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 && nfs_have_delegation(inode, FMODE_READ)) {
 298                                 nfs_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         nfs_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.  This means that
2770  * we can't use xdr_encode_pages() as written: we need a variant
2771  * of it which would leave room in the 'tail' iovec.
2772  *
2773  * Both of these changes to the XDR layer would in fact be quite
2774  * minor, but I decided to leave them for a subsequent patch.
2775  */
2776 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2777                 unsigned int pgbase, unsigned int pglen)
2778 {
2779         struct nfs4_readlink args = {
2780                 .fh       = NFS_FH(inode),
2781                 .pgbase   = pgbase,
2782                 .pglen    = pglen,
2783                 .pages    = &page,
2784         };
2785         struct nfs4_readlink_res res;
2786         struct rpc_message msg = {
2787                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2788                 .rpc_argp = &args,
2789                 .rpc_resp = &res,
2790         };
2791
2792         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2793 }
2794
2795 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2796                 unsigned int pgbase, unsigned int pglen)
2797 {
2798         struct nfs4_exception exception = { };
2799         int err;
2800         do {
2801                 err = nfs4_handle_exception(NFS_SERVER(inode),
2802                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2803                                 &exception);
2804         } while (exception.retry);
2805         return err;
2806 }
2807
2808 /*
2809  * Got race?
2810  * We will need to arrange for the VFS layer to provide an atomic open.
2811  * Until then, this create/open method is prone to inefficiency and race
2812  * conditions due to the lookup, create, and open VFS calls from sys_open()
2813  * placed on the wire.
2814  *
2815  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2816  * The file will be opened again in the subsequent VFS open call
2817  * (nfs4_proc_file_open).
2818  *
2819  * The open for read will just hang around to be used by any process that
2820  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2821  */
2822
2823 static int
2824 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2825                  int flags, struct nfs_open_context *ctx)
2826 {
2827         struct dentry *de = dentry;
2828         struct nfs4_state *state;
2829         struct rpc_cred *cred = NULL;
2830         fmode_t fmode = 0;
2831         int status = 0;
2832
2833         if (ctx != NULL) {
2834                 cred = ctx->cred;
2835                 de = ctx->dentry;
2836                 fmode = ctx->mode;
2837         }
2838         sattr->ia_mode &= ~current_umask();
2839         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred, NULL);
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         nfs_fattr_init(fsinfo->fattr);
3336         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3337 }
3338
3339 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3340                 struct nfs_pathconf *pathconf)
3341 {
3342         struct nfs4_pathconf_arg args = {
3343                 .fh = fhandle,
3344                 .bitmask = server->attr_bitmask,
3345         };
3346         struct nfs4_pathconf_res res = {
3347                 .pathconf = pathconf,
3348         };
3349         struct rpc_message msg = {
3350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3351                 .rpc_argp = &args,
3352                 .rpc_resp = &res,
3353         };
3354
3355         /* None of the pathconf attributes are mandatory to implement */
3356         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3357                 memset(pathconf, 0, sizeof(*pathconf));
3358                 return 0;
3359         }
3360
3361         nfs_fattr_init(pathconf->fattr);
3362         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3363 }
3364
3365 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3366                 struct nfs_pathconf *pathconf)
3367 {
3368         struct nfs4_exception exception = { };
3369         int err;
3370
3371         do {
3372                 err = nfs4_handle_exception(server,
3373                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3374                                 &exception);
3375         } while (exception.retry);
3376         return err;
3377 }
3378
3379 void __nfs4_read_done_cb(struct nfs_read_data *data)
3380 {
3381         nfs_invalidate_atime(data->header->inode);
3382 }
3383
3384 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3385 {
3386         struct nfs_server *server = NFS_SERVER(data->header->inode);
3387
3388         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3389                 rpc_restart_call_prepare(task);
3390                 return -EAGAIN;
3391         }
3392
3393         __nfs4_read_done_cb(data);
3394         if (task->tk_status > 0)
3395                 renew_lease(server, data->timestamp);
3396         return 0;
3397 }
3398
3399 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3400 {
3401
3402         dprintk("--> %s\n", __func__);
3403
3404         if (!nfs4_sequence_done(task, &data->res.seq_res))
3405                 return -EAGAIN;
3406
3407         return data->read_done_cb ? data->read_done_cb(task, data) :
3408                                     nfs4_read_done_cb(task, data);
3409 }
3410
3411 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3412 {
3413         data->timestamp   = jiffies;
3414         data->read_done_cb = nfs4_read_done_cb;
3415         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3416         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3417 }
3418
3419 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3420 {
3421         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3422                                 &data->args.seq_args,
3423                                 &data->res.seq_res,
3424                                 task))
3425                 return;
3426         rpc_call_start(task);
3427 }
3428
3429 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3430 {
3431         struct inode *inode = data->header->inode;
3432
3433         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3434                 rpc_restart_call_prepare(task);
3435                 return -EAGAIN;
3436         }
3437         if (task->tk_status >= 0) {
3438                 renew_lease(NFS_SERVER(inode), data->timestamp);
3439                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3440         }
3441         return 0;
3442 }
3443
3444 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3445 {
3446         if (!nfs4_sequence_done(task, &data->res.seq_res))
3447                 return -EAGAIN;
3448         return data->write_done_cb ? data->write_done_cb(task, data) :
3449                 nfs4_write_done_cb(task, data);
3450 }
3451
3452 static
3453 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3454 {
3455         const struct nfs_pgio_header *hdr = data->header;
3456
3457         /* Don't request attributes for pNFS or O_DIRECT writes */
3458         if (data->ds_clp != NULL || hdr->dreq != NULL)
3459                 return false;
3460         /* Otherwise, request attributes if and only if we don't hold
3461          * a delegation
3462          */
3463         return nfs_have_delegation(hdr->inode, FMODE_READ) == 0;
3464 }
3465
3466 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3467 {
3468         struct nfs_server *server = NFS_SERVER(data->header->inode);
3469
3470         if (!nfs4_write_need_cache_consistency_data(data)) {
3471                 data->args.bitmask = NULL;
3472                 data->res.fattr = NULL;
3473         } else
3474                 data->args.bitmask = server->cache_consistency_bitmask;
3475
3476         if (!data->write_done_cb)
3477                 data->write_done_cb = nfs4_write_done_cb;
3478         data->res.server = server;
3479         data->timestamp   = jiffies;
3480
3481         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3482         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3483 }
3484
3485 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3486 {
3487         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3488                                 &data->args.seq_args,
3489                                 &data->res.seq_res,
3490                                 task))
3491                 return;
3492         rpc_call_start(task);
3493 }
3494
3495 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3496 {
3497         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3498                                 &data->args.seq_args,
3499                                 &data->res.seq_res,
3500                                 task))
3501                 return;
3502         rpc_call_start(task);
3503 }
3504
3505 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3506 {
3507         struct inode *inode = data->inode;
3508
3509         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3510                 rpc_restart_call_prepare(task);
3511                 return -EAGAIN;
3512         }
3513         return 0;
3514 }
3515
3516 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3517 {
3518         if (!nfs4_sequence_done(task, &data->res.seq_res))
3519                 return -EAGAIN;
3520         return data->commit_done_cb(task, data);
3521 }
3522
3523 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3524 {
3525         struct nfs_server *server = NFS_SERVER(data->inode);
3526
3527         if (data->commit_done_cb == NULL)
3528                 data->commit_done_cb = nfs4_commit_done_cb;
3529         data->res.server = server;
3530         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3531         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3532 }
3533
3534 struct nfs4_renewdata {
3535         struct nfs_client       *client;
3536         unsigned long           timestamp;
3537 };
3538
3539 /*
3540  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3541  * standalone procedure for queueing an asynchronous RENEW.
3542  */
3543 static void nfs4_renew_release(void *calldata)
3544 {
3545         struct nfs4_renewdata *data = calldata;
3546         struct nfs_client *clp = data->client;
3547
3548         if (atomic_read(&clp->cl_count) > 1)
3549                 nfs4_schedule_state_renewal(clp);
3550         nfs_put_client(clp);
3551         kfree(data);
3552 }
3553
3554 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3555 {
3556         struct nfs4_renewdata *data = calldata;
3557         struct nfs_client *clp = data->client;
3558         unsigned long timestamp = data->timestamp;
3559
3560         if (task->tk_status < 0) {
3561                 /* Unless we're shutting down, schedule state recovery! */
3562                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3563                         return;
3564                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3565                         nfs4_schedule_lease_recovery(clp);
3566                         return;
3567                 }
3568                 nfs4_schedule_path_down_recovery(clp);
3569         }
3570         do_renew_lease(clp, timestamp);
3571 }
3572
3573 static const struct rpc_call_ops nfs4_renew_ops = {
3574         .rpc_call_done = nfs4_renew_done,
3575         .rpc_release = nfs4_renew_release,
3576 };
3577
3578 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3579 {
3580         struct rpc_message msg = {
3581                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3582                 .rpc_argp       = clp,
3583                 .rpc_cred       = cred,
3584         };
3585         struct nfs4_renewdata *data;
3586
3587         if (renew_flags == 0)
3588                 return 0;
3589         if (!atomic_inc_not_zero(&clp->cl_count))
3590                 return -EIO;
3591         data = kmalloc(sizeof(*data), GFP_NOFS);
3592         if (data == NULL)
3593                 return -ENOMEM;
3594         data->client = clp;
3595         data->timestamp = jiffies;
3596         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3597                         &nfs4_renew_ops, data);
3598 }
3599
3600 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3601 {
3602         struct rpc_message msg = {
3603                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3604                 .rpc_argp       = clp,
3605                 .rpc_cred       = cred,
3606         };
3607         unsigned long now = jiffies;
3608         int status;
3609
3610         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3611         if (status < 0)
3612                 return status;
3613         do_renew_lease(clp, now);
3614         return 0;
3615 }
3616
3617 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3618 {
3619         return (server->caps & NFS_CAP_ACLS)
3620                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3621                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3622 }
3623
3624 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3625  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3626  * the stack.
3627  */
3628 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3629
3630 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3631                 struct page **pages, unsigned int *pgbase)
3632 {
3633         struct page *newpage, **spages;
3634         int rc = 0;
3635         size_t len;
3636         spages = pages;
3637
3638         do {
3639                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3640                 newpage = alloc_page(GFP_KERNEL);
3641
3642                 if (newpage == NULL)
3643                         goto unwind;
3644                 memcpy(page_address(newpage), buf, len);
3645                 buf += len;
3646                 buflen -= len;
3647                 *pages++ = newpage;
3648                 rc++;
3649         } while (buflen != 0);
3650
3651         return rc;
3652
3653 unwind:
3654         for(; rc > 0; rc--)
3655                 __free_page(spages[rc-1]);
3656         return -ENOMEM;
3657 }
3658
3659 struct nfs4_cached_acl {
3660         int cached;
3661         size_t len;
3662         char data[0];
3663 };
3664
3665 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3666 {
3667         struct nfs_inode *nfsi = NFS_I(inode);
3668
3669         spin_lock(&inode->i_lock);
3670         kfree(nfsi->nfs4_acl);
3671         nfsi->nfs4_acl = acl;
3672         spin_unlock(&inode->i_lock);
3673 }
3674
3675 static void nfs4_zap_acl_attr(struct inode *inode)
3676 {
3677         nfs4_set_cached_acl(inode, NULL);
3678 }
3679
3680 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3681 {
3682         struct nfs_inode *nfsi = NFS_I(inode);
3683         struct nfs4_cached_acl *acl;
3684         int ret = -ENOENT;
3685
3686         spin_lock(&inode->i_lock);
3687         acl = nfsi->nfs4_acl;
3688         if (acl == NULL)
3689                 goto out;
3690         if (buf == NULL) /* user is just asking for length */
3691                 goto out_len;
3692         if (acl->cached == 0)
3693                 goto out;
3694         ret = -ERANGE; /* see getxattr(2) man page */
3695         if (acl->len > buflen)
3696                 goto out;
3697         memcpy(buf, acl->data, acl->len);
3698 out_len:
3699         ret = acl->len;
3700 out:
3701         spin_unlock(&inode->i_lock);
3702         return ret;
3703 }
3704
3705 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3706 {
3707         struct nfs4_cached_acl *acl;
3708
3709         if (pages && acl_len <= PAGE_SIZE) {
3710                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3711                 if (acl == NULL)
3712                         goto out;
3713                 acl->cached = 1;
3714                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3715         } else {
3716                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3717                 if (acl == NULL)
3718                         goto out;
3719                 acl->cached = 0;
3720         }
3721         acl->len = acl_len;
3722 out:
3723         nfs4_set_cached_acl(inode, acl);
3724 }
3725
3726 /*
3727  * The getxattr API returns the required buffer length when called with a
3728  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3729  * the required buf.  On a NULL buf, we send a page of data to the server
3730  * guessing that the ACL request can be serviced by a page. If so, we cache
3731  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3732  * the cache. If not so, we throw away the page, and cache the required
3733  * length. The next getxattr call will then produce another round trip to
3734  * the server, this time with the input buf of the required size.
