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 int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1760 {
1761         int status = NFS_OK;
1762         struct nfs_server *server = NFS_SERVER(state->inode);
1763
1764         if (state->flags & flags) {
1765                 status = nfs41_test_stateid(server, stateid);
1766                 if (status != NFS_OK) {
1767                         nfs41_free_stateid(server, stateid);
1768                         state->flags &= ~flags;
1769                 }
1770         }
1771         return status;
1772 }
1773
1774 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1775 {
1776         int deleg_status, open_status;
1777         int deleg_flags = 1 << NFS_DELEGATED_STATE;
1778         int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1779
1780         deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1781         open_status = nfs41_check_expired_stateid(state,  &state->open_stateid, open_flags);
1782
1783         if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1784                 return NFS_OK;
1785         return nfs4_open_expired(sp, state);
1786 }
1787 #endif
1788
1789 /*
1790  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1791  * fields corresponding to attributes that were used to store the verifier.
1792  * Make sure we clobber those fields in the later setattr call
1793  */
1794 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1795 {
1796         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1797             !(sattr->ia_valid & ATTR_ATIME_SET))
1798                 sattr->ia_valid |= ATTR_ATIME;
1799
1800         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1801             !(sattr->ia_valid & ATTR_MTIME_SET))
1802                 sattr->ia_valid |= ATTR_MTIME;
1803 }
1804
1805 /*
1806  * Returns a referenced nfs4_state
1807  */
1808 static int _nfs4_do_open(struct inode *dir,
1809                         struct dentry *dentry,
1810                         fmode_t fmode,
1811                         int flags,
1812                         struct iattr *sattr,
1813                         struct rpc_cred *cred,
1814                         struct nfs4_state **res,
1815                         struct nfs4_threshold **ctx_th)
1816 {
1817         struct nfs4_state_owner  *sp;
1818         struct nfs4_state     *state = NULL;
1819         struct nfs_server       *server = NFS_SERVER(dir);
1820         struct nfs4_opendata *opendata;
1821         int status;
1822
1823         /* Protect against reboot recovery conflicts */
1824         status = -ENOMEM;
1825         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1826         if (sp == NULL) {
1827                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1828                 goto out_err;
1829         }
1830         status = nfs4_recover_expired_lease(server);
1831         if (status != 0)
1832                 goto err_put_state_owner;
1833         if (dentry->d_inode != NULL)
1834                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1835         status = -ENOMEM;
1836         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1837         if (opendata == NULL)
1838                 goto err_put_state_owner;
1839
1840         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1841                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1842                 if (!opendata->f_attr.mdsthreshold)
1843                         goto err_opendata_put;
1844                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1845         }
1846         if (dentry->d_inode != NULL)
1847                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1848
1849         status = _nfs4_proc_open(opendata);
1850         if (status != 0)
1851                 goto err_opendata_put;
1852
1853         state = nfs4_opendata_to_nfs4_state(opendata);
1854         status = PTR_ERR(state);
1855         if (IS_ERR(state))
1856                 goto err_opendata_put;
1857         if (server->caps & NFS_CAP_POSIX_LOCK)
1858                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1859
1860         if (opendata->o_arg.open_flags & O_EXCL) {
1861                 nfs4_exclusive_attrset(opendata, sattr);
1862
1863                 nfs_fattr_init(opendata->o_res.f_attr);
1864                 status = nfs4_do_setattr(state->inode, cred,
1865                                 opendata->o_res.f_attr, sattr,
1866                                 state);
1867                 if (status == 0)
1868                         nfs_setattr_update_inode(state->inode, sattr);
1869                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1870         }
1871
1872         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1873                 *ctx_th = opendata->f_attr.mdsthreshold;
1874         else
1875                 kfree(opendata->f_attr.mdsthreshold);
1876         opendata->f_attr.mdsthreshold = NULL;
1877
1878         nfs4_opendata_put(opendata);
1879         nfs4_put_state_owner(sp);
1880         *res = state;
1881         return 0;
1882 err_opendata_put:
1883         kfree(opendata->f_attr.mdsthreshold);
1884         nfs4_opendata_put(opendata);
1885 err_put_state_owner:
1886         nfs4_put_state_owner(sp);
1887 out_err:
1888         *res = NULL;
1889         return status;
1890 }
1891
1892
1893 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1894                                         struct dentry *dentry,
1895                                         fmode_t fmode,
1896                                         int flags,
1897                                         struct iattr *sattr,
1898                                         struct rpc_cred *cred,
1899                                         struct nfs4_threshold **ctx_th)
1900 {
1901         struct nfs4_exception exception = { };
1902         struct nfs4_state *res;
1903         int status;
1904
1905         fmode &= FMODE_READ|FMODE_WRITE;
1906         do {
1907                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1908                                        &res, ctx_th);
1909                 if (status == 0)
1910                         break;
1911                 /* NOTE: BAD_SEQID means the server and client disagree about the
1912                  * book-keeping w.r.t. state-changing operations
1913                  * (OPEN/CLOSE/LOCK/LOCKU...)
1914                  * It is actually a sign of a bug on the client or on the server.
1915                  *
1916                  * If we receive a BAD_SEQID error in the particular case of
1917                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1918                  * have unhashed the old state_owner for us, and that we can
1919                  * therefore safely retry using a new one. We should still warn
1920                  * the user though...
1921                  */
1922                 if (status == -NFS4ERR_BAD_SEQID) {
1923                         pr_warn_ratelimited("NFS: v4 server %s "
1924                                         " returned a bad sequence-id error!\n",
1925                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1926                         exception.retry = 1;
1927                         continue;
1928                 }
1929                 /*
1930                  * BAD_STATEID on OPEN means that the server cancelled our
1931                  * state before it received the OPEN_CONFIRM.
1932                  * Recover by retrying the request as per the discussion
1933                  * on Page 181 of RFC3530.
1934                  */
1935                 if (status == -NFS4ERR_BAD_STATEID) {
1936                         exception.retry = 1;
1937                         continue;
1938                 }
1939                 if (status == -EAGAIN) {
1940                         /* We must have found a delegation */
1941                         exception.retry = 1;
1942                         continue;
1943                 }
1944                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1945                                         status, &exception));
1946         } while (exception.retry);
1947         return res;
1948 }
1949
1950 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1951                             struct nfs_fattr *fattr, struct iattr *sattr,
1952                             struct nfs4_state *state)
1953 {
1954         struct nfs_server *server = NFS_SERVER(inode);
1955         struct nfs_setattrargs  arg = {
1956                 .fh             = NFS_FH(inode),
1957                 .iap            = sattr,
1958                 .server         = server,
1959                 .bitmask = server->attr_bitmask,
1960         };
1961         struct nfs_setattrres  res = {
1962                 .fattr          = fattr,
1963                 .server         = server,
1964         };
1965         struct rpc_message msg = {
1966                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1967                 .rpc_argp       = &arg,
1968                 .rpc_resp       = &res,
1969                 .rpc_cred       = cred,
1970         };
1971         unsigned long timestamp = jiffies;
1972         int status;
1973
1974         nfs_fattr_init(fattr);
1975
1976         if (state != NULL) {
1977                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1978                                 current->files, current->tgid);
1979         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1980                                 FMODE_WRITE)) {
1981                 /* Use that stateid */
1982         } else
1983                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1984
1985         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1986         if (status == 0 && state != NULL)
1987                 renew_lease(server, timestamp);
1988         return status;
1989 }
1990
1991 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1992                            struct nfs_fattr *fattr, struct iattr *sattr,
1993                            struct nfs4_state *state)
1994 {
1995         struct nfs_server *server = NFS_SERVER(inode);
1996         struct nfs4_exception exception = {
1997                 .state = state,
1998                 .inode = inode,
1999         };
2000         int err;
2001         do {
2002                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2003                 switch (err) {
2004                 case -NFS4ERR_OPENMODE:
2005                         if (state && !(state->state & FMODE_WRITE)) {
2006                                 err = -EBADF;
2007                                 if (sattr->ia_valid & ATTR_OPEN)
2008                                         err = -EACCES;
2009                                 goto out;
2010                         }
2011                 }
2012                 err = nfs4_handle_exception(server, err, &exception);
2013         } while (exception.retry);
2014 out:
2015         return err;
2016 }
2017
2018 struct nfs4_closedata {
2019         struct inode *inode;
2020         struct nfs4_state *state;
2021         struct nfs_closeargs arg;
2022         struct nfs_closeres res;
2023         struct nfs_fattr fattr;
2024         unsigned long timestamp;
2025         bool roc;
2026         u32 roc_barrier;
2027 };
2028
2029 static void nfs4_free_closedata(void *data)
2030 {
2031         struct nfs4_closedata *calldata = data;
2032         struct nfs4_state_owner *sp = calldata->state->owner;
2033         struct super_block *sb = calldata->state->inode->i_sb;
2034
2035         if (calldata->roc)
2036                 pnfs_roc_release(calldata->state->inode);
2037         nfs4_put_open_state(calldata->state);
2038         nfs_free_seqid(calldata->arg.seqid);
2039         nfs4_put_state_owner(sp);
2040         nfs_sb_deactive(sb);
2041         kfree(calldata);
2042 }
2043
2044 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2045                 fmode_t fmode)
2046 {
2047         spin_lock(&state->owner->so_lock);
2048         if (!(fmode & FMODE_READ))
2049                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2050         if (!(fmode & FMODE_WRITE))
2051                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2052         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2053         spin_unlock(&state->owner->so_lock);
2054 }
2055
2056 static void nfs4_close_done(struct rpc_task *task, void *data)
2057 {
2058         struct nfs4_closedata *calldata = data;
2059         struct nfs4_state *state = calldata->state;
2060         struct nfs_server *server = NFS_SERVER(calldata->inode);
2061
2062         dprintk("%s: begin!\n", __func__);
2063         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2064                 return;
2065         /* hmm. we are done with the inode, and in the process of freeing
2066          * the state_owner. we keep this around to process errors
2067          */
2068         switch (task->tk_status) {
2069                 case 0:
2070                         if (calldata->roc)
2071                                 pnfs_roc_set_barrier(state->inode,
2072                                                      calldata->roc_barrier);
2073                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2074                         renew_lease(server, calldata->timestamp);
2075                         nfs4_close_clear_stateid_flags(state,
2076                                         calldata->arg.fmode);
2077                         break;
2078                 case -NFS4ERR_STALE_STATEID:
2079                 case -NFS4ERR_OLD_STATEID:
2080                 case -NFS4ERR_BAD_STATEID:
2081                 case -NFS4ERR_EXPIRED:
2082                         if (calldata->arg.fmode == 0)
2083                                 break;
2084                 default:
2085                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2086                                 rpc_restart_call_prepare(task);
2087         }
2088         nfs_release_seqid(calldata->arg.seqid);
2089         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2090         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2091 }
2092
2093 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2094 {
2095         struct nfs4_closedata *calldata = data;
2096         struct nfs4_state *state = calldata->state;
2097         int call_close = 0;
2098
2099         dprintk("%s: begin!\n", __func__);
2100         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2101                 return;
2102
2103         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2104         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2105         spin_lock(&state->owner->so_lock);
2106         /* Calculate the change in open mode */
2107         if (state->n_rdwr == 0) {
2108                 if (state->n_rdonly == 0) {
2109                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2110                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2111                         calldata->arg.fmode &= ~FMODE_READ;
2112                 }
2113                 if (state->n_wronly == 0) {
2114                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2115                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2116                         calldata->arg.fmode &= ~FMODE_WRITE;
2117                 }
2118         }
2119         spin_unlock(&state->owner->so_lock);
2120
2121         if (!call_close) {
2122                 /* Note: exit _without_ calling nfs4_close_done */
2123                 task->tk_action = NULL;
2124                 goto out;
2125         }
2126
2127         if (calldata->arg.fmode == 0) {
2128                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2129                 if (calldata->roc &&
2130                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2131                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2132                                      task, NULL);
2133                         goto out;
2134                 }
2135         }
2136
2137         nfs_fattr_init(calldata->res.fattr);
2138         calldata->timestamp = jiffies;
2139         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2140                                 &calldata->arg.seq_args,
2141                                 &calldata->res.seq_res,
2142                                 task))
2143                 goto out;
2144         rpc_call_start(task);
2145 out:
2146         dprintk("%s: done!\n", __func__);
2147 }
2148
2149 static const struct rpc_call_ops nfs4_close_ops = {
2150         .rpc_call_prepare = nfs4_close_prepare,
2151         .rpc_call_done = nfs4_close_done,
2152         .rpc_release = nfs4_free_closedata,
2153 };
2154
2155 /*
2156  * It is possible for data to be read/written from a mem-mapped file
2157  * after the sys_close call (which hits the vfs layer as a flush).
2158  * This means that we can't safely call nfsv4 close on a file until
2159  * the inode is cleared. This in turn means that we are not good
2160  * NFSv4 citizens - we do not indicate to the server to update the file's
2161  * share state even when we are done with one of the three share
2162  * stateid's in the inode.
2163  *
2164  * NOTE: Caller must be holding the sp->so_owner semaphore!
2165  */
2166 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2167 {
2168         struct nfs_server *server = NFS_SERVER(state->inode);
2169         struct nfs4_closedata *calldata;
2170         struct nfs4_state_owner *sp = state->owner;
2171         struct rpc_task *task;
2172         struct rpc_message msg = {
2173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2174                 .rpc_cred = state->owner->so_cred,
2175         };
2176         struct rpc_task_setup task_setup_data = {
2177                 .rpc_client = server->client,
2178                 .rpc_message = &msg,
2179                 .callback_ops = &nfs4_close_ops,
2180                 .workqueue = nfsiod_workqueue,
2181                 .flags = RPC_TASK_ASYNC,
2182         };
2183         int status = -ENOMEM;
2184
2185         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2186         if (calldata == NULL)
2187                 goto out;
2188         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2189         calldata->inode = state->inode;
2190         calldata->state = state;
2191         calldata->arg.fh = NFS_FH(state->inode);
2192         calldata->arg.stateid = &state->open_stateid;
2193         /* Serialization for the sequence id */
2194         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2195         if (calldata->arg.seqid == NULL)
2196                 goto out_free_calldata;
2197         calldata->arg.fmode = 0;
2198         calldata->arg.bitmask = server->cache_consistency_bitmask;
2199         calldata->res.fattr = &calldata->fattr;
2200         calldata->res.seqid = calldata->arg.seqid;
2201         calldata->res.server = server;
2202         calldata->roc = roc;
2203         nfs_sb_active(calldata->inode->i_sb);
2204
2205         msg.rpc_argp = &calldata->arg;
2206         msg.rpc_resp = &calldata->res;
2207         task_setup_data.callback_data = calldata;
2208         task = rpc_run_task(&task_setup_data);
2209         if (IS_ERR(task))
2210                 return PTR_ERR(task);
2211         status = 0;
2212         if (wait)
2213                 status = rpc_wait_for_completion_task(task);
2214         rpc_put_task(task);
2215         return status;
2216 out_free_calldata:
2217         kfree(calldata);
2218 out:
2219         if (roc)
2220                 pnfs_roc_release(state->inode);
2221         nfs4_put_open_state(state);
2222         nfs4_put_state_owner(sp);
2223         return status;
2224 }
2225
2226 static struct inode *
2227 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2228 {
2229         struct nfs4_state *state;
2230
2231         /* Protect against concurrent sillydeletes */
2232         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2233                              ctx->cred, &ctx->mdsthreshold);
2234         if (IS_ERR(state))
2235                 return ERR_CAST(state);
2236         ctx->state = state;
2237         return igrab(state->inode);
2238 }
2239
2240 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2241 {
2242         if (ctx->state == NULL)
2243                 return;
2244         if (is_sync)
2245                 nfs4_close_sync(ctx->state, ctx->mode);
2246         else
2247                 nfs4_close_state(ctx->state, ctx->mode);
2248 }
2249
2250 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2251 {
2252         struct nfs4_server_caps_arg args = {
2253                 .fhandle = fhandle,
2254         };
2255         struct nfs4_server_caps_res res = {};
2256         struct rpc_message msg = {
2257                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2258                 .rpc_argp = &args,
2259                 .rpc_resp = &res,
2260         };
2261         int status;
2262
2263         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2264         if (status == 0) {
2265                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2266                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2267                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2268                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2269                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2270                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2271                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2272                         server->caps |= NFS_CAP_ACLS;
2273                 if (res.has_links != 0)
2274                         server->caps |= NFS_CAP_HARDLINKS;
2275                 if (res.has_symlinks != 0)
2276                         server->caps |= NFS_CAP_SYMLINKS;
2277                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2278                         server->caps |= NFS_CAP_FILEID;
2279                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2280                         server->caps |= NFS_CAP_MODE;
2281                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2282                         server->caps |= NFS_CAP_NLINK;
2283                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2284                         server->caps |= NFS_CAP_OWNER;
2285                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2286                         server->caps |= NFS_CAP_OWNER_GROUP;
2287                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2288                         server->caps |= NFS_CAP_ATIME;
2289                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2290                         server->caps |= NFS_CAP_CTIME;
2291                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2292                         server->caps |= NFS_CAP_MTIME;
2293
2294                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2295                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2296                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2297                 server->acl_bitmask = res.acl_bitmask;
2298                 server->fh_expire_type = res.fh_expire_type;
2299         }
2300
2301         return status;
2302 }
2303
2304 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2305 {
2306         struct nfs4_exception exception = { };
2307         int err;
2308         do {
2309                 err = nfs4_handle_exception(server,
2310                                 _nfs4_server_capabilities(server, fhandle),
2311                                 &exception);
2312         } while (exception.retry);
2313         return err;
2314 }
2315
2316 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2317                 struct nfs_fsinfo *info)
2318 {
2319         struct nfs4_lookup_root_arg args = {
2320                 .bitmask = nfs4_fattr_bitmap,
2321         };
2322         struct nfs4_lookup_res res = {
2323                 .server = server,
2324                 .fattr = info->fattr,
2325                 .fh = fhandle,
2326         };
2327         struct rpc_message msg = {
2328                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2329                 .rpc_argp = &args,
2330                 .rpc_resp = &res,
2331         };
2332
2333         nfs_fattr_init(info->fattr);
2334         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2335 }
2336
2337 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2338                 struct nfs_fsinfo *info)
2339 {
2340         struct nfs4_exception exception = { };
2341         int err;
2342         do {
2343                 err = _nfs4_lookup_root(server, fhandle, info);
2344                 switch (err) {
2345                 case 0:
2346                 case -NFS4ERR_WRONGSEC:
2347                         goto out;
2348                 default:
2349                         err = nfs4_handle_exception(server, err, &exception);
2350                 }
2351         } while (exception.retry);
2352 out:
2353         return err;
2354 }
2355
2356 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2357                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2358 {
2359         struct rpc_auth *auth;
2360         int ret;
2361
2362         auth = rpcauth_create(flavor, server->client);
2363         if (!auth) {
2364                 ret = -EIO;
2365                 goto out;
2366         }
2367         ret = nfs4_lookup_root(server, fhandle, info);
2368 out:
2369         return ret;
2370 }
2371
2372 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2373                               struct nfs_fsinfo *info)
2374 {
2375         int i, len, status = 0;
2376         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2377
2378         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2379         flav_array[len] = RPC_AUTH_NULL;
2380         len += 1;
2381
2382         for (i = 0; i < len; i++) {
2383                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2384                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2385                         continue;
2386                 break;
2387         }
2388         /*
2389          * -EACCESS could mean that the user doesn't have correct permissions
2390          * to access the mount.  It could also mean that we tried to mount
2391          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2392          * existing mount programs don't handle -EACCES very well so it should
2393          * be mapped to -EPERM instead.
