dir),
5111                 .name   = name,
5112         };
5113         struct nfs4_secinfo_res res = {
5114                 .flavors     = flavors,
5115         };
5116         struct rpc_message msg = {
5117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5118                 .rpc_argp = &args,
5119                 .rpc_resp = &res,
5120         };
5121
5122         dprintk("NFS call  secinfo %s\n", name->name);
5123         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5124         dprintk("NFS reply  secinfo: %d\n", status);
5125         return status;
5126 }
5127
5128 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5129                       struct nfs4_secinfo_flavors *flavors)
5130 {
5131         struct nfs4_exception exception = { };
5132         int err;
5133         do {
5134                 err = nfs4_handle_exception(NFS_SERVER(dir),
5135                                 _nfs4_proc_secinfo(dir, name, flavors),
5136                                 &exception);
5137         } while (exception.retry);
5138         return err;
5139 }
5140
5141 #ifdef CONFIG_NFS_V4_1
5142 /*
5143  * Check the exchange flags returned by the server for invalid flags, having
5144  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5145  * DS flags set.
5146  */
5147 static int nfs4_check_cl_exchange_flags(u32 flags)
5148 {
5149         if (flags & ~EXCHGID4_FLAG_MASK_R)
5150                 goto out_inval;
5151         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5152             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5153                 goto out_inval;
5154         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5155                 goto out_inval;
5156         return NFS_OK;
5157 out_inval:
5158         return -NFS4ERR_INVAL;
5159 }
5160
5161 static bool
5162 nfs41_same_server_scope(struct nfs41_server_scope *a,
5163                         struct nfs41_server_scope *b)
5164 {
5165         if (a->server_scope_sz == b->server_scope_sz &&
5166             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5167                 return true;
5168
5169         return false;
5170 }
5171
5172 /*
5173  * nfs4_proc_bind_conn_to_session()
5174  *
5175  * The 4.1 client currently uses the same TCP connection for the
5176  * fore and backchannel.
5177  */
5178 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5179 {
5180         int status;
5181         struct nfs41_bind_conn_to_session_res res;
5182         struct rpc_message msg = {
5183                 .rpc_proc =
5184                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5185                 .rpc_argp = clp,
5186                 .rpc_resp = &res,
5187                 .rpc_cred = cred,
5188         };
5189
5190         dprintk("--> %s\n", __func__);
5191         BUG_ON(clp == NULL);
5192
5193         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5194         if (unlikely(res.session == NULL)) {
5195                 status = -ENOMEM;
5196                 goto out;
5197         }
5198
5199         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5200         if (status == 0) {
5201                 if (memcmp(res.session->sess_id.data,
5202                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5203                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5204                         status = -EIO;
5205                         goto out_session;
5206                 }
5207                 if (res.dir != NFS4_CDFS4_BOTH) {
5208                         dprintk("NFS: %s: Unexpected direction from server\n",
5209                                 __func__);
5210                         status = -EIO;
5211                         goto out_session;
5212                 }
5213                 if (res.use_conn_in_rdma_mode) {
5214                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5215                                 __func__);
5216                         status = -EIO;
5217                         goto out_session;
5218                 }
5219         }
5220 out_session:
5221         kfree(res.session);
5222 out:
5223         dprintk("<-- %s status= %d\n", __func__, status);
5224         return status;
5225 }
5226
5227 /*
5228  * nfs4_proc_exchange_id()
5229  *
5230  * Since the clientid has expired, all compounds using sessions
5231  * associated with the stale clientid will be returning
5232  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5233  * be in some phase of session reset.
5234  */
5235 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5236 {
5237         nfs4_verifier verifier;
5238         struct nfs41_exchange_id_args args = {
5239                 .verifier = &verifier,
5240                 .client = clp,
5241                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5242         };
5243         struct nfs41_exchange_id_res res = {
5244                 0
5245         };
5246         int status;
5247         struct rpc_message msg = {
5248                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5249                 .rpc_argp = &args,
5250                 .rpc_resp = &res,
5251                 .rpc_cred = cred,
5252         };
5253
5254         dprintk("--> %s\n", __func__);
5255         BUG_ON(clp == NULL);
5256
5257         nfs4_init_boot_verifier(clp, &verifier);
5258
5259         args.id_len = scnprintf(args.id, sizeof(args.id),
5260                                 "%s/%s/%u",
5261                                 clp->cl_ipaddr,
5262                                 clp->cl_rpcclient->cl_nodename,
5263                                 clp->cl_rpcclient->cl_auth->au_flavor);
5264
5265         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5266                                         GFP_NOFS);
5267         if (unlikely(res.server_owner == NULL)) {
5268                 status = -ENOMEM;
5269                 goto out;
5270         }
5271
5272         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5273                                         GFP_NOFS);
5274         if (unlikely(res.server_scope == NULL)) {
5275                 status = -ENOMEM;
5276                 goto out_server_owner;
5277         }
5278
5279         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5280         if (unlikely(res.impl_id == NULL)) {
5281                 status = -ENOMEM;
5282                 goto out_server_scope;
5283         }
5284
5285         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5286         if (status == 0)
5287                 status = nfs4_check_cl_exchange_flags(res.flags);
5288
5289         if (status == 0) {
5290                 clp->cl_clientid = res.clientid;
5291                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5292                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5293                         clp->cl_seqid = res.seqid;
5294
5295                 kfree(clp->cl_serverowner);
5296                 clp->cl_serverowner = res.server_owner;
5297                 res.server_owner = NULL;
5298
5299                 /* use the most recent implementation id */
5300                 kfree(clp->cl_implid);
5301                 clp->cl_implid = res.impl_id;
5302
5303                 if (clp->cl_serverscope != NULL &&
5304                     !nfs41_same_server_scope(clp->cl_serverscope,
5305                                              res.server_scope)) {
5306                         dprintk("%s: server_scope mismatch detected\n",
5307                                 __func__);
5308                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5309                         kfree(clp->cl_serverscope);
5310                         clp->cl_serverscope = NULL;
5311                 }
5312
5313                 if (clp->cl_serverscope == NULL) {
5314                         clp->cl_serverscope = res.server_scope;
5315                         goto out;
5316                 }
5317         } else
5318                 kfree(res.impl_id);
5319
5320 out_server_owner:
5321         kfree(res.server_owner);
5322 out_server_scope:
5323         kfree(res.server_scope);
5324 out:
5325         if (clp->cl_implid != NULL)
5326                 dprintk("%s: Server Implementation ID: "
5327                         "domain: %s, name: %s, date: %llu,%u\n",
5328                         __func__, clp->cl_implid->domain, clp->cl_implid->name,
5329                         clp->cl_implid->date.seconds,
5330                         clp->cl_implid->date.nseconds);
5331         dprintk("<-- %s status= %d\n", __func__, status);
5332         return status;
5333 }
5334
