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  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2810  */
2811 static int
2812 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2813                  int flags)
2814 {
2815         struct nfs_open_context *ctx;
2816         struct nfs4_state *state;
2817         int status = 0;
2818
2819         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2820         if (IS_ERR(ctx))
2821                 return PTR_ERR(ctx);
2822
2823         sattr->ia_mode &= ~current_umask();
2824         state = nfs4_do_open(dir, dentry, ctx->mode, flags, sattr, ctx->cred, NULL);
2825         d_drop(dentry);
2826         if (IS_ERR(state)) {
2827                 status = PTR_ERR(state);
2828                 goto out;
2829         }
2830         d_add(dentry, igrab(state->inode));
2831         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2832         ctx->state = state;
2833 out:
2834         put_nfs_open_context(ctx);
2835         return status;
2836 }
2837
2838 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2839 {
2840         struct nfs_server *server = NFS_SERVER(dir);
2841         struct nfs_removeargs args = {
2842                 .fh = NFS_FH(dir),
2843                 .name = *name,
2844         };
2845         struct nfs_removeres res = {
2846                 .server = server,
2847         };
2848         struct rpc_message msg = {
2849                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2850                 .rpc_argp = &args,
2851                 .rpc_resp = &res,
2852         };
2853         int status;
2854
2855         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2856         if (status == 0)
2857                 update_changeattr(dir, &res.cinfo);
2858         return status;
2859 }
2860
2861 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2862 {
2863         struct nfs4_exception exception = { };
2864         int err;
2865         do {
2866                 err = nfs4_handle_exception(NFS_SERVER(dir),
2867                                 _nfs4_proc_remove(dir, name),
2868                                 &exception);
2869         } while (exception.retry);
2870         return err;
2871 }
2872
2873 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2874 {
2875         struct nfs_server *server = NFS_SERVER(dir);
2876         struct nfs_removeargs *args = msg->rpc_argp;
2877         struct nfs_removeres *res = msg->rpc_resp;
2878
2879         res->server = server;
2880         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2881         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2882 }
2883
2884 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2885 {
2886         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2887                                 &data->args.seq_args,
2888                                 &data->res.seq_res,
2889                                 task))
2890                 return;
2891         rpc_call_start(task);
2892 }
2893
2894 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2895 {
2896         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2897
2898         if (!nfs4_sequence_done(task, &res->seq_res))
2899                 return 0;
2900         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2901                 return 0;
2902         update_changeattr(dir, &res->cinfo);
2903         return 1;
2904 }
2905
2906 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2907 {
2908         struct nfs_server *server = NFS_SERVER(dir);
2909         struct nfs_renameargs *arg = msg->rpc_argp;
2910         struct nfs_renameres *res = msg->rpc_resp;
2911
2912         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2913         res->server = server;
2914         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2915 }
2916
2917 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2918 {
2919         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2920                                 &data->args.seq_args,
2921                                 &data->res.seq_res,
2922                                 task))
2923                 return;
2924         rpc_call_start(task);
2925 }
2926
2927 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2928                                  struct inode *new_dir)
2929 {
2930         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2931
2932         if (!nfs4_sequence_done(task, &res->seq_res))
2933                 return 0;
2934         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2935                 return 0;
2936
2937         update_changeattr(old_dir, &res->old_cinfo);
2938         update_changeattr(new_dir, &res->new_cinfo);
2939         return 1;
2940 }
2941
2942 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2943                 struct inode *new_dir, struct qstr *new_name)
2944 {
2945         struct nfs_server *server = NFS_SERVER(old_dir);
2946         struct nfs_renameargs arg = {
2947                 .old_dir = NFS_FH(old_dir),
2948                 .new_dir = NFS_FH(new_dir),
2949                 .old_name = old_name,
2950                 .new_name = new_name,
2951         };
2952         struct nfs_renameres res = {
2953                 .server = server,
2954         };
2955         struct rpc_message msg = {
2956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2957                 .rpc_argp = &arg,
2958                 .rpc_resp = &res,
2959         };
2960         int status = -ENOMEM;
2961
2962         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2963         if (!status) {
2964                 update_changeattr(old_dir, &res.old_cinfo);
2965                 update_changeattr(new_dir, &res.new_cinfo);
2966         }
2967         return status;
2968 }
2969
2970 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2971                 struct inode *new_dir, struct qstr *new_name)
2972 {
2973         struct nfs4_exception exception = { };
2974         int err;
2975         do {
2976                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2977                                 _nfs4_proc_rename(old_dir, old_name,
2978                                         new_dir, new_name),
2979                                 &exception);
2980         } while (exception.retry);
2981         return err;
2982 }
2983
2984 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2985 {
2986         struct nfs_server *server = NFS_SERVER(inode);
2987         struct nfs4_link_arg arg = {
2988                 .fh     = NFS_FH(inode),
2989                 .dir_fh = NFS_FH(dir),
2990                 .name   = name,
2991                 .bitmask = server->attr_bitmask,
2992         };
2993         struct nfs4_link_res res = {
2994                 .server = server,
2995         };
2996         struct rpc_message msg = {
2997                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2998                 .rpc_argp = &arg,
2999                 .rpc_resp = &res,
3000         };
3001         int status = -ENOMEM;
3002
3003         res.fattr = nfs_alloc_fattr();
3004         if (res.fattr == NULL)
3005                 goto out;
3006
3007         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3008         if (!status) {
3009                 update_changeattr(dir, &res.cinfo);
3010                 nfs_post_op_update_inode(inode, res.fattr);
3011         }
3012 out:
3013         nfs_free_fattr(res.fattr);
3014         return status;
3015 }
3016
3017 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3018 {
3019         struct nfs4_exception exception = { };
3020         int err;
3021         do {
3022                 err = nfs4_handle_exception(NFS_SERVER(inode),
3023                                 _nfs4_proc_link(inode, dir, name),
3024                                 &exception);
3025         } while (exception.retry);
3026         return err;
3027 }
3028
3029 struct nfs4_createdata {
3030         struct rpc_message msg;
3031         struct nfs4_create_arg arg;
3032         struct nfs4_create_res res;
3033         struct nfs_fh fh;
3034         struct nfs_fattr fattr;
3035 };
3036
3037 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3038                 struct qstr *name, struct iattr *sattr, u32 ftype)
3039 {
3040         struct nfs4_createdata *data;
3041
3042         data = kzalloc(sizeof(*data), GFP_KERNEL);
3043         if (data != NULL) {
3044                 struct nfs_server *server = NFS_SERVER(dir);
3045
3046                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3047                 data->msg.rpc_argp = &data->arg;
3048                 data->msg.rpc_resp = &data->res;
3049                 data->arg.dir_fh = NFS_FH(dir);
3050                 data->arg.server = server;
3051                 data->arg.name = name;
3052                 data->arg.attrs = sattr;
3053                 data->arg.ftype = ftype;
3054                 data->arg.bitmask = server->attr_bitmask;
3055                 data->res.server = server;
3056                 data->res.fh = &data->fh;
3057                 data->res.fattr = &data->fattr;
3058                 nfs_fattr_init(data->res.fattr);
3059         }
3060         return data;
3061 }
3062
3063 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3064 {
3065         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3066                                     &data->arg.seq_args, &data->res.seq_res, 1);
3067         if (status == 0) {
3068                 update_changeattr(dir, &data->res.dir_cinfo);
3069                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3070         }
3071         return status;
3072 }
3073
3074 static void nfs4_free_createdata(struct nfs4_createdata *data)
3075 {
3076         kfree(data);
3077 }
3078
3079 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3080                 struct page *page, unsigned int len, struct iattr *sattr)
3081 {
3082         struct nfs4_createdata *data;
3083         int status = -ENAMETOOLONG;
3084
3085         if (len > NFS4_MAXPATHLEN)
3086                 goto out;
3087
3088         status = -ENOMEM;
3089         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3090         if (data == NULL)
3091                 goto out;
3092
3093         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3094         data->arg.u.symlink.pages = &page;
3095         data->arg.u.symlink.len = len;
3096
3097         status = nfs4_do_create(dir, dentry, data);
3098
3099         nfs4_free_createdata(data);
3100 out:
3101         return status;
3102 }
3103
3104 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3105                 struct page *page, unsigned int len, struct iattr *sattr)
3106 {
3107         struct nfs4_exception exception = { };
3108         int err;
3109         do {
3110                 err = nfs4_handle_exception(NFS_SERVER(dir),
3111                                 _nfs4_proc_symlink(dir, dentry, page,
3112                                                         len, sattr),
3113                                 &exception);
3114         } while (exception.retry);
3115         return err;
3116 }
3117
3118 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3119                 struct iattr *sattr)
3120 {
3121         struct nfs4_createdata *data;
3122         int status = -ENOMEM;
3123
3124         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3125         if (data == NULL)
3126                 goto out;
3127
3128         status = nfs4_do_create(dir, dentry, data);
3129
3130         nfs4_free_createdata(data);
3131 out:
3132         return status;
3133 }
3134
3135 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3136                 struct iattr *sattr)
3137 {
3138         struct nfs4_exception exception = { };
3139         int err;
3140
3141         sattr->ia_mode &= ~current_umask();
3142         do {
3143                 err = nfs4_handle_exception(NFS_SERVER(dir),
3144                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3145                                 &exception);
3146         } while (exception.retry);
3147         return err;
3148 }
3149
3150 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3151                 u64 cookie, struct page **pages, unsigned int count, int plus)
3152 {
3153         struct inode            *dir = dentry->d_inode;
3154         struct nfs4_readdir_arg args = {
3155                 .fh = NFS_FH(dir),
3156                 .pages = pages,
3157                 .pgbase = 0,
3158                 .count = count,
3159                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3160                 .plus = plus,
3161         };
3162         struct nfs4_readdir_res res;
3163         struct rpc_message msg = {
3164                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3165                 .rpc_argp = &args,
3166                 .rpc_resp = &res,
3167                 .rpc_cred = cred,
3168         };
3169         int                     status;
3170
3171         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3172                         dentry->d_parent->d_name.name,
3173                         dentry->d_name.name,
3174                         (unsigned long long)cookie);
3175         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3176         res.pgbase = args.pgbase;
3177         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3178         if (status >= 0) {
3179                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3180                 status += args.pgbase;
3181         }
3182
3183         nfs_invalidate_atime(dir);
3184
3185         dprintk("%s: returns %d\n", __func__, status);
3186         return status;
3187 }
3188
3189 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3190                 u64 cookie, struct page **pages, unsigned int count, int plus)
3191 {
3192         struct nfs4_exception exception = { };
3193         int err;
3194         do {
3195                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3196                                 _nfs4_proc_readdir(dentry, cred, cookie,
3197                                         pages, count, plus),
3198                                 &exception);
3199         } while (exception.retry);
3200         return err;
3201 }
3202
3203 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3204                 struct iattr *sattr, dev_t rdev)
3205 {
3206         struct nfs4_createdata *data;
3207         int mode = sattr->ia_mode;
3208         int status = -ENOMEM;
3209
3210         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3211         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3212
3213         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3214         if (data == NULL)
3215                 goto out;
3216
3217         if (S_ISFIFO(mode))
3218                 data->arg.ftype = NF4FIFO;
3219         else if (S_ISBLK(mode)) {
3220                 data->arg.ftype = NF4BLK;
3221                 data->arg.u.device.specdata1 = MAJOR(rdev);
3222                 data->arg.u.device.specdata2 = MINOR(rdev);
3223         }
3224         else if (S_ISCHR(mode)) {
3225                 data->arg.ftype = NF4CHR;
3226                 data->arg.u.device.specdata1 = MAJOR(rdev);
3227                 data->arg.u.device.specdata2 = MINOR(rdev);
3228         }
3229
3230         status = nfs4_do_create(dir, dentry, data);
3231
3232         nfs4_free_createdata(data);
3233 out:
3234         return status;
3235 }
3236
3237 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3238                 struct iattr *sattr, dev_t rdev)
3239 {
3240         struct nfs4_exception exception = { };
3241         int err;
3242
3243         sattr->ia_mode &= ~current_umask();
3244         do {
3245                 err = nfs4_handle_exception(NFS_SERVER(dir),
3246                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3247                                 &exception);
3248         } while (exception.retry);
3249         return err;
3250 }
3251
3252 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3253                  struct nfs_fsstat *fsstat)
3254 {
3255         struct nfs4_statfs_arg args = {
3256                 .fh = fhandle,
3257                 .bitmask = server->attr_bitmask,
3258         };
3259         struct nfs4_statfs_res res = {
3260                 .fsstat = fsstat,
3261         };
3262         struct rpc_message msg = {
3263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3264                 .rpc_argp = &args,
3265                 .rpc_resp = &res,
3266         };
3267
3268         nfs_fattr_init(fsstat->fattr);
3269         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3270 }
3271
3272 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3273 {
3274         struct nfs4_exception exception = { };
3275         int err;
3276         do {
3277                 err = nfs4_handle_exception(server,
3278                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3279                                 &exception);
3280         } while (exception.retry);
3281         return err;
3282 }
3283
3284 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3285                 struct nfs_fsinfo *fsinfo)
3286 {
3287         struct nfs4_fsinfo_arg args = {
3288                 .fh = fhandle,
3289                 .bitmask = server->attr_bitmask,
3290         };
3291         struct nfs4_fsinfo_res res = {
3292                 .fsinfo = fsinfo,
3293         };
3294         struct rpc_message msg = {
3295                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3296                 .rpc_argp = &args,
3297                 .rpc_resp = &res,
3298         };
3299
3300         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3301 }
3302
3303 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3304 {
3305         struct nfs4_exception exception = { };
3306         int err;
3307
3308         do {
3309                 err = nfs4_handle_exception(server,
3310                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3311                                 &exception);
3312         } while (exception.retry);
3313         return err;
3314 }
3315
3316 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3317 {
3318         nfs_fattr_init(fsinfo->fattr);
3319         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3320 }
3321
3322 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3323                 struct nfs_pathconf *pathconf)
3324 {
3325         struct nfs4_pathconf_arg args = {
3326                 .fh = fhandle,
3327                 .bitmask = server->attr_bitmask,
3328         };
3329         struct nfs4_pathconf_res res = {
3330                 .pathconf = pathconf,
3331         };
3332         struct rpc_message msg = {
3333                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3334                 .rpc_argp = &args,
3335                 .rpc_resp = &res,