3735  */
3736 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3737 {
3738         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3739         struct nfs_getaclargs args = {
3740                 .fh = NFS_FH(inode),
3741                 .acl_pages = pages,
3742                 .acl_len = buflen,
3743         };
3744         struct nfs_getaclres res = {
3745                 .acl_len = buflen,
3746         };
3747         struct rpc_message msg = {
3748                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3749                 .rpc_argp = &args,
3750                 .rpc_resp = &res,
3751         };
3752         int ret = -ENOMEM, npages, i, acl_len = 0;
3753
3754         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3755         /* As long as we're doing a round trip to the server anyway,
3756          * let's be prepared for a page of acl data. */
3757         if (npages == 0)
3758                 npages = 1;
3759
3760         /* Add an extra page to handle the bitmap returned */
3761         npages++;
3762
3763         for (i = 0; i < npages; i++) {
3764                 pages[i] = alloc_page(GFP_KERNEL);
3765                 if (!pages[i])
3766                         goto out_free;
3767         }
3768
3769         /* for decoding across pages */
3770         res.acl_scratch = alloc_page(GFP_KERNEL);
3771         if (!res.acl_scratch)
3772                 goto out_free;
3773
3774         args.acl_len = npages * PAGE_SIZE;
3775         args.acl_pgbase = 0;
3776
3777         /* Let decode_getfacl know not to fail if the ACL data is larger than
3778          * the page we send as a guess */
3779         if (buf == NULL)
3780                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3781
3782         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3783                 __func__, buf, buflen, npages, args.acl_len);
3784         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3785                              &msg, &args.seq_args, &res.seq_res, 0);
3786         if (ret)
3787                 goto out_free;
3788
3789         acl_len = res.acl_len - res.acl_data_offset;
3790         if (acl_len > args.acl_len)
3791                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3792         else
3793                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3794                                       acl_len);
3795         if (buf) {
3796                 ret = -ERANGE;
3797                 if (acl_len > buflen)
3798                         goto out_free;
3799                 _copy_from_pages(buf, pages, res.acl_data_offset,
3800                                 acl_len);
3801         }
3802         ret = acl_len;
3803 out_free:
3804         for (i = 0; i < npages; i++)
3805                 if (pages[i])
3806                         __free_page(pages[i]);
3807         if (res.acl_scratch)
3808                 __free_page(res.acl_scratch);
3809         return ret;
3810 }
3811
3812 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3813 {
3814         struct nfs4_exception exception = { };
3815         ssize_t ret;
3816         do {
3817                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3818                 if (ret >= 0)
3819                         break;
3820                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3821         } while (exception.retry);
3822         return ret;
3823 }
3824
3825 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3826 {
3827         struct nfs_server *server = NFS_SERVER(inode);
3828         int ret;
3829
3830         if (!nfs4_server_supports_acls(server))
3831                 return -EOPNOTSUPP;
3832         ret = nfs_revalidate_inode(server, inode);
3833         if (ret < 0)
3834                 return ret;
3835         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3836                 nfs_zap_acl_cache(inode);
3837         ret = nfs4_read_cached_acl(inode, buf, buflen);
3838         if (ret != -ENOENT)
3839                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3840                  * but no cached acl data, just the acl length */
3841                 return ret;
3842         return nfs4_get_acl_uncached(inode, buf, buflen);
3843 }
3844
3845 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3846 {
3847         struct nfs_server *server = NFS_SERVER(inode);
3848         struct page *pages[NFS4ACL_MAXPAGES];
3849         struct nfs_setaclargs arg = {
3850                 .fh             = NFS_FH(inode),
3851                 .acl_pages      = pages,
3852                 .acl_len        = buflen,
3853         };
3854         struct nfs_setaclres res;
3855         struct rpc_message msg = {
3856                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3857                 .rpc_argp       = &arg,
3858                 .rpc_resp       = &res,
3859         };
3860         int ret, i;
3861
3862         if (!nfs4_server_supports_acls(server))
3863                 return -EOPNOTSUPP;
3864         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3865         if (i < 0)
3866                 return i;
3867         nfs_inode_return_delegation(inode);
3868         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3869
3870         /*
3871          * Free each page after tx, so the only ref left is
3872          * held by the network stack
3873          */
3874         for (; i > 0; i--)
3875                 put_page(pages[i-1]);
3876
3877         /*
3878          * Acl update can result in inode attribute update.
3879          * so mark the attribute cache invalid.
3880          */
3881         spin_lock(&inode->i_lock);
3882         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3883         spin_unlock(&inode->i_lock);
3884         nfs_access_zap_cache(inode);
3885         nfs_zap_acl_cache(inode);
3886         return ret;
3887 }
3888
3889 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3890 {
3891         struct nfs4_exception exception = { };
3892         int err;
3893         do {
3894                 err = nfs4_handle_exception(NFS_SERVER(inode),
3895                                 __nfs4_proc_set_acl(inode, buf, buflen),
3896                                 &exception);
3897         } while (exception.retry);
3898         return err;
3899 }
3900
3901 static int
3902 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3903 {
3904         struct nfs_client *clp = server->nfs_client;
3905
3906         if (task->tk_status >= 0)
3907                 return 0;
3908         switch(task->tk_status) {
3909                 case -NFS4ERR_DELEG_REVOKED:
3910                 case -NFS4ERR_ADMIN_REVOKED:
3911                 case -NFS4ERR_BAD_STATEID:
3912                         if (state == NULL)
3913                                 break;
3914                         nfs_remove_bad_delegation(state->inode);
3915                 case -NFS4ERR_OPENMODE:
3916                         if (state == NULL)
3917                                 break;
3918                         nfs4_schedule_stateid_recovery(server, state);
3919                         goto wait_on_recovery;
3920                 case -NFS4ERR_EXPIRED:
3921                         if (state != NULL)
3922                                 nfs4_schedule_stateid_recovery(server, state);
3923                 case -NFS4ERR_STALE_STATEID:
3924                 case -NFS4ERR_STALE_CLIENTID:
3925                         nfs4_schedule_lease_recovery(clp);
3926                         goto wait_on_recovery;
3927 #if defined(CONFIG_NFS_V4_1)
3928                 case -NFS4ERR_BADSESSION:
3929                 case -NFS4ERR_BADSLOT:
3930                 case -NFS4ERR_BAD_HIGH_SLOT:
3931                 case -NFS4ERR_DEADSESSION:
3932                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3933                 case -NFS4ERR_SEQ_FALSE_RETRY:
3934                 case -NFS4ERR_SEQ_MISORDERED:
3935                         dprintk("%s ERROR %d, Reset session\n", __func__,
3936                                 task->tk_status);
3937                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3938                         task->tk_status = 0;
3939                         return -EAGAIN;
3940 #endif /* CONFIG_NFS_V4_1 */
3941                 case -NFS4ERR_DELAY:
3942                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3943                 case -NFS4ERR_GRACE:
3944                 case -EKEYEXPIRED:
3945                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3946                         task->tk_status = 0;
3947                         return -EAGAIN;
3948                 case -NFS4ERR_RETRY_UNCACHED_REP:
3949                 case -NFS4ERR_OLD_STATEID:
3950                         task->tk_status = 0;
3951                         return -EAGAIN;
3952         }
3953         task->tk_status = nfs4_map_errors(task->tk_status);
3954         return 0;
3955 wait_on_recovery:
3956         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3957         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3958                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3959         task->tk_status = 0;
3960         return -EAGAIN;
3961 }
3962
3963 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3964                                     nfs4_verifier *bootverf)
3965 {
3966         __be32 verf[2];
3967
3968         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3969                 /* An impossible timestamp guarantees this value
3970                  * will never match a generated boot time. */
3971                 verf[0] = 0;
3972                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3973         } else {
3974                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3975                 verf[0] = (__be32)nn->boot_time.tv_sec;
3976                 verf[1] = (__be32)nn->boot_time.tv_nsec;
3977         }
3978         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3979 }
3980
3981 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3982                 unsigned short port, struct rpc_cred *cred,
3983                 struct nfs4_setclientid_res *res)
3984 {
3985         nfs4_verifier sc_verifier;
3986         struct nfs4_setclientid setclientid = {
3987                 .sc_verifier = &sc_verifier,
3988                 .sc_prog = program,
3989                 .sc_cb_ident = clp->cl_cb_ident,
3990         };
3991         struct rpc_message msg = {
3992                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3993                 .rpc_argp = &setclientid,
3994                 .rpc_resp = res,
3995                 .rpc_cred = cred,
3996         };
3997         int loop = 0;
3998         int status;
3999
4000         nfs4_init_boot_verifier(clp, &sc_verifier);
4001
4002         for(;;) {
4003                 rcu_read_lock();
4004                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
4005                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
4006                                 clp->cl_ipaddr,
4007                                 rpc_peeraddr2str(clp->cl_rpcclient,
4008                                                         RPC_DISPLAY_ADDR),
4009                                 rpc_peeraddr2str(clp->cl_rpcclient,
4010                                                         RPC_DISPLAY_PROTO),
4011                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4012                                 clp->cl_id_uniquifier);
4013                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4014                                 sizeof(setclientid.sc_netid),
4015                                 rpc_peeraddr2str(clp->cl_rpcclient,
4016                                                         RPC_DISPLAY_NETID));
4017                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4018                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4019                                 clp->cl_ipaddr, port >> 8, port & 255);
4020                 rcu_read_unlock();
4021
4022                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4023                 if (status != -NFS4ERR_CLID_INUSE)
4024                         break;
4025                 if (loop != 0) {
4026                         ++clp->cl_id_uniquifier;
4027                         break;
4028                 }
4029                 ++loop;
4030                 ssleep(clp->cl_lease_time / HZ + 1);
4031         }
4032         return status;
4033 }
4034
4035 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4036                 struct nfs4_setclientid_res *arg,
4037                 struct rpc_cred *cred)
4038 {
4039         struct nfs_fsinfo fsinfo;
4040         struct rpc_message msg = {
4041                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4042                 .rpc_argp = arg,
4043                 .rpc_resp = &fsinfo,
4044                 .rpc_cred = cred,
4045         };
4046         unsigned long now;
4047         int status;
4048
4049         now = jiffies;
4050         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4051         if (status == 0) {
4052                 spin_lock(&clp->cl_lock);
4053                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4054                 clp->cl_last_renewal = now;
4055                 spin_unlock(&clp->cl_lock);
4056         }
4057         return status;
4058 }
4059
4060 struct nfs4_delegreturndata {
4061         struct nfs4_delegreturnargs args;
4062         struct nfs4_delegreturnres res;
4063         struct nfs_fh fh;
4064         nfs4_stateid stateid;
4065         unsigned long timestamp;
4066         struct nfs_fattr fattr;
4067         int rpc_status;
4068 };
4069
4070 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4071 {
4072         struct nfs4_delegreturndata *data = calldata;
4073
4074         if (!nfs4_sequence_done(task, &data->res.seq_res))
4075                 return;
4076
4077         switch (task->tk_status) {
4078         case -NFS4ERR_STALE_STATEID:
4079         case -NFS4ERR_EXPIRED:
4080         case 0:
4081                 renew_lease(data->res.server, data->timestamp);
4082                 break;
4083         default:
4084                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4085                                 -EAGAIN) {
4086                         rpc_restart_call_prepare(task);
4087                         return;
4088                 }
4089         }
4090         data->rpc_status = task->tk_status;
4091 }
4092
4093 static void nfs4_delegreturn_release(void *calldata)
4094 {
4095         kfree(calldata);
4096 }
4097
4098 #if defined(CONFIG_NFS_V4_1)
4099 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4100 {
4101         struct nfs4_delegreturndata *d_data;
4102
4103         d_data = (struct nfs4_delegreturndata *)data;
4104
4105         if (nfs4_setup_sequence(d_data->res.server,
4106                                 &d_data->args.seq_args,
4107                                 &d_data->res.seq_res, task))
4108                 return;
4109         rpc_call_start(task);
4110 }
4111 #endif /* CONFIG_NFS_V4_1 */
4112
4113 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4114 #if defined(CONFIG_NFS_V4_1)
4115         .rpc_call_prepare = nfs4_delegreturn_prepare,
4116 #endif /* CONFIG_NFS_V4_1 */
4117         .rpc_call_done = nfs4_delegreturn_done,
4118         .rpc_release = nfs4_delegreturn_release,
4119 };
4120
4121 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4122 {
4123         struct nfs4_delegreturndata *data;
4124         struct nfs_server *server = NFS_SERVER(inode);
4125         struct rpc_task *task;
4126         struct rpc_message msg = {
4127                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4128                 .rpc_cred = cred,
4129         };
4130         struct rpc_task_setup task_setup_data = {
4131                 .rpc_client = server->client,
4132                 .rpc_message = &msg,
4133                 .callback_ops = &nfs4_delegreturn_ops,
4134                 .flags = RPC_TASK_ASYNC,
4135         };
4136         int status = 0;
4137
4138         data = kzalloc(sizeof(*data), GFP_NOFS);
4139         if (data == NULL)
4140                 return -ENOMEM;
4141         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4142         data->args.fhandle = &data->fh;
4143         data->args.stateid = &data->stateid;
4144         data->args.bitmask = server->cache_consistency_bitmask;
4145         nfs_copy_fh(&data->fh, NFS_FH(inode));
4146         nfs4_stateid_copy(&data->stateid, stateid);
4147         data->res.fattr = &data->fattr;
4148         data->res.server = server;
4149         nfs_fattr_init(data->res.fattr);
4150         data->timestamp = jiffies;
4151         data->rpc_status = 0;
4152
4153         task_setup_data.callback_data = data;
4154         msg.rpc_argp = &data->args;
4155         msg.rpc_resp = &data->res;
4156         task = rpc_run_task(&task_setup_data);
4157         if (IS_ERR(task))
4158                 return PTR_ERR(task);
4159         if (!issync)
4160                 goto out;
4161         status = nfs4_wait_for_completion_rpc_task(task);
4162         if (status != 0)
4163                 goto out;
4164         status = data->rpc_status;
4165         if (status == 0)
4166                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4167         else
4168                 nfs_refresh_inode(inode, &data->fattr);
4169 out:
4170         rpc_put_task(task);
4171         return status;
4172 }
4173
4174 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4175 {
4176         struct nfs_server *server = NFS_SERVER(inode);
4177         struct nfs4_exception exception = { };
4178         int err;
4179         do {
4180                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4181                 switch (err) {
4182                         case -NFS4ERR_STALE_STATEID:
4183                         case -NFS4ERR_EXPIRED:
4184                         case 0:
4185                                 return 0;
4186                 }
4187                 err = nfs4_handle_exception(server, err, &exception);
4188         } while (exception.retry);
4189         return err;
4190 }
4191
4192 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4193 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4194
4195 /*
4196  * sleep, with exponential backoff, and retry the LOCK operation.
