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/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/sunrpc/gss_api.h>
  45 #include <linux/nfs.h>
  46 #include <linux/nfs4.h>
  47 #include <linux/nfs_fs.h>
  48 #include <linux/nfs_page.h>
  49 #include <linux/nfs_mount.h>
  50 #include <linux/namei.h>
  51 #include <linux/mount.h>
  52 #include <linux/module.h>
  53 #include <linux/sunrpc/bc_xprt.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56
  57 #include "nfs4_fs.h"
  58 #include "delegation.h"
  59 #include "internal.h"
  60 #include "iostat.h"
  61 #include "callback.h"
  62 #include "pnfs.h"
  63
  64 #define NFSDBG_FACILITY         NFSDBG_PROC
  65
  66 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  67 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  68
  69 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  70
  71 struct nfs4_opendata;
  72 static int _nfs4_proc_open(struct nfs4_opendata *data);
  73 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  74 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  75 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  76 static int _nfs4_proc_lookup(struct rpc_clnt *client, struct inode *dir,
  77                              const struct qstr *name, struct nfs_fh *fhandle,
  78                              struct nfs_fattr *fattr);
  79 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  80 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  81                             struct nfs_fattr *fattr, struct iattr *sattr,
  82                             struct nfs4_state *state);
  83 #ifdef CONFIG_NFS_V4_1
  84 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  85 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  86 #endif
  87 /* Prevent leaks of NFSv4 errors into userland */
  88 static int nfs4_map_errors(int err)
  89 {
  90         if (err >= -1000)
  91                 return err;
  92         switch (err) {
  93         case -NFS4ERR_RESOURCE:
  94                 return -EREMOTEIO;
  95         case -NFS4ERR_WRONGSEC:
  96                 return -EPERM;
  97         case -NFS4ERR_BADOWNER:
  98         case -NFS4ERR_BADNAME:
  99                 return -EINVAL;
 100         default:
 101                 dprintk("%s could not handle NFSv4 error %d\n",
 102                                 __func__, -err);
 103                 break;
 104         }
 105         return -EIO;
 106 }
 107
 108 /*
 109  * This is our standard bitmap for GETATTR requests.
 110  */
 111 const u32 nfs4_fattr_bitmap[2] = {
 112         FATTR4_WORD0_TYPE
 113         | FATTR4_WORD0_CHANGE
 114         | FATTR4_WORD0_SIZE
 115         | FATTR4_WORD0_FSID
 116         | FATTR4_WORD0_FILEID,
 117         FATTR4_WORD1_MODE
 118         | FATTR4_WORD1_NUMLINKS
 119         | FATTR4_WORD1_OWNER
 120         | FATTR4_WORD1_OWNER_GROUP
 121         | FATTR4_WORD1_RAWDEV
 122         | FATTR4_WORD1_SPACE_USED
 123         | FATTR4_WORD1_TIME_ACCESS
 124         | FATTR4_WORD1_TIME_METADATA
 125         | FATTR4_WORD1_TIME_MODIFY
 126 };
 127
 128 const u32 nfs4_statfs_bitmap[2] = {
 129         FATTR4_WORD0_FILES_AVAIL
 130         | FATTR4_WORD0_FILES_FREE
 131         | FATTR4_WORD0_FILES_TOTAL,
 132         FATTR4_WORD1_SPACE_AVAIL
 133         | FATTR4_WORD1_SPACE_FREE
 134         | FATTR4_WORD1_SPACE_TOTAL
 135 };
 136
 137 const u32 nfs4_pathconf_bitmap[2] = {
 138         FATTR4_WORD0_MAXLINK
 139         | FATTR4_WORD0_MAXNAME,
 140         0
 141 };
 142
 143 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 144                         | FATTR4_WORD0_MAXREAD
 145                         | FATTR4_WORD0_MAXWRITE
 146                         | FATTR4_WORD0_LEASE_TIME,
 147                         FATTR4_WORD1_TIME_DELTA
 148                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 149 };
 150
 151 const u32 nfs4_fs_locations_bitmap[2] = {
 152         FATTR4_WORD0_TYPE
 153         | FATTR4_WORD0_CHANGE
 154         | FATTR4_WORD0_SIZE
 155         | FATTR4_WORD0_FSID
 156         | FATTR4_WORD0_FILEID
 157         | FATTR4_WORD0_FS_LOCATIONS,
 158         FATTR4_WORD1_MODE
 159         | FATTR4_WORD1_NUMLINKS
 160         | FATTR4_WORD1_OWNER
 161         | FATTR4_WORD1_OWNER_GROUP
 162         | FATTR4_WORD1_RAWDEV
 163         | FATTR4_WORD1_SPACE_USED
 164         | FATTR4_WORD1_TIME_ACCESS
 165         | FATTR4_WORD1_TIME_METADATA
 166         | FATTR4_WORD1_TIME_MODIFY
 167         | FATTR4_WORD1_MOUNTED_ON_FILEID
 168 };
 169
 170 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 171                 struct nfs4_readdir_arg *readdir)
 172 {
 173         __be32 *start, *p;
 174
 175         BUG_ON(readdir->count < 80);
 176         if (cookie > 2) {
 177                 readdir->cookie = cookie;
 178                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 179                 return;
 180         }
 181
 182         readdir->cookie = 0;
 183         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 184         if (cookie == 2)
 185                 return;
 186
 187         /*
 188          * NFSv4 servers do not return entries for '.' and '..'
 189          * Therefore, we fake these entries here.  We let '.'
 190          * have cookie 0 and '..' have cookie 1.  Note that
 191          * when talking to the server, we always send cookie 0
 192          * instead of 1 or 2.
 193          */
 194         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 195
 196         if (cookie == 0) {
 197                 *p++ = xdr_one;                                  /* next */
 198                 *p++ = xdr_zero;                   /* cookie, first word */
 199                 *p++ = xdr_one;                   /* cookie, second word */
 200                 *p++ = xdr_one;                             /* entry len */
 201                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 202                 p++;
 203                 *p++ = xdr_one;                         /* bitmap length */
 204                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 205                 *p++ = htonl(8);              /* attribute buffer length */
 206                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 207         }
 208
 209         *p++ = xdr_one;                                  /* next */
 210         *p++ = xdr_zero;                   /* cookie, first word */
 211         *p++ = xdr_two;                   /* cookie, second word */
 212         *p++ = xdr_two;                             /* entry len */
 213         memcpy(p, "..\0\0", 4);                         /* entry */
 214         p++;
 215         *p++ = xdr_one;                         /* bitmap length */
 216         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 217         *p++ = htonl(8);              /* attribute buffer length */
 218         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 219
 220         readdir->pgbase = (char *)p - (char *)start;
 221         readdir->count -= readdir->pgbase;
 222         kunmap_atomic(start, KM_USER0);
 223 }
 224
 225 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 226 {
 227         int res;
 228
 229         might_sleep();
 230
 231         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 232                         nfs_wait_bit_killable, TASK_KILLABLE);
 233         return res;
 234 }
 235
 236 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 237 {
 238         int res = 0;
 239
 240         might_sleep();
 241
 242         if (*timeout <= 0)
 243                 *timeout = NFS4_POLL_RETRY_MIN;
 244         if (*timeout > NFS4_POLL_RETRY_MAX)
 245                 *timeout = NFS4_POLL_RETRY_MAX;
 246         schedule_timeout_killable(*timeout);
 247         if (fatal_signal_pending(current))
 248                 res = -ERESTARTSYS;
 249         *timeout <<= 1;
 250         return res;
 251 }
 252
 253 /* This is the error handling routine for processes that are allowed
 254  * to sleep.
 255  */
 256 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 257 {
 258         struct nfs_client *clp = server->nfs_client;
 259         struct nfs4_state *state = exception->state;
 260         int ret = errorcode;
 261
 262         exception->retry = 0;
 263         switch(errorcode) {
 264                 case 0:
 265                         return 0;
 266                 case -NFS4ERR_ADMIN_REVOKED:
 267                 case -NFS4ERR_BAD_STATEID:
 268                 case -NFS4ERR_OPENMODE:
 269                         if (state == NULL)
 270                                 break;
 271                         nfs4_schedule_stateid_recovery(server, state);
 272                         goto wait_on_recovery;
 273                 case -NFS4ERR_EXPIRED:
 274                         if (state != NULL)
 275                                 nfs4_schedule_stateid_recovery(server, state);
 276                 case -NFS4ERR_STALE_STATEID:
 277                 case -NFS4ERR_STALE_CLIENTID:
 278                         nfs4_schedule_lease_recovery(clp);
 279                         goto wait_on_recovery;
 280 #if defined(CONFIG_NFS_V4_1)
 281                 case -NFS4ERR_BADSESSION:
 282                 case -NFS4ERR_BADSLOT:
 283                 case -NFS4ERR_BAD_HIGH_SLOT:
 284                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 285                 case -NFS4ERR_DEADSESSION:
 286                 case -NFS4ERR_SEQ_FALSE_RETRY:
 287                 case -NFS4ERR_SEQ_MISORDERED:
 288                         dprintk("%s ERROR: %d Reset session\n", __func__,
 289                                 errorcode);
 290                         nfs4_schedule_session_recovery(clp->cl_session);
 291                         exception->retry = 1;
 292                         break;
 293 #endif /* defined(CONFIG_NFS_V4_1) */
 294                 case -NFS4ERR_FILE_OPEN:
 295                         if (exception->timeout > HZ) {
 296                                 /* We have retried a decent amount, time to
 297                                  * fail
 298                                  */
 299                                 ret = -EBUSY;
 300                                 break;
 301                         }
 302                 case -NFS4ERR_GRACE:
 303                 case -NFS4ERR_DELAY:
 304                 case -EKEYEXPIRED:
 305                         ret = nfs4_delay(server->client, &exception->timeout);
 306                         if (ret != 0)
 307                                 break;
 308                 case -NFS4ERR_RETRY_UNCACHED_REP:
 309                 case -NFS4ERR_OLD_STATEID:
 310                         exception->retry = 1;
 311                         break;
 312                 case -NFS4ERR_BADOWNER:
 313                         /* The following works around a Linux server bug! */
 314                 case -NFS4ERR_BADNAME:
 315                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 316                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 317                                 exception->retry = 1;
 318                                 printk(KERN_WARNING "NFS: v4 server %s "
 319                                                 "does not accept raw "
 320                                                 "uid/gids. "
 321                                                 "Reenabling the idmapper.\n",
 322                                                 server->nfs_client->cl_hostname);
 323                         }
 324         }
 325         /* We failed to handle the error */
 326         return nfs4_map_errors(ret);
 327 wait_on_recovery:
 328         ret = nfs4_wait_clnt_recover(clp);
 329         if (ret == 0)
 330                 exception->retry = 1;
 331         return ret;
 332 }
 333
 334
 335 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 336 {
 337         spin_lock(&clp->cl_lock);
 338         if (time_before(clp->cl_last_renewal,timestamp))
 339                 clp->cl_last_renewal = timestamp;
 340         spin_unlock(&clp->cl_lock);
 341 }
 342
 343 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 344 {
 345         do_renew_lease(server->nfs_client, timestamp);
 346 }
 347
 348 #if defined(CONFIG_NFS_V4_1)
 349
 350 /*
 351  * nfs4_free_slot - free a slot and efficiently update slot table.
 352  *
 353  * freeing a slot is trivially done by clearing its respective bit
 354  * in the bitmap.
 355  * If the freed slotid equals highest_used_slotid we want to update it
 356  * so that the server would be able to size down the slot table if needed,
 357  * otherwise we know that the highest_used_slotid is still in use.
 358  * When updating highest_used_slotid there may be "holes" in the bitmap
 359  * so we need to scan down from highest_used_slotid to 0 looking for the now
 360  * highest slotid in use.
 361  * If none found, highest_used_slotid is set to -1.
 362  *
 363  * Must be called while holding tbl->slot_tbl_lock
 364  */
 365 static void
 366 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 367 {
 368         int free_slotid = free_slot - tbl->slots;
 369         int slotid = free_slotid;
 370
 371         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 372         /* clear used bit in bitmap */
 373         __clear_bit(slotid, tbl->used_slots);
 374
 375         /* update highest_used_slotid when it is freed */
 376         if (slotid == tbl->highest_used_slotid) {
 377                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 378                 if (slotid < tbl->max_slots)
 379                         tbl->highest_used_slotid = slotid;
 380                 else
 381                         tbl->highest_used_slotid = -1;
 382         }
 383         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 384                 free_slotid, tbl->highest_used_slotid);
 385 }
 386
 387 /*
 388  * Signal state manager thread if session fore channel is drained
 389  */
 390 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 391 {
 392         struct rpc_task *task;
 393
 394         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 395                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 396                 if (task)
 397                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 398                 return;
 399         }
 400
 401         if (ses->fc_slot_table.highest_used_slotid != -1)
 402                 return;
 403
 404         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 405         complete(&ses->fc_slot_table.complete);
 406 }
 407
 408 /*
 409  * Signal state manager thread if session back channel is drained
 410  */
 411 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 412 {
 413         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 414             ses->bc_slot_table.highest_used_slotid != -1)
 415                 return;
 416         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 417         complete(&ses->bc_slot_table.complete);
 418 }
 419
 420 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 421 {
 422         struct nfs4_slot_table *tbl;
 423
 424         tbl = &res->sr_session->fc_slot_table;
 425         if (!res->sr_slot) {
 426                 /* just wake up the next guy waiting since
 427                  * we may have not consumed a slot after all */
 428                 dprintk("%s: No slot\n", __func__);
 429                 return;
 430         }
 431
 432         spin_lock(&tbl->slot_tbl_lock);
 433         nfs4_free_slot(tbl, res->sr_slot);
 434         nfs4_check_drain_fc_complete(res->sr_session);
 435         spin_unlock(&tbl->slot_tbl_lock);
 436         res->sr_slot = NULL;
 437 }
 438
 439 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 440 {
 441         unsigned long timestamp;
 442         struct nfs_client *clp;
 443
 444         /*
 445          * sr_status remains 1 if an RPC level error occurred. The server
 446          * may or may not have processed the sequence operation..
 447          * Proceed as if the server received and processed the sequence
 448          * operation.
 449          */
 450         if (res->sr_status == 1)
 451                 res->sr_status = NFS_OK;
 452
 453         /* don't increment the sequence number if the task wasn't sent */
 454         if (!RPC_WAS_SENT(task))
 455                 goto out;
 456
 457         /* Check the SEQUENCE operation status */
 458         switch (res->sr_status) {
 459         case 0:
 460                 /* Update the slot's sequence and clientid lease timer */
 461                 ++res->sr_slot->seq_nr;
 462                 timestamp = res->sr_renewal_time;
 463                 clp = res->sr_session->clp;
 464                 do_renew_lease(clp, timestamp);
 465                 /* Check sequence flags */
 466                 if (res->sr_status_flags != 0)
 467                         nfs4_schedule_lease_recovery(clp);
 468                 break;
 469         case -NFS4ERR_DELAY:
 470                 /* The server detected a resend of the RPC call and
 471                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 472                  * of RFC5661.
 473                  */
 474                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 475                         __func__,
 476                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 477                         res->sr_slot->seq_nr);
 478                 goto out_retry;
 479         default:
 480                 /* Just update the slot sequence no. */
 481                 ++res->sr_slot->seq_nr;
 482         }
 483 out:
 484         /* The session may be reset by one of the error handlers. */
 485         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 486         nfs41_sequence_free_slot(res);
 487         return 1;
 488 out_retry:
 489         if (!rpc_restart_call(task))
 490                 goto out;
 491         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 492         return 0;
 493 }
 494
 495 static int nfs4_sequence_done(struct rpc_task *task,
 496                                struct nfs4_sequence_res *res)
 497 {
 498         if (res->sr_session == NULL)
 499                 return 1;
 500         return nfs41_sequence_done(task, res);
 501 }
 502
 503 /*
 504  * nfs4_find_slot - efficiently look for a free slot
 505  *
 506  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 507  * If found, we mark the slot as used, update the highest_used_slotid,
 508  * and respectively set up the sequence operation args.
 509  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 510  *
 511  * Note: must be called with under the slot_tbl_lock.
 512  */
 513 static u8
 514 nfs4_find_slot(struct nfs4_slot_table *tbl)
 515 {
 516         int slotid;
 517         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 518         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 519
 520         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 521                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 522                 tbl->max_slots);
 523         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 524         if (slotid >= tbl->max_slots)
 525                 goto out;
 526         __set_bit(slotid, tbl->used_slots);
 527         if (slotid > tbl->highest_used_slotid)
 528                 tbl->highest_used_slotid = slotid;
 529         ret_id = slotid;
 530 out:
 531         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 532                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 533         return ret_id;
 534 }
 535
 536 int nfs41_setup_sequence(struct nfs4_session *session,
 537                                 struct nfs4_sequence_args *args,
 538                                 struct nfs4_sequence_res *res,
 539                                 int cache_reply,
 540                                 struct rpc_task *task)
 541 {
 542         struct nfs4_slot *slot;
 543         struct nfs4_slot_table *tbl;
 544         u8 slotid;
 545
 546         dprintk("--> %s\n", __func__);
 547         /* slot already allocated? */
 548         if (res->sr_slot != NULL)
 549                 return 0;
 550
 551         tbl = &session->fc_slot_table;
 552
 553         spin_lock(&tbl->slot_tbl_lock);
 554         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 555             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 556                 /*
 557                  * The state manager will wait until the slot table is empty.
 558                  * Schedule the reset thread
 559                  */
 560                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 561                 spin_unlock(&tbl->slot_tbl_lock);
 562                 dprintk("%s Schedule Session Reset\n", __func__);
 563                 return -EAGAIN;
 564         }
 565
 566         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 567             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 568                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 569                 spin_unlock(&tbl->slot_tbl_lock);
 570                 dprintk("%s enforce FIFO order\n", __func__);
 571                 return -EAGAIN;
 572         }
 573
 574         slotid = nfs4_find_slot(tbl);
 575         if (slotid == NFS4_MAX_SLOT_TABLE) {
 576                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 577                 spin_unlock(&tbl->slot_tbl_lock);
 578                 dprintk("<-- %s: no free slots\n", __func__);
 579                 return -EAGAIN;
 580         }
 581         spin_unlock(&tbl->slot_tbl_lock);
 582
 583         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 584         slot = tbl->slots + slotid;
 585         args->sa_session = session;
 586         args->sa_slotid = slotid;
 587         args->sa_cache_this = cache_reply;
 588
 589         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 590
 591         res->sr_session = session;
 592         res->sr_slot = slot;
 593         res->sr_renewal_time = jiffies;
 594         res->sr_status_flags = 0;
 595         /*
 596          * sr_status is only set in decode_sequence, and so will remain
 597          * set to 1 if an rpc level failure occurs.
 598          */
 599         res->sr_status = 1;
 600         return 0;
 601 }
 602 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 603
 604 int nfs4_setup_sequence(const struct nfs_server *server,
 605                         struct nfs4_sequence_args *args,
 606                         struct nfs4_sequence_res *res,
 607                         int cache_reply,
 608                         struct rpc_task *task)
 609 {
 610         struct nfs4_session *session = nfs4_get_session(server);
 611         int ret = 0;
 612
 613         if (session == NULL) {
 614                 args->sa_session = NULL;
 615                 res->sr_session = NULL;
 616                 goto out;
 617         }
 618
 619         dprintk("--> %s clp %p session %p sr_slot %td\n",
 620                 __func__, session->clp, session, res->sr_slot ?