3336         };
3337
3338         /* None of the pathconf attributes are mandatory to implement */
3339         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3340                 memset(pathconf, 0, sizeof(*pathconf));
3341                 return 0;
3342         }
3343
3344         nfs_fattr_init(pathconf->fattr);
3345         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3346 }
3347
3348 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3349                 struct nfs_pathconf *pathconf)
3350 {
3351         struct nfs4_exception exception = { };
3352         int err;
3353
3354         do {
3355                 err = nfs4_handle_exception(server,
3356                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3357                                 &exception);
3358         } while (exception.retry);
3359         return err;
3360 }
3361
3362 void __nfs4_read_done_cb(struct nfs_read_data *data)
3363 {
3364         nfs_invalidate_atime(data->header->inode);
3365 }
3366
3367 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3368 {
3369         struct nfs_server *server = NFS_SERVER(data->header->inode);
3370
3371         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3372                 rpc_restart_call_prepare(task);
3373                 return -EAGAIN;
3374         }
3375
3376         __nfs4_read_done_cb(data);
3377         if (task->tk_status > 0)
3378                 renew_lease(server, data->timestamp);
3379         return 0;
3380 }
3381
3382 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3383 {
3384
3385         dprintk("--> %s\n", __func__);
3386
3387         if (!nfs4_sequence_done(task, &data->res.seq_res))
3388                 return -EAGAIN;
3389
3390         return data->read_done_cb ? data->read_done_cb(task, data) :
3391                                     nfs4_read_done_cb(task, data);
3392 }
3393
3394 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3395 {
3396         data->timestamp   = jiffies;
3397         data->read_done_cb = nfs4_read_done_cb;
3398         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3399         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3400 }
3401
3402 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3403 {
3404         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3405                                 &data->args.seq_args,
3406                                 &data->res.seq_res,
3407                                 task))
3408                 return;
3409         rpc_call_start(task);
3410 }
3411
3412 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3413 {
3414         struct inode *inode = data->header->inode;
3415
3416         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3417                 rpc_restart_call_prepare(task);
3418                 return -EAGAIN;
3419         }
3420         if (task->tk_status >= 0) {
3421                 renew_lease(NFS_SERVER(inode), data->timestamp);
3422                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3423         }
3424         return 0;
3425 }
3426
3427 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3428 {
3429         if (!nfs4_sequence_done(task, &data->res.seq_res))
3430                 return -EAGAIN;
3431         return data->write_done_cb ? data->write_done_cb(task, data) :
3432                 nfs4_write_done_cb(task, data);
3433 }
3434
3435 static
3436 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3437 {
3438         const struct nfs_pgio_header *hdr = data->header;
3439
3440         /* Don't request attributes for pNFS or O_DIRECT writes */
3441         if (data->ds_clp != NULL || hdr->dreq != NULL)
3442                 return false;
3443         /* Otherwise, request attributes if and only if we don't hold
3444          * a delegation
3445          */
3446         return nfs_have_delegation(hdr->inode, FMODE_READ) == 0;
3447 }
3448
3449 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3450 {
3451         struct nfs_server *server = NFS_SERVER(data->header->inode);
3452
3453         if (!nfs4_write_need_cache_consistency_data(data)) {
3454                 data->args.bitmask = NULL;
3455                 data->res.fattr = NULL;
3456         } else
3457                 data->args.bitmask = server->cache_consistency_bitmask;
3458
3459         if (!data->write_done_cb)
3460                 data->write_done_cb = nfs4_write_done_cb;
3461         data->res.server = server;
3462         data->timestamp   = jiffies;
3463
3464         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3465         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3466 }
3467
3468 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3469 {
3470         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3471                                 &data->args.seq_args,
3472                                 &data->res.seq_res,
3473                                 task))
3474                 return;
3475         rpc_call_start(task);
3476 }
3477
3478 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3479 {
3480         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3481                                 &data->args.seq_args,
3482                                 &data->res.seq_res,
3483                                 task))
3484                 return;
3485         rpc_call_start(task);
3486 }
3487
3488 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3489 {
3490         struct inode *inode = data->inode;
3491
3492         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3493                 rpc_restart_call_prepare(task);
3494                 return -EAGAIN;
3495         }
3496         return 0;
3497 }
3498
3499 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3500 {
3501         if (!nfs4_sequence_done(task, &data->res.seq_res))
3502                 return -EAGAIN;
3503         return data->commit_done_cb(task, data);
3504 }
3505
3506 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3507 {
3508         struct nfs_server *server = NFS_SERVER(data->inode);
3509
3510         if (data->commit_done_cb == NULL)
3511                 data->commit_done_cb = nfs4_commit_done_cb;
3512         data->res.server = server;
3513         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3514         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3515 }
3516
3517 struct nfs4_renewdata {
3518         struct nfs_client       *client;
3519         unsigned long           timestamp;
3520 };
3521
3522 /*
3523  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3524  * standalone procedure for queueing an asynchronous RENEW.
3525  */
3526 static void nfs4_renew_release(void *calldata)
3527 {
3528         struct nfs4_renewdata *data = calldata;
3529         struct nfs_client *clp = data->client;
3530
3531         if (atomic_read(&clp->cl_count) > 1)
3532                 nfs4_schedule_state_renewal(clp);
3533         nfs_put_client(clp);
3534         kfree(data);
3535 }
3536
3537 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3538 {
3539         struct nfs4_renewdata *data = calldata;
3540         struct nfs_client *clp = data->client;
3541         unsigned long timestamp = data->timestamp;
3542
3543         if (task->tk_status < 0) {
3544                 /* Unless we're shutting down, schedule state recovery! */
3545                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3546                         return;
3547                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3548                         nfs4_schedule_lease_recovery(clp);
3549                         return;
3550                 }
3551                 nfs4_schedule_path_down_recovery(clp);
3552         }
3553         do_renew_lease(clp, timestamp);
3554 }
3555
3556 static const struct rpc_call_ops nfs4_renew_ops = {
3557         .rpc_call_done = nfs4_renew_done,
3558         .rpc_release = nfs4_renew_release,
3559 };
3560
3561 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3562 {
3563         struct rpc_message msg = {
3564                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3565                 .rpc_argp       = clp,
3566                 .rpc_cred       = cred,
3567         };
3568         struct nfs4_renewdata *data;
3569
3570         if (renew_flags == 0)
3571                 return 0;
3572         if (!atomic_inc_not_zero(&clp->cl_count))
3573                 return -EIO;
3574         data = kmalloc(sizeof(*data), GFP_NOFS);
3575         if (data == NULL)
3576                 return -ENOMEM;
3577         data->client = clp;
3578         data->timestamp = jiffies;
3579         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3580                         &nfs4_renew_ops, data);
3581 }
3582
3583 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3584 {
3585         struct rpc_message msg = {
3586                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3587                 .rpc_argp       = clp,
3588                 .rpc_cred       = cred,
3589         };
3590         unsigned long now = jiffies;
3591         int status;
3592
3593         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3594         if (status < 0)
3595                 return status;
3596         do_renew_lease(clp, now);
3597         return 0;
3598 }
3599
3600 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3601 {
3602         return (server->caps & NFS_CAP_ACLS)
3603                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3604                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3605 }
3606
3607 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3608  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3609  * the stack.
3610  */
3611 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3612
3613 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3614                 struct page **pages, unsigned int *pgbase)
3615 {
3616         struct page *newpage, **spages;
3617         int rc = 0;
3618         size_t len;
3619         spages = pages;
3620
3621         do {
3622                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3623                 newpage = alloc_page(GFP_KERNEL);
3624
3625                 if (newpage == NULL)
3626                         goto unwind;
3627                 memcpy(page_address(newpage), buf, len);
3628                 buf += len;
3629                 buflen -= len;
3630                 *pages++ = newpage;
3631                 rc++;
3632         } while (buflen != 0);
3633
3634         return rc;
3635
3636 unwind:
3637         for(; rc > 0; rc--)
3638                 __free_page(spages[rc-1]);
3639         return -ENOMEM;
3640 }
3641
3642 struct nfs4_cached_acl {
3643         int cached;
3644         size_t len;
3645         char data[0];
3646 };
3647
3648 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3649 {
3650         struct nfs_inode *nfsi = NFS_I(inode);
3651
3652         spin_lock(&inode->i_lock);
3653         kfree(nfsi->nfs4_acl);
3654         nfsi->nfs4_acl = acl;
3655         spin_unlock(&inode->i_lock);
3656 }
3657
3658 static void nfs4_zap_acl_attr(struct inode *inode)
3659 {
3660         nfs4_set_cached_acl(inode, NULL);
3661 }
3662
3663 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3664 {
3665         struct nfs_inode *nfsi = NFS_I(inode);
3666         struct nfs4_cached_acl *acl;
3667         int ret = -ENOENT;
3668
3669         spin_lock(&inode->i_lock);
3670         acl = nfsi->nfs4_acl;
3671         if (acl == NULL)
3672                 goto out;
3673         if (buf == NULL) /* user is just asking for length */
3674                 goto out_len;
3675         if (acl->cached == 0)
3676                 goto out;
3677         ret = -ERANGE; /* see getxattr(2) man page */
3678         if (acl->len > buflen)
3679                 goto out;
3680         memcpy(buf, acl->data, acl->len);
3681 out_len:
3682         ret = acl->len;
3683 out:
3684         spin_unlock(&inode->i_lock);
3685         return ret;
3686 }
3687
3688 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3689 {
3690         struct nfs4_cached_acl *acl;
3691
3692         if (pages && acl_len <= PAGE_SIZE) {
3693                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3694                 if (acl == NULL)
3695                         goto out;
3696                 acl->cached = 1;
3697                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3698         } else {
3699                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3700                 if (acl == NULL)
3701                         goto out;
3702                 acl->cached = 0;
3703         }
3704         acl->len = acl_len;
3705 out:
3706         nfs4_set_cached_acl(inode, acl);
3707 }
3708
3709 /*
3710  * The getxattr API returns the required buffer length when called with a
3711  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3712  * the required buf.  On a NULL buf, we send a page of data to the server
3713  * guessing that the ACL request can be serviced by a page. If so, we cache
3714  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3715  * the cache. If not so, we throw away the page, and cache the required
3716  * length. The next getxattr call will then produce another round trip to
3717  * the server, this time with the input buf of the required size.
3718  */
3719 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3720 {
3721         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3722         struct nfs_getaclargs args = {
3723                 .fh = NFS_FH(inode),
3724                 .acl_pages = pages,
3725                 .acl_len = buflen,
3726         };
3727         struct nfs_getaclres res = {
3728                 .acl_len = buflen,
3729         };
3730         struct rpc_message msg = {
3731                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3732                 .rpc_argp = &args,
3733                 .rpc_resp = &res,
3734         };
3735         int ret = -ENOMEM, npages, i, acl_len = 0;
3736
3737         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3738         /* As long as we're doing a round trip to the server anyway,
3739          * let's be prepared for a page of acl data. */
3740         if (npages == 0)
3741                 npages = 1;
3742
3743         /* Add an extra page to handle the bitmap returned */
3744         npages++;
3745
3746         for (i = 0; i < npages; i++) {
3747                 pages[i] = alloc_page(GFP_KERNEL);
3748                 if (!pages[i])
3749                         goto out_free;
3750         }
3751
3752         /* for decoding across pages */
3753         res.acl_scratch = alloc_page(GFP_KERNEL);
3754         if (!res.acl_scratch)
3755                 goto out_free;
3756
3757         args.acl_len = npages * PAGE_SIZE;
3758         args.acl_pgbase = 0;
3759
3760         /* Let decode_getfacl know not to fail if the ACL data is larger than
3761          * the page we send as a guess */
3762         if (buf == NULL)
3763                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3764
3765         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3766                 __func__, buf, buflen, npages, args.acl_len);
3767         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3768                              &msg, &args.seq_args, &res.seq_res, 0);
3769         if (ret)
3770                 goto out_free;
3771
3772         acl_len = res.acl_len - res.acl_data_offset;
3773         if (acl_len > args.acl_len)
3774                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3775         else
3776                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3777                                       acl_len);
3778         if (buf) {
3779                 ret = -ERANGE;
3780                 if (acl_len > buflen)
3781                         goto out_free;
3782                 _copy_from_pages(buf, pages, res.acl_data_offset,
3783                                 acl_len);
3784         }
3785         ret = acl_len;
3786 out_free:
3787         for (i = 0; i < npages; i++)
3788                 if (pages[i])
3789                         __free_page(pages[i]);
3790         if (res.acl_scratch)
3791                 __free_page(res.acl_scratch);
3792         return ret;
3793 }
3794
3795 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3796 {
3797         struct nfs4_exception exception = { };
3798         ssize_t ret;
3799         do {
3800                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3801                 if (ret >= 0)
3802                         break;
3803                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3804         } while (exception.retry);
3805         return ret;
3806 }
3807
3808 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3809 {
3810         struct nfs_server *server = NFS_SERVER(inode);
3811         int ret;
3812
3813         if (!nfs4_server_supports_acls(server))
3814                 return -EOPNOTSUPP;
3815         ret = nfs_revalidate_inode(server, inode);
3816         if (ret < 0)
3817                 return ret;
3818         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3819                 nfs_zap_acl_cache(inode);
3820         ret = nfs4_read_cached_acl(inode, buf, buflen);
3821         if (ret != -ENOENT)
3822                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3823                  * but no cached acl data, just the acl length */
3824                 return ret;
3825         return nfs4_get_acl_uncached(inode, buf, buflen);
3826 }
3827
3828 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3829 {
3830         struct nfs_server *server = NFS_SERVER(inode);
3831         struct page *pages[NFS4ACL_MAXPAGES];
3832         struct nfs_setaclargs arg = {
3833                 .fh             = NFS_FH(inode),
3834                 .acl_pages      = pages,
3835                 .acl_len        = buflen,
3836         };
3837         struct nfs_setaclres res;
3838         struct rpc_message msg = {
3839                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3840                 .rpc_argp       = &arg,
3841                 .rpc_resp       = &res,
3842         };
3843         int ret, i;
3844
3845         if (!nfs4_server_supports_acls(server))
3846                 return -EOPNOTSUPP;
3847         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3848         if (i < 0)
3849                 return i;
3850         nfs_inode_return_delegation(inode);
3851         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3852
3853         /*
3854          * Free each page after tx, so the only ref left is
3855          * held by the network stack
3856          */
3857         for (; i > 0; i--)
3858                 put_page(pages[i-1]);
3859
3860         /*
3861          * Acl update can result in inode attribute update.
3862          * so mark the attribute cache invalid.
