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_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  77 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  78                             struct nfs_fattr *fattr, struct iattr *sattr,
  79                             struct nfs4_state *state);
  80 #ifdef CONFIG_NFS_V4_1
  81 static int nfs41_test_stateid(struct nfs_server *, struct nfs4_state *);
  82 static int nfs41_free_stateid(struct nfs_server *, struct nfs4_state *);
  83 #endif
  84 /* Prevent leaks of NFSv4 errors into userland */
  85 static int nfs4_map_errors(int err)
  86 {
  87         if (err >= -1000)
  88                 return err;
  89         switch (err) {
  90         case -NFS4ERR_RESOURCE:
  91                 return -EREMOTEIO;
  92         case -NFS4ERR_WRONGSEC:
  93                 return -EPERM;
  94         case -NFS4ERR_BADOWNER:
  95         case -NFS4ERR_BADNAME:
  96                 return -EINVAL;
  97         default:
  98                 dprintk("%s could not handle NFSv4 error %d\n",
  99                                 __func__, -err);
 100                 break;
 101         }
 102         return -EIO;
 103 }
 104
 105 /*
 106  * This is our standard bitmap for GETATTR requests.
 107  */
 108 const u32 nfs4_fattr_bitmap[2] = {
 109         FATTR4_WORD0_TYPE
 110         | FATTR4_WORD0_CHANGE
 111         | FATTR4_WORD0_SIZE
 112         | FATTR4_WORD0_FSID
 113         | FATTR4_WORD0_FILEID,
 114         FATTR4_WORD1_MODE
 115         | FATTR4_WORD1_NUMLINKS
 116         | FATTR4_WORD1_OWNER
 117         | FATTR4_WORD1_OWNER_GROUP
 118         | FATTR4_WORD1_RAWDEV
 119         | FATTR4_WORD1_SPACE_USED
 120         | FATTR4_WORD1_TIME_ACCESS
 121         | FATTR4_WORD1_TIME_METADATA
 122         | FATTR4_WORD1_TIME_MODIFY
 123 };
 124
 125 const u32 nfs4_statfs_bitmap[2] = {
 126         FATTR4_WORD0_FILES_AVAIL
 127         | FATTR4_WORD0_FILES_FREE
 128         | FATTR4_WORD0_FILES_TOTAL,
 129         FATTR4_WORD1_SPACE_AVAIL
 130         | FATTR4_WORD1_SPACE_FREE
 131         | FATTR4_WORD1_SPACE_TOTAL
 132 };
 133
 134 const u32 nfs4_pathconf_bitmap[2] = {
 135         FATTR4_WORD0_MAXLINK
 136         | FATTR4_WORD0_MAXNAME,
 137         0
 138 };
 139
 140 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 141                         | FATTR4_WORD0_MAXREAD
 142                         | FATTR4_WORD0_MAXWRITE
 143                         | FATTR4_WORD0_LEASE_TIME,
 144                         FATTR4_WORD1_TIME_DELTA
 145                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 146                         FATTR4_WORD2_LAYOUT_BLKSIZE
 147 };
 148
 149 const u32 nfs4_fs_locations_bitmap[2] = {
 150         FATTR4_WORD0_TYPE
 151         | FATTR4_WORD0_CHANGE
 152         | FATTR4_WORD0_SIZE
 153         | FATTR4_WORD0_FSID
 154         | FATTR4_WORD0_FILEID
 155         | FATTR4_WORD0_FS_LOCATIONS,
 156         FATTR4_WORD1_MODE
 157         | FATTR4_WORD1_NUMLINKS
 158         | FATTR4_WORD1_OWNER
 159         | FATTR4_WORD1_OWNER_GROUP
 160         | FATTR4_WORD1_RAWDEV
 161         | FATTR4_WORD1_SPACE_USED
 162         | FATTR4_WORD1_TIME_ACCESS
 163         | FATTR4_WORD1_TIME_METADATA
 164         | FATTR4_WORD1_TIME_MODIFY
 165         | FATTR4_WORD1_MOUNTED_ON_FILEID
 166 };
 167
 168 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 169                 struct nfs4_readdir_arg *readdir)
 170 {
 171         __be32 *start, *p;
 172
 173         BUG_ON(readdir->count < 80);
 174         if (cookie > 2) {
 175                 readdir->cookie = cookie;
 176                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 177                 return;
 178         }
 179
 180         readdir->cookie = 0;
 181         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 182         if (cookie == 2)
 183                 return;
 184
 185         /*
 186          * NFSv4 servers do not return entries for '.' and '..'
 187          * Therefore, we fake these entries here.  We let '.'
 188          * have cookie 0 and '..' have cookie 1.  Note that
 189          * when talking to the server, we always send cookie 0
 190          * instead of 1 or 2.
 191          */
 192         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 193
 194         if (cookie == 0) {
 195                 *p++ = xdr_one;                                  /* next */
 196                 *p++ = xdr_zero;                   /* cookie, first word */
 197                 *p++ = xdr_one;                   /* cookie, second word */
 198                 *p++ = xdr_one;                             /* entry len */
 199                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 200                 p++;
 201                 *p++ = xdr_one;                         /* bitmap length */
 202                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 203                 *p++ = htonl(8);              /* attribute buffer length */
 204                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 205         }
 206
 207         *p++ = xdr_one;                                  /* next */
 208         *p++ = xdr_zero;                   /* cookie, first word */
 209         *p++ = xdr_two;                   /* cookie, second word */
 210         *p++ = xdr_two;                             /* entry len */
 211         memcpy(p, "..\0\0", 4);                         /* entry */
 212         p++;
 213         *p++ = xdr_one;                         /* bitmap length */
 214         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 215         *p++ = htonl(8);              /* attribute buffer length */
 216         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 217
 218         readdir->pgbase = (char *)p - (char *)start;
 219         readdir->count -= readdir->pgbase;
 220         kunmap_atomic(start, KM_USER0);
 221 }
 222
 223 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 224 {
 225         int res;
 226
 227         might_sleep();
 228
 229         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 230                         nfs_wait_bit_killable, TASK_KILLABLE);
 231         return res;
 232 }
 233
 234 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 235 {
 236         int res = 0;
 237
 238         might_sleep();
 239
 240         if (*timeout <= 0)
 241                 *timeout = NFS4_POLL_RETRY_MIN;
 242         if (*timeout > NFS4_POLL_RETRY_MAX)
 243                 *timeout = NFS4_POLL_RETRY_MAX;
 244         schedule_timeout_killable(*timeout);
 245         if (fatal_signal_pending(current))
 246                 res = -ERESTARTSYS;
 247         *timeout <<= 1;
 248         return res;
 249 }
 250
 251 /* This is the error handling routine for processes that are allowed
 252  * to sleep.
 253  */
 254 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 255 {
 256         struct nfs_client *clp = server->nfs_client;
 257         struct nfs4_state *state = exception->state;
 258         int ret = errorcode;
 259
 260         exception->retry = 0;
 261         switch(errorcode) {
 262                 case 0:
 263                         return 0;
 264                 case -NFS4ERR_ADMIN_REVOKED:
 265                 case -NFS4ERR_BAD_STATEID:
 266                 case -NFS4ERR_OPENMODE:
 267                         if (state == NULL)
 268                                 break;
 269                         nfs4_schedule_stateid_recovery(server, state);
 270                         goto wait_on_recovery;
 271                 case -NFS4ERR_EXPIRED:
 272                         if (state != NULL)
 273                                 nfs4_schedule_stateid_recovery(server, state);
 274                 case -NFS4ERR_STALE_STATEID:
 275                 case -NFS4ERR_STALE_CLIENTID:
 276                         nfs4_schedule_lease_recovery(clp);
 277                         goto wait_on_recovery;
 278 #if defined(CONFIG_NFS_V4_1)
 279                 case -NFS4ERR_BADSESSION:
 280                 case -NFS4ERR_BADSLOT:
 281                 case -NFS4ERR_BAD_HIGH_SLOT:
 282                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 283                 case -NFS4ERR_DEADSESSION:
 284                 case -NFS4ERR_SEQ_FALSE_RETRY:
 285                 case -NFS4ERR_SEQ_MISORDERED:
 286                         dprintk("%s ERROR: %d Reset session\n", __func__,
 287                                 errorcode);
 288                         nfs4_schedule_session_recovery(clp->cl_session);
 289                         exception->retry = 1;
 290                         break;
 291 #endif /* defined(CONFIG_NFS_V4_1) */
 292                 case -NFS4ERR_FILE_OPEN:
 293                         if (exception->timeout > HZ) {
 294                                 /* We have retried a decent amount, time to
 295                                  * fail
 296                                  */
 297                                 ret = -EBUSY;
 298                                 break;
 299                         }
 300                 case -NFS4ERR_GRACE:
 301                 case -NFS4ERR_DELAY:
 302                 case -EKEYEXPIRED:
 303                         ret = nfs4_delay(server->client, &exception->timeout);
 304                         if (ret != 0)
 305                                 break;
 306                 case -NFS4ERR_RETRY_UNCACHED_REP:
 307                 case -NFS4ERR_OLD_STATEID:
 308                         exception->retry = 1;
 309                         break;
 310                 case -NFS4ERR_BADOWNER:
 311                         /* The following works around a Linux server bug! */
 312                 case -NFS4ERR_BADNAME:
 313                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 314                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 315                                 exception->retry = 1;
 316                                 printk(KERN_WARNING "NFS: v4 server %s "
 317                                                 "does not accept raw "
 318                                                 "uid/gids. "
 319                                                 "Reenabling the idmapper.\n",
 320                                                 server->nfs_client->cl_hostname);
 321                         }
 322         }
 323         /* We failed to handle the error */
 324         return nfs4_map_errors(ret);
 325 wait_on_recovery:
 326         ret = nfs4_wait_clnt_recover(clp);
 327         if (ret == 0)
 328                 exception->retry = 1;
 329         return ret;
 330 }
 331
 332
 333 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 334 {
 335         spin_lock(&clp->cl_lock);
 336         if (time_before(clp->cl_last_renewal,timestamp))
 337                 clp->cl_last_renewal = timestamp;
 338         spin_unlock(&clp->cl_lock);
 339 }
 340
 341 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 342 {
 343         do_renew_lease(server->nfs_client, timestamp);
 344 }
 345
 346 #if defined(CONFIG_NFS_V4_1)
 347
 348 /*
 349  * nfs4_free_slot - free a slot and efficiently update slot table.
 350  *
 351  * freeing a slot is trivially done by clearing its respective bit
 352  * in the bitmap.
 353  * If the freed slotid equals highest_used_slotid we want to update it
 354  * so that the server would be able to size down the slot table if needed,
 355  * otherwise we know that the highest_used_slotid is still in use.
 356  * When updating highest_used_slotid there may be "holes" in the bitmap
 357  * so we need to scan down from highest_used_slotid to 0 looking for the now
 358  * highest slotid in use.
 359  * If none found, highest_used_slotid is set to -1.
 360  *
 361  * Must be called while holding tbl->slot_tbl_lock
 362  */
 363 static void
 364 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 365 {
 366         int free_slotid = free_slot - tbl->slots;
 367         int slotid = free_slotid;
 368
 369         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 370         /* clear used bit in bitmap */
 371         __clear_bit(slotid, tbl->used_slots);
 372
 373         /* update highest_used_slotid when it is freed */
 374         if (slotid == tbl->highest_used_slotid) {
 375                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 376                 if (slotid < tbl->max_slots)
 377                         tbl->highest_used_slotid = slotid;
 378                 else
 379                         tbl->highest_used_slotid = -1;
 380         }
 381         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 382                 free_slotid, tbl->highest_used_slotid);
 383 }
 384
 385 /*
 386  * Signal state manager thread if session fore channel is drained
 387  */
 388 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 389 {
 390         struct rpc_task *task;
 391
 392         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 393                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 394                 if (task)
 395                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 396                 return;
 397         }
 398
 399         if (ses->fc_slot_table.highest_used_slotid != -1)
 400                 return;
 401
 402         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 403         complete(&ses->fc_slot_table.complete);
 404 }
 405
 406 /*
 407  * Signal state manager thread if session back channel is drained
 408  */
 409 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 410 {
 411         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 412             ses->bc_slot_table.highest_used_slotid != -1)
 413                 return;
 414         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 415         complete(&ses->bc_slot_table.complete);
 416 }
 417
 418 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 419 {
 420         struct nfs4_slot_table *tbl;
 421
 422         tbl = &res->sr_session->fc_slot_table;
 423         if (!res->sr_slot) {
 424                 /* just wake up the next guy waiting since
 425                  * we may have not consumed a slot after all */
 426                 dprintk("%s: No slot\n", __func__);
 427                 return;
 428         }
 429
 430         spin_lock(&tbl->slot_tbl_lock);
 431         nfs4_free_slot(tbl, res->sr_slot);
 432         nfs4_check_drain_fc_complete(res->sr_session);
 433         spin_unlock(&tbl->slot_tbl_lock);
 434         res->sr_slot = NULL;
 435 }
 436
 437 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 438 {
 439         unsigned long timestamp;
 440         struct nfs_client *clp;
 441
 442         /*
 443          * sr_status remains 1 if an RPC level error occurred. The server
 444          * may or may not have processed the sequence operation..
 445          * Proceed as if the server received and processed the sequence
 446          * operation.
 447          */
 448         if (res->sr_status == 1)
 449                 res->sr_status = NFS_OK;
 450
 451         /* don't increment the sequence number if the task wasn't sent */
 452         if (!RPC_WAS_SENT(task))
 453                 goto out;
 454
 455         /* Check the SEQUENCE operation status */
 456         switch (res->sr_status) {
 457         case 0:
 458                 /* Update the slot's sequence and clientid lease timer */
 459                 ++res->sr_slot->seq_nr;
 460                 timestamp = res->sr_renewal_time;
 461                 clp = res->sr_session->clp;
 462                 do_renew_lease(clp, timestamp);
 463                 /* Check sequence flags */
 464                 if (res->sr_status_flags != 0)
 465                         nfs4_schedule_lease_recovery(clp);
 466                 break;
 467         case -NFS4ERR_DELAY:
 468                 /* The server detected a resend of the RPC call and
 469                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 470                  * of RFC5661.
 471                  */
 472                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 473                         __func__,
 474                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 475                         res->sr_slot->seq_nr);
 476                 goto out_retry;
 477         default:
 478                 /* Just update the slot sequence no. */
 479                 ++res->sr_slot->seq_nr;
 480         }
 481 out:
 482         /* The session may be reset by one of the error handlers. */
 483         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 484         nfs41_sequence_free_slot(res);
 485         return 1;
 486 out_retry:
 487         if (!rpc_restart_call(task))
 488                 goto out;
 489         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 490         return 0;
 491 }
 492
 493 static int nfs4_sequence_done(struct rpc_task *task,
 494                                struct nfs4_sequence_res *res)
 495 {
 496         if (res->sr_session == NULL)
 497                 return 1;
 498         return nfs41_sequence_done(task, res);
 499 }
 500
 501 /*
 502  * nfs4_find_slot - efficiently look for a free slot
 503  *
 504  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 505  * If found, we mark the slot as used, update the highest_used_slotid,
 506  * and respectively set up the sequence operation args.