5335 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5336                 struct rpc_cred *cred)
5337 {
5338         struct rpc_message msg = {
5339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5340                 .rpc_argp = clp,
5341                 .rpc_cred = cred,
5342         };
5343         int status;
5344
5345         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5346         if (status)
5347                 dprintk("NFS: Got error %d from the server %s on "
5348                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5349         return status;
5350 }
5351
5352 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5353                 struct rpc_cred *cred)
5354 {
5355         unsigned int loop;
5356         int ret;
5357
5358         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5359                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5360                 switch (ret) {
5361                 case -NFS4ERR_DELAY:
5362                 case -NFS4ERR_CLIENTID_BUSY:
5363                         ssleep(1);
5364                         break;
5365                 default:
5366                         return ret;
5367                 }
5368         }
5369         return 0;
5370 }
5371
5372 int nfs4_destroy_clientid(struct nfs_client *clp)
5373 {
5374         struct rpc_cred *cred;
5375         int ret = 0;
5376
5377         if (clp->cl_mvops->minor_version < 1)
5378                 goto out;
5379         if (clp->cl_exchange_flags == 0)
5380                 goto out;
5381         cred = nfs4_get_exchange_id_cred(clp);
5382         ret = nfs4_proc_destroy_clientid(clp, cred);
5383         if (cred)
5384                 put_rpccred(cred);
5385         switch (ret) {
5386         case 0:
5387         case -NFS4ERR_STALE_CLIENTID:
5388                 clp->cl_exchange_flags = 0;
5389         }
5390 out:
5391         return ret;
5392 }
5393
5394 struct nfs4_get_lease_time_data {
5395         struct nfs4_get_lease_time_args *args;
5396         struct nfs4_get_lease_time_res *res;
5397         struct nfs_client *clp;
5398 };
5399
5400 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5401                                         void *calldata)
5402 {
5403         int ret;
5404         struct nfs4_get_lease_time_data *data =
5405                         (struct nfs4_get_lease_time_data *)calldata;
5406
5407         dprintk("--> %s\n", __func__);
5408         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5409         /* just setup sequence, do not trigger session recovery
5410            since we're invoked within one */
5411         ret = nfs41_setup_sequence(data->clp->cl_session,
5412                                    &data->args->la_seq_args,
5413                                    &data->res->lr_seq_res, task);
5414
5415         BUG_ON(ret == -EAGAIN);
5416         rpc_call_start(task);
5417         dprintk("<-- %s\n", __func__);
5418 }
5419
5420 /*
5421  * Called from nfs4_state_manager thread for session setup, so don't recover
5422  * from sequence operation or clientid errors.
5423  */
5424 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5425 {
5426         struct nfs4_get_lease_time_data *data =
5427                         (struct nfs4_get_lease_time_data *)calldata;
5428
5429         dprintk("--> %s\n", __func__);
5430         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5431                 return;
5432         switch (task->tk_status) {
5433         case -NFS4ERR_DELAY:
5434         case -NFS4ERR_GRACE:
5435                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5436                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5437                 task->tk_status = 0;
5438                 /* fall through */
5439         case -NFS4ERR_RETRY_UNCACHED_REP:
5440                 rpc_restart_call_prepare(task);
5441                 return;
5442         }
5443         dprintk("<-- %s\n", __func__);
5444 }
5445
5446 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5447         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5448         .rpc_call_done = nfs4_get_lease_time_done,
5449 };
5450
5451 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5452 {
5453         struct rpc_task *task;
5454         struct nfs4_get_lease_time_args args;
5455         struct nfs4_get_lease_time_res res = {
5456                 .lr_fsinfo = fsinfo,
5457         };
5458         struct nfs4_get_lease_time_data data = {
5459                 .args = &args,
5460                 .res = &res,
5461                 .clp = clp,
5462         };
5463         struct rpc_message msg = {
5464                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5465                 .rpc_argp = &args,
5466                 .rpc_resp = &res,
5467         };
5468         struct rpc_task_setup task_setup = {
5469                 .rpc_client = clp->cl_rpcclient,
5470                 .rpc_message = &msg,
5471                 .callback_ops = &nfs4_get_lease_time_ops,
5472                 .callback_data = &data,
5473                 .flags = RPC_TASK_TIMEOUT,
5474         };
5475         int status;
5476
5477         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5478         dprintk("--> %s\n", __func__);
5479         task = rpc_run_task(&task_setup);
5480
5481         if (IS_ERR(task))
5482                 status = PTR_ERR(task);
5483         else {
5484                 status = task->tk_status;
5485                 rpc_put_task(task);
5486         }
5487         dprintk("<-- %s return %d\n", __func__, status);
5488
5489         return status;
5490 }
5491
5492 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5493 {
5494         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5495 }
5496
5497 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5498                 struct nfs4_slot *new,
5499                 u32 max_slots,
5500                 u32 ivalue)
5501 {
5502         struct nfs4_slot *old = NULL;
5503         u32 i;
5504
5505         spin_lock(&tbl->slot_tbl_lock);
5506         if (new) {
5507                 old = tbl->slots;
5508                 tbl->slots = new;
5509                 tbl->max_slots = max_slots;
5510         }
5511         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5512         for (i = 0; i < tbl->max_slots; i++)
5513                 tbl->slots[i].seq_nr = ivalue;
5514         spin_unlock(&tbl->slot_tbl_lock);
5515         kfree(old);
5516 }
5517
5518 /*
5519  * (re)Initialise a slot table
5520  */
5521 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5522                                  u32 ivalue)
5523 {
5524         struct nfs4_slot *new = NULL;
5525         int ret = -ENOMEM;
5526
5527         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5528                 max_reqs, tbl->max_slots);
5529
5530         /* Does the newly negotiated max_reqs match the existing slot table? */
5531         if (max_reqs != tbl->max_slots) {
5532                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5533                 if (!new)
5534                         goto out;
5535         }
5536         ret = 0;
5537
5538         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5539         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5540                 tbl, tbl->slots, tbl->max_slots);
5541 out:
5542         dprintk("<-- %s: return %d\n", __func__, ret);
5543         return ret;
5544 }
5545
5546 /* Destroy the slot table */
5547 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5548 {
5549         if (session->fc_slot_table.slots != NULL) {
5550                 kfree(session->fc_slot_table.slots);
5551                 session->fc_slot_table.slots = NULL;
5552         }
5553         if (session->bc_slot_table.slots != NULL) {
5554                 kfree(session->bc_slot_table.slots);
5555                 session->bc_slot_table.slots = NULL;
5556         }
5557         return;
5558 }
5559
5560 /*
5561  * Initialize or reset the forechannel and backchannel tables
5562  */
5563 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5564 {
5565         struct nfs4_slot_table *tbl;
5566         int status;
5567
5568         dprintk("--> %s\n", __func__);
5569         /* Fore channel */
5570         tbl = &ses->fc_slot_table;
5571         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5572         if (status) /* -ENOMEM */
5573                 return status;
5574         /* Back channel */
5575         tbl = &ses->bc_slot_table;
5576         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5577         if (status && tbl->slots == NULL)
