fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/nfs_idmap.h>
  56 #include <linux/sunrpc/bc_xprt.h>
  57 #include <linux/xattr.h>
  58 #include <linux/utsname.h>
  59 #include <linux/freezer.h>
  60
  61 #include "nfs4_fs.h"
  62 #include "delegation.h"
  63 #include "internal.h"
  64 #include "iostat.h"
  65 #include "callback.h"
  66 #include "pnfs.h"
  67 #include "netns.h"
  68
  69 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  75
  76 static unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
  77
  78 struct nfs4_opendata;
  79 static int _nfs4_proc_open(struct nfs4_opendata *data);
  80 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  81 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  82 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  83 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  84 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  85 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  86 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  87                             struct nfs_fattr *fattr, struct iattr *sattr,
  88                             struct nfs4_state *state);
  89 #ifdef CONFIG_NFS_V4_1
  90 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  92 #endif
  93 /* Prevent leaks of NFSv4 errors into userland */
  94 static int nfs4_map_errors(int err)
  95 {
  96         if (err >= -1000)
  97                 return err;
  98         switch (err) {
  99         case -NFS4ERR_RESOURCE:
 100                 return -EREMOTEIO;
 101         case -NFS4ERR_WRONGSEC:
 102                 return -EPERM;
 103         case -NFS4ERR_BADOWNER:
 104         case -NFS4ERR_BADNAME:
 105                 return -EINVAL;
 106         case -NFS4ERR_SHARE_DENIED:
 107                 return -EACCES;
 108         case -NFS4ERR_MINOR_VERS_MISMATCH:
 109                 return -EPROTONOSUPPORT;
 110         default:
 111                 dprintk("%s could not handle NFSv4 error %d\n",
 112                                 __func__, -err);
 113                 break;
 114         }
 115         return -EIO;
 116 }
 117
 118 /*
 119  * This is our standard bitmap for GETATTR requests.
 120  */
 121 const u32 nfs4_fattr_bitmap[3] = {
 122         FATTR4_WORD0_TYPE
 123         | FATTR4_WORD0_CHANGE
 124         | FATTR4_WORD0_SIZE
 125         | FATTR4_WORD0_FSID
 126         | FATTR4_WORD0_FILEID,
 127         FATTR4_WORD1_MODE
 128         | FATTR4_WORD1_NUMLINKS
 129         | FATTR4_WORD1_OWNER
 130         | FATTR4_WORD1_OWNER_GROUP
 131         | FATTR4_WORD1_RAWDEV
 132         | FATTR4_WORD1_SPACE_USED
 133         | FATTR4_WORD1_TIME_ACCESS
 134         | FATTR4_WORD1_TIME_METADATA
 135         | FATTR4_WORD1_TIME_MODIFY
 136 };
 137
 138 static const u32 nfs4_pnfs_open_bitmap[3] = {
 139         FATTR4_WORD0_TYPE
 140         | FATTR4_WORD0_CHANGE
 141         | FATTR4_WORD0_SIZE
 142         | FATTR4_WORD0_FSID
 143         | FATTR4_WORD0_FILEID,
 144         FATTR4_WORD1_MODE
 145         | FATTR4_WORD1_NUMLINKS
 146         | FATTR4_WORD1_OWNER
 147         | FATTR4_WORD1_OWNER_GROUP
 148         | FATTR4_WORD1_RAWDEV
 149         | FATTR4_WORD1_SPACE_USED
 150         | FATTR4_WORD1_TIME_ACCESS
 151         | FATTR4_WORD1_TIME_METADATA
 152         | FATTR4_WORD1_TIME_MODIFY,
 153         FATTR4_WORD2_MDSTHRESHOLD
 154 };
 155
 156 const u32 nfs4_statfs_bitmap[2] = {
 157         FATTR4_WORD0_FILES_AVAIL
 158         | FATTR4_WORD0_FILES_FREE
 159         | FATTR4_WORD0_FILES_TOTAL,
 160         FATTR4_WORD1_SPACE_AVAIL
 161         | FATTR4_WORD1_SPACE_FREE
 162         | FATTR4_WORD1_SPACE_TOTAL
 163 };
 164
 165 const u32 nfs4_pathconf_bitmap[2] = {
 166         FATTR4_WORD0_MAXLINK
 167         | FATTR4_WORD0_MAXNAME,
 168         0
 169 };
 170
 171 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 172                         | FATTR4_WORD0_MAXREAD
 173                         | FATTR4_WORD0_MAXWRITE
 174                         | FATTR4_WORD0_LEASE_TIME,
 175                         FATTR4_WORD1_TIME_DELTA
 176                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 177                         FATTR4_WORD2_LAYOUT_BLKSIZE
 178 };
 179
 180 const u32 nfs4_fs_locations_bitmap[2] = {
 181         FATTR4_WORD0_TYPE
 182         | FATTR4_WORD0_CHANGE
 183         | FATTR4_WORD0_SIZE
 184         | FATTR4_WORD0_FSID
 185         | FATTR4_WORD0_FILEID
 186         | FATTR4_WORD0_FS_LOCATIONS,
 187         FATTR4_WORD1_MODE
 188         | FATTR4_WORD1_NUMLINKS
 189         | FATTR4_WORD1_OWNER
 190         | FATTR4_WORD1_OWNER_GROUP
 191         | FATTR4_WORD1_RAWDEV
 192         | FATTR4_WORD1_SPACE_USED
 193         | FATTR4_WORD1_TIME_ACCESS
 194         | FATTR4_WORD1_TIME_METADATA
 195         | FATTR4_WORD1_TIME_MODIFY
 196         | FATTR4_WORD1_MOUNTED_ON_FILEID
 197 };
 198
 199 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 200                 struct nfs4_readdir_arg *readdir)
 201 {
 202         __be32 *start, *p;
 203
 204         BUG_ON(readdir->count < 80);
 205         if (cookie > 2) {
 206                 readdir->cookie = cookie;
 207                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 208                 return;
 209         }
 210
 211         readdir->cookie = 0;
 212         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 213         if (cookie == 2)
 214                 return;
 215
 216         /*
 217          * NFSv4 servers do not return entries for '.' and '..'
 218          * Therefore, we fake these entries here.  We let '.'
 219          * have cookie 0 and '..' have cookie 1.  Note that
 220          * when talking to the server, we always send cookie 0
 221          * instead of 1 or 2.
 222          */
 223         start = p = kmap_atomic(*readdir->pages);
 224
 225         if (cookie == 0) {
 226                 *p++ = xdr_one;                                  /* next */
 227                 *p++ = xdr_zero;                   /* cookie, first word */
 228                 *p++ = xdr_one;                   /* cookie, second word */
 229                 *p++ = xdr_one;                             /* entry len */
 230                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 231                 p++;
 232                 *p++ = xdr_one;                         /* bitmap length */
 233                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 234                 *p++ = htonl(8);              /* attribute buffer length */
 235                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 236         }
 237
 238         *p++ = xdr_one;                                  /* next */
 239         *p++ = xdr_zero;                   /* cookie, first word */
 240         *p++ = xdr_two;                   /* cookie, second word */
 241         *p++ = xdr_two;                             /* entry len */
 242         memcpy(p, "..\0\0", 4);                         /* entry */
 243         p++;
 244         *p++ = xdr_one;                         /* bitmap length */
 245         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 246         *p++ = htonl(8);              /* attribute buffer length */
 247         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 248
 249         readdir->pgbase = (char *)p - (char *)start;
 250         readdir->count -= readdir->pgbase;
 251         kunmap_atomic(start);
 252 }
 253
 254 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 255 {
 256         int res;
 257
 258         might_sleep();
 259
 260         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 261                         nfs_wait_bit_killable, TASK_KILLABLE);
 262         return res;
 263 }
 264
 265 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 266 {
 267         int res = 0;
 268
 269         might_sleep();
 270
 271         if (*timeout <= 0)
 272                 *timeout = NFS4_POLL_RETRY_MIN;
 273         if (*timeout > NFS4_POLL_RETRY_MAX)
 274                 *timeout = NFS4_POLL_RETRY_MAX;
 275         freezable_schedule_timeout_killable(*timeout);
 276         if (fatal_signal_pending(current))
 277                 res = -ERESTARTSYS;
 278         *timeout <<= 1;
 279         return res;
 280 }
 281
 282 /* This is the error handling routine for processes that are allowed
 283  * to sleep.
 284  */
 285 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 286 {
 287         struct nfs_client *clp = server->nfs_client;
 288         struct nfs4_state *state = exception->state;
 289         struct inode *inode = exception->inode;
 290         int ret = errorcode;
 291
 292         exception->retry = 0;
 293         switch(errorcode) {
 294                 case 0:
 295                         return 0;
 296                 case -NFS4ERR_OPENMODE:
 297                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 298                                 nfs4_inode_return_delegation(inode);
 299                                 exception->retry = 1;
 300                                 return 0;
 301                         }
 302                         if (state == NULL)
 303                                 break;
 304                         nfs4_schedule_stateid_recovery(server, state);
 305                         goto wait_on_recovery;
 306                 case -NFS4ERR_DELEG_REVOKED:
 307                 case -NFS4ERR_ADMIN_REVOKED:
 308                 case -NFS4ERR_BAD_STATEID:
 309                         if (state == NULL)
 310                                 break;
 311                         nfs_remove_bad_delegation(state->inode);
 312                         nfs4_schedule_stateid_recovery(server, state);
 313                         goto wait_on_recovery;
 314                 case -NFS4ERR_EXPIRED:
 315                         if (state != NULL)
 316                                 nfs4_schedule_stateid_recovery(server, state);
 317                 case -NFS4ERR_STALE_STATEID:
 318                 case -NFS4ERR_STALE_CLIENTID:
 319                         nfs4_schedule_lease_recovery(clp);
 320                         goto wait_on_recovery;
 321 #if defined(CONFIG_NFS_V4_1)
 322                 case -NFS4ERR_BADSESSION:
 323                 case -NFS4ERR_BADSLOT:
 324                 case -NFS4ERR_BAD_HIGH_SLOT:
 325                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 326                 case -NFS4ERR_DEADSESSION:
 327                 case -NFS4ERR_SEQ_FALSE_RETRY:
 328                 case -NFS4ERR_SEQ_MISORDERED:
 329                         dprintk("%s ERROR: %d Reset session\n", __func__,
 330                                 errorcode);
 331                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 332                         exception->retry = 1;
 333                         break;
 334 #endif /* defined(CONFIG_NFS_V4_1) */
 335                 case -NFS4ERR_FILE_OPEN:
 336                         if (exception->timeout > HZ) {
 337                                 /* We have retried a decent amount, time to
 338                                  * fail
 339                                  */
 340                                 ret = -EBUSY;
 341                                 break;
 342                         }
 343                 case -NFS4ERR_GRACE:
 344                 case -NFS4ERR_DELAY:
 345                 case -EKEYEXPIRED:
 346                         ret = nfs4_delay(server->client, &exception->timeout);
 347                         if (ret != 0)
 348                                 break;
 349                 case -NFS4ERR_RETRY_UNCACHED_REP:
 350                 case -NFS4ERR_OLD_STATEID:
 351                         exception->retry = 1;
 352                         break;
 353                 case -NFS4ERR_BADOWNER:
 354                         /* The following works around a Linux server bug! */
 355                 case -NFS4ERR_BADNAME:
 356                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 357                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 358                                 exception->retry = 1;
 359                                 printk(KERN_WARNING "NFS: v4 server %s "
 360                                                 "does not accept raw "
 361                                                 "uid/gids. "
 362                                                 "Reenabling the idmapper.\n",
 363                                                 server->nfs_client->cl_hostname);
 364                         }
 365         }
 366         /* We failed to handle the error */
 367         return nfs4_map_errors(ret);
 368 wait_on_recovery:
 369         ret = nfs4_wait_clnt_recover(clp);
 370         if (ret == 0)
 371                 exception->retry = 1;
 372         return ret;
 373 }
 374
 375
 376 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 377 {
 378         spin_lock(&clp->cl_lock);
 379         if (time_before(clp->cl_last_renewal,timestamp))
 380                 clp->cl_last_renewal = timestamp;
 381         spin_unlock(&clp->cl_lock);
 382 }
 383
 384 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 385 {
 386         do_renew_lease(server->nfs_client, timestamp);
 387 }
 388
 389 #if defined(CONFIG_NFS_V4_1)
 390
 391 /*
 392  * nfs4_free_slot - free a slot and efficiently update slot table.
 393  *
 394  * freeing a slot is trivially done by clearing its respective bit
 395  * in the bitmap.
 396  * If the freed slotid equals highest_used_slotid we want to update it
 397  * so that the server would be able to size down the slot table if needed,
 398  * otherwise we know that the highest_used_slotid is still in use.
 399  * When updating highest_used_slotid there may be "holes" in the bitmap
 400  * so we need to scan down from highest_used_slotid to 0 looking for the now
 401  * highest slotid in use.
 402  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 403  *
 404  * Must be called while holding tbl->slot_tbl_lock
 405  */
 406 static void
 407 nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
 408 {
 409         BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
 410         /* clear used bit in bitmap */
 411         __clear_bit(slotid, tbl->used_slots);
 412
 413         /* update highest_used_slotid when it is freed */
 414         if (slotid == tbl->highest_used_slotid) {
 415                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 416                 if (slotid < tbl->max_slots)
 417                         tbl->highest_used_slotid = slotid;
 418                 else
 419                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 420         }
 421         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 422                 slotid, tbl->highest_used_slotid);
 423 }
 424
 425 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 426 {
 427         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 428         return true;
 429 }
 430
 431 /*
 432  * Signal state manager thread if session fore channel is drained
 433  */
 434 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 435 {
 436         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 437                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 438                                 nfs4_set_task_privileged, NULL);
 439                 return;
 440         }
 441
 442         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 443                 return;
 444
 445         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 446         complete(&ses->fc_slot_table.complete);
 447 }
 448
 449 /*
 450  * Signal state manager thread if session back channel is drained
 451  */
 452 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 453 {
 454         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 455             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 456                 return;
 457         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 458         complete(&ses->bc_slot_table.complete);
 459 }
 460
 461 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 462 {
 463         struct nfs4_slot_table *tbl;
 464
 465         tbl = &res->sr_session->fc_slot_table;
 466         if (!res->sr_slot) {
 467                 /* just wake up the next guy waiting since
 468                  * we may have not consumed a slot after all */
 469                 dprintk("%s: No slot\n", __func__);
 470                 return;
 471         }
 472
 473         spin_lock(&tbl->slot_tbl_lock);
 474         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 475         nfs4_check_drain_fc_complete(res->sr_session);
 476         spin_unlock(&tbl->slot_tbl_lock);
 477         res->sr_slot = NULL;
 478 }
 479
 480 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 481 {
 482         unsigned long timestamp;
 483         struct nfs_client *clp;
 484
 485         /*
 486          * sr_status remains 1 if an RPC level error occurred. The server
 487          * may or may not have processed the sequence operation..
 488          * Proceed as if the server received and processed the sequence
 489          * operation.
 490          */
 491         if (res->sr_status == 1)
 492                 res->sr_status = NFS_OK;
 493
 494         /* don't increment the sequence number if the task wasn't sent */
 495         if (!RPC_WAS_SENT(task))
 496                 goto out;
 497
 498         /* Check the SEQUENCE operation status */
 499         switch (res->sr_status) {
 500         case 0:
 501                 /* Update the slot's sequence and clientid lease timer */
 502                 ++res->sr_slot->seq_nr;
 503                 timestamp = res->sr_renewal_time;
 504                 clp = res->sr_session->clp;
 505                 do_renew_lease(clp, timestamp);
 506                 /* Check sequence flags */
 507                 if (res->sr_status_flags != 0)
 508                         nfs4_schedule_lease_recovery(clp);
 509                 break;
 510         case -NFS4ERR_DELAY:
 511                 /* The server detected a resend of the RPC call and
 512                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 513                  * of RFC5661.
 514                  */
 515                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 516                         __func__,
 517                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 518                         res->sr_slot->seq_nr);
 519                 goto out_retry;
 520         default:
 521                 /* Just update the slot sequence no. */
 522                 ++res->sr_slot->seq_nr;
 523         }
 524 out:
 525         /* The session may be reset by one of the error handlers. */
 526         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 527         nfs41_sequence_free_slot(res);
 528         return 1;
 529 out_retry:
 530         if (!rpc_restart_call(task))
 531                 goto out;
 532         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 533         return 0;
 534 }
 535
 536 static int nfs4_sequence_done(struct rpc_task *task,
 537                                struct nfs4_sequence_res *res)
 538 {
 539         if (res->sr_session == NULL)
 540                 return 1;
 541         return nfs41_sequence_done(task, res);
 542 }
 543
 544 /*
 545  * nfs4_find_slot - efficiently look for a free slot
 546  *
 547  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 548  * If found, we mark the slot as used, update the highest_used_slotid,
 549  * and respectively set up the sequence operation args.
 550  * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
 551  *
 552  * Note: must be called with under the slot_tbl_lock.
 553  */
 554 static u32
 555 nfs4_find_slot(struct nfs4_slot_table *tbl)
 556 {
 557         u32 slotid;
 558         u32 ret_id = NFS4_NO_SLOT;
 559
 560         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 561                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 562                 tbl->max_slots);
 563         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 564         if (slotid >= tbl->max_slots)
 565                 goto out;
 566         __set_bit(slotid, tbl->used_slots);
 567         if (slotid > tbl->highest_used_slotid ||
 568                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 569                 tbl->highest_used_slotid = slotid;
 570         ret_id = slotid;
 571 out:
 572         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 573                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 574         return ret_id;
 575 }
 576
 577 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 578                 struct nfs4_sequence_res *res, int cache_reply)
 579 {
 580         args->sa_session = NULL;
 581         args->sa_cache_this = 0;
 582         if (cache_reply)
 583                 args->sa_cache_this = 1;
 584         res->sr_session = NULL;
 585         res->sr_slot = NULL;
 586 }
 587
 588 int nfs41_setup_sequence(struct nfs4_session *session,
 589                                 struct nfs4_sequence_args *args,
 590                                 struct nfs4_sequence_res *res,
 591                                 struct rpc_task *task)
 592 {
 593         struct nfs4_slot *slot;
 594         struct nfs4_slot_table *tbl;
 595         u32 slotid;
 596
 597         dprintk("--> %s\n", __func__);
 598         /* slot already allocated? */
 599         if (res->sr_slot != NULL)
 600                 return 0;
 601
 602         tbl = &session->fc_slot_table;
 603
 604         spin_lock(&tbl->slot_tbl_lock);
 605         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 606             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 607                 /* The state manager will wait until the slot table is empty */
 608                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 609                 spin_unlock(&tbl->slot_tbl_lock);
 610                 dprintk("%s session is draining\n", __func__);
 611                 return -EAGAIN;
 612         }
 613
 614         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 615             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 616                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 617                 spin_unlock(&tbl->slot_tbl_lock);
 618                 dprintk("%s enforce FIFO order\n", __func__);
 619                 return -EAGAIN;
 620         }
 621
 622         slotid = nfs4_find_slot(tbl);
 623         if (slotid == NFS4_NO_SLOT) {
 624                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 625                 spin_unlock(&tbl->slot_tbl_lock);
 626                 dprintk("<-- %s: no free slots\n", __func__);
 627                 return -EAGAIN;
 628         }
 629         spin_unlock(&tbl->slot_tbl_lock);
 630
 631         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 632         slot = tbl->slots + slotid;
 633         args->sa_session = session;
 634         args->sa_slotid = slotid;
 635
 636         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 637
 638         res->sr_session = session;
 639         res->sr_slot = slot;
 640         res->sr_renewal_time = jiffies;
 641         res->sr_status_flags = 0;
 642         /*
 643          * sr_status is only set in decode_sequence, and so will remain
 644          * set to 1 if an rpc level failure occurs.
 645          */
 646         res->sr_status = 1;
 647         return 0;
 648 }
 649 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 650
 651 int nfs4_setup_sequence(const struct nfs_server *server,
 652                         struct nfs4_sequence_args *args,
 653                         struct nfs4_sequence_res *res,
 654                         struct rpc_task *task)
 655 {
 656         struct nfs4_session *session = nfs4_get_session(server);
 657         int ret = 0;
 658
 659         if (session == NULL)
 660                 goto out;
 661
 662         dprintk("--> %s clp %p session %p sr_slot %td\n",
 663                 __func__, session->clp, session, res->sr_slot ?