 507  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 508  *
 509  * Note: must be called with under the slot_tbl_lock.
 510  */
 511 static u8
 512 nfs4_find_slot(struct nfs4_slot_table *tbl)
 513 {
 514         int slotid;
 515         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 516         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 517
 518         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 519                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 520                 tbl->max_slots);
 521         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 522         if (slotid >= tbl->max_slots)
 523                 goto out;
 524         __set_bit(slotid, tbl->used_slots);
 525         if (slotid > tbl->highest_used_slotid)
 526                 tbl->highest_used_slotid = slotid;
 527         ret_id = slotid;
 528 out:
 529         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 530                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 531         return ret_id;
 532 }
 533
 534 int nfs41_setup_sequence(struct nfs4_session *session,
 535                                 struct nfs4_sequence_args *args,
 536                                 struct nfs4_sequence_res *res,
 537                                 int cache_reply,
 538                                 struct rpc_task *task)
 539 {
 540         struct nfs4_slot *slot;
 541         struct nfs4_slot_table *tbl;
 542         u8 slotid;
 543
 544         dprintk("--> %s\n", __func__);
 545         /* slot already allocated? */
 546         if (res->sr_slot != NULL)
 547                 return 0;
 548
 549         tbl = &session->fc_slot_table;
 550
 551         spin_lock(&tbl->slot_tbl_lock);
 552         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 553             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 554                 /*
 555                  * The state manager will wait until the slot table is empty.
 556                  * Schedule the reset thread
 557                  */
 558                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 559                 spin_unlock(&tbl->slot_tbl_lock);
 560                 dprintk("%s Schedule Session Reset\n", __func__);
 561                 return -EAGAIN;
 562         }
 563
 564         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 565             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 566                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 567                 spin_unlock(&tbl->slot_tbl_lock);
 568                 dprintk("%s enforce FIFO order\n", __func__);
 569                 return -EAGAIN;
 570         }
 571
 572         slotid = nfs4_find_slot(tbl);
 573         if (slotid == NFS4_MAX_SLOT_TABLE) {
 574                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 575                 spin_unlock(&tbl->slot_tbl_lock);
 576                 dprintk("<-- %s: no free slots\n", __func__);
 577                 return -EAGAIN;
 578         }
 579         spin_unlock(&tbl->slot_tbl_lock);
 580
 581         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 582         slot = tbl->slots + slotid;
 583         args->sa_session = session;
 584         args->sa_slotid = slotid;
 585         args->sa_cache_this = cache_reply;
 586
 587         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 588
 589         res->sr_session = session;
 590         res->sr_slot = slot;
 591         res->sr_renewal_time = jiffies;
 592         res->sr_status_flags = 0;
 593         /*
 594          * sr_status is only set in decode_sequence, and so will remain
 595          * set to 1 if an rpc level failure occurs.
 596          */
 597         res->sr_status = 1;
 598         return 0;
 599 }
 600 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 601
 602 int nfs4_setup_sequence(const struct nfs_server *server,
 603                         struct nfs4_sequence_args *args,
 604                         struct nfs4_sequence_res *res,
 605                         int cache_reply,
 606                         struct rpc_task *task)
 607 {
 608         struct nfs4_session *session = nfs4_get_session(server);
 609         int ret = 0;
 610
 611         if (session == NULL) {
 612                 args->sa_session = NULL;
 613                 res->sr_session = NULL;
 614                 goto out;
 615         }
 616
 617         dprintk("--> %s clp %p session %p sr_slot %td\n",
 618                 __func__, session->clp, session, res->sr_slot ?
 619                         res->sr_slot - session->fc_slot_table.slots : -1);
 620
 621         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 622                                    task);
 623 out:
 624         dprintk("<-- %s status=%d\n", __func__, ret);
 625         return ret;
 626 }
 627
 628 struct nfs41_call_sync_data {
 629         const struct nfs_server *seq_server;
 630         struct nfs4_sequence_args *seq_args;
 631         struct nfs4_sequence_res *seq_res;
 632         int cache_reply;
 633 };
 634
 635 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 636 {
 637         struct nfs41_call_sync_data *data = calldata;
 638
 639         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 640
 641         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 642                                 data->seq_res, data->cache_reply, task))
 643                 return;
 644         rpc_call_start(task);
 645 }
 646
 647 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 648 {
 649         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 650         nfs41_call_sync_prepare(task, calldata);
 651 }
 652
 653 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 654 {
 655         struct nfs41_call_sync_data *data = calldata;
 656
 657         nfs41_sequence_done(task, data->seq_res);
 658 }
 659
 660 struct rpc_call_ops nfs41_call_sync_ops = {
 661         .rpc_call_prepare = nfs41_call_sync_prepare,
 662         .rpc_call_done = nfs41_call_sync_done,
 663 };
 664
 665 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 666         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 667         .rpc_call_done = nfs41_call_sync_done,
 668 };
 669
 670 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 671                                    struct nfs_server *server,
 672                                    struct rpc_message *msg,
 673                                    struct nfs4_sequence_args *args,
 674                                    struct nfs4_sequence_res *res,
 675                                    int cache_reply,
 676                                    int privileged)
 677 {
 678         int ret;
 679         struct rpc_task *task;
 680         struct nfs41_call_sync_data data = {
 681                 .seq_server = server,
 682                 .seq_args = args,
 683                 .seq_res = res,
 684                 .cache_reply = cache_reply,
 685         };
 686         struct rpc_task_setup task_setup = {
 687                 .rpc_client = clnt,
 688                 .rpc_message = msg,
 689                 .callback_ops = &nfs41_call_sync_ops,
 690                 .callback_data = &data
 691         };
 692
 693         res->sr_slot = NULL;
 694         if (privileged)
 695                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 696         task = rpc_run_task(&task_setup);
 697         if (IS_ERR(task))
 698                 ret = PTR_ERR(task);
 699         else {
 700                 ret = task->tk_status;
 701                 rpc_put_task(task);
 702         }
 703         return ret;
 704 }
 705
 706 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 707                             struct nfs_server *server,
 708                             struct rpc_message *msg,
 709                             struct nfs4_sequence_args *args,
 710                             struct nfs4_sequence_res *res,
 711                             int cache_reply)
 712 {
 713         return nfs4_call_sync_sequence(clnt, server, msg, args, res, cache_reply, 0);
 714 }
 715
 716 #else
 717 static int nfs4_sequence_done(struct rpc_task *task,
 718                                struct nfs4_sequence_res *res)
 719 {
 720         return 1;
 721 }
 722 #endif /* CONFIG_NFS_V4_1 */
 723
 724 int _nfs4_call_sync(struct rpc_clnt *clnt,
 725                     struct nfs_server *server,
 726                     struct rpc_message *msg,
 727                     struct nfs4_sequence_args *args,
 728                     struct nfs4_sequence_res *res,
 729                     int cache_reply)
 730 {
 731         args->sa_session = res->sr_session = NULL;
 732         return rpc_call_sync(clnt, msg, 0);
 733 }
 734
 735 static inline
 736 int nfs4_call_sync(struct rpc_clnt *clnt,
 737                    struct nfs_server *server,
 738                    struct rpc_message *msg,
 739                    struct nfs4_sequence_args *args,
 740                    struct nfs4_sequence_res *res,
 741                    int cache_reply)
 742 {
 743         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 744                                                 args, res, cache_reply);
 745 }
 746
 747 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 748 {
 749         struct nfs_inode *nfsi = NFS_I(dir);
 750
 751         spin_lock(&dir->i_lock);
 752         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 753         if (!cinfo->atomic || cinfo->before != dir->i_version)
 754                 nfs_force_lookup_revalidate(dir);
 755         dir->i_version = cinfo->after;
 756         spin_unlock(&dir->i_lock);
 757 }
 758
 759 struct nfs4_opendata {
 760         struct kref kref;
 761         struct nfs_openargs o_arg;
 762         struct nfs_openres o_res;
 763         struct nfs_open_confirmargs c_arg;
 764         struct nfs_open_confirmres c_res;
 765         struct nfs_fattr f_attr;
 766         struct nfs_fattr dir_attr;
 767         struct dentry *dir;
 768         struct dentry *dentry;
 769         struct nfs4_state_owner *owner;
 770         struct nfs4_state *state;
 771         struct iattr attrs;
 772         unsigned long timestamp;
 773         unsigned int rpc_done : 1;
 774         int rpc_status;
 775         int cancelled;
 776 };
 777
 778
 779 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 780 {
 781         p->o_res.f_attr = &p->f_attr;
 782         p->o_res.dir_attr = &p->dir_attr;
 783         p->o_res.seqid = p->o_arg.seqid;
 784         p->c_res.seqid = p->c_arg.seqid;
 785         p->o_res.server = p->o_arg.server;
 786         nfs_fattr_init(&p->f_attr);
 787         nfs_fattr_init(&p->dir_attr);
 788 }
 789
 790 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 791                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 792                 const struct iattr *attrs,
 793                 gfp_t gfp_mask)
 794 {
 795         struct dentry *parent = dget_parent(dentry);
 796         struct inode *dir = parent->d_inode;
 797         struct nfs_server *server = NFS_SERVER(dir);
 798         struct nfs4_opendata *p;
 799
 800         p = kzalloc(sizeof(*p), gfp_mask);
 801         if (p == NULL)
 802                 goto err;
 803         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 804         if (p->o_arg.seqid == NULL)
 805                 goto err_free;
 806         nfs_sb_active(dentry->d_sb);
 807         p->dentry = dget(dentry);
 808         p->dir = parent;
 809         p->owner = sp;
 810         atomic_inc(&sp->so_count);
 811         p->o_arg.fh = NFS_FH(dir);
 812         p->o_arg.open_flags = flags;
 813         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 814         p->o_arg.clientid = server->nfs_client->cl_clientid;
 815         p->o_arg.id = sp->so_owner_id.id;
 816         p->o_arg.name = &dentry->d_name;
 817         p->o_arg.server = server;
 818         p->o_arg.bitmask = server->attr_bitmask;
 819         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 820         if (flags & O_CREAT) {
 821                 u32 *s;
 822
 823                 p->o_arg.u.attrs = &p->attrs;
 824                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 825                 s = (u32 *) p->o_arg.u.verifier.data;
 826                 s[0] = jiffies;
 827                 s[1] = current->pid;
 828         }
 829         p->c_arg.fh = &p->o_res.fh;
 830         p->c_arg.stateid = &p->o_res.stateid;
 831         p->c_arg.seqid = p->o_arg.seqid;
 832         nfs4_init_opendata_res(p);
 833         kref_init(&p->kref);
 834         return p;
 835 err_free:
 836         kfree(p);
 837 err:
 838         dput(parent);
 839         return NULL;
 840 }
 841
 842 static void nfs4_opendata_free(struct kref *kref)
 843 {
 844         struct nfs4_opendata *p = container_of(kref,
 845                         struct nfs4_opendata, kref);
 846         struct super_block *sb = p->dentry->d_sb;
 847
 848         nfs_free_seqid(p->o_arg.seqid);
 849         if (p->state != NULL)
 850                 nfs4_put_open_state(p->state);
 851         nfs4_put_state_owner(p->owner);
 852         dput(p->dir);
 853         dput(p->dentry);
 854         nfs_sb_deactive(sb);
 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->dentry, 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(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(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(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->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 dentry *dentry, 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 (dentry->d_inode != NULL)
1744                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1745         status = -ENOMEM;
1746         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1747         if (opendata == NULL)
1748                 goto err_put_state_owner;
1749
1750         if (dentry->d_inode != NULL)
1751                 opendata->state = nfs4_get_open_state(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 dentry *dentry, 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, dentry, 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 inode *inode;
1894         struct nfs4_state *state;
1895         struct nfs_closeargs arg;
1896         struct nfs_closeres res;
1897         struct nfs_fattr fattr;
1898         unsigned long timestamp;
1899         bool roc;
1900         u32 roc_barrier;
1901 };
1902
1903 static void nfs4_free_closedata(void *data)
1904 {
1905         struct nfs4_closedata *calldata = data;
1906         struct nfs4_state_owner *sp = calldata->state->owner;
1907         struct super_block *sb = calldata->state->inode->i_sb;
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         nfs_sb_deactive(sb);
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 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         nfs_sb_active(calldata->inode->i_sb);
2071
2072         msg.rpc_argp = &calldata->arg;
2073         msg.rpc_resp = &calldata->res;
2074         task_setup_data.callback_data = calldata;
2075         task = rpc_run_task(&task_setup_data);
2076         if (IS_ERR(task))
2077                 return PTR_ERR(task);
2078         status = 0;
2079         if (wait)
2080                 status = rpc_wait_for_completion_task(task);
2081         rpc_put_task(task);
2082         return status;
2083 out_free_calldata:
2084         kfree(calldata);
2085 out:
2086         if (roc)
2087                 pnfs_roc_release(state->inode);
2088         nfs4_put_open_state(state);
2089         nfs4_put_state_owner(sp);
2090         return status;
2091 }
2092
2093 static struct inode *
2094 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2095 {
2096         struct nfs4_state *state;
2097
2098         /* Protect against concurrent sillydeletes */
2099         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2100         if (IS_ERR(state))
2101                 return ERR_CAST(state);
2102         ctx->state = state;
2103         return igrab(state->inode);
2104 }
2105
2106 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2107 {
2108         if (ctx->state == NULL)
2109                 return;
2110         if (is_sync)
2111                 nfs4_close_sync(ctx->state, ctx->mode);
2112         else
2113                 nfs4_close_state(ctx->state, ctx->mode);
2114 }
2115
2116 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2117 {
2118         struct nfs4_server_caps_arg args = {
2119                 .fhandle = fhandle,
2120         };
2121         struct nfs4_server_caps_res res = {};
2122         struct rpc_message msg = {
2123                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2124                 .rpc_argp = &args,
2125                 .rpc_resp = &res,
2126         };
2127         int status;
2128
2129         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2130         if (status == 0) {
2131                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2132                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2133                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2134                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2135                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2136                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2137                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2138                         server->caps |= NFS_CAP_ACLS;
2139                 if (res.has_links != 0)
2140                         server->caps |= NFS_CAP_HARDLINKS;
2141                 if (res.has_symlinks != 0)
2142                         server->caps |= NFS_CAP_SYMLINKS;
2143                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2144                         server->caps |= NFS_CAP_FILEID;
2145                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2146                         server->caps |= NFS_CAP_MODE;
2147                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2148                         server->caps |= NFS_CAP_NLINK;
2149                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2150                         server->caps |= NFS_CAP_OWNER;
2151                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2152                         server->caps |= NFS_CAP_OWNER_GROUP;
2153                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2154                         server->caps |= NFS_CAP_ATIME;
2155                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2156                         server->caps |= NFS_CAP_CTIME;
2157                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2158                         server->caps |= NFS_CAP_MTIME;
2159
2160                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2161                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2162                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2163                 server->acl_bitmask = res.acl_bitmask;
2164         }
2165
2166         return status;
2167 }
2168
2169 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2170 {
2171         struct nfs4_exception exception = { };
2172         int err;
2173         do {
2174                 err = nfs4_handle_exception(server,
2175                                 _nfs4_server_capabilities(server, fhandle),
2176                                 &exception);
2177         } while (exception.retry);
2178         return err;
2179 }
2180
2181 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2182                 struct nfs_fsinfo *info)
2183 {
2184         struct nfs4_lookup_root_arg args = {
2185                 .bitmask = nfs4_fattr_bitmap,
2186         };
2187         struct nfs4_lookup_res res = {
2188                 .server = server,
2189                 .fattr = info->fattr,
2190                 .fh = fhandle,
2191         };
2192         struct rpc_message msg = {
2193                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2194                 .rpc_argp = &args,
2195                 .rpc_resp = &res,
2196         };
2197
2198         nfs_fattr_init(info->fattr);
2199         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2200 }
2201
2202 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2203                 struct nfs_fsinfo *info)
2204 {
2205         struct nfs4_exception exception = { };
2206         int err;
2207         do {
2208                 err = _nfs4_lookup_root(server, fhandle, info);
2209                 switch (err) {
2210                 case 0:
2211                 case -NFS4ERR_WRONGSEC:
2212                         break;
2213                 default:
2214                         err = nfs4_handle_exception(server, err, &exception);
2215                 }
2216         } while (exception.retry);
2217         return err;
2218 }
2219
2220 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2221                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2222 {
2223         struct rpc_auth *auth;
2224         int ret;
2225
2226         auth = rpcauth_create(flavor, server->client);
2227         if (!auth) {
2228                 ret = -EIO;
2229                 goto out;
2230         }
2231         ret = nfs4_lookup_root(server, fhandle, info);
2232 out:
2233         return ret;
2234 }
2235
2236 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2237                               struct nfs_fsinfo *info)
2238 {
2239         int i, len, status = 0;
2240         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2241
2242         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2243         flav_array[len] = RPC_AUTH_NULL;
2244         len += 1;
2245
2246         for (i = 0; i < len; i++) {
2247                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2248                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2249                         continue;
2250                 break;
2251         }
2252         /*
2253          * -EACCESS could mean that the user doesn't have correct permissions
2254          * to access the mount.  It could also mean that we tried to mount
2255          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2256          * existing mount programs don't handle -EACCES very well so it should
2257          * be mapped to -EPERM instead.