2394          */
2395         if (status == -EACCES)
2396                 status = -EPERM;
2397         return status;
2398 }
2399
2400 /*
2401  * get the file handle for the "/" directory on the server
2402  */
2403 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2404                          struct nfs_fsinfo *info)
2405 {
2406         int minor_version = server->nfs_client->cl_minorversion;
2407         int status = nfs4_lookup_root(server, fhandle, info);
2408         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2409                 /*
2410                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2411                  * by nfs4_map_errors() as this function exits.
2412                  */
2413                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2414         if (status == 0)
2415                 status = nfs4_server_capabilities(server, fhandle);
2416         if (status == 0)
2417                 status = nfs4_do_fsinfo(server, fhandle, info);
2418         return nfs4_map_errors(status);
2419 }
2420
2421 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2422                               struct nfs_fsinfo *info)
2423 {
2424         int error;
2425         struct nfs_fattr *fattr = info->fattr;
2426
2427         error = nfs4_server_capabilities(server, mntfh);
2428         if (error < 0) {
2429                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2430                 return error;
2431         }
2432
2433         error = nfs4_proc_getattr(server, mntfh, fattr);
2434         if (error < 0) {
2435                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2436                 return error;
2437         }
2438
2439         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2440             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2441                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2442
2443         return error;
2444 }
2445
2446 /*
2447  * Get locations and (maybe) other attributes of a referral.
2448  * Note that we'll actually follow the referral later when
2449  * we detect fsid mismatch in inode revalidation
2450  */
2451 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2452                              const struct qstr *name, struct nfs_fattr *fattr,
2453                              struct nfs_fh *fhandle)
2454 {
2455         int status = -ENOMEM;
2456         struct page *page = NULL;
2457         struct nfs4_fs_locations *locations = NULL;
2458
2459         page = alloc_page(GFP_KERNEL);
2460         if (page == NULL)
2461                 goto out;
2462         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2463         if (locations == NULL)
2464                 goto out;
2465
2466         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2467         if (status != 0)
2468                 goto out;
2469         /* Make sure server returned a different fsid for the referral */
2470         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2471                 dprintk("%s: server did not return a different fsid for"
2472                         " a referral at %s\n", __func__, name->name);
2473                 status = -EIO;
2474                 goto out;
2475         }
2476         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2477         nfs_fixup_referral_attributes(&locations->fattr);
2478
2479         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2480         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2481         memset(fhandle, 0, sizeof(struct nfs_fh));
2482 out:
2483         if (page)
2484                 __free_page(page);
2485         kfree(locations);
2486         return status;
2487 }
2488
2489 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2490 {
2491         struct nfs4_getattr_arg args = {
2492                 .fh = fhandle,
2493                 .bitmask = server->attr_bitmask,
2494         };
2495         struct nfs4_getattr_res res = {
2496                 .fattr = fattr,
2497                 .server = server,
2498         };
2499         struct rpc_message msg = {
2500                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2501                 .rpc_argp = &args,
2502                 .rpc_resp = &res,
2503         };
2504
2505         nfs_fattr_init(fattr);
2506         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2507 }
2508
2509 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2510 {
2511         struct nfs4_exception exception = { };
2512         int err;
2513         do {
2514                 err = nfs4_handle_exception(server,
2515                                 _nfs4_proc_getattr(server, fhandle, fattr),
2516                                 &exception);
2517         } while (exception.retry);
2518         return err;
2519 }
2520
2521 /*
2522  * The file is not closed if it is opened due to the a request to change
2523  * the size of the file. The open call will not be needed once the
2524  * VFS layer lookup-intents are implemented.
2525  *
2526  * Close is called when the inode is destroyed.
2527  * If we haven't opened the file for O_WRONLY, we
2528  * need to in the size_change case to obtain a stateid.
2529  *
2530  * Got race?
2531  * Because OPEN is always done by name in nfsv4, it is
2532  * possible that we opened a different file by the same
2533  * name.  We can recognize this race condition, but we
2534  * can't do anything about it besides returning an error.
2535  *
2536  * This will be fixed with VFS changes (lookup-intent).
2537  */
2538 static int
2539 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2540                   struct iattr *sattr)
2541 {
2542         struct inode *inode = dentry->d_inode;
2543         struct rpc_cred *cred = NULL;
2544         struct nfs4_state *state = NULL;
2545         int status;
2546
2547         if (pnfs_ld_layoutret_on_setattr(inode))
2548                 pnfs_return_layout(inode);
2549
2550         nfs_fattr_init(fattr);
2551
2552         /* Deal with open(O_TRUNC) */
2553         if (sattr->ia_valid & ATTR_OPEN)
2554                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2555
2556         /* Optimization: if the end result is no change, don't RPC */
2557         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2558                 return 0;
2559
2560         /* Search for an existing open(O_WRITE) file */
2561         if (sattr->ia_valid & ATTR_FILE) {
2562                 struct nfs_open_context *ctx;
2563
2564                 ctx = nfs_file_open_context(sattr->ia_file);
2565                 if (ctx) {
2566                         cred = ctx->cred;
2567                         state = ctx->state;
2568                 }
2569         }
2570
2571         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2572         if (status == 0)
2573                 nfs_setattr_update_inode(inode, sattr);
2574         return status;
2575 }
2576
2577 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2578                 const struct qstr *name, struct nfs_fh *fhandle,
2579                 struct nfs_fattr *fattr)
2580 {
2581         struct nfs_server *server = NFS_SERVER(dir);
2582         int                    status;
2583         struct nfs4_lookup_arg args = {
2584                 .bitmask = server->attr_bitmask,
2585                 .dir_fh = NFS_FH(dir),
2586                 .name = name,
2587         };
2588         struct nfs4_lookup_res res = {
2589                 .server = server,
2590                 .fattr = fattr,
2591                 .fh = fhandle,
2592         };
2593         struct rpc_message msg = {
2594                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2595                 .rpc_argp = &args,
2596                 .rpc_resp = &res,
2597         };
2598
2599         nfs_fattr_init(fattr);
2600
2601         dprintk("NFS call  lookup %s\n", name->name);
2602         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2603         dprintk("NFS reply lookup: %d\n", status);
2604         return status;
2605 }
2606
2607 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2608 {
2609         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2610                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2611         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2612         fattr->nlink = 2;
2613 }
2614
2615 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2616                                    struct qstr *name, struct nfs_fh *fhandle,
2617                                    struct nfs_fattr *fattr)
2618 {
2619         struct nfs4_exception exception = { };
2620         struct rpc_clnt *client = *clnt;
2621         int err;
2622         do {
2623                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2624                 switch (err) {
2625                 case -NFS4ERR_BADNAME:
2626                         err = -ENOENT;
2627                         goto out;
2628                 case -NFS4ERR_MOVED:
2629                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2630                         goto out;
2631                 case -NFS4ERR_WRONGSEC:
2632                         err = -EPERM;
2633                         if (client != *clnt)
2634                                 goto out;
2635
2636                         client = nfs4_create_sec_client(client, dir, name);
2637                         if (IS_ERR(client))
2638                                 return PTR_ERR(client);
2639
2640                         exception.retry = 1;
2641                         break;
2642                 default:
2643                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2644                 }
2645         } while (exception.retry);
2646
2647 out:
2648         if (err == 0)
2649                 *clnt = client;
2650         else if (client != *clnt)
2651                 rpc_shutdown_client(client);
2652
2653         return err;
2654 }
2655
2656 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2657                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2658 {
2659         int status;
2660         struct rpc_clnt *client = NFS_CLIENT(dir);
2661
2662         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2663         if (client != NFS_CLIENT(dir)) {
2664                 rpc_shutdown_client(client);
2665                 nfs_fixup_secinfo_attributes(fattr);
2666         }
2667         return status;
2668 }
2669
2670 struct rpc_clnt *
2671 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2672                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2673 {
2674         int status;
2675         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2676
2677         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2678         if (status < 0) {
2679                 rpc_shutdown_client(client);
2680                 return ERR_PTR(status);
2681         }
2682         return client;
2683 }
2684
2685 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2686 {
2687         struct nfs_server *server = NFS_SERVER(inode);
2688         struct nfs4_accessargs args = {
2689                 .fh = NFS_FH(inode),
2690                 .bitmask = server->cache_consistency_bitmask,
2691         };
2692         struct nfs4_accessres res = {
2693                 .server = server,
2694         };
2695         struct rpc_message msg = {
2696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2697                 .rpc_argp = &args,
2698                 .rpc_resp = &res,
2699                 .rpc_cred = entry->cred,
2700         };
2701         int mode = entry->mask;
2702         int status;
2703
2704         /*
2705          * Determine which access bits we want to ask for...
2706          */
2707         if (mode & MAY_READ)
2708                 args.access |= NFS4_ACCESS_READ;
2709         if (S_ISDIR(inode->i_mode)) {
2710                 if (mode & MAY_WRITE)
2711                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2712                 if (mode & MAY_EXEC)
2713                         args.access |= NFS4_ACCESS_LOOKUP;
2714         } else {
2715                 if (mode & MAY_WRITE)
2716                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2717                 if (mode & MAY_EXEC)
2718                         args.access |= NFS4_ACCESS_EXECUTE;
2719         }
2720
2721         res.fattr = nfs_alloc_fattr();
2722         if (res.fattr == NULL)
2723                 return -ENOMEM;
2724
2725         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2726         if (!status) {
2727                 entry->mask = 0;
2728                 if (res.access & NFS4_ACCESS_READ)
2729                         entry->mask |= MAY_READ;
2730                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2731                         entry->mask |= MAY_WRITE;
2732                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2733                         entry->mask |= MAY_EXEC;
2734                 nfs_refresh_inode(inode, res.fattr);
2735         }
2736         nfs_free_fattr(res.fattr);
2737         return status;
2738 }
2739
2740 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2741 {
2742         struct nfs4_exception exception = { };
2743         int err;
2744         do {
2745                 err = nfs4_handle_exception(NFS_SERVER(inode),
2746                                 _nfs4_proc_access(inode, entry),
2747                                 &exception);
2748         } while (exception.retry);
2749         return err;
2750 }
2751
2752 /*
2753  * TODO: For the time being, we don't try to get any attributes
2754  * along with any of the zero-copy operations READ, READDIR,
2755  * READLINK, WRITE.
2756  *
2757  * In the case of the first three, we want to put the GETATTR
2758  * after the read-type operation -- this is because it is hard
2759  * to predict the length of a GETATTR response in v4, and thus
2760  * align the READ data correctly.  This means that the GETATTR
2761  * may end up partially falling into the page cache, and we should
2762  * shift it into the 'tail' of the xdr_buf before processing.
2763  * To do this efficiently, we need to know the total length
2764  * of data received, which doesn't seem to be available outside
2765  * of the RPC layer.
2766  *
2767  * In the case of WRITE, we also want to put the GETATTR after
2768  * the operation -- in this case because we want to make sure
2769  * we get the post-operation mtime and size.
2770  *
2771  * Both of these changes to the XDR layer would in fact be quite
2772  * minor, but I decided to leave them for a subsequent patch.
2773  */
2774 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2775                 unsigned int pgbase, unsigned int pglen)
2776 {
2777         struct nfs4_readlink args = {
2778                 .fh       = NFS_FH(inode),
2779                 .pgbase   = pgbase,
2780                 .pglen    = pglen,
2781                 .pages    = &page,
2782         };
2783         struct nfs4_readlink_res res;
2784         struct rpc_message msg = {
2785                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2786                 .rpc_argp = &args,
2787                 .rpc_resp = &res,
2788         };
2789
2790         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2791 }
2792
2793 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2794                 unsigned int pgbase, unsigned int pglen)
2795 {
2796         struct nfs4_exception exception = { };
2797         int err;
2798         do {
2799                 err = nfs4_handle_exception(NFS_SERVER(inode),
2800                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2801                                 &exception);
2802         } while (exception.retry);
2803         return err;
2804 }
2805
2806 /*
2807  * Got race?
2808  * We will need to arrange for the VFS layer to provide an atomic open.
2809  * Until then, this create/open method is prone to inefficiency and race
2810  * conditions due to the lookup, create, and open VFS calls from sys_open()
2811  * placed on the wire.
2812  *
2813  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2814  * The file will be opened again in the subsequent VFS open call
2815  * (nfs4_proc_file_open).