 621                         res->sr_slot - session->fc_slot_table.slots : -1);
 622
 623         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 624                                    task);
 625 out:
 626         dprintk("<-- %s status=%d\n", __func__, ret);
 627         return ret;
 628 }
 629
 630 struct nfs41_call_sync_data {
 631         const struct nfs_server *seq_server;
 632         struct nfs4_sequence_args *seq_args;
 633         struct nfs4_sequence_res *seq_res;
 634         int cache_reply;
 635 };
 636
 637 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 638 {
 639         struct nfs41_call_sync_data *data = calldata;
 640
 641         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 642
 643         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 644                                 data->seq_res, data->cache_reply, task))
 645                 return;
 646         rpc_call_start(task);
 647 }
 648
 649 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 650 {
 651         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 652         nfs41_call_sync_prepare(task, calldata);
 653 }
 654
 655 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 656 {
 657         struct nfs41_call_sync_data *data = calldata;
 658
 659         nfs41_sequence_done(task, data->seq_res);
 660 }
 661
 662 struct rpc_call_ops nfs41_call_sync_ops = {
 663         .rpc_call_prepare = nfs41_call_sync_prepare,
 664         .rpc_call_done = nfs41_call_sync_done,
 665 };
 666
 667 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 668         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 669         .rpc_call_done = nfs41_call_sync_done,
 670 };
 671
 672 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 673                                    struct nfs_server *server,
 674                                    struct rpc_message *msg,
 675                                    struct nfs4_sequence_args *args,
 676                                    struct nfs4_sequence_res *res,
 677                                    int cache_reply,
 678                                    int privileged)
 679 {
 680         int ret;
 681         struct rpc_task *task;
 682         struct nfs41_call_sync_data data = {
 683                 .seq_server = server,
 684                 .seq_args = args,
 685                 .seq_res = res,
 686                 .cache_reply = cache_reply,
 687         };
 688         struct rpc_task_setup task_setup = {
 689                 .rpc_client = clnt,
 690                 .rpc_message = msg,
 691                 .callback_ops = &nfs41_call_sync_ops,
 692                 .callback_data = &data
 693         };
 694
 695         res->sr_slot = NULL;
 696         if (privileged)
 697                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 698         task = rpc_run_task(&task_setup);
 699         if (IS_ERR(task))
 700                 ret = PTR_ERR(task);
 701         else {
 702                 ret = task->tk_status;
 703                 rpc_put_task(task);
 704         }
 705         return ret;
 706 }
 707
 708 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 709                             struct nfs_server *server,
 710                             struct rpc_message *msg,
 711                             struct nfs4_sequence_args *args,
 712                             struct nfs4_sequence_res *res,
 713                             int cache_reply)
 714 {
 715         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 716 }
 717
 718 #else
 719 static int nfs4_sequence_done(struct rpc_task *task,
 720                                struct nfs4_sequence_res *res)
 721 {
 722         return 1;
 723 }
 724 #endif /* CONFIG_NFS_V4_1 */
 725
 726 int _nfs4_call_sync(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         args->sa_session = res->sr_session = NULL;
 734         return rpc_call_sync(clnt, msg, 0);
 735 }
 736
 737 static inline
 738 int nfs4_call_sync(struct rpc_clnt *clnt,
 739                    struct nfs_server *server,
 740                    struct rpc_message *msg,
 741                    struct nfs4_sequence_args *args,
 742                    struct nfs4_sequence_res *res,
 743                    int cache_reply)
 744 {
 745         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 746                                                 args, res, cache_reply);
 747 }
 748
 749 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 750 {
 751         struct nfs_inode *nfsi = NFS_I(dir);
 752
 753         spin_lock(&dir->i_lock);
 754         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 755         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 756                 nfs_force_lookup_revalidate(dir);
 757         nfsi->change_attr = cinfo->after;
 758         spin_unlock(&dir->i_lock);
 759 }
 760
 761 struct nfs4_opendata {
 762         struct kref kref;
 763         struct nfs_openargs o_arg;
 764         struct nfs_openres o_res;
 765         struct nfs_open_confirmargs c_arg;
 766         struct nfs_open_confirmres c_res;
 767         struct nfs_fattr f_attr;
 768         struct nfs_fattr dir_attr;
 769         struct path path;
 770         struct dentry *dir;
 771         struct nfs4_state_owner *owner;
 772         struct nfs4_state *state;
 773         struct iattr attrs;
 774         unsigned long timestamp;
 775         unsigned int rpc_done : 1;
 776         int rpc_status;
 777         int cancelled;
 778 };
 779
 780
 781 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 782 {
 783         p->o_res.f_attr = &p->f_attr;
 784         p->o_res.dir_attr = &p->dir_attr;
 785         p->o_res.seqid = p->o_arg.seqid;
 786         p->c_res.seqid = p->c_arg.seqid;
 787         p->o_res.server = p->o_arg.server;
 788         nfs_fattr_init(&p->f_attr);
 789         nfs_fattr_init(&p->dir_attr);
 790 }
 791
 792 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 793                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 794                 const struct iattr *attrs,
 795                 gfp_t gfp_mask)
 796 {
 797         struct dentry *parent = dget_parent(path->dentry);
 798         struct inode *dir = parent->d_inode;
 799         struct nfs_server *server = NFS_SERVER(dir);
 800         struct nfs4_opendata *p;
 801
 802         p = kzalloc(sizeof(*p), gfp_mask);
 803         if (p == NULL)
 804                 goto err;
 805         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 806         if (p->o_arg.seqid == NULL)
 807                 goto err_free;
 808         path_get(path);
 809         p->path = *path;
 810         p->dir = parent;
 811         p->owner = sp;
 812         atomic_inc(&sp->so_count);
 813         p->o_arg.fh = NFS_FH(dir);
 814         p->o_arg.open_flags = flags;
 815         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 816         p->o_arg.clientid = server->nfs_client->cl_clientid;
 817         p->o_arg.id = sp->so_owner_id.id;
 818         p->o_arg.name = &p->path.dentry->d_name;
 819         p->o_arg.server = server;
 820         p->o_arg.bitmask = server->attr_bitmask;
 821         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 822         if (flags & O_CREAT) {
 823                 u32 *s;
 824
 825                 p->o_arg.u.attrs = &p->attrs;
 826                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 827                 s = (u32 *) p->o_arg.u.verifier.data;
 828                 s[0] = jiffies;
 829                 s[1] = current->pid;
 830         }
 831         p->c_arg.fh = &p->o_res.fh;
 832         p->c_arg.stateid = &p->o_res.stateid;
 833         p->c_arg.seqid = p->o_arg.seqid;
 834         nfs4_init_opendata_res(p);
 835         kref_init(&p->kref);
 836         return p;
 837 err_free:
 838         kfree(p);
 839 err:
 840         dput(parent);
 841         return NULL;
 842 }
 843
 844 static void nfs4_opendata_free(struct kref *kref)
 845 {
 846         struct nfs4_opendata *p = container_of(kref,
 847                         struct nfs4_opendata, kref);
 848
 849         nfs_free_seqid(p->o_arg.seqid);
 850         if (p->state != NULL)
 851                 nfs4_put_open_state(p->state);
 852         nfs4_put_state_owner(p->owner);
 853         dput(p->dir);
 854         path_put(&p->path);
 855         kfree(p);
 856 }
 857
 858 static void nfs4_opendata_put(struct nfs4_opendata *p)
 859 {
 860         if (p != NULL)
 861                 kref_put(&p->kref, nfs4_opendata_free);
 862 }
 863
 864 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 865 {
 866         int ret;
 867
 868         ret = rpc_wait_for_completion_task(task);
 869         return ret;
 870 }
 871
 872 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 873 {
 874         int ret = 0;
 875
 876         if (open_mode & O_EXCL)
 877                 goto out;
 878         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 879                 case FMODE_READ:
 880                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 881                                 && state->n_rdonly != 0;
 882                         break;
 883                 case FMODE_WRITE:
 884                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 885                                 && state->n_wronly != 0;
 886                         break;
 887                 case FMODE_READ|FMODE_WRITE:
 888                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 889                                 && state->n_rdwr != 0;
 890         }
 891 out:
 892         return ret;
 893 }
 894
 895 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 896 {
 897         if ((delegation->type & fmode) != fmode)
 898                 return 0;
 899         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 900                 return 0;
 901         nfs_mark_delegation_referenced(delegation);
 902         return 1;
 903 }
 904
 905 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 906 {
 907         switch (fmode) {
 908                 case FMODE_WRITE:
 909                         state->n_wronly++;
 910                         break;
 911                 case FMODE_READ:
 912                         state->n_rdonly++;
 913                         break;
 914                 case FMODE_READ|FMODE_WRITE:
 915                         state->n_rdwr++;
 916         }
 917         nfs4_state_set_mode_locked(state, state->state | fmode);
 918 }
 919
 920 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 921 {
 922         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 923                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 924         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 925         switch (fmode) {
 926                 case FMODE_READ:
 927                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 928                         break;
 929                 case FMODE_WRITE:
 930                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 931                         break;
 932                 case FMODE_READ|FMODE_WRITE:
 933                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 934         }
 935 }
 936
 937 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 938 {
 939         write_seqlock(&state->seqlock);
 940         nfs_set_open_stateid_locked(state, stateid, fmode);
 941         write_sequnlock(&state->seqlock);
 942 }
 943
 944 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 945 {
 946         /*
 947          * Protect the call to nfs4_state_set_mode_locked and
 948          * serialise the stateid update
 949          */
 950         write_seqlock(&state->seqlock);
 951         if (deleg_stateid != NULL) {
 952                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 953                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 954         }
 955         if (open_stateid != NULL)
 956                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 957         write_sequnlock(&state->seqlock);
 958         spin_lock(&state->owner->so_lock);
 959         update_open_stateflags(state, fmode);
 960         spin_unlock(&state->owner->so_lock);
 961 }
 962
 963 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 964 {
 965         struct nfs_inode *nfsi = NFS_I(state->inode);
 966         struct nfs_delegation *deleg_cur;
 967         int ret = 0;
 968
 969         fmode &= (FMODE_READ|FMODE_WRITE);
 970
 971         rcu_read_lock();
 972         deleg_cur = rcu_dereference(nfsi->delegation);
 973         if (deleg_cur == NULL)
 974                 goto no_delegation;
 975
 976         spin_lock(&deleg_cur->lock);
 977         if (nfsi->delegation != deleg_cur ||
 978             (deleg_cur->type & fmode) != fmode)
 979                 goto no_delegation_unlock;
 980
 981         if (delegation == NULL)
 982                 delegation = &deleg_cur->stateid;
 983         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 984                 goto no_delegation_unlock;
 985
 986         nfs_mark_delegation_referenced(deleg_cur);
 987         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 988         ret = 1;
 989 no_delegation_unlock:
 990         spin_unlock(&deleg_cur->lock);
 991 no_delegation:
 992         rcu_read_unlock();
 993
 994         if (!ret && open_stateid != NULL) {
 995                 __update_open_stateid(state, open_stateid, NULL, fmode);
 996                 ret = 1;
 997         }
 998
 999         return ret;
1000 }
1001
1002
1003 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1004 {
1005         struct nfs_delegation *delegation;
1006
1007         rcu_read_lock();
1008         delegation = rcu_dereference(NFS_I(inode)->delegation);
1009         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1010                 rcu_read_unlock();
1011                 return;
1012         }
1013         rcu_read_unlock();
1014         nfs_inode_return_delegation(inode);
1015 }
1016
1017 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1018 {
1019         struct nfs4_state *state = opendata->state;
1020         struct nfs_inode *nfsi = NFS_I(state->inode);
1021         struct nfs_delegation *delegation;
1022         int open_mode = opendata->o_arg.open_flags & O_EXCL;
1023         fmode_t fmode = opendata->o_arg.fmode;
1024         nfs4_stateid stateid;
1025         int ret = -EAGAIN;
1026
1027         for (;;) {
1028                 if (can_open_cached(state, fmode, open_mode)) {
1029                         spin_lock(&state->owner->so_lock);
1030                         if (can_open_cached(state, fmode, open_mode)) {
1031                                 update_open_stateflags(state, fmode);
1032                                 spin_unlock(&state->owner->so_lock);
1033                                 goto out_return_state;
1034                         }
1035                         spin_unlock(&state->owner->so_lock);
1036                 }
1037                 rcu_read_lock();
1038                 delegation = rcu_dereference(nfsi->delegation);
1039                 if (delegation == NULL ||
1040                     !can_open_delegated(delegation, fmode)) {
1041                         rcu_read_unlock();
1042                         break;
1043                 }
1044                 /* Save the delegation */
1045                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1046                 rcu_read_unlock();
1047                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1048                 if (ret != 0)
1049                         goto out;
1050                 ret = -EAGAIN;
1051
1052                 /* Try to update the stateid using the delegation */
1053                 if (update_open_stateid(state, NULL, &stateid, fmode))
1054                         goto out_return_state;
1055         }
1056 out:
1057         return ERR_PTR(ret);
1058 out_return_state:
1059         atomic_inc(&state->count);
1060         return state;
1061 }
1062
1063 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1064 {
1065         struct inode *inode;
1066         struct nfs4_state *state = NULL;
1067         struct nfs_delegation *delegation;
1068         int ret;
1069
1070         if (!data->rpc_done) {
1071                 state = nfs4_try_open_cached(data);
1072                 goto out;
1073         }
1074
1075         ret = -EAGAIN;
1076         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1077                 goto err;
1078         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1079         ret = PTR_ERR(inode);
1080         if (IS_ERR(inode))
1081                 goto err;
1082         ret = -ENOMEM;
1083         state = nfs4_get_open_state(inode, data->owner);
1084         if (state == NULL)
1085                 goto err_put_inode;
1086         if (data->o_res.delegation_type != 0) {
1087                 int delegation_flags = 0;
1088
1089                 rcu_read_lock();
1090                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1091                 if (delegation)
1092                         delegation_flags = delegation->flags;
1093                 rcu_read_unlock();
1094                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1095                         nfs_inode_set_delegation(state->inode,
1096                                         data->owner->so_cred,
1097                                         &data->o_res);
1098                 else
1099                         nfs_inode_reclaim_delegation(state->inode,
1100                                         data->owner->so_cred,
1101                                         &data->o_res);
1102         }
1103
1104         update_open_stateid(state, &data->o_res.stateid, NULL,
1105                         data->o_arg.fmode);
1106         iput(inode);
1107 out:
1108         return state;
1109 err_put_inode:
1110         iput(inode);
1111 err:
1112         return ERR_PTR(ret);
1113 }
1114
1115 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1116 {
1117         struct nfs_inode *nfsi = NFS_I(state->inode);
1118         struct nfs_open_context *ctx;
1119
1120         spin_lock(&state->inode->i_lock);
1121         list_for_each_entry(ctx, &nfsi->open_files, list) {
1122                 if (ctx->state != state)
1123                         continue;
1124                 get_nfs_open_context(ctx);
1125                 spin_unlock(&state->inode->i_lock);
1126                 return ctx;
1127         }
1128         spin_unlock(&state->inode->i_lock);
1129         return ERR_PTR(-ENOENT);
1130 }
1131
1132 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1133 {
1134         struct nfs4_opendata *opendata;
1135
1136         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1137         if (opendata == NULL)
1138                 return ERR_PTR(-ENOMEM);
1139         opendata->state = state;
1140         atomic_inc(&state->count);
1141         return opendata;
1142 }
1143
1144 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1145 {
1146         struct nfs4_state *newstate;
1147         int ret;
1148
1149         opendata->o_arg.open_flags = 0;
1150         opendata->o_arg.fmode = fmode;
1151         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1152         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1153         nfs4_init_opendata_res(opendata);
1154         ret = _nfs4_recover_proc_open(opendata);
1155         if (ret != 0)
1156                 return ret;
1157         newstate = nfs4_opendata_to_nfs4_state(opendata);
1158         if (IS_ERR(newstate))
1159                 return PTR_ERR(newstate);
1160         nfs4_close_state(&opendata->path, newstate, fmode);
1161         *res = newstate;
1162         return 0;
1163 }
1164
1165 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1166 {
1167         struct nfs4_state *newstate;
1168         int ret;
1169
1170         /* memory barrier prior to reading state->n_* */
1171         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1172         smp_rmb();
1173         if (state->n_rdwr != 0) {
1174                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1175                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1176                 if (ret != 0)
1177                         return ret;
1178                 if (newstate != state)
1179                         return -ESTALE;
1180         }
1181         if (state->n_wronly != 0) {
1182                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1183                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1184                 if (ret != 0)
1185                         return ret;
1186                 if (newstate != state)
1187                         return -ESTALE;
1188         }
1189         if (state->n_rdonly != 0) {
1190                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1191                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1192                 if (ret != 0)
1193                         return ret;
1194                 if (newstate != state)
1195                         return -ESTALE;
1196         }
1197         /*
1198          * We may have performed cached opens for all three recoveries.
1199          * Check if we need to update the current stateid.
1200          */
1201         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1202             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1203                 write_seqlock(&state->seqlock);
1204                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1205                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1206                 write_sequnlock(&state->seqlock);
1207         }
1208         return 0;
1209 }
1210
1211 /*
1212  * OPEN_RECLAIM:
1213  *      reclaim state on the server after a reboot.
1214  */
1215 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1216 {
1217         struct nfs_delegation *delegation;
1218         struct nfs4_opendata *opendata;
1219         fmode_t delegation_type = 0;
1220         int status;
1221
1222         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1223         if (IS_ERR(opendata))
1224                 return PTR_ERR(opendata);
1225         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1226         opendata->o_arg.fh = NFS_FH(state->inode);
1227         rcu_read_lock();
1228         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1229         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1230                 delegation_type = delegation->type;
1231         rcu_read_unlock();
1232         opendata->o_arg.u.delegation_type = delegation_type;
1233         status = nfs4_open_recover(opendata, state);
1234         nfs4_opendata_put(opendata);
1235         return status;
1236 }
1237
1238 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1239 {
1240         struct nfs_server *server = NFS_SERVER(state->inode);
1241         struct nfs4_exception exception = { };
1242         int err;
1243         do {
1244                 err = _nfs4_do_open_reclaim(ctx, state);
1245                 if (err != -NFS4ERR_DELAY)
1246                         break;
1247                 nfs4_handle_exception(server, err, &exception);
1248         } while (exception.retry);
1249         return err;
1250 }
1251
1252 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1253 {
1254         struct nfs_open_context *ctx;
1255         int ret;
1256
1257         ctx = nfs4_state_find_open_context(state);
1258         if (IS_ERR(ctx))
1259                 return PTR_ERR(ctx);
1260         ret = nfs4_do_open_reclaim(ctx, state);
1261         put_nfs_open_context(ctx);
1262         return ret;
1263 }
1264
1265 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1266 {
1267         struct nfs4_opendata *opendata;
1268         int ret;
1269
1270         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1271         if (IS_ERR(opendata))
1272                 return PTR_ERR(opendata);
1273         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1274         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1275                         sizeof(opendata->o_arg.u.delegation.data));
1276         ret = nfs4_open_recover(opendata, state);
1277         nfs4_opendata_put(opendata);
1278         return ret;
1279 }
1280
1281 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1282 {
1283         struct nfs4_exception exception = { };
1284         struct nfs_server *server = NFS_SERVER(state->inode);
1285         int err;
1286         do {
1287                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1288                 switch (err) {
1289                         case 0:
1290                         case -ENOENT:
1291                         case -ESTALE:
1292                                 goto out;
1293                         case -NFS4ERR_BADSESSION:
1294                         case -NFS4ERR_BADSLOT:
1295                         case -NFS4ERR_BAD_HIGH_SLOT:
1296                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1297                         case -NFS4ERR_DEADSESSION:
1298                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1299                                 goto out;
1300                         case -NFS4ERR_STALE_CLIENTID:
1301                         case -NFS4ERR_STALE_STATEID:
1302                         case -NFS4ERR_EXPIRED:
1303                                 /* Don't recall a delegation if it was lost */
1304                                 nfs4_schedule_lease_recovery(server->nfs_client);
1305                                 goto out;
1306                         case -ERESTARTSYS:
1307                                 /*
1308                                  * The show must go on: exit, but mark the
1309                                  * stateid as needing recovery.
1310                                  */
1311                         case -NFS4ERR_ADMIN_REVOKED:
1312                         case -NFS4ERR_BAD_STATEID:
1313                                 nfs4_schedule_stateid_recovery(server, state);
1314                         case -EKEYEXPIRED:
1315                                 /*
1316                                  * User RPCSEC_GSS context has expired.
1317                                  * We cannot recover this stateid now, so
1318                                  * skip it and allow recovery thread to
1319                                  * proceed.
1320                                  */
1321                         case -ENOMEM:
1322                                 err = 0;
1323                                 goto out;
1324                 }
1325                 err = nfs4_handle_exception(server, err, &exception);
1326         } while (exception.retry);
1327 out:
1328         return err;
1329 }
1330
1331 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1332 {
1333         struct nfs4_opendata *data = calldata;
1334
1335         data->rpc_status = task->tk_status;
1336         if (data->rpc_status == 0) {
1337                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1338                                 sizeof(data->o_res.stateid.data));
1339                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1340                 renew_lease(data->o_res.server, data->timestamp);
1341                 data->rpc_done = 1;
1342         }
1343 }
1344
1345 static void nfs4_open_confirm_release(void *calldata)
1346 {
1347         struct nfs4_opendata *data = calldata;
1348         struct nfs4_state *state = NULL;
1349
1350         /* If this request hasn't been cancelled, do nothing */
1351         if (data->cancelled == 0)
1352                 goto out_free;
1353         /* In case of error, no cleanup! */
1354         if (!data->rpc_done)
1355                 goto out_free;
1356         state = nfs4_opendata_to_nfs4_state(data);
1357         if (!IS_ERR(state))
1358                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1359 out_free:
1360         nfs4_opendata_put(data);
1361 }
1362
1363 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1364         .rpc_call_done = nfs4_open_confirm_done,
1365         .rpc_release = nfs4_open_confirm_release,
1366 };
1367
1368 /*
1369  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1370  */
1371 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1372 {
1373         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1374         struct rpc_task *task;
1375         struct  rpc_message msg = {
1376                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1377                 .rpc_argp = &data->c_arg,
1378                 .rpc_resp = &data->c_res,
1379                 .rpc_cred = data->owner->so_cred,
1380         };
1381         struct rpc_task_setup task_setup_data = {
1382                 .rpc_client = server->client,
1383                 .rpc_message = &msg,
1384                 .callback_ops = &nfs4_open_confirm_ops,
1385                 .callback_data = data,
1386                 .workqueue = nfsiod_workqueue,
1387                 .flags = RPC_TASK_ASYNC,
1388         };
1389         int status;
1390
1391         kref_get(&data->kref);
1392         data->rpc_done = 0;
1393         data->rpc_status = 0;
1394         data->timestamp = jiffies;
1395         task = rpc_run_task(&task_setup_data);
1396         if (IS_ERR(task))
1397                 return PTR_ERR(task);
1398         status = nfs4_wait_for_completion_rpc_task(task);
1399         if (status != 0) {
1400                 data->cancelled = 1;
1401                 smp_wmb();
1402         } else
1403                 status = data->rpc_status;
1404         rpc_put_task(task);
1405         return status;
1406 }
1407
1408 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1409 {
1410         struct nfs4_opendata *data = calldata;
1411         struct nfs4_state_owner *sp = data->owner;
1412
1413         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1414                 return;
1415         /*
1416          * Check if we still need to send an OPEN call, or if we can use
1417          * a delegation instead.
1418          */
1419         if (data->state != NULL) {
1420                 struct nfs_delegation *delegation;
1421
1422                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1423                         goto out_no_action;
1424                 rcu_read_lock();
1425                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1426                 if (delegation != NULL &&
1427                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1428                         rcu_read_unlock();
1429                         goto out_no_action;
1430                 }
1431                 rcu_read_unlock();
1432         }
1433         /* Update sequence id. */
1434         data->o_arg.id = sp->so_owner_id.id;
1435         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1436         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1437                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1438                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1439         }
1440         data->timestamp = jiffies;
1441         if (nfs4_setup_sequence(data->o_arg.server,
1442                                 &data->o_arg.seq_args,
1443                                 &data->o_res.seq_res, 1, task))
1444                 return;
1445         rpc_call_start(task);
1446         return;
1447 out_no_action:
1448         task->tk_action = NULL;
1449
1450 }
1451
1452 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1453 {
1454         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1455         nfs4_open_prepare(task, calldata);
1456 }
1457
1458 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1459 {
1460         struct nfs4_opendata *data = calldata;
1461
1462         data->rpc_status = task->tk_status;
1463
1464         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1465                 return;
1466
1467         if (task->tk_status == 0) {
1468                 switch (data->o_res.f_attr->mode & S_IFMT) {
1469                         case S_IFREG:
1470                                 break;
1471                         case S_IFLNK:
1472                                 data->rpc_status = -ELOOP;
1473                                 break;
1474                         case S_IFDIR:
1475                                 data->rpc_status = -EISDIR;
1476                                 break;
1477                         default:
1478                                 data->rpc_status = -ENOTDIR;
1479                 }
1480                 renew_lease(data->o_res.server, data->timestamp);
1481                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1482                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1483         }
1484         data->rpc_done = 1;
1485 }
1486
1487 static void nfs4_open_release(void *calldata)
1488 {
1489         struct nfs4_opendata *data = calldata;
1490         struct nfs4_state *state = NULL;
1491
1492         /* If this request hasn't been cancelled, do nothing */
1493         if (data->cancelled == 0)
1494                 goto out_free;
1495         /* In case of error, no cleanup! */
1496         if (data->rpc_status != 0 || !data->rpc_done)
1497                 goto out_free;
1498         /* In case we need an open_confirm, no cleanup! */
1499         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1500                 goto out_free;
1501         state = nfs4_opendata_to_nfs4_state(data);
1502         if (!IS_ERR(state))
1503                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1504 out_free:
1505         nfs4_opendata_put(data);
1506 }
1507
1508 static const struct rpc_call_ops nfs4_open_ops = {
1509         .rpc_call_prepare = nfs4_open_prepare,
1510         .rpc_call_done = nfs4_open_done,
1511         .rpc_release = nfs4_open_release,
1512 };
1513
1514 static const struct rpc_call_ops nfs4_recover_open_ops = {
1515         .rpc_call_prepare = nfs4_recover_open_prepare,
1516         .rpc_call_done = nfs4_open_done,
1517         .rpc_release = nfs4_open_release,
1518 };
1519
1520 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1521 {
1522         struct inode *dir = data->dir->d_inode;
1523         struct nfs_server *server = NFS_SERVER(dir);
1524         struct nfs_openargs *o_arg = &data->o_arg;
1525         struct nfs_openres *o_res = &data->o_res;
1526         struct rpc_task *task;
1527         struct rpc_message msg = {
1528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1529                 .rpc_argp = o_arg,
1530                 .rpc_resp = o_res,
1531                 .rpc_cred = data->owner->so_cred,
1532         };
1533         struct rpc_task_setup task_setup_data = {
1534                 .rpc_client = server->client,
1535                 .rpc_message = &msg,
1536                 .callback_ops = &nfs4_open_ops,
1537                 .callback_data = data,
1538                 .workqueue = nfsiod_workqueue,
1539                 .flags = RPC_TASK_ASYNC,
1540         };
1541         int status;
1542
1543         kref_get(&data->kref);
1544         data->rpc_done = 0;
1545         data->rpc_status = 0;
1546         data->cancelled = 0;
1547         if (isrecover)
1548                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1549         task = rpc_run_task(&task_setup_data);
1550         if (IS_ERR(task))
1551                 return PTR_ERR(task);
1552         status = nfs4_wait_for_completion_rpc_task(task);
1553         if (status != 0) {
1554                 data->cancelled = 1;
1555                 smp_wmb();
1556         } else
1557                 status = data->rpc_status;
1558         rpc_put_task(task);
1559
1560         return status;
1561 }
1562
1563 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1564 {
1565         struct inode *dir = data->dir->d_inode;
1566         struct nfs_openres *o_res = &data->o_res;
1567         int status;
1568
1569         status = nfs4_run_open_task(data, 1);
1570         if (status != 0 || !data->rpc_done)
1571                 return status;
1572
1573         nfs_refresh_inode(dir, o_res->dir_attr);
1574
1575         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1576                 status = _nfs4_proc_open_confirm(data);
1577                 if (status != 0)
1578                         return status;
1579         }
1580
1581         return status;
1582 }
1583
1584 /*
1585  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1586  */
1587 static int _nfs4_proc_open(struct nfs4_opendata *data)
1588 {
1589         struct inode *dir = data->dir->d_inode;
1590         struct nfs_server *server = NFS_SERVER(dir);
1591         struct nfs_openargs *o_arg = &data->o_arg;
1592         struct nfs_openres *o_res = &data->o_res;
1593         int status;
1594
1595         status = nfs4_run_open_task(data, 0);
1596         if (status != 0 || !data->rpc_done)
1597                 return status;
1598
1599         if (o_arg->open_flags & O_CREAT) {
1600                 update_changeattr(dir, &o_res->cinfo);
1601                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1602         } else
1603                 nfs_refresh_inode(dir, o_res->dir_attr);
1604         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1605                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1606         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1607                 status = _nfs4_proc_open_confirm(data);
1608                 if (status != 0)
1609                         return status;
1610         }
1611         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1612                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1613         return 0;
1614 }
1615
1616 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1617 {
1618         unsigned int loop;
1619         int ret;
1620
1621         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1622                 ret = nfs4_wait_clnt_recover(clp);
1623                 if (ret != 0)
1624                         break;
1625                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1626                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1627                         break;
1628                 nfs4_schedule_state_manager(clp);
1629                 ret = -EIO;
1630         }
1631         return ret;
1632 }
1633
1634 static int nfs4_recover_expired_lease(struct nfs_server *server)
1635 {
1636         return nfs4_client_recover_expired_lease(server->nfs_client);
1637 }
1638
1639 /*
1640  * OPEN_EXPIRED:
1641  *      reclaim state on the server after a network partition.