4197  */
4198 static unsigned long
4199 nfs4_set_lock_task_retry(unsigned long timeout)
4200 {
4201         freezable_schedule_timeout_killable(timeout);
4202         timeout <<= 1;
4203         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4204                 return NFS4_LOCK_MAXTIMEOUT;
4205         return timeout;
4206 }
4207
4208 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4209 {
4210         struct inode *inode = state->inode;
4211         struct nfs_server *server = NFS_SERVER(inode);
4212         struct nfs_client *clp = server->nfs_client;
4213         struct nfs_lockt_args arg = {
4214                 .fh = NFS_FH(inode),
4215                 .fl = request,
4216         };
4217         struct nfs_lockt_res res = {
4218                 .denied = request,
4219         };
4220         struct rpc_message msg = {
4221                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4222                 .rpc_argp       = &arg,
4223                 .rpc_resp       = &res,
4224                 .rpc_cred       = state->owner->so_cred,
4225         };
4226         struct nfs4_lock_state *lsp;
4227         int status;
4228
4229         arg.lock_owner.clientid = clp->cl_clientid;
4230         status = nfs4_set_lock_state(state, request);
4231         if (status != 0)
4232                 goto out;
4233         lsp = request->fl_u.nfs4_fl.owner;
4234         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4235         arg.lock_owner.s_dev = server->s_dev;
4236         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4237         switch (status) {
4238                 case 0:
4239                         request->fl_type = F_UNLCK;
4240                         break;
4241                 case -NFS4ERR_DENIED:
4242                         status = 0;
4243         }
4244         request->fl_ops->fl_release_private(request);
4245 out:
4246         return status;
4247 }
4248
4249 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4250 {
4251         struct nfs4_exception exception = { };
4252         int err;
4253
4254         do {
4255                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4256                                 _nfs4_proc_getlk(state, cmd, request),
4257                                 &exception);
4258         } while (exception.retry);
4259         return err;
4260 }
4261
4262 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4263 {
4264         int res = 0;
4265         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4266                 case FL_POSIX:
4267                         res = posix_lock_file_wait(file, fl);
4268                         break;
4269                 case FL_FLOCK:
4270                         res = flock_lock_file_wait(file, fl);
4271                         break;
4272                 default:
4273                         BUG();
4274         }
4275         return res;
4276 }
4277
4278 struct nfs4_unlockdata {
4279         struct nfs_locku_args arg;
4280         struct nfs_locku_res res;
4281         struct nfs4_lock_state *lsp;
4282         struct nfs_open_context *ctx;
4283         struct file_lock fl;
4284         const struct nfs_server *server;
4285         unsigned long timestamp;
4286 };
4287
4288 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4289                 struct nfs_open_context *ctx,
4290                 struct nfs4_lock_state *lsp,
4291                 struct nfs_seqid *seqid)
4292 {
4293         struct nfs4_unlockdata *p;
4294         struct inode *inode = lsp->ls_state->inode;
4295
4296         p = kzalloc(sizeof(*p), GFP_NOFS);
4297         if (p == NULL)
4298                 return NULL;
4299         p->arg.fh = NFS_FH(inode);
4300         p->arg.fl = &p->fl;
4301         p->arg.seqid = seqid;
4302         p->res.seqid = seqid;
4303         p->arg.stateid = &lsp->ls_stateid;
4304         p->lsp = lsp;
4305         atomic_inc(&lsp->ls_count);
4306         /* Ensure we don't close file until we're done freeing locks! */
4307         p->ctx = get_nfs_open_context(ctx);
4308         memcpy(&p->fl, fl, sizeof(p->fl));
4309         p->server = NFS_SERVER(inode);
4310         return p;
4311 }
4312
4313 static void nfs4_locku_release_calldata(void *data)
4314 {
4315         struct nfs4_unlockdata *calldata = data;
4316         nfs_free_seqid(calldata->arg.seqid);
4317         nfs4_put_lock_state(calldata->lsp);
4318         put_nfs_open_context(calldata->ctx);
4319         kfree(calldata);
4320 }
4321
4322 static void nfs4_locku_done(struct rpc_task *task, void *data)
4323 {
4324         struct nfs4_unlockdata *calldata = data;
4325
4326         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4327                 return;
4328         switch (task->tk_status) {
4329                 case 0:
4330                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4331                                         &calldata->res.stateid);
4332                         renew_lease(calldata->server, calldata->timestamp);
4333                         break;
4334                 case -NFS4ERR_BAD_STATEID:
4335                 case -NFS4ERR_OLD_STATEID:
4336                 case -NFS4ERR_STALE_STATEID:
4337                 case -NFS4ERR_EXPIRED:
4338                         break;
4339                 default:
4340                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4341                                 rpc_restart_call_prepare(task);
4342         }
4343 }
4344
4345 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4346 {
4347         struct nfs4_unlockdata *calldata = data;
4348
4349         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4350                 return;
4351         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4352                 /* Note: exit _without_ running nfs4_locku_done */
4353                 task->tk_action = NULL;
4354                 return;
4355         }
4356         calldata->timestamp = jiffies;
4357         if (nfs4_setup_sequence(calldata->server,
4358                                 &calldata->arg.seq_args,
4359                                 &calldata->res.seq_res, task))
4360                 return;
4361         rpc_call_start(task);
4362 }
4363
4364 static const struct rpc_call_ops nfs4_locku_ops = {
4365         .rpc_call_prepare = nfs4_locku_prepare,
4366         .rpc_call_done = nfs4_locku_done,
4367         .rpc_release = nfs4_locku_release_calldata,
4368 };
4369
4370 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4371                 struct nfs_open_context *ctx,
4372                 struct nfs4_lock_state *lsp,
4373                 struct nfs_seqid *seqid)
4374 {
4375         struct nfs4_unlockdata *data;
4376         struct rpc_message msg = {
4377                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4378                 .rpc_cred = ctx->cred,
4379         };
4380         struct rpc_task_setup task_setup_data = {
4381                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4382                 .rpc_message = &msg,
4383                 .callback_ops = &nfs4_locku_ops,
4384                 .workqueue = nfsiod_workqueue,
4385                 .flags = RPC_TASK_ASYNC,
4386         };
4387
4388         /* Ensure this is an unlock - when canceling a lock, the
4389          * canceled lock is passed in, and it won't be an unlock.
4390          */
4391         fl->fl_type = F_UNLCK;
4392
4393         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4394         if (data == NULL) {
4395                 nfs_free_seqid(seqid);
4396                 return ERR_PTR(-ENOMEM);
4397         }
4398
4399         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4400         msg.rpc_argp = &data->arg;
4401         msg.rpc_resp = &data->res;
4402         task_setup_data.callback_data = data;
4403         return rpc_run_task(&task_setup_data);
4404 }
4405
4406 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4407 {
4408         struct nfs_inode *nfsi = NFS_I(state->inode);
4409         struct nfs_seqid *seqid;
4410         struct nfs4_lock_state *lsp;
4411         struct rpc_task *task;
4412         int status = 0;
4413         unsigned char fl_flags = request->fl_flags;
4414
4415         status = nfs4_set_lock_state(state, request);
4416         /* Unlock _before_ we do the RPC call */
4417         request->fl_flags |= FL_EXISTS;
4418         down_read(&nfsi->rwsem);
4419         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4420                 up_read(&nfsi->rwsem);
4421                 goto out;
4422         }
4423         up_read(&nfsi->rwsem);
4424         if (status != 0)
4425                 goto out;
4426         /* Is this a delegated lock? */
4427         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4428                 goto out;
4429         lsp = request->fl_u.nfs4_fl.owner;
4430         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4431         status = -ENOMEM;
4432         if (seqid == NULL)
4433                 goto out;
4434         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4435         status = PTR_ERR(task);
4436         if (IS_ERR(task))
4437                 goto out;
4438         status = nfs4_wait_for_completion_rpc_task(task);
4439         rpc_put_task(task);
4440 out:
4441         request->fl_flags = fl_flags;
4442         return status;
4443 }
4444
4445 struct nfs4_lockdata {
4446         struct nfs_lock_args arg;
4447         struct nfs_lock_res res;
4448         struct nfs4_lock_state *lsp;
4449         struct nfs_open_context *ctx;
4450         struct file_lock fl;
4451         unsigned long timestamp;
4452         int rpc_status;
4453         int cancelled;
4454         struct nfs_server *server;
4455 };
4456
4457 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4458                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4459                 gfp_t gfp_mask)
4460 {
4461         struct nfs4_lockdata *p;
4462         struct inode *inode = lsp->ls_state->inode;
4463         struct nfs_server *server = NFS_SERVER(inode);
4464
4465         p = kzalloc(sizeof(*p), gfp_mask);
4466         if (p == NULL)
4467                 return NULL;
4468
4469         p->arg.fh = NFS_FH(inode);
4470         p->arg.fl = &p->fl;
4471         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4472         if (p->arg.open_seqid == NULL)
4473                 goto out_free;
4474         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4475         if (p->arg.lock_seqid == NULL)
4476                 goto out_free_seqid;
4477         p->arg.lock_stateid = &lsp->ls_stateid;
4478         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4479         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4480         p->arg.lock_owner.s_dev = server->s_dev;
4481         p->res.lock_seqid = p->arg.lock_seqid;
4482         p->lsp = lsp;
4483         p->server = server;
4484         atomic_inc(&lsp->ls_count);
4485         p->ctx = get_nfs_open_context(ctx);
4486         memcpy(&p->fl, fl, sizeof(p->fl));
4487         return p;
4488 out_free_seqid:
4489         nfs_free_seqid(p->arg.open_seqid);
4490 out_free:
4491         kfree(p);
4492         return NULL;
4493 }
4494
4495 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4496 {
4497         struct nfs4_lockdata *data = calldata;
4498         struct nfs4_state *state = data->lsp->ls_state;
4499
4500         dprintk("%s: begin!\n", __func__);
4501         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4502                 return;
4503         /* Do we need to do an open_to_lock_owner? */
4504         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4505                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4506                         return;
4507                 data->arg.open_stateid = &state->stateid;
4508                 data->arg.new_lock_owner = 1;
4509                 data->res.open_seqid = data->arg.open_seqid;
4510         } else
4511                 data->arg.new_lock_owner = 0;
4512         data->timestamp = jiffies;
4513         if (nfs4_setup_sequence(data->server,
4514                                 &data->arg.seq_args,
4515                                 &data->res.seq_res, task))
4516                 return;
4517         rpc_call_start(task);
4518         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4519 }
4520
4521 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4522 {
4523         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4524         nfs4_lock_prepare(task, calldata);
4525 }
4526
4527 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4528 {
4529         struct nfs4_lockdata *data = calldata;
4530
4531         dprintk("%s: begin!\n", __func__);
4532
4533         if (!nfs4_sequence_done(task, &data->res.seq_res))
4534                 return;
4535
4536         data->rpc_status = task->tk_status;
4537         if (data->arg.new_lock_owner != 0) {
4538                 if (data->rpc_status == 0)
4539                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4540                 else
4541                         goto out;
4542         }
4543         if (data->rpc_status == 0) {
4544                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4545                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4546                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4547         }
4548 out:
4549         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4550 }
4551
4552 static void nfs4_lock_release(void *calldata)
4553 {
4554         struct nfs4_lockdata *data = calldata;
4555
4556         dprintk("%s: begin!\n", __func__);
4557         nfs_free_seqid(data->arg.open_seqid);
4558         if (data->cancelled != 0) {
4559                 struct rpc_task *task;
4560                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4561                                 data->arg.lock_seqid);
4562                 if (!IS_ERR(task))
4563                         rpc_put_task_async(task);
4564                 dprintk("%s: cancelling lock!\n", __func__);
4565         } else
4566                 nfs_free_seqid(data->arg.lock_seqid);
4567         nfs4_put_lock_state(data->lsp);
4568         put_nfs_open_context(data->ctx);
4569         kfree(data);
4570         dprintk("%s: done!\n", __func__);
4571 }
4572
4573 static const struct rpc_call_ops nfs4_lock_ops = {
4574         .rpc_call_prepare = nfs4_lock_prepare,
4575         .rpc_call_done = nfs4_lock_done,
4576         .rpc_release = nfs4_lock_release,
4577 };
4578
4579 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4580         .rpc_call_prepare = nfs4_recover_lock_prepare,
4581         .rpc_call_done = nfs4_lock_done,
4582         .rpc_release = nfs4_lock_release,
4583 };
4584
4585 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4586 {
4587         switch (error) {
4588         case -NFS4ERR_ADMIN_REVOKED:
4589         case -NFS4ERR_BAD_STATEID:
4590                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4591                 if (new_lock_owner != 0 ||
4592                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4593                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4594                 break;
4595         case -NFS4ERR_STALE_STATEID:
4596                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4597         case -NFS4ERR_EXPIRED:
4598                 nfs4_schedule_lease_recovery(server->nfs_client);
4599         };
4600 }
4601
4602 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4603 {
4604         struct nfs4_lockdata *data;
4605         struct rpc_task *task;
4606         struct rpc_message msg = {
4607                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4608                 .rpc_cred = state->owner->so_cred,
4609         };
4610         struct rpc_task_setup task_setup_data = {
4611                 .rpc_client = NFS_CLIENT(state->inode),
4612                 .rpc_message = &msg,
4613                 .callback_ops = &nfs4_lock_ops,
4614                 .workqueue = nfsiod_workqueue,
4615                 .flags = RPC_TASK_ASYNC,
4616         };
4617         int ret;
4618
4619         dprintk("%s: begin!\n", __func__);
4620         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4621                         fl->fl_u.nfs4_fl.owner,
4622                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4623         if (data == NULL)
4624                 return -ENOMEM;
4625         if (IS_SETLKW(cmd))
4626                 data->arg.block = 1;
4627         if (recovery_type > NFS_LOCK_NEW) {
4628                 if (recovery_type == NFS_LOCK_RECLAIM)
4629                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4630                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4631         }
4632         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4633         msg.rpc_argp = &data->arg;
4634         msg.rpc_resp = &data->res;
4635         task_setup_data.callback_data = data;
4636         task = rpc_run_task(&task_setup_data);
4637         if (IS_ERR(task))
4638                 return PTR_ERR(task);
4639         ret = nfs4_wait_for_completion_rpc_task(task);
4640         if (ret == 0) {
4641                 ret = data->rpc_status;
4642                 if (ret)
4643                         nfs4_handle_setlk_error(data->server, data->lsp,
4644                                         data->arg.new_lock_owner, ret);
4645         } else
4646                 data->cancelled = 1;
4647         rpc_put_task(task);
4648         dprintk("%s: done, ret = %d!\n", __func__, ret);
4649         return ret;
4650 }
4651
4652 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4653 {