5578                 /* Fore and back channel share a connection so get
5579                  * both slot tables or neither */
5580                 nfs4_destroy_slot_tables(ses);
5581         return status;
5582 }
5583
5584 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5585 {
5586         struct nfs4_session *session;
5587         struct nfs4_slot_table *tbl;
5588
5589         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5590         if (!session)
5591                 return NULL;
5592
5593         tbl = &session->fc_slot_table;
5594         tbl->highest_used_slotid = NFS4_NO_SLOT;
5595         spin_lock_init(&tbl->slot_tbl_lock);
5596         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5597         init_completion(&tbl->complete);
5598
5599         tbl = &session->bc_slot_table;
5600         tbl->highest_used_slotid = NFS4_NO_SLOT;
5601         spin_lock_init(&tbl->slot_tbl_lock);
5602         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5603         init_completion(&tbl->complete);
5604
5605         session->session_state = 1<<NFS4_SESSION_INITING;
5606
5607         session->clp = clp;
5608         return session;
5609 }
5610
5611 void nfs4_destroy_session(struct nfs4_session *session)
5612 {
5613         struct rpc_xprt *xprt;
5614         struct rpc_cred *cred;
5615
5616         cred = nfs4_get_exchange_id_cred(session->clp);
5617         nfs4_proc_destroy_session(session, cred);
5618         if (cred)
5619                 put_rpccred(cred);
5620
5621         rcu_read_lock();
5622         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5623         rcu_read_unlock();
5624         dprintk("%s Destroy backchannel for xprt %p\n",
5625                 __func__, xprt);
5626         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5627         nfs4_destroy_slot_tables(session);
5628         kfree(session);
5629 }
5630
5631 /*
5632  * Initialize the values to be used by the client in CREATE_SESSION
5633  * If nfs4_init_session set the fore channel request and response sizes,
5634  * use them.
5635  *
5636  * Set the back channel max_resp_sz_cached to zero to force the client to
5637  * always set csa_cachethis to FALSE because the current implementation
5638  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5639  */
5640 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5641 {
5642         struct nfs4_session *session = args->client->cl_session;
5643         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5644                      mxresp_sz = session->fc_attrs.max_resp_sz;
5645
5646         if (mxrqst_sz == 0)
5647                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5648         if (mxresp_sz == 0)
5649                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5650         /* Fore channel attributes */
5651         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5652         args->fc_attrs.max_resp_sz = mxresp_sz;
5653         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5654         args->fc_attrs.max_reqs = max_session_slots;
5655
5656         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5657                 "max_ops=%u max_reqs=%u\n",
5658                 __func__,
5659                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5660                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5661
5662         /* Back channel attributes */
5663         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5664         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5665         args->bc_attrs.max_resp_sz_cached = 0;
5666         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5667         args->bc_attrs.max_reqs = 1;
5668
5669         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5670                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5671                 __func__,
5672                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5673                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5674                 args->bc_attrs.max_reqs);
5675 }
5676
5677 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5678 {
5679         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5680         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5681
5682         if (rcvd->max_resp_sz > sent->max_resp_sz)
5683                 return -EINVAL;
5684         /*
5685          * Our requested max_ops is the minimum we need; we're not
5686          * prepared to break up compounds into smaller pieces than that.
5687          * So, no point even trying to continue if the server won't
5688          * cooperate:
5689          */
5690         if (rcvd->max_ops < sent->max_ops)
5691                 return -EINVAL;
5692         if (rcvd->max_reqs == 0)
5693                 return -EINVAL;
5694         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5695                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5696         return 0;
5697 }
5698
5699 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5700 {
5701         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5702         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5703
5704         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5705                 return -EINVAL;
5706         if (rcvd->max_resp_sz < sent->max_resp_sz)
5707                 return -EINVAL;
5708         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5709                 return -EINVAL;
5710         /* These would render the backchannel useless: */
5711         if (rcvd->max_ops != sent->max_ops)
5712                 return -EINVAL;
5713         if (rcvd->max_reqs != sent->max_reqs)
5714                 return -EINVAL;
5715         return 0;
5716 }
5717
5718 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5719                                      struct nfs4_session *session)
5720 {
5721         int ret;
5722
5723         ret = nfs4_verify_fore_channel_attrs(args, session);
5724         if (ret)
5725                 return ret;
5726         return nfs4_verify_back_channel_attrs(args, session);
5727 }
5728
5729 static int _nfs4_proc_create_session(struct nfs_client *clp,
5730                 struct rpc_cred *cred)
5731 {
5732         struct nfs4_session *session = clp->cl_session;
5733         struct nfs41_create_session_args args = {
5734                 .client = clp,
5735                 .cb_program = NFS4_CALLBACK,
5736         };
5737         struct nfs41_create_session_res res = {
5738                 .client = clp,
5739         };
5740         struct rpc_message msg = {
5741                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5742                 .rpc_argp = &args,
5743                 .rpc_resp = &res,
5744                 .rpc_cred = cred,
5745         };
5746         int status;
5747
5748         nfs4_init_channel_attrs(&args);
5749         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5750
5751         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5752
5753         if (!status)
5754                 /* Verify the session's negotiated channel_attrs values */
5755                 status = nfs4_verify_channel_attrs(&args, session);
5756         if (!status) {
5757                 /* Increment the clientid slot sequence id */
5758                 clp->cl_seqid++;
5759         }
5760
5761         return status;
5762 }
5763
5764 /*
5765  * Issues a CREATE_SESSION operation to the server.
5766  * It is the responsibility of the caller to verify the session is
5767  * expired before calling this routine.
5768  */
5769 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5770 {
5771         int status;
5772         unsigned *ptr;
5773         struct nfs4_session *session = clp->cl_session;
5774
5775         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5776
5777         status = _nfs4_proc_create_session(clp, cred);
5778         if (status)
5779                 goto out;
5780
5781         /* Init or reset the session slot tables */
5782         status = nfs4_setup_session_slot_tables(session);
5783         dprintk("slot table setup returned %d\n", status);
5784         if (status)
5785                 goto out;
5786
5787         ptr = (unsigned *)&session->sess_id.data[0];
5788         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5789                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5790 out:
5791         dprintk("<-- %s\n", __func__);
5792         return status;
5793 }
5794
5795 /*
5796  * Issue the over-the-wire RPC DESTROY_SESSION.
5797  * The caller must serialize access to this routine.
