Pileus Git - ~andy/linux/blob - 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         default:
 109                 dprintk("%s could not handle NFSv4 error %d\n",
 110                                 __func__, -err);
 111                 break;
 112         }
 113         return -EIO;
 114 }
 115
 116 /*
 117  * This is our standard bitmap for GETATTR requests.
 118  */
 119 const u32 nfs4_fattr_bitmap[2] = {
 120         FATTR4_WORD0_TYPE
 121         | FATTR4_WORD0_CHANGE
 122         | FATTR4_WORD0_SIZE
 123         | FATTR4_WORD0_FSID
 124         | FATTR4_WORD0_FILEID,
 125         FATTR4_WORD1_MODE
 126         | FATTR4_WORD1_NUMLINKS
 127         | FATTR4_WORD1_OWNER
 128         | FATTR4_WORD1_OWNER_GROUP
 129         | FATTR4_WORD1_RAWDEV
 130         | FATTR4_WORD1_SPACE_USED
 131         | FATTR4_WORD1_TIME_ACCESS
 132         | FATTR4_WORD1_TIME_METADATA
 133         | FATTR4_WORD1_TIME_MODIFY
 134 };
 135
 136 const u32 nfs4_statfs_bitmap[2] = {
 137         FATTR4_WORD0_FILES_AVAIL
 138         | FATTR4_WORD0_FILES_FREE
 139         | FATTR4_WORD0_FILES_TOTAL,
 140         FATTR4_WORD1_SPACE_AVAIL
 141         | FATTR4_WORD1_SPACE_FREE
 142         | FATTR4_WORD1_SPACE_TOTAL
 143 };
 144
 145 const u32 nfs4_pathconf_bitmap[2] = {
 146         FATTR4_WORD0_MAXLINK
 147         | FATTR4_WORD0_MAXNAME,
 148         0
 149 };
 150
 151 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 152                         | FATTR4_WORD0_MAXREAD
 153                         | FATTR4_WORD0_MAXWRITE
 154                         | FATTR4_WORD0_LEASE_TIME,
 155                         FATTR4_WORD1_TIME_DELTA
 156                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 157                         FATTR4_WORD2_LAYOUT_BLKSIZE
 158 };
 159
 160 const u32 nfs4_fs_locations_bitmap[2] = {
 161         FATTR4_WORD0_TYPE
 162         | FATTR4_WORD0_CHANGE
 163         | FATTR4_WORD0_SIZE
 164         | FATTR4_WORD0_FSID
 165         | FATTR4_WORD0_FILEID
 166         | FATTR4_WORD0_FS_LOCATIONS,
 167         FATTR4_WORD1_MODE
 168         | FATTR4_WORD1_NUMLINKS
 169         | FATTR4_WORD1_OWNER
 170         | FATTR4_WORD1_OWNER_GROUP
 171         | FATTR4_WORD1_RAWDEV
 172         | FATTR4_WORD1_SPACE_USED
 173         | FATTR4_WORD1_TIME_ACCESS
 174         | FATTR4_WORD1_TIME_METADATA
 175         | FATTR4_WORD1_TIME_MODIFY
 176         | FATTR4_WORD1_MOUNTED_ON_FILEID
 177 };
 178
 179 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 180                 struct nfs4_readdir_arg *readdir)
 181 {
 182         __be32 *start, *p;
 183
 184         BUG_ON(readdir->count < 80);
 185         if (cookie > 2) {
 186                 readdir->cookie = cookie;
 187                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 188                 return;
 189         }
 190
 191         readdir->cookie = 0;
 192         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 193         if (cookie == 2)
 194                 return;
 195
 196         /*
 197          * NFSv4 servers do not return entries for '.' and '..'
 198          * Therefore, we fake these entries here.  We let '.'
 199          * have cookie 0 and '..' have cookie 1.  Note that
 200          * when talking to the server, we always send cookie 0
 201          * instead of 1 or 2.
 202          */
 203         start = p = kmap_atomic(*readdir->pages);
 204
 205         if (cookie == 0) {
 206                 *p++ = xdr_one;                                  /* next */
 207                 *p++ = xdr_zero;                   /* cookie, first word */
 208                 *p++ = xdr_one;                   /* cookie, second word */
 209                 *p++ = xdr_one;                             /* entry len */
 210                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 211                 p++;
 212                 *p++ = xdr_one;                         /* bitmap length */
 213                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 214                 *p++ = htonl(8);              /* attribute buffer length */
 215                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 216         }
 217
 218         *p++ = xdr_one;                                  /* next */
 219         *p++ = xdr_zero;                   /* cookie, first word */
 220         *p++ = xdr_two;                   /* cookie, second word */
 221         *p++ = xdr_two;                             /* entry len */
 222         memcpy(p, "..\0\0", 4);                         /* entry */
 223         p++;
 224         *p++ = xdr_one;                         /* bitmap length */
 225         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 226         *p++ = htonl(8);              /* attribute buffer length */
 227         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 228
 229         readdir->pgbase = (char *)p - (char *)start;
 230         readdir->count -= readdir->pgbase;
 231         kunmap_atomic(start);
 232 }
 233
 234 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 235 {
 236         int res;
 237
 238         might_sleep();
 239
 240         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 241                         nfs_wait_bit_killable, TASK_KILLABLE);
 242         return res;
 243 }
 244
 245 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 246 {
 247         int res = 0;
 248
 249         might_sleep();
 250
 251         if (*timeout <= 0)
 252                 *timeout = NFS4_POLL_RETRY_MIN;
 253         if (*timeout > NFS4_POLL_RETRY_MAX)
 254                 *timeout = NFS4_POLL_RETRY_MAX;
 255         freezable_schedule_timeout_killable(*timeout);
 256         if (fatal_signal_pending(current))
 257                 res = -ERESTARTSYS;
 258         *timeout <<= 1;
 259         return res;
 260 }
 261
 262 /* This is the error handling routine for processes that are allowed
 263  * to sleep.
 264  */
 265 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 266 {
 267         struct nfs_client *clp = server->nfs_client;
 268         struct nfs4_state *state = exception->state;
 269         struct inode *inode = exception->inode;
 270         int ret = errorcode;
 271
 272         exception->retry = 0;
 273         switch(errorcode) {
 274                 case 0:
 275                         return 0;
 276                 case -NFS4ERR_OPENMODE:
 277                         if (inode && nfs_have_delegation(inode, FMODE_READ)) {
 278                                 nfs_inode_return_delegation(inode);
 279                                 exception->retry = 1;
 280                                 return 0;
 281                         }
 282                         if (state == NULL)
 283                                 break;
 284                         nfs4_schedule_stateid_recovery(server, state);
 285                         goto wait_on_recovery;
 286                 case -NFS4ERR_DELEG_REVOKED:
 287                 case -NFS4ERR_ADMIN_REVOKED:
 288                 case -NFS4ERR_BAD_STATEID:
 289                         if (state == NULL)
 290                                 break;
 291                         nfs_remove_bad_delegation(state->inode);
 292                         nfs4_schedule_stateid_recovery(server, state);
 293                         goto wait_on_recovery;
 294                 case -NFS4ERR_EXPIRED:
 295                         if (state != NULL)
 296                                 nfs4_schedule_stateid_recovery(server, state);
 297                 case -NFS4ERR_STALE_STATEID:
 298                 case -NFS4ERR_STALE_CLIENTID:
 299                         nfs4_schedule_lease_recovery(clp);
 300                         goto wait_on_recovery;
 301 #if defined(CONFIG_NFS_V4_1)
 302                 case -NFS4ERR_BADSESSION:
 303                 case -NFS4ERR_BADSLOT:
 304                 case -NFS4ERR_BAD_HIGH_SLOT:
 305                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 306                 case -NFS4ERR_DEADSESSION:
 307                 case -NFS4ERR_SEQ_FALSE_RETRY:
 308                 case -NFS4ERR_SEQ_MISORDERED:
 309                         dprintk("%s ERROR: %d Reset session\n", __func__,
 310                                 errorcode);
 311                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 312                         exception->retry = 1;
 313                         break;
 314 #endif /* defined(CONFIG_NFS_V4_1) */
 315                 case -NFS4ERR_FILE_OPEN:
 316                         if (exception->timeout > HZ) {
 317                                 /* We have retried a decent amount, time to
 318                                  * fail
 319                                  */
 320                                 ret = -EBUSY;
 321                                 break;
 322                         }
 323                 case -NFS4ERR_GRACE:
 324                 case -NFS4ERR_DELAY:
 325                 case -EKEYEXPIRED:
 326                         ret = nfs4_delay(server->client, &exception->timeout);
 327                         if (ret != 0)
 328                                 break;
 329                 case -NFS4ERR_RETRY_UNCACHED_REP:
 330                 case -NFS4ERR_OLD_STATEID:
 331                         exception->retry = 1;
 332                         break;
 333                 case -NFS4ERR_BADOWNER:
 334                         /* The following works around a Linux server bug! */
 335                 case -NFS4ERR_BADNAME:
 336                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 337                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 338                                 exception->retry = 1;
 339                                 printk(KERN_WARNING "NFS: v4 server %s "
 340                                                 "does not accept raw "
 341                                                 "uid/gids. "
 342                                                 "Reenabling the idmapper.\n",
 343                                                 server->nfs_client->cl_hostname);
 344                         }
 345         }
 346         /* We failed to handle the error */
 347         return nfs4_map_errors(ret);
 348 wait_on_recovery:
 349         ret = nfs4_wait_clnt_recover(clp);
 350         if (ret == 0)
 351                 exception->retry = 1;
 352         return ret;
 353 }
 354
 355
 356 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 357 {
 358         spin_lock(&clp->cl_lock);
 359         if (time_before(clp->cl_last_renewal,timestamp))
 360                 clp->cl_last_renewal = timestamp;
 361         spin_unlock(&clp->cl_lock);
 362 }
 363
 364 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 365 {
 366         do_renew_lease(server->nfs_client, timestamp);
 367 }
 368
 369 #if defined(CONFIG_NFS_V4_1)
 370
 371 /*
 372  * nfs4_free_slot - free a slot and efficiently update slot table.
 373  *
 374  * freeing a slot is trivially done by clearing its respective bit
 375  * in the bitmap.
 376  * If the freed slotid equals highest_used_slotid we want to update it
 377  * so that the server would be able to size down the slot table if needed,
 378  * otherwise we know that the highest_used_slotid is still in use.
 379  * When updating highest_used_slotid there may be "holes" in the bitmap
 380  * so we need to scan down from highest_used_slotid to 0 looking for the now
 381  * highest slotid in use.
 382  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 383  *
 384  * Must be called while holding tbl->slot_tbl_lock
 385  */
 386 static void
 387 nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
 388 {
 389         BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
 390         /* clear used bit in bitmap */
 391         __clear_bit(slotid, tbl->used_slots);
 392
 393         /* update highest_used_slotid when it is freed */
 394         if (slotid == tbl->highest_used_slotid) {
 395                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 396                 if (slotid < tbl->max_slots)
 397                         tbl->highest_used_slotid = slotid;
 398                 else
 399                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 400         }
 401         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 402                 slotid, tbl->highest_used_slotid);
 403 }
 404
 405 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 406 {
 407         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 408         return true;
 409 }
 410
 411 /*
 412  * Signal state manager thread if session fore channel is drained
 413  */
 414 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 415 {
 416         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 417                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 418                                 nfs4_set_task_privileged, NULL);
 419                 return;
 420         }
 421
 422         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 423                 return;
 424
 425         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 426         complete(&ses->fc_slot_table.complete);
 427 }
 428
 429 /*
 430  * Signal state manager thread if session back channel is drained
 431  */
 432 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 433 {
 434         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 435             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 436                 return;
 437         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 438         complete(&ses->bc_slot_table.complete);
 439 }
 440
 441 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 442 {
 443         struct nfs4_slot_table *tbl;
 444
 445         tbl = &res->sr_session->fc_slot_table;
 446         if (!res->sr_slot) {
 447                 /* just wake up the next guy waiting since
 448                  * we may have not consumed a slot after all */
 449                 dprintk("%s: No slot\n", __func__);
 450                 return;
 451         }
 452
 453         spin_lock(&tbl->slot_tbl_lock);
 454         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 455         nfs4_check_drain_fc_complete(res->sr_session);
 456         spin_unlock(&tbl->slot_tbl_lock);
 457         res->sr_slot = NULL;
 458 }
 459
 460 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 461 {
 462         unsigned long timestamp;
 463         struct nfs_client *clp;
 464
 465         /*
 466          * sr_status remains 1 if an RPC level error occurred. The server
 467          * may or may not have processed the sequence operation..
 468          * Proceed as if the server received and processed the sequence
 469          * operation.
 470          */
 471         if (res->sr_status == 1)
 472                 res->sr_status = NFS_OK;
 473
 474         /* don't increment the sequence number if the task wasn't sent */
 475         if (!RPC_WAS_SENT(task))
 476                 goto out;
 477
 478         /* Check the SEQUENCE operation status */
 479         switch (res->sr_status) {
 480         case 0:
 481                 /* Update the slot's sequence and clientid lease timer */
 482                 ++res->sr_slot->seq_nr;
 483                 timestamp = res->sr_renewal_time;
 484                 clp = res->sr_session->clp;
 485                 do_renew_lease(clp, timestamp);
 486                 /* Check sequence flags */
 487                 if (res->sr_status_flags != 0)
 488                         nfs4_schedule_lease_recovery(clp);
 489                 break;
 490         case -NFS4ERR_DELAY:
 491                 /* The server detected a resend of the RPC call and
 492                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 493                  * of RFC5661.
 494                  */
 495                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 496                         __func__,
 497                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 498                         res->sr_slot->seq_nr);
 499                 goto out_retry;
 500         default:
 501                 /* Just update the slot sequence no. */
 502                 ++res->sr_slot->seq_nr;
 503         }
 504 out:
 505         /* The session may be reset by one of the error handlers. */
 506         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 507         nfs41_sequence_free_slot(res);
 508         return 1;
 509 out_retry:
 510         if (!rpc_restart_call(task))
 511                 goto out;
 512         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 513         return 0;
 514 }
 515
 516 static int nfs4_sequence_done(struct rpc_task *task,
 517                                struct nfs4_sequence_res *res)
 518 {
 519         if (res->sr_session == NULL)
 520                 return 1;
 521         return nfs41_sequence_done(task, res);
 522 }
 523
 524 /*
 525  * nfs4_find_slot - efficiently look for a free slot
 526  *
 527  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 528  * If found, we mark the slot as used, update the highest_used_slotid,
 529  * and respectively set up the sequence operation args.
 530  * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
 531  *
 532  * Note: must be called with under the slot_tbl_lock.
 533  */
 534 static u32
 535 nfs4_find_slot(struct nfs4_slot_table *tbl)
 536 {
 537         u32 slotid;
 538         u32 ret_id = NFS4_NO_SLOT;
 539
 540         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 541                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 542                 tbl->max_slots);
 543         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 544         if (slotid >= tbl->max_slots)
 545                 goto out;
 546         __set_bit(slotid, tbl->used_slots);
 547         if (slotid > tbl->highest_used_slotid ||
 548                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 549                 tbl->highest_used_slotid = slotid;
 550         ret_id = slotid;
 551 out:
 552         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 553                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 554         return ret_id;
 555 }
 556
 557 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 558                 struct nfs4_sequence_res *res, int cache_reply)
 559 {
 560         args->sa_session = NULL;
 561         args->sa_cache_this = 0;
 562         if (cache_reply)
 563                 args->sa_cache_this = 1;
 564         res->sr_session = NULL;
 565         res->sr_slot = NULL;
 566 }
 567
 568 int nfs41_setup_sequence(struct nfs4_session *session,
 569                                 struct nfs4_sequence_args *args,
 570                                 struct nfs4_sequence_res *res,
 571                                 struct rpc_task *task)
 572 {
 573         struct nfs4_slot *slot;
 574         struct nfs4_slot_table *tbl;
 575         u32 slotid;
 576
 577         dprintk("--> %s\n", __func__);
 578         /* slot already allocated? */
 579         if (res->sr_slot != NULL)
 580                 return 0;
 581
 582         tbl = &session->fc_slot_table;
 583
 584         spin_lock(&tbl->slot_tbl_lock);
 585         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 586             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 587                 /* The state manager will wait until the slot table is empty */
 588                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 589                 spin_unlock(&tbl->slot_tbl_lock);
 590                 dprintk("%s session is draining\n", __func__);
 591                 return -EAGAIN;
 592         }
 593
 594         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 595             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 596                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 597                 spin_unlock(&tbl->slot_tbl_lock);
 598                 dprintk("%s enforce FIFO order\n", __func__);
 599                 return -EAGAIN;
 600         }
 601
 602         slotid = nfs4_find_slot(tbl);
 603         if (slotid == NFS4_NO_SLOT) {
 604                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 605                 spin_unlock(&tbl->slot_tbl_lock);
 606                 dprintk("<-- %s: no free slots\n", __func__);
 607                 return -EAGAIN;
 608         }
 609         spin_unlock(&tbl->slot_tbl_lock);
 610
 611         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 612         slot = tbl->slots + slotid;
 613         args->sa_session = session;
 614         args->sa_slotid = slotid;
 615
 616         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 617
 618         res->sr_session = session;
 619         res->sr_slot = slot;
 620         res->sr_renewal_time = jiffies;
 621         res->sr_status_flags = 0;
 622         /*
 623          * sr_status is only set in decode_sequence, and so will remain
 624          * set to 1 if an rpc level failure occurs.
 625          */
 626         res->sr_status = 1;
 627         return 0;
 628 }
 629 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 630
 631 int nfs4_setup_sequence(const struct nfs_server *server,
 632                         struct nfs4_sequence_args *args,
 633                         struct nfs4_sequence_res *res,
 634                         struct rpc_task *task)
 635 {
 636         struct nfs4_session *session = nfs4_get_session(server);
 637         int ret = 0;
 638
 639         if (session == NULL)
 640                 goto out;
 641
 642         dprintk("--> %s clp %p session %p sr_slot %td\n",
 643                 __func__, session->clp, session, res->sr_slot ?