2258          */
2259         if (status == -EACCES)
2260                 status = -EPERM;
2261         return status;
2262 }
2263
2264 /*
2265  * get the file handle for the "/" directory on the server
2266  */
2267 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2268                               struct nfs_fsinfo *info)
2269 {
2270         int minor_version = server->nfs_client->cl_minorversion;
2271         int status = nfs4_lookup_root(server, fhandle, info);
2272         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2273                 /*
2274                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2275                  * by nfs4_map_errors() as this function exits.
2276                  */
2277                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2278         if (status == 0)
2279                 status = nfs4_server_capabilities(server, fhandle);
2280         if (status == 0)
2281                 status = nfs4_do_fsinfo(server, fhandle, info);
2282         return nfs4_map_errors(status);
2283 }
2284
2285 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2286 /*
2287  * Get locations and (maybe) other attributes of a referral.
2288  * Note that we'll actually follow the referral later when
2289  * we detect fsid mismatch in inode revalidation
2290  */
2291 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2292                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2293 {
2294         int status = -ENOMEM;
2295         struct page *page = NULL;
2296         struct nfs4_fs_locations *locations = NULL;
2297
2298         page = alloc_page(GFP_KERNEL);
2299         if (page == NULL)
2300                 goto out;
2301         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2302         if (locations == NULL)
2303                 goto out;
2304
2305         status = nfs4_proc_fs_locations(dir, name, locations, page);
2306         if (status != 0)
2307                 goto out;
2308         /* Make sure server returned a different fsid for the referral */
2309         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2310                 dprintk("%s: server did not return a different fsid for"
2311                         " a referral at %s\n", __func__, name->name);
2312                 status = -EIO;
2313                 goto out;
2314         }
2315         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2316         nfs_fixup_referral_attributes(&locations->fattr);
2317
2318         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2319         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2320         memset(fhandle, 0, sizeof(struct nfs_fh));
2321 out:
2322         if (page)
2323                 __free_page(page);
2324         kfree(locations);
2325         return status;
2326 }
2327
2328 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2329 {
2330         struct nfs4_getattr_arg args = {
2331                 .fh = fhandle,
2332                 .bitmask = server->attr_bitmask,
2333         };
2334         struct nfs4_getattr_res res = {
2335                 .fattr = fattr,
2336                 .server = server,
2337         };
2338         struct rpc_message msg = {
2339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2340                 .rpc_argp = &args,
2341                 .rpc_resp = &res,
2342         };
2343
2344         nfs_fattr_init(fattr);
2345         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2346 }
2347
2348 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2349 {
2350         struct nfs4_exception exception = { };
2351         int err;
2352         do {
2353                 err = nfs4_handle_exception(server,
2354                                 _nfs4_proc_getattr(server, fhandle, fattr),
2355                                 &exception);
2356         } while (exception.retry);
2357         return err;
2358 }
2359
2360 /*
2361  * The file is not closed if it is opened due to the a request to change
2362  * the size of the file. The open call will not be needed once the
2363  * VFS layer lookup-intents are implemented.
2364  *
2365  * Close is called when the inode is destroyed.
2366  * If we haven't opened the file for O_WRONLY, we
2367  * need to in the size_change case to obtain a stateid.
2368  *
2369  * Got race?
2370  * Because OPEN is always done by name in nfsv4, it is
2371  * possible that we opened a different file by the same
2372  * name.  We can recognize this race condition, but we
2373  * can't do anything about it besides returning an error.
2374  *
2375  * This will be fixed with VFS changes (lookup-intent).
2376  */
2377 static int
2378 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2379                   struct iattr *sattr)
2380 {
2381         struct inode *inode = dentry->d_inode;
2382         struct rpc_cred *cred = NULL;
2383         struct nfs4_state *state = NULL;
2384         int status;
2385
2386         if (pnfs_ld_layoutret_on_setattr(inode))
2387                 pnfs_return_layout(inode);
2388
2389         nfs_fattr_init(fattr);
2390
2391         /* Search for an existing open(O_WRITE) file */
2392         if (sattr->ia_valid & ATTR_FILE) {
2393                 struct nfs_open_context *ctx;
2394
2395                 ctx = nfs_file_open_context(sattr->ia_file);
2396                 if (ctx) {
2397                         cred = ctx->cred;
2398                         state = ctx->state;
2399                 }
2400         }
2401
2402         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2403         if (status == 0)
2404                 nfs_setattr_update_inode(inode, sattr);
2405         return status;
2406 }
2407
2408 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2409                 const struct qstr *name, struct nfs_fh *fhandle,
2410                 struct nfs_fattr *fattr)
2411 {
2412         struct nfs_server *server = NFS_SERVER(dir);
2413         int                    status;
2414         struct nfs4_lookup_arg args = {
2415                 .bitmask = server->attr_bitmask,
2416                 .dir_fh = NFS_FH(dir),
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  lookup %s\n", name->name);
2433         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2434         dprintk("NFS reply lookup: %d\n", status);
2435         return status;
2436 }
2437
2438 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2439 {
2440         memset(fh, 0, sizeof(struct nfs_fh));
2441         fattr->fsid.major = 1;
2442         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2443                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2444         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2445         fattr->nlink = 2;
2446 }
2447
2448 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2449                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2450 {
2451         struct nfs4_exception exception = { };
2452         int err;
2453         do {
2454                 int status;
2455
2456                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2457                 switch (status) {
2458                 case -NFS4ERR_MOVED:
2459                         err = nfs4_get_referral(dir, name, fattr, fhandle);
2460                         break;
2461                 case -NFS4ERR_WRONGSEC:
2462                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2463                 }
2464                 err = nfs4_handle_exception(NFS_SERVER(dir),
2465                                 status, &exception);
2466         } while (exception.retry);
2467         return err;
2468 }
2469
2470 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2471 {
2472         struct nfs_server *server = NFS_SERVER(inode);
2473         struct nfs4_accessargs args = {
2474                 .fh = NFS_FH(inode),
2475                 .bitmask = server->attr_bitmask,
2476         };
2477         struct nfs4_accessres res = {
2478                 .server = server,
2479         };
2480         struct rpc_message msg = {
2481                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2482                 .rpc_argp = &args,
2483                 .rpc_resp = &res,
2484                 .rpc_cred = entry->cred,
2485         };
2486         int mode = entry->mask;
2487         int status;
2488
2489         /*
2490          * Determine which access bits we want to ask for...
2491          */
2492         if (mode & MAY_READ)
2493                 args.access |= NFS4_ACCESS_READ;
2494         if (S_ISDIR(inode->i_mode)) {
2495                 if (mode & MAY_WRITE)
2496                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2497                 if (mode & MAY_EXEC)
2498                         args.access |= NFS4_ACCESS_LOOKUP;
2499         } else {
2500                 if (mode & MAY_WRITE)
2501                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2502                 if (mode & MAY_EXEC)
2503                         args.access |= NFS4_ACCESS_EXECUTE;
2504         }
2505
2506         res.fattr = nfs_alloc_fattr();
2507         if (res.fattr == NULL)
2508                 return -ENOMEM;
2509
2510         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2511         if (!status) {
2512                 entry->mask = 0;
2513                 if (res.access & NFS4_ACCESS_READ)
2514                         entry->mask |= MAY_READ;
2515                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2516                         entry->mask |= MAY_WRITE;
2517                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2518                         entry->mask |= MAY_EXEC;
2519                 nfs_refresh_inode(inode, res.fattr);
2520         }
2521         nfs_free_fattr(res.fattr);
2522         return status;
2523 }
2524
2525 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2526 {
2527         struct nfs4_exception exception = { };
2528         int err;
2529         do {
2530                 err = nfs4_handle_exception(NFS_SERVER(inode),
2531                                 _nfs4_proc_access(inode, entry),
2532                                 &exception);
2533         } while (exception.retry);
2534         return err;
2535 }
2536
2537 /*
2538  * TODO: For the time being, we don't try to get any attributes
2539  * along with any of the zero-copy operations READ, READDIR,
2540  * READLINK, WRITE.
2541  *
2542  * In the case of the first three, we want to put the GETATTR
2543  * after the read-type operation -- this is because it is hard
2544  * to predict the length of a GETATTR response in v4, and thus
2545  * align the READ data correctly.  This means that the GETATTR
2546  * may end up partially falling into the page cache, and we should
2547  * shift it into the 'tail' of the xdr_buf before processing.
2548  * To do this efficiently, we need to know the total length
2549  * of data received, which doesn't seem to be available outside
2550  * of the RPC layer.
2551  *
2552  * In the case of WRITE, we also want to put the GETATTR after
2553  * the operation -- in this case because we want to make sure
2554  * we get the post-operation mtime and size.  This means that
2555  * we can't use xdr_encode_pages() as written: we need a variant
2556  * of it which would leave room in the 'tail' iovec.
2557  *
2558  * Both of these changes to the XDR layer would in fact be quite
2559  * minor, but I decided to leave them for a subsequent patch.
2560  */
2561 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2562                 unsigned int pgbase, unsigned int pglen)
2563 {
2564         struct nfs4_readlink args = {
2565                 .fh       = NFS_FH(inode),
2566                 .pgbase   = pgbase,
2567                 .pglen    = pglen,
2568                 .pages    = &page,
2569         };
2570         struct nfs4_readlink_res res;
2571         struct rpc_message msg = {
2572                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2573                 .rpc_argp = &args,
2574                 .rpc_resp = &res,
2575         };
2576
2577         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2578 }
2579
2580 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2581                 unsigned int pgbase, unsigned int pglen)
2582 {
2583         struct nfs4_exception exception = { };
2584         int err;
2585         do {
2586                 err = nfs4_handle_exception(NFS_SERVER(inode),
2587                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2588                                 &exception);
2589         } while (exception.retry);
2590         return err;
2591 }
2592
2593 /*
2594  * Got race?
2595  * We will need to arrange for the VFS layer to provide an atomic open.
2596  * Until then, this create/open method is prone to inefficiency and race
2597  * conditions due to the lookup, create, and open VFS calls from sys_open()
2598  * placed on the wire.
2599  *
2600  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2601  * The file will be opened again in the subsequent VFS open call
2602  * (nfs4_proc_file_open).