3863          */
3864         spin_lock(&inode->i_lock);
3865         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3866         spin_unlock(&inode->i_lock);
3867         nfs_access_zap_cache(inode);
3868         nfs_zap_acl_cache(inode);
3869         return ret;
3870 }
3871
3872 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3873 {
3874         struct nfs4_exception exception = { };
3875         int err;
3876         do {
3877                 err = nfs4_handle_exception(NFS_SERVER(inode),
3878                                 __nfs4_proc_set_acl(inode, buf, buflen),
3879                                 &exception);
3880         } while (exception.retry);
3881         return err;
3882 }
3883
3884 static int
3885 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3886 {
3887         struct nfs_client *clp = server->nfs_client;
3888
3889         if (task->tk_status >= 0)
3890                 return 0;
3891         switch(task->tk_status) {
3892                 case -NFS4ERR_DELEG_REVOKED:
3893                 case -NFS4ERR_ADMIN_REVOKED:
3894                 case -NFS4ERR_BAD_STATEID:
3895                         if (state == NULL)
3896                                 break;
3897                         nfs_remove_bad_delegation(state->inode);
3898                 case -NFS4ERR_OPENMODE:
3899                         if (state == NULL)
3900                                 break;
3901                         nfs4_schedule_stateid_recovery(server, state);
3902                         goto wait_on_recovery;
3903                 case -NFS4ERR_EXPIRED:
3904                         if (state != NULL)
3905                                 nfs4_schedule_stateid_recovery(server, state);
3906                 case -NFS4ERR_STALE_STATEID:
3907                 case -NFS4ERR_STALE_CLIENTID:
3908                         nfs4_schedule_lease_recovery(clp);
3909                         goto wait_on_recovery;
3910 #if defined(CONFIG_NFS_V4_1)
3911                 case -NFS4ERR_BADSESSION:
3912                 case -NFS4ERR_BADSLOT:
3913                 case -NFS4ERR_BAD_HIGH_SLOT:
3914                 case -NFS4ERR_DEADSESSION:
3915                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3916                 case -NFS4ERR_SEQ_FALSE_RETRY:
3917                 case -NFS4ERR_SEQ_MISORDERED:
3918                         dprintk("%s ERROR %d, Reset session\n", __func__,
3919                                 task->tk_status);
3920                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3921                         task->tk_status = 0;
3922                         return -EAGAIN;
3923 #endif /* CONFIG_NFS_V4_1 */
3924                 case -NFS4ERR_DELAY:
3925                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3926                 case -NFS4ERR_GRACE:
3927                 case -EKEYEXPIRED:
3928                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3929                         task->tk_status = 0;
3930                         return -EAGAIN;
3931                 case -NFS4ERR_RETRY_UNCACHED_REP:
3932                 case -NFS4ERR_OLD_STATEID:
3933                         task->tk_status = 0;
3934                         return -EAGAIN;
3935         }
3936         task->tk_status = nfs4_map_errors(task->tk_status);
3937         return 0;
3938 wait_on_recovery:
3939         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3940         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3941                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3942         task->tk_status = 0;
3943         return -EAGAIN;
3944 }
3945
3946 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3947                                     nfs4_verifier *bootverf)
3948 {
3949         __be32 verf[2];
3950
3951         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3952                 /* An impossible timestamp guarantees this value
3953                  * will never match a generated boot time. */
3954                 verf[0] = 0;
3955                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3956         } else {
3957                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3958                 verf[0] = (__be32)nn->boot_time.tv_sec;
3959                 verf[1] = (__be32)nn->boot_time.tv_nsec;
3960         }
3961         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3962 }
3963
3964 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3965                 unsigned short port, struct rpc_cred *cred,
3966                 struct nfs4_setclientid_res *res)
3967 {
3968         nfs4_verifier sc_verifier;
3969         struct nfs4_setclientid setclientid = {
3970                 .sc_verifier = &sc_verifier,
3971                 .sc_prog = program,
3972                 .sc_cb_ident = clp->cl_cb_ident,
3973         };
3974         struct rpc_message msg = {
3975                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3976                 .rpc_argp = &setclientid,
3977                 .rpc_resp = res,
3978                 .rpc_cred = cred,
3979         };
3980         int loop = 0;
3981         int status;
3982
3983         nfs4_init_boot_verifier(clp, &sc_verifier);
3984
3985         for(;;) {
3986                 rcu_read_lock();
3987                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3988                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3989                                 clp->cl_ipaddr,
3990                                 rpc_peeraddr2str(clp->cl_rpcclient,
3991                                                         RPC_DISPLAY_ADDR),
3992                                 rpc_peeraddr2str(clp->cl_rpcclient,
3993                                                         RPC_DISPLAY_PROTO),
3994                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3995                                 clp->cl_id_uniquifier);
3996                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3997                                 sizeof(setclientid.sc_netid),
3998                                 rpc_peeraddr2str(clp->cl_rpcclient,
3999                                                         RPC_DISPLAY_NETID));
4000                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4001                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4002                                 clp->cl_ipaddr, port >> 8, port & 255);
4003                 rcu_read_unlock();
4004
4005                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4006                 if (status != -NFS4ERR_CLID_INUSE)
4007                         break;
4008                 if (loop != 0) {
4009                         ++clp->cl_id_uniquifier;
4010                         break;
4011                 }
4012                 ++loop;
4013                 ssleep(clp->cl_lease_time / HZ + 1);
4014         }
4015         return status;
4016 }
4017
4018 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4019                 struct nfs4_setclientid_res *arg,
4020                 struct rpc_cred *cred)
4021 {
4022         struct nfs_fsinfo fsinfo;
4023         struct rpc_message msg = {
4024                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4025                 .rpc_argp = arg,
4026                 .rpc_resp = &fsinfo,
4027                 .rpc_cred = cred,
4028         };
4029         unsigned long now;
4030         int status;
4031
4032         now = jiffies;
4033         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4034         if (status == 0) {
4035                 spin_lock(&clp->cl_lock);
4036                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4037                 clp->cl_last_renewal = now;
4038                 spin_unlock(&clp->cl_lock);
4039         }
4040         return status;
4041 }
4042
4043 struct nfs4_delegreturndata {
4044         struct nfs4_delegreturnargs args;
4045         struct nfs4_delegreturnres res;
4046         struct nfs_fh fh;
4047         nfs4_stateid stateid;
4048         unsigned long timestamp;
4049         struct nfs_fattr fattr;
4050         int rpc_status;
4051 };
4052
4053 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4054 {
4055         struct nfs4_delegreturndata *data = calldata;
4056
4057         if (!nfs4_sequence_done(task, &data->res.seq_res))
4058                 return;
4059
4060         switch (task->tk_status) {
4061         case -NFS4ERR_STALE_STATEID:
4062         case -NFS4ERR_EXPIRED:
4063         case 0:
4064                 renew_lease(data->res.server, data->timestamp);
4065                 break;
4066         default:
4067                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4068                                 -EAGAIN) {
4069                         rpc_restart_call_prepare(task);
4070                         return;
4071                 }
4072         }
4073         data->rpc_status = task->tk_status;
4074 }
4075
4076 static void nfs4_delegreturn_release(void *calldata)
4077 {
4078         kfree(calldata);
4079 }
4080
4081 #if defined(CONFIG_NFS_V4_1)
4082 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4083 {
4084         struct nfs4_delegreturndata *d_data;
4085
4086         d_data = (struct nfs4_delegreturndata *)data;
4087
4088         if (nfs4_setup_sequence(d_data->res.server,
4089                                 &d_data->args.seq_args,
4090                                 &d_data->res.seq_res, task))
4091                 return;
4092         rpc_call_start(task);
4093 }
4094 #endif /* CONFIG_NFS_V4_1 */
4095
4096 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4097 #if defined(CONFIG_NFS_V4_1)
4098         .rpc_call_prepare = nfs4_delegreturn_prepare,
4099 #endif /* CONFIG_NFS_V4_1 */
4100         .rpc_call_done = nfs4_delegreturn_done,
4101         .rpc_release = nfs4_delegreturn_release,
4102 };
4103
4104 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4105 {
4106         struct nfs4_delegreturndata *data;
4107         struct nfs_server *server = NFS_SERVER(inode);
4108         struct rpc_task *task;
4109         struct rpc_message msg = {
4110                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4111                 .rpc_cred = cred,
4112         };
4113         struct rpc_task_setup task_setup_data = {
4114                 .rpc_client = server->client,
4115                 .rpc_message = &msg,
4116                 .callback_ops = &nfs4_delegreturn_ops,
4117                 .flags = RPC_TASK_ASYNC,
4118         };
4119         int status = 0;
4120
4121         data = kzalloc(sizeof(*data), GFP_NOFS);
4122         if (data == NULL)
4123                 return -ENOMEM;
4124         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4125         data->args.fhandle = &data->fh;
4126         data->args.stateid = &data->stateid;
4127         data->args.bitmask = server->cache_consistency_bitmask;
4128         nfs_copy_fh(&data->fh, NFS_FH(inode));
4129         nfs4_stateid_copy(&data->stateid, stateid);
4130         data->res.fattr = &data->fattr;
4131         data->res.server = server;
4132         nfs_fattr_init(data->res.fattr);
4133         data->timestamp = jiffies;
4134         data->rpc_status = 0;
4135
4136         task_setup_data.callback_data = data;
4137         msg.rpc_argp = &data->args;
4138         msg.rpc_resp = &data->res;
4139         task = rpc_run_task(&task_setup_data);
4140         if (IS_ERR(task))
4141                 return PTR_ERR(task);
4142         if (!issync)
4143                 goto out;
4144         status = nfs4_wait_for_completion_rpc_task(task);
4145         if (status != 0)
4146                 goto out;
4147         status = data->rpc_status;
4148         if (status == 0)
4149                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4150         else
4151                 nfs_refresh_inode(inode, &data->fattr);
4152 out:
4153         rpc_put_task(task);
4154         return status;
4155 }
4156
4157 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4158 {
4159         struct nfs_server *server = NFS_SERVER(inode);
4160         struct nfs4_exception exception = { };
4161         int err;
4162         do {
4163                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4164                 switch (err) {
4165                         case -NFS4ERR_STALE_STATEID:
4166                         case -NFS4ERR_EXPIRED:
4167                         case 0:
4168                                 return 0;
4169                 }
4170                 err = nfs4_handle_exception(server, err, &exception);
4171         } while (exception.retry);
4172         return err;
4173 }
4174
4175 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4176 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4177
4178 /*
4179  * sleep, with exponential backoff, and retry the LOCK operation.
4180  */
4181 static unsigned long
4182 nfs4_set_lock_task_retry(unsigned long timeout)
4183 {
4184         freezable_schedule_timeout_killable(timeout);
4185         timeout <<= 1;
4186         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4187                 return NFS4_LOCK_MAXTIMEOUT;
4188         return timeout;
4189 }
4190
4191 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4192 {
4193         struct inode *inode = state->inode;
4194         struct nfs_server *server = NFS_SERVER(inode);
4195         struct nfs_client *clp = server->nfs_client;
4196         struct nfs_lockt_args arg = {
4197                 .fh = NFS_FH(inode),
4198                 .fl = request,
4199         };
4200         struct nfs_lockt_res res = {
4201                 .denied = request,
4202         };
4203         struct rpc_message msg = {
4204                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4205                 .rpc_argp       = &arg,
4206                 .rpc_resp       = &res,
4207                 .rpc_cred       = state->owner->so_cred,
4208         };
4209         struct nfs4_lock_state *lsp;
4210         int status;
4211
4212         arg.lock_owner.clientid = clp->cl_clientid;
4213         status = nfs4_set_lock_state(state, request);
4214         if (status != 0)
4215                 goto out;
4216         lsp = request->fl_u.nfs4_fl.owner;
4217         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4218         arg.lock_owner.s_dev = server->s_dev;
4219         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4220         switch (status) {
4221                 case 0:
4222                         request->fl_type = F_UNLCK;
4223                         break;
4224                 case -NFS4ERR_DENIED:
4225                         status = 0;
4226         }
4227         request->fl_ops->fl_release_private(request);
4228 out:
4229         return status;
4230 }
4231
4232 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4233 {
4234         struct nfs4_exception exception = { };
4235         int err;
4236
4237         do {
4238                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4239                                 _nfs4_proc_getlk(state, cmd, request),
4240                                 &exception);
4241         } while (exception.retry);
4242         return err;
4243 }
4244
4245 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4246 {
4247         int res = 0;
4248         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4249                 case FL_POSIX:
4250                         res = posix_lock_file_wait(file, fl);
4251                         break;
4252                 case FL_FLOCK:
4253                         res = flock_lock_file_wait(file, fl);
4254                         break;
4255                 default:
4256                         BUG();
4257         }
4258         return res;
4259 }
4260
4261 struct nfs4_unlockdata {
4262         struct nfs_locku_args arg;
4263         struct nfs_locku_res res;
4264         struct nfs4_lock_state *lsp;
4265         struct nfs_open_context *ctx;
4266         struct file_lock fl;
4267         const struct nfs_server *server;
4268         unsigned long timestamp;
4269 };
4270
4271 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4272                 struct nfs_open_context *ctx,
4273                 struct nfs4_lock_state *lsp,
4274                 struct nfs_seqid *seqid)
4275 {
4276         struct nfs4_unlockdata *p;
4277         struct inode *inode = lsp->ls_state->inode;
4278
4279         p = kzalloc(sizeof(*p), GFP_NOFS);
4280         if (p == NULL)
4281                 return NULL;
4282         p->arg.fh = NFS_FH(inode);
4283         p->arg.fl = &p->fl;
4284         p->arg.seqid = seqid;
4285         p->res.seqid = seqid;
4286         p->arg.stateid = &lsp->ls_stateid;
4287         p->lsp = lsp;
4288         atomic_inc(&lsp->ls_count);
4289         /* Ensure we don't close file until we're done freeing locks! */
4290         p->ctx = get_nfs_open_context(ctx);
4291         memcpy(&p->fl, fl, sizeof(p->fl));
4292         p->server = NFS_SERVER(inode);
4293         return p;
4294 }
4295
4296 static void nfs4_locku_release_calldata(void *data)
4297 {
4298         struct nfs4_unlockdata *calldata = data;
4299         nfs_free_seqid(calldata->arg.seqid);
4300         nfs4_put_lock_state(calldata->lsp);
4301         put_nfs_open_context(calldata->ctx);
4302         kfree(calldata);
4303 }
4304
4305 static void nfs4_locku_done(struct rpc_task *task, void *data)
4306 {
4307         struct nfs4_unlockdata *calldata = data;
4308
4309         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4310                 return;
4311         switch (task->tk_status) {
4312                 case 0:
4313                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4314                                         &calldata->res.stateid);
4315                         renew_lease(calldata->server, calldata->timestamp);
4316                         break;
4317                 case -NFS4ERR_BAD_STATEID:
4318                 case -NFS4ERR_OLD_STATEID:
4319                 case -NFS4ERR_STALE_STATEID:
4320                 case -NFS4ERR_EXPIRED:
4321                         break;
4322                 default:
4323                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4324                                 rpc_restart_call_prepare(task);
4325         }
4326 }
4327
4328 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4329 {
4330         struct nfs4_unlockdata *calldata = data;
4331
4332         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4333                 return;
4334         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4335                 /* Note: exit _without_ running nfs4_locku_done */
4336                 task->tk_action = NULL;
4337                 return;
4338         }
4339         calldata->timestamp = jiffies;
4340         if (nfs4_setup_sequence(calldata->server,
4341                                 &calldata->arg.seq_args,
4342                                 &calldata->res.seq_res, task))
4343                 return;
4344         rpc_call_start(task);
4345 }
4346
4347 static const struct rpc_call_ops nfs4_locku_ops = {
4348         .rpc_call_prepare = nfs4_locku_prepare,
4349         .rpc_call_done = nfs4_locku_done,
4350         .rpc_release = nfs4_locku_release_calldata,
4351 };
4352
4353 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4354                 struct nfs_open_context *ctx,
4355                 struct nfs4_lock_state *lsp,
4356                 struct nfs_seqid *seqid)
4357 {
4358         struct nfs4_unlockdata *data;
4359         struct rpc_message msg = {
4360                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4361                 .rpc_cred = ctx->cred,
4362         };
4363         struct rpc_task_setup task_setup_data = {
4364                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4365                 .rpc_message = &msg,
4366                 .callback_ops = &nfs4_locku_ops,
4367                 .workqueue = nfsiod_workqueue,
4368                 .flags = RPC_TASK_ASYNC,
4369         };
4370
4371         /* Ensure this is an unlock - when canceling a lock, the
4372          * canceled lock is passed in, and it won't be an unlock.