1642  *      Assumes caller holds the appropriate lock
1643  */
1644 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1645 {
1646         struct nfs4_opendata *opendata;
1647         int ret;
1648
1649         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1650         if (IS_ERR(opendata))
1651                 return PTR_ERR(opendata);
1652         ret = nfs4_open_recover(opendata, state);
1653         if (ret == -ESTALE)
1654                 d_drop(ctx->path.dentry);
1655         nfs4_opendata_put(opendata);
1656         return ret;
1657 }
1658
1659 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1660 {
1661         struct nfs_server *server = NFS_SERVER(state->inode);
1662         struct nfs4_exception exception = { };
1663         int err;
1664
1665         do {
1666                 err = _nfs4_open_expired(ctx, state);
1667                 switch (err) {
1668                 default:
1669                         goto out;
1670                 case -NFS4ERR_GRACE:
1671                 case -NFS4ERR_DELAY:
1672                         nfs4_handle_exception(server, err, &exception);
1673                         err = 0;
1674                 }
1675         } while (exception.retry);
1676 out:
1677         return err;
1678 }
1679
1680 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1681 {
1682         struct nfs_open_context *ctx;
1683         int ret;
1684
1685         ctx = nfs4_state_find_open_context(state);
1686         if (IS_ERR(ctx))
1687                 return PTR_ERR(ctx);
1688         ret = nfs4_do_open_expired(ctx, state);
1689         put_nfs_open_context(ctx);
1690         return ret;
1691 }
1692
1693 #if defined(CONFIG_NFS_V4_1)
1694 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1695 {
1696         int status;
1697         struct nfs_server *server = NFS_SERVER(state->inode);
1698
1699         status = nfs41_test_stateid(server, state);
1700         if (status == NFS_OK)
1701                 return 0;
1702         nfs41_free_stateid(server, state);
1703         return nfs4_open_expired(sp, state);
1704 }
1705 #endif
1706
1707 /*
1708  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1709  * fields corresponding to attributes that were used to store the verifier.
1710  * Make sure we clobber those fields in the later setattr call
1711  */
1712 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1713 {
1714         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1715             !(sattr->ia_valid & ATTR_ATIME_SET))
1716                 sattr->ia_valid |= ATTR_ATIME;
1717
1718         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1719             !(sattr->ia_valid & ATTR_MTIME_SET))
1720                 sattr->ia_valid |= ATTR_MTIME;
1721 }
1722
1723 /*
1724  * Returns a referenced nfs4_state
1725  */
1726 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1727 {
1728         struct nfs4_state_owner  *sp;
1729         struct nfs4_state     *state = NULL;
1730         struct nfs_server       *server = NFS_SERVER(dir);
1731         struct nfs4_opendata *opendata;
1732         int status;
1733
1734         /* Protect against reboot recovery conflicts */
1735         status = -ENOMEM;
1736         if (!(sp = nfs4_get_state_owner(server, cred))) {
1737                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1738                 goto out_err;
1739         }
1740         status = nfs4_recover_expired_lease(server);
1741         if (status != 0)
1742                 goto err_put_state_owner;
1743         if (path->dentry->d_inode != NULL)
1744                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1745         status = -ENOMEM;
1746         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1747         if (opendata == NULL)
1748                 goto err_put_state_owner;
1749
1750         if (path->dentry->d_inode != NULL)
1751                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1752
1753         status = _nfs4_proc_open(opendata);
1754         if (status != 0)
1755                 goto err_opendata_put;
1756
1757         state = nfs4_opendata_to_nfs4_state(opendata);
1758         status = PTR_ERR(state);
1759         if (IS_ERR(state))
1760                 goto err_opendata_put;
1761         if (server->caps & NFS_CAP_POSIX_LOCK)
1762                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1763
1764         if (opendata->o_arg.open_flags & O_EXCL) {
1765                 nfs4_exclusive_attrset(opendata, sattr);
1766
1767                 nfs_fattr_init(opendata->o_res.f_attr);
1768                 status = nfs4_do_setattr(state->inode, cred,
1769                                 opendata->o_res.f_attr, sattr,
1770                                 state);
1771                 if (status == 0)
1772                         nfs_setattr_update_inode(state->inode, sattr);
1773                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1774         }
1775         nfs4_opendata_put(opendata);
1776         nfs4_put_state_owner(sp);
1777         *res = state;
1778         return 0;
1779 err_opendata_put:
1780         nfs4_opendata_put(opendata);
1781 err_put_state_owner:
1782         nfs4_put_state_owner(sp);
1783 out_err:
1784         *res = NULL;
1785         return status;
1786 }
1787
1788
1789 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1790 {
1791         struct nfs4_exception exception = { };
1792         struct nfs4_state *res;
1793         int status;
1794
1795         do {
1796                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1797                 if (status == 0)
1798                         break;
1799                 /* NOTE: BAD_SEQID means the server and client disagree about the
1800                  * book-keeping w.r.t. state-changing operations
1801                  * (OPEN/CLOSE/LOCK/LOCKU...)
1802                  * It is actually a sign of a bug on the client or on the server.
1803                  *
1804                  * If we receive a BAD_SEQID error in the particular case of
1805                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1806                  * have unhashed the old state_owner for us, and that we can
1807                  * therefore safely retry using a new one. We should still warn
1808                  * the user though...
1809                  */
1810                 if (status == -NFS4ERR_BAD_SEQID) {
1811                         printk(KERN_WARNING "NFS: v4 server %s "
1812                                         " returned a bad sequence-id error!\n",
1813                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1814                         exception.retry = 1;
1815                         continue;
1816                 }
1817                 /*
1818                  * BAD_STATEID on OPEN means that the server cancelled our
1819                  * state before it received the OPEN_CONFIRM.
1820                  * Recover by retrying the request as per the discussion
1821                  * on Page 181 of RFC3530.
1822                  */
1823                 if (status == -NFS4ERR_BAD_STATEID) {
1824                         exception.retry = 1;
1825                         continue;
1826                 }
1827                 if (status == -EAGAIN) {
1828                         /* We must have found a delegation */
1829                         exception.retry = 1;
1830                         continue;
1831                 }
1832                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1833                                         status, &exception));
1834         } while (exception.retry);
1835         return res;
1836 }
1837
1838 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1839                             struct nfs_fattr *fattr, struct iattr *sattr,
1840                             struct nfs4_state *state)
1841 {
1842         struct nfs_server *server = NFS_SERVER(inode);
1843         struct nfs_setattrargs  arg = {
1844                 .fh             = NFS_FH(inode),
1845                 .iap            = sattr,
1846                 .server         = server,
1847                 .bitmask = server->attr_bitmask,
1848         };
1849         struct nfs_setattrres  res = {
1850                 .fattr          = fattr,
1851                 .server         = server,
1852         };
1853         struct rpc_message msg = {
1854                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1855                 .rpc_argp       = &arg,
1856                 .rpc_resp       = &res,
1857                 .rpc_cred       = cred,
1858         };
1859         unsigned long timestamp = jiffies;
1860         int status;
1861
1862         nfs_fattr_init(fattr);
1863
1864         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1865                 /* Use that stateid */
1866         } else if (state != NULL) {
1867                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1868         } else
1869                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1870
1871         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1872         if (status == 0 && state != NULL)
1873                 renew_lease(server, timestamp);
1874         return status;
1875 }
1876
1877 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1878                            struct nfs_fattr *fattr, struct iattr *sattr,
1879                            struct nfs4_state *state)
1880 {
1881         struct nfs_server *server = NFS_SERVER(inode);
1882         struct nfs4_exception exception = { };
1883         int err;
1884         do {
1885                 err = nfs4_handle_exception(server,
1886                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1887                                 &exception);
1888         } while (exception.retry);
1889         return err;
1890 }
1891
1892 struct nfs4_closedata {
1893         struct path path;
1894         struct inode *inode;
1895         struct nfs4_state *state;
1896         struct nfs_closeargs arg;
1897         struct nfs_closeres res;
1898         struct nfs_fattr fattr;
1899         unsigned long timestamp;
1900         bool roc;
1901         u32 roc_barrier;
1902 };
1903
1904 static void nfs4_free_closedata(void *data)
1905 {
1906         struct nfs4_closedata *calldata = data;
1907         struct nfs4_state_owner *sp = calldata->state->owner;
1908
1909         if (calldata->roc)
1910                 pnfs_roc_release(calldata->state->inode);
1911         nfs4_put_open_state(calldata->state);
1912         nfs_free_seqid(calldata->arg.seqid);
1913         nfs4_put_state_owner(sp);
1914         path_put(&calldata->path);
1915         kfree(calldata);
1916 }
1917
1918 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1919                 fmode_t fmode)
1920 {
1921         spin_lock(&state->owner->so_lock);
1922         if (!(fmode & FMODE_READ))
1923                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1924         if (!(fmode & FMODE_WRITE))
1925                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1926         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1927         spin_unlock(&state->owner->so_lock);
1928 }
1929
1930 static void nfs4_close_done(struct rpc_task *task, void *data)
1931 {
1932         struct nfs4_closedata *calldata = data;
1933         struct nfs4_state *state = calldata->state;
1934         struct nfs_server *server = NFS_SERVER(calldata->inode);
1935
1936         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1937                 return;
1938         /* hmm. we are done with the inode, and in the process of freeing
1939          * the state_owner. we keep this around to process errors
1940          */
1941         switch (task->tk_status) {
1942                 case 0:
1943                         if (calldata->roc)
1944                                 pnfs_roc_set_barrier(state->inode,
1945                                                      calldata->roc_barrier);
1946                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1947                         renew_lease(server, calldata->timestamp);
1948                         nfs4_close_clear_stateid_flags(state,
1949                                         calldata->arg.fmode);
1950                         break;
1951                 case -NFS4ERR_STALE_STATEID:
1952                 case -NFS4ERR_OLD_STATEID:
1953                 case -NFS4ERR_BAD_STATEID:
1954                 case -NFS4ERR_EXPIRED:
1955                         if (calldata->arg.fmode == 0)
1956                                 break;
1957                 default:
1958                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1959                                 rpc_restart_call_prepare(task);
1960         }
1961         nfs_release_seqid(calldata->arg.seqid);
1962         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1963 }
1964
1965 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1966 {
1967         struct nfs4_closedata *calldata = data;
1968         struct nfs4_state *state = calldata->state;
1969         int call_close = 0;
1970
1971         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1972                 return;
1973
1974         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1975         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1976         spin_lock(&state->owner->so_lock);
1977         /* Calculate the change in open mode */
1978         if (state->n_rdwr == 0) {
1979                 if (state->n_rdonly == 0) {
1980                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1981                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1982                         calldata->arg.fmode &= ~FMODE_READ;
1983                 }
1984                 if (state->n_wronly == 0) {
1985                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1986                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1987                         calldata->arg.fmode &= ~FMODE_WRITE;
1988                 }
1989         }
1990         spin_unlock(&state->owner->so_lock);
1991
1992         if (!call_close) {
1993                 /* Note: exit _without_ calling nfs4_close_done */
1994                 task->tk_action = NULL;
1995                 return;
1996         }
1997
1998         if (calldata->arg.fmode == 0) {
1999                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2000                 if (calldata->roc &&
2001                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2002                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2003                                      task, NULL);
2004                         return;
2005                 }
2006         }
2007
2008         nfs_fattr_init(calldata->res.fattr);
2009         calldata->timestamp = jiffies;
2010         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2011                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2012                                 1, task))
2013                 return;
2014         rpc_call_start(task);
2015 }
2016
2017 static const struct rpc_call_ops nfs4_close_ops = {
2018         .rpc_call_prepare = nfs4_close_prepare,
2019         .rpc_call_done = nfs4_close_done,
2020         .rpc_release = nfs4_free_closedata,
2021 };
2022
2023 /*
2024  * It is possible for data to be read/written from a mem-mapped file
2025  * after the sys_close call (which hits the vfs layer as a flush).
2026  * This means that we can't safely call nfsv4 close on a file until
2027  * the inode is cleared. This in turn means that we are not good
2028  * NFSv4 citizens - we do not indicate to the server to update the file's
2029  * share state even when we are done with one of the three share
2030  * stateid's in the inode.
2031  *
2032  * NOTE: Caller must be holding the sp->so_owner semaphore!
2033  */
2034 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2035 {
2036         struct nfs_server *server = NFS_SERVER(state->inode);
2037         struct nfs4_closedata *calldata;
2038         struct nfs4_state_owner *sp = state->owner;
2039         struct rpc_task *task;
2040         struct rpc_message msg = {
2041                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2042                 .rpc_cred = state->owner->so_cred,
2043         };
2044         struct rpc_task_setup task_setup_data = {
2045                 .rpc_client = server->client,
2046                 .rpc_message = &msg,
2047                 .callback_ops = &nfs4_close_ops,
2048                 .workqueue = nfsiod_workqueue,
2049                 .flags = RPC_TASK_ASYNC,
2050         };
2051         int status = -ENOMEM;
2052
2053         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2054         if (calldata == NULL)
2055                 goto out;
2056         calldata->inode = state->inode;
2057         calldata->state = state;
2058         calldata->arg.fh = NFS_FH(state->inode);
2059         calldata->arg.stateid = &state->open_stateid;
2060         /* Serialization for the sequence id */
2061         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2062         if (calldata->arg.seqid == NULL)
2063                 goto out_free_calldata;
2064         calldata->arg.fmode = 0;
2065         calldata->arg.bitmask = server->cache_consistency_bitmask;
2066         calldata->res.fattr = &calldata->fattr;
2067         calldata->res.seqid = calldata->arg.seqid;
2068         calldata->res.server = server;
2069         calldata->roc = roc;
2070         path_get(path);
2071         calldata->path = *path;
2072
2073         msg.rpc_argp = &calldata->arg;
2074         msg.rpc_resp = &calldata->res;
2075         task_setup_data.callback_data = calldata;
2076         task = rpc_run_task(&task_setup_data);
2077         if (IS_ERR(task))
2078                 return PTR_ERR(task);
2079         status = 0;
2080         if (wait)
2081                 status = rpc_wait_for_completion_task(task);
2082         rpc_put_task(task);
2083         return status;
2084 out_free_calldata:
2085         kfree(calldata);
2086 out:
2087         if (roc)
2088                 pnfs_roc_release(state->inode);
2089         nfs4_put_open_state(state);
2090         nfs4_put_state_owner(sp);
2091         return status;
2092 }
2093
2094 static struct inode *
2095 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2096 {
2097         struct nfs4_state *state;
2098
2099         /* Protect against concurrent sillydeletes */
2100         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2101         if (IS_ERR(state))
2102                 return ERR_CAST(state);
2103         ctx->state = state;
2104         return igrab(state->inode);
2105 }
2106
2107 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2108 {
2109         if (ctx->state == NULL)
2110                 return;
2111         if (is_sync)
2112                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2113         else
2114                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2115 }
2116
2117 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2118 {
2119         struct nfs4_server_caps_arg args = {
2120                 .fhandle = fhandle,
2121         };
2122         struct nfs4_server_caps_res res = {};
2123         struct rpc_message msg = {
2124                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2125                 .rpc_argp = &args,
2126                 .rpc_resp = &res,
2127         };
2128         int status;
2129
2130         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2131         if (status == 0) {
2132                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2133                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2134                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2135                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2136                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2137                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2138                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2139                         server->caps |= NFS_CAP_ACLS;
2140                 if (res.has_links != 0)
2141                         server->caps |= NFS_CAP_HARDLINKS;
2142                 if (res.has_symlinks != 0)
2143                         server->caps |= NFS_CAP_SYMLINKS;
2144                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2145                         server->caps |= NFS_CAP_FILEID;
2146                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2147                         server->caps |= NFS_CAP_MODE;
2148                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2149                         server->caps |= NFS_CAP_NLINK;
2150                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2151                         server->caps |= NFS_CAP_OWNER;
2152                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2153                         server->caps |= NFS_CAP_OWNER_GROUP;
2154                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2155                         server->caps |= NFS_CAP_ATIME;
2156                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2157                         server->caps |= NFS_CAP_CTIME;
2158                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2159                         server->caps |= NFS_CAP_MTIME;
2160
2161                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2162                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2163                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2164                 server->acl_bitmask = res.acl_bitmask;
2165         }
2166
2167         return status;
2168 }
2169
2170 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2171 {
2172         struct nfs4_exception exception = { };
2173         int err;
2174         do {
2175                 err = nfs4_handle_exception(server,
2176                                 _nfs4_server_capabilities(server, fhandle),
2177                                 &exception);
2178         } while (exception.retry);
2179         return err;
2180 }
2181
2182 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2183                 struct nfs_fsinfo *info)
2184 {
2185         struct nfs4_lookup_root_arg args = {
2186                 .bitmask = nfs4_fattr_bitmap,
2187         };
2188         struct nfs4_lookup_res res = {
2189                 .server = server,
2190                 .fattr = info->fattr,
2191                 .fh = fhandle,
2192         };
2193         struct rpc_message msg = {
2194                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2195                 .rpc_argp = &args,
2196                 .rpc_resp = &res,
2197         };
2198
2199         nfs_fattr_init(info->fattr);
2200         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2201 }
2202
2203 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2204                 struct nfs_fsinfo *info)
2205 {
2206         struct nfs4_exception exception = { };
2207         int err;
2208         do {
2209                 err = _nfs4_lookup_root(server, fhandle, info);
2210                 switch (err) {
2211                 case 0:
2212                 case -NFS4ERR_WRONGSEC:
2213                         break;
2214                 default:
2215                         err = nfs4_handle_exception(server, err, &exception);
2216                 }
2217         } while (exception.retry);
2218         return err;
2219 }
2220
2221 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2222                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2223 {
2224         struct rpc_auth *auth;
2225         int ret;
2226
2227         auth = rpcauth_create(flavor, server->client);
2228         if (!auth) {
2229                 ret = -EIO;
2230                 goto out;
2231         }
2232         ret = nfs4_lookup_root(server, fhandle, info);
2233 out:
2234         return ret;
2235 }
2236
2237 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2238                               struct nfs_fsinfo *info)
2239 {
2240         int i, len, status = 0;
2241         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2242
2243         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2244         flav_array[len] = RPC_AUTH_NULL;
2245         len += 1;
2246
2247         for (i = 0; i < len; i++) {
2248                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2249                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2250                         continue;
2251                 break;
2252         }
2253         /*
2254          * -EACCESS could mean that the user doesn't have correct permissions
2255          * to access the mount.  It could also mean that we tried to mount
2256          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2257          * existing mount programs don't handle -EACCES very well so it should
2258          * be mapped to -EPERM instead.
2259          */
2260         if (status == -EACCES)
2261                 status = -EPERM;
2262         return status;
2263 }
2264
2265 /*
2266  * get the file handle for the "/" directory on the server
2267  */
2268 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2269                               struct nfs_fsinfo *info)
2270 {
2271         int minor_version = server->nfs_client->cl_minorversion;
2272         int status = nfs4_lookup_root(server, fhandle, info);
2273         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2274                 /*
2275                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2276                  * by nfs4_map_errors() as this function exits.
2277                  */
2278                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2279         if (status == 0)
2280                 status = nfs4_server_capabilities(server, fhandle);
2281         if (status == 0)
2282                 status = nfs4_do_fsinfo(server, fhandle, info);
2283         return nfs4_map_errors(status);
2284 }
2285
2286 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2287 /*
2288  * Get locations and (maybe) other attributes of a referral.
2289  * Note that we'll actually follow the referral later when
2290  * we detect fsid mismatch in inode revalidation
2291  */
2292 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2293                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2294 {
2295         int status = -ENOMEM;
2296         struct page *page = NULL;
2297         struct nfs4_fs_locations *locations = NULL;
2298
2299         page = alloc_page(GFP_KERNEL);
2300         if (page == NULL)
2301                 goto out;
2302         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2303         if (locations == NULL)
2304                 goto out;
2305
2306         status = nfs4_proc_fs_locations(dir, name, locations, page);
2307         if (status != 0)
2308                 goto out;
2309         /* Make sure server returned a different fsid for the referral */
2310         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2311                 dprintk("%s: server did not return a different fsid for"
2312                         " a referral at %s\n", __func__, name->name);
2313                 status = -EIO;
2314                 goto out;
2315         }
2316         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2317         nfs_fixup_referral_attributes(&locations->fattr);
2318
2319         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2320         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2321         memset(fhandle, 0, sizeof(struct nfs_fh));
2322 out:
2323         if (page)
2324                 __free_page(page);
2325         kfree(locations);
2326         return status;
2327 }
2328
2329 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2330 {
2331         struct nfs4_getattr_arg args = {
2332                 .fh = fhandle,
2333                 .bitmask = server->attr_bitmask,
2334         };
2335         struct nfs4_getattr_res res = {
2336                 .fattr = fattr,
2337                 .server = server,
2338         };
2339         struct rpc_message msg = {
2340                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2341                 .rpc_argp = &args,
2342                 .rpc_resp = &res,
2343         };
2344
2345         nfs_fattr_init(fattr);
2346         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2347 }
2348
2349 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2350 {
2351         struct nfs4_exception exception = { };
2352         int err;
2353         do {
2354                 err = nfs4_handle_exception(server,
2355                                 _nfs4_proc_getattr(server, fhandle, fattr),
2356                                 &exception);
2357         } while (exception.retry);
2358         return err;
2359 }
2360
2361 /*
2362  * The file is not closed if it is opened due to the a request to change
2363  * the size of the file. The open call will not be needed once the
2364  * VFS layer lookup-intents are implemented.