2816  *
2817  * The open for read will just hang around to be used by any process that
2818  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2819  */
2820
2821 static int
2822 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2823                  int flags, struct nfs_open_context *ctx)
2824 {
2825         struct dentry *de = dentry;
2826         struct nfs4_state *state;
2827         struct rpc_cred *cred = NULL;
2828         struct nfs4_threshold **thp = NULL;
2829         fmode_t fmode = 0;
2830         int status = 0;
2831
2832         if (ctx != NULL) {
2833                 cred = ctx->cred;
2834                 de = ctx->dentry;
2835                 fmode = ctx->mode;
2836                 thp = &ctx->mdsthreshold;
2837         }
2838         sattr->ia_mode &= ~current_umask();
2839         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred, thp);
2840         d_drop(dentry);
2841         if (IS_ERR(state)) {
2842                 status = PTR_ERR(state);
2843                 goto out;
2844         }
2845         d_add(dentry, igrab(state->inode));
2846         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2847         if (ctx != NULL)
2848                 ctx->state = state;
2849         else
2850                 nfs4_close_sync(state, fmode);
2851 out:
2852         return status;
2853 }
2854
2855 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2856 {
2857         struct nfs_server *server = NFS_SERVER(dir);
2858         struct nfs_removeargs args = {
2859                 .fh = NFS_FH(dir),
2860                 .name = *name,
2861         };
2862         struct nfs_removeres res = {
2863                 .server = server,
2864         };
2865         struct rpc_message msg = {
2866                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2867                 .rpc_argp = &args,
2868                 .rpc_resp = &res,
2869         };
2870         int status;
2871
2872         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2873         if (status == 0)
2874                 update_changeattr(dir, &res.cinfo);
2875         return status;
2876 }
2877
2878 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2879 {
2880         struct nfs4_exception exception = { };
2881         int err;
2882         do {
2883                 err = nfs4_handle_exception(NFS_SERVER(dir),
2884                                 _nfs4_proc_remove(dir, name),
2885                                 &exception);
2886         } while (exception.retry);
2887         return err;
2888 }
2889
2890 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2891 {
2892         struct nfs_server *server = NFS_SERVER(dir);
2893         struct nfs_removeargs *args = msg->rpc_argp;
2894         struct nfs_removeres *res = msg->rpc_resp;
2895
2896         res->server = server;
2897         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2898         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2899 }
2900
2901 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2902 {
2903         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2904                                 &data->args.seq_args,
2905                                 &data->res.seq_res,
2906                                 task))
2907                 return;
2908         rpc_call_start(task);
2909 }
2910
2911 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2912 {
2913         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2914
2915         if (!nfs4_sequence_done(task, &res->seq_res))
2916                 return 0;
2917         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2918                 return 0;
2919         update_changeattr(dir, &res->cinfo);
2920         return 1;
2921 }
2922
2923 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2924 {
2925         struct nfs_server *server = NFS_SERVER(dir);
2926         struct nfs_renameargs *arg = msg->rpc_argp;
2927         struct nfs_renameres *res = msg->rpc_resp;
2928
2929         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2930         res->server = server;
2931         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2932 }
2933
2934 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2935 {
2936         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2937                                 &data->args.seq_args,
2938                                 &data->res.seq_res,
2939                                 task))
2940                 return;
2941         rpc_call_start(task);
2942 }
2943
2944 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2945                                  struct inode *new_dir)
2946 {
2947         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2948
2949         if (!nfs4_sequence_done(task, &res->seq_res))
2950                 return 0;
2951         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2952                 return 0;
2953
2954         update_changeattr(old_dir, &res->old_cinfo);
2955         update_changeattr(new_dir, &res->new_cinfo);
2956         return 1;
2957 }
2958
2959 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2960                 struct inode *new_dir, struct qstr *new_name)
2961 {
2962         struct nfs_server *server = NFS_SERVER(old_dir);
2963         struct nfs_renameargs arg = {
2964                 .old_dir = NFS_FH(old_dir),
2965                 .new_dir = NFS_FH(new_dir),
2966                 .old_name = old_name,
2967                 .new_name = new_name,
2968         };
2969         struct nfs_renameres res = {
2970                 .server = server,
2971         };
2972         struct rpc_message msg = {
2973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2974                 .rpc_argp = &arg,
2975                 .rpc_resp = &res,
2976         };
2977         int status = -ENOMEM;
2978
2979         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2980         if (!status) {
2981                 update_changeattr(old_dir, &res.old_cinfo);
2982                 update_changeattr(new_dir, &res.new_cinfo);
2983         }
2984         return status;
2985 }
2986
2987 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2988                 struct inode *new_dir, struct qstr *new_name)
2989 {
2990         struct nfs4_exception exception = { };
2991         int err;
2992         do {
2993                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2994                                 _nfs4_proc_rename(old_dir, old_name,
2995                                         new_dir, new_name),
2996                                 &exception);
2997         } while (exception.retry);
2998         return err;
2999 }
3000
3001 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3002 {
3003         struct nfs_server *server = NFS_SERVER(inode);
3004         struct nfs4_link_arg arg = {
3005                 .fh     = NFS_FH(inode),
3006                 .dir_fh = NFS_FH(dir),
3007                 .name   = name,
3008                 .bitmask = server->attr_bitmask,
3009         };
3010         struct nfs4_link_res res = {
3011                 .server = server,
3012         };
3013         struct rpc_message msg = {
3014                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3015                 .rpc_argp = &arg,
3016                 .rpc_resp = &res,
3017         };
3018         int status = -ENOMEM;
3019
3020         res.fattr = nfs_alloc_fattr();
3021         if (res.fattr == NULL)
3022                 goto out;
3023
3024         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3025         if (!status) {
3026                 update_changeattr(dir, &res.cinfo);
3027                 nfs_post_op_update_inode(inode, res.fattr);
3028         }
3029 out:
3030         nfs_free_fattr(res.fattr);
3031         return status;
3032 }
3033
3034 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3035 {
3036         struct nfs4_exception exception = { };
3037         int err;
3038         do {
3039                 err = nfs4_handle_exception(NFS_SERVER(inode),
3040                                 _nfs4_proc_link(inode, dir, name),
3041                                 &exception);
3042         } while (exception.retry);
3043         return err;
3044 }
3045
3046 struct nfs4_createdata {
3047         struct rpc_message msg;
3048         struct nfs4_create_arg arg;
3049         struct nfs4_create_res res;
3050         struct nfs_fh fh;
3051         struct nfs_fattr fattr;
3052 };
3053
3054 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3055                 struct qstr *name, struct iattr *sattr, u32 ftype)
3056 {
3057         struct nfs4_createdata *data;
3058
3059         data = kzalloc(sizeof(*data), GFP_KERNEL);
3060         if (data != NULL) {
3061                 struct nfs_server *server = NFS_SERVER(dir);
3062
3063                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3064                 data->msg.rpc_argp = &data->arg;
3065                 data->msg.rpc_resp = &data->res;
3066                 data->arg.dir_fh = NFS_FH(dir);
3067                 data->arg.server = server;
3068                 data->arg.name = name;
3069                 data->arg.attrs = sattr;
3070                 data->arg.ftype = ftype;
3071                 data->arg.bitmask = server->attr_bitmask;
3072                 data->res.server = server;
3073                 data->res.fh = &data->fh;
3074                 data->res.fattr = &data->fattr;
3075                 nfs_fattr_init(data->res.fattr);
3076         }
3077         return data;
3078 }
3079
3080 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3081 {
3082         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3083                                     &data->arg.seq_args, &data->res.seq_res, 1);
3084         if (status == 0) {
3085                 update_changeattr(dir, &data->res.dir_cinfo);
3086                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3087         }
3088         return status;
3089 }
3090
3091 static void nfs4_free_createdata(struct nfs4_createdata *data)
3092 {
3093         kfree(data);
3094 }
3095
3096 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3097                 struct page *page, unsigned int len, struct iattr *sattr)
3098 {
3099         struct nfs4_createdata *data;
3100         int status = -ENAMETOOLONG;
3101
3102         if (len > NFS4_MAXPATHLEN)
3103                 goto out;
3104
3105         status = -ENOMEM;
3106         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3107         if (data == NULL)
3108                 goto out;
3109
3110         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3111         data->arg.u.symlink.pages = &page;
3112         data->arg.u.symlink.len = len;
3113
3114         status = nfs4_do_create(dir, dentry, data);
3115
3116         nfs4_free_createdata(data);
3117 out:
3118         return status;
3119 }
3120
3121 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3122                 struct page *page, unsigned int len, struct iattr *sattr)
3123 {
3124         struct nfs4_exception exception = { };
3125         int err;
3126         do {
3127                 err = nfs4_handle_exception(NFS_SERVER(dir),
3128                                 _nfs4_proc_symlink(dir, dentry, page,
3129                                                         len, sattr),
3130                                 &exception);
3131         } while (exception.retry);
3132         return err;
3133 }
3134
3135 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3136                 struct iattr *sattr)
3137 {
3138         struct nfs4_createdata *data;
3139         int status = -ENOMEM;
3140
3141         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3142         if (data == NULL)
3143                 goto out;
3144
3145         status = nfs4_do_create(dir, dentry, data);
3146
3147         nfs4_free_createdata(data);
3148 out:
3149         return status;
3150 }
3151
3152 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3153                 struct iattr *sattr)
3154 {
3155         struct nfs4_exception exception = { };
3156         int err;
3157
3158         sattr->ia_mode &= ~current_umask();
3159         do {
3160                 err = nfs4_handle_exception(NFS_SERVER(dir),
3161                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3162                                 &exception);
3163         } while (exception.retry);
3164         return err;
3165 }
3166
3167 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3168                 u64 cookie, struct page **pages, unsigned int count, int plus)
3169 {
3170         struct inode            *dir = dentry->d_inode;
3171         struct nfs4_readdir_arg args = {
3172                 .fh = NFS_FH(dir),
3173                 .pages = pages,
3174                 .pgbase = 0,
3175                 .count = count,
3176                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3177                 .plus = plus,
3178         };
3179         struct nfs4_readdir_res res;
3180         struct rpc_message msg = {
3181                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3182                 .rpc_argp = &args,
3183                 .rpc_resp = &res,
3184                 .rpc_cred = cred,
3185         };
3186         int                     status;
3187
3188         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3189                         dentry->d_parent->d_name.name,
3190                         dentry->d_name.name,
3191                         (unsigned long long)cookie);
3192         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3193         res.pgbase = args.pgbase;
3194         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3195         if (status >= 0) {
3196                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3197                 status += args.pgbase;
3198         }
3199
3200         nfs_invalidate_atime(dir);
3201
3202         dprintk("%s: returns %d\n", __func__, status);
3203         return status;
3204 }
3205
3206 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3207                 u64 cookie, struct page **pages, unsigned int count, int plus)
3208 {
3209         struct nfs4_exception exception = { };
3210         int err;
3211         do {
3212                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3213                                 _nfs4_proc_readdir(dentry, cred, cookie,
3214                                         pages, count, plus),
3215                                 &exception);
3216         } while (exception.retry);
3217         return err;
3218 }
3219
3220 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3221                 struct iattr *sattr, dev_t rdev)
3222 {
3223         struct nfs4_createdata *data;
3224         int mode = sattr->ia_mode;
3225         int status = -ENOMEM;
3226
3227         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3228         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3229
3230         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3231         if (data == NULL)
3232                 goto out;
3233
3234         if (S_ISFIFO(mode))
3235                 data->arg.ftype = NF4FIFO;
3236         else if (S_ISBLK(mode)) {
3237                 data->arg.ftype = NF4BLK;
3238                 data->arg.u.device.specdata1 = MAJOR(rdev);
3239                 data->arg.u.device.specdata2 = MINOR(rdev);
3240         }
3241         else if (S_ISCHR(mode)) {
3242                 data->arg.ftype = NF4CHR;
3243                 data->arg.u.device.specdata1 = MAJOR(rdev);
3244                 data->arg.u.device.specdata2 = MINOR(rdev);
3245         }
3246
3247         status = nfs4_do_create(dir, dentry, data);
3248
3249         nfs4_free_createdata(data);
3250 out:
3251         return status;
3252 }
3253
3254 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3255                 struct iattr *sattr, dev_t rdev)
3256 {
3257         struct nfs4_exception exception = { };
3258         int err;
3259
3260         sattr->ia_mode &= ~current_umask();
3261         do {
3262                 err = nfs4_handle_exception(NFS_SERVER(dir),
3263                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3264                                 &exception);
3265         } while (exception.retry);
3266         return err;
3267 }
3268
3269 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3270                  struct nfs_fsstat *fsstat)
3271 {
3272         struct nfs4_statfs_arg args = {
3273                 .fh = fhandle,
3274                 .bitmask = server->attr_bitmask,
3275         };
3276         struct nfs4_statfs_res res = {
3277                 .fsstat = fsstat,
3278         };
3279         struct rpc_message msg = {
3280                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3281                 .rpc_argp = &args,
3282                 .rpc_resp = &res,
3283         };
3284
3285         nfs_fattr_init(fsstat->fattr);
3286         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3287 }
3288
3289 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3290 {
3291         struct nfs4_exception exception = { };
3292         int err;
3293         do {
3294                 err = nfs4_handle_exception(server,
3295                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3296                                 &exception);
3297         } while (exception.retry);
3298         return err;
3299 }
3300
3301 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3302                 struct nfs_fsinfo *fsinfo)
3303 {
3304         struct nfs4_fsinfo_arg args = {
3305                 .fh = fhandle,
3306                 .bitmask = server->attr_bitmask,
3307         };
3308         struct nfs4_fsinfo_res res = {
3309                 .fsinfo = fsinfo,
3310         };
3311         struct rpc_message msg = {
3312                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3313                 .rpc_argp = &args,
3314                 .rpc_resp = &res,
3315         };
3316
3317         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3318 }
3319
3320 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3321 {
3322         struct nfs4_exception exception = { };
3323         int err;
3324
3325         do {
3326                 err = nfs4_handle_exception(server,
3327                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3328                                 &exception);
3329         } while (exception.retry);
3330         return err;
3331 }
3332
3333 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3334 {
3335         int error;
3336
3337         nfs_fattr_init(fsinfo->fattr);
3338         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3339         if (error == 0)
3340                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3341
3342         return error;
3343 }
3344
3345 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3346                 struct nfs_pathconf *pathconf)
3347 {
3348         struct nfs4_pathconf_arg args = {
3349                 .fh = fhandle,
3350                 .bitmask = server->attr_bitmask,
3351         };
3352         struct nfs4_pathconf_res res = {
3353                 .pathconf = pathconf,
3354         };
3355         struct rpc_message msg = {
3356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3357                 .rpc_argp = &args,
3358                 .rpc_resp = &res,
3359         };
3360
3361         /* None of the pathconf attributes are mandatory to implement */
3362         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3363                 memset(pathconf, 0, sizeof(*pathconf));
3364                 return 0;
3365         }
3366
3367         nfs_fattr_init(pathconf->fattr);
3368         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3369 }
3370
3371 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3372                 struct nfs_pathconf *pathconf)
3373 {
3374         struct nfs4_exception exception = { };
3375         int err;
3376
3377         do {
3378                 err = nfs4_handle_exception(server,
3379                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3380                                 &exception);
3381         } while (exception.retry);
3382         return err;
3383 }
3384
3385 void __nfs4_read_done_cb(struct nfs_read_data *data)
3386 {
3387         nfs_invalidate_atime(data->header->inode);
3388 }
3389
3390 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3391 {
3392         struct nfs_server *server = NFS_SERVER(data->header->inode);
3393
3394         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3395                 rpc_restart_call_prepare(task);
3396                 return -EAGAIN;
3397         }
3398
3399         __nfs4_read_done_cb(data);
3400         if (task->tk_status > 0)
3401                 renew_lease(server, data->timestamp);
3402         return 0;
3403 }
3404
3405 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3406 {
3407
3408         dprintk("--> %s\n", __func__);
3409
3410         if (!nfs4_sequence_done(task, &data->res.seq_res))
3411                 return -EAGAIN;
3412
3413         return data->read_done_cb ? data->read_done_cb(task, data) :
3414                                     nfs4_read_done_cb(task, data);
3415 }
3416
3417 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3418 {
3419         data->timestamp   = jiffies;
3420         data->read_done_cb = nfs4_read_done_cb;
3421         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3422         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3423 }
3424
3425 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3426 {
3427         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3428                                 &data->args.seq_args,
3429                                 &data->res.seq_res,
3430                                 task))
3431                 return;
3432         rpc_call_start(task);
3433 }
3434
3435 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3436 {
3437         struct inode *inode = data->header->inode;
3438
3439         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3440                 rpc_restart_call_prepare(task);
3441                 return -EAGAIN;
3442         }
3443         if (task->tk_status >= 0) {
3444                 renew_lease(NFS_SERVER(inode), data->timestamp);
3445                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3446         }
3447         return 0;
3448 }
3449
3450 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3451 {
3452         if (!nfs4_sequence_done(task, &data->res.seq_res))
3453                 return -EAGAIN;
3454         return data->write_done_cb ? data->write_done_cb(task, data) :
3455                 nfs4_write_done_cb(task, data);
3456 }
3457
3458 static
3459 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3460 {
3461         const struct nfs_pgio_header *hdr = data->header;
3462
3463         /* Don't request attributes for pNFS or O_DIRECT writes */
3464         if (data->ds_clp != NULL || hdr->dreq != NULL)
3465                 return false;
3466         /* Otherwise, request attributes if and only if we don't hold
3467          * a delegation
3468          */
3469         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3470 }
3471
3472 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3473 {
3474         struct nfs_server *server = NFS_SERVER(data->header->inode);
3475
3476         if (!nfs4_write_need_cache_consistency_data(data)) {
3477                 data->args.bitmask = NULL;
3478                 data->res.fattr = NULL;
3479         } else
3480                 data->args.bitmask = server->cache_consistency_bitmask;
3481
3482         if (!data->write_done_cb)
3483                 data->write_done_cb = nfs4_write_done_cb;
3484         data->res.server = server;
3485         data->timestamp   = jiffies;
3486
3487         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3488         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3489 }
3490
3491 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3492 {
3493         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3494                                 &data->args.seq_args,
3495                                 &data->res.seq_res,
3496                                 task))
3497                 return;
3498         rpc_call_start(task);
3499 }
3500
3501 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3502 {
3503         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3504                                 &data->args.seq_args,
3505                                 &data->res.seq_res,
3506                                 task))
3507                 return;
3508         rpc_call_start(task);
3509 }
3510
3511 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3512 {
3513         struct inode *inode = data->inode;
3514
3515         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3516                 rpc_restart_call_prepare(task);
3517                 return -EAGAIN;
3518         }
3519         return 0;
3520 }
3521
3522 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3523 {
3524         if (!nfs4_sequence_done(task, &data->res.seq_res))
3525                 return -EAGAIN;
3526         return data->commit_done_cb(task, data);
3527 }
3528
3529 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3530 {
3531         struct nfs_server *server = NFS_SERVER(data->inode);
3532
3533         if (data->commit_done_cb == NULL)
3534                 data->commit_done_cb = nfs4_commit_done_cb;
3535         data->res.server = server;
3536         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3537         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3538 }
3539
3540 struct nfs4_renewdata {
3541         struct nfs_client       *client;
3542         unsigned long           timestamp;
3543 };
3544
3545 /*
3546  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3547  * standalone procedure for queueing an asynchronous RENEW.
3548  */
3549 static void nfs4_renew_release(void *calldata)
3550 {
3551         struct nfs4_renewdata *data = calldata;
3552         struct nfs_client *clp = data->client;
3553
3554         if (atomic_read(&clp->cl_count) > 1)
3555                 nfs4_schedule_state_renewal(clp);
3556         nfs_put_client(clp);
3557         kfree(data);
3558 }
3559
3560 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3561 {
3562         struct nfs4_renewdata *data = calldata;
3563         struct nfs_client *clp = data->client;
3564         unsigned long timestamp = data->timestamp;
3565
3566         if (task->tk_status < 0) {
3567                 /* Unless we're shutting down, schedule state recovery! */
3568                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3569                         return;
3570                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3571                         nfs4_schedule_lease_recovery(clp);
3572                         return;
3573                 }
3574                 nfs4_schedule_path_down_recovery(clp);
3575         }
3576         do_renew_lease(clp, timestamp);
3577 }
3578
3579 static const struct rpc_call_ops nfs4_renew_ops = {
3580         .rpc_call_done = nfs4_renew_done,
3581         .rpc_release = nfs4_renew_release,
3582 };
3583
3584 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3585 {
3586         struct rpc_message msg = {
3587                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3588                 .rpc_argp       = clp,
3589                 .rpc_cred       = cred,
3590         };
3591         struct nfs4_renewdata *data;
3592
3593         if (renew_flags == 0)
3594                 return 0;
3595         if (!atomic_inc_not_zero(&clp->cl_count))
3596                 return -EIO;
3597         data = kmalloc(sizeof(*data), GFP_NOFS);
3598         if (data == NULL)
3599                 return -ENOMEM;
3600         data->client = clp;
3601         data->timestamp = jiffies;
3602         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3603                         &nfs4_renew_ops, data);
3604 }
3605
3606 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3607 {
3608         struct rpc_message msg = {
3609                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3610                 .rpc_argp       = clp,
3611                 .rpc_cred       = cred,
3612         };
3613         unsigned long now = jiffies;
3614         int status;
3615
3616         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3617         if (status < 0)
3618                 return status;
3619         do_renew_lease(clp, now);
3620         return 0;
3621 }
3622
3623 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3624 {
3625         return (server->caps & NFS_CAP_ACLS)
3626                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3627                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3628 }
3629
3630 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3631  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3632  * the stack.
3633  */
3634 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3635
3636 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3637                 struct page **pages, unsigned int *pgbase)
3638 {
3639         struct page *newpage, **spages;
3640         int rc = 0;
3641         size_t len;
3642         spages = pages;
3643
3644         do {
3645                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3646                 newpage = alloc_page(GFP_KERNEL);
3647
3648                 if (newpage == NULL)
3649                         goto unwind;
3650                 memcpy(page_address(newpage), buf, len);
3651                 buf += len;
3652                 buflen -= len;
3653                 *pages++ = newpage;
3654                 rc++;
3655         } while (buflen != 0);
3656
3657         return rc;
3658
3659 unwind:
3660         for(; rc > 0; rc--)
3661                 __free_page(spages[rc-1]);
3662         return -ENOMEM;
3663 }
3664
3665 struct nfs4_cached_acl {
3666         int cached;
3667         size_t len;
3668         char data[0];
3669 };
3670
3671 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3672 {
3673         struct nfs_inode *nfsi = NFS_I(inode);
3674
3675         spin_lock(&inode->i_lock);
3676         kfree(nfsi->nfs4_acl);
3677         nfsi->nfs4_acl = acl;
3678         spin_unlock(&inode->i_lock);
3679 }
3680
3681 static void nfs4_zap_acl_attr(struct inode *inode)
3682 {
3683         nfs4_set_cached_acl(inode, NULL);
3684 }
3685
3686 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3687 {
3688         struct nfs_inode *nfsi = NFS_I(inode);
3689         struct nfs4_cached_acl *acl;
3690         int ret = -ENOENT;
3691
3692         spin_lock(&inode->i_lock);
3693         acl = nfsi->nfs4_acl;
3694         if (acl == NULL)
3695                 goto out;
3696         if (buf == NULL) /* user is just asking for length */
3697                 goto out_len;
3698         if (acl->cached == 0)
3699                 goto out;
3700         ret = -ERANGE; /* see getxattr(2) man page */
3701         if (acl->len > buflen)
3702                 goto out;
3703         memcpy(buf, acl->data, acl->len);
3704 out_len:
3705         ret = acl->len;
3706 out:
3707         spin_unlock(&inode->i_lock);
3708         return ret;
3709 }
3710
3711 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3712 {
3713         struct nfs4_cached_acl *acl;
3714
3715         if (pages && acl_len <= PAGE_SIZE) {
3716                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3717                 if (acl == NULL)
3718                         goto out;
3719                 acl->cached = 1;
3720                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3721         } else {
3722                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3723                 if (acl == NULL)
3724                         goto out;
3725                 acl->cached = 0;
3726         }
3727         acl->len = acl_len;
3728 out:
3729         nfs4_set_cached_acl(inode, acl);
3730 }
3731
3732 /*
3733  * The getxattr API returns the required buffer length when called with a
3734  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3735  * the required buf.  On a NULL buf, we send a page of data to the server
3736  * guessing that the ACL request can be serviced by a page. If so, we cache
3737  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3738  * the cache. If not so, we throw away the page, and cache the required
3739  * length. The next getxattr call will then produce another round trip to
3740  * the server, this time with the input buf of the required size.