 644                         res->sr_slot - session->fc_slot_table.slots : -1);
 645
 646         ret = nfs41_setup_sequence(session, args, res, task);
 647 out:
 648         dprintk("<-- %s status=%d\n", __func__, ret);
 649         return ret;
 650 }
 651
 652 struct nfs41_call_sync_data {
 653         const struct nfs_server *seq_server;
 654         struct nfs4_sequence_args *seq_args;
 655         struct nfs4_sequence_res *seq_res;
 656 };
 657
 658 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 659 {
 660         struct nfs41_call_sync_data *data = calldata;
 661
 662         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 663
 664         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 665                                 data->seq_res, task))
 666                 return;
 667         rpc_call_start(task);
 668 }
 669
 670 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 671 {
 672         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 673         nfs41_call_sync_prepare(task, calldata);
 674 }
 675
 676 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 677 {
 678         struct nfs41_call_sync_data *data = calldata;
 679
 680         nfs41_sequence_done(task, data->seq_res);
 681 }
 682
 683 static const struct rpc_call_ops nfs41_call_sync_ops = {
 684         .rpc_call_prepare = nfs41_call_sync_prepare,
 685         .rpc_call_done = nfs41_call_sync_done,
 686 };
 687
 688 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 689         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 690         .rpc_call_done = nfs41_call_sync_done,
 691 };
 692
 693 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 694                                    struct nfs_server *server,
 695                                    struct rpc_message *msg,
 696                                    struct nfs4_sequence_args *args,
 697                                    struct nfs4_sequence_res *res,
 698                                    int privileged)
 699 {
 700         int ret;
 701         struct rpc_task *task;
 702         struct nfs41_call_sync_data data = {
 703                 .seq_server = server,
 704                 .seq_args = args,
 705                 .seq_res = res,
 706         };
 707         struct rpc_task_setup task_setup = {
 708                 .rpc_client = clnt,
 709                 .rpc_message = msg,
 710                 .callback_ops = &nfs41_call_sync_ops,
 711                 .callback_data = &data
 712         };
 713
 714         if (privileged)
 715                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 716         task = rpc_run_task(&task_setup);
 717         if (IS_ERR(task))
 718                 ret = PTR_ERR(task);
 719         else {
 720                 ret = task->tk_status;
 721                 rpc_put_task(task);
 722         }
 723         return ret;
 724 }
 725
 726 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 727                             struct nfs_server *server,
 728                             struct rpc_message *msg,
 729                             struct nfs4_sequence_args *args,
 730                             struct nfs4_sequence_res *res,
 731                             int cache_reply)
 732 {
 733         nfs41_init_sequence(args, res, cache_reply);
 734         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 735 }
 736
 737 #else
 738 static inline
 739 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 740                 struct nfs4_sequence_res *res, int cache_reply)
 741 {
 742 }
 743
 744 static int nfs4_sequence_done(struct rpc_task *task,
 745                                struct nfs4_sequence_res *res)
 746 {
 747         return 1;
 748 }
 749 #endif /* CONFIG_NFS_V4_1 */
 750
 751 int _nfs4_call_sync(struct rpc_clnt *clnt,
 752                     struct nfs_server *server,
 753                     struct rpc_message *msg,
 754                     struct nfs4_sequence_args *args,
 755                     struct nfs4_sequence_res *res,
 756                     int cache_reply)
 757 {
 758         nfs41_init_sequence(args, res, cache_reply);
 759         return rpc_call_sync(clnt, msg, 0);
 760 }
 761
 762 static inline
 763 int nfs4_call_sync(struct rpc_clnt *clnt,
 764                    struct nfs_server *server,
 765                    struct rpc_message *msg,
 766                    struct nfs4_sequence_args *args,
 767                    struct nfs4_sequence_res *res,
 768                    int cache_reply)
 769 {
 770         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 771                                                 args, res, cache_reply);
 772 }
 773
 774 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 775 {
 776         struct nfs_inode *nfsi = NFS_I(dir);
 777
 778         spin_lock(&dir->i_lock);
 779         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 780         if (!cinfo->atomic || cinfo->before != dir->i_version)
 781                 nfs_force_lookup_revalidate(dir);
 782         dir->i_version = cinfo->after;
 783         spin_unlock(&dir->i_lock);
 784 }
 785
 786 struct nfs4_opendata {
 787         struct kref kref;
 788         struct nfs_openargs o_arg;
 789         struct nfs_openres o_res;
 790         struct nfs_open_confirmargs c_arg;
 791         struct nfs_open_confirmres c_res;
 792         struct nfs4_string owner_name;
 793         struct nfs4_string group_name;
 794         struct nfs_fattr f_attr;
 795         struct dentry *dir;
 796         struct dentry *dentry;
 797         struct nfs4_state_owner *owner;
 798         struct nfs4_state *state;
 799         struct iattr attrs;
 800         unsigned long timestamp;
 801         unsigned int rpc_done : 1;
 802         int rpc_status;
 803         int cancelled;
 804 };
 805
 806
 807 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 808 {
 809         p->o_res.f_attr = &p->f_attr;
 810         p->o_res.seqid = p->o_arg.seqid;
 811         p->c_res.seqid = p->c_arg.seqid;
 812         p->o_res.server = p->o_arg.server;
 813         nfs_fattr_init(&p->f_attr);
 814         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 815 }
 816
 817 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 818                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 819                 const struct iattr *attrs,
 820                 gfp_t gfp_mask)
 821 {
 822         struct dentry *parent = dget_parent(dentry);
 823         struct inode *dir = parent->d_inode;
 824         struct nfs_server *server = NFS_SERVER(dir);
 825         struct nfs4_opendata *p;
 826
 827         p = kzalloc(sizeof(*p), gfp_mask);
 828         if (p == NULL)
 829                 goto err;
 830         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 831         if (p->o_arg.seqid == NULL)
 832                 goto err_free;
 833         nfs_sb_active(dentry->d_sb);
 834         p->dentry = dget(dentry);
 835         p->dir = parent;
 836         p->owner = sp;
 837         atomic_inc(&sp->so_count);
 838         p->o_arg.fh = NFS_FH(dir);
 839         p->o_arg.open_flags = flags;
 840         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 841         p->o_arg.clientid = server->nfs_client->cl_clientid;
 842         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 843         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 844         p->o_arg.name = &dentry->d_name;
 845         p->o_arg.server = server;
 846         p->o_arg.bitmask = server->attr_bitmask;
 847         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 848         if (attrs != NULL && attrs->ia_valid != 0) {
 849                 __be32 verf[2];
 850
 851                 p->o_arg.u.attrs = &p->attrs;
 852                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 853
 854                 verf[0] = jiffies;
 855                 verf[1] = current->pid;
 856                 memcpy(p->o_arg.u.verifier.data, verf,
 857                                 sizeof(p->o_arg.u.verifier.data));
 858         }
 859         p->c_arg.fh = &p->o_res.fh;
 860         p->c_arg.stateid = &p->o_res.stateid;
 861         p->c_arg.seqid = p->o_arg.seqid;
 862         nfs4_init_opendata_res(p);
 863         kref_init(&p->kref);
 864         return p;
 865 err_free:
 866         kfree(p);
 867 err:
 868         dput(parent);
 869         return NULL;
 870 }
 871
 872 static void nfs4_opendata_free(struct kref *kref)
 873 {
 874         struct nfs4_opendata *p = container_of(kref,
 875                         struct nfs4_opendata, kref);
 876         struct super_block *sb = p->dentry->d_sb;
 877
 878         nfs_free_seqid(p->o_arg.seqid);
 879         if (p->state != NULL)
 880                 nfs4_put_open_state(p->state);
 881         nfs4_put_state_owner(p->owner);
 882         dput(p->dir);
 883         dput(p->dentry);
 884         nfs_sb_deactive(sb);
 885         nfs_fattr_free_names(&p->f_attr);
 886         kfree(p);
 887 }
 888
 889 static void nfs4_opendata_put(struct nfs4_opendata *p)
 890 {
 891         if (p != NULL)
 892                 kref_put(&p->kref, nfs4_opendata_free);
 893 }
 894
 895 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 896 {
 897         int ret;
 898
 899         ret = rpc_wait_for_completion_task(task);
 900         return ret;
 901 }
 902
 903 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 904 {
 905         int ret = 0;
 906
 907         if (open_mode & (O_EXCL|O_TRUNC))
 908                 goto out;
 909         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 910                 case FMODE_READ:
 911                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 912                                 && state->n_rdonly != 0;
 913                         break;
 914                 case FMODE_WRITE:
 915                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 916                                 && state->n_wronly != 0;
 917                         break;
 918                 case FMODE_READ|FMODE_WRITE:
 919                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 920                                 && state->n_rdwr != 0;
 921         }
 922 out:
 923         return ret;
 924 }
 925
 926 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 927 {
 928         if (delegation == NULL)
 929                 return 0;
 930         if ((delegation->type & fmode) != fmode)
 931                 return 0;
 932         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 933                 return 0;
 934         nfs_mark_delegation_referenced(delegation);
 935         return 1;
 936 }
 937
 938 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 939 {
 940         switch (fmode) {
 941                 case FMODE_WRITE:
 942                         state->n_wronly++;
 943                         break;
 944                 case FMODE_READ:
 945                         state->n_rdonly++;
 946                         break;
 947                 case FMODE_READ|FMODE_WRITE:
 948                         state->n_rdwr++;
 949         }
 950         nfs4_state_set_mode_locked(state, state->state | fmode);
 951 }
 952
 953 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 954 {
 955         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 956                 nfs4_stateid_copy(&state->stateid, stateid);
 957         nfs4_stateid_copy(&state->open_stateid, stateid);
 958         switch (fmode) {
 959                 case FMODE_READ:
 960                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 961                         break;
 962                 case FMODE_WRITE:
 963                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 964                         break;
 965                 case FMODE_READ|FMODE_WRITE:
 966                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 967         }
 968 }
 969
 970 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 971 {
 972         write_seqlock(&state->seqlock);
 973         nfs_set_open_stateid_locked(state, stateid, fmode);
 974         write_sequnlock(&state->seqlock);
 975 }
 976
 977 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 978 {
 979         /*
 980          * Protect the call to nfs4_state_set_mode_locked and
 981          * serialise the stateid update
 982          */
 983         write_seqlock(&state->seqlock);
 984         if (deleg_stateid != NULL) {
 985                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 986                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 987         }
 988         if (open_stateid != NULL)
 989                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 990         write_sequnlock(&state->seqlock);
 991         spin_lock(&state->owner->so_lock);
 992         update_open_stateflags(state, fmode);
 993         spin_unlock(&state->owner->so_lock);
 994 }
 995
 996 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 997 {
 998         struct nfs_inode *nfsi = NFS_I(state->inode);
 999         struct nfs_delegation *deleg_cur;
1000         int ret = 0;
1001
1002         fmode &= (FMODE_READ|FMODE_WRITE);
1003
1004         rcu_read_lock();
1005         deleg_cur = rcu_dereference(nfsi->delegation);
1006         if (deleg_cur == NULL)
1007                 goto no_delegation;
1008
1009         spin_lock(&deleg_cur->lock);
1010         if (nfsi->delegation != deleg_cur ||
1011             (deleg_cur->type & fmode) != fmode)
1012                 goto no_delegation_unlock;
1013
1014         if (delegation == NULL)
1015                 delegation = &deleg_cur->stateid;
1016         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1017                 goto no_delegation_unlock;
1018
1019         nfs_mark_delegation_referenced(deleg_cur);
1020         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1021         ret = 1;
1022 no_delegation_unlock:
1023         spin_unlock(&deleg_cur->lock);
1024 no_delegation:
1025         rcu_read_unlock();
1026
1027         if (!ret && open_stateid != NULL) {
1028                 __update_open_stateid(state, open_stateid, NULL, fmode);
1029                 ret = 1;
1030         }
1031
1032         return ret;
1033 }
1034
1035
1036 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1037 {
1038         struct nfs_delegation *delegation;
1039
1040         rcu_read_lock();
1041         delegation = rcu_dereference(NFS_I(inode)->delegation);
1042         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1043                 rcu_read_unlock();
1044                 return;
1045         }
1046         rcu_read_unlock();
1047         nfs_inode_return_delegation(inode);
1048 }
1049
1050 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1051 {
1052         struct nfs4_state *state = opendata->state;
1053         struct nfs_inode *nfsi = NFS_I(state->inode);
1054         struct nfs_delegation *delegation;
1055         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1056         fmode_t fmode = opendata->o_arg.fmode;
1057         nfs4_stateid stateid;
1058         int ret = -EAGAIN;
1059
1060         for (;;) {
1061                 if (can_open_cached(state, fmode, open_mode)) {
1062                         spin_lock(&state->owner->so_lock);
1063                         if (can_open_cached(state, fmode, open_mode)) {
1064                                 update_open_stateflags(state, fmode);
1065                                 spin_unlock(&state->owner->so_lock);
1066                                 goto out_return_state;
1067                         }
1068                         spin_unlock(&state->owner->so_lock);
1069                 }
1070                 rcu_read_lock();
1071                 delegation = rcu_dereference(nfsi->delegation);
1072                 if (!can_open_delegated(delegation, fmode)) {
1073                         rcu_read_unlock();
1074                         break;
1075                 }
1076                 /* Save the delegation */
1077                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1078                 rcu_read_unlock();
1079                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1080                 if (ret != 0)
1081                         goto out;
1082                 ret = -EAGAIN;
1083
1084                 /* Try to update the stateid using the delegation */
1085                 if (update_open_stateid(state, NULL, &stateid, fmode))
1086                         goto out_return_state;
1087         }
1088 out:
1089         return ERR_PTR(ret);
1090 out_return_state:
1091         atomic_inc(&state->count);
1092         return state;
1093 }
1094
1095 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1096 {
1097         struct inode *inode;
1098         struct nfs4_state *state = NULL;
1099         struct nfs_delegation *delegation;
1100         int ret;
1101
1102         if (!data->rpc_done) {
1103                 state = nfs4_try_open_cached(data);
1104                 goto out;
1105         }
1106
1107         ret = -EAGAIN;
1108         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1109                 goto err;
1110         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1111         ret = PTR_ERR(inode);
1112         if (IS_ERR(inode))
1113                 goto err;
1114         ret = -ENOMEM;
1115         state = nfs4_get_open_state(inode, data->owner);
1116         if (state == NULL)
1117                 goto err_put_inode;
1118         if (data->o_res.delegation_type != 0) {
1119                 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1120                 int delegation_flags = 0;
1121
1122                 rcu_read_lock();
1123                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1124                 if (delegation)
1125                         delegation_flags = delegation->flags;
1126                 rcu_read_unlock();
1127                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1128                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1129                                         "returning a delegation for "
1130                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1131                                         clp->cl_hostname);
1132                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1133                         nfs_inode_set_delegation(state->inode,
1134                                         data->owner->so_cred,
1135                                         &data->o_res);
1136                 else
1137                         nfs_inode_reclaim_delegation(state->inode,
1138                                         data->owner->so_cred,
1139                                         &data->o_res);
1140         }
1141
1142         update_open_stateid(state, &data->o_res.stateid, NULL,
1143                         data->o_arg.fmode);
1144         iput(inode);
1145 out:
1146         return state;
1147 err_put_inode:
1148         iput(inode);
1149 err:
1150         return ERR_PTR(ret);
1151 }
1152
1153 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1154 {
1155         struct nfs_inode *nfsi = NFS_I(state->inode);
1156         struct nfs_open_context *ctx;
1157
1158         spin_lock(&state->inode->i_lock);
1159         list_for_each_entry(ctx, &nfsi->open_files, list) {
1160                 if (ctx->state != state)
1161                         continue;
1162                 get_nfs_open_context(ctx);
1163                 spin_unlock(&state->inode->i_lock);
1164                 return ctx;
1165         }
1166         spin_unlock(&state->inode->i_lock);
1167         return ERR_PTR(-ENOENT);
1168 }
1169
1170 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1171 {
1172         struct nfs4_opendata *opendata;
1173
1174         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1175         if (opendata == NULL)
1176                 return ERR_PTR(-ENOMEM);
1177         opendata->state = state;
1178         atomic_inc(&state->count);
1179         return opendata;
1180 }
1181
1182 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1183 {
1184         struct nfs4_state *newstate;
1185         int ret;
1186
1187         opendata->o_arg.open_flags = 0;
1188         opendata->o_arg.fmode = fmode;
1189         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1190         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1191         nfs4_init_opendata_res(opendata);
1192         ret = _nfs4_recover_proc_open(opendata);
1193         if (ret != 0)
1194                 return ret;
1195         newstate = nfs4_opendata_to_nfs4_state(opendata);
1196         if (IS_ERR(newstate))
1197                 return PTR_ERR(newstate);
1198         nfs4_close_state(newstate, fmode);
1199         *res = newstate;
1200         return 0;
1201 }
1202
1203 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1204 {
1205         struct nfs4_state *newstate;
1206         int ret;
1207
1208         /* memory barrier prior to reading state->n_* */
1209         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1210         smp_rmb();
1211         if (state->n_rdwr != 0) {
1212                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1213                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1214                 if (ret != 0)
1215                         return ret;
1216                 if (newstate != state)
1217                         return -ESTALE;
1218         }
1219         if (state->n_wronly != 0) {
1220                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1221                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1222                 if (ret != 0)
1223                         return ret;
1224                 if (newstate != state)
1225                         return -ESTALE;
1226         }
1227         if (state->n_rdonly != 0) {
1228                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1229                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1230                 if (ret != 0)
1231                         return ret;
1232                 if (newstate != state)
1233                         return -ESTALE;
1234         }
1235         /*
1236          * We may have performed cached opens for all three recoveries.
1237          * Check if we need to update the current stateid.
1238          */
1239         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1240             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1241                 write_seqlock(&state->seqlock);
1242                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1243                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1244                 write_sequnlock(&state->seqlock);
1245         }
1246         return 0;
1247 }
1248
1249 /*
1250  * OPEN_RECLAIM:
1251  *      reclaim state on the server after a reboot.
1252  */
1253 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1254 {
1255         struct nfs_delegation *delegation;
1256         struct nfs4_opendata *opendata;
1257         fmode_t delegation_type = 0;
1258         int status;
1259
1260         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1261         if (IS_ERR(opendata))
1262                 return PTR_ERR(opendata);
1263         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1264         opendata->o_arg.fh = NFS_FH(state->inode);
1265         rcu_read_lock();
1266         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1267         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1268                 delegation_type = delegation->type;
1269         rcu_read_unlock();
1270         opendata->o_arg.u.delegation_type = delegation_type;
1271         status = nfs4_open_recover(opendata, state);
1272         nfs4_opendata_put(opendata);
1273         return status;
1274 }
1275
1276 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1277 {
1278         struct nfs_server *server = NFS_SERVER(state->inode);
1279         struct nfs4_exception exception = { };
1280         int err;
1281         do {
1282                 err = _nfs4_do_open_reclaim(ctx, state);
1283                 if (err != -NFS4ERR_DELAY)
1284                         break;
1285                 nfs4_handle_exception(server, err, &exception);
1286         } while (exception.retry);
1287         return err;
1288 }
1289
1290 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1291 {
1292         struct nfs_open_context *ctx;
1293         int ret;
1294
1295         ctx = nfs4_state_find_open_context(state);
1296         if (IS_ERR(ctx))
1297                 return PTR_ERR(ctx);
1298         ret = nfs4_do_open_reclaim(ctx, state);
1299         put_nfs_open_context(ctx);
1300         return ret;
1301 }
1302
1303 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1304 {
1305         struct nfs4_opendata *opendata;
1306         int ret;
1307
1308         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1309         if (IS_ERR(opendata))
1310                 return PTR_ERR(opendata);
1311         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1312         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1313         ret = nfs4_open_recover(opendata, state);
1314         nfs4_opendata_put(opendata);
1315         return ret;
1316 }
1317
1318 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1319 {
1320         struct nfs4_exception exception = { };
1321         struct nfs_server *server = NFS_SERVER(state->inode);
1322         int err;
1323         do {
1324                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1325                 switch (err) {
1326                         case 0:
1327                         case -ENOENT:
1328                         case -ESTALE:
1329                                 goto out;
1330                         case -NFS4ERR_BADSESSION:
1331                         case -NFS4ERR_BADSLOT:
1332                         case -NFS4ERR_BAD_HIGH_SLOT:
1333                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1334                         case -NFS4ERR_DEADSESSION:
1335                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1336                                 goto out;
1337                         case -NFS4ERR_STALE_CLIENTID:
1338                         case -NFS4ERR_STALE_STATEID:
1339                         case -NFS4ERR_EXPIRED:
1340                                 /* Don't recall a delegation if it was lost */
1341                                 nfs4_schedule_lease_recovery(server->nfs_client);
1342                                 goto out;
1343                         case -ERESTARTSYS:
1344                                 /*
1345                                  * The show must go on: exit, but mark the
1346                                  * stateid as needing recovery.
1347                                  */
1348                         case -NFS4ERR_DELEG_REVOKED:
1349                         case -NFS4ERR_ADMIN_REVOKED:
1350                         case -NFS4ERR_BAD_STATEID:
1351                                 nfs_inode_find_state_and_recover(state->inode,
1352                                                 stateid);
1353                                 nfs4_schedule_stateid_recovery(server, state);
1354                         case -EKEYEXPIRED:
1355                                 /*
1356                                  * User RPCSEC_GSS context has expired.
1357                                  * We cannot recover this stateid now, so
1358                                  * skip it and allow recovery thread to
1359                                  * proceed.
1360                                  */
1361                         case -ENOMEM:
1362                                 err = 0;
1363                                 goto out;
1364                 }
1365                 err = nfs4_handle_exception(server, err, &exception);
1366         } while (exception.retry);
1367 out:
1368         return err;
1369 }
1370
1371 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1372 {
1373         struct nfs4_opendata *data = calldata;
1374
1375         data->rpc_status = task->tk_status;
1376         if (data->rpc_status == 0) {
1377                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1378                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1379                 renew_lease(data->o_res.server, data->timestamp);
1380                 data->rpc_done = 1;
1381         }
1382 }
1383
1384 static void nfs4_open_confirm_release(void *calldata)
1385 {
1386         struct nfs4_opendata *data = calldata;
1387         struct nfs4_state *state = NULL;
1388
1389         /* If this request hasn't been cancelled, do nothing */
1390         if (data->cancelled == 0)
1391                 goto out_free;
1392         /* In case of error, no cleanup! */
1393         if (!data->rpc_done)
1394                 goto out_free;
1395         state = nfs4_opendata_to_nfs4_state(data);
1396         if (!IS_ERR(state))
1397                 nfs4_close_state(state, data->o_arg.fmode);
1398 out_free:
1399         nfs4_opendata_put(data);
1400 }
1401
1402 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1403         .rpc_call_done = nfs4_open_confirm_done,
1404         .rpc_release = nfs4_open_confirm_release,
1405 };
1406
1407 /*
1408  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1409  */
1410 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1411 {
1412         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1413         struct rpc_task *task;
1414         struct  rpc_message msg = {
1415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1416                 .rpc_argp = &data->c_arg,
1417                 .rpc_resp = &data->c_res,
1418                 .rpc_cred = data->owner->so_cred,
1419         };
1420         struct rpc_task_setup task_setup_data = {
1421                 .rpc_client = server->client,
1422                 .rpc_message = &msg,
1423                 .callback_ops = &nfs4_open_confirm_ops,
1424                 .callback_data = data,
1425                 .workqueue = nfsiod_workqueue,
1426                 .flags = RPC_TASK_ASYNC,
1427         };
1428         int status;
1429
1430         kref_get(&data->kref);
1431         data->rpc_done = 0;
1432         data->rpc_status = 0;
1433         data->timestamp = jiffies;
1434         task = rpc_run_task(&task_setup_data);
1435         if (IS_ERR(task))
1436                 return PTR_ERR(task);
1437         status = nfs4_wait_for_completion_rpc_task(task);
1438         if (status != 0) {
1439                 data->cancelled = 1;
1440                 smp_wmb();
1441         } else
1442                 status = data->rpc_status;
1443         rpc_put_task(task);
1444         return status;
1445 }
1446
1447 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1448 {
1449         struct nfs4_opendata *data = calldata;
1450         struct nfs4_state_owner *sp = data->owner;
1451
1452         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1453                 return;
1454         /*
1455          * Check if we still need to send an OPEN call, or if we can use
1456          * a delegation instead.
1457          */
1458         if (data->state != NULL) {
1459                 struct nfs_delegation *delegation;
1460
1461                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1462                         goto out_no_action;
1463                 rcu_read_lock();
1464                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1465                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1466                     can_open_delegated(delegation, data->o_arg.fmode))
1467                         goto unlock_no_action;
1468                 rcu_read_unlock();
1469         }
1470         /* Update client id. */
1471         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1472         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1473                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1474                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1475         }
1476         data->timestamp = jiffies;
1477         if (nfs4_setup_sequence(data->o_arg.server,
1478                                 &data->o_arg.seq_args,
1479                                 &data->o_res.seq_res, task))
1480                 return;
1481         rpc_call_start(task);
1482         return;
1483 unlock_no_action:
1484         rcu_read_unlock();
1485 out_no_action:
1486         task->tk_action = NULL;
1487
1488 }
1489
1490 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1491 {
1492         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1493         nfs4_open_prepare(task, calldata);
1494 }
1495
1496 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1497 {
1498         struct nfs4_opendata *data = calldata;
1499
1500         data->rpc_status = task->tk_status;
1501
1502         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1503                 return;
1504
1505         if (task->tk_status == 0) {
1506                 switch (data->o_res.f_attr->mode & S_IFMT) {
1507                         case S_IFREG:
1508                                 break;
1509                         case S_IFLNK:
1510                                 data->rpc_status = -ELOOP;
1511                                 break;
1512                         case S_IFDIR:
1513                                 data->rpc_status = -EISDIR;
1514                                 break;
1515                         default:
1516                                 data->rpc_status = -ENOTDIR;
1517                 }
1518                 renew_lease(data->o_res.server, data->timestamp);
1519                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1520                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1521         }
1522         data->rpc_done = 1;
1523 }
1524
1525 static void nfs4_open_release(void *calldata)
1526 {
1527         struct nfs4_opendata *data = calldata;
1528         struct nfs4_state *state = NULL;
1529
1530         /* If this request hasn't been cancelled, do nothing */
1531         if (data->cancelled == 0)
1532                 goto out_free;
1533         /* In case of error, no cleanup! */
1534         if (data->rpc_status != 0 || !data->rpc_done)
1535                 goto out_free;
1536         /* In case we need an open_confirm, no cleanup! */
1537         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1538                 goto out_free;
1539         state = nfs4_opendata_to_nfs4_state(data);
1540         if (!IS_ERR(state))
1541                 nfs4_close_state(state, data->o_arg.fmode);
1542 out_free:
1543         nfs4_opendata_put(data);
1544 }
1545
1546 static const struct rpc_call_ops nfs4_open_ops = {
1547         .rpc_call_prepare = nfs4_open_prepare,
1548         .rpc_call_done = nfs4_open_done,
1549         .rpc_release = nfs4_open_release,
1550 };
1551
1552 static const struct rpc_call_ops nfs4_recover_open_ops = {
1553         .rpc_call_prepare = nfs4_recover_open_prepare,
1554         .rpc_call_done = nfs4_open_done,
1555         .rpc_release = nfs4_open_release,
1556 };
1557
1558 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1559 {
1560         struct inode *dir = data->dir->d_inode;
1561         struct nfs_server *server = NFS_SERVER(dir);
1562         struct nfs_openargs *o_arg = &data->o_arg;
1563         struct nfs_openres *o_res = &data->o_res;
1564         struct rpc_task *task;
1565         struct rpc_message msg = {
1566                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1567                 .rpc_argp = o_arg,
1568                 .rpc_resp = o_res,
1569                 .rpc_cred = data->owner->so_cred,
1570         };
1571         struct rpc_task_setup task_setup_data = {
1572                 .rpc_client = server->client,
1573                 .rpc_message = &msg,
1574                 .callback_ops = &nfs4_open_ops,
1575                 .callback_data = data,
1576                 .workqueue = nfsiod_workqueue,
1577                 .flags = RPC_TASK_ASYNC,
1578         };
1579         int status;
1580
1581         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1582         kref_get(&data->kref);
1583         data->rpc_done = 0;
1584         data->rpc_status = 0;
1585         data->cancelled = 0;
1586         if (isrecover)
1587                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1588         task = rpc_run_task(&task_setup_data);
1589         if (IS_ERR(task))
1590                 return PTR_ERR(task);
1591         status = nfs4_wait_for_completion_rpc_task(task);
1592         if (status != 0) {
1593                 data->cancelled = 1;
1594                 smp_wmb();
1595         } else
1596                 status = data->rpc_status;
1597         rpc_put_task(task);
1598
1599         return status;
1600 }
1601
1602 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1603 {
1604         struct inode *dir = data->dir->d_inode;
1605         struct nfs_openres *o_res = &data->o_res;
1606         int status;
1607
1608         status = nfs4_run_open_task(data, 1);
1609         if (status != 0 || !data->rpc_done)
1610                 return status;
1611
1612         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1613
1614         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1615                 status = _nfs4_proc_open_confirm(data);
1616                 if (status != 0)
1617                         return status;
1618         }
1619
1620         return status;
1621 }
1622
1623 /*
1624  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1625  */
1626 static int _nfs4_proc_open(struct nfs4_opendata *data)
1627 {
1628         struct inode *dir = data->dir->d_inode;
1629         struct nfs_server *server = NFS_SERVER(dir);
1630         struct nfs_openargs *o_arg = &data->o_arg;
1631         struct nfs_openres *o_res = &data->o_res;
1632         int status;
1633
1634         status = nfs4_run_open_task(data, 0);
1635         if (!data->rpc_done)
1636                 return status;
1637         if (status != 0) {
1638                 if (status == -NFS4ERR_BADNAME &&
1639                                 !(o_arg->open_flags & O_CREAT))
1640                         return -ENOENT;
1641                 return status;
1642         }
1643
1644         nfs_fattr_map_and_free_names(server, &data->f_attr);
1645
1646         if (o_arg->open_flags & O_CREAT)
1647                 update_changeattr(dir, &o_res->cinfo);
1648         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1649                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1650         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1651                 status = _nfs4_proc_open_confirm(data);
1652                 if (status != 0)
1653                         return status;
1654         }
1655         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1656                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1657         return 0;
1658 }
1659
1660 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1661 {
1662         unsigned int loop;
1663         int ret;
1664
1665         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1666                 ret = nfs4_wait_clnt_recover(clp);
1667                 if (ret != 0)
1668                         break;
1669                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1670                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1671                         break;
1672                 nfs4_schedule_state_manager(clp);
1673                 ret = -EIO;
1674         }
1675         return ret;
1676 }
1677
1678 static int nfs4_recover_expired_lease(struct nfs_server *server)
1679 {
1680         return nfs4_client_recover_expired_lease(server->nfs_client);
1681 }
1682
1683 /*
1684  * OPEN_EXPIRED:
1685  *      reclaim state on the server after a network partition.