5798  */
5799 int nfs4_proc_destroy_session(struct nfs4_session *session,
5800                 struct rpc_cred *cred)
5801 {
5802         struct rpc_message msg = {
5803                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5804                 .rpc_argp = session,
5805                 .rpc_cred = cred,
5806         };
5807         int status = 0;
5808
5809         dprintk("--> nfs4_proc_destroy_session\n");
5810
5811         /* session is still being setup */
5812         if (session->clp->cl_cons_state != NFS_CS_READY)
5813                 return status;
5814
5815         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5816
5817         if (status)
5818                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5819                         "Session has been destroyed regardless...\n", status);
5820
5821         dprintk("<-- nfs4_proc_destroy_session\n");
5822         return status;
5823 }
5824
5825 /*
5826  * With sessions, the client is not marked ready until after a
5827  * successful EXCHANGE_ID and CREATE_SESSION.
5828  *
5829  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5830  * other versions of NFS can be tried.
5831  */
5832 static int nfs41_check_session_ready(struct nfs_client *clp)
5833 {
5834         int ret;
5835
5836         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
5837                 ret = nfs4_client_recover_expired_lease(clp);
5838                 if (ret)
5839                         return ret;
5840         }
5841         if (clp->cl_cons_state < NFS_CS_READY)
5842                 return -EPROTONOSUPPORT;
5843         smp_rmb();
5844         return 0;
5845 }
5846
5847 int nfs4_init_session(struct nfs_server *server)
5848 {
5849         struct nfs_client *clp = server->nfs_client;
5850         struct nfs4_session *session;
5851         unsigned int rsize, wsize;
5852
5853         if (!nfs4_has_session(clp))
5854                 return 0;
5855
5856         session = clp->cl_session;
5857         spin_lock(&clp->cl_lock);
5858         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5859
5860                 rsize = server->rsize;
5861                 if (rsize == 0)
5862                         rsize = NFS_MAX_FILE_IO_SIZE;
5863                 wsize = server->wsize;
5864                 if (wsize == 0)
5865                         wsize = NFS_MAX_FILE_IO_SIZE;
5866
5867                 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5868                 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5869         }
5870         spin_unlock(&clp->cl_lock);
5871
5872         return nfs41_check_session_ready(clp);
5873 }
5874
5875 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
5876 {
5877         struct nfs4_session *session = clp->cl_session;
5878         int ret;
5879
5880         spin_lock(&clp->cl_lock);
5881         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5882                 /*
5883                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
5884                  * DS lease to be equal to the MDS lease.
5885                  */
5886                 clp->cl_lease_time = lease_time;
5887                 clp->cl_last_renewal = jiffies;
5888         }
5889         spin_unlock(&clp->cl_lock);
5890
5891         ret = nfs41_check_session_ready(clp);
5892         if (ret)
5893                 return ret;
5894         /* Test for the DS role */
5895         if (!is_ds_client(clp))
5896                 return -ENODEV;
5897         return 0;
5898 }
5899 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5900
5901
5902 /*
5903  * Renew the cl_session lease.
5904  */
5905 struct nfs4_sequence_data {
5906         struct nfs_client *clp;
5907         struct nfs4_sequence_args args;
5908         struct nfs4_sequence_res res;
5909 };
5910
5911 static void nfs41_sequence_release(void *data)
5912 {
5913         struct nfs4_sequence_data *calldata = data;
5914         struct nfs_client *clp = calldata->clp;
5915
5916         if (atomic_read(&clp->cl_count) > 1)
5917                 nfs4_schedule_state_renewal(clp);
5918         nfs_put_client(clp);
5919         kfree(calldata);
5920 }
5921
5922 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5923 {
5924         switch(task->tk_status) {
5925         case -NFS4ERR_DELAY:
5926                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5927                 return -EAGAIN;
5928         default:
5929                 nfs4_schedule_lease_recovery(clp);
5930         }
5931         return 0;
5932 }
5933
5934 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5935 {
5936         struct nfs4_sequence_data *calldata = data;
5937         struct nfs_client *clp = calldata->clp;
5938
5939         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5940                 return;
5941
5942         if (task->tk_status < 0) {
5943                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5944                 if (atomic_read(&clp->cl_count) == 1)
5945                         goto out;
5946
5947                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5948                         rpc_restart_call_prepare(task);
5949                         return;
5950                 }
5951         }
5952         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5953 out:
5954         dprintk("<-- %s\n", __func__);
5955 }
5956
5957 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5958 {
5959         struct nfs4_sequence_data *calldata = data;
5960         struct nfs_client *clp = calldata->clp;
5961         struct nfs4_sequence_args *args;
5962         struct nfs4_sequence_res *res;
5963
5964         args = task->tk_msg.rpc_argp;
5965         res = task->tk_msg.rpc_resp;
5966
5967         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5968                 return;
5969         rpc_call_start(task);
5970 }
5971
5972 static const struct rpc_call_ops nfs41_sequence_ops = {
5973         .rpc_call_done = nfs41_sequence_call_done,
5974         .rpc_call_prepare = nfs41_sequence_prepare,
5975         .rpc_release = nfs41_sequence_release,
5976 };
5977
5978 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5979 {
5980         struct nfs4_sequence_data *calldata;
5981         struct rpc_message msg = {
5982                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5983                 .rpc_cred = cred,
5984         };
5985         struct rpc_task_setup task_setup_data = {
5986                 .rpc_client = clp->cl_rpcclient,
5987                 .rpc_message = &msg,
5988                 .callback_ops = &nfs41_sequence_ops,
5989                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5990         };
5991
5992         if (!atomic_inc_not_zero(&clp->cl_count))
5993                 return ERR_PTR(-EIO);
5994         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5995         if (calldata == NULL) {
5996                 nfs_put_client(clp);
5997                 return ERR_PTR(-ENOMEM);
5998         }
5999         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6000         msg.rpc_argp = &calldata->args;
6001         msg.rpc_resp = &calldata->res;
6002         calldata->clp = clp;
6003         task_setup_data.callback_data = calldata;
6004
6005         return rpc_run_task(&task_setup_data);
6006 }
6007
6008 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6009 {
6010         struct rpc_task *task;
6011         int ret = 0;
6012
6013         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6014                 return 0;
6015         task = _nfs41_proc_sequence(clp, cred);
6016         if (IS_ERR(task))
6017                 ret = PTR_ERR(task);
6018         else
6019                 rpc_put_task_async(task);
6020         dprintk("<-- %s status=%d\n", __func__, ret);
6021         return ret;
6022 }
6023
6024 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6025 {
6026         struct rpc_task *task;
6027         int ret;
6028
6029         task = _nfs41_proc_sequence(clp, cred);
6030         if (IS_ERR(task)) {
6031                 ret = PTR_ERR(task);
6032                 goto out;