3741  */
3742 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3743 {
3744         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3745         struct nfs_getaclargs args = {
3746                 .fh = NFS_FH(inode),
3747                 .acl_pages = pages,
3748                 .acl_len = buflen,
3749         };
3750         struct nfs_getaclres res = {
3751                 .acl_len = buflen,
3752         };
3753         struct rpc_message msg = {
3754                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3755                 .rpc_argp = &args,
3756                 .rpc_resp = &res,
3757         };
3758         int ret = -ENOMEM, npages, i, acl_len = 0;
3759
3760         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3761         /* As long as we're doing a round trip to the server anyway,
3762          * let's be prepared for a page of acl data. */
3763         if (npages == 0)
3764                 npages = 1;
3765
3766         /* Add an extra page to handle the bitmap returned */
3767         npages++;
3768
3769         for (i = 0; i < npages; i++) {
3770                 pages[i] = alloc_page(GFP_KERNEL);
3771                 if (!pages[i])
3772                         goto out_free;
3773         }
3774
3775         /* for decoding across pages */
3776         res.acl_scratch = alloc_page(GFP_KERNEL);
3777         if (!res.acl_scratch)
3778                 goto out_free;
3779
3780         args.acl_len = npages * PAGE_SIZE;
3781         args.acl_pgbase = 0;
3782
3783         /* Let decode_getfacl know not to fail if the ACL data is larger than
3784          * the page we send as a guess */
3785         if (buf == NULL)
3786                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3787
3788         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3789                 __func__, buf, buflen, npages, args.acl_len);
3790         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3791                              &msg, &args.seq_args, &res.seq_res, 0);
3792         if (ret)
3793                 goto out_free;
3794
3795         acl_len = res.acl_len - res.acl_data_offset;
3796         if (acl_len > args.acl_len)
3797                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3798         else
3799                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3800                                       acl_len);
3801         if (buf) {
3802                 ret = -ERANGE;
3803                 if (acl_len > buflen)
3804                         goto out_free;
3805                 _copy_from_pages(buf, pages, res.acl_data_offset,
3806                                 acl_len);
3807         }
3808         ret = acl_len;
3809 out_free:
3810         for (i = 0; i < npages; i++)
3811                 if (pages[i])
3812                         __free_page(pages[i]);
3813         if (res.acl_scratch)
3814                 __free_page(res.acl_scratch);
3815         return ret;
3816 }
3817
3818 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3819 {
3820         struct nfs4_exception exception = { };
3821         ssize_t ret;
3822         do {
3823                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3824                 if (ret >= 0)
3825                         break;
3826                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3827         } while (exception.retry);
3828         return ret;
3829 }
3830
3831 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3832 {
3833         struct nfs_server *server = NFS_SERVER(inode);
3834         int ret;
3835
3836         if (!nfs4_server_supports_acls(server))
3837                 return -EOPNOTSUPP;
3838         ret = nfs_revalidate_inode(server, inode);
3839         if (ret < 0)
3840                 return ret;
3841         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3842                 nfs_zap_acl_cache(inode);
3843         ret = nfs4_read_cached_acl(inode, buf, buflen);
3844         if (ret != -ENOENT)
3845                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3846                  * but no cached acl data, just the acl length */
3847                 return ret;
3848         return nfs4_get_acl_uncached(inode, buf, buflen);
3849 }
3850
3851 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3852 {
3853         struct nfs_server *server = NFS_SERVER(inode);
3854         struct page *pages[NFS4ACL_MAXPAGES];
3855         struct nfs_setaclargs arg = {
3856                 .fh             = NFS_FH(inode),
3857                 .acl_pages      = pages,
3858                 .acl_len        = buflen,
3859         };
3860         struct nfs_setaclres res;
3861         struct rpc_message msg = {
3862                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3863                 .rpc_argp       = &arg,
3864                 .rpc_resp       = &res,
3865         };
3866         int ret, i;
3867
3868         if (!nfs4_server_supports_acls(server))
3869                 return -EOPNOTSUPP;
3870         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3871         if (i < 0)
3872                 return i;
3873         nfs4_inode_return_delegation(inode);
3874         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3875
3876         /*
3877          * Free each page after tx, so the only ref left is
3878          * held by the network stack
3879          */
3880         for (; i > 0; i--)
3881                 put_page(pages[i-1]);
3882
3883         /*
3884          * Acl update can result in inode attribute update.
3885          * so mark the attribute cache invalid.
3886          */
3887         spin_lock(&inode->i_lock);
3888         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3889         spin_unlock(&inode->i_lock);
3890         nfs_access_zap_cache(inode);
3891         nfs_zap_acl_cache(inode);
3892         return ret;
3893 }
3894
3895 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3896 {
3897         struct nfs4_exception exception = { };
3898         int err;
3899         do {
3900                 err = nfs4_handle_exception(NFS_SERVER(inode),
3901                                 __nfs4_proc_set_acl(inode, buf, buflen),
3902                                 &exception);
3903         } while (exception.retry);
3904         return err;
3905 }
3906
3907 static int
3908 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3909 {
3910         struct nfs_client *clp = server->nfs_client;
3911
3912         if (task->tk_status >= 0)
3913                 return 0;
3914         switch(task->tk_status) {
3915                 case -NFS4ERR_DELEG_REVOKED:
3916                 case -NFS4ERR_ADMIN_REVOKED:
3917                 case -NFS4ERR_BAD_STATEID:
3918                         if (state == NULL)
3919                                 break;
3920                         nfs_remove_bad_delegation(state->inode);
3921                 case -NFS4ERR_OPENMODE:
3922                         if (state == NULL)
3923                                 break;
3924                         nfs4_schedule_stateid_recovery(server, state);
3925                         goto wait_on_recovery;
3926                 case -NFS4ERR_EXPIRED:
3927                         if (state != NULL)
3928                                 nfs4_schedule_stateid_recovery(server, state);
3929                 case -NFS4ERR_STALE_STATEID:
3930                 case -NFS4ERR_STALE_CLIENTID:
3931                         nfs4_schedule_lease_recovery(clp);
3932                         goto wait_on_recovery;
3933 #if defined(CONFIG_NFS_V4_1)
3934                 case -NFS4ERR_BADSESSION:
3935                 case -NFS4ERR_BADSLOT:
3936                 case -NFS4ERR_BAD_HIGH_SLOT:
3937                 case -NFS4ERR_DEADSESSION:
3938                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3939                 case -NFS4ERR_SEQ_FALSE_RETRY:
3940                 case -NFS4ERR_SEQ_MISORDERED:
3941                         dprintk("%s ERROR %d, Reset session\n", __func__,
3942                                 task->tk_status);
3943                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3944                         task->tk_status = 0;
3945                         return -EAGAIN;
3946 #endif /* CONFIG_NFS_V4_1 */
3947                 case -NFS4ERR_DELAY:
3948                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3949                 case -NFS4ERR_GRACE:
3950                 case -EKEYEXPIRED:
3951                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3952                         task->tk_status = 0;
3953                         return -EAGAIN;
3954                 case -NFS4ERR_RETRY_UNCACHED_REP:
3955                 case -NFS4ERR_OLD_STATEID:
3956                         task->tk_status = 0;
3957                         return -EAGAIN;
3958         }
3959         task->tk_status = nfs4_map_errors(task->tk_status);
3960         return 0;
3961 wait_on_recovery:
3962         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3963         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3964                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3965         task->tk_status = 0;
3966         return -EAGAIN;
3967 }
3968
3969 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3970                                     nfs4_verifier *bootverf)
3971 {
3972         __be32 verf[2];
3973
3974         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3975                 /* An impossible timestamp guarantees this value
3976                  * will never match a generated boot time. */
3977                 verf[0] = 0;
3978                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3979         } else {
3980                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3981                 verf[0] = (__be32)nn->boot_time.tv_sec;
3982                 verf[1] = (__be32)nn->boot_time.tv_nsec;
3983         }
3984         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3985 }
3986
3987 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3988                 unsigned short port, struct rpc_cred *cred,
3989                 struct nfs4_setclientid_res *res)
3990 {
3991         nfs4_verifier sc_verifier;
3992         struct nfs4_setclientid setclientid = {
3993                 .sc_verifier = &sc_verifier,
3994                 .sc_prog = program,
3995                 .sc_cb_ident = clp->cl_cb_ident,
3996         };
3997         struct rpc_message msg = {
3998                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3999                 .rpc_argp = &setclientid,
4000                 .rpc_resp = res,
4001                 .rpc_cred = cred,
4002         };
4003         int loop = 0;
4004         int status;
4005
4006         nfs4_init_boot_verifier(clp, &sc_verifier);
4007
4008         for(;;) {
4009                 rcu_read_lock();
4010                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
4011                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
4012                                 clp->cl_ipaddr,
4013                                 rpc_peeraddr2str(clp->cl_rpcclient,
4014                                                         RPC_DISPLAY_ADDR),
4015                                 rpc_peeraddr2str(clp->cl_rpcclient,
4016                                                         RPC_DISPLAY_PROTO),
4017                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4018                                 clp->cl_id_uniquifier);
4019                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4020                                 sizeof(setclientid.sc_netid),
4021                                 rpc_peeraddr2str(clp->cl_rpcclient,
4022                                                         RPC_DISPLAY_NETID));
4023                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4024                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4025                                 clp->cl_ipaddr, port >> 8, port & 255);
4026                 rcu_read_unlock();
4027
4028                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4029                 if (status != -NFS4ERR_CLID_INUSE)
4030                         break;
4031                 if (loop != 0) {
4032                         ++clp->cl_id_uniquifier;
4033                         break;
4034                 }
4035                 ++loop;
4036                 ssleep(clp->cl_lease_time / HZ + 1);
4037         }
4038         return status;
4039 }
4040
4041 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4042                 struct nfs4_setclientid_res *arg,
4043                 struct rpc_cred *cred)
4044 {
4045         struct nfs_fsinfo fsinfo;
4046         struct rpc_message msg = {
4047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4048                 .rpc_argp = arg,
4049                 .rpc_resp = &fsinfo,
4050                 .rpc_cred = cred,
4051         };
4052         unsigned long now;
4053         int status;
4054
4055         now = jiffies;
4056         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4057         if (status == 0) {
4058                 spin_lock(&clp->cl_lock);
4059                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4060                 clp->cl_last_renewal = now;
4061                 spin_unlock(&clp->cl_lock);
4062         }
4063         return status;
4064 }
4065
4066 struct nfs4_delegreturndata {
4067         struct nfs4_delegreturnargs args;
4068         struct nfs4_delegreturnres res;
4069         struct nfs_fh fh;
4070         nfs4_stateid stateid;
4071         unsigned long timestamp;
4072         struct nfs_fattr fattr;
4073         int rpc_status;
4074 };
4075
4076 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4077 {
4078         struct nfs4_delegreturndata *data = calldata;
4079
4080         if (!nfs4_sequence_done(task, &data->res.seq_res))
4081                 return;
4082
4083         switch (task->tk_status) {
4084         case -NFS4ERR_STALE_STATEID:
4085         case -NFS4ERR_EXPIRED:
4086         case 0:
4087                 renew_lease(data->res.server, data->timestamp);
4088                 break;
4089         default:
4090                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4091                                 -EAGAIN) {
4092                         rpc_restart_call_prepare(task);
4093                         return;
4094                 }
4095         }
4096         data->rpc_status = task->tk_status;
4097 }
4098
4099 static void nfs4_delegreturn_release(void *calldata)
4100 {
4101         kfree(calldata);
4102 }
4103
4104 #if defined(CONFIG_NFS_V4_1)
4105 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4106 {
4107         struct nfs4_delegreturndata *d_data;
4108
4109         d_data = (struct nfs4_delegreturndata *)data;
4110
4111         if (nfs4_setup_sequence(d_data->res.server,
4112                                 &d_data->args.seq_args,
4113                                 &d_data->res.seq_res, task))
4114                 return;
4115         rpc_call_start(task);
4116 }
4117 #endif /* CONFIG_NFS_V4_1 */
4118
4119 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4120 #if defined(CONFIG_NFS_V4_1)
4121         .rpc_call_prepare = nfs4_delegreturn_prepare,
4122 #endif /* CONFIG_NFS_V4_1 */
4123         .rpc_call_done = nfs4_delegreturn_done,
4124         .rpc_release = nfs4_delegreturn_release,
4125 };
4126
4127 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4128 {
4129         struct nfs4_delegreturndata *data;
4130         struct nfs_server *server = NFS_SERVER(inode);
4131         struct rpc_task *task;
4132         struct rpc_message msg = {
4133                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4134                 .rpc_cred = cred,
4135         };
4136         struct rpc_task_setup task_setup_data = {
4137                 .rpc_client = server->client,
4138                 .rpc_message = &msg,
4139                 .callback_ops = &nfs4_delegreturn_ops,
4140                 .flags = RPC_TASK_ASYNC,
4141         };
4142         int status = 0;
4143
4144         data = kzalloc(sizeof(*data), GFP_NOFS);
4145         if (data == NULL)
4146                 return -ENOMEM;
4147         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4148         data->args.fhandle = &data->fh;
4149         data->args.stateid = &data->stateid;
4150         data->args.bitmask = server->cache_consistency_bitmask;
4151         nfs_copy_fh(&data->fh, NFS_FH(inode));
4152         nfs4_stateid_copy(&data->stateid, stateid);
4153         data->res.fattr = &data->fattr;
4154         data->res.server = server;
4155         nfs_fattr_init(data->res.fattr);
4156         data->timestamp = jiffies;
4157         data->rpc_status = 0;
4158
4159         task_setup_data.callback_data = data;
4160         msg.rpc_argp = &data->args;
4161         msg.rpc_resp = &data->res;
4162         task = rpc_run_task(&task_setup_data);
4163         if (IS_ERR(task))
4164                 return PTR_ERR(task);
4165         if (!issync)
4166                 goto out;
4167         status = nfs4_wait_for_completion_rpc_task(task);
4168         if (status != 0)
4169                 goto out;
4170         status = data->rpc_status;
4171         if (status == 0)
4172                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4173         else
4174                 nfs_refresh_inode(inode, &data->fattr);
4175 out:
4176         rpc_put_task(task);
4177         return status;
4178 }
4179
4180 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4181 {
4182         struct nfs_server *server = NFS_SERVER(inode);
4183         struct nfs4_exception exception = { };
4184         int err;
4185         do {
4186                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4187                 switch (err) {
4188                         case -NFS4ERR_STALE_STATEID:
4189                         case -NFS4ERR_EXPIRED:
4190                         case 0:
4191                                 return 0;
4192                 }
4193                 err = nfs4_handle_exception(server, err, &exception);
4194         } while (exception.retry);
4195         return err;
4196 }
4197
4198 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4199 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4200
4201 /*
4202  * sleep, with exponential backoff, and retry the LOCK operation.
4203  */
4204 static unsigned long
4205 nfs4_set_lock_task_retry(unsigned long timeout)
4206 {
4207         freezable_schedule_timeout_killable(timeout);
4208         timeout <<= 1;
4209         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4210                 return NFS4_LOCK_MAXTIMEOUT;
4211         return timeout;
4212 }
4213
4214 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4215 {
4216         struct inode *inode = state->inode;
4217         struct nfs_server *server = NFS_SERVER(inode);
4218         struct nfs_client *clp = server->nfs_client;
4219         struct nfs_lockt_args arg = {
4220                 .fh = NFS_FH(inode),
4221                 .fl = request,
4222         };
4223         struct nfs_lockt_res res = {
4224                 .denied = request,
4225         };
4226         struct rpc_message msg = {
4227                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4228                 .rpc_argp       = &arg,
4229                 .rpc_resp       = &res,
4230                 .rpc_cred       = state->owner->so_cred,
4231         };
4232         struct nfs4_lock_state *lsp;
4233         int status;
4234
4235         arg.lock_owner.clientid = clp->cl_clientid;
4236         status = nfs4_set_lock_state(state, request);
4237         if (status != 0)
4238                 goto out;
4239         lsp = request->fl_u.nfs4_fl.owner;
4240         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4241         arg.lock_owner.s_dev = server->s_dev;
4242         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4243         switch (status) {
4244                 case 0:
4245                         request->fl_type = F_UNLCK;
4246                         break;
4247                 case -NFS4ERR_DENIED:
4248                         status = 0;
4249         }
4250         request->fl_ops->fl_release_private(request);
4251 out:
4252         return status;
4253 }
4254
4255 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4256 {
4257         struct nfs4_exception exception = { };
4258         int err;
4259
4260         do {
4261                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4262                                 _nfs4_proc_getlk(state, cmd, request),
4263                                 &exception);
4264         } while (exception.retry);
4265         return err;
4266 }
4267
4268 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4269 {
4270         int res = 0;
4271         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4272                 case FL_POSIX:
4273                         res = posix_lock_file_wait(file, fl);
4274                         break;
4275                 case FL_FLOCK:
4276                         res = flock_lock_file_wait(file, fl);
4277                         break;
4278                 default:
4279                         BUG();
4280         }
4281         return res;
4282 }
4283
4284 struct nfs4_unlockdata {
4285         struct nfs_locku_args arg;
4286         struct nfs_locku_res res;
4287         struct nfs4_lock_state *lsp;
4288         struct nfs_open_context *ctx;
4289         struct file_lock fl;
4290         const struct nfs_server *server;
4291         unsigned long timestamp;
4292 };
4293
4294 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4295                 struct nfs_open_context *ctx,
4296                 struct nfs4_lock_state *lsp,
4297                 struct nfs_seqid *seqid)
4298 {
4299         struct nfs4_unlockdata *p;
4300         struct inode *inode = lsp->ls_state->inode;
4301
4302         p = kzalloc(sizeof(*p), GFP_NOFS);
4303         if (p == NULL)
4304                 return NULL;
4305         p->arg.fh = NFS_FH(inode);
4306         p->arg.fl = &p->fl;
4307         p->arg.seqid = seqid;
4308         p->res.seqid = seqid;
4309         p->arg.stateid = &lsp->ls_stateid;
4310         p->lsp = lsp;
4311         atomic_inc(&lsp->ls_count);
4312         /* Ensure we don't close file until we're done freeing locks! */
4313         p->ctx = get_nfs_open_context(ctx);
4314         memcpy(&p->fl, fl, sizeof(p->fl));
4315         p->server = NFS_SERVER(inode);
4316         return p;
4317 }
4318
4319 static void nfs4_locku_release_calldata(void *data)
4320 {
4321         struct nfs4_unlockdata *calldata = data;
4322         nfs_free_seqid(calldata->arg.seqid);
4323         nfs4_put_lock_state(calldata->lsp);
4324         put_nfs_open_context(calldata->ctx);
4325         kfree(calldata);
4326 }
4327
4328 static void nfs4_locku_done(struct rpc_task *task, void *data)
4329 {
4330         struct nfs4_unlockdata *calldata = data;
4331
4332         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4333                 return;
4334         switch (task->tk_status) {
4335                 case 0:
4336                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4337                                         &calldata->res.stateid);
4338                         renew_lease(calldata->server, calldata->timestamp);
4339                         break;
4340                 case -NFS4ERR_BAD_STATEID:
4341                 case -NFS4ERR_OLD_STATEID:
4342                 case -NFS4ERR_STALE_STATEID:
4343                 case -NFS4ERR_EXPIRED:
4344                         break;
4345                 default:
4346                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4347                                 rpc_restart_call_prepare(task);
4348         }
4349 }
4350
4351 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4352 {
4353         struct nfs4_unlockdata *calldata = data;
4354
4355         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4356                 return;
4357         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4358                 /* Note: exit _without_ running nfs4_locku_done */
4359                 task->tk_action = NULL;
4360                 return;
4361         }
4362         calldata->timestamp = jiffies;
4363         if (nfs4_setup_sequence(calldata->server,
4364                                 &calldata->arg.seq_args,
4365                                 &calldata->res.seq_res, task))
4366                 return;
4367         rpc_call_start(task);
4368 }
4369
4370 static const struct rpc_call_ops nfs4_locku_ops = {
4371         .rpc_call_prepare = nfs4_locku_prepare,
4372         .rpc_call_done = nfs4_locku_done,
4373         .rpc_release = nfs4_locku_release_calldata,
4374 };
4375
4376 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4377                 struct nfs_open_context *ctx,
4378                 struct nfs4_lock_state *lsp,
4379                 struct nfs_seqid *seqid)
4380 {
4381         struct nfs4_unlockdata *data;
4382         struct rpc_message msg = {
4383                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4384                 .rpc_cred = ctx->cred,
4385         };
4386         struct rpc_task_setup task_setup_data = {
4387                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4388                 .rpc_message = &msg,
4389                 .callback_ops = &nfs4_locku_ops,
4390                 .workqueue = nfsiod_workqueue,
4391                 .flags = RPC_TASK_ASYNC,
4392         };
4393
4394         /* Ensure this is an unlock - when canceling a lock, the
4395          * canceled lock is passed in, and it won't be an unlock.