2365  *
2366  * Close is called when the inode is destroyed.
2367  * If we haven't opened the file for O_WRONLY, we
2368  * need to in the size_change case to obtain a stateid.
2369  *
2370  * Got race?
2371  * Because OPEN is always done by name in nfsv4, it is
2372  * possible that we opened a different file by the same
2373  * name.  We can recognize this race condition, but we
2374  * can't do anything about it besides returning an error.
2375  *
2376  * This will be fixed with VFS changes (lookup-intent).
2377  */
2378 static int
2379 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2380                   struct iattr *sattr)
2381 {
2382         struct inode *inode = dentry->d_inode;
2383         struct rpc_cred *cred = NULL;
2384         struct nfs4_state *state = NULL;
2385         int status;
2386
2387         if (pnfs_ld_layoutret_on_setattr(inode))
2388                 pnfs_return_layout(inode);
2389
2390         nfs_fattr_init(fattr);
2391
2392         /* Search for an existing open(O_WRITE) file */
2393         if (sattr->ia_valid & ATTR_FILE) {
2394                 struct nfs_open_context *ctx;
2395
2396                 ctx = nfs_file_open_context(sattr->ia_file);
2397                 if (ctx) {
2398                         cred = ctx->cred;
2399                         state = ctx->state;
2400                 }
2401         }
2402
2403         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2404         if (status == 0)
2405                 nfs_setattr_update_inode(inode, sattr);
2406         return status;
2407 }
2408
2409 static int _nfs4_proc_lookupfh(struct rpc_clnt *clnt, struct nfs_server *server,
2410                 const struct nfs_fh *dirfh, const struct qstr *name,
2411                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2412 {
2413         int                    status;
2414         struct nfs4_lookup_arg args = {
2415                 .bitmask = server->attr_bitmask,
2416                 .dir_fh = dirfh,
2417                 .name = name,
2418         };
2419         struct nfs4_lookup_res res = {
2420                 .server = server,
2421                 .fattr = fattr,
2422                 .fh = fhandle,
2423         };
2424         struct rpc_message msg = {
2425                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2426                 .rpc_argp = &args,
2427                 .rpc_resp = &res,
2428         };
2429
2430         nfs_fattr_init(fattr);
2431
2432         dprintk("NFS call  lookupfh %s\n", name->name);
2433         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2434         dprintk("NFS reply lookupfh: %d\n", status);
2435         return status;
2436 }
2437
2438 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2439                               struct qstr *name, struct nfs_fh *fhandle,
2440                               struct nfs_fattr *fattr)
2441 {
2442         struct nfs4_exception exception = { };
2443         int err;
2444         do {
2445                 err = _nfs4_proc_lookupfh(server->client, server, dirfh, name, fhandle, fattr);
2446                 /* FIXME: !!!! */
2447                 if (err == -NFS4ERR_MOVED) {
2448                         err = -EREMOTE;
2449                         break;
2450                 }
2451                 err = nfs4_handle_exception(server, err, &exception);
2452         } while (exception.retry);
2453         return err;
2454 }
2455
2456 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2457                 const struct qstr *name, struct nfs_fh *fhandle,
2458                 struct nfs_fattr *fattr)
2459 {
2460         int status;
2461
2462         dprintk("NFS call  lookup %s\n", name->name);
2463         status = _nfs4_proc_lookupfh(clnt, NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2464         if (status == -NFS4ERR_MOVED)
2465                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2466         dprintk("NFS reply lookup: %d\n", status);
2467         return status;
2468 }
2469
2470 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2471 {
2472         memset(fh, 0, sizeof(struct nfs_fh));
2473         fattr->fsid.major = 1;
2474         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2475                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2476         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2477         fattr->nlink = 2;
2478 }
2479
2480 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2481                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2482 {
2483         struct nfs4_exception exception = { };
2484         int err;
2485         do {
2486                 err = nfs4_handle_exception(NFS_SERVER(dir),
2487                                 _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr),
2488                                 &exception);
2489                 if (err == -EPERM)
2490                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2491         } while (exception.retry);
2492         return err;
2493 }
2494
2495 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2496 {
2497         struct nfs_server *server = NFS_SERVER(inode);
2498         struct nfs4_accessargs args = {
2499                 .fh = NFS_FH(inode),
2500                 .bitmask = server->attr_bitmask,
2501         };
2502         struct nfs4_accessres res = {
2503                 .server = server,
2504         };
2505         struct rpc_message msg = {
2506                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2507                 .rpc_argp = &args,
2508                 .rpc_resp = &res,
2509                 .rpc_cred = entry->cred,
2510         };
2511         int mode = entry->mask;
2512         int status;
2513
2514         /*
2515          * Determine which access bits we want to ask for...
2516          */
2517         if (mode & MAY_READ)
2518                 args.access |= NFS4_ACCESS_READ;
2519         if (S_ISDIR(inode->i_mode)) {
2520                 if (mode & MAY_WRITE)
2521                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2522                 if (mode & MAY_EXEC)
2523                         args.access |= NFS4_ACCESS_LOOKUP;
2524         } else {
2525                 if (mode & MAY_WRITE)
2526                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2527                 if (mode & MAY_EXEC)
2528                         args.access |= NFS4_ACCESS_EXECUTE;
2529         }
2530
2531         res.fattr = nfs_alloc_fattr();
2532         if (res.fattr == NULL)
2533                 return -ENOMEM;
2534
2535         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2536         if (!status) {
2537                 entry->mask = 0;
2538                 if (res.access & NFS4_ACCESS_READ)
2539                         entry->mask |= MAY_READ;
2540                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2541                         entry->mask |= MAY_WRITE;
2542                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2543                         entry->mask |= MAY_EXEC;
2544                 nfs_refresh_inode(inode, res.fattr);
2545         }
2546         nfs_free_fattr(res.fattr);
2547         return status;
2548 }
2549
2550 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2551 {
2552         struct nfs4_exception exception = { };
2553         int err;
2554         do {
2555                 err = nfs4_handle_exception(NFS_SERVER(inode),
2556                                 _nfs4_proc_access(inode, entry),
2557                                 &exception);
2558         } while (exception.retry);
2559         return err;
2560 }
2561
2562 /*
2563  * TODO: For the time being, we don't try to get any attributes
2564  * along with any of the zero-copy operations READ, READDIR,
2565  * READLINK, WRITE.
2566  *
2567  * In the case of the first three, we want to put the GETATTR
2568  * after the read-type operation -- this is because it is hard
2569  * to predict the length of a GETATTR response in v4, and thus
2570  * align the READ data correctly.  This means that the GETATTR
2571  * may end up partially falling into the page cache, and we should
2572  * shift it into the 'tail' of the xdr_buf before processing.
2573  * To do this efficiently, we need to know the total length
2574  * of data received, which doesn't seem to be available outside
2575  * of the RPC layer.
2576  *
2577  * In the case of WRITE, we also want to put the GETATTR after
2578  * the operation -- in this case because we want to make sure
2579  * we get the post-operation mtime and size.  This means that
2580  * we can't use xdr_encode_pages() as written: we need a variant
2581  * of it which would leave room in the 'tail' iovec.
2582  *
2583  * Both of these changes to the XDR layer would in fact be quite
2584  * minor, but I decided to leave them for a subsequent patch.
2585  */
2586 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2587                 unsigned int pgbase, unsigned int pglen)
2588 {
2589         struct nfs4_readlink args = {
2590                 .fh       = NFS_FH(inode),
2591                 .pgbase   = pgbase,
2592                 .pglen    = pglen,
2593                 .pages    = &page,
2594         };
2595         struct nfs4_readlink_res res;
2596         struct rpc_message msg = {
2597                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2598                 .rpc_argp = &args,
2599                 .rpc_resp = &res,
2600         };
2601
2602         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2603 }
2604
2605 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2606                 unsigned int pgbase, unsigned int pglen)
2607 {
2608         struct nfs4_exception exception = { };
2609         int err;
2610         do {
2611                 err = nfs4_handle_exception(NFS_SERVER(inode),
2612                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2613                                 &exception);
2614         } while (exception.retry);
2615         return err;
2616 }
2617
2618 /*
2619  * Got race?
2620  * We will need to arrange for the VFS layer to provide an atomic open.
2621  * Until then, this create/open method is prone to inefficiency and race
2622  * conditions due to the lookup, create, and open VFS calls from sys_open()
2623  * placed on the wire.
2624  *
2625  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2626  * The file will be opened again in the subsequent VFS open call
2627  * (nfs4_proc_file_open).
2628  *
2629  * The open for read will just hang around to be used by any process that
2630  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2631  */
2632
2633 static int
2634 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2635                  int flags, struct nfs_open_context *ctx)
2636 {
2637         struct path my_path = {
2638                 .dentry = dentry,
2639         };
2640         struct path *path = &my_path;
2641         struct nfs4_state *state;
2642         struct rpc_cred *cred = NULL;
2643         fmode_t fmode = 0;
2644         int status = 0;
2645
2646         if (ctx != NULL) {
2647                 cred = ctx->cred;
2648                 path = &ctx->path;
2649                 fmode = ctx->mode;
2650         }
2651         sattr->ia_mode &= ~current_umask();
2652         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2653         d_drop(dentry);
2654         if (IS_ERR(state)) {
2655                 status = PTR_ERR(state);
2656                 goto out;
2657         }
2658         d_add(dentry, igrab(state->inode));
2659         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2660         if (ctx != NULL)
2661                 ctx->state = state;
2662         else
2663                 nfs4_close_sync(path, state, fmode);
2664 out:
2665         return status;
2666 }
2667
2668 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2669 {
2670         struct nfs_server *server = NFS_SERVER(dir);
2671         struct nfs_removeargs args = {
2672                 .fh = NFS_FH(dir),
2673                 .name.len = name->len,
2674                 .name.name = name->name,
2675                 .bitmask = server->attr_bitmask,
2676         };
2677         struct nfs_removeres res = {
2678                 .server = server,
2679         };
2680         struct rpc_message msg = {
2681                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2682                 .rpc_argp = &args,
2683                 .rpc_resp = &res,
2684         };
2685         int status = -ENOMEM;
2686
2687         res.dir_attr = nfs_alloc_fattr();
2688         if (res.dir_attr == NULL)
2689                 goto out;
2690
2691         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2692         if (status == 0) {
2693                 update_changeattr(dir, &res.cinfo);
2694                 nfs_post_op_update_inode(dir, res.dir_attr);
2695         }
2696         nfs_free_fattr(res.dir_attr);
2697 out:
2698         return status;
2699 }
2700
2701 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2702 {
2703         struct nfs4_exception exception = { };
2704         int err;
2705         do {
2706                 err = nfs4_handle_exception(NFS_SERVER(dir),
2707                                 _nfs4_proc_remove(dir, name),
2708                                 &exception);
2709         } while (exception.retry);
2710         return err;
2711 }
2712
2713 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2714 {
2715         struct nfs_server *server = NFS_SERVER(dir);
2716         struct nfs_removeargs *args = msg->rpc_argp;
2717         struct nfs_removeres *res = msg->rpc_resp;
2718
2719         args->bitmask = server->cache_consistency_bitmask;
2720         res->server = server;
2721         res->seq_res.sr_slot = NULL;
2722         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2723 }
2724
2725 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2726 {
2727         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2728
2729         if (!nfs4_sequence_done(task, &res->seq_res))
2730                 return 0;
2731         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2732                 return 0;
2733         update_changeattr(dir, &res->cinfo);
2734         nfs_post_op_update_inode(dir, res->dir_attr);
2735         return 1;
2736 }
2737
2738 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2739 {
2740         struct nfs_server *server = NFS_SERVER(dir);
2741         struct nfs_renameargs *arg = msg->rpc_argp;
2742         struct nfs_renameres *res = msg->rpc_resp;
2743
2744         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2745         arg->bitmask = server->attr_bitmask;
2746         res->server = server;
2747 }
2748
2749 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2750                                  struct inode *new_dir)
2751 {
2752         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2753
2754         if (!nfs4_sequence_done(task, &res->seq_res))
2755                 return 0;
2756         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2757                 return 0;
2758
2759         update_changeattr(old_dir, &res->old_cinfo);
2760         nfs_post_op_update_inode(old_dir, res->old_fattr);
2761         update_changeattr(new_dir, &res->new_cinfo);
2762         nfs_post_op_update_inode(new_dir, res->new_fattr);
2763         return 1;
2764 }
2765
2766 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2767                 struct inode *new_dir, struct qstr *new_name)
2768 {
2769         struct nfs_server *server = NFS_SERVER(old_dir);
2770         struct nfs_renameargs arg = {
2771                 .old_dir = NFS_FH(old_dir),
2772                 .new_dir = NFS_FH(new_dir),
2773                 .old_name = old_name,
2774                 .new_name = new_name,
2775                 .bitmask = server->attr_bitmask,
2776         };
2777         struct nfs_renameres res = {
2778                 .server = server,
2779         };
2780         struct rpc_message msg = {
2781                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2782                 .rpc_argp = &arg,
2783                 .rpc_resp = &res,
2784         };
2785         int status = -ENOMEM;
2786
2787         res.old_fattr = nfs_alloc_fattr();
2788         res.new_fattr = nfs_alloc_fattr();
2789         if (res.old_fattr == NULL || res.new_fattr == NULL)
2790                 goto out;
2791
2792         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2793         if (!status) {
2794                 update_changeattr(old_dir, &res.old_cinfo);
2795                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2796                 update_changeattr(new_dir, &res.new_cinfo);
2797                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2798         }
2799 out:
2800         nfs_free_fattr(res.new_fattr);
2801         nfs_free_fattr(res.old_fattr);
2802         return status;
2803 }
2804
2805 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2806                 struct inode *new_dir, struct qstr *new_name)
2807 {
2808         struct nfs4_exception exception = { };
2809         int err;
2810         do {
2811                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2812                                 _nfs4_proc_rename(old_dir, old_name,
2813                                         new_dir, new_name),
2814                                 &exception);
2815         } while (exception.retry);
2816         return err;
2817 }
2818
2819 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2820 {
2821         struct nfs_server *server = NFS_SERVER(inode);
2822         struct nfs4_link_arg arg = {
2823                 .fh     = NFS_FH(inode),
2824                 .dir_fh = NFS_FH(dir),
2825                 .name   = name,
2826                 .bitmask = server->attr_bitmask,
2827         };
2828         struct nfs4_link_res res = {
2829                 .server = server,
2830         };
2831         struct rpc_message msg = {
2832                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2833                 .rpc_argp = &arg,
2834                 .rpc_resp = &res,
2835         };
2836         int status = -ENOMEM;
2837
2838         res.fattr = nfs_alloc_fattr();
2839         res.dir_attr = nfs_alloc_fattr();
2840         if (res.fattr == NULL || res.dir_attr == NULL)
2841                 goto out;
2842
2843         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2844         if (!status) {
2845                 update_changeattr(dir, &res.cinfo);
2846                 nfs_post_op_update_inode(dir, res.dir_attr);
2847                 nfs_post_op_update_inode(inode, res.fattr);
2848         }
2849 out:
2850         nfs_free_fattr(res.dir_attr);
2851         nfs_free_fattr(res.fattr);
2852         return status;
2853 }
2854
2855 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2856 {
2857         struct nfs4_exception exception = { };
2858         int err;
2859         do {
2860                 err = nfs4_handle_exception(NFS_SERVER(inode),
2861                                 _nfs4_proc_link(inode, dir, name),
2862                                 &exception);
2863         } while (exception.retry);
2864         return err;
2865 }
2866
2867 struct nfs4_createdata {
2868         struct rpc_message msg;
2869         struct nfs4_create_arg arg;
2870         struct nfs4_create_res res;
2871         struct nfs_fh fh;
2872         struct nfs_fattr fattr;
2873         struct nfs_fattr dir_fattr;
2874 };
2875
2876 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2877                 struct qstr *name, struct iattr *sattr, u32 ftype)
2878 {
2879         struct nfs4_createdata *data;
2880
2881         data = kzalloc(sizeof(*data), GFP_KERNEL);
2882         if (data != NULL) {
2883                 struct nfs_server *server = NFS_SERVER(dir);
2884
2885                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2886                 data->msg.rpc_argp = &data->arg;
2887                 data->msg.rpc_resp = &data->res;
2888                 data->arg.dir_fh = NFS_FH(dir);
2889                 data->arg.server = server;
2890                 data->arg.name = name;
2891                 data->arg.attrs = sattr;
2892                 data->arg.ftype = ftype;
2893                 data->arg.bitmask = server->attr_bitmask;
2894                 data->res.server = server;
2895                 data->res.fh = &data->fh;
2896                 data->res.fattr = &data->fattr;
2897                 data->res.dir_fattr = &data->dir_fattr;
2898                 nfs_fattr_init(data->res.fattr);
2899                 nfs_fattr_init(data->res.dir_fattr);
2900         }
2901         return data;
2902 }
2903
2904 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2905 {
2906         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2907                                     &data->arg.seq_args, &data->res.seq_res, 1);
2908         if (status == 0) {
2909                 update_changeattr(dir, &data->res.dir_cinfo);
2910                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2911                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2912         }
2913         return status;
2914 }
2915
2916 static void nfs4_free_createdata(struct nfs4_createdata *data)
2917 {
2918         kfree(data);
2919 }
2920
2921 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2922                 struct page *page, unsigned int len, struct iattr *sattr)
2923 {
2924         struct nfs4_createdata *data;
2925         int status = -ENAMETOOLONG;
2926
2927         if (len > NFS4_MAXPATHLEN)
2928                 goto out;
2929
2930         status = -ENOMEM;
2931         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2932         if (data == NULL)
2933                 goto out;
2934
2935         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2936         data->arg.u.symlink.pages = &page;
2937         data->arg.u.symlink.len = len;
2938
2939         status = nfs4_do_create(dir, dentry, data);
2940
2941         nfs4_free_createdata(data);
2942 out:
2943         return status;
2944 }
2945
2946 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2947                 struct page *page, unsigned int len, struct iattr *sattr)
2948 {
2949         struct nfs4_exception exception = { };
2950         int err;
2951         do {
2952                 err = nfs4_handle_exception(NFS_SERVER(dir),
2953                                 _nfs4_proc_symlink(dir, dentry, page,
2954                                                         len, sattr),
2955                                 &exception);
2956         } while (exception.retry);
2957         return err;
2958 }
2959
2960 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2961                 struct iattr *sattr)
2962 {
2963         struct nfs4_createdata *data;
2964         int status = -ENOMEM;
2965
2966         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2967         if (data == NULL)
2968                 goto out;
2969
2970         status = nfs4_do_create(dir, dentry, data);
2971
2972         nfs4_free_createdata(data);
2973 out:
2974         return status;
2975 }
2976
2977 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2978                 struct iattr *sattr)
2979 {
2980         struct nfs4_exception exception = { };
2981         int err;
2982
2983         sattr->ia_mode &= ~current_umask();
2984         do {
2985                 err = nfs4_handle_exception(NFS_SERVER(dir),
2986                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2987                                 &exception);
2988         } while (exception.retry);
2989         return err;
2990 }
2991
2992 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2993                 u64 cookie, struct page **pages, unsigned int count, int plus)
2994 {
2995         struct inode            *dir = dentry->d_inode;
2996         struct nfs4_readdir_arg args = {
2997                 .fh = NFS_FH(dir),
2998                 .pages = pages,
2999                 .pgbase = 0,
3000                 .count = count,
3001                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3002                 .plus = plus,
3003         };
3004         struct nfs4_readdir_res res;
3005         struct rpc_message msg = {
3006                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3007                 .rpc_argp = &args,
3008                 .rpc_resp = &res,
3009                 .rpc_cred = cred,
3010         };
3011         int                     status;
3012
3013         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3014                         dentry->d_parent->d_name.name,
3015                         dentry->d_name.name,
3016                         (unsigned long long)cookie);
3017         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3018         res.pgbase = args.pgbase;
3019         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3020         if (status >= 0) {
3021                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3022                 status += args.pgbase;
3023         }
3024
3025         nfs_invalidate_atime(dir);
3026
3027         dprintk("%s: returns %d\n", __func__, status);
3028         return status;
3029 }
3030
3031 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3032                 u64 cookie, struct page **pages, unsigned int count, int plus)
3033 {
3034         struct nfs4_exception exception = { };
3035         int err;
3036         do {
3037                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3038                                 _nfs4_proc_readdir(dentry, cred, cookie,
3039                                         pages, count, plus),
3040                                 &exception);
3041         } while (exception.retry);
3042         return err;
3043 }
3044
3045 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3046                 struct iattr *sattr, dev_t rdev)
3047 {
3048         struct nfs4_createdata *data;
3049         int mode = sattr->ia_mode;
3050         int status = -ENOMEM;
3051
3052         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3053         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3054
3055         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3056         if (data == NULL)
3057                 goto out;
3058
3059         if (S_ISFIFO(mode))
3060                 data->arg.ftype = NF4FIFO;
3061         else if (S_ISBLK(mode)) {
3062                 data->arg.ftype = NF4BLK;
3063                 data->arg.u.device.specdata1 = MAJOR(rdev);
3064                 data->arg.u.device.specdata2 = MINOR(rdev);
3065         }
3066         else if (S_ISCHR(mode)) {
3067                 data->arg.ftype = NF4CHR;
3068                 data->arg.u.device.specdata1 = MAJOR(rdev);
3069                 data->arg.u.device.specdata2 = MINOR(rdev);
3070         }
3071
3072         status = nfs4_do_create(dir, dentry, data);
3073
3074         nfs4_free_createdata(data);
3075 out:
3076         return status;
3077 }
3078
3079 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3080                 struct iattr *sattr, dev_t rdev)
3081 {
3082         struct nfs4_exception exception = { };
3083         int err;
3084
3085         sattr->ia_mode &= ~current_umask();
3086         do {
3087                 err = nfs4_handle_exception(NFS_SERVER(dir),
3088                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3089                                 &exception);
3090         } while (exception.retry);
3091         return err;
3092 }
3093
3094 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3095                  struct nfs_fsstat *fsstat)
3096 {
3097         struct nfs4_statfs_arg args = {
3098                 .fh = fhandle,
3099                 .bitmask = server->attr_bitmask,
3100         };
3101         struct nfs4_statfs_res res = {
3102                 .fsstat = fsstat,
3103         };
3104         struct rpc_message msg = {
3105                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3106                 .rpc_argp = &args,
3107                 .rpc_resp = &res,
3108         };
3109
3110         nfs_fattr_init(fsstat->fattr);
3111         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3112 }
3113
3114 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3115 {
3116         struct nfs4_exception exception = { };
3117         int err;
3118         do {
3119                 err = nfs4_handle_exception(server,
3120                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3121                                 &exception);
3122         } while (exception.retry);
3123         return err;
3124 }
3125
3126 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3127                 struct nfs_fsinfo *fsinfo)
3128 {
3129         struct nfs4_fsinfo_arg args = {
3130                 .fh = fhandle,
3131                 .bitmask = server->attr_bitmask,
3132         };
3133         struct nfs4_fsinfo_res res = {
3134                 .fsinfo = fsinfo,
3135         };
3136         struct rpc_message msg = {
3137                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3138                 .rpc_argp = &args,
3139                 .rpc_resp = &res,
3140         };
3141
3142         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3143 }
3144
3145 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3146 {
3147         struct nfs4_exception exception = { };
3148         int err;
3149
3150         do {
3151                 err = nfs4_handle_exception(server,
3152                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3153                                 &exception);
3154         } while (exception.retry);
3155         return err;
3156 }
3157
3158 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3159 {
3160         nfs_fattr_init(fsinfo->fattr);
3161         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3162 }
3163
3164 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3165                 struct nfs_pathconf *pathconf)
3166 {
3167         struct nfs4_pathconf_arg args = {
3168                 .fh = fhandle,
3169                 .bitmask = server->attr_bitmask,
3170         };
3171         struct nfs4_pathconf_res res = {
3172                 .pathconf = pathconf,
3173         };
3174         struct rpc_message msg = {
3175                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3176                 .rpc_argp = &args,
3177                 .rpc_resp = &res,
3178         };
3179
3180         /* None of the pathconf attributes are mandatory to implement */
3181         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3182                 memset(pathconf, 0, sizeof(*pathconf));
3183                 return 0;
3184         }
3185
3186         nfs_fattr_init(pathconf->fattr);
3187         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3188 }
3189
3190 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3191                 struct nfs_pathconf *pathconf)
3192 {
3193         struct nfs4_exception exception = { };
3194         int err;
3195
3196         do {
3197                 err = nfs4_handle_exception(server,
3198                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3199                                 &exception);
3200         } while (exception.retry);
3201         return err;
3202 }
3203
3204 void __nfs4_read_done_cb(struct nfs_read_data *data)
3205 {
3206         nfs_invalidate_atime(data->inode);
3207 }
3208
3209 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3210 {
3211         struct nfs_server *server = NFS_SERVER(data->inode);
3212
3213         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3214                 nfs_restart_rpc(task, server->nfs_client);
3215                 return -EAGAIN;
3216         }
3217
3218         __nfs4_read_done_cb(data);
3219         if (task->tk_status > 0)
3220                 renew_lease(server, data->timestamp);
3221         return 0;
3222 }
3223
3224 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3225 {
3226
3227         dprintk("--> %s\n", __func__);
3228
3229         if (!nfs4_sequence_done(task, &data->res.seq_res))
3230                 return -EAGAIN;
3231
3232         return data->read_done_cb ? data->read_done_cb(task, data) :
3233                                     nfs4_read_done_cb(task, data);
3234 }
3235
3236 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3237 {
3238         data->timestamp   = jiffies;
3239         data->read_done_cb = nfs4_read_done_cb;
3240         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3241 }
3242
3243 /* Reset the the nfs_read_data to send the read to the MDS. */
3244 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3245 {
3246         dprintk("%s Reset task for i/o through\n", __func__);
3247         put_lseg(data->lseg);
3248         data->lseg = NULL;
3249         /* offsets will differ in the dense stripe case */
3250         data->args.offset = data->mds_offset;
3251         data->ds_clp = NULL;
3252         data->args.fh     = NFS_FH(data->inode);
3253         data->read_done_cb = nfs4_read_done_cb;
3254         task->tk_ops = data->mds_ops;
3255         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3256 }
3257 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3258
3259 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3260 {
3261         struct inode *inode = data->inode;
3262
3263         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3264                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3265                 return -EAGAIN;
3266         }
3267         if (task->tk_status >= 0) {
3268                 renew_lease(NFS_SERVER(inode), data->timestamp);
3269                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3270         }
3271         return 0;
3272 }
3273
3274 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3275 {
3276         if (!nfs4_sequence_done(task, &data->res.seq_res))
3277                 return -EAGAIN;
3278         return data->write_done_cb ? data->write_done_cb(task, data) :
3279                 nfs4_write_done_cb(task, data);
3280 }
3281
3282 /* Reset the the nfs_write_data to send the write to the MDS. */
3283 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3284 {
3285         dprintk("%s Reset task for i/o through\n", __func__);
3286         put_lseg(data->lseg);
3287         data->lseg          = NULL;
3288         data->ds_clp        = NULL;
3289         data->write_done_cb = nfs4_write_done_cb;
3290         data->args.fh       = NFS_FH(data->inode);
3291         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3292         data->args.offset   = data->mds_offset;
3293         data->res.fattr     = &data->fattr;
3294         task->tk_ops        = data->mds_ops;
3295         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3296 }
3297 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3298
3299 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3300 {
3301         struct nfs_server *server = NFS_SERVER(data->inode);
3302
3303         if (data->lseg) {
3304                 data->args.bitmask = NULL;
3305                 data->res.fattr = NULL;
3306         } else
3307                 data->args.bitmask = server->cache_consistency_bitmask;
3308         if (!data->write_done_cb)
3309                 data->write_done_cb = nfs4_write_done_cb;
3310         data->res.server = server;
3311         data->timestamp   = jiffies;
3312
3313         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3314 }
3315
3316 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3317 {
3318         struct inode *inode = data->inode;
3319
3320         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3321                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3322                 return -EAGAIN;
3323         }
3324         nfs_refresh_inode(inode, data->res.fattr);
3325         return 0;
3326 }
3327
3328 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3329 {
3330         if (!nfs4_sequence_done(task, &data->res.seq_res))
3331                 return -EAGAIN;
3332         return data->write_done_cb(task, data);
3333 }
3334
3335 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3336 {
3337         struct nfs_server *server = NFS_SERVER(data->inode);
3338
3339         if (data->lseg) {
3340                 data->args.bitmask = NULL;
3341                 data->res.fattr = NULL;
3342         } else
3343                 data->args.bitmask = server->cache_consistency_bitmask;
3344         if (!data->write_done_cb)
3345                 data->write_done_cb = nfs4_commit_done_cb;
3346         data->res.server = server;
3347         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3348 }
3349
3350 struct nfs4_renewdata {
3351         struct nfs_client       *client;
3352         unsigned long           timestamp;
3353 };
3354
3355 /*
3356  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3357  * standalone procedure for queueing an asynchronous RENEW.