4373          */
4374         fl->fl_type = F_UNLCK;
4375
4376         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4377         if (data == NULL) {
4378                 nfs_free_seqid(seqid);
4379                 return ERR_PTR(-ENOMEM);
4380         }
4381
4382         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4383         msg.rpc_argp = &data->arg;
4384         msg.rpc_resp = &data->res;
4385         task_setup_data.callback_data = data;
4386         return rpc_run_task(&task_setup_data);
4387 }
4388
4389 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4390 {
4391         struct nfs_inode *nfsi = NFS_I(state->inode);
4392         struct nfs_seqid *seqid;
4393         struct nfs4_lock_state *lsp;
4394         struct rpc_task *task;
4395         int status = 0;
4396         unsigned char fl_flags = request->fl_flags;
4397
4398         status = nfs4_set_lock_state(state, request);
4399         /* Unlock _before_ we do the RPC call */
4400         request->fl_flags |= FL_EXISTS;
4401         down_read(&nfsi->rwsem);
4402         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4403                 up_read(&nfsi->rwsem);
4404                 goto out;
4405         }
4406         up_read(&nfsi->rwsem);
4407         if (status != 0)
4408                 goto out;
4409         /* Is this a delegated lock? */
4410         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4411                 goto out;
4412         lsp = request->fl_u.nfs4_fl.owner;
4413         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4414         status = -ENOMEM;
4415         if (seqid == NULL)
4416                 goto out;
4417         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4418         status = PTR_ERR(task);
4419         if (IS_ERR(task))
4420                 goto out;
4421         status = nfs4_wait_for_completion_rpc_task(task);
4422         rpc_put_task(task);
4423 out:
4424         request->fl_flags = fl_flags;
4425         return status;
4426 }
4427
4428 struct nfs4_lockdata {
4429         struct nfs_lock_args arg;
4430         struct nfs_lock_res res;
4431         struct nfs4_lock_state *lsp;
4432         struct nfs_open_context *ctx;
4433         struct file_lock fl;
4434         unsigned long timestamp;
4435         int rpc_status;
4436         int cancelled;
4437         struct nfs_server *server;
4438 };
4439
4440 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4441                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4442                 gfp_t gfp_mask)
4443 {
4444         struct nfs4_lockdata *p;
4445         struct inode *inode = lsp->ls_state->inode;
4446         struct nfs_server *server = NFS_SERVER(inode);
4447
4448         p = kzalloc(sizeof(*p), gfp_mask);
4449         if (p == NULL)
4450                 return NULL;
4451
4452         p->arg.fh = NFS_FH(inode);
4453         p->arg.fl = &p->fl;
4454         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4455         if (p->arg.open_seqid == NULL)
4456                 goto out_free;
4457         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4458         if (p->arg.lock_seqid == NULL)
4459                 goto out_free_seqid;
4460         p->arg.lock_stateid = &lsp->ls_stateid;
4461         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4462         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4463         p->arg.lock_owner.s_dev = server->s_dev;
4464         p->res.lock_seqid = p->arg.lock_seqid;
4465         p->lsp = lsp;
4466         p->server = server;
4467         atomic_inc(&lsp->ls_count);
4468         p->ctx = get_nfs_open_context(ctx);
4469         memcpy(&p->fl, fl, sizeof(p->fl));
4470         return p;
4471 out_free_seqid:
4472         nfs_free_seqid(p->arg.open_seqid);
4473 out_free:
4474         kfree(p);
4475         return NULL;
4476 }
4477
4478 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4479 {
4480         struct nfs4_lockdata *data = calldata;
4481         struct nfs4_state *state = data->lsp->ls_state;
4482
4483         dprintk("%s: begin!\n", __func__);
4484         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4485                 return;
4486         /* Do we need to do an open_to_lock_owner? */
4487         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4488                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4489                         return;
4490                 data->arg.open_stateid = &state->stateid;
4491                 data->arg.new_lock_owner = 1;
4492                 data->res.open_seqid = data->arg.open_seqid;
4493         } else
4494                 data->arg.new_lock_owner = 0;
4495         data->timestamp = jiffies;
4496         if (nfs4_setup_sequence(data->server,
4497                                 &data->arg.seq_args,
4498                                 &data->res.seq_res, task))
4499                 return;
4500         rpc_call_start(task);
4501         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4502 }
4503
4504 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4505 {
4506         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4507         nfs4_lock_prepare(task, calldata);
4508 }
4509
4510 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4511 {
4512         struct nfs4_lockdata *data = calldata;
4513
4514         dprintk("%s: begin!\n", __func__);
4515
4516         if (!nfs4_sequence_done(task, &data->res.seq_res))
4517                 return;
4518
4519         data->rpc_status = task->tk_status;
4520         if (data->arg.new_lock_owner != 0) {
4521                 if (data->rpc_status == 0)
4522                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4523                 else
4524                         goto out;
4525         }
4526         if (data->rpc_status == 0) {
4527                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4528                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4529                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4530         }
4531 out:
4532         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4533 }
4534
4535 static void nfs4_lock_release(void *calldata)
4536 {
4537         struct nfs4_lockdata *data = calldata;
4538
4539         dprintk("%s: begin!\n", __func__);
4540         nfs_free_seqid(data->arg.open_seqid);
4541         if (data->cancelled != 0) {
4542                 struct rpc_task *task;
4543                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4544                                 data->arg.lock_seqid);
4545                 if (!IS_ERR(task))
4546                         rpc_put_task_async(task);
4547                 dprintk("%s: cancelling lock!\n", __func__);
4548         } else
4549                 nfs_free_seqid(data->arg.lock_seqid);
4550         nfs4_put_lock_state(data->lsp);
4551         put_nfs_open_context(data->ctx);
4552         kfree(data);
4553         dprintk("%s: done!\n", __func__);
4554 }
4555
4556 static const struct rpc_call_ops nfs4_lock_ops = {
4557         .rpc_call_prepare = nfs4_lock_prepare,
4558         .rpc_call_done = nfs4_lock_done,
4559         .rpc_release = nfs4_lock_release,
4560 };
4561
4562 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4563         .rpc_call_prepare = nfs4_recover_lock_prepare,
4564         .rpc_call_done = nfs4_lock_done,
4565         .rpc_release = nfs4_lock_release,
4566 };
4567
4568 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4569 {
4570         switch (error) {
4571         case -NFS4ERR_ADMIN_REVOKED:
4572         case -NFS4ERR_BAD_STATEID:
4573                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4574                 if (new_lock_owner != 0 ||
4575                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4576                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4577                 break;
4578         case -NFS4ERR_STALE_STATEID:
4579                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4580         case -NFS4ERR_EXPIRED:
4581                 nfs4_schedule_lease_recovery(server->nfs_client);
4582         };
4583 }
4584
4585 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4586 {
4587         struct nfs4_lockdata *data;
4588         struct rpc_task *task;
4589         struct rpc_message msg = {
4590                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4591                 .rpc_cred = state->owner->so_cred,
4592         };
4593         struct rpc_task_setup task_setup_data = {
4594                 .rpc_client = NFS_CLIENT(state->inode),
4595                 .rpc_message = &msg,
4596                 .callback_ops = &nfs4_lock_ops,
4597                 .workqueue = nfsiod_workqueue,
4598                 .flags = RPC_TASK_ASYNC,
4599         };
4600         int ret;
4601
4602         dprintk("%s: begin!\n", __func__);
4603         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4604                         fl->fl_u.nfs4_fl.owner,
4605                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4606         if (data == NULL)
4607                 return -ENOMEM;
4608         if (IS_SETLKW(cmd))
4609                 data->arg.block = 1;
4610         if (recovery_type > NFS_LOCK_NEW) {
4611                 if (recovery_type == NFS_LOCK_RECLAIM)
4612                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4613                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4614         }
4615         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4616         msg.rpc_argp = &data->arg;
4617         msg.rpc_resp = &data->res;
4618         task_setup_data.callback_data = data;
4619         task = rpc_run_task(&task_setup_data);
4620         if (IS_ERR(task))
4621                 return PTR_ERR(task);
4622         ret = nfs4_wait_for_completion_rpc_task(task);
4623         if (ret == 0) {
4624                 ret = data->rpc_status;
4625                 if (ret)
4626                         nfs4_handle_setlk_error(data->server, data->lsp,
4627                                         data->arg.new_lock_owner, ret);
4628         } else
4629                 data->cancelled = 1;
4630         rpc_put_task(task);
4631         dprintk("%s: done, ret = %d!\n", __func__, ret);
4632         return ret;
4633 }
4634
4635 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4636 {
4637         struct nfs_server *server = NFS_SERVER(state->inode);
4638         struct nfs4_exception exception = {
4639                 .inode = state->inode,
4640         };
4641         int err;
4642
4643         do {
4644                 /* Cache the lock if possible... */
4645                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4646                         return 0;
4647                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4648                 if (err != -NFS4ERR_DELAY)
4649                         break;
4650                 nfs4_handle_exception(server, err, &exception);
4651         } while (exception.retry);
4652         return err;
4653 }
4654
4655 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4656 {
4657         struct nfs_server *server = NFS_SERVER(state->inode);
4658         struct nfs4_exception exception = {
4659                 .inode = state->inode,
4660         };
4661         int err;
4662
4663         err = nfs4_set_lock_state(state, request);
4664         if (err != 0)
4665                 return err;
4666         do {
4667                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4668                         return 0;
4669                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4670                 switch (err) {
4671                 default:
4672                         goto out;
4673                 case -NFS4ERR_GRACE:
4674                 case -NFS4ERR_DELAY:
4675                         nfs4_handle_exception(server, err, &exception);
4676                         err = 0;
4677                 }
4678         } while (exception.retry);
4679 out:
4680         return err;
4681 }
4682
4683 #if defined(CONFIG_NFS_V4_1)
4684 static int nfs41_check_expired_locks(struct nfs4_state *state)
4685 {
4686         int status, ret = NFS_OK;
4687         struct nfs4_lock_state *lsp;
4688         struct nfs_server *server = NFS_SERVER(state->inode);
4689
4690         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4691                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4692                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4693                         if (status != NFS_OK) {
4694                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4695                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4696                                 ret = status;
4697                         }
4698                 }
4699         };
4700
4701         return ret;
4702 }
4703
4704 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4705 {
4706         int status = NFS_OK;
4707
4708         if (test_bit(LK_STATE_IN_USE, &state->flags))
4709                 status = nfs41_check_expired_locks(state);
4710         if (status == NFS_OK)
4711                 return status;
4712         return nfs4_lock_expired(state, request);
4713 }
4714 #endif
4715
4716 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4717 {
4718         struct nfs_inode *nfsi = NFS_I(state->inode);
4719         unsigned char fl_flags = request->fl_flags;
4720         int status = -ENOLCK;
4721
4722         if ((fl_flags & FL_POSIX) &&
4723                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4724                 goto out;
4725         /* Is this a delegated open? */
4726         status = nfs4_set_lock_state(state, request);
4727         if (status != 0)
4728                 goto out;
4729         request->fl_flags |= FL_ACCESS;
4730         status = do_vfs_lock(request->fl_file, request);
4731         if (status < 0)
4732                 goto out;
4733         down_read(&nfsi->rwsem);
4734         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4735                 /* Yes: cache locks! */
4736                 /* ...but avoid races with delegation recall... */
4737                 request->fl_flags = fl_flags & ~FL_SLEEP;
4738                 status = do_vfs_lock(request->fl_file, request);
4739                 goto out_unlock;
4740         }
4741         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4742         if (status != 0)
4743                 goto out_unlock;
4744         /* Note: we always want to sleep here! */
4745         request->fl_flags = fl_flags | FL_SLEEP;
4746         if (do_vfs_lock(request->fl_file, request) < 0)
4747                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4748                         "manager!\n", __func__);
4749 out_unlock:
4750         up_read(&nfsi->rwsem);
4751 out:
4752         request->fl_flags = fl_flags;
4753         return status;
4754 }
4755
4756 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4757 {
4758         struct nfs4_exception exception = {
4759                 .state = state,
4760                 .inode = state->inode,
4761         };
4762         int err;
4763
4764         do {
4765                 err = _nfs4_proc_setlk(state, cmd, request);
4766                 if (err == -NFS4ERR_DENIED)
4767                         err = -EAGAIN;
4768                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4769                                 err, &exception);
4770         } while (exception.retry);
4771         return err;
4772 }
4773
4774 static int
4775 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4776 {
4777         struct nfs_open_context *ctx;
4778         struct nfs4_state *state;
4779         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4780         int status;
4781
4782         /* verify open state */
4783         ctx = nfs_file_open_context(filp);
4784         state = ctx->state;
4785
4786         if (request->fl_start < 0 || request->fl_end < 0)
4787                 return -EINVAL;
4788
4789         if (IS_GETLK(cmd)) {
4790                 if (state != NULL)
4791                         return nfs4_proc_getlk(state, F_GETLK, request);
4792                 return 0;
4793         }
4794
4795         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4796                 return -EINVAL;
4797
4798         if (request->fl_type == F_UNLCK) {
4799                 if (state != NULL)
4800                         return nfs4_proc_unlck(state, cmd, request);
4801                 return 0;
4802         }
4803
4804         if (state == NULL)
4805                 return -ENOLCK;
4806         /*
4807          * Don't rely on the VFS having checked the file open mode,
4808          * since it won't do this for flock() locks.