4396          */
4397         fl->fl_type = F_UNLCK;
4398
4399         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4400         if (data == NULL) {
4401                 nfs_free_seqid(seqid);
4402                 return ERR_PTR(-ENOMEM);
4403         }
4404
4405         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4406         msg.rpc_argp = &data->arg;
4407         msg.rpc_resp = &data->res;
4408         task_setup_data.callback_data = data;
4409         return rpc_run_task(&task_setup_data);
4410 }
4411
4412 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4413 {
4414         struct nfs_inode *nfsi = NFS_I(state->inode);
4415         struct nfs_seqid *seqid;
4416         struct nfs4_lock_state *lsp;
4417         struct rpc_task *task;
4418         int status = 0;
4419         unsigned char fl_flags = request->fl_flags;
4420
4421         status = nfs4_set_lock_state(state, request);
4422         /* Unlock _before_ we do the RPC call */
4423         request->fl_flags |= FL_EXISTS;
4424         down_read(&nfsi->rwsem);
4425         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4426                 up_read(&nfsi->rwsem);
4427                 goto out;
4428         }
4429         up_read(&nfsi->rwsem);
4430         if (status != 0)
4431                 goto out;
4432         /* Is this a delegated lock? */
4433         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4434                 goto out;
4435         lsp = request->fl_u.nfs4_fl.owner;
4436         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4437         status = -ENOMEM;
4438         if (seqid == NULL)
4439                 goto out;
4440         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4441         status = PTR_ERR(task);
4442         if (IS_ERR(task))
4443                 goto out;
4444         status = nfs4_wait_for_completion_rpc_task(task);
4445         rpc_put_task(task);
4446 out:
4447         request->fl_flags = fl_flags;
4448         return status;
4449 }
4450
4451 struct nfs4_lockdata {
4452         struct nfs_lock_args arg;
4453         struct nfs_lock_res res;
4454         struct nfs4_lock_state *lsp;
4455         struct nfs_open_context *ctx;
4456         struct file_lock fl;
4457         unsigned long timestamp;
4458         int rpc_status;
4459         int cancelled;
4460         struct nfs_server *server;
4461 };
4462
4463 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4464                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4465                 gfp_t gfp_mask)
4466 {
4467         struct nfs4_lockdata *p;
4468         struct inode *inode = lsp->ls_state->inode;
4469         struct nfs_server *server = NFS_SERVER(inode);
4470
4471         p = kzalloc(sizeof(*p), gfp_mask);
4472         if (p == NULL)
4473                 return NULL;
4474
4475         p->arg.fh = NFS_FH(inode);
4476         p->arg.fl = &p->fl;
4477         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4478         if (p->arg.open_seqid == NULL)
4479                 goto out_free;
4480         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4481         if (p->arg.lock_seqid == NULL)
4482                 goto out_free_seqid;
4483         p->arg.lock_stateid = &lsp->ls_stateid;
4484         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4485         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4486         p->arg.lock_owner.s_dev = server->s_dev;
4487         p->res.lock_seqid = p->arg.lock_seqid;
4488         p->lsp = lsp;
4489         p->server = server;
4490         atomic_inc(&lsp->ls_count);
4491         p->ctx = get_nfs_open_context(ctx);
4492         memcpy(&p->fl, fl, sizeof(p->fl));
4493         return p;
4494 out_free_seqid:
4495         nfs_free_seqid(p->arg.open_seqid);
4496 out_free:
4497         kfree(p);
4498         return NULL;
4499 }
4500
4501 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4502 {
4503         struct nfs4_lockdata *data = calldata;
4504         struct nfs4_state *state = data->lsp->ls_state;
4505
4506         dprintk("%s: begin!\n", __func__);
4507         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4508                 return;
4509         /* Do we need to do an open_to_lock_owner? */
4510         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4511                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4512                         return;
4513                 data->arg.open_stateid = &state->stateid;
4514                 data->arg.new_lock_owner = 1;
4515                 data->res.open_seqid = data->arg.open_seqid;
4516         } else
4517                 data->arg.new_lock_owner = 0;
4518         data->timestamp = jiffies;
4519         if (nfs4_setup_sequence(data->server,
4520                                 &data->arg.seq_args,
4521                                 &data->res.seq_res, task))
4522                 return;
4523         rpc_call_start(task);
4524         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4525 }
4526
4527 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4528 {
4529         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4530         nfs4_lock_prepare(task, calldata);
4531 }
4532
4533 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4534 {
4535         struct nfs4_lockdata *data = calldata;
4536
4537         dprintk("%s: begin!\n", __func__);
4538
4539         if (!nfs4_sequence_done(task, &data->res.seq_res))
4540                 return;
4541
4542         data->rpc_status = task->tk_status;
4543         if (data->arg.new_lock_owner != 0) {
4544                 if (data->rpc_status == 0)
4545                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4546                 else
4547                         goto out;
4548         }
4549         if (data->rpc_status == 0) {
4550                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4551                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4552                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4553         }
4554 out:
4555         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4556 }
4557
4558 static void nfs4_lock_release(void *calldata)
4559 {
4560         struct nfs4_lockdata *data = calldata;
4561
4562         dprintk("%s: begin!\n", __func__);
4563         nfs_free_seqid(data->arg.open_seqid);
4564         if (data->cancelled != 0) {
4565                 struct rpc_task *task;
4566                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4567                                 data->arg.lock_seqid);
4568                 if (!IS_ERR(task))
4569                         rpc_put_task_async(task);
4570                 dprintk("%s: cancelling lock!\n", __func__);
4571         } else
4572                 nfs_free_seqid(data->arg.lock_seqid);
4573         nfs4_put_lock_state(data->lsp);
4574         put_nfs_open_context(data->ctx);
4575         kfree(data);
4576         dprintk("%s: done!\n", __func__);
4577 }
4578
4579 static const struct rpc_call_ops nfs4_lock_ops = {
4580         .rpc_call_prepare = nfs4_lock_prepare,
4581         .rpc_call_done = nfs4_lock_done,
4582         .rpc_release = nfs4_lock_release,
4583 };
4584
4585 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4586         .rpc_call_prepare = nfs4_recover_lock_prepare,
4587         .rpc_call_done = nfs4_lock_done,
4588         .rpc_release = nfs4_lock_release,
4589 };
4590
4591 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4592 {
4593         switch (error) {
4594         case -NFS4ERR_ADMIN_REVOKED:
4595         case -NFS4ERR_BAD_STATEID:
4596                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4597                 if (new_lock_owner != 0 ||
4598                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4599                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4600                 break;
4601         case -NFS4ERR_STALE_STATEID:
4602                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4603         case -NFS4ERR_EXPIRED:
4604                 nfs4_schedule_lease_recovery(server->nfs_client);
4605         };
4606 }
4607
4608 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4609 {
4610         struct nfs4_lockdata *data;
4611         struct rpc_task *task;
4612         struct rpc_message msg = {
4613                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4614                 .rpc_cred = state->owner->so_cred,
4615         };
4616         struct rpc_task_setup task_setup_data = {
4617                 .rpc_client = NFS_CLIENT(state->inode),
4618                 .rpc_message = &msg,
4619                 .callback_ops = &nfs4_lock_ops,
4620                 .workqueue = nfsiod_workqueue,
4621                 .flags = RPC_TASK_ASYNC,
4622         };
4623         int ret;
4624
4625         dprintk("%s: begin!\n", __func__);
4626         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4627                         fl->fl_u.nfs4_fl.owner,
4628                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4629         if (data == NULL)
4630                 return -ENOMEM;
4631         if (IS_SETLKW(cmd))
4632                 data->arg.block = 1;
4633         if (recovery_type > NFS_LOCK_NEW) {
4634                 if (recovery_type == NFS_LOCK_RECLAIM)
4635                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4636                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4637         }
4638         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4639         msg.rpc_argp = &data->arg;
4640         msg.rpc_resp = &data->res;
4641         task_setup_data.callback_data = data;
4642         task = rpc_run_task(&task_setup_data);
4643         if (IS_ERR(task))
4644                 return PTR_ERR(task);
4645         ret = nfs4_wait_for_completion_rpc_task(task);
4646         if (ret == 0) {
4647                 ret = data->rpc_status;
4648                 if (ret)
4649                         nfs4_handle_setlk_error(data->server, data->lsp,
4650                                         data->arg.new_lock_owner, ret);
4651         } else
4652                 data->cancelled = 1;
4653         rpc_put_task(task);
4654         dprintk("%s: done, ret = %d!\n", __func__, ret);
4655         return ret;
4656 }
4657
4658 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4659 {
4660         struct nfs_server *server = NFS_SERVER(state->inode);
4661         struct nfs4_exception exception = {
4662                 .inode = state->inode,
4663         };
4664         int err;
4665
4666         do {
4667                 /* Cache the lock if possible... */
4668                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4669                         return 0;
4670                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4671                 if (err != -NFS4ERR_DELAY)
4672                         break;
4673                 nfs4_handle_exception(server, err, &exception);
4674         } while (exception.retry);
4675         return err;
4676 }
4677
4678 static int nfs4_lock_expired(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         err = nfs4_set_lock_state(state, request);
4687         if (err != 0)
4688                 return err;
4689         do {
4690                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4691                         return 0;
4692                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4693                 switch (err) {
4694                 default:
4695                         goto out;
4696                 case -NFS4ERR_GRACE:
4697                 case -NFS4ERR_DELAY:
4698                         nfs4_handle_exception(server, err, &exception);
4699                         err = 0;
4700                 }
4701         } while (exception.retry);
4702 out:
4703         return err;
4704 }
4705
4706 #if defined(CONFIG_NFS_V4_1)
4707 static int nfs41_check_expired_locks(struct nfs4_state *state)
4708 {
4709         int status, ret = NFS_OK;
4710         struct nfs4_lock_state *lsp;
4711         struct nfs_server *server = NFS_SERVER(state->inode);
4712
4713         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4714                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4715                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4716                         if (status != NFS_OK) {
4717                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4718                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4719                                 ret = status;
4720                         }
4721                 }
4722         };
4723
4724         return ret;
4725 }
4726
4727 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4728 {
4729         int status = NFS_OK;
4730
4731         if (test_bit(LK_STATE_IN_USE, &state->flags))
4732                 status = nfs41_check_expired_locks(state);
4733         if (status == NFS_OK)
4734                 return status;
4735         return nfs4_lock_expired(state, request);
4736 }
4737 #endif
4738
4739 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4740 {
4741         struct nfs_inode *nfsi = NFS_I(state->inode);
4742         unsigned char fl_flags = request->fl_flags;
4743         int status = -ENOLCK;
4744
4745         if ((fl_flags & FL_POSIX) &&
4746                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4747                 goto out;
4748         /* Is this a delegated open? */
4749         status = nfs4_set_lock_state(state, request);
4750         if (status != 0)
4751                 goto out;
4752         request->fl_flags |= FL_ACCESS;
4753         status = do_vfs_lock(request->fl_file, request);
4754         if (status < 0)
4755                 goto out;
4756         down_read(&nfsi->rwsem);
4757         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4758                 /* Yes: cache locks! */
4759                 /* ...but avoid races with delegation recall... */
4760                 request->fl_flags = fl_flags & ~FL_SLEEP;
4761                 status = do_vfs_lock(request->fl_file, request);
4762                 goto out_unlock;
4763         }
4764         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4765         if (status != 0)
4766                 goto out_unlock;
4767         /* Note: we always want to sleep here! */
4768         request->fl_flags = fl_flags | FL_SLEEP;
4769         if (do_vfs_lock(request->fl_file, request) < 0)
4770                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4771                         "manager!\n", __func__);
4772 out_unlock:
4773         up_read(&nfsi->rwsem);
4774 out:
4775         request->fl_flags = fl_flags;
4776         return status;
4777 }
4778
4779 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4780 {
4781         struct nfs4_exception exception = {
4782                 .state = state,
4783                 .inode = state->inode,
4784         };
4785         int err;
4786
4787         do {
4788                 err = _nfs4_proc_setlk(state, cmd, request);
4789                 if (err == -NFS4ERR_DENIED)
4790                         err = -EAGAIN;
4791                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4792                                 err, &exception);
4793         } while (exception.retry);
4794         return err;
4795 }
4796
4797 static int
4798 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4799 {
4800         struct nfs_open_context *ctx;
4801         struct nfs4_state *state;
4802         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4803         int status;
4804
4805         /* verify open state */
4806         ctx = nfs_file_open_context(filp);
4807         state = ctx->state;
4808
4809         if (request->fl_start < 0 || request->fl_end < 0)
4810                 return -EINVAL;
4811
4812         if (IS_GETLK(cmd)) {
4813                 if (state != NULL)
4814                         return nfs4_proc_getlk(state, F_GETLK, request);
4815                 return 0;
4816         }
4817
4818         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4819                 return -EINVAL;
4820
4821         if (request->fl_type == F_UNLCK) {
4822                 if (state != NULL)
4823                         return nfs4_proc_unlck(state, cmd, request);
4824                 return 0;
4825         }
4826
4827         if (state == NULL)
4828                 return -ENOLCK;
4829         /*
4830          * Don't rely on the VFS having checked the file open mode,
4831          * since it won't do this for flock() locks.
4832          */
4833         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4834         case F_RDLCK:
4835                 if (!(filp->f_mode & FMODE_READ))
4836                         return -EBADF;
4837                 break;
4838         case F_WRLCK:
4839                 if (!(filp->f_mode & FMODE_WRITE))
4840                         return -EBADF;
4841         }
4842
4843         do {
4844                 status = nfs4_proc_setlk(state, cmd, request);
4845                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4846                         break;
4847                 timeout = nfs4_set_lock_task_retry(timeout);
4848                 status = -ERESTARTSYS;
4849                 if (signalled())
4850                         break;
4851         } while(status < 0);
4852         return status;
4853 }
4854
4855 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4856 {
4857         struct nfs_server *server = NFS_SERVER(state->inode);
4858         struct nfs4_exception exception = { };
4859         int err;
4860
4861         err = nfs4_set_lock_state(state, fl);
4862         if (err != 0)
4863                 goto out;
4864         do {
4865                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4866                 switch (err) {
4867                         default:
4868                                 printk(KERN_ERR "NFS: %s: unhandled error "
4869                                         "%d.\n", __func__, err);
4870                         case 0:
4871                         case -ESTALE:
4872                                 goto out;
4873                         case -NFS4ERR_EXPIRED:
4874                                 nfs4_schedule_stateid_recovery(server, state);
4875                         case -NFS4ERR_STALE_CLIENTID:
4876                         case -NFS4ERR_STALE_STATEID:
4877                                 nfs4_schedule_lease_recovery(server->nfs_client);
4878                                 goto out;
4879                         case -NFS4ERR_BADSESSION:
4880                         case -NFS4ERR_BADSLOT:
4881                         case -NFS4ERR_BAD_HIGH_SLOT:
4882                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4883                         case -NFS4ERR_DEADSESSION:
4884                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4885                                 goto out;
4886                         case -ERESTARTSYS:
4887                                 /*
4888                                  * The show must go on: exit, but mark the
4889                                  * stateid as needing recovery.
4890                                  */
4891                         case -NFS4ERR_DELEG_REVOKED:
4892                         case -NFS4ERR_ADMIN_REVOKED:
4893                         case -NFS4ERR_BAD_STATEID:
4894                         case -NFS4ERR_OPENMODE:
4895                                 nfs4_schedule_stateid_recovery(server, state);
4896                                 err = 0;
4897                                 goto out;
4898                         case -EKEYEXPIRED:
4899                                 /*
4900                                  * User RPCSEC_GSS context has expired.
4901                                  * We cannot recover this stateid now, so
4902                                  * skip it and allow recovery thread to
4903                                  * proceed.
