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         do {
1906                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1907                                        &res, ctx_th);
1908                 if (status == 0)
1909                         break;
1910                 /* NOTE: BAD_SEQID means the server and client disagree about the
1911                  * book-keeping w.r.t. state-changing operations
1912                  * (OPEN/CLOSE/LOCK/LOCKU...)
1913                  * It is actually a sign of a bug on the client or on the server.
1914                  *
1915                  * If we receive a BAD_SEQID error in the particular case of
1916                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1917                  * have unhashed the old state_owner for us, and that we can
1918                  * therefore safely retry using a new one. We should still warn
1919                  * the user though...
1920                  */
1921                 if (status == -NFS4ERR_BAD_SEQID) {
1922                         pr_warn_ratelimited("NFS: v4 server %s "
1923                                         " returned a bad sequence-id error!\n",
1924                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1925                         exception.retry = 1;
1926                         continue;
1927                 }
1928                 /*
1929                  * BAD_STATEID on OPEN means that the server cancelled our
1930                  * state before it received the OPEN_CONFIRM.
1931                  * Recover by retrying the request as per the discussion
1932                  * on Page 181 of RFC3530.
1933                  */
1934                 if (status == -NFS4ERR_BAD_STATEID) {
1935                         exception.retry = 1;
1936                         continue;
1937                 }
1938                 if (status == -EAGAIN) {
1939                         /* We must have found a delegation */
1940                         exception.retry = 1;
1941                         continue;
1942                 }
1943                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1944                                         status, &exception));
1945         } while (exception.retry);
1946         return res;
1947 }
1948
1949 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1950                             struct nfs_fattr *fattr, struct iattr *sattr,
1951                             struct nfs4_state *state)
1952 {
1953         struct nfs_server *server = NFS_SERVER(inode);
1954         struct nfs_setattrargs  arg = {
1955                 .fh             = NFS_FH(inode),
1956                 .iap            = sattr,
1957                 .server         = server,
1958                 .bitmask = server->attr_bitmask,
1959         };
1960         struct nfs_setattrres  res = {
1961                 .fattr          = fattr,
1962                 .server         = server,
1963         };
1964         struct rpc_message msg = {
1965                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1966                 .rpc_argp       = &arg,
1967                 .rpc_resp       = &res,
1968                 .rpc_cred       = cred,
1969         };
1970         unsigned long timestamp = jiffies;
1971         int status;
1972
1973         nfs_fattr_init(fattr);
1974
1975         if (state != NULL) {
1976                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1977                                 current->files, current->tgid);
1978         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1979                                 FMODE_WRITE)) {
1980                 /* Use that stateid */
1981         } else
1982                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1983
1984         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1985         if (status == 0 && state != NULL)
1986                 renew_lease(server, timestamp);
1987         return status;
1988 }
1989
1990 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1991                            struct nfs_fattr *fattr, struct iattr *sattr,
1992                            struct nfs4_state *state)
1993 {
1994         struct nfs_server *server = NFS_SERVER(inode);
1995         struct nfs4_exception exception = {
1996                 .state = state,
1997                 .inode = inode,
1998         };
1999         int err;
2000         do {
2001                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2002                 switch (err) {
2003                 case -NFS4ERR_OPENMODE:
2004                         if (state && !(state->state & FMODE_WRITE)) {
2005                                 err = -EBADF;
2006                                 if (sattr->ia_valid & ATTR_OPEN)
2007                                         err = -EACCES;
2008                                 goto out;
2009                         }
2010                 }
2011                 err = nfs4_handle_exception(server, err, &exception);
2012         } while (exception.retry);
2013 out:
2014         return err;
2015 }
2016
2017 struct nfs4_closedata {
2018         struct inode *inode;
2019         struct nfs4_state *state;
2020         struct nfs_closeargs arg;
2021         struct nfs_closeres res;
2022         struct nfs_fattr fattr;
2023         unsigned long timestamp;
2024         bool roc;
2025         u32 roc_barrier;
2026 };
2027
2028 static void nfs4_free_closedata(void *data)
2029 {
2030         struct nfs4_closedata *calldata = data;
2031         struct nfs4_state_owner *sp = calldata->state->owner;
2032         struct super_block *sb = calldata->state->inode->i_sb;
2033
2034         if (calldata->roc)
2035                 pnfs_roc_release(calldata->state->inode);
2036         nfs4_put_open_state(calldata->state);
2037         nfs_free_seqid(calldata->arg.seqid);
2038         nfs4_put_state_owner(sp);
2039         nfs_sb_deactive(sb);
2040         kfree(calldata);
2041 }
2042
2043 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2044                 fmode_t fmode)
2045 {
2046         spin_lock(&state->owner->so_lock);
2047         if (!(fmode & FMODE_READ))
2048                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2049         if (!(fmode & FMODE_WRITE))
2050                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2051         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2052         spin_unlock(&state->owner->so_lock);
2053 }
2054
2055 static void nfs4_close_done(struct rpc_task *task, void *data)
2056 {
2057         struct nfs4_closedata *calldata = data;
2058         struct nfs4_state *state = calldata->state;
2059         struct nfs_server *server = NFS_SERVER(calldata->inode);
2060
2061         dprintk("%s: begin!\n", __func__);
2062         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2063                 return;
2064         /* hmm. we are done with the inode, and in the process of freeing
2065          * the state_owner. we keep this around to process errors
2066          */
2067         switch (task->tk_status) {
2068                 case 0:
2069                         if (calldata->roc)
2070                                 pnfs_roc_set_barrier(state->inode,
2071                                                      calldata->roc_barrier);
2072                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2073                         renew_lease(server, calldata->timestamp);
2074                         nfs4_close_clear_stateid_flags(state,
2075                                         calldata->arg.fmode);
2076                         break;
2077                 case -NFS4ERR_STALE_STATEID:
2078                 case -NFS4ERR_OLD_STATEID:
2079                 case -NFS4ERR_BAD_STATEID:
2080                 case -NFS4ERR_EXPIRED:
2081                         if (calldata->arg.fmode == 0)
2082                                 break;
2083                 default:
2084                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2085                                 rpc_restart_call_prepare(task);
2086         }
2087         nfs_release_seqid(calldata->arg.seqid);
2088         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2089         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2090 }
2091
2092 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2093 {
2094         struct nfs4_closedata *calldata = data;
2095         struct nfs4_state *state = calldata->state;
2096         int call_close = 0;
2097
2098         dprintk("%s: begin!\n", __func__);
2099         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2100                 return;
2101
2102         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2103         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2104         spin_lock(&state->owner->so_lock);
2105         /* Calculate the change in open mode */
2106         if (state->n_rdwr == 0) {
2107                 if (state->n_rdonly == 0) {
2108                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2109                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2110                         calldata->arg.fmode &= ~FMODE_READ;
2111                 }
2112                 if (state->n_wronly == 0) {
2113                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2114                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2115                         calldata->arg.fmode &= ~FMODE_WRITE;
2116                 }
2117         }
2118         spin_unlock(&state->owner->so_lock);
2119
2120         if (!call_close) {
2121                 /* Note: exit _without_ calling nfs4_close_done */
2122                 task->tk_action = NULL;
2123                 goto out;
2124         }
2125
2126         if (calldata->arg.fmode == 0) {
2127                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2128                 if (calldata->roc &&
2129                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2130                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2131                                      task, NULL);
2132                         goto out;
2133                 }
2134         }
2135
2136         nfs_fattr_init(calldata->res.fattr);
2137         calldata->timestamp = jiffies;
2138         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2139                                 &calldata->arg.seq_args,
2140                                 &calldata->res.seq_res,
2141                                 task))
2142                 goto out;
2143         rpc_call_start(task);
2144 out:
2145         dprintk("%s: done!\n", __func__);
2146 }
2147
2148 static const struct rpc_call_ops nfs4_close_ops = {
2149         .rpc_call_prepare = nfs4_close_prepare,
2150         .rpc_call_done = nfs4_close_done,
2151         .rpc_release = nfs4_free_closedata,
2152 };
2153
2154 /*
2155  * It is possible for data to be read/written from a mem-mapped file
2156  * after the sys_close call (which hits the vfs layer as a flush).
2157  * This means that we can't safely call nfsv4 close on a file until
2158  * the inode is cleared. This in turn means that we are not good
2159  * NFSv4 citizens - we do not indicate to the server to update the file's
2160  * share state even when we are done with one of the three share
2161  * stateid's in the inode.
2162  *
2163  * NOTE: Caller must be holding the sp->so_owner semaphore!
2164  */
2165 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2166 {
2167         struct nfs_server *server = NFS_SERVER(state->inode);
2168         struct nfs4_closedata *calldata;
2169         struct nfs4_state_owner *sp = state->owner;
2170         struct rpc_task *task;
2171         struct rpc_message msg = {
2172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2173                 .rpc_cred = state->owner->so_cred,
2174         };
2175         struct rpc_task_setup task_setup_data = {
2176                 .rpc_client = server->client,
2177                 .rpc_message = &msg,
2178                 .callback_ops = &nfs4_close_ops,
2179                 .workqueue = nfsiod_workqueue,
2180                 .flags = RPC_TASK_ASYNC,
2181         };
2182         int status = -ENOMEM;
2183
2184         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2185         if (calldata == NULL)
2186                 goto out;
2187         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2188         calldata->inode = state->inode;
2189         calldata->state = state;
2190         calldata->arg.fh = NFS_FH(state->inode);
2191         calldata->arg.stateid = &state->open_stateid;
2192         /* Serialization for the sequence id */
2193         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2194         if (calldata->arg.seqid == NULL)
2195                 goto out_free_calldata;
2196         calldata->arg.fmode = 0;
2197         calldata->arg.bitmask = server->cache_consistency_bitmask;
2198         calldata->res.fattr = &calldata->fattr;
2199         calldata->res.seqid = calldata->arg.seqid;
2200         calldata->res.server = server;
2201         calldata->roc = roc;
2202         nfs_sb_active(calldata->inode->i_sb);
2203
2204         msg.rpc_argp = &calldata->arg;
2205         msg.rpc_resp = &calldata->res;
2206         task_setup_data.callback_data = calldata;
2207         task = rpc_run_task(&task_setup_data);
2208         if (IS_ERR(task))
2209                 return PTR_ERR(task);
2210         status = 0;
2211         if (wait)
2212                 status = rpc_wait_for_completion_task(task);
2213         rpc_put_task(task);
2214         return status;
2215 out_free_calldata:
2216         kfree(calldata);
2217 out:
2218         if (roc)
2219                 pnfs_roc_release(state->inode);
2220         nfs4_put_open_state(state);
2221         nfs4_put_state_owner(sp);
2222         return status;
2223 }
2224
2225 static struct inode *
2226 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2227 {
2228         struct nfs4_state *state;
2229
2230         /* Protect against concurrent sillydeletes */
2231         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2232                              ctx->cred, &ctx->mdsthreshold);
2233         if (IS_ERR(state))
2234                 return ERR_CAST(state);
2235         ctx->state = state;
2236         return igrab(state->inode);
2237 }
2238
2239 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2240 {
2241         if (ctx->state == NULL)
2242                 return;
2243         if (is_sync)
2244                 nfs4_close_sync(ctx->state, ctx->mode);
2245         else
2246                 nfs4_close_state(ctx->state, ctx->mode);
2247 }
2248
2249 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2250 {
2251         struct nfs4_server_caps_arg args = {
2252                 .fhandle = fhandle,
2253         };
2254         struct nfs4_server_caps_res res = {};
2255         struct rpc_message msg = {
2256                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2257                 .rpc_argp = &args,
2258                 .rpc_resp = &res,
2259         };
2260         int status;
2261
2262         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2263         if (status == 0) {
2264                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2265                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2266                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2267                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2268                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2269                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2270                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2271                         server->caps |= NFS_CAP_ACLS;
2272                 if (res.has_links != 0)
2273                         server->caps |= NFS_CAP_HARDLINKS;
2274                 if (res.has_symlinks != 0)
2275                         server->caps |= NFS_CAP_SYMLINKS;
2276                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2277                         server->caps |= NFS_CAP_FILEID;
2278                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2279                         server->caps |= NFS_CAP_MODE;
2280                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2281                         server->caps |= NFS_CAP_NLINK;
2282                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2283                         server->caps |= NFS_CAP_OWNER;
2284                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2285                         server->caps |= NFS_CAP_OWNER_GROUP;
2286                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2287                         server->caps |= NFS_CAP_ATIME;
2288                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2289                         server->caps |= NFS_CAP_CTIME;
2290                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2291                         server->caps |= NFS_CAP_MTIME;
2292
2293                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2294                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2295                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2296                 server->acl_bitmask = res.acl_bitmask;
2297                 server->fh_expire_type = res.fh_expire_type;
2298         }
2299
2300         return status;
2301 }
2302
2303 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2304 {
2305         struct nfs4_exception exception = { };
2306         int err;
2307         do {
2308                 err = nfs4_handle_exception(server,
2309                                 _nfs4_server_capabilities(server, fhandle),
2310                                 &exception);
2311         } while (exception.retry);
2312         return err;
2313 }
2314
2315 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2316                 struct nfs_fsinfo *info)
2317 {
2318         struct nfs4_lookup_root_arg args = {
2319                 .bitmask = nfs4_fattr_bitmap,
2320         };
2321         struct nfs4_lookup_res res = {
2322                 .server = server,
2323                 .fattr = info->fattr,
2324                 .fh = fhandle,
2325         };
2326         struct rpc_message msg = {
2327                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2328                 .rpc_argp = &args,
2329                 .rpc_resp = &res,
2330         };
2331
2332         nfs_fattr_init(info->fattr);
2333         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2334 }
2335
2336 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2337                 struct nfs_fsinfo *info)
2338 {
2339         struct nfs4_exception exception = { };
2340         int err;
2341         do {
2342                 err = _nfs4_lookup_root(server, fhandle, info);
2343                 switch (err) {
2344                 case 0:
2345                 case -NFS4ERR_WRONGSEC:
2346                         goto out;
2347                 default:
2348                         err = nfs4_handle_exception(server, err, &exception);
2349                 }
2350         } while (exception.retry);
2351 out:
2352         return err;
2353 }
2354
2355 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2356                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2357 {
2358         struct rpc_auth *auth;
2359         int ret;
2360
2361         auth = rpcauth_create(flavor, server->client);
2362         if (!auth) {
2363                 ret = -EIO;
2364                 goto out;
2365         }
2366         ret = nfs4_lookup_root(server, fhandle, info);
2367 out:
2368         return ret;
2369 }
2370
2371 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2372                               struct nfs_fsinfo *info)
2373 {
2374         int i, len, status = 0;
2375         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2376
2377         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2378         flav_array[len] = RPC_AUTH_NULL;
2379         len += 1;
2380
2381         for (i = 0; i < len; i++) {
2382                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2383                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2384                         continue;
2385                 break;
2386         }
2387         /*
2388          * -EACCESS could mean that the user doesn't have correct permissions
2389          * to access the mount.  It could also mean that we tried to mount
2390          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2391          * existing mount programs don't handle -EACCES very well so it should
2392          * be mapped to -EPERM instead.
2393          */
2394         if (status == -EACCES)
2395                 status = -EPERM;
2396         return status;
2397 }
2398
2399 /*
2400  * get the file handle for the "/" directory on the server
2401  */
2402 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2403                          struct nfs_fsinfo *info)
2404 {
2405         int minor_version = server->nfs_client->cl_minorversion;
2406         int status = nfs4_lookup_root(server, fhandle, info);
2407         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2408                 /*
2409                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2410                  * by nfs4_map_errors() as this function exits.
2411                  */
2412                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2413         if (status == 0)
2414                 status = nfs4_server_capabilities(server, fhandle);
2415         if (status == 0)
2416                 status = nfs4_do_fsinfo(server, fhandle, info);
2417         return nfs4_map_errors(status);
2418 }
2419
2420 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2421                               struct nfs_fsinfo *info)
2422 {
2423         int error;
2424         struct nfs_fattr *fattr = info->fattr;
2425
2426         error = nfs4_server_capabilities(server, mntfh);
2427         if (error < 0) {
2428                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2429                 return error;
2430         }
2431
2432         error = nfs4_proc_getattr(server, mntfh, fattr);
2433         if (error < 0) {
2434                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2435                 return error;
2436         }
2437
2438         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2439             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2440                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2441
2442         return error;
2443 }
2444
2445 /*
2446  * Get locations and (maybe) other attributes of a referral.
2447  * Note that we'll actually follow the referral later when
2448  * we detect fsid mismatch in inode revalidation
2449  */
2450 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2451                              const struct qstr *name, struct nfs_fattr *fattr,
2452                              struct nfs_fh *fhandle)
2453 {
2454         int status = -ENOMEM;
2455         struct page *page = NULL;
2456         struct nfs4_fs_locations *locations = NULL;
2457
2458         page = alloc_page(GFP_KERNEL);
2459         if (page == NULL)
2460                 goto out;
2461         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2462         if (locations == NULL)
2463                 goto out;
2464
2465         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2466         if (status != 0)
2467                 goto out;
2468         /* Make sure server returned a different fsid for the referral */
2469         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2470                 dprintk("%s: server did not return a different fsid for"
2471                         " a referral at %s\n", __func__, name->name);
2472                 status = -EIO;
2473                 goto out;
2474         }
2475         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2476         nfs_fixup_referral_attributes(&locations->fattr);
2477
2478         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2479         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2480         memset(fhandle, 0, sizeof(struct nfs_fh));
2481 out:
2482         if (page)
2483                 __free_page(page);
2484         kfree(locations);
2485         return status;
2486 }
2487
2488 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2489 {
2490         struct nfs4_getattr_arg args = {
2491                 .fh = fhandle,
2492                 .bitmask = server->attr_bitmask,
2493         };
2494         struct nfs4_getattr_res res = {
2495                 .fattr = fattr,
2496                 .server = server,
2497         };
2498         struct rpc_message msg = {
2499                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2500                 .rpc_argp = &args,
2501                 .rpc_resp = &res,
2502         };
2503
2504         nfs_fattr_init(fattr);
2505         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2506 }
2507
2508 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2509 {
2510         struct nfs4_exception exception = { };
2511         int err;
2512         do {
2513                 err = nfs4_handle_exception(server,
2514                                 _nfs4_proc_getattr(server, fhandle, fattr),
2515                                 &exception);
2516         } while (exception.retry);
2517         return err;
2518 }
2519
2520 /*
2521  * The file is not closed if it is opened due to the a request to change
2522  * the size of the file. The open call will not be needed once the
2523  * VFS layer lookup-intents are implemented.