1686  *      Assumes caller holds the appropriate lock
1687  */
1688 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1689 {
1690         struct nfs4_opendata *opendata;
1691         int ret;
1692
1693         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1694         if (IS_ERR(opendata))
1695                 return PTR_ERR(opendata);
1696         ret = nfs4_open_recover(opendata, state);
1697         if (ret == -ESTALE)
1698                 d_drop(ctx->dentry);
1699         nfs4_opendata_put(opendata);
1700         return ret;
1701 }
1702
1703 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1704 {
1705         struct nfs_server *server = NFS_SERVER(state->inode);
1706         struct nfs4_exception exception = { };
1707         int err;
1708
1709         do {
1710                 err = _nfs4_open_expired(ctx, state);
1711                 switch (err) {
1712                 default:
1713                         goto out;
1714                 case -NFS4ERR_GRACE:
1715                 case -NFS4ERR_DELAY:
1716                         nfs4_handle_exception(server, err, &exception);
1717                         err = 0;
1718                 }
1719         } while (exception.retry);
1720 out:
1721         return err;
1722 }
1723
1724 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1725 {
1726         struct nfs_open_context *ctx;
1727         int ret;
1728
1729         ctx = nfs4_state_find_open_context(state);
1730         if (IS_ERR(ctx))
1731                 return PTR_ERR(ctx);
1732         ret = nfs4_do_open_expired(ctx, state);
1733         put_nfs_open_context(ctx);
1734         return ret;
1735 }
1736
1737 #if defined(CONFIG_NFS_V4_1)
1738 static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1739 {
1740         int status = NFS_OK;
1741         struct nfs_server *server = NFS_SERVER(state->inode);
1742
1743         if (state->flags & flags) {
1744                 status = nfs41_test_stateid(server, stateid);
1745                 if (status != NFS_OK) {
1746                         nfs41_free_stateid(server, stateid);
1747                         state->flags &= ~flags;
1748                 }
1749         }
1750         return status;
1751 }
1752
1753 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1754 {
1755         int deleg_status, open_status;
1756         int deleg_flags = 1 << NFS_DELEGATED_STATE;
1757         int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1758
1759         deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1760         open_status = nfs41_check_expired_stateid(state,  &state->open_stateid, open_flags);
1761
1762         if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1763                 return NFS_OK;
1764         return nfs4_open_expired(sp, state);
1765 }
1766 #endif
1767
1768 /*
1769  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1770  * fields corresponding to attributes that were used to store the verifier.
1771  * Make sure we clobber those fields in the later setattr call
1772  */
1773 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1774 {
1775         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1776             !(sattr->ia_valid & ATTR_ATIME_SET))
1777                 sattr->ia_valid |= ATTR_ATIME;
1778
1779         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1780             !(sattr->ia_valid & ATTR_MTIME_SET))
1781                 sattr->ia_valid |= ATTR_MTIME;
1782 }
1783
1784 /*
1785  * Returns a referenced nfs4_state
1786  */
1787 static int _nfs4_do_open(struct inode *dir,
1788                         struct dentry *dentry,
1789                         fmode_t fmode,
1790                         int flags,
1791                         struct iattr *sattr,
1792                         struct rpc_cred *cred,
1793                         struct nfs4_state **res,
1794                         struct nfs4_threshold **ctx_th)
1795 {
1796         struct nfs4_state_owner  *sp;
1797         struct nfs4_state     *state = NULL;
1798         struct nfs_server       *server = NFS_SERVER(dir);
1799         struct nfs4_opendata *opendata;
1800         int status;
1801
1802         /* Protect against reboot recovery conflicts */
1803         status = -ENOMEM;
1804         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1805         if (sp == NULL) {
1806                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1807                 goto out_err;
1808         }
1809         status = nfs4_recover_expired_lease(server);
1810         if (status != 0)
1811                 goto err_put_state_owner;
1812         if (dentry->d_inode != NULL)
1813                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1814         status = -ENOMEM;
1815         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1816         if (opendata == NULL)
1817                 goto err_put_state_owner;
1818
1819         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1820                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1821                 if (!opendata->f_attr.mdsthreshold)
1822                         goto err_opendata_put;
1823         }
1824         if (dentry->d_inode != NULL)
1825                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1826
1827         status = _nfs4_proc_open(opendata);
1828         if (status != 0)
1829                 goto err_opendata_put;
1830
1831         state = nfs4_opendata_to_nfs4_state(opendata);
1832         status = PTR_ERR(state);
1833         if (IS_ERR(state))
1834                 goto err_opendata_put;
1835         if (server->caps & NFS_CAP_POSIX_LOCK)
1836                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1837
1838         if (opendata->o_arg.open_flags & O_EXCL) {
1839                 nfs4_exclusive_attrset(opendata, sattr);
1840
1841                 nfs_fattr_init(opendata->o_res.f_attr);
1842                 status = nfs4_do_setattr(state->inode, cred,
1843                                 opendata->o_res.f_attr, sattr,
1844                                 state);
1845                 if (status == 0)
1846                         nfs_setattr_update_inode(state->inode, sattr);
1847                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1848         }
1849
1850         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1851                 *ctx_th = opendata->f_attr.mdsthreshold;
1852         else
1853                 kfree(opendata->f_attr.mdsthreshold);
1854         opendata->f_attr.mdsthreshold = NULL;
1855
1856         nfs4_opendata_put(opendata);
1857         nfs4_put_state_owner(sp);
1858         *res = state;
1859         return 0;
1860 err_opendata_put:
1861         kfree(opendata->f_attr.mdsthreshold);
1862         nfs4_opendata_put(opendata);
1863 err_put_state_owner:
1864         nfs4_put_state_owner(sp);
1865 out_err:
1866         *res = NULL;
1867         return status;
1868 }
1869
1870
1871 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1872                                         struct dentry *dentry,
1873                                         fmode_t fmode,
1874                                         int flags,
1875                                         struct iattr *sattr,
1876                                         struct rpc_cred *cred,
1877                                         struct nfs4_threshold **ctx_th)
1878 {
1879         struct nfs4_exception exception = { };
1880         struct nfs4_state *res;
1881         int status;
1882
1883         do {
1884                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1885                                        &res, ctx_th);
1886                 if (status == 0)
1887                         break;
1888                 /* NOTE: BAD_SEQID means the server and client disagree about the
1889                  * book-keeping w.r.t. state-changing operations
1890                  * (OPEN/CLOSE/LOCK/LOCKU...)
1891                  * It is actually a sign of a bug on the client or on the server.
1892                  *
1893                  * If we receive a BAD_SEQID error in the particular case of
1894                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1895                  * have unhashed the old state_owner for us, and that we can
1896                  * therefore safely retry using a new one. We should still warn
1897                  * the user though...
1898                  */
1899                 if (status == -NFS4ERR_BAD_SEQID) {
1900                         pr_warn_ratelimited("NFS: v4 server %s "
1901                                         " returned a bad sequence-id error!\n",
1902                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1903                         exception.retry = 1;
1904                         continue;
1905                 }
1906                 /*
1907                  * BAD_STATEID on OPEN means that the server cancelled our
1908                  * state before it received the OPEN_CONFIRM.
1909                  * Recover by retrying the request as per the discussion
1910                  * on Page 181 of RFC3530.
1911                  */
1912                 if (status == -NFS4ERR_BAD_STATEID) {
1913                         exception.retry = 1;
1914                         continue;
1915                 }
1916                 if (status == -EAGAIN) {
1917                         /* We must have found a delegation */
1918                         exception.retry = 1;
1919                         continue;
1920                 }
1921                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1922                                         status, &exception));
1923         } while (exception.retry);
1924         return res;
1925 }
1926
1927 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1928                             struct nfs_fattr *fattr, struct iattr *sattr,
1929                             struct nfs4_state *state)
1930 {
1931         struct nfs_server *server = NFS_SERVER(inode);
1932         struct nfs_setattrargs  arg = {
1933                 .fh             = NFS_FH(inode),
1934                 .iap            = sattr,
1935                 .server         = server,
1936                 .bitmask = server->attr_bitmask,
1937         };
1938         struct nfs_setattrres  res = {
1939                 .fattr          = fattr,
1940                 .server         = server,
1941         };
1942         struct rpc_message msg = {
1943                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1944                 .rpc_argp       = &arg,
1945                 .rpc_resp       = &res,
1946                 .rpc_cred       = cred,
1947         };
1948         unsigned long timestamp = jiffies;
1949         int status;
1950
1951         nfs_fattr_init(fattr);
1952
1953         if (state != NULL) {
1954                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1955                                 current->files, current->tgid);
1956         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1957                                 FMODE_WRITE)) {
1958                 /* Use that stateid */
1959         } else
1960                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1961
1962         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1963         if (status == 0 && state != NULL)
1964                 renew_lease(server, timestamp);
1965         return status;
1966 }
1967
1968 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1969                            struct nfs_fattr *fattr, struct iattr *sattr,
1970                            struct nfs4_state *state)
1971 {
1972         struct nfs_server *server = NFS_SERVER(inode);
1973         struct nfs4_exception exception = {
1974                 .state = state,
1975                 .inode = inode,
1976         };
1977         int err;
1978         do {
1979                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
1980                 switch (err) {
1981                 case -NFS4ERR_OPENMODE:
1982                         if (state && !(state->state & FMODE_WRITE)) {
1983                                 err = -EBADF;
1984                                 if (sattr->ia_valid & ATTR_OPEN)
1985                                         err = -EACCES;
1986                                 goto out;
1987                         }
1988                 }
1989                 err = nfs4_handle_exception(server, err, &exception);
1990         } while (exception.retry);
1991 out:
1992         return err;
1993 }
1994
1995 struct nfs4_closedata {
1996         struct inode *inode;
1997         struct nfs4_state *state;
1998         struct nfs_closeargs arg;
1999         struct nfs_closeres res;
2000         struct nfs_fattr fattr;
2001         unsigned long timestamp;
2002         bool roc;
2003         u32 roc_barrier;
2004 };
2005
2006 static void nfs4_free_closedata(void *data)
2007 {
2008         struct nfs4_closedata *calldata = data;
2009         struct nfs4_state_owner *sp = calldata->state->owner;
2010         struct super_block *sb = calldata->state->inode->i_sb;
2011
2012         if (calldata->roc)
2013                 pnfs_roc_release(calldata->state->inode);
2014         nfs4_put_open_state(calldata->state);
2015         nfs_free_seqid(calldata->arg.seqid);
2016         nfs4_put_state_owner(sp);
2017         nfs_sb_deactive(sb);
2018         kfree(calldata);
2019 }
2020
2021 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2022                 fmode_t fmode)
2023 {
2024         spin_lock(&state->owner->so_lock);
2025         if (!(fmode & FMODE_READ))
2026                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2027         if (!(fmode & FMODE_WRITE))
2028                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2029         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2030         spin_unlock(&state->owner->so_lock);
2031 }
2032
2033 static void nfs4_close_done(struct rpc_task *task, void *data)
2034 {
2035         struct nfs4_closedata *calldata = data;
2036         struct nfs4_state *state = calldata->state;
2037         struct nfs_server *server = NFS_SERVER(calldata->inode);
2038
2039         dprintk("%s: begin!\n", __func__);
2040         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2041                 return;
2042         /* hmm. we are done with the inode, and in the process of freeing
2043          * the state_owner. we keep this around to process errors
2044          */
2045         switch (task->tk_status) {
2046                 case 0:
2047                         if (calldata->roc)
2048                                 pnfs_roc_set_barrier(state->inode,
2049                                                      calldata->roc_barrier);
2050                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2051                         renew_lease(server, calldata->timestamp);
2052                         nfs4_close_clear_stateid_flags(state,
2053                                         calldata->arg.fmode);
2054                         break;
2055                 case -NFS4ERR_STALE_STATEID:
2056                 case -NFS4ERR_OLD_STATEID:
2057                 case -NFS4ERR_BAD_STATEID:
2058                 case -NFS4ERR_EXPIRED:
2059                         if (calldata->arg.fmode == 0)
2060                                 break;
2061                 default:
2062                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2063                                 rpc_restart_call_prepare(task);
2064         }
2065         nfs_release_seqid(calldata->arg.seqid);
2066         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2067         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2068 }
2069
2070 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2071 {
2072         struct nfs4_closedata *calldata = data;
2073         struct nfs4_state *state = calldata->state;
2074         int call_close = 0;
2075
2076         dprintk("%s: begin!\n", __func__);
2077         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2078                 return;
2079
2080         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2081         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2082         spin_lock(&state->owner->so_lock);
2083         /* Calculate the change in open mode */
2084         if (state->n_rdwr == 0) {
2085                 if (state->n_rdonly == 0) {
2086                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2087                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2088                         calldata->arg.fmode &= ~FMODE_READ;
2089                 }
2090                 if (state->n_wronly == 0) {
2091                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2092                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2093                         calldata->arg.fmode &= ~FMODE_WRITE;
2094                 }
2095         }
2096         spin_unlock(&state->owner->so_lock);
2097
2098         if (!call_close) {
2099                 /* Note: exit _without_ calling nfs4_close_done */
2100                 task->tk_action = NULL;
2101                 goto out;
2102         }
2103
2104         if (calldata->arg.fmode == 0) {
2105                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2106                 if (calldata->roc &&
2107                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2108                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2109                                      task, NULL);
2110                         goto out;
2111                 }
2112         }
2113
2114         nfs_fattr_init(calldata->res.fattr);
2115         calldata->timestamp = jiffies;
2116         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2117                                 &calldata->arg.seq_args,
2118                                 &calldata->res.seq_res,
2119                                 task))
2120                 goto out;
2121         rpc_call_start(task);
2122 out:
2123         dprintk("%s: done!\n", __func__);
2124 }
2125
2126 static const struct rpc_call_ops nfs4_close_ops = {
2127         .rpc_call_prepare = nfs4_close_prepare,
2128         .rpc_call_done = nfs4_close_done,
2129         .rpc_release = nfs4_free_closedata,
2130 };
2131
2132 /*
2133  * It is possible for data to be read/written from a mem-mapped file
2134  * after the sys_close call (which hits the vfs layer as a flush).
2135  * This means that we can't safely call nfsv4 close on a file until
2136  * the inode is cleared. This in turn means that we are not good
2137  * NFSv4 citizens - we do not indicate to the server to update the file's
2138  * share state even when we are done with one of the three share
2139  * stateid's in the inode.
2140  *
2141  * NOTE: Caller must be holding the sp->so_owner semaphore!
2142  */
2143 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2144 {
2145         struct nfs_server *server = NFS_SERVER(state->inode);
2146         struct nfs4_closedata *calldata;
2147         struct nfs4_state_owner *sp = state->owner;
2148         struct rpc_task *task;
2149         struct rpc_message msg = {
2150                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2151                 .rpc_cred = state->owner->so_cred,
2152         };
2153         struct rpc_task_setup task_setup_data = {
2154                 .rpc_client = server->client,
2155                 .rpc_message = &msg,
2156                 .callback_ops = &nfs4_close_ops,
2157                 .workqueue = nfsiod_workqueue,
2158                 .flags = RPC_TASK_ASYNC,
2159         };
2160         int status = -ENOMEM;
2161
2162         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2163         if (calldata == NULL)
2164                 goto out;
2165         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2166         calldata->inode = state->inode;
2167         calldata->state = state;
2168         calldata->arg.fh = NFS_FH(state->inode);
2169         calldata->arg.stateid = &state->open_stateid;
2170         /* Serialization for the sequence id */
2171         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2172         if (calldata->arg.seqid == NULL)
2173                 goto out_free_calldata;
2174         calldata->arg.fmode = 0;
2175         calldata->arg.bitmask = server->cache_consistency_bitmask;
2176         calldata->res.fattr = &calldata->fattr;
2177         calldata->res.seqid = calldata->arg.seqid;
2178         calldata->res.server = server;
2179         calldata->roc = roc;
2180         nfs_sb_active(calldata->inode->i_sb);
2181
2182         msg.rpc_argp = &calldata->arg;
2183         msg.rpc_resp = &calldata->res;
2184         task_setup_data.callback_data = calldata;
2185         task = rpc_run_task(&task_setup_data);
2186         if (IS_ERR(task))
2187                 return PTR_ERR(task);
2188         status = 0;
2189         if (wait)
2190                 status = rpc_wait_for_completion_task(task);
2191         rpc_put_task(task);
2192         return status;
2193 out_free_calldata:
2194         kfree(calldata);
2195 out:
2196         if (roc)
2197                 pnfs_roc_release(state->inode);
2198         nfs4_put_open_state(state);
2199         nfs4_put_state_owner(sp);
2200         return status;
2201 }
2202
2203 static struct inode *
2204 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2205 {
2206         struct nfs4_state *state;
2207
2208         /* Protect against concurrent sillydeletes */
2209         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2210                              ctx->cred, &ctx->mdsthreshold);
2211         if (IS_ERR(state))
2212                 return ERR_CAST(state);
2213         ctx->state = state;
2214         return igrab(state->inode);
2215 }
2216
2217 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2218 {
2219         if (ctx->state == NULL)
2220                 return;
2221         if (is_sync)
2222                 nfs4_close_sync(ctx->state, ctx->mode);
2223         else
2224                 nfs4_close_state(ctx->state, ctx->mode);
2225 }
2226
2227 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2228 {
2229         struct nfs4_server_caps_arg args = {
2230                 .fhandle = fhandle,
2231         };
2232         struct nfs4_server_caps_res res = {};
2233         struct rpc_message msg = {
2234                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2235                 .rpc_argp = &args,
2236                 .rpc_resp = &res,
2237         };
2238         int status;
2239
2240         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2241         if (status == 0) {
2242                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2243                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2244                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2245                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2246                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2247                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2248                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2249                         server->caps |= NFS_CAP_ACLS;
2250                 if (res.has_links != 0)
2251                         server->caps |= NFS_CAP_HARDLINKS;
2252                 if (res.has_symlinks != 0)
2253                         server->caps |= NFS_CAP_SYMLINKS;
2254                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2255                         server->caps |= NFS_CAP_FILEID;
2256                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2257                         server->caps |= NFS_CAP_MODE;
2258                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2259                         server->caps |= NFS_CAP_NLINK;
2260                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2261                         server->caps |= NFS_CAP_OWNER;
2262                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2263                         server->caps |= NFS_CAP_OWNER_GROUP;
2264                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2265                         server->caps |= NFS_CAP_ATIME;
2266                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2267                         server->caps |= NFS_CAP_CTIME;
2268                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2269                         server->caps |= NFS_CAP_MTIME;
2270
2271                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2272                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2273                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2274                 server->acl_bitmask = res.acl_bitmask;
2275                 server->fh_expire_type = res.fh_expire_type;
2276         }
2277
2278         return status;
2279 }
2280
2281 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2282 {
2283         struct nfs4_exception exception = { };
2284         int err;
2285         do {
2286                 err = nfs4_handle_exception(server,
2287                                 _nfs4_server_capabilities(server, fhandle),
2288                                 &exception);
2289         } while (exception.retry);
2290         return err;
2291 }
2292
2293 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2294                 struct nfs_fsinfo *info)
2295 {
2296         struct nfs4_lookup_root_arg args = {
2297                 .bitmask = nfs4_fattr_bitmap,
2298         };
2299         struct nfs4_lookup_res res = {
2300                 .server = server,
2301                 .fattr = info->fattr,
2302                 .fh = fhandle,
2303         };
2304         struct rpc_message msg = {
2305                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2306                 .rpc_argp = &args,
2307                 .rpc_resp = &res,
2308         };
2309
2310         nfs_fattr_init(info->fattr);
2311         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2312 }
2313
2314 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2315                 struct nfs_fsinfo *info)
2316 {
2317         struct nfs4_exception exception = { };
2318         int err;
2319         do {
2320                 err = _nfs4_lookup_root(server, fhandle, info);
2321                 switch (err) {
2322                 case 0:
2323                 case -NFS4ERR_WRONGSEC:
2324                         goto out;
2325                 default:
2326                         err = nfs4_handle_exception(server, err, &exception);
2327                 }
2328         } while (exception.retry);
2329 out:
2330         return err;
2331 }
2332
2333 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2334                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2335 {
2336         struct rpc_auth *auth;
2337         int ret;
2338
2339         auth = rpcauth_create(flavor, server->client);
2340         if (!auth) {
2341                 ret = -EIO;
2342                 goto out;
2343         }
2344         ret = nfs4_lookup_root(server, fhandle, info);
2345 out:
2346         return ret;
2347 }
2348
2349 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2350                               struct nfs_fsinfo *info)
2351 {
2352         int i, len, status = 0;
2353         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2354
2355         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2356         flav_array[len] = RPC_AUTH_NULL;
2357         len += 1;
2358
2359         for (i = 0; i < len; i++) {
2360                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2361                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2362                         continue;
2363                 break;
2364         }
2365         /*
2366          * -EACCESS could mean that the user doesn't have correct permissions
2367          * to access the mount.  It could also mean that we tried to mount
2368          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2369          * existing mount programs don't handle -EACCES very well so it should
2370          * be mapped to -EPERM instead.
2371          */
2372         if (status == -EACCES)
2373                 status = -EPERM;
2374         return status;
2375 }
2376
2377 /*
2378  * get the file handle for the "/" directory on the server
2379  */
2380 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2381                          struct nfs_fsinfo *info)
2382 {
2383         int minor_version = server->nfs_client->cl_minorversion;
2384         int status = nfs4_lookup_root(server, fhandle, info);
2385         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2386                 /*
2387                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2388                  * by nfs4_map_errors() as this function exits.
2389                  */
2390                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2391         if (status == 0)
2392                 status = nfs4_server_capabilities(server, fhandle);
2393         if (status == 0)
2394                 status = nfs4_do_fsinfo(server, fhandle, info);
2395         return nfs4_map_errors(status);
2396 }
2397
2398 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2399                               struct nfs_fsinfo *info)
2400 {
2401         int error;
2402         struct nfs_fattr *fattr = info->fattr;
2403
2404         error = nfs4_server_capabilities(server, mntfh);
2405         if (error < 0) {
2406                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2407                 return error;
2408         }
2409
2410         error = nfs4_proc_getattr(server, mntfh, fattr);
2411         if (error < 0) {
2412                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2413                 return error;
2414         }
2415
2416         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2417             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2418                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2419
2420         return error;
2421 }
2422
2423 /*
2424  * Get locations and (maybe) other attributes of a referral.
2425  * Note that we'll actually follow the referral later when
2426  * we detect fsid mismatch in inode revalidation
2427  */
2428 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2429                              const struct qstr *name, struct nfs_fattr *fattr,
2430                              struct nfs_fh *fhandle)
2431 {
2432         int status = -ENOMEM;
2433         struct page *page = NULL;
2434         struct nfs4_fs_locations *locations = NULL;
2435
2436         page = alloc_page(GFP_KERNEL);
2437         if (page == NULL)
2438                 goto out;
2439         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2440         if (locations == NULL)
2441                 goto out;
2442
2443         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2444         if (status != 0)
2445                 goto out;
2446         /* Make sure server returned a different fsid for the referral */
2447         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2448                 dprintk("%s: server did not return a different fsid for"
2449                         " a referral at %s\n", __func__, name->name);
2450                 status = -EIO;
2451                 goto out;
2452         }
2453         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2454         nfs_fixup_referral_attributes(&locations->fattr);
2455
2456         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2457         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2458         memset(fhandle, 0, sizeof(struct nfs_fh));
2459 out:
2460         if (page)
2461                 __free_page(page);
2462         kfree(locations);
2463         return status;
2464 }
2465
2466 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2467 {
2468         struct nfs4_getattr_arg args = {
2469                 .fh = fhandle,
2470                 .bitmask = server->attr_bitmask,
2471         };
2472         struct nfs4_getattr_res res = {
2473                 .fattr = fattr,
2474                 .server = server,
2475         };
2476         struct rpc_message msg = {
2477                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2478                 .rpc_argp = &args,
2479                 .rpc_resp = &res,
2480         };
2481
2482         nfs_fattr_init(fattr);
2483         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2484 }
2485
2486 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2487 {
2488         struct nfs4_exception exception = { };
2489         int err;
2490         do {
2491                 err = nfs4_handle_exception(server,
2492                                 _nfs4_proc_getattr(server, fhandle, fattr),
2493                                 &exception);
2494         } while (exception.retry);
2495         return err;
2496 }
2497
2498 /*
2499  * The file is not closed if it is opened due to the a request to change
2500  * the size of the file. The open call will not be needed once the
2501  * VFS layer lookup-intents are implemented.
2502  *
2503  * Close is called when the inode is destroyed.
2504  * If we haven't opened the file for O_WRONLY, we
2505  * need to in the size_change case to obtain a stateid.
2506  *
2507  * Got race?
2508  * Because OPEN is always done by name in nfsv4, it is
2509  * possible that we opened a different file by the same
2510  * name.  We can recognize this race condition, but we
2511  * can't do anything about it besides returning an error.
2512  *
2513  * This will be fixed with VFS changes (lookup-intent).