4904                                  */
4905                                 err = 0;
4906                                 goto out;
4907                         case -ENOMEM:
4908                         case -NFS4ERR_DENIED:
4909                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4910                                 err = 0;
4911                                 goto out;
4912                         case -NFS4ERR_DELAY:
4913                                 break;
4914                 }
4915                 err = nfs4_handle_exception(server, err, &exception);
4916         } while (exception.retry);
4917 out:
4918         return err;
4919 }
4920
4921 struct nfs_release_lockowner_data {
4922         struct nfs4_lock_state *lsp;
4923         struct nfs_server *server;
4924         struct nfs_release_lockowner_args args;
4925 };
4926
4927 static void nfs4_release_lockowner_release(void *calldata)
4928 {
4929         struct nfs_release_lockowner_data *data = calldata;
4930         nfs4_free_lock_state(data->server, data->lsp);
4931         kfree(calldata);
4932 }
4933
4934 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4935         .rpc_release = nfs4_release_lockowner_release,
4936 };
4937
4938 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4939 {
4940         struct nfs_server *server = lsp->ls_state->owner->so_server;
4941         struct nfs_release_lockowner_data *data;
4942         struct rpc_message msg = {
4943                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4944         };
4945
4946         if (server->nfs_client->cl_mvops->minor_version != 0)
4947                 return -EINVAL;
4948         data = kmalloc(sizeof(*data), GFP_NOFS);
4949         if (!data)
4950                 return -ENOMEM;
4951         data->lsp = lsp;
4952         data->server = server;
4953         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4954         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4955         data->args.lock_owner.s_dev = server->s_dev;
4956         msg.rpc_argp = &data->args;
4957         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4958         return 0;
4959 }
4960
4961 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4962
4963 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4964                                    const void *buf, size_t buflen,
4965                                    int flags, int type)
4966 {
4967         if (strcmp(key, "") != 0)
4968                 return -EINVAL;
4969
4970         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4971 }
4972
4973 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4974                                    void *buf, size_t buflen, int type)
4975 {
4976         if (strcmp(key, "") != 0)
4977                 return -EINVAL;
4978
4979         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4980 }
4981
4982 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4983                                        size_t list_len, const char *name,
4984                                        size_t name_len, int type)
4985 {
4986         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4987
4988         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4989                 return 0;
4990
4991         if (list && len <= list_len)
4992                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4993         return len;
4994 }
4995
4996 /*
4997  * nfs_fhget will use either the mounted_on_fileid or the fileid
4998  */
4999 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5000 {
5001         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5002                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5003               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5004               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5005                 return;
5006
5007         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5008                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5009         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5010         fattr->nlink = 2;
5011 }
5012
5013 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5014                                    const struct qstr *name,
5015                                    struct nfs4_fs_locations *fs_locations,
5016                                    struct page *page)
5017 {
5018         struct nfs_server *server = NFS_SERVER(dir);
5019         u32 bitmask[2] = {
5020                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5021         };
5022         struct nfs4_fs_locations_arg args = {
5023                 .dir_fh = NFS_FH(dir),
5024                 .name = name,
5025                 .page = page,
5026                 .bitmask = bitmask,
5027         };
5028         struct nfs4_fs_locations_res res = {
5029                 .fs_locations = fs_locations,
5030         };
5031         struct rpc_message msg = {
5032                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5033                 .rpc_argp = &args,
5034                 .rpc_resp = &res,
5035         };
5036         int status;
5037
5038         dprintk("%s: start\n", __func__);
5039
5040         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5041          * is not supported */
5042         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5043                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5044         else
5045                 bitmask[0] |= FATTR4_WORD0_FILEID;
5046
5047         nfs_fattr_init(&fs_locations->fattr);
5048         fs_locations->server = server;
5049         fs_locations->nlocations = 0;
5050         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5051         dprintk("%s: returned status = %d\n", __func__, status);
5052         return status;
5053 }
5054
5055 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5056                            const struct qstr *name,
5057                            struct nfs4_fs_locations *fs_locations,
5058                            struct page *page)
5059 {
5060         struct nfs4_exception exception = { };
5061         int err;
5062         do {
5063                 err = nfs4_handle_exception(NFS_SERVER(dir),
5064                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5065                                 &exception);
5066         } while (exception.retry);
5067         return err;
5068 }
5069
5070 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5071 {
5072         int status;
5073         struct nfs4_secinfo_arg args = {
5074                 .dir_fh = NFS_FH(dir),
5075                 .name   = name,
5076         };
5077         struct nfs4_secinfo_res res = {
5078                 .flavors     = flavors,
5079         };
5080         struct rpc_message msg = {
5081                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5082                 .rpc_argp = &args,
5083                 .rpc_resp = &res,
5084         };
5085
5086         dprintk("NFS call  secinfo %s\n", name->name);
5087         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5088         dprintk("NFS reply  secinfo: %d\n", status);
5089         return status;
5090 }
5091
5092 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5093                       struct nfs4_secinfo_flavors *flavors)
5094 {
5095         struct nfs4_exception exception = { };
5096         int err;
5097         do {
5098                 err = nfs4_handle_exception(NFS_SERVER(dir),
5099                                 _nfs4_proc_secinfo(dir, name, flavors),
5100                                 &exception);
5101         } while (exception.retry);
5102         return err;
5103 }
5104
5105 #ifdef CONFIG_NFS_V4_1
5106 /*
5107  * Check the exchange flags returned by the server for invalid flags, having
5108  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5109  * DS flags set.
5110  */
5111 static int nfs4_check_cl_exchange_flags(u32 flags)
5112 {
5113         if (flags & ~EXCHGID4_FLAG_MASK_R)
5114                 goto out_inval;
5115         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5116             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5117                 goto out_inval;
5118         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5119                 goto out_inval;
5120         return NFS_OK;
5121 out_inval:
5122         return -NFS4ERR_INVAL;
5123 }
5124
5125 static bool
5126 nfs41_same_server_scope(struct nfs41_server_scope *a,
5127                         struct nfs41_server_scope *b)
5128 {
5129         if (a->server_scope_sz == b->server_scope_sz &&
5130             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5131                 return true;
5132
5133         return false;
5134 }
5135
5136 /*
5137  * nfs4_proc_bind_conn_to_session()
5138  *
5139  * The 4.1 client currently uses the same TCP connection for the
5140  * fore and backchannel.
5141  */
5142 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5143 {
5144         int status;
5145         struct nfs41_bind_conn_to_session_res res;
5146         struct rpc_message msg = {
5147                 .rpc_proc =
5148                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5149                 .rpc_argp = clp,
5150                 .rpc_resp = &res,
5151                 .rpc_cred = cred,
5152         };
5153
5154         dprintk("--> %s\n", __func__);
5155         BUG_ON(clp == NULL);
5156
5157         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5158         if (unlikely(res.session == NULL)) {
5159                 status = -ENOMEM;
5160                 goto out;
5161         }
5162
5163         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5164         if (status == 0) {
5165                 if (memcmp(res.session->sess_id.data,
5166                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5167                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5168                         status = -EIO;
5169                         goto out_session;
5170                 }
5171                 if (res.dir != NFS4_CDFS4_BOTH) {
5172                         dprintk("NFS: %s: Unexpected direction from server\n",
5173                                 __func__);
5174                         status = -EIO;
5175                         goto out_session;
5176                 }
5177                 if (res.use_conn_in_rdma_mode) {
5178                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5179                                 __func__);
5180                         status = -EIO;
5181                         goto out_session;
5182                 }
5183         }
5184 out_session:
5185         kfree(res.session);
5186 out:
5187         dprintk("<-- %s status= %d\n", __func__, status);
5188         return status;
5189 }
5190
5191 /*
5192  * nfs4_proc_exchange_id()
5193  *
5194  * Since the clientid has expired, all compounds using sessions
5195  * associated with the stale clientid will be returning
5196  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5197  * be in some phase of session reset.
5198  */
5199 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5200 {
5201         nfs4_verifier verifier;
5202         struct nfs41_exchange_id_args args = {
5203                 .verifier = &verifier,
5204                 .client = clp,
5205                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5206         };
5207         struct nfs41_exchange_id_res res = {
5208                 0
5209         };
5210         int status;
5211         struct rpc_message msg = {
5212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5213                 .rpc_argp = &args,
5214                 .rpc_resp = &res,
5215                 .rpc_cred = cred,
5216         };
5217
5218         dprintk("--> %s\n", __func__);
5219         BUG_ON(clp == NULL);
5220
5221         nfs4_init_boot_verifier(clp, &verifier);
5222
5223         args.id_len = scnprintf(args.id, sizeof(args.id),
5224                                 "%s/%s/%u",
5225                                 clp->cl_ipaddr,
5226                                 clp->cl_rpcclient->cl_nodename,
5227                                 clp->cl_rpcclient->cl_auth->au_flavor);
5228
5229         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5230                                         GFP_NOFS);
5231         if (unlikely(res.server_owner == NULL)) {
5232                 status = -ENOMEM;
5233                 goto out;
5234         }
5235
5236         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5237                                         GFP_NOFS);
5238         if (unlikely(res.server_scope == NULL)) {
5239                 status = -ENOMEM;
5240                 goto out_server_owner;
5241         }
5242
5243         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5244         if (unlikely(res.impl_id == NULL)) {
5245                 status = -ENOMEM;
5246                 goto out_server_scope;
5247         }
5248
5249         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5250         if (status == 0)
5251                 status = nfs4_check_cl_exchange_flags(res.flags);
5252
5253         if (status == 0) {
5254                 clp->cl_clientid = res.clientid;
5255                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5256                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5257                         clp->cl_seqid = res.seqid;
5258
5259                 kfree(clp->cl_serverowner);
5260                 clp->cl_serverowner = res.server_owner;
5261                 res.server_owner = NULL;
5262
5263                 /* use the most recent implementation id */
5264                 kfree(clp->cl_implid);
5265                 clp->cl_implid = res.impl_id;
5266
5267                 if (clp->cl_serverscope != NULL &&
5268                     !nfs41_same_server_scope(clp->cl_serverscope,
5269                                              res.server_scope)) {
5270                         dprintk("%s: server_scope mismatch detected\n",
5271                                 __func__);
5272                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5273                         kfree(clp->cl_serverscope);
5274                         clp->cl_serverscope = NULL;
5275                 }
5276
5277                 if (clp->cl_serverscope == NULL) {
5278                         clp->cl_serverscope = res.server_scope;
5279                         goto out;
5280                 }
5281         } else
5282                 kfree(res.impl_id);
5283
5284 out_server_owner:
5285         kfree(res.server_owner);
5286 out_server_scope:
5287         kfree(res.server_scope);
5288 out:
5289         if (clp->cl_implid != NULL)
5290                 dprintk("%s: Server Implementation ID: "
5291                         "domain: %s, name: %s, date: %llu,%u\n",
5292                         __func__, clp->cl_implid->domain, clp->cl_implid->name,
5293                         clp->cl_implid->date.seconds,
5294                         clp->cl_implid->date.nseconds);
5295         dprintk("<-- %s status= %d\n", __func__, status);
5296         return status;
5297 }
5298
5299 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5300                 struct rpc_cred *cred)
5301 {
5302         struct rpc_message msg = {
5303                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5304                 .rpc_argp = clp,
5305                 .rpc_cred = cred,
5306         };
5307         int status;
5308
5309         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5310         if (status)
5311                 dprintk("NFS: Got error %d from the server %s on "
5312                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5313         return status;
5314 }
5315
5316 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5317                 struct rpc_cred *cred)
5318 {
5319         unsigned int loop;
5320         int ret;
5321
5322         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5323                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5324                 switch (ret) {
5325                 case -NFS4ERR_DELAY:
5326                 case -NFS4ERR_CLIENTID_BUSY:
5327                         ssleep(1);
5328                         break;
5329                 default:
5330                         return ret;
5331                 }
5332         }
5333         return 0;
5334 }
5335
5336 int nfs4_destroy_clientid(struct nfs_client *clp)
5337 {
5338         struct rpc_cred *cred;
5339         int ret = 0;
5340
5341         if (clp->cl_mvops->minor_version < 1)
5342                 goto out;
5343         if (clp->cl_exchange_flags == 0)
5344                 goto out;
5345         cred = nfs4_get_exchange_id_cred(clp);
5346         ret = nfs4_proc_destroy_clientid(clp, cred);
5347         if (cred)
5348                 put_rpccred(cred);
5349         switch (ret) {
5350         case 0:
5351         case -NFS4ERR_STALE_CLIENTID:
5352                 clp->cl_exchange_flags = 0;
5353         }
5354 out:
5355         return ret;
5356 }
5357
5358 struct nfs4_get_lease_time_data {
5359         struct nfs4_get_lease_time_args *args;
5360         struct nfs4_get_lease_time_res *res;
5361         struct nfs_client *clp;
5362 };
5363
5364 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5365                                         void *calldata)
5366 {
5367         int ret;
5368         struct nfs4_get_lease_time_data *data =
5369                         (struct nfs4_get_lease_time_data *)calldata;
5370
5371         dprintk("--> %s\n", __func__);
5372         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5373         /* just setup sequence, do not trigger session recovery
5374            since we're invoked within one */
5375         ret = nfs41_setup_sequence(data->clp->cl_session,
5376                                    &data->args->la_seq_args,
5377                                    &data->res->lr_seq_res, task);
5378
5379         BUG_ON(ret == -EAGAIN);
5380         rpc_call_start(task);
5381         dprintk("<-- %s\n", __func__);
5382 }
5383
5384 /*
5385  * Called from nfs4_state_manager thread for session setup, so don't recover
5386  * from sequence operation or clientid errors.
5387  */
5388 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5389 {
5390         struct nfs4_get_lease_time_data *data =
5391                         (struct nfs4_get_lease_time_data *)calldata;
5392
5393         dprintk("--> %s\n", __func__);
5394         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5395                 return;
5396         switch (task->tk_status) {
5397         case -NFS4ERR_DELAY:
5398         case -NFS4ERR_GRACE:
5399                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5400                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5401                 task->tk_status = 0;
5402                 /* fall through */
5403         case -NFS4ERR_RETRY_UNCACHED_REP:
5404                 rpc_restart_call_prepare(task);
5405                 return;
5406         }
5407         dprintk("<-- %s\n", __func__);
5408 }
5409
5410 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5411         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5412         .rpc_call_done = nfs4_get_lease_time_done,
5413 };
5414
5415 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5416 {
5417         struct rpc_task *task;
5418         struct nfs4_get_lease_time_args args;
5419         struct nfs4_get_lease_time_res res = {
5420                 .lr_fsinfo = fsinfo,
5421         };
5422         struct nfs4_get_lease_time_data data = {
5423                 .args = &args,
5424                 .res = &res,
5425                 .clp = clp,
5426         };
5427         struct rpc_message msg = {
5428                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5429                 .rpc_argp = &args,
5430                 .rpc_resp = &res,
5431         };
5432         struct rpc_task_setup task_setup = {
5433                 .rpc_client = clp->cl_rpcclient,
5434                 .rpc_message = &msg,
5435                 .callback_ops = &nfs4_get_lease_time_ops,
5436                 .callback_data = &data,
5437                 .flags = RPC_TASK_TIMEOUT,
5438         };
5439         int status;
5440
5441         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5442         dprintk("--> %s\n", __func__);
5443         task = rpc_run_task(&task_setup);
5444
5445         if (IS_ERR(task))
5446                 status = PTR_ERR(task);
5447         else {
5448                 status = task->tk_status;
5449                 rpc_put_task(task);
5450         }
5451         dprintk("<-- %s return %d\n", __func__, status);
5452
5453         return status;
5454 }
5455
5456 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5457 {
5458         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5459 }
5460
5461 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5462                 struct nfs4_slot *new,
5463                 u32 max_slots,
5464                 u32 ivalue)
5465 {
5466         struct nfs4_slot *old = NULL;
5467         u32 i;
5468
5469         spin_lock(&tbl->slot_tbl_lock);
5470         if (new) {
5471                 old = tbl->slots;
5472                 tbl->slots = new;
5473                 tbl->max_slots = max_slots;
5474         }
5475         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5476         for (i = 0; i < tbl->max_slots; i++)
5477                 tbl->slots[i].seq_nr = ivalue;
5478         spin_unlock(&tbl->slot_tbl_lock);
5479         kfree(old);
5480 }
5481
5482 /*
5483  * (re)Initialise a slot table
5484  */
5485 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5486                                  u32 ivalue)
5487 {
5488         struct nfs4_slot *new = NULL;
5489         int ret = -ENOMEM;
5490
5491         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5492                 max_reqs, tbl->max_slots);
5493
5494         /* Does the newly negotiated max_reqs match the existing slot table? */
5495         if (max_reqs != tbl->max_slots) {
5496                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5497                 if (!new)
5498                         goto out;
5499         }
5500         ret = 0;
5501
5502         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5503         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5504                 tbl, tbl->slots, tbl->max_slots);
5505 out:
5506         dprintk("<-- %s: return %d\n", __func__, ret);
5507         return ret;
5508 }
5509
5510 /* Destroy the slot table */
5511 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5512 {
5513         if (session->fc_slot_table.slots != NULL) {
5514                 kfree(session->fc_slot_table.slots);
5515                 session->fc_slot_table.slots = NULL;
5516         }
5517         if (session->bc_slot_table.slots != NULL) {
5518                 kfree(session->bc_slot_table.slots);
5519                 session->bc_slot_table.slots = NULL;
5520         }
5521         return;
5522 }
5523
5524 /*
5525  * Initialize or reset the forechannel and backchannel tables
5526  */
5527 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5528 {
5529         struct nfs4_slot_table *tbl;
5530         int status;
5531
5532         dprintk("--> %s\n", __func__);
5533         /* Fore channel */
5534         tbl = &ses->fc_slot_table;
5535         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5536         if (status) /* -ENOMEM */
5537                 return status;
5538         /* Back channel */
5539         tbl = &ses->bc_slot_table;
5540         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5541         if (status && tbl->slots == NULL)
5542                 /* Fore and back channel share a connection so get
5543                  * both slot tables or neither */
5544                 nfs4_destroy_slot_tables(ses);
5545         return status;
5546 }
5547
5548 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5549 {
5550         struct nfs4_session *session;
5551         struct nfs4_slot_table *tbl;
5552
5553         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5554         if (!session)
5555                 return NULL;
5556
5557         tbl = &session->fc_slot_table;
5558         tbl->highest_used_slotid = NFS4_NO_SLOT;
5559         spin_lock_init(&tbl->slot_tbl_lock);
5560         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5561         init_completion(&tbl->complete);
5562
5563         tbl = &session->bc_slot_table;
5564         tbl->highest_used_slotid = NFS4_NO_SLOT;
5565         spin_lock_init(&tbl->slot_tbl_lock);
5566         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5567         init_completion(&tbl->complete);
5568
5569         session->session_state = 1<<NFS4_SESSION_INITING;
5570
5571         session->clp = clp;
5572         return session;
5573 }
5574
5575 void nfs4_destroy_session(struct nfs4_session *session)
5576 {
5577         struct rpc_xprt *xprt;
5578         struct rpc_cred *cred;
5579
5580         cred = nfs4_get_exchange_id_cred(session->clp);
5581         nfs4_proc_destroy_session(session, cred);
5582         if (cred)
5583                 put_rpccred(cred);
5584
5585         rcu_read_lock();
5586         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5587         rcu_read_unlock();
5588         dprintk("%s Destroy backchannel for xprt %p\n",
5589                 __func__, xprt);
5590         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5591         nfs4_destroy_slot_tables(session);
5592         kfree(session);
5593 }
5594
5595 /*
5596  * Initialize the values to be used by the client in CREATE_SESSION
5597  * If nfs4_init_session set the fore channel request and response sizes,
5598  * use them.