4809          */
4810         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4811         case F_RDLCK:
4812                 if (!(filp->f_mode & FMODE_READ))
4813                         return -EBADF;
4814                 break;
4815         case F_WRLCK:
4816                 if (!(filp->f_mode & FMODE_WRITE))
4817                         return -EBADF;
4818         }
4819
4820         do {
4821                 status = nfs4_proc_setlk(state, cmd, request);
4822                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4823                         break;
4824                 timeout = nfs4_set_lock_task_retry(timeout);
4825                 status = -ERESTARTSYS;
4826                 if (signalled())
4827                         break;
4828         } while(status < 0);
4829         return status;
4830 }
4831
4832 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4833 {
4834         struct nfs_server *server = NFS_SERVER(state->inode);
4835         struct nfs4_exception exception = { };
4836         int err;
4837
4838         err = nfs4_set_lock_state(state, fl);
4839         if (err != 0)
4840                 goto out;
4841         do {
4842                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4843                 switch (err) {
4844                         default:
4845                                 printk(KERN_ERR "NFS: %s: unhandled error "
4846                                         "%d.\n", __func__, err);
4847                         case 0:
4848                         case -ESTALE:
4849                                 goto out;
4850                         case -NFS4ERR_EXPIRED:
4851                                 nfs4_schedule_stateid_recovery(server, state);
4852                         case -NFS4ERR_STALE_CLIENTID:
4853                         case -NFS4ERR_STALE_STATEID:
4854                                 nfs4_schedule_lease_recovery(server->nfs_client);
4855                                 goto out;
4856                         case -NFS4ERR_BADSESSION:
4857                         case -NFS4ERR_BADSLOT:
4858                         case -NFS4ERR_BAD_HIGH_SLOT:
4859                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4860                         case -NFS4ERR_DEADSESSION:
4861                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4862                                 goto out;
4863                         case -ERESTARTSYS:
4864                                 /*
4865                                  * The show must go on: exit, but mark the
4866                                  * stateid as needing recovery.
4867                                  */
4868                         case -NFS4ERR_DELEG_REVOKED:
4869                         case -NFS4ERR_ADMIN_REVOKED:
4870                         case -NFS4ERR_BAD_STATEID:
4871                         case -NFS4ERR_OPENMODE:
4872                                 nfs4_schedule_stateid_recovery(server, state);
4873                                 err = 0;
4874                                 goto out;
4875                         case -EKEYEXPIRED:
4876                                 /*
4877                                  * User RPCSEC_GSS context has expired.
4878                                  * We cannot recover this stateid now, so
4879                                  * skip it and allow recovery thread to
4880                                  * proceed.
4881                                  */
4882                                 err = 0;
4883                                 goto out;
4884                         case -ENOMEM:
4885                         case -NFS4ERR_DENIED:
4886                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4887                                 err = 0;
4888                                 goto out;
4889                         case -NFS4ERR_DELAY:
4890                                 break;
4891                 }
4892                 err = nfs4_handle_exception(server, err, &exception);
4893         } while (exception.retry);
4894 out:
4895         return err;
4896 }
4897
4898 struct nfs_release_lockowner_data {
4899         struct nfs4_lock_state *lsp;
4900         struct nfs_server *server;
4901         struct nfs_release_lockowner_args args;
4902 };
4903
4904 static void nfs4_release_lockowner_release(void *calldata)
4905 {
4906         struct nfs_release_lockowner_data *data = calldata;
4907         nfs4_free_lock_state(data->server, data->lsp);
4908         kfree(calldata);
4909 }
4910
4911 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4912         .rpc_release = nfs4_release_lockowner_release,
4913 };
4914
4915 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4916 {
4917         struct nfs_server *server = lsp->ls_state->owner->so_server;
4918         struct nfs_release_lockowner_data *data;
4919         struct rpc_message msg = {
4920                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4921         };
4922
4923         if (server->nfs_client->cl_mvops->minor_version != 0)
4924                 return -EINVAL;
4925         data = kmalloc(sizeof(*data), GFP_NOFS);
4926         if (!data)
4927                 return -ENOMEM;
4928         data->lsp = lsp;
4929         data->server = server;
4930         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4931         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4932         data->args.lock_owner.s_dev = server->s_dev;
4933         msg.rpc_argp = &data->args;
4934         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4935         return 0;
4936 }
4937
4938 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4939
4940 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4941                                    const void *buf, size_t buflen,
4942                                    int flags, int type)
4943 {
4944         if (strcmp(key, "") != 0)
4945                 return -EINVAL;
4946
4947         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4948 }
4949
4950 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4951                                    void *buf, size_t buflen, int type)
4952 {
4953         if (strcmp(key, "") != 0)
4954                 return -EINVAL;
4955
4956         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4957 }
4958
4959 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4960                                        size_t list_len, const char *name,
4961                                        size_t name_len, int type)
4962 {
4963         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4964
4965         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4966                 return 0;
4967
4968         if (list && len <= list_len)
4969                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4970         return len;
4971 }
4972
4973 /*
4974  * nfs_fhget will use either the mounted_on_fileid or the fileid
4975  */
4976 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4977 {
4978         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4979                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4980               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4981               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4982                 return;
4983
4984         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4985                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4986         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4987         fattr->nlink = 2;
4988 }
4989
4990 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4991                                    const struct qstr *name,
4992                                    struct nfs4_fs_locations *fs_locations,
4993                                    struct page *page)
4994 {
4995         struct nfs_server *server = NFS_SERVER(dir);
4996         u32 bitmask[2] = {
4997                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4998         };
4999         struct nfs4_fs_locations_arg args = {
5000                 .dir_fh = NFS_FH(dir),
5001                 .name = name,
5002                 .page = page,
5003                 .bitmask = bitmask,
5004         };
5005         struct nfs4_fs_locations_res res = {
5006                 .fs_locations = fs_locations,
5007         };
5008         struct rpc_message msg = {
5009                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5010                 .rpc_argp = &args,
5011                 .rpc_resp = &res,
5012         };
5013         int status;
5014
5015         dprintk("%s: start\n", __func__);
5016
5017         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5018          * is not supported */
5019         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5020                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5021         else
5022                 bitmask[0] |= FATTR4_WORD0_FILEID;
5023
5024         nfs_fattr_init(&fs_locations->fattr);
5025         fs_locations->server = server;
5026         fs_locations->nlocations = 0;
5027         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5028         dprintk("%s: returned status = %d\n", __func__, status);
5029         return status;
5030 }
5031
5032 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5033                            const struct qstr *name,
5034                            struct nfs4_fs_locations *fs_locations,
5035                            struct page *page)
5036 {
5037         struct nfs4_exception exception = { };
5038         int err;
5039         do {
5040                 err = nfs4_handle_exception(NFS_SERVER(dir),
5041                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5042                                 &exception);
5043         } while (exception.retry);
5044         return err;
5045 }
5046
5047 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5048 {
5049         int status;
5050         struct nfs4_secinfo_arg args = {
5051                 .dir_fh = NFS_FH(dir),
5052                 .name   = name,
5053         };
5054         struct nfs4_secinfo_res res = {
5055                 .flavors     = flavors,
5056         };
5057         struct rpc_message msg = {
5058                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5059                 .rpc_argp = &args,
5060                 .rpc_resp = &res,
5061         };
5062
5063         dprintk("NFS call  secinfo %s\n", name->name);
5064         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5065         dprintk("NFS reply  secinfo: %d\n", status);
5066         return status;
5067 }
5068
5069 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5070                       struct nfs4_secinfo_flavors *flavors)
5071 {
5072         struct nfs4_exception exception = { };
5073         int err;
5074         do {
5075                 err = nfs4_handle_exception(NFS_SERVER(dir),
5076                                 _nfs4_proc_secinfo(dir, name, flavors),
5077                                 &exception);
5078         } while (exception.retry);
5079         return err;
5080 }
5081
5082 #ifdef CONFIG_NFS_V4_1
5083 /*
5084  * Check the exchange flags returned by the server for invalid flags, having
5085  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5086  * DS flags set.
5087  */
5088 static int nfs4_check_cl_exchange_flags(u32 flags)
5089 {
5090         if (flags & ~EXCHGID4_FLAG_MASK_R)
5091                 goto out_inval;
5092         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5093             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5094                 goto out_inval;
5095         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5096                 goto out_inval;
5097         return NFS_OK;
5098 out_inval:
5099         return -NFS4ERR_INVAL;
5100 }
5101
5102 static bool
5103 nfs41_same_server_scope(struct nfs41_server_scope *a,
5104                         struct nfs41_server_scope *b)
5105 {
5106         if (a->server_scope_sz == b->server_scope_sz &&
5107             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5108                 return true;
5109
5110         return false;
5111 }
5112
5113 /*
5114  * nfs4_proc_bind_conn_to_session()
5115  *
5116  * The 4.1 client currently uses the same TCP connection for the
5117  * fore and backchannel.
5118  */
5119 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5120 {
5121         int status;
5122         struct nfs41_bind_conn_to_session_res res;
5123         struct rpc_message msg = {
5124                 .rpc_proc =
5125                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5126                 .rpc_argp = clp,
5127                 .rpc_resp = &res,
5128                 .rpc_cred = cred,
5129         };
5130
5131         dprintk("--> %s\n", __func__);
5132         BUG_ON(clp == NULL);
5133
5134         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5135         if (unlikely(res.session == NULL)) {
5136                 status = -ENOMEM;
5137                 goto out;
5138         }
5139
5140         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5141         if (status == 0) {
5142                 if (memcmp(res.session->sess_id.data,
5143                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5144                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5145                         status = -EIO;
5146                         goto out_session;
5147                 }
5148                 if (res.dir != NFS4_CDFS4_BOTH) {
5149                         dprintk("NFS: %s: Unexpected direction from server\n",
5150                                 __func__);
5151                         status = -EIO;
5152                         goto out_session;
5153                 }
5154                 if (res.use_conn_in_rdma_mode) {
5155                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5156                                 __func__);
5157                         status = -EIO;
5158                         goto out_session;
5159                 }
5160         }
5161 out_session:
5162         kfree(res.session);
5163 out:
5164         dprintk("<-- %s status= %d\n", __func__, status);
5165         return status;
5166 }
5167
5168 /*
5169  * nfs4_proc_exchange_id()
5170  *
5171  * Since the clientid has expired, all compounds using sessions
5172  * associated with the stale clientid will be returning
5173  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5174  * be in some phase of session reset.
5175  */
5176 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5177 {
5178         nfs4_verifier verifier;
5179         struct nfs41_exchange_id_args args = {
5180                 .verifier = &verifier,
5181                 .client = clp,
5182                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5183         };
5184         struct nfs41_exchange_id_res res = {
5185                 0
5186         };
5187         int status;
5188         struct rpc_message msg = {
5189                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5190                 .rpc_argp = &args,
5191                 .rpc_resp = &res,
5192                 .rpc_cred = cred,
5193         };
5194
5195         dprintk("--> %s\n", __func__);
5196         BUG_ON(clp == NULL);
5197
5198         nfs4_init_boot_verifier(clp, &verifier);
5199
5200         args.id_len = scnprintf(args.id, sizeof(args.id),
5201                                 "%s/%s/%u",
5202                                 clp->cl_ipaddr,
5203                                 clp->cl_rpcclient->cl_nodename,
5204                                 clp->cl_rpcclient->cl_auth->au_flavor);
5205
5206         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5207                                         GFP_NOFS);
5208         if (unlikely(res.server_owner == NULL)) {
5209                 status = -ENOMEM;
5210                 goto out;
5211         }
5212
5213         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5214                                         GFP_NOFS);
5215         if (unlikely(res.server_scope == NULL)) {
5216                 status = -ENOMEM;
5217                 goto out_server_owner;
5218         }
5219
5220         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5221         if (unlikely(res.impl_id == NULL)) {
5222                 status = -ENOMEM;
5223                 goto out_server_scope;
5224         }
5225
5226         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5227         if (status == 0)
5228                 status = nfs4_check_cl_exchange_flags(res.flags);
5229
5230         if (status == 0) {
5231                 clp->cl_clientid = res.clientid;
5232                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5233                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5234                         clp->cl_seqid = res.seqid;
5235
5236                 kfree(clp->cl_serverowner);
5237                 clp->cl_serverowner = res.server_owner;
5238                 res.server_owner = NULL;
5239
5240                 /* use the most recent implementation id */
5241                 kfree(clp->cl_implid);
5242                 clp->cl_implid = res.impl_id;
5243
5244                 if (clp->cl_serverscope != NULL &&
5245                     !nfs41_same_server_scope(clp->cl_serverscope,
5246                                              res.server_scope)) {
5247                         dprintk("%s: server_scope mismatch detected\n",
5248                                 __func__);
5249                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5250                         kfree(clp->cl_serverscope);
5251                         clp->cl_serverscope = NULL;
5252                 }
5253
5254                 if (clp->cl_serverscope == NULL) {
5255                         clp->cl_serverscope = res.server_scope;
5256                         goto out;
5257                 }
5258         } else
5259                 kfree(res.impl_id);
5260
5261 out_server_owner:
5262         kfree(res.server_owner);
5263 out_server_scope:
5264         kfree(res.server_scope);
5265 out:
5266         if (clp->cl_implid != NULL)
5267                 dprintk("%s: Server Implementation ID: "
5268                         "domain: %s, name: %s, date: %llu,%u\n",
5269                         __func__, clp->cl_implid->domain, clp->cl_implid->name,
5270                         clp->cl_implid->date.seconds,
5271                         clp->cl_implid->date.nseconds);
5272         dprintk("<-- %s status= %d\n", __func__, status);
5273         return status;
5274 }
5275
5276 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5277                 struct rpc_cred *cred)
5278 {
5279         struct rpc_message msg = {
5280                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5281                 .rpc_argp = clp,
5282                 .rpc_cred = cred,
5283         };
5284         int status;
5285
5286         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5287         if (status)
5288                 dprintk("NFS: Got error %d from the server %s on "
5289                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5290         return status;
5291 }
5292
5293 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5294                 struct rpc_cred *cred)
5295 {
5296         unsigned int loop;
5297         int ret;
5298
5299         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5300                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5301                 switch (ret) {
5302                 case -NFS4ERR_DELAY:
5303                 case -NFS4ERR_CLIENTID_BUSY:
5304                         ssleep(1);
5305                         break;
5306                 default:
5307                         return ret;
5308                 }
5309         }
5310         return 0;
5311 }
5312
5313 int nfs4_destroy_clientid(struct nfs_client *clp)
5314 {
5315         struct rpc_cred *cred;
5316         int ret = 0;
5317
5318         if (clp->cl_mvops->minor_version < 1)
5319                 goto out;
5320         if (clp->cl_exchange_flags == 0)
5321                 goto out;
5322         cred = nfs4_get_exchange_id_cred(clp);
5323         ret = nfs4_proc_destroy_clientid(clp, cred);
5324         if (cred)
5325                 put_rpccred(cred);
5326         switch (ret) {
5327         case 0:
5328         case -NFS4ERR_STALE_CLIENTID:
5329                 clp->cl_exchange_flags = 0;
5330         }
5331 out:
5332         return ret;
5333 }
5334
5335 struct nfs4_get_lease_time_data {
5336         struct nfs4_get_lease_time_args *args;
5337         struct nfs4_get_lease_time_res *res;
5338         struct nfs_client *clp;
5339 };
5340
5341 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5342                                         void *calldata)
5343 {
5344         int ret;
5345         struct nfs4_get_lease_time_data *data =
5346                         (struct nfs4_get_lease_time_data *)calldata;
5347
5348         dprintk("--> %s\n", __func__);
5349         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5350         /* just setup sequence, do not trigger session recovery
5351            since we're invoked within one */
5352         ret = nfs41_setup_sequence(data->clp->cl_session,
5353                                    &data->args->la_seq_args,
5354                                    &data->res->lr_seq_res, task);
5355
5356         BUG_ON(ret == -EAGAIN);
5357         rpc_call_start(task);
5358         dprintk("<-- %s\n", __func__);
5359 }
5360
5361 /*
5362  * Called from nfs4_state_manager thread for session setup, so don't recover
5363  * from sequence operation or clientid errors.