3358  */
3359 static void nfs4_renew_release(void *calldata)
3360 {
3361         struct nfs4_renewdata *data = calldata;
3362         struct nfs_client *clp = data->client;
3363
3364         if (atomic_read(&clp->cl_count) > 1)
3365                 nfs4_schedule_state_renewal(clp);
3366         nfs_put_client(clp);
3367         kfree(data);
3368 }
3369
3370 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3371 {
3372         struct nfs4_renewdata *data = calldata;
3373         struct nfs_client *clp = data->client;
3374         unsigned long timestamp = data->timestamp;
3375
3376         if (task->tk_status < 0) {
3377                 /* Unless we're shutting down, schedule state recovery! */
3378                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3379                         nfs4_schedule_lease_recovery(clp);
3380                 return;
3381         }
3382         do_renew_lease(clp, timestamp);
3383 }
3384
3385 static const struct rpc_call_ops nfs4_renew_ops = {
3386         .rpc_call_done = nfs4_renew_done,
3387         .rpc_release = nfs4_renew_release,
3388 };
3389
3390 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3391 {
3392         struct rpc_message msg = {
3393                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3394                 .rpc_argp       = clp,
3395                 .rpc_cred       = cred,
3396         };
3397         struct nfs4_renewdata *data;
3398
3399         if (!atomic_inc_not_zero(&clp->cl_count))
3400                 return -EIO;
3401         data = kmalloc(sizeof(*data), GFP_KERNEL);
3402         if (data == NULL)
3403                 return -ENOMEM;
3404         data->client = clp;
3405         data->timestamp = jiffies;
3406         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3407                         &nfs4_renew_ops, data);
3408 }
3409
3410 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3411 {
3412         struct rpc_message msg = {
3413                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3414                 .rpc_argp       = clp,
3415                 .rpc_cred       = cred,
3416         };
3417         unsigned long now = jiffies;
3418         int status;
3419
3420         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3421         if (status < 0)
3422                 return status;
3423         do_renew_lease(clp, now);
3424         return 0;
3425 }
3426
3427 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3428 {
3429         return (server->caps & NFS_CAP_ACLS)
3430                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3431                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3432 }
3433
3434 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3435  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3436  * the stack.
3437  */
3438 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3439
3440 static void buf_to_pages(const void *buf, size_t buflen,
3441                 struct page **pages, unsigned int *pgbase)
3442 {
3443         const void *p = buf;
3444
3445         *pgbase = offset_in_page(buf);
3446         p -= *pgbase;
3447         while (p < buf + buflen) {
3448                 *(pages++) = virt_to_page(p);
3449                 p += PAGE_CACHE_SIZE;
3450         }
3451 }
3452
3453 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3454                 struct page **pages, unsigned int *pgbase)
3455 {
3456         struct page *newpage, **spages;
3457         int rc = 0;
3458         size_t len;
3459         spages = pages;
3460
3461         do {
3462                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3463                 newpage = alloc_page(GFP_KERNEL);
3464
3465                 if (newpage == NULL)
3466                         goto unwind;
3467                 memcpy(page_address(newpage), buf, len);
3468                 buf += len;
3469                 buflen -= len;
3470                 *pages++ = newpage;
3471                 rc++;
3472         } while (buflen != 0);
3473
3474         return rc;
3475
3476 unwind:
3477         for(; rc > 0; rc--)
3478                 __free_page(spages[rc-1]);
3479         return -ENOMEM;
3480 }
3481
3482 struct nfs4_cached_acl {
3483         int cached;
3484         size_t len;
3485         char data[0];
3486 };
3487
3488 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3489 {
3490         struct nfs_inode *nfsi = NFS_I(inode);
3491
3492         spin_lock(&inode->i_lock);
3493         kfree(nfsi->nfs4_acl);
3494         nfsi->nfs4_acl = acl;
3495         spin_unlock(&inode->i_lock);
3496 }
3497
3498 static void nfs4_zap_acl_attr(struct inode *inode)
3499 {
3500         nfs4_set_cached_acl(inode, NULL);
3501 }
3502
3503 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3504 {
3505         struct nfs_inode *nfsi = NFS_I(inode);
3506         struct nfs4_cached_acl *acl;
3507         int ret = -ENOENT;
3508
3509         spin_lock(&inode->i_lock);
3510         acl = nfsi->nfs4_acl;
3511         if (acl == NULL)
3512                 goto out;
3513         if (buf == NULL) /* user is just asking for length */
3514                 goto out_len;
3515         if (acl->cached == 0)
3516                 goto out;
3517         ret = -ERANGE; /* see getxattr(2) man page */
3518         if (acl->len > buflen)
3519                 goto out;
3520         memcpy(buf, acl->data, acl->len);
3521 out_len:
3522         ret = acl->len;
3523 out:
3524         spin_unlock(&inode->i_lock);
3525         return ret;
3526 }
3527
3528 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3529 {
3530         struct nfs4_cached_acl *acl;
3531
3532         if (buf && acl_len <= PAGE_SIZE) {
3533                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3534                 if (acl == NULL)
3535                         goto out;
3536                 acl->cached = 1;
3537                 memcpy(acl->data, buf, acl_len);
3538         } else {
3539                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3540                 if (acl == NULL)
3541                         goto out;
3542                 acl->cached = 0;
3543         }
3544         acl->len = acl_len;
3545 out:
3546         nfs4_set_cached_acl(inode, acl);
3547 }
3548
3549 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3550 {
3551         struct page *pages[NFS4ACL_MAXPAGES];
3552         struct nfs_getaclargs args = {
3553                 .fh = NFS_FH(inode),
3554                 .acl_pages = pages,
3555                 .acl_len = buflen,
3556         };
3557         struct nfs_getaclres res = {
3558                 .acl_len = buflen,
3559         };
3560         void *resp_buf;
3561         struct rpc_message msg = {
3562                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3563                 .rpc_argp = &args,
3564                 .rpc_resp = &res,
3565         };
3566         struct page *localpage = NULL;
3567         int ret;
3568
3569         if (buflen < PAGE_SIZE) {
3570                 /* As long as we're doing a round trip to the server anyway,
3571                  * let's be prepared for a page of acl data. */
3572                 localpage = alloc_page(GFP_KERNEL);
3573                 resp_buf = page_address(localpage);
3574                 if (localpage == NULL)
3575                         return -ENOMEM;
3576                 args.acl_pages[0] = localpage;
3577                 args.acl_pgbase = 0;
3578                 args.acl_len = PAGE_SIZE;
3579         } else {
3580                 resp_buf = buf;
3581                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3582         }
3583         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3584         if (ret)
3585                 goto out_free;
3586         if (res.acl_len > args.acl_len)
3587                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3588         else
3589                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3590         if (buf) {
3591                 ret = -ERANGE;
3592                 if (res.acl_len > buflen)
3593                         goto out_free;
3594                 if (localpage)
3595                         memcpy(buf, resp_buf, res.acl_len);
3596         }
3597         ret = res.acl_len;
3598 out_free:
3599         if (localpage)
3600                 __free_page(localpage);
3601         return ret;
3602 }
3603
3604 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3605 {
3606         struct nfs4_exception exception = { };
3607         ssize_t ret;
3608         do {
3609                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3610                 if (ret >= 0)
3611                         break;
3612                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3613         } while (exception.retry);
3614         return ret;
3615 }
3616
3617 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3618 {
3619         struct nfs_server *server = NFS_SERVER(inode);
3620         int ret;
3621
3622         if (!nfs4_server_supports_acls(server))
3623                 return -EOPNOTSUPP;
3624         ret = nfs_revalidate_inode(server, inode);
3625         if (ret < 0)
3626                 return ret;
3627         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3628                 nfs_zap_acl_cache(inode);
3629         ret = nfs4_read_cached_acl(inode, buf, buflen);
3630         if (ret != -ENOENT)
3631                 return ret;
3632         return nfs4_get_acl_uncached(inode, buf, buflen);
3633 }
3634
3635 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3636 {
3637         struct nfs_server *server = NFS_SERVER(inode);
3638         struct page *pages[NFS4ACL_MAXPAGES];
3639         struct nfs_setaclargs arg = {
3640                 .fh             = NFS_FH(inode),
3641                 .acl_pages      = pages,
3642                 .acl_len        = buflen,
3643         };
3644         struct nfs_setaclres res;
3645         struct rpc_message msg = {
3646                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3647                 .rpc_argp       = &arg,
3648                 .rpc_resp       = &res,
3649         };
3650         int ret, i;
3651
3652         if (!nfs4_server_supports_acls(server))
3653                 return -EOPNOTSUPP;
3654         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3655         if (i < 0)
3656                 return i;
3657         nfs_inode_return_delegation(inode);
3658         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3659
3660         /*
3661          * Free each page after tx, so the only ref left is
3662          * held by the network stack
3663          */
3664         for (; i > 0; i--)
3665                 put_page(pages[i-1]);
3666
3667         /*
3668          * Acl update can result in inode attribute update.
3669          * so mark the attribute cache invalid.
3670          */
3671         spin_lock(&inode->i_lock);
3672         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3673         spin_unlock(&inode->i_lock);
3674         nfs_access_zap_cache(inode);
3675         nfs_zap_acl_cache(inode);
3676         return ret;
3677 }
3678
3679 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3680 {
3681         struct nfs4_exception exception = { };
3682         int err;
3683         do {
3684                 err = nfs4_handle_exception(NFS_SERVER(inode),
3685                                 __nfs4_proc_set_acl(inode, buf, buflen),
3686                                 &exception);
3687         } while (exception.retry);
3688         return err;
3689 }
3690
3691 static int
3692 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3693 {
3694         struct nfs_client *clp = server->nfs_client;
3695
3696         if (task->tk_status >= 0)
3697                 return 0;
3698         switch(task->tk_status) {
3699                 case -NFS4ERR_ADMIN_REVOKED:
3700                 case -NFS4ERR_BAD_STATEID:
3701                 case -NFS4ERR_OPENMODE:
3702                         if (state == NULL)
3703                                 break;
3704                         nfs4_schedule_stateid_recovery(server, state);
3705                         goto wait_on_recovery;
3706                 case -NFS4ERR_EXPIRED:
3707                         if (state != NULL)
3708                                 nfs4_schedule_stateid_recovery(server, state);
3709                 case -NFS4ERR_STALE_STATEID:
3710                 case -NFS4ERR_STALE_CLIENTID:
3711                         nfs4_schedule_lease_recovery(clp);
3712                         goto wait_on_recovery;
3713 #if defined(CONFIG_NFS_V4_1)
3714                 case -NFS4ERR_BADSESSION:
3715                 case -NFS4ERR_BADSLOT:
3716                 case -NFS4ERR_BAD_HIGH_SLOT:
3717                 case -NFS4ERR_DEADSESSION:
3718                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3719                 case -NFS4ERR_SEQ_FALSE_RETRY:
3720                 case -NFS4ERR_SEQ_MISORDERED:
3721                         dprintk("%s ERROR %d, Reset session\n", __func__,
3722                                 task->tk_status);
3723                         nfs4_schedule_session_recovery(clp->cl_session);
3724                         task->tk_status = 0;
3725                         return -EAGAIN;
3726 #endif /* CONFIG_NFS_V4_1 */
3727                 case -NFS4ERR_DELAY:
3728                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3729                 case -NFS4ERR_GRACE:
3730                 case -EKEYEXPIRED:
3731                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3732                         task->tk_status = 0;
3733                         return -EAGAIN;
3734                 case -NFS4ERR_RETRY_UNCACHED_REP:
3735                 case -NFS4ERR_OLD_STATEID:
3736                         task->tk_status = 0;
3737                         return -EAGAIN;
3738         }
3739         task->tk_status = nfs4_map_errors(task->tk_status);
3740         return 0;
3741 wait_on_recovery:
3742         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3743         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3744                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3745         task->tk_status = 0;
3746         return -EAGAIN;
3747 }
3748
3749 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3750                 unsigned short port, struct rpc_cred *cred,
3751                 struct nfs4_setclientid_res *res)
3752 {
3753         nfs4_verifier sc_verifier;
3754         struct nfs4_setclientid setclientid = {
3755                 .sc_verifier = &sc_verifier,
3756                 .sc_prog = program,
3757                 .sc_cb_ident = clp->cl_cb_ident,
3758         };
3759         struct rpc_message msg = {
3760                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3761                 .rpc_argp = &setclientid,
3762                 .rpc_resp = res,
3763                 .rpc_cred = cred,
3764         };
3765         __be32 *p;
3766         int loop = 0;
3767         int status;
3768
3769         p = (__be32*)sc_verifier.data;
3770         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3771         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3772
3773         for(;;) {
3774                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3775                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3776                                 clp->cl_ipaddr,
3777                                 rpc_peeraddr2str(clp->cl_rpcclient,
3778                                                         RPC_DISPLAY_ADDR),
3779                                 rpc_peeraddr2str(clp->cl_rpcclient,
3780                                                         RPC_DISPLAY_PROTO),
3781                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3782                                 clp->cl_id_uniquifier);
3783                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3784                                 sizeof(setclientid.sc_netid),
3785                                 rpc_peeraddr2str(clp->cl_rpcclient,
3786                                                         RPC_DISPLAY_NETID));
3787                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3788                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3789                                 clp->cl_ipaddr, port >> 8, port & 255);
3790
3791                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3792                 if (status != -NFS4ERR_CLID_INUSE)
3793                         break;
3794                 if (loop != 0) {
3795                         ++clp->cl_id_uniquifier;
3796                         break;
3797                 }
3798                 ++loop;
3799                 ssleep(clp->cl_lease_time / HZ + 1);
3800         }
3801         return status;
3802 }
3803
3804 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3805                 struct nfs4_setclientid_res *arg,
3806                 struct rpc_cred *cred)
3807 {
3808         struct nfs_fsinfo fsinfo;
3809         struct rpc_message msg = {
3810                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3811                 .rpc_argp = arg,
3812                 .rpc_resp = &fsinfo,
3813                 .rpc_cred = cred,
3814         };
3815         unsigned long now;
3816         int status;
3817
3818         now = jiffies;
3819         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3820         if (status == 0) {
3821                 spin_lock(&clp->cl_lock);
3822                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3823                 clp->cl_last_renewal = now;
3824                 spin_unlock(&clp->cl_lock);
3825         }
3826         return status;
3827 }
3828
3829 struct nfs4_delegreturndata {
3830         struct nfs4_delegreturnargs args;
3831         struct nfs4_delegreturnres res;
3832         struct nfs_fh fh;
3833         nfs4_stateid stateid;
3834         unsigned long timestamp;
3835         struct nfs_fattr fattr;
3836         int rpc_status;
3837 };
3838
3839 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3840 {
3841         struct nfs4_delegreturndata *data = calldata;
3842
3843         if (!nfs4_sequence_done(task, &data->res.seq_res))
3844                 return;
3845
3846         switch (task->tk_status) {
3847         case -NFS4ERR_STALE_STATEID:
3848         case -NFS4ERR_EXPIRED:
3849         case 0:
3850                 renew_lease(data->res.server, data->timestamp);
3851                 break;
3852         default:
3853                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3854                                 -EAGAIN) {
3855                         nfs_restart_rpc(task, data->res.server->nfs_client);
3856                         return;
3857                 }
3858         }
3859         data->rpc_status = task->tk_status;
3860 }
3861
3862 static void nfs4_delegreturn_release(void *calldata)
3863 {
3864         kfree(calldata);
3865 }
3866
3867 #if defined(CONFIG_NFS_V4_1)
3868 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3869 {
3870         struct nfs4_delegreturndata *d_data;
3871
3872         d_data = (struct nfs4_delegreturndata *)data;
3873
3874         if (nfs4_setup_sequence(d_data->res.server,
3875                                 &d_data->args.seq_args,
3876                                 &d_data->res.seq_res, 1, task))
3877                 return;
3878         rpc_call_start(task);
3879 }
3880 #endif /* CONFIG_NFS_V4_1 */
3881
3882 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3883 #if defined(CONFIG_NFS_V4_1)
3884         .rpc_call_prepare = nfs4_delegreturn_prepare,
3885 #endif /* CONFIG_NFS_V4_1 */
3886         .rpc_call_done = nfs4_delegreturn_done,
3887         .rpc_release = nfs4_delegreturn_release,
3888 };
3889
3890 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3891 {
3892         struct nfs4_delegreturndata *data;
3893         struct nfs_server *server = NFS_SERVER(inode);
3894         struct rpc_task *task;
3895         struct rpc_message msg = {
3896                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3897                 .rpc_cred = cred,
3898         };
3899         struct rpc_task_setup task_setup_data = {
3900                 .rpc_client = server->client,
3901                 .rpc_message = &msg,
3902                 .callback_ops = &nfs4_delegreturn_ops,
3903                 .flags = RPC_TASK_ASYNC,
3904         };
3905         int status = 0;
3906
3907         data = kzalloc(sizeof(*data), GFP_NOFS);
3908         if (data == NULL)
3909                 return -ENOMEM;
3910         data->args.fhandle = &data->fh;
3911         data->args.stateid = &data->stateid;
3912         data->args.bitmask = server->attr_bitmask;
3913         nfs_copy_fh(&data->fh, NFS_FH(inode));
3914         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3915         data->res.fattr = &data->fattr;
3916         data->res.server = server;
3917         nfs_fattr_init(data->res.fattr);
3918         data->timestamp = jiffies;
3919         data->rpc_status = 0;
3920
3921         task_setup_data.callback_data = data;
3922         msg.rpc_argp = &data->args;
3923         msg.rpc_resp = &data->res;
3924         task = rpc_run_task(&task_setup_data);
3925         if (IS_ERR(task))
3926                 return PTR_ERR(task);
3927         if (!issync)
3928                 goto out;
3929         status = nfs4_wait_for_completion_rpc_task(task);
3930         if (status != 0)
3931                 goto out;
3932         status = data->rpc_status;
3933         if (status != 0)
3934                 goto out;
3935         nfs_refresh_inode(inode, &data->fattr);
3936 out:
3937         rpc_put_task(task);
3938         return status;
3939 }
3940
3941 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3942 {
3943         struct nfs_server *server = NFS_SERVER(inode);
3944         struct nfs4_exception exception = { };
3945         int err;
3946         do {
3947                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3948                 switch (err) {
3949                         case -NFS4ERR_STALE_STATEID:
3950                         case -NFS4ERR_EXPIRED:
3951                         case 0:
3952                                 return 0;
3953                 }
3954                 err = nfs4_handle_exception(server, err, &exception);
3955         } while (exception.retry);
3956         return err;
3957 }
3958
3959 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3960 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3961
3962 /*
3963  * sleep, with exponential backoff, and retry the LOCK operation.