 664                         res->sr_slot - session->fc_slot_table.slots : -1);
 665
 666         ret = nfs41_setup_sequence(session, args, res, task);
 667 out:
 668         dprintk("<-- %s status=%d\n", __func__, ret);
 669         return ret;
 670 }
 671
 672 struct nfs41_call_sync_data {
 673         const struct nfs_server *seq_server;
 674         struct nfs4_sequence_args *seq_args;
 675         struct nfs4_sequence_res *seq_res;
 676 };
 677
 678 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 679 {
 680         struct nfs41_call_sync_data *data = calldata;
 681
 682         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 683
 684         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 685                                 data->seq_res, task))
 686                 return;
 687         rpc_call_start(task);
 688 }
 689
 690 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 691 {
 692         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 693         nfs41_call_sync_prepare(task, calldata);
 694 }
 695
 696 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 697 {
 698         struct nfs41_call_sync_data *data = calldata;
 699
 700         nfs41_sequence_done(task, data->seq_res);
 701 }
 702
 703 static const struct rpc_call_ops nfs41_call_sync_ops = {
 704         .rpc_call_prepare = nfs41_call_sync_prepare,
 705         .rpc_call_done = nfs41_call_sync_done,
 706 };
 707
 708 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 709         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 710         .rpc_call_done = nfs41_call_sync_done,
 711 };
 712
 713 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 714                                    struct nfs_server *server,
 715                                    struct rpc_message *msg,
 716                                    struct nfs4_sequence_args *args,
 717                                    struct nfs4_sequence_res *res,
 718                                    int privileged)
 719 {
 720         int ret;
 721         struct rpc_task *task;
 722         struct nfs41_call_sync_data data = {
 723                 .seq_server = server,
 724                 .seq_args = args,
 725                 .seq_res = res,
 726         };
 727         struct rpc_task_setup task_setup = {
 728                 .rpc_client = clnt,
 729                 .rpc_message = msg,
 730                 .callback_ops = &nfs41_call_sync_ops,
 731                 .callback_data = &data
 732         };
 733
 734         if (privileged)
 735                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 736         task = rpc_run_task(&task_setup);
 737         if (IS_ERR(task))
 738                 ret = PTR_ERR(task);
 739         else {
 740                 ret = task->tk_status;
 741                 rpc_put_task(task);
 742         }
 743         return ret;
 744 }
 745
 746 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 747                             struct nfs_server *server,
 748                             struct rpc_message *msg,
 749                             struct nfs4_sequence_args *args,
 750                             struct nfs4_sequence_res *res,
 751                             int cache_reply)
 752 {
 753         nfs41_init_sequence(args, res, cache_reply);
 754         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 755 }
 756
 757 #else
 758 static inline
 759 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 760                 struct nfs4_sequence_res *res, int cache_reply)
 761 {
 762 }
 763
 764 static int nfs4_sequence_done(struct rpc_task *task,
 765                                struct nfs4_sequence_res *res)
 766 {
 767         return 1;
 768 }
 769 #endif /* CONFIG_NFS_V4_1 */
 770
 771 int _nfs4_call_sync(struct rpc_clnt *clnt,
 772                     struct nfs_server *server,
 773                     struct rpc_message *msg,
 774                     struct nfs4_sequence_args *args,
 775                     struct nfs4_sequence_res *res,
 776                     int cache_reply)
 777 {
 778         nfs41_init_sequence(args, res, cache_reply);
 779         return rpc_call_sync(clnt, msg, 0);
 780 }
 781
 782 static inline
 783 int nfs4_call_sync(struct rpc_clnt *clnt,
 784                    struct nfs_server *server,
 785                    struct rpc_message *msg,
 786                    struct nfs4_sequence_args *args,
 787                    struct nfs4_sequence_res *res,
 788                    int cache_reply)
 789 {
 790         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 791                                                 args, res, cache_reply);
 792 }
 793
 794 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 795 {
 796         struct nfs_inode *nfsi = NFS_I(dir);
 797
 798         spin_lock(&dir->i_lock);
 799         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 800         if (!cinfo->atomic || cinfo->before != dir->i_version)
 801                 nfs_force_lookup_revalidate(dir);
 802         dir->i_version = cinfo->after;
 803         spin_unlock(&dir->i_lock);
 804 }
 805
 806 struct nfs4_opendata {
 807         struct kref kref;
 808         struct nfs_openargs o_arg;
 809         struct nfs_openres o_res;
 810         struct nfs_open_confirmargs c_arg;
 811         struct nfs_open_confirmres c_res;
 812         struct nfs4_string owner_name;
 813         struct nfs4_string group_name;
 814         struct nfs_fattr f_attr;
 815         struct dentry *dir;
 816         struct dentry *dentry;
 817         struct nfs4_state_owner *owner;
 818         struct nfs4_state *state;
 819         struct iattr attrs;
 820         unsigned long timestamp;
 821         unsigned int rpc_done : 1;
 822         int rpc_status;
 823         int cancelled;
 824 };
 825
 826
 827 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 828 {
 829         p->o_res.f_attr = &p->f_attr;
 830         p->o_res.seqid = p->o_arg.seqid;
 831         p->c_res.seqid = p->c_arg.seqid;
 832         p->o_res.server = p->o_arg.server;
 833         nfs_fattr_init(&p->f_attr);
 834         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 835 }
 836
 837 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 838                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 839                 const struct iattr *attrs,
 840                 gfp_t gfp_mask)
 841 {
 842         struct dentry *parent = dget_parent(dentry);
 843         struct inode *dir = parent->d_inode;
 844         struct nfs_server *server = NFS_SERVER(dir);
 845         struct nfs4_opendata *p;
 846
 847         p = kzalloc(sizeof(*p), gfp_mask);
 848         if (p == NULL)
 849                 goto err;
 850         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 851         if (p->o_arg.seqid == NULL)
 852                 goto err_free;
 853         nfs_sb_active(dentry->d_sb);
 854         p->dentry = dget(dentry);
 855         p->dir = parent;
 856         p->owner = sp;
 857         atomic_inc(&sp->so_count);
 858         p->o_arg.fh = NFS_FH(dir);
 859         p->o_arg.open_flags = flags;
 860         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 861         p->o_arg.clientid = server->nfs_client->cl_clientid;
 862         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 863         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 864         p->o_arg.name = &dentry->d_name;
 865         p->o_arg.server = server;
 866         p->o_arg.bitmask = server->attr_bitmask;
 867         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 868         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 869         if (attrs != NULL && attrs->ia_valid != 0) {
 870                 __be32 verf[2];
 871
 872                 p->o_arg.u.attrs = &p->attrs;
 873                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 874
 875                 verf[0] = jiffies;
 876                 verf[1] = current->pid;
 877                 memcpy(p->o_arg.u.verifier.data, verf,
 878                                 sizeof(p->o_arg.u.verifier.data));
 879         }
 880         p->c_arg.fh = &p->o_res.fh;
 881         p->c_arg.stateid = &p->o_res.stateid;
 882         p->c_arg.seqid = p->o_arg.seqid;
 883         nfs4_init_opendata_res(p);
 884         kref_init(&p->kref);
 885         return p;
 886 err_free:
 887         kfree(p);
 888 err:
 889         dput(parent);
 890         return NULL;
 891 }
 892
 893 static void nfs4_opendata_free(struct kref *kref)
 894 {
 895         struct nfs4_opendata *p = container_of(kref,
 896                         struct nfs4_opendata, kref);
 897         struct super_block *sb = p->dentry->d_sb;
 898
 899         nfs_free_seqid(p->o_arg.seqid);
 900         if (p->state != NULL)
 901                 nfs4_put_open_state(p->state);
 902         nfs4_put_state_owner(p->owner);
 903         dput(p->dir);
 904         dput(p->dentry);
 905         nfs_sb_deactive(sb);
 906         nfs_fattr_free_names(&p->f_attr);
 907         kfree(p);
 908 }
 909
 910 static void nfs4_opendata_put(struct nfs4_opendata *p)
 911 {
 912         if (p != NULL)
 913                 kref_put(&p->kref, nfs4_opendata_free);
 914 }
 915
 916 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 917 {
 918         int ret;
 919
 920         ret = rpc_wait_for_completion_task(task);
 921         return ret;
 922 }
 923
 924 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 925 {
 926         int ret = 0;
 927
 928         if (open_mode & (O_EXCL|O_TRUNC))
 929                 goto out;
 930         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 931                 case FMODE_READ:
 932                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 933                                 && state->n_rdonly != 0;
 934                         break;
 935                 case FMODE_WRITE:
 936                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 937                                 && state->n_wronly != 0;
 938                         break;
 939                 case FMODE_READ|FMODE_WRITE:
 940                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 941                                 && state->n_rdwr != 0;
 942         }
 943 out:
 944         return ret;
 945 }
 946
 947 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 948 {
 949         if (delegation == NULL)
 950                 return 0;
 951         if ((delegation->type & fmode) != fmode)
 952                 return 0;
 953         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 954                 return 0;
 955         nfs_mark_delegation_referenced(delegation);
 956         return 1;
 957 }
 958
 959 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 960 {
 961         switch (fmode) {
 962                 case FMODE_WRITE:
 963                         state->n_wronly++;
 964                         break;
 965                 case FMODE_READ:
 966                         state->n_rdonly++;
 967                         break;
 968                 case FMODE_READ|FMODE_WRITE:
 969                         state->n_rdwr++;
 970         }
 971         nfs4_state_set_mode_locked(state, state->state | fmode);
 972 }
 973
 974 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 975 {
 976         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 977                 nfs4_stateid_copy(&state->stateid, stateid);
 978         nfs4_stateid_copy(&state->open_stateid, stateid);
 979         switch (fmode) {
 980                 case FMODE_READ:
 981                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 982                         break;
 983                 case FMODE_WRITE:
 984                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 985                         break;
 986                 case FMODE_READ|FMODE_WRITE:
 987                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 988         }
 989 }
 990
 991 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 992 {
 993         write_seqlock(&state->seqlock);
 994         nfs_set_open_stateid_locked(state, stateid, fmode);
 995         write_sequnlock(&state->seqlock);
 996 }
 997
 998 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 999 {
1000         /*
1001          * Protect the call to nfs4_state_set_mode_locked and
1002          * serialise the stateid update
1003          */
1004         write_seqlock(&state->seqlock);
1005         if (deleg_stateid != NULL) {
1006                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1007                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1008         }
1009         if (open_stateid != NULL)
1010                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1011         write_sequnlock(&state->seqlock);
1012         spin_lock(&state->owner->so_lock);
1013         update_open_stateflags(state, fmode);
1014         spin_unlock(&state->owner->so_lock);
1015 }
1016
1017 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1018 {
1019         struct nfs_inode *nfsi = NFS_I(state->inode);
1020         struct nfs_delegation *deleg_cur;
1021         int ret = 0;
1022
1023         fmode &= (FMODE_READ|FMODE_WRITE);
1024
1025         rcu_read_lock();
1026         deleg_cur = rcu_dereference(nfsi->delegation);
1027         if (deleg_cur == NULL)
1028                 goto no_delegation;
1029
1030         spin_lock(&deleg_cur->lock);
1031         if (nfsi->delegation != deleg_cur ||
1032             (deleg_cur->type & fmode) != fmode)
1033                 goto no_delegation_unlock;
1034
1035         if (delegation == NULL)
1036                 delegation = &deleg_cur->stateid;
1037         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1038                 goto no_delegation_unlock;
1039
1040         nfs_mark_delegation_referenced(deleg_cur);
1041         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1042         ret = 1;
1043 no_delegation_unlock:
1044         spin_unlock(&deleg_cur->lock);
1045 no_delegation:
1046         rcu_read_unlock();
1047
1048         if (!ret && open_stateid != NULL) {
1049                 __update_open_stateid(state, open_stateid, NULL, fmode);
1050                 ret = 1;
1051         }
1052
1053         return ret;
1054 }
1055
1056
1057 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1058 {
1059         struct nfs_delegation *delegation;
1060
1061         rcu_read_lock();
1062         delegation = rcu_dereference(NFS_I(inode)->delegation);
1063         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1064                 rcu_read_unlock();
1065                 return;
1066         }
1067         rcu_read_unlock();
1068         nfs4_inode_return_delegation(inode);
1069 }
1070
1071 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1072 {
1073         struct nfs4_state *state = opendata->state;
1074         struct nfs_inode *nfsi = NFS_I(state->inode);
1075         struct nfs_delegation *delegation;
1076         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1077         fmode_t fmode = opendata->o_arg.fmode;
1078         nfs4_stateid stateid;
1079         int ret = -EAGAIN;
1080
1081         for (;;) {
1082                 if (can_open_cached(state, fmode, open_mode)) {
1083                         spin_lock(&state->owner->so_lock);
1084                         if (can_open_cached(state, fmode, open_mode)) {
1085                                 update_open_stateflags(state, fmode);
1086                                 spin_unlock(&state->owner->so_lock);
1087                                 goto out_return_state;
1088                         }
1089                         spin_unlock(&state->owner->so_lock);
1090                 }
1091                 rcu_read_lock();
1092                 delegation = rcu_dereference(nfsi->delegation);
1093                 if (!can_open_delegated(delegation, fmode)) {
1094                         rcu_read_unlock();
1095                         break;
1096                 }
1097                 /* Save the delegation */
1098                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1099                 rcu_read_unlock();
1100                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1101                 if (ret != 0)
1102                         goto out;
1103                 ret = -EAGAIN;
1104
1105                 /* Try to update the stateid using the delegation */
1106                 if (update_open_stateid(state, NULL, &stateid, fmode))
1107                         goto out_return_state;
1108         }
1109 out:
1110         return ERR_PTR(ret);
1111 out_return_state:
1112         atomic_inc(&state->count);
1113         return state;
1114 }
1115
1116 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1117 {
1118         struct inode *inode;
1119         struct nfs4_state *state = NULL;
1120         struct nfs_delegation *delegation;
1121         int ret;
1122
1123         if (!data->rpc_done) {
1124                 state = nfs4_try_open_cached(data);
1125                 goto out;
1126         }
1127
1128         ret = -EAGAIN;
1129         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1130                 goto err;
1131         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1132         ret = PTR_ERR(inode);
1133         if (IS_ERR(inode))
1134                 goto err;
1135         ret = -ENOMEM;
1136         state = nfs4_get_open_state(inode, data->owner);
1137         if (state == NULL)
1138                 goto err_put_inode;
1139         if (data->o_res.delegation_type != 0) {
1140                 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1141                 int delegation_flags = 0;
1142
1143                 rcu_read_lock();
1144                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1145                 if (delegation)
1146                         delegation_flags = delegation->flags;
1147                 rcu_read_unlock();
1148                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1149                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1150                                         "returning a delegation for "
1151                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1152                                         clp->cl_hostname);
1153                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1154                         nfs_inode_set_delegation(state->inode,
1155                                         data->owner->so_cred,
1156                                         &data->o_res);
1157                 else
1158                         nfs_inode_reclaim_delegation(state->inode,
1159                                         data->owner->so_cred,
1160                                         &data->o_res);
1161         }
1162
1163         update_open_stateid(state, &data->o_res.stateid, NULL,
1164                         data->o_arg.fmode);
1165         iput(inode);
1166 out:
1167         return state;
1168 err_put_inode:
1169         iput(inode);
1170 err:
1171         return ERR_PTR(ret);
1172 }
1173
1174 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1175 {
1176         struct nfs_inode *nfsi = NFS_I(state->inode);
1177         struct nfs_open_context *ctx;
1178
1179         spin_lock(&state->inode->i_lock);
1180         list_for_each_entry(ctx, &nfsi->open_files, list) {
1181                 if (ctx->state != state)
1182                         continue;
1183                 get_nfs_open_context(ctx);
1184                 spin_unlock(&state->inode->i_lock);
1185                 return ctx;
1186         }
1187         spin_unlock(&state->inode->i_lock);
1188         return ERR_PTR(-ENOENT);
1189 }
1190
1191 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1192 {
1193         struct nfs4_opendata *opendata;
1194
1195         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1196         if (opendata == NULL)
1197                 return ERR_PTR(-ENOMEM);
1198         opendata->state = state;
1199         atomic_inc(&state->count);
1200         return opendata;
1201 }
1202
1203 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1204 {
1205         struct nfs4_state *newstate;
1206         int ret;
1207
1208         opendata->o_arg.open_flags = 0;
1209         opendata->o_arg.fmode = fmode;
1210         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1211         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1212         nfs4_init_opendata_res(opendata);
1213         ret = _nfs4_recover_proc_open(opendata);
1214         if (ret != 0)
1215                 return ret;
1216         newstate = nfs4_opendata_to_nfs4_state(opendata);
1217         if (IS_ERR(newstate))
1218                 return PTR_ERR(newstate);
1219         nfs4_close_state(newstate, fmode);
1220         *res = newstate;
1221         return 0;
1222 }
1223
1224 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1225 {
1226         struct nfs4_state *newstate;
1227         int ret;
1228
1229         /* memory barrier prior to reading state->n_* */
1230         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1231         smp_rmb();
1232         if (state->n_rdwr != 0) {
1233                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1234                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1235                 if (ret != 0)
1236                         return ret;
1237                 if (newstate != state)
1238                         return -ESTALE;
1239         }
1240         if (state->n_wronly != 0) {
1241                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1242                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1243                 if (ret != 0)
1244                         return ret;
1245                 if (newstate != state)
1246                         return -ESTALE;
1247         }
1248         if (state->n_rdonly != 0) {
1249                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1250                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1251                 if (ret != 0)
1252                         return ret;
1253                 if (newstate != state)
1254                         return -ESTALE;
1255         }
1256         /*
1257          * We may have performed cached opens for all three recoveries.
1258          * Check if we need to update the current stateid.
1259          */
1260         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1261             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1262                 write_seqlock(&state->seqlock);
1263                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1264                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1265                 write_sequnlock(&state->seqlock);
1266         }
1267         return 0;
1268 }
1269
1270 /*
1271  * OPEN_RECLAIM:
1272  *      reclaim state on the server after a reboot.
1273  */
1274 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1275 {
1276         struct nfs_delegation *delegation;
1277         struct nfs4_opendata *opendata;
1278         fmode_t delegation_type = 0;
1279         int status;
1280
1281         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1282         if (IS_ERR(opendata))
1283                 return PTR_ERR(opendata);
1284         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1285         opendata->o_arg.fh = NFS_FH(state->inode);
1286         rcu_read_lock();
1287         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1288         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1289                 delegation_type = delegation->type;
1290         rcu_read_unlock();
1291         opendata->o_arg.u.delegation_type = delegation_type;
1292         status = nfs4_open_recover(opendata, state);
1293         nfs4_opendata_put(opendata);
1294         return status;
1295 }
1296
1297 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1298 {
1299         struct nfs_server *server = NFS_SERVER(state->inode);
1300         struct nfs4_exception exception = { };
1301         int err;
1302         do {
1303                 err = _nfs4_do_open_reclaim(ctx, state);
1304                 if (err != -NFS4ERR_DELAY)
1305                         break;
1306                 nfs4_handle_exception(server, err, &exception);
1307         } while (exception.retry);
1308         return err;
1309 }
1310
1311 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1312 {
1313         struct nfs_open_context *ctx;
1314         int ret;
1315
1316         ctx = nfs4_state_find_open_context(state);
1317         if (IS_ERR(ctx))
1318                 return PTR_ERR(ctx);
1319         ret = nfs4_do_open_reclaim(ctx, state);
1320         put_nfs_open_context(ctx);
1321         return ret;
1322 }
1323
1324 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1325 {
1326         struct nfs4_opendata *opendata;
1327         int ret;
1328
1329         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1330         if (IS_ERR(opendata))
1331                 return PTR_ERR(opendata);
1332         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1333         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1334         ret = nfs4_open_recover(opendata, state);
1335         nfs4_opendata_put(opendata);
1336         return ret;
1337 }
1338
1339 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1340 {
1341         struct nfs4_exception exception = { };
1342         struct nfs_server *server = NFS_SERVER(state->inode);
1343         int err;
1344         do {
1345                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1346                 switch (err) {
1347                         case 0:
1348                         case -ENOENT:
1349                         case -ESTALE:
1350                                 goto out;
1351                         case -NFS4ERR_BADSESSION:
1352                         case -NFS4ERR_BADSLOT:
1353                         case -NFS4ERR_BAD_HIGH_SLOT:
1354                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1355                         case -NFS4ERR_DEADSESSION:
1356                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1357                                 goto out;
1358                         case -NFS4ERR_STALE_CLIENTID:
1359                         case -NFS4ERR_STALE_STATEID:
1360                         case -NFS4ERR_EXPIRED:
1361                                 /* Don't recall a delegation if it was lost */
1362                                 nfs4_schedule_lease_recovery(server->nfs_client);
1363                                 goto out;
1364                         case -ERESTARTSYS:
1365                                 /*
1366                                  * The show must go on: exit, but mark the
1367                                  * stateid as needing recovery.
1368                                  */
1369                         case -NFS4ERR_DELEG_REVOKED:
1370                         case -NFS4ERR_ADMIN_REVOKED:
1371                         case -NFS4ERR_BAD_STATEID:
1372                                 nfs_inode_find_state_and_recover(state->inode,
1373                                                 stateid);
1374                                 nfs4_schedule_stateid_recovery(server, state);
1375                         case -EKEYEXPIRED:
1376                                 /*
1377                                  * User RPCSEC_GSS context has expired.
1378                                  * We cannot recover this stateid now, so
1379                                  * skip it and allow recovery thread to
1380                                  * proceed.
1381                                  */
1382                         case -ENOMEM:
1383                                 err = 0;
1384                                 goto out;
1385                 }
1386                 err = nfs4_handle_exception(server, err, &exception);
1387         } while (exception.retry);
1388 out:
1389         return err;
1390 }
1391
1392 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1393 {
1394         struct nfs4_opendata *data = calldata;
1395
1396         data->rpc_status = task->tk_status;
1397         if (data->rpc_status == 0) {
1398                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1399                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1400                 renew_lease(data->o_res.server, data->timestamp);
1401                 data->rpc_done = 1;
1402         }
1403 }
1404
1405 static void nfs4_open_confirm_release(void *calldata)
1406 {
1407         struct nfs4_opendata *data = calldata;
1408         struct nfs4_state *state = NULL;
1409
1410         /* If this request hasn't been cancelled, do nothing */
1411         if (data->cancelled == 0)
1412                 goto out_free;
1413         /* In case of error, no cleanup! */
1414         if (!data->rpc_done)
1415                 goto out_free;
1416         state = nfs4_opendata_to_nfs4_state(data);
1417         if (!IS_ERR(state))
1418                 nfs4_close_state(state, data->o_arg.fmode);
1419 out_free:
1420         nfs4_opendata_put(data);
1421 }
1422
1423 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1424         .rpc_call_done = nfs4_open_confirm_done,
1425         .rpc_release = nfs4_open_confirm_release,
1426 };
1427
1428 /*
1429  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1430  */
1431 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1432 {
1433         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1434         struct rpc_task *task;
1435         struct  rpc_message msg = {
1436                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1437                 .rpc_argp = &data->c_arg,
1438                 .rpc_resp = &data->c_res,
1439                 .rpc_cred = data->owner->so_cred,
1440         };
1441         struct rpc_task_setup task_setup_data = {
1442                 .rpc_client = server->client,
1443                 .rpc_message = &msg,
1444                 .callback_ops = &nfs4_open_confirm_ops,
1445                 .callback_data = data,
1446                 .workqueue = nfsiod_workqueue,
1447                 .flags = RPC_TASK_ASYNC,
1448         };
1449         int status;
1450
1451         kref_get(&data->kref);
1452         data->rpc_done = 0;
1453         data->rpc_status = 0;
1454         data->timestamp = jiffies;
1455         task = rpc_run_task(&task_setup_data);
1456         if (IS_ERR(task))
1457                 return PTR_ERR(task);
1458         status = nfs4_wait_for_completion_rpc_task(task);
1459         if (status != 0) {
1460                 data->cancelled = 1;
1461                 smp_wmb();
1462         } else
1463                 status = data->rpc_status;
1464         rpc_put_task(task);
1465         return status;
1466 }
1467
1468 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1469 {
1470         struct nfs4_opendata *data = calldata;
1471         struct nfs4_state_owner *sp = data->owner;
1472
1473         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1474                 return;
1475         /*
1476          * Check if we still need to send an OPEN call, or if we can use
1477          * a delegation instead.
1478          */
1479         if (data->state != NULL) {
1480                 struct nfs_delegation *delegation;
1481
1482                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1483                         goto out_no_action;
1484                 rcu_read_lock();
1485                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1486                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1487                     can_open_delegated(delegation, data->o_arg.fmode))
1488                         goto unlock_no_action;
1489                 rcu_read_unlock();
1490         }
1491         /* Update client id. */
1492         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1493         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1494                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1495                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1496         }
1497         data->timestamp = jiffies;
1498         if (nfs4_setup_sequence(data->o_arg.server,
1499                                 &data->o_arg.seq_args,
1500                                 &data->o_res.seq_res, task))
1501                 return;
1502         rpc_call_start(task);
1503         return;
1504 unlock_no_action:
1505         rcu_read_unlock();
1506 out_no_action:
1507         task->tk_action = NULL;
1508
1509 }
1510
1511 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1512 {
1513         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1514         nfs4_open_prepare(task, calldata);
1515 }
1516
1517 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1518 {
1519         struct nfs4_opendata *data = calldata;
1520
1521         data->rpc_status = task->tk_status;
1522
1523         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1524                 return;
1525
1526         if (task->tk_status == 0) {
1527                 switch (data->o_res.f_attr->mode & S_IFMT) {
1528                         case S_IFREG:
1529                                 break;
1530                         case S_IFLNK:
1531                                 data->rpc_status = -ELOOP;
1532                                 break;
1533                         case S_IFDIR:
1534                                 data->rpc_status = -EISDIR;
1535                                 break;
1536                         default:
1537                                 data->rpc_status = -ENOTDIR;
1538                 }
1539                 renew_lease(data->o_res.server, data->timestamp);
1540                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1541                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1542         }
1543         data->rpc_done = 1;
1544 }
1545
1546 static void nfs4_open_release(void *calldata)
1547 {
1548         struct nfs4_opendata *data = calldata;
1549         struct nfs4_state *state = NULL;
1550
1551         /* If this request hasn't been cancelled, do nothing */
1552         if (data->cancelled == 0)
1553                 goto out_free;
1554         /* In case of error, no cleanup! */
1555         if (data->rpc_status != 0 || !data->rpc_done)
1556                 goto out_free;
1557         /* In case we need an open_confirm, no cleanup! */
1558         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1559                 goto out_free;
1560         state = nfs4_opendata_to_nfs4_state(data);
1561         if (!IS_ERR(state))
1562                 nfs4_close_state(state, data->o_arg.fmode);
1563 out_free:
1564         nfs4_opendata_put(data);
1565 }
1566
1567 static const struct rpc_call_ops nfs4_open_ops = {
1568         .rpc_call_prepare = nfs4_open_prepare,
1569         .rpc_call_done = nfs4_open_done,
1570         .rpc_release = nfs4_open_release,
1571 };
1572
1573 static const struct rpc_call_ops nfs4_recover_open_ops = {
1574         .rpc_call_prepare = nfs4_recover_open_prepare,
1575         .rpc_call_done = nfs4_open_done,
1576         .rpc_release = nfs4_open_release,
1577 };
1578
1579 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1580 {
1581         struct inode *dir = data->dir->d_inode;
1582         struct nfs_server *server = NFS_SERVER(dir);
1583         struct nfs_openargs *o_arg = &data->o_arg;
1584         struct nfs_openres *o_res = &data->o_res;
1585         struct rpc_task *task;
1586         struct rpc_message msg = {
1587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1588                 .rpc_argp = o_arg,
1589                 .rpc_resp = o_res,
1590                 .rpc_cred = data->owner->so_cred,
1591         };
1592         struct rpc_task_setup task_setup_data = {
1593                 .rpc_client = server->client,
1594                 .rpc_message = &msg,
1595                 .callback_ops = &nfs4_open_ops,
1596                 .callback_data = data,
1597                 .workqueue = nfsiod_workqueue,
1598                 .flags = RPC_TASK_ASYNC,
1599         };
1600         int status;
1601
1602         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1603         kref_get(&data->kref);
1604         data->rpc_done = 0;
1605         data->rpc_status = 0;
1606         data->cancelled = 0;
1607         if (isrecover)
1608                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1609         task = rpc_run_task(&task_setup_data);
1610         if (IS_ERR(task))
1611                 return PTR_ERR(task);
1612         status = nfs4_wait_for_completion_rpc_task(task);
1613         if (status != 0) {
1614                 data->cancelled = 1;
1615                 smp_wmb();
1616         } else
1617                 status = data->rpc_status;
1618         rpc_put_task(task);
1619
1620         return status;
1621 }
1622
1623 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1624 {
1625         struct inode *dir = data->dir->d_inode;
1626         struct nfs_openres *o_res = &data->o_res;
1627         int status;
1628
1629         status = nfs4_run_open_task(data, 1);
1630         if (status != 0 || !data->rpc_done)
1631                 return status;
1632
1633         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1634
1635         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1636                 status = _nfs4_proc_open_confirm(data);
1637                 if (status != 0)
1638                         return status;
1639         }
1640
1641         return status;
1642 }
1643
1644 /*
1645  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1646  */
1647 static int _nfs4_proc_open(struct nfs4_opendata *data)
1648 {
1649         struct inode *dir = data->dir->d_inode;
1650         struct nfs_server *server = NFS_SERVER(dir);
1651         struct nfs_openargs *o_arg = &data->o_arg;
1652         struct nfs_openres *o_res = &data->o_res;
1653         int status;
1654
1655         status = nfs4_run_open_task(data, 0);
1656         if (!data->rpc_done)
1657                 return status;
1658         if (status != 0) {
1659                 if (status == -NFS4ERR_BADNAME &&
1660                                 !(o_arg->open_flags & O_CREAT))
1661                         return -ENOENT;
1662                 return status;
1663         }
1664
1665         nfs_fattr_map_and_free_names(server, &data->f_attr);
1666
1667         if (o_arg->open_flags & O_CREAT)
1668                 update_changeattr(dir, &o_res->cinfo);
1669         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1670                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1671         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1672                 status = _nfs4_proc_open_confirm(data);
1673                 if (status != 0)
1674                         return status;
1675         }
1676         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1677                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1678         return 0;
1679 }
1680
1681 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1682 {
1683         unsigned int loop;
1684         int ret;
1685
1686         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1687                 ret = nfs4_wait_clnt_recover(clp);
1688                 if (ret != 0)
1689                         break;
1690                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1691                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1692                         break;
1693                 nfs4_schedule_state_manager(clp);
1694                 ret = -EIO;
1695         }
1696         return ret;
1697 }
1698
1699 static int nfs4_recover_expired_lease(struct nfs_server *server)
1700 {
1701         return nfs4_client_recover_expired_lease(server->nfs_client);
1702 }
1703
1704 /*
1705  * OPEN_EXPIRED:
1706  *      reclaim state on the server after a network partition.