5364  */
5365 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5366 {
5367         struct nfs4_get_lease_time_data *data =
5368                         (struct nfs4_get_lease_time_data *)calldata;
5369
5370         dprintk("--> %s\n", __func__);
5371         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5372                 return;
5373         switch (task->tk_status) {
5374         case -NFS4ERR_DELAY:
5375         case -NFS4ERR_GRACE:
5376                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5377                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5378                 task->tk_status = 0;
5379                 /* fall through */
5380         case -NFS4ERR_RETRY_UNCACHED_REP:
5381                 rpc_restart_call_prepare(task);
5382                 return;
5383         }
5384         dprintk("<-- %s\n", __func__);
5385 }
5386
5387 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5388         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5389         .rpc_call_done = nfs4_get_lease_time_done,
5390 };
5391
5392 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5393 {
5394         struct rpc_task *task;
5395         struct nfs4_get_lease_time_args args;
5396         struct nfs4_get_lease_time_res res = {
5397                 .lr_fsinfo = fsinfo,
5398         };
5399         struct nfs4_get_lease_time_data data = {
5400                 .args = &args,
5401                 .res = &res,
5402                 .clp = clp,
5403         };
5404         struct rpc_message msg = {
5405                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5406                 .rpc_argp = &args,
5407                 .rpc_resp = &res,
5408         };
5409         struct rpc_task_setup task_setup = {
5410                 .rpc_client = clp->cl_rpcclient,
5411                 .rpc_message = &msg,
5412                 .callback_ops = &nfs4_get_lease_time_ops,
5413                 .callback_data = &data,
5414                 .flags = RPC_TASK_TIMEOUT,
5415         };
5416         int status;
5417
5418         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5419         dprintk("--> %s\n", __func__);
5420         task = rpc_run_task(&task_setup);
5421
5422         if (IS_ERR(task))
5423                 status = PTR_ERR(task);
5424         else {
5425                 status = task->tk_status;
5426                 rpc_put_task(task);
5427         }
5428         dprintk("<-- %s return %d\n", __func__, status);
5429
5430         return status;
5431 }
5432
5433 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5434 {
5435         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5436 }
5437
5438 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5439                 struct nfs4_slot *new,
5440                 u32 max_slots,
5441                 u32 ivalue)
5442 {
5443         struct nfs4_slot *old = NULL;
5444         u32 i;
5445
5446         spin_lock(&tbl->slot_tbl_lock);
5447         if (new) {
5448                 old = tbl->slots;
5449                 tbl->slots = new;
5450                 tbl->max_slots = max_slots;
5451         }
5452         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5453         for (i = 0; i < tbl->max_slots; i++)
5454                 tbl->slots[i].seq_nr = ivalue;
5455         spin_unlock(&tbl->slot_tbl_lock);
5456         kfree(old);
5457 }
5458
5459 /*
5460  * (re)Initialise a slot table
5461  */
5462 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5463                                  u32 ivalue)
5464 {
5465         struct nfs4_slot *new = NULL;
5466         int ret = -ENOMEM;
5467
5468         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5469                 max_reqs, tbl->max_slots);
5470
5471         /* Does the newly negotiated max_reqs match the existing slot table? */
5472         if (max_reqs != tbl->max_slots) {
5473                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5474                 if (!new)
5475                         goto out;
5476         }
5477         ret = 0;
5478
5479         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5480         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5481                 tbl, tbl->slots, tbl->max_slots);
5482 out:
5483         dprintk("<-- %s: return %d\n", __func__, ret);
5484         return ret;
5485 }
5486
5487 /* Destroy the slot table */
5488 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5489 {
5490         if (session->fc_slot_table.slots != NULL) {
5491                 kfree(session->fc_slot_table.slots);
5492                 session->fc_slot_table.slots = NULL;
5493         }
5494         if (session->bc_slot_table.slots != NULL) {
5495                 kfree(session->bc_slot_table.slots);
5496                 session->bc_slot_table.slots = NULL;
5497         }
5498         return;
5499 }
5500
5501 /*
5502  * Initialize or reset the forechannel and backchannel tables
5503  */
5504 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5505 {
5506         struct nfs4_slot_table *tbl;
5507         int status;
5508
5509         dprintk("--> %s\n", __func__);
5510         /* Fore channel */
5511         tbl = &ses->fc_slot_table;
5512         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5513         if (status) /* -ENOMEM */
5514                 return status;
5515         /* Back channel */
5516         tbl = &ses->bc_slot_table;
5517         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5518         if (status && tbl->slots == NULL)
5519                 /* Fore and back channel share a connection so get
5520                  * both slot tables or neither */
5521                 nfs4_destroy_slot_tables(ses);
5522         return status;
5523 }
5524
5525 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5526 {
5527         struct nfs4_session *session;
5528         struct nfs4_slot_table *tbl;
5529
5530         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5531         if (!session)
5532                 return NULL;
5533
5534         tbl = &session->fc_slot_table;
5535         tbl->highest_used_slotid = NFS4_NO_SLOT;
5536         spin_lock_init(&tbl->slot_tbl_lock);
5537         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5538         init_completion(&tbl->complete);
5539
5540         tbl = &session->bc_slot_table;
5541         tbl->highest_used_slotid = NFS4_NO_SLOT;
5542         spin_lock_init(&tbl->slot_tbl_lock);
5543         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5544         init_completion(&tbl->complete);
5545
5546         session->session_state = 1<<NFS4_SESSION_INITING;
5547
5548         session->clp = clp;
5549         return session;
5550 }
5551
5552 void nfs4_destroy_session(struct nfs4_session *session)
5553 {
5554         struct rpc_xprt *xprt;
5555         struct rpc_cred *cred;
5556
5557         cred = nfs4_get_exchange_id_cred(session->clp);
5558         nfs4_proc_destroy_session(session, cred);
5559         if (cred)
5560                 put_rpccred(cred);
5561
5562         rcu_read_lock();
5563         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5564         rcu_read_unlock();
5565         dprintk("%s Destroy backchannel for xprt %p\n",
5566                 __func__, xprt);
5567         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5568         nfs4_destroy_slot_tables(session);
5569         kfree(session);
5570 }
5571
5572 /*
5573  * Initialize the values to be used by the client in CREATE_SESSION
5574  * If nfs4_init_session set the fore channel request and response sizes,
5575  * use them.
5576  *
5577  * Set the back channel max_resp_sz_cached to zero to force the client to
5578  * always set csa_cachethis to FALSE because the current implementation
5579  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5580  */
5581 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5582 {
5583         struct nfs4_session *session = args->client->cl_session;
5584         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5585                      mxresp_sz = session->fc_attrs.max_resp_sz;
5586
5587         if (mxrqst_sz == 0)
5588                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5589         if (mxresp_sz == 0)
5590                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5591         /* Fore channel attributes */
5592         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5593         args->fc_attrs.max_resp_sz = mxresp_sz;
5594         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5595         args->fc_attrs.max_reqs = max_session_slots;
5596
5597         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5598                 "max_ops=%u max_reqs=%u\n",
5599                 __func__,
5600                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5601                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5602
5603         /* Back channel attributes */
5604         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5605         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5606         args->bc_attrs.max_resp_sz_cached = 0;
5607         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5608         args->bc_attrs.max_reqs = 1;
5609
5610         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5611                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5612                 __func__,
5613                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5614                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5615                 args->bc_attrs.max_reqs);
5616 }
5617
5618 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5619 {
5620         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5621         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5622
5623         if (rcvd->max_resp_sz > sent->max_resp_sz)
5624                 return -EINVAL;
5625         /*
5626          * Our requested max_ops is the minimum we need; we're not
5627          * prepared to break up compounds into smaller pieces than that.
5628          * So, no point even trying to continue if the server won't
5629          * cooperate:
5630          */
5631         if (rcvd->max_ops < sent->max_ops)
5632                 return -EINVAL;
5633         if (rcvd->max_reqs == 0)
5634                 return -EINVAL;
5635         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5636                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5637         return 0;
5638 }
5639
5640 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5641 {
5642         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5643         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5644
5645         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5646                 return -EINVAL;
5647         if (rcvd->max_resp_sz < sent->max_resp_sz)
5648                 return -EINVAL;
5649         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5650                 return -EINVAL;
5651         /* These would render the backchannel useless: */
5652         if (rcvd->max_ops != sent->max_ops)
5653                 return -EINVAL;
5654         if (rcvd->max_reqs != sent->max_reqs)
5655                 return -EINVAL;
5656         return 0;
5657 }
5658
5659 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5660                                      struct nfs4_session *session)
5661 {
5662         int ret;
5663
5664         ret = nfs4_verify_fore_channel_attrs(args, session);
5665         if (ret)
5666                 return ret;
5667         return nfs4_verify_back_channel_attrs(args, session);
5668 }
5669
5670 static int _nfs4_proc_create_session(struct nfs_client *clp,
5671                 struct rpc_cred *cred)
5672 {
5673         struct nfs4_session *session = clp->cl_session;
5674         struct nfs41_create_session_args args = {
5675                 .client = clp,
5676                 .cb_program = NFS4_CALLBACK,
5677         };
5678         struct nfs41_create_session_res res = {
5679                 .client = clp,
5680         };
5681         struct rpc_message msg = {
5682                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5683                 .rpc_argp = &args,
5684                 .rpc_resp = &res,
5685                 .rpc_cred = cred,
5686         };
5687         int status;
5688
5689         nfs4_init_channel_attrs(&args);
5690         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5691
5692         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5693
5694         if (!status)
5695                 /* Verify the session's negotiated channel_attrs values */
5696                 status = nfs4_verify_channel_attrs(&args, session);
5697         if (!status) {
5698                 /* Increment the clientid slot sequence id */
5699                 clp->cl_seqid++;
5700         }
5701
5702         return status;
5703 }
5704
5705 /*
5706  * Issues a CREATE_SESSION operation to the server.
5707  * It is the responsibility of the caller to verify the session is
5708  * expired before calling this routine.
5709  */
5710 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5711 {
5712         int status;
5713         unsigned *ptr;
5714         struct nfs4_session *session = clp->cl_session;
5715
5716         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5717
5718         status = _nfs4_proc_create_session(clp, cred);
5719         if (status)
5720                 goto out;
5721
5722         /* Init or reset the session slot tables */
5723         status = nfs4_setup_session_slot_tables(session);
5724         dprintk("slot table setup returned %d\n", status);
5725         if (status)
5726                 goto out;
5727
5728         ptr = (unsigned *)&session->sess_id.data[0];
5729         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5730                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5731 out:
5732         dprintk("<-- %s\n", __func__);
5733         return status;
5734 }
5735
5736 /*
5737  * Issue the over-the-wire RPC DESTROY_SESSION.
5738  * The caller must serialize access to this routine.
5739  */
5740 int nfs4_proc_destroy_session(struct nfs4_session *session,
5741                 struct rpc_cred *cred)
5742 {
5743         struct rpc_message msg = {
5744                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5745                 .rpc_argp = session,
5746                 .rpc_cred = cred,
5747         };
5748         int status = 0;
5749
5750         dprintk("--> nfs4_proc_destroy_session\n");
5751
5752         /* session is still being setup */
5753         if (session->clp->cl_cons_state != NFS_CS_READY)
5754                 return status;
5755
5756         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5757
5758         if (status)
5759                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5760                         "Session has been destroyed regardless...\n", status);
5761
5762         dprintk("<-- nfs4_proc_destroy_session\n");
5763         return status;
5764 }
5765
5766 /*
5767  * With sessions, the client is not marked ready until after a
5768  * successful EXCHANGE_ID and CREATE_SESSION.
5769  *
5770  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5771  * other versions of NFS can be tried.
5772  */
5773 static int nfs41_check_session_ready(struct nfs_client *clp)
5774 {
5775         int ret;
5776
5777         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
5778                 ret = nfs4_client_recover_expired_lease(clp);
5779                 if (ret)
5780                         return ret;
5781         }
5782         if (clp->cl_cons_state < NFS_CS_READY)
5783                 return -EPROTONOSUPPORT;
5784         smp_rmb();
5785         return 0;
5786 }
5787
5788 int nfs4_init_session(struct nfs_server *server)
5789 {
5790         struct nfs_client *clp = server->nfs_client;
5791         struct nfs4_session *session;
5792         unsigned int rsize, wsize;
5793
5794         if (!nfs4_has_session(clp))
5795                 return 0;
5796
5797         session = clp->cl_session;
5798         spin_lock(&clp->cl_lock);
5799         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5800
5801                 rsize = server->rsize;
5802                 if (rsize == 0)
5803                         rsize = NFS_MAX_FILE_IO_SIZE;
5804                 wsize = server->wsize;
5805                 if (wsize == 0)
5806                         wsize = NFS_MAX_FILE_IO_SIZE;
5807
5808                 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5809                 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5810         }
5811         spin_unlock(&clp->cl_lock);
5812
5813         return nfs41_check_session_ready(clp);
5814 }
5815
5816 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
5817 {
5818         struct nfs4_session *session = clp->cl_session;
5819         int ret;
5820
5821         spin_lock(&clp->cl_lock);
5822         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5823                 /*
5824                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
5825                  * DS lease to be equal to the MDS lease.