2603  *
2604  * The open for read will just hang around to be used by any process that
2605  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2606  */
2607
2608 static int
2609 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2610                  int flags, struct nfs_open_context *ctx)
2611 {
2612         struct dentry *de = dentry;
2613         struct nfs4_state *state;
2614         struct rpc_cred *cred = NULL;
2615         fmode_t fmode = 0;
2616         int status = 0;
2617
2618         if (ctx != NULL) {
2619                 cred = ctx->cred;
2620                 de = ctx->dentry;
2621                 fmode = ctx->mode;
2622         }
2623         sattr->ia_mode &= ~current_umask();
2624         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2625         d_drop(dentry);
2626         if (IS_ERR(state)) {
2627                 status = PTR_ERR(state);
2628                 goto out;
2629         }
2630         d_add(dentry, igrab(state->inode));
2631         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2632         if (ctx != NULL)
2633                 ctx->state = state;
2634         else
2635                 nfs4_close_sync(state, fmode);
2636 out:
2637         return status;
2638 }
2639
2640 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2641 {
2642         struct nfs_server *server = NFS_SERVER(dir);
2643         struct nfs_removeargs args = {
2644                 .fh = NFS_FH(dir),
2645                 .name.len = name->len,
2646                 .name.name = name->name,
2647                 .bitmask = server->attr_bitmask,
2648         };
2649         struct nfs_removeres res = {
2650                 .server = server,
2651         };
2652         struct rpc_message msg = {
2653                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2654                 .rpc_argp = &args,
2655                 .rpc_resp = &res,
2656         };
2657         int status = -ENOMEM;
2658
2659         res.dir_attr = nfs_alloc_fattr();
2660         if (res.dir_attr == NULL)
2661                 goto out;
2662
2663         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2664         if (status == 0) {
2665                 update_changeattr(dir, &res.cinfo);
2666                 nfs_post_op_update_inode(dir, res.dir_attr);
2667         }
2668         nfs_free_fattr(res.dir_attr);
2669 out:
2670         return status;
2671 }
2672
2673 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2674 {
2675         struct nfs4_exception exception = { };
2676         int err;
2677         do {
2678                 err = nfs4_handle_exception(NFS_SERVER(dir),
2679                                 _nfs4_proc_remove(dir, name),
2680                                 &exception);
2681         } while (exception.retry);
2682         return err;
2683 }
2684
2685 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2686 {
2687         struct nfs_server *server = NFS_SERVER(dir);
2688         struct nfs_removeargs *args = msg->rpc_argp;
2689         struct nfs_removeres *res = msg->rpc_resp;
2690
2691         args->bitmask = server->cache_consistency_bitmask;
2692         res->server = server;
2693         res->seq_res.sr_slot = NULL;
2694         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2695 }
2696
2697 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2698 {
2699         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2700
2701         if (!nfs4_sequence_done(task, &res->seq_res))
2702                 return 0;
2703         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2704                 return 0;
2705         update_changeattr(dir, &res->cinfo);
2706         nfs_post_op_update_inode(dir, res->dir_attr);
2707         return 1;
2708 }
2709
2710 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2711 {
2712         struct nfs_server *server = NFS_SERVER(dir);
2713         struct nfs_renameargs *arg = msg->rpc_argp;
2714         struct nfs_renameres *res = msg->rpc_resp;
2715
2716         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2717         arg->bitmask = server->attr_bitmask;
2718         res->server = server;
2719 }
2720
2721 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2722                                  struct inode *new_dir)
2723 {
2724         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2725
2726         if (!nfs4_sequence_done(task, &res->seq_res))
2727                 return 0;
2728         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2729                 return 0;
2730
2731         update_changeattr(old_dir, &res->old_cinfo);
2732         nfs_post_op_update_inode(old_dir, res->old_fattr);
2733         update_changeattr(new_dir, &res->new_cinfo);
2734         nfs_post_op_update_inode(new_dir, res->new_fattr);
2735         return 1;
2736 }
2737
2738 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2739                 struct inode *new_dir, struct qstr *new_name)
2740 {
2741         struct nfs_server *server = NFS_SERVER(old_dir);
2742         struct nfs_renameargs arg = {
2743                 .old_dir = NFS_FH(old_dir),
2744                 .new_dir = NFS_FH(new_dir),
2745                 .old_name = old_name,
2746                 .new_name = new_name,
2747                 .bitmask = server->attr_bitmask,
2748         };
2749         struct nfs_renameres res = {
2750                 .server = server,
2751         };
2752         struct rpc_message msg = {
2753                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2754                 .rpc_argp = &arg,
2755                 .rpc_resp = &res,
2756         };
2757         int status = -ENOMEM;
2758
2759         res.old_fattr = nfs_alloc_fattr();
2760         res.new_fattr = nfs_alloc_fattr();
2761         if (res.old_fattr == NULL || res.new_fattr == NULL)
2762                 goto out;
2763
2764         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2765         if (!status) {
2766                 update_changeattr(old_dir, &res.old_cinfo);
2767                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2768                 update_changeattr(new_dir, &res.new_cinfo);
2769                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2770         }
2771 out:
2772         nfs_free_fattr(res.new_fattr);
2773         nfs_free_fattr(res.old_fattr);
2774         return status;
2775 }
2776
2777 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2778                 struct inode *new_dir, struct qstr *new_name)
2779 {
2780         struct nfs4_exception exception = { };
2781         int err;
2782         do {
2783                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2784                                 _nfs4_proc_rename(old_dir, old_name,
2785                                         new_dir, new_name),
2786                                 &exception);
2787         } while (exception.retry);
2788         return err;
2789 }
2790
2791 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2792 {
2793         struct nfs_server *server = NFS_SERVER(inode);
2794         struct nfs4_link_arg arg = {
2795                 .fh     = NFS_FH(inode),
2796                 .dir_fh = NFS_FH(dir),
2797                 .name   = name,
2798                 .bitmask = server->attr_bitmask,
2799         };
2800         struct nfs4_link_res res = {
2801                 .server = server,
2802         };
2803         struct rpc_message msg = {
2804                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2805                 .rpc_argp = &arg,
2806                 .rpc_resp = &res,
2807         };
2808         int status = -ENOMEM;
2809
2810         res.fattr = nfs_alloc_fattr();
2811         res.dir_attr = nfs_alloc_fattr();
2812         if (res.fattr == NULL || res.dir_attr == NULL)
2813                 goto out;
2814
2815         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2816         if (!status) {
2817                 update_changeattr(dir, &res.cinfo);
2818                 nfs_post_op_update_inode(dir, res.dir_attr);
2819                 nfs_post_op_update_inode(inode, res.fattr);
2820         }
2821 out:
2822         nfs_free_fattr(res.dir_attr);
2823         nfs_free_fattr(res.fattr);
2824         return status;
2825 }
2826
2827 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2828 {
2829         struct nfs4_exception exception = { };
2830         int err;
2831         do {
2832                 err = nfs4_handle_exception(NFS_SERVER(inode),
2833                                 _nfs4_proc_link(inode, dir, name),
2834                                 &exception);
2835         } while (exception.retry);
2836         return err;
2837 }
2838
2839 struct nfs4_createdata {
2840         struct rpc_message msg;
2841         struct nfs4_create_arg arg;
2842         struct nfs4_create_res res;
2843         struct nfs_fh fh;
2844         struct nfs_fattr fattr;
2845         struct nfs_fattr dir_fattr;
2846 };
2847
2848 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2849                 struct qstr *name, struct iattr *sattr, u32 ftype)
2850 {
2851         struct nfs4_createdata *data;
2852
2853         data = kzalloc(sizeof(*data), GFP_KERNEL);
2854         if (data != NULL) {
2855                 struct nfs_server *server = NFS_SERVER(dir);
2856
2857                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2858                 data->msg.rpc_argp = &data->arg;
2859                 data->msg.rpc_resp = &data->res;
2860                 data->arg.dir_fh = NFS_FH(dir);
2861                 data->arg.server = server;
2862                 data->arg.name = name;
2863                 data->arg.attrs = sattr;
2864                 data->arg.ftype = ftype;
2865                 data->arg.bitmask = server->attr_bitmask;
2866                 data->res.server = server;
2867                 data->res.fh = &data->fh;
2868                 data->res.fattr = &data->fattr;
2869                 data->res.dir_fattr = &data->dir_fattr;
2870                 nfs_fattr_init(data->res.fattr);
2871                 nfs_fattr_init(data->res.dir_fattr);
2872         }
2873         return data;
2874 }
2875
2876 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2877 {
2878         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2879                                     &data->arg.seq_args, &data->res.seq_res, 1);
2880         if (status == 0) {
2881                 update_changeattr(dir, &data->res.dir_cinfo);
2882                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2883                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2884         }
2885         return status;
2886 }
2887
2888 static void nfs4_free_createdata(struct nfs4_createdata *data)
2889 {
2890         kfree(data);
2891 }
2892
2893 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2894                 struct page *page, unsigned int len, struct iattr *sattr)
2895 {
2896         struct nfs4_createdata *data;
2897         int status = -ENAMETOOLONG;
2898
2899         if (len > NFS4_MAXPATHLEN)
2900                 goto out;
2901
2902         status = -ENOMEM;
2903         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2904         if (data == NULL)
2905                 goto out;
2906
2907         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2908         data->arg.u.symlink.pages = &page;
2909         data->arg.u.symlink.len = len;
2910
2911         status = nfs4_do_create(dir, dentry, data);
2912
2913         nfs4_free_createdata(data);
2914 out:
2915         return status;
2916 }
2917
2918 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2919                 struct page *page, unsigned int len, struct iattr *sattr)
2920 {
2921         struct nfs4_exception exception = { };
2922         int err;
2923         do {
2924                 err = nfs4_handle_exception(NFS_SERVER(dir),
2925                                 _nfs4_proc_symlink(dir, dentry, page,
2926                                                         len, sattr),
2927                                 &exception);
2928         } while (exception.retry);
2929         return err;
2930 }
2931
2932 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2933                 struct iattr *sattr)
2934 {
2935         struct nfs4_createdata *data;
2936         int status = -ENOMEM;
2937
2938         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2939         if (data == NULL)
2940                 goto out;
2941
2942         status = nfs4_do_create(dir, dentry, data);
2943
2944         nfs4_free_createdata(data);
2945 out:
2946         return status;
2947 }
2948
2949 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2950                 struct iattr *sattr)
2951 {
2952         struct nfs4_exception exception = { };
2953         int err;
2954
2955         sattr->ia_mode &= ~current_umask();
2956         do {
2957                 err = nfs4_handle_exception(NFS_SERVER(dir),
2958                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2959                                 &exception);
2960         } while (exception.retry);
2961         return err;
2962 }
2963
2964 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2965                 u64 cookie, struct page **pages, unsigned int count, int plus)
2966 {
2967         struct inode            *dir = dentry->d_inode;
2968         struct nfs4_readdir_arg args = {
2969                 .fh = NFS_FH(dir),
2970                 .pages = pages,
2971                 .pgbase = 0,
2972                 .count = count,
2973                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2974                 .plus = plus,
2975         };
2976         struct nfs4_readdir_res res;
2977         struct rpc_message msg = {
2978                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2979                 .rpc_argp = &args,
2980                 .rpc_resp = &res,
2981                 .rpc_cred = cred,
2982         };
2983         int                     status;
2984
2985         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2986                         dentry->d_parent->d_name.name,
2987                         dentry->d_name.name,
2988                         (unsigned long long)cookie);
2989         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2990         res.pgbase = args.pgbase;
2991         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
2992         if (status >= 0) {
2993                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2994                 status += args.pgbase;
2995         }
2996
2997         nfs_invalidate_atime(dir);
2998
2999         dprintk("%s: returns %d\n", __func__, status);
3000         return status;
3001 }
3002
3003 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3004                 u64 cookie, struct page **pages, unsigned int count, int plus)
3005 {
3006         struct nfs4_exception exception = { };
3007         int err;
3008         do {
3009                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3010                                 _nfs4_proc_readdir(dentry, cred, cookie,
3011                                         pages, count, plus),
3012                                 &exception);
3013         } while (exception.retry);
3014         return err;
3015 }
3016
3017 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3018                 struct iattr *sattr, dev_t rdev)
3019 {
3020         struct nfs4_createdata *data;
3021         int mode = sattr->ia_mode;
3022         int status = -ENOMEM;
3023
3024         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3025         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3026
3027         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3028         if (data == NULL)
3029                 goto out;
3030
3031         if (S_ISFIFO(mode))
3032                 data->arg.ftype = NF4FIFO;
3033         else if (S_ISBLK(mode)) {
3034                 data->arg.ftype = NF4BLK;
3035                 data->arg.u.device.specdata1 = MAJOR(rdev);
3036                 data->arg.u.device.specdata2 = MINOR(rdev);
3037         }
3038         else if (S_ISCHR(mode)) {
3039                 data->arg.ftype = NF4CHR;
3040                 data->arg.u.device.specdata1 = MAJOR(rdev);
3041                 data->arg.u.device.specdata2 = MINOR(rdev);
3042         }
3043
3044         status = nfs4_do_create(dir, dentry, data);
3045
3046         nfs4_free_createdata(data);
3047 out:
3048         return status;
3049 }
3050
3051 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3052                 struct iattr *sattr, dev_t rdev)
3053 {
3054         struct nfs4_exception exception = { };
3055         int err;
3056
3057         sattr->ia_mode &= ~current_umask();
3058         do {
3059                 err = nfs4_handle_exception(NFS_SERVER(dir),
3060                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3061                                 &exception);
3062         } while (exception.retry);
3063         return err;
3064 }
3065
3066 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3067                  struct nfs_fsstat *fsstat)
3068 {
3069         struct nfs4_statfs_arg args = {
3070                 .fh = fhandle,
3071                 .bitmask = server->attr_bitmask,
3072         };
3073         struct nfs4_statfs_res res = {
3074                 .fsstat = fsstat,
3075         };
3076         struct rpc_message msg = {
3077                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3078                 .rpc_argp = &args,
3079                 .rpc_resp = &res,
3080         };
3081
3082         nfs_fattr_init(fsstat->fattr);
3083         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3084 }
3085
3086 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3087 {
3088         struct nfs4_exception exception = { };
3089         int err;
3090         do {
3091                 err = nfs4_handle_exception(server,
3092                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3093                                 &exception);
3094         } while (exception.retry);
3095         return err;
3096 }
3097
3098 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3099                 struct nfs_fsinfo *fsinfo)
3100 {
3101         struct nfs4_fsinfo_arg args = {
3102                 .fh = fhandle,
3103                 .bitmask = server->attr_bitmask,
3104         };
3105         struct nfs4_fsinfo_res res = {
3106                 .fsinfo = fsinfo,
3107         };
3108         struct rpc_message msg = {
3109                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3110                 .rpc_argp = &args,
3111                 .rpc_resp = &res,
3112         };
3113
3114         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3115 }
3116
3117 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3118 {
3119         struct nfs4_exception exception = { };
3120         int err;
3121
3122         do {
3123                 err = nfs4_handle_exception(server,
3124                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3125                                 &exception);
3126         } while (exception.retry);
3127         return err;
3128 }
3129
3130 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3131 {
3132         nfs_fattr_init(fsinfo->fattr);
3133         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3134 }
3135
3136 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3137                 struct nfs_pathconf *pathconf)
3138 {
3139         struct nfs4_pathconf_arg args = {
3140                 .fh = fhandle,
3141                 .bitmask = server->attr_bitmask,
3142         };
3143         struct nfs4_pathconf_res res = {
3144                 .pathconf = pathconf,
3145         };
3146         struct rpc_message msg = {
3147                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3148                 .rpc_argp = &args,
3149                 .rpc_resp = &res,
3150         };
3151
3152         /* None of the pathconf attributes are mandatory to implement */
3153         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3154                 memset(pathconf, 0, sizeof(*pathconf));
3155                 return 0;
3156         }
3157
3158         nfs_fattr_init(pathconf->fattr);
3159         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3160 }
3161
3162 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3163                 struct nfs_pathconf *pathconf)
3164 {
3165         struct nfs4_exception exception = { };
3166         int err;
3167
3168         do {
3169                 err = nfs4_handle_exception(server,
3170                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3171                                 &exception);
3172         } while (exception.retry);
3173         return err;
3174 }
3175
3176 void __nfs4_read_done_cb(struct nfs_read_data *data)
3177 {
3178         nfs_invalidate_atime(data->inode);
3179 }
3180
3181 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3182 {
3183         struct nfs_server *server = NFS_SERVER(data->inode);
3184
3185         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3186                 nfs_restart_rpc(task, server->nfs_client);
3187                 return -EAGAIN;
3188         }
3189
3190         __nfs4_read_done_cb(data);
3191         if (task->tk_status > 0)
3192                 renew_lease(server, data->timestamp);
3193         return 0;
3194 }
3195
3196 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3197 {
3198
3199         dprintk("--> %s\n", __func__);
3200
3201         if (!nfs4_sequence_done(task, &data->res.seq_res))
3202                 return -EAGAIN;
3203
3204         return data->read_done_cb ? data->read_done_cb(task, data) :
3205                                     nfs4_read_done_cb(task, data);
3206 }
3207
3208 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3209 {
3210         data->timestamp   = jiffies;
3211         data->read_done_cb = nfs4_read_done_cb;
3212         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3213 }
3214
3215 /* Reset the the nfs_read_data to send the read to the MDS. */
3216 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3217 {
3218         dprintk("%s Reset task for i/o through\n", __func__);
3219         put_lseg(data->lseg);
3220         data->lseg = NULL;
3221         /* offsets will differ in the dense stripe case */
3222         data->args.offset = data->mds_offset;
3223         data->ds_clp = NULL;
3224         data->args.fh     = NFS_FH(data->inode);
3225         data->read_done_cb = nfs4_read_done_cb;
3226         task->tk_ops = data->mds_ops;
3227         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3228 }
3229 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3230
3231 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3232 {
3233         struct inode *inode = data->inode;
3234
3235         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3236                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3237                 return -EAGAIN;
3238         }
3239         if (task->tk_status >= 0) {
3240                 renew_lease(NFS_SERVER(inode), data->timestamp);
3241                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3242         }
3243         return 0;
3244 }
3245
3246 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3247 {
3248         if (!nfs4_sequence_done(task, &data->res.seq_res))
3249                 return -EAGAIN;
3250         return data->write_done_cb ? data->write_done_cb(task, data) :
3251                 nfs4_write_done_cb(task, data);
3252 }
3253
3254 /* Reset the the nfs_write_data to send the write to the MDS. */
3255 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3256 {
3257         dprintk("%s Reset task for i/o through\n", __func__);
3258         put_lseg(data->lseg);
3259         data->lseg          = NULL;
3260         data->ds_clp        = NULL;
3261         data->write_done_cb = nfs4_write_done_cb;
3262         data->args.fh       = NFS_FH(data->inode);
3263         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3264         data->args.offset   = data->mds_offset;
3265         data->res.fattr     = &data->fattr;
3266         task->tk_ops        = data->mds_ops;
3267         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3268 }
3269 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3270
3271 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3272 {
3273         struct nfs_server *server = NFS_SERVER(data->inode);
3274
3275         if (data->lseg) {
3276                 data->args.bitmask = NULL;
3277                 data->res.fattr = NULL;
3278         } else
3279                 data->args.bitmask = server->cache_consistency_bitmask;
3280         if (!data->write_done_cb)
3281                 data->write_done_cb = nfs4_write_done_cb;
3282         data->res.server = server;
3283         data->timestamp   = jiffies;
3284
3285         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3286 }
3287
3288 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3289 {
3290         struct inode *inode = data->inode;
3291
3292         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3293                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3294                 return -EAGAIN;
3295         }
3296         nfs_refresh_inode(inode, data->res.fattr);
3297         return 0;
3298 }
3299
3300 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3301 {
3302         if (!nfs4_sequence_done(task, &data->res.seq_res))
3303                 return -EAGAIN;
3304         return data->write_done_cb(task, data);
3305 }
3306
3307 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3308 {
3309         struct nfs_server *server = NFS_SERVER(data->inode);
3310
3311         if (data->lseg) {
3312                 data->args.bitmask = NULL;
3313                 data->res.fattr = NULL;
3314         } else
3315                 data->args.bitmask = server->cache_consistency_bitmask;
3316         if (!data->write_done_cb)
3317                 data->write_done_cb = nfs4_commit_done_cb;
3318         data->res.server = server;
3319         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3320 }
3321
3322 struct nfs4_renewdata {
3323         struct nfs_client       *client;
3324         unsigned long           timestamp;
3325 };
3326
3327 /*
3328  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3329  * standalone procedure for queueing an asynchronous RENEW.