1707  *      Assumes caller holds the appropriate lock
1708  */
1709 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1710 {
1711         struct nfs4_opendata *opendata;
1712         int ret;
1713
1714         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1715         if (IS_ERR(opendata))
1716                 return PTR_ERR(opendata);
1717         ret = nfs4_open_recover(opendata, state);
1718         if (ret == -ESTALE)
1719                 d_drop(ctx->dentry);
1720         nfs4_opendata_put(opendata);
1721         return ret;
1722 }
1723
1724 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1725 {
1726         struct nfs_server *server = NFS_SERVER(state->inode);
1727         struct nfs4_exception exception = { };
1728         int err;
1729
1730         do {
1731                 err = _nfs4_open_expired(ctx, state);
1732                 switch (err) {
1733                 default:
1734                         goto out;
1735                 case -NFS4ERR_GRACE:
1736                 case -NFS4ERR_DELAY:
1737                         nfs4_handle_exception(server, err, &exception);
1738                         err = 0;
1739                 }
1740         } while (exception.retry);
1741 out:
1742         return err;
1743 }
1744
1745 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1746 {
1747         struct nfs_open_context *ctx;
1748         int ret;
1749
1750         ctx = nfs4_state_find_open_context(state);
1751         if (IS_ERR(ctx))
1752                 return PTR_ERR(ctx);
1753         ret = nfs4_do_open_expired(ctx, state);
1754         put_nfs_open_context(ctx);
1755         return ret;
1756 }
1757
1758 #if defined(CONFIG_NFS_V4_1)
1759 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1760 {
1761         struct nfs_server *server = NFS_SERVER(state->inode);
1762         nfs4_stateid *stateid = &state->stateid;
1763         int status;
1764
1765         /* If a state reset has been done, test_stateid is unneeded */
1766         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1767                 return;
1768
1769         status = nfs41_test_stateid(server, stateid);
1770         if (status != NFS_OK) {
1771                 /* Free the stateid unless the server explicitly
1772                  * informs us the stateid is unrecognized. */
1773                 if (status != -NFS4ERR_BAD_STATEID)
1774                         nfs41_free_stateid(server, stateid);
1775
1776                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1777         }
1778 }
1779
1780 /**
1781  * nfs41_check_open_stateid - possibly free an open stateid
1782  *
1783  * @state: NFSv4 state for an inode
1784  *
1785  * Returns NFS_OK if recovery for this stateid is now finished.
1786  * Otherwise a negative NFS4ERR value is returned.
1787  */
1788 static int nfs41_check_open_stateid(struct nfs4_state *state)
1789 {
1790         struct nfs_server *server = NFS_SERVER(state->inode);
1791         nfs4_stateid *stateid = &state->stateid;
1792         int status;
1793
1794         /* If a state reset has been done, test_stateid is unneeded */
1795         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1796             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1797             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1798                 return -NFS4ERR_BAD_STATEID;
1799
1800         status = nfs41_test_stateid(server, stateid);
1801         if (status != NFS_OK) {
1802                 /* Free the stateid unless the server explicitly
1803                  * informs us the stateid is unrecognized. */
1804                 if (status != -NFS4ERR_BAD_STATEID)
1805                         nfs41_free_stateid(server, stateid);
1806
1807                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1808                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1809                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1810         }
1811         return status;
1812 }
1813
1814 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1815 {
1816         int status;
1817
1818         nfs41_clear_delegation_stateid(state);
1819         status = nfs41_check_open_stateid(state);
1820         if (status != NFS_OK)
1821                 status = nfs4_open_expired(sp, state);
1822         return status;
1823 }
1824 #endif
1825
1826 /*
1827  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1828  * fields corresponding to attributes that were used to store the verifier.
1829  * Make sure we clobber those fields in the later setattr call
1830  */
1831 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1832 {
1833         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1834             !(sattr->ia_valid & ATTR_ATIME_SET))
1835                 sattr->ia_valid |= ATTR_ATIME;
1836
1837         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1838             !(sattr->ia_valid & ATTR_MTIME_SET))
1839                 sattr->ia_valid |= ATTR_MTIME;
1840 }
1841
1842 /*
1843  * Returns a referenced nfs4_state
1844  */
1845 static int _nfs4_do_open(struct inode *dir,
1846                         struct dentry *dentry,
1847                         fmode_t fmode,
1848                         int flags,
1849                         struct iattr *sattr,
1850                         struct rpc_cred *cred,
1851                         struct nfs4_state **res,
1852                         struct nfs4_threshold **ctx_th)
1853 {
1854         struct nfs4_state_owner  *sp;
1855         struct nfs4_state     *state = NULL;
1856         struct nfs_server       *server = NFS_SERVER(dir);
1857         struct nfs4_opendata *opendata;
1858         int status;
1859
1860         /* Protect against reboot recovery conflicts */
1861         status = -ENOMEM;
1862         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1863         if (sp == NULL) {
1864                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1865                 goto out_err;
1866         }
1867         status = nfs4_recover_expired_lease(server);
1868         if (status != 0)
1869                 goto err_put_state_owner;
1870         if (dentry->d_inode != NULL)
1871                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1872         status = -ENOMEM;
1873         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1874         if (opendata == NULL)
1875                 goto err_put_state_owner;
1876
1877         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1878                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1879                 if (!opendata->f_attr.mdsthreshold)
1880                         goto err_opendata_put;
1881                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1882         }
1883         if (dentry->d_inode != NULL)
1884                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1885
1886         status = _nfs4_proc_open(opendata);
1887         if (status != 0)
1888                 goto err_opendata_put;
1889
1890         state = nfs4_opendata_to_nfs4_state(opendata);
1891         status = PTR_ERR(state);
1892         if (IS_ERR(state))
1893                 goto err_opendata_put;
1894         if (server->caps & NFS_CAP_POSIX_LOCK)
1895                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1896
1897         if (opendata->o_arg.open_flags & O_EXCL) {
1898                 nfs4_exclusive_attrset(opendata, sattr);
1899
1900                 nfs_fattr_init(opendata->o_res.f_attr);
1901                 status = nfs4_do_setattr(state->inode, cred,
1902                                 opendata->o_res.f_attr, sattr,
1903                                 state);
1904                 if (status == 0)
1905                         nfs_setattr_update_inode(state->inode, sattr);
1906                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1907         }
1908
1909         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1910                 *ctx_th = opendata->f_attr.mdsthreshold;
1911         else
1912                 kfree(opendata->f_attr.mdsthreshold);
1913         opendata->f_attr.mdsthreshold = NULL;
1914
1915         nfs4_opendata_put(opendata);
1916         nfs4_put_state_owner(sp);
1917         *res = state;
1918         return 0;
1919 err_opendata_put:
1920         kfree(opendata->f_attr.mdsthreshold);
1921         nfs4_opendata_put(opendata);
1922 err_put_state_owner:
1923         nfs4_put_state_owner(sp);
1924 out_err:
1925         *res = NULL;
1926         return status;
1927 }
1928
1929
1930 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1931                                         struct dentry *dentry,
1932                                         fmode_t fmode,
1933                                         int flags,
1934                                         struct iattr *sattr,
1935                                         struct rpc_cred *cred,
1936                                         struct nfs4_threshold **ctx_th)
1937 {
1938         struct nfs4_exception exception = { };
1939         struct nfs4_state *res;
1940         int status;
1941
1942         fmode &= FMODE_READ|FMODE_WRITE;
1943         do {
1944                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1945                                        &res, ctx_th);
1946                 if (status == 0)
1947                         break;
1948                 /* NOTE: BAD_SEQID means the server and client disagree about the
1949                  * book-keeping w.r.t. state-changing operations
1950                  * (OPEN/CLOSE/LOCK/LOCKU...)
1951                  * It is actually a sign of a bug on the client or on the server.
1952                  *
1953                  * If we receive a BAD_SEQID error in the particular case of
1954                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1955                  * have unhashed the old state_owner for us, and that we can
1956                  * therefore safely retry using a new one. We should still warn
1957                  * the user though...
1958                  */
1959                 if (status == -NFS4ERR_BAD_SEQID) {
1960                         pr_warn_ratelimited("NFS: v4 server %s "
1961                                         " returned a bad sequence-id error!\n",
1962                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1963                         exception.retry = 1;
1964                         continue;
1965                 }
1966                 /*
1967                  * BAD_STATEID on OPEN means that the server cancelled our
1968                  * state before it received the OPEN_CONFIRM.
1969                  * Recover by retrying the request as per the discussion
1970                  * on Page 181 of RFC3530.
1971                  */
1972                 if (status == -NFS4ERR_BAD_STATEID) {
1973                         exception.retry = 1;
1974                         continue;
1975                 }
1976                 if (status == -EAGAIN) {
1977                         /* We must have found a delegation */
1978                         exception.retry = 1;
1979                         continue;
1980                 }
1981                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1982                                         status, &exception));
1983         } while (exception.retry);
1984         return res;
1985 }
1986
1987 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1988                             struct nfs_fattr *fattr, struct iattr *sattr,
1989                             struct nfs4_state *state)
1990 {
1991         struct nfs_server *server = NFS_SERVER(inode);
1992         struct nfs_setattrargs  arg = {
1993                 .fh             = NFS_FH(inode),
1994                 .iap            = sattr,
1995                 .server         = server,
1996                 .bitmask = server->attr_bitmask,
1997         };
1998         struct nfs_setattrres  res = {
1999                 .fattr          = fattr,
2000                 .server         = server,
2001         };
2002         struct rpc_message msg = {
2003                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2004                 .rpc_argp       = &arg,
2005                 .rpc_resp       = &res,
2006                 .rpc_cred       = cred,
2007         };
2008         unsigned long timestamp = jiffies;
2009         int status;
2010
2011         nfs_fattr_init(fattr);
2012
2013         if (state != NULL) {
2014                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2015                                 current->files, current->tgid);
2016         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2017                                 FMODE_WRITE)) {
2018                 /* Use that stateid */
2019         } else
2020                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2021
2022         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2023         if (status == 0 && state != NULL)
2024                 renew_lease(server, timestamp);
2025         return status;
2026 }
2027
2028 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2029                            struct nfs_fattr *fattr, struct iattr *sattr,
2030                            struct nfs4_state *state)
2031 {
2032         struct nfs_server *server = NFS_SERVER(inode);
2033         struct nfs4_exception exception = {
2034                 .state = state,
2035                 .inode = inode,
2036         };
2037         int err;
2038         do {
2039                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2040                 switch (err) {
2041                 case -NFS4ERR_OPENMODE:
2042                         if (state && !(state->state & FMODE_WRITE)) {
2043                                 err = -EBADF;
2044                                 if (sattr->ia_valid & ATTR_OPEN)
2045                                         err = -EACCES;
2046                                 goto out;
2047                         }
2048                 }
2049                 err = nfs4_handle_exception(server, err, &exception);
2050         } while (exception.retry);
2051 out:
2052         return err;
2053 }
2054
2055 struct nfs4_closedata {
2056         struct inode *inode;
2057         struct nfs4_state *state;
2058         struct nfs_closeargs arg;
2059         struct nfs_closeres res;
2060         struct nfs_fattr fattr;
2061         unsigned long timestamp;
2062         bool roc;
2063         u32 roc_barrier;
2064 };
2065
2066 static void nfs4_free_closedata(void *data)
2067 {
2068         struct nfs4_closedata *calldata = data;
2069         struct nfs4_state_owner *sp = calldata->state->owner;
2070         struct super_block *sb = calldata->state->inode->i_sb;
2071
2072         if (calldata->roc)
2073                 pnfs_roc_release(calldata->state->inode);
2074         nfs4_put_open_state(calldata->state);
2075         nfs_free_seqid(calldata->arg.seqid);
2076         nfs4_put_state_owner(sp);
2077         nfs_sb_deactive(sb);
2078         kfree(calldata);
2079 }
2080
2081 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2082                 fmode_t fmode)
2083 {
2084         spin_lock(&state->owner->so_lock);
2085         if (!(fmode & FMODE_READ))
2086                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2087         if (!(fmode & FMODE_WRITE))
2088                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2089         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2090         spin_unlock(&state->owner->so_lock);
2091 }
2092
2093 static void nfs4_close_done(struct rpc_task *task, void *data)
2094 {
2095         struct nfs4_closedata *calldata = data;
2096         struct nfs4_state *state = calldata->state;
2097         struct nfs_server *server = NFS_SERVER(calldata->inode);
2098
2099         dprintk("%s: begin!\n", __func__);
2100         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2101                 return;
2102         /* hmm. we are done with the inode, and in the process of freeing
2103          * the state_owner. we keep this around to process errors
2104          */
2105         switch (task->tk_status) {
2106                 case 0:
2107                         if (calldata->roc)
2108                                 pnfs_roc_set_barrier(state->inode,
2109                                                      calldata->roc_barrier);
2110                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2111                         renew_lease(server, calldata->timestamp);
2112                         nfs4_close_clear_stateid_flags(state,
2113                                         calldata->arg.fmode);
2114                         break;
2115                 case -NFS4ERR_STALE_STATEID:
2116                 case -NFS4ERR_OLD_STATEID:
2117                 case -NFS4ERR_BAD_STATEID:
2118                 case -NFS4ERR_EXPIRED:
2119                         if (calldata->arg.fmode == 0)
2120                                 break;
2121                 default:
2122                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2123                                 rpc_restart_call_prepare(task);
2124         }
2125         nfs_release_seqid(calldata->arg.seqid);
2126         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2127         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2128 }
2129
2130 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2131 {
2132         struct nfs4_closedata *calldata = data;
2133         struct nfs4_state *state = calldata->state;
2134         int call_close = 0;
2135
2136         dprintk("%s: begin!\n", __func__);
2137         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2138                 return;
2139
2140         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2141         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2142         spin_lock(&state->owner->so_lock);
2143         /* Calculate the change in open mode */
2144         if (state->n_rdwr == 0) {
2145                 if (state->n_rdonly == 0) {
2146                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2147                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2148                         calldata->arg.fmode &= ~FMODE_READ;
2149                 }
2150                 if (state->n_wronly == 0) {
2151                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2152                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2153                         calldata->arg.fmode &= ~FMODE_WRITE;
2154                 }
2155         }
2156         spin_unlock(&state->owner->so_lock);
2157
2158         if (!call_close) {
2159                 /* Note: exit _without_ calling nfs4_close_done */
2160                 task->tk_action = NULL;
2161                 goto out;
2162         }
2163
2164         if (calldata->arg.fmode == 0) {
2165                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2166                 if (calldata->roc &&
2167                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2168                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2169                                      task, NULL);
2170                         goto out;
2171                 }
2172         }
2173
2174         nfs_fattr_init(calldata->res.fattr);
2175         calldata->timestamp = jiffies;
2176         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2177                                 &calldata->arg.seq_args,
2178                                 &calldata->res.seq_res,
2179                                 task))
2180                 goto out;
2181         rpc_call_start(task);
2182 out:
2183         dprintk("%s: done!\n", __func__);
2184 }
2185
2186 static const struct rpc_call_ops nfs4_close_ops = {
2187         .rpc_call_prepare = nfs4_close_prepare,
2188         .rpc_call_done = nfs4_close_done,
2189         .rpc_release = nfs4_free_closedata,
2190 };
2191
2192 /*
2193  * It is possible for data to be read/written from a mem-mapped file
2194  * after the sys_close call (which hits the vfs layer as a flush).
2195  * This means that we can't safely call nfsv4 close on a file until
2196  * the inode is cleared. This in turn means that we are not good
2197  * NFSv4 citizens - we do not indicate to the server to update the file's
2198  * share state even when we are done with one of the three share
2199  * stateid's in the inode.
2200  *
2201  * NOTE: Caller must be holding the sp->so_owner semaphore!
2202  */
2203 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2204 {
2205         struct nfs_server *server = NFS_SERVER(state->inode);
2206         struct nfs4_closedata *calldata;
2207         struct nfs4_state_owner *sp = state->owner;
2208         struct rpc_task *task;
2209         struct rpc_message msg = {
2210                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2211                 .rpc_cred = state->owner->so_cred,
2212         };
2213         struct rpc_task_setup task_setup_data = {
2214                 .rpc_client = server->client,
2215                 .rpc_message = &msg,
2216                 .callback_ops = &nfs4_close_ops,
2217                 .workqueue = nfsiod_workqueue,
2218                 .flags = RPC_TASK_ASYNC,
2219         };
2220         int status = -ENOMEM;
2221
2222         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2223         if (calldata == NULL)
2224                 goto out;
2225         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2226         calldata->inode = state->inode;
2227         calldata->state = state;
2228         calldata->arg.fh = NFS_FH(state->inode);
2229         calldata->arg.stateid = &state->open_stateid;
2230         /* Serialization for the sequence id */
2231         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2232         if (calldata->arg.seqid == NULL)
2233                 goto out_free_calldata;
2234         calldata->arg.fmode = 0;
2235         calldata->arg.bitmask = server->cache_consistency_bitmask;
2236         calldata->res.fattr = &calldata->fattr;
2237         calldata->res.seqid = calldata->arg.seqid;
2238         calldata->res.server = server;
2239         calldata->roc = roc;
2240         nfs_sb_active(calldata->inode->i_sb);
2241
2242         msg.rpc_argp = &calldata->arg;
2243         msg.rpc_resp = &calldata->res;
2244         task_setup_data.callback_data = calldata;
2245         task = rpc_run_task(&task_setup_data);
2246         if (IS_ERR(task))
2247                 return PTR_ERR(task);
2248         status = 0;
2249         if (wait)
2250                 status = rpc_wait_for_completion_task(task);
2251         rpc_put_task(task);
2252         return status;
2253 out_free_calldata:
2254         kfree(calldata);
2255 out:
2256         if (roc)
2257                 pnfs_roc_release(state->inode);
2258         nfs4_put_open_state(state);
2259         nfs4_put_state_owner(sp);
2260         return status;
2261 }
2262
2263 static struct inode *
2264 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2265 {
2266         struct nfs4_state *state;
2267
2268         /* Protect against concurrent sillydeletes */
2269         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2270                              ctx->cred, &ctx->mdsthreshold);
2271         if (IS_ERR(state))
2272                 return ERR_CAST(state);
2273         ctx->state = state;
2274         return igrab(state->inode);
2275 }
2276
2277 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2278 {
2279         if (ctx->state == NULL)
2280                 return;
2281         if (is_sync)
2282                 nfs4_close_sync(ctx->state, ctx->mode);
2283         else
2284                 nfs4_close_state(ctx->state, ctx->mode);
2285 }
2286
2287 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2288 {
2289         struct nfs4_server_caps_arg args = {
2290                 .fhandle = fhandle,
2291         };
2292         struct nfs4_server_caps_res res = {};
2293         struct rpc_message msg = {
2294                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2295                 .rpc_argp = &args,
2296                 .rpc_resp = &res,
2297         };
2298         int status;
2299
2300         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2301         if (status == 0) {
2302                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2303                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2304                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2305                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2306                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2307                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2308                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2309                         server->caps |= NFS_CAP_ACLS;
2310                 if (res.has_links != 0)
2311                         server->caps |= NFS_CAP_HARDLINKS;
2312                 if (res.has_symlinks != 0)
2313                         server->caps |= NFS_CAP_SYMLINKS;
2314                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2315                         server->caps |= NFS_CAP_FILEID;
2316                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2317                         server->caps |= NFS_CAP_MODE;
2318                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2319                         server->caps |= NFS_CAP_NLINK;
2320                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2321                         server->caps |= NFS_CAP_OWNER;
2322                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2323                         server->caps |= NFS_CAP_OWNER_GROUP;
2324                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2325                         server->caps |= NFS_CAP_ATIME;
2326                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2327                         server->caps |= NFS_CAP_CTIME;
2328                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2329                         server->caps |= NFS_CAP_MTIME;
2330
2331                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2332                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2333                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2334                 server->acl_bitmask = res.acl_bitmask;
2335                 server->fh_expire_type = res.fh_expire_type;
2336         }
2337
2338         return status;
2339 }
2340
2341 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2342 {
2343         struct nfs4_exception exception = { };
2344         int err;
2345         do {
2346                 err = nfs4_handle_exception(server,
2347                                 _nfs4_server_capabilities(server, fhandle),
2348                                 &exception);
2349         } while (exception.retry);
2350         return err;
2351 }
2352
2353 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2354                 struct nfs_fsinfo *info)
2355 {
2356         struct nfs4_lookup_root_arg args = {
2357                 .bitmask = nfs4_fattr_bitmap,
2358         };
2359         struct nfs4_lookup_res res = {
2360                 .server = server,
2361                 .fattr = info->fattr,
2362                 .fh = fhandle,
2363         };
2364         struct rpc_message msg = {
2365                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2366                 .rpc_argp = &args,
2367                 .rpc_resp = &res,
2368         };
2369
2370         nfs_fattr_init(info->fattr);
2371         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2372 }
2373
2374 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2375                 struct nfs_fsinfo *info)
2376 {
2377         struct nfs4_exception exception = { };
2378         int err;
2379         do {
2380                 err = _nfs4_lookup_root(server, fhandle, info);
2381                 switch (err) {
2382                 case 0:
2383                 case -NFS4ERR_WRONGSEC:
2384                         goto out;
2385                 default:
2386                         err = nfs4_handle_exception(server, err, &exception);
2387                 }
2388         } while (exception.retry);
2389 out:
2390         return err;
2391 }
2392
2393 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2394                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2395 {
2396         struct rpc_auth *auth;
2397         int ret;
2398
2399         auth = rpcauth_create(flavor, server->client);
2400         if (!auth) {
2401                 ret = -EIO;
2402                 goto out;
2403         }
2404         ret = nfs4_lookup_root(server, fhandle, info);
2405 out:
2406         return ret;
2407 }
2408
2409 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2410                               struct nfs_fsinfo *info)
2411 {
2412         int i, len, status = 0;
2413         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2414
2415         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2416         flav_array[len] = RPC_AUTH_NULL;
2417         len += 1;
2418
2419         for (i = 0; i < len; i++) {
2420                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2421                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2422                         continue;
2423                 break;
2424         }
2425         /*
2426          * -EACCESS could mean that the user doesn't have correct permissions
2427          * to access the mount.  It could also mean that we tried to mount
2428          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2429          * existing mount programs don't handle -EACCES very well so it should
2430          * be mapped to -EPERM instead.
2431          */
2432         if (status == -EACCES)
2433                 status = -EPERM;
2434         return status;
2435 }
2436
2437 /*
2438  * get the file handle for the "/" directory on the server
2439  */
2440 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2441                          struct nfs_fsinfo *info)
2442 {
2443         int minor_version = server->nfs_client->cl_minorversion;
2444         int status = nfs4_lookup_root(server, fhandle, info);
2445         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2446                 /*
2447                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2448                  * by nfs4_map_errors() as this function exits.
2449                  */
2450                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2451         if (status == 0)
2452                 status = nfs4_server_capabilities(server, fhandle);
2453         if (status == 0)
2454                 status = nfs4_do_fsinfo(server, fhandle, info);
2455         return nfs4_map_errors(status);
2456 }
2457
2458 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2459                               struct nfs_fsinfo *info)
2460 {
2461         int error;
2462         struct nfs_fattr *fattr = info->fattr;
2463
2464         error = nfs4_server_capabilities(server, mntfh);
2465         if (error < 0) {
2466                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2467                 return error;
2468         }
2469
2470         error = nfs4_proc_getattr(server, mntfh, fattr);
2471         if (error < 0) {
2472                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2473                 return error;
2474         }
2475
2476         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2477             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2478                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2479
2480         return error;
2481 }
2482
2483 /*
2484  * Get locations and (maybe) other attributes of a referral.
2485  * Note that we'll actually follow the referral later when
2486  * we detect fsid mismatch in inode revalidation
2487  */
2488 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2489                              const struct qstr *name, struct nfs_fattr *fattr,
2490                              struct nfs_fh *fhandle)
2491 {
2492         int status = -ENOMEM;
2493         struct page *page = NULL;
2494         struct nfs4_fs_locations *locations = NULL;
2495
2496         page = alloc_page(GFP_KERNEL);
2497         if (page == NULL)
2498                 goto out;
2499         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2500         if (locations == NULL)
2501                 goto out;
2502
2503         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2504         if (status != 0)
2505                 goto out;
2506         /* Make sure server returned a different fsid for the referral */
2507         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2508                 dprintk("%s: server did not return a different fsid for"
2509                         " a referral at %s\n", __func__, name->name);
2510                 status = -EIO;
2511                 goto out;
2512         }
2513         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2514         nfs_fixup_referral_attributes(&locations->fattr);
2515
2516         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2517         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2518         memset(fhandle, 0, sizeof(struct nfs_fh));
2519 out:
2520         if (page)
2521                 __free_page(page);
2522         kfree(locations);
2523         return status;
2524 }
2525
2526 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2527 {
2528         struct nfs4_getattr_arg args = {
2529                 .fh = fhandle,
2530                 .bitmask = server->attr_bitmask,
2531         };
2532         struct nfs4_getattr_res res = {
2533                 .fattr = fattr,
2534                 .server = server,
2535         };
2536         struct rpc_message msg = {
2537                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2538                 .rpc_argp = &args,
2539                 .rpc_resp = &res,
2540         };
2541
2542         nfs_fattr_init(fattr);
2543         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2544 }
2545
2546 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2547 {
2548         struct nfs4_exception exception = { };
2549         int err;
2550         do {
2551                 err = nfs4_handle_exception(server,
2552                                 _nfs4_proc_getattr(server, fhandle, fattr),
2553                                 &exception);
2554         } while (exception.retry);
2555         return err;
2556 }
2557
2558 /*
2559  * The file is not closed if it is opened due to the a request to change
2560  * the size of the file. The open call will not be needed once the
2561  * VFS layer lookup-intents are implemented.