3964  */
3965 static unsigned long
3966 nfs4_set_lock_task_retry(unsigned long timeout)
3967 {
3968         schedule_timeout_killable(timeout);
3969         timeout <<= 1;
3970         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3971                 return NFS4_LOCK_MAXTIMEOUT;
3972         return timeout;
3973 }
3974
3975 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3976 {
3977         struct inode *inode = state->inode;
3978         struct nfs_server *server = NFS_SERVER(inode);
3979         struct nfs_client *clp = server->nfs_client;
3980         struct nfs_lockt_args arg = {
3981                 .fh = NFS_FH(inode),
3982                 .fl = request,
3983         };
3984         struct nfs_lockt_res res = {
3985                 .denied = request,
3986         };
3987         struct rpc_message msg = {
3988                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3989                 .rpc_argp       = &arg,
3990                 .rpc_resp       = &res,
3991                 .rpc_cred       = state->owner->so_cred,
3992         };
3993         struct nfs4_lock_state *lsp;
3994         int status;
3995
3996         arg.lock_owner.clientid = clp->cl_clientid;
3997         status = nfs4_set_lock_state(state, request);
3998         if (status != 0)
3999                 goto out;
4000         lsp = request->fl_u.nfs4_fl.owner;
4001         arg.lock_owner.id = lsp->ls_id.id;
4002         arg.lock_owner.s_dev = server->s_dev;
4003         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4004         switch (status) {
4005                 case 0:
4006                         request->fl_type = F_UNLCK;
4007                         break;
4008                 case -NFS4ERR_DENIED:
4009                         status = 0;
4010         }
4011         request->fl_ops->fl_release_private(request);
4012 out:
4013         return status;
4014 }
4015
4016 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4017 {
4018         struct nfs4_exception exception = { };
4019         int err;
4020
4021         do {
4022                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4023                                 _nfs4_proc_getlk(state, cmd, request),
4024                                 &exception);
4025         } while (exception.retry);
4026         return err;
4027 }
4028
4029 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4030 {
4031         int res = 0;
4032         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4033                 case FL_POSIX:
4034                         res = posix_lock_file_wait(file, fl);
4035                         break;
4036                 case FL_FLOCK:
4037                         res = flock_lock_file_wait(file, fl);
4038                         break;
4039                 default:
4040                         BUG();
4041         }
4042         return res;
4043 }
4044
4045 struct nfs4_unlockdata {
4046         struct nfs_locku_args arg;
4047         struct nfs_locku_res res;
4048         struct nfs4_lock_state *lsp;
4049         struct nfs_open_context *ctx;
4050         struct file_lock fl;
4051         const struct nfs_server *server;
4052         unsigned long timestamp;
4053 };
4054
4055 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4056                 struct nfs_open_context *ctx,
4057                 struct nfs4_lock_state *lsp,
4058                 struct nfs_seqid *seqid)
4059 {
4060         struct nfs4_unlockdata *p;
4061         struct inode *inode = lsp->ls_state->inode;
4062
4063         p = kzalloc(sizeof(*p), GFP_NOFS);
4064         if (p == NULL)
4065                 return NULL;
4066         p->arg.fh = NFS_FH(inode);
4067         p->arg.fl = &p->fl;
4068         p->arg.seqid = seqid;
4069         p->res.seqid = seqid;
4070         p->arg.stateid = &lsp->ls_stateid;
4071         p->lsp = lsp;
4072         atomic_inc(&lsp->ls_count);
4073         /* Ensure we don't close file until we're done freeing locks! */
4074         p->ctx = get_nfs_open_context(ctx);
4075         memcpy(&p->fl, fl, sizeof(p->fl));
4076         p->server = NFS_SERVER(inode);
4077         return p;
4078 }
4079
4080 static void nfs4_locku_release_calldata(void *data)
4081 {
4082         struct nfs4_unlockdata *calldata = data;
4083         nfs_free_seqid(calldata->arg.seqid);
4084         nfs4_put_lock_state(calldata->lsp);
4085         put_nfs_open_context(calldata->ctx);
4086         kfree(calldata);
4087 }
4088
4089 static void nfs4_locku_done(struct rpc_task *task, void *data)
4090 {
4091         struct nfs4_unlockdata *calldata = data;
4092
4093         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4094                 return;
4095         switch (task->tk_status) {
4096                 case 0:
4097                         memcpy(calldata->lsp->ls_stateid.data,
4098                                         calldata->res.stateid.data,
4099                                         sizeof(calldata->lsp->ls_stateid.data));
4100                         renew_lease(calldata->server, calldata->timestamp);
4101                         break;
4102                 case -NFS4ERR_BAD_STATEID:
4103                 case -NFS4ERR_OLD_STATEID:
4104                 case -NFS4ERR_STALE_STATEID:
4105                 case -NFS4ERR_EXPIRED:
4106                         break;
4107                 default:
4108                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4109                                 nfs_restart_rpc(task,
4110                                                  calldata->server->nfs_client);
4111         }
4112 }
4113
4114 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4115 {
4116         struct nfs4_unlockdata *calldata = data;
4117
4118         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4119                 return;
4120         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4121                 /* Note: exit _without_ running nfs4_locku_done */
4122                 task->tk_action = NULL;
4123                 return;
4124         }
4125         calldata->timestamp = jiffies;
4126         if (nfs4_setup_sequence(calldata->server,
4127                                 &calldata->arg.seq_args,
4128                                 &calldata->res.seq_res, 1, task))
4129                 return;
4130         rpc_call_start(task);
4131 }
4132
4133 static const struct rpc_call_ops nfs4_locku_ops = {
4134         .rpc_call_prepare = nfs4_locku_prepare,
4135         .rpc_call_done = nfs4_locku_done,
4136         .rpc_release = nfs4_locku_release_calldata,
4137 };
4138
4139 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4140                 struct nfs_open_context *ctx,
4141                 struct nfs4_lock_state *lsp,
4142                 struct nfs_seqid *seqid)
4143 {
4144         struct nfs4_unlockdata *data;
4145         struct rpc_message msg = {
4146                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4147                 .rpc_cred = ctx->cred,
4148         };
4149         struct rpc_task_setup task_setup_data = {
4150                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4151                 .rpc_message = &msg,
4152                 .callback_ops = &nfs4_locku_ops,
4153                 .workqueue = nfsiod_workqueue,
4154                 .flags = RPC_TASK_ASYNC,
4155         };
4156
4157         /* Ensure this is an unlock - when canceling a lock, the
4158          * canceled lock is passed in, and it won't be an unlock.
4159          */
4160         fl->fl_type = F_UNLCK;
4161
4162         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4163         if (data == NULL) {
4164                 nfs_free_seqid(seqid);
4165                 return ERR_PTR(-ENOMEM);
4166         }
4167
4168         msg.rpc_argp = &data->arg;
4169         msg.rpc_resp = &data->res;
4170         task_setup_data.callback_data = data;
4171         return rpc_run_task(&task_setup_data);
4172 }
4173
4174 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4175 {
4176         struct nfs_inode *nfsi = NFS_I(state->inode);
4177         struct nfs_seqid *seqid;
4178         struct nfs4_lock_state *lsp;
4179         struct rpc_task *task;
4180         int status = 0;
4181         unsigned char fl_flags = request->fl_flags;
4182
4183         status = nfs4_set_lock_state(state, request);
4184         /* Unlock _before_ we do the RPC call */
4185         request->fl_flags |= FL_EXISTS;
4186         down_read(&nfsi->rwsem);
4187         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4188                 up_read(&nfsi->rwsem);
4189                 goto out;
4190         }
4191         up_read(&nfsi->rwsem);
4192         if (status != 0)
4193                 goto out;
4194         /* Is this a delegated lock? */
4195         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4196                 goto out;
4197         lsp = request->fl_u.nfs4_fl.owner;
4198         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4199         status = -ENOMEM;
4200         if (seqid == NULL)
4201                 goto out;
4202         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4203         status = PTR_ERR(task);
4204         if (IS_ERR(task))
4205                 goto out;
4206         status = nfs4_wait_for_completion_rpc_task(task);
4207         rpc_put_task(task);
4208 out:
4209         request->fl_flags = fl_flags;
4210         return status;
4211 }
4212
4213 struct nfs4_lockdata {
4214         struct nfs_lock_args arg;
4215         struct nfs_lock_res res;
4216         struct nfs4_lock_state *lsp;
4217         struct nfs_open_context *ctx;
4218         struct file_lock fl;
4219         unsigned long timestamp;
4220         int rpc_status;
4221         int cancelled;
4222         struct nfs_server *server;
4223 };
4224
4225 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4226                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4227                 gfp_t gfp_mask)
4228 {
4229         struct nfs4_lockdata *p;
4230         struct inode *inode = lsp->ls_state->inode;
4231         struct nfs_server *server = NFS_SERVER(inode);
4232
4233         p = kzalloc(sizeof(*p), gfp_mask);
4234         if (p == NULL)
4235                 return NULL;
4236
4237         p->arg.fh = NFS_FH(inode);
4238         p->arg.fl = &p->fl;
4239         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4240         if (p->arg.open_seqid == NULL)
4241                 goto out_free;
4242         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4243         if (p->arg.lock_seqid == NULL)
4244                 goto out_free_seqid;
4245         p->arg.lock_stateid = &lsp->ls_stateid;
4246         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4247         p->arg.lock_owner.id = lsp->ls_id.id;
4248         p->arg.lock_owner.s_dev = server->s_dev;
4249         p->res.lock_seqid = p->arg.lock_seqid;
4250         p->lsp = lsp;
4251         p->server = server;
4252         atomic_inc(&lsp->ls_count);
4253         p->ctx = get_nfs_open_context(ctx);
4254         memcpy(&p->fl, fl, sizeof(p->fl));
4255         return p;
4256 out_free_seqid:
4257         nfs_free_seqid(p->arg.open_seqid);
4258 out_free:
4259         kfree(p);
4260         return NULL;
4261 }
4262
4263 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4264 {
4265         struct nfs4_lockdata *data = calldata;
4266         struct nfs4_state *state = data->lsp->ls_state;
4267
4268         dprintk("%s: begin!\n", __func__);
4269         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4270                 return;
4271         /* Do we need to do an open_to_lock_owner? */
4272         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4273                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4274                         return;
4275                 data->arg.open_stateid = &state->stateid;
4276                 data->arg.new_lock_owner = 1;
4277                 data->res.open_seqid = data->arg.open_seqid;
4278         } else
4279                 data->arg.new_lock_owner = 0;
4280         data->timestamp = jiffies;
4281         if (nfs4_setup_sequence(data->server,
4282                                 &data->arg.seq_args,
4283                                 &data->res.seq_res, 1, task))
4284                 return;
4285         rpc_call_start(task);
4286         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4287 }
4288
4289 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4290 {
4291         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4292         nfs4_lock_prepare(task, calldata);
4293 }
4294
4295 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4296 {
4297         struct nfs4_lockdata *data = calldata;
4298
4299         dprintk("%s: begin!\n", __func__);
4300
4301         if (!nfs4_sequence_done(task, &data->res.seq_res))
4302                 return;
4303
4304         data->rpc_status = task->tk_status;
4305         if (data->arg.new_lock_owner != 0) {
4306                 if (data->rpc_status == 0)
4307                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4308                 else
4309                         goto out;
4310         }
4311         if (data->rpc_status == 0) {
4312                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4313                                         sizeof(data->lsp->ls_stateid.data));
4314                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4315                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4316         }
4317 out:
4318         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4319 }
4320
4321 static void nfs4_lock_release(void *calldata)
4322 {
4323         struct nfs4_lockdata *data = calldata;
4324
4325         dprintk("%s: begin!\n", __func__);
4326         nfs_free_seqid(data->arg.open_seqid);
4327         if (data->cancelled != 0) {
4328                 struct rpc_task *task;
4329                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4330                                 data->arg.lock_seqid);
4331                 if (!IS_ERR(task))
4332                         rpc_put_task_async(task);
4333                 dprintk("%s: cancelling lock!\n", __func__);
4334         } else
4335                 nfs_free_seqid(data->arg.lock_seqid);
4336         nfs4_put_lock_state(data->lsp);
4337         put_nfs_open_context(data->ctx);
4338         kfree(data);
4339         dprintk("%s: done!\n", __func__);
4340 }
4341
4342 static const struct rpc_call_ops nfs4_lock_ops = {
4343         .rpc_call_prepare = nfs4_lock_prepare,
4344         .rpc_call_done = nfs4_lock_done,
4345         .rpc_release = nfs4_lock_release,
4346 };
4347
4348 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4349         .rpc_call_prepare = nfs4_recover_lock_prepare,
4350         .rpc_call_done = nfs4_lock_done,
4351         .rpc_release = nfs4_lock_release,
4352 };
4353
4354 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4355 {
4356         switch (error) {
4357         case -NFS4ERR_ADMIN_REVOKED:
4358         case -NFS4ERR_BAD_STATEID:
4359                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4360                 if (new_lock_owner != 0 ||
4361                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4362                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4363                 break;
4364         case -NFS4ERR_STALE_STATEID:
4365                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4366         case -NFS4ERR_EXPIRED:
4367                 nfs4_schedule_lease_recovery(server->nfs_client);
4368         };
4369 }
4370
4371 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4372 {
4373         struct nfs4_lockdata *data;
4374         struct rpc_task *task;
4375         struct rpc_message msg = {
4376                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4377                 .rpc_cred = state->owner->so_cred,
4378         };
4379         struct rpc_task_setup task_setup_data = {
4380                 .rpc_client = NFS_CLIENT(state->inode),
4381                 .rpc_message = &msg,
4382                 .callback_ops = &nfs4_lock_ops,
4383                 .workqueue = nfsiod_workqueue,
4384                 .flags = RPC_TASK_ASYNC,
4385         };
4386         int ret;
4387
4388         dprintk("%s: begin!\n", __func__);
4389         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4390                         fl->fl_u.nfs4_fl.owner,
4391                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4392         if (data == NULL)
4393                 return -ENOMEM;
4394         if (IS_SETLKW(cmd))
4395                 data->arg.block = 1;
4396         if (recovery_type > NFS_LOCK_NEW) {
4397                 if (recovery_type == NFS_LOCK_RECLAIM)
4398                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4399                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4400         }
4401         msg.rpc_argp = &data->arg;
4402         msg.rpc_resp = &data->res;
4403         task_setup_data.callback_data = data;
4404         task = rpc_run_task(&task_setup_data);
4405         if (IS_ERR(task))
4406                 return PTR_ERR(task);
4407         ret = nfs4_wait_for_completion_rpc_task(task);
4408         if (ret == 0) {
4409                 ret = data->rpc_status;
4410                 if (ret)
4411                         nfs4_handle_setlk_error(data->server, data->lsp,
4412                                         data->arg.new_lock_owner, ret);
4413         } else
4414                 data->cancelled = 1;
4415         rpc_put_task(task);
4416         dprintk("%s: done, ret = %d!\n", __func__, ret);
4417         return ret;
4418 }
4419
4420 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4421 {
4422         struct nfs_server *server = NFS_SERVER(state->inode);
4423         struct nfs4_exception exception = { };
4424         int err;
4425
4426         do {
4427                 /* Cache the lock if possible... */
4428                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4429                         return 0;
4430                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4431                 if (err != -NFS4ERR_DELAY)
4432                         break;
4433                 nfs4_handle_exception(server, err, &exception);
4434         } while (exception.retry);
4435         return err;
4436 }
4437
4438 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4439 {
4440         struct nfs_server *server = NFS_SERVER(state->inode);
4441         struct nfs4_exception exception = { };
4442         int err;
4443
4444         err = nfs4_set_lock_state(state, request);
4445         if (err != 0)
4446                 return err;
4447         do {
4448                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4449                         return 0;
4450                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4451                 switch (err) {
4452                 default:
4453                         goto out;
4454                 case -NFS4ERR_GRACE:
4455                 case -NFS4ERR_DELAY:
4456                         nfs4_handle_exception(server, err, &exception);
4457                         err = 0;
4458                 }
4459         } while (exception.retry);
4460 out:
4461         return err;
4462 }
4463
4464 #if defined(CONFIG_NFS_V4_1)
4465 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4466 {
4467         int status;
4468         struct nfs_server *server = NFS_SERVER(state->inode);
4469
4470         status = nfs41_test_stateid(server, state);
4471         if (status == NFS_OK)
4472                 return 0;
4473         nfs41_free_stateid(server, state);
4474         return nfs4_lock_expired(state, request);
4475 }
4476 #endif
4477
4478 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4479 {
4480         struct nfs_inode *nfsi = NFS_I(state->inode);
4481         unsigned char fl_flags = request->fl_flags;
4482         int status = -ENOLCK;
4483
4484         if ((fl_flags & FL_POSIX) &&
4485                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4486                 goto out;
4487         /* Is this a delegated open? */
4488         status = nfs4_set_lock_state(state, request);
4489         if (status != 0)
4490                 goto out;
4491         request->fl_flags |= FL_ACCESS;
4492         status = do_vfs_lock(request->fl_file, request);
4493         if (status < 0)
4494                 goto out;
4495         down_read(&nfsi->rwsem);
4496         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4497                 /* Yes: cache locks! */
4498                 /* ...but avoid races with delegation recall... */
4499                 request->fl_flags = fl_flags & ~FL_SLEEP;
4500                 status = do_vfs_lock(request->fl_file, request);
4501                 goto out_unlock;
4502         }
4503         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4504         if (status != 0)
4505                 goto out_unlock;
4506         /* Note: we always want to sleep here! */
4507         request->fl_flags = fl_flags | FL_SLEEP;
4508         if (do_vfs_lock(request->fl_file, request) < 0)
4509                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4510 out_unlock:
4511         up_read(&nfsi->rwsem);
4512 out:
4513         request->fl_flags = fl_flags;
4514         return status;
4515 }
4516
4517 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4518 {
4519         struct nfs4_exception exception = { };
4520         int err;
4521
4522         do {
4523                 err = _nfs4_proc_setlk(state, cmd, request);
4524                 if (err == -NFS4ERR_DENIED)
4525                         err = -EAGAIN;
4526                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4527                                 err, &exception);
4528         } while (exception.retry);
4529         return err;
4530 }
4531
4532 static int
4533 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4534 {
4535         struct nfs_open_context *ctx;
4536         struct nfs4_state *state;
4537         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4538         int status;
4539
4540         /* verify open state */
4541         ctx = nfs_file_open_context(filp);
4542         state = ctx->state;
4543
4544         if (request->fl_start < 0 || request->fl_end < 0)
4545                 return -EINVAL;
4546
4547         if (IS_GETLK(cmd)) {
4548                 if (state != NULL)
4549                         return nfs4_proc_getlk(state, F_GETLK, request);
4550                 return 0;
4551         }
4552
4553         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4554                 return -EINVAL;
4555
4556         if (request->fl_type == F_UNLCK) {
4557                 if (state != NULL)
4558                         return nfs4_proc_unlck(state, cmd, request);
4559                 return 0;
4560         }
4561
4562         if (state == NULL)
4563                 return -ENOLCK;
4564         do {
4565                 status = nfs4_proc_setlk(state, cmd, request);
4566                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4567                         break;
4568                 timeout = nfs4_set_lock_task_retry(timeout);
4569                 status = -ERESTARTSYS;
4570                 if (signalled())
4571                         break;
4572         } while(status < 0);
4573         return status;
4574 }
4575
4576 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4577 {
4578         struct nfs_server *server = NFS_SERVER(state->inode);
4579         struct nfs4_exception exception = { };
4580         int err;
4581
4582         err = nfs4_set_lock_state(state, fl);
4583         if (err != 0)
4584                 goto out;
4585         do {
4586                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4587                 switch (err) {
4588                         default:
4589                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4590                                                 __func__, err);
4591                         case 0:
4592                         case -ESTALE:
4593                                 goto out;
4594                         case -NFS4ERR_EXPIRED:
4595                                 nfs4_schedule_stateid_recovery(server, state);
4596                         case -NFS4ERR_STALE_CLIENTID:
4597                         case -NFS4ERR_STALE_STATEID:
4598                                 nfs4_schedule_lease_recovery(server->nfs_client);
4599                                 goto out;
4600                         case -NFS4ERR_BADSESSION:
4601                         case -NFS4ERR_BADSLOT:
4602                         case -NFS4ERR_BAD_HIGH_SLOT:
4603                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4604                         case -NFS4ERR_DEADSESSION:
4605                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4606                                 goto out;
4607                         case -ERESTARTSYS:
4608                                 /*
4609                                  * The show must go on: exit, but mark the
4610                                  * stateid as needing recovery.
4611                                  */
4612                         case -NFS4ERR_ADMIN_REVOKED:
4613                         case -NFS4ERR_BAD_STATEID:
4614                         case -NFS4ERR_OPENMODE:
4615                                 nfs4_schedule_stateid_recovery(server, state);
4616                                 err = 0;
4617                                 goto out;
4618                         case -EKEYEXPIRED:
4619                                 /*
4620                                  * User RPCSEC_GSS context has expired.
4621                                  * We cannot recover this stateid now, so
4622                                  * skip it and allow recovery thread to
4623                                  * proceed.