5826                  */
5827                 clp->cl_lease_time = lease_time;
5828                 clp->cl_last_renewal = jiffies;
5829         }
5830         spin_unlock(&clp->cl_lock);
5831
5832         ret = nfs41_check_session_ready(clp);
5833         if (ret)
5834                 return ret;
5835         /* Test for the DS role */
5836         if (!is_ds_client(clp))
5837                 return -ENODEV;
5838         return 0;
5839 }
5840 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5841
5842
5843 /*
5844  * Renew the cl_session lease.
5845  */
5846 struct nfs4_sequence_data {
5847         struct nfs_client *clp;
5848         struct nfs4_sequence_args args;
5849         struct nfs4_sequence_res res;
5850 };
5851
5852 static void nfs41_sequence_release(void *data)
5853 {
5854         struct nfs4_sequence_data *calldata = data;
5855         struct nfs_client *clp = calldata->clp;
5856
5857         if (atomic_read(&clp->cl_count) > 1)
5858                 nfs4_schedule_state_renewal(clp);
5859         nfs_put_client(clp);
5860         kfree(calldata);
5861 }
5862
5863 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5864 {
5865         switch(task->tk_status) {
5866         case -NFS4ERR_DELAY:
5867                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5868                 return -EAGAIN;
5869         default:
5870                 nfs4_schedule_lease_recovery(clp);
5871         }
5872         return 0;
5873 }
5874
5875 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5876 {
5877         struct nfs4_sequence_data *calldata = data;
5878         struct nfs_client *clp = calldata->clp;
5879
5880         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5881                 return;
5882
5883         if (task->tk_status < 0) {
5884                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5885                 if (atomic_read(&clp->cl_count) == 1)
5886                         goto out;
5887
5888                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5889                         rpc_restart_call_prepare(task);
5890                         return;
5891                 }
5892         }
5893         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5894 out:
5895         dprintk("<-- %s\n", __func__);
5896 }
5897
5898 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5899 {
5900         struct nfs4_sequence_data *calldata = data;
5901         struct nfs_client *clp = calldata->clp;
5902         struct nfs4_sequence_args *args;
5903         struct nfs4_sequence_res *res;
5904
5905         args = task->tk_msg.rpc_argp;
5906         res = task->tk_msg.rpc_resp;
5907
5908         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5909                 return;
5910         rpc_call_start(task);
5911 }
5912
5913 static const struct rpc_call_ops nfs41_sequence_ops = {
5914         .rpc_call_done = nfs41_sequence_call_done,
5915         .rpc_call_prepare = nfs41_sequence_prepare,
5916         .rpc_release = nfs41_sequence_release,
5917 };
5918
5919 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5920 {
5921         struct nfs4_sequence_data *calldata;
5922         struct rpc_message msg = {
5923                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5924                 .rpc_cred = cred,
5925         };
5926         struct rpc_task_setup task_setup_data = {
5927                 .rpc_client = clp->cl_rpcclient,
5928                 .rpc_message = &msg,
5929                 .callback_ops = &nfs41_sequence_ops,
5930                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5931         };
5932
5933         if (!atomic_inc_not_zero(&clp->cl_count))
5934                 return ERR_PTR(-EIO);
5935         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5936         if (calldata == NULL) {
5937                 nfs_put_client(clp);
5938                 return ERR_PTR(-ENOMEM);
5939         }
5940         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5941         msg.rpc_argp = &calldata->args;
5942         msg.rpc_resp = &calldata->res;
5943         calldata->clp = clp;
5944         task_setup_data.callback_data = calldata;
5945
5946         return rpc_run_task(&task_setup_data);
5947 }
5948
5949 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5950 {
5951         struct rpc_task *task;
5952         int ret = 0;
5953
5954         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5955                 return 0;
5956         task = _nfs41_proc_sequence(clp, cred);
5957         if (IS_ERR(task))
5958                 ret = PTR_ERR(task);
5959         else
5960                 rpc_put_task_async(task);
5961         dprintk("<-- %s status=%d\n", __func__, ret);
5962         return ret;
5963 }
5964
5965 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5966 {
5967         struct rpc_task *task;
5968         int ret;
5969
5970         task = _nfs41_proc_sequence(clp, cred);
5971         if (IS_ERR(task)) {
5972                 ret = PTR_ERR(task);
5973                 goto out;
5974         }
5975         ret = rpc_wait_for_completion_task(task);
5976         if (!ret) {
5977                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5978
5979                 if (task->tk_status == 0)
5980                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5981                 ret = task->tk_status;
5982         }
5983         rpc_put_task(task);
5984 out:
5985         dprintk("<-- %s status=%d\n", __func__, ret);
5986         return ret;
5987 }
5988
5989 struct nfs4_reclaim_complete_data {
5990         struct nfs_client *clp;
5991         struct nfs41_reclaim_complete_args arg;
5992         struct nfs41_reclaim_complete_res res;
5993 };
5994
5995 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5996 {
5997         struct nfs4_reclaim_complete_data *calldata = data;
5998
5999         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6000         if (nfs41_setup_sequence(calldata->clp->cl_session,
6001                                 &calldata->arg.seq_args,
6002                                 &calldata->res.seq_res, task))
6003                 return;
6004
6005         rpc_call_start(task);
6006 }
6007
6008 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6009 {
6010         switch(task->tk_status) {
6011         case 0:
6012         case -NFS4ERR_COMPLETE_ALREADY:
6013         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6014                 break;
6015         case -NFS4ERR_DELAY:
6016                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6017                 /* fall through */
6018         case -NFS4ERR_RETRY_UNCACHED_REP:
6019                 return -EAGAIN;
6020         default:
6021                 nfs4_schedule_lease_recovery(clp);
6022         }
6023         return 0;
6024 }
6025
6026 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6027 {
6028         struct nfs4_reclaim_complete_data *calldata = data;
6029         struct nfs_client *clp = calldata->clp;
6030         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6031
6032         dprintk("--> %s\n", __func__);
6033         if (!nfs41_sequence_done(task, res))
6034                 return;
6035
6036         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6037                 rpc_restart_call_prepare(task);
6038                 return;
6039         }
6040         dprintk("<-- %s\n", __func__);
6041 }
6042
6043 static void nfs4_free_reclaim_complete_data(void *data)
6044 {
6045         struct nfs4_reclaim_complete_data *calldata = data;
6046
6047         kfree(calldata);
6048 }
6049
6050 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6051         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6052         .rpc_call_done = nfs4_reclaim_complete_done,
6053         .rpc_release = nfs4_free_reclaim_complete_data,
6054 };
6055
6056 /*
6057  * Issue a global reclaim complete.
6058  */
6059 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6060 {
6061         struct nfs4_reclaim_complete_data *calldata;
6062         struct rpc_task *task;
6063         struct rpc_message msg = {
6064                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6065         };
6066         struct rpc_task_setup task_setup_data = {
6067                 .rpc_client = clp->cl_rpcclient,
6068                 .rpc_message = &msg,
6069                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6070                 .flags = RPC_TASK_ASYNC,
6071         };
6072         int status = -ENOMEM;
6073
6074         dprintk("--> %s\n", __func__);
6075         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6076         if (calldata == NULL)
6077                 goto out;
6078         calldata->clp = clp;
6079         calldata->arg.one_fs = 0;
6080
6081         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6082         msg.rpc_argp = &calldata->arg;
6083         msg.rpc_resp = &calldata->res;
6084         task_setup_data.callback_data = calldata;
6085         task = rpc_run_task(&task_setup_data);
6086         if (IS_ERR(task)) {
6087                 status = PTR_ERR(task);
6088                 goto out;
6089         }
6090         status = nfs4_wait_for_completion_rpc_task(task);
6091         if (status == 0)
6092                 status = task->tk_status;
6093         rpc_put_task(task);
6094         return 0;
6095 out:
6096         dprintk("<-- %s status=%d\n", __func__, status);
6097         return status;
6098 }
6099
6100 static void
6101 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6102 {
6103         struct nfs4_layoutget *lgp = calldata;
6104         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6105
6106         dprintk("--> %s\n", __func__);
6107         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6108          * right now covering the LAYOUTGET we are about to send.
6109          * However, that is not so catastrophic, and there seems
6110          * to be no way to prevent it completely.
6111          */
6112         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6113                                 &lgp->res.seq_res, task))
6114                 return;
6115         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6116                                           NFS_I(lgp->args.inode)->layout,
6117                                           lgp->args.ctx->state)) {
6118                 rpc_exit(task, NFS4_OK);
6119                 return;
6120         }
6121         rpc_call_start(task);
6122 }
6123
6124 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6125 {
6126         struct nfs4_layoutget *lgp = calldata;
6127         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6128
6129         dprintk("--> %s\n", __func__);
6130
6131         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6132                 return;
6133
6134         switch (task->tk_status) {
6135         case 0:
6136                 break;
6137         case -NFS4ERR_LAYOUTTRYLATER:
6138         case -NFS4ERR_RECALLCONFLICT:
6139                 task->tk_status = -NFS4ERR_DELAY;
6140                 /* Fall through */
6141         default:
6142                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6143                         rpc_restart_call_prepare(task);
6144                         return;
6145                 }
6146         }
6147         dprintk("<-- %s\n", __func__);
6148 }
6149
6150 static void nfs4_layoutget_release(void *calldata)
6151 {
6152         struct nfs4_layoutget *lgp = calldata;
6153
6154         dprintk("--> %s\n", __func__);
6155         put_nfs_open_context(lgp->args.ctx);
6156         kfree(calldata);
6157         dprintk("<-- %s\n", __func__);
6158 }
6159
6160 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6161         .rpc_call_prepare = nfs4_layoutget_prepare,
6162         .rpc_call_done = nfs4_layoutget_done,
6163         .rpc_release = nfs4_layoutget_release,
6164 };
6165
6166 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
6167 {
6168         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6169         struct rpc_task *task;
6170         struct rpc_message msg = {
6171                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6172                 .rpc_argp = &lgp->args,
6173                 .rpc_resp = &lgp->res,
6174         };
6175         struct rpc_task_setup task_setup_data = {
6176                 .rpc_client = server->client,
6177                 .rpc_message = &msg,
6178                 .callback_ops = &nfs4_layoutget_call_ops,
6179                 .callback_data = lgp,
6180                 .flags = RPC_TASK_ASYNC,
6181         };
6182         int status = 0;
6183
6184         dprintk("--> %s\n", __func__);
6185
6186         lgp->res.layoutp = &lgp->args.layout;
6187         lgp->res.seq_res.sr_slot = NULL;
6188         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6189         task = rpc_run_task(&task_setup_data);
6190         if (IS_ERR(task))
6191                 return PTR_ERR(task);
6192         status = nfs4_wait_for_completion_rpc_task(task);
6193         if (status == 0)
6194                 status = task->tk_status;
6195         if (status == 0)
6196                 status = pnfs_layout_process(lgp);
6197         rpc_put_task(task);
6198         dprintk("<-- %s status=%d\n", __func__, status);
6199         return status;
6200 }
6201
6202 static void
6203 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6204 {
6205         struct nfs4_layoutreturn *lrp = calldata;
6206
6207         dprintk("--> %s\n", __func__);
6208         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6209                                 &lrp->res.seq_res, task))
6210                 return;
6211         rpc_call_start(task);
6212 }
6213
6214 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6215 {
6216         struct nfs4_layoutreturn *lrp = calldata;
6217         struct nfs_server *server;
6218         struct pnfs_layout_hdr *lo = lrp->args.layout;
6219
6220         dprintk("--> %s\n", __func__);
6221
6222         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6223                 return;
6224
6225         server = NFS_SERVER(lrp->args.inode);
6226         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6227                 rpc_restart_call_prepare(task);
6228                 return;
6229         }
6230         spin_lock(&lo->plh_inode->i_lock);
6231         if (task->tk_status == 0) {
6232                 if (lrp->res.lrs_present) {
6233                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6234                 } else
6235                         BUG_ON(!list_empty(&lo->plh_segs));
6236         }
6237         lo->plh_block_lgets--;
6238         spin_unlock(&lo->plh_inode->i_lock);
6239         dprintk("<-- %s\n", __func__);
6240 }
6241
6242 static void nfs4_layoutreturn_release(void *calldata)
6243 {
6244         struct nfs4_layoutreturn *lrp = calldata;
6245
6246         dprintk("--> %s\n", __func__);
6247         put_layout_hdr(lrp->args.layout);
6248         kfree(calldata);
6249         dprintk("<-- %s\n", __func__);
6250 }
6251
6252 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6253         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6254         .rpc_call_done = nfs4_layoutreturn_done,
6255         .rpc_release = nfs4_layoutreturn_release,
6256 };
6257
6258 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6259 {
6260         struct rpc_task *task;
6261         struct rpc_message msg = {
6262                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6263                 .rpc_argp = &lrp->args,
6264                 .rpc_resp = &lrp->res,
6265         };
6266         struct rpc_task_setup task_setup_data = {
6267                 .rpc_client = lrp->clp->cl_rpcclient,
6268                 .rpc_message = &msg,
6269                 .callback_ops = &nfs4_layoutreturn_call_ops,
6270                 .callback_data = lrp,
6271         };
6272         int status;
6273
6274         dprintk("--> %s\n", __func__);
6275         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6276         task = rpc_run_task(&task_setup_data);
6277         if (IS_ERR(task))
6278                 return PTR_ERR(task);
6279         status = task->tk_status;
6280         dprintk("<-- %s status=%d\n", __func__, status);
6281         rpc_put_task(task);
6282         return status;
6283 }
6284
6285 /*
6286  * Retrieve the list of Data Server devices from the MDS.