5599  *
5600  * Set the back channel max_resp_sz_cached to zero to force the client to
5601  * always set csa_cachethis to FALSE because the current implementation
5602  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5603  */
5604 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5605 {
5606         struct nfs4_session *session = args->client->cl_session;
5607         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5608                      mxresp_sz = session->fc_attrs.max_resp_sz;
5609
5610         if (mxrqst_sz == 0)
5611                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5612         if (mxresp_sz == 0)
5613                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5614         /* Fore channel attributes */
5615         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5616         args->fc_attrs.max_resp_sz = mxresp_sz;
5617         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5618         args->fc_attrs.max_reqs = max_session_slots;
5619
5620         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5621                 "max_ops=%u max_reqs=%u\n",
5622                 __func__,
5623                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5624                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5625
5626         /* Back channel attributes */
5627         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5628         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5629         args->bc_attrs.max_resp_sz_cached = 0;
5630         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5631         args->bc_attrs.max_reqs = 1;
5632
5633         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5634                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5635                 __func__,
5636                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5637                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5638                 args->bc_attrs.max_reqs);
5639 }
5640
5641 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5642 {
5643         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5644         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5645
5646         if (rcvd->max_resp_sz > sent->max_resp_sz)
5647                 return -EINVAL;
5648         /*
5649          * Our requested max_ops is the minimum we need; we're not
5650          * prepared to break up compounds into smaller pieces than that.
5651          * So, no point even trying to continue if the server won't
5652          * cooperate:
5653          */
5654         if (rcvd->max_ops < sent->max_ops)
5655                 return -EINVAL;
5656         if (rcvd->max_reqs == 0)
5657                 return -EINVAL;
5658         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5659                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5660         return 0;
5661 }
5662
5663 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5664 {
5665         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5666         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5667
5668         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5669                 return -EINVAL;
5670         if (rcvd->max_resp_sz < sent->max_resp_sz)
5671                 return -EINVAL;
5672         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5673                 return -EINVAL;
5674         /* These would render the backchannel useless: */
5675         if (rcvd->max_ops != sent->max_ops)
5676                 return -EINVAL;
5677         if (rcvd->max_reqs != sent->max_reqs)
5678                 return -EINVAL;
5679         return 0;
5680 }
5681
5682 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5683                                      struct nfs4_session *session)
5684 {
5685         int ret;
5686
5687         ret = nfs4_verify_fore_channel_attrs(args, session);
5688         if (ret)
5689                 return ret;
5690         return nfs4_verify_back_channel_attrs(args, session);
5691 }
5692
5693 static int _nfs4_proc_create_session(struct nfs_client *clp,
5694                 struct rpc_cred *cred)
5695 {
5696         struct nfs4_session *session = clp->cl_session;
5697         struct nfs41_create_session_args args = {
5698                 .client = clp,
5699                 .cb_program = NFS4_CALLBACK,
5700         };
5701         struct nfs41_create_session_res res = {
5702                 .client = clp,
5703         };
5704         struct rpc_message msg = {
5705                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5706                 .rpc_argp = &args,
5707                 .rpc_resp = &res,
5708                 .rpc_cred = cred,
5709         };
5710         int status;
5711
5712         nfs4_init_channel_attrs(&args);
5713         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5714
5715         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5716
5717         if (!status)
5718                 /* Verify the session's negotiated channel_attrs values */
5719                 status = nfs4_verify_channel_attrs(&args, session);
5720         if (!status) {
5721                 /* Increment the clientid slot sequence id */
5722                 clp->cl_seqid++;
5723         }
5724
5725         return status;
5726 }
5727
5728 /*
5729  * Issues a CREATE_SESSION operation to the server.
5730  * It is the responsibility of the caller to verify the session is
5731  * expired before calling this routine.
5732  */
5733 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5734 {
5735         int status;
5736         unsigned *ptr;
5737         struct nfs4_session *session = clp->cl_session;
5738
5739         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5740
5741         status = _nfs4_proc_create_session(clp, cred);
5742         if (status)
5743                 goto out;
5744
5745         /* Init or reset the session slot tables */
5746         status = nfs4_setup_session_slot_tables(session);
5747         dprintk("slot table setup returned %d\n", status);
5748         if (status)
5749                 goto out;
5750
5751         ptr = (unsigned *)&session->sess_id.data[0];
5752         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5753                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5754 out:
5755         dprintk("<-- %s\n", __func__);
5756         return status;
5757 }
5758
5759 /*
5760  * Issue the over-the-wire RPC DESTROY_SESSION.
5761  * The caller must serialize access to this routine.
5762  */
5763 int nfs4_proc_destroy_session(struct nfs4_session *session,
5764                 struct rpc_cred *cred)
5765 {
5766         struct rpc_message msg = {
5767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5768                 .rpc_argp = session,
5769                 .rpc_cred = cred,
5770         };
5771         int status = 0;
5772
5773         dprintk("--> nfs4_proc_destroy_session\n");
5774
5775         /* session is still being setup */
5776         if (session->clp->cl_cons_state != NFS_CS_READY)
5777                 return status;
5778
5779         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5780
5781         if (status)
5782                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5783                         "Session has been destroyed regardless...\n", status);
5784
5785         dprintk("<-- nfs4_proc_destroy_session\n");
5786         return status;
5787 }
5788
5789 /*
5790  * With sessions, the client is not marked ready until after a
5791  * successful EXCHANGE_ID and CREATE_SESSION.
5792  *
5793  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5794  * other versions of NFS can be tried.
5795  */
5796 static int nfs41_check_session_ready(struct nfs_client *clp)
5797 {
5798         int ret;
5799
5800         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
5801                 ret = nfs4_client_recover_expired_lease(clp);
5802                 if (ret)
5803                         return ret;
5804         }
5805         if (clp->cl_cons_state < NFS_CS_READY)
5806                 return -EPROTONOSUPPORT;
5807         smp_rmb();
5808         return 0;
5809 }
5810
5811 int nfs4_init_session(struct nfs_server *server)
5812 {
5813         struct nfs_client *clp = server->nfs_client;
5814         struct nfs4_session *session;
5815         unsigned int rsize, wsize;
5816
5817         if (!nfs4_has_session(clp))
5818                 return 0;
5819
5820         session = clp->cl_session;
5821         spin_lock(&clp->cl_lock);
5822         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5823
5824                 rsize = server->rsize;
5825                 if (rsize == 0)
5826                         rsize = NFS_MAX_FILE_IO_SIZE;
5827                 wsize = server->wsize;
5828                 if (wsize == 0)
5829                         wsize = NFS_MAX_FILE_IO_SIZE;
5830
5831                 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5832                 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5833         }
5834         spin_unlock(&clp->cl_lock);
5835
5836         return nfs41_check_session_ready(clp);
5837 }
5838
5839 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
5840 {
5841         struct nfs4_session *session = clp->cl_session;
5842         int ret;
5843
5844         spin_lock(&clp->cl_lock);
5845         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5846                 /*
5847                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
5848                  * DS lease to be equal to the MDS lease.
5849                  */
5850                 clp->cl_lease_time = lease_time;
5851                 clp->cl_last_renewal = jiffies;
5852         }
5853         spin_unlock(&clp->cl_lock);
5854
5855         ret = nfs41_check_session_ready(clp);
5856         if (ret)
5857                 return ret;
5858         /* Test for the DS role */
5859         if (!is_ds_client(clp))
5860                 return -ENODEV;
5861         return 0;
5862 }
5863 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5864
5865
5866 /*
5867  * Renew the cl_session lease.
5868  */
5869 struct nfs4_sequence_data {
5870         struct nfs_client *clp;
5871         struct nfs4_sequence_args args;
5872         struct nfs4_sequence_res res;
5873 };
5874
5875 static void nfs41_sequence_release(void *data)
5876 {
5877         struct nfs4_sequence_data *calldata = data;
5878         struct nfs_client *clp = calldata->clp;
5879
5880         if (atomic_read(&clp->cl_count) > 1)
5881                 nfs4_schedule_state_renewal(clp);
5882         nfs_put_client(clp);
5883         kfree(calldata);
5884 }
5885
5886 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5887 {
5888         switch(task->tk_status) {
5889         case -NFS4ERR_DELAY:
5890                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5891                 return -EAGAIN;
5892         default:
5893                 nfs4_schedule_lease_recovery(clp);
5894         }
5895         return 0;
5896 }
5897
5898 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5899 {
5900         struct nfs4_sequence_data *calldata = data;
5901         struct nfs_client *clp = calldata->clp;
5902
5903         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5904                 return;
5905
5906         if (task->tk_status < 0) {
5907                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5908                 if (atomic_read(&clp->cl_count) == 1)
5909                         goto out;
5910
5911                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5912                         rpc_restart_call_prepare(task);
5913                         return;
5914                 }
5915         }
5916         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5917 out:
5918         dprintk("<-- %s\n", __func__);
5919 }
5920
5921 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5922 {
5923         struct nfs4_sequence_data *calldata = data;
5924         struct nfs_client *clp = calldata->clp;
5925         struct nfs4_sequence_args *args;
5926         struct nfs4_sequence_res *res;
5927
5928         args = task->tk_msg.rpc_argp;
5929         res = task->tk_msg.rpc_resp;
5930
5931         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5932                 return;
5933         rpc_call_start(task);
5934 }
5935
5936 static const struct rpc_call_ops nfs41_sequence_ops = {
5937         .rpc_call_done = nfs41_sequence_call_done,
5938         .rpc_call_prepare = nfs41_sequence_prepare,
5939         .rpc_release = nfs41_sequence_release,
5940 };
5941
5942 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5943 {
5944         struct nfs4_sequence_data *calldata;
5945         struct rpc_message msg = {
5946                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5947                 .rpc_cred = cred,
5948         };
5949         struct rpc_task_setup task_setup_data = {
5950                 .rpc_client = clp->cl_rpcclient,
5951                 .rpc_message = &msg,
5952                 .callback_ops = &nfs41_sequence_ops,
5953                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5954         };
5955
5956         if (!atomic_inc_not_zero(&clp->cl_count))
5957                 return ERR_PTR(-EIO);
5958         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5959         if (calldata == NULL) {
5960                 nfs_put_client(clp);
5961                 return ERR_PTR(-ENOMEM);
5962         }
5963         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5964         msg.rpc_argp = &calldata->args;
5965         msg.rpc_resp = &calldata->res;
5966         calldata->clp = clp;
5967         task_setup_data.callback_data = calldata;
5968
5969         return rpc_run_task(&task_setup_data);
5970 }
5971
5972 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5973 {
5974         struct rpc_task *task;
5975         int ret = 0;
5976
5977         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5978                 return 0;
5979         task = _nfs41_proc_sequence(clp, cred);
5980         if (IS_ERR(task))
5981                 ret = PTR_ERR(task);
5982         else
5983                 rpc_put_task_async(task);
5984         dprintk("<-- %s status=%d\n", __func__, ret);
5985         return ret;
5986 }
5987
5988 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5989 {
5990         struct rpc_task *task;
5991         int ret;
5992
5993         task = _nfs41_proc_sequence(clp, cred);
5994         if (IS_ERR(task)) {
5995                 ret = PTR_ERR(task);
5996                 goto out;
5997         }
5998         ret = rpc_wait_for_completion_task(task);
5999         if (!ret) {
6000                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6001
6002                 if (task->tk_status == 0)
6003                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6004                 ret = task->tk_status;
6005         }
6006         rpc_put_task(task);
6007 out:
6008         dprintk("<-- %s status=%d\n", __func__, ret);
6009         return ret;
6010 }
6011
6012 struct nfs4_reclaim_complete_data {
6013         struct nfs_client *clp;
6014         struct nfs41_reclaim_complete_args arg;
6015         struct nfs41_reclaim_complete_res res;
6016 };
6017
6018 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6019 {
6020         struct nfs4_reclaim_complete_data *calldata = data;
6021
6022         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6023         if (nfs41_setup_sequence(calldata->clp->cl_session,
6024                                 &calldata->arg.seq_args,
6025                                 &calldata->res.seq_res, task))
6026                 return;
6027
6028         rpc_call_start(task);
6029 }
6030
6031 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6032 {
6033         switch(task->tk_status) {
6034         case 0:
6035         case -NFS4ERR_COMPLETE_ALREADY:
6036         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6037                 break;
6038         case -NFS4ERR_DELAY:
6039                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6040                 /* fall through */
6041         case -NFS4ERR_RETRY_UNCACHED_REP:
6042                 return -EAGAIN;
6043         default:
6044                 nfs4_schedule_lease_recovery(clp);
6045         }
6046         return 0;
6047 }
6048
6049 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6050 {
6051         struct nfs4_reclaim_complete_data *calldata = data;
6052         struct nfs_client *clp = calldata->clp;
6053         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6054
6055         dprintk("--> %s\n", __func__);
6056         if (!nfs41_sequence_done(task, res))
6057                 return;
6058
6059         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6060                 rpc_restart_call_prepare(task);
6061                 return;
6062         }
6063         dprintk("<-- %s\n", __func__);
6064 }
6065
6066 static void nfs4_free_reclaim_complete_data(void *data)
6067 {
6068         struct nfs4_reclaim_complete_data *calldata = data;
6069
6070         kfree(calldata);
6071 }
6072
6073 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6074         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6075         .rpc_call_done = nfs4_reclaim_complete_done,
6076         .rpc_release = nfs4_free_reclaim_complete_data,
6077 };
6078
6079 /*
6080  * Issue a global reclaim complete.
6081  */
6082 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6083 {
6084         struct nfs4_reclaim_complete_data *calldata;
6085         struct rpc_task *task;
6086         struct rpc_message msg = {
6087                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6088         };
6089         struct rpc_task_setup task_setup_data = {
6090                 .rpc_client = clp->cl_rpcclient,
6091                 .rpc_message = &msg,
6092                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6093                 .flags = RPC_TASK_ASYNC,
6094         };
6095         int status = -ENOMEM;
6096
6097         dprintk("--> %s\n", __func__);
6098         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6099         if (calldata == NULL)
6100                 goto out;
6101         calldata->clp = clp;
6102         calldata->arg.one_fs = 0;
6103
6104         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6105         msg.rpc_argp = &calldata->arg;
6106         msg.rpc_resp = &calldata->res;
6107         task_setup_data.callback_data = calldata;
6108         task = rpc_run_task(&task_setup_data);
6109         if (IS_ERR(task)) {
6110                 status = PTR_ERR(task);
6111                 goto out;
6112         }
6113         status = nfs4_wait_for_completion_rpc_task(task);
6114         if (status == 0)
6115                 status = task->tk_status;
6116         rpc_put_task(task);
6117         return 0;
6118 out:
6119         dprintk("<-- %s status=%d\n", __func__, status);
6120         return status;
6121 }
6122
6123 static void
6124 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6125 {
6126         struct nfs4_layoutget *lgp = calldata;
6127         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6128
6129         dprintk("--> %s\n", __func__);
6130         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6131          * right now covering the LAYOUTGET we are about to send.
6132          * However, that is not so catastrophic, and there seems
6133          * to be no way to prevent it completely.