2524  *
2525  * Close is called when the inode is destroyed.
2526  * If we haven't opened the file for O_WRONLY, we
2527  * need to in the size_change case to obtain a stateid.
2528  *
2529  * Got race?
2530  * Because OPEN is always done by name in nfsv4, it is
2531  * possible that we opened a different file by the same
2532  * name.  We can recognize this race condition, but we
2533  * can't do anything about it besides returning an error.
2534  *
2535  * This will be fixed with VFS changes (lookup-intent).
2536  */
2537 static int
2538 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2539                   struct iattr *sattr)
2540 {
2541         struct inode *inode = dentry->d_inode;
2542         struct rpc_cred *cred = NULL;
2543         struct nfs4_state *state = NULL;
2544         int status;
2545
2546         if (pnfs_ld_layoutret_on_setattr(inode))
2547                 pnfs_return_layout(inode);
2548
2549         nfs_fattr_init(fattr);
2550
2551         /* Search for an existing open(O_WRITE) file */
2552         if (sattr->ia_valid & ATTR_FILE) {
2553                 struct nfs_open_context *ctx;
2554
2555                 ctx = nfs_file_open_context(sattr->ia_file);
2556                 if (ctx) {
2557                         cred = ctx->cred;
2558                         state = ctx->state;
2559                 }
2560         }
2561
2562         /* Deal with open(O_TRUNC) */
2563         if (sattr->ia_valid & ATTR_OPEN)
2564                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2565
2566         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2567         if (status == 0)
2568                 nfs_setattr_update_inode(inode, sattr);
2569         return status;
2570 }
2571
2572 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2573                 const struct qstr *name, struct nfs_fh *fhandle,
2574                 struct nfs_fattr *fattr)
2575 {
2576         struct nfs_server *server = NFS_SERVER(dir);
2577         int                    status;
2578         struct nfs4_lookup_arg args = {
2579                 .bitmask = server->attr_bitmask,
2580                 .dir_fh = NFS_FH(dir),
2581                 .name = name,
2582         };
2583         struct nfs4_lookup_res res = {
2584                 .server = server,
2585                 .fattr = fattr,
2586                 .fh = fhandle,
2587         };
2588         struct rpc_message msg = {
2589                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2590                 .rpc_argp = &args,
2591                 .rpc_resp = &res,
2592         };
2593
2594         nfs_fattr_init(fattr);
2595
2596         dprintk("NFS call  lookup %s\n", name->name);
2597         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2598         dprintk("NFS reply lookup: %d\n", status);
2599         return status;
2600 }
2601
2602 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2603 {
2604         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2605                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2606         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2607         fattr->nlink = 2;
2608 }
2609
2610 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2611                                    struct qstr *name, struct nfs_fh *fhandle,
2612                                    struct nfs_fattr *fattr)
2613 {
2614         struct nfs4_exception exception = { };
2615         struct rpc_clnt *client = *clnt;
2616         int err;
2617         do {
2618                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2619                 switch (err) {
2620                 case -NFS4ERR_BADNAME:
2621                         err = -ENOENT;
2622                         goto out;
2623                 case -NFS4ERR_MOVED:
2624                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2625                         goto out;
2626                 case -NFS4ERR_WRONGSEC:
2627                         err = -EPERM;
2628                         if (client != *clnt)
2629                                 goto out;
2630
2631                         client = nfs4_create_sec_client(client, dir, name);
2632                         if (IS_ERR(client))
2633                                 return PTR_ERR(client);
2634
2635                         exception.retry = 1;
2636                         break;
2637                 default:
2638                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2639                 }
2640         } while (exception.retry);
2641
2642 out:
2643         if (err == 0)
2644                 *clnt = client;
2645         else if (client != *clnt)
2646                 rpc_shutdown_client(client);
2647
2648         return err;
2649 }
2650
2651 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2652                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2653 {
2654         int status;
2655         struct rpc_clnt *client = NFS_CLIENT(dir);
2656
2657         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2658         if (client != NFS_CLIENT(dir)) {
2659                 rpc_shutdown_client(client);
2660                 nfs_fixup_secinfo_attributes(fattr);
2661         }
2662         return status;
2663 }
2664
2665 struct rpc_clnt *
2666 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2667                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2668 {
2669         int status;
2670         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2671
2672         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2673         if (status < 0) {
2674                 rpc_shutdown_client(client);
2675                 return ERR_PTR(status);
2676         }
2677         return client;
2678 }
2679
2680 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2681 {
2682         struct nfs_server *server = NFS_SERVER(inode);
2683         struct nfs4_accessargs args = {
2684                 .fh = NFS_FH(inode),
2685                 .bitmask = server->cache_consistency_bitmask,
2686         };
2687         struct nfs4_accessres res = {
2688                 .server = server,
2689         };
2690         struct rpc_message msg = {
2691                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2692                 .rpc_argp = &args,
2693                 .rpc_resp = &res,
2694                 .rpc_cred = entry->cred,
2695         };
2696         int mode = entry->mask;
2697         int status;
2698
2699         /*
2700          * Determine which access bits we want to ask for...
2701          */
2702         if (mode & MAY_READ)
2703                 args.access |= NFS4_ACCESS_READ;
2704         if (S_ISDIR(inode->i_mode)) {
2705                 if (mode & MAY_WRITE)
2706                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2707                 if (mode & MAY_EXEC)
2708                         args.access |= NFS4_ACCESS_LOOKUP;
2709         } else {
2710                 if (mode & MAY_WRITE)
2711                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2712                 if (mode & MAY_EXEC)
2713                         args.access |= NFS4_ACCESS_EXECUTE;
2714         }
2715
2716         res.fattr = nfs_alloc_fattr();
2717         if (res.fattr == NULL)
2718                 return -ENOMEM;
2719
2720         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2721         if (!status) {
2722                 entry->mask = 0;
2723                 if (res.access & NFS4_ACCESS_READ)
2724                         entry->mask |= MAY_READ;
2725                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2726                         entry->mask |= MAY_WRITE;
2727                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2728                         entry->mask |= MAY_EXEC;
2729                 nfs_refresh_inode(inode, res.fattr);
2730         }
2731         nfs_free_fattr(res.fattr);
2732         return status;
2733 }
2734
2735 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2736 {
2737         struct nfs4_exception exception = { };
2738         int err;
2739         do {
2740                 err = nfs4_handle_exception(NFS_SERVER(inode),
2741                                 _nfs4_proc_access(inode, entry),
2742                                 &exception);
2743         } while (exception.retry);
2744         return err;
2745 }
2746
2747 /*
2748  * TODO: For the time being, we don't try to get any attributes
2749  * along with any of the zero-copy operations READ, READDIR,
2750  * READLINK, WRITE.
2751  *
2752  * In the case of the first three, we want to put the GETATTR
2753  * after the read-type operation -- this is because it is hard
2754  * to predict the length of a GETATTR response in v4, and thus
2755  * align the READ data correctly.  This means that the GETATTR
2756  * may end up partially falling into the page cache, and we should
2757  * shift it into the 'tail' of the xdr_buf before processing.
2758  * To do this efficiently, we need to know the total length
2759  * of data received, which doesn't seem to be available outside
2760  * of the RPC layer.
2761  *
2762  * In the case of WRITE, we also want to put the GETATTR after
2763  * the operation -- in this case because we want to make sure
2764  * we get the post-operation mtime and size.  This means that
2765  * we can't use xdr_encode_pages() as written: we need a variant
2766  * of it which would leave room in the 'tail' iovec.
2767  *
2768  * Both of these changes to the XDR layer would in fact be quite
2769  * minor, but I decided to leave them for a subsequent patch.
2770  */
2771 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2772                 unsigned int pgbase, unsigned int pglen)
2773 {
2774         struct nfs4_readlink args = {
2775                 .fh       = NFS_FH(inode),
2776                 .pgbase   = pgbase,
2777                 .pglen    = pglen,
2778                 .pages    = &page,
2779         };
2780         struct nfs4_readlink_res res;
2781         struct rpc_message msg = {
2782                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2783                 .rpc_argp = &args,
2784                 .rpc_resp = &res,
2785         };
2786
2787         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2788 }
2789
2790 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2791                 unsigned int pgbase, unsigned int pglen)
2792 {
2793         struct nfs4_exception exception = { };
2794         int err;
2795         do {
2796                 err = nfs4_handle_exception(NFS_SERVER(inode),
2797                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2798                                 &exception);
2799         } while (exception.retry);
2800         return err;
2801 }
2802
2803 /*
2804  * Got race?
2805  * We will need to arrange for the VFS layer to provide an atomic open.
2806  * Until then, this create/open method is prone to inefficiency and race
2807  * conditions due to the lookup, create, and open VFS calls from sys_open()
2808  * placed on the wire.
2809  *
2810  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2811  * The file will be opened again in the subsequent VFS open call
2812  * (nfs4_proc_file_open).
2813  *
2814  * The open for read will just hang around to be used by any process that
2815  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2816  */
2817
2818 static int
2819 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2820                  int flags, struct nfs_open_context *ctx)
2821 {
2822         struct dentry *de = dentry;
2823         struct nfs4_state *state;
2824         struct rpc_cred *cred = NULL;
2825         fmode_t fmode = 0;
2826         int status = 0;
2827
2828         if (ctx != NULL) {
2829                 cred = ctx->cred;
2830                 de = ctx->dentry;
2831                 fmode = ctx->mode;
2832         }
2833         sattr->ia_mode &= ~current_umask();
2834         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred, NULL);
2835         d_drop(dentry);
2836         if (IS_ERR(state)) {
2837                 status = PTR_ERR(state);
2838                 goto out;
2839         }
2840         d_add(dentry, igrab(state->inode));
2841         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2842         if (ctx != NULL)
2843                 ctx->state = state;
2844         else
2845                 nfs4_close_sync(state, fmode);
2846 out:
2847         return status;
2848 }
2849
2850 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2851 {
2852         struct nfs_server *server = NFS_SERVER(dir);
2853         struct nfs_removeargs args = {
2854                 .fh = NFS_FH(dir),
2855                 .name = *name,
2856         };
2857         struct nfs_removeres res = {
2858                 .server = server,
2859         };
2860         struct rpc_message msg = {
2861                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2862                 .rpc_argp = &args,
2863                 .rpc_resp = &res,
2864         };
2865         int status;
2866
2867         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2868         if (status == 0)
2869                 update_changeattr(dir, &res.cinfo);
2870         return status;
2871 }
2872
2873 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2874 {
2875         struct nfs4_exception exception = { };
2876         int err;
2877         do {
2878                 err = nfs4_handle_exception(NFS_SERVER(dir),
2879                                 _nfs4_proc_remove(dir, name),
2880                                 &exception);
2881         } while (exception.retry);
2882         return err;
2883 }
2884
2885 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2886 {
2887         struct nfs_server *server = NFS_SERVER(dir);
2888         struct nfs_removeargs *args = msg->rpc_argp;
2889         struct nfs_removeres *res = msg->rpc_resp;
2890
2891         res->server = server;
2892         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2893         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2894 }
2895
2896 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2897 {
2898         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2899                                 &data->args.seq_args,
2900                                 &data->res.seq_res,
2901                                 task))
2902                 return;
2903         rpc_call_start(task);
2904 }
2905
2906 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2907 {
2908         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2909
2910         if (!nfs4_sequence_done(task, &res->seq_res))
2911                 return 0;
2912         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2913                 return 0;
2914         update_changeattr(dir, &res->cinfo);
2915         return 1;
2916 }
2917
2918 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2919 {
2920         struct nfs_server *server = NFS_SERVER(dir);
2921         struct nfs_renameargs *arg = msg->rpc_argp;
2922         struct nfs_renameres *res = msg->rpc_resp;
2923
2924         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2925         res->server = server;
2926         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2927 }
2928
2929 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2930 {
2931         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2932                                 &data->args.seq_args,
2933                                 &data->res.seq_res,
2934                                 task))
2935                 return;
2936         rpc_call_start(task);
2937 }
2938
2939 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2940                                  struct inode *new_dir)
2941 {
2942         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2943
2944         if (!nfs4_sequence_done(task, &res->seq_res))
2945                 return 0;
2946         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2947                 return 0;
2948
2949         update_changeattr(old_dir, &res->old_cinfo);
2950         update_changeattr(new_dir, &res->new_cinfo);
2951         return 1;
2952 }
2953
2954 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2955                 struct inode *new_dir, struct qstr *new_name)
2956 {
2957         struct nfs_server *server = NFS_SERVER(old_dir);
2958         struct nfs_renameargs arg = {
2959                 .old_dir = NFS_FH(old_dir),
2960                 .new_dir = NFS_FH(new_dir),
2961                 .old_name = old_name,
2962                 .new_name = new_name,
2963         };
2964         struct nfs_renameres res = {
2965                 .server = server,
2966         };
2967         struct rpc_message msg = {
2968                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2969                 .rpc_argp = &arg,
2970                 .rpc_resp = &res,
2971         };
2972         int status = -ENOMEM;
2973
2974         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2975         if (!status) {
2976                 update_changeattr(old_dir, &res.old_cinfo);
2977                 update_changeattr(new_dir, &res.new_cinfo);
2978         }
2979         return status;
2980 }
2981
2982 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2983                 struct inode *new_dir, struct qstr *new_name)
2984 {
2985         struct nfs4_exception exception = { };
2986         int err;
2987         do {
2988                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2989                                 _nfs4_proc_rename(old_dir, old_name,
2990                                         new_dir, new_name),
2991                                 &exception);
2992         } while (exception.retry);
2993         return err;
2994 }
2995
2996 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2997 {
2998         struct nfs_server *server = NFS_SERVER(inode);
2999         struct nfs4_link_arg arg = {
3000                 .fh     = NFS_FH(inode),
3001                 .dir_fh = NFS_FH(dir),
3002                 .name   = name,
3003                 .bitmask = server->attr_bitmask,
3004         };
3005         struct nfs4_link_res res = {
3006                 .server = server,
3007         };
3008         struct rpc_message msg = {
3009                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3010                 .rpc_argp = &arg,
3011                 .rpc_resp = &res,
3012         };
3013         int status = -ENOMEM;
3014
3015         res.fattr = nfs_alloc_fattr();
3016         if (res.fattr == NULL)
3017                 goto out;
3018
3019         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3020         if (!status) {
3021                 update_changeattr(dir, &res.cinfo);
3022                 nfs_post_op_update_inode(inode, res.fattr);
3023         }
3024 out:
3025         nfs_free_fattr(res.fattr);
3026         return status;
3027 }
3028
3029 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3030 {
3031         struct nfs4_exception exception = { };
3032         int err;
3033         do {
3034                 err = nfs4_handle_exception(NFS_SERVER(inode),
3035                                 _nfs4_proc_link(inode, dir, name),
3036                                 &exception);
3037         } while (exception.retry);
3038         return err;
3039 }
3040
3041 struct nfs4_createdata {
3042         struct rpc_message msg;
3043         struct nfs4_create_arg arg;
3044         struct nfs4_create_res res;
3045         struct nfs_fh fh;
3046         struct nfs_fattr fattr;
3047 };
3048
3049 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3050                 struct qstr *name, struct iattr *sattr, u32 ftype)
3051 {
3052         struct nfs4_createdata *data;
3053
3054         data = kzalloc(sizeof(*data), GFP_KERNEL);
3055         if (data != NULL) {
3056                 struct nfs_server *server = NFS_SERVER(dir);
3057
3058                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3059                 data->msg.rpc_argp = &data->arg;
3060                 data->msg.rpc_resp = &data->res;
3061                 data->arg.dir_fh = NFS_FH(dir);
3062                 data->arg.server = server;
3063                 data->arg.name = name;
3064                 data->arg.attrs = sattr;
3065                 data->arg.ftype = ftype;
3066                 data->arg.bitmask = server->attr_bitmask;
3067                 data->res.server = server;
3068                 data->res.fh = &data->fh;
3069                 data->res.fattr = &data->fattr;
3070                 nfs_fattr_init(data->res.fattr);
3071         }
3072         return data;
3073 }
3074
3075 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3076 {
3077         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3078                                     &data->arg.seq_args, &data->res.seq_res, 1);
3079         if (status == 0) {
3080                 update_changeattr(dir, &data->res.dir_cinfo);
3081                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3082         }
3083         return status;
3084 }
3085
3086 static void nfs4_free_createdata(struct nfs4_createdata *data)
3087 {
3088         kfree(data);
3089 }
3090
3091 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3092                 struct page *page, unsigned int len, struct iattr *sattr)
3093 {
3094         struct nfs4_createdata *data;
3095         int status = -ENAMETOOLONG;
3096
3097         if (len > NFS4_MAXPATHLEN)
3098                 goto out;
3099
3100         status = -ENOMEM;
3101         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3102         if (data == NULL)
3103                 goto out;
3104
3105         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3106         data->arg.u.symlink.pages = &page;
3107         data->arg.u.symlink.len = len;
3108
3109         status = nfs4_do_create(dir, dentry, data);
3110
3111         nfs4_free_createdata(data);
3112 out:
3113         return status;
3114 }
3115
3116 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3117                 struct page *page, unsigned int len, struct iattr *sattr)
3118 {
3119         struct nfs4_exception exception = { };
3120         int err;
3121         do {
3122                 err = nfs4_handle_exception(NFS_SERVER(dir),
3123                                 _nfs4_proc_symlink(dir, dentry, page,
3124                                                         len, sattr),
3125                                 &exception);
3126         } while (exception.retry);
3127         return err;
3128 }
3129
3130 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3131                 struct iattr *sattr)
3132 {
3133         struct nfs4_createdata *data;
3134         int status = -ENOMEM;
3135
3136         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3137         if (data == NULL)
3138                 goto out;
3139
3140         status = nfs4_do_create(dir, dentry, data);
3141
3142         nfs4_free_createdata(data);
3143 out:
3144         return status;
3145 }
3146
3147 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3148                 struct iattr *sattr)
3149 {
3150         struct nfs4_exception exception = { };
3151         int err;
3152
3153         sattr->ia_mode &= ~current_umask();
3154         do {
3155                 err = nfs4_handle_exception(NFS_SERVER(dir),
3156                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3157                                 &exception);
3158         } while (exception.retry);
3159         return err;
3160 }
3161
3162 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3163                 u64 cookie, struct page **pages, unsigned int count, int plus)
3164 {
3165         struct inode            *dir = dentry->d_inode;
3166         struct nfs4_readdir_arg args = {
3167                 .fh = NFS_FH(dir),
3168                 .pages = pages,
3169                 .pgbase = 0,
3170                 .count = count,
3171                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3172                 .plus = plus,
3173         };
3174         struct nfs4_readdir_res res;
3175         struct rpc_message msg = {
3176                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3177                 .rpc_argp = &args,
3178                 .rpc_resp = &res,
3179                 .rpc_cred = cred,
3180         };
3181         int                     status;
3182
3183         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3184                         dentry->d_parent->d_name.name,
3185                         dentry->d_name.name,