2562  *
2563  * Close is called when the inode is destroyed.
2564  * If we haven't opened the file for O_WRONLY, we
2565  * need to in the size_change case to obtain a stateid.
2566  *
2567  * Got race?
2568  * Because OPEN is always done by name in nfsv4, it is
2569  * possible that we opened a different file by the same
2570  * name.  We can recognize this race condition, but we
2571  * can't do anything about it besides returning an error.
2572  *
2573  * This will be fixed with VFS changes (lookup-intent).
2574  */
2575 static int
2576 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2577                   struct iattr *sattr)
2578 {
2579         struct inode *inode = dentry->d_inode;
2580         struct rpc_cred *cred = NULL;
2581         struct nfs4_state *state = NULL;
2582         int status;
2583
2584         if (pnfs_ld_layoutret_on_setattr(inode))
2585                 pnfs_return_layout(inode);
2586
2587         nfs_fattr_init(fattr);
2588
2589         /* Deal with open(O_TRUNC) */
2590         if (sattr->ia_valid & ATTR_OPEN)
2591                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2592
2593         /* Optimization: if the end result is no change, don't RPC */
2594         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2595                 return 0;
2596
2597         /* Search for an existing open(O_WRITE) file */
2598         if (sattr->ia_valid & ATTR_FILE) {
2599                 struct nfs_open_context *ctx;
2600
2601                 ctx = nfs_file_open_context(sattr->ia_file);
2602                 if (ctx) {
2603                         cred = ctx->cred;
2604                         state = ctx->state;
2605                 }
2606         }
2607
2608         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2609         if (status == 0)
2610                 nfs_setattr_update_inode(inode, sattr);
2611         return status;
2612 }
2613
2614 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2615                 const struct qstr *name, struct nfs_fh *fhandle,
2616                 struct nfs_fattr *fattr)
2617 {
2618         struct nfs_server *server = NFS_SERVER(dir);
2619         int                    status;
2620         struct nfs4_lookup_arg args = {
2621                 .bitmask = server->attr_bitmask,
2622                 .dir_fh = NFS_FH(dir),
2623                 .name = name,
2624         };
2625         struct nfs4_lookup_res res = {
2626                 .server = server,
2627                 .fattr = fattr,
2628                 .fh = fhandle,
2629         };
2630         struct rpc_message msg = {
2631                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2632                 .rpc_argp = &args,
2633                 .rpc_resp = &res,
2634         };
2635
2636         nfs_fattr_init(fattr);
2637
2638         dprintk("NFS call  lookup %s\n", name->name);
2639         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2640         dprintk("NFS reply lookup: %d\n", status);
2641         return status;
2642 }
2643
2644 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2645 {
2646         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2647                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2648         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2649         fattr->nlink = 2;
2650 }
2651
2652 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2653                                    struct qstr *name, struct nfs_fh *fhandle,
2654                                    struct nfs_fattr *fattr)
2655 {
2656         struct nfs4_exception exception = { };
2657         struct rpc_clnt *client = *clnt;
2658         int err;
2659         do {
2660                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2661                 switch (err) {
2662                 case -NFS4ERR_BADNAME:
2663                         err = -ENOENT;
2664                         goto out;
2665                 case -NFS4ERR_MOVED:
2666                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2667                         goto out;
2668                 case -NFS4ERR_WRONGSEC:
2669                         err = -EPERM;
2670                         if (client != *clnt)
2671                                 goto out;
2672
2673                         client = nfs4_create_sec_client(client, dir, name);
2674                         if (IS_ERR(client))
2675                                 return PTR_ERR(client);
2676
2677                         exception.retry = 1;
2678                         break;
2679                 default:
2680                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2681                 }
2682         } while (exception.retry);
2683
2684 out:
2685         if (err == 0)
2686                 *clnt = client;
2687         else if (client != *clnt)
2688                 rpc_shutdown_client(client);
2689
2690         return err;
2691 }
2692
2693 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2694                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2695 {
2696         int status;
2697         struct rpc_clnt *client = NFS_CLIENT(dir);
2698
2699         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2700         if (client != NFS_CLIENT(dir)) {
2701                 rpc_shutdown_client(client);
2702                 nfs_fixup_secinfo_attributes(fattr);
2703         }
2704         return status;
2705 }
2706
2707 struct rpc_clnt *
2708 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2709                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2710 {
2711         int status;
2712         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2713
2714         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2715         if (status < 0) {
2716                 rpc_shutdown_client(client);
2717                 return ERR_PTR(status);
2718         }
2719         return client;
2720 }
2721
2722 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2723 {
2724         struct nfs_server *server = NFS_SERVER(inode);
2725         struct nfs4_accessargs args = {
2726                 .fh = NFS_FH(inode),
2727                 .bitmask = server->cache_consistency_bitmask,
2728         };
2729         struct nfs4_accessres res = {
2730                 .server = server,
2731         };
2732         struct rpc_message msg = {
2733                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2734                 .rpc_argp = &args,
2735                 .rpc_resp = &res,
2736                 .rpc_cred = entry->cred,
2737         };
2738         int mode = entry->mask;
2739         int status;
2740
2741         /*
2742          * Determine which access bits we want to ask for...
2743          */
2744         if (mode & MAY_READ)
2745                 args.access |= NFS4_ACCESS_READ;
2746         if (S_ISDIR(inode->i_mode)) {
2747                 if (mode & MAY_WRITE)
2748                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2749                 if (mode & MAY_EXEC)
2750                         args.access |= NFS4_ACCESS_LOOKUP;
2751         } else {
2752                 if (mode & MAY_WRITE)
2753                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2754                 if (mode & MAY_EXEC)
2755                         args.access |= NFS4_ACCESS_EXECUTE;
2756         }
2757
2758         res.fattr = nfs_alloc_fattr();
2759         if (res.fattr == NULL)
2760                 return -ENOMEM;
2761
2762         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2763         if (!status) {
2764                 entry->mask = 0;
2765                 if (res.access & NFS4_ACCESS_READ)
2766                         entry->mask |= MAY_READ;
2767                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2768                         entry->mask |= MAY_WRITE;
2769                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2770                         entry->mask |= MAY_EXEC;
2771                 nfs_refresh_inode(inode, res.fattr);
2772         }
2773         nfs_free_fattr(res.fattr);
2774         return status;
2775 }
2776
2777 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2778 {
2779         struct nfs4_exception exception = { };
2780         int err;
2781         do {
2782                 err = nfs4_handle_exception(NFS_SERVER(inode),
2783                                 _nfs4_proc_access(inode, entry),
2784                                 &exception);
2785         } while (exception.retry);
2786         return err;
2787 }
2788
2789 /*
2790  * TODO: For the time being, we don't try to get any attributes
2791  * along with any of the zero-copy operations READ, READDIR,
2792  * READLINK, WRITE.
2793  *
2794  * In the case of the first three, we want to put the GETATTR
2795  * after the read-type operation -- this is because it is hard
2796  * to predict the length of a GETATTR response in v4, and thus
2797  * align the READ data correctly.  This means that the GETATTR
2798  * may end up partially falling into the page cache, and we should
2799  * shift it into the 'tail' of the xdr_buf before processing.
2800  * To do this efficiently, we need to know the total length
2801  * of data received, which doesn't seem to be available outside
2802  * of the RPC layer.
2803  *
2804  * In the case of WRITE, we also want to put the GETATTR after
2805  * the operation -- in this case because we want to make sure
2806  * we get the post-operation mtime and size.
2807  *
2808  * Both of these changes to the XDR layer would in fact be quite
2809  * minor, but I decided to leave them for a subsequent patch.
2810  */
2811 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2812                 unsigned int pgbase, unsigned int pglen)
2813 {
2814         struct nfs4_readlink args = {
2815                 .fh       = NFS_FH(inode),
2816                 .pgbase   = pgbase,
2817                 .pglen    = pglen,
2818                 .pages    = &page,
2819         };
2820         struct nfs4_readlink_res res;
2821         struct rpc_message msg = {
2822                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2823                 .rpc_argp = &args,
2824                 .rpc_resp = &res,
2825         };
2826
2827         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2828 }
2829
2830 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2831                 unsigned int pgbase, unsigned int pglen)
2832 {
2833         struct nfs4_exception exception = { };
2834         int err;
2835         do {
2836                 err = nfs4_handle_exception(NFS_SERVER(inode),
2837                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2838                                 &exception);
2839         } while (exception.retry);
2840         return err;
2841 }
2842
2843 /*
2844  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2845  */
2846 static int
2847 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2848                  int flags)
2849 {
2850         struct nfs_open_context *ctx;
2851         struct nfs4_state *state;
2852         int status = 0;
2853
2854         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2855         if (IS_ERR(ctx))
2856                 return PTR_ERR(ctx);
2857
2858         sattr->ia_mode &= ~current_umask();
2859         state = nfs4_do_open(dir, dentry, ctx->mode,
2860                         flags, sattr, ctx->cred,
2861                         &ctx->mdsthreshold);
2862         d_drop(dentry);
2863         if (IS_ERR(state)) {
2864                 status = PTR_ERR(state);
2865                 goto out;
2866         }
2867         d_add(dentry, igrab(state->inode));
2868         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2869         ctx->state = state;
2870 out:
2871         put_nfs_open_context(ctx);
2872         return status;
2873 }
2874
2875 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2876 {
2877         struct nfs_server *server = NFS_SERVER(dir);
2878         struct nfs_removeargs args = {
2879                 .fh = NFS_FH(dir),
2880                 .name = *name,
2881         };
2882         struct nfs_removeres res = {
2883                 .server = server,
2884         };
2885         struct rpc_message msg = {
2886                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2887                 .rpc_argp = &args,
2888                 .rpc_resp = &res,
2889         };
2890         int status;
2891
2892         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2893         if (status == 0)
2894                 update_changeattr(dir, &res.cinfo);
2895         return status;
2896 }
2897
2898 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2899 {
2900         struct nfs4_exception exception = { };
2901         int err;
2902         do {
2903                 err = nfs4_handle_exception(NFS_SERVER(dir),
2904                                 _nfs4_proc_remove(dir, name),
2905                                 &exception);
2906         } while (exception.retry);
2907         return err;
2908 }
2909
2910 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2911 {
2912         struct nfs_server *server = NFS_SERVER(dir);
2913         struct nfs_removeargs *args = msg->rpc_argp;
2914         struct nfs_removeres *res = msg->rpc_resp;
2915
2916         res->server = server;
2917         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2918         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2919 }
2920
2921 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2922 {
2923         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2924                                 &data->args.seq_args,
2925                                 &data->res.seq_res,
2926                                 task))
2927                 return;
2928         rpc_call_start(task);
2929 }
2930
2931 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2932 {
2933         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2934
2935         if (!nfs4_sequence_done(task, &res->seq_res))
2936                 return 0;
2937         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2938                 return 0;
2939         update_changeattr(dir, &res->cinfo);
2940         return 1;
2941 }
2942
2943 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2944 {
2945         struct nfs_server *server = NFS_SERVER(dir);
2946         struct nfs_renameargs *arg = msg->rpc_argp;
2947         struct nfs_renameres *res = msg->rpc_resp;
2948
2949         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2950         res->server = server;
2951         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2952 }
2953
2954 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2955 {
2956         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2957                                 &data->args.seq_args,
2958                                 &data->res.seq_res,
2959                                 task))
2960                 return;
2961         rpc_call_start(task);
2962 }
2963
2964 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2965                                  struct inode *new_dir)
2966 {
2967         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2968
2969         if (!nfs4_sequence_done(task, &res->seq_res))
2970                 return 0;
2971         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2972                 return 0;
2973
2974         update_changeattr(old_dir, &res->old_cinfo);
2975         update_changeattr(new_dir, &res->new_cinfo);
2976         return 1;
2977 }
2978
2979 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2980                 struct inode *new_dir, struct qstr *new_name)
2981 {
2982         struct nfs_server *server = NFS_SERVER(old_dir);
2983         struct nfs_renameargs arg = {
2984                 .old_dir = NFS_FH(old_dir),
2985                 .new_dir = NFS_FH(new_dir),
2986                 .old_name = old_name,
2987                 .new_name = new_name,
2988         };
2989         struct nfs_renameres res = {
2990                 .server = server,
2991         };
2992         struct rpc_message msg = {
2993                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2994                 .rpc_argp = &arg,
2995                 .rpc_resp = &res,
2996         };
2997         int status = -ENOMEM;
2998
2999         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3000         if (!status) {
3001                 update_changeattr(old_dir, &res.old_cinfo);
3002                 update_changeattr(new_dir, &res.new_cinfo);
3003         }
3004         return status;
3005 }
3006
3007 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3008                 struct inode *new_dir, struct qstr *new_name)
3009 {
3010         struct nfs4_exception exception = { };
3011         int err;
3012         do {
3013                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3014                                 _nfs4_proc_rename(old_dir, old_name,
3015                                         new_dir, new_name),
3016                                 &exception);
3017         } while (exception.retry);
3018         return err;
3019 }
3020
3021 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3022 {
3023         struct nfs_server *server = NFS_SERVER(inode);
3024         struct nfs4_link_arg arg = {
3025                 .fh     = NFS_FH(inode),
3026                 .dir_fh = NFS_FH(dir),
3027                 .name   = name,
3028                 .bitmask = server->attr_bitmask,
3029         };
3030         struct nfs4_link_res res = {
3031                 .server = server,
3032         };
3033         struct rpc_message msg = {
3034                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3035                 .rpc_argp = &arg,
3036                 .rpc_resp = &res,
3037         };
3038         int status = -ENOMEM;
3039
3040         res.fattr = nfs_alloc_fattr();
3041         if (res.fattr == NULL)
3042                 goto out;
3043
3044         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3045         if (!status) {
3046                 update_changeattr(dir, &res.cinfo);
3047                 nfs_post_op_update_inode(inode, res.fattr);
3048         }
3049 out:
3050         nfs_free_fattr(res.fattr);
3051         return status;
3052 }
3053
3054 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3055 {
3056         struct nfs4_exception exception = { };
3057         int err;
3058         do {
3059                 err = nfs4_handle_exception(NFS_SERVER(inode),
3060                                 _nfs4_proc_link(inode, dir, name),
3061                                 &exception);
3062         } while (exception.retry);
3063         return err;
3064 }
3065
3066 struct nfs4_createdata {
3067         struct rpc_message msg;
3068         struct nfs4_create_arg arg;
3069         struct nfs4_create_res res;
3070         struct nfs_fh fh;
3071         struct nfs_fattr fattr;
3072 };
3073
3074 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3075                 struct qstr *name, struct iattr *sattr, u32 ftype)
3076 {
3077         struct nfs4_createdata *data;
3078
3079         data = kzalloc(sizeof(*data), GFP_KERNEL);
3080         if (data != NULL) {
3081                 struct nfs_server *server = NFS_SERVER(dir);
3082
3083                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3084                 data->msg.rpc_argp = &data->arg;
3085                 data->msg.rpc_resp = &data->res;
3086                 data->arg.dir_fh = NFS_FH(dir);
3087                 data->arg.server = server;
3088                 data->arg.name = name;
3089                 data->arg.attrs = sattr;
3090                 data->arg.ftype = ftype;
3091                 data->arg.bitmask = server->attr_bitmask;
3092                 data->res.server = server;
3093                 data->res.fh = &data->fh;
3094                 data->res.fattr = &data->fattr;
3095                 nfs_fattr_init(data->res.fattr);
3096         }
3097         return data;
3098 }
3099
3100 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3101 {
3102         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3103                                     &data->arg.seq_args, &data->res.seq_res, 1);
3104         if (status == 0) {
3105                 update_changeattr(dir, &data->res.dir_cinfo);
3106                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3107         }
3108         return status;
3109 }
3110
3111 static void nfs4_free_createdata(struct nfs4_createdata *data)
3112 {
3113         kfree(data);
3114 }
3115
3116 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3117                 struct page *page, unsigned int len, struct iattr *sattr)
3118 {
3119         struct nfs4_createdata *data;
3120         int status = -ENAMETOOLONG;
3121
3122         if (len > NFS4_MAXPATHLEN)
3123                 goto out;
3124
3125         status = -ENOMEM;
3126         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3127         if (data == NULL)
3128                 goto out;
3129
3130         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3131         data->arg.u.symlink.pages = &page;
3132         data->arg.u.symlink.len = len;
3133
3134         status = nfs4_do_create(dir, dentry, data);
3135
3136         nfs4_free_createdata(data);
3137 out:
3138         return status;
3139 }
3140
3141 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3142                 struct page *page, unsigned int len, struct iattr *sattr)
3143 {
3144         struct nfs4_exception exception = { };
3145         int err;
3146         do {
3147                 err = nfs4_handle_exception(NFS_SERVER(dir),
3148                                 _nfs4_proc_symlink(dir, dentry, page,
3149                                                         len, sattr),
3150                                 &exception);
3151         } while (exception.retry);
3152         return err;
3153 }
3154
3155 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3156                 struct iattr *sattr)
3157 {
3158         struct nfs4_createdata *data;
3159         int status = -ENOMEM;
3160
3161         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3162         if (data == NULL)
3163                 goto out;
3164
3165         status = nfs4_do_create(dir, dentry, data);
3166
3167         nfs4_free_createdata(data);
3168 out:
3169         return status;
3170 }
3171
3172 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3173                 struct iattr *sattr)
3174 {
3175         struct nfs4_exception exception = { };
3176         int err;
3177
3178         sattr->ia_mode &= ~current_umask();
3179         do {
3180                 err = nfs4_handle_exception(NFS_SERVER(dir),
3181                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3182                                 &exception);
3183         } while (exception.retry);
3184         return err;
3185 }
3186
3187 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3188                 u64 cookie, struct page **pages, unsigned int count, int plus)
3189 {
3190         struct inode            *dir = dentry->d_inode;
3191         struct nfs4_readdir_arg args = {
3192                 .fh = NFS_FH(dir),
3193                 .pages = pages,
3194                 .pgbase = 0,
3195                 .count = count,
3196                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3197                 .plus = plus,
3198         };
3199         struct nfs4_readdir_res res;
3200         struct rpc_message msg = {
3201                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3202                 .rpc_argp = &args,
3203                 .rpc_resp = &res,
3204                 .rpc_cred = cred,
3205         };
3206         int                     status;
3207
3208         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3209                         dentry->d_parent->d_name.name,
3210                         dentry->d_name.name,
3211                         (unsigned long long)cookie);
3212         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3213         res.pgbase = args.pgbase;
3214         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3215         if (status >= 0) {
3216                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3217                 status += args.pgbase;
3218         }
3219
3220         nfs_invalidate_atime(dir);
3221
3222         dprintk("%s: returns %d\n", __func__, status);
3223         return status;
3224 }
3225
3226 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3227                 u64 cookie, struct page **pages, unsigned int count, int plus)
3228 {
3229         struct nfs4_exception exception = { };
3230         int err;
3231         do {
3232                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3233                                 _nfs4_proc_readdir(dentry, cred, cookie,
3234                                         pages, count, plus),
3235                                 &exception);
3236         } while (exception.retry);
3237         return err;
3238 }
3239
3240 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3241                 struct iattr *sattr, dev_t rdev)
3242 {
3243         struct nfs4_createdata *data;
3244         int mode = sattr->ia_mode;
3245         int status = -ENOMEM;
3246
3247         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3248         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3249
3250         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3251         if (data == NULL)
3252                 goto out;
3253
3254         if (S_ISFIFO(mode))
3255                 data->arg.ftype = NF4FIFO;
3256         else if (S_ISBLK(mode)) {
3257                 data->arg.ftype = NF4BLK;
3258                 data->arg.u.device.specdata1 = MAJOR(rdev);
3259                 data->arg.u.device.specdata2 = MINOR(rdev);
3260         }
3261         else if (S_ISCHR(mode)) {
3262                 data->arg.ftype = NF4CHR;
3263                 data->arg.u.device.specdata1 = MAJOR(rdev);
3264                 data->arg.u.device.specdata2 = MINOR(rdev);
3265         }
3266
3267         status = nfs4_do_create(dir, dentry, data);
3268
3269         nfs4_free_createdata(data);
3270 out:
3271         return status;
3272 }
3273
3274 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3275                 struct iattr *sattr, dev_t rdev)
3276 {
3277         struct nfs4_exception exception = { };
3278         int err;
3279
3280         sattr->ia_mode &= ~current_umask();
3281         do {
3282                 err = nfs4_handle_exception(NFS_SERVER(dir),
3283                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3284                                 &exception);
3285         } while (exception.retry);
3286         return err;
3287 }
3288
3289 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3290                  struct nfs_fsstat *fsstat)
3291 {
3292         struct nfs4_statfs_arg args = {
3293                 .fh = fhandle,
3294                 .bitmask = server->attr_bitmask,
3295         };
3296         struct nfs4_statfs_res res = {
3297                 .fsstat = fsstat,
3298         };
3299         struct rpc_message msg = {
3300                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3301                 .rpc_argp = &args,
3302                 .rpc_resp = &res,
3303         };
3304
3305         nfs_fattr_init(fsstat->fattr);
3306         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3307 }
3308
3309 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3310 {
3311         struct nfs4_exception exception = { };
3312         int err;
3313         do {
3314                 err = nfs4_handle_exception(server,
3315                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3316                                 &exception);
3317         } while (exception.retry);
3318         return err;
3319 }
3320
3321 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3322                 struct nfs_fsinfo *fsinfo)
3323 {
3324         struct nfs4_fsinfo_arg args = {
3325                 .fh = fhandle,
3326                 .bitmask = server->attr_bitmask,
3327         };
3328         struct nfs4_fsinfo_res res = {
3329                 .fsinfo = fsinfo,
3330         };
3331         struct rpc_message msg = {
3332                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3333                 .rpc_argp = &args,
3334                 .rpc_resp = &res,
3335         };
3336
3337         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3338 }
3339
3340 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3341 {
3342         struct nfs4_exception exception = { };
3343         int err;
3344
3345         do {
3346                 err = nfs4_handle_exception(server,
3347                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3348                                 &exception);
3349         } while (exception.retry);
3350         return err;
3351 }
3352
3353 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3354 {
3355         int error;
3356
3357         nfs_fattr_init(fsinfo->fattr);
3358         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3359         if (error == 0)
3360                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3361
3362         return error;
3363 }
3364
3365 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3366                 struct nfs_pathconf *pathconf)
3367 {
3368         struct nfs4_pathconf_arg args = {
3369                 .fh = fhandle,
3370                 .bitmask = server->attr_bitmask,
3371         };
3372         struct nfs4_pathconf_res res = {
3373                 .pathconf = pathconf,
3374         };
3375         struct rpc_message msg = {
3376                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3377                 .rpc_argp = &args,
3378                 .rpc_resp = &res,
3379         };
3380
3381         /* None of the pathconf attributes are mandatory to implement */
3382         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3383                 memset(pathconf, 0, sizeof(*pathconf));
3384                 return 0;
3385         }
3386
3387         nfs_fattr_init(pathconf->fattr);
3388         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3389 }
3390
3391 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3392                 struct nfs_pathconf *pathconf)
3393 {
3394         struct nfs4_exception exception = { };
3395         int err;
3396
3397         do {
3398                 err = nfs4_handle_exception(server,
3399                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3400                                 &exception);
3401         } while (exception.retry);
3402         return err;
3403 }
3404
3405 void __nfs4_read_done_cb(struct nfs_read_data *data)
3406 {
3407         nfs_invalidate_atime(data->header->inode);
3408 }
3409
3410 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3411 {
3412         struct nfs_server *server = NFS_SERVER(data->header->inode);
3413
3414         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3415                 rpc_restart_call_prepare(task);
3416                 return -EAGAIN;
3417         }
3418
3419         __nfs4_read_done_cb(data);
3420         if (task->tk_status > 0)
3421                 renew_lease(server, data->timestamp);
3422         return 0;
3423 }
3424
3425 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3426 {
3427
3428         dprintk("--> %s\n", __func__);
3429
3430         if (!nfs4_sequence_done(task, &data->res.seq_res))
3431                 return -EAGAIN;
3432
3433         return data->read_done_cb ? data->read_done_cb(task, data) :
3434                                     nfs4_read_done_cb(task, data);
3435 }
3436
3437 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3438 {
3439         data->timestamp   = jiffies;
3440         data->read_done_cb = nfs4_read_done_cb;
3441         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3442         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3443 }
3444
3445 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3446 {
3447         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3448                                 &data->args.seq_args,
3449                                 &data->res.seq_res,
3450                                 task))
3451                 return;
3452         rpc_call_start(task);
3453 }
3454
3455 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3456 {
3457         struct inode *inode = data->header->inode;
3458
3459         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3460                 rpc_restart_call_prepare(task);
3461                 return -EAGAIN;
3462         }
3463         if (task->tk_status >= 0) {
3464                 renew_lease(NFS_SERVER(inode), data->timestamp);
3465                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3466         }
3467         return 0;
3468 }
3469
3470 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3471 {
3472         if (!nfs4_sequence_done(task, &data->res.seq_res))
3473                 return -EAGAIN;
3474         return data->write_done_cb ? data->write_done_cb(task, data) :
3475                 nfs4_write_done_cb(task, data);
3476 }
3477
3478 static
3479 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3480 {
3481         const struct nfs_pgio_header *hdr = data->header;
3482
3483         /* Don't request attributes for pNFS or O_DIRECT writes */
3484         if (data->ds_clp != NULL || hdr->dreq != NULL)
3485                 return false;
3486         /* Otherwise, request attributes if and only if we don't hold
3487          * a delegation
3488          */
3489         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3490 }
3491
3492 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3493 {
3494         struct nfs_server *server = NFS_SERVER(data->header->inode);
3495
3496         if (!nfs4_write_need_cache_consistency_data(data)) {
3497                 data->args.bitmask = NULL;
3498                 data->res.fattr = NULL;
3499         } else
3500                 data->args.bitmask = server->cache_consistency_bitmask;
3501
3502         if (!data->write_done_cb)
3503                 data->write_done_cb = nfs4_write_done_cb;
3504         data->res.server = server;
3505         data->timestamp   = jiffies;
3506
3507         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3508         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3509 }
3510
3511 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3512 {
3513         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3514                                 &data->args.seq_args,
3515                                 &data->res.seq_res,
3516                                 task))
3517                 return;
3518         rpc_call_start(task);
3519 }
3520
3521 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3522 {
3523         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3524                                 &data->args.seq_args,
3525                                 &data->res.seq_res,
3526                                 task))
3527                 return;
3528         rpc_call_start(task);
3529 }
3530
3531 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3532 {
3533         struct inode *inode = data->inode;
3534
3535         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3536                 rpc_restart_call_prepare(task);
3537                 return -EAGAIN;
3538         }
3539         return 0;
3540 }
3541
3542 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3543 {
3544         if (!nfs4_sequence_done(task, &data->res.seq_res))
3545                 return -EAGAIN;
3546         return data->commit_done_cb(task, data);
3547 }
3548
3549 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3550 {
3551         struct nfs_server *server = NFS_SERVER(data->inode);
3552
3553         if (data->commit_done_cb == NULL)
3554                 data->commit_done_cb = nfs4_commit_done_cb;
3555         data->res.server = server;
3556         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3557         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3558 }
3559
3560 struct nfs4_renewdata {
3561         struct nfs_client       *client;
3562         unsigned long           timestamp;
3563 };
3564
3565 /*
3566  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3567  * standalone procedure for queueing an asynchronous RENEW.