3330  */
3331 static void nfs4_renew_release(void *calldata)
3332 {
3333         struct nfs4_renewdata *data = calldata;
3334         struct nfs_client *clp = data->client;
3335
3336         if (atomic_read(&clp->cl_count) > 1)
3337                 nfs4_schedule_state_renewal(clp);
3338         nfs_put_client(clp);
3339         kfree(data);
3340 }
3341
3342 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3343 {
3344         struct nfs4_renewdata *data = calldata;
3345         struct nfs_client *clp = data->client;
3346         unsigned long timestamp = data->timestamp;
3347
3348         if (task->tk_status < 0) {
3349                 /* Unless we're shutting down, schedule state recovery! */
3350                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3351                         return;
3352                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3353                         nfs4_schedule_lease_recovery(clp);
3354                         return;
3355                 }
3356                 nfs4_schedule_path_down_recovery(clp);
3357         }
3358         do_renew_lease(clp, timestamp);
3359 }
3360
3361 static const struct rpc_call_ops nfs4_renew_ops = {
3362         .rpc_call_done = nfs4_renew_done,
3363         .rpc_release = nfs4_renew_release,
3364 };
3365
3366 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3367 {
3368         struct rpc_message msg = {
3369                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3370                 .rpc_argp       = clp,
3371                 .rpc_cred       = cred,
3372         };
3373         struct nfs4_renewdata *data;
3374
3375         if (renew_flags == 0)
3376                 return 0;
3377         if (!atomic_inc_not_zero(&clp->cl_count))
3378                 return -EIO;
3379         data = kmalloc(sizeof(*data), GFP_NOFS);
3380         if (data == NULL)
3381                 return -ENOMEM;
3382         data->client = clp;
3383         data->timestamp = jiffies;
3384         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3385                         &nfs4_renew_ops, data);
3386 }
3387
3388 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3389 {
3390         struct rpc_message msg = {
3391                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3392                 .rpc_argp       = clp,
3393                 .rpc_cred       = cred,
3394         };
3395         unsigned long now = jiffies;
3396         int status;
3397
3398         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3399         if (status < 0)
3400                 return status;
3401         do_renew_lease(clp, now);
3402         return 0;
3403 }
3404
3405 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3406 {
3407         return (server->caps & NFS_CAP_ACLS)
3408                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3409                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3410 }
3411
3412 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3413  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3414  * the stack.
3415  */
3416 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3417
3418 static void buf_to_pages(const void *buf, size_t buflen,
3419                 struct page **pages, unsigned int *pgbase)
3420 {
3421         const void *p = buf;
3422
3423         *pgbase = offset_in_page(buf);
3424         p -= *pgbase;
3425         while (p < buf + buflen) {
3426                 *(pages++) = virt_to_page(p);
3427                 p += PAGE_CACHE_SIZE;
3428         }
3429 }
3430
3431 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3432                 struct page **pages, unsigned int *pgbase)
3433 {
3434         struct page *newpage, **spages;
3435         int rc = 0;
3436         size_t len;
3437         spages = pages;
3438
3439         do {
3440                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3441                 newpage = alloc_page(GFP_KERNEL);
3442
3443                 if (newpage == NULL)
3444                         goto unwind;
3445                 memcpy(page_address(newpage), buf, len);
3446                 buf += len;
3447                 buflen -= len;
3448                 *pages++ = newpage;
3449                 rc++;
3450         } while (buflen != 0);
3451
3452         return rc;
3453
3454 unwind:
3455         for(; rc > 0; rc--)
3456                 __free_page(spages[rc-1]);
3457         return -ENOMEM;
3458 }
3459
3460 struct nfs4_cached_acl {
3461         int cached;
3462         size_t len;
3463         char data[0];
3464 };
3465
3466 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3467 {
3468         struct nfs_inode *nfsi = NFS_I(inode);
3469
3470         spin_lock(&inode->i_lock);
3471         kfree(nfsi->nfs4_acl);
3472         nfsi->nfs4_acl = acl;
3473         spin_unlock(&inode->i_lock);
3474 }
3475
3476 static void nfs4_zap_acl_attr(struct inode *inode)
3477 {
3478         nfs4_set_cached_acl(inode, NULL);
3479 }
3480
3481 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3482 {
3483         struct nfs_inode *nfsi = NFS_I(inode);
3484         struct nfs4_cached_acl *acl;
3485         int ret = -ENOENT;
3486
3487         spin_lock(&inode->i_lock);
3488         acl = nfsi->nfs4_acl;
3489         if (acl == NULL)
3490                 goto out;
3491         if (buf == NULL) /* user is just asking for length */
3492                 goto out_len;
3493         if (acl->cached == 0)
3494                 goto out;
3495         ret = -ERANGE; /* see getxattr(2) man page */
3496         if (acl->len > buflen)
3497                 goto out;
3498         memcpy(buf, acl->data, acl->len);
3499 out_len:
3500         ret = acl->len;
3501 out:
3502         spin_unlock(&inode->i_lock);
3503         return ret;
3504 }
3505
3506 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3507 {
3508         struct nfs4_cached_acl *acl;
3509
3510         if (buf && acl_len <= PAGE_SIZE) {
3511                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3512                 if (acl == NULL)
3513                         goto out;
3514                 acl->cached = 1;
3515                 memcpy(acl->data, buf, acl_len);
3516         } else {
3517                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3518                 if (acl == NULL)
3519                         goto out;
3520                 acl->cached = 0;
3521         }
3522         acl->len = acl_len;
3523 out:
3524         nfs4_set_cached_acl(inode, acl);
3525 }
3526
3527 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3528 {
3529         struct page *pages[NFS4ACL_MAXPAGES];
3530         struct nfs_getaclargs args = {
3531                 .fh = NFS_FH(inode),
3532                 .acl_pages = pages,
3533                 .acl_len = buflen,
3534         };
3535         struct nfs_getaclres res = {
3536                 .acl_len = buflen,
3537         };
3538         void *resp_buf;
3539         struct rpc_message msg = {
3540                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3541                 .rpc_argp = &args,
3542                 .rpc_resp = &res,
3543         };
3544         struct page *localpage = NULL;
3545         int ret;
3546
3547         if (buflen < PAGE_SIZE) {
3548                 /* As long as we're doing a round trip to the server anyway,
3549                  * let's be prepared for a page of acl data. */
3550                 localpage = alloc_page(GFP_KERNEL);
3551                 resp_buf = page_address(localpage);
3552                 if (localpage == NULL)
3553                         return -ENOMEM;
3554                 args.acl_pages[0] = localpage;
3555                 args.acl_pgbase = 0;
3556                 args.acl_len = PAGE_SIZE;
3557         } else {
3558                 resp_buf = buf;
3559                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3560         }
3561         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3562         if (ret)
3563                 goto out_free;
3564         if (res.acl_len > args.acl_len)
3565                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3566         else
3567                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3568         if (buf) {
3569                 ret = -ERANGE;
3570                 if (res.acl_len > buflen)
3571                         goto out_free;
3572                 if (localpage)
3573                         memcpy(buf, resp_buf, res.acl_len);
3574         }
3575         ret = res.acl_len;
3576 out_free:
3577         if (localpage)
3578                 __free_page(localpage);
3579         return ret;
3580 }
3581
3582 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3583 {
3584         struct nfs4_exception exception = { };
3585         ssize_t ret;
3586         do {
3587                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3588                 if (ret >= 0)
3589                         break;
3590                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3591         } while (exception.retry);
3592         return ret;
3593 }
3594
3595 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3596 {
3597         struct nfs_server *server = NFS_SERVER(inode);
3598         int ret;
3599
3600         if (!nfs4_server_supports_acls(server))
3601                 return -EOPNOTSUPP;
3602         ret = nfs_revalidate_inode(server, inode);
3603         if (ret < 0)
3604                 return ret;
3605         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3606                 nfs_zap_acl_cache(inode);
3607         ret = nfs4_read_cached_acl(inode, buf, buflen);
3608         if (ret != -ENOENT)
3609                 return ret;
3610         return nfs4_get_acl_uncached(inode, buf, buflen);
3611 }
3612
3613 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3614 {
3615         struct nfs_server *server = NFS_SERVER(inode);
3616         struct page *pages[NFS4ACL_MAXPAGES];
3617         struct nfs_setaclargs arg = {
3618                 .fh             = NFS_FH(inode),
3619                 .acl_pages      = pages,
3620                 .acl_len        = buflen,
3621         };
3622         struct nfs_setaclres res;
3623         struct rpc_message msg = {
3624                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3625                 .rpc_argp       = &arg,
3626                 .rpc_resp       = &res,
3627         };
3628         int ret, i;
3629
3630         if (!nfs4_server_supports_acls(server))
3631                 return -EOPNOTSUPP;
3632         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3633         if (i < 0)
3634                 return i;
3635         nfs_inode_return_delegation(inode);
3636         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3637
3638         /*
3639          * Free each page after tx, so the only ref left is
3640          * held by the network stack
3641          */
3642         for (; i > 0; i--)
3643                 put_page(pages[i-1]);
3644
3645         /*
3646          * Acl update can result in inode attribute update.
3647          * so mark the attribute cache invalid.