3186                         (unsigned long long)cookie);
3187         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3188         res.pgbase = args.pgbase;
3189         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3190         if (status >= 0) {
3191                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3192                 status += args.pgbase;
3193         }
3194
3195         nfs_invalidate_atime(dir);
3196
3197         dprintk("%s: returns %d\n", __func__, status);
3198         return status;
3199 }
3200
3201 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3202                 u64 cookie, struct page **pages, unsigned int count, int plus)
3203 {
3204         struct nfs4_exception exception = { };
3205         int err;
3206         do {
3207                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3208                                 _nfs4_proc_readdir(dentry, cred, cookie,
3209                                         pages, count, plus),
3210                                 &exception);
3211         } while (exception.retry);
3212         return err;
3213 }
3214
3215 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3216                 struct iattr *sattr, dev_t rdev)
3217 {
3218         struct nfs4_createdata *data;
3219         int mode = sattr->ia_mode;
3220         int status = -ENOMEM;
3221
3222         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3223         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3224
3225         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3226         if (data == NULL)
3227                 goto out;
3228
3229         if (S_ISFIFO(mode))
3230                 data->arg.ftype = NF4FIFO;
3231         else if (S_ISBLK(mode)) {
3232                 data->arg.ftype = NF4BLK;
3233                 data->arg.u.device.specdata1 = MAJOR(rdev);
3234                 data->arg.u.device.specdata2 = MINOR(rdev);
3235         }
3236         else if (S_ISCHR(mode)) {
3237                 data->arg.ftype = NF4CHR;
3238                 data->arg.u.device.specdata1 = MAJOR(rdev);
3239                 data->arg.u.device.specdata2 = MINOR(rdev);
3240         }
3241
3242         status = nfs4_do_create(dir, dentry, data);
3243
3244         nfs4_free_createdata(data);
3245 out:
3246         return status;
3247 }
3248
3249 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3250                 struct iattr *sattr, dev_t rdev)
3251 {
3252         struct nfs4_exception exception = { };
3253         int err;
3254
3255         sattr->ia_mode &= ~current_umask();
3256         do {
3257                 err = nfs4_handle_exception(NFS_SERVER(dir),
3258                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3259                                 &exception);
3260         } while (exception.retry);
3261         return err;
3262 }
3263
3264 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3265                  struct nfs_fsstat *fsstat)
3266 {
3267         struct nfs4_statfs_arg args = {
3268                 .fh = fhandle,
3269                 .bitmask = server->attr_bitmask,
3270         };
3271         struct nfs4_statfs_res res = {
3272                 .fsstat = fsstat,
3273         };
3274         struct rpc_message msg = {
3275                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3276                 .rpc_argp = &args,
3277                 .rpc_resp = &res,
3278         };
3279
3280         nfs_fattr_init(fsstat->fattr);
3281         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3282 }
3283
3284 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3285 {
3286         struct nfs4_exception exception = { };
3287         int err;
3288         do {
3289                 err = nfs4_handle_exception(server,
3290                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3291                                 &exception);
3292         } while (exception.retry);
3293         return err;
3294 }
3295
3296 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3297                 struct nfs_fsinfo *fsinfo)
3298 {
3299         struct nfs4_fsinfo_arg args = {
3300                 .fh = fhandle,
3301                 .bitmask = server->attr_bitmask,
3302         };
3303         struct nfs4_fsinfo_res res = {
3304                 .fsinfo = fsinfo,
3305         };
3306         struct rpc_message msg = {
3307                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3308                 .rpc_argp = &args,
3309                 .rpc_resp = &res,
3310         };
3311
3312         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3313 }
3314
3315 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3316 {
3317         struct nfs4_exception exception = { };
3318         int err;
3319
3320         do {
3321                 err = nfs4_handle_exception(server,
3322                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3323                                 &exception);
3324         } while (exception.retry);
3325         return err;
3326 }
3327
3328 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3329 {
3330         nfs_fattr_init(fsinfo->fattr);
3331         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3332 }
3333
3334 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3335                 struct nfs_pathconf *pathconf)
3336 {
3337         struct nfs4_pathconf_arg args = {
3338                 .fh = fhandle,
3339                 .bitmask = server->attr_bitmask,
3340         };
3341         struct nfs4_pathconf_res res = {
3342                 .pathconf = pathconf,
3343         };
3344         struct rpc_message msg = {
3345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3346                 .rpc_argp = &args,
3347                 .rpc_resp = &res,
3348         };
3349
3350         /* None of the pathconf attributes are mandatory to implement */
3351         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3352                 memset(pathconf, 0, sizeof(*pathconf));
3353                 return 0;
3354         }
3355
3356         nfs_fattr_init(pathconf->fattr);
3357         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3358 }
3359
3360 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3361                 struct nfs_pathconf *pathconf)
3362 {
3363         struct nfs4_exception exception = { };
3364         int err;
3365
3366         do {
3367                 err = nfs4_handle_exception(server,
3368                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3369                                 &exception);
3370         } while (exception.retry);
3371         return err;
3372 }
3373
3374 void __nfs4_read_done_cb(struct nfs_read_data *data)
3375 {
3376         nfs_invalidate_atime(data->header->inode);
3377 }
3378
3379 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3380 {
3381         struct nfs_server *server = NFS_SERVER(data->header->inode);
3382
3383         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3384                 rpc_restart_call_prepare(task);
3385                 return -EAGAIN;
3386         }
3387
3388         __nfs4_read_done_cb(data);
3389         if (task->tk_status > 0)
3390                 renew_lease(server, data->timestamp);
3391         return 0;
3392 }
3393
3394 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3395 {
3396
3397         dprintk("--> %s\n", __func__);
3398
3399         if (!nfs4_sequence_done(task, &data->res.seq_res))
3400                 return -EAGAIN;
3401
3402         return data->read_done_cb ? data->read_done_cb(task, data) :
3403                                     nfs4_read_done_cb(task, data);
3404 }
3405
3406 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3407 {
3408         data->timestamp   = jiffies;
3409         data->read_done_cb = nfs4_read_done_cb;
3410         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3411         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3412 }
3413
3414 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3415 {
3416         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3417                                 &data->args.seq_args,
3418                                 &data->res.seq_res,
3419                                 task))
3420                 return;
3421         rpc_call_start(task);
3422 }
3423
3424 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3425 {
3426         struct inode *inode = data->header->inode;
3427
3428         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3429                 rpc_restart_call_prepare(task);
3430                 return -EAGAIN;
3431         }
3432         if (task->tk_status >= 0) {
3433                 renew_lease(NFS_SERVER(inode), data->timestamp);
3434                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3435         }
3436         return 0;
3437 }
3438
3439 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3440 {
3441         if (!nfs4_sequence_done(task, &data->res.seq_res))
3442                 return -EAGAIN;
3443         return data->write_done_cb ? data->write_done_cb(task, data) :
3444                 nfs4_write_done_cb(task, data);
3445 }
3446
3447 static
3448 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3449 {
3450         const struct nfs_pgio_header *hdr = data->header;
3451
3452         /* Don't request attributes for pNFS or O_DIRECT writes */
3453         if (data->ds_clp != NULL || hdr->dreq != NULL)
3454                 return false;
3455         /* Otherwise, request attributes if and only if we don't hold
3456          * a delegation
3457          */
3458         return nfs_have_delegation(hdr->inode, FMODE_READ) == 0;
3459 }
3460
3461 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3462 {
3463         struct nfs_server *server = NFS_SERVER(data->header->inode);
3464
3465         if (!nfs4_write_need_cache_consistency_data(data)) {
3466                 data->args.bitmask = NULL;
3467                 data->res.fattr = NULL;
3468         } else
3469                 data->args.bitmask = server->cache_consistency_bitmask;
3470
3471         if (!data->write_done_cb)
3472                 data->write_done_cb = nfs4_write_done_cb;
3473         data->res.server = server;
3474         data->timestamp   = jiffies;
3475
3476         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3477         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3478 }
3479
3480 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3481 {
3482         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3483                                 &data->args.seq_args,
3484                                 &data->res.seq_res,
3485                                 task))
3486                 return;
3487         rpc_call_start(task);
3488 }
3489
3490 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3491 {
3492         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3493                                 &data->args.seq_args,
3494                                 &data->res.seq_res,
3495                                 task))
3496                 return;
3497         rpc_call_start(task);
3498 }
3499
3500 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3501 {
3502         struct inode *inode = data->inode;
3503
3504         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3505                 rpc_restart_call_prepare(task);
3506                 return -EAGAIN;
3507         }
3508         return 0;
3509 }
3510
3511 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3512 {
3513         if (!nfs4_sequence_done(task, &data->res.seq_res))
3514                 return -EAGAIN;
3515         return data->commit_done_cb(task, data);
3516 }
3517
3518 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3519 {
3520         struct nfs_server *server = NFS_SERVER(data->inode);
3521
3522         if (data->commit_done_cb == NULL)
3523                 data->commit_done_cb = nfs4_commit_done_cb;
3524         data->res.server = server;
3525         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3526         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3527 }
3528
3529 struct nfs4_renewdata {
3530         struct nfs_client       *client;
3531         unsigned long           timestamp;
3532 };
3533
3534 /*
3535  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3536  * standalone procedure for queueing an asynchronous RENEW.
3537  */
3538 static void nfs4_renew_release(void *calldata)
3539 {
3540         struct nfs4_renewdata *data = calldata;
3541         struct nfs_client *clp = data->client;
3542
3543         if (atomic_read(&clp->cl_count) > 1)
3544                 nfs4_schedule_state_renewal(clp);
3545         nfs_put_client(clp);
3546         kfree(data);
3547 }
3548
3549 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3550 {
3551         struct nfs4_renewdata *data = calldata;
3552         struct nfs_client *clp = data->client;
3553         unsigned long timestamp = data->timestamp;
3554
3555         if (task->tk_status < 0) {
3556                 /* Unless we're shutting down, schedule state recovery! */
3557                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3558                         return;
3559                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3560                         nfs4_schedule_lease_recovery(clp);
3561                         return;
3562                 }
3563                 nfs4_schedule_path_down_recovery(clp);
3564         }
3565         do_renew_lease(clp, timestamp);
3566 }
3567
3568 static const struct rpc_call_ops nfs4_renew_ops = {
3569         .rpc_call_done = nfs4_renew_done,
3570         .rpc_release = nfs4_renew_release,
3571 };
3572
3573 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3574 {
3575         struct rpc_message msg = {
3576                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3577                 .rpc_argp       = clp,
3578                 .rpc_cred       = cred,
3579         };
3580         struct nfs4_renewdata *data;
3581
3582         if (renew_flags == 0)
3583                 return 0;
3584         if (!atomic_inc_not_zero(&clp->cl_count))
3585                 return -EIO;
3586         data = kmalloc(sizeof(*data), GFP_NOFS);
3587         if (data == NULL)
3588                 return -ENOMEM;
3589         data->client = clp;
3590         data->timestamp = jiffies;
3591         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3592                         &nfs4_renew_ops, data);
3593 }
3594
3595 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3596 {
3597         struct rpc_message msg = {
3598                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3599                 .rpc_argp       = clp,
3600                 .rpc_cred       = cred,
3601         };
3602         unsigned long now = jiffies;
3603         int status;
3604
3605         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3606         if (status < 0)
3607                 return status;
3608         do_renew_lease(clp, now);
3609         return 0;
3610 }
3611
3612 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3613 {
3614         return (server->caps & NFS_CAP_ACLS)
3615                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3616                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3617 }
3618
3619 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3620  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3621  * the stack.
3622  */
3623 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3624
3625 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3626                 struct page **pages, unsigned int *pgbase)
3627 {
3628         struct page *newpage, **spages;
3629         int rc = 0;
3630         size_t len;
3631         spages = pages;
3632
3633         do {
3634                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3635                 newpage = alloc_page(GFP_KERNEL);
3636
3637                 if (newpage == NULL)
3638                         goto unwind;
3639                 memcpy(page_address(newpage), buf, len);
3640                 buf += len;
3641                 buflen -= len;
3642                 *pages++ = newpage;
3643                 rc++;
3644         } while (buflen != 0);
3645
3646         return rc;
3647
3648 unwind:
3649         for(; rc > 0; rc--)
3650                 __free_page(spages[rc-1]);
3651         return -ENOMEM;
3652 }
3653
3654 struct nfs4_cached_acl {
3655         int cached;
3656         size_t len;
3657         char data[0];
3658 };
3659
3660 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3661 {
3662         struct nfs_inode *nfsi = NFS_I(inode);
3663
3664         spin_lock(&inode->i_lock);
3665         kfree(nfsi->nfs4_acl);
3666         nfsi->nfs4_acl = acl;
3667         spin_unlock(&inode->i_lock);
3668 }
3669
3670 static void nfs4_zap_acl_attr(struct inode *inode)
3671 {
3672         nfs4_set_cached_acl(inode, NULL);
3673 }
3674
3675 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3676 {
3677         struct nfs_inode *nfsi = NFS_I(inode);
3678         struct nfs4_cached_acl *acl;
3679         int ret = -ENOENT;
3680
3681         spin_lock(&inode->i_lock);
3682         acl = nfsi->nfs4_acl;
3683         if (acl == NULL)
3684                 goto out;
3685         if (buf == NULL) /* user is just asking for length */
3686                 goto out_len;
3687         if (acl->cached == 0)
3688                 goto out;
3689         ret = -ERANGE; /* see getxattr(2) man page */
3690         if (acl->len > buflen)
3691                 goto out;
3692         memcpy(buf, acl->data, acl->len);
3693 out_len:
3694         ret = acl->len;
3695 out:
3696         spin_unlock(&inode->i_lock);
3697         return ret;
3698 }
3699
3700 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3701 {
3702         struct nfs4_cached_acl *acl;
3703
3704         if (pages && acl_len <= PAGE_SIZE) {
3705                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3706                 if (acl == NULL)
3707                         goto out;
3708                 acl->cached = 1;
3709                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3710         } else {
3711                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3712                 if (acl == NULL)
3713                         goto out;
3714                 acl->cached = 0;
3715         }
3716         acl->len = acl_len;
3717 out:
3718         nfs4_set_cached_acl(inode, acl);
3719 }
3720
3721 /*
3722  * The getxattr API returns the required buffer length when called with a
3723  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3724  * the required buf.  On a NULL buf, we send a page of data to the server
3725  * guessing that the ACL request can be serviced by a page. If so, we cache
3726  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3727  * the cache. If not so, we throw away the page, and cache the required
3728  * length. The next getxattr call will then produce another round trip to
3729  * the server, this time with the input buf of the required size.
3730  */
3731 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3732 {
3733         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3734         struct nfs_getaclargs args = {
3735                 .fh = NFS_FH(inode),
3736                 .acl_pages = pages,
3737                 .acl_len = buflen,
3738         };
3739         struct nfs_getaclres res = {
3740                 .acl_len = buflen,
3741         };
3742         struct rpc_message msg = {
3743                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3744                 .rpc_argp = &args,
3745                 .rpc_resp = &res,
3746         };
3747         int ret = -ENOMEM, npages, i, acl_len = 0;
3748
3749         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3750         /* As long as we're doing a round trip to the server anyway,
3751          * let's be prepared for a page of acl data. */
3752         if (npages == 0)
3753                 npages = 1;
3754
3755         /* Add an extra page to handle the bitmap returned */
3756         npages++;
3757
3758         for (i = 0; i < npages; i++) {
3759                 pages[i] = alloc_page(GFP_KERNEL);
3760                 if (!pages[i])
3761                         goto out_free;
3762         }
3763
3764         /* for decoding across pages */
3765         res.acl_scratch = alloc_page(GFP_KERNEL);
3766         if (!res.acl_scratch)
3767                 goto out_free;
3768
3769         args.acl_len = npages * PAGE_SIZE;
3770         args.acl_pgbase = 0;
3771
3772         /* Let decode_getfacl know not to fail if the ACL data is larger than
3773          * the page we send as a guess */
3774         if (buf == NULL)
3775                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3776
3777         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3778                 __func__, buf, buflen, npages, args.acl_len);
3779         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3780                              &msg, &args.seq_args, &res.seq_res, 0);
3781         if (ret)
3782                 goto out_free;
3783
3784         acl_len = res.acl_len - res.acl_data_offset;
3785         if (acl_len > args.acl_len)
3786                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3787         else
3788                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3789                                       acl_len);
3790         if (buf) {
3791                 ret = -ERANGE;
3792                 if (acl_len > buflen)
3793                         goto out_free;
3794                 _copy_from_pages(buf, pages, res.acl_data_offset,
3795                                 acl_len);
3796         }
3797         ret = acl_len;
3798 out_free:
3799         for (i = 0; i < npages; i++)
3800                 if (pages[i])
3801                         __free_page(pages[i]);
3802         if (res.acl_scratch)
3803                 __free_page(res.acl_scratch);
3804         return ret;
3805 }
3806
3807 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3808 {
3809         struct nfs4_exception exception = { };
3810         ssize_t ret;
3811         do {
3812                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3813                 if (ret >= 0)
3814                         break;
3815                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3816         } while (exception.retry);
3817         return ret;
3818 }
3819
3820 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3821 {
3822         struct nfs_server *server = NFS_SERVER(inode);
3823         int ret;
3824
3825         if (!nfs4_server_supports_acls(server))
3826                 return -EOPNOTSUPP;
3827         ret = nfs_revalidate_inode(server, inode);
3828         if (ret < 0)
3829                 return ret;
3830         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3831                 nfs_zap_acl_cache(inode);
3832         ret = nfs4_read_cached_acl(inode, buf, buflen);
3833         if (ret != -ENOENT)
3834                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3835                  * but no cached acl data, just the acl length */
3836                 return ret;
3837         return nfs4_get_acl_uncached(inode, buf, buflen);
3838 }
3839
3840 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3841 {
3842         struct nfs_server *server = NFS_SERVER(inode);
3843         struct page *pages[NFS4ACL_MAXPAGES];
3844         struct nfs_setaclargs arg = {
3845                 .fh             = NFS_FH(inode),
3846                 .acl_pages      = pages,
3847                 .acl_len        = buflen,
3848         };
3849         struct nfs_setaclres res;
3850         struct rpc_message msg = {
3851                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3852                 .rpc_argp       = &arg,
3853                 .rpc_resp       = &res,
3854         };
3855         int ret, i;
3856
3857         if (!nfs4_server_supports_acls(server))
3858                 return -EOPNOTSUPP;
3859         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3860         if (i < 0)
3861                 return i;
3862         nfs_inode_return_delegation(inode);
3863         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3864
3865         /*
3866          * Free each page after tx, so the only ref left is
3867          * held by the network stack
3868          */
3869         for (; i > 0; i--)
3870                 put_page(pages[i-1]);
3871
3872         /*
3873          * Acl update can result in inode attribute update.