4654         struct nfs_server *server = NFS_SERVER(state->inode);
4655         struct nfs4_exception exception = {
4656                 .inode = state->inode,
4657         };
4658         int err;
4659
4660         do {
4661                 /* Cache the lock if possible... */
4662                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4663                         return 0;
4664                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4665                 if (err != -NFS4ERR_DELAY)
4666                         break;
4667                 nfs4_handle_exception(server, err, &exception);
4668         } while (exception.retry);
4669         return err;
4670 }
4671
4672 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4673 {
4674         struct nfs_server *server = NFS_SERVER(state->inode);
4675         struct nfs4_exception exception = {
4676                 .inode = state->inode,
4677         };
4678         int err;
4679
4680         err = nfs4_set_lock_state(state, request);
4681         if (err != 0)
4682                 return err;
4683         do {
4684                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4685                         return 0;
4686                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4687                 switch (err) {
4688                 default:
4689                         goto out;
4690                 case -NFS4ERR_GRACE:
4691                 case -NFS4ERR_DELAY:
4692                         nfs4_handle_exception(server, err, &exception);
4693                         err = 0;
4694                 }
4695         } while (exception.retry);
4696 out:
4697         return err;
4698 }
4699
4700 #if defined(CONFIG_NFS_V4_1)
4701 static int nfs41_check_expired_locks(struct nfs4_state *state)
4702 {
4703         int status, ret = NFS_OK;
4704         struct nfs4_lock_state *lsp;
4705         struct nfs_server *server = NFS_SERVER(state->inode);
4706
4707         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4708                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4709                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4710                         if (status != NFS_OK) {
4711                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4712                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4713                                 ret = status;
4714                         }
4715                 }
4716         };
4717
4718         return ret;
4719 }
4720
4721 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4722 {
4723         int status = NFS_OK;
4724
4725         if (test_bit(LK_STATE_IN_USE, &state->flags))
4726                 status = nfs41_check_expired_locks(state);
4727         if (status == NFS_OK)
4728                 return status;
4729         return nfs4_lock_expired(state, request);
4730 }
4731 #endif
4732
4733 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4734 {
4735         struct nfs_inode *nfsi = NFS_I(state->inode);
4736         unsigned char fl_flags = request->fl_flags;
4737         int status = -ENOLCK;
4738
4739         if ((fl_flags & FL_POSIX) &&
4740                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4741                 goto out;
4742         /* Is this a delegated open? */
4743         status = nfs4_set_lock_state(state, request);
4744         if (status != 0)
4745                 goto out;
4746         request->fl_flags |= FL_ACCESS;
4747         status = do_vfs_lock(request->fl_file, request);
4748         if (status < 0)
4749                 goto out;
4750         down_read(&nfsi->rwsem);
4751         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4752                 /* Yes: cache locks! */
4753                 /* ...but avoid races with delegation recall... */
4754                 request->fl_flags = fl_flags & ~FL_SLEEP;
4755                 status = do_vfs_lock(request->fl_file, request);
4756                 goto out_unlock;
4757         }
4758         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4759         if (status != 0)
4760                 goto out_unlock;
4761         /* Note: we always want to sleep here! */
4762         request->fl_flags = fl_flags | FL_SLEEP;
4763         if (do_vfs_lock(request->fl_file, request) < 0)
4764                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4765                         "manager!\n", __func__);
4766 out_unlock:
4767         up_read(&nfsi->rwsem);
4768 out:
4769         request->fl_flags = fl_flags;
4770         return status;
4771 }
4772
4773 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4774 {
4775         struct nfs4_exception exception = {
4776                 .state = state,
4777                 .inode = state->inode,
4778         };
4779         int err;
4780
4781         do {
4782                 err = _nfs4_proc_setlk(state, cmd, request);
4783                 if (err == -NFS4ERR_DENIED)
4784                         err = -EAGAIN;
4785                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4786                                 err, &exception);
4787         } while (exception.retry);
4788         return err;
4789 }
4790
4791 static int
4792 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4793 {
4794         struct nfs_open_context *ctx;
4795         struct nfs4_state *state;
4796         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4797         int status;
4798
4799         /* verify open state */
4800         ctx = nfs_file_open_context(filp);
4801         state = ctx->state;
4802
4803         if (request->fl_start < 0 || request->fl_end < 0)
4804                 return -EINVAL;
4805
4806         if (IS_GETLK(cmd)) {
4807                 if (state != NULL)
4808                         return nfs4_proc_getlk(state, F_GETLK, request);
4809                 return 0;
4810         }
4811
4812         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4813                 return -EINVAL;
4814
4815         if (request->fl_type == F_UNLCK) {
4816                 if (state != NULL)
4817                         return nfs4_proc_unlck(state, cmd, request);
4818                 return 0;
4819         }
4820
4821         if (state == NULL)
4822                 return -ENOLCK;
4823         /*
4824          * Don't rely on the VFS having checked the file open mode,
4825          * since it won't do this for flock() locks.
4826          */
4827         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4828         case F_RDLCK:
4829                 if (!(filp->f_mode & FMODE_READ))
4830                         return -EBADF;
4831                 break;
4832         case F_WRLCK:
4833                 if (!(filp->f_mode & FMODE_WRITE))
4834                         return -EBADF;
4835         }
4836
4837         do {
4838                 status = nfs4_proc_setlk(state, cmd, request);
4839                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4840                         break;
4841                 timeout = nfs4_set_lock_task_retry(timeout);
4842                 status = -ERESTARTSYS;
4843                 if (signalled())
4844                         break;
4845         } while(status < 0);
4846         return status;
4847 }
4848
4849 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4850 {
4851         struct nfs_server *server = NFS_SERVER(state->inode);
4852         struct nfs4_exception exception = { };
4853         int err;
4854
4855         err = nfs4_set_lock_state(state, fl);
4856         if (err != 0)
4857                 goto out;
4858         do {
4859                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4860                 switch (err) {
4861                         default:
4862                                 printk(KERN_ERR "NFS: %s: unhandled error "
4863                                         "%d.\n", __func__, err);
4864                         case 0:
4865                         case -ESTALE:
4866                                 goto out;
4867                         case -NFS4ERR_EXPIRED:
4868                                 nfs4_schedule_stateid_recovery(server, state);
4869                         case -NFS4ERR_STALE_CLIENTID:
4870                         case -NFS4ERR_STALE_STATEID:
4871                                 nfs4_schedule_lease_recovery(server->nfs_client);
4872                                 goto out;
4873                         case -NFS4ERR_BADSESSION:
4874                         case -NFS4ERR_BADSLOT:
4875                         case -NFS4ERR_BAD_HIGH_SLOT:
4876                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4877                         case -NFS4ERR_DEADSESSION:
4878                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4879                                 goto out;
4880                         case -ERESTARTSYS:
4881                                 /*
4882                                  * The show must go on: exit, but mark the
4883                                  * stateid as needing recovery.
4884                                  */
4885                         case -NFS4ERR_DELEG_REVOKED:
4886                         case -NFS4ERR_ADMIN_REVOKED:
4887                         case -NFS4ERR_BAD_STATEID:
4888                         case -NFS4ERR_OPENMODE:
4889                                 nfs4_schedule_stateid_recovery(server, state);
4890                                 err = 0;
4891                                 goto out;
4892                         case -EKEYEXPIRED:
4893                                 /*
4894                                  * User RPCSEC_GSS context has expired.
4895                                  * We cannot recover this stateid now, so
4896                                  * skip it and allow recovery thread to
4897                                  * proceed.
4898                                  */
4899                                 err = 0;
4900                                 goto out;
4901                         case -ENOMEM:
4902                         case -NFS4ERR_DENIED:
4903                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4904                                 err = 0;
4905                                 goto out;
4906                         case -NFS4ERR_DELAY:
4907                                 break;
4908                 }
4909                 err = nfs4_handle_exception(server, err, &exception);
4910         } while (exception.retry);
4911 out:
4912         return err;
4913 }
4914
4915 struct nfs_release_lockowner_data {
4916         struct nfs4_lock_state *lsp;
4917         struct nfs_server *server;
4918         struct nfs_release_lockowner_args args;
4919 };
4920
4921 static void nfs4_release_lockowner_release(void *calldata)
4922 {
4923         struct nfs_release_lockowner_data *data = calldata;
4924         nfs4_free_lock_state(data->server, data->lsp);
4925         kfree(calldata);
4926 }
4927
4928 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4929         .rpc_release = nfs4_release_lockowner_release,
4930 };
4931
4932 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4933 {
4934         struct nfs_server *server = lsp->ls_state->owner->so_server;
4935         struct nfs_release_lockowner_data *data;
4936         struct rpc_message msg = {
4937                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4938         };
4939
4940         if (server->nfs_client->cl_mvops->minor_version != 0)
4941                 return -EINVAL;
4942         data = kmalloc(sizeof(*data), GFP_NOFS);
4943         if (!data)
4944                 return -ENOMEM;
4945         data->lsp = lsp;
4946         data->server = server;
4947         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4948         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4949         data->args.lock_owner.s_dev = server->s_dev;
4950         msg.rpc_argp = &data->args;
4951         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4952         return 0;
4953 }
4954
4955 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4956
4957 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4958                                    const void *buf, size_t buflen,
4959                                    int flags, int type)
4960 {
4961         if (strcmp(key, "") != 0)
4962                 return -EINVAL;
4963
4964         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4965 }
4966
4967 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4968                                    void *buf, size_t buflen, int type)
4969 {
4970         if (strcmp(key, "") != 0)
4971                 return -EINVAL;
4972
4973         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4974 }
4975
4976 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4977                                        size_t list_len, const char *name,
4978                                        size_t name_len, int type)
4979 {
4980         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4981
4982         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4983                 return 0;
4984
4985         if (list && len <= list_len)
4986                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4987         return len;
4988 }
4989
4990 /*
4991  * nfs_fhget will use either the mounted_on_fileid or the fileid
4992  */
4993 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4994 {
4995         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4996                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4997               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4998               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4999                 return;
5000
5001         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5002                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5003         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5004         fattr->nlink = 2;
5005 }
5006
5007 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5008                                    const struct qstr *name,
5009                                    struct nfs4_fs_locations *fs_locations,
5010                                    struct page *page)
5011 {
5012         struct nfs_server *server = NFS_SERVER(dir);
5013         u32 bitmask[2] = {
5014                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5015         };
5016         struct nfs4_fs_locations_arg args = {
5017                 .dir_fh = NFS_FH(dir),
5018                 .name = name,
5019                 .page = page,
5020                 .bitmask = bitmask,
5021         };
5022         struct nfs4_fs_locations_res res = {
5023                 .fs_locations = fs_locations,
5024         };
5025         struct rpc_message msg = {
5026                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5027                 .rpc_argp = &args,
5028                 .rpc_resp = &res,
5029         };
5030         int status;
5031
5032         dprintk("%s: start\n", __func__);
5033
5034         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5035          * is not supported */
5036         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5037                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5038         else
5039                 bitmask[0] |= FATTR4_WORD0_FILEID;
5040
5041         nfs_fattr_init(&fs_locations->fattr);
5042         fs_locations->server = server;
5043         fs_locations->nlocations = 0;
5044         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5045         dprintk("%s: returned status = %d\n", __func__, status);
5046         return status;
5047 }
5048
5049 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5050                            const struct qstr *name,
5051                            struct nfs4_fs_locations *fs_locations,
5052                            struct page *page)
5053 {
5054         struct nfs4_exception exception = { };
5055         int err;
5056         do {
5057                 err = nfs4_handle_exception(NFS_SERVER(dir),
5058                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5059                                 &exception);
5060         } while (exception.retry);
5061         return err;
5062 }
5063
5064 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5065 {
5066         int status;
5067         struct nfs4_secinfo_arg args = {
5068                 .dir_fh = NFS_FH(dir),
5069                 .name   = name,
5070         };
5071         struct nfs4_secinfo_res res = {
5072                 .flavors     = flavors,
5073         };
5074         struct rpc_message msg = {
5075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5076                 .rpc_argp = &args,
5077                 .rpc_resp = &res,
5078         };
5079
5080         dprintk("NFS call  secinfo %s\n", name->name);
5081         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5082         dprintk("NFS reply  secinfo: %d\n", status);
5083         return status;
5084 }
5085
5086 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5087                       struct nfs4_secinfo_flavors *flavors)
5088 {
5089         struct nfs4_exception exception = { };
5090         int err;
5091         do {
5092                 err = nfs4_handle_exception(NFS_SERVER(dir),
5093                                 _nfs4_proc_secinfo(dir, name, flavors),
5094                                 &exception);
5095         } while (exception.retry);
5096         return err;
5097 }
5098
5099 #ifdef CONFIG_NFS_V4_1
5100 /*
5101  * Check the exchange flags returned by the server for invalid flags, having
5102  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5103  * DS flags set.