3568  */
3569 static void nfs4_renew_release(void *calldata)
3570 {
3571         struct nfs4_renewdata *data = calldata;
3572         struct nfs_client *clp = data->client;
3573
3574         if (atomic_read(&clp->cl_count) > 1)
3575                 nfs4_schedule_state_renewal(clp);
3576         nfs_put_client(clp);
3577         kfree(data);
3578 }
3579
3580 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3581 {
3582         struct nfs4_renewdata *data = calldata;
3583         struct nfs_client *clp = data->client;
3584         unsigned long timestamp = data->timestamp;
3585
3586         if (task->tk_status < 0) {
3587                 /* Unless we're shutting down, schedule state recovery! */
3588                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3589                         return;
3590                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3591                         nfs4_schedule_lease_recovery(clp);
3592                         return;
3593                 }
3594                 nfs4_schedule_path_down_recovery(clp);
3595         }
3596         do_renew_lease(clp, timestamp);
3597 }
3598
3599 static const struct rpc_call_ops nfs4_renew_ops = {
3600         .rpc_call_done = nfs4_renew_done,
3601         .rpc_release = nfs4_renew_release,
3602 };
3603
3604 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3605 {
3606         struct rpc_message msg = {
3607                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3608                 .rpc_argp       = clp,
3609                 .rpc_cred       = cred,
3610         };
3611         struct nfs4_renewdata *data;
3612
3613         if (renew_flags == 0)
3614                 return 0;
3615         if (!atomic_inc_not_zero(&clp->cl_count))
3616                 return -EIO;
3617         data = kmalloc(sizeof(*data), GFP_NOFS);
3618         if (data == NULL)
3619                 return -ENOMEM;
3620         data->client = clp;
3621         data->timestamp = jiffies;
3622         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3623                         &nfs4_renew_ops, data);
3624 }
3625
3626 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3627 {
3628         struct rpc_message msg = {
3629                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3630                 .rpc_argp       = clp,
3631                 .rpc_cred       = cred,
3632         };
3633         unsigned long now = jiffies;
3634         int status;
3635
3636         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3637         if (status < 0)
3638                 return status;
3639         do_renew_lease(clp, now);
3640         return 0;
3641 }
3642
3643 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3644 {
3645         return (server->caps & NFS_CAP_ACLS)
3646                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3647                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3648 }
3649
3650 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3651  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3652  * the stack.
3653  */
3654 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3655
3656 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3657                 struct page **pages, unsigned int *pgbase)
3658 {
3659         struct page *newpage, **spages;
3660         int rc = 0;
3661         size_t len;
3662         spages = pages;
3663
3664         do {
3665                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3666                 newpage = alloc_page(GFP_KERNEL);
3667
3668                 if (newpage == NULL)
3669                         goto unwind;
3670                 memcpy(page_address(newpage), buf, len);
3671                 buf += len;
3672                 buflen -= len;
3673                 *pages++ = newpage;
3674                 rc++;
3675         } while (buflen != 0);
3676
3677         return rc;
3678
3679 unwind:
3680         for(; rc > 0; rc--)
3681                 __free_page(spages[rc-1]);
3682         return -ENOMEM;
3683 }
3684
3685 struct nfs4_cached_acl {
3686         int cached;
3687         size_t len;
3688         char data[0];
3689 };
3690
3691 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3692 {
3693         struct nfs_inode *nfsi = NFS_I(inode);
3694
3695         spin_lock(&inode->i_lock);
3696         kfree(nfsi->nfs4_acl);
3697         nfsi->nfs4_acl = acl;
3698         spin_unlock(&inode->i_lock);
3699 }
3700
3701 static void nfs4_zap_acl_attr(struct inode *inode)
3702 {
3703         nfs4_set_cached_acl(inode, NULL);
3704 }
3705
3706 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3707 {
3708         struct nfs_inode *nfsi = NFS_I(inode);
3709         struct nfs4_cached_acl *acl;
3710         int ret = -ENOENT;
3711
3712         spin_lock(&inode->i_lock);
3713         acl = nfsi->nfs4_acl;
3714         if (acl == NULL)
3715                 goto out;
3716         if (buf == NULL) /* user is just asking for length */
3717                 goto out_len;
3718         if (acl->cached == 0)
3719                 goto out;
3720         ret = -ERANGE; /* see getxattr(2) man page */
3721         if (acl->len > buflen)
3722                 goto out;
3723         memcpy(buf, acl->data, acl->len);
3724 out_len:
3725         ret = acl->len;
3726 out:
3727         spin_unlock(&inode->i_lock);
3728         return ret;
3729 }
3730
3731 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3732 {
3733         struct nfs4_cached_acl *acl;
3734
3735         if (pages && acl_len <= PAGE_SIZE) {
3736                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3737                 if (acl == NULL)
3738                         goto out;
3739                 acl->cached = 1;
3740                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3741         } else {
3742                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3743                 if (acl == NULL)
3744                         goto out;
3745                 acl->cached = 0;
3746         }
3747         acl->len = acl_len;
3748 out:
3749         nfs4_set_cached_acl(inode, acl);
3750 }
3751
3752 /*
3753  * The getxattr API returns the required buffer length when called with a
3754  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3755  * the required buf.  On a NULL buf, we send a page of data to the server
3756  * guessing that the ACL request can be serviced by a page. If so, we cache
3757  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3758  * the cache. If not so, we throw away the page, and cache the required
3759  * length. The next getxattr call will then produce another round trip to
3760  * the server, this time with the input buf of the required size.
3761  */
3762 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3763 {
3764         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3765         struct nfs_getaclargs args = {
3766                 .fh = NFS_FH(inode),
3767                 .acl_pages = pages,
3768                 .acl_len = buflen,
3769         };
3770         struct nfs_getaclres res = {
3771                 .acl_len = buflen,
3772         };
3773         struct rpc_message msg = {
3774                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3775                 .rpc_argp = &args,
3776                 .rpc_resp = &res,
3777         };
3778         int ret = -ENOMEM, npages, i, acl_len = 0;
3779
3780         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3781         /* As long as we're doing a round trip to the server anyway,
3782          * let's be prepared for a page of acl data. */
3783         if (npages == 0)
3784                 npages = 1;
3785
3786         /* Add an extra page to handle the bitmap returned */
3787         npages++;
3788
3789         for (i = 0; i < npages; i++) {
3790                 pages[i] = alloc_page(GFP_KERNEL);
3791                 if (!pages[i])
3792                         goto out_free;
3793         }
3794
3795         /* for decoding across pages */
3796         res.acl_scratch = alloc_page(GFP_KERNEL);
3797         if (!res.acl_scratch)
3798                 goto out_free;
3799
3800         args.acl_len = npages * PAGE_SIZE;
3801         args.acl_pgbase = 0;
3802
3803         /* Let decode_getfacl know not to fail if the ACL data is larger than
3804          * the page we send as a guess */
3805         if (buf == NULL)
3806                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3807
3808         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3809                 __func__, buf, buflen, npages, args.acl_len);
3810         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3811                              &msg, &args.seq_args, &res.seq_res, 0);
3812         if (ret)
3813                 goto out_free;
3814
3815         acl_len = res.acl_len - res.acl_data_offset;
3816         if (acl_len > args.acl_len)
3817                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3818         else
3819                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3820                                       acl_len);
3821         if (buf) {
3822                 ret = -ERANGE;
3823                 if (acl_len > buflen)
3824                         goto out_free;
3825                 _copy_from_pages(buf, pages, res.acl_data_offset,
3826                                 acl_len);
3827         }
3828         ret = acl_len;
3829 out_free:
3830         for (i = 0; i < npages; i++)
3831                 if (pages[i])
3832                         __free_page(pages[i]);
3833         if (res.acl_scratch)
3834                 __free_page(res.acl_scratch);
3835         return ret;
3836 }
3837
3838 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3839 {
3840         struct nfs4_exception exception = { };
3841         ssize_t ret;
3842         do {
3843                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3844                 if (ret >= 0)
3845                         break;
3846                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3847         } while (exception.retry);
3848         return ret;
3849 }
3850
3851 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3852 {
3853         struct nfs_server *server = NFS_SERVER(inode);
3854         int ret;
3855
3856         if (!nfs4_server_supports_acls(server))
3857                 return -EOPNOTSUPP;
3858         ret = nfs_revalidate_inode(server, inode);
3859         if (ret < 0)
3860                 return ret;
3861         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3862                 nfs_zap_acl_cache(inode);
3863         ret = nfs4_read_cached_acl(inode, buf, buflen);
3864         if (ret != -ENOENT)
3865                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3866                  * but no cached acl data, just the acl length */
3867                 return ret;
3868         return nfs4_get_acl_uncached(inode, buf, buflen);
3869 }
3870
3871 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3872 {
3873         struct nfs_server *server = NFS_SERVER(inode);
3874         struct page *pages[NFS4ACL_MAXPAGES];
3875         struct nfs_setaclargs arg = {
3876                 .fh             = NFS_FH(inode),
3877                 .acl_pages      = pages,
3878                 .acl_len        = buflen,
3879         };
3880         struct nfs_setaclres res;
3881         struct rpc_message msg = {
3882                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3883                 .rpc_argp       = &arg,
3884                 .rpc_resp       = &res,
3885         };
3886         int ret, i;
3887
3888         if (!nfs4_server_supports_acls(server))
3889                 return -EOPNOTSUPP;
3890         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3891         if (i < 0)
3892                 return i;
3893         nfs4_inode_return_delegation(inode);
3894         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3895
3896         /*
3897          * Free each page after tx, so the only ref left is
3898          * held by the network stack
3899          */
3900         for (; i > 0; i--)
3901                 put_page(pages[i-1]);
3902
3903         /*
3904          * Acl update can result in inode attribute update.
3905          * so mark the attribute cache invalid.
3906          */
3907         spin_lock(&inode->i_lock);
3908         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3909         spin_unlock(&inode->i_lock);
3910         nfs_access_zap_cache(inode);
3911         nfs_zap_acl_cache(inode);
3912         return ret;
3913 }
3914
3915 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3916 {
3917         struct nfs4_exception exception = { };
3918         int err;
3919         do {
3920                 err = nfs4_handle_exception(NFS_SERVER(inode),
3921                                 __nfs4_proc_set_acl(inode, buf, buflen),
3922                                 &exception);
3923         } while (exception.retry);
3924         return err;
3925 }
3926
3927 static int
3928 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3929 {
3930         struct nfs_client *clp = server->nfs_client;
3931
3932         if (task->tk_status >= 0)
3933                 return 0;
3934         switch(task->tk_status) {
3935                 case -NFS4ERR_DELEG_REVOKED:
3936                 case -NFS4ERR_ADMIN_REVOKED:
3937                 case -NFS4ERR_BAD_STATEID:
3938                         if (state == NULL)
3939                                 break;
3940                         nfs_remove_bad_delegation(state->inode);
3941                 case -NFS4ERR_OPENMODE:
3942                         if (state == NULL)
3943                                 break;
3944                         nfs4_schedule_stateid_recovery(server, state);
3945                         goto wait_on_recovery;
3946                 case -NFS4ERR_EXPIRED:
3947                         if (state != NULL)
3948                                 nfs4_schedule_stateid_recovery(server, state);
3949                 case -NFS4ERR_STALE_STATEID:
3950                 case -NFS4ERR_STALE_CLIENTID:
3951                         nfs4_schedule_lease_recovery(clp);
3952                         goto wait_on_recovery;
3953 #if defined(CONFIG_NFS_V4_1)
3954                 case -NFS4ERR_BADSESSION:
3955                 case -NFS4ERR_BADSLOT:
3956                 case -NFS4ERR_BAD_HIGH_SLOT:
3957                 case -NFS4ERR_DEADSESSION:
3958                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3959                 case -NFS4ERR_SEQ_FALSE_RETRY:
3960                 case -NFS4ERR_SEQ_MISORDERED:
3961                         dprintk("%s ERROR %d, Reset session\n", __func__,
3962                                 task->tk_status);
3963                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3964                         task->tk_status = 0;
3965                         return -EAGAIN;
3966 #endif /* CONFIG_NFS_V4_1 */
3967                 case -NFS4ERR_DELAY:
3968                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3969                 case -NFS4ERR_GRACE:
3970                 case -EKEYEXPIRED:
3971                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3972                         task->tk_status = 0;
3973                         return -EAGAIN;
3974                 case -NFS4ERR_RETRY_UNCACHED_REP:
3975                 case -NFS4ERR_OLD_STATEID:
3976                         task->tk_status = 0;
3977                         return -EAGAIN;
3978         }
3979         task->tk_status = nfs4_map_errors(task->tk_status);
3980         return 0;
3981 wait_on_recovery:
3982         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3983         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3984                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3985         task->tk_status = 0;
3986         return -EAGAIN;
3987 }
3988
3989 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3990                                     nfs4_verifier *bootverf)
3991 {
3992         __be32 verf[2];
3993
3994         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3995                 /* An impossible timestamp guarantees this value
3996                  * will never match a generated boot time. */
3997                 verf[0] = 0;
3998                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3999         } else {
4000                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4001                 verf[0] = (__be32)nn->boot_time.tv_sec;
4002                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4003         }
4004         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4005 }
4006
4007 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4008                 unsigned short port, struct rpc_cred *cred,
4009                 struct nfs4_setclientid_res *res)
4010 {
4011         nfs4_verifier sc_verifier;
4012         struct nfs4_setclientid setclientid = {
4013                 .sc_verifier = &sc_verifier,
4014                 .sc_prog = program,
4015                 .sc_cb_ident = clp->cl_cb_ident,
4016         };
4017         struct rpc_message msg = {
4018                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4019                 .rpc_argp = &setclientid,
4020                 .rpc_resp = res,
4021                 .rpc_cred = cred,
4022         };
4023         int loop = 0;
4024         int status;
4025
4026         nfs4_init_boot_verifier(clp, &sc_verifier);
4027
4028         for(;;) {
4029                 rcu_read_lock();
4030                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
4031                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
4032                                 clp->cl_ipaddr,
4033                                 rpc_peeraddr2str(clp->cl_rpcclient,
4034                                                         RPC_DISPLAY_ADDR),
4035                                 rpc_peeraddr2str(clp->cl_rpcclient,
4036                                                         RPC_DISPLAY_PROTO),
4037                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4038                                 clp->cl_id_uniquifier);
4039                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4040                                 sizeof(setclientid.sc_netid),
4041                                 rpc_peeraddr2str(clp->cl_rpcclient,
4042                                                         RPC_DISPLAY_NETID));
4043                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4044                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4045                                 clp->cl_ipaddr, port >> 8, port & 255);
4046                 rcu_read_unlock();
4047
4048                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4049                 if (status != -NFS4ERR_CLID_INUSE)
4050                         break;
4051                 if (loop != 0) {
4052                         ++clp->cl_id_uniquifier;
4053                         break;
4054                 }
4055                 ++loop;
4056                 ssleep(clp->cl_lease_time / HZ + 1);
4057         }
4058         return status;
4059 }
4060
4061 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4062                 struct nfs4_setclientid_res *arg,
4063                 struct rpc_cred *cred)
4064 {
4065         struct nfs_fsinfo fsinfo;
4066         struct rpc_message msg = {
4067                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4068                 .rpc_argp = arg,
4069                 .rpc_resp = &fsinfo,
4070                 .rpc_cred = cred,
4071         };
4072         unsigned long now;
4073         int status;
4074
4075         now = jiffies;
4076         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4077         if (status == 0) {
4078                 spin_lock(&clp->cl_lock);
4079                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4080                 clp->cl_last_renewal = now;
4081                 spin_unlock(&clp->cl_lock);
4082         }
4083         return status;
4084 }
4085
4086 struct nfs4_delegreturndata {
4087         struct nfs4_delegreturnargs args;
4088         struct nfs4_delegreturnres res;
4089         struct nfs_fh fh;
4090         nfs4_stateid stateid;
4091         unsigned long timestamp;
4092         struct nfs_fattr fattr;
4093         int rpc_status;
4094 };
4095
4096 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4097 {
4098         struct nfs4_delegreturndata *data = calldata;
4099
4100         if (!nfs4_sequence_done(task, &data->res.seq_res))
4101                 return;
4102
4103         switch (task->tk_status) {
4104         case -NFS4ERR_STALE_STATEID:
4105         case -NFS4ERR_EXPIRED:
4106         case 0:
4107                 renew_lease(data->res.server, data->timestamp);
4108                 break;
4109         default:
4110                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4111                                 -EAGAIN) {
4112                         rpc_restart_call_prepare(task);
4113                         return;
4114                 }
4115         }
4116         data->rpc_status = task->tk_status;
4117 }
4118
4119 static void nfs4_delegreturn_release(void *calldata)
4120 {
4121         kfree(calldata);
4122 }
4123
4124 #if defined(CONFIG_NFS_V4_1)
4125 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4126 {
4127         struct nfs4_delegreturndata *d_data;
4128
4129         d_data = (struct nfs4_delegreturndata *)data;
4130
4131         if (nfs4_setup_sequence(d_data->res.server,
4132                                 &d_data->args.seq_args,
4133                                 &d_data->res.seq_res, task))
4134                 return;
4135         rpc_call_start(task);
4136 }
4137 #endif /* CONFIG_NFS_V4_1 */
4138
4139 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4140 #if defined(CONFIG_NFS_V4_1)
4141         .rpc_call_prepare = nfs4_delegreturn_prepare,
4142 #endif /* CONFIG_NFS_V4_1 */
4143         .rpc_call_done = nfs4_delegreturn_done,
4144         .rpc_release = nfs4_delegreturn_release,
4145 };
4146
4147 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4148 {
4149         struct nfs4_delegreturndata *data;
4150         struct nfs_server *server = NFS_SERVER(inode);
4151         struct rpc_task *task;
4152         struct rpc_message msg = {
4153                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4154                 .rpc_cred = cred,
4155         };
4156         struct rpc_task_setup task_setup_data = {
4157                 .rpc_client = server->client,
4158                 .rpc_message = &msg,
4159                 .callback_ops = &nfs4_delegreturn_ops,
4160                 .flags = RPC_TASK_ASYNC,
4161         };
4162         int status = 0;
4163
4164         data = kzalloc(sizeof(*data), GFP_NOFS);
4165         if (data == NULL)
4166                 return -ENOMEM;
4167         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4168         data->args.fhandle = &data->fh;
4169         data->args.stateid = &data->stateid;
4170         data->args.bitmask = server->cache_consistency_bitmask;
4171         nfs_copy_fh(&data->fh, NFS_FH(inode));
4172         nfs4_stateid_copy(&data->stateid, stateid);
4173         data->res.fattr = &data->fattr;
4174         data->res.server = server;
4175         nfs_fattr_init(data->res.fattr);
4176         data->timestamp = jiffies;
4177         data->rpc_status = 0;
4178
4179         task_setup_data.callback_data = data;
4180         msg.rpc_argp = &data->args;
4181         msg.rpc_resp = &data->res;
4182         task = rpc_run_task(&task_setup_data);
4183         if (IS_ERR(task))
4184                 return PTR_ERR(task);
4185         if (!issync)
4186                 goto out;
4187         status = nfs4_wait_for_completion_rpc_task(task);
4188         if (status != 0)
4189                 goto out;
4190         status = data->rpc_status;
4191         if (status == 0)
4192                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4193         else
4194                 nfs_refresh_inode(inode, &data->fattr);
4195 out:
4196         rpc_put_task(task);
4197         return status;
4198 }
4199
4200 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4201 {
4202         struct nfs_server *server = NFS_SERVER(inode);
4203         struct nfs4_exception exception = { };
4204         int err;
4205         do {
4206                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4207                 switch (err) {
4208                         case -NFS4ERR_STALE_STATEID:
4209                         case -NFS4ERR_EXPIRED:
4210                         case 0:
4211                                 return 0;
4212                 }
4213                 err = nfs4_handle_exception(server, err, &exception);
4214         } while (exception.retry);
4215         return err;
4216 }
4217
4218 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4219 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4220
4221 /*
4222  * sleep, with exponential backoff, and retry the LOCK operation.