3874          * so mark the attribute cache invalid.
3875          */
3876         spin_lock(&inode->i_lock);
3877         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3878         spin_unlock(&inode->i_lock);
3879         nfs_access_zap_cache(inode);
3880         nfs_zap_acl_cache(inode);
3881         return ret;
3882 }
3883
3884 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3885 {
3886         struct nfs4_exception exception = { };
3887         int err;
3888         do {
3889                 err = nfs4_handle_exception(NFS_SERVER(inode),
3890                                 __nfs4_proc_set_acl(inode, buf, buflen),
3891                                 &exception);
3892         } while (exception.retry);
3893         return err;
3894 }
3895
3896 static int
3897 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3898 {
3899         struct nfs_client *clp = server->nfs_client;
3900
3901         if (task->tk_status >= 0)
3902                 return 0;
3903         switch(task->tk_status) {
3904                 case -NFS4ERR_DELEG_REVOKED:
3905                 case -NFS4ERR_ADMIN_REVOKED:
3906                 case -NFS4ERR_BAD_STATEID:
3907                         if (state == NULL)
3908                                 break;
3909                         nfs_remove_bad_delegation(state->inode);
3910                 case -NFS4ERR_OPENMODE:
3911                         if (state == NULL)
3912                                 break;
3913                         nfs4_schedule_stateid_recovery(server, state);
3914                         goto wait_on_recovery;
3915                 case -NFS4ERR_EXPIRED:
3916                         if (state != NULL)
3917                                 nfs4_schedule_stateid_recovery(server, state);
3918                 case -NFS4ERR_STALE_STATEID:
3919                 case -NFS4ERR_STALE_CLIENTID:
3920                         nfs4_schedule_lease_recovery(clp);
3921                         goto wait_on_recovery;
3922 #if defined(CONFIG_NFS_V4_1)
3923                 case -NFS4ERR_BADSESSION:
3924                 case -NFS4ERR_BADSLOT:
3925                 case -NFS4ERR_BAD_HIGH_SLOT:
3926                 case -NFS4ERR_DEADSESSION:
3927                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3928                 case -NFS4ERR_SEQ_FALSE_RETRY:
3929                 case -NFS4ERR_SEQ_MISORDERED:
3930                         dprintk("%s ERROR %d, Reset session\n", __func__,
3931                                 task->tk_status);
3932                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3933                         task->tk_status = 0;
3934                         return -EAGAIN;
3935 #endif /* CONFIG_NFS_V4_1 */
3936                 case -NFS4ERR_DELAY:
3937                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3938                 case -NFS4ERR_GRACE:
3939                 case -EKEYEXPIRED:
3940                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3941                         task->tk_status = 0;
3942                         return -EAGAIN;
3943                 case -NFS4ERR_RETRY_UNCACHED_REP:
3944                 case -NFS4ERR_OLD_STATEID:
3945                         task->tk_status = 0;
3946                         return -EAGAIN;
3947         }
3948         task->tk_status = nfs4_map_errors(task->tk_status);
3949         return 0;
3950 wait_on_recovery:
3951         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3952         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3953                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3954         task->tk_status = 0;
3955         return -EAGAIN;
3956 }
3957
3958 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3959                                     nfs4_verifier *bootverf)
3960 {
3961         __be32 verf[2];
3962
3963         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3964                 /* An impossible timestamp guarantees this value
3965                  * will never match a generated boot time. */
3966                 verf[0] = 0;
3967                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3968         } else {
3969                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3970                 verf[0] = (__be32)nn->boot_time.tv_sec;
3971                 verf[1] = (__be32)nn->boot_time.tv_nsec;
3972         }
3973         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3974 }
3975
3976 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3977                 unsigned short port, struct rpc_cred *cred,
3978                 struct nfs4_setclientid_res *res)
3979 {
3980         nfs4_verifier sc_verifier;
3981         struct nfs4_setclientid setclientid = {
3982                 .sc_verifier = &sc_verifier,
3983                 .sc_prog = program,
3984                 .sc_cb_ident = clp->cl_cb_ident,
3985         };
3986         struct rpc_message msg = {
3987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3988                 .rpc_argp = &setclientid,
3989                 .rpc_resp = res,
3990                 .rpc_cred = cred,
3991         };
3992         int loop = 0;
3993         int status;
3994
3995         nfs4_init_boot_verifier(clp, &sc_verifier);
3996
3997         for(;;) {
3998                 rcu_read_lock();
3999                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
4000                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
4001                                 clp->cl_ipaddr,
4002                                 rpc_peeraddr2str(clp->cl_rpcclient,
4003                                                         RPC_DISPLAY_ADDR),
4004                                 rpc_peeraddr2str(clp->cl_rpcclient,
4005                                                         RPC_DISPLAY_PROTO),
4006                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4007                                 clp->cl_id_uniquifier);
4008                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4009                                 sizeof(setclientid.sc_netid),
4010                                 rpc_peeraddr2str(clp->cl_rpcclient,
4011                                                         RPC_DISPLAY_NETID));
4012                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4013                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4014                                 clp->cl_ipaddr, port >> 8, port & 255);
4015                 rcu_read_unlock();
4016
4017                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4018                 if (status != -NFS4ERR_CLID_INUSE)
4019                         break;
4020                 if (loop != 0) {
4021                         ++clp->cl_id_uniquifier;
4022                         break;
4023                 }
4024                 ++loop;
4025                 ssleep(clp->cl_lease_time / HZ + 1);
4026         }
4027         return status;
4028 }
4029
4030 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4031                 struct nfs4_setclientid_res *arg,
4032                 struct rpc_cred *cred)
4033 {
4034         struct nfs_fsinfo fsinfo;
4035         struct rpc_message msg = {
4036                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4037                 .rpc_argp = arg,
4038                 .rpc_resp = &fsinfo,
4039                 .rpc_cred = cred,
4040         };
4041         unsigned long now;
4042         int status;
4043
4044         now = jiffies;
4045         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4046         if (status == 0) {
4047                 spin_lock(&clp->cl_lock);
4048                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4049                 clp->cl_last_renewal = now;
4050                 spin_unlock(&clp->cl_lock);
4051         }
4052         return status;
4053 }
4054
4055 struct nfs4_delegreturndata {
4056         struct nfs4_delegreturnargs args;
4057         struct nfs4_delegreturnres res;
4058         struct nfs_fh fh;
4059         nfs4_stateid stateid;
4060         unsigned long timestamp;
4061         struct nfs_fattr fattr;
4062         int rpc_status;
4063 };
4064
4065 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4066 {
4067         struct nfs4_delegreturndata *data = calldata;
4068
4069         if (!nfs4_sequence_done(task, &data->res.seq_res))
4070                 return;
4071
4072         switch (task->tk_status) {
4073         case -NFS4ERR_STALE_STATEID:
4074         case -NFS4ERR_EXPIRED:
4075         case 0:
4076                 renew_lease(data->res.server, data->timestamp);
4077                 break;
4078         default:
4079                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4080                                 -EAGAIN) {
4081                         rpc_restart_call_prepare(task);
4082                         return;
4083                 }
4084         }
4085         data->rpc_status = task->tk_status;
4086 }
4087
4088 static void nfs4_delegreturn_release(void *calldata)
4089 {
4090         kfree(calldata);
4091 }
4092
4093 #if defined(CONFIG_NFS_V4_1)
4094 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4095 {
4096         struct nfs4_delegreturndata *d_data;
4097
4098         d_data = (struct nfs4_delegreturndata *)data;
4099
4100         if (nfs4_setup_sequence(d_data->res.server,
4101                                 &d_data->args.seq_args,
4102                                 &d_data->res.seq_res, task))
4103                 return;
4104         rpc_call_start(task);
4105 }
4106 #endif /* CONFIG_NFS_V4_1 */
4107
4108 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4109 #if defined(CONFIG_NFS_V4_1)
4110         .rpc_call_prepare = nfs4_delegreturn_prepare,
4111 #endif /* CONFIG_NFS_V4_1 */
4112         .rpc_call_done = nfs4_delegreturn_done,
4113         .rpc_release = nfs4_delegreturn_release,
4114 };
4115
4116 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4117 {
4118         struct nfs4_delegreturndata *data;
4119         struct nfs_server *server = NFS_SERVER(inode);
4120         struct rpc_task *task;
4121         struct rpc_message msg = {
4122                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4123                 .rpc_cred = cred,
4124         };
4125         struct rpc_task_setup task_setup_data = {
4126                 .rpc_client = server->client,
4127                 .rpc_message = &msg,
4128                 .callback_ops = &nfs4_delegreturn_ops,
4129                 .flags = RPC_TASK_ASYNC,
4130         };
4131         int status = 0;
4132
4133         data = kzalloc(sizeof(*data), GFP_NOFS);
4134         if (data == NULL)
4135                 return -ENOMEM;
4136         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4137         data->args.fhandle = &data->fh;
4138         data->args.stateid = &data->stateid;
4139         data->args.bitmask = server->cache_consistency_bitmask;
4140         nfs_copy_fh(&data->fh, NFS_FH(inode));
4141         nfs4_stateid_copy(&data->stateid, stateid);
4142         data->res.fattr = &data->fattr;
4143         data->res.server = server;
4144         nfs_fattr_init(data->res.fattr);
4145         data->timestamp = jiffies;
4146         data->rpc_status = 0;
4147
4148         task_setup_data.callback_data = data;
4149         msg.rpc_argp = &data->args;
4150         msg.rpc_resp = &data->res;
4151         task = rpc_run_task(&task_setup_data);
4152         if (IS_ERR(task))
4153                 return PTR_ERR(task);
4154         if (!issync)
4155                 goto out;
4156         status = nfs4_wait_for_completion_rpc_task(task);
4157         if (status != 0)
4158                 goto out;
4159         status = data->rpc_status;
4160         if (status == 0)
4161                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4162         else
4163                 nfs_refresh_inode(inode, &data->fattr);
4164 out:
4165         rpc_put_task(task);
4166         return status;
4167 }
4168
4169 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4170 {
4171         struct nfs_server *server = NFS_SERVER(inode);
4172         struct nfs4_exception exception = { };
4173         int err;
4174         do {
4175                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4176                 switch (err) {
4177                         case -NFS4ERR_STALE_STATEID:
4178                         case -NFS4ERR_EXPIRED:
4179                         case 0:
4180                                 return 0;
4181                 }
4182                 err = nfs4_handle_exception(server, err, &exception);
4183         } while (exception.retry);
4184         return err;
4185 }
4186
4187 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4188 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4189
4190 /*
4191  * sleep, with exponential backoff, and retry the LOCK operation.
4192  */
4193 static unsigned long
4194 nfs4_set_lock_task_retry(unsigned long timeout)
4195 {
4196         freezable_schedule_timeout_killable(timeout);
4197         timeout <<= 1;
4198         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4199                 return NFS4_LOCK_MAXTIMEOUT;
4200         return timeout;
4201 }
4202
4203 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4204 {
4205         struct inode *inode = state->inode;
4206         struct nfs_server *server = NFS_SERVER(inode);
4207         struct nfs_client *clp = server->nfs_client;
4208         struct nfs_lockt_args arg = {
4209                 .fh = NFS_FH(inode),
4210                 .fl = request,
4211         };
4212         struct nfs_lockt_res res = {
4213                 .denied = request,
4214         };
4215         struct rpc_message msg = {
4216                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4217                 .rpc_argp       = &arg,
4218                 .rpc_resp       = &res,
4219                 .rpc_cred       = state->owner->so_cred,
4220         };
4221         struct nfs4_lock_state *lsp;
4222         int status;
4223
4224         arg.lock_owner.clientid = clp->cl_clientid;
4225         status = nfs4_set_lock_state(state, request);
4226         if (status != 0)
4227                 goto out;
4228         lsp = request->fl_u.nfs4_fl.owner;
4229         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4230         arg.lock_owner.s_dev = server->s_dev;
4231         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4232         switch (status) {
4233                 case 0:
4234                         request->fl_type = F_UNLCK;
4235                         break;
4236                 case -NFS4ERR_DENIED:
4237                         status = 0;
4238         }
4239         request->fl_ops->fl_release_private(request);
4240 out:
4241         return status;
4242 }
4243
4244 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4245 {
4246         struct nfs4_exception exception = { };
4247         int err;
4248
4249         do {
4250                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4251                                 _nfs4_proc_getlk(state, cmd, request),
4252                                 &exception);
4253         } while (exception.retry);
4254         return err;
4255 }
4256
4257 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4258 {
4259         int res = 0;
4260         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4261                 case FL_POSIX:
4262                         res = posix_lock_file_wait(file, fl);
4263                         break;
4264                 case FL_FLOCK:
4265                         res = flock_lock_file_wait(file, fl);
4266                         break;
4267                 default:
4268                         BUG();
4269         }
4270         return res;
4271 }
4272
4273 struct nfs4_unlockdata {
4274         struct nfs_locku_args arg;
4275         struct nfs_locku_res res;
4276         struct nfs4_lock_state *lsp;
4277         struct nfs_open_context *ctx;
4278         struct file_lock fl;
4279         const struct nfs_server *server;
4280         unsigned long timestamp;
4281 };
4282
4283 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4284                 struct nfs_open_context *ctx,
4285                 struct nfs4_lock_state *lsp,
4286                 struct nfs_seqid *seqid)
4287 {
4288         struct nfs4_unlockdata *p;
4289         struct inode *inode = lsp->ls_state->inode;
4290
4291         p = kzalloc(sizeof(*p), GFP_NOFS);
4292         if (p == NULL)
4293                 return NULL;
4294         p->arg.fh = NFS_FH(inode);
4295         p->arg.fl = &p->fl;
4296         p->arg.seqid = seqid;
4297         p->res.seqid = seqid;
4298         p->arg.stateid = &lsp->ls_stateid;
4299         p->lsp = lsp;
4300         atomic_inc(&lsp->ls_count);
4301         /* Ensure we don't close file until we're done freeing locks! */
4302         p->ctx = get_nfs_open_context(ctx);
4303         memcpy(&p->fl, fl, sizeof(p->fl));
4304         p->server = NFS_SERVER(inode);
4305         return p;
4306 }
4307
4308 static void nfs4_locku_release_calldata(void *data)
4309 {
4310         struct nfs4_unlockdata *calldata = data;
4311         nfs_free_seqid(calldata->arg.seqid);
4312         nfs4_put_lock_state(calldata->lsp);
4313         put_nfs_open_context(calldata->ctx);
4314         kfree(calldata);
4315 }
4316
4317 static void nfs4_locku_done(struct rpc_task *task, void *data)
4318 {
4319         struct nfs4_unlockdata *calldata = data;
4320
4321         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4322                 return;
4323         switch (task->tk_status) {
4324                 case 0:
4325                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4326                                         &calldata->res.stateid);
4327                         renew_lease(calldata->server, calldata->timestamp);
4328                         break;
4329                 case -NFS4ERR_BAD_STATEID:
4330                 case -NFS4ERR_OLD_STATEID:
4331                 case -NFS4ERR_STALE_STATEID:
4332                 case -NFS4ERR_EXPIRED:
4333                         break;
4334                 default:
4335                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4336                                 rpc_restart_call_prepare(task);
4337         }
4338 }
4339
4340 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4341 {
4342         struct nfs4_unlockdata *calldata = data;
4343
4344         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4345                 return;
4346         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4347                 /* Note: exit _without_ running nfs4_locku_done */
4348                 task->tk_action = NULL;
4349                 return;
4350         }
4351         calldata->timestamp = jiffies;
4352         if (nfs4_setup_sequence(calldata->server,
4353                                 &calldata->arg.seq_args,
4354                                 &calldata->res.seq_res, task))
4355                 return;
4356         rpc_call_start(task);
4357 }
4358
4359 static const struct rpc_call_ops nfs4_locku_ops = {
4360         .rpc_call_prepare = nfs4_locku_prepare,
4361         .rpc_call_done = nfs4_locku_done,
4362         .rpc_release = nfs4_locku_release_calldata,
4363 };
4364
4365 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4366                 struct nfs_open_context *ctx,
4367                 struct nfs4_lock_state *lsp,
4368                 struct nfs_seqid *seqid)
4369 {
4370         struct nfs4_unlockdata *data;
4371         struct rpc_message msg = {
4372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4373                 .rpc_cred = ctx->cred,
4374         };
4375         struct rpc_task_setup task_setup_data = {
4376                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4377                 .rpc_message = &msg,
4378                 .callback_ops = &nfs4_locku_ops,
4379                 .workqueue = nfsiod_workqueue,
4380                 .flags = RPC_TASK_ASYNC,
4381         };
4382
4383         /* Ensure this is an unlock - when canceling a lock, the
4384          * canceled lock is passed in, and it won't be an unlock.