5104  */
5105 static int nfs4_check_cl_exchange_flags(u32 flags)
5106 {
5107         if (flags & ~EXCHGID4_FLAG_MASK_R)
5108                 goto out_inval;
5109         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5110             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5111                 goto out_inval;
5112         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5113                 goto out_inval;
5114         return NFS_OK;
5115 out_inval:
5116         return -NFS4ERR_INVAL;
5117 }
5118
5119 static bool
5120 nfs41_same_server_scope(struct nfs41_server_scope *a,
5121                         struct nfs41_server_scope *b)
5122 {
5123         if (a->server_scope_sz == b->server_scope_sz &&
5124             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5125                 return true;
5126
5127         return false;
5128 }
5129
5130 /*
5131  * nfs4_proc_bind_conn_to_session()
5132  *
5133  * The 4.1 client currently uses the same TCP connection for the
5134  * fore and backchannel.
5135  */
5136 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5137 {
5138         int status;
5139         struct nfs41_bind_conn_to_session_res res;
5140         struct rpc_message msg = {
5141                 .rpc_proc =
5142                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5143                 .rpc_argp = clp,
5144                 .rpc_resp = &res,
5145                 .rpc_cred = cred,
5146         };
5147
5148         dprintk("--> %s\n", __func__);
5149         BUG_ON(clp == NULL);
5150
5151         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5152         if (unlikely(res.session == NULL)) {
5153                 status = -ENOMEM;
5154                 goto out;
5155         }
5156
5157         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5158         if (status == 0) {
5159                 if (memcmp(res.session->sess_id.data,
5160                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5161                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5162                         status = -EIO;
5163                         goto out_session;
5164                 }
5165                 if (res.dir != NFS4_CDFS4_BOTH) {
5166                         dprintk("NFS: %s: Unexpected direction from server\n",
5167                                 __func__);
5168                         status = -EIO;
5169                         goto out_session;
5170                 }
5171                 if (res.use_conn_in_rdma_mode) {
5172                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5173                                 __func__);
5174                         status = -EIO;
5175                         goto out_session;
5176                 }
5177         }
5178 out_session:
5179         kfree(res.session);
5180 out:
5181         dprintk("<-- %s status= %d\n", __func__, status);
5182         return status;
5183 }
5184
5185 /*
5186  * nfs4_proc_exchange_id()
5187  *
5188  * Since the clientid has expired, all compounds using sessions
5189  * associated with the stale clientid will be returning
5190  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5191  * be in some phase of session reset.
5192  */
5193 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5194 {
5195         nfs4_verifier verifier;
5196         struct nfs41_exchange_id_args args = {
5197                 .verifier = &verifier,
5198                 .client = clp,
5199                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5200         };
5201         struct nfs41_exchange_id_res res = {
5202                 0
5203         };
5204         int status;
5205         struct rpc_message msg = {
5206                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5207                 .rpc_argp = &args,
5208                 .rpc_resp = &res,
5209                 .rpc_cred = cred,
5210         };
5211
5212         dprintk("--> %s\n", __func__);
5213         BUG_ON(clp == NULL);
5214
5215         nfs4_init_boot_verifier(clp, &verifier);
5216
5217         args.id_len = scnprintf(args.id, sizeof(args.id),
5218                                 "%s/%s/%u",
5219                                 clp->cl_ipaddr,
5220                                 clp->cl_rpcclient->cl_nodename,
5221                                 clp->cl_rpcclient->cl_auth->au_flavor);
5222
5223         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5224                                         GFP_NOFS);
5225         if (unlikely(res.server_owner == NULL)) {
5226                 status = -ENOMEM;
5227                 goto out;
5228         }
5229
5230         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5231                                         GFP_NOFS);
5232         if (unlikely(res.server_scope == NULL)) {
5233                 status = -ENOMEM;
5234                 goto out_server_owner;
5235         }
5236
5237         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5238         if (unlikely(res.impl_id == NULL)) {
5239                 status = -ENOMEM;
5240                 goto out_server_scope;
5241         }
5242
5243         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5244         if (status == 0)
5245                 status = nfs4_check_cl_exchange_flags(res.flags);
5246
5247         if (status == 0) {
5248                 clp->cl_clientid = res.clientid;
5249                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5250                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5251                         clp->cl_seqid = res.seqid;
5252
5253                 kfree(clp->cl_serverowner);
5254                 clp->cl_serverowner = res.server_owner;
5255                 res.server_owner = NULL;
5256
5257                 /* use the most recent implementation id */
5258                 kfree(clp->cl_implid);
5259                 clp->cl_implid = res.impl_id;
5260
5261                 if (clp->cl_serverscope != NULL &&
5262                     !nfs41_same_server_scope(clp->cl_serverscope,
5263                                              res.server_scope)) {
5264                         dprintk("%s: server_scope mismatch detected\n",
5265                                 __func__);
5266                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5267                         kfree(clp->cl_serverscope);
5268                         clp->cl_serverscope = NULL;
5269                 }
5270
5271                 if (clp->cl_serverscope == NULL) {
5272                         clp->cl_serverscope = res.server_scope;
5273                         goto out;
5274                 }
5275         } else
5276                 kfree(res.impl_id);
5277
5278 out_server_owner:
5279         kfree(res.server_owner);
5280 out_server_scope:
5281         kfree(res.server_scope);
5282 out:
5283         if (clp->cl_implid != NULL)
5284                 dprintk("%s: Server Implementation ID: "
5285                         "domain: %s, name: %s, date: %llu,%u\n",
5286                         __func__, clp->cl_implid->domain, clp->cl_implid->name,
5287                         clp->cl_implid->date.seconds,
5288                         clp->cl_implid->date.nseconds);
5289         dprintk("<-- %s status= %d\n", __func__, status);
5290         return status;
5291 }
5292
5293 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5294                 struct rpc_cred *cred)
5295 {
5296         struct rpc_message msg = {
5297                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5298                 .rpc_argp = clp,
5299                 .rpc_cred = cred,
5300         };
5301         int status;
5302
5303         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5304         if (status)
5305                 dprintk("NFS: Got error %d from the server %s on "
5306                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5307         return status;
5308 }
5309
5310 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5311                 struct rpc_cred *cred)
5312 {
5313         unsigned int loop;
5314         int ret;
5315
5316         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5317                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5318                 switch (ret) {
5319                 case -NFS4ERR_DELAY:
5320                 case -NFS4ERR_CLIENTID_BUSY:
5321                         ssleep(1);
5322                         break;
5323                 default:
5324                         return ret;
5325                 }
5326         }
5327         return 0;
5328 }
5329
5330 int nfs4_destroy_clientid(struct nfs_client *clp)
5331 {
5332         struct rpc_cred *cred;
5333         int ret = 0;
5334
5335         if (clp->cl_mvops->minor_version < 1)
5336                 goto out;
5337         if (clp->cl_exchange_flags == 0)
5338                 goto out;
5339         cred = nfs4_get_exchange_id_cred(clp);
5340         ret = nfs4_proc_destroy_clientid(clp, cred);
5341         if (cred)
5342                 put_rpccred(cred);
5343         switch (ret) {
5344         case 0:
5345         case -NFS4ERR_STALE_CLIENTID:
5346                 clp->cl_exchange_flags = 0;
5347         }
5348 out:
5349         return ret;
5350 }
5351
5352 struct nfs4_get_lease_time_data {
5353         struct nfs4_get_lease_time_args *args;
5354         struct nfs4_get_lease_time_res *res;
5355         struct nfs_client *clp;
5356 };
5357
5358 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5359                                         void *calldata)
5360 {
5361         int ret;
5362         struct nfs4_get_lease_time_data *data =
5363                         (struct nfs4_get_lease_time_data *)calldata;
5364
5365         dprintk("--> %s\n", __func__);
5366         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5367         /* just setup sequence, do not trigger session recovery
5368            since we're invoked within one */
5369         ret = nfs41_setup_sequence(data->clp->cl_session,
5370                                    &data->args->la_seq_args,
5371                                    &data->res->lr_seq_res, task);
5372
5373         BUG_ON(ret == -EAGAIN);
5374         rpc_call_start(task);
5375         dprintk("<-- %s\n", __func__);
5376 }
5377
5378 /*
5379  * Called from nfs4_state_manager thread for session setup, so don't recover
5380  * from sequence operation or clientid errors.