6033         }
6034         ret = rpc_wait_for_completion_task(task);
6035         if (!ret) {
6036                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6037
6038                 if (task->tk_status == 0)
6039                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6040                 ret = task->tk_status;
6041         }
6042         rpc_put_task(task);
6043 out:
6044         dprintk("<-- %s status=%d\n", __func__, ret);
6045         return ret;
6046 }
6047
6048 struct nfs4_reclaim_complete_data {
6049         struct nfs_client *clp;
6050         struct nfs41_reclaim_complete_args arg;
6051         struct nfs41_reclaim_complete_res res;
6052 };
6053
6054 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6055 {
6056         struct nfs4_reclaim_complete_data *calldata = data;
6057
6058         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6059         if (nfs41_setup_sequence(calldata->clp->cl_session,
6060                                 &calldata->arg.seq_args,
6061                                 &calldata->res.seq_res, task))
6062                 return;
6063
6064         rpc_call_start(task);
6065 }
6066
6067 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6068 {
6069         switch(task->tk_status) {
6070         case 0:
6071         case -NFS4ERR_COMPLETE_ALREADY:
6072         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6073                 break;
6074         case -NFS4ERR_DELAY:
6075                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6076                 /* fall through */
6077         case -NFS4ERR_RETRY_UNCACHED_REP:
6078                 return -EAGAIN;
6079         default:
6080                 nfs4_schedule_lease_recovery(clp);
6081         }
6082         return 0;
6083 }
6084
6085 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6086 {
6087         struct nfs4_reclaim_complete_data *calldata = data;
6088         struct nfs_client *clp = calldata->clp;
6089         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6090
6091         dprintk("--> %s\n", __func__);
6092         if (!nfs41_sequence_done(task, res))
6093                 return;
6094
6095         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6096                 rpc_restart_call_prepare(task);
6097                 return;
6098         }
6099         dprintk("<-- %s\n", __func__);
6100 }
6101
6102 static void nfs4_free_reclaim_complete_data(void *data)
6103 {
6104         struct nfs4_reclaim_complete_data *calldata = data;
6105
6106         kfree(calldata);
6107 }
6108
6109 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6110         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6111         .rpc_call_done = nfs4_reclaim_complete_done,
6112         .rpc_release = nfs4_free_reclaim_complete_data,
6113 };
6114
6115 /*
6116  * Issue a global reclaim complete.
6117  */
6118 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6119 {
6120         struct nfs4_reclaim_complete_data *calldata;
6121         struct rpc_task *task;
6122         struct rpc_message msg = {
6123                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6124         };
6125         struct rpc_task_setup task_setup_data = {
6126                 .rpc_client = clp->cl_rpcclient,
6127                 .rpc_message = &msg,
6128                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6129                 .flags = RPC_TASK_ASYNC,
6130         };
6131         int status = -ENOMEM;
6132
6133         dprintk("--> %s\n", __func__);
6134         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6135         if (calldata == NULL)
6136                 goto out;
6137         calldata->clp = clp;
6138         calldata->arg.one_fs = 0;
6139
6140         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6141         msg.rpc_argp = &calldata->arg;
6142         msg.rpc_resp = &calldata->res;
6143         task_setup_data.callback_data = calldata;
6144         task = rpc_run_task(&task_setup_data);
6145         if (IS_ERR(task)) {
6146                 status = PTR_ERR(task);
6147                 goto out;
6148         }
6149         status = nfs4_wait_for_completion_rpc_task(task);
6150         if (status == 0)
6151                 status = task->tk_status;
6152         rpc_put_task(task);
6153         return 0;
6154 out:
6155         dprintk("<-- %s status=%d\n", __func__, status);
6156         return status;
6157 }
6158
6159 static void
6160 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6161 {
6162         struct nfs4_layoutget *lgp = calldata;
6163         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6164
6165         dprintk("--> %s\n", __func__);
6166         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6167          * right now covering the LAYOUTGET we are about to send.
6168          * However, that is not so catastrophic, and there seems
6169          * to be no way to prevent it completely.
6170          */
6171         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6172                                 &lgp->res.seq_res, task))
6173                 return;
6174         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6175                                           NFS_I(lgp->args.inode)->layout,
6176                                           lgp->args.ctx->state)) {
6177                 rpc_exit(task, NFS4_OK);
6178                 return;
6179         }
6180         rpc_call_start(task);
6181 }
6182
6183 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6184 {
6185         struct nfs4_layoutget *lgp = calldata;
6186         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6187
6188         dprintk("--> %s\n", __func__);
6189
6190         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6191                 return;
6192
6193         switch (task->tk_status) {
6194         case 0:
6195                 break;
6196         case -NFS4ERR_LAYOUTTRYLATER:
6197         case -NFS4ERR_RECALLCONFLICT:
6198                 task->tk_status = -NFS4ERR_DELAY;
6199                 /* Fall through */
6200         default:
6201                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6202                         rpc_restart_call_prepare(task);
6203                         return;
6204                 }
6205         }
6206         dprintk("<-- %s\n", __func__);
6207 }
6208
6209 static void nfs4_layoutget_release(void *calldata)
6210 {
6211         struct nfs4_layoutget *lgp = calldata;
6212
6213         dprintk("--> %s\n", __func__);
6214         put_nfs_open_context(lgp->args.ctx);
6215         kfree(calldata);
6216         dprintk("<-- %s\n", __func__);
6217 }
6218
6219 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6220         .rpc_call_prepare = nfs4_layoutget_prepare,
6221         .rpc_call_done = nfs4_layoutget_done,
6222         .rpc_release = nfs4_layoutget_release,
6223 };
6224
6225 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
6226 {
6227         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6228         struct rpc_task *task;
6229         struct rpc_message msg = {
6230                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6231                 .rpc_argp = &lgp->args,
6232                 .rpc_resp = &lgp->res,
6233         };
6234         struct rpc_task_setup task_setup_data = {
6235                 .rpc_client = server->client,
6236                 .rpc_message = &msg,
6237                 .callback_ops = &nfs4_layoutget_call_ops,
6238                 .callback_data = lgp,
6239                 .flags = RPC_TASK_ASYNC,
6240         };
6241         int status = 0;
6242
6243         dprintk("--> %s\n", __func__);
6244
6245         lgp->res.layoutp = &lgp->args.layout;
6246         lgp->res.seq_res.sr_slot = NULL;
6247         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6248         task = rpc_run_task(&task_setup_data);
6249         if (IS_ERR(task))
6250                 return PTR_ERR(task);
6251         status = nfs4_wait_for_completion_rpc_task(task);
6252         if (status == 0)