2514  */
2515 static int
2516 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2517                   struct iattr *sattr)
2518 {
2519         struct inode *inode = dentry->d_inode;
2520         struct rpc_cred *cred = NULL;
2521         struct nfs4_state *state = NULL;
2522         int status;
2523
2524         if (pnfs_ld_layoutret_on_setattr(inode))
2525                 pnfs_return_layout(inode);
2526
2527         nfs_fattr_init(fattr);
2528
2529         /* Search for an existing open(O_WRITE) file */
2530         if (sattr->ia_valid & ATTR_FILE) {
2531                 struct nfs_open_context *ctx;
2532
2533                 ctx = nfs_file_open_context(sattr->ia_file);
2534                 if (ctx) {
2535                         cred = ctx->cred;
2536                         state = ctx->state;
2537                 }
2538         }
2539
2540         /* Deal with open(O_TRUNC) */
2541         if (sattr->ia_valid & ATTR_OPEN)
2542                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2543
2544         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2545         if (status == 0)
2546                 nfs_setattr_update_inode(inode, sattr);
2547         return status;
2548 }
2549
2550 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2551                 const struct qstr *name, struct nfs_fh *fhandle,
2552                 struct nfs_fattr *fattr)
2553 {
2554         struct nfs_server *server = NFS_SERVER(dir);
2555         int                    status;
2556         struct nfs4_lookup_arg args = {
2557                 .bitmask = server->attr_bitmask,
2558                 .dir_fh = NFS_FH(dir),
2559                 .name = name,
2560         };
2561         struct nfs4_lookup_res res = {
2562                 .server = server,
2563                 .fattr = fattr,
2564                 .fh = fhandle,
2565         };
2566         struct rpc_message msg = {
2567                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2568                 .rpc_argp = &args,
2569                 .rpc_resp = &res,
2570         };
2571
2572         nfs_fattr_init(fattr);
2573
2574         dprintk("NFS call  lookup %s\n", name->name);
2575         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2576         dprintk("NFS reply lookup: %d\n", status);
2577         return status;
2578 }
2579
2580 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2581 {
2582         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2583                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2584         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2585         fattr->nlink = 2;
2586 }
2587
2588 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2589                                    struct qstr *name, struct nfs_fh *fhandle,
2590                                    struct nfs_fattr *fattr)
2591 {
2592         struct nfs4_exception exception = { };
2593         struct rpc_clnt *client = *clnt;
2594         int err;
2595         do {
2596                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2597                 switch (err) {
2598                 case -NFS4ERR_BADNAME:
2599                         err = -ENOENT;
2600                         goto out;
2601                 case -NFS4ERR_MOVED:
2602                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2603                         goto out;
2604                 case -NFS4ERR_WRONGSEC:
2605                         err = -EPERM;
2606                         if (client != *clnt)
2607                                 goto out;
2608
2609                         client = nfs4_create_sec_client(client, dir, name);
2610                         if (IS_ERR(client))
2611                                 return PTR_ERR(client);
2612
2613                         exception.retry = 1;
2614                         break;
2615                 default:
2616                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2617                 }
2618         } while (exception.retry);
2619
2620 out:
2621         if (err == 0)
2622                 *clnt = client;
2623         else if (client != *clnt)
2624                 rpc_shutdown_client(client);
2625
2626         return err;
2627 }
2628
2629 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2630                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2631 {
2632         int status;
2633         struct rpc_clnt *client = NFS_CLIENT(dir);
2634
2635         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2636         if (client != NFS_CLIENT(dir)) {
2637                 rpc_shutdown_client(client);
2638                 nfs_fixup_secinfo_attributes(fattr);
2639         }
2640         return status;
2641 }
2642
2643 struct rpc_clnt *
2644 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2645                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2646 {
2647         int status;
2648         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2649
2650         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2651         if (status < 0) {
2652                 rpc_shutdown_client(client);
2653                 return ERR_PTR(status);
2654         }
2655         return client;
2656 }
2657
2658 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2659 {
2660         struct nfs_server *server = NFS_SERVER(inode);
2661         struct nfs4_accessargs args = {
2662                 .fh = NFS_FH(inode),
2663                 .bitmask = server->cache_consistency_bitmask,
2664         };
2665         struct nfs4_accessres res = {
2666                 .server = server,
2667         };
2668         struct rpc_message msg = {
2669                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2670                 .rpc_argp = &args,
2671                 .rpc_resp = &res,
2672                 .rpc_cred = entry->cred,
2673         };
2674         int mode = entry->mask;
2675         int status;
2676
2677         /*
2678          * Determine which access bits we want to ask for...
2679          */
2680         if (mode & MAY_READ)
2681                 args.access |= NFS4_ACCESS_READ;
2682         if (S_ISDIR(inode->i_mode)) {
2683                 if (mode & MAY_WRITE)
2684                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2685                 if (mode & MAY_EXEC)
2686                         args.access |= NFS4_ACCESS_LOOKUP;
2687         } else {
2688                 if (mode & MAY_WRITE)
2689                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2690                 if (mode & MAY_EXEC)
2691                         args.access |= NFS4_ACCESS_EXECUTE;
2692         }
2693
2694         res.fattr = nfs_alloc_fattr();
2695         if (res.fattr == NULL)
2696                 return -ENOMEM;
2697
2698         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2699         if (!status) {
2700                 entry->mask = 0;
2701                 if (res.access & NFS4_ACCESS_READ)
2702                         entry->mask |= MAY_READ;
2703                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2704                         entry->mask |= MAY_WRITE;
2705                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2706                         entry->mask |= MAY_EXEC;
2707                 nfs_refresh_inode(inode, res.fattr);
2708         }
2709         nfs_free_fattr(res.fattr);
2710         return status;
2711 }
2712
2713 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2714 {
2715         struct nfs4_exception exception = { };
2716         int err;
2717         do {
2718                 err = nfs4_handle_exception(NFS_SERVER(inode),
2719                                 _nfs4_proc_access(inode, entry),
2720                                 &exception);
2721         } while (exception.retry);
2722         return err;
2723 }
2724
2725 /*
2726  * TODO: For the time being, we don't try to get any attributes
2727  * along with any of the zero-copy operations READ, READDIR,
2728  * READLINK, WRITE.
2729  *
2730  * In the case of the first three, we want to put the GETATTR
2731  * after the read-type operation -- this is because it is hard
2732  * to predict the length of a GETATTR response in v4, and thus
2733  * align the READ data correctly.  This means that the GETATTR
2734  * may end up partially falling into the page cache, and we should
2735  * shift it into the 'tail' of the xdr_buf before processing.
2736  * To do this efficiently, we need to know the total length
2737  * of data received, which doesn't seem to be available outside
2738  * of the RPC layer.
2739  *
2740  * In the case of WRITE, we also want to put the GETATTR after
2741  * the operation -- in this case because we want to make sure
2742  * we get the post-operation mtime and size.  This means that
2743  * we can't use xdr_encode_pages() as written: we need a variant
2744  * of it which would leave room in the 'tail' iovec.
2745  *
2746  * Both of these changes to the XDR layer would in fact be quite
2747  * minor, but I decided to leave them for a subsequent patch.
2748  */
2749 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2750                 unsigned int pgbase, unsigned int pglen)
2751 {
2752         struct nfs4_readlink args = {
2753                 .fh       = NFS_FH(inode),
2754                 .pgbase   = pgbase,
2755                 .pglen    = pglen,
2756                 .pages    = &page,
2757         };
2758         struct nfs4_readlink_res res;
2759         struct rpc_message msg = {
2760                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2761                 .rpc_argp = &args,
2762                 .rpc_resp = &res,
2763         };
2764
2765         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2766 }
2767
2768 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2769                 unsigned int pgbase, unsigned int pglen)
2770 {
2771         struct nfs4_exception exception = { };
2772         int err;
2773         do {
2774                 err = nfs4_handle_exception(NFS_SERVER(inode),
2775                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2776                                 &exception);
2777         } while (exception.retry);
2778         return err;
2779 }
2780
2781 /*
2782  * Got race?
2783  * We will need to arrange for the VFS layer to provide an atomic open.
2784  * Until then, this create/open method is prone to inefficiency and race
2785  * conditions due to the lookup, create, and open VFS calls from sys_open()
2786  * placed on the wire.
2787  *
2788  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2789  * The file will be opened again in the subsequent VFS open call
2790  * (nfs4_proc_file_open).
2791  *
2792  * The open for read will just hang around to be used by any process that
2793  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2794  */
2795
2796 static int
2797 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2798                  int flags, struct nfs_open_context *ctx)
2799 {
2800         struct dentry *de = dentry;
2801         struct nfs4_state *state;
2802         struct rpc_cred *cred = NULL;
2803         fmode_t fmode = 0;
2804         int status = 0;
2805
2806         if (ctx != NULL) {
2807                 cred = ctx->cred;
2808                 de = ctx->dentry;
2809                 fmode = ctx->mode;
2810         }
2811         sattr->ia_mode &= ~current_umask();
2812         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred, NULL);
2813         d_drop(dentry);
2814         if (IS_ERR(state)) {
2815                 status = PTR_ERR(state);
2816                 goto out;
2817         }
2818         d_add(dentry, igrab(state->inode));
2819         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2820         if (ctx != NULL)
2821                 ctx->state = state;
2822         else
2823                 nfs4_close_sync(state, fmode);
2824 out:
2825         return status;
2826 }
2827
2828 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2829 {
2830         struct nfs_server *server = NFS_SERVER(dir);
2831         struct nfs_removeargs args = {
2832                 .fh = NFS_FH(dir),
2833                 .name = *name,
2834         };
2835         struct nfs_removeres res = {
2836                 .server = server,
2837         };
2838         struct rpc_message msg = {
2839                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2840                 .rpc_argp = &args,
2841                 .rpc_resp = &res,
2842         };
2843         int status;
2844
2845         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2846         if (status == 0)
2847                 update_changeattr(dir, &res.cinfo);
2848         return status;
2849 }
2850
2851 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2852 {
2853         struct nfs4_exception exception = { };
2854         int err;
2855         do {
2856                 err = nfs4_handle_exception(NFS_SERVER(dir),
2857                                 _nfs4_proc_remove(dir, name),
2858                                 &exception);
2859         } while (exception.retry);
2860         return err;
2861 }
2862
2863 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2864 {
2865         struct nfs_server *server = NFS_SERVER(dir);
2866         struct nfs_removeargs *args = msg->rpc_argp;
2867         struct nfs_removeres *res = msg->rpc_resp;
2868
2869         res->server = server;
2870         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2871         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2872 }
2873
2874 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2875 {
2876         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2877                                 &data->args.seq_args,
2878                                 &data->res.seq_res,
2879                                 task))
2880                 return;
2881         rpc_call_start(task);
2882 }
2883
2884 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2885 {
2886         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2887
2888         if (!nfs4_sequence_done(task, &res->seq_res))
2889                 return 0;
2890         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2891                 return 0;
2892         update_changeattr(dir, &res->cinfo);
2893         return 1;
2894 }
2895
2896 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2897 {
2898         struct nfs_server *server = NFS_SERVER(dir);
2899         struct nfs_renameargs *arg = msg->rpc_argp;
2900         struct nfs_renameres *res = msg->rpc_resp;
2901
2902         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2903         res->server = server;
2904         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2905 }
2906
2907 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2908 {
2909         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2910                                 &data->args.seq_args,
2911                                 &data->res.seq_res,
2912                                 task))
2913                 return;
2914         rpc_call_start(task);
2915 }
2916
2917 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2918                                  struct inode *new_dir)
2919 {
2920         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2921
2922         if (!nfs4_sequence_done(task, &res->seq_res))
2923                 return 0;
2924         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2925                 return 0;
2926
2927         update_changeattr(old_dir, &res->old_cinfo);
2928         update_changeattr(new_dir, &res->new_cinfo);
2929         return 1;
2930 }
2931
2932 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2933                 struct inode *new_dir, struct qstr *new_name)
2934 {
2935         struct nfs_server *server = NFS_SERVER(old_dir);
2936         struct nfs_renameargs arg = {
2937                 .old_dir = NFS_FH(old_dir),
2938                 .new_dir = NFS_FH(new_dir),
2939                 .old_name = old_name,
2940                 .new_name = new_name,
2941         };
2942         struct nfs_renameres res = {
2943                 .server = server,
2944         };
2945         struct rpc_message msg = {
2946                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2947                 .rpc_argp = &arg,
2948                 .rpc_resp = &res,
2949         };
2950         int status = -ENOMEM;
2951
2952         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2953         if (!status) {
2954                 update_changeattr(old_dir, &res.old_cinfo);
2955                 update_changeattr(new_dir, &res.new_cinfo);
2956         }
2957         return status;
2958 }
2959
2960 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2961                 struct inode *new_dir, struct qstr *new_name)
2962 {
2963         struct nfs4_exception exception = { };
2964         int err;
2965         do {
2966                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2967                                 _nfs4_proc_rename(old_dir, old_name,
2968                                         new_dir, new_name),
2969                                 &exception);
2970         } while (exception.retry);
2971         return err;
2972 }
2973
2974 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2975 {
2976         struct nfs_server *server = NFS_SERVER(inode);
2977         struct nfs4_link_arg arg = {
2978                 .fh     = NFS_FH(inode),
2979                 .dir_fh = NFS_FH(dir),
2980                 .name   = name,
2981                 .bitmask = server->attr_bitmask,
2982         };
2983         struct nfs4_link_res res = {
2984                 .server = server,
2985         };
2986         struct rpc_message msg = {
2987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2988                 .rpc_argp = &arg,
2989                 .rpc_resp = &res,
2990         };
2991         int status = -ENOMEM;
2992
2993         res.fattr = nfs_alloc_fattr();
2994         if (res.fattr == NULL)
2995                 goto out;
2996
2997         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2998         if (!status) {
2999                 update_changeattr(dir, &res.cinfo);
3000                 nfs_post_op_update_inode(inode, res.fattr);
3001         }
3002 out:
3003         nfs_free_fattr(res.fattr);
3004         return status;
3005 }
3006
3007 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3008 {
3009         struct nfs4_exception exception = { };
3010         int err;
3011         do {
3012                 err = nfs4_handle_exception(NFS_SERVER(inode),
3013                                 _nfs4_proc_link(inode, dir, name),
3014                                 &exception);
3015         } while (exception.retry);
3016         return err;
3017 }
3018
3019 struct nfs4_createdata {
3020         struct rpc_message msg;
3021         struct nfs4_create_arg arg;
3022         struct nfs4_create_res res;
3023         struct nfs_fh fh;
3024         struct nfs_fattr fattr;
3025 };
3026
3027 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3028                 struct qstr *name, struct iattr *sattr, u32 ftype)
3029 {
3030         struct nfs4_createdata *data;
3031
3032         data = kzalloc(sizeof(*data), GFP_KERNEL);
3033         if (data != NULL) {
3034                 struct nfs_server *server = NFS_SERVER(dir);
3035
3036                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3037                 data->msg.rpc_argp = &data->arg;
3038                 data->msg.rpc_resp = &data->res;
3039                 data->arg.dir_fh = NFS_FH(dir);
3040                 data->arg.server = server;
3041                 data->arg.name = name;
3042                 data->arg.attrs = sattr;
3043                 data->arg.ftype = ftype;
3044                 data->arg.bitmask = server->attr_bitmask;
3045                 data->res.server = server;
3046                 data->res.fh = &data->fh;
3047                 data->res.fattr = &data->fattr;
3048                 nfs_fattr_init(data->res.fattr);
3049         }
3050         return data;
3051 }
3052
3053 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3054 {
3055         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3056                                     &data->arg.seq_args, &data->res.seq_res, 1);
3057         if (status == 0) {
3058                 update_changeattr(dir, &data->res.dir_cinfo);
3059                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3060         }
3061         return status;
3062 }
3063
3064 static void nfs4_free_createdata(struct nfs4_createdata *data)
3065 {
3066         kfree(data);
3067 }
3068
3069 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3070                 struct page *page, unsigned int len, struct iattr *sattr)
3071 {
3072         struct nfs4_createdata *data;
3073         int status = -ENAMETOOLONG;
3074
3075         if (len > NFS4_MAXPATHLEN)
3076                 goto out;
3077
3078         status = -ENOMEM;
3079         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3080         if (data == NULL)
3081                 goto out;
3082
3083         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3084         data->arg.u.symlink.pages = &page;
3085         data->arg.u.symlink.len = len;
3086
3087         status = nfs4_do_create(dir, dentry, data);
3088
3089         nfs4_free_createdata(data);
3090 out:
3091         return status;
3092 }
3093
3094 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3095                 struct page *page, unsigned int len, struct iattr *sattr)
3096 {
3097         struct nfs4_exception exception = { };
3098         int err;
3099         do {
3100                 err = nfs4_handle_exception(NFS_SERVER(dir),
3101                                 _nfs4_proc_symlink(dir, dentry, page,
3102                                                         len, sattr),
3103                                 &exception);
3104         } while (exception.retry);
3105         return err;
3106 }
3107
3108 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3109                 struct iattr *sattr)
3110 {
3111         struct nfs4_createdata *data;
3112         int status = -ENOMEM;
3113
3114         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3115         if (data == NULL)
3116                 goto out;
3117
3118         status = nfs4_do_create(dir, dentry, data);
3119
3120         nfs4_free_createdata(data);
3121 out:
3122         return status;
3123 }
3124
3125 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3126                 struct iattr *sattr)
3127 {
3128         struct nfs4_exception exception = { };
3129         int err;
3130
3131         sattr->ia_mode &= ~current_umask();
3132         do {
3133                 err = nfs4_handle_exception(NFS_SERVER(dir),
3134                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3135                                 &exception);
3136         } while (exception.retry);
3137         return err;
3138 }
3139
3140 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3141                 u64 cookie, struct page **pages, unsigned int count, int plus)
3142 {
3143         struct inode            *dir = dentry->d_inode;
3144         struct nfs4_readdir_arg args = {
3145                 .fh = NFS_FH(dir),
3146                 .pages = pages,
3147                 .pgbase = 0,
3148                 .count = count,
3149                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3150                 .plus = plus,
3151         };
3152         struct nfs4_readdir_res res;
3153         struct rpc_message msg = {
3154                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3155                 .rpc_argp = &args,
3156                 .rpc_resp = &res,
3157                 .rpc_cred = cred,
3158         };
3159         int                     status;
3160
3161         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3162                         dentry->d_parent->d_name.name,
3163                         dentry->d_name.name,
3164                         (unsigned long long)cookie);
3165         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3166         res.pgbase = args.pgbase;
3167         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3168         if (status >= 0) {
3169                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3170                 status += args.pgbase;
3171         }
3172
3173         nfs_invalidate_atime(dir);
3174
3175         dprintk("%s: returns %d\n", __func__, status);
3176         return status;
3177 }
3178
3179 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3180                 u64 cookie, struct page **pages, unsigned int count, int plus)
3181 {
3182         struct nfs4_exception exception = { };
3183         int err;
3184         do {
3185                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3186                                 _nfs4_proc_readdir(dentry, cred, cookie,
3187                                         pages, count, plus),
3188                                 &exception);
3189         } while (exception.retry);
3190         return err;
3191 }
3192
3193 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3194                 struct iattr *sattr, dev_t rdev)
3195 {
3196         struct nfs4_createdata *data;
3197         int mode = sattr->ia_mode;
3198         int status = -ENOMEM;
3199
3200         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3201         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3202
3203         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3204         if (data == NULL)
3205                 goto out;
3206
3207         if (S_ISFIFO(mode))
3208                 data->arg.ftype = NF4FIFO;
3209         else if (S_ISBLK(mode)) {
3210                 data->arg.ftype = NF4BLK;
3211                 data->arg.u.device.specdata1 = MAJOR(rdev);
3212                 data->arg.u.device.specdata2 = MINOR(rdev);
3213         }
3214         else if (S_ISCHR(mode)) {
3215                 data->arg.ftype = NF4CHR;
3216                 data->arg.u.device.specdata1 = MAJOR(rdev);
3217                 data->arg.u.device.specdata2 = MINOR(rdev);
3218         }
3219
3220         status = nfs4_do_create(dir, dentry, data);
3221
3222         nfs4_free_createdata(data);
3223 out:
3224         return status;
3225 }
3226
3227 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3228                 struct iattr *sattr, dev_t rdev)
3229 {
3230         struct nfs4_exception exception = { };
3231         int err;
3232
3233         sattr->ia_mode &= ~current_umask();
3234         do {
3235                 err = nfs4_handle_exception(NFS_SERVER(dir),
3236                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3237                                 &exception);
3238         } while (exception.retry);
3239         return err;
3240 }
3241
3242 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3243                  struct nfs_fsstat *fsstat)
3244 {
3245         struct nfs4_statfs_arg args = {
3246                 .fh = fhandle,
3247                 .bitmask = server->attr_bitmask,
3248         };
3249         struct nfs4_statfs_res res = {
3250                 .fsstat = fsstat,
3251         };
3252         struct rpc_message msg = {
3253                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3254                 .rpc_argp = &args,
3255                 .rpc_resp = &res,
3256         };
3257
3258         nfs_fattr_init(fsstat->fattr);
3259         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3260 }
3261
3262 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3263 {
3264         struct nfs4_exception exception = { };
3265         int err;
3266         do {
3267                 err = nfs4_handle_exception(server,
3268                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3269                                 &exception);
3270         } while (exception.retry);
3271         return err;
3272 }
3273
3274 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3275                 struct nfs_fsinfo *fsinfo)
3276 {
3277         struct nfs4_fsinfo_arg args = {
3278                 .fh = fhandle,
3279                 .bitmask = server->attr_bitmask,
3280         };
3281         struct nfs4_fsinfo_res res = {
3282                 .fsinfo = fsinfo,
3283         };
3284         struct rpc_message msg = {
3285                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3286                 .rpc_argp = &args,
3287                 .rpc_resp = &res,
3288         };
3289
3290         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3291 }
3292
3293 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3294 {
3295         struct nfs4_exception exception = { };
3296         int err;
3297
3298         do {
3299                 err = nfs4_handle_exception(server,
3300                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3301                                 &exception);
3302         } while (exception.retry);
3303         return err;
3304 }
3305
3306 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3307 {
3308         nfs_fattr_init(fsinfo->fattr);
3309         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3310 }
3311
3312 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3313                 struct nfs_pathconf *pathconf)
3314 {
3315         struct nfs4_pathconf_arg args = {
3316                 .fh = fhandle,
3317                 .bitmask = server->attr_bitmask,
3318         };
3319         struct nfs4_pathconf_res res = {
3320                 .pathconf = pathconf,
3321         };
3322         struct rpc_message msg = {
3323                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3324                 .rpc_argp = &args,
3325                 .rpc_resp = &res,
3326         };
3327
3328         /* None of the pathconf attributes are mandatory to implement */
3329         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3330                 memset(pathconf, 0, sizeof(*pathconf));
3331                 return 0;
3332         }
3333
3334         nfs_fattr_init(pathconf->fattr);
3335         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3336 }
3337
3338 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3339                 struct nfs_pathconf *pathconf)
3340 {
3341         struct nfs4_exception exception = { };
3342         int err;
3343
3344         do {
3345                 err = nfs4_handle_exception(server,
3346                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3347                                 &exception);
3348         } while (exception.retry);
3349         return err;
3350 }
3351
3352 void __nfs4_read_done_cb(struct nfs_read_data *data)
3353 {
3354         nfs_invalidate_atime(data->header->inode);
3355 }
3356
3357 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3358 {
3359         struct nfs_server *server = NFS_SERVER(data->header->inode);
3360
3361         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3362                 rpc_restart_call_prepare(task);
3363                 return -EAGAIN;
3364         }
3365
3366         __nfs4_read_done_cb(data);
3367         if (task->tk_status > 0)
3368                 renew_lease(server, data->timestamp);
3369         return 0;
3370 }
3371
3372 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3373 {
3374
3375         dprintk("--> %s\n", __func__);
3376
3377         if (!nfs4_sequence_done(task, &data->res.seq_res))
3378                 return -EAGAIN;
3379
3380         return data->read_done_cb ? data->read_done_cb(task, data) :
3381                                     nfs4_read_done_cb(task, data);
3382 }
3383
3384 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3385 {
3386         data->timestamp   = jiffies;
3387         data->read_done_cb = nfs4_read_done_cb;
3388         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3389         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3390 }
3391
3392 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3393 {
3394         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3395                                 &data->args.seq_args,
3396                                 &data->res.seq_res,
3397                                 task))
3398                 return;
3399         rpc_call_start(task);
3400 }
3401
3402 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3403 {
3404         struct inode *inode = data->header->inode;
3405
3406         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3407                 rpc_restart_call_prepare(task);
3408                 return -EAGAIN;
3409         }
3410         if (task->tk_status >= 0) {
3411                 renew_lease(NFS_SERVER(inode), data->timestamp);
3412                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3413         }
3414         return 0;
3415 }
3416
3417 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3418 {
3419         if (!nfs4_sequence_done(task, &data->res.seq_res))
3420                 return -EAGAIN;
3421         return data->write_done_cb ? data->write_done_cb(task, data) :
3422                 nfs4_write_done_cb(task, data);
3423 }
3424
3425 static
3426 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3427 {
3428         const struct nfs_pgio_header *hdr = data->header;
3429
3430         /* Don't request attributes for pNFS or O_DIRECT writes */
3431         if (data->ds_clp != NULL || hdr->dreq != NULL)
3432                 return false;
3433         /* Otherwise, request attributes if and only if we don't hold
3434          * a delegation
3435          */
3436         return nfs_have_delegation(hdr->inode, FMODE_READ) == 0;
3437 }
3438
3439 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3440 {
3441         struct nfs_server *server = NFS_SERVER(data->header->inode);
3442
3443         if (!nfs4_write_need_cache_consistency_data(data)) {
3444                 data->args.bitmask = NULL;
3445                 data->res.fattr = NULL;
3446         } else
3447                 data->args.bitmask = server->cache_consistency_bitmask;
3448
3449         if (!data->write_done_cb)
3450                 data->write_done_cb = nfs4_write_done_cb;
3451         data->res.server = server;
3452         data->timestamp   = jiffies;
3453
3454         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3455         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3456 }
3457
3458 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3459 {
3460         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3461                                 &data->args.seq_args,
3462                                 &data->res.seq_res,
3463                                 task))
3464                 return;
3465         rpc_call_start(task);
3466 }
3467
3468 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3469 {
3470         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3471                                 &data->args.seq_args,
3472                                 &data->res.seq_res,
3473                                 task))
3474                 return;
3475         rpc_call_start(task);
3476 }
3477
3478 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3479 {
3480         struct inode *inode = data->inode;
3481
3482         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3483                 rpc_restart_call_prepare(task);
3484                 return -EAGAIN;
3485         }
3486         return 0;
3487 }
3488
3489 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3490 {
3491         if (!nfs4_sequence_done(task, &data->res.seq_res))
3492                 return -EAGAIN;
3493         return data->commit_done_cb(task, data);
3494 }
3495
3496 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3497 {
3498         struct nfs_server *server = NFS_SERVER(data->inode);
3499
3500         if (data->commit_done_cb == NULL)
3501                 data->commit_done_cb = nfs4_commit_done_cb;
3502         data->res.server = server;
3503         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3504         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3505 }
3506
3507 struct nfs4_renewdata {
3508         struct nfs_client       *client;
3509         unsigned long           timestamp;
3510 };
3511
3512 /*
3513  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3514  * standalone procedure for queueing an asynchronous RENEW.