4223  */
4224 static unsigned long
4225 nfs4_set_lock_task_retry(unsigned long timeout)
4226 {
4227         freezable_schedule_timeout_killable(timeout);
4228         timeout <<= 1;
4229         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4230                 return NFS4_LOCK_MAXTIMEOUT;
4231         return timeout;
4232 }
4233
4234 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4235 {
4236         struct inode *inode = state->inode;
4237         struct nfs_server *server = NFS_SERVER(inode);
4238         struct nfs_client *clp = server->nfs_client;
4239         struct nfs_lockt_args arg = {
4240                 .fh = NFS_FH(inode),
4241                 .fl = request,
4242         };
4243         struct nfs_lockt_res res = {
4244                 .denied = request,
4245         };
4246         struct rpc_message msg = {
4247                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4248                 .rpc_argp       = &arg,
4249                 .rpc_resp       = &res,
4250                 .rpc_cred       = state->owner->so_cred,
4251         };
4252         struct nfs4_lock_state *lsp;
4253         int status;
4254
4255         arg.lock_owner.clientid = clp->cl_clientid;
4256         status = nfs4_set_lock_state(state, request);
4257         if (status != 0)
4258                 goto out;
4259         lsp = request->fl_u.nfs4_fl.owner;
4260         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4261         arg.lock_owner.s_dev = server->s_dev;
4262         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4263         switch (status) {
4264                 case 0:
4265                         request->fl_type = F_UNLCK;
4266                         break;
4267                 case -NFS4ERR_DENIED:
4268                         status = 0;
4269         }
4270         request->fl_ops->fl_release_private(request);
4271 out:
4272         return status;
4273 }
4274
4275 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4276 {
4277         struct nfs4_exception exception = { };
4278         int err;
4279
4280         do {
4281                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4282                                 _nfs4_proc_getlk(state, cmd, request),
4283                                 &exception);
4284         } while (exception.retry);
4285         return err;
4286 }
4287
4288 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4289 {
4290         int res = 0;
4291         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4292                 case FL_POSIX:
4293                         res = posix_lock_file_wait(file, fl);
4294                         break;
4295                 case FL_FLOCK:
4296                         res = flock_lock_file_wait(file, fl);
4297                         break;
4298                 default:
4299                         BUG();
4300         }
4301         return res;
4302 }
4303
4304 struct nfs4_unlockdata {
4305         struct nfs_locku_args arg;
4306         struct nfs_locku_res res;
4307         struct nfs4_lock_state *lsp;
4308         struct nfs_open_context *ctx;
4309         struct file_lock fl;
4310         const struct nfs_server *server;
4311         unsigned long timestamp;
4312 };
4313
4314 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4315                 struct nfs_open_context *ctx,
4316                 struct nfs4_lock_state *lsp,
4317                 struct nfs_seqid *seqid)
4318 {
4319         struct nfs4_unlockdata *p;
4320         struct inode *inode = lsp->ls_state->inode;
4321
4322         p = kzalloc(sizeof(*p), GFP_NOFS);
4323         if (p == NULL)
4324                 return NULL;
4325         p->arg.fh = NFS_FH(inode);
4326         p->arg.fl = &p->fl;
4327         p->arg.seqid = seqid;
4328         p->res.seqid = seqid;
4329         p->arg.stateid = &lsp->ls_stateid;
4330         p->lsp = lsp;
4331         atomic_inc(&lsp->ls_count);
4332         /* Ensure we don't close file until we're done freeing locks! */
4333         p->ctx = get_nfs_open_context(ctx);
4334         memcpy(&p->fl, fl, sizeof(p->fl));
4335         p->server = NFS_SERVER(inode);
4336         return p;
4337 }
4338
4339 static void nfs4_locku_release_calldata(void *data)
4340 {
4341         struct nfs4_unlockdata *calldata = data;
4342         nfs_free_seqid(calldata->arg.seqid);
4343         nfs4_put_lock_state(calldata->lsp);
4344         put_nfs_open_context(calldata->ctx);
4345         kfree(calldata);
4346 }
4347
4348 static void nfs4_locku_done(struct rpc_task *task, void *data)
4349 {
4350         struct nfs4_unlockdata *calldata = data;
4351
4352         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4353                 return;
4354         switch (task->tk_status) {
4355                 case 0:
4356                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4357                                         &calldata->res.stateid);
4358                         renew_lease(calldata->server, calldata->timestamp);
4359                         break;
4360                 case -NFS4ERR_BAD_STATEID:
4361                 case -NFS4ERR_OLD_STATEID:
4362                 case -NFS4ERR_STALE_STATEID:
4363                 case -NFS4ERR_EXPIRED:
4364                         break;
4365                 default:
4366                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4367                                 rpc_restart_call_prepare(task);
4368         }
4369 }
4370
4371 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4372 {
4373         struct nfs4_unlockdata *calldata = data;
4374
4375         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4376                 return;
4377         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4378                 /* Note: exit _without_ running nfs4_locku_done */
4379                 task->tk_action = NULL;
4380                 return;
4381         }
4382         calldata->timestamp = jiffies;
4383         if (nfs4_setup_sequence(calldata->server,
4384                                 &calldata->arg.seq_args,
4385                                 &calldata->res.seq_res, task))
4386                 return;
4387         rpc_call_start(task);
4388 }
4389
4390 static const struct rpc_call_ops nfs4_locku_ops = {
4391         .rpc_call_prepare = nfs4_locku_prepare,
4392         .rpc_call_done = nfs4_locku_done,
4393         .rpc_release = nfs4_locku_release_calldata,
4394 };
4395
4396 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4397                 struct nfs_open_context *ctx,
4398                 struct nfs4_lock_state *lsp,
4399                 struct nfs_seqid *seqid)
4400 {
4401         struct nfs4_unlockdata *data;
4402         struct rpc_message msg = {
4403                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4404                 .rpc_cred = ctx->cred,
4405         };
4406         struct rpc_task_setup task_setup_data = {
4407                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4408                 .rpc_message = &msg,
4409                 .callback_ops = &nfs4_locku_ops,
4410                 .workqueue = nfsiod_workqueue,
4411                 .flags = RPC_TASK_ASYNC,
4412         };
4413
4414         /* Ensure this is an unlock - when canceling a lock, the
4415          * canceled lock is passed in, and it won't be an unlock.
4416          */
4417         fl->fl_type = F_UNLCK;
4418
4419         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4420         if (data == NULL) {
4421                 nfs_free_seqid(seqid);
4422                 return ERR_PTR(-ENOMEM);
4423         }
4424
4425         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4426         msg.rpc_argp = &data->arg;
4427         msg.rpc_resp = &data->res;
4428         task_setup_data.callback_data = data;
4429         return rpc_run_task(&task_setup_data);
4430 }
4431
4432 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4433 {
4434         struct nfs_inode *nfsi = NFS_I(state->inode);
4435         struct nfs_seqid *seqid;
4436         struct nfs4_lock_state *lsp;
4437         struct rpc_task *task;
4438         int status = 0;
4439         unsigned char fl_flags = request->fl_flags;
4440
4441         status = nfs4_set_lock_state(state, request);
4442         /* Unlock _before_ we do the RPC call */
4443         request->fl_flags |= FL_EXISTS;
4444         down_read(&nfsi->rwsem);
4445         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4446                 up_read(&nfsi->rwsem);
4447                 goto out;
4448         }
4449         up_read(&nfsi->rwsem);
4450         if (status != 0)
4451                 goto out;
4452         /* Is this a delegated lock? */
4453         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4454                 goto out;
4455         lsp = request->fl_u.nfs4_fl.owner;
4456         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4457         status = -ENOMEM;
4458         if (seqid == NULL)
4459                 goto out;
4460         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4461         status = PTR_ERR(task);
4462         if (IS_ERR(task))
4463                 goto out;
4464         status = nfs4_wait_for_completion_rpc_task(task);
4465         rpc_put_task(task);
4466 out:
4467         request->fl_flags = fl_flags;
4468         return status;
4469 }
4470
4471 struct nfs4_lockdata {
4472         struct nfs_lock_args arg;
4473         struct nfs_lock_res res;
4474         struct nfs4_lock_state *lsp;
4475         struct nfs_open_context *ctx;
4476         struct file_lock fl;
4477         unsigned long timestamp;
4478         int rpc_status;
4479         int cancelled;
4480         struct nfs_server *server;
4481 };
4482
4483 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4484                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4485                 gfp_t gfp_mask)
4486 {
4487         struct nfs4_lockdata *p;
4488         struct inode *inode = lsp->ls_state->inode;
4489         struct nfs_server *server = NFS_SERVER(inode);
4490
4491         p = kzalloc(sizeof(*p), gfp_mask);
4492         if (p == NULL)
4493                 return NULL;
4494
4495         p->arg.fh = NFS_FH(inode);
4496         p->arg.fl = &p->fl;
4497         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4498         if (p->arg.open_seqid == NULL)
4499                 goto out_free;
4500         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4501         if (p->arg.lock_seqid == NULL)
4502                 goto out_free_seqid;
4503         p->arg.lock_stateid = &lsp->ls_stateid;
4504         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4505         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4506         p->arg.lock_owner.s_dev = server->s_dev;
4507         p->res.lock_seqid = p->arg.lock_seqid;
4508         p->lsp = lsp;
4509         p->server = server;
4510         atomic_inc(&lsp->ls_count);
4511         p->ctx = get_nfs_open_context(ctx);
4512         memcpy(&p->fl, fl, sizeof(p->fl));
4513         return p;
4514 out_free_seqid:
4515         nfs_free_seqid(p->arg.open_seqid);
4516 out_free:
4517         kfree(p);
4518         return NULL;
4519 }
4520
4521 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4522 {
4523         struct nfs4_lockdata *data = calldata;
4524         struct nfs4_state *state = data->lsp->ls_state;
4525
4526         dprintk("%s: begin!\n", __func__);
4527         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4528                 return;
4529         /* Do we need to do an open_to_lock_owner? */
4530         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4531                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4532                         return;
4533                 data->arg.open_stateid = &state->stateid;
4534                 data->arg.new_lock_owner = 1;
4535                 data->res.open_seqid = data->arg.open_seqid;
4536         } else
4537                 data->arg.new_lock_owner = 0;
4538         data->timestamp = jiffies;
4539         if (nfs4_setup_sequence(data->server,
4540                                 &data->arg.seq_args,
4541                                 &data->res.seq_res, task))
4542                 return;
4543         rpc_call_start(task);
4544         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4545 }
4546
4547 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4548 {
4549         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4550         nfs4_lock_prepare(task, calldata);
4551 }
4552
4553 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4554 {
4555         struct nfs4_lockdata *data = calldata;
4556
4557         dprintk("%s: begin!\n", __func__);
4558
4559         if (!nfs4_sequence_done(task, &data->res.seq_res))
4560                 return;
4561
4562         data->rpc_status = task->tk_status;
4563         if (data->arg.new_lock_owner != 0) {
4564                 if (data->rpc_status == 0)
4565                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4566                 else
4567                         goto out;
4568         }
4569         if (data->rpc_status == 0) {
4570                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4571                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4572                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4573         }
4574 out:
4575         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4576 }
4577
4578 static void nfs4_lock_release(void *calldata)
4579 {
4580         struct nfs4_lockdata *data = calldata;
4581
4582         dprintk("%s: begin!\n", __func__);
4583         nfs_free_seqid(data->arg.open_seqid);
4584         if (data->cancelled != 0) {
4585                 struct rpc_task *task;
4586                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4587                                 data->arg.lock_seqid);
4588                 if (!IS_ERR(task))
4589                         rpc_put_task_async(task);
4590                 dprintk("%s: cancelling lock!\n", __func__);
4591         } else
4592                 nfs_free_seqid(data->arg.lock_seqid);
4593         nfs4_put_lock_state(data->lsp);
4594         put_nfs_open_context(data->ctx);
4595         kfree(data);
4596         dprintk("%s: done!\n", __func__);
4597 }
4598
4599 static const struct rpc_call_ops nfs4_lock_ops = {
4600         .rpc_call_prepare = nfs4_lock_prepare,
4601         .rpc_call_done = nfs4_lock_done,
4602         .rpc_release = nfs4_lock_release,
4603 };
4604
4605 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4606         .rpc_call_prepare = nfs4_recover_lock_prepare,
4607         .rpc_call_done = nfs4_lock_done,
4608         .rpc_release = nfs4_lock_release,
4609 };
4610
4611 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4612 {
4613         switch (error) {
4614         case -NFS4ERR_ADMIN_REVOKED:
4615         case -NFS4ERR_BAD_STATEID:
4616                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4617                 if (new_lock_owner != 0 ||
4618                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4619                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4620                 break;
4621         case -NFS4ERR_STALE_STATEID:
4622                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4623         case -NFS4ERR_EXPIRED:
4624                 nfs4_schedule_lease_recovery(server->nfs_client);
4625         };
4626 }
4627
4628 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4629 {
4630         struct nfs4_lockdata *data;
4631         struct rpc_task *task;
4632         struct rpc_message msg = {
4633                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4634                 .rpc_cred = state->owner->so_cred,
4635         };
4636         struct rpc_task_setup task_setup_data = {
4637                 .rpc_client = NFS_CLIENT(state->inode),
4638                 .rpc_message = &msg,
4639                 .callback_ops = &nfs4_lock_ops,
4640                 .workqueue = nfsiod_workqueue,
4641                 .flags = RPC_TASK_ASYNC,
4642         };
4643         int ret;
4644
4645         dprintk("%s: begin!\n", __func__);
4646         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4647                         fl->fl_u.nfs4_fl.owner,
4648                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4649         if (data == NULL)
4650                 return -ENOMEM;
4651         if (IS_SETLKW(cmd))
4652                 data->arg.block = 1;
4653         if (recovery_type > NFS_LOCK_NEW) {
4654                 if (recovery_type == NFS_LOCK_RECLAIM)
4655                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4656                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4657         }
4658         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4659         msg.rpc_argp = &data->arg;
4660         msg.rpc_resp = &data->res;
4661         task_setup_data.callback_data = data;
4662         task = rpc_run_task(&task_setup_data);
4663         if (IS_ERR(task))
4664                 return PTR_ERR(task);
4665         ret = nfs4_wait_for_completion_rpc_task(task);
4666         if (ret == 0) {
4667                 ret = data->rpc_status;
4668                 if (ret)
4669                         nfs4_handle_setlk_error(data->server, data->lsp,
4670                                         data->arg.new_lock_owner, ret);
4671         } else
4672                 data->cancelled = 1;
4673         rpc_put_task(task);
4674         dprintk("%s: done, ret = %d!\n", __func__, ret);
4675         return ret;
4676 }
4677
4678 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4679 {
4680         struct nfs_server *server = NFS_SERVER(state->inode);
4681         struct nfs4_exception exception = {
4682                 .inode = state->inode,
4683         };
4684         int err;
4685
4686         do {
4687                 /* Cache the lock if possible... */
4688                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4689                         return 0;
4690                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4691                 if (err != -NFS4ERR_DELAY)
4692                         break;
4693                 nfs4_handle_exception(server, err, &exception);
4694         } while (exception.retry);
4695         return err;
4696 }
4697
4698 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4699 {
4700         struct nfs_server *server = NFS_SERVER(state->inode);
4701         struct nfs4_exception exception = {
4702                 .inode = state->inode,
4703         };
4704         int err;
4705
4706         err = nfs4_set_lock_state(state, request);
4707         if (err != 0)
4708                 return err;
4709         do {
4710                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4711                         return 0;
4712                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4713                 switch (err) {
4714                 default:
4715                         goto out;
4716                 case -NFS4ERR_GRACE:
4717                 case -NFS4ERR_DELAY:
4718                         nfs4_handle_exception(server, err, &exception);
4719                         err = 0;
4720                 }
4721         } while (exception.retry);
4722 out:
4723         return err;
4724 }
4725
4726 #if defined(CONFIG_NFS_V4_1)
4727 /**
4728  * nfs41_check_expired_locks - possibly free a lock stateid
4729  *
4730  * @state: NFSv4 state for an inode
4731  *
4732  * Returns NFS_OK if recovery for this stateid is now finished.
4733  * Otherwise a negative NFS4ERR value is returned.
4734  */
4735 static int nfs41_check_expired_locks(struct nfs4_state *state)
4736 {
4737         int status, ret = -NFS4ERR_BAD_STATEID;
4738         struct nfs4_lock_state *lsp;
4739         struct nfs_server *server = NFS_SERVER(state->inode);
4740
4741         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4742                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4743                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4744                         if (status != NFS_OK) {
4745                                 /* Free the stateid unless the server
4746                                  * informs us the stateid is unrecognized. */
4747                                 if (status != -NFS4ERR_BAD_STATEID)
4748                                         nfs41_free_stateid(server,
4749                                                         &lsp->ls_stateid);
4750                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4751                                 ret = status;
4752                         }
4753                 }
4754         };
4755
4756         return ret;
4757 }
4758
4759 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4760 {
4761         int status = NFS_OK;
4762
4763         if (test_bit(LK_STATE_IN_USE, &state->flags))
4764                 status = nfs41_check_expired_locks(state);
4765         if (status != NFS_OK)
4766                 status = nfs4_lock_expired(state, request);
4767         return status;
4768 }
4769 #endif
4770
4771 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4772 {
4773         struct nfs_inode *nfsi = NFS_I(state->inode);
4774         unsigned char fl_flags = request->fl_flags;
4775         int status = -ENOLCK;
4776
4777         if ((fl_flags & FL_POSIX) &&
4778                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4779                 goto out;
4780         /* Is this a delegated open? */
4781         status = nfs4_set_lock_state(state, request);
4782         if (status != 0)
4783                 goto out;
4784         request->fl_flags |= FL_ACCESS;
4785         status = do_vfs_lock(request->fl_file, request);
4786         if (status < 0)
4787                 goto out;
4788         down_read(&nfsi->rwsem);
4789         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4790                 /* Yes: cache locks! */
4791                 /* ...but avoid races with delegation recall... */
4792                 request->fl_flags = fl_flags & ~FL_SLEEP;
4793                 status = do_vfs_lock(request->fl_file, request);
4794                 goto out_unlock;
4795         }
4796         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4797         if (status != 0)
4798                 goto out_unlock;
4799         /* Note: we always want to sleep here! */
4800         request->fl_flags = fl_flags | FL_SLEEP;
4801         if (do_vfs_lock(request->fl_file, request) < 0)
4802                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4803                         "manager!\n", __func__);
4804 out_unlock:
4805         up_read(&nfsi->rwsem);
4806 out:
4807         request->fl_flags = fl_flags;
4808         return status;
4809 }
4810
4811 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4812 {
4813         struct nfs4_exception exception = {
4814                 .state = state,
4815                 .inode = state->inode,
4816         };
4817         int err;
4818
4819         do {
4820                 err = _nfs4_proc_setlk(state, cmd, request);
4821                 if (err == -NFS4ERR_DENIED)
4822                         err = -EAGAIN;
4823                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4824                                 err, &exception);
4825         } while (exception.retry);
4826         return err;
4827 }
4828
4829 static int
4830 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4831 {
4832         struct nfs_open_context *ctx;
4833         struct nfs4_state *state;
4834         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4835         int status;
4836
4837         /* verify open state */
4838         ctx = nfs_file_open_context(filp);
4839         state = ctx->state;
4840
4841         if (request->fl_start < 0 || request->fl_end < 0)
4842                 return -EINVAL;
4843
4844         if (IS_GETLK(cmd)) {
4845                 if (state != NULL)
4846                         return nfs4_proc_getlk(state, F_GETLK, request);
4847                 return 0;
4848         }
4849
4850         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4851                 return -EINVAL;
4852
4853         if (request->fl_type == F_UNLCK) {
4854                 if (state != NULL)
4855                         return nfs4_proc_unlck(state, cmd, request);
4856                 return 0;
4857         }
4858
4859         if (state == NULL)
4860                 return -ENOLCK;
4861         /*
4862          * Don't rely on the VFS having checked the file open mode,
4863          * since it won't do this for flock() locks.
4864          */
4865         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4866         case F_RDLCK:
4867                 if (!(filp->f_mode & FMODE_READ))
4868                         return -EBADF;
4869                 break;
4870         case F_WRLCK:
4871                 if (!(filp->f_mode & FMODE_WRITE))
4872                         return -EBADF;
4873         }
4874
4875         do {
4876                 status = nfs4_proc_setlk(state, cmd, request);
4877                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4878                         break;
4879                 timeout = nfs4_set_lock_task_retry(timeout);
4880                 status = -ERESTARTSYS;
4881                 if (signalled())
4882                         break;
4883         } while(status < 0);
4884         return status;
4885 }
4886
4887 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4888 {
4889         struct nfs_server *server = NFS_SERVER(state->inode);
4890         struct nfs4_exception exception = { };
4891         int err;
4892
4893         err = nfs4_set_lock_state(state, fl);
4894         if (err != 0)
4895                 goto out;
4896         do {
4897                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4898                 switch (err) {
4899                         default:
4900                                 printk(KERN_ERR "NFS: %s: unhandled error "
4901                                         "%d.\n", __func__, err);
4902                         case 0:
4903                         case -ESTALE:
4904                                 goto out;
4905                         case -NFS4ERR_EXPIRED:
4906                                 nfs4_schedule_stateid_recovery(server, state);
4907                         case -NFS4ERR_STALE_CLIENTID:
4908                         case -NFS4ERR_STALE_STATEID:
4909                                 nfs4_schedule_lease_recovery(server->nfs_client);
4910                                 goto out;
4911                         case -NFS4ERR_BADSESSION:
4912                         case -NFS4ERR_BADSLOT:
4913                         case -NFS4ERR_BAD_HIGH_SLOT:
4914                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4915                         case -NFS4ERR_DEADSESSION:
4916                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4917                                 goto out;
4918                         case -ERESTARTSYS:
4919                                 /*
4920                                  * The show must go on: exit, but mark the
4921                                  * stateid as needing recovery.
4922                                  */
4923                         case -NFS4ERR_DELEG_REVOKED:
4924                         case -NFS4ERR_ADMIN_REVOKED:
4925                         case -NFS4ERR_BAD_STATEID:
4926                         case -NFS4ERR_OPENMODE:
4927                                 nfs4_schedule_stateid_recovery(server, state);
4928                                 err = 0;
4929                                 goto out;
4930                         case -EKEYEXPIRED:
4931                                 /*
4932                                  * User RPCSEC_GSS context has expired.
4933                                  * We cannot recover this stateid now, so
4934                                  * skip it and allow recovery thread to
4935                                  * proceed.
4936                                  */
4937                                 err = 0;
4938                                 goto out;
4939                         case -ENOMEM:
4940                         case -NFS4ERR_DENIED:
4941                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4942                                 err = 0;
4943                                 goto out;
4944                         case -NFS4ERR_DELAY:
4945                                 break;
4946                 }
4947                 err = nfs4_handle_exception(server, err, &exception);
4948         } while (exception.retry);
4949 out:
4950         return err;
4951 }
4952
4953 struct nfs_release_lockowner_data {
4954         struct nfs4_lock_state *lsp;
4955         struct nfs_server *server;
4956         struct nfs_release_lockowner_args args;
4957 };
4958
4959 static void nfs4_release_lockowner_release(void *calldata)
4960 {
4961         struct nfs_release_lockowner_data *data = calldata;
4962         nfs4_free_lock_state(data->server, data->lsp);
4963         kfree(calldata);
4964 }
4965
4966 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4967         .rpc_release = nfs4_release_lockowner_release,
4968 };
4969
4970 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4971 {
4972         struct nfs_server *server = lsp->ls_state->owner->so_server;
4973         struct nfs_release_lockowner_data *data;
4974         struct rpc_message msg = {
4975                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4976         };
4977
4978         if (server->nfs_client->cl_mvops->minor_version != 0)
4979                 return -EINVAL;
4980         data = kmalloc(sizeof(*data), GFP_NOFS);
4981         if (!data)
4982                 return -ENOMEM;
4983         data->lsp = lsp;
4984         data->server = server;
4985         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4986         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4987         data->args.lock_owner.s_dev = server->s_dev;
4988         msg.rpc_argp = &data->args;
4989         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4990         return 0;
4991 }
4992
4993 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4994
4995 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4996                                    const void *buf, size_t buflen,
4997                                    int flags, int type)
4998 {
4999         if (strcmp(key, "") != 0)
5000                 return -EINVAL;
5001
5002         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5003 }
5004
5005 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5006                                    void *buf, size_t buflen, int type)
5007 {
5008         if (strcmp(key, "") != 0)
5009                 return -EINVAL;
5010
5011         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5012 }
5013
5014 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5015                                        size_t list_len, const char *name,
5016                                        size_t name_len, int type)
5017 {
5018         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5019
5020         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5021                 return 0;
5022
5023         if (list && len <= list_len)
5024                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5025         return len;
5026 }
5027
5028 /*
5029  * nfs_fhget will use either the mounted_on_fileid or the fileid
5030  */
5031 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5032 {
5033         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5034                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5035               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5036               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5037                 return;
5038
5039         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5040                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5041         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5042         fattr->nlink = 2;
5043 }
5044
5045 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5046                                    const struct qstr *name,
5047                                    struct nfs4_fs_locations *fs_locations,
5048                                    struct page *page)
5049 {
5050         struct nfs_server *server = NFS_SERVER(dir);
5051         u32 bitmask[2] = {
5052                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5053         };
5054         struct nfs4_fs_locations_arg args = {
5055                 .dir_fh = NFS_FH(dir),
5056                 .name = name,
5057                 .page = page,
5058                 .bitmask = bitmask,
5059         };
5060         struct nfs4_fs_locations_res res = {
5061                 .fs_locations = fs_locations,
5062         };
5063         struct rpc_message msg = {
5064                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5065                 .rpc_argp = &args,
5066                 .rpc_resp = &res,
5067         };
5068         int status;
5069
5070         dprintk("%s: start\n", __func__);
5071
5072         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5073          * is not supported */
5074         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5075                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5076         else
5077                 bitmask[0] |= FATTR4_WORD0_FILEID;
5078
5079         nfs_fattr_init(&fs_locations->fattr);
5080         fs_locations->server = server;
5081         fs_locations->nlocations = 0;
5082         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5083         dprintk("%s: returned status = %d\n", __func__, status);
5084         return status;
5085 }
5086
5087 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5088                            const struct qstr *name,
5089                            struct nfs4_fs_locations *fs_locations,
5090                            struct page *page)
5091 {
5092         struct nfs4_exception exception = { };
5093         int err;
5094         do {
5095                 err = nfs4_handle_exception(NFS_SERVER(dir),
5096                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5097                                 &exception);
5098         } while (exception.retry);
5099         return err;
5100 }
5101
5102 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5103 {
5104         int status;
5105         struct nfs4_secinfo_arg args = {
5106                 .dir_fh = NFS_FH(dir),
5107                 .name   = name,
5108         };
5109         struct nfs4_secinfo_res res = {
5110                 .flavors     = flavors,
5111         };
5112         struct rpc_message msg = {
5113                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5114                 .rpc_argp = &args,
5115                 .rpc_resp = &res,
5116         };
5117
5118         dprintk("NFS call  secinfo %s\n", name->name);
5119         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5120         dprintk("NFS reply  secinfo: %d\n", status);
5121         return status;
5122 }
5123
5124 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5125                       struct nfs4_secinfo_flavors *flavors)
5126 {
5127         struct nfs4_exception exception = { };
5128         int err;
5129         do {
5130                 err = nfs4_handle_exception(NFS_SERVER(dir),
5131                                 _nfs4_proc_secinfo(dir, name, flavors),
5132                                 &exception);
5133         } while (exception.retry);
5134         return err;
5135 }
5136
5137 #ifdef CONFIG_NFS_V4_1
5138 /*
5139  * Check the exchange flags returned by the server for invalid flags, having
5140  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5141  * DS flags set.