4385          */
4386         fl->fl_type = F_UNLCK;
4387
4388         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4389         if (data == NULL) {
4390                 nfs_free_seqid(seqid);
4391                 return ERR_PTR(-ENOMEM);
4392         }
4393
4394         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4395         msg.rpc_argp = &data->arg;
4396         msg.rpc_resp = &data->res;
4397         task_setup_data.callback_data = data;
4398         return rpc_run_task(&task_setup_data);
4399 }
4400
4401 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4402 {
4403         struct nfs_inode *nfsi = NFS_I(state->inode);
4404         struct nfs_seqid *seqid;
4405         struct nfs4_lock_state *lsp;
4406         struct rpc_task *task;
4407         int status = 0;
4408         unsigned char fl_flags = request->fl_flags;
4409
4410         status = nfs4_set_lock_state(state, request);
4411         /* Unlock _before_ we do the RPC call */
4412         request->fl_flags |= FL_EXISTS;
4413         down_read(&nfsi->rwsem);
4414         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4415                 up_read(&nfsi->rwsem);
4416                 goto out;
4417         }
4418         up_read(&nfsi->rwsem);
4419         if (status != 0)
4420                 goto out;
4421         /* Is this a delegated lock? */
4422         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4423                 goto out;
4424         lsp = request->fl_u.nfs4_fl.owner;
4425         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4426         status = -ENOMEM;
4427         if (seqid == NULL)
4428                 goto out;
4429         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4430         status = PTR_ERR(task);
4431         if (IS_ERR(task))
4432                 goto out;
4433         status = nfs4_wait_for_completion_rpc_task(task);
4434         rpc_put_task(task);
4435 out:
4436         request->fl_flags = fl_flags;
4437         return status;
4438 }
4439
4440 struct nfs4_lockdata {
4441         struct nfs_lock_args arg;
4442         struct nfs_lock_res res;
4443         struct nfs4_lock_state *lsp;
4444         struct nfs_open_context *ctx;
4445         struct file_lock fl;
4446         unsigned long timestamp;
4447         int rpc_status;
4448         int cancelled;
4449         struct nfs_server *server;
4450 };
4451
4452 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4453                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4454                 gfp_t gfp_mask)
4455 {
4456         struct nfs4_lockdata *p;
4457         struct inode *inode = lsp->ls_state->inode;
4458         struct nfs_server *server = NFS_SERVER(inode);
4459
4460         p = kzalloc(sizeof(*p), gfp_mask);
4461         if (p == NULL)
4462                 return NULL;
4463
4464         p->arg.fh = NFS_FH(inode);
4465         p->arg.fl = &p->fl;
4466         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4467         if (p->arg.open_seqid == NULL)
4468                 goto out_free;
4469         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4470         if (p->arg.lock_seqid == NULL)
4471                 goto out_free_seqid;
4472         p->arg.lock_stateid = &lsp->ls_stateid;
4473         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4474         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4475         p->arg.lock_owner.s_dev = server->s_dev;
4476         p->res.lock_seqid = p->arg.lock_seqid;
4477         p->lsp = lsp;
4478         p->server = server;
4479         atomic_inc(&lsp->ls_count);
4480         p->ctx = get_nfs_open_context(ctx);
4481         memcpy(&p->fl, fl, sizeof(p->fl));
4482         return p;
4483 out_free_seqid:
4484         nfs_free_seqid(p->arg.open_seqid);
4485 out_free:
4486         kfree(p);
4487         return NULL;
4488 }
4489
4490 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4491 {
4492         struct nfs4_lockdata *data = calldata;
4493         struct nfs4_state *state = data->lsp->ls_state;
4494
4495         dprintk("%s: begin!\n", __func__);
4496         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4497                 return;
4498         /* Do we need to do an open_to_lock_owner? */
4499         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4500                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4501                         return;
4502                 data->arg.open_stateid = &state->stateid;
4503                 data->arg.new_lock_owner = 1;
4504                 data->res.open_seqid = data->arg.open_seqid;
4505         } else
4506                 data->arg.new_lock_owner = 0;
4507         data->timestamp = jiffies;
4508         if (nfs4_setup_sequence(data->server,
4509                                 &data->arg.seq_args,
4510                                 &data->res.seq_res, task))
4511                 return;
4512         rpc_call_start(task);
4513         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4514 }
4515
4516 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4517 {
4518         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4519         nfs4_lock_prepare(task, calldata);
4520 }
4521
4522 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4523 {
4524         struct nfs4_lockdata *data = calldata;
4525
4526         dprintk("%s: begin!\n", __func__);
4527
4528         if (!nfs4_sequence_done(task, &data->res.seq_res))
4529                 return;
4530
4531         data->rpc_status = task->tk_status;
4532         if (data->arg.new_lock_owner != 0) {
4533                 if (data->rpc_status == 0)
4534                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4535                 else
4536                         goto out;
4537         }
4538         if (data->rpc_status == 0) {
4539                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4540                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4541                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4542         }
4543 out:
4544         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4545 }
4546
4547 static void nfs4_lock_release(void *calldata)
4548 {
4549         struct nfs4_lockdata *data = calldata;
4550
4551         dprintk("%s: begin!\n", __func__);
4552         nfs_free_seqid(data->arg.open_seqid);
4553         if (data->cancelled != 0) {
4554                 struct rpc_task *task;
4555                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4556                                 data->arg.lock_seqid);
4557                 if (!IS_ERR(task))
4558                         rpc_put_task_async(task);
4559                 dprintk("%s: cancelling lock!\n", __func__);
4560         } else
4561                 nfs_free_seqid(data->arg.lock_seqid);
4562         nfs4_put_lock_state(data->lsp);
4563         put_nfs_open_context(data->ctx);
4564         kfree(data);
4565         dprintk("%s: done!\n", __func__);
4566 }
4567
4568 static const struct rpc_call_ops nfs4_lock_ops = {
4569         .rpc_call_prepare = nfs4_lock_prepare,
4570         .rpc_call_done = nfs4_lock_done,
4571         .rpc_release = nfs4_lock_release,
4572 };
4573
4574 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4575         .rpc_call_prepare = nfs4_recover_lock_prepare,
4576         .rpc_call_done = nfs4_lock_done,
4577         .rpc_release = nfs4_lock_release,
4578 };
4579
4580 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4581 {
4582         switch (error) {
4583         case -NFS4ERR_ADMIN_REVOKED:
4584         case -NFS4ERR_BAD_STATEID:
4585                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4586                 if (new_lock_owner != 0 ||
4587                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4588                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4589                 break;
4590         case -NFS4ERR_STALE_STATEID:
4591                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4592         case -NFS4ERR_EXPIRED:
4593                 nfs4_schedule_lease_recovery(server->nfs_client);
4594         };
4595 }
4596
4597 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4598 {
4599         struct nfs4_lockdata *data;
4600         struct rpc_task *task;
4601         struct rpc_message msg = {
4602                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4603                 .rpc_cred = state->owner->so_cred,
4604         };
4605         struct rpc_task_setup task_setup_data = {
4606                 .rpc_client = NFS_CLIENT(state->inode),
4607                 .rpc_message = &msg,
4608                 .callback_ops = &nfs4_lock_ops,
4609                 .workqueue = nfsiod_workqueue,
4610                 .flags = RPC_TASK_ASYNC,
4611         };
4612         int ret;
4613
4614         dprintk("%s: begin!\n", __func__);
4615         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4616                         fl->fl_u.nfs4_fl.owner,
4617                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4618         if (data == NULL)
4619                 return -ENOMEM;
4620         if (IS_SETLKW(cmd))
4621                 data->arg.block = 1;
4622         if (recovery_type > NFS_LOCK_NEW) {
4623                 if (recovery_type == NFS_LOCK_RECLAIM)
4624                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4625                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4626         }
4627         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4628         msg.rpc_argp = &data->arg;
4629         msg.rpc_resp = &data->res;
4630         task_setup_data.callback_data = data;
4631         task = rpc_run_task(&task_setup_data);
4632         if (IS_ERR(task))
4633                 return PTR_ERR(task);
4634         ret = nfs4_wait_for_completion_rpc_task(task);
4635         if (ret == 0) {
4636                 ret = data->rpc_status;
4637                 if (ret)
4638                         nfs4_handle_setlk_error(data->server, data->lsp,
4639                                         data->arg.new_lock_owner, ret);
4640         } else
4641                 data->cancelled = 1;
4642         rpc_put_task(task);
4643         dprintk("%s: done, ret = %d!\n", __func__, ret);
4644         return ret;
4645 }
4646
4647 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4648 {
4649         struct nfs_server *server = NFS_SERVER(state->inode);
4650         struct nfs4_exception exception = {
4651                 .inode = state->inode,
4652         };
4653         int err;
4654
4655         do {
4656                 /* Cache the lock if possible... */
4657                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4658                         return 0;
4659                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4660                 if (err != -NFS4ERR_DELAY)
4661                         break;
4662                 nfs4_handle_exception(server, err, &exception);
4663         } while (exception.retry);
4664         return err;
4665 }
4666
4667 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4668 {
4669         struct nfs_server *server = NFS_SERVER(state->inode);
4670         struct nfs4_exception exception = {
4671                 .inode = state->inode,
4672         };
4673         int err;
4674
4675         err = nfs4_set_lock_state(state, request);
4676         if (err != 0)
4677                 return err;
4678         do {
4679                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4680                         return 0;
4681                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4682                 switch (err) {
4683                 default:
4684                         goto out;
4685                 case -NFS4ERR_GRACE:
4686                 case -NFS4ERR_DELAY:
4687                         nfs4_handle_exception(server, err, &exception);
4688                         err = 0;
4689                 }
4690         } while (exception.retry);
4691 out:
4692         return err;
4693 }
4694
4695 #if defined(CONFIG_NFS_V4_1)
4696 static int nfs41_check_expired_locks(struct nfs4_state *state)
4697 {
4698         int status, ret = NFS_OK;
4699         struct nfs4_lock_state *lsp;
4700         struct nfs_server *server = NFS_SERVER(state->inode);
4701
4702         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4703                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4704                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4705                         if (status != NFS_OK) {
4706                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4707                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4708                                 ret = status;
4709                         }
4710                 }
4711         };
4712
4713         return ret;
4714 }
4715
4716 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4717 {
4718         int status = NFS_OK;
4719
4720         if (test_bit(LK_STATE_IN_USE, &state->flags))
4721                 status = nfs41_check_expired_locks(state);
4722         if (status == NFS_OK)
4723                 return status;
4724         return nfs4_lock_expired(state, request);
4725 }
4726 #endif
4727
4728 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4729 {
4730         struct nfs_inode *nfsi = NFS_I(state->inode);
4731         unsigned char fl_flags = request->fl_flags;
4732         int status = -ENOLCK;
4733
4734         if ((fl_flags & FL_POSIX) &&
4735                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4736                 goto out;
4737         /* Is this a delegated open? */
4738         status = nfs4_set_lock_state(state, request);
4739         if (status != 0)
4740                 goto out;
4741         request->fl_flags |= FL_ACCESS;
4742         status = do_vfs_lock(request->fl_file, request);
4743         if (status < 0)
4744                 goto out;
4745         down_read(&nfsi->rwsem);
4746         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4747                 /* Yes: cache locks! */
4748                 /* ...but avoid races with delegation recall... */
4749                 request->fl_flags = fl_flags & ~FL_SLEEP;
4750                 status = do_vfs_lock(request->fl_file, request);
4751                 goto out_unlock;
4752         }
4753         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4754         if (status != 0)
4755                 goto out_unlock;
4756         /* Note: we always want to sleep here! */
4757         request->fl_flags = fl_flags | FL_SLEEP;
4758         if (do_vfs_lock(request->fl_file, request) < 0)
4759                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4760                         "manager!\n", __func__);
4761 out_unlock:
4762         up_read(&nfsi->rwsem);
4763 out:
4764         request->fl_flags = fl_flags;
4765         return status;
4766 }
4767
4768 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4769 {
4770         struct nfs4_exception exception = {
4771                 .state = state,
4772                 .inode = state->inode,
4773         };
4774         int err;
4775
4776         do {
4777                 err = _nfs4_proc_setlk(state, cmd, request);
4778                 if (err == -NFS4ERR_DENIED)
4779                         err = -EAGAIN;
4780                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4781                                 err, &exception);
4782         } while (exception.retry);
4783         return err;
4784 }
4785
4786 static int
4787 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4788 {
4789         struct nfs_open_context *ctx;
4790         struct nfs4_state *state;
4791         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4792         int status;
4793
4794         /* verify open state */
4795         ctx = nfs_file_open_context(filp);
4796         state = ctx->state;
4797
4798         if (request->fl_start < 0 || request->fl_end < 0)
4799                 return -EINVAL;
4800
4801         if (IS_GETLK(cmd)) {
4802                 if (state != NULL)
4803                         return nfs4_proc_getlk(state, F_GETLK, request);
4804                 return 0;
4805         }
4806
4807         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4808                 return -EINVAL;
4809
4810         if (request->fl_type == F_UNLCK) {
4811                 if (state != NULL)
4812                         return nfs4_proc_unlck(state, cmd, request);
4813                 return 0;
4814         }
4815
4816         if (state == NULL)
4817                 return -ENOLCK;
4818         /*
4819          * Don't rely on the VFS having checked the file open mode,
4820          * since it won't do this for flock() locks.
4821          */
4822         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4823         case F_RDLCK:
4824                 if (!(filp->f_mode & FMODE_READ))
4825                         return -EBADF;
4826                 break;
4827         case F_WRLCK:
4828                 if (!(filp->f_mode & FMODE_WRITE))
4829                         return -EBADF;
4830         }
4831
4832         do {
4833                 status = nfs4_proc_setlk(state, cmd, request);
4834                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4835                         break;
4836                 timeout = nfs4_set_lock_task_retry(timeout);
4837                 status = -ERESTARTSYS;
4838                 if (signalled())
4839                         break;
4840         } while(status < 0);
4841         return status;
4842 }
4843
4844 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4845 {
4846         struct nfs_server *server = NFS_SERVER(state->inode);
4847         struct nfs4_exception exception = { };
4848         int err;
4849
4850         err = nfs4_set_lock_state(state, fl);
4851         if (err != 0)
4852                 goto out;
4853         do {
4854                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4855                 switch (err) {
4856                         default:
4857                                 printk(KERN_ERR "NFS: %s: unhandled error "
4858                                         "%d.\n", __func__, err);
4859                         case 0:
4860                         case -ESTALE:
4861                                 goto out;
4862                         case -NFS4ERR_EXPIRED:
4863                                 nfs4_schedule_stateid_recovery(server, state);
4864                         case -NFS4ERR_STALE_CLIENTID:
4865                         case -NFS4ERR_STALE_STATEID:
4866                                 nfs4_schedule_lease_recovery(server->nfs_client);
4867                                 goto out;
4868                         case -NFS4ERR_BADSESSION:
4869                         case -NFS4ERR_BADSLOT:
4870                         case -NFS4ERR_BAD_HIGH_SLOT:
4871                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4872                         case -NFS4ERR_DEADSESSION:
4873                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4874                                 goto out;
4875                         case -ERESTARTSYS:
4876                                 /*
4877                                  * The show must go on: exit, but mark the
4878                                  * stateid as needing recovery.
4879                                  */
4880                         case -NFS4ERR_DELEG_REVOKED:
4881                         case -NFS4ERR_ADMIN_REVOKED:
4882                         case -NFS4ERR_BAD_STATEID:
4883                         case -NFS4ERR_OPENMODE:
4884                                 nfs4_schedule_stateid_recovery(server, state);
4885                                 err = 0;
4886                                 goto out;
4887                         case -EKEYEXPIRED:
4888                                 /*
4889                                  * User RPCSEC_GSS context has expired.
4890                                  * We cannot recover this stateid now, so
4891                                  * skip it and allow recovery thread to
4892                                  * proceed.