3515  */
3516 static void nfs4_renew_release(void *calldata)
3517 {
3518         struct nfs4_renewdata *data = calldata;
3519         struct nfs_client *clp = data->client;
3520
3521         if (atomic_read(&clp->cl_count) > 1)
3522                 nfs4_schedule_state_renewal(clp);
3523         nfs_put_client(clp);
3524         kfree(data);
3525 }
3526
3527 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3528 {
3529         struct nfs4_renewdata *data = calldata;
3530         struct nfs_client *clp = data->client;
3531         unsigned long timestamp = data->timestamp;
3532
3533         if (task->tk_status < 0) {
3534                 /* Unless we're shutting down, schedule state recovery! */
3535                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3536                         return;
3537                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3538                         nfs4_schedule_lease_recovery(clp);
3539                         return;
3540                 }
3541                 nfs4_schedule_path_down_recovery(clp);
3542         }
3543         do_renew_lease(clp, timestamp);
3544 }
3545
3546 static const struct rpc_call_ops nfs4_renew_ops = {
3547         .rpc_call_done = nfs4_renew_done,
3548         .rpc_release = nfs4_renew_release,
3549 };
3550
3551 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3552 {
3553         struct rpc_message msg = {
3554                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3555                 .rpc_argp       = clp,
3556                 .rpc_cred       = cred,
3557         };
3558         struct nfs4_renewdata *data;
3559
3560         if (renew_flags == 0)
3561                 return 0;
3562         if (!atomic_inc_not_zero(&clp->cl_count))
3563                 return -EIO;
3564         data = kmalloc(sizeof(*data), GFP_NOFS);
3565         if (data == NULL)
3566                 return -ENOMEM;
3567         data->client = clp;
3568         data->timestamp = jiffies;
3569         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3570                         &nfs4_renew_ops, data);
3571 }
3572
3573 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3574 {
3575         struct rpc_message msg = {
3576                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3577                 .rpc_argp       = clp,
3578                 .rpc_cred       = cred,
3579         };
3580         unsigned long now = jiffies;
3581         int status;
3582
3583         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3584         if (status < 0)
3585                 return status;
3586         do_renew_lease(clp, now);
3587         return 0;
3588 }
3589
3590 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3591 {
3592         return (server->caps & NFS_CAP_ACLS)
3593                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3594                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3595 }
3596
3597 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3598  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3599  * the stack.
3600  */
3601 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3602
3603 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3604                 struct page **pages, unsigned int *pgbase)
3605 {
3606         struct page *newpage, **spages;
3607         int rc = 0;
3608         size_t len;
3609         spages = pages;
3610
3611         do {
3612                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3613                 newpage = alloc_page(GFP_KERNEL);
3614
3615                 if (newpage == NULL)
3616                         goto unwind;
3617                 memcpy(page_address(newpage), buf, len);
3618                 buf += len;
3619                 buflen -= len;
3620                 *pages++ = newpage;
3621                 rc++;
3622         } while (buflen != 0);
3623
3624         return rc;
3625
3626 unwind:
3627         for(; rc > 0; rc--)
3628                 __free_page(spages[rc-1]);
3629         return -ENOMEM;
3630 }
3631
3632 struct nfs4_cached_acl {
3633         int cached;
3634         size_t len;
3635         char data[0];
3636 };
3637
3638 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3639 {
3640         struct nfs_inode *nfsi = NFS_I(inode);
3641
3642         spin_lock(&inode->i_lock);
3643         kfree(nfsi->nfs4_acl);
3644         nfsi->nfs4_acl = acl;
3645         spin_unlock(&inode->i_lock);
3646 }
3647
3648 static void nfs4_zap_acl_attr(struct inode *inode)
3649 {
3650         nfs4_set_cached_acl(inode, NULL);
3651 }
3652
3653 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3654 {
3655         struct nfs_inode *nfsi = NFS_I(inode);
3656         struct nfs4_cached_acl *acl;
3657         int ret = -ENOENT;
3658
3659         spin_lock(&inode->i_lock);
3660         acl = nfsi->nfs4_acl;
3661         if (acl == NULL)
3662                 goto out;
3663         if (buf == NULL) /* user is just asking for length */
3664                 goto out_len;
3665         if (acl->cached == 0)
3666                 goto out;
3667         ret = -ERANGE; /* see getxattr(2) man page */
3668         if (acl->len > buflen)
3669                 goto out;
3670         memcpy(buf, acl->data, acl->len);
3671 out_len:
3672         ret = acl->len;
3673 out:
3674         spin_unlock(&inode->i_lock);
3675         return ret;
3676 }
3677
3678 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3679 {
3680         struct nfs4_cached_acl *acl;
3681
3682         if (pages && acl_len <= PAGE_SIZE) {
3683                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3684                 if (acl == NULL)
3685                         goto out;
3686                 acl->cached = 1;
3687                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3688         } else {
3689                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3690                 if (acl == NULL)
3691                         goto out;
3692                 acl->cached = 0;
3693         }
3694         acl->len = acl_len;
3695 out:
3696         nfs4_set_cached_acl(inode, acl);
3697 }
3698
3699 /*
3700  * The getxattr API returns the required buffer length when called with a
3701  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3702  * the required buf.  On a NULL buf, we send a page of data to the server
3703  * guessing that the ACL request can be serviced by a page. If so, we cache
3704  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3705  * the cache. If not so, we throw away the page, and cache the required
3706  * length. The next getxattr call will then produce another round trip to
3707  * the server, this time with the input buf of the required size.
3708  */
3709 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3710 {
3711         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3712         struct nfs_getaclargs args = {
3713                 .fh = NFS_FH(inode),
3714                 .acl_pages = pages,
3715                 .acl_len = buflen,
3716         };
3717         struct nfs_getaclres res = {
3718                 .acl_len = buflen,
3719         };
3720         struct rpc_message msg = {
3721                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3722                 .rpc_argp = &args,
3723                 .rpc_resp = &res,
3724         };
3725         int ret = -ENOMEM, npages, i, acl_len = 0;
3726
3727         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3728         /* As long as we're doing a round trip to the server anyway,
3729          * let's be prepared for a page of acl data. */
3730         if (npages == 0)
3731                 npages = 1;
3732
3733         /* Add an extra page to handle the bitmap returned */
3734         npages++;
3735
3736         for (i = 0; i < npages; i++) {
3737                 pages[i] = alloc_page(GFP_KERNEL);
3738                 if (!pages[i])
3739                         goto out_free;
3740         }
3741
3742         /* for decoding across pages */
3743         res.acl_scratch = alloc_page(GFP_KERNEL);
3744         if (!res.acl_scratch)
3745                 goto out_free;
3746
3747         args.acl_len = npages * PAGE_SIZE;
3748         args.acl_pgbase = 0;
3749
3750         /* Let decode_getfacl know not to fail if the ACL data is larger than
3751          * the page we send as a guess */
3752         if (buf == NULL)
3753                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3754
3755         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3756                 __func__, buf, buflen, npages, args.acl_len);
3757         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3758                              &msg, &args.seq_args, &res.seq_res, 0);
3759         if (ret)
3760                 goto out_free;
3761
3762         acl_len = res.acl_len - res.acl_data_offset;
3763         if (acl_len > args.acl_len)
3764                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3765         else
3766                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3767                                       acl_len);
3768         if (buf) {
3769                 ret = -ERANGE;
3770                 if (acl_len > buflen)
3771                         goto out_free;
3772                 _copy_from_pages(buf, pages, res.acl_data_offset,
3773                                 acl_len);
3774         }
3775         ret = acl_len;
3776 out_free:
3777         for (i = 0; i < npages; i++)
3778                 if (pages[i])
3779                         __free_page(pages[i]);
3780         if (res.acl_scratch)
3781                 __free_page(res.acl_scratch);
3782         return ret;
3783 }
3784
3785 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3786 {
3787         struct nfs4_exception exception = { };
3788         ssize_t ret;
3789         do {
3790                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3791                 if (ret >= 0)
3792                         break;
3793                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3794         } while (exception.retry);
3795         return ret;
3796 }
3797
3798 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3799 {
3800         struct nfs_server *server = NFS_SERVER(inode);
3801         int ret;
3802
3803         if (!nfs4_server_supports_acls(server))
3804                 return -EOPNOTSUPP;
3805         ret = nfs_revalidate_inode(server, inode);
3806         if (ret < 0)
3807                 return ret;
3808         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3809                 nfs_zap_acl_cache(inode);
3810         ret = nfs4_read_cached_acl(inode, buf, buflen);
3811         if (ret != -ENOENT)
3812                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3813                  * but no cached acl data, just the acl length */
3814                 return ret;
3815         return nfs4_get_acl_uncached(inode, buf, buflen);
3816 }
3817
3818 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3819 {
3820         struct nfs_server *server = NFS_SERVER(inode);
3821         struct page *pages[NFS4ACL_MAXPAGES];
3822         struct nfs_setaclargs arg = {
3823                 .fh             = NFS_FH(inode),
3824                 .acl_pages      = pages,
3825                 .acl_len        = buflen,
3826         };
3827         struct nfs_setaclres res;
3828         struct rpc_message msg = {
3829                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3830                 .rpc_argp       = &arg,
3831                 .rpc_resp       = &res,
3832         };
3833         int ret, i;
3834
3835         if (!nfs4_server_supports_acls(server))
3836                 return -EOPNOTSUPP;
3837         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3838         if (i < 0)
3839                 return i;
3840         nfs_inode_return_delegation(inode);
3841         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3842
3843         /*
3844          * Free each page after tx, so the only ref left is
3845          * held by the network stack
3846          */
3847         for (; i > 0; i--)
3848                 put_page(pages[i-1]);
3849
3850         /*
3851          * Acl update can result in inode attribute update.
3852          * so mark the attribute cache invalid.
3853          */
3854         spin_lock(&inode->i_lock);
3855         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3856         spin_unlock(&inode->i_lock);
3857         nfs_access_zap_cache(inode);
3858         nfs_zap_acl_cache(inode);
3859         return ret;
3860 }
3861
3862 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3863 {
3864         struct nfs4_exception exception = { };
3865         int err;
3866         do {
3867                 err = nfs4_handle_exception(NFS_SERVER(inode),
3868                                 __nfs4_proc_set_acl(inode, buf, buflen),
3869                                 &exception);
3870         } while (exception.retry);
3871         return err;
3872 }
3873
3874 static int
3875 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3876 {
3877         struct nfs_client *clp = server->nfs_client;
3878
3879         if (task->tk_status >= 0)
3880                 return 0;
3881         switch(task->tk_status) {
3882                 case -NFS4ERR_DELEG_REVOKED:
3883                 case -NFS4ERR_ADMIN_REVOKED:
3884                 case -NFS4ERR_BAD_STATEID:
3885                         if (state == NULL)
3886                                 break;
3887                         nfs_remove_bad_delegation(state->inode);
3888                 case -NFS4ERR_OPENMODE:
3889                         if (state == NULL)
3890                                 break;
3891                         nfs4_schedule_stateid_recovery(server, state);
3892                         goto wait_on_recovery;
3893                 case -NFS4ERR_EXPIRED:
3894                         if (state != NULL)
3895                                 nfs4_schedule_stateid_recovery(server, state);
3896                 case -NFS4ERR_STALE_STATEID:
3897                 case -NFS4ERR_STALE_CLIENTID:
3898                         nfs4_schedule_lease_recovery(clp);
3899                         goto wait_on_recovery;
3900 #if defined(CONFIG_NFS_V4_1)
3901                 case -NFS4ERR_BADSESSION:
3902                 case -NFS4ERR_BADSLOT:
3903                 case -NFS4ERR_BAD_HIGH_SLOT:
3904                 case -NFS4ERR_DEADSESSION:
3905                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3906                 case -NFS4ERR_SEQ_FALSE_RETRY:
3907                 case -NFS4ERR_SEQ_MISORDERED:
3908                         dprintk("%s ERROR %d, Reset session\n", __func__,
3909                                 task->tk_status);
3910                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3911                         task->tk_status = 0;
3912                         return -EAGAIN;
3913 #endif /* CONFIG_NFS_V4_1 */
3914                 case -NFS4ERR_DELAY:
3915                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3916                 case -NFS4ERR_GRACE:
3917                 case -EKEYEXPIRED:
3918                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3919                         task->tk_status = 0;
3920                         return -EAGAIN;
3921                 case -NFS4ERR_RETRY_UNCACHED_REP:
3922                 case -NFS4ERR_OLD_STATEID:
3923                         task->tk_status = 0;
3924                         return -EAGAIN;
3925         }
3926         task->tk_status = nfs4_map_errors(task->tk_status);
3927         return 0;
3928 wait_on_recovery:
3929         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3930         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3931                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3932         task->tk_status = 0;
3933         return -EAGAIN;
3934 }
3935
3936 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3937                                     nfs4_verifier *bootverf)
3938 {
3939         __be32 verf[2];
3940
3941         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3942                 /* An impossible timestamp guarantees this value
3943                  * will never match a generated boot time. */
3944                 verf[0] = 0;
3945                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3946         } else {
3947                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3948                 verf[0] = (__be32)nn->boot_time.tv_sec;
3949                 verf[1] = (__be32)nn->boot_time.tv_nsec;
3950         }
3951         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3952 }
3953
3954 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3955                 unsigned short port, struct rpc_cred *cred,
3956                 struct nfs4_setclientid_res *res)
3957 {
3958         nfs4_verifier sc_verifier;
3959         struct nfs4_setclientid setclientid = {
3960                 .sc_verifier = &sc_verifier,
3961                 .sc_prog = program,
3962                 .sc_cb_ident = clp->cl_cb_ident,
3963         };
3964         struct rpc_message msg = {
3965                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3966                 .rpc_argp = &setclientid,
3967                 .rpc_resp = res,
3968                 .rpc_cred = cred,
3969         };
3970         int loop = 0;
3971         int status;
3972
3973         nfs4_init_boot_verifier(clp, &sc_verifier);
3974
3975         for(;;) {
3976                 rcu_read_lock();
3977                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3978                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3979                                 clp->cl_ipaddr,
3980                                 rpc_peeraddr2str(clp->cl_rpcclient,
3981                                                         RPC_DISPLAY_ADDR),
3982                                 rpc_peeraddr2str(clp->cl_rpcclient,
3983                                                         RPC_DISPLAY_PROTO),
3984                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3985                                 clp->cl_id_uniquifier);
3986                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3987                                 sizeof(setclientid.sc_netid),
3988                                 rpc_peeraddr2str(clp->cl_rpcclient,
3989                                                         RPC_DISPLAY_NETID));
3990                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3991                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3992                                 clp->cl_ipaddr, port >> 8, port & 255);
3993                 rcu_read_unlock();
3994
3995                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3996                 if (status != -NFS4ERR_CLID_INUSE)
3997                         break;
3998                 if (loop != 0) {
3999                         ++clp->cl_id_uniquifier;
4000                         break;
4001                 }
4002                 ++loop;
4003                 ssleep(clp->cl_lease_time / HZ + 1);
4004         }
4005         return status;
4006 }
4007
4008 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4009                 struct nfs4_setclientid_res *arg,
4010                 struct rpc_cred *cred)
4011 {
4012         struct nfs_fsinfo fsinfo;
4013         struct rpc_message msg = {
4014                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4015                 .rpc_argp = arg,
4016                 .rpc_resp = &fsinfo,
4017                 .rpc_cred = cred,
4018         };
4019         unsigned long now;
4020         int status;
4021
4022         now = jiffies;
4023         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4024         if (status == 0) {
4025                 spin_lock(&clp->cl_lock);
4026                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4027                 clp->cl_last_renewal = now;
4028                 spin_unlock(&clp->cl_lock);
4029         }
4030         return status;
4031 }
4032
4033 struct nfs4_delegreturndata {
4034         struct nfs4_delegreturnargs args;
4035         struct nfs4_delegreturnres res;
4036         struct nfs_fh fh;
4037         nfs4_stateid stateid;
4038         unsigned long timestamp;
4039         struct nfs_fattr fattr;
4040         int rpc_status;
4041 };
4042
4043 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4044 {
4045         struct nfs4_delegreturndata *data = calldata;
4046
4047         if (!nfs4_sequence_done(task, &data->res.seq_res))
4048                 return;
4049
4050         switch (task->tk_status) {
4051         case -NFS4ERR_STALE_STATEID:
4052         case -NFS4ERR_EXPIRED:
4053         case 0:
4054                 renew_lease(data->res.server, data->timestamp);
4055                 break;
4056         default:
4057                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4058                                 -EAGAIN) {
4059                         rpc_restart_call_prepare(task);
4060                         return;
4061                 }
4062         }
4063         data->rpc_status = task->tk_status;
4064 }
4065
4066 static void nfs4_delegreturn_release(void *calldata)
4067 {
4068         kfree(calldata);
4069 }
4070
4071 #if defined(CONFIG_NFS_V4_1)
4072 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4073 {
4074         struct nfs4_delegreturndata *d_data;
4075
4076         d_data = (struct nfs4_delegreturndata *)data;
4077
4078         if (nfs4_setup_sequence(d_data->res.server,
4079                                 &d_data->args.seq_args,
4080                                 &d_data->res.seq_res, task))
4081                 return;
4082         rpc_call_start(task);
4083 }
4084 #endif /* CONFIG_NFS_V4_1 */
4085
4086 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4087 #if defined(CONFIG_NFS_V4_1)
4088         .rpc_call_prepare = nfs4_delegreturn_prepare,
4089 #endif /* CONFIG_NFS_V4_1 */
4090         .rpc_call_done = nfs4_delegreturn_done,
4091         .rpc_release = nfs4_delegreturn_release,
4092 };
4093
4094 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4095 {
4096         struct nfs4_delegreturndata *data;
4097         struct nfs_server *server = NFS_SERVER(inode);
4098         struct rpc_task *task;
4099         struct rpc_message msg = {
4100                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4101                 .rpc_cred = cred,
4102         };
4103         struct rpc_task_setup task_setup_data = {
4104                 .rpc_client = server->client,
4105                 .rpc_message = &msg,
4106                 .callback_ops = &nfs4_delegreturn_ops,
4107                 .flags = RPC_TASK_ASYNC,
4108         };
4109         int status = 0;
4110
4111         data = kzalloc(sizeof(*data), GFP_NOFS);
4112         if (data == NULL)
4113                 return -ENOMEM;
4114         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4115         data->args.fhandle = &data->fh;
4116         data->args.stateid = &data->stateid;
4117         data->args.bitmask = server->cache_consistency_bitmask;
4118         nfs_copy_fh(&data->fh, NFS_FH(inode));
4119         nfs4_stateid_copy(&data->stateid, stateid);
4120         data->res.fattr = &data->fattr;
4121         data->res.server = server;
4122         nfs_fattr_init(data->res.fattr);
4123         data->timestamp = jiffies;
4124         data->rpc_status = 0;
4125
4126         task_setup_data.callback_data = data;
4127         msg.rpc_argp = &data->args;
4128         msg.rpc_resp = &data->res;
4129         task = rpc_run_task(&task_setup_data);
4130         if (IS_ERR(task))
4131                 return PTR_ERR(task);
4132         if (!issync)
4133                 goto out;
4134         status = nfs4_wait_for_completion_rpc_task(task);
4135         if (status != 0)
4136                 goto out;
4137         status = data->rpc_status;
4138         if (status == 0)
4139                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4140         else
4141                 nfs_refresh_inode(inode, &data->fattr);
4142 out:
4143         rpc_put_task(task);
4144         return status;
4145 }
4146
4147 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4148 {
4149         struct nfs_server *server = NFS_SERVER(inode);
4150         struct nfs4_exception exception = { };
4151         int err;
4152         do {
4153                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4154                 switch (err) {
4155                         case -NFS4ERR_STALE_STATEID:
4156                         case -NFS4ERR_EXPIRED:
4157                         case 0:
4158                                 return 0;
4159                 }
4160                 err = nfs4_handle_exception(server, err, &exception);
4161         } while (exception.retry);
4162         return err;
4163 }
4164
4165 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4166 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4167
4168 /*
4169  * sleep, with exponential backoff, and retry the LOCK operation.