5142  */
5143 static int nfs4_check_cl_exchange_flags(u32 flags)
5144 {
5145         if (flags & ~EXCHGID4_FLAG_MASK_R)
5146                 goto out_inval;
5147         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5148             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5149                 goto out_inval;
5150         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5151                 goto out_inval;
5152         return NFS_OK;
5153 out_inval:
5154         return -NFS4ERR_INVAL;
5155 }
5156
5157 static bool
5158 nfs41_same_server_scope(struct nfs41_server_scope *a,
5159                         struct nfs41_server_scope *b)
5160 {
5161         if (a->server_scope_sz == b->server_scope_sz &&
5162             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5163                 return true;
5164
5165         return false;
5166 }
5167
5168 /*
5169  * nfs4_proc_bind_conn_to_session()
5170  *
5171  * The 4.1 client currently uses the same TCP connection for the
5172  * fore and backchannel.
5173  */
5174 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5175 {
5176         int status;
5177         struct nfs41_bind_conn_to_session_res res;
5178         struct rpc_message msg = {
5179                 .rpc_proc =
5180                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5181                 .rpc_argp = clp,
5182                 .rpc_resp = &res,
5183                 .rpc_cred = cred,
5184         };
5185
5186         dprintk("--> %s\n", __func__);
5187         BUG_ON(clp == NULL);
5188
5189         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5190         if (unlikely(res.session == NULL)) {
5191                 status = -ENOMEM;
5192                 goto out;
5193         }
5194
5195         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5196         if (status == 0) {
5197                 if (memcmp(res.session->sess_id.data,
5198                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5199                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5200                         status = -EIO;
5201                         goto out_session;
5202                 }
5203                 if (res.dir != NFS4_CDFS4_BOTH) {
5204                         dprintk("NFS: %s: Unexpected direction from server\n",
5205                                 __func__);
5206                         status = -EIO;
5207                         goto out_session;
5208                 }
5209                 if (res.use_conn_in_rdma_mode) {
5210                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5211                                 __func__);
5212                         status = -EIO;
5213                         goto out_session;
5214                 }
5215         }
5216 out_session:
5217         kfree(res.session);
5218 out:
5219         dprintk("<-- %s status= %d\n", __func__, status);
5220         return status;
5221 }
5222
5223 /*
5224  * nfs4_proc_exchange_id()
5225  *
5226  * Since the clientid has expired, all compounds using sessions
5227  * associated with the stale clientid will be returning
5228  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5229  * be in some phase of session reset.
5230  */
5231 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5232 {
5233         nfs4_verifier verifier;
5234         struct nfs41_exchange_id_args args = {
5235                 .verifier = &verifier,
5236                 .client = clp,
5237                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5238         };
5239         struct nfs41_exchange_id_res res = {
5240                 0
5241         };
5242         int status;
5243         struct rpc_message msg = {
5244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5245                 .rpc_argp = &args,
5246                 .rpc_resp = &res,
5247                 .rpc_cred = cred,
5248         };
5249
5250         dprintk("--> %s\n", __func__);
5251         BUG_ON(clp == NULL);
5252
5253         nfs4_init_boot_verifier(clp, &verifier);
5254
5255         args.id_len = scnprintf(args.id, sizeof(args.id),
5256                                 "%s/%s/%u",
5257                                 clp->cl_ipaddr,
5258                                 clp->cl_rpcclient->cl_nodename,
5259                                 clp->cl_rpcclient->cl_auth->au_flavor);
5260
5261         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5262                                         GFP_NOFS);
5263         if (unlikely(res.server_owner == NULL)) {
5264                 status = -ENOMEM;
5265                 goto out;
5266         }
5267
5268         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5269                                         GFP_NOFS);
5270         if (unlikely(res.server_scope == NULL)) {
5271                 status = -ENOMEM;
5272                 goto out_server_owner;
5273         }
5274
5275         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5276         if (unlikely(res.impl_id == NULL)) {
5277                 status = -ENOMEM;
5278                 goto out_server_scope;
5279         }
5280
5281         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5282         if (status == 0)
5283                 status = nfs4_check_cl_exchange_flags(res.flags);
5284
5285         if (status == 0) {
5286                 clp->cl_clientid = res.clientid;
5287                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5288                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5289                         clp->cl_seqid = res.seqid;
5290
5291                 kfree(clp->cl_serverowner);
5292                 clp->cl_serverowner = res.server_owner;
5293                 res.server_owner = NULL;
5294
5295                 /* use the most recent implementation id */
5296                 kfree(clp->cl_implid);
5297                 clp->cl_implid = res.impl_id;
5298
5299                 if (clp->cl_serverscope != NULL &&
5300                     !nfs41_same_server_scope(clp->cl_serverscope,
5301                                              res.server_scope)) {
5302                         dprintk("%s: server_scope mismatch detected\n",
5303                                 __func__);
5304                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5305                         kfree(clp->cl_serverscope);
5306                         clp->cl_serverscope = NULL;
5307                 }
5308
5309                 if (clp->cl_serverscope == NULL) {
5310                         clp->cl_serverscope = res.server_scope;
5311                         goto out;
5312                 }
5313         } else
5314                 kfree(res.impl_id);
5315
5316 out_server_owner:
5317         kfree(res.server_owner);
5318 out_server_scope:
5319         kfree(res.server_scope);
5320 out:
5321         if (clp->cl_implid != NULL)
5322                 dprintk("%s: Server Implementation ID: "
5323                         "domain: %s, name: %s, date: %llu,%u\n",
5324                         __func__, clp->cl_implid->domain, clp->cl_implid->name,
5325                         clp->cl_implid->date.seconds,
5326                         clp->cl_implid->date.nseconds);
5327         dprintk("<-- %s status= %d\n", __func__, status);
5328         return status;
5329 }
5330
5331 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5332                 struct rpc_cred *cred)
5333 {
5334         struct rpc_message msg = {
5335                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5336                 .rpc_argp = clp,
5337                 .rpc_cred = cred,
5338         };
5339         int status;
5340
5341         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5342         if (status)
5343                 dprintk("NFS: Got error %d from the server %s on "
5344                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5345         return status;
5346 }
5347
5348 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5349                 struct rpc_cred *cred)
5350 {
5351         unsigned int loop;
5352         int ret;
5353
5354         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5355                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5356                 switch (ret) {
5357                 case -NFS4ERR_DELAY:
5358                 case -NFS4ERR_CLIENTID_BUSY:
5359                         ssleep(1);
5360                         break;
5361                 default:
5362                         return ret;
5363                 }
5364         }
5365         return 0;
5366 }
5367
5368 int nfs4_destroy_clientid(struct nfs_client *clp)
5369 {
5370         struct rpc_cred *cred;
5371         int ret = 0;
5372
5373         if (clp->cl_mvops->minor_version < 1)
5374                 goto out;
5375         if (clp->cl_exchange_flags == 0)
5376                 goto out;
5377         cred = nfs4_get_exchange_id_cred(clp);
5378         ret = nfs4_proc_destroy_clientid(clp, cred);
5379         if (cred)
5380                 put_rpccred(cred);
5381         switch (ret) {
5382         case 0:
5383         case -NFS4ERR_STALE_CLIENTID:
5384                 clp->cl_exchange_flags = 0;
5385         }
5386 out:
5387         return ret;
5388 }
5389
5390 struct nfs4_get_lease_time_data {
5391         struct nfs4_get_lease_time_args *args;
5392         struct nfs4_get_lease_time_res *res;
5393         struct nfs_client *clp;
5394 };
5395
5396 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5397                                         void *calldata)
5398 {
5399         int ret;
5400         struct nfs4_get_lease_time_data *data =
5401                         (struct nfs4_get_lease_time_data *)calldata;
5402
5403         dprintk("--> %s\n", __func__);
5404         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5405         /* just setup sequence, do not trigger session recovery
5406            since we're invoked within one */
5407         ret = nfs41_setup_sequence(data->clp->cl_session,
5408                                    &data->args->la_seq_args,
5409                                    &data->res->lr_seq_res, task);
5410
5411         BUG_ON(ret == -EAGAIN);
5412         rpc_call_start(task);
5413         dprintk("<-- %s\n", __func__);
5414 }
5415
5416 /*
5417  * Called from nfs4_state_manager thread for session setup, so don't recover
5418  * from sequence operation or clientid errors.
5419  */
5420 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5421 {
5422         struct nfs4_get_lease_time_data *data =
5423                         (struct nfs4_get_lease_time_data *)calldata;
5424
5425         dprintk("--> %s\n", __func__);
5426         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5427                 return;
5428         switch (task->tk_status) {
5429         case -NFS4ERR_DELAY:
5430         case -NFS4ERR_GRACE:
5431                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5432                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5433                 task->tk_status = 0;
5434                 /* fall through */
5435         case -NFS4ERR_RETRY_UNCACHED_REP:
5436                 rpc_restart_call_prepare(task);
5437                 return;
5438         }
5439         dprintk("<-- %s\n", __func__);
5440 }
5441
5442 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5443         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5444         .rpc_call_done = nfs4_get_lease_time_done,
5445 };
5446
5447 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5448 {
5449         struct rpc_task *task;
5450         struct nfs4_get_lease_time_args args;
5451         struct nfs4_get_lease_time_res res = {
5452                 .lr_fsinfo = fsinfo,
5453         };
5454         struct nfs4_get_lease_time_data data = {
5455                 .args = &args,
5456                 .res = &res,
5457                 .clp = clp,
5458         };
5459         struct rpc_message msg = {
5460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5461                 .rpc_argp = &args,
5462                 .rpc_resp = &res,
5463         };
5464         struct rpc_task_setup task_setup = {
5465                 .rpc_client = clp->cl_rpcclient,
5466                 .rpc_message = &msg,
5467                 .callback_ops = &nfs4_get_lease_time_ops,
5468                 .callback_data = &data,
5469                 .flags = RPC_TASK_TIMEOUT,
5470         };
5471         int status;
5472
5473         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5474         dprintk("--> %s\n", __func__);
5475         task = rpc_run_task(&task_setup);
5476
5477         if (IS_ERR(task))
5478                 status = PTR_ERR(task);
5479         else {
5480                 status = task->tk_status;
5481                 rpc_put_task(task);
5482         }
5483         dprintk("<-- %s return %d\n", __func__, status);
5484
5485         return status;
5486 }
5487
5488 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5489 {
5490         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5491 }
5492
5493 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5494                 struct nfs4_slot *new,
5495                 u32 max_slots,
5496                 u32 ivalue)
5497 {
5498         struct nfs4_slot *old = NULL;
5499         u32 i;
5500
5501         spin_lock(&tbl->slot_tbl_lock);
5502         if (new) {
5503                 old = tbl->slots;
5504                 tbl->slots = new;
5505                 tbl->max_slots = max_slots;
5506         }
5507         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5508         for (i = 0; i < tbl->max_slots; i++)
5509                 tbl->slots[i].seq_nr = ivalue;
5510         spin_unlock(&tbl->slot_tbl_lock);
5511         kfree(old);
5512 }
5513
5514 /*
5515  * (re)Initialise a slot table
5516  */
5517 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5518                                  u32 ivalue)
5519 {
5520         struct nfs4_slot *new = NULL;
5521         int ret = -ENOMEM;
5522
5523         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5524                 max_reqs, tbl->max_slots);
5525
5526         /* Does the newly negotiated max_reqs match the existing slot table? */
5527         if (max_reqs != tbl->max_slots) {
5528                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5529                 if (!new)
5530                         goto out;
5531         }
5532         ret = 0;
5533
5534         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5535         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5536                 tbl, tbl->slots, tbl->max_slots);
5537 out:
5538         dprintk("<-- %s: return %d\n", __func__, ret);
5539         return ret;
5540 }
5541
5542 /* Destroy the slot table */
5543 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5544 {
5545         if (session->fc_slot_table.slots != NULL) {
5546                 kfree(session->fc_slot_table.slots);
5547                 session->fc_slot_table.slots = NULL;
5548         }
5549         if (session->bc_slot_table.slots != NULL) {
5550                 kfree(session->bc_slot_table.slots);
5551                 session->bc_slot_table.slots = NULL;
5552         }
5553         return;
5554 }
5555
5556 /*
5557  * Initialize or reset the forechannel and backchannel tables
5558  */
5559 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5560 {
5561         struct nfs4_slot_table *tbl;
5562         int status;
5563
5564         dprintk("--> %s\n", __func__);
5565         /* Fore channel */
5566         tbl = &ses->fc_slot_table;
5567         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5568         if (status) /* -ENOMEM */
5569                 return status;
5570         /* Back channel */
5571         tbl = &ses->bc_slot_table;
5572         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5573         if (status && tbl->slots == NULL)
5574                 /* Fore and back channel share a connection so get
5575                  * both slot tables or neither */
5576                 nfs4_destroy_slot_tables(ses);
5577         return status;
5578 }
5579
5580 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5581 {
5582         struct nfs4_session *session;
5583         struct nfs4_slot_table *tbl;
5584
5585         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5586         if (!session)
5587                 return NULL;
5588
5589         tbl = &session->fc_slot_table;
5590         tbl->highest_used_slotid = NFS4_NO_SLOT;
5591         spin_lock_init(&tbl->slot_tbl_lock);
5592         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5593         init_completion(&tbl->complete);
5594
5595         tbl = &session->bc_slot_table;
5596         tbl->highest_used_slotid = NFS4_NO_SLOT;
5597         spin_lock_init(&tbl->slot_tbl_lock);
5598         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5599         init_completion(&tbl->complete);
5600
5601         session->session_state = 1<<NFS4_SESSION_INITING;
5602
5603         session->clp = clp;
5604         return session;
5605 }
5606
5607 void nfs4_destroy_session(struct nfs4_session *session)
5608 {
5609         struct rpc_xprt *xprt;
5610         struct rpc_cred *cred;
5611
5612         cred = nfs4_get_exchange_id_cred(session->clp);
5613         nfs4_proc_destroy_session(session, cred);
5614         if (cred)
5615                 put_rpccred(cred);
5616
5617         rcu_read_lock();
5618         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5619         rcu_read_unlock();
5620         dprintk("%s Destroy backchannel for xprt %p\n",
5621                 __func__, xprt);
5622         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5623         nfs4_destroy_slot_tables(session);
5624         kfree(session);
5625 }
5626
5627 /*
5628  * Initialize the values to be used by the client in CREATE_SESSION
5629  * If nfs4_init_session set the fore channel request and response sizes,
5630  * use them.
5631  *
5632  * Set the back channel max_resp_sz_cached to zero to force the client to
5633  * always set csa_cachethis to FALSE because the current implementation
5634  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5635  */
5636 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5637 {
5638         struct nfs4_session *session = args->client->cl_session;
5639         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5640                      mxresp_sz = session->fc_attrs.max_resp_sz;
5641
5642         if (mxrqst_sz == 0)
5643                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5644         if (mxresp_sz == 0)
5645                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5646         /* Fore channel attributes */
5647         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5648         args->fc_attrs.max_resp_sz = mxresp_sz;
5649         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5650         args->fc_attrs.max_reqs = max_session_slots;
5651
5652         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5653                 "max_ops=%u max_reqs=%u\n",
5654                 __func__,
5655                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5656                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5657
5658         /* Back channel attributes */
5659         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5660         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5661         args->bc_attrs.max_resp_sz_cached = 0;
5662         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5663         args->bc_attrs.max_reqs = 1;
5664
5665         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5666                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5667                 __func__,
5668                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5669                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5670                 args->bc_attrs.max_reqs);
5671 }
5672
5673 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5674 {
5675         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5676         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5677
5678         if (rcvd->max_resp_sz > sent->max_resp_sz)
5679                 return -EINVAL;
5680         /*
5681          * Our requested max_ops is the minimum we need; we're not
5682          * prepared to break up compounds into smaller pieces than that.
5683          * So, no point even trying to continue if the server won't
5684          * cooperate:
5685          */
5686         if (rcvd->max_ops < sent->max_ops)
5687                 return -EINVAL;
5688         if (rcvd->max_reqs == 0)
5689                 return -EINVAL;
5690         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5691                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5692         return 0;
5693 }
5694
5695 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5696 {
5697         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5698         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5699
5700         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5701                 return -EINVAL;
5702         if (rcvd->max_resp_sz < sent->max_resp_sz)
5703                 return -EINVAL;
5704         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5705                 return -EINVAL;
5706         /* These would render the backchannel useless: */
5707         if (rcvd->max_ops != sent->max_ops)
5708                 return -EINVAL;
5709         if (rcvd->max_reqs != sent->max_reqs)
5710                 return -EINVAL;
5711         return 0;
5712 }
5713
5714 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5715                                      struct nfs4_session *session)
5716 {
5717         int ret;
5718
5719         ret = nfs4_verify_fore_channel_attrs(args, session);
5720         if (ret)
5721                 return ret;
5722         return nfs4_verify_back_channel_attrs(args, session);
5723 }
5724
5725 static int _nfs4_proc_create_session(struct nfs_client *clp,
5726                 struct rpc_cred *cred)
5727 {
5728         struct nfs4_session *session = clp->cl_session;
5729         struct nfs41_create_session_args args = {
5730                 .client = clp,
5731                 .cb_program = NFS4_CALLBACK,
5732         };
5733         struct nfs41_create_session_res res = {
5734                 .client = clp,
5735         };
5736         struct rpc_message msg = {
5737                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5738                 .rpc_argp = &args,
5739                 .rpc_resp = &res,
5740                 .rpc_cred = cred,
5741         };
5742         int status;
5743
5744         nfs4_init_channel_attrs(&args);
5745         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5746
5747         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5748
5749         if (!status)
5750                 /* Verify the session's negotiated channel_attrs values */
5751                 status = nfs4_verify_channel_attrs(&args, session);
5752         if (!status) {
5753                 /* Increment the clientid slot sequence id */
5754                 clp->cl_seqid++;
5755         }
5756
5757         return status;
5758 }
5759
5760 /*
5761  * Issues a CREATE_SESSION operation to the server.
5762  * It is the responsibility of the caller to verify the session is
5763  * expired before calling this routine.
5764  */
5765 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5766 {
5767         int status;
5768         unsigned *ptr;
5769         struct nfs4_session *session = clp->cl_session;
5770
5771         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5772
5773         status = _nfs4_proc_create_session(clp, cred);
5774         if (status)
5775                 goto out;
5776
5777         /* Init or reset the session slot tables */
5778         status = nfs4_setup_session_slot_tables(session);
5779         dprintk("slot table setup returned %d\n", status);
5780         if (status)
5781                 goto out;
5782
5783         ptr = (unsigned *)&session->sess_id.data[0];
5784         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5785                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5786 out:
5787         dprintk("<-- %s\n", __func__);
5788         return status;
5789 }
5790
5791 /*
5792  * Issue the over-the-wire RPC DESTROY_SESSION.
5793  * The caller must serialize access to this routine.
5794  */
5795 int nfs4_proc_destroy_session(struct nfs4_session *session,
5796                 struct rpc_cred *cred)
5797 {
5798         struct rpc_message msg = {
5799                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5800                 .rpc_argp = session,
5801                 .rpc_cred = cred,
5802         };
5803         int status = 0;
5804
5805         dprintk("--> nfs4_proc_destroy_session\n");
5806
5807         /* session is still being setup */
5808         if (session->clp->cl_cons_state != NFS_CS_READY)
5809                 return status;
5810
5811         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5812
5813         if (status)
5814                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5815                         "Session has been destroyed regardless...\n", status);
5816
5817         dprintk("<-- nfs4_proc_destroy_session\n");
5818         return status;
5819 }
5820
5821 /*
5822  * With sessions, the client is not marked ready until after a
5823  * successful EXCHANGE_ID and CREATE_SESSION.
5824  *
5825  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5826  * other versions of NFS can be tried.
5827  */
5828 static int nfs41_check_session_ready(struct nfs_client *clp)
5829 {
5830         int ret;
5831
5832         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
5833                 ret = nfs4_client_recover_expired_lease(clp);
5834                 if (ret)
5835                         return ret;
5836         }
5837         if (clp->cl_cons_state < NFS_CS_READY)
5838                 return -EPROTONOSUPPORT;
5839         smp_rmb();
5840         return 0;
5841 }
5842
5843 int nfs4_init_session(struct nfs_server *server)
5844 {
5845         struct nfs_client *clp = server->nfs_client;
5846         struct nfs4_session *session;
5847         unsigned int rsize, wsize;
5848
5849         if (!nfs4_has_session(clp))
5850                 return 0;
5851
5852         session = clp->cl_session;
5853         spin_lock(&clp->cl_lock);
5854         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5855
5856                 rsize = server->rsize;
5857                 if (rsize == 0)
5858                         rsize = NFS_MAX_FILE_IO_SIZE;
5859                 wsize = server->wsize;
5860                 if (wsize == 0)
5861                         wsize = NFS_MAX_FILE_IO_SIZE;
5862
5863                 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5864                 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5865         }
5866         spin_unlock(&clp->cl_lock);
5867
5868         return nfs41_check_session_ready(clp);
5869 }
5870
5871 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
5872 {
5873         struct nfs4_session *session = clp->cl_session;
5874         int ret;
5875
5876         spin_lock(&clp->cl_lock);
5877         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5878                 /*
5879                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
5880                  * DS lease to be equal to the MDS lease.
5881                  */
5882                 clp->cl_lease_time = lease_time;
5883                 clp->cl_last_renewal = jiffies;
5884         }
5885         spin_unlock(&clp->cl_lock);
5886
5887         ret = nfs41_check_session_ready(clp);
5888         if (ret)
5889                 return ret;
5890         /* Test for the DS role */
5891         if (!is_ds_client(clp))
5892                 return -ENODEV;
5893         return 0;
5894 }
5895 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5896
5897
5898 /*
5899  * Renew the cl_session lease.
5900  */
5901 struct nfs4_sequence_data {
5902         struct nfs_client *clp;
5903         struct nfs4_sequence_args args;
5904         struct nfs4_sequence_res res;
5905 };
5906
5907 static void nfs41_sequence_release(void *data)
5908 {
5909         struct nfs4_sequence_data *calldata = data;
5910         struct nfs_client *clp = calldata->clp;
5911
5912         if (atomic_read(&clp->cl_count) > 1)
5913                 nfs4_schedule_state_renewal(clp);
5914         nfs_put_client(clp);
5915         kfree(calldata);
5916 }
5917
5918 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5919 {
5920         switch(task->tk_status) {
5921         case -NFS4ERR_DELAY:
5922                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5923                 return -EAGAIN;
5924         default:
5925                 nfs4_schedule_lease_recovery(clp);
5926         }
5927         return 0;
5928 }
5929
5930 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5931 {
5932         struct nfs4_sequence_data *calldata = data;
5933         struct nfs_client *clp = calldata->clp;
5934
5935         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5936                 return;
5937
5938         if (task->tk_status < 0) {
5939                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5940                 if (atomic_read(&clp->cl_count) == 1)
5941                         goto out;
5942
5943                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5944                         rpc_restart_call_prepare(task);
5945                         return;
5946                 }
5947         }
5948         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5949 out:
5950         dprintk("<-- %s\n", __func__);
5951 }
5952
5953 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5954 {
5955         struct nfs4_sequence_data *calldata = data;
5956         struct nfs_client *clp = calldata->clp;
5957         struct nfs4_sequence_args *args;
5958         struct nfs4_sequence_res *res;
5959
5960         args = task->tk_msg.rpc_argp;
5961         res = task->tk_msg.rpc_resp;
5962
5963         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5964                 return;
5965         rpc_call_start(task);
5966 }
5967
5968 static const struct rpc_call_ops nfs41_sequence_ops = {
5969         .rpc_call_done = nfs41_sequence_call_done,
5970         .rpc_call_prepare = nfs41_sequence_prepare,
5971         .rpc_release = nfs41_sequence_release,
5972 };
5973
5974 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5975 {
5976         struct nfs4_sequence_data *calldata;
5977         struct rpc_message msg = {
5978                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5979                 .rpc_cred = cred,
5980         };
5981         struct rpc_task_setup task_setup_data = {
5982                 .rpc_client = clp->cl_rpcclient,
5983                 .rpc_message = &msg,
5984                 .callback_ops = &nfs41_sequence_ops,
5985                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5986         };
5987
5988         if (!atomic_inc_not_zero(&clp->cl_count))
5989                 return ERR_PTR(-EIO);
5990         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5991         if (calldata == NULL) {
5992                 nfs_put_client(clp);
5993                 return ERR_PTR(-ENOMEM);
5994         }
5995         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5996         msg.rpc_argp = &calldata->args;
5997         msg.rpc_resp = &calldata->res;
5998         calldata->clp = clp;
5999         task_setup_data.callback_data = calldata;
6000
6001         return rpc_run_task(&task_setup_data);
6002 }
6003
6004 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6005 {
6006         struct rpc_task *task;
6007         int ret = 0;
6008
6009         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6010                 return 0;
6011         task = _nfs41_proc_sequence(clp, cred);
6012         if (IS_ERR(task))
6013                 ret = PTR_ERR(task);
6014         else
6015                 rpc_put_task_async(task);
6016         dprintk("<-- %s status=%d\n", __func__, ret);
6017         return ret;
6018 }
6019
6020 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6021 {
6022         struct rpc_task *task;
6023         int ret;
6024
6025         task = _nfs41_proc_sequence(clp, cred);
6026         if (IS_ERR(task)) {
6027                 ret = PTR_ERR(task);
6028                 goto out;
6029         }
6030         ret = rpc_wait_for_completion_task(task);
6031         if (!ret) {
6032                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6033
6034                 if (task->tk_status == 0)
6035                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6036                 ret = task->tk_status;
6037         }
6038         rpc_put_task(task);
6039 out:
6040         dprintk("<-- %s status=%d\n", __func__, ret);
6041         return ret;
6042 }
6043
6044 struct nfs4_reclaim_complete_data {
6045         struct nfs_client *clp;
6046         struct nfs41_reclaim_complete_args arg;
6047         struct nfs41_reclaim_complete_res res;
6048 };
6049
6050 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6051 {
6052         struct nfs4_reclaim_complete_data *calldata = data;
6053
6054         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6055         if (nfs41_setup_sequence(calldata->clp->cl_session,
6056                                 &calldata->arg.seq_args,
6057                                 &calldata->res.seq_res, task))
6058                 return;
6059
6060         rpc_call_start(task);
6061 }
6062
6063 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6064 {
6065         switch(task->tk_status) {
6066         case 0:
6067         case -NFS4ERR_COMPLETE_ALREADY:
6068         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6069                 break;
6070         case -NFS4ERR_DELAY:
6071                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6072                 /* fall through */
6073         case -NFS4ERR_RETRY_UNCACHED_REP:
6074                 return -EAGAIN;
6075         default:
6076                 nfs4_schedule_lease_recovery(clp);
6077         }
6078         return 0;
6079 }
6080
6081 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6082 {
6083         struct nfs4_reclaim_complete_data *calldata = data;
6084         struct nfs_client *clp = calldata->clp;
6085         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6086
6087         dprintk("--> %s\n", __func__);
6088         if (!nfs41_sequence_done(task, res))
6089                 return;
6090
6091         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6092                 rpc_restart_call_prepare(task);
6093                 return;
6094         }
6095         dprintk("<-- %s\n", __func__);
6096 }
6097
6098 static void nfs4_free_reclaim_complete_data(void *data)
6099 {
6100         struct nfs4_reclaim_complete_data *calldata = data;
6101
6102         kfree(calldata);
6103 }
6104
6105 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6106         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6107         .rpc_call_done = nfs4_reclaim_complete_done,
6108         .rpc_release = nfs4_free_reclaim_complete_data,
6109 };
6110
6111 /*
6112  * Issue a global reclaim complete.