6253                 status = task->tk_status;
6254         if (status == 0)
6255                 status = pnfs_layout_process(lgp);
6256         rpc_put_task(task);
6257         dprintk("<-- %s status=%d\n", __func__, status);
6258         return status;
6259 }
6260
6261 static void
6262 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6263 {
6264         struct nfs4_layoutreturn *lrp = calldata;
6265
6266         dprintk("--> %s\n", __func__);
6267         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6268                                 &lrp->res.seq_res, task))
6269                 return;
6270         rpc_call_start(task);
6271 }
6272
6273 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6274 {
6275         struct nfs4_layoutreturn *lrp = calldata;
6276         struct nfs_server *server;
6277         struct pnfs_layout_hdr *lo = lrp->args.layout;
6278
6279         dprintk("--> %s\n", __func__);
6280
6281         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6282                 return;
6283
6284         server = NFS_SERVER(lrp->args.inode);
6285         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6286                 rpc_restart_call_prepare(task);
6287                 return;
6288         }
6289         spin_lock(&lo->plh_inode->i_lock);
6290         if (task->tk_status == 0) {
6291                 if (lrp->res.lrs_present) {
6292                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6293                 } else
6294                         BUG_ON(!list_empty(&lo->plh_segs));
6295         }
6296         lo->plh_block_lgets--;
6297         spin_unlock(&lo->plh_inode->i_lock);
6298         dprintk("<-- %s\n", __func__);
6299 }
6300
6301 static void nfs4_layoutreturn_release(void *calldata)
6302 {
6303         struct nfs4_layoutreturn *lrp = calldata;
6304
6305         dprintk("--> %s\n", __func__);
6306         put_layout_hdr(lrp->args.layout);
6307         kfree(calldata);
6308         dprintk("<-- %s\n", __func__);
6309 }
6310
6311 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6312         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6313         .rpc_call_done = nfs4_layoutreturn_done,
6314         .rpc_release = nfs4_layoutreturn_release,
6315 };
6316
6317 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6318 {
6319         struct rpc_task *task;
6320         struct rpc_message msg = {
6321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6322                 .rpc_argp = &lrp->args,
6323                 .rpc_resp = &lrp->res,
6324         };
6325         struct rpc_task_setup task_setup_data = {
6326                 .rpc_client = lrp->clp->cl_rpcclient,
6327                 .rpc_message = &msg,
6328                 .callback_ops = &nfs4_layoutreturn_call_ops,
6329                 .callback_data = lrp,
6330         };
6331         int status;
6332
6333         dprintk("--> %s\n", __func__);
6334         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6335         task = rpc_run_task(&task_setup_data);
6336         if (IS_ERR(task))
6337                 return PTR_ERR(task);
6338         status = task->tk_status;
6339         dprintk("<-- %s status=%d\n", __func__, status);
6340         rpc_put_task(task);
6341         return status;
6342 }
6343
6344 /*
6345  * Retrieve the list of Data Server devices from the MDS.
6346  */
6347 static int _nfs4_getdevicelist(struct nfs_server *server,
6348                                     const struct nfs_fh *fh,
6349                                     struct pnfs_devicelist *devlist)
6350 {
6351         struct nfs4_getdevicelist_args args = {
6352                 .fh = fh,
6353                 .layoutclass = server->pnfs_curr_ld->id,
6354         };
6355         struct nfs4_getdevicelist_res res = {
6356                 .devlist = devlist,
6357         };
6358         struct rpc_message msg = {
6359                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6360                 .rpc_argp = &args,
6361                 .rpc_resp = &res,
6362         };
6363         int status;
6364
6365         dprintk("--> %s\n", __func__);
6366         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6367                                 &res.seq_res, 0);
6368         dprintk("<-- %s status=%d\n", __func__, status);
6369         return status;
6370 }
6371
6372 int nfs4_proc_getdevicelist(struct nfs_server *server,
6373                             const struct nfs_fh *fh,
6374                             struct pnfs_devicelist *devlist)
6375 {
6376         struct nfs4_exception exception = { };
6377         int err;
6378
6379         do {
6380                 err = nfs4_handle_exception(server,
6381                                 _nfs4_getdevicelist(server, fh, devlist),
6382                                 &exception);
6383         } while (exception.retry);
6384
6385         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6386                 err, devlist->num_devs);
6387
6388         return err;
6389 }
6390 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6391
6392 static int
6393 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6394 {
6395         struct nfs4_getdeviceinfo_args args = {
6396                 .pdev = pdev,
6397         };
6398         struct nfs4_getdeviceinfo_res res = {
6399                 .pdev = pdev,
6400         };
6401         struct rpc_message msg = {
6402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6403                 .rpc_argp = &args,
6404                 .rpc_resp = &res,
6405         };
6406         int status;
6407
6408         dprintk("--> %s\n", __func__);
6409         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6410         dprintk("<-- %s status=%d\n", __func__, status);
6411
6412         return status;
6413 }
6414
6415 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6416 {
6417         struct nfs4_exception exception = { };
6418         int err;
6419
6420         do {
6421                 err = nfs4_handle_exception(server,
6422                                         _nfs4_proc_getdeviceinfo(server, pdev),
6423                                         &exception);
6424         } while (exception.retry);
6425         return err;
6426 }
6427 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6428
6429 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6430 {
6431         struct nfs4_layoutcommit_data *data = calldata;
6432         struct nfs_server *server = NFS_SERVER(data->args.inode);
6433
6434         if (nfs4_setup_sequence(server, &data->args.seq_args,
6435                                 &data->res.seq_res, task))
6436                 return;
6437         rpc_call_start(task);
6438 }
6439
6440 static void
6441 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6442 {
6443         struct nfs4_layoutcommit_data *data = calldata;
6444         struct nfs_server *server = NFS_SERVER(data->args.inode);
6445
6446         if (!nfs4_sequence_done(task, &data->res.seq_res))
6447                 return;
6448
6449         switch (task->tk_status) { /* Just ignore these failures */
6450         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6451         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6452         case -NFS4ERR_BADLAYOUT:     /* no layout */
6453         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6454                 task->tk_status = 0;
6455                 break;
6456         case 0:
6457                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6458                                                    data->res.fattr);
6459                 break;
6460         default:
6461                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6462                         rpc_restart_call_prepare(task);
6463                         return;
6464                 }
6465         }
6466 }
6467
6468 static void nfs4_layoutcommit_release(void *calldata)
6469 {
6470         struct nfs4_layoutcommit_data *data = calldata;
6471         struct pnfs_layout_segment *lseg, *tmp;
6472         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6473