3648          */
3649         spin_lock(&inode->i_lock);
3650         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3651         spin_unlock(&inode->i_lock);
3652         nfs_access_zap_cache(inode);
3653         nfs_zap_acl_cache(inode);
3654         return ret;
3655 }
3656
3657 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3658 {
3659         struct nfs4_exception exception = { };
3660         int err;
3661         do {
3662                 err = nfs4_handle_exception(NFS_SERVER(inode),
3663                                 __nfs4_proc_set_acl(inode, buf, buflen),
3664                                 &exception);
3665         } while (exception.retry);
3666         return err;
3667 }
3668
3669 static int
3670 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3671 {
3672         struct nfs_client *clp = server->nfs_client;
3673
3674         if (task->tk_status >= 0)
3675                 return 0;
3676         switch(task->tk_status) {
3677                 case -NFS4ERR_ADMIN_REVOKED:
3678                 case -NFS4ERR_BAD_STATEID:
3679                 case -NFS4ERR_OPENMODE:
3680                         if (state == NULL)
3681                                 break;
3682                         nfs4_schedule_stateid_recovery(server, state);
3683                         goto wait_on_recovery;
3684                 case -NFS4ERR_EXPIRED:
3685                         if (state != NULL)
3686                                 nfs4_schedule_stateid_recovery(server, state);
3687                 case -NFS4ERR_STALE_STATEID:
3688                 case -NFS4ERR_STALE_CLIENTID:
3689                         nfs4_schedule_lease_recovery(clp);
3690                         goto wait_on_recovery;
3691 #if defined(CONFIG_NFS_V4_1)
3692                 case -NFS4ERR_BADSESSION:
3693                 case -NFS4ERR_BADSLOT:
3694                 case -NFS4ERR_BAD_HIGH_SLOT:
3695                 case -NFS4ERR_DEADSESSION:
3696                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3697                 case -NFS4ERR_SEQ_FALSE_RETRY:
3698                 case -NFS4ERR_SEQ_MISORDERED:
3699                         dprintk("%s ERROR %d, Reset session\n", __func__,
3700                                 task->tk_status);
3701                         nfs4_schedule_session_recovery(clp->cl_session);
3702                         task->tk_status = 0;
3703                         return -EAGAIN;
3704 #endif /* CONFIG_NFS_V4_1 */
3705                 case -NFS4ERR_DELAY:
3706                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3707                 case -NFS4ERR_GRACE:
3708                 case -EKEYEXPIRED:
3709                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3710                         task->tk_status = 0;
3711                         return -EAGAIN;
3712                 case -NFS4ERR_RETRY_UNCACHED_REP:
3713                 case -NFS4ERR_OLD_STATEID:
3714                         task->tk_status = 0;
3715                         return -EAGAIN;
3716         }
3717         task->tk_status = nfs4_map_errors(task->tk_status);
3718         return 0;
3719 wait_on_recovery:
3720         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3721         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3722                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3723         task->tk_status = 0;
3724         return -EAGAIN;
3725 }
3726
3727 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3728                 unsigned short port, struct rpc_cred *cred,
3729                 struct nfs4_setclientid_res *res)
3730 {
3731         nfs4_verifier sc_verifier;
3732         struct nfs4_setclientid setclientid = {
3733                 .sc_verifier = &sc_verifier,
3734                 .sc_prog = program,
3735                 .sc_cb_ident = clp->cl_cb_ident,
3736         };
3737         struct rpc_message msg = {
3738                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3739                 .rpc_argp = &setclientid,
3740                 .rpc_resp = res,
3741                 .rpc_cred = cred,
3742         };
3743         __be32 *p;
3744         int loop = 0;
3745         int status;
3746
3747         p = (__be32*)sc_verifier.data;
3748         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3749         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3750
3751         for(;;) {
3752                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3753                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3754                                 clp->cl_ipaddr,
3755                                 rpc_peeraddr2str(clp->cl_rpcclient,
3756                                                         RPC_DISPLAY_ADDR),
3757                                 rpc_peeraddr2str(clp->cl_rpcclient,
3758                                                         RPC_DISPLAY_PROTO),
3759                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3760                                 clp->cl_id_uniquifier);
3761                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3762                                 sizeof(setclientid.sc_netid),
3763                                 rpc_peeraddr2str(clp->cl_rpcclient,
3764                                                         RPC_DISPLAY_NETID));
3765                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3766                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3767                                 clp->cl_ipaddr, port >> 8, port & 255);
3768
3769                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3770                 if (status != -NFS4ERR_CLID_INUSE)
3771                         break;
3772                 if (loop != 0) {
3773                         ++clp->cl_id_uniquifier;
3774                         break;
3775                 }
3776                 ++loop;
3777                 ssleep(clp->cl_lease_time / HZ + 1);
3778         }
3779         return status;
3780 }
3781
3782 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3783                 struct nfs4_setclientid_res *arg,
3784                 struct rpc_cred *cred)
3785 {
3786         struct nfs_fsinfo fsinfo;
3787         struct rpc_message msg = {
3788                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3789                 .rpc_argp = arg,
3790                 .rpc_resp = &fsinfo,
3791                 .rpc_cred = cred,
3792         };
3793         unsigned long now;
3794         int status;
3795
3796         now = jiffies;
3797         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3798         if (status == 0) {
3799                 spin_lock(&clp->cl_lock);
3800                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3801                 clp->cl_last_renewal = now;
3802                 spin_unlock(&clp->cl_lock);
3803         }
3804         return status;
3805 }
3806
3807 struct nfs4_delegreturndata {
3808         struct nfs4_delegreturnargs args;
3809         struct nfs4_delegreturnres res;
3810         struct nfs_fh fh;
3811         nfs4_stateid stateid;
3812         unsigned long timestamp;
3813         struct nfs_fattr fattr;
3814         int rpc_status;
3815 };
3816
3817 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3818 {
3819         struct nfs4_delegreturndata *data = calldata;
3820
3821         if (!nfs4_sequence_done(task, &data->res.seq_res))
3822                 return;
3823
3824         switch (task->tk_status) {
3825         case -NFS4ERR_STALE_STATEID:
3826         case -NFS4ERR_EXPIRED:
3827         case 0:
3828                 renew_lease(data->res.server, data->timestamp);
3829                 break;
3830         default:
3831                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3832                                 -EAGAIN) {
3833                         nfs_restart_rpc(task, data->res.server->nfs_client);
3834                         return;
3835                 }
3836         }
3837         data->rpc_status = task->tk_status;
3838 }
3839
3840 static void nfs4_delegreturn_release(void *calldata)
3841 {
3842         kfree(calldata);
3843 }
3844
3845 #if defined(CONFIG_NFS_V4_1)
3846 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3847 {
3848         struct nfs4_delegreturndata *d_data;
3849
3850         d_data = (struct nfs4_delegreturndata *)data;
3851
3852         if (nfs4_setup_sequence(d_data->res.server,
3853                                 &d_data->args.seq_args,
3854                                 &d_data->res.seq_res, 1, task))
3855                 return;
3856         rpc_call_start(task);
3857 }
3858 #endif /* CONFIG_NFS_V4_1 */
3859
3860 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3861 #if defined(CONFIG_NFS_V4_1)
3862         .rpc_call_prepare = nfs4_delegreturn_prepare,
3863 #endif /* CONFIG_NFS_V4_1 */
3864         .rpc_call_done = nfs4_delegreturn_done,
3865         .rpc_release = nfs4_delegreturn_release,
3866 };
3867
3868 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3869 {
3870         struct nfs4_delegreturndata *data;
3871         struct nfs_server *server = NFS_SERVER(inode);
3872         struct rpc_task *task;
3873         struct rpc_message msg = {
3874                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3875                 .rpc_cred = cred,
3876         };
3877         struct rpc_task_setup task_setup_data = {
3878                 .rpc_client = server->client,
3879                 .rpc_message = &msg,
3880                 .callback_ops = &nfs4_delegreturn_ops,
3881                 .flags = RPC_TASK_ASYNC,
3882         };
3883         int status = 0;
3884
3885         data = kzalloc(sizeof(*data), GFP_NOFS);
3886         if (data == NULL)
3887                 return -ENOMEM;
3888         data->args.fhandle = &data->fh;
3889         data->args.stateid = &data->stateid;
3890         data->args.bitmask = server->attr_bitmask;
3891         nfs_copy_fh(&data->fh, NFS_FH(inode));
3892         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3893         data->res.fattr = &data->fattr;
3894         data->res.server = server;
3895         nfs_fattr_init(data->res.fattr);
3896         data->timestamp = jiffies;
3897         data->rpc_status = 0;
3898
3899         task_setup_data.callback_data = data;
3900         msg.rpc_argp = &data->args;
3901         msg.rpc_resp = &data->res;
3902         task = rpc_run_task(&task_setup_data);
3903         if (IS_ERR(task))
3904                 return PTR_ERR(task);
3905         if (!issync)
3906                 goto out;
3907         status = nfs4_wait_for_completion_rpc_task(task);
3908         if (status != 0)
3909                 goto out;
3910         status = data->rpc_status;
3911         if (status != 0)
3912                 goto out;
3913         nfs_refresh_inode(inode, &data->fattr);
3914 out:
3915         rpc_put_task(task);
3916         return status;
3917 }
3918
3919 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3920 {
3921         struct nfs_server *server = NFS_SERVER(inode);
3922         struct nfs4_exception exception = { };
3923         int err;
3924         do {
3925                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3926                 switch (err) {
3927                         case -NFS4ERR_STALE_STATEID:
3928                         case -NFS4ERR_EXPIRED:
3929                         case 0:
3930                                 return 0;
3931                 }
3932                 err = nfs4_handle_exception(server, err, &exception);
3933         } while (exception.retry);
3934         return err;
3935 }
3936
3937 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3938 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3939
3940 /*
3941  * sleep, with exponential backoff, and retry the LOCK operation.
3942  */
3943 static unsigned long
3944 nfs4_set_lock_task_retry(unsigned long timeout)
3945 {
3946         schedule_timeout_killable(timeout);
3947         timeout <<= 1;
3948         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3949                 return NFS4_LOCK_MAXTIMEOUT;
3950         return timeout;
3951 }
3952
3953 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3954 {
3955         struct inode *inode = state->inode;
3956         struct nfs_server *server = NFS_SERVER(inode);
3957         struct nfs_client *clp = server->nfs_client;
3958         struct nfs_lockt_args arg = {
3959                 .fh = NFS_FH(inode),
3960                 .fl = request,
3961         };
3962         struct nfs_lockt_res res = {
3963                 .denied = request,
3964         };
3965         struct rpc_message msg = {
3966                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3967                 .rpc_argp       = &arg,
3968                 .rpc_resp       = &res,
3969                 .rpc_cred       = state->owner->so_cred,
3970         };
3971         struct nfs4_lock_state *lsp;
3972         int status;
3973
3974         arg.lock_owner.clientid = clp->cl_clientid;
3975         status = nfs4_set_lock_state(state, request);
3976         if (status != 0)
3977                 goto out;
3978         lsp = request->fl_u.nfs4_fl.owner;
3979         arg.lock_owner.id = lsp->ls_id.id;
3980         arg.lock_owner.s_dev = server->s_dev;
3981         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3982         switch (status) {
3983                 case 0:
3984                         request->fl_type = F_UNLCK;
3985                         break;
3986                 case -NFS4ERR_DENIED:
3987                         status = 0;
3988         }
3989         request->fl_ops->fl_release_private(request);
3990 out:
3991         return status;
3992 }
3993
3994 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3995 {
3996         struct nfs4_exception exception = { };
3997         int err;
3998
3999         do {
4000                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4001                                 _nfs4_proc_getlk(state, cmd, request),
4002                                 &exception);
4003         } while (exception.retry);
4004         return err;
4005 }
4006
4007 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4008 {
4009         int res = 0;
4010         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4011                 case FL_POSIX:
4012                         res = posix_lock_file_wait(file, fl);
4013                         break;
4014                 case FL_FLOCK:
4015                         res = flock_lock_file_wait(file, fl);
4016                         break;
4017                 default:
4018                         BUG();
4019         }
4020         return res;
4021 }
4022
4023 struct nfs4_unlockdata {
4024         struct nfs_locku_args arg;
4025         struct nfs_locku_res res;
4026         struct nfs4_lock_state *lsp;
4027         struct nfs_open_context *ctx;
4028         struct file_lock fl;
4029         const struct nfs_server *server;
4030         unsigned long timestamp;
4031 };
4032
4033 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4034                 struct nfs_open_context *ctx,
4035                 struct nfs4_lock_state *lsp,
4036                 struct nfs_seqid *seqid)
4037 {
4038         struct nfs4_unlockdata *p;
4039         struct inode *inode = lsp->ls_state->inode;
4040
4041         p = kzalloc(sizeof(*p), GFP_NOFS);
4042         if (p == NULL)
4043                 return NULL;
4044         p->arg.fh = NFS_FH(inode);
4045         p->arg.fl = &p->fl;
4046         p->arg.seqid = seqid;
4047         p->res.seqid = seqid;
4048         p->arg.stateid = &lsp->ls_stateid;
4049         p->lsp = lsp;
4050         atomic_inc(&lsp->ls_count);
4051         /* Ensure we don't close file until we're done freeing locks! */
4052         p->ctx = get_nfs_open_context(ctx);
4053         memcpy(&p->fl, fl, sizeof(p->fl));
4054         p->server = NFS_SERVER(inode);
4055         return p;
4056 }
4057
4058 static void nfs4_locku_release_calldata(void *data)
4059 {
4060         struct nfs4_unlockdata *calldata = data;
4061         nfs_free_seqid(calldata->arg.seqid);
4062         nfs4_put_lock_state(calldata->lsp);
4063         put_nfs_open_context(calldata->ctx);
4064         kfree(calldata);
4065 }
4066
4067 static void nfs4_locku_done(struct rpc_task *task, void *data)
4068 {
4069         struct nfs4_unlockdata *calldata = data;
4070
4071         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4072                 return;
4073         switch (task->tk_status) {
4074                 case 0:
4075                         memcpy(calldata->lsp->ls_stateid.data,
4076                                         calldata->res.stateid.data,
4077                                         sizeof(calldata->lsp->ls_stateid.data));
4078                         renew_lease(calldata->server, calldata->timestamp);
4079                         break;
4080                 case -NFS4ERR_BAD_STATEID:
4081                 case -NFS4ERR_OLD_STATEID:
4082                 case -NFS4ERR_STALE_STATEID:
4083                 case -NFS4ERR_EXPIRED:
4084                         break;
4085                 default:
4086                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4087                                 nfs_restart_rpc(task,
4088                                                  calldata->server->nfs_client);
4089         }
4090 }
4091
4092 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4093 {
4094         struct nfs4_unlockdata *calldata = data;
4095
4096         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4097                 return;
4098         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4099                 /* Note: exit _without_ running nfs4_locku_done */
4100                 task->tk_action = NULL;
4101                 return;
4102         }
4103         calldata->timestamp = jiffies;
4104         if (nfs4_setup_sequence(calldata->server,
4105                                 &calldata->arg.seq_args,
4106                                 &calldata->res.seq_res, 1, task))
4107                 return;
4108         rpc_call_start(task);
4109 }
4110
4111 static const struct rpc_call_ops nfs4_locku_ops = {
4112         .rpc_call_prepare = nfs4_locku_prepare,
4113         .rpc_call_done = nfs4_locku_done,
4114         .rpc_release = nfs4_locku_release_calldata,
4115 };
4116
4117 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4118                 struct nfs_open_context *ctx,
4119                 struct nfs4_lock_state *lsp,
4120                 struct nfs_seqid *seqid)
4121 {
4122         struct nfs4_unlockdata *data;
4123         struct rpc_message msg = {
4124                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4125                 .rpc_cred = ctx->cred,
4126         };
4127         struct rpc_task_setup task_setup_data = {
4128                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4129                 .rpc_message = &msg,
4130                 .callback_ops = &nfs4_locku_ops,
4131                 .workqueue = nfsiod_workqueue,
4132                 .flags = RPC_TASK_ASYNC,
4133         };
4134
4135         /* Ensure this is an unlock - when canceling a lock, the
4136          * canceled lock is passed in, and it won't be an unlock.