6113  */
6114 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6115 {
6116         struct nfs4_reclaim_complete_data *calldata;
6117         struct rpc_task *task;
6118         struct rpc_message msg = {
6119                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6120         };
6121         struct rpc_task_setup task_setup_data = {
6122                 .rpc_client = clp->cl_rpcclient,
6123                 .rpc_message = &msg,
6124                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6125                 .flags = RPC_TASK_ASYNC,
6126         };
6127         int status = -ENOMEM;
6128
6129         dprintk("--> %s\n", __func__);
6130         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6131         if (calldata == NULL)
6132                 goto out;
6133         calldata->clp = clp;
6134         calldata->arg.one_fs = 0;
6135
6136         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6137         msg.rpc_argp = &calldata->arg;
6138         msg.rpc_resp = &calldata->res;
6139         task_setup_data.callback_data = calldata;
6140         task = rpc_run_task(&task_setup_data);
6141         if (IS_ERR(task)) {
6142                 status = PTR_ERR(task);
6143                 goto out;
6144         }
6145         status = nfs4_wait_for_completion_rpc_task(task);
6146         if (status == 0)
6147                 status = task->tk_status;
6148         rpc_put_task(task);
6149         return 0;
6150 out:
6151         dprintk("<-- %s status=%d\n", __func__, status);
6152         return status;
6153 }
6154
6155 static void
6156 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6157 {
6158         struct nfs4_layoutget *lgp = calldata;
6159         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6160
6161         dprintk("--> %s\n", __func__);
6162         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6163          * right now covering the LAYOUTGET we are about to send.
6164          * However, that is not so catastrophic, and there seems
6165          * to be no way to prevent it completely.
6166          */
6167         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6168                                 &lgp->res.seq_res, task))
6169                 return;
6170         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6171                                           NFS_I(lgp->args.inode)->layout,
6172                                           lgp->args.ctx->state)) {
6173                 rpc_exit(task, NFS4_OK);
6174                 return;
6175         }
6176         rpc_call_start(task);
6177 }
6178
6179 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6180 {
6181         struct nfs4_layoutget *lgp = calldata;
6182         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6183
6184         dprintk("--> %s\n", __func__);
6185
6186         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6187                 return;
6188
6189         switch (task->tk_status) {
6190         case 0:
6191                 break;
6192         case -NFS4ERR_LAYOUTTRYLATER:
6193         case -NFS4ERR_RECALLCONFLICT:
6194                 task->tk_status = -NFS4ERR_DELAY;
6195                 /* Fall through */
6196         default:
6197                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6198                         rpc_restart_call_prepare(task);
6199                         return;
6200                 }
6201         }
6202         dprintk("<-- %s\n", __func__);
6203 }
6204
6205 static void nfs4_layoutget_release(void *calldata)
6206 {
6207         struct nfs4_layoutget *lgp = calldata;
6208
6209         dprintk("--> %s\n", __func__);
6210         put_nfs_open_context(lgp->args.ctx);
6211         kfree(calldata);
6212         dprintk("<-- %s\n", __func__);
6213 }
6214
6215 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6216         .rpc_call_prepare = nfs4_layoutget_prepare,
6217         .rpc_call_done = nfs4_layoutget_done,
6218         .rpc_release = nfs4_layoutget_release,
6219 };
6220
6221 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
6222 {
6223         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6224         struct rpc_task *task;
6225         struct rpc_message msg = {
6226                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6227                 .rpc_argp = &lgp->args,
6228                 .rpc_resp = &lgp->res,
6229         };
6230         struct rpc_task_setup task_setup_data = {
6231                 .rpc_client = server->client,
6232                 .rpc_message = &msg,
6233                 .callback_ops = &nfs4_layoutget_call_ops,
6234                 .callback_data = lgp,
6235                 .flags = RPC_TASK_ASYNC,
6236         };
6237         int status = 0;
6238
6239         dprintk("--> %s\n", __func__);
6240
6241         lgp->res.layoutp = &lgp->args.layout;
6242         lgp->res.seq_res.sr_slot = NULL;
6243         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6244         task = rpc_run_task(&task_setup_data);
6245         if (IS_ERR(task))
6246                 return PTR_ERR(task);
6247         status = nfs4_wait_for_completion_rpc_task(task);
6248         if (status == 0)
6249                 status = task->tk_status;
6250         if (status == 0)
6251                 status = pnfs_layout_process(lgp);
6252         rpc_put_task(task);
6253         dprintk("<-- %s status=%d\n", __func__, status);
6254         return status;
6255 }
6256
6257 static void
6258 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6259 {
6260         struct nfs4_layoutreturn *lrp = calldata;
6261
6262         dprintk("--> %s\n", __func__);
6263         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6264                                 &lrp->res.seq_res, task))
6265                 return;
6266         rpc_call_start(task);
6267 }
6268
6269 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6270 {
6271         struct nfs4_layoutreturn *lrp = calldata;
6272         struct nfs_server *server;
6273         struct pnfs_layout_hdr *lo = lrp->args.layout;
6274
6275         dprintk("--> %s\n", __func__);
6276
6277         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6278                 return;
6279
6280         server = NFS_SERVER(lrp->args.inode);
6281         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6282                 rpc_restart_call_prepare(task);
6283                 return;
6284         }
6285         spin_lock(&lo->plh_inode->i_lock);
6286         if (task->tk_status == 0) {
6287                 if (lrp->res.lrs_present) {
6288                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6289                 } else
6290                         BUG_ON(!list_empty(&lo->plh_segs));
6291         }
6292         lo->plh_block_lgets--;
6293         spin_unlock(&lo->plh_inode->i_lock);
6294         dprintk("<-- %s\n", __func__);
6295 }
6296
6297 static void nfs4_layoutreturn_release(void *calldata)
6298 {
6299         struct nfs4_layoutreturn *lrp = calldata;
6300
6301         dprintk("--> %s\n", __func__);
6302         put_layout_hdr(lrp->args.layout);
6303         kfree(calldata);
6304         dprintk("<-- %s\n", __func__);
6305 }
6306
6307 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6308         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6309         .rpc_call_done = nfs4_layoutreturn_done,
6310         .rpc_release = nfs4_layoutreturn_release,
6311 };
6312
6313 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6314 {
6315         struct rpc_task *task;
6316         struct rpc_message msg = {
6317                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6318                 .rpc_argp = &lrp->args,
6319                 .rpc_resp = &lrp->res,
6320         };
6321         struct rpc_task_setup task_setup_data = {
6322                 .rpc_client = lrp->clp->cl_rpcclient,
6323                 .rpc_message = &msg,
6324                 .callback_ops = &nfs4_layoutreturn_call_ops,
6325                 .callback_data = lrp,
6326         };
6327         int status;
6328
6329         dprintk("--> %s\n", __func__);
6330         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6331         task = rpc_run_task(&task_setup_data);
6332         if (IS_ERR(task))
6333                 return PTR_ERR(task);
6334         status = task->tk_status;
6335         dprintk("<-- %s status=%d\n", __func__, status);
6336         rpc_put_task(task);
6337         return status;
6338 }
6339
6340 /*
6341  * Retrieve the list of Data Server devices from the MDS.
6342  */
6343 static int _nfs4_getdevicelist(struct nfs_server *server,
6344                                     const struct nfs_fh *fh,
6345                                     struct pnfs_devicelist *devlist)
6346 {
6347         struct nfs4_getdevicelist_args args = {
6348                 .fh = fh,
6349                 .layoutclass = server->pnfs_curr_ld->id,
6350         };
6351         struct nfs4_getdevicelist_res res = {
6352                 .devlist = devlist,
6353         };
6354         struct rpc_message msg = {
6355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6356                 .rpc_argp = &args,
6357                 .rpc_resp = &res,
6358         };
6359         int status;
6360
6361         dprintk("--> %s\n", __func__);
6362         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6363                                 &res.seq_res, 0);
6364         dprintk("<-- %s status=%d\n", __func__, status);
6365         return status;
6366 }
6367
6368 int nfs4_proc_getdevicelist(struct nfs_server *server,
6369                             const struct nfs_fh *fh,
6370                             struct pnfs_devicelist *devlist)
6371 {
6372         struct nfs4_exception exception = { };
6373         int err;
6374
6375         do {
6376                 err = nfs4_handle_exception(server,
6377                                 _nfs4_getdevicelist(server, fh, devlist),
6378                                 &exception);
6379         } while (exception.retry);
6380
6381         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6382                 err, devlist->num_devs);
6383
6384         return err;
6385 }
6386 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6387
6388 static int
6389 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6390 {
6391         struct nfs4_getdeviceinfo_args args = {
6392                 .pdev = pdev,
6393         };
6394         struct nfs4_getdeviceinfo_res res = {
6395                 .pdev = pdev,
6396         };
6397         struct rpc_message msg = {
6398                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6399                 .rpc_argp = &args,
6400                 .rpc_resp = &res,
6401         };
6402         int status;
6403
6404         dprintk("--> %s\n", __func__);
6405         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6406         dprintk("<-- %s status=%d\n", __func__, status);
6407
6408         return status;
6409 }
6410
6411 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6412 {
6413         struct nfs4_exception exception = { };
6414         int err;
6415
6416         do {
6417                 err = nfs4_handle_exception(server,
6418                                         _nfs4_proc_getdeviceinfo(server, pdev),
6419                                         &exception);
6420         } while (exception.retry);
6421         return err;
6422 }
6423 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6424
6425 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6426 {
6427         struct nfs4_layoutcommit_data *data = calldata;
6428         struct nfs_server *server = NFS_SERVER(data->args.inode);
6429
6430         if (nfs4_setup_sequence(server, &data->args.seq_args,
6431                                 &data->res.seq_res, task))
6432                 return;
6433         rpc_call_start(task);
6434 }
6435
6436 static void
6437 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6438 {
6439         struct nfs4_layoutcommit_data *data = calldata;
6440         struct nfs_server *server = NFS_SERVER(data->args.inode);
6441
6442         if (!nfs4_sequence_done(task, &data->res.seq_res))
6443                 return;
6444
6445         switch (task->tk_status) { /* Just ignore these failures */
6446         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6447         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6448         case -NFS4ERR_BADLAYOUT:     /* no layout */
6449         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6450                 task->tk_status = 0;
6451                 break;
6452         case 0:
6453                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6454                                                    data->res.fattr);
6455                 break;
6456         default:
6457                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6458                         rpc_restart_call_prepare(task);
6459                         return;
6460                 }
6461         }
6462 }
6463
6464 static void nfs4_layoutcommit_release(void *calldata)
6465 {
6466         struct nfs4_layoutcommit_data *data = calldata;
6467         struct pnfs_layout_segment *lseg, *tmp;
6468         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6469
6470         pnfs_cleanup_layoutcommit(data);
6471         /* Matched by references in pnfs_set_layoutcommit */
6472         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6473                 list_del_init(&lseg->pls_lc_list);
6474                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6475                                        &lseg->pls_flags))
6476                         put_lseg(lseg);
6477         }
6478
6479         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6480         smp_mb__after_clear_bit();
6481         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6482
6483         put_rpccred(data->cred);
6484         kfree(data);
6485 }
6486
6487 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6488         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6489         .rpc_call_done = nfs4_layoutcommit_done,
6490         .rpc_release = nfs4_layoutcommit_release,
6491 };
6492
6493 int
6494 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6495 {
6496         struct rpc_message msg = {
6497                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6498                 .rpc_argp = &data->args,
6499                 .rpc_resp = &data->res,
6500                 .rpc_cred = data->cred,
6501         };
6502         struct rpc_task_setup task_setup_data = {
6503                 .task = &data->task,
6504                 .rpc_client = NFS_CLIENT(data->args.inode),
6505                 .rpc_message = &msg,
6506                 .callback_ops = &nfs4_layoutcommit_ops,
6507                 .callback_data = data,
6508                 .flags = RPC_TASK_ASYNC,
6509         };
6510         struct rpc_task *task;
6511         int status = 0;
6512
6513         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6514                 "lbw: %llu inode %lu\n",
6515                 data->task.tk_pid, sync,
6516                 data->args.lastbytewritten,
6517                 data->args.inode->i_ino);
6518
6519         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6520         task = rpc_run_task(&task_setup_data);
6521         if (IS_ERR(task))
6522                 return PTR_ERR(task);
6523         if (sync == false)
6524                 goto out;
6525         status = nfs4_wait_for_completion_rpc_task(task);
6526         if (status != 0)
6527                 goto out;
6528         status = task->tk_status;
6529 out:
6530         dprintk("%s: status %d\n", __func__, status);
6531         rpc_put_task(task);
6532         return status;
6533 }
6534
6535 static int
6536 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6537                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6538 {
6539         struct nfs41_secinfo_no_name_args args = {
6540                 .style = SECINFO_STYLE_CURRENT_FH,
6541         };
6542         struct nfs4_secinfo_res res = {
6543                 .flavors = flavors,
6544         };
6545         struct rpc_message msg = {
6546                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6547                 .rpc_argp = &args,
6548                 .rpc_resp = &res,
6549         };
6550         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6551 }
6552
6553 static int
6554 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6555                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6556 {
6557         struct nfs4_exception exception = { };
6558         int err;
6559         do {
6560                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6561                 switch (err) {
6562                 case 0:
6563                 case -NFS4ERR_WRONGSEC:
6564                 case -NFS4ERR_NOTSUPP:
6565                         goto out;
6566                 default:
6567                         err = nfs4_handle_exception(server, err, &exception);
6568                 }
6569         } while (exception.retry);
6570 out:
6571         return err;
6572 }
6573
6574 static int
6575 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6576                     struct nfs_fsinfo *info)
6577 {
6578         int err;
6579         struct page *page;
6580         rpc_authflavor_t flavor;
6581         struct nfs4_secinfo_flavors *flavors;
6582
6583         page = alloc_page(GFP_KERNEL);
6584         if (!page) {
6585                 err = -ENOMEM;
6586                 goto out;
6587         }
6588
6589         flavors = page_address(page);
6590         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6591
6592         /*
6593          * Fall back on "guess and check" method if
6594          * the server doesn't support SECINFO_NO_NAME
6595          */
6596         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6597                 err = nfs4_find_root_sec(server, fhandle, info);
6598                 goto out_freepage;
6599         }
6600         if (err)
6601                 goto out_freepage;
6602
6603         flavor = nfs_find_best_sec(flavors);
6604         if (err == 0)
6605                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6606
6607 out_freepage:
6608         put_page(page);
6609         if (err == -EACCES)
6610                 return -EPERM;
6611 out:
6612         return err;
6613 }
6614
6615 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6616 {
6617         int status;
6618         struct nfs41_test_stateid_args args = {
6619                 .stateid = stateid,
6620         };
6621         struct nfs41_test_stateid_res res;
6622         struct rpc_message msg = {
6623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6624                 .rpc_argp = &args,
6625                 .rpc_resp = &res,
6626         };
6627
6628         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6629         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6630         if (status != NFS_OK)
6631                 return status;
6632         return -res.status;
6633 }
6634
6635 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6636 {
6637         struct nfs4_exception exception = { };
6638         int err;
6639         do {
6640                 err = _nfs41_test_stateid(server, stateid);
6641                 if (err != -NFS4ERR_DELAY)
6642                         break;
6643                 nfs4_handle_exception(server, err, &exception);
6644         } while (exception.retry);
6645         return err;
6646 }
6647
6648 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6649 {
6650         struct nfs41_free_stateid_args args = {
6651                 .stateid = stateid,
6652         };
6653         struct nfs41_free_stateid_res res;
6654         struct rpc_message msg = {
6655                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6656                 .rpc_argp = &args,
6657                 .rpc_resp = &res,
6658         };
6659
6660         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6661         return nfs4_call_sync_sequence(server->client, server, &msg,
6662                                          &args.seq_args, &res.seq_res, 1);
6663 }
6664
6665 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6666 {
6667         struct nfs4_exception exception = { };
6668         int err;
6669         do {
6670                 err = _nfs4_free_stateid(server, stateid);
6671                 if (err != -NFS4ERR_DELAY)
6672                         break;
6673                 nfs4_handle_exception(server, err, &exception);
6674         } while (exception.retry);
6675         return err;
6676 }
6677
6678 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6679                 const nfs4_stateid *s2)
6680 {
6681         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6682                 return false;
6683
6684         if (s1->seqid == s2->seqid)
6685                 return true;
6686         if (s1->seqid == 0 || s2->seqid == 0)
6687                 return true;
6688
6689         return false;
6690 }
6691
6692 #endif /* CONFIG_NFS_V4_1 */
6693
6694 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6695                 const nfs4_stateid *s2)
6696 {
6697         return nfs4_stateid_match(s1, s2);
6698 }
6699
6700
6701 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6702         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6703         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6704         .recover_open   = nfs4_open_reclaim,
6705         .recover_lock   = nfs4_lock_reclaim,
6706         .establish_clid = nfs4_init_clientid,
6707         .get_clid_cred  = nfs4_get_setclientid_cred,
6708 };
6709
6710 #if defined(CONFIG_NFS_V4_1)
6711 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6712         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6713         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6714         .recover_open   = nfs4_open_reclaim,
6715         .recover_lock   = nfs4_lock_reclaim,
6716         .establish_clid = nfs41_init_clientid,
6717         .get_clid_cred  = nfs4_get_exchange_id_cred,
6718         .reclaim_complete = nfs41_proc_reclaim_complete,
6719 };
6720 #endif /* CONFIG_NFS_V4_1 */
6721
6722 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6723         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6724         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6725         .recover_open   = nfs4_open_expired,
6726         .recover_lock   = nfs4_lock_expired,
6727         .establish_clid = nfs4_init_clientid,
6728         .get_clid_cred  = nfs4_get_setclientid_cred,
6729 };
6730
6731 #if defined(CONFIG_NFS_V4_1)
6732 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6733         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6734         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6735         .recover_open   = nfs41_open_expired,
6736         .recover_lock   = nfs41_lock_expired,
6737         .establish_clid = nfs41_init_clientid,
6738         .get_clid_cred  = nfs4_get_exchange_id_cred,
6739 };
6740 #endif /* CONFIG_NFS_V4_1 */
6741
6742 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6743         .sched_state_renewal = nfs4_proc_async_renew,
6744         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6745         .renew_lease = nfs4_proc_renew,
6746 };
6747
6748 #if defined(CONFIG_NFS_V4_1)
6749 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6750         .sched_state_renewal = nfs41_proc_async_sequence,
6751         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6752         .renew_lease = nfs4_proc_sequence,
6753 };
6754 #endif
6755
6756 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6757         .minor_version = 0,
6758         .call_sync = _nfs4_call_sync,
6759         .match_stateid = nfs4_match_stateid,
6760         .find_root_sec = nfs4_find_root_sec,
6761         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6762         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6763         .state_renewal_ops = &nfs40_state_renewal_ops,
6764 };
6765
6766 #if defined(CONFIG_NFS_V4_1)
6767 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6768         .minor_version = 1,
6769         .call_sync = _nfs4_call_sync_session,
6770         .match_stateid = nfs41_match_stateid,
6771         .find_root_sec = nfs41_find_root_sec,
6772         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6773         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6774         .state_renewal_ops = &nfs41_state_renewal_ops,
6775 };
6776 #endif
6777
6778 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6779         [0] = &nfs_v4_0_minor_ops,
6780 #if defined(CONFIG_NFS_V4_1)
6781         [1] = &nfs_v4_1_minor_ops,
6782 #endif
6783 };
6784
6785 static const struct inode_operations nfs4_file_inode_operations = {
6786         .permission     = nfs_permission,
6787         .getattr        = nfs_getattr,
6788         .setattr        = nfs_setattr,
6789         .getxattr       = generic_getxattr,
6790         .setxattr       = generic_setxattr,
6791         .listxattr      = generic_listxattr,
6792         .removexattr    = generic_removexattr,
6793 };
6794
6795 const struct nfs_rpc_ops nfs_v4_clientops = {
6796         .version        = 4,                    /* protocol version */
6797         .dentry_ops     = &nfs4_dentry_operations,
6798         .dir_inode_ops  = &nfs4_dir_inode_operations,
6799         .file_inode_ops = &nfs4_file_inode_operations,
6800         .file_ops       = &nfs4_file_operations,
6801         .getroot        = nfs4_proc_get_root,
6802         .submount       = nfs4_submount,
6803         .getattr        = nfs4_proc_getattr,
6804         .setattr        = nfs4_proc_setattr,
6805         .lookup         = nfs4_proc_lookup,
6806         .access         = nfs4_proc_access,
6807         .readlink       = nfs4_proc_readlink,
6808         .create         = nfs4_proc_create,
6809         .remove         = nfs4_proc_remove,
6810         .unlink_setup   = nfs4_proc_unlink_setup,
6811         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6812         .unlink_done    = nfs4_proc_unlink_done,
6813         .rename         = nfs4_proc_rename,
6814         .rename_setup   = nfs4_proc_rename_setup,
6815         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6816         .rename_done    = nfs4_proc_rename_done,
6817         .link           = nfs4_proc_link,
6818         .symlink        = nfs4_proc_symlink,
6819         .mkdir          = nfs4_proc_mkdir,
6820         .rmdir          = nfs4_proc_remove,
6821         .readdir        = nfs4_proc_readdir,
6822         .mknod          = nfs4_proc_mknod,
6823         .statfs         = nfs4_proc_statfs,
6824         .fsinfo         = nfs4_proc_fsinfo,
6825         .pathconf       = nfs4_proc_pathconf,
6826         .set_capabilities = nfs4_server_capabilities,
6827         .decode_dirent  = nfs4_decode_dirent,
6828         .read_setup     = nfs4_proc_read_setup,
6829         .read_pageio_init = pnfs_pageio_init_read,
6830         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6831         .read_done      = nfs4_read_done,
6832         .write_setup    = nfs4_proc_write_setup,
6833         .write_pageio_init = pnfs_pageio_init_write,
6834         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6835         .write_done     = nfs4_write_done,
6836         .commit_setup   = nfs4_proc_commit_setup,
6837         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6838         .commit_done    = nfs4_commit_done,
6839         .lock           = nfs4_proc_lock,
6840         .clear_acl_cache = nfs4_zap_acl_attr,
6841         .close_context  = nfs4_close_context,
6842         .open_context   = nfs4_atomic_open,
6843         .have_delegation = nfs4_have_delegation,
6844         .return_delegation = nfs4_inode_return_delegation,
6845         .alloc_client   = nfs4_alloc_client,
6846         .init_client    = nfs4_init_client,
6847         .free_client    = nfs4_free_client,
6848 };
6849
6850 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6851         .prefix = XATTR_NAME_NFSV4_ACL,
6852         .list   = nfs4_xattr_list_nfs4_acl,
6853         .get    = nfs4_xattr_get_nfs4_acl,
6854         .set    = nfs4_xattr_set_nfs4_acl,
6855 };
6856
6857 const struct xattr_handler *nfs4_xattr_handlers[] = {
6858         &nfs4_xattr_nfs4_acl_handler,
6859         NULL
6860 };
6861
6862 module_param(max_session_slots, ushort, 0644);
6863 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6864                 "requests the client will negotiate");
6865
6866 /*
6867  * Local variables:
6868  *  c-basic-offset: 8
6869  * End:
6870  */