5381  */
5382 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5383 {
5384         struct nfs4_get_lease_time_data *data =
5385                         (struct nfs4_get_lease_time_data *)calldata;
5386
5387         dprintk("--> %s\n", __func__);
5388         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5389                 return;
5390         switch (task->tk_status) {
5391         case -NFS4ERR_DELAY:
5392         case -NFS4ERR_GRACE:
5393                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5394                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5395                 task->tk_status = 0;
5396                 /* fall through */
5397         case -NFS4ERR_RETRY_UNCACHED_REP:
5398                 rpc_restart_call_prepare(task);
5399                 return;
5400         }
5401         dprintk("<-- %s\n", __func__);
5402 }
5403
5404 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5405         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5406         .rpc_call_done = nfs4_get_lease_time_done,
5407 };
5408
5409 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5410 {
5411         struct rpc_task *task;
5412         struct nfs4_get_lease_time_args args;
5413         struct nfs4_get_lease_time_res res = {
5414                 .lr_fsinfo = fsinfo,
5415         };
5416         struct nfs4_get_lease_time_data data = {
5417                 .args = &args,
5418                 .res = &res,
5419                 .clp = clp,
5420         };
5421         struct rpc_message msg = {
5422                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5423                 .rpc_argp = &args,
5424                 .rpc_resp = &res,
5425         };
5426         struct rpc_task_setup task_setup = {
5427                 .rpc_client = clp->cl_rpcclient,
5428                 .rpc_message = &msg,
5429                 .callback_ops = &nfs4_get_lease_time_ops,
5430                 .callback_data = &data,
5431                 .flags = RPC_TASK_TIMEOUT,
5432         };
5433         int status;
5434
5435         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5436         dprintk("--> %s\n", __func__);
5437         task = rpc_run_task(&task_setup);
5438
5439         if (IS_ERR(task))
5440                 status = PTR_ERR(task);
5441         else {
5442                 status = task->tk_status;
5443                 rpc_put_task(task);
5444         }
5445         dprintk("<-- %s return %d\n", __func__, status);
5446
5447         return status;
5448 }
5449
5450 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5451 {
5452         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5453 }
5454
5455 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5456                 struct nfs4_slot *new,
5457                 u32 max_slots,
5458                 u32 ivalue)
5459 {
5460         struct nfs4_slot *old = NULL;
5461         u32 i;
5462
5463         spin_lock(&tbl->slot_tbl_lock);
5464         if (new) {
5465                 old = tbl->slots;
5466                 tbl->slots = new;
5467                 tbl->max_slots = max_slots;
5468         }
5469         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5470         for (i = 0; i < tbl->max_slots; i++)
5471                 tbl->slots[i].seq_nr = ivalue;
5472         spin_unlock(&tbl->slot_tbl_lock);
5473         kfree(old);
5474 }
5475
5476 /*
5477  * (re)Initialise a slot table
5478  */
5479 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5480                                  u32 ivalue)
5481 {
5482         struct nfs4_slot *new = NULL;
5483         int ret = -ENOMEM;
5484
5485         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5486                 max_reqs, tbl->max_slots);
5487
5488         /* Does the newly negotiated max_reqs match the existing slot table? */
5489         if (max_reqs != tbl->max_slots) {
5490                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5491                 if (!new)
5492                         goto out;
5493         }
5494         ret = 0;
5495
5496         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5497         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5498                 tbl, tbl->slots, tbl->max_slots);
5499 out:
5500         dprintk("<-- %s: return %d\n", __func__, ret);
5501         return ret;
5502 }
5503
5504 /* Destroy the slot table */
5505 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5506 {
5507         if (session->fc_slot_table.slots != NULL) {
5508                 kfree(session->fc_slot_table.slots);
5509                 session->fc_slot_table.slots = NULL;
5510         }
5511         if (session->bc_slot_table.slots != NULL) {
5512                 kfree(session->bc_slot_table.slots);
5513                 session->bc_slot_table.slots = NULL;
5514         }
5515         return;
5516 }
5517
5518 /*
5519  * Initialize or reset the forechannel and backchannel tables
5520  */
5521 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5522 {
5523         struct nfs4_slot_table *tbl;
5524         int status;
5525
5526         dprintk("--> %s\n", __func__);
5527         /* Fore channel */
5528         tbl = &ses->fc_slot_table;
5529         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5530         if (status) /* -ENOMEM */
5531                 return status;
5532         /* Back channel */
5533         tbl = &ses->bc_slot_table;
5534         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5535         if (status && tbl->slots == NULL)
5536                 /* Fore and back channel share a connection so get
5537                  * both slot tables or neither */
5538                 nfs4_destroy_slot_tables(ses);
5539         return status;
5540 }
5541
5542 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5543 {
5544         struct nfs4_session *session;
5545         struct nfs4_slot_table *tbl;
5546
5547         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5548         if (!session)
5549                 return NULL;
5550
5551         tbl = &session->fc_slot_table;
5552         tbl->highest_used_slotid = NFS4_NO_SLOT;
5553         spin_lock_init(&tbl->slot_tbl_lock);
5554         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5555         init_completion(&tbl->complete);
5556
5557         tbl = &session->bc_slot_table;
5558         tbl->highest_used_slotid = NFS4_NO_SLOT;
5559         spin_lock_init(&tbl->slot_tbl_lock);
5560         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5561         init_completion(&tbl->complete);
5562
5563         session->session_state = 1<<NFS4_SESSION_INITING;
5564
5565         session->clp = clp;
5566         return session;
5567 }
5568
5569 void nfs4_destroy_session(struct nfs4_session *session)
5570 {
5571         struct rpc_xprt *xprt;
5572         struct rpc_cred *cred;
5573
5574         cred = nfs4_get_exchange_id_cred(session->clp);
5575         nfs4_proc_destroy_session(session, cred);
5576         if (cred)
5577                 put_rpccred(cred);
5578
5579         rcu_read_lock();
5580         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5581         rcu_read_unlock();
5582         dprintk("%s Destroy backchannel for xprt %p\n",
5583                 __func__, xprt);
5584         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5585         nfs4_destroy_slot_tables(session);
5586         kfree(session);
5587 }
5588
5589 /*
5590  * Initialize the values to be used by the client in CREATE_SESSION
5591  * If nfs4_init_session set the fore channel request and response sizes,
5592  * use them.
5593  *
5594  * Set the back channel max_resp_sz_cached to zero to force the client to
5595  * always set csa_cachethis to FALSE because the current implementation
5596  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5597  */
5598 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5599 {
5600         struct nfs4_session *session = args->client->cl_session;
5601         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5602                      mxresp_sz = session->fc_attrs.max_resp_sz;
5603
5604         if (mxrqst_sz == 0)
5605                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5606         if (mxresp_sz == 0)
5607                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5608         /* Fore channel attributes */
5609         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5610         args->fc_attrs.max_resp_sz = mxresp_sz;
5611         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5612         args->fc_attrs.max_reqs = max_session_slots;
5613
5614         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5615                 "max_ops=%u max_reqs=%u\n",
5616                 __func__,
5617                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5618                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5619
5620         /* Back channel attributes */
5621         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5622         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5623         args->bc_attrs.max_resp_sz_cached = 0;
5624         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5625         args->bc_attrs.max_reqs = 1;
5626
5627         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5628                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5629                 __func__,
5630                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5631                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5632                 args->bc_attrs.max_reqs);
5633 }
5634
5635 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5636 {
5637         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5638         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5639
5640         if (rcvd->max_resp_sz > sent->max_resp_sz)
5641                 return -EINVAL;
5642         /*
5643          * Our requested max_ops is the minimum we need; we're not
5644          * prepared to break up compounds into smaller pieces than that.
5645          * So, no point even trying to continue if the server won't
5646          * cooperate:
5647          */
5648         if (rcvd->max_ops < sent->max_ops)
5649                 return -EINVAL;
5650         if (rcvd->max_reqs == 0)
5651                 return -EINVAL;
5652         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5653                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5654         return 0;
5655 }
5656
5657 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5658 {
5659         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5660         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5661
5662         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5663                 return -EINVAL;
5664         if (rcvd->max_resp_sz < sent->max_resp_sz)
5665                 return -EINVAL;
5666         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5667                 return -EINVAL;
5668         /* These would render the backchannel useless: */
5669         if (rcvd->max_ops != sent->max_ops)
5670                 return -EINVAL;
5671         if (rcvd->max_reqs != sent->max_reqs)
5672                 return -EINVAL;
5673         return 0;
5674 }
5675
5676 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5677                                      struct nfs4_session *session)
5678 {
5679         int ret;
5680
5681         ret = nfs4_verify_fore_channel_attrs(args, session);
5682         if (ret)
5683                 return ret;
5684         return nfs4_verify_back_channel_attrs(args, session);
5685 }
5686
5687 static int _nfs4_proc_create_session(struct nfs_client *clp,
5688                 struct rpc_cred *cred)
5689 {
5690         struct nfs4_session *session = clp->cl_session;
5691         struct nfs41_create_session_args args = {
5692                 .client = clp,
5693                 .cb_program = NFS4_CALLBACK,
5694         };
5695         struct nfs41_create_session_res res = {
5696                 .client = clp,
5697         };
5698         struct rpc_message msg = {
5699                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5700                 .rpc_argp = &args,
5701                 .rpc_resp = &res,
5702                 .rpc_cred = cred,
5703         };
5704         int status;
5705
5706         nfs4_init_channel_attrs(&args);
5707         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5708
5709         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5710
5711         if (!status)
5712                 /* Verify the session's negotiated channel_attrs values */
5713                 status = nfs4_verify_channel_attrs(&args, session);
5714         if (!status) {
5715                 /* Increment the clientid slot sequence id */
5716                 clp->cl_seqid++;
5717         }
5718
5719         return status;
5720 }
5721
5722 /*
5723  * Issues a CREATE_SESSION operation to the server.
5724  * It is the responsibility of the caller to verify the session is
5725  * expired before calling this routine.
5726  */
5727 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5728 {
5729         int status;
5730         unsigned *ptr;
5731         struct nfs4_session *session = clp->cl_session;
5732
5733         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5734
5735         status = _nfs4_proc_create_session(clp, cred);
5736         if (status)
5737                 goto out;
5738
5739         /* Init or reset the session slot tables */
5740         status = nfs4_setup_session_slot_tables(session);
5741         dprintk("slot table setup returned %d\n", status);
5742         if (status)
5743                 goto out;
5744
5745         ptr = (unsigned *)&session->sess_id.data[0];
5746         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5747                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5748 out:
5749         dprintk("<-- %s\n", __func__);
5750         return status;
5751 }
5752
5753 /*
5754  * Issue the over-the-wire RPC DESTROY_SESSION.
5755  * The caller must serialize access to this routine.
5756  */
5757 int nfs4_proc_destroy_session(struct nfs4_session *session,
5758                 struct rpc_cred *cred)
5759 {
5760         struct rpc_message msg = {
5761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5762                 .rpc_argp = session,
5763                 .rpc_cred = cred,
5764         };
5765         int status = 0;
5766
5767         dprintk("--> nfs4_proc_destroy_session\n");
5768
5769         /* session is still being setup */
5770         if (session->clp->cl_cons_state != NFS_CS_READY)
5771                 return status;
5772
5773         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5774
5775         if (status)
5776                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5777                         "Session has been destroyed regardless...\n", status);
5778
5779         dprintk("<-- nfs4_proc_destroy_session\n");
5780         return status;
5781 }
5782
5783 /*
5784  * With sessions, the client is not marked ready until after a
5785  * successful EXCHANGE_ID and CREATE_SESSION.
5786  *
5787  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5788  * other versions of NFS can be tried.
5789  */
5790 static int nfs41_check_session_ready(struct nfs_client *clp)
5791 {
5792         int ret;
5793
5794         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
5795                 ret = nfs4_client_recover_expired_lease(clp);
5796                 if (ret)
5797                         return ret;
5798         }
5799         if (clp->cl_cons_state < NFS_CS_READY)
5800                 return -EPROTONOSUPPORT;
5801         smp_rmb();
5802         return 0;
5803 }
5804
5805 int nfs4_init_session(struct nfs_server *server)
5806 {
5807         struct nfs_client *clp = server->nfs_client;
5808         struct nfs4_session *session;
5809         unsigned int rsize, wsize;
5810
5811         if (!nfs4_has_session(clp))
5812                 return 0;
5813
5814         session = clp->cl_session;
5815         spin_lock(&clp->cl_lock);
5816         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5817
5818                 rsize = server->rsize;
5819                 if (rsize == 0)
5820                         rsize = NFS_MAX_FILE_IO_SIZE;
5821                 wsize = server->wsize;
5822                 if (wsize == 0)
5823                         wsize = NFS_MAX_FILE_IO_SIZE;
5824
5825                 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5826                 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5827         }
5828         spin_unlock(&clp->cl_lock);
5829
5830         return nfs41_check_session_ready(clp);
5831 }
5832
5833 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
5834 {
5835         struct nfs4_session *session = clp->cl_session;
5836         int ret;
5837
5838         spin_lock(&clp->cl_lock);
5839         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5840                 /*
5841                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
5842                  * DS lease to be equal to the MDS lease.
5843                  */
5844                 clp->cl_lease_time = lease_time;
5845                 clp->cl_last_renewal = jiffies;
5846         }
5847         spin_unlock(&clp->cl_lock);
5848
5849         ret = nfs41_check_session_ready(clp);
5850         if (ret)
5851                 return ret;
5852         /* Test for the DS role */
5853         if (!is_ds_client(clp))
5854                 return -ENODEV;
5855         return 0;
5856 }
5857 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5858
5859
5860 /*
5861  * Renew the cl_session lease.