6474         pnfs_cleanup_layoutcommit(data);
6475         /* Matched by references in pnfs_set_layoutcommit */
6476         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6477                 list_del_init(&lseg->pls_lc_list);
6478                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6479                                        &lseg->pls_flags))
6480                         put_lseg(lseg);
6481         }
6482
6483         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6484         smp_mb__after_clear_bit();
6485         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6486
6487         put_rpccred(data->cred);
6488         kfree(data);
6489 }
6490
6491 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6492         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6493         .rpc_call_done = nfs4_layoutcommit_done,
6494         .rpc_release = nfs4_layoutcommit_release,
6495 };
6496
6497 int
6498 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6499 {
6500         struct rpc_message msg = {
6501                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6502                 .rpc_argp = &data->args,
6503                 .rpc_resp = &data->res,
6504                 .rpc_cred = data->cred,
6505         };
6506         struct rpc_task_setup task_setup_data = {
6507                 .task = &data->task,
6508                 .rpc_client = NFS_CLIENT(data->args.inode),
6509                 .rpc_message = &msg,
6510                 .callback_ops = &nfs4_layoutcommit_ops,
6511                 .callback_data = data,
6512                 .flags = RPC_TASK_ASYNC,
6513         };
6514         struct rpc_task *task;
6515         int status = 0;
6516
6517         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6518                 "lbw: %llu inode %lu\n",
6519                 data->task.tk_pid, sync,
6520                 data->args.lastbytewritten,
6521                 data->args.inode->i_ino);
6522
6523         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6524         task = rpc_run_task(&task_setup_data);
6525         if (IS_ERR(task))
6526                 return PTR_ERR(task);
6527         if (sync == false)
6528                 goto out;
6529         status = nfs4_wait_for_completion_rpc_task(task);
6530         if (status != 0)
6531                 goto out;
6532         status = task->tk_status;
6533 out:
6534         dprintk("%s: status %d\n", __func__, status);
6535         rpc_put_task(task);
6536         return status;
6537 }
6538
6539 static int
6540 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6541                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6542 {
6543         struct nfs41_secinfo_no_name_args args = {
6544                 .style = SECINFO_STYLE_CURRENT_FH,
6545         };
6546         struct nfs4_secinfo_res res = {
6547                 .flavors = flavors,
6548         };
6549         struct rpc_message msg = {
6550                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6551                 .rpc_argp = &args,
6552                 .rpc_resp = &res,
6553         };
6554         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6555 }
6556
6557 static int
6558 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6559                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6560 {
6561         struct nfs4_exception exception = { };
6562         int err;
6563         do {
6564                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6565                 switch (err) {
6566                 case 0:
6567                 case -NFS4ERR_WRONGSEC:
6568                 case -NFS4ERR_NOTSUPP:
6569                         goto out;
6570                 default:
6571                         err = nfs4_handle_exception(server, err, &exception);
6572                 }
6573         } while (exception.retry);
6574 out:
6575         return err;
6576 }
6577
6578 static int
6579 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6580                     struct nfs_fsinfo *info)
6581 {
6582         int err;
6583         struct page *page;
6584         rpc_authflavor_t flavor;
6585         struct nfs4_secinfo_flavors *flavors;
6586
6587         page = alloc_page(GFP_KERNEL);
6588         if (!page) {
6589                 err = -ENOMEM;
6590                 goto out;
6591         }
6592
6593         flavors = page_address(page);
6594         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6595
6596         /*
6597          * Fall back on "guess and check" method if
6598          * the server doesn't support SECINFO_NO_NAME
6599          */
6600         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6601                 err = nfs4_find_root_sec(server, fhandle, info);
6602                 goto out_freepage;
6603         }
6604         if (err)
6605                 goto out_freepage;
6606
6607         flavor = nfs_find_best_sec(flavors);
6608         if (err == 0)
6609                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6610
6611 out_freepage:
6612         put_page(page);
6613         if (err == -EACCES)
6614                 return -EPERM;
6615 out:
6616         return err;
6617 }
6618
6619 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6620 {
6621         int status;
6622         struct nfs41_test_stateid_args args = {
6623                 .stateid = stateid,
6624         };
6625         struct nfs41_test_stateid_res res;
6626         struct rpc_message msg = {
6627                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6628                 .rpc_argp = &args,
6629                 .rpc_resp = &res,
6630         };
6631
6632         dprintk("NFS call  test_stateid %p\n", stateid);
6633         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6634         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6635         if (status != NFS_OK) {
6636                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6637                 return status;
6638         }
6639         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6640         return -res.status;
6641 }
6642
6643 /**
6644  * nfs41_test_stateid - perform a TEST_STATEID operation
6645  *
6646  * @server: server / transport on which to perform the operation
6647  * @stateid: state ID to test
6648  *
6649  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6650  * Otherwise a negative NFS4ERR value is returned if the operation
6651  * failed or the state ID is not currently valid.
6652  */
6653 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6654 {
6655         struct nfs4_exception exception = { };
6656         int err;
6657         do {
6658                 err = _nfs41_test_stateid(server, stateid);
6659                 if (err != -NFS4ERR_DELAY)
6660                         break;
6661                 nfs4_handle_exception(server, err, &exception);
6662         } while (exception.retry);
6663         return err;
6664 }
6665
6666 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6667 {
6668         struct nfs41_free_stateid_args args = {
6669                 .stateid = stateid,
6670         };
6671         struct nfs41_free_stateid_res res;
6672         struct rpc_message msg = {
6673                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6674                 .rpc_argp = &args,
6675                 .rpc_resp = &res,
6676         };
6677         int status;
6678
6679         dprintk("NFS call  free_stateid %p\n", stateid);
6680         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6681         status = nfs4_call_sync_sequence(server->client, server, &msg,
6682                                          &args.seq_args, &res.seq_res, 1);
6683         dprintk("NFS reply free_stateid: %d\n", status);
6684         return status;
6685 }
6686
6687 /**
6688  * nfs41_free_stateid - perform a FREE_STATEID operation
6689  *
6690  * @server: server / transport on which to perform the operation
6691  * @stateid: state ID to release
6692  *
6693  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6694  * negative NFS4ERR value is returned.