6134          */
6135         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6136                                 &lgp->res.seq_res, task))
6137                 return;
6138         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6139                                           NFS_I(lgp->args.inode)->layout,
6140                                           lgp->args.ctx->state)) {
6141                 rpc_exit(task, NFS4_OK);
6142                 return;
6143         }
6144         rpc_call_start(task);
6145 }
6146
6147 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6148 {
6149         struct nfs4_layoutget *lgp = calldata;
6150         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6151
6152         dprintk("--> %s\n", __func__);
6153
6154         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6155                 return;
6156
6157         switch (task->tk_status) {
6158         case 0:
6159                 break;
6160         case -NFS4ERR_LAYOUTTRYLATER:
6161         case -NFS4ERR_RECALLCONFLICT:
6162                 task->tk_status = -NFS4ERR_DELAY;
6163                 /* Fall through */
6164         default:
6165                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6166                         rpc_restart_call_prepare(task);
6167                         return;
6168                 }
6169         }
6170         dprintk("<-- %s\n", __func__);
6171 }
6172
6173 static void nfs4_layoutget_release(void *calldata)
6174 {
6175         struct nfs4_layoutget *lgp = calldata;
6176
6177         dprintk("--> %s\n", __func__);
6178         put_nfs_open_context(lgp->args.ctx);
6179         kfree(calldata);
6180         dprintk("<-- %s\n", __func__);
6181 }
6182
6183 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6184         .rpc_call_prepare = nfs4_layoutget_prepare,
6185         .rpc_call_done = nfs4_layoutget_done,
6186         .rpc_release = nfs4_layoutget_release,
6187 };
6188
6189 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
6190 {
6191         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6192         struct rpc_task *task;
6193         struct rpc_message msg = {
6194                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6195                 .rpc_argp = &lgp->args,
6196                 .rpc_resp = &lgp->res,
6197         };
6198         struct rpc_task_setup task_setup_data = {
6199                 .rpc_client = server->client,
6200                 .rpc_message = &msg,
6201                 .callback_ops = &nfs4_layoutget_call_ops,
6202                 .callback_data = lgp,
6203                 .flags = RPC_TASK_ASYNC,
6204         };
6205         int status = 0;
6206
6207         dprintk("--> %s\n", __func__);
6208
6209         lgp->res.layoutp = &lgp->args.layout;
6210         lgp->res.seq_res.sr_slot = NULL;
6211         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6212         task = rpc_run_task(&task_setup_data);
6213         if (IS_ERR(task))
6214                 return PTR_ERR(task);
6215         status = nfs4_wait_for_completion_rpc_task(task);
6216         if (status == 0)
6217                 status = task->tk_status;
6218         if (status == 0)
6219                 status = pnfs_layout_process(lgp);
6220         rpc_put_task(task);
6221         dprintk("<-- %s status=%d\n", __func__, status);
6222         return status;
6223 }
6224
6225 static void
6226 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6227 {
6228         struct nfs4_layoutreturn *lrp = calldata;
6229
6230         dprintk("--> %s\n", __func__);
6231         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6232                                 &lrp->res.seq_res, task))
6233                 return;
6234         rpc_call_start(task);
6235 }
6236
6237 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6238 {
6239         struct nfs4_layoutreturn *lrp = calldata;
6240         struct nfs_server *server;
6241         struct pnfs_layout_hdr *lo = lrp->args.layout;
6242
6243         dprintk("--> %s\n", __func__);
6244
6245         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6246                 return;
6247
6248         server = NFS_SERVER(lrp->args.inode);
6249         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6250                 rpc_restart_call_prepare(task);
6251                 return;
6252         }
6253         spin_lock(&lo->plh_inode->i_lock);
6254         if (task->tk_status == 0) {
6255                 if (lrp->res.lrs_present) {
6256                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6257                 } else
6258                         BUG_ON(!list_empty(&lo->plh_segs));
6259         }
6260         lo->plh_block_lgets--;
6261         spin_unlock(&lo->plh_inode->i_lock);
6262         dprintk("<-- %s\n", __func__);
6263 }
6264
6265 static void nfs4_layoutreturn_release(void *calldata)
6266 {
6267         struct nfs4_layoutreturn *lrp = calldata;
6268
6269         dprintk("--> %s\n", __func__);
6270         put_layout_hdr(lrp->args.layout);
6271         kfree(calldata);
6272         dprintk("<-- %s\n", __func__);
6273 }
6274
6275 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6276         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6277         .rpc_call_done = nfs4_layoutreturn_done,
6278         .rpc_release = nfs4_layoutreturn_release,
6279 };
6280
6281 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6282 {
6283         struct rpc_task *task;
6284         struct rpc_message msg = {
6285                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6286                 .rpc_argp = &lrp->args,
6287                 .rpc_resp = &lrp->res,
6288         };
6289         struct rpc_task_setup task_setup_data = {
6290                 .rpc_client = lrp->clp->cl_rpcclient,
6291                 .rpc_message = &msg,
6292                 .callback_ops = &nfs4_layoutreturn_call_ops,
6293                 .callback_data = lrp,
6294         };
6295         int status;
6296
6297         dprintk("--> %s\n", __func__);
6298         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6299         task = rpc_run_task(&task_setup_data);
6300         if (IS_ERR(task))
6301                 return PTR_ERR(task);
6302         status = task->tk_status;
6303         dprintk("<-- %s status=%d\n", __func__, status);
6304         rpc_put_task(task);
6305         return status;
6306 }
6307
6308 /*
6309  * Retrieve the list of Data Server devices from the MDS.
6310  */
6311 static int _nfs4_getdevicelist(struct nfs_server *server,
6312                                     const struct nfs_fh *fh,
6313                                     struct pnfs_devicelist *devlist)
6314 {
6315         struct nfs4_getdevicelist_args args = {
6316                 .fh = fh,
6317                 .layoutclass = server->pnfs_curr_ld->id,
6318         };
6319         struct nfs4_getdevicelist_res res = {
6320                 .devlist = devlist,
6321         };
6322         struct rpc_message msg = {
6323                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6324                 .rpc_argp = &args,
6325                 .rpc_resp = &res,
6326         };
6327         int status;
6328
6329         dprintk("--> %s\n", __func__);
6330         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6331                                 &res.seq_res, 0);
6332         dprintk("<-- %s status=%d\n", __func__, status);
6333         return status;
6334 }
6335
6336 int nfs4_proc_getdevicelist(struct nfs_server *server,
6337                             const struct nfs_fh *fh,
6338                             struct pnfs_devicelist *devlist)
6339 {
6340         struct nfs4_exception exception = { };
6341         int err;
6342
6343         do {
6344                 err = nfs4_handle_exception(server,
6345                                 _nfs4_getdevicelist(server, fh, devlist),
6346                                 &exception);
6347         } while (exception.retry);
6348
6349         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6350                 err, devlist->num_devs);
6351
6352         return err;
6353 }
6354 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6355
6356 static int
6357 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6358 {
6359         struct nfs4_getdeviceinfo_args args = {
6360                 .pdev = pdev,
6361         };
6362         struct nfs4_getdeviceinfo_res res = {
6363                 .pdev = pdev,
6364         };
6365         struct rpc_message msg = {
6366                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6367                 .rpc_argp = &args,
6368                 .rpc_resp = &res,
6369         };
6370         int status;
6371
6372         dprintk("--> %s\n", __func__);
6373         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6374         dprintk("<-- %s status=%d\n", __func__, status);
6375
6376         return status;
6377 }
6378
6379 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6380 {
6381         struct nfs4_exception exception = { };
6382         int err;
6383
6384         do {
6385                 err = nfs4_handle_exception(server,
6386                                         _nfs4_proc_getdeviceinfo(server, pdev),
6387                                         &exception);
6388         } while (exception.retry);
6389         return err;
6390 }
6391 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6392
6393 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6394 {
6395         struct nfs4_layoutcommit_data *data = calldata;
6396         struct nfs_server *server = NFS_SERVER(data->args.inode);
6397
6398         if (nfs4_setup_sequence(server, &data->args.seq_args,
6399                                 &data->res.seq_res, task))
6400                 return;
6401         rpc_call_start(task);
6402 }
6403
6404 static void
6405 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6406 {
6407         struct nfs4_layoutcommit_data *data = calldata;
6408         struct nfs_server *server = NFS_SERVER(data->args.inode);
6409
6410         if (!nfs4_sequence_done(task, &data->res.seq_res))
6411                 return;
6412
6413         switch (task->tk_status) { /* Just ignore these failures */
6414         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6415         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6416         case -NFS4ERR_BADLAYOUT:     /* no layout */
6417         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6418                 task->tk_status = 0;
6419                 break;
6420         case 0:
6421                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6422                                                    data->res.fattr);
6423                 break;
6424         default:
6425                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6426                         rpc_restart_call_prepare(task);
6427                         return;
6428                 }
6429         }
6430 }
6431
6432 static void nfs4_layoutcommit_release(void *calldata)
6433 {
6434         struct nfs4_layoutcommit_data *data = calldata;
6435         struct pnfs_layout_segment *lseg, *tmp;
6436         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6437
6438         pnfs_cleanup_layoutcommit(data);
6439         /* Matched by references in pnfs_set_layoutcommit */
6440         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6441                 list_del_init(&lseg->pls_lc_list);
6442                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6443                                        &lseg->pls_flags))
6444                         put_lseg(lseg);
6445         }
6446
6447         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6448         smp_mb__after_clear_bit();
6449         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6450
6451         put_rpccred(data->cred);
6452         kfree(data);
6453 }
6454
6455 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6456         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6457         .rpc_call_done = nfs4_layoutcommit_done,
6458         .rpc_release = nfs4_layoutcommit_release,
6459 };
6460
6461 int
6462 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6463 {
6464         struct rpc_message msg = {
6465                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6466                 .rpc_argp = &data->args,
6467                 .rpc_resp = &data->res,
6468                 .rpc_cred = data->cred,
6469         };
6470         struct rpc_task_setup task_setup_data = {
6471                 .task = &data->task,
6472                 .rpc_client = NFS_CLIENT(data->args.inode),
6473                 .rpc_message = &msg,
6474                 .callback_ops = &nfs4_layoutcommit_ops,
6475                 .callback_data = data,
6476                 .flags = RPC_TASK_ASYNC,
6477         };
6478         struct rpc_task *task;
6479         int status = 0;
6480
6481         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6482                 "lbw: %llu inode %lu\n",
6483                 data->task.tk_pid, sync,
6484                 data->args.lastbytewritten,
6485                 data->args.inode->i_ino);
6486
6487         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6488         task = rpc_run_task(&task_setup_data);
6489         if (IS_ERR(task))
6490                 return PTR_ERR(task);
6491         if (sync == false)
6492                 goto out;
6493         status = nfs4_wait_for_completion_rpc_task(task);
6494         if (status != 0)
6495                 goto out;
6496         status = task->tk_status;
6497 out:
6498         dprintk("%s: status %d\n", __func__, status);
6499         rpc_put_task(task);
6500         return status;
6501 }
6502
6503 static int
6504 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6505                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6506 {
6507         struct nfs41_secinfo_no_name_args args = {
6508                 .style = SECINFO_STYLE_CURRENT_FH,
6509         };
6510         struct nfs4_secinfo_res res = {
6511                 .flavors = flavors,
6512         };
6513         struct rpc_message msg = {
6514                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6515                 .rpc_argp = &args,
6516                 .rpc_resp = &res,
6517         };
6518         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6519 }
6520
6521 static int
6522 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6523                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6524 {
6525         struct nfs4_exception exception = { };
6526         int err;
6527         do {
6528                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6529                 switch (err) {
6530                 case 0:
6531                 case -NFS4ERR_WRONGSEC:
6532                 case -NFS4ERR_NOTSUPP:
6533                         goto out;
6534                 default:
6535                         err = nfs4_handle_exception(server, err, &exception);
6536                 }
6537         } while (exception.retry);
6538 out:
6539         return err;
6540 }
6541
6542 static int
6543 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6544                     struct nfs_fsinfo *info)
6545 {
6546         int err;
6547         struct page *page;
6548         rpc_authflavor_t flavor;
6549         struct nfs4_secinfo_flavors *flavors;
6550
6551         page = alloc_page(GFP_KERNEL);
6552         if (!page) {
6553                 err = -ENOMEM;
6554                 goto out;
6555         }
6556
6557         flavors = page_address(page);
6558         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6559
6560         /*
6561          * Fall back on "guess and check" method if
6562          * the server doesn't support SECINFO_NO_NAME
6563          */
6564         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6565                 err = nfs4_find_root_sec(server, fhandle, info);
6566                 goto out_freepage;
6567         }
6568         if (err)
6569                 goto out_freepage;
6570
6571         flavor = nfs_find_best_sec(flavors);
6572         if (err == 0)
6573                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6574
6575 out_freepage:
6576         put_page(page);
6577         if (err == -EACCES)
6578                 return -EPERM;
6579 out:
6580         return err;
6581 }
6582
6583 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6584 {
6585         int status;
6586         struct nfs41_test_stateid_args args = {
6587                 .stateid = stateid,
6588         };
6589         struct nfs41_test_stateid_res res;
6590         struct rpc_message msg = {
6591                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6592                 .rpc_argp = &args,
6593                 .rpc_resp = &res,
6594         };
6595
6596         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6597         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6598
6599         if (status == NFS_OK)
6600                 return res.status;
6601         return status;
6602 }
6603
6604 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6605 {
6606         struct nfs4_exception exception = { };
6607         int err;
6608         do {
6609                 err = nfs4_handle_exception(server,
6610                                 _nfs41_test_stateid(server, stateid),
6611                                 &exception);
6612         } while (exception.retry);
6613         return err;
6614 }
6615
6616 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6617 {
6618         struct nfs41_free_stateid_args args = {
6619                 .stateid = stateid,
6620         };
6621         struct nfs41_free_stateid_res res;
6622         struct rpc_message msg = {
6623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6624                 .rpc_argp = &args,
6625                 .rpc_resp = &res,
6626         };
6627
6628         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6629         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6630 }
6631
6632 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6633 {
6634         struct nfs4_exception exception = { };
6635         int err;
6636         do {
6637                 err = nfs4_handle_exception(server,
6638                                 _nfs4_free_stateid(server, stateid),
6639                                 &exception);
6640         } while (exception.retry);
6641         return err;
6642 }
6643
6644 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6645                 const nfs4_stateid *s2)
6646 {
6647         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6648                 return false;
6649
6650         if (s1->seqid == s2->seqid)
6651                 return true;
6652         if (s1->seqid == 0 || s2->seqid == 0)
6653                 return true;
6654
6655         return false;
6656 }
6657
6658 #endif /* CONFIG_NFS_V4_1 */
6659
6660 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6661                 const nfs4_stateid *s2)
6662 {
6663         return nfs4_stateid_match(s1, s2);
6664 }
6665
6666
6667 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6668         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6669         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6670         .recover_open   = nfs4_open_reclaim,
6671         .recover_lock   = nfs4_lock_reclaim,
6672         .establish_clid = nfs4_init_clientid,
6673         .get_clid_cred  = nfs4_get_setclientid_cred,
6674 };
6675
6676 #if defined(CONFIG_NFS_V4_1)
6677 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6678         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6679         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6680         .recover_open   = nfs4_open_reclaim,
6681         .recover_lock   = nfs4_lock_reclaim,
6682         .establish_clid = nfs41_init_clientid,
6683         .get_clid_cred  = nfs4_get_exchange_id_cred,
6684         .reclaim_complete = nfs41_proc_reclaim_complete,
6685 };
6686 #endif /* CONFIG_NFS_V4_1 */
6687
6688 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6689         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6690         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6691         .recover_open   = nfs4_open_expired,
6692         .recover_lock   = nfs4_lock_expired,
6693         .establish_clid = nfs4_init_clientid,
6694         .get_clid_cred  = nfs4_get_setclientid_cred,
6695 };
6696
6697 #if defined(CONFIG_NFS_V4_1)
6698 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6699         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6700         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6701         .recover_open   = nfs41_open_expired,
6702         .recover_lock   = nfs41_lock_expired,
6703         .establish_clid = nfs41_init_clientid,
6704         .get_clid_cred  = nfs4_get_exchange_id_cred,
6705 };
6706 #endif /* CONFIG_NFS_V4_1 */
6707
6708 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6709         .sched_state_renewal = nfs4_proc_async_renew,
6710         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6711         .renew_lease = nfs4_proc_renew,
6712 };
6713
6714 #if defined(CONFIG_NFS_V4_1)
6715 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6716         .sched_state_renewal = nfs41_proc_async_sequence,
6717         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6718         .renew_lease = nfs4_proc_sequence,
6719 };
6720 #endif
6721
6722 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6723         .minor_version = 0,
6724         .call_sync = _nfs4_call_sync,
6725         .match_stateid = nfs4_match_stateid,
6726         .find_root_sec = nfs4_find_root_sec,
6727         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6728         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6729         .state_renewal_ops = &nfs40_state_renewal_ops,
6730 };
6731
6732 #if defined(CONFIG_NFS_V4_1)
6733 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6734         .minor_version = 1,
6735         .call_sync = _nfs4_call_sync_session,
6736         .match_stateid = nfs41_match_stateid,
6737         .find_root_sec = nfs41_find_root_sec,
6738         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6739         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6740         .state_renewal_ops = &nfs41_state_renewal_ops,
6741 };
6742 #endif
6743
6744 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6745         [0] = &nfs_v4_0_minor_ops,
6746 #if defined(CONFIG_NFS_V4_1)
6747         [1] = &nfs_v4_1_minor_ops,
6748 #endif
6749 };
6750
6751 static const struct inode_operations nfs4_file_inode_operations = {
6752         .permission     = nfs_permission,
6753         .getattr        = nfs_getattr,
6754         .setattr        = nfs_setattr,
6755         .getxattr       = generic_getxattr,
6756         .setxattr       = generic_setxattr,
6757         .listxattr      = generic_listxattr,
6758         .removexattr    = generic_removexattr,
6759 };
6760
6761 const struct nfs_rpc_ops nfs_v4_clientops = {
6762         .version        = 4,                    /* protocol version */
6763         .dentry_ops     = &nfs4_dentry_operations,
6764         .dir_inode_ops  = &nfs4_dir_inode_operations,
6765         .file_inode_ops = &nfs4_file_inode_operations,
6766         .file_ops       = &nfs4_file_operations,
6767         .getroot        = nfs4_proc_get_root,
6768         .submount       = nfs4_submount,
6769         .getattr        = nfs4_proc_getattr,
6770         .setattr        = nfs4_proc_setattr,
6771         .lookup         = nfs4_proc_lookup,
6772         .access         = nfs4_proc_access,
6773         .readlink       = nfs4_proc_readlink,
6774         .create         = nfs4_proc_create,
6775         .remove         = nfs4_proc_remove,
6776         .unlink_setup   = nfs4_proc_unlink_setup,
6777         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6778         .unlink_done    = nfs4_proc_unlink_done,
6779         .rename         = nfs4_proc_rename,
6780         .rename_setup   = nfs4_proc_rename_setup,
6781         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6782         .rename_done    = nfs4_proc_rename_done,
6783         .link           = nfs4_proc_link,
6784         .symlink        = nfs4_proc_symlink,
6785         .mkdir          = nfs4_proc_mkdir,
6786         .rmdir          = nfs4_proc_remove,
6787         .readdir        = nfs4_proc_readdir,
6788         .mknod          = nfs4_proc_mknod,
6789         .statfs         = nfs4_proc_statfs,
6790         .fsinfo         = nfs4_proc_fsinfo,
6791         .pathconf       = nfs4_proc_pathconf,
6792         .set_capabilities = nfs4_server_capabilities,
6793         .decode_dirent  = nfs4_decode_dirent,
6794         .read_setup     = nfs4_proc_read_setup,
6795         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6796         .read_done      = nfs4_read_done,
6797         .write_setup    = nfs4_proc_write_setup,
6798         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6799         .write_done     = nfs4_write_done,
6800         .commit_setup   = nfs4_proc_commit_setup,
6801         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6802         .commit_done    = nfs4_commit_done,
6803         .lock           = nfs4_proc_lock,
6804         .clear_acl_cache = nfs4_zap_acl_attr,
6805         .close_context  = nfs4_close_context,
6806         .open_context   = nfs4_atomic_open,
6807         .have_delegation = nfs4_have_delegation,
6808         .return_delegation = nfs4_inode_return_delegation,
6809         .alloc_client   = nfs4_alloc_client,
6810         .init_client    = nfs4_init_client,
6811         .free_client    = nfs4_free_client,
6812 };
6813
6814 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6815         .prefix = XATTR_NAME_NFSV4_ACL,
6816         .list   = nfs4_xattr_list_nfs4_acl,
6817         .get    = nfs4_xattr_get_nfs4_acl,
6818         .set    = nfs4_xattr_set_nfs4_acl,
6819 };
6820
6821 const struct xattr_handler *nfs4_xattr_handlers[] = {
6822         &nfs4_xattr_nfs4_acl_handler,
6823         NULL
6824 };
6825
6826 module_param(max_session_slots, ushort, 0644);
6827 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6828                 "requests the client will negotiate");
6829
6830 /*
6831  * Local variables:
6832  *  c-basic-offset: 8
6833  * End:
6834  */