5862  */
5863 struct nfs4_sequence_data {
5864         struct nfs_client *clp;
5865         struct nfs4_sequence_args args;
5866         struct nfs4_sequence_res res;
5867 };
5868
5869 static void nfs41_sequence_release(void *data)
5870 {
5871         struct nfs4_sequence_data *calldata = data;
5872         struct nfs_client *clp = calldata->clp;
5873
5874         if (atomic_read(&clp->cl_count) > 1)
5875                 nfs4_schedule_state_renewal(clp);
5876         nfs_put_client(clp);
5877         kfree(calldata);
5878 }
5879
5880 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5881 {
5882         switch(task->tk_status) {
5883         case -NFS4ERR_DELAY:
5884                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5885                 return -EAGAIN;
5886         default:
5887                 nfs4_schedule_lease_recovery(clp);
5888         }
5889         return 0;
5890 }
5891
5892 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5893 {
5894         struct nfs4_sequence_data *calldata = data;
5895         struct nfs_client *clp = calldata->clp;
5896
5897         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5898                 return;
5899
5900         if (task->tk_status < 0) {
5901                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5902                 if (atomic_read(&clp->cl_count) == 1)
5903                         goto out;
5904
5905                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5906                         rpc_restart_call_prepare(task);
5907                         return;
5908                 }
5909         }
5910         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5911 out:
5912         dprintk("<-- %s\n", __func__);
5913 }
5914
5915 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5916 {
5917         struct nfs4_sequence_data *calldata = data;
5918         struct nfs_client *clp = calldata->clp;
5919         struct nfs4_sequence_args *args;
5920         struct nfs4_sequence_res *res;
5921
5922         args = task->tk_msg.rpc_argp;
5923         res = task->tk_msg.rpc_resp;
5924
5925         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5926                 return;
5927         rpc_call_start(task);
5928 }
5929
5930 static const struct rpc_call_ops nfs41_sequence_ops = {
5931         .rpc_call_done = nfs41_sequence_call_done,
5932         .rpc_call_prepare = nfs41_sequence_prepare,
5933         .rpc_release = nfs41_sequence_release,
5934 };
5935
5936 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5937 {
5938         struct nfs4_sequence_data *calldata;
5939         struct rpc_message msg = {
5940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5941                 .rpc_cred = cred,
5942         };
5943         struct rpc_task_setup task_setup_data = {
5944                 .rpc_client = clp->cl_rpcclient,
5945                 .rpc_message = &msg,
5946                 .callback_ops = &nfs41_sequence_ops,
5947                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5948         };
5949
5950         if (!atomic_inc_not_zero(&clp->cl_count))
5951                 return ERR_PTR(-EIO);
5952         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5953         if (calldata == NULL) {
5954                 nfs_put_client(clp);
5955                 return ERR_PTR(-ENOMEM);
5956         }
5957         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5958         msg.rpc_argp = &calldata->args;
5959         msg.rpc_resp = &calldata->res;
5960         calldata->clp = clp;
5961         task_setup_data.callback_data = calldata;
5962
5963         return rpc_run_task(&task_setup_data);
5964 }
5965
5966 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5967 {
5968         struct rpc_task *task;
5969         int ret = 0;
5970
5971         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5972                 return 0;
5973         task = _nfs41_proc_sequence(clp, cred);
5974         if (IS_ERR(task))
5975                 ret = PTR_ERR(task);
5976         else
5977                 rpc_put_task_async(task);
5978         dprintk("<-- %s status=%d\n", __func__, ret);
5979         return ret;
5980 }
5981
5982 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5983 {
5984         struct rpc_task *task;
5985         int ret;
5986
5987         task = _nfs41_proc_sequence(clp, cred);
5988         if (IS_ERR(task)) {
5989                 ret = PTR_ERR(task);
5990                 goto out;
5991         }
5992         ret = rpc_wait_for_completion_task(task);
5993         if (!ret) {
5994                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5995
5996                 if (task->tk_status == 0)
5997                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5998                 ret = task->tk_status;
5999         }
6000         rpc_put_task(task);
6001 out:
6002         dprintk("<-- %s status=%d\n", __func__, ret);
6003         return ret;
6004 }
6005
6006 struct nfs4_reclaim_complete_data {
6007         struct nfs_client *clp;
6008         struct nfs41_reclaim_complete_args arg;
6009         struct nfs41_reclaim_complete_res res;
6010 };
6011
6012 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6013 {
6014         struct nfs4_reclaim_complete_data *calldata = data;
6015
6016         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6017         if (nfs41_setup_sequence(calldata->clp->cl_session,
6018                                 &calldata->arg.seq_args,
6019                                 &calldata->res.seq_res, task))
6020                 return;
6021
6022         rpc_call_start(task);
6023 }
6024
6025 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6026 {
6027         switch(task->tk_status) {
6028         case 0:
6029         case -NFS4ERR_COMPLETE_ALREADY:
6030         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6031                 break;
6032         case -NFS4ERR_DELAY:
6033                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6034                 /* fall through */
6035         case -NFS4ERR_RETRY_UNCACHED_REP:
6036                 return -EAGAIN;
6037         default:
6038                 nfs4_schedule_lease_recovery(clp);
6039         }
6040         return 0;
6041 }
6042
6043 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6044 {
6045         struct nfs4_reclaim_complete_data *calldata = data;
6046         struct nfs_client *clp = calldata->clp;
6047         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6048
6049         dprintk("--> %s\n", __func__);
6050         if (!nfs41_sequence_done(task, res))
6051                 return;
6052
6053         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6054                 rpc_restart_call_prepare(task);
6055                 return;
6056         }
6057         dprintk("<-- %s\n", __func__);
6058 }
6059
6060 static void nfs4_free_reclaim_complete_data(void *data)
6061 {
6062         struct nfs4_reclaim_complete_data *calldata = data;
6063
6064         kfree(calldata);
6065 }
6066
6067 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6068         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6069         .rpc_call_done = nfs4_reclaim_complete_done,
6070         .rpc_release = nfs4_free_reclaim_complete_data,
6071 };
6072
6073 /*
6074  * Issue a global reclaim complete.
6075  */
6076 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6077 {
6078         struct nfs4_reclaim_complete_data *calldata;
6079         struct rpc_task *task;
6080         struct rpc_message msg = {
6081                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6082         };
6083         struct rpc_task_setup task_setup_data = {
6084                 .rpc_client = clp->cl_rpcclient,
6085                 .rpc_message = &msg,
6086                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6087                 .flags = RPC_TASK_ASYNC,
6088         };
6089         int status = -ENOMEM;
6090
6091         dprintk("--> %s\n", __func__);
6092         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6093         if (calldata == NULL)
6094                 goto out;
6095         calldata->clp = clp;
6096         calldata->arg.one_fs = 0;
6097
6098         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6099         msg.rpc_argp = &calldata->arg;
6100         msg.rpc_resp = &calldata->res;
6101         task_setup_data.callback_data = calldata;
6102         task = rpc_run_task(&task_setup_data);
6103         if (IS_ERR(task)) {
6104                 status = PTR_ERR(task);
6105                 goto out;
6106         }
6107         status = nfs4_wait_for_completion_rpc_task(task);
6108         if (status == 0)
6109                 status = task->tk_status;
6110         rpc_put_task(task);
6111         return 0;
6112 out:
6113         dprintk("<-- %s status=%d\n", __func__, status);
6114         return status;
6115 }
6116
6117 static void
6118 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6119 {
6120         struct nfs4_layoutget *lgp = calldata;
6121         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6122
6123         dprintk("--> %s\n", __func__);
6124         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6125          * right now covering the LAYOUTGET we are about to send.
6126          * However, that is not so catastrophic, and there seems
6127          * to be no way to prevent it completely.
6128          */
6129         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6130                                 &lgp->res.seq_res, task))
6131                 return;
6132         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6133                                           NFS_I(lgp->args.inode)->layout,
6134                                           lgp->args.ctx->state)) {
6135                 rpc_exit(task, NFS4_OK);
6136                 return;
6137         }
6138         rpc_call_start(task);
6139 }
6140
6141 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6142 {
6143         struct nfs4_layoutget *lgp = calldata;
6144         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6145
6146         dprintk("--> %s\n", __func__);
6147
6148         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6149                 return;
6150
6151         switch (task->tk_status) {
6152         case 0:
6153                 break;
6154         case -NFS4ERR_LAYOUTTRYLATER:
6155         case -NFS4ERR_RECALLCONFLICT:
6156                 task->tk_status = -NFS4ERR_DELAY;
6157                 /* Fall through */
6158         default:
6159                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6160                         rpc_restart_call_prepare(task);
6161                         return;
6162                 }
6163         }
6164         dprintk("<-- %s\n", __func__);
6165 }
6166
6167 static void nfs4_layoutget_release(void *calldata)
6168 {
6169         struct nfs4_layoutget *lgp = calldata;
6170
6171         dprintk("--> %s\n", __func__);
6172         put_nfs_open_context(lgp->args.ctx);
6173         kfree(calldata);
6174         dprintk("<-- %s\n", __func__);
6175 }
6176
6177 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6178         .rpc_call_prepare = nfs4_layoutget_prepare,
6179         .rpc_call_done = nfs4_layoutget_done,
6180         .rpc_release = nfs4_layoutget_release,
6181 };
6182
6183 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
6184 {
6185         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6186         struct rpc_task *task;
6187         struct rpc_message msg = {
6188                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6189                 .rpc_argp = &lgp->args,
6190                 .rpc_resp = &lgp->res,
6191         };
6192         struct rpc_task_setup task_setup_data = {
6193                 .rpc_client = server->client,
6194                 .rpc_message = &msg,
6195                 .callback_ops = &nfs4_layoutget_call_ops,
6196                 .callback_data = lgp,
6197                 .flags = RPC_TASK_ASYNC,
6198         };
6199         int status = 0;
6200
6201         dprintk("--> %s\n", __func__);
6202
6203         lgp->res.layoutp = &lgp->args.layout;
6204         lgp->res.seq_res.sr_slot = NULL;
6205         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6206         task = rpc_run_task(&task_setup_data);
6207         if (IS_ERR(task))
6208                 return PTR_ERR(task);
6209         status = nfs4_wait_for_completion_rpc_task(task);
6210         if (status == 0)
6211                 status = task->tk_status;
6212         if (status == 0)
6213                 status = pnfs_layout_process(lgp);
6214         rpc_put_task(task);
6215         dprintk("<-- %s status=%d\n", __func__, status);
6216         return status;
6217 }
6218
6219 static void
6220 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6221 {
6222         struct nfs4_layoutreturn *lrp = calldata;
6223
6224         dprintk("--> %s\n", __func__);
6225         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6226                                 &lrp->res.seq_res, task))
6227                 return;
6228         rpc_call_start(task);
6229 }
6230
6231 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6232 {
6233         struct nfs4_layoutreturn *lrp = calldata;
6234         struct nfs_server *server;
6235         struct pnfs_layout_hdr *lo = lrp->args.layout;
6236
6237         dprintk("--> %s\n", __func__);
6238
6239         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6240                 return;
6241
6242         server = NFS_SERVER(lrp->args.inode);
6243         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6244                 rpc_restart_call_prepare(task);
6245                 return;
6246         }
6247         spin_lock(&lo->plh_inode->i_lock);
6248         if (task->tk_status == 0) {
6249                 if (lrp->res.lrs_present) {
6250                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6251                 } else
6252                         BUG_ON(!list_empty(&lo->plh_segs));
6253         }
6254         lo->plh_block_lgets--;
6255         spin_unlock(&lo->plh_inode->i_lock);
6256         dprintk("<-- %s\n", __func__);
6257 }
6258
6259 static void nfs4_layoutreturn_release(void *calldata)
6260 {
6261         struct nfs4_layoutreturn *lrp = calldata;
6262
6263         dprintk("--> %s\n", __func__);
6264         put_layout_hdr(lrp->args.layout);
6265         kfree(calldata);
6266         dprintk("<-- %s\n", __func__);
6267 }
6268
6269 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6270         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6271         .rpc_call_done = nfs4_layoutreturn_done,
6272         .rpc_release = nfs4_layoutreturn_release,
6273 };
6274
6275 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6276 {
6277         struct rpc_task *task;
6278         struct rpc_message msg = {
6279                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6280                 .rpc_argp = &lrp->args,
6281                 .rpc_resp = &lrp->res,
6282         };
6283         struct rpc_task_setup task_setup_data = {
6284                 .rpc_client = lrp->clp->cl_rpcclient,
6285                 .rpc_message = &msg,
6286                 .callback_ops = &nfs4_layoutreturn_call_ops,
6287                 .callback_data = lrp,
6288         };
6289         int status;
6290
6291         dprintk("--> %s\n", __func__);
6292         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6293         task = rpc_run_task(&task_setup_data);
6294         if (IS_ERR(task))
6295                 return PTR_ERR(task);
6296         status = task->tk_status;
6297         dprintk("<-- %s status=%d\n", __func__, status);
6298         rpc_put_task(task);
6299         return status;
6300 }
6301
6302 /*
6303  * Retrieve the list of Data Server devices from the MDS.