4624                                  */
4625                                 err = 0;
4626                                 goto out;
4627                         case -ENOMEM:
4628                         case -NFS4ERR_DENIED:
4629                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4630                                 err = 0;
4631                                 goto out;
4632                         case -NFS4ERR_DELAY:
4633                                 break;
4634                 }
4635                 err = nfs4_handle_exception(server, err, &exception);
4636         } while (exception.retry);
4637 out:
4638         return err;
4639 }
4640
4641 static void nfs4_release_lockowner_release(void *calldata)
4642 {
4643         kfree(calldata);
4644 }
4645
4646 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4647         .rpc_release = nfs4_release_lockowner_release,
4648 };
4649
4650 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4651 {
4652         struct nfs_server *server = lsp->ls_state->owner->so_server;
4653         struct nfs_release_lockowner_args *args;
4654         struct rpc_message msg = {
4655                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4656         };
4657
4658         if (server->nfs_client->cl_mvops->minor_version != 0)
4659                 return;
4660         args = kmalloc(sizeof(*args), GFP_NOFS);
4661         if (!args)
4662                 return;
4663         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4664         args->lock_owner.id = lsp->ls_id.id;
4665         args->lock_owner.s_dev = server->s_dev;
4666         msg.rpc_argp = args;
4667         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4668 }
4669
4670 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4671
4672 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4673                                    const void *buf, size_t buflen,
4674                                    int flags, int type)
4675 {
4676         if (strcmp(key, "") != 0)
4677                 return -EINVAL;
4678
4679         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4680 }
4681
4682 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4683                                    void *buf, size_t buflen, int type)
4684 {
4685         if (strcmp(key, "") != 0)
4686                 return -EINVAL;
4687
4688         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4689 }
4690
4691 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4692                                        size_t list_len, const char *name,
4693                                        size_t name_len, int type)
4694 {
4695         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4696
4697         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4698                 return 0;
4699
4700         if (list && len <= list_len)
4701                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4702         return len;
4703 }
4704
4705 /*
4706  * nfs_fhget will use either the mounted_on_fileid or the fileid
4707  */
4708 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4709 {
4710         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4711                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4712               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4713               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4714                 return;
4715
4716         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4717                 NFS_ATTR_FATTR_NLINK;
4718         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4719         fattr->nlink = 2;
4720 }
4721
4722 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4723                 struct nfs4_fs_locations *fs_locations, struct page *page)
4724 {
4725         struct nfs_server *server = NFS_SERVER(dir);
4726         u32 bitmask[2] = {
4727                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4728         };
4729         struct nfs4_fs_locations_arg args = {
4730                 .dir_fh = NFS_FH(dir),
4731                 .name = name,
4732                 .page = page,
4733                 .bitmask = bitmask,
4734         };
4735         struct nfs4_fs_locations_res res = {
4736                 .fs_locations = fs_locations,
4737         };
4738         struct rpc_message msg = {
4739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4740                 .rpc_argp = &args,
4741                 .rpc_resp = &res,
4742         };
4743         int status;
4744
4745         dprintk("%s: start\n", __func__);
4746
4747         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4748          * is not supported */
4749         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4750                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4751         else
4752                 bitmask[0] |= FATTR4_WORD0_FILEID;
4753
4754         nfs_fattr_init(&fs_locations->fattr);
4755         fs_locations->server = server;
4756         fs_locations->nlocations = 0;
4757         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4758         dprintk("%s: returned status = %d\n", __func__, status);
4759         return status;
4760 }
4761
4762 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4763 {
4764         int status;
4765         struct nfs4_secinfo_arg args = {
4766                 .dir_fh = NFS_FH(dir),
4767                 .name   = name,
4768         };
4769         struct nfs4_secinfo_res res = {
4770                 .flavors     = flavors,
4771         };
4772         struct rpc_message msg = {
4773                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4774                 .rpc_argp = &args,
4775                 .rpc_resp = &res,
4776         };
4777
4778         dprintk("NFS call  secinfo %s\n", name->name);
4779         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4780         dprintk("NFS reply  secinfo: %d\n", status);
4781         return status;
4782 }
4783
4784 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4785 {
4786         struct nfs4_exception exception = { };
4787         int err;
4788         do {
4789                 err = nfs4_handle_exception(NFS_SERVER(dir),
4790                                 _nfs4_proc_secinfo(dir, name, flavors),
4791                                 &exception);
4792         } while (exception.retry);
4793         return err;
4794 }
4795
4796 #ifdef CONFIG_NFS_V4_1
4797 /*
4798  * Check the exchange flags returned by the server for invalid flags, having
4799  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4800  * DS flags set.
4801  */
4802 static int nfs4_check_cl_exchange_flags(u32 flags)
4803 {
4804         if (flags & ~EXCHGID4_FLAG_MASK_R)
4805                 goto out_inval;
4806         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4807             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4808                 goto out_inval;
4809         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4810                 goto out_inval;
4811         return NFS_OK;
4812 out_inval:
4813         return -NFS4ERR_INVAL;
4814 }
4815
4816 static bool
4817 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4818 {
4819         if (a->server_scope_sz == b->server_scope_sz &&
4820             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4821                 return true;
4822
4823         return false;
4824 }
4825
4826 /*
4827  * nfs4_proc_exchange_id()
4828  *
4829  * Since the clientid has expired, all compounds using sessions
4830  * associated with the stale clientid will be returning
4831  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4832  * be in some phase of session reset.
4833  */
4834 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4835 {
4836         nfs4_verifier verifier;
4837         struct nfs41_exchange_id_args args = {
4838                 .client = clp,
4839                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4840         };
4841         struct nfs41_exchange_id_res res = {
4842                 .client = clp,
4843         };
4844         int status;
4845         struct rpc_message msg = {
4846                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4847                 .rpc_argp = &args,
4848                 .rpc_resp = &res,
4849                 .rpc_cred = cred,
4850         };
4851         __be32 *p;
4852
4853         dprintk("--> %s\n", __func__);
4854         BUG_ON(clp == NULL);
4855
4856         p = (u32 *)verifier.data;
4857         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4858         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4859         args.verifier = &verifier;
4860
4861         args.id_len = scnprintf(args.id, sizeof(args.id),
4862                                 "%s/%s.%s/%u",
4863                                 clp->cl_ipaddr,
4864                                 init_utsname()->nodename,
4865                                 init_utsname()->domainname,
4866                                 clp->cl_rpcclient->cl_auth->au_flavor);
4867
4868         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4869         if (unlikely(!res.server_scope))
4870                 return -ENOMEM;
4871
4872         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4873         if (!status)
4874                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4875
4876         if (!status) {
4877                 if (clp->server_scope &&
4878                     !nfs41_same_server_scope(clp->server_scope,
4879                                              res.server_scope)) {
4880                         dprintk("%s: server_scope mismatch detected\n",
4881                                 __func__);
4882                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4883                         kfree(clp->server_scope);
4884                         clp->server_scope = NULL;
4885                 }
4886
4887                 if (!clp->server_scope)
4888                         clp->server_scope = res.server_scope;
4889                 else
4890                         kfree(res.server_scope);
4891         }
4892
4893         dprintk("<-- %s status= %d\n", __func__, status);
4894         return status;
4895 }
4896
4897 struct nfs4_get_lease_time_data {
4898         struct nfs4_get_lease_time_args *args;
4899         struct nfs4_get_lease_time_res *res;
4900         struct nfs_client *clp;
4901 };
4902
4903 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4904                                         void *calldata)
4905 {
4906         int ret;
4907         struct nfs4_get_lease_time_data *data =
4908                         (struct nfs4_get_lease_time_data *)calldata;
4909
4910         dprintk("--> %s\n", __func__);
4911         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4912         /* just setup sequence, do not trigger session recovery
4913            since we're invoked within one */
4914         ret = nfs41_setup_sequence(data->clp->cl_session,
4915                                    &data->args->la_seq_args,
4916                                    &data->res->lr_seq_res, 0, task);
4917
4918         BUG_ON(ret == -EAGAIN);
4919         rpc_call_start(task);
4920         dprintk("<-- %s\n", __func__);
4921 }
4922
4923 /*
4924  * Called from nfs4_state_manager thread for session setup, so don't recover
4925  * from sequence operation or clientid errors.
4926  */
4927 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4928 {
4929         struct nfs4_get_lease_time_data *data =
4930                         (struct nfs4_get_lease_time_data *)calldata;
4931
4932         dprintk("--> %s\n", __func__);
4933         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4934                 return;
4935         switch (task->tk_status) {
4936         case -NFS4ERR_DELAY:
4937         case -NFS4ERR_GRACE:
4938                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4939                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4940                 task->tk_status = 0;
4941                 /* fall through */
4942         case -NFS4ERR_RETRY_UNCACHED_REP:
4943                 nfs_restart_rpc(task, data->clp);
4944                 return;
4945         }
4946         dprintk("<-- %s\n", __func__);
4947 }
4948
4949 struct rpc_call_ops nfs4_get_lease_time_ops = {
4950         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4951         .rpc_call_done = nfs4_get_lease_time_done,
4952 };
4953
4954 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4955 {
4956         struct rpc_task *task;
4957         struct nfs4_get_lease_time_args args;
4958         struct nfs4_get_lease_time_res res = {
4959                 .lr_fsinfo = fsinfo,
4960         };
4961         struct nfs4_get_lease_time_data data = {
4962                 .args = &args,
4963                 .res = &res,
4964                 .clp = clp,
4965         };
4966         struct rpc_message msg = {
4967                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4968                 .rpc_argp = &args,
4969                 .rpc_resp = &res,
4970         };
4971         struct rpc_task_setup task_setup = {
4972                 .rpc_client = clp->cl_rpcclient,
4973                 .rpc_message = &msg,
4974                 .callback_ops = &nfs4_get_lease_time_ops,
4975                 .callback_data = &data,
4976                 .flags = RPC_TASK_TIMEOUT,
4977         };
4978         int status;
4979
4980         dprintk("--> %s\n", __func__);
4981         task = rpc_run_task(&task_setup);
4982
4983         if (IS_ERR(task))
4984                 status = PTR_ERR(task);
4985         else {
4986                 status = task->tk_status;
4987                 rpc_put_task(task);
4988         }
4989         dprintk("<-- %s return %d\n", __func__, status);
4990
4991         return status;
4992 }
4993
4994 /*
4995  * Reset a slot table
4996  */
4997 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4998                                  int ivalue)
4999 {
5000         struct nfs4_slot *new = NULL;
5001         int i;
5002         int ret = 0;
5003
5004         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5005                 max_reqs, tbl->max_slots);
5006
5007         /* Does the newly negotiated max_reqs match the existing slot table? */
5008         if (max_reqs != tbl->max_slots) {
5009                 ret = -ENOMEM;
5010                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
5011                               GFP_NOFS);
5012                 if (!new)
5013                         goto out;
5014                 ret = 0;
5015                 kfree(tbl->slots);
5016         }
5017         spin_lock(&tbl->slot_tbl_lock);
5018         if (new) {
5019                 tbl->slots = new;
5020                 tbl->max_slots = max_reqs;
5021         }
5022         for (i = 0; i < tbl->max_slots; ++i)
5023                 tbl->slots[i].seq_nr = ivalue;
5024         spin_unlock(&tbl->slot_tbl_lock);
5025         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5026                 tbl, tbl->slots, tbl->max_slots);
5027 out:
5028         dprintk("<-- %s: return %d\n", __func__, ret);
5029         return ret;
5030 }
5031
5032 /*
5033  * Reset the forechannel and backchannel slot tables
5034  */
5035 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5036 {
5037         int status;
5038
5039         status = nfs4_reset_slot_table(&session->fc_slot_table,
5040                         session->fc_attrs.max_reqs, 1);
5041         if (status)
5042                 return status;
5043
5044         status = nfs4_reset_slot_table(&session->bc_slot_table,
5045                         session->bc_attrs.max_reqs, 0);
5046         return status;
5047 }
5048
5049 /* Destroy the slot table */
5050 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5051 {
5052         if (session->fc_slot_table.slots != NULL) {
5053                 kfree(session->fc_slot_table.slots);
5054                 session->fc_slot_table.slots = NULL;
5055         }
5056         if (session->bc_slot_table.slots != NULL) {
5057                 kfree(session->bc_slot_table.slots);
5058                 session->bc_slot_table.slots = NULL;
5059         }
5060         return;
5061 }
5062
5063 /*
5064  * Initialize slot table
5065  */
5066 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5067                 int max_slots, int ivalue)
5068 {
5069         struct nfs4_slot *slot;
5070         int ret = -ENOMEM;
5071
5072         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5073
5074         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5075
5076         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5077         if (!slot)
5078                 goto out;
5079         ret = 0;
5080
5081         spin_lock(&tbl->slot_tbl_lock);
5082         tbl->max_slots = max_slots;
5083         tbl->slots = slot;
5084         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5085         spin_unlock(&tbl->slot_tbl_lock);
5086         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5087                 tbl, tbl->slots, tbl->max_slots);
5088 out:
5089         dprintk("<-- %s: return %d\n", __func__, ret);
5090         return ret;
5091 }
5092
5093 /*
5094  * Initialize the forechannel and backchannel tables
5095  */
5096 static int nfs4_init_slot_tables(struct nfs4_session *session)
5097 {
5098         struct nfs4_slot_table *tbl;
5099         int status = 0;
5100
5101         tbl = &session->fc_slot_table;
5102         if (tbl->slots == NULL) {
5103                 status = nfs4_init_slot_table(tbl,
5104                                 session->fc_attrs.max_reqs, 1);
5105                 if (status)
5106                         return status;
5107         }
5108
5109         tbl = &session->bc_slot_table;
5110         if (tbl->slots == NULL) {
5111                 status = nfs4_init_slot_table(tbl,
5112                                 session->bc_attrs.max_reqs, 0);
5113                 if (status)
5114                         nfs4_destroy_slot_tables(session);
5115         }
5116
5117         return status;
5118 }
5119
5120 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5121 {
5122         struct nfs4_session *session;
5123         struct nfs4_slot_table *tbl;
5124
5125         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5126         if (!session)
5127                 return NULL;
5128
5129         tbl = &session->fc_slot_table;
5130         tbl->highest_used_slotid = -1;
5131         spin_lock_init(&tbl->slot_tbl_lock);
5132         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5133         init_completion(&tbl->complete);
5134
5135         tbl = &session->bc_slot_table;
5136         tbl->highest_used_slotid = -1;
5137         spin_lock_init(&tbl->slot_tbl_lock);
5138         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5139         init_completion(&tbl->complete);
5140
5141         session->session_state = 1<<NFS4_SESSION_INITING;
5142
5143         session->clp = clp;
5144         return session;
5145 }
5146
5147 void nfs4_destroy_session(struct nfs4_session *session)
5148 {
5149         nfs4_proc_destroy_session(session);
5150         dprintk("%s Destroy backchannel for xprt %p\n",
5151                 __func__, session->clp->cl_rpcclient->cl_xprt);
5152         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5153                                 NFS41_BC_MIN_CALLBACKS);
5154         nfs4_destroy_slot_tables(session);
5155         kfree(session);
5156 }
5157
5158 /*
5159  * Initialize the values to be used by the client in CREATE_SESSION
5160  * If nfs4_init_session set the fore channel request and response sizes,
5161  * use them.
5162  *
5163  * Set the back channel max_resp_sz_cached to zero to force the client to
5164  * always set csa_cachethis to FALSE because the current implementation
5165  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5166  */
5167 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5168 {
5169         struct nfs4_session *session = args->client->cl_session;
5170         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5171                      mxresp_sz = session->fc_attrs.max_resp_sz;
5172
5173         if (mxrqst_sz == 0)
5174                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5175         if (mxresp_sz == 0)
5176                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5177         /* Fore channel attributes */
5178         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5179         args->fc_attrs.max_resp_sz = mxresp_sz;
5180         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5181         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5182
5183         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5184                 "max_ops=%u max_reqs=%u\n",
5185                 __func__,
5186                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5187                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5188
5189         /* Back channel attributes */
5190         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5191         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5192         args->bc_attrs.max_resp_sz_cached = 0;
5193         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5194         args->bc_attrs.max_reqs = 1;
5195
5196         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5197                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5198                 __func__,
5199                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5200                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5201                 args->bc_attrs.max_reqs);
5202 }
5203
5204 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5205 {
5206         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5207         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5208
5209         if (rcvd->max_resp_sz > sent->max_resp_sz)
5210                 return -EINVAL;
5211         /*
5212          * Our requested max_ops is the minimum we need; we're not
5213          * prepared to break up compounds into smaller pieces than that.
5214          * So, no point even trying to continue if the server won't
5215          * cooperate:
5216          */
5217         if (rcvd->max_ops < sent->max_ops)
5218                 return -EINVAL;
5219         if (rcvd->max_reqs == 0)
5220                 return -EINVAL;
5221         return 0;
5222 }
5223
5224 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5225 {
5226         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5227         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5228
5229         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5230                 return -EINVAL;
5231         if (rcvd->max_resp_sz < sent->max_resp_sz)
5232                 return -EINVAL;
5233         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5234                 return -EINVAL;
5235         /* These would render the backchannel useless: */
5236         if (rcvd->max_ops  == 0)
5237                 return -EINVAL;
5238         if (rcvd->max_reqs == 0)
5239                 return -EINVAL;
5240         return 0;
5241 }
5242
5243 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5244                                      struct nfs4_session *session)
5245 {
5246         int ret;
5247
5248         ret = nfs4_verify_fore_channel_attrs(args, session);
5249         if (ret)
5250                 return ret;
5251         return nfs4_verify_back_channel_attrs(args, session);
5252 }
5253
5254 static int _nfs4_proc_create_session(struct nfs_client *clp)
5255 {
5256         struct nfs4_session *session = clp->cl_session;
5257         struct nfs41_create_session_args args = {
5258                 .client = clp,
5259                 .cb_program = NFS4_CALLBACK,
5260         };
5261         struct nfs41_create_session_res res = {
5262                 .client = clp,
5263         };
5264         struct rpc_message msg = {
5265                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5266                 .rpc_argp = &args,
5267                 .rpc_resp = &res,
5268         };
5269         int status;
5270
5271         nfs4_init_channel_attrs(&args);
5272         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5273
5274         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5275
5276         if (!status)
5277                 /* Verify the session's negotiated channel_attrs values */
5278                 status = nfs4_verify_channel_attrs(&args, session);
5279         if (!status) {
5280                 /* Increment the clientid slot sequence id */
5281                 clp->cl_seqid++;
5282         }
5283
5284         return status;
5285 }
5286
5287 /*
5288  * Issues a CREATE_SESSION operation to the server.
5289  * It is the responsibility of the caller to verify the session is
5290  * expired before calling this routine.
5291  */
5292 int nfs4_proc_create_session(struct nfs_client *clp)
5293 {
5294         int status;
5295         unsigned *ptr;
5296         struct nfs4_session *session = clp->cl_session;
5297
5298         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5299
5300         status = _nfs4_proc_create_session(clp);
5301         if (status)
5302                 goto out;
5303
5304         /* Init and reset the fore channel */
5305         status = nfs4_init_slot_tables(session);
5306         dprintk("slot table initialization returned %d\n", status);
5307         if (status)
5308                 goto out;
5309         status = nfs4_reset_slot_tables(session);
5310         dprintk("slot table reset returned %d\n", status);
5311         if (status)
5312                 goto out;
5313
5314         ptr = (unsigned *)&session->sess_id.data[0];
5315         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5316                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5317 out:
5318         dprintk("<-- %s\n", __func__);
5319         return status;
5320 }
5321
5322 /*
5323  * Issue the over-the-wire RPC DESTROY_SESSION.
5324  * The caller must serialize access to this routine.
5325  */
5326 int nfs4_proc_destroy_session(struct nfs4_session *session)
5327 {
5328         int status = 0;
5329         struct rpc_message msg;
5330
5331         dprintk("--> nfs4_proc_destroy_session\n");
5332
5333         /* session is still being setup */
5334         if (session->clp->cl_cons_state != NFS_CS_READY)
5335                 return status;
5336
5337         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5338         msg.rpc_argp = session;
5339         msg.rpc_resp = NULL;
5340         msg.rpc_cred = NULL;
5341         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5342
5343         if (status)
5344                 printk(KERN_WARNING
5345                         "Got error %d from the server on DESTROY_SESSION. "
5346                         "Session has been destroyed regardless...\n", status);
5347
5348         dprintk("<-- nfs4_proc_destroy_session\n");
5349         return status;
5350 }
5351
5352 int nfs4_init_session(struct nfs_server *server)
5353 {
5354         struct nfs_client *clp = server->nfs_client;
5355         struct nfs4_session *session;
5356         unsigned int rsize, wsize;
5357         int ret;
5358
5359         if (!nfs4_has_session(clp))
5360                 return 0;
5361
5362         session = clp->cl_session;
5363         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5364                 return 0;
5365
5366         rsize = server->rsize;
5367         if (rsize == 0)
5368                 rsize = NFS_MAX_FILE_IO_SIZE;
5369         wsize = server->wsize;
5370         if (wsize == 0)
5371                 wsize = NFS_MAX_FILE_IO_SIZE;
5372
5373         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5374         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5375
5376         ret = nfs4_recover_expired_lease(server);
5377         if (!ret)
5378                 ret = nfs4_check_client_ready(clp);
5379         return ret;
5380 }
5381
5382 int nfs4_init_ds_session(struct nfs_client *clp)
5383 {
5384         struct nfs4_session *session = clp->cl_session;
5385         int ret;
5386
5387         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5388                 return 0;
5389
5390         ret = nfs4_client_recover_expired_lease(clp);
5391         if (!ret)
5392                 /* Test for the DS role */
5393                 if (!is_ds_client(clp))
5394                         ret = -ENODEV;
5395         if (!ret)
5396                 ret = nfs4_check_client_ready(clp);
5397         return ret;
5398
5399 }
5400 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5401
5402
5403 /*
5404  * Renew the cl_session lease.