4893                                  */
4894                                 err = 0;
4895                                 goto out;
4896                         case -ENOMEM:
4897                         case -NFS4ERR_DENIED:
4898                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4899                                 err = 0;
4900                                 goto out;
4901                         case -NFS4ERR_DELAY:
4902                                 break;
4903                 }
4904                 err = nfs4_handle_exception(server, err, &exception);
4905         } while (exception.retry);
4906 out:
4907         return err;
4908 }
4909
4910 struct nfs_release_lockowner_data {
4911         struct nfs4_lock_state *lsp;
4912         struct nfs_server *server;
4913         struct nfs_release_lockowner_args args;
4914 };
4915
4916 static void nfs4_release_lockowner_release(void *calldata)
4917 {
4918         struct nfs_release_lockowner_data *data = calldata;
4919         nfs4_free_lock_state(data->server, data->lsp);
4920         kfree(calldata);
4921 }
4922
4923 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4924         .rpc_release = nfs4_release_lockowner_release,
4925 };
4926
4927 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4928 {
4929         struct nfs_server *server = lsp->ls_state->owner->so_server;
4930         struct nfs_release_lockowner_data *data;
4931         struct rpc_message msg = {
4932                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4933         };
4934
4935         if (server->nfs_client->cl_mvops->minor_version != 0)
4936                 return -EINVAL;
4937         data = kmalloc(sizeof(*data), GFP_NOFS);
4938         if (!data)
4939                 return -ENOMEM;
4940         data->lsp = lsp;
4941         data->server = server;
4942         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4943         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4944         data->args.lock_owner.s_dev = server->s_dev;
4945         msg.rpc_argp = &data->args;
4946         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4947         return 0;
4948 }
4949
4950 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4951
4952 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4953                                    const void *buf, size_t buflen,
4954                                    int flags, int type)
4955 {
4956         if (strcmp(key, "") != 0)
4957                 return -EINVAL;
4958
4959         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4960 }
4961
4962 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4963                                    void *buf, size_t buflen, int type)
4964 {
4965         if (strcmp(key, "") != 0)
4966                 return -EINVAL;
4967
4968         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4969 }
4970
4971 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4972                                        size_t list_len, const char *name,
4973                                        size_t name_len, int type)
4974 {
4975         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4976
4977         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4978                 return 0;
4979
4980         if (list && len <= list_len)
4981                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4982         return len;
4983 }
4984
4985 /*
4986  * nfs_fhget will use either the mounted_on_fileid or the fileid
4987  */
4988 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4989 {
4990         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4991                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4992               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4993               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4994                 return;
4995
4996         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4997                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4998         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4999         fattr->nlink = 2;
5000 }
5001
5002 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5003                                    const struct qstr *name,
5004                                    struct nfs4_fs_locations *fs_locations,
5005                                    struct page *page)
5006 {
5007         struct nfs_server *server = NFS_SERVER(dir);
5008         u32 bitmask[2] = {
5009                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5010         };
5011         struct nfs4_fs_locations_arg args = {
5012                 .dir_fh = NFS_FH(dir),
5013                 .name = name,
5014                 .page = page,
5015                 .bitmask = bitmask,
5016         };
5017         struct nfs4_fs_locations_res res = {
5018                 .fs_locations = fs_locations,
5019         };
5020         struct rpc_message msg = {
5021                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5022                 .rpc_argp = &args,
5023                 .rpc_resp = &res,
5024         };
5025         int status;
5026
5027         dprintk("%s: start\n", __func__);
5028
5029         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5030          * is not supported */
5031         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5032                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5033         else
5034                 bitmask[0] |= FATTR4_WORD0_FILEID;
5035
5036         nfs_fattr_init(&fs_locations->fattr);
5037         fs_locations->server = server;
5038         fs_locations->nlocations = 0;
5039         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5040         dprintk("%s: returned status = %d\n", __func__, status);
5041         return status;
5042 }
5043
5044 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5045                            const struct qstr *name,
5046                            struct nfs4_fs_locations *fs_locations,
5047                            struct page *page)
5048 {
5049         struct nfs4_exception exception = { };
5050         int err;
5051         do {
5052                 err = nfs4_handle_exception(NFS_SERVER(dir),
5053                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5054                                 &exception);
5055         } while (exception.retry);
5056         return err;
5057 }
5058
5059 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5060 {
5061         int status;
5062         struct nfs4_secinfo_arg args = {
5063                 .dir_fh = NFS_FH(dir),
5064                 .name   = name,
5065         };
5066         struct nfs4_secinfo_res res = {
5067                 .flavors     = flavors,
5068         };
5069         struct rpc_message msg = {
5070                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5071                 .rpc_argp = &args,
5072                 .rpc_resp = &res,
5073         };
5074
5075         dprintk("NFS call  secinfo %s\n", name->name);
5076         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5077         dprintk("NFS reply  secinfo: %d\n", status);
5078         return status;
5079 }
5080
5081 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5082                       struct nfs4_secinfo_flavors *flavors)
5083 {
5084         struct nfs4_exception exception = { };
5085         int err;
5086         do {
5087                 err = nfs4_handle_exception(NFS_SERVER(dir),
5088                                 _nfs4_proc_secinfo(dir, name, flavors),
5089                                 &exception);
5090         } while (exception.retry);
5091         return err;
5092 }
5093
5094 #ifdef CONFIG_NFS_V4_1
5095 /*
5096  * Check the exchange flags returned by the server for invalid flags, having
5097  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5098  * DS flags set.
5099  */
5100 static int nfs4_check_cl_exchange_flags(u32 flags)
5101 {
5102         if (flags & ~EXCHGID4_FLAG_MASK_R)
5103                 goto out_inval;
5104         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5105             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5106                 goto out_inval;
5107         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5108                 goto out_inval;
5109         return NFS_OK;
5110 out_inval:
5111         return -NFS4ERR_INVAL;
5112 }
5113
5114 static bool
5115 nfs41_same_server_scope(struct nfs41_server_scope *a,
5116                         struct nfs41_server_scope *b)
5117 {
5118         if (a->server_scope_sz == b->server_scope_sz &&
5119             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5120                 return true;
5121
5122         return false;
5123 }
5124
5125 /*
5126  * nfs4_proc_bind_conn_to_session()
5127  *
5128  * The 4.1 client currently uses the same TCP connection for the
5129  * fore and backchannel.
5130  */
5131 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5132 {
5133         int status;
5134         struct nfs41_bind_conn_to_session_res res;
5135         struct rpc_message msg = {
5136                 .rpc_proc =
5137                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5138                 .rpc_argp = clp,
5139                 .rpc_resp = &res,
5140                 .rpc_cred = cred,
5141         };
5142
5143         dprintk("--> %s\n", __func__);
5144         BUG_ON(clp == NULL);
5145
5146         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5147         if (unlikely(res.session == NULL)) {
5148                 status = -ENOMEM;
5149                 goto out;
5150         }
5151
5152         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5153         if (status == 0) {
5154                 if (memcmp(res.session->sess_id.data,
5155                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5156                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5157                         status = -EIO;
5158                         goto out_session;
5159                 }
5160                 if (res.dir != NFS4_CDFS4_BOTH) {
5161                         dprintk("NFS: %s: Unexpected direction from server\n",
5162                                 __func__);
5163                         status = -EIO;
5164                         goto out_session;
5165                 }
5166                 if (res.use_conn_in_rdma_mode) {
5167                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5168                                 __func__);
5169                         status = -EIO;
5170                         goto out_session;
5171                 }
5172         }
5173 out_session:
5174         kfree(res.session);
5175 out:
5176         dprintk("<-- %s status= %d\n", __func__, status);
5177         return status;
5178 }
5179
5180 /*
5181  * nfs4_proc_exchange_id()
5182  *
5183  * Since the clientid has expired, all compounds using sessions
5184  * associated with the stale clientid will be returning
5185  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5186  * be in some phase of session reset.
5187  */
5188 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5189 {
5190         nfs4_verifier verifier;
5191         struct nfs41_exchange_id_args args = {
5192                 .verifier = &verifier,
5193                 .client = clp,
5194                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5195         };
5196         struct nfs41_exchange_id_res res = {
5197                 0
5198         };
5199         int status;
5200         struct rpc_message msg = {
5201                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5202                 .rpc_argp = &args,
5203                 .rpc_resp = &res,
5204                 .rpc_cred = cred,
5205         };
5206
5207         dprintk("--> %s\n", __func__);
5208         BUG_ON(clp == NULL);
5209
5210         nfs4_init_boot_verifier(clp, &verifier);
5211
5212         args.id_len = scnprintf(args.id, sizeof(args.id),
5213                                 "%s/%s/%u",
5214                                 clp->cl_ipaddr,
5215                                 clp->cl_rpcclient->cl_nodename,
5216                                 clp->cl_rpcclient->cl_auth->au_flavor);
5217
5218         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5219                                         GFP_NOFS);
5220         if (unlikely(res.server_owner == NULL)) {
5221                 status = -ENOMEM;
5222                 goto out;
5223         }
5224
5225         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5226                                         GFP_NOFS);
5227         if (unlikely(res.server_scope == NULL)) {
5228                 status = -ENOMEM;
5229                 goto out_server_owner;
5230         }
5231
5232         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5233         if (unlikely(res.impl_id == NULL)) {
5234                 status = -ENOMEM;
5235                 goto out_server_scope;
5236         }
5237
5238         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5239         if (status == 0)
5240                 status = nfs4_check_cl_exchange_flags(res.flags);
5241
5242         if (status == 0) {
5243                 clp->cl_clientid = res.clientid;
5244                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5245                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5246                         clp->cl_seqid = res.seqid;
5247
5248                 kfree(clp->cl_serverowner);
5249                 clp->cl_serverowner = res.server_owner;
5250                 res.server_owner = NULL;
5251
5252                 /* use the most recent implementation id */
5253                 kfree(clp->cl_implid);
5254                 clp->cl_implid = res.impl_id;
5255
5256                 if (clp->cl_serverscope != NULL &&
5257                     !nfs41_same_server_scope(clp->cl_serverscope,
5258                                              res.server_scope)) {
5259                         dprintk("%s: server_scope mismatch detected\n",
5260                                 __func__);
5261                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5262                         kfree(clp->cl_serverscope);
5263                         clp->cl_serverscope = NULL;
5264                 }
5265
5266                 if (clp->cl_serverscope == NULL) {
5267                         clp->cl_serverscope = res.server_scope;
5268                         goto out;
5269                 }
5270         } else
5271                 kfree(res.impl_id);
5272
5273 out_server_owner:
5274         kfree(res.server_owner);
5275 out_server_scope:
5276         kfree(res.server_scope);
5277 out:
5278         if (clp->cl_implid != NULL)
5279                 dprintk("%s: Server Implementation ID: "
5280                         "domain: %s, name: %s, date: %llu,%u\n",
5281                         __func__, clp->cl_implid->domain, clp->cl_implid->name,
5282                         clp->cl_implid->date.seconds,
5283                         clp->cl_implid->date.nseconds);
5284         dprintk("<-- %s status= %d\n", __func__, status);
5285         return status;
5286 }
5287
5288 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5289                 struct rpc_cred *cred)
5290 {
5291         struct rpc_message msg = {
5292                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5293                 .rpc_argp = clp,
5294                 .rpc_cred = cred,
5295         };
5296         int status;
5297
5298         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5299         if (status)
5300                 dprintk("NFS: Got error %d from the server %s on "
5301                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5302         return status;
5303 }
5304
5305 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5306                 struct rpc_cred *cred)
5307 {
5308         unsigned int loop;
5309         int ret;
5310
5311         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5312                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5313                 switch (ret) {
5314                 case -NFS4ERR_DELAY:
5315                 case -NFS4ERR_CLIENTID_BUSY:
5316                         ssleep(1);
5317                         break;
5318                 default:
5319                         return ret;
5320                 }
5321         }
5322         return 0;
5323 }
5324
5325 int nfs4_destroy_clientid(struct nfs_client *clp)
5326 {
5327         struct rpc_cred *cred;
5328         int ret = 0;
5329
5330         if (clp->cl_mvops->minor_version < 1)
5331                 goto out;
5332         if (clp->cl_exchange_flags == 0)
5333                 goto out;
5334         cred = nfs4_get_exchange_id_cred(clp);
5335         ret = nfs4_proc_destroy_clientid(clp, cred);
5336         if (cred)
5337                 put_rpccred(cred);
5338         switch (ret) {
5339         case 0:
5340         case -NFS4ERR_STALE_CLIENTID:
5341                 clp->cl_exchange_flags = 0;
5342         }
5343 out:
5344         return ret;
5345 }
5346
5347 struct nfs4_get_lease_time_data {
5348         struct nfs4_get_lease_time_args *args;
5349         struct nfs4_get_lease_time_res *res;
5350         struct nfs_client *clp;
5351 };
5352
5353 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5354                                         void *calldata)
5355 {
5356         int ret;
5357         struct nfs4_get_lease_time_data *data =
5358                         (struct nfs4_get_lease_time_data *)calldata;
5359
5360         dprintk("--> %s\n", __func__);
5361         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5362         /* just setup sequence, do not trigger session recovery
5363            since we're invoked within one */
5364         ret = nfs41_setup_sequence(data->clp->cl_session,
5365                                    &data->args->la_seq_args,
5366                                    &data->res->lr_seq_res, task);
5367
5368         BUG_ON(ret == -EAGAIN);
5369         rpc_call_start(task);
5370         dprintk("<-- %s\n", __func__);
5371 }
5372
5373 /*
5374  * Called from nfs4_state_manager thread for session setup, so don't recover
5375  * from sequence operation or clientid errors.
5376  */
5377 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5378 {
5379         struct nfs4_get_lease_time_data *data =
5380                         (struct nfs4_get_lease_time_data *)calldata;
5381
5382         dprintk("--> %s\n", __func__);
5383         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5384                 return;
5385         switch (task->tk_status) {
5386         case -NFS4ERR_DELAY:
5387         case -NFS4ERR_GRACE:
5388                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5389                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5390                 task->tk_status = 0;
5391                 /* fall through */
5392         case -NFS4ERR_RETRY_UNCACHED_REP:
5393                 rpc_restart_call_prepare(task);
5394                 return;
5395         }
5396         dprintk("<-- %s\n", __func__);
5397 }
5398
5399 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5400         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5401         .rpc_call_done = nfs4_get_lease_time_done,
5402 };
5403
5404 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5405 {
5406         struct rpc_task *task;
5407         struct nfs4_get_lease_time_args args;
5408         struct nfs4_get_lease_time_res res = {
5409                 .lr_fsinfo = fsinfo,
5410         };
5411         struct nfs4_get_lease_time_data data = {
5412                 .args = &args,
5413                 .res = &res,
5414                 .clp = clp,
5415         };
5416         struct rpc_message msg = {
5417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5418                 .rpc_argp = &args,
5419                 .rpc_resp = &res,
5420         };
5421         struct rpc_task_setup task_setup = {
5422                 .rpc_client = clp->cl_rpcclient,
5423                 .rpc_message = &msg,
5424                 .callback_ops = &nfs4_get_lease_time_ops,
5425                 .callback_data = &data,
5426                 .flags = RPC_TASK_TIMEOUT,
5427         };
5428         int status;
5429
5430         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5431         dprintk("--> %s\n", __func__);
5432         task = rpc_run_task(&task_setup);
5433
5434         if (IS_ERR(task))
5435                 status = PTR_ERR(task);
5436         else {
5437                 status = task->tk_status;
5438                 rpc_put_task(task);
5439         }
5440         dprintk("<-- %s return %d\n", __func__, status);
5441
5442         return status;
5443 }
5444
5445 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5446 {
5447         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5448 }
5449
5450 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5451                 struct nfs4_slot *new,
5452                 u32 max_slots,
5453                 u32 ivalue)
5454 {
5455         struct nfs4_slot *old = NULL;
5456         u32 i;
5457
5458         spin_lock(&tbl->slot_tbl_lock);
5459         if (new) {
5460                 old = tbl->slots;
5461                 tbl->slots = new;
5462                 tbl->max_slots = max_slots;
5463         }
5464         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5465         for (i = 0; i < tbl->max_slots; i++)
5466                 tbl->slots[i].seq_nr = ivalue;
5467         spin_unlock(&tbl->slot_tbl_lock);
5468         kfree(old);
5469 }
5470
5471 /*
5472  * (re)Initialise a slot table
5473  */
5474 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5475                                  u32 ivalue)
5476 {
5477         struct nfs4_slot *new = NULL;
5478         int ret = -ENOMEM;
5479
5480         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5481                 max_reqs, tbl->max_slots);
5482
5483         /* Does the newly negotiated max_reqs match the existing slot table? */
5484         if (max_reqs != tbl->max_slots) {
5485                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5486                 if (!new)
5487                         goto out;
5488         }
5489         ret = 0;
5490
5491         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5492         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5493                 tbl, tbl->slots, tbl->max_slots);
5494 out:
5495         dprintk("<-- %s: return %d\n", __func__, ret);
5496         return ret;
5497 }
5498
5499 /* Destroy the slot table */
5500 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5501 {
5502         if (session->fc_slot_table.slots != NULL) {
5503                 kfree(session->fc_slot_table.slots);
5504                 session->fc_slot_table.slots = NULL;
5505         }
5506         if (session->bc_slot_table.slots != NULL) {
5507                 kfree(session->bc_slot_table.slots);
5508                 session->bc_slot_table.slots = NULL;
5509         }
5510         return;
5511 }
5512
5513 /*
5514  * Initialize or reset the forechannel and backchannel tables
5515  */
5516 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5517 {
5518         struct nfs4_slot_table *tbl;
5519         int status;
5520
5521         dprintk("--> %s\n", __func__);
5522         /* Fore channel */
5523         tbl = &ses->fc_slot_table;
5524         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5525         if (status) /* -ENOMEM */
5526                 return status;
5527         /* Back channel */
5528         tbl = &ses->bc_slot_table;
5529         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5530         if (status && tbl->slots == NULL)
5531                 /* Fore and back channel share a connection so get
5532                  * both slot tables or neither */
5533                 nfs4_destroy_slot_tables(ses);
5534         return status;
5535 }
5536
5537 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5538 {
5539         struct nfs4_session *session;
5540         struct nfs4_slot_table *tbl;
5541
5542         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5543         if (!session)
5544                 return NULL;
5545
5546         tbl = &session->fc_slot_table;
5547         tbl->highest_used_slotid = NFS4_NO_SLOT;
5548         spin_lock_init(&tbl->slot_tbl_lock);
5549         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5550         init_completion(&tbl->complete);
5551
5552         tbl = &session->bc_slot_table;
5553         tbl->highest_used_slotid = NFS4_NO_SLOT;
5554         spin_lock_init(&tbl->slot_tbl_lock);
5555         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5556         init_completion(&tbl->complete);
5557
5558         session->session_state = 1<<NFS4_SESSION_INITING;
5559
5560         session->clp = clp;
5561         return session;
5562 }
5563
5564 void nfs4_destroy_session(struct nfs4_session *session)
5565 {
5566         struct rpc_xprt *xprt;
5567         struct rpc_cred *cred;
5568
5569         cred = nfs4_get_exchange_id_cred(session->clp);
5570         nfs4_proc_destroy_session(session, cred);
5571         if (cred)
5572                 put_rpccred(cred);
5573
5574         rcu_read_lock();
5575         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5576         rcu_read_unlock();
5577         dprintk("%s Destroy backchannel for xprt %p\n",
5578                 __func__, xprt);
5579         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5580         nfs4_destroy_slot_tables(session);
5581         kfree(session);
5582 }
5583
5584 /*
5585  * Initialize the values to be used by the client in CREATE_SESSION
5586  * If nfs4_init_session set the fore channel request and response sizes,
5587  * use them.