6287  */
6288 static int _nfs4_getdevicelist(struct nfs_server *server,
6289                                     const struct nfs_fh *fh,
6290                                     struct pnfs_devicelist *devlist)
6291 {
6292         struct nfs4_getdevicelist_args args = {
6293                 .fh = fh,
6294                 .layoutclass = server->pnfs_curr_ld->id,
6295         };
6296         struct nfs4_getdevicelist_res res = {
6297                 .devlist = devlist,
6298         };
6299         struct rpc_message msg = {
6300                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6301                 .rpc_argp = &args,
6302                 .rpc_resp = &res,
6303         };
6304         int status;
6305
6306         dprintk("--> %s\n", __func__);
6307         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6308                                 &res.seq_res, 0);
6309         dprintk("<-- %s status=%d\n", __func__, status);
6310         return status;
6311 }
6312
6313 int nfs4_proc_getdevicelist(struct nfs_server *server,
6314                             const struct nfs_fh *fh,
6315                             struct pnfs_devicelist *devlist)
6316 {
6317         struct nfs4_exception exception = { };
6318         int err;
6319
6320         do {
6321                 err = nfs4_handle_exception(server,
6322                                 _nfs4_getdevicelist(server, fh, devlist),
6323                                 &exception);
6324         } while (exception.retry);
6325
6326         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6327                 err, devlist->num_devs);
6328
6329         return err;
6330 }
6331 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6332
6333 static int
6334 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6335 {
6336         struct nfs4_getdeviceinfo_args args = {
6337                 .pdev = pdev,
6338         };
6339         struct nfs4_getdeviceinfo_res res = {
6340                 .pdev = pdev,
6341         };
6342         struct rpc_message msg = {
6343                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6344                 .rpc_argp = &args,
6345                 .rpc_resp = &res,
6346         };
6347         int status;
6348
6349         dprintk("--> %s\n", __func__);
6350         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6351         dprintk("<-- %s status=%d\n", __func__, status);
6352
6353         return status;
6354 }
6355
6356 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6357 {
6358         struct nfs4_exception exception = { };
6359         int err;
6360
6361         do {
6362                 err = nfs4_handle_exception(server,
6363                                         _nfs4_proc_getdeviceinfo(server, pdev),
6364                                         &exception);
6365         } while (exception.retry);
6366         return err;
6367 }
6368 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6369
6370 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6371 {
6372         struct nfs4_layoutcommit_data *data = calldata;
6373         struct nfs_server *server = NFS_SERVER(data->args.inode);
6374
6375         if (nfs4_setup_sequence(server, &data->args.seq_args,
6376                                 &data->res.seq_res, task))
6377                 return;
6378         rpc_call_start(task);
6379 }
6380
6381 static void
6382 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6383 {
6384         struct nfs4_layoutcommit_data *data = calldata;
6385         struct nfs_server *server = NFS_SERVER(data->args.inode);
6386
6387         if (!nfs4_sequence_done(task, &data->res.seq_res))
6388                 return;
6389
6390         switch (task->tk_status) { /* Just ignore these failures */
6391         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6392         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6393         case -NFS4ERR_BADLAYOUT:     /* no layout */
6394         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6395                 task->tk_status = 0;
6396                 break;
6397         case 0:
6398                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6399                                                    data->res.fattr);
6400                 break;
6401         default:
6402                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6403                         rpc_restart_call_prepare(task);
6404                         return;
6405                 }
6406         }
6407 }
6408
6409 static void nfs4_layoutcommit_release(void *calldata)
6410 {
6411         struct nfs4_layoutcommit_data *data = calldata;
6412         struct pnfs_layout_segment *lseg, *tmp;
6413         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6414
6415         pnfs_cleanup_layoutcommit(data);
6416         /* Matched by references in pnfs_set_layoutcommit */
6417         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6418                 list_del_init(&lseg->pls_lc_list);
6419                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6420                                        &lseg->pls_flags))
6421                         put_lseg(lseg);
6422         }
6423
6424         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6425         smp_mb__after_clear_bit();
6426         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6427
6428         put_rpccred(data->cred);
6429         kfree(data);
6430 }
6431
6432 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6433         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6434         .rpc_call_done = nfs4_layoutcommit_done,
6435         .rpc_release = nfs4_layoutcommit_release,
6436 };
6437
6438 int
6439 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6440 {
6441         struct rpc_message msg = {
6442                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6443                 .rpc_argp = &data->args,
6444                 .rpc_resp = &data->res,
6445                 .rpc_cred = data->cred,
6446         };
6447         struct rpc_task_setup task_setup_data = {
6448                 .task = &data->task,
6449                 .rpc_client = NFS_CLIENT(data->args.inode),
6450                 .rpc_message = &msg,
6451                 .callback_ops = &nfs4_layoutcommit_ops,
6452                 .callback_data = data,
6453                 .flags = RPC_TASK_ASYNC,
6454         };
6455         struct rpc_task *task;
6456         int status = 0;
6457
6458         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6459                 "lbw: %llu inode %lu\n",
6460                 data->task.tk_pid, sync,
6461                 data->args.lastbytewritten,
6462                 data->args.inode->i_ino);
6463
6464         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6465         task = rpc_run_task(&task_setup_data);
6466         if (IS_ERR(task))
6467                 return PTR_ERR(task);
6468         if (sync == false)
6469                 goto out;
6470         status = nfs4_wait_for_completion_rpc_task(task);
6471         if (status != 0)
6472                 goto out;
6473         status = task->tk_status;
6474 out:
6475         dprintk("%s: status %d\n", __func__, status);
6476         rpc_put_task(task);
6477         return status;
6478 }
6479
6480 static int
6481 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6482                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6483 {
6484         struct nfs41_secinfo_no_name_args args = {
6485                 .style = SECINFO_STYLE_CURRENT_FH,
6486         };
6487         struct nfs4_secinfo_res res = {
6488                 .flavors = flavors,
6489         };
6490         struct rpc_message msg = {
6491                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6492                 .rpc_argp = &args,
6493                 .rpc_resp = &res,
6494         };
6495         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6496 }
6497
6498 static int
6499 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6500                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6501 {
6502         struct nfs4_exception exception = { };
6503         int err;
6504         do {
6505                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6506                 switch (err) {
6507                 case 0:
6508                 case -NFS4ERR_WRONGSEC:
6509                 case -NFS4ERR_NOTSUPP:
6510                         goto out;
6511                 default:
6512                         err = nfs4_handle_exception(server, err, &exception);
6513                 }
6514         } while (exception.retry);
6515 out:
6516         return err;
6517 }
6518
6519 static int
6520 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6521                     struct nfs_fsinfo *info)
6522 {
6523         int err;
6524         struct page *page;
6525         rpc_authflavor_t flavor;
6526         struct nfs4_secinfo_flavors *flavors;
6527
6528         page = alloc_page(GFP_KERNEL);
6529         if (!page) {
6530                 err = -ENOMEM;
6531                 goto out;
6532         }
6533
6534         flavors = page_address(page);
6535         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6536
6537         /*
6538          * Fall back on "guess and check" method if
6539          * the server doesn't support SECINFO_NO_NAME
6540          */
6541         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6542                 err = nfs4_find_root_sec(server, fhandle, info);
6543                 goto out_freepage;
6544         }
6545         if (err)
6546                 goto out_freepage;
6547
6548         flavor = nfs_find_best_sec(flavors);
6549         if (err == 0)
6550                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6551
6552 out_freepage:
6553         put_page(page);
6554         if (err == -EACCES)
6555                 return -EPERM;
6556 out:
6557         return err;
6558 }
6559
6560 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6561 {
6562         int status;
6563         struct nfs41_test_stateid_args args = {
6564                 .stateid = stateid,
6565         };
6566         struct nfs41_test_stateid_res res;
6567         struct rpc_message msg = {
6568                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6569                 .rpc_argp = &args,
6570                 .rpc_resp = &res,
6571         };
6572
6573         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6574         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6575
6576         if (status == NFS_OK)
6577                 return res.status;
6578         return status;
6579 }
6580
6581 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6582 {
6583         struct nfs4_exception exception = { };
6584         int err;
6585         do {
6586                 err = nfs4_handle_exception(server,
6587                                 _nfs41_test_stateid(server, stateid),
6588                                 &exception);
6589         } while (exception.retry);
6590         return err;
6591 }
6592
6593 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6594 {
6595         struct nfs41_free_stateid_args args = {
6596                 .stateid = stateid,
6597         };
6598         struct nfs41_free_stateid_res res;
6599         struct rpc_message msg = {
6600                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6601                 .rpc_argp = &args,
6602                 .rpc_resp = &res,
6603         };
6604
6605         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6606         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6607 }
6608
6609 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6610 {
6611         struct nfs4_exception exception = { };
6612         int err;
6613         do {
6614                 err = nfs4_handle_exception(server,
6615                                 _nfs4_free_stateid(server, stateid),
6616                                 &exception);
6617         } while (exception.retry);
6618         return err;
6619 }
6620
6621 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6622                 const nfs4_stateid *s2)
6623 {
6624         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6625                 return false;
6626
6627         if (s1->seqid == s2->seqid)
6628                 return true;
6629         if (s1->seqid == 0 || s2->seqid == 0)
6630                 return true;
6631
6632         return false;
6633 }
6634
6635 #endif /* CONFIG_NFS_V4_1 */
6636
6637 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6638                 const nfs4_stateid *s2)
6639 {
6640         return nfs4_stateid_match(s1, s2);
6641 }
6642
6643
6644 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6645         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6646         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6647         .recover_open   = nfs4_open_reclaim,
6648         .recover_lock   = nfs4_lock_reclaim,
6649         .establish_clid = nfs4_init_clientid,
6650         .get_clid_cred  = nfs4_get_setclientid_cred,
6651 };
6652
6653 #if defined(CONFIG_NFS_V4_1)
6654 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6655         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6656         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6657         .recover_open   = nfs4_open_reclaim,
6658         .recover_lock   = nfs4_lock_reclaim,
6659         .establish_clid = nfs41_init_clientid,
6660         .get_clid_cred  = nfs4_get_exchange_id_cred,
6661         .reclaim_complete = nfs41_proc_reclaim_complete,
6662 };
6663 #endif /* CONFIG_NFS_V4_1 */
6664
6665 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6666         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6667         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6668         .recover_open   = nfs4_open_expired,
6669         .recover_lock   = nfs4_lock_expired,
6670         .establish_clid = nfs4_init_clientid,
6671         .get_clid_cred  = nfs4_get_setclientid_cred,
6672 };
6673
6674 #if defined(CONFIG_NFS_V4_1)
6675 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6676         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6677         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6678         .recover_open   = nfs41_open_expired,
6679         .recover_lock   = nfs41_lock_expired,
6680         .establish_clid = nfs41_init_clientid,
6681         .get_clid_cred  = nfs4_get_exchange_id_cred,
6682 };
6683 #endif /* CONFIG_NFS_V4_1 */
6684
6685 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6686         .sched_state_renewal = nfs4_proc_async_renew,
6687         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6688         .renew_lease = nfs4_proc_renew,
6689 };
6690
6691 #if defined(CONFIG_NFS_V4_1)
6692 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6693         .sched_state_renewal = nfs41_proc_async_sequence,
6694         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6695         .renew_lease = nfs4_proc_sequence,
6696 };
6697 #endif
6698
6699 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6700         .minor_version = 0,
6701         .call_sync = _nfs4_call_sync,
6702         .match_stateid = nfs4_match_stateid,
6703         .find_root_sec = nfs4_find_root_sec,
6704         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6705         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6706         .state_renewal_ops = &nfs40_state_renewal_ops,
6707 };
6708
6709 #if defined(CONFIG_NFS_V4_1)
6710 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6711         .minor_version = 1,
6712         .call_sync = _nfs4_call_sync_session,
6713         .match_stateid = nfs41_match_stateid,
6714         .find_root_sec = nfs41_find_root_sec,
6715         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6716         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6717         .state_renewal_ops = &nfs41_state_renewal_ops,
6718 };
6719 #endif
6720
6721 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6722         [0] = &nfs_v4_0_minor_ops,
6723 #if defined(CONFIG_NFS_V4_1)
6724         [1] = &nfs_v4_1_minor_ops,
6725 #endif
6726 };
6727
6728 static const struct inode_operations nfs4_file_inode_operations = {
6729         .permission     = nfs_permission,
6730         .getattr        = nfs_getattr,
6731         .setattr        = nfs_setattr,
6732         .getxattr       = generic_getxattr,
6733         .setxattr       = generic_setxattr,
6734         .listxattr      = generic_listxattr,
6735         .removexattr    = generic_removexattr,
6736 };
6737
6738 const struct nfs_rpc_ops nfs_v4_clientops = {
6739         .version        = 4,                    /* protocol version */
6740         .dentry_ops     = &nfs4_dentry_operations,
6741         .dir_inode_ops  = &nfs4_dir_inode_operations,
6742         .file_inode_ops = &nfs4_file_inode_operations,
6743         .file_ops       = &nfs4_file_operations,
6744         .getroot        = nfs4_proc_get_root,
6745         .submount       = nfs4_submount,
6746         .getattr        = nfs4_proc_getattr,
6747         .setattr        = nfs4_proc_setattr,
6748         .lookup         = nfs4_proc_lookup,
6749         .access         = nfs4_proc_access,
6750         .readlink       = nfs4_proc_readlink,
6751         .create         = nfs4_proc_create,
6752         .remove         = nfs4_proc_remove,
6753         .unlink_setup   = nfs4_proc_unlink_setup,
6754         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6755         .unlink_done    = nfs4_proc_unlink_done,
6756         .rename         = nfs4_proc_rename,
6757         .rename_setup   = nfs4_proc_rename_setup,
6758         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6759         .rename_done    = nfs4_proc_rename_done,
6760         .link           = nfs4_proc_link,
6761         .symlink        = nfs4_proc_symlink,
6762         .mkdir          = nfs4_proc_mkdir,
6763         .rmdir          = nfs4_proc_remove,
6764         .readdir        = nfs4_proc_readdir,
6765         .mknod          = nfs4_proc_mknod,
6766         .statfs         = nfs4_proc_statfs,
6767         .fsinfo         = nfs4_proc_fsinfo,
6768         .pathconf       = nfs4_proc_pathconf,
6769         .set_capabilities = nfs4_server_capabilities,
6770         .decode_dirent  = nfs4_decode_dirent,
6771         .read_setup     = nfs4_proc_read_setup,
6772         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6773         .read_done      = nfs4_read_done,
6774         .write_setup    = nfs4_proc_write_setup,
6775         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6776         .write_done     = nfs4_write_done,
6777         .commit_setup   = nfs4_proc_commit_setup,
6778         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6779         .commit_done    = nfs4_commit_done,
6780         .lock           = nfs4_proc_lock,
6781         .clear_acl_cache = nfs4_zap_acl_attr,
6782         .close_context  = nfs4_close_context,
6783         .open_context   = nfs4_atomic_open,
6784         .init_client    = nfs4_init_client,
6785 };
6786
6787 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6788         .prefix = XATTR_NAME_NFSV4_ACL,
6789         .list   = nfs4_xattr_list_nfs4_acl,
6790         .get    = nfs4_xattr_get_nfs4_acl,
6791         .set    = nfs4_xattr_set_nfs4_acl,
6792 };
6793
6794 const struct xattr_handler *nfs4_xattr_handlers[] = {
6795         &nfs4_xattr_nfs4_acl_handler,
6796         NULL
6797 };
6798
6799 module_param(max_session_slots, ushort, 0644);
6800 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6801                 "requests the client will negotiate");
6802
6803 /*
6804  * Local variables:
6805  *  c-basic-offset: 8
6806  * End:
6807  */