4170  */
4171 static unsigned long
4172 nfs4_set_lock_task_retry(unsigned long timeout)
4173 {
4174         freezable_schedule_timeout_killable(timeout);
4175         timeout <<= 1;
4176         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4177                 return NFS4_LOCK_MAXTIMEOUT;
4178         return timeout;
4179 }
4180
4181 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4182 {
4183         struct inode *inode = state->inode;
4184         struct nfs_server *server = NFS_SERVER(inode);
4185         struct nfs_client *clp = server->nfs_client;
4186         struct nfs_lockt_args arg = {
4187                 .fh = NFS_FH(inode),
4188                 .fl = request,
4189         };
4190         struct nfs_lockt_res res = {
4191                 .denied = request,
4192         };
4193         struct rpc_message msg = {
4194                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4195                 .rpc_argp       = &arg,
4196                 .rpc_resp       = &res,
4197                 .rpc_cred       = state->owner->so_cred,
4198         };
4199         struct nfs4_lock_state *lsp;
4200         int status;
4201
4202         arg.lock_owner.clientid = clp->cl_clientid;
4203         status = nfs4_set_lock_state(state, request);
4204         if (status != 0)
4205                 goto out;
4206         lsp = request->fl_u.nfs4_fl.owner;
4207         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4208         arg.lock_owner.s_dev = server->s_dev;
4209         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4210         switch (status) {
4211                 case 0:
4212                         request->fl_type = F_UNLCK;
4213                         break;
4214                 case -NFS4ERR_DENIED:
4215                         status = 0;
4216         }
4217         request->fl_ops->fl_release_private(request);
4218 out:
4219         return status;
4220 }
4221
4222 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4223 {
4224         struct nfs4_exception exception = { };
4225         int err;
4226
4227         do {
4228                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4229                                 _nfs4_proc_getlk(state, cmd, request),
4230                                 &exception);
4231         } while (exception.retry);
4232         return err;
4233 }
4234
4235 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4236 {
4237         int res = 0;
4238         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4239                 case FL_POSIX:
4240                         res = posix_lock_file_wait(file, fl);
4241                         break;
4242                 case FL_FLOCK:
4243                         res = flock_lock_file_wait(file, fl);
4244                         break;
4245                 default:
4246                         BUG();
4247         }
4248         return res;
4249 }
4250
4251 struct nfs4_unlockdata {
4252         struct nfs_locku_args arg;
4253         struct nfs_locku_res res;
4254         struct nfs4_lock_state *lsp;
4255         struct nfs_open_context *ctx;
4256         struct file_lock fl;
4257         const struct nfs_server *server;
4258         unsigned long timestamp;
4259 };
4260
4261 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4262                 struct nfs_open_context *ctx,
4263                 struct nfs4_lock_state *lsp,
4264                 struct nfs_seqid *seqid)
4265 {
4266         struct nfs4_unlockdata *p;
4267         struct inode *inode = lsp->ls_state->inode;
4268
4269         p = kzalloc(sizeof(*p), GFP_NOFS);
4270         if (p == NULL)
4271                 return NULL;
4272         p->arg.fh = NFS_FH(inode);
4273         p->arg.fl = &p->fl;
4274         p->arg.seqid = seqid;
4275         p->res.seqid = seqid;
4276         p->arg.stateid = &lsp->ls_stateid;
4277         p->lsp = lsp;
4278         atomic_inc(&lsp->ls_count);
4279         /* Ensure we don't close file until we're done freeing locks! */
4280         p->ctx = get_nfs_open_context(ctx);
4281         memcpy(&p->fl, fl, sizeof(p->fl));
4282         p->server = NFS_SERVER(inode);
4283         return p;
4284 }
4285
4286 static void nfs4_locku_release_calldata(void *data)
4287 {
4288         struct nfs4_unlockdata *calldata = data;
4289         nfs_free_seqid(calldata->arg.seqid);
4290         nfs4_put_lock_state(calldata->lsp);
4291         put_nfs_open_context(calldata->ctx);
4292         kfree(calldata);
4293 }
4294
4295 static void nfs4_locku_done(struct rpc_task *task, void *data)
4296 {
4297         struct nfs4_unlockdata *calldata = data;
4298
4299         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4300                 return;
4301         switch (task->tk_status) {
4302                 case 0:
4303                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4304                                         &calldata->res.stateid);
4305                         renew_lease(calldata->server, calldata->timestamp);
4306                         break;
4307                 case -NFS4ERR_BAD_STATEID:
4308                 case -NFS4ERR_OLD_STATEID:
4309                 case -NFS4ERR_STALE_STATEID:
4310                 case -NFS4ERR_EXPIRED:
4311                         break;
4312                 default:
4313                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4314                                 rpc_restart_call_prepare(task);
4315         }
4316 }
4317
4318 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4319 {
4320         struct nfs4_unlockdata *calldata = data;
4321
4322         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4323                 return;
4324         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4325                 /* Note: exit _without_ running nfs4_locku_done */
4326                 task->tk_action = NULL;
4327                 return;
4328         }
4329         calldata->timestamp = jiffies;
4330         if (nfs4_setup_sequence(calldata->server,
4331                                 &calldata->arg.seq_args,
4332                                 &calldata->res.seq_res, task))
4333                 return;
4334         rpc_call_start(task);
4335 }
4336
4337 static const struct rpc_call_ops nfs4_locku_ops = {
4338         .rpc_call_prepare = nfs4_locku_prepare,
4339         .rpc_call_done = nfs4_locku_done,
4340         .rpc_release = nfs4_locku_release_calldata,
4341 };
4342
4343 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4344                 struct nfs_open_context *ctx,
4345                 struct nfs4_lock_state *lsp,
4346                 struct nfs_seqid *seqid)
4347 {
4348         struct nfs4_unlockdata *data;
4349         struct rpc_message msg = {
4350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4351                 .rpc_cred = ctx->cred,
4352         };
4353         struct rpc_task_setup task_setup_data = {
4354                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4355                 .rpc_message = &msg,
4356                 .callback_ops = &nfs4_locku_ops,
4357                 .workqueue = nfsiod_workqueue,
4358                 .flags = RPC_TASK_ASYNC,
4359         };
4360
4361         /* Ensure this is an unlock - when canceling a lock, the
4362          * canceled lock is passed in, and it won't be an unlock.
4363          */
4364         fl->fl_type = F_UNLCK;
4365
4366         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4367         if (data == NULL) {
4368                 nfs_free_seqid(seqid);
4369                 return ERR_PTR(-ENOMEM);
4370         }
4371
4372         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4373         msg.rpc_argp = &data->arg;
4374         msg.rpc_resp = &data->res;
4375         task_setup_data.callback_data = data;
4376         return rpc_run_task(&task_setup_data);
4377 }
4378
4379 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4380 {
4381         struct nfs_inode *nfsi = NFS_I(state->inode);
4382         struct nfs_seqid *seqid;
4383         struct nfs4_lock_state *lsp;
4384         struct rpc_task *task;
4385         int status = 0;
4386         unsigned char fl_flags = request->fl_flags;
4387
4388         status = nfs4_set_lock_state(state, request);
4389         /* Unlock _before_ we do the RPC call */
4390         request->fl_flags |= FL_EXISTS;
4391         down_read(&nfsi->rwsem);
4392         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4393                 up_read(&nfsi->rwsem);
4394                 goto out;
4395         }
4396         up_read(&nfsi->rwsem);
4397         if (status != 0)
4398                 goto out;
4399         /* Is this a delegated lock? */
4400         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4401                 goto out;
4402         lsp = request->fl_u.nfs4_fl.owner;
4403         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4404         status = -ENOMEM;
4405         if (seqid == NULL)
4406                 goto out;
4407         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4408         status = PTR_ERR(task);
4409         if (IS_ERR(task))
4410                 goto out;
4411         status = nfs4_wait_for_completion_rpc_task(task);
4412         rpc_put_task(task);
4413 out:
4414         request->fl_flags = fl_flags;
4415         return status;
4416 }
4417
4418 struct nfs4_lockdata {
4419         struct nfs_lock_args arg;
4420         struct nfs_lock_res res;
4421         struct nfs4_lock_state *lsp;
4422         struct nfs_open_context *ctx;
4423         struct file_lock fl;
4424         unsigned long timestamp;
4425         int rpc_status;
4426         int cancelled;
4427         struct nfs_server *server;
4428 };
4429
4430 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4431                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4432                 gfp_t gfp_mask)
4433 {
4434         struct nfs4_lockdata *p;
4435         struct inode *inode = lsp->ls_state->inode;
4436         struct nfs_server *server = NFS_SERVER(inode);
4437
4438         p = kzalloc(sizeof(*p), gfp_mask);
4439         if (p == NULL)
4440                 return NULL;
4441
4442         p->arg.fh = NFS_FH(inode);
4443         p->arg.fl = &p->fl;
4444         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4445         if (p->arg.open_seqid == NULL)
4446                 goto out_free;
4447         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4448         if (p->arg.lock_seqid == NULL)
4449                 goto out_free_seqid;
4450         p->arg.lock_stateid = &lsp->ls_stateid;
4451         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4452         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4453         p->arg.lock_owner.s_dev = server->s_dev;
4454         p->res.lock_seqid = p->arg.lock_seqid;
4455         p->lsp = lsp;
4456         p->server = server;
4457         atomic_inc(&lsp->ls_count);
4458         p->ctx = get_nfs_open_context(ctx);
4459         memcpy(&p->fl, fl, sizeof(p->fl));
4460         return p;
4461 out_free_seqid:
4462         nfs_free_seqid(p->arg.open_seqid);
4463 out_free:
4464         kfree(p);
4465         return NULL;
4466 }
4467
4468 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4469 {
4470         struct nfs4_lockdata *data = calldata;
4471         struct nfs4_state *state = data->lsp->ls_state;
4472
4473         dprintk("%s: begin!\n", __func__);
4474         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4475                 return;
4476         /* Do we need to do an open_to_lock_owner? */
4477         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4478                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4479                         return;
4480                 data->arg.open_stateid = &state->stateid;
4481                 data->arg.new_lock_owner = 1;
4482                 data->res.open_seqid = data->arg.open_seqid;
4483         } else
4484                 data->arg.new_lock_owner = 0;
4485         data->timestamp = jiffies;
4486         if (nfs4_setup_sequence(data->server,
4487                                 &data->arg.seq_args,
4488                                 &data->res.seq_res, task))
4489                 return;
4490         rpc_call_start(task);
4491         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4492 }
4493
4494 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4495 {
4496         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4497         nfs4_lock_prepare(task, calldata);
4498 }
4499
4500 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4501 {
4502         struct nfs4_lockdata *data = calldata;
4503
4504         dprintk("%s: begin!\n", __func__);
4505
4506         if (!nfs4_sequence_done(task, &data->res.seq_res))
4507                 return;
4508
4509         data->rpc_status = task->tk_status;
4510         if (data->arg.new_lock_owner != 0) {
4511                 if (data->rpc_status == 0)
4512                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4513                 else
4514                         goto out;
4515         }
4516         if (data->rpc_status == 0) {
4517                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4518                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4519                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4520         }
4521 out:
4522         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4523 }
4524
4525 static void nfs4_lock_release(void *calldata)
4526 {
4527         struct nfs4_lockdata *data = calldata;
4528
4529         dprintk("%s: begin!\n", __func__);
4530         nfs_free_seqid(data->arg.open_seqid);
4531         if (data->cancelled != 0) {
4532                 struct rpc_task *task;
4533                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4534                                 data->arg.lock_seqid);
4535                 if (!IS_ERR(task))
4536                         rpc_put_task_async(task);
4537                 dprintk("%s: cancelling lock!\n", __func__);
4538         } else
4539                 nfs_free_seqid(data->arg.lock_seqid);
4540         nfs4_put_lock_state(data->lsp);
4541         put_nfs_open_context(data->ctx);
4542         kfree(data);
4543         dprintk("%s: done!\n", __func__);
4544 }
4545
4546 static const struct rpc_call_ops nfs4_lock_ops = {
4547         .rpc_call_prepare = nfs4_lock_prepare,
4548         .rpc_call_done = nfs4_lock_done,
4549         .rpc_release = nfs4_lock_release,
4550 };
4551
4552 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4553         .rpc_call_prepare = nfs4_recover_lock_prepare,
4554         .rpc_call_done = nfs4_lock_done,
4555         .rpc_release = nfs4_lock_release,
4556 };
4557
4558 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4559 {
4560         switch (error) {
4561         case -NFS4ERR_ADMIN_REVOKED:
4562         case -NFS4ERR_BAD_STATEID:
4563                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4564                 if (new_lock_owner != 0 ||
4565                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4566                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4567                 break;
4568         case -NFS4ERR_STALE_STATEID:
4569                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4570         case -NFS4ERR_EXPIRED:
4571                 nfs4_schedule_lease_recovery(server->nfs_client);
4572         };
4573 }
4574
4575 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4576 {
4577         struct nfs4_lockdata *data;
4578         struct rpc_task *task;
4579         struct rpc_message msg = {
4580                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4581                 .rpc_cred = state->owner->so_cred,
4582         };
4583         struct rpc_task_setup task_setup_data = {
4584                 .rpc_client = NFS_CLIENT(state->inode),
4585                 .rpc_message = &msg,
4586                 .callback_ops = &nfs4_lock_ops,
4587                 .workqueue = nfsiod_workqueue,
4588                 .flags = RPC_TASK_ASYNC,
4589         };
4590         int ret;
4591
4592         dprintk("%s: begin!\n", __func__);
4593         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4594                         fl->fl_u.nfs4_fl.owner,
4595                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4596         if (data == NULL)
4597                 return -ENOMEM;
4598         if (IS_SETLKW(cmd))
4599                 data->arg.block = 1;
4600         if (recovery_type > NFS_LOCK_NEW) {
4601                 if (recovery_type == NFS_LOCK_RECLAIM)
4602                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4603                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4604         }
4605         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4606         msg.rpc_argp = &data->arg;
4607         msg.rpc_resp = &data->res;
4608         task_setup_data.callback_data = data;
4609         task = rpc_run_task(&task_setup_data);
4610         if (IS_ERR(task))
4611                 return PTR_ERR(task);
4612         ret = nfs4_wait_for_completion_rpc_task(task);
4613         if (ret == 0) {
4614                 ret = data->rpc_status;
4615                 if (ret)
4616                         nfs4_handle_setlk_error(data->server, data->lsp,
4617                                         data->arg.new_lock_owner, ret);
4618         } else
4619                 data->cancelled = 1;
4620         rpc_put_task(task);
4621         dprintk("%s: done, ret = %d!\n", __func__, ret);
4622         return ret;
4623 }
4624
4625 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4626 {
4627         struct nfs_server *server = NFS_SERVER(state->inode);
4628         struct nfs4_exception exception = {
4629                 .inode = state->inode,
4630         };
4631         int err;
4632
4633         do {
4634                 /* Cache the lock if possible... */
4635                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4636                         return 0;
4637                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4638                 if (err != -NFS4ERR_DELAY)
4639                         break;
4640                 nfs4_handle_exception(server, err, &exception);
4641         } while (exception.retry);
4642         return err;
4643 }
4644
4645 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4646 {
4647         struct nfs_server *server = NFS_SERVER(state->inode);
4648         struct nfs4_exception exception = {
4649                 .inode = state->inode,
4650         };
4651         int err;
4652
4653         err = nfs4_set_lock_state(state, request);
4654         if (err != 0)
4655                 return err;
4656         do {
4657                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4658                         return 0;
4659                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4660                 switch (err) {
4661                 default:
4662                         goto out;
4663                 case -NFS4ERR_GRACE:
4664                 case -NFS4ERR_DELAY:
4665                         nfs4_handle_exception(server, err, &exception);
4666                         err = 0;
4667                 }
4668         } while (exception.retry);
4669 out:
4670         return err;
4671 }
4672
4673 #if defined(CONFIG_NFS_V4_1)
4674 static int nfs41_check_expired_locks(struct nfs4_state *state)
4675 {
4676         int status, ret = NFS_OK;
4677         struct nfs4_lock_state *lsp;
4678         struct nfs_server *server = NFS_SERVER(state->inode);
4679
4680         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4681                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4682                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4683                         if (status != NFS_OK) {
4684                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4685                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4686                                 ret = status;
4687                         }
4688                 }
4689         };
4690
4691         return ret;
4692 }
4693
4694 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4695 {
4696         int status = NFS_OK;
4697
4698         if (test_bit(LK_STATE_IN_USE, &state->flags))
4699                 status = nfs41_check_expired_locks(state);
4700         if (status == NFS_OK)
4701                 return status;
4702         return nfs4_lock_expired(state, request);
4703 }
4704 #endif
4705
4706 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4707 {
4708         struct nfs_inode *nfsi = NFS_I(state->inode);
4709         unsigned char fl_flags = request->fl_flags;
4710         int status = -ENOLCK;
4711
4712         if ((fl_flags & FL_POSIX) &&
4713                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4714                 goto out;
4715         /* Is this a delegated open? */
4716         status = nfs4_set_lock_state(state, request);
4717         if (status != 0)
4718                 goto out;
4719         request->fl_flags |= FL_ACCESS;
4720         status = do_vfs_lock(request->fl_file, request);
4721         if (status < 0)
4722                 goto out;
4723         down_read(&nfsi->rwsem);
4724         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4725                 /* Yes: cache locks! */
4726                 /* ...but avoid races with delegation recall... */
4727                 request->fl_flags = fl_flags & ~FL_SLEEP;
4728                 status = do_vfs_lock(request->fl_file, request);
4729                 goto out_unlock;
4730         }
4731         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4732         if (status != 0)
4733                 goto out_unlock;
4734         /* Note: we always want to sleep here! */
4735         request->fl_flags = fl_flags | FL_SLEEP;
4736         if (do_vfs_lock(request->fl_file, request) < 0)
4737                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4738                         "manager!\n", __func__);
4739 out_unlock:
4740         up_read(&nfsi->rwsem);
4741 out:
4742         request->fl_flags = fl_flags;
4743         return status;
4744 }
4745
4746 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4747 {
4748         struct nfs4_exception exception = {
4749                 .state = state,
4750                 .inode = state->inode,
4751         };
4752         int err;
4753
4754         do {
4755                 err = _nfs4_proc_setlk(state, cmd, request);
4756                 if (err == -NFS4ERR_DENIED)
4757                         err = -EAGAIN;
4758                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4759                                 err, &exception);
4760         } while (exception.retry);
4761         return err;
4762 }
4763
4764 static int
4765 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4766 {
4767         struct nfs_open_context *ctx;
4768         struct nfs4_state *state;
4769         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4770         int status;
4771
4772         /* verify open state */
4773         ctx = nfs_file_open_context(filp);
4774         state = ctx->state;
4775
4776         if (request->fl_start < 0 || request->fl_end < 0)
4777                 return -EINVAL;
4778
4779         if (IS_GETLK(cmd)) {
4780                 if (state != NULL)
4781                         return nfs4_proc_getlk(state, F_GETLK, request);
4782                 return 0;
4783         }
4784
4785         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4786                 return -EINVAL;
4787
4788         if (request->fl_type == F_UNLCK) {
4789                 if (state != NULL)
4790                         return nfs4_proc_unlck(state, cmd, request);
4791                 return 0;
4792         }
4793
4794         if (state == NULL)
4795                 return -ENOLCK;
4796         /*
4797          * Don't rely on the VFS having checked the file open mode,
4798          * since it won't do this for flock() locks.
4799          */
4800         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4801         case F_RDLCK:
4802                 if (!(filp->f_mode & FMODE_READ))
4803                         return -EBADF;
4804                 break;
4805         case F_WRLCK:
4806                 if (!(filp->f_mode & FMODE_WRITE))
4807                         return -EBADF;
4808         }
4809
4810         do {
4811                 status = nfs4_proc_setlk(state, cmd, request);
4812                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4813                         break;
4814                 timeout = nfs4_set_lock_task_retry(timeout);
4815                 status = -ERESTARTSYS;
4816                 if (signalled())
4817                         break;
4818         } while(status < 0);
4819         return status;
4820 }
4821
4822 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4823 {
4824         struct nfs_server *server = NFS_SERVER(state->inode);
4825         struct nfs4_exception exception = { };
4826         int err;
4827
4828         err = nfs4_set_lock_state(state, fl);
4829         if (err != 0)
4830                 goto out;
4831         do {
4832                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4833                 switch (err) {
4834                         default:
4835                                 printk(KERN_ERR "NFS: %s: unhandled error "
4836                                         "%d.\n", __func__, err);
4837                         case 0:
4838                         case -ESTALE:
4839                                 goto out;
4840                         case -NFS4ERR_EXPIRED:
4841                                 nfs4_schedule_stateid_recovery(server, state);
4842                         case -NFS4ERR_STALE_CLIENTID:
4843                         case -NFS4ERR_STALE_STATEID:
4844                                 nfs4_schedule_lease_recovery(server->nfs_client);
4845                                 goto out;
4846                         case -NFS4ERR_BADSESSION:
4847                         case -NFS4ERR_BADSLOT:
4848                         case -NFS4ERR_BAD_HIGH_SLOT:
4849                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4850                         case -NFS4ERR_DEADSESSION:
4851                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4852                                 goto out;
4853                         case -ERESTARTSYS:
4854                                 /*
4855                                  * The show must go on: exit, but mark the
4856                                  * stateid as needing recovery.
4857                                  */
4858                         case -NFS4ERR_DELEG_REVOKED:
4859                         case -NFS4ERR_ADMIN_REVOKED:
4860                         case -NFS4ERR_BAD_STATEID:
4861                         case -NFS4ERR_OPENMODE:
4862                                 nfs4_schedule_stateid_recovery(server, state);
4863                                 err = 0;
4864                                 goto out;
4865                         case -EKEYEXPIRED:
4866                                 /*
4867                                  * User RPCSEC_GSS context has expired.
4868                                  * We cannot recover this stateid now, so
4869                                  * skip it and allow recovery thread to
4870                                  * proceed.
4871                                  */
4872                                 err = 0;
4873                                 goto out;
4874                         case -ENOMEM:
4875                         case -NFS4ERR_DENIED:
4876                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4877                                 err = 0;
4878                                 goto out;
4879                         case -NFS4ERR_DELAY:
4880                                 break;
4881                 }
4882                 err = nfs4_handle_exception(server, err, &exception);
4883         } while (exception.retry);
4884 out:
4885         return err;
4886 }
4887
4888 struct nfs_release_lockowner_data {
4889         struct nfs4_lock_state *lsp;
4890         struct nfs_server *server;
4891         struct nfs_release_lockowner_args args;
4892 };
4893
4894 static void nfs4_release_lockowner_release(void *calldata)
4895 {
4896         struct nfs_release_lockowner_data *data = calldata;
4897         nfs4_free_lock_state(data->server, data->lsp);
4898         kfree(calldata);
4899 }
4900
4901 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4902         .rpc_release = nfs4_release_lockowner_release,
4903 };
4904
4905 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4906 {
4907         struct nfs_server *server = lsp->ls_state->owner->so_server;
4908         struct nfs_release_lockowner_data *data;
4909         struct rpc_message msg = {
4910                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4911         };
4912
4913         if (server->nfs_client->cl_mvops->minor_version != 0)
4914                 return -EINVAL;
4915         data = kmalloc(sizeof(*data), GFP_NOFS);
4916         if (!data)
4917                 return -ENOMEM;
4918         data->lsp = lsp;
4919         data->server = server;
4920         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4921         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4922         data->args.lock_owner.s_dev = server->s_dev;
4923         msg.rpc_argp = &data->args;
4924         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4925         return 0;
4926 }
4927
4928 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4929
4930 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4931                                    const void *buf, size_t buflen,
4932                                    int flags, int type)
4933 {
4934         if (strcmp(key, "") != 0)
4935                 return -EINVAL;
4936
4937         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4938 }
4939
4940 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4941                                    void *buf, size_t buflen, int type)
4942 {
4943         if (strcmp(key, "") != 0)
4944                 return -EINVAL;
4945
4946         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4947 }
4948
4949 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4950                                        size_t list_len, const char *name,
4951                                        size_t name_len, int type)
4952 {
4953         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4954
4955         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4956                 return 0;
4957
4958         if (list && len <= list_len)
4959                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4960         return len;
4961 }
4962
4963 /*
4964  * nfs_fhget will use either the mounted_on_fileid or the fileid
4965  */
4966 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4967 {
4968         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4969                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4970               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4971               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4972                 return;
4973
4974         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4975                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4976         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4977         fattr->nlink = 2;
4978 }
4979
4980 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4981                                    const struct qstr *name,
4982                                    struct nfs4_fs_locations *fs_locations,
4983                                    struct page *page)
4984 {
4985         struct nfs_server *server = NFS_SERVER(dir);
4986         u32 bitmask[2] = {
4987                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4988         };
4989         struct nfs4_fs_locations_arg args = {
4990                 .dir_fh = NFS_FH(dir),
4991                 .name = name,
4992                 .page = page,
4993                 .bitmask = bitmask,
4994         };
4995         struct nfs4_fs_locations_res res = {
4996                 .fs_locations = fs_locations,
4997         };
4998         struct rpc_message msg = {
4999                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5000                 .rpc_argp = &args,
5001                 .rpc_resp = &res,
5002         };
5003         int status;
5004
5005         dprintk("%s: start\n", __func__);
5006
5007         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5008          * is not supported */
5009         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5010                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5011         else
5012                 bitmask[0] |= FATTR4_WORD0_FILEID;
5013
5014         nfs_fattr_init(&fs_locations->fattr);
5015         fs_locations->server = server;
5016         fs_locations->nlocations = 0;
5017         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5018         dprintk("%s: returned status = %d\n", __func__, status);
5019         return status;
5020 }
5021
5022 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5023                            const struct qstr *name,
5024                            struct nfs4_fs_locations *fs_locations,
5025                            struct page *page)
5026 {
5027         struct nfs4_exception exception = { };
5028         int err;
5029         do {
5030                 err = nfs4_handle_exception(NFS_SERVER(dir),
5031                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5032                                 &exception);
5033         } while (exception.retry);
5034         return err;
5035 }
5036
5037 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5038 {
5039         int status;
5040         struct nfs4_secinfo_arg args = {
5041                 .dir_fh = NFS_FH(dir),
5042                 .name   = name,
5043         };
5044         struct nfs4_secinfo_res res = {
5045                 .flavors     = flavors,
5046         };
5047         struct rpc_message msg = {
5048                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5049                 .rpc_argp = &args,
5050                 .rpc_resp = &res,
5051         };
5052
5053         dprintk("NFS call  secinfo %s\n", name->name);
5054         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5055         dprintk("NFS reply  secinfo: %d\n", status);
5056         return status;
5057 }
5058
5059 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5060                       struct nfs4_secinfo_flavors *flavors)
5061 {
5062         struct nfs4_exception exception = { };
5063         int err;
5064         do {
5065                 err = nfs4_handle_exception(NFS_SERVER(dir),
5066                                 _nfs4_proc_secinfo(dir, name, flavors),
5067                                 &exception);
5068         } while (exception.retry);
5069         return err;
5070 }
5071
5072 #ifdef CONFIG_NFS_V4_1
5073 /*
5074  * Check the exchange flags returned by the server for invalid flags, having
5075  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5076  * DS flags set.
5077  */
5078 static int nfs4_check_cl_exchange_flags(u32 flags)
5079 {
5080         if (flags & ~EXCHGID4_FLAG_MASK_R)
5081                 goto out_inval;
5082         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5083             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5084                 goto out_inval;
5085         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5086                 goto out_inval;
5087         return NFS_OK;
5088 out_inval:
5089         return -NFS4ERR_INVAL;
5090 }
5091
5092 static bool
5093 nfs41_same_server_scope(struct nfs41_server_scope *a,
5094                         struct nfs41_server_scope *b)
5095 {
5096         if (a->server_scope_sz == b->server_scope_sz &&
5097             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5098                 return true;
5099
5100         return false;
5101 }
5102
5103 /*
5104  * nfs4_proc_bind_conn_to_session()
5105  *
5106  * The 4.1 client currently uses the same TCP connection for the
5107  * fore and backchannel.