4137          */
4138         fl->fl_type = F_UNLCK;
4139
4140         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4141         if (data == NULL) {
4142                 nfs_free_seqid(seqid);
4143                 return ERR_PTR(-ENOMEM);
4144         }
4145
4146         msg.rpc_argp = &data->arg;
4147         msg.rpc_resp = &data->res;
4148         task_setup_data.callback_data = data;
4149         return rpc_run_task(&task_setup_data);
4150 }
4151
4152 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4153 {
4154         struct nfs_inode *nfsi = NFS_I(state->inode);
4155         struct nfs_seqid *seqid;
4156         struct nfs4_lock_state *lsp;
4157         struct rpc_task *task;
4158         int status = 0;
4159         unsigned char fl_flags = request->fl_flags;
4160
4161         status = nfs4_set_lock_state(state, request);
4162         /* Unlock _before_ we do the RPC call */
4163         request->fl_flags |= FL_EXISTS;
4164         down_read(&nfsi->rwsem);
4165         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4166                 up_read(&nfsi->rwsem);
4167                 goto out;
4168         }
4169         up_read(&nfsi->rwsem);
4170         if (status != 0)
4171                 goto out;
4172         /* Is this a delegated lock? */
4173         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4174                 goto out;
4175         lsp = request->fl_u.nfs4_fl.owner;
4176         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4177         status = -ENOMEM;
4178         if (seqid == NULL)
4179                 goto out;
4180         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4181         status = PTR_ERR(task);
4182         if (IS_ERR(task))
4183                 goto out;
4184         status = nfs4_wait_for_completion_rpc_task(task);
4185         rpc_put_task(task);
4186 out:
4187         request->fl_flags = fl_flags;
4188         return status;
4189 }
4190
4191 struct nfs4_lockdata {
4192         struct nfs_lock_args arg;
4193         struct nfs_lock_res res;
4194         struct nfs4_lock_state *lsp;
4195         struct nfs_open_context *ctx;
4196         struct file_lock fl;
4197         unsigned long timestamp;
4198         int rpc_status;
4199         int cancelled;
4200         struct nfs_server *server;
4201 };
4202
4203 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4204                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4205                 gfp_t gfp_mask)
4206 {
4207         struct nfs4_lockdata *p;
4208         struct inode *inode = lsp->ls_state->inode;
4209         struct nfs_server *server = NFS_SERVER(inode);
4210
4211         p = kzalloc(sizeof(*p), gfp_mask);
4212         if (p == NULL)
4213                 return NULL;
4214
4215         p->arg.fh = NFS_FH(inode);
4216         p->arg.fl = &p->fl;
4217         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4218         if (p->arg.open_seqid == NULL)
4219                 goto out_free;
4220         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4221         if (p->arg.lock_seqid == NULL)
4222                 goto out_free_seqid;
4223         p->arg.lock_stateid = &lsp->ls_stateid;
4224         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4225         p->arg.lock_owner.id = lsp->ls_id.id;
4226         p->arg.lock_owner.s_dev = server->s_dev;
4227         p->res.lock_seqid = p->arg.lock_seqid;
4228         p->lsp = lsp;
4229         p->server = server;
4230         atomic_inc(&lsp->ls_count);
4231         p->ctx = get_nfs_open_context(ctx);
4232         memcpy(&p->fl, fl, sizeof(p->fl));
4233         return p;
4234 out_free_seqid:
4235         nfs_free_seqid(p->arg.open_seqid);
4236 out_free:
4237         kfree(p);
4238         return NULL;
4239 }
4240
4241 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4242 {
4243         struct nfs4_lockdata *data = calldata;
4244         struct nfs4_state *state = data->lsp->ls_state;
4245
4246         dprintk("%s: begin!\n", __func__);
4247         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4248                 return;
4249         /* Do we need to do an open_to_lock_owner? */
4250         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4251                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4252                         return;
4253                 data->arg.open_stateid = &state->stateid;
4254                 data->arg.new_lock_owner = 1;
4255                 data->res.open_seqid = data->arg.open_seqid;
4256         } else
4257                 data->arg.new_lock_owner = 0;
4258         data->timestamp = jiffies;
4259         if (nfs4_setup_sequence(data->server,
4260                                 &data->arg.seq_args,
4261                                 &data->res.seq_res, 1, task))
4262                 return;
4263         rpc_call_start(task);
4264         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4265 }
4266
4267 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4268 {
4269         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4270         nfs4_lock_prepare(task, calldata);
4271 }
4272
4273 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4274 {
4275         struct nfs4_lockdata *data = calldata;
4276
4277         dprintk("%s: begin!\n", __func__);
4278
4279         if (!nfs4_sequence_done(task, &data->res.seq_res))
4280                 return;
4281
4282         data->rpc_status = task->tk_status;
4283         if (data->arg.new_lock_owner != 0) {
4284                 if (data->rpc_status == 0)
4285                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4286                 else
4287                         goto out;
4288         }
4289         if (data->rpc_status == 0) {
4290                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4291                                         sizeof(data->lsp->ls_stateid.data));
4292                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4293                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4294         }
4295 out:
4296         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4297 }
4298
4299 static void nfs4_lock_release(void *calldata)
4300 {
4301         struct nfs4_lockdata *data = calldata;
4302
4303         dprintk("%s: begin!\n", __func__);
4304         nfs_free_seqid(data->arg.open_seqid);
4305         if (data->cancelled != 0) {
4306                 struct rpc_task *task;
4307                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4308                                 data->arg.lock_seqid);
4309                 if (!IS_ERR(task))
4310                         rpc_put_task_async(task);
4311                 dprintk("%s: cancelling lock!\n", __func__);
4312         } else
4313                 nfs_free_seqid(data->arg.lock_seqid);
4314         nfs4_put_lock_state(data->lsp);
4315         put_nfs_open_context(data->ctx);
4316         kfree(data);
4317         dprintk("%s: done!\n", __func__);
4318 }
4319
4320 static const struct rpc_call_ops nfs4_lock_ops = {
4321         .rpc_call_prepare = nfs4_lock_prepare,
4322         .rpc_call_done = nfs4_lock_done,
4323         .rpc_release = nfs4_lock_release,
4324 };
4325
4326 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4327         .rpc_call_prepare = nfs4_recover_lock_prepare,
4328         .rpc_call_done = nfs4_lock_done,
4329         .rpc_release = nfs4_lock_release,
4330 };
4331
4332 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4333 {
4334         switch (error) {
4335         case -NFS4ERR_ADMIN_REVOKED:
4336         case -NFS4ERR_BAD_STATEID:
4337                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4338                 if (new_lock_owner != 0 ||
4339                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4340                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4341                 break;
4342         case -NFS4ERR_STALE_STATEID:
4343                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4344         case -NFS4ERR_EXPIRED:
4345                 nfs4_schedule_lease_recovery(server->nfs_client);
4346         };
4347 }
4348
4349 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4350 {
4351         struct nfs4_lockdata *data;
4352         struct rpc_task *task;
4353         struct rpc_message msg = {
4354                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4355                 .rpc_cred = state->owner->so_cred,
4356         };
4357         struct rpc_task_setup task_setup_data = {
4358                 .rpc_client = NFS_CLIENT(state->inode),
4359                 .rpc_message = &msg,
4360                 .callback_ops = &nfs4_lock_ops,
4361                 .workqueue = nfsiod_workqueue,
4362                 .flags = RPC_TASK_ASYNC,
4363         };
4364         int ret;
4365
4366         dprintk("%s: begin!\n", __func__);
4367         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4368                         fl->fl_u.nfs4_fl.owner,
4369                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4370         if (data == NULL)
4371                 return -ENOMEM;
4372         if (IS_SETLKW(cmd))
4373                 data->arg.block = 1;
4374         if (recovery_type > NFS_LOCK_NEW) {
4375                 if (recovery_type == NFS_LOCK_RECLAIM)
4376                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4377                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4378         }
4379         msg.rpc_argp = &data->arg;
4380         msg.rpc_resp = &data->res;
4381         task_setup_data.callback_data = data;
4382         task = rpc_run_task(&task_setup_data);
4383         if (IS_ERR(task))
4384                 return PTR_ERR(task);
4385         ret = nfs4_wait_for_completion_rpc_task(task);
4386         if (ret == 0) {
4387                 ret = data->rpc_status;
4388                 if (ret)
4389                         nfs4_handle_setlk_error(data->server, data->lsp,
4390                                         data->arg.new_lock_owner, ret);
4391         } else
4392                 data->cancelled = 1;
4393         rpc_put_task(task);
4394         dprintk("%s: done, ret = %d!\n", __func__, ret);
4395         return ret;
4396 }
4397
4398 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4399 {
4400         struct nfs_server *server = NFS_SERVER(state->inode);
4401         struct nfs4_exception exception = { };
4402         int err;
4403
4404         do {
4405                 /* Cache the lock if possible... */
4406                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4407                         return 0;
4408                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4409                 if (err != -NFS4ERR_DELAY)
4410                         break;
4411                 nfs4_handle_exception(server, err, &exception);
4412         } while (exception.retry);
4413         return err;
4414 }
4415
4416 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4417 {
4418         struct nfs_server *server = NFS_SERVER(state->inode);
4419         struct nfs4_exception exception = { };
4420         int err;
4421
4422         err = nfs4_set_lock_state(state, request);
4423         if (err != 0)
4424                 return err;
4425         do {
4426                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4427                         return 0;
4428                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4429                 switch (err) {
4430                 default:
4431                         goto out;
4432                 case -NFS4ERR_GRACE:
4433                 case -NFS4ERR_DELAY:
4434                         nfs4_handle_exception(server, err, &exception);
4435                         err = 0;
4436                 }
4437         } while (exception.retry);
4438 out:
4439         return err;
4440 }
4441
4442 #if defined(CONFIG_NFS_V4_1)
4443 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4444 {
4445         int status;
4446         struct nfs_server *server = NFS_SERVER(state->inode);
4447
4448         status = nfs41_test_stateid(server, state);
4449         if (status == NFS_OK)
4450                 return 0;
4451         nfs41_free_stateid(server, state);
4452         return nfs4_lock_expired(state, request);
4453 }
4454 #endif
4455
4456 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4457 {
4458         struct nfs_inode *nfsi = NFS_I(state->inode);
4459         unsigned char fl_flags = request->fl_flags;
4460         int status = -ENOLCK;
4461
4462         if ((fl_flags & FL_POSIX) &&
4463                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4464                 goto out;
4465         /* Is this a delegated open? */
4466         status = nfs4_set_lock_state(state, request);
4467         if (status != 0)
4468                 goto out;
4469         request->fl_flags |= FL_ACCESS;
4470         status = do_vfs_lock(request->fl_file, request);
4471         if (status < 0)
4472                 goto out;
4473         down_read(&nfsi->rwsem);
4474         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4475                 /* Yes: cache locks! */
4476                 /* ...but avoid races with delegation recall... */
4477                 request->fl_flags = fl_flags & ~FL_SLEEP;
4478                 status = do_vfs_lock(request->fl_file, request);
4479                 goto out_unlock;
4480         }
4481         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4482         if (status != 0)
4483                 goto out_unlock;
4484         /* Note: we always want to sleep here! */
4485         request->fl_flags = fl_flags | FL_SLEEP;
4486         if (do_vfs_lock(request->fl_file, request) < 0)
4487                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4488 out_unlock:
4489         up_read(&nfsi->rwsem);
4490 out:
4491         request->fl_flags = fl_flags;
4492         return status;
4493 }
4494
4495 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4496 {
4497         struct nfs4_exception exception = { };
4498         int err;
4499
4500         do {
4501                 err = _nfs4_proc_setlk(state, cmd, request);
4502                 if (err == -NFS4ERR_DENIED)
4503                         err = -EAGAIN;
4504                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4505                                 err, &exception);
4506         } while (exception.retry);
4507         return err;
4508 }
4509
4510 static int
4511 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4512 {
4513         struct nfs_open_context *ctx;
4514         struct nfs4_state *state;
4515         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4516         int status;
4517
4518         /* verify open state */
4519         ctx = nfs_file_open_context(filp);
4520         state = ctx->state;
4521
4522         if (request->fl_start < 0 || request->fl_end < 0)
4523                 return -EINVAL;
4524
4525         if (IS_GETLK(cmd)) {
4526                 if (state != NULL)
4527                         return nfs4_proc_getlk(state, F_GETLK, request);
4528                 return 0;
4529         }
4530
4531         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4532                 return -EINVAL;
4533
4534         if (request->fl_type == F_UNLCK) {
4535                 if (state != NULL)
4536                         return nfs4_proc_unlck(state, cmd, request);
4537                 return 0;
4538         }
4539
4540         if (state == NULL)
4541                 return -ENOLCK;
4542         do {
4543                 status = nfs4_proc_setlk(state, cmd, request);
4544                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4545                         break;
4546                 timeout = nfs4_set_lock_task_retry(timeout);
4547                 status = -ERESTARTSYS;
4548                 if (signalled())
4549                         break;
4550         } while(status < 0);
4551         return status;
4552 }
4553
4554 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4555 {
4556         struct nfs_server *server = NFS_SERVER(state->inode);
4557         struct nfs4_exception exception = { };
4558         int err;
4559
4560         err = nfs4_set_lock_state(state, fl);
4561         if (err != 0)
4562                 goto out;
4563         do {
4564                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4565                 switch (err) {
4566                         default:
4567                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4568                                                 __func__, err);
4569                         case 0:
4570                         case -ESTALE:
4571                                 goto out;
4572                         case -NFS4ERR_EXPIRED:
4573                                 nfs4_schedule_stateid_recovery(server, state);
4574                         case -NFS4ERR_STALE_CLIENTID:
4575                         case -NFS4ERR_STALE_STATEID:
4576                                 nfs4_schedule_lease_recovery(server->nfs_client);
4577                                 goto out;
4578                         case -NFS4ERR_BADSESSION:
4579                         case -NFS4ERR_BADSLOT:
4580                         case -NFS4ERR_BAD_HIGH_SLOT:
4581                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4582                         case -NFS4ERR_DEADSESSION:
4583                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4584                                 goto out;
4585                         case -ERESTARTSYS:
4586                                 /*
4587                                  * The show must go on: exit, but mark the
4588                                  * stateid as needing recovery.
4589                                  */
4590                         case -NFS4ERR_ADMIN_REVOKED:
4591                         case -NFS4ERR_BAD_STATEID:
4592                         case -NFS4ERR_OPENMODE:
4593                                 nfs4_schedule_stateid_recovery(server, state);
4594                                 err = 0;
4595                                 goto out;
4596                         case -EKEYEXPIRED:
4597                                 /*
4598                                  * User RPCSEC_GSS context has expired.
4599                                  * We cannot recover this stateid now, so
4600                                  * skip it and allow recovery thread to
4601                                  * proceed.