5405  */
5406 struct nfs4_sequence_data {
5407         struct nfs_client *clp;
5408         struct nfs4_sequence_args args;
5409         struct nfs4_sequence_res res;
5410 };
5411
5412 static void nfs41_sequence_release(void *data)
5413 {
5414         struct nfs4_sequence_data *calldata = data;
5415         struct nfs_client *clp = calldata->clp;
5416
5417         if (atomic_read(&clp->cl_count) > 1)
5418                 nfs4_schedule_state_renewal(clp);
5419         nfs_put_client(clp);
5420         kfree(calldata);
5421 }
5422
5423 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5424 {
5425         switch(task->tk_status) {
5426         case -NFS4ERR_DELAY:
5427                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5428                 return -EAGAIN;
5429         default:
5430                 nfs4_schedule_lease_recovery(clp);
5431         }
5432         return 0;
5433 }
5434
5435 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5436 {
5437         struct nfs4_sequence_data *calldata = data;
5438         struct nfs_client *clp = calldata->clp;
5439
5440         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5441                 return;
5442
5443         if (task->tk_status < 0) {
5444                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5445                 if (atomic_read(&clp->cl_count) == 1)
5446                         goto out;
5447
5448                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5449                         rpc_restart_call_prepare(task);
5450                         return;
5451                 }
5452         }
5453         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5454 out:
5455         dprintk("<-- %s\n", __func__);
5456 }
5457
5458 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5459 {
5460         struct nfs4_sequence_data *calldata = data;
5461         struct nfs_client *clp = calldata->clp;
5462         struct nfs4_sequence_args *args;
5463         struct nfs4_sequence_res *res;
5464
5465         args = task->tk_msg.rpc_argp;
5466         res = task->tk_msg.rpc_resp;
5467
5468         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5469                 return;
5470         rpc_call_start(task);
5471 }
5472
5473 static const struct rpc_call_ops nfs41_sequence_ops = {
5474         .rpc_call_done = nfs41_sequence_call_done,
5475         .rpc_call_prepare = nfs41_sequence_prepare,
5476         .rpc_release = nfs41_sequence_release,
5477 };
5478
5479 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5480 {
5481         struct nfs4_sequence_data *calldata;
5482         struct rpc_message msg = {
5483                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5484                 .rpc_cred = cred,
5485         };
5486         struct rpc_task_setup task_setup_data = {
5487                 .rpc_client = clp->cl_rpcclient,
5488                 .rpc_message = &msg,
5489                 .callback_ops = &nfs41_sequence_ops,
5490                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5491         };
5492
5493         if (!atomic_inc_not_zero(&clp->cl_count))
5494                 return ERR_PTR(-EIO);
5495         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5496         if (calldata == NULL) {
5497                 nfs_put_client(clp);
5498                 return ERR_PTR(-ENOMEM);
5499         }
5500         msg.rpc_argp = &calldata->args;
5501         msg.rpc_resp = &calldata->res;
5502         calldata->clp = clp;
5503         task_setup_data.callback_data = calldata;
5504
5505         return rpc_run_task(&task_setup_data);
5506 }
5507
5508 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5509 {
5510         struct rpc_task *task;
5511         int ret = 0;
5512
5513         task = _nfs41_proc_sequence(clp, cred);
5514         if (IS_ERR(task))
5515                 ret = PTR_ERR(task);
5516         else
5517                 rpc_put_task_async(task);
5518         dprintk("<-- %s status=%d\n", __func__, ret);
5519         return ret;
5520 }
5521
5522 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5523 {
5524         struct rpc_task *task;
5525         int ret;
5526
5527         task = _nfs41_proc_sequence(clp, cred);
5528         if (IS_ERR(task)) {
5529                 ret = PTR_ERR(task);
5530                 goto out;
5531         }
5532         ret = rpc_wait_for_completion_task(task);
5533         if (!ret) {
5534                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5535
5536                 if (task->tk_status == 0)
5537                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5538                 ret = task->tk_status;
5539         }
5540         rpc_put_task(task);
5541 out:
5542         dprintk("<-- %s status=%d\n", __func__, ret);
5543         return ret;
5544 }
5545
5546 struct nfs4_reclaim_complete_data {
5547         struct nfs_client *clp;
5548         struct nfs41_reclaim_complete_args arg;
5549         struct nfs41_reclaim_complete_res res;
5550 };
5551
5552 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5553 {
5554         struct nfs4_reclaim_complete_data *calldata = data;
5555
5556         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5557         if (nfs41_setup_sequence(calldata->clp->cl_session,
5558                                 &calldata->arg.seq_args,
5559                                 &calldata->res.seq_res, 0, task))
5560                 return;
5561
5562         rpc_call_start(task);
5563 }
5564
5565 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5566 {
5567         switch(task->tk_status) {
5568         case 0:
5569         case -NFS4ERR_COMPLETE_ALREADY:
5570         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5571                 break;
5572         case -NFS4ERR_DELAY:
5573                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5574                 /* fall through */
5575         case -NFS4ERR_RETRY_UNCACHED_REP:
5576                 return -EAGAIN;
5577         default:
5578                 nfs4_schedule_lease_recovery(clp);
5579         }
5580         return 0;
5581 }
5582
5583 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5584 {
5585         struct nfs4_reclaim_complete_data *calldata = data;
5586         struct nfs_client *clp = calldata->clp;
5587         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5588
5589         dprintk("--> %s\n", __func__);
5590         if (!nfs41_sequence_done(task, res))
5591                 return;
5592
5593         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5594                 rpc_restart_call_prepare(task);
5595                 return;
5596         }
5597         dprintk("<-- %s\n", __func__);
5598 }
5599
5600 static void nfs4_free_reclaim_complete_data(void *data)
5601 {
5602         struct nfs4_reclaim_complete_data *calldata = data;
5603
5604         kfree(calldata);
5605 }
5606
5607 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5608         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5609         .rpc_call_done = nfs4_reclaim_complete_done,
5610         .rpc_release = nfs4_free_reclaim_complete_data,
5611 };
5612
5613 /*
5614  * Issue a global reclaim complete.
5615  */
5616 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5617 {
5618         struct nfs4_reclaim_complete_data *calldata;
5619         struct rpc_task *task;
5620         struct rpc_message msg = {
5621                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5622         };
5623         struct rpc_task_setup task_setup_data = {
5624                 .rpc_client = clp->cl_rpcclient,
5625                 .rpc_message = &msg,
5626                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5627                 .flags = RPC_TASK_ASYNC,
5628         };
5629         int status = -ENOMEM;
5630
5631         dprintk("--> %s\n", __func__);
5632         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5633         if (calldata == NULL)
5634                 goto out;
5635         calldata->clp = clp;
5636         calldata->arg.one_fs = 0;
5637
5638         msg.rpc_argp = &calldata->arg;
5639         msg.rpc_resp = &calldata->res;
5640         task_setup_data.callback_data = calldata;
5641         task = rpc_run_task(&task_setup_data);
5642         if (IS_ERR(task)) {
5643                 status = PTR_ERR(task);
5644                 goto out;
5645         }
5646         status = nfs4_wait_for_completion_rpc_task(task);
5647         if (status == 0)
5648                 status = task->tk_status;
5649         rpc_put_task(task);
5650         return 0;
5651 out:
5652         dprintk("<-- %s status=%d\n", __func__, status);
5653         return status;
5654 }
5655
5656 static void
5657 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5658 {
5659         struct nfs4_layoutget *lgp = calldata;
5660         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5661
5662         dprintk("--> %s\n", __func__);
5663         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5664          * right now covering the LAYOUTGET we are about to send.
5665          * However, that is not so catastrophic, and there seems
5666          * to be no way to prevent it completely.
5667          */
5668         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5669                                 &lgp->res.seq_res, 0, task))
5670                 return;
5671         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5672                                           NFS_I(lgp->args.inode)->layout,
5673                                           lgp->args.ctx->state)) {
5674                 rpc_exit(task, NFS4_OK);
5675                 return;
5676         }
5677         rpc_call_start(task);
5678 }
5679
5680 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5681 {
5682         struct nfs4_layoutget *lgp = calldata;
5683         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5684
5685         dprintk("--> %s\n", __func__);
5686
5687         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5688                 return;
5689
5690         switch (task->tk_status) {
5691         case 0:
5692                 break;
5693         case -NFS4ERR_LAYOUTTRYLATER:
5694         case -NFS4ERR_RECALLCONFLICT:
5695                 task->tk_status = -NFS4ERR_DELAY;
5696                 /* Fall through */
5697         default:
5698                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5699                         rpc_restart_call_prepare(task);
5700                         return;
5701                 }
5702         }
5703         dprintk("<-- %s\n", __func__);
5704 }
5705
5706 static void nfs4_layoutget_release(void *calldata)
5707 {
5708         struct nfs4_layoutget *lgp = calldata;
5709
5710         dprintk("--> %s\n", __func__);
5711         put_nfs_open_context(lgp->args.ctx);
5712         kfree(calldata);
5713         dprintk("<-- %s\n", __func__);
5714 }
5715
5716 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5717         .rpc_call_prepare = nfs4_layoutget_prepare,
5718         .rpc_call_done = nfs4_layoutget_done,
5719         .rpc_release = nfs4_layoutget_release,
5720 };
5721
5722 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5723 {
5724         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5725         struct rpc_task *task;
5726         struct rpc_message msg = {
5727                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5728                 .rpc_argp = &lgp->args,
5729                 .rpc_resp = &lgp->res,
5730         };
5731         struct rpc_task_setup task_setup_data = {
5732                 .rpc_client = server->client,
5733                 .rpc_message = &msg,
5734                 .callback_ops = &nfs4_layoutget_call_ops,
5735                 .callback_data = lgp,
5736                 .flags = RPC_TASK_ASYNC,
5737         };
5738         int status = 0;
5739
5740         dprintk("--> %s\n", __func__);
5741
5742         lgp->res.layoutp = &lgp->args.layout;
5743         lgp->res.seq_res.sr_slot = NULL;
5744         task = rpc_run_task(&task_setup_data);
5745         if (IS_ERR(task))
5746                 return PTR_ERR(task);
5747         status = nfs4_wait_for_completion_rpc_task(task);
5748         if (status == 0)
5749                 status = task->tk_status;
5750         if (status == 0)
5751                 status = pnfs_layout_process(lgp);
5752         rpc_put_task(task);
5753         dprintk("<-- %s status=%d\n", __func__, status);
5754         return status;
5755 }
5756
5757 static void
5758 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5759 {
5760         struct nfs4_layoutreturn *lrp = calldata;
5761
5762         dprintk("--> %s\n", __func__);
5763         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5764                                 &lrp->res.seq_res, 0, task))
5765                 return;
5766         rpc_call_start(task);
5767 }
5768
5769 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5770 {
5771         struct nfs4_layoutreturn *lrp = calldata;
5772         struct nfs_server *server;
5773         struct pnfs_layout_hdr *lo = lrp->args.layout;
5774
5775         dprintk("--> %s\n", __func__);
5776
5777         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5778                 return;
5779
5780         server = NFS_SERVER(lrp->args.inode);
5781         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5782                 nfs_restart_rpc(task, lrp->clp);
5783                 return;
5784         }
5785         spin_lock(&lo->plh_inode->i_lock);
5786         if (task->tk_status == 0) {
5787                 if (lrp->res.lrs_present) {
5788                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5789                 } else
5790                         BUG_ON(!list_empty(&lo->plh_segs));
5791         }
5792         lo->plh_block_lgets--;
5793         spin_unlock(&lo->plh_inode->i_lock);
5794         dprintk("<-- %s\n", __func__);
5795 }
5796
5797 static void nfs4_layoutreturn_release(void *calldata)
5798 {
5799         struct nfs4_layoutreturn *lrp = calldata;
5800
5801         dprintk("--> %s\n", __func__);
5802         put_layout_hdr(lrp->args.layout);
5803         kfree(calldata);
5804         dprintk("<-- %s\n", __func__);
5805 }
5806
5807 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5808         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5809         .rpc_call_done = nfs4_layoutreturn_done,
5810         .rpc_release = nfs4_layoutreturn_release,
5811 };
5812
5813 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5814 {
5815         struct rpc_task *task;
5816         struct rpc_message msg = {
5817                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5818                 .rpc_argp = &lrp->args,
5819                 .rpc_resp = &lrp->res,
5820         };
5821         struct rpc_task_setup task_setup_data = {
5822                 .rpc_client = lrp->clp->cl_rpcclient,
5823                 .rpc_message = &msg,
5824                 .callback_ops = &nfs4_layoutreturn_call_ops,
5825                 .callback_data = lrp,
5826         };
5827         int status;
5828
5829         dprintk("--> %s\n", __func__);
5830         task = rpc_run_task(&task_setup_data);
5831         if (IS_ERR(task))
5832                 return PTR_ERR(task);
5833         status = task->tk_status;
5834         dprintk("<-- %s status=%d\n", __func__, status);
5835         rpc_put_task(task);
5836         return status;
5837 }
5838
5839 static int
5840 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5841 {
5842         struct nfs4_getdeviceinfo_args args = {
5843                 .pdev = pdev,
5844         };
5845         struct nfs4_getdeviceinfo_res res = {
5846                 .pdev = pdev,
5847         };
5848         struct rpc_message msg = {
5849                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5850                 .rpc_argp = &args,
5851                 .rpc_resp = &res,
5852         };
5853         int status;
5854
5855         dprintk("--> %s\n", __func__);
5856         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5857         dprintk("<-- %s status=%d\n", __func__, status);
5858
5859         return status;
5860 }
5861
5862 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5863 {
5864         struct nfs4_exception exception = { };
5865         int err;
5866
5867         do {
5868                 err = nfs4_handle_exception(server,
5869                                         _nfs4_proc_getdeviceinfo(server, pdev),
5870                                         &exception);
5871         } while (exception.retry);
5872         return err;
5873 }
5874 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5875
5876 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5877 {
5878         struct nfs4_layoutcommit_data *data = calldata;
5879         struct nfs_server *server = NFS_SERVER(data->args.inode);
5880
5881         if (nfs4_setup_sequence(server, &data->args.seq_args,
5882                                 &data->res.seq_res, 1, task))
5883                 return;
5884         rpc_call_start(task);
5885 }
5886
5887 static void
5888 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5889 {
5890         struct nfs4_layoutcommit_data *data = calldata;
5891         struct nfs_server *server = NFS_SERVER(data->args.inode);
5892
5893         if (!nfs4_sequence_done(task, &data->res.seq_res))
5894                 return;
5895
5896         switch (task->tk_status) { /* Just ignore these failures */
5897         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5898         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5899         case NFS4ERR_BADLAYOUT:     /* no layout */
5900         case NFS4ERR_GRACE:         /* loca_recalim always false */
5901                 task->tk_status = 0;
5902         }
5903
5904         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5905                 nfs_restart_rpc(task, server->nfs_client);
5906                 return;
5907         }
5908
5909         if (task->tk_status == 0)
5910                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5911                                                    data->res.fattr);
5912 }
5913
5914 static void nfs4_layoutcommit_release(void *calldata)
5915 {
5916         struct nfs4_layoutcommit_data *data = calldata;
5917
5918         /* Matched by references in pnfs_set_layoutcommit */
5919         put_lseg(data->lseg);
5920         put_rpccred(data->cred);
5921         kfree(data);
5922 }
5923
5924 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5925         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5926         .rpc_call_done = nfs4_layoutcommit_done,
5927         .rpc_release = nfs4_layoutcommit_release,
5928 };
5929
5930 int
5931 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5932 {
5933         struct rpc_message msg = {
5934                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5935                 .rpc_argp = &data->args,
5936                 .rpc_resp = &data->res,
5937                 .rpc_cred = data->cred,
5938         };
5939         struct rpc_task_setup task_setup_data = {
5940                 .task = &data->task,
5941                 .rpc_client = NFS_CLIENT(data->args.inode),
5942                 .rpc_message = &msg,
5943                 .callback_ops = &nfs4_layoutcommit_ops,
5944                 .callback_data = data,
5945                 .flags = RPC_TASK_ASYNC,
5946         };
5947         struct rpc_task *task;
5948         int status = 0;
5949
5950         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5951                 "lbw: %llu inode %lu\n",
5952                 data->task.tk_pid, sync,
5953                 data->args.lastbytewritten,
5954                 data->args.inode->i_ino);
5955
5956         task = rpc_run_task(&task_setup_data);
5957         if (IS_ERR(task))
5958                 return PTR_ERR(task);
5959         if (sync == false)
5960                 goto out;
5961         status = nfs4_wait_for_completion_rpc_task(task);
5962         if (status != 0)
5963                 goto out;
5964         status = task->tk_status;
5965 out:
5966         dprintk("%s: status %d\n", __func__, status);
5967         rpc_put_task(task);
5968         return status;
5969 }
5970
5971 static int
5972 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
5973                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
5974 {
5975         struct nfs41_secinfo_no_name_args args = {
5976                 .style = SECINFO_STYLE_CURRENT_FH,
5977         };
5978         struct nfs4_secinfo_res res = {
5979                 .flavors = flavors,
5980         };
5981         struct rpc_message msg = {
5982                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
5983                 .rpc_argp = &args,
5984                 .rpc_resp = &res,
5985         };
5986         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5987 }
5988
5989 static int
5990 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
5991                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
5992 {
5993         struct nfs4_exception exception = { };
5994         int err;
5995         do {
5996                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
5997                 switch (err) {
5998                 case 0:
5999                 case -NFS4ERR_WRONGSEC:
6000                 case -NFS4ERR_NOTSUPP:
6001                         break;
6002                 default:
6003                         err = nfs4_handle_exception(server, err, &exception);
6004                 }
6005         } while (exception.retry);
6006         return err;
6007 }
6008
6009 static int
6010 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6011                     struct nfs_fsinfo *info)
6012 {
6013         int err;
6014         struct page *page;
6015         rpc_authflavor_t flavor;
6016         struct nfs4_secinfo_flavors *flavors;
6017
6018         page = alloc_page(GFP_KERNEL);
6019         if (!page) {
6020                 err = -ENOMEM;
6021                 goto out;
6022         }
6023
6024         flavors = page_address(page);
6025         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6026
6027         /*
6028          * Fall back on "guess and check" method if
6029          * the server doesn't support SECINFO_NO_NAME
6030          */
6031         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6032                 err = nfs4_find_root_sec(server, fhandle, info);
6033                 goto out_freepage;
6034         }
6035         if (err)
6036                 goto out_freepage;
6037
6038         flavor = nfs_find_best_sec(flavors);
6039         if (err == 0)
6040                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6041
6042 out_freepage:
6043         put_page(page);
6044         if (err == -EACCES)
6045                 return -EPERM;
6046 out:
6047         return err;
6048 }
6049 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6050 {
6051         int status;
6052         struct nfs41_test_stateid_args args = {
6053                 .stateid = &state->stateid,
6054         };
6055         struct nfs41_test_stateid_res res;
6056         struct rpc_message msg = {
6057                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6058                 .rpc_argp = &args,
6059                 .rpc_resp = &res,
6060         };
6061         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6062         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6063         return status;
6064 }
6065
6066 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6067 {
6068         struct nfs4_exception exception = { };
6069         int err;
6070         do {
6071                 err = nfs4_handle_exception(server,
6072                                 _nfs41_test_stateid(server, state),
6073                                 &exception);
6074         } while (exception.retry);
6075         return err;
6076 }
6077
6078 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6079 {
6080         int status;
6081         struct nfs41_free_stateid_args args = {
6082                 .stateid = &state->stateid,
6083         };
6084         struct nfs41_free_stateid_res res;
6085         struct rpc_message msg = {
6086                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6087                 .rpc_argp = &args,
6088                 .rpc_resp = &res,
6089         };
6090
6091         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6092         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6093         return status;
6094 }
6095
6096 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6097 {
6098         struct nfs4_exception exception = { };
6099         int err;
6100         do {
6101                 err = nfs4_handle_exception(server,
6102                                 _nfs4_free_stateid(server, state),
6103                                 &exception);
6104         } while (exception.retry);
6105         return err;
6106 }
6107 #endif /* CONFIG_NFS_V4_1 */
6108
6109 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6110         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6111         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6112         .recover_open   = nfs4_open_reclaim,
6113         .recover_lock   = nfs4_lock_reclaim,
6114         .establish_clid = nfs4_init_clientid,
6115         .get_clid_cred  = nfs4_get_setclientid_cred,
6116 };
6117
6118 #if defined(CONFIG_NFS_V4_1)
6119 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6120         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6121         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6122         .recover_open   = nfs4_open_reclaim,
6123         .recover_lock   = nfs4_lock_reclaim,
6124         .establish_clid = nfs41_init_clientid,
6125         .get_clid_cred  = nfs4_get_exchange_id_cred,
6126         .reclaim_complete = nfs41_proc_reclaim_complete,
6127 };
6128 #endif /* CONFIG_NFS_V4_1 */
6129
6130 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6131         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6132         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6133         .recover_open   = nfs4_open_expired,
6134         .recover_lock   = nfs4_lock_expired,
6135         .establish_clid = nfs4_init_clientid,
6136         .get_clid_cred  = nfs4_get_setclientid_cred,
6137 };
6138
6139 #if defined(CONFIG_NFS_V4_1)
6140 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6141         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6142         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6143         .recover_open   = nfs41_open_expired,
6144         .recover_lock   = nfs41_lock_expired,
6145         .establish_clid = nfs41_init_clientid,
6146         .get_clid_cred  = nfs4_get_exchange_id_cred,
6147 };
6148 #endif /* CONFIG_NFS_V4_1 */
6149
6150 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6151         .sched_state_renewal = nfs4_proc_async_renew,
6152         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6153         .renew_lease = nfs4_proc_renew,
6154 };
6155
6156 #if defined(CONFIG_NFS_V4_1)
6157 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6158         .sched_state_renewal = nfs41_proc_async_sequence,
6159         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6160         .renew_lease = nfs4_proc_sequence,
6161 };
6162 #endif
6163
6164 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6165         .minor_version = 0,
6166         .call_sync = _nfs4_call_sync,
6167         .validate_stateid = nfs4_validate_delegation_stateid,
6168         .find_root_sec = nfs4_find_root_sec,
6169         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6170         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6171         .state_renewal_ops = &nfs40_state_renewal_ops,
6172 };
6173
6174 #if defined(CONFIG_NFS_V4_1)
6175 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6176         .minor_version = 1,
6177         .call_sync = _nfs4_call_sync_session,
6178         .validate_stateid = nfs41_validate_delegation_stateid,
6179         .find_root_sec = nfs41_find_root_sec,
6180         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6181         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6182         .state_renewal_ops = &nfs41_state_renewal_ops,
6183 };
6184 #endif
6185
6186 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6187         [0] = &nfs_v4_0_minor_ops,
6188 #if defined(CONFIG_NFS_V4_1)
6189         [1] = &nfs_v4_1_minor_ops,
6190 #endif
6191 };
6192
6193 static const struct inode_operations nfs4_file_inode_operations = {
6194         .permission     = nfs_permission,
6195         .getattr        = nfs_getattr,
6196         .setattr        = nfs_setattr,
6197         .getxattr       = generic_getxattr,
6198         .setxattr       = generic_setxattr,
6199         .listxattr      = generic_listxattr,
6200         .removexattr    = generic_removexattr,
6201 };
6202
6203 const struct nfs_rpc_ops nfs_v4_clientops = {
6204         .version        = 4,                    /* protocol version */
6205         .dentry_ops     = &nfs4_dentry_operations,
6206         .dir_inode_ops  = &nfs4_dir_inode_operations,
6207         .file_inode_ops = &nfs4_file_inode_operations,
6208         .getroot        = nfs4_proc_get_root,
6209         .getattr        = nfs4_proc_getattr,
6210         .setattr        = nfs4_proc_setattr,
6211         .lookupfh       = nfs4_proc_lookupfh,
6212         .lookup         = nfs4_proc_lookup,
6213         .access         = nfs4_proc_access,
6214         .readlink       = nfs4_proc_readlink,
6215         .create         = nfs4_proc_create,
6216         .remove         = nfs4_proc_remove,
6217         .unlink_setup   = nfs4_proc_unlink_setup,
6218         .unlink_done    = nfs4_proc_unlink_done,
6219         .rename         = nfs4_proc_rename,
6220         .rename_setup   = nfs4_proc_rename_setup,
6221         .rename_done    = nfs4_proc_rename_done,
6222         .link           = nfs4_proc_link,
6223         .symlink        = nfs4_proc_symlink,
6224         .mkdir          = nfs4_proc_mkdir,
6225         .rmdir          = nfs4_proc_remove,
6226         .readdir        = nfs4_proc_readdir,
6227         .mknod          = nfs4_proc_mknod,
6228         .statfs         = nfs4_proc_statfs,
6229         .fsinfo         = nfs4_proc_fsinfo,
6230         .pathconf       = nfs4_proc_pathconf,
6231         .set_capabilities = nfs4_server_capabilities,
6232         .decode_dirent  = nfs4_decode_dirent,
6233         .read_setup     = nfs4_proc_read_setup,
6234         .read_done      = nfs4_read_done,
6235         .write_setup    = nfs4_proc_write_setup,
6236         .write_done     = nfs4_write_done,
6237         .commit_setup   = nfs4_proc_commit_setup,
6238         .commit_done    = nfs4_commit_done,
6239         .lock           = nfs4_proc_lock,
6240         .clear_acl_cache = nfs4_zap_acl_attr,
6241         .close_context  = nfs4_close_context,
6242         .open_context   = nfs4_atomic_open,
6243         .init_client    = nfs4_init_client,
6244         .secinfo        = nfs4_proc_secinfo,
6245 };
6246
6247 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6248         .prefix = XATTR_NAME_NFSV4_ACL,
6249         .list   = nfs4_xattr_list_nfs4_acl,
6250         .get    = nfs4_xattr_get_nfs4_acl,
6251         .set    = nfs4_xattr_set_nfs4_acl,
6252 };
6253
6254 const struct xattr_handler *nfs4_xattr_handlers[] = {
6255         &nfs4_xattr_nfs4_acl_handler,
6256         NULL
6257 };
6258
6259 /*
6260  * Local variables:
6261  *  c-basic-offset: 8
6262  * End:
6263  */