5108  */
5109 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5110 {
5111         int status;
5112         struct nfs41_bind_conn_to_session_res res;
5113         struct rpc_message msg = {
5114                 .rpc_proc =
5115                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5116                 .rpc_argp = clp,
5117                 .rpc_resp = &res,
5118                 .rpc_cred = cred,
5119         };
5120
5121         dprintk("--> %s\n", __func__);
5122         BUG_ON(clp == NULL);
5123
5124         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5125         if (unlikely(res.session == NULL)) {
5126                 status = -ENOMEM;
5127                 goto out;
5128         }
5129
5130         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5131         if (status == 0) {
5132                 if (memcmp(res.session->sess_id.data,
5133                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5134                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5135                         status = -EIO;
5136                         goto out_session;
5137                 }
5138                 if (res.dir != NFS4_CDFS4_BOTH) {
5139                         dprintk("NFS: %s: Unexpected direction from server\n",
5140                                 __func__);
5141                         status = -EIO;
5142                         goto out_session;
5143                 }
5144                 if (res.use_conn_in_rdma_mode) {
5145                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5146                                 __func__);
5147                         status = -EIO;
5148                         goto out_session;
5149                 }
5150         }
5151 out_session:
5152         kfree(res.session);
5153 out:
5154         dprintk("<-- %s status= %d\n", __func__, status);
5155         return status;
5156 }
5157
5158 /*
5159  * nfs4_proc_exchange_id()
5160  *
5161  * Since the clientid has expired, all compounds using sessions
5162  * associated with the stale clientid will be returning
5163  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5164  * be in some phase of session reset.
5165  */
5166 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5167 {
5168         nfs4_verifier verifier;
5169         struct nfs41_exchange_id_args args = {
5170                 .verifier = &verifier,
5171                 .client = clp,
5172                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5173         };
5174         struct nfs41_exchange_id_res res = {
5175                 0
5176         };
5177         int status;
5178         struct rpc_message msg = {
5179                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5180                 .rpc_argp = &args,
5181                 .rpc_resp = &res,
5182                 .rpc_cred = cred,
5183         };
5184
5185         dprintk("--> %s\n", __func__);
5186         BUG_ON(clp == NULL);
5187
5188         nfs4_init_boot_verifier(clp, &verifier);
5189
5190         args.id_len = scnprintf(args.id, sizeof(args.id),
5191                                 "%s/%s/%u",
5192                                 clp->cl_ipaddr,
5193                                 clp->cl_rpcclient->cl_nodename,
5194                                 clp->cl_rpcclient->cl_auth->au_flavor);
5195
5196         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5197                                         GFP_NOFS);
5198         if (unlikely(res.server_owner == NULL)) {
5199                 status = -ENOMEM;
5200                 goto out;
5201         }
5202
5203         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5204                                         GFP_NOFS);
5205         if (unlikely(res.server_scope == NULL)) {
5206                 status = -ENOMEM;
5207                 goto out_server_owner;
5208         }
5209
5210         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5211         if (unlikely(res.impl_id == NULL)) {
5212                 status = -ENOMEM;
5213                 goto out_server_scope;
5214         }
5215
5216         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5217         if (status == 0)
5218                 status = nfs4_check_cl_exchange_flags(res.flags);
5219
5220         if (status == 0) {
5221                 clp->cl_clientid = res.clientid;
5222                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5223                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5224                         clp->cl_seqid = res.seqid;
5225
5226                 kfree(clp->cl_serverowner);
5227                 clp->cl_serverowner = res.server_owner;
5228                 res.server_owner = NULL;
5229
5230                 /* use the most recent implementation id */
5231                 kfree(clp->cl_implid);
5232                 clp->cl_implid = res.impl_id;
5233
5234                 if (clp->cl_serverscope != NULL &&
5235                     !nfs41_same_server_scope(clp->cl_serverscope,
5236                                              res.server_scope)) {
5237                         dprintk("%s: server_scope mismatch detected\n",
5238                                 __func__);
5239                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5240                         kfree(clp->cl_serverscope);
5241                         clp->cl_serverscope = NULL;
5242                 }
5243
5244                 if (clp->cl_serverscope == NULL) {
5245                         clp->cl_serverscope = res.server_scope;
5246                         goto out;
5247                 }
5248         } else
5249                 kfree(res.impl_id);
5250
5251 out_server_owner:
5252         kfree(res.server_owner);
5253 out_server_scope:
5254         kfree(res.server_scope);
5255 out:
5256         if (clp->cl_implid != NULL)
5257                 dprintk("%s: Server Implementation ID: "
5258                         "domain: %s, name: %s, date: %llu,%u\n",
5259                         __func__, clp->cl_implid->domain, clp->cl_implid->name,
5260                         clp->cl_implid->date.seconds,
5261                         clp->cl_implid->date.nseconds);
5262         dprintk("<-- %s status= %d\n", __func__, status);
5263         return status;
5264 }
5265
5266 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5267                 struct rpc_cred *cred)
5268 {
5269         struct rpc_message msg = {
5270                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5271                 .rpc_argp = clp,
5272                 .rpc_cred = cred,
5273         };
5274         int status;
5275
5276         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5277         if (status)
5278                 pr_warn("NFS: Got error %d from the server %s on "
5279                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5280         return status;
5281 }
5282
5283 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5284                 struct rpc_cred *cred)
5285 {
5286         unsigned int loop;
5287         int ret;
5288
5289         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5290                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5291                 switch (ret) {
5292                 case -NFS4ERR_DELAY:
5293                 case -NFS4ERR_CLIENTID_BUSY:
5294                         ssleep(1);
5295                         break;
5296                 default:
5297                         return ret;
5298                 }
5299         }
5300         return 0;
5301 }
5302
5303 int nfs4_destroy_clientid(struct nfs_client *clp)
5304 {
5305         struct rpc_cred *cred;
5306         int ret = 0;
5307
5308         if (clp->cl_mvops->minor_version < 1)
5309                 goto out;
5310         if (clp->cl_exchange_flags == 0)
5311                 goto out;
5312         cred = nfs4_get_exchange_id_cred(clp);
5313         ret = nfs4_proc_destroy_clientid(clp, cred);
5314         if (cred)
5315                 put_rpccred(cred);
5316         switch (ret) {
5317         case 0:
5318         case -NFS4ERR_STALE_CLIENTID:
5319                 clp->cl_exchange_flags = 0;
5320         }
5321 out:
5322         return ret;
5323 }
5324
5325 struct nfs4_get_lease_time_data {
5326         struct nfs4_get_lease_time_args *args;
5327         struct nfs4_get_lease_time_res *res;
5328         struct nfs_client *clp;
5329 };
5330
5331 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5332                                         void *calldata)
5333 {
5334         int ret;
5335         struct nfs4_get_lease_time_data *data =
5336                         (struct nfs4_get_lease_time_data *)calldata;
5337
5338         dprintk("--> %s\n", __func__);
5339         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5340         /* just setup sequence, do not trigger session recovery
5341            since we're invoked within one */
5342         ret = nfs41_setup_sequence(data->clp->cl_session,
5343                                    &data->args->la_seq_args,
5344                                    &data->res->lr_seq_res, task);
5345
5346         BUG_ON(ret == -EAGAIN);
5347         rpc_call_start(task);
5348         dprintk("<-- %s\n", __func__);
5349 }
5350
5351 /*
5352  * Called from nfs4_state_manager thread for session setup, so don't recover
5353  * from sequence operation or clientid errors.
5354  */
5355 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5356 {
5357         struct nfs4_get_lease_time_data *data =
5358                         (struct nfs4_get_lease_time_data *)calldata;
5359
5360         dprintk("--> %s\n", __func__);
5361         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5362                 return;
5363         switch (task->tk_status) {
5364         case -NFS4ERR_DELAY:
5365         case -NFS4ERR_GRACE:
5366                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5367                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5368                 task->tk_status = 0;
5369                 /* fall through */
5370         case -NFS4ERR_RETRY_UNCACHED_REP:
5371                 rpc_restart_call_prepare(task);
5372                 return;
5373         }
5374         dprintk("<-- %s\n", __func__);
5375 }
5376
5377 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5378         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5379         .rpc_call_done = nfs4_get_lease_time_done,
5380 };
5381
5382 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5383 {
5384         struct rpc_task *task;
5385         struct nfs4_get_lease_time_args args;
5386         struct nfs4_get_lease_time_res res = {
5387                 .lr_fsinfo = fsinfo,
5388         };
5389         struct nfs4_get_lease_time_data data = {
5390                 .args = &args,
5391                 .res = &res,
5392                 .clp = clp,
5393         };
5394         struct rpc_message msg = {
5395                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5396                 .rpc_argp = &args,
5397                 .rpc_resp = &res,
5398         };
5399         struct rpc_task_setup task_setup = {
5400                 .rpc_client = clp->cl_rpcclient,
5401                 .rpc_message = &msg,
5402                 .callback_ops = &nfs4_get_lease_time_ops,
5403                 .callback_data = &data,
5404                 .flags = RPC_TASK_TIMEOUT,
5405         };
5406         int status;
5407
5408         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5409         dprintk("--> %s\n", __func__);
5410         task = rpc_run_task(&task_setup);
5411
5412         if (IS_ERR(task))
5413                 status = PTR_ERR(task);
5414         else {
5415                 status = task->tk_status;
5416                 rpc_put_task(task);
5417         }
5418         dprintk("<-- %s return %d\n", __func__, status);
5419
5420         return status;
5421 }
5422
5423 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5424 {
5425         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5426 }
5427
5428 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5429                 struct nfs4_slot *new,
5430                 u32 max_slots,
5431                 u32 ivalue)
5432 {
5433         struct nfs4_slot *old = NULL;
5434         u32 i;
5435
5436         spin_lock(&tbl->slot_tbl_lock);
5437         if (new) {
5438                 old = tbl->slots;
5439                 tbl->slots = new;
5440                 tbl->max_slots = max_slots;
5441         }
5442         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5443         for (i = 0; i < tbl->max_slots; i++)
5444                 tbl->slots[i].seq_nr = ivalue;
5445         spin_unlock(&tbl->slot_tbl_lock);
5446         kfree(old);
5447 }
5448
5449 /*
5450  * (re)Initialise a slot table
5451  */
5452 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5453                                  u32 ivalue)
5454 {
5455         struct nfs4_slot *new = NULL;
5456         int ret = -ENOMEM;
5457
5458         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5459                 max_reqs, tbl->max_slots);
5460
5461         /* Does the newly negotiated max_reqs match the existing slot table? */
5462         if (max_reqs != tbl->max_slots) {
5463                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5464                 if (!new)
5465                         goto out;
5466         }
5467         ret = 0;
5468
5469         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5470         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5471                 tbl, tbl->slots, tbl->max_slots);
5472 out:
5473         dprintk("<-- %s: return %d\n", __func__, ret);
5474         return ret;
5475 }
5476
5477 /* Destroy the slot table */
5478 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5479 {
5480         if (session->fc_slot_table.slots != NULL) {
5481                 kfree(session->fc_slot_table.slots);
5482                 session->fc_slot_table.slots = NULL;
5483         }
5484         if (session->bc_slot_table.slots != NULL) {
5485                 kfree(session->bc_slot_table.slots);
5486                 session->bc_slot_table.slots = NULL;
5487         }
5488         return;
5489 }
5490
5491 /*
5492  * Initialize or reset the forechannel and backchannel tables
5493  */
5494 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5495 {
5496         struct nfs4_slot_table *tbl;
5497         int status;
5498
5499         dprintk("--> %s\n", __func__);
5500         /* Fore channel */
5501         tbl = &ses->fc_slot_table;
5502         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5503         if (status) /* -ENOMEM */
5504                 return status;
5505         /* Back channel */
5506         tbl = &ses->bc_slot_table;
5507         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5508         if (status && tbl->slots == NULL)
5509                 /* Fore and back channel share a connection so get
5510                  * both slot tables or neither */
5511                 nfs4_destroy_slot_tables(ses);
5512         return status;
5513 }
5514
5515 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5516 {
5517         struct nfs4_session *session;
5518         struct nfs4_slot_table *tbl;
5519
5520         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5521         if (!session)
5522                 return NULL;
5523
5524         tbl = &session->fc_slot_table;
5525         tbl->highest_used_slotid = NFS4_NO_SLOT;
5526         spin_lock_init(&tbl->slot_tbl_lock);
5527         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5528         init_completion(&tbl->complete);
5529
5530         tbl = &session->bc_slot_table;
5531         tbl->highest_used_slotid = NFS4_NO_SLOT;
5532         spin_lock_init(&tbl->slot_tbl_lock);
5533         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5534         init_completion(&tbl->complete);
5535
5536         session->session_state = 1<<NFS4_SESSION_INITING;
5537
5538         session->clp = clp;
5539         return session;
5540 }
5541
5542 void nfs4_destroy_session(struct nfs4_session *session)
5543 {
5544         struct rpc_xprt *xprt;
5545         struct rpc_cred *cred;
5546
5547         cred = nfs4_get_exchange_id_cred(session->clp);
5548         nfs4_proc_destroy_session(session, cred);
5549         if (cred)
5550                 put_rpccred(cred);
5551
5552         rcu_read_lock();
5553         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5554         rcu_read_unlock();
5555         dprintk("%s Destroy backchannel for xprt %p\n",
5556                 __func__, xprt);
5557         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5558         nfs4_destroy_slot_tables(session);
5559         kfree(session);
5560 }
5561
5562 /*
5563  * Initialize the values to be used by the client in CREATE_SESSION
5564  * If nfs4_init_session set the fore channel request and response sizes,
5565  * use them.
5566  *
5567  * Set the back channel max_resp_sz_cached to zero to force the client to
5568  * always set csa_cachethis to FALSE because the current implementation
5569  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5570  */
5571 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5572 {
5573         struct nfs4_session *session = args->client->cl_session;
5574         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5575                      mxresp_sz = session->fc_attrs.max_resp_sz;
5576
5577         if (mxrqst_sz == 0)
5578                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5579         if (mxresp_sz == 0)
5580                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5581         /* Fore channel attributes */
5582         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5583         args->fc_attrs.max_resp_sz = mxresp_sz;
5584         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5585         args->fc_attrs.max_reqs = max_session_slots;
5586
5587         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5588                 "max_ops=%u max_reqs=%u\n",
5589                 __func__,
5590                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5591                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5592
5593         /* Back channel attributes */
5594         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5595         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5596         args->bc_attrs.max_resp_sz_cached = 0;
5597         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5598         args->bc_attrs.max_reqs = 1;
5599
5600         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5601                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5602                 __func__,
5603                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5604                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5605                 args->bc_attrs.max_reqs);
5606 }
5607
5608 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5609 {
5610         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5611         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5612
5613         if (rcvd->max_resp_sz > sent->max_resp_sz)
5614                 return -EINVAL;
5615         /*
5616          * Our requested max_ops is the minimum we need; we're not
5617          * prepared to break up compounds into smaller pieces than that.
5618          * So, no point even trying to continue if the server won't
5619          * cooperate:
5620          */
5621         if (rcvd->max_ops < sent->max_ops)
5622                 return -EINVAL;
5623         if (rcvd->max_reqs == 0)
5624                 return -EINVAL;
5625         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5626                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5627         return 0;
5628 }
5629
5630 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5631 {
5632         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5633         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5634
5635         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5636                 return -EINVAL;
5637         if (rcvd->max_resp_sz < sent->max_resp_sz)
5638                 return -EINVAL;
5639         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5640                 return -EINVAL;
5641         /* These would render the backchannel useless: */
5642         if (rcvd->max_ops != sent->max_ops)
5643                 return -EINVAL;
5644         if (rcvd->max_reqs != sent->max_reqs)
5645                 return -EINVAL;
5646         return 0;
5647 }
5648
5649 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5650                                      struct nfs4_session *session)
5651 {
5652         int ret;
5653
5654         ret = nfs4_verify_fore_channel_attrs(args, session);
5655         if (ret)
5656                 return ret;
5657         return nfs4_verify_back_channel_attrs(args, session);
5658 }
5659
5660 static int _nfs4_proc_create_session(struct nfs_client *clp,
5661                 struct rpc_cred *cred)
5662 {
5663         struct nfs4_session *session = clp->cl_session;
5664         struct nfs41_create_session_args args = {
5665                 .client = clp,
5666                 .cb_program = NFS4_CALLBACK,
5667         };
5668         struct nfs41_create_session_res res = {
5669                 .client = clp,
5670         };
5671         struct rpc_message msg = {
5672                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5673                 .rpc_argp = &args,
5674                 .rpc_resp = &res,
5675                 .rpc_cred = cred,
5676         };
5677         int status;
5678
5679         nfs4_init_channel_attrs(&args);
5680         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5681
5682         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5683
5684         if (!status)
5685                 /* Verify the session's negotiated channel_attrs values */
5686                 status = nfs4_verify_channel_attrs(&args, session);
5687         if (!status) {
5688                 /* Increment the clientid slot sequence id */
5689                 clp->cl_seqid++;
5690         }
5691
5692         return status;
5693 }
5694
5695 /*
5696  * Issues a CREATE_SESSION operation to the server.
5697  * It is the responsibility of the caller to verify the session is
5698  * expired before calling this routine.
5699  */
5700 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5701 {
5702         int status;
5703         unsigned *ptr;
5704         struct nfs4_session *session = clp->cl_session;
5705
5706         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5707
5708         status = _nfs4_proc_create_session(clp, cred);
5709         if (status)
5710                 goto out;
5711
5712         /* Init or reset the session slot tables */
5713         status = nfs4_setup_session_slot_tables(session);
5714         dprintk("slot table setup returned %d\n", status);
5715         if (status)
5716                 goto out;
5717
5718         ptr = (unsigned *)&session->sess_id.data[0];
5719         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5720                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5721 out:
5722         dprintk("<-- %s\n", __func__);
5723         return status;
5724 }
5725
5726 /*
5727  * Issue the over-the-wire RPC DESTROY_SESSION.
5728  * The caller must serialize access to this routine.
5729  */
5730 int nfs4_proc_destroy_session(struct nfs4_session *session,
5731                 struct rpc_cred *cred)
5732 {
5733         struct rpc_message msg = {
5734                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5735                 .rpc_argp = session,
5736                 .rpc_cred = cred,
5737         };
5738         int status = 0;
5739
5740         dprintk("--> nfs4_proc_destroy_session\n");
5741
5742         /* session is still being setup */
5743         if (session->clp->cl_cons_state != NFS_CS_READY)
5744                 return status;
5745
5746         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5747
5748         if (status)
5749                 printk(KERN_WARNING
5750                         "NFS: Got error %d from the server on DESTROY_SESSION. "
5751                         "Session has been destroyed regardless...\n", status);
5752
5753         dprintk("<-- nfs4_proc_destroy_session\n");
5754         return status;
5755 }
5756
5757 /*
5758  * With sessions, the client is not marked ready until after a
5759  * successful EXCHANGE_ID and CREATE_SESSION.
5760  *
5761  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5762  * other versions of NFS can be tried.
5763  */
5764 static int nfs41_check_session_ready(struct nfs_client *clp)
5765 {
5766         int ret;
5767
5768         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
5769                 ret = nfs4_client_recover_expired_lease(clp);
5770                 if (ret)
5771                         return ret;
5772         }
5773         if (clp->cl_cons_state < NFS_CS_READY)
5774                 return -EPROTONOSUPPORT;
5775         smp_rmb();
5776         return 0;
5777 }
5778
5779 int nfs4_init_session(struct nfs_server *server)
5780 {
5781         struct nfs_client *clp = server->nfs_client;
5782         struct nfs4_session *session;
5783         unsigned int rsize, wsize;
5784
5785         if (!nfs4_has_session(clp))
5786                 return 0;
5787
5788         session = clp->cl_session;
5789         spin_lock(&clp->cl_lock);
5790         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5791
5792                 rsize = server->rsize;
5793                 if (rsize == 0)
5794                         rsize = NFS_MAX_FILE_IO_SIZE;
5795                 wsize = server->wsize;
5796                 if (wsize == 0)
5797                         wsize = NFS_MAX_FILE_IO_SIZE;
5798
5799                 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5800                 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5801         }
5802         spin_unlock(&clp->cl_lock);
5803
5804         return nfs41_check_session_ready(clp);
5805 }
5806
5807 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
5808 {
5809         struct nfs4_session *session = clp->cl_session;
5810         int ret;
5811
5812         spin_lock(&clp->cl_lock);
5813         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
5814                 /*
5815                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
5816                  * DS lease to be equal to the MDS lease.
5817                  */
5818                 clp->cl_lease_time = lease_time;
5819                 clp->cl_last_renewal = jiffies;
5820         }
5821         spin_unlock(&clp->cl_lock);
5822
5823         ret = nfs41_check_session_ready(clp);
5824         if (ret)
5825                 return ret;
5826         /* Test for the DS role */
5827         if (!is_ds_client(clp))
5828                 return -ENODEV;
5829         return 0;
5830 }
5831 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5832
5833
5834 /*
5835  * Renew the cl_session lease.
5836  */
5837 struct nfs4_sequence_data {
5838         struct nfs_client *clp;
5839         struct nfs4_sequence_args args;
5840         struct nfs4_sequence_res res;
5841 };
5842
5843 static void nfs41_sequence_release(void *data)
5844 {
5845         struct nfs4_sequence_data *calldata = data;
5846         struct nfs_client *clp = calldata->clp;
5847
5848         if (atomic_read(&clp->cl_count) > 1)
5849                 nfs4_schedule_state_renewal(clp);
5850         nfs_put_client(clp);
5851         kfree(calldata);
5852 }
5853
5854 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5855 {
5856         switch(task->tk_status) {
5857         case -NFS4ERR_DELAY:
5858                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5859                 return -EAGAIN;
5860         default:
5861                 nfs4_schedule_lease_recovery(clp);
5862         }
5863         return 0;
5864 }
5865
5866 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5867 {
5868         struct nfs4_sequence_data *calldata = data;
5869         struct nfs_client *clp = calldata->clp;
5870
5871         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5872                 return;
5873
5874         if (task->tk_status < 0) {
5875                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5876                 if (atomic_read(&clp->cl_count) == 1)
5877                         goto out;
5878
5879                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5880                         rpc_restart_call_prepare(task);
5881                         return;
5882                 }
5883         }
5884         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5885 out:
5886         dprintk("<-- %s\n", __func__);
5887 }
5888
5889 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5890 {
5891         struct nfs4_sequence_data *calldata = data;
5892         struct nfs_client *clp = calldata->clp;
5893         struct nfs4_sequence_args *args;
5894         struct nfs4_sequence_res *res;
5895
5896         args = task->tk_msg.rpc_argp;
5897         res = task->tk_msg.rpc_resp;
5898
5899         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5900                 return;
5901         rpc_call_start(task);
5902 }
5903
5904 static const struct rpc_call_ops nfs41_sequence_ops = {
5905         .rpc_call_done = nfs41_sequence_call_done,
5906         .rpc_call_prepare = nfs41_sequence_prepare,
5907         .rpc_release = nfs41_sequence_release,
5908 };
5909
5910 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5911 {
5912         struct nfs4_sequence_data *calldata;
5913         struct rpc_message msg = {
5914                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5915                 .rpc_cred = cred,
5916         };
5917         struct rpc_task_setup task_setup_data = {
5918                 .rpc_client = clp->cl_rpcclient,
5919                 .rpc_message = &msg,
5920                 .callback_ops = &nfs41_sequence_ops,
5921                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5922         };
5923
5924         if (!atomic_inc_not_zero(&clp->cl_count))
5925                 return ERR_PTR(-EIO);
5926         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5927         if (calldata == NULL) {
5928                 nfs_put_client(clp);
5929                 return ERR_PTR(-ENOMEM);
5930         }
5931         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5932         msg.rpc_argp = &calldata->args;
5933         msg.rpc_resp = &calldata->res;
5934         calldata->clp = clp;
5935         task_setup_data.callback_data = calldata;
5936
5937         return rpc_run_task(&task_setup_data);
5938 }
5939
5940 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5941 {
5942         struct rpc_task *task;
5943         int ret = 0;
5944
5945         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5946                 return 0;
5947         task = _nfs41_proc_sequence(clp, cred);
5948         if (IS_ERR(task))
5949                 ret = PTR_ERR(task);
5950         else
5951                 rpc_put_task_async(task);
5952         dprintk("<-- %s status=%d\n", __func__, ret);
5953         return ret;
5954 }
5955
5956 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5957 {
5958         struct rpc_task *task;
5959         int ret;
5960
5961         task = _nfs41_proc_sequence(clp, cred);
5962         if (IS_ERR(task)) {
5963                 ret = PTR_ERR(task);
5964                 goto out;
5965         }
5966         ret = rpc_wait_for_completion_task(task);
5967         if (!ret) {
5968                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5969
5970                 if (task->tk_status == 0)
5971                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5972                 ret = task->tk_status;
5973         }
5974         rpc_put_task(task);
5975 out:
5976         dprintk("<-- %s status=%d\n", __func__, ret);
5977         return ret;
5978 }
5979
5980 struct nfs4_reclaim_complete_data {
5981         struct nfs_client *clp;
5982         struct nfs41_reclaim_complete_args arg;
5983         struct nfs41_reclaim_complete_res res;
5984 };
5985
5986 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5987 {
5988         struct nfs4_reclaim_complete_data *calldata = data;
5989
5990         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5991         if (nfs41_setup_sequence(calldata->clp->cl_session,
5992                                 &calldata->arg.seq_args,
5993                                 &calldata->res.seq_res, task))
5994                 return;
5995
5996         rpc_call_start(task);
5997 }
5998
5999 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6000 {
6001         switch(task->tk_status) {
6002         case 0:
6003         case -NFS4ERR_COMPLETE_ALREADY:
6004         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6005                 break;
6006         case -NFS4ERR_DELAY:
6007                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6008                 /* fall through */
6009         case -NFS4ERR_RETRY_UNCACHED_REP:
6010                 return -EAGAIN;
6011         default:
6012                 nfs4_schedule_lease_recovery(clp);
6013         }
6014         return 0;
6015 }
6016
6017 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6018 {
6019         struct nfs4_reclaim_complete_data *calldata = data;
6020         struct nfs_client *clp = calldata->clp;
6021         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6022
6023         dprintk("--> %s\n", __func__);
6024         if (!nfs41_sequence_done(task, res))
6025                 return;
6026
6027         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6028                 rpc_restart_call_prepare(task);
6029                 return;
6030         }
6031         dprintk("<-- %s\n", __func__);
6032 }
6033
6034 static void nfs4_free_reclaim_complete_data(void *data)
6035 {
6036         struct nfs4_reclaim_complete_data *calldata = data;
6037
6038         kfree(calldata);
6039 }
6040
6041 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6042         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6043         .rpc_call_done = nfs4_reclaim_complete_done,
6044         .rpc_release = nfs4_free_reclaim_complete_data,
6045 };
6046
6047 /*
6048  * Issue a global reclaim complete.