6304  */
6305 static int _nfs4_getdevicelist(struct nfs_server *server,
6306                                     const struct nfs_fh *fh,
6307                                     struct pnfs_devicelist *devlist)
6308 {
6309         struct nfs4_getdevicelist_args args = {
6310                 .fh = fh,
6311                 .layoutclass = server->pnfs_curr_ld->id,
6312         };
6313         struct nfs4_getdevicelist_res res = {
6314                 .devlist = devlist,
6315         };
6316         struct rpc_message msg = {
6317                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6318                 .rpc_argp = &args,
6319                 .rpc_resp = &res,
6320         };
6321         int status;
6322
6323         dprintk("--> %s\n", __func__);
6324         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6325                                 &res.seq_res, 0);
6326         dprintk("<-- %s status=%d\n", __func__, status);
6327         return status;
6328 }
6329
6330 int nfs4_proc_getdevicelist(struct nfs_server *server,
6331                             const struct nfs_fh *fh,
6332                             struct pnfs_devicelist *devlist)
6333 {
6334         struct nfs4_exception exception = { };
6335         int err;
6336
6337         do {
6338                 err = nfs4_handle_exception(server,
6339                                 _nfs4_getdevicelist(server, fh, devlist),
6340                                 &exception);
6341         } while (exception.retry);
6342
6343         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6344                 err, devlist->num_devs);
6345
6346         return err;
6347 }
6348 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6349
6350 static int
6351 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6352 {
6353         struct nfs4_getdeviceinfo_args args = {
6354                 .pdev = pdev,
6355         };
6356         struct nfs4_getdeviceinfo_res res = {
6357                 .pdev = pdev,
6358         };
6359         struct rpc_message msg = {
6360                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6361                 .rpc_argp = &args,
6362                 .rpc_resp = &res,
6363         };
6364         int status;
6365
6366         dprintk("--> %s\n", __func__);
6367         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6368         dprintk("<-- %s status=%d\n", __func__, status);
6369
6370         return status;
6371 }
6372
6373 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6374 {
6375         struct nfs4_exception exception = { };
6376         int err;
6377
6378         do {
6379                 err = nfs4_handle_exception(server,
6380                                         _nfs4_proc_getdeviceinfo(server, pdev),
6381                                         &exception);
6382         } while (exception.retry);
6383         return err;
6384 }
6385 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6386
6387 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6388 {
6389         struct nfs4_layoutcommit_data *data = calldata;
6390         struct nfs_server *server = NFS_SERVER(data->args.inode);
6391
6392         if (nfs4_setup_sequence(server, &data->args.seq_args,
6393                                 &data->res.seq_res, task))
6394                 return;
6395         rpc_call_start(task);
6396 }
6397
6398 static void
6399 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6400 {
6401         struct nfs4_layoutcommit_data *data = calldata;
6402         struct nfs_server *server = NFS_SERVER(data->args.inode);
6403
6404         if (!nfs4_sequence_done(task, &data->res.seq_res))
6405                 return;
6406
6407         switch (task->tk_status) { /* Just ignore these failures */
6408         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6409         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6410         case -NFS4ERR_BADLAYOUT:     /* no layout */
6411         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6412                 task->tk_status = 0;
6413                 break;
6414         case 0:
6415                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6416                                                    data->res.fattr);
6417                 break;
6418         default:
6419                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6420                         rpc_restart_call_prepare(task);
6421                         return;
6422                 }
6423         }
6424 }
6425
6426 static void nfs4_layoutcommit_release(void *calldata)
6427 {
6428         struct nfs4_layoutcommit_data *data = calldata;
6429         struct pnfs_layout_segment *lseg, *tmp;
6430         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6431
6432         pnfs_cleanup_layoutcommit(data);
6433         /* Matched by references in pnfs_set_layoutcommit */
6434         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6435                 list_del_init(&lseg->pls_lc_list);
6436                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6437                                        &lseg->pls_flags))
6438                         put_lseg(lseg);
6439         }
6440
6441         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6442         smp_mb__after_clear_bit();
6443         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6444
6445         put_rpccred(data->cred);
6446         kfree(data);
6447 }
6448
6449 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6450         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6451         .rpc_call_done = nfs4_layoutcommit_done,
6452         .rpc_release = nfs4_layoutcommit_release,
6453 };
6454
6455 int
6456 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6457 {
6458         struct rpc_message msg = {
6459                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6460                 .rpc_argp = &data->args,
6461                 .rpc_resp = &data->res,
6462                 .rpc_cred = data->cred,
6463         };
6464         struct rpc_task_setup task_setup_data = {
6465                 .task = &data->task,
6466                 .rpc_client = NFS_CLIENT(data->args.inode),
6467                 .rpc_message = &msg,
6468                 .callback_ops = &nfs4_layoutcommit_ops,
6469                 .callback_data = data,
6470                 .flags = RPC_TASK_ASYNC,
6471         };
6472         struct rpc_task *task;
6473         int status = 0;
6474
6475         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6476                 "lbw: %llu inode %lu\n",
6477                 data->task.tk_pid, sync,
6478                 data->args.lastbytewritten,
6479                 data->args.inode->i_ino);
6480
6481         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6482         task = rpc_run_task(&task_setup_data);
6483         if (IS_ERR(task))
6484                 return PTR_ERR(task);
6485         if (sync == false)
6486                 goto out;
6487         status = nfs4_wait_for_completion_rpc_task(task);
6488         if (status != 0)
6489                 goto out;
6490         status = task->tk_status;
6491 out:
6492         dprintk("%s: status %d\n", __func__, status);
6493         rpc_put_task(task);
6494         return status;
6495 }
6496
6497 static int
6498 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6499                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6500 {
6501         struct nfs41_secinfo_no_name_args args = {
6502                 .style = SECINFO_STYLE_CURRENT_FH,
6503         };
6504         struct nfs4_secinfo_res res = {
6505                 .flavors = flavors,
6506         };
6507         struct rpc_message msg = {
6508                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6509                 .rpc_argp = &args,
6510                 .rpc_resp = &res,
6511         };
6512         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6513 }
6514
6515 static int
6516 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6517                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6518 {
6519         struct nfs4_exception exception = { };
6520         int err;
6521         do {
6522                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6523                 switch (err) {
6524                 case 0:
6525                 case -NFS4ERR_WRONGSEC:
6526                 case -NFS4ERR_NOTSUPP:
6527                         goto out;
6528                 default:
6529                         err = nfs4_handle_exception(server, err, &exception);
6530                 }
6531         } while (exception.retry);
6532 out:
6533         return err;
6534 }
6535
6536 static int
6537 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6538                     struct nfs_fsinfo *info)
6539 {
6540         int err;
6541         struct page *page;
6542         rpc_authflavor_t flavor;
6543         struct nfs4_secinfo_flavors *flavors;
6544
6545         page = alloc_page(GFP_KERNEL);
6546         if (!page) {
6547                 err = -ENOMEM;
6548                 goto out;
6549         }
6550
6551         flavors = page_address(page);
6552         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6553
6554         /*
6555          * Fall back on "guess and check" method if
6556          * the server doesn't support SECINFO_NO_NAME
6557          */
6558         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6559                 err = nfs4_find_root_sec(server, fhandle, info);
6560                 goto out_freepage;
6561         }
6562         if (err)
6563                 goto out_freepage;
6564
6565         flavor = nfs_find_best_sec(flavors);
6566         if (err == 0)
6567                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6568
6569 out_freepage:
6570         put_page(page);
6571         if (err == -EACCES)
6572                 return -EPERM;
6573 out:
6574         return err;
6575 }
6576
6577 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6578 {
6579         int status;
6580         struct nfs41_test_stateid_args args = {
6581                 .stateid = stateid,
6582         };
6583         struct nfs41_test_stateid_res res;
6584         struct rpc_message msg = {
6585                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6586                 .rpc_argp = &args,
6587                 .rpc_resp = &res,
6588         };
6589
6590         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6591         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6592
6593         if (status == NFS_OK)
6594                 return res.status;
6595         return status;
6596 }
6597
6598 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6599 {
6600         struct nfs4_exception exception = { };
6601         int err;
6602         do {
6603                 err = nfs4_handle_exception(server,
6604                                 _nfs41_test_stateid(server, stateid),
6605                                 &exception);
6606         } while (exception.retry);
6607         return err;
6608 }
6609
6610 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6611 {
6612         struct nfs41_free_stateid_args args = {
6613                 .stateid = stateid,
6614         };
6615         struct nfs41_free_stateid_res res;
6616         struct rpc_message msg = {
6617                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6618                 .rpc_argp = &args,
6619                 .rpc_resp = &res,
6620         };
6621
6622         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6623         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6624 }
6625
6626 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6627 {
6628         struct nfs4_exception exception = { };
6629         int err;
6630         do {
6631                 err = nfs4_handle_exception(server,
6632                                 _nfs4_free_stateid(server, stateid),
6633                                 &exception);
6634         } while (exception.retry);
6635         return err;
6636 }
6637
6638 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6639                 const nfs4_stateid *s2)
6640 {
6641         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6642                 return false;
6643
6644         if (s1->seqid == s2->seqid)
6645                 return true;
6646         if (s1->seqid == 0 || s2->seqid == 0)
6647                 return true;
6648
6649         return false;
6650 }
6651
6652 #endif /* CONFIG_NFS_V4_1 */
6653
6654 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6655                 const nfs4_stateid *s2)
6656 {
6657         return nfs4_stateid_match(s1, s2);
6658 }
6659
6660
6661 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6662         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6663         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6664         .recover_open   = nfs4_open_reclaim,
6665         .recover_lock   = nfs4_lock_reclaim,
6666         .establish_clid = nfs4_init_clientid,
6667         .get_clid_cred  = nfs4_get_setclientid_cred,
6668 };
6669
6670 #if defined(CONFIG_NFS_V4_1)
6671 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6672         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6673         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6674         .recover_open   = nfs4_open_reclaim,
6675         .recover_lock   = nfs4_lock_reclaim,
6676         .establish_clid = nfs41_init_clientid,
6677         .get_clid_cred  = nfs4_get_exchange_id_cred,
6678         .reclaim_complete = nfs41_proc_reclaim_complete,
6679 };
6680 #endif /* CONFIG_NFS_V4_1 */
6681
6682 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6683         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6684         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6685         .recover_open   = nfs4_open_expired,
6686         .recover_lock   = nfs4_lock_expired,
6687         .establish_clid = nfs4_init_clientid,
6688         .get_clid_cred  = nfs4_get_setclientid_cred,
6689 };
6690
6691 #if defined(CONFIG_NFS_V4_1)
6692 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6693         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6694         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6695         .recover_open   = nfs41_open_expired,
6696         .recover_lock   = nfs41_lock_expired,
6697         .establish_clid = nfs41_init_clientid,
6698         .get_clid_cred  = nfs4_get_exchange_id_cred,
6699 };
6700 #endif /* CONFIG_NFS_V4_1 */
6701
6702 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6703         .sched_state_renewal = nfs4_proc_async_renew,
6704         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6705         .renew_lease = nfs4_proc_renew,
6706 };
6707
6708 #if defined(CONFIG_NFS_V4_1)
6709 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6710         .sched_state_renewal = nfs41_proc_async_sequence,
6711         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6712         .renew_lease = nfs4_proc_sequence,
6713 };
6714 #endif
6715
6716 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6717         .minor_version = 0,
6718         .call_sync = _nfs4_call_sync,
6719         .match_stateid = nfs4_match_stateid,
6720         .find_root_sec = nfs4_find_root_sec,
6721         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6722         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6723         .state_renewal_ops = &nfs40_state_renewal_ops,
6724 };
6725
6726 #if defined(CONFIG_NFS_V4_1)
6727 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6728         .minor_version = 1,
6729         .call_sync = _nfs4_call_sync_session,
6730         .match_stateid = nfs41_match_stateid,
6731         .find_root_sec = nfs41_find_root_sec,
6732         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6733         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6734         .state_renewal_ops = &nfs41_state_renewal_ops,
6735 };
6736 #endif
6737
6738 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6739         [0] = &nfs_v4_0_minor_ops,
6740 #if defined(CONFIG_NFS_V4_1)
6741         [1] = &nfs_v4_1_minor_ops,
6742 #endif
6743 };
6744
6745 static const struct inode_operations nfs4_file_inode_operations = {
6746         .permission     = nfs_permission,
6747         .getattr        = nfs_getattr,
6748         .setattr        = nfs_setattr,
6749         .getxattr       = generic_getxattr,
6750         .setxattr       = generic_setxattr,
6751         .listxattr      = generic_listxattr,
6752         .removexattr    = generic_removexattr,
6753 };
6754
6755 const struct nfs_rpc_ops nfs_v4_clientops = {
6756         .version        = 4,                    /* protocol version */
6757         .dentry_ops     = &nfs4_dentry_operations,
6758         .dir_inode_ops  = &nfs4_dir_inode_operations,
6759         .file_inode_ops = &nfs4_file_inode_operations,
6760         .file_ops       = &nfs4_file_operations,
6761         .getroot        = nfs4_proc_get_root,
6762         .submount       = nfs4_submount,
6763         .getattr        = nfs4_proc_getattr,
6764         .setattr        = nfs4_proc_setattr,
6765         .lookup         = nfs4_proc_lookup,
6766         .access         = nfs4_proc_access,
6767         .readlink       = nfs4_proc_readlink,
6768         .create         = nfs4_proc_create,
6769         .remove         = nfs4_proc_remove,
6770         .unlink_setup   = nfs4_proc_unlink_setup,
6771         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6772         .unlink_done    = nfs4_proc_unlink_done,
6773         .rename         = nfs4_proc_rename,
6774         .rename_setup   = nfs4_proc_rename_setup,
6775         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6776         .rename_done    = nfs4_proc_rename_done,
6777         .link           = nfs4_proc_link,
6778         .symlink        = nfs4_proc_symlink,
6779         .mkdir          = nfs4_proc_mkdir,
6780         .rmdir          = nfs4_proc_remove,
6781         .readdir        = nfs4_proc_readdir,
6782         .mknod          = nfs4_proc_mknod,
6783         .statfs         = nfs4_proc_statfs,
6784         .fsinfo         = nfs4_proc_fsinfo,
6785         .pathconf       = nfs4_proc_pathconf,
6786         .set_capabilities = nfs4_server_capabilities,
6787         .decode_dirent  = nfs4_decode_dirent,
6788         .read_setup     = nfs4_proc_read_setup,
6789         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6790         .read_done      = nfs4_read_done,
6791         .write_setup    = nfs4_proc_write_setup,
6792         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6793         .write_done     = nfs4_write_done,
6794         .commit_setup   = nfs4_proc_commit_setup,
6795         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6796         .commit_done    = nfs4_commit_done,
6797         .lock           = nfs4_proc_lock,
6798         .clear_acl_cache = nfs4_zap_acl_attr,
6799         .close_context  = nfs4_close_context,
6800         .open_context   = nfs4_atomic_open,
6801         .init_client    = nfs4_init_client,
6802 };
6803
6804 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6805         .prefix = XATTR_NAME_NFSV4_ACL,
6806         .list   = nfs4_xattr_list_nfs4_acl,
6807         .get    = nfs4_xattr_get_nfs4_acl,
6808         .set    = nfs4_xattr_set_nfs4_acl,
6809 };
6810
6811 const struct xattr_handler *nfs4_xattr_handlers[] = {
6812         &nfs4_xattr_nfs4_acl_handler,
6813         NULL
6814 };
6815
6816 module_param(max_session_slots, ushort, 0644);
6817 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6818                 "requests the client will negotiate");
6819
6820 /*
6821  * Local variables:
6822  *  c-basic-offset: 8
6823  * End:
6824  */