5588  *
5589  * Set the back channel max_resp_sz_cached to zero to force the client to
5590  * always set csa_cachethis to FALSE because the current implementation
5591  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5592  */
5593 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5594 {
5595         struct nfs4_session *session = args->client->cl_session;
5596         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5597                      mxresp_sz = session->fc_attrs.max_resp_sz;
5598
5599         if (mxrqst_sz == 0)
5600                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5601         if (mxresp_sz == 0)
5602                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5603         /* Fore channel attributes */
5604         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5605         args->fc_attrs.max_resp_sz = mxresp_sz;
5606         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5607         args->fc_attrs.max_reqs = max_session_slots;
5608
5609         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5610                 "max_ops=%u max_reqs=%u\n",
5611                 __func__,
5612                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5613                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5614
5615         /* Back channel attributes */
5616         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5617         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5618         args->bc_attrs.max_resp_sz_cached = 0;
5619         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5620         args->bc_attrs.max_reqs = 1;
5621
5622         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5623                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5624                 __func__,
5625                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5626                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5627                 args->bc_attrs.max_reqs);
5628 }
5629
5630 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5631 {
5632         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5633         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5634
5635         if (rcvd->max_resp_sz > sent->max_resp_sz)
5636                 return -EINVAL;
5637         /*
5638          * Our requested max_ops is the minimum we need; we're not
5639          * prepared to break up compounds into smaller pieces than that.
5640          * So, no point even trying to continue if the server won't
5641          * cooperate:
5642          */
5643         if (rcvd->max_ops < sent->max_ops)
5644                 return -EINVAL;
5645         if (rcvd->max_reqs == 0)
5646                 return -EINVAL;
5647         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5648                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5649         return 0;
5650 }
5651
5652 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5653 {
5654         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5655         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5656
5657         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5658                 return -EINVAL;
5659         if (rcvd->max_resp_sz < sent->max_resp_sz)
5660                 return -EINVAL;
5661         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5662                 return -EINVAL;
5663         /* These would render the backchannel useless: */
5664         if (rcvd->max_ops != sent->max_ops)
5665                 return -EINVAL;
5666         if (rcvd->max_reqs != sent->max_reqs)
5667                 return -EINVAL;
5668         return 0;
5669 }
5670
5671 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5672                                      struct nfs4_session *session)
5673 {
5674         int ret;
5675
5676         ret = nfs4_verify_fore_channel_attrs(args, session);
5677         if (ret)
5678                 return ret;
5679         return nfs4_verify_back_channel_attrs(args, session);
5680 }
5681
5682 static int _nfs4_proc_create_session(struct nfs_client *clp,
5683                 struct rpc_cred *cred)
5684 {
5685         struct nfs4_session *session = clp->cl_session;
5686         struct nfs41_create_session_args args = {
5687                 .client = clp,
5688                 .cb_program = NFS4_CALLBACK,
5689         };
5690         struct nfs41_create_session_res res = {
5691                 .client = clp,
5692         };
5693         struct rpc_message msg = {
5694                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5695                 .rpc_argp = &args,
5696                 .rpc_resp = &res,
5697                 .rpc_cred = cred,
5698         };
5699         int status;
5700
5701         nfs4_init_channel_attrs(&args);
5702         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5703
5704         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5705
5706         if (!status)
5707                 /* Verify the session's negotiated channel_attrs values */
5708                 status = nfs4_verify_channel_attrs(&args, session);
5709         if (!status) {
5710                 /* Increment the clientid slot sequence id */
5711                 clp->cl_seqid++;
5712         }
5713
5714         return status;
5715 }
5716
5717 /*
5718  * Issues a CREATE_SESSION operation to the server.
5719  * It is the responsibility of the caller to verify the session is
5720  * expired before calling this routine.
5721  */
5722 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5723 {
5724         int status;
5725         unsigned *ptr;
5726         struct nfs4_session *session = clp->cl_session;
5727
5728         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5729
5730         status = _nfs4_proc_create_session(clp, cred);
5731         if (status)
5732                 goto out;
5733
5734         /* Init or reset the session slot tables */
5735         status = nfs4_setup_session_slot_tables(session);
5736         dprintk("slot table setup returned %d\n", status);
5737         if (status)
5738                 goto out;
5739
5740         ptr = (unsigned *)&session->sess_id.data[0];
5741         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5742                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5743 out:
5744         dprintk("<-- %s\n", __func__);
5745         return status;
5746 }
5747
5748 /*
5749  * Issue the over-the-wire RPC DESTROY_SESSION.
5750  * The caller must serialize access to this routine.
5751  */
5752 int nfs4_proc_destroy_session(struct nfs4_session *session,
5753                 struct rpc_cred *cred)
5754 {
5755         struct rpc_message msg = {
5756                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5757                 .rpc_argp = session,
5758                 .rpc_cred = cred,
5759         };
5760         int status = 0;
5761
5762         dprintk("--> nfs4_proc_destroy_session\n");
5763
5764         /* session is still being setup */
5765         if (session->clp->cl_cons_state != NFS_CS_READY)
5766                 return status;
5767
5768         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5769
5770         if (status)
5771                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5772                         "Session has been destroyed regardless...\n", status);
5773
5774         dprintk("<-- nfs4_proc_destroy_session\n");
5775         return status;
5776 }
5777
5778 /*
5779  * With sessions, the client is not marked ready until after a
5780  * successful EXCHANGE_ID and CREATE_SESSION.
5781  *
5782  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5783  * other versions of NFS can be tried.
5784  */
5785 static int nfs41_check_session_ready(struct nfs_client *clp)
5786 {
5787         int ret;
5788
5789         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
5790                 ret = nfs4_client_recover_expired_lease(clp);
5791                 if (ret)
5792                         return ret;
5793         }
5794         if (clp->cl_cons_state < NFS_CS_READY)
5795                 return -EPROTONOSUPPORT;
5796         smp_rmb();
5797         return 0;
5798 }
5799
5800 int nfs4_init_session(struct nfs_server *server)
5801 {
5802         struct nfs_client *clp = server->nfs_client;
5803         struct nfs4_session *session;
5804         unsigned int rsize, wsize;
5805
5806         if (!nfs4_has_session(clp))
5807                 return 0;
5808
5809         session = clp->cl_session;
5810         spin_lock(&clp->cl_lock);
5811         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5812
5813                 rsize = server->rsize;
5814                 if (rsize == 0)
5815                         rsize = NFS_MAX_FILE_IO_SIZE;
5816                 wsize = server->wsize;
5817                 if (wsize == 0)
5818                         wsize = NFS_MAX_FILE_IO_SIZE;
5819
5820                 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5821                 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5822         }
5823         spin_unlock(&clp->cl_lock);
5824
5825         return nfs41_check_session_ready(clp);
5826 }
5827
5828 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
5829 {
5830         struct nfs4_session *session = clp->cl_session;
5831         int ret;
5832
5833         spin_lock(&clp->cl_lock);
5834         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5835                 /*
5836                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
5837                  * DS lease to be equal to the MDS lease.
5838                  */
5839                 clp->cl_lease_time = lease_time;
5840                 clp->cl_last_renewal = jiffies;
5841         }
5842         spin_unlock(&clp->cl_lock);
5843
5844         ret = nfs41_check_session_ready(clp);
5845         if (ret)
5846                 return ret;
5847         /* Test for the DS role */
5848         if (!is_ds_client(clp))
5849                 return -ENODEV;
5850         return 0;
5851 }
5852 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5853
5854
5855 /*
5856  * Renew the cl_session lease.
5857  */
5858 struct nfs4_sequence_data {
5859         struct nfs_client *clp;
5860         struct nfs4_sequence_args args;
5861         struct nfs4_sequence_res res;
5862 };
5863
5864 static void nfs41_sequence_release(void *data)
5865 {
5866         struct nfs4_sequence_data *calldata = data;
5867         struct nfs_client *clp = calldata->clp;
5868
5869         if (atomic_read(&clp->cl_count) > 1)
5870                 nfs4_schedule_state_renewal(clp);
5871         nfs_put_client(clp);
5872         kfree(calldata);
5873 }
5874
5875 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5876 {
5877         switch(task->tk_status) {
5878         case -NFS4ERR_DELAY:
5879                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5880                 return -EAGAIN;
5881         default:
5882                 nfs4_schedule_lease_recovery(clp);
5883         }
5884         return 0;
5885 }
5886
5887 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5888 {
5889         struct nfs4_sequence_data *calldata = data;
5890         struct nfs_client *clp = calldata->clp;
5891
5892         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5893                 return;
5894
5895         if (task->tk_status < 0) {
5896                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5897                 if (atomic_read(&clp->cl_count) == 1)
5898                         goto out;
5899
5900                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5901                         rpc_restart_call_prepare(task);
5902                         return;
5903                 }
5904         }
5905         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5906 out:
5907         dprintk("<-- %s\n", __func__);
5908 }
5909
5910 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5911 {
5912         struct nfs4_sequence_data *calldata = data;
5913         struct nfs_client *clp = calldata->clp;
5914         struct nfs4_sequence_args *args;
5915         struct nfs4_sequence_res *res;
5916
5917         args = task->tk_msg.rpc_argp;
5918         res = task->tk_msg.rpc_resp;
5919
5920         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5921                 return;
5922         rpc_call_start(task);
5923 }
5924
5925 static const struct rpc_call_ops nfs41_sequence_ops = {
5926         .rpc_call_done = nfs41_sequence_call_done,
5927         .rpc_call_prepare = nfs41_sequence_prepare,
5928         .rpc_release = nfs41_sequence_release,
5929 };
5930
5931 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5932 {
5933         struct nfs4_sequence_data *calldata;
5934         struct rpc_message msg = {
5935                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5936                 .rpc_cred = cred,
5937         };
5938         struct rpc_task_setup task_setup_data = {
5939                 .rpc_client = clp->cl_rpcclient,
5940                 .rpc_message = &msg,
5941                 .callback_ops = &nfs41_sequence_ops,
5942                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5943         };
5944
5945         if (!atomic_inc_not_zero(&clp->cl_count))
5946                 return ERR_PTR(-EIO);
5947         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5948         if (calldata == NULL) {
5949                 nfs_put_client(clp);
5950                 return ERR_PTR(-ENOMEM);
5951         }
5952         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5953         msg.rpc_argp = &calldata->args;
5954         msg.rpc_resp = &calldata->res;
5955         calldata->clp = clp;
5956         task_setup_data.callback_data = calldata;
5957
5958         return rpc_run_task(&task_setup_data);
5959 }
5960
5961 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5962 {
5963         struct rpc_task *task;
5964         int ret = 0;
5965
5966         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5967                 return 0;
5968         task = _nfs41_proc_sequence(clp, cred);
5969         if (IS_ERR(task))
5970                 ret = PTR_ERR(task);
5971         else
5972                 rpc_put_task_async(task);
5973         dprintk("<-- %s status=%d\n", __func__, ret);
5974         return ret;
5975 }
5976
5977 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5978 {
5979         struct rpc_task *task;
5980         int ret;
5981
5982         task = _nfs41_proc_sequence(clp, cred);
5983         if (IS_ERR(task)) {
5984                 ret = PTR_ERR(task);
5985                 goto out;
5986         }
5987         ret = rpc_wait_for_completion_task(task);
5988         if (!ret) {
5989                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5990
5991                 if (task->tk_status == 0)
5992                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5993                 ret = task->tk_status;
5994         }
5995         rpc_put_task(task);
5996 out:
5997         dprintk("<-- %s status=%d\n", __func__, ret);
5998         return ret;
5999 }
6000
6001 struct nfs4_reclaim_complete_data {
6002         struct nfs_client *clp;
6003         struct nfs41_reclaim_complete_args arg;
6004         struct nfs41_reclaim_complete_res res;
6005 };
6006
6007 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6008 {
6009         struct nfs4_reclaim_complete_data *calldata = data;
6010
6011         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6012         if (nfs41_setup_sequence(calldata->clp->cl_session,
6013                                 &calldata->arg.seq_args,
6014                                 &calldata->res.seq_res, task))
6015                 return;
6016
6017         rpc_call_start(task);
6018 }
6019
6020 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6021 {
6022         switch(task->tk_status) {
6023         case 0:
6024         case -NFS4ERR_COMPLETE_ALREADY:
6025         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6026                 break;
6027         case -NFS4ERR_DELAY:
6028                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6029                 /* fall through */
6030         case -NFS4ERR_RETRY_UNCACHED_REP:
6031                 return -EAGAIN;
6032         default:
6033                 nfs4_schedule_lease_recovery(clp);
6034         }
6035         return 0;
6036 }
6037
6038 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6039 {
6040         struct nfs4_reclaim_complete_data *calldata = data;
6041         struct nfs_client *clp = calldata->clp;
6042         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6043
6044         dprintk("--> %s\n", __func__);
6045         if (!nfs41_sequence_done(task, res))
6046                 return;
6047
6048         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6049                 rpc_restart_call_prepare(task);
6050                 return;
6051         }
6052         dprintk("<-- %s\n", __func__);
6053 }
6054
6055 static void nfs4_free_reclaim_complete_data(void *data)
6056 {
6057         struct nfs4_reclaim_complete_data *calldata = data;
6058
6059         kfree(calldata);
6060 }
6061
6062 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6063         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6064         .rpc_call_done = nfs4_reclaim_complete_done,
6065         .rpc_release = nfs4_free_reclaim_complete_data,
6066 };
6067
6068 /*
6069  * Issue a global reclaim complete.
6070  */
6071 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6072 {
6073         struct nfs4_reclaim_complete_data *calldata;
6074         struct rpc_task *task;
6075         struct rpc_message msg = {
6076                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6077         };
6078         struct rpc_task_setup task_setup_data = {
6079                 .rpc_client = clp->cl_rpcclient,
6080                 .rpc_message = &msg,
6081                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6082                 .flags = RPC_TASK_ASYNC,
6083         };
6084         int status = -ENOMEM;
6085
6086         dprintk("--> %s\n", __func__);
6087         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6088         if (calldata == NULL)
6089                 goto out;
6090         calldata->clp = clp;
6091         calldata->arg.one_fs = 0;
6092
6093         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6094         msg.rpc_argp = &calldata->arg;
6095         msg.rpc_resp = &calldata->res;
6096         task_setup_data.callback_data = calldata;
6097         task = rpc_run_task(&task_setup_data);
6098         if (IS_ERR(task)) {
6099                 status = PTR_ERR(task);
6100                 goto out;
6101         }
6102         status = nfs4_wait_for_completion_rpc_task(task);
6103         if (status == 0)
6104                 status = task->tk_status;
6105         rpc_put_task(task);
6106         return 0;
6107 out:
6108         dprintk("<-- %s status=%d\n", __func__, status);
6109         return status;
6110 }
6111
6112 static void
6113 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6114 {
6115         struct nfs4_layoutget *lgp = calldata;
6116         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6117
6118         dprintk("--> %s\n", __func__);
6119         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6120          * right now covering the LAYOUTGET we are about to send.
6121          * However, that is not so catastrophic, and there seems
6122          * to be no way to prevent it completely.
6123          */
6124         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6125                                 &lgp->res.seq_res, task))
6126                 return;
6127         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6128                                           NFS_I(lgp->args.inode)->layout,
6129                                           lgp->args.ctx->state)) {
6130                 rpc_exit(task, NFS4_OK);
6131                 return;
6132         }
6133         rpc_call_start(task);
6134 }
6135
6136 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6137 {
6138         struct nfs4_layoutget *lgp = calldata;
6139         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6140
6141         dprintk("--> %s\n", __func__);
6142
6143         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6144                 return;
6145
6146         switch (task->tk_status) {
6147         case 0:
6148                 break;
6149         case -NFS4ERR_LAYOUTTRYLATER:
6150         case -NFS4ERR_RECALLCONFLICT:
6151                 task->tk_status = -NFS4ERR_DELAY;
6152                 /* Fall through */
6153         default:
6154                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6155                         rpc_restart_call_prepare(task);
6156                         return;
6157                 }
6158         }
6159         dprintk("<-- %s\n", __func__);
6160 }
6161
6162 static void nfs4_layoutget_release(void *calldata)
6163 {
6164         struct nfs4_layoutget *lgp = calldata;
6165
6166         dprintk("--> %s\n", __func__);
6167         put_nfs_open_context(lgp->args.ctx);
6168         kfree(calldata);
6169         dprintk("<-- %s\n", __func__);
6170 }
6171
6172 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6173         .rpc_call_prepare = nfs4_layoutget_prepare,
6174         .rpc_call_done = nfs4_layoutget_done,
6175         .rpc_release = nfs4_layoutget_release,
6176 };
6177
6178 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
6179 {
6180         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6181         struct rpc_task *task;
6182         struct rpc_message msg = {
6183                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6184                 .rpc_argp = &lgp->args,
6185                 .rpc_resp = &lgp->res,
6186         };
6187         struct rpc_task_setup task_setup_data = {
6188                 .rpc_client = server->client,
6189                 .rpc_message = &msg,
6190                 .callback_ops = &nfs4_layoutget_call_ops,
6191                 .callback_data = lgp,
6192                 .flags = RPC_TASK_ASYNC,
6193         };
6194         int status = 0;
6195
6196         dprintk("--> %s\n", __func__);
6197
6198         lgp->res.layoutp = &lgp->args.layout;
6199         lgp->res.seq_res.sr_slot = NULL;
6200         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6201         task = rpc_run_task(&task_setup_data);
6202         if (IS_ERR(task))
6203                 return PTR_ERR(task);
6204         status = nfs4_wait_for_completion_rpc_task(task);
6205         if (status == 0)
6206                 status = task->tk_status;
6207         if (status == 0)
6208                 status = pnfs_layout_process(lgp);
6209         rpc_put_task(task);
6210         dprintk("<-- %s status=%d\n", __func__, status);
6211         return status;
6212 }
6213
6214 static void
6215 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6216 {
6217         struct nfs4_layoutreturn *lrp = calldata;
6218
6219         dprintk("--> %s\n", __func__);
6220         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6221                                 &lrp->res.seq_res, task))
6222                 return;
6223         rpc_call_start(task);
6224 }
6225
6226 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6227 {
6228         struct nfs4_layoutreturn *lrp = calldata;
6229         struct nfs_server *server;
6230         struct pnfs_layout_hdr *lo = lrp->args.layout;
6231
6232         dprintk("--> %s\n", __func__);
6233
6234         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6235                 return;
6236
6237         server = NFS_SERVER(lrp->args.inode);
6238         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6239                 rpc_restart_call_prepare(task);
6240                 return;
6241         }
6242         spin_lock(&lo->plh_inode->i_lock);
6243         if (task->tk_status == 0) {
6244                 if (lrp->res.lrs_present) {
6245                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6246                 } else
6247                         BUG_ON(!list_empty(&lo->plh_segs));
6248         }
6249         lo->plh_block_lgets--;
6250         spin_unlock(&lo->plh_inode->i_lock);
6251         dprintk("<-- %s\n", __func__);
6252 }
6253
6254 static void nfs4_layoutreturn_release(void *calldata)
6255 {
6256         struct nfs4_layoutreturn *lrp = calldata;
6257
6258         dprintk("--> %s\n", __func__);
6259         put_layout_hdr(lrp->args.layout);
6260         kfree(calldata);
6261         dprintk("<-- %s\n", __func__);
6262 }
6263
6264 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6265         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6266         .rpc_call_done = nfs4_layoutreturn_done,
6267         .rpc_release = nfs4_layoutreturn_release,
6268 };
6269
6270 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6271 {
6272         struct rpc_task *task;
6273         struct rpc_message msg = {
6274                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6275                 .rpc_argp = &lrp->args,
6276                 .rpc_resp = &lrp->res,
6277         };
6278         struct rpc_task_setup task_setup_data = {
6279                 .rpc_client = lrp->clp->cl_rpcclient,
6280                 .rpc_message = &msg,
6281                 .callback_ops = &nfs4_layoutreturn_call_ops,
6282                 .callback_data = lrp,
6283         };
6284         int status;
6285
6286         dprintk("--> %s\n", __func__);
6287         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6288         task = rpc_run_task(&task_setup_data);
6289         if (IS_ERR(task))
6290                 return PTR_ERR(task);
6291         status = task->tk_status;
6292         dprintk("<-- %s status=%d\n", __func__, status);
6293         rpc_put_task(task);
6294         return status;
6295 }
6296
6297 /*
6298  * Retrieve the list of Data Server devices from the MDS.