6049  */
6050 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6051 {
6052         struct nfs4_reclaim_complete_data *calldata;
6053         struct rpc_task *task;
6054         struct rpc_message msg = {
6055                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6056         };
6057         struct rpc_task_setup task_setup_data = {
6058                 .rpc_client = clp->cl_rpcclient,
6059                 .rpc_message = &msg,
6060                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6061                 .flags = RPC_TASK_ASYNC,
6062         };
6063         int status = -ENOMEM;
6064
6065         dprintk("--> %s\n", __func__);
6066         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6067         if (calldata == NULL)
6068                 goto out;
6069         calldata->clp = clp;
6070         calldata->arg.one_fs = 0;
6071
6072         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6073         msg.rpc_argp = &calldata->arg;
6074         msg.rpc_resp = &calldata->res;
6075         task_setup_data.callback_data = calldata;
6076         task = rpc_run_task(&task_setup_data);
6077         if (IS_ERR(task)) {
6078                 status = PTR_ERR(task);
6079                 goto out;
6080         }
6081         status = nfs4_wait_for_completion_rpc_task(task);
6082         if (status == 0)
6083                 status = task->tk_status;
6084         rpc_put_task(task);
6085         return 0;
6086 out:
6087         dprintk("<-- %s status=%d\n", __func__, status);
6088         return status;
6089 }
6090
6091 static void
6092 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6093 {
6094         struct nfs4_layoutget *lgp = calldata;
6095         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6096
6097         dprintk("--> %s\n", __func__);
6098         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6099          * right now covering the LAYOUTGET we are about to send.
6100          * However, that is not so catastrophic, and there seems
6101          * to be no way to prevent it completely.
6102          */
6103         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6104                                 &lgp->res.seq_res, task))
6105                 return;
6106         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6107                                           NFS_I(lgp->args.inode)->layout,
6108                                           lgp->args.ctx->state)) {
6109                 rpc_exit(task, NFS4_OK);
6110                 return;
6111         }
6112         rpc_call_start(task);
6113 }
6114
6115 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6116 {
6117         struct nfs4_layoutget *lgp = calldata;
6118         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6119
6120         dprintk("--> %s\n", __func__);
6121
6122         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6123                 return;
6124
6125         switch (task->tk_status) {
6126         case 0:
6127                 break;
6128         case -NFS4ERR_LAYOUTTRYLATER:
6129         case -NFS4ERR_RECALLCONFLICT:
6130                 task->tk_status = -NFS4ERR_DELAY;
6131                 /* Fall through */
6132         default:
6133                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6134                         rpc_restart_call_prepare(task);
6135                         return;
6136                 }
6137         }
6138         dprintk("<-- %s\n", __func__);
6139 }
6140
6141 static void nfs4_layoutget_release(void *calldata)
6142 {
6143         struct nfs4_layoutget *lgp = calldata;
6144
6145         dprintk("--> %s\n", __func__);
6146         put_nfs_open_context(lgp->args.ctx);
6147         kfree(calldata);
6148         dprintk("<-- %s\n", __func__);
6149 }
6150
6151 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6152         .rpc_call_prepare = nfs4_layoutget_prepare,
6153         .rpc_call_done = nfs4_layoutget_done,
6154         .rpc_release = nfs4_layoutget_release,
6155 };
6156
6157 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
6158 {
6159         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6160         struct rpc_task *task;
6161         struct rpc_message msg = {
6162                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6163                 .rpc_argp = &lgp->args,
6164                 .rpc_resp = &lgp->res,
6165         };
6166         struct rpc_task_setup task_setup_data = {
6167                 .rpc_client = server->client,
6168                 .rpc_message = &msg,
6169                 .callback_ops = &nfs4_layoutget_call_ops,
6170                 .callback_data = lgp,
6171                 .flags = RPC_TASK_ASYNC,
6172         };
6173         int status = 0;
6174
6175         dprintk("--> %s\n", __func__);
6176
6177         lgp->res.layoutp = &lgp->args.layout;
6178         lgp->res.seq_res.sr_slot = NULL;
6179         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6180         task = rpc_run_task(&task_setup_data);
6181         if (IS_ERR(task))
6182                 return PTR_ERR(task);
6183         status = nfs4_wait_for_completion_rpc_task(task);
6184         if (status == 0)
6185                 status = task->tk_status;
6186         if (status == 0)
6187                 status = pnfs_layout_process(lgp);
6188         rpc_put_task(task);
6189         dprintk("<-- %s status=%d\n", __func__, status);
6190         return status;
6191 }
6192
6193 static void
6194 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6195 {
6196         struct nfs4_layoutreturn *lrp = calldata;
6197
6198         dprintk("--> %s\n", __func__);
6199         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6200                                 &lrp->res.seq_res, task))
6201                 return;
6202         rpc_call_start(task);
6203 }
6204
6205 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6206 {
6207         struct nfs4_layoutreturn *lrp = calldata;
6208         struct nfs_server *server;
6209         struct pnfs_layout_hdr *lo = lrp->args.layout;
6210
6211         dprintk("--> %s\n", __func__);
6212
6213         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6214                 return;
6215
6216         server = NFS_SERVER(lrp->args.inode);
6217         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6218                 rpc_restart_call_prepare(task);
6219                 return;
6220         }
6221         spin_lock(&lo->plh_inode->i_lock);
6222         if (task->tk_status == 0) {
6223                 if (lrp->res.lrs_present) {
6224                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6225                 } else
6226                         BUG_ON(!list_empty(&lo->plh_segs));
6227         }
6228         lo->plh_block_lgets--;
6229         spin_unlock(&lo->plh_inode->i_lock);
6230         dprintk("<-- %s\n", __func__);
6231 }
6232
6233 static void nfs4_layoutreturn_release(void *calldata)
6234 {
6235         struct nfs4_layoutreturn *lrp = calldata;
6236
6237         dprintk("--> %s\n", __func__);
6238         put_layout_hdr(lrp->args.layout);
6239         kfree(calldata);
6240         dprintk("<-- %s\n", __func__);
6241 }
6242
6243 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6244         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6245         .rpc_call_done = nfs4_layoutreturn_done,
6246         .rpc_release = nfs4_layoutreturn_release,
6247 };
6248
6249 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6250 {
6251         struct rpc_task *task;
6252         struct rpc_message msg = {
6253                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6254                 .rpc_argp = &lrp->args,
6255                 .rpc_resp = &lrp->res,
6256         };
6257         struct rpc_task_setup task_setup_data = {
6258                 .rpc_client = lrp->clp->cl_rpcclient,
6259                 .rpc_message = &msg,
6260                 .callback_ops = &nfs4_layoutreturn_call_ops,
6261                 .callback_data = lrp,
6262         };
6263         int status;
6264
6265         dprintk("--> %s\n", __func__);
6266         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6267         task = rpc_run_task(&task_setup_data);
6268         if (IS_ERR(task))
6269                 return PTR_ERR(task);
6270         status = task->tk_status;
6271         dprintk("<-- %s status=%d\n", __func__, status);
6272         rpc_put_task(task);
6273         return status;
6274 }
6275
6276 /*
6277  * Retrieve the list of Data Server devices from the MDS.
6278  */
6279 static int _nfs4_getdevicelist(struct nfs_server *server,
6280                                     const struct nfs_fh *fh,
6281                                     struct pnfs_devicelist *devlist)
6282 {
6283         struct nfs4_getdevicelist_args args = {
6284                 .fh = fh,
6285                 .layoutclass = server->pnfs_curr_ld->id,
6286         };
6287         struct nfs4_getdevicelist_res res = {
6288                 .devlist = devlist,
6289         };
6290         struct rpc_message msg = {
6291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6292                 .rpc_argp = &args,
6293                 .rpc_resp = &res,
6294         };
6295         int status;
6296
6297         dprintk("--> %s\n", __func__);
6298         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6299                                 &res.seq_res, 0);
6300         dprintk("<-- %s status=%d\n", __func__, status);
6301         return status;
6302 }
6303
6304 int nfs4_proc_getdevicelist(struct nfs_server *server,
6305                             const struct nfs_fh *fh,
6306                             struct pnfs_devicelist *devlist)
6307 {
6308         struct nfs4_exception exception = { };
6309         int err;
6310
6311         do {
6312                 err = nfs4_handle_exception(server,
6313                                 _nfs4_getdevicelist(server, fh, devlist),
6314                                 &exception);
6315         } while (exception.retry);
6316
6317         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6318                 err, devlist->num_devs);
6319
6320         return err;
6321 }
6322 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6323
6324 static int
6325 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6326 {
6327         struct nfs4_getdeviceinfo_args args = {
6328                 .pdev = pdev,
6329         };
6330         struct nfs4_getdeviceinfo_res res = {
6331                 .pdev = pdev,
6332         };
6333         struct rpc_message msg = {
6334                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6335                 .rpc_argp = &args,
6336                 .rpc_resp = &res,
6337         };
6338         int status;
6339
6340         dprintk("--> %s\n", __func__);
6341         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6342         dprintk("<-- %s status=%d\n", __func__, status);
6343
6344         return status;
6345 }
6346
6347 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6348 {
6349         struct nfs4_exception exception = { };
6350         int err;
6351
6352         do {
6353                 err = nfs4_handle_exception(server,
6354                                         _nfs4_proc_getdeviceinfo(server, pdev),
6355                                         &exception);
6356         } while (exception.retry);
6357         return err;
6358 }
6359 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6360
6361 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6362 {
6363         struct nfs4_layoutcommit_data *data = calldata;
6364         struct nfs_server *server = NFS_SERVER(data->args.inode);
6365
6366         if (nfs4_setup_sequence(server, &data->args.seq_args,
6367                                 &data->res.seq_res, task))
6368                 return;
6369         rpc_call_start(task);
6370 }
6371
6372 static void
6373 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6374 {
6375         struct nfs4_layoutcommit_data *data = calldata;
6376         struct nfs_server *server = NFS_SERVER(data->args.inode);
6377
6378         if (!nfs4_sequence_done(task, &data->res.seq_res))
6379                 return;
6380
6381         switch (task->tk_status) { /* Just ignore these failures */
6382         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6383         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6384         case -NFS4ERR_BADLAYOUT:     /* no layout */
6385         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6386                 task->tk_status = 0;
6387                 break;
6388         case 0:
6389                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6390                                                    data->res.fattr);
6391                 break;
6392         default:
6393                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6394                         rpc_restart_call_prepare(task);
6395                         return;
6396                 }
6397         }
6398 }
6399
6400 static void nfs4_layoutcommit_release(void *calldata)
6401 {
6402         struct nfs4_layoutcommit_data *data = calldata;
6403         struct pnfs_layout_segment *lseg, *tmp;
6404         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6405
6406         pnfs_cleanup_layoutcommit(data);
6407         /* Matched by references in pnfs_set_layoutcommit */
6408         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6409                 list_del_init(&lseg->pls_lc_list);
6410                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6411                                        &lseg->pls_flags))
6412                         put_lseg(lseg);
6413         }
6414
6415         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6416         smp_mb__after_clear_bit();
6417         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6418
6419         put_rpccred(data->cred);
6420         kfree(data);
6421 }
6422
6423 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6424         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6425         .rpc_call_done = nfs4_layoutcommit_done,
6426         .rpc_release = nfs4_layoutcommit_release,
6427 };
6428
6429 int
6430 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6431 {
6432         struct rpc_message msg = {
6433                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6434                 .rpc_argp = &data->args,
6435                 .rpc_resp = &data->res,
6436                 .rpc_cred = data->cred,
6437         };
6438         struct rpc_task_setup task_setup_data = {
6439                 .task = &data->task,
6440                 .rpc_client = NFS_CLIENT(data->args.inode),
6441                 .rpc_message = &msg,
6442                 .callback_ops = &nfs4_layoutcommit_ops,
6443                 .callback_data = data,
6444                 .flags = RPC_TASK_ASYNC,
6445         };
6446         struct rpc_task *task;
6447         int status = 0;
6448
6449         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6450                 "lbw: %llu inode %lu\n",
6451                 data->task.tk_pid, sync,
6452                 data->args.lastbytewritten,
6453                 data->args.inode->i_ino);
6454
6455         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6456         task = rpc_run_task(&task_setup_data);
6457         if (IS_ERR(task))
6458                 return PTR_ERR(task);
6459         if (sync == false)
6460                 goto out;
6461         status = nfs4_wait_for_completion_rpc_task(task);
6462         if (status != 0)
6463                 goto out;
6464         status = task->tk_status;
6465 out:
6466         dprintk("%s: status %d\n", __func__, status);
6467         rpc_put_task(task);
6468         return status;
6469 }
6470
6471 static int
6472 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6473                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6474 {
6475         struct nfs41_secinfo_no_name_args args = {
6476                 .style = SECINFO_STYLE_CURRENT_FH,
6477         };
6478         struct nfs4_secinfo_res res = {
6479                 .flavors = flavors,
6480         };
6481         struct rpc_message msg = {
6482                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6483                 .rpc_argp = &args,
6484                 .rpc_resp = &res,
6485         };
6486         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6487 }
6488
6489 static int
6490 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6491                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6492 {
6493         struct nfs4_exception exception = { };
6494         int err;
6495         do {
6496                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6497                 switch (err) {
6498                 case 0:
6499                 case -NFS4ERR_WRONGSEC:
6500                 case -NFS4ERR_NOTSUPP:
6501                         goto out;
6502                 default:
6503                         err = nfs4_handle_exception(server, err, &exception);
6504                 }
6505         } while (exception.retry);
6506 out:
6507         return err;
6508 }
6509
6510 static int
6511 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6512                     struct nfs_fsinfo *info)
6513 {
6514         int err;
6515         struct page *page;
6516         rpc_authflavor_t flavor;
6517         struct nfs4_secinfo_flavors *flavors;
6518
6519         page = alloc_page(GFP_KERNEL);
6520         if (!page) {
6521                 err = -ENOMEM;
6522                 goto out;
6523         }
6524
6525         flavors = page_address(page);
6526         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6527
6528         /*
6529          * Fall back on "guess and check" method if
6530          * the server doesn't support SECINFO_NO_NAME
6531          */
6532         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6533                 err = nfs4_find_root_sec(server, fhandle, info);
6534                 goto out_freepage;
6535         }
6536         if (err)
6537                 goto out_freepage;
6538
6539         flavor = nfs_find_best_sec(flavors);
6540         if (err == 0)
6541                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6542
6543 out_freepage:
6544         put_page(page);
6545         if (err == -EACCES)
6546                 return -EPERM;
6547 out:
6548         return err;
6549 }
6550
6551 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6552 {
6553         int status;
6554         struct nfs41_test_stateid_args args = {
6555                 .stateid = stateid,
6556         };
6557         struct nfs41_test_stateid_res res;
6558         struct rpc_message msg = {
6559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6560                 .rpc_argp = &args,
6561                 .rpc_resp = &res,
6562         };
6563
6564         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6565         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6566
6567         if (status == NFS_OK)
6568                 return res.status;
6569         return status;
6570 }
6571
6572 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6573 {
6574         struct nfs4_exception exception = { };
6575         int err;
6576         do {
6577                 err = nfs4_handle_exception(server,
6578                                 _nfs41_test_stateid(server, stateid),
6579                                 &exception);
6580         } while (exception.retry);
6581         return err;
6582 }
6583
6584 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6585 {
6586         struct nfs41_free_stateid_args args = {
6587                 .stateid = stateid,
6588         };
6589         struct nfs41_free_stateid_res res;
6590         struct rpc_message msg = {
6591                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6592                 .rpc_argp = &args,
6593                 .rpc_resp = &res,
6594         };
6595
6596         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6597         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6598 }
6599
6600 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6601 {
6602         struct nfs4_exception exception = { };
6603         int err;
6604         do {
6605                 err = nfs4_handle_exception(server,
6606                                 _nfs4_free_stateid(server, stateid),
6607                                 &exception);
6608         } while (exception.retry);
6609         return err;
6610 }
6611
6612 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6613                 const nfs4_stateid *s2)
6614 {
6615         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6616                 return false;
6617
6618         if (s1->seqid == s2->seqid)
6619                 return true;
6620         if (s1->seqid == 0 || s2->seqid == 0)
6621                 return true;
6622
6623         return false;
6624 }
6625
6626 #endif /* CONFIG_NFS_V4_1 */
6627
6628 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6629                 const nfs4_stateid *s2)
6630 {
6631         return nfs4_stateid_match(s1, s2);
6632 }
6633
6634
6635 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6636         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6637         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6638         .recover_open   = nfs4_open_reclaim,
6639         .recover_lock   = nfs4_lock_reclaim,
6640         .establish_clid = nfs4_init_clientid,
6641         .get_clid_cred  = nfs4_get_setclientid_cred,
6642 };
6643
6644 #if defined(CONFIG_NFS_V4_1)
6645 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6646         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6647         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6648         .recover_open   = nfs4_open_reclaim,
6649         .recover_lock   = nfs4_lock_reclaim,
6650         .establish_clid = nfs41_init_clientid,
6651         .get_clid_cred  = nfs4_get_exchange_id_cred,
6652         .reclaim_complete = nfs41_proc_reclaim_complete,
6653 };
6654 #endif /* CONFIG_NFS_V4_1 */
6655
6656 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6657         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6658         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6659         .recover_open   = nfs4_open_expired,
6660         .recover_lock   = nfs4_lock_expired,
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_nograce_recovery_ops = {
6667         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6668         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6669         .recover_open   = nfs41_open_expired,
6670         .recover_lock   = nfs41_lock_expired,
6671         .establish_clid = nfs41_init_clientid,
6672         .get_clid_cred  = nfs4_get_exchange_id_cred,
6673 };
6674 #endif /* CONFIG_NFS_V4_1 */
6675
6676 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6677         .sched_state_renewal = nfs4_proc_async_renew,
6678         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6679         .renew_lease = nfs4_proc_renew,
6680 };
6681
6682 #if defined(CONFIG_NFS_V4_1)
6683 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6684         .sched_state_renewal = nfs41_proc_async_sequence,
6685         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6686         .renew_lease = nfs4_proc_sequence,
6687 };
6688 #endif
6689
6690 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6691         .minor_version = 0,
6692         .call_sync = _nfs4_call_sync,
6693         .match_stateid = nfs4_match_stateid,
6694         .find_root_sec = nfs4_find_root_sec,
6695         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6696         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6697         .state_renewal_ops = &nfs40_state_renewal_ops,
6698 };
6699
6700 #if defined(CONFIG_NFS_V4_1)
6701 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6702         .minor_version = 1,
6703         .call_sync = _nfs4_call_sync_session,
6704         .match_stateid = nfs41_match_stateid,
6705         .find_root_sec = nfs41_find_root_sec,
6706         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6707         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6708         .state_renewal_ops = &nfs41_state_renewal_ops,
6709 };
6710 #endif
6711
6712 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6713         [0] = &nfs_v4_0_minor_ops,
6714 #if defined(CONFIG_NFS_V4_1)
6715         [1] = &nfs_v4_1_minor_ops,
6716 #endif
6717 };
6718
6719 static const struct inode_operations nfs4_file_inode_operations = {
6720         .permission     = nfs_permission,
6721         .getattr        = nfs_getattr,
6722         .setattr        = nfs_setattr,
6723         .getxattr       = generic_getxattr,
6724         .setxattr       = generic_setxattr,
6725         .listxattr      = generic_listxattr,
6726         .removexattr    = generic_removexattr,
6727 };
6728
6729 const struct nfs_rpc_ops nfs_v4_clientops = {
6730         .version        = 4,                    /* protocol version */
6731         .dentry_ops     = &nfs4_dentry_operations,
6732         .dir_inode_ops  = &nfs4_dir_inode_operations,
6733         .file_inode_ops = &nfs4_file_inode_operations,
6734         .file_ops       = &nfs4_file_operations,
6735         .getroot        = nfs4_proc_get_root,
6736         .submount       = nfs4_submount,
6737         .getattr        = nfs4_proc_getattr,
6738         .setattr        = nfs4_proc_setattr,
6739         .lookup         = nfs4_proc_lookup,
6740         .access         = nfs4_proc_access,
6741         .readlink       = nfs4_proc_readlink,
6742         .create         = nfs4_proc_create,
6743         .remove         = nfs4_proc_remove,
6744         .unlink_setup   = nfs4_proc_unlink_setup,
6745         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6746         .unlink_done    = nfs4_proc_unlink_done,
6747         .rename         = nfs4_proc_rename,
6748         .rename_setup   = nfs4_proc_rename_setup,
6749         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6750         .rename_done    = nfs4_proc_rename_done,
6751         .link           = nfs4_proc_link,
6752         .symlink        = nfs4_proc_symlink,
6753         .mkdir          = nfs4_proc_mkdir,
6754         .rmdir          = nfs4_proc_remove,
6755         .readdir        = nfs4_proc_readdir,
6756         .mknod          = nfs4_proc_mknod,
6757         .statfs         = nfs4_proc_statfs,
6758         .fsinfo         = nfs4_proc_fsinfo,
6759         .pathconf       = nfs4_proc_pathconf,
6760         .set_capabilities = nfs4_server_capabilities,
6761         .decode_dirent  = nfs4_decode_dirent,
6762         .read_setup     = nfs4_proc_read_setup,
6763         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6764         .read_done      = nfs4_read_done,
6765         .write_setup    = nfs4_proc_write_setup,
6766         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6767         .write_done     = nfs4_write_done,
6768         .commit_setup   = nfs4_proc_commit_setup,
6769         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6770         .commit_done    = nfs4_commit_done,
6771         .lock           = nfs4_proc_lock,
6772         .clear_acl_cache = nfs4_zap_acl_attr,
6773         .close_context  = nfs4_close_context,
6774         .open_context   = nfs4_atomic_open,
6775         .init_client    = nfs4_init_client,
6776 };
6777
6778 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6779         .prefix = XATTR_NAME_NFSV4_ACL,
6780         .list   = nfs4_xattr_list_nfs4_acl,
6781         .get    = nfs4_xattr_get_nfs4_acl,
6782         .set    = nfs4_xattr_set_nfs4_acl,
6783 };
6784
6785 const struct xattr_handler *nfs4_xattr_handlers[] = {
6786         &nfs4_xattr_nfs4_acl_handler,
6787         NULL
6788 };
6789
6790 module_param(max_session_slots, ushort, 0644);
6791 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6792                 "requests the client will negotiate");
6793
6794 /*
6795  * Local variables:
6796  *  c-basic-offset: 8
6797  * End:
6798  */