6695  */
6696 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6697 {
6698         struct nfs4_exception exception = { };
6699         int err;
6700         do {
6701                 err = _nfs4_free_stateid(server, stateid);
6702                 if (err != -NFS4ERR_DELAY)
6703                         break;
6704                 nfs4_handle_exception(server, err, &exception);
6705         } while (exception.retry);
6706         return err;
6707 }
6708
6709 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6710                 const nfs4_stateid *s2)
6711 {
6712         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6713                 return false;
6714
6715         if (s1->seqid == s2->seqid)
6716                 return true;
6717         if (s1->seqid == 0 || s2->seqid == 0)
6718                 return true;
6719
6720         return false;
6721 }
6722
6723 #endif /* CONFIG_NFS_V4_1 */
6724
6725 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6726                 const nfs4_stateid *s2)
6727 {
6728         return nfs4_stateid_match(s1, s2);
6729 }
6730
6731
6732 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6733         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6734         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6735         .recover_open   = nfs4_open_reclaim,
6736         .recover_lock   = nfs4_lock_reclaim,
6737         .establish_clid = nfs4_init_clientid,
6738         .get_clid_cred  = nfs4_get_setclientid_cred,
6739 };
6740
6741 #if defined(CONFIG_NFS_V4_1)
6742 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6743         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6744         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6745         .recover_open   = nfs4_open_reclaim,
6746         .recover_lock   = nfs4_lock_reclaim,
6747         .establish_clid = nfs41_init_clientid,
6748         .get_clid_cred  = nfs4_get_exchange_id_cred,
6749         .reclaim_complete = nfs41_proc_reclaim_complete,
6750 };
6751 #endif /* CONFIG_NFS_V4_1 */
6752
6753 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6754         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6755         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6756         .recover_open   = nfs4_open_expired,
6757         .recover_lock   = nfs4_lock_expired,
6758         .establish_clid = nfs4_init_clientid,
6759         .get_clid_cred  = nfs4_get_setclientid_cred,
6760 };
6761
6762 #if defined(CONFIG_NFS_V4_1)
6763 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6764         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6765         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6766         .recover_open   = nfs41_open_expired,
6767         .recover_lock   = nfs41_lock_expired,
6768         .establish_clid = nfs41_init_clientid,
6769         .get_clid_cred  = nfs4_get_exchange_id_cred,
6770 };
6771 #endif /* CONFIG_NFS_V4_1 */
6772
6773 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6774         .sched_state_renewal = nfs4_proc_async_renew,
6775         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6776         .renew_lease = nfs4_proc_renew,
6777 };
6778
6779 #if defined(CONFIG_NFS_V4_1)
6780 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6781         .sched_state_renewal = nfs41_proc_async_sequence,
6782         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6783         .renew_lease = nfs4_proc_sequence,
6784 };
6785 #endif
6786
6787 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6788         .minor_version = 0,
6789         .call_sync = _nfs4_call_sync,
6790         .match_stateid = nfs4_match_stateid,
6791         .find_root_sec = nfs4_find_root_sec,
6792         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6793         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6794         .state_renewal_ops = &nfs40_state_renewal_ops,
6795 };
6796
6797 #if defined(CONFIG_NFS_V4_1)
6798 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6799         .minor_version = 1,
6800         .call_sync = _nfs4_call_sync_session,
6801         .match_stateid = nfs41_match_stateid,
6802         .find_root_sec = nfs41_find_root_sec,
6803         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6804         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6805         .state_renewal_ops = &nfs41_state_renewal_ops,
6806 };
6807 #endif
6808
6809 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6810         [0] = &nfs_v4_0_minor_ops,
6811 #if defined(CONFIG_NFS_V4_1)
6812         [1] = &nfs_v4_1_minor_ops,
6813 #endif
6814 };
6815
6816 static const struct inode_operations nfs4_file_inode_operations = {
6817         .permission     = nfs_permission,
6818         .getattr        = nfs_getattr,
6819         .setattr        = nfs_setattr,
6820         .getxattr       = generic_getxattr,
6821         .setxattr       = generic_setxattr,
6822         .listxattr      = generic_listxattr,
6823         .removexattr    = generic_removexattr,
6824 };
6825
6826 const struct nfs_rpc_ops nfs_v4_clientops = {
6827         .version        = 4,                    /* protocol version */
6828         .dentry_ops     = &nfs4_dentry_operations,
6829         .dir_inode_ops  = &nfs4_dir_inode_operations,
6830         .file_inode_ops = &nfs4_file_inode_operations,
6831         .file_ops       = &nfs4_file_operations,
6832         .getroot        = nfs4_proc_get_root,
6833         .submount       = nfs4_submount,
6834         .getattr        = nfs4_proc_getattr,
6835         .setattr        = nfs4_proc_setattr,
6836         .lookup         = nfs4_proc_lookup,
6837         .access         = nfs4_proc_access,
6838         .readlink       = nfs4_proc_readlink,
6839         .create         = nfs4_proc_create,
6840         .remove         = nfs4_proc_remove,
6841         .unlink_setup   = nfs4_proc_unlink_setup,
6842         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6843         .unlink_done    = nfs4_proc_unlink_done,
6844         .rename         = nfs4_proc_rename,
6845         .rename_setup   = nfs4_proc_rename_setup,
6846         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6847         .rename_done    = nfs4_proc_rename_done,
6848         .link           = nfs4_proc_link,
6849         .symlink        = nfs4_proc_symlink,
6850         .mkdir          = nfs4_proc_mkdir,
6851         .rmdir          = nfs4_proc_remove,
6852         .readdir        = nfs4_proc_readdir,
6853         .mknod          = nfs4_proc_mknod,
6854         .statfs         = nfs4_proc_statfs,
6855         .fsinfo         = nfs4_proc_fsinfo,
6856         .pathconf       = nfs4_proc_pathconf,
6857         .set_capabilities = nfs4_server_capabilities,
6858         .decode_dirent  = nfs4_decode_dirent,
6859         .read_setup     = nfs4_proc_read_setup,
6860         .read_pageio_init = pnfs_pageio_init_read,
6861         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6862         .read_done      = nfs4_read_done,
6863         .write_setup    = nfs4_proc_write_setup,
6864         .write_pageio_init = pnfs_pageio_init_write,
6865         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6866         .write_done     = nfs4_write_done,
6867         .commit_setup   = nfs4_proc_commit_setup,
6868         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6869         .commit_done    = nfs4_commit_done,
6870         .lock           = nfs4_proc_lock,
6871         .clear_acl_cache = nfs4_zap_acl_attr,
6872         .close_context  = nfs4_close_context,
6873         .open_context   = nfs4_atomic_open,
6874         .have_delegation = nfs4_have_delegation,
6875         .return_delegation = nfs4_inode_return_delegation,
6876         .alloc_client   = nfs4_alloc_client,
6877         .init_client    = nfs4_init_client,
6878         .free_client    = nfs4_free_client,
6879 };
6880
6881 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6882         .prefix = XATTR_NAME_NFSV4_ACL,
6883         .list   = nfs4_xattr_list_nfs4_acl,
6884         .get    = nfs4_xattr_get_nfs4_acl,
6885         .set    = nfs4_xattr_set_nfs4_acl,
6886 };
6887
6888 const struct xattr_handler *nfs4_xattr_handlers[] = {
6889         &nfs4_xattr_nfs4_acl_handler,
6890         NULL
6891 };
6892
6893 module_param(max_session_slots, ushort, 0644);
6894 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6895                 "requests the client will negotiate");
6896
6897 /*
6898  * Local variables:
6899  *  c-basic-offset: 8
6900  * End:
6901  */