6299  */
6300 static int _nfs4_getdevicelist(struct nfs_server *server,
6301                                     const struct nfs_fh *fh,
6302                                     struct pnfs_devicelist *devlist)
6303 {
6304         struct nfs4_getdevicelist_args args = {
6305                 .fh = fh,
6306                 .layoutclass = server->pnfs_curr_ld->id,
6307         };
6308         struct nfs4_getdevicelist_res res = {
6309                 .devlist = devlist,
6310         };
6311         struct rpc_message msg = {
6312                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6313                 .rpc_argp = &args,
6314                 .rpc_resp = &res,
6315         };
6316         int status;
6317
6318         dprintk("--> %s\n", __func__);
6319         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6320                                 &res.seq_res, 0);
6321         dprintk("<-- %s status=%d\n", __func__, status);
6322         return status;
6323 }
6324
6325 int nfs4_proc_getdevicelist(struct nfs_server *server,
6326                             const struct nfs_fh *fh,
6327                             struct pnfs_devicelist *devlist)
6328 {
6329         struct nfs4_exception exception = { };
6330         int err;
6331
6332         do {
6333                 err = nfs4_handle_exception(server,
6334                                 _nfs4_getdevicelist(server, fh, devlist),
6335                                 &exception);
6336         } while (exception.retry);
6337
6338         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6339                 err, devlist->num_devs);
6340
6341         return err;
6342 }
6343 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6344
6345 static int
6346 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6347 {
6348         struct nfs4_getdeviceinfo_args args = {
6349                 .pdev = pdev,
6350         };
6351         struct nfs4_getdeviceinfo_res res = {
6352                 .pdev = pdev,
6353         };
6354         struct rpc_message msg = {
6355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6356                 .rpc_argp = &args,
6357                 .rpc_resp = &res,
6358         };
6359         int status;
6360
6361         dprintk("--> %s\n", __func__);
6362         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6363         dprintk("<-- %s status=%d\n", __func__, status);
6364
6365         return status;
6366 }
6367
6368 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6369 {
6370         struct nfs4_exception exception = { };
6371         int err;
6372
6373         do {
6374                 err = nfs4_handle_exception(server,
6375                                         _nfs4_proc_getdeviceinfo(server, pdev),
6376                                         &exception);
6377         } while (exception.retry);
6378         return err;
6379 }
6380 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6381
6382 static void nfs4_layoutcommit_prepare(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_setup_sequence(server, &data->args.seq_args,
6388                                 &data->res.seq_res, task))
6389                 return;
6390         rpc_call_start(task);
6391 }
6392
6393 static void
6394 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6395 {
6396         struct nfs4_layoutcommit_data *data = calldata;
6397         struct nfs_server *server = NFS_SERVER(data->args.inode);
6398
6399         if (!nfs4_sequence_done(task, &data->res.seq_res))
6400                 return;
6401
6402         switch (task->tk_status) { /* Just ignore these failures */
6403         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6404         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6405         case -NFS4ERR_BADLAYOUT:     /* no layout */
6406         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6407                 task->tk_status = 0;
6408                 break;
6409         case 0:
6410                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6411                                                    data->res.fattr);
6412                 break;
6413         default:
6414                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6415                         rpc_restart_call_prepare(task);
6416                         return;
6417                 }
6418         }
6419 }
6420
6421 static void nfs4_layoutcommit_release(void *calldata)
6422 {
6423         struct nfs4_layoutcommit_data *data = calldata;
6424         struct pnfs_layout_segment *lseg, *tmp;
6425         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6426
6427         pnfs_cleanup_layoutcommit(data);
6428         /* Matched by references in pnfs_set_layoutcommit */
6429         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6430                 list_del_init(&lseg->pls_lc_list);
6431                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6432                                        &lseg->pls_flags))
6433                         put_lseg(lseg);
6434         }
6435
6436         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6437         smp_mb__after_clear_bit();
6438         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6439
6440         put_rpccred(data->cred);
6441         kfree(data);
6442 }
6443
6444 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6445         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6446         .rpc_call_done = nfs4_layoutcommit_done,
6447         .rpc_release = nfs4_layoutcommit_release,
6448 };
6449
6450 int
6451 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6452 {
6453         struct rpc_message msg = {
6454                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6455                 .rpc_argp = &data->args,
6456                 .rpc_resp = &data->res,
6457                 .rpc_cred = data->cred,
6458         };
6459         struct rpc_task_setup task_setup_data = {
6460                 .task = &data->task,
6461                 .rpc_client = NFS_CLIENT(data->args.inode),
6462                 .rpc_message = &msg,
6463                 .callback_ops = &nfs4_layoutcommit_ops,
6464                 .callback_data = data,
6465                 .flags = RPC_TASK_ASYNC,
6466         };
6467         struct rpc_task *task;
6468         int status = 0;
6469
6470         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6471                 "lbw: %llu inode %lu\n",
6472                 data->task.tk_pid, sync,
6473                 data->args.lastbytewritten,
6474                 data->args.inode->i_ino);
6475
6476         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6477         task = rpc_run_task(&task_setup_data);
6478         if (IS_ERR(task))
6479                 return PTR_ERR(task);
6480         if (sync == false)
6481                 goto out;
6482         status = nfs4_wait_for_completion_rpc_task(task);
6483         if (status != 0)
6484                 goto out;
6485         status = task->tk_status;
6486 out:
6487         dprintk("%s: status %d\n", __func__, status);
6488         rpc_put_task(task);
6489         return status;
6490 }
6491
6492 static int
6493 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6494                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6495 {
6496         struct nfs41_secinfo_no_name_args args = {
6497                 .style = SECINFO_STYLE_CURRENT_FH,
6498         };
6499         struct nfs4_secinfo_res res = {
6500                 .flavors = flavors,
6501         };
6502         struct rpc_message msg = {
6503                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6504                 .rpc_argp = &args,
6505                 .rpc_resp = &res,
6506         };
6507         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6508 }
6509
6510 static int
6511 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6512                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6513 {
6514         struct nfs4_exception exception = { };
6515         int err;
6516         do {
6517                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6518                 switch (err) {
6519                 case 0:
6520                 case -NFS4ERR_WRONGSEC:
6521                 case -NFS4ERR_NOTSUPP:
6522                         goto out;
6523                 default:
6524                         err = nfs4_handle_exception(server, err, &exception);
6525                 }
6526         } while (exception.retry);
6527 out:
6528         return err;
6529 }
6530
6531 static int
6532 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6533                     struct nfs_fsinfo *info)
6534 {
6535         int err;
6536         struct page *page;
6537         rpc_authflavor_t flavor;
6538         struct nfs4_secinfo_flavors *flavors;
6539
6540         page = alloc_page(GFP_KERNEL);
6541         if (!page) {
6542                 err = -ENOMEM;
6543                 goto out;
6544         }
6545
6546         flavors = page_address(page);
6547         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6548
6549         /*
6550          * Fall back on "guess and check" method if
6551          * the server doesn't support SECINFO_NO_NAME
6552          */
6553         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6554                 err = nfs4_find_root_sec(server, fhandle, info);
6555                 goto out_freepage;
6556         }
6557         if (err)
6558                 goto out_freepage;
6559
6560         flavor = nfs_find_best_sec(flavors);
6561         if (err == 0)
6562                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6563
6564 out_freepage:
6565         put_page(page);
6566         if (err == -EACCES)
6567                 return -EPERM;
6568 out:
6569         return err;
6570 }
6571
6572 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6573 {
6574         int status;
6575         struct nfs41_test_stateid_args args = {
6576                 .stateid = stateid,
6577         };
6578         struct nfs41_test_stateid_res res;
6579         struct rpc_message msg = {
6580                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6581                 .rpc_argp = &args,
6582                 .rpc_resp = &res,
6583         };
6584
6585         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6586         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6587
6588         if (status == NFS_OK)
6589                 return res.status;
6590         return status;
6591 }
6592
6593 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6594 {
6595         struct nfs4_exception exception = { };
6596         int err;
6597         do {
6598                 err = nfs4_handle_exception(server,
6599                                 _nfs41_test_stateid(server, stateid),
6600                                 &exception);
6601         } while (exception.retry);
6602         return err;
6603 }
6604
6605 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6606 {
6607         struct nfs41_free_stateid_args args = {
6608                 .stateid = stateid,
6609         };
6610         struct nfs41_free_stateid_res res;
6611         struct rpc_message msg = {
6612                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6613                 .rpc_argp = &args,
6614                 .rpc_resp = &res,
6615         };
6616
6617         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6618         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6619 }
6620
6621 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6622 {
6623         struct nfs4_exception exception = { };
6624         int err;
6625         do {
6626                 err = nfs4_handle_exception(server,
6627                                 _nfs4_free_stateid(server, stateid),
6628                                 &exception);
6629         } while (exception.retry);
6630         return err;
6631 }
6632
6633 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6634                 const nfs4_stateid *s2)
6635 {
6636         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6637                 return false;
6638
6639         if (s1->seqid == s2->seqid)
6640                 return true;
6641         if (s1->seqid == 0 || s2->seqid == 0)
6642                 return true;
6643
6644         return false;
6645 }
6646
6647 #endif /* CONFIG_NFS_V4_1 */
6648
6649 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6650                 const nfs4_stateid *s2)
6651 {
6652         return nfs4_stateid_match(s1, s2);
6653 }
6654
6655
6656 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6657         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6658         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6659         .recover_open   = nfs4_open_reclaim,
6660         .recover_lock   = nfs4_lock_reclaim,
6661         .establish_clid = nfs4_init_clientid,
6662         .get_clid_cred  = nfs4_get_setclientid_cred,
6663 };
6664
6665 #if defined(CONFIG_NFS_V4_1)
6666 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6667         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6668         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6669         .recover_open   = nfs4_open_reclaim,
6670         .recover_lock   = nfs4_lock_reclaim,
6671         .establish_clid = nfs41_init_clientid,
6672         .get_clid_cred  = nfs4_get_exchange_id_cred,
6673         .reclaim_complete = nfs41_proc_reclaim_complete,
6674 };
6675 #endif /* CONFIG_NFS_V4_1 */
6676
6677 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6678         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6679         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6680         .recover_open   = nfs4_open_expired,
6681         .recover_lock   = nfs4_lock_expired,
6682         .establish_clid = nfs4_init_clientid,
6683         .get_clid_cred  = nfs4_get_setclientid_cred,
6684 };
6685
6686 #if defined(CONFIG_NFS_V4_1)
6687 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6688         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6689         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6690         .recover_open   = nfs41_open_expired,
6691         .recover_lock   = nfs41_lock_expired,
6692         .establish_clid = nfs41_init_clientid,
6693         .get_clid_cred  = nfs4_get_exchange_id_cred,
6694 };
6695 #endif /* CONFIG_NFS_V4_1 */
6696
6697 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6698         .sched_state_renewal = nfs4_proc_async_renew,
6699         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6700         .renew_lease = nfs4_proc_renew,
6701 };
6702
6703 #if defined(CONFIG_NFS_V4_1)
6704 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6705         .sched_state_renewal = nfs41_proc_async_sequence,
6706         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6707         .renew_lease = nfs4_proc_sequence,
6708 };
6709 #endif
6710
6711 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6712         .minor_version = 0,
6713         .call_sync = _nfs4_call_sync,
6714         .match_stateid = nfs4_match_stateid,
6715         .find_root_sec = nfs4_find_root_sec,
6716         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6717         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6718         .state_renewal_ops = &nfs40_state_renewal_ops,
6719 };
6720
6721 #if defined(CONFIG_NFS_V4_1)
6722 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6723         .minor_version = 1,
6724         .call_sync = _nfs4_call_sync_session,
6725         .match_stateid = nfs41_match_stateid,
6726         .find_root_sec = nfs41_find_root_sec,
6727         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6728         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6729         .state_renewal_ops = &nfs41_state_renewal_ops,
6730 };
6731 #endif
6732
6733 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6734         [0] = &nfs_v4_0_minor_ops,
6735 #if defined(CONFIG_NFS_V4_1)
6736         [1] = &nfs_v4_1_minor_ops,
6737 #endif
6738 };
6739
6740 static const struct inode_operations nfs4_file_inode_operations = {
6741         .permission     = nfs_permission,
6742         .getattr        = nfs_getattr,
6743         .setattr        = nfs_setattr,
6744         .getxattr       = generic_getxattr,
6745         .setxattr       = generic_setxattr,
6746         .listxattr      = generic_listxattr,
6747         .removexattr    = generic_removexattr,
6748 };
6749
6750 const struct nfs_rpc_ops nfs_v4_clientops = {
6751         .version        = 4,                    /* protocol version */
6752         .dentry_ops     = &nfs4_dentry_operations,
6753         .dir_inode_ops  = &nfs4_dir_inode_operations,
6754         .file_inode_ops = &nfs4_file_inode_operations,
6755         .file_ops       = &nfs4_file_operations,
6756         .getroot        = nfs4_proc_get_root,
6757         .submount       = nfs4_submount,
6758         .getattr        = nfs4_proc_getattr,
6759         .setattr        = nfs4_proc_setattr,
6760         .lookup         = nfs4_proc_lookup,
6761         .access         = nfs4_proc_access,
6762         .readlink       = nfs4_proc_readlink,
6763         .create         = nfs4_proc_create,
6764         .remove         = nfs4_proc_remove,
6765         .unlink_setup   = nfs4_proc_unlink_setup,
6766         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6767         .unlink_done    = nfs4_proc_unlink_done,
6768         .rename         = nfs4_proc_rename,
6769         .rename_setup   = nfs4_proc_rename_setup,
6770         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6771         .rename_done    = nfs4_proc_rename_done,
6772         .link           = nfs4_proc_link,
6773         .symlink        = nfs4_proc_symlink,
6774         .mkdir          = nfs4_proc_mkdir,
6775         .rmdir          = nfs4_proc_remove,
6776         .readdir        = nfs4_proc_readdir,
6777         .mknod          = nfs4_proc_mknod,
6778         .statfs         = nfs4_proc_statfs,
6779         .fsinfo         = nfs4_proc_fsinfo,
6780         .pathconf       = nfs4_proc_pathconf,
6781         .set_capabilities = nfs4_server_capabilities,
6782         .decode_dirent  = nfs4_decode_dirent,
6783         .read_setup     = nfs4_proc_read_setup,
6784         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6785         .read_done      = nfs4_read_done,
6786         .write_setup    = nfs4_proc_write_setup,
6787         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6788         .write_done     = nfs4_write_done,
6789         .commit_setup   = nfs4_proc_commit_setup,
6790         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6791         .commit_done    = nfs4_commit_done,
6792         .lock           = nfs4_proc_lock,
6793         .clear_acl_cache = nfs4_zap_acl_attr,
6794         .close_context  = nfs4_close_context,
6795         .open_context   = nfs4_atomic_open,
6796         .init_client    = nfs4_init_client,
6797 };
6798
6799 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6800         .prefix = XATTR_NAME_NFSV4_ACL,
6801         .list   = nfs4_xattr_list_nfs4_acl,
6802         .get    = nfs4_xattr_get_nfs4_acl,
6803         .set    = nfs4_xattr_set_nfs4_acl,
6804 };
6805
6806 const struct xattr_handler *nfs4_xattr_handlers[] = {
6807         &nfs4_xattr_nfs4_acl_handler,
6808         NULL
6809 };
6810
6811 module_param(max_session_slots, ushort, 0644);
6812 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6813                 "requests the client will negotiate");
6814
6815 /*
6816  * Local variables:
6817  *  c-basic-offset: 8
6818  * End:
6819  */