4602                                  */
4603                                 err = 0;
4604                                 goto out;
4605                         case -ENOMEM:
4606                         case -NFS4ERR_DENIED:
4607                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4608                                 err = 0;
4609                                 goto out;
4610                         case -NFS4ERR_DELAY:
4611                                 break;
4612                 }
4613                 err = nfs4_handle_exception(server, err, &exception);
4614         } while (exception.retry);
4615 out:
4616         return err;
4617 }
4618
4619 static void nfs4_release_lockowner_release(void *calldata)
4620 {
4621         kfree(calldata);
4622 }
4623
4624 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4625         .rpc_release = nfs4_release_lockowner_release,
4626 };
4627
4628 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4629 {
4630         struct nfs_server *server = lsp->ls_state->owner->so_server;
4631         struct nfs_release_lockowner_args *args;
4632         struct rpc_message msg = {
4633                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4634         };
4635
4636         if (server->nfs_client->cl_mvops->minor_version != 0)
4637                 return;
4638         args = kmalloc(sizeof(*args), GFP_NOFS);
4639         if (!args)
4640                 return;
4641         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4642         args->lock_owner.id = lsp->ls_id.id;
4643         args->lock_owner.s_dev = server->s_dev;
4644         msg.rpc_argp = args;
4645         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4646 }
4647
4648 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4649
4650 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4651                                    const void *buf, size_t buflen,
4652                                    int flags, int type)
4653 {
4654         if (strcmp(key, "") != 0)
4655                 return -EINVAL;
4656
4657         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4658 }
4659
4660 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4661                                    void *buf, size_t buflen, int type)
4662 {
4663         if (strcmp(key, "") != 0)
4664                 return -EINVAL;
4665
4666         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4667 }
4668
4669 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4670                                        size_t list_len, const char *name,
4671                                        size_t name_len, int type)
4672 {
4673         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4674
4675         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4676                 return 0;
4677
4678         if (list && len <= list_len)
4679                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4680         return len;
4681 }
4682
4683 /*
4684  * nfs_fhget will use either the mounted_on_fileid or the fileid
4685  */
4686 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4687 {
4688         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4689                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4690               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4691               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4692                 return;
4693
4694         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4695                 NFS_ATTR_FATTR_NLINK;
4696         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4697         fattr->nlink = 2;
4698 }
4699
4700 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4701                 struct nfs4_fs_locations *fs_locations, struct page *page)
4702 {
4703         struct nfs_server *server = NFS_SERVER(dir);
4704         u32 bitmask[2] = {
4705                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4706         };
4707         struct nfs4_fs_locations_arg args = {
4708                 .dir_fh = NFS_FH(dir),
4709                 .name = name,
4710                 .page = page,
4711                 .bitmask = bitmask,
4712         };
4713         struct nfs4_fs_locations_res res = {
4714                 .fs_locations = fs_locations,
4715         };
4716         struct rpc_message msg = {
4717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4718                 .rpc_argp = &args,
4719                 .rpc_resp = &res,
4720         };
4721         int status;
4722
4723         dprintk("%s: start\n", __func__);
4724
4725         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4726          * is not supported */
4727         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4728                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4729         else
4730                 bitmask[0] |= FATTR4_WORD0_FILEID;
4731
4732         nfs_fattr_init(&fs_locations->fattr);
4733         fs_locations->server = server;
4734         fs_locations->nlocations = 0;
4735         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4736         dprintk("%s: returned status = %d\n", __func__, status);
4737         return status;
4738 }
4739
4740 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4741 {
4742         int status;
4743         struct nfs4_secinfo_arg args = {
4744                 .dir_fh = NFS_FH(dir),
4745                 .name   = name,
4746         };
4747         struct nfs4_secinfo_res res = {
4748                 .flavors     = flavors,
4749         };
4750         struct rpc_message msg = {
4751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4752                 .rpc_argp = &args,
4753                 .rpc_resp = &res,
4754         };
4755
4756         dprintk("NFS call  secinfo %s\n", name->name);
4757         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4758         dprintk("NFS reply  secinfo: %d\n", status);
4759         return status;
4760 }
4761
4762 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4763 {
4764         struct nfs4_exception exception = { };
4765         int err;
4766         do {
4767                 err = nfs4_handle_exception(NFS_SERVER(dir),
4768                                 _nfs4_proc_secinfo(dir, name, flavors),
4769                                 &exception);
4770         } while (exception.retry);
4771         return err;
4772 }
4773
4774 #ifdef CONFIG_NFS_V4_1
4775 /*
4776  * Check the exchange flags returned by the server for invalid flags, having
4777  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4778  * DS flags set.
4779  */
4780 static int nfs4_check_cl_exchange_flags(u32 flags)
4781 {
4782         if (flags & ~EXCHGID4_FLAG_MASK_R)
4783                 goto out_inval;
4784         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4785             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4786                 goto out_inval;
4787         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4788                 goto out_inval;
4789         return NFS_OK;
4790 out_inval:
4791         return -NFS4ERR_INVAL;
4792 }
4793
4794 static bool
4795 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4796 {
4797         if (a->server_scope_sz == b->server_scope_sz &&
4798             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4799                 return true;
4800
4801         return false;
4802 }
4803
4804 /*
4805  * nfs4_proc_exchange_id()
4806  *
4807  * Since the clientid has expired, all compounds using sessions
4808  * associated with the stale clientid will be returning
4809  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4810  * be in some phase of session reset.
4811  */
4812 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4813 {
4814         nfs4_verifier verifier;
4815         struct nfs41_exchange_id_args args = {
4816                 .client = clp,
4817                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4818         };
4819         struct nfs41_exchange_id_res res = {
4820                 .client = clp,
4821         };
4822         int status;
4823         struct rpc_message msg = {
4824                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4825                 .rpc_argp = &args,
4826                 .rpc_resp = &res,
4827                 .rpc_cred = cred,
4828         };
4829         __be32 *p;
4830
4831         dprintk("--> %s\n", __func__);
4832         BUG_ON(clp == NULL);
4833
4834         p = (u32 *)verifier.data;
4835         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4836         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4837         args.verifier = &verifier;
4838
4839         args.id_len = scnprintf(args.id, sizeof(args.id),
4840                                 "%s/%s.%s/%u",
4841                                 clp->cl_ipaddr,
4842                                 init_utsname()->nodename,
4843                                 init_utsname()->domainname,
4844                                 clp->cl_rpcclient->cl_auth->au_flavor);
4845
4846         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4847         if (unlikely(!res.server_scope))
4848                 return -ENOMEM;
4849
4850         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4851         if (!status)
4852                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4853
4854         if (!status) {
4855                 if (clp->server_scope &&
4856                     !nfs41_same_server_scope(clp->server_scope,
4857                                              res.server_scope)) {
4858                         dprintk("%s: server_scope mismatch detected\n",
4859                                 __func__);
4860                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4861                         kfree(clp->server_scope);
4862                         clp->server_scope = NULL;
4863                 }
4864
4865                 if (!clp->server_scope)
4866                         clp->server_scope = res.server_scope;
4867                 else
4868                         kfree(res.server_scope);
4869         }
4870
4871         dprintk("<-- %s status= %d\n", __func__, status);
4872         return status;
4873 }
4874
4875 struct nfs4_get_lease_time_data {
4876         struct nfs4_get_lease_time_args *args;
4877         struct nfs4_get_lease_time_res *res;
4878         struct nfs_client *clp;
4879 };
4880
4881 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4882                                         void *calldata)
4883 {
4884         int ret;
4885         struct nfs4_get_lease_time_data *data =
4886                         (struct nfs4_get_lease_time_data *)calldata;
4887
4888         dprintk("--> %s\n", __func__);
4889         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4890         /* just setup sequence, do not trigger session recovery
4891            since we're invoked within one */
4892         ret = nfs41_setup_sequence(data->clp->cl_session,
4893                                    &data->args->la_seq_args,
4894                                    &data->res->lr_seq_res, 0, task);
4895
4896         BUG_ON(ret == -EAGAIN);
4897         rpc_call_start(task);
4898         dprintk("<-- %s\n", __func__);
4899 }
4900
4901 /*
4902  * Called from nfs4_state_manager thread for session setup, so don't recover
4903  * from sequence operation or clientid errors.
4904  */
4905 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4906 {
4907         struct nfs4_get_lease_time_data *data =
4908                         (struct nfs4_get_lease_time_data *)calldata;
4909
4910         dprintk("--> %s\n", __func__);
4911         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4912                 return;
4913         switch (task->tk_status) {
4914         case -NFS4ERR_DELAY:
4915         case -NFS4ERR_GRACE:
4916                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4917                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4918                 task->tk_status = 0;
4919                 /* fall through */
4920         case -NFS4ERR_RETRY_UNCACHED_REP:
4921                 nfs_restart_rpc(task, data->clp);
4922                 return;
4923         }
4924         dprintk("<-- %s\n", __func__);
4925 }
4926
4927 struct rpc_call_ops nfs4_get_lease_time_ops = {
4928         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4929         .rpc_call_done = nfs4_get_lease_time_done,
4930 };
4931
4932 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4933 {
4934         struct rpc_task *task;
4935         struct nfs4_get_lease_time_args args;
4936         struct nfs4_get_lease_time_res res = {
4937                 .lr_fsinfo = fsinfo,
4938         };
4939         struct nfs4_get_lease_time_data data = {
4940                 .args = &args,
4941                 .res = &res,
4942                 .clp = clp,
4943         };
4944         struct rpc_message msg = {
4945                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4946                 .rpc_argp = &args,
4947                 .rpc_resp = &res,
4948         };
4949         struct rpc_task_setup task_setup = {
4950                 .rpc_client = clp->cl_rpcclient,
4951                 .rpc_message = &msg,
4952                 .callback_ops = &nfs4_get_lease_time_ops,
4953                 .callback_data = &data,
4954                 .flags = RPC_TASK_TIMEOUT,
4955         };
4956         int status;
4957
4958         dprintk("--> %s\n", __func__);
4959         task = rpc_run_task(&task_setup);
4960
4961         if (IS_ERR(task))
4962                 status = PTR_ERR(task);
4963         else {
4964                 status = task->tk_status;
4965                 rpc_put_task(task);
4966         }
4967         dprintk("<-- %s return %d\n", __func__, status);
4968
4969         return status;
4970 }
4971
4972 /*
4973  * Reset a slot table
4974  */
4975 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4976                                  int ivalue)
4977 {
4978         struct nfs4_slot *new = NULL;
4979         int i;
4980         int ret = 0;
4981
4982         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4983                 max_reqs, tbl->max_slots);
4984
4985         /* Does the newly negotiated max_reqs match the existing slot table? */
4986         if (max_reqs != tbl->max_slots) {
4987                 ret = -ENOMEM;
4988                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4989                               GFP_NOFS);
4990                 if (!new)
4991                         goto out;
4992                 ret = 0;
4993                 kfree(tbl->slots);
4994         }
4995         spin_lock(&tbl->slot_tbl_lock);
4996         if (new) {
4997                 tbl->slots = new;
4998                 tbl->max_slots = max_reqs;
4999         }
5000         for (i = 0; i < tbl->max_slots; ++i)
5001                 tbl->slots[i].seq_nr = ivalue;
5002         spin_unlock(&tbl->slot_tbl_lock);
5003         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5004                 tbl, tbl->slots, tbl->max_slots);
5005 out:
5006         dprintk("<-- %s: return %d\n", __func__, ret);
5007         return ret;
5008 }
5009
5010 /*
5011  * Reset the forechannel and backchannel slot tables
5012  */
5013 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5014 {
5015         int status;
5016
5017         status = nfs4_reset_slot_table(&session->fc_slot_table,
5018                         session->fc_attrs.max_reqs, 1);
5019         if (status)
5020                 return status;
5021
5022         status = nfs4_reset_slot_table(&session->bc_slot_table,
5023                         session->bc_attrs.max_reqs, 0);
5024         return status;
5025 }
5026
5027 /* Destroy the slot table */
5028 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5029 {
5030         if (session->fc_slot_table.slots != NULL) {
5031                 kfree(session->fc_slot_table.slots);
5032                 session->fc_slot_table.slots = NULL;
5033         }
5034         if (session->bc_slot_table.slots != NULL) {
5035                 kfree(session->bc_slot_table.slots);
5036                 session->bc_slot_table.slots = NULL;
5037         }
5038         return;
5039 }
5040
5041 /*
5042  * Initialize slot table
5043  */
5044 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5045                 int max_slots, int ivalue)
5046 {
5047         struct nfs4_slot *slot;
5048         int ret = -ENOMEM;
5049
5050         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5051
5052         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5053
5054         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5055         if (!slot)
5056                 goto out;
5057         ret = 0;
5058
5059         spin_lock(&tbl->slot_tbl_lock);
5060         tbl->max_slots = max_slots;
5061         tbl->slots = slot;
5062         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5063         spin_unlock(&tbl->slot_tbl_lock);
5064         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5065                 tbl, tbl->slots, tbl->max_slots);
5066 out:
5067         dprintk("<-- %s: return %d\n", __func__, ret);
5068         return ret;
5069 }
5070
5071 /*
5072  * Initialize the forechannel and backchannel tables
5073  */
5074 static int nfs4_init_slot_tables(struct nfs4_session *session)
5075 {
5076         struct nfs4_slot_table *tbl;
5077         int status = 0;
5078
5079         tbl = &session->fc_slot_table;
5080         if (tbl->slots == NULL) {
5081                 status = nfs4_init_slot_table(tbl,
5082                                 session->fc_attrs.max_reqs, 1);
5083                 if (status)
5084                         return status;
5085         }
5086
5087         tbl = &session->bc_slot_table;
5088         if (tbl->slots == NULL) {
5089                 status = nfs4_init_slot_table(tbl,
5090                                 session->bc_attrs.max_reqs, 0);
5091                 if (status)
5092                         nfs4_destroy_slot_tables(session);
5093         }
5094
5095         return status;
5096 }
5097
5098 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5099 {
5100         struct nfs4_session *session;
5101         struct nfs4_slot_table *tbl;
5102
5103         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5104         if (!session)
5105                 return NULL;
5106
5107         tbl = &session->fc_slot_table;
5108         tbl->highest_used_slotid = -1;
5109         spin_lock_init(&tbl->slot_tbl_lock);
5110         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5111         init_completion(&tbl->complete);
5112
5113         tbl = &session->bc_slot_table;
5114         tbl->highest_used_slotid = -1;
5115         spin_lock_init(&tbl->slot_tbl_lock);
5116         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5117         init_completion(&tbl->complete);
5118
5119         session->session_state = 1<<NFS4_SESSION_INITING;
5120
5121         session->clp = clp;
5122         return session;
5123 }
5124
5125 void nfs4_destroy_session(struct nfs4_session *session)
5126 {
5127         nfs4_proc_destroy_session(session);
5128         dprintk("%s Destroy backchannel for xprt %p\n",
5129                 __func__, session->clp->cl_rpcclient->cl_xprt);
5130         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5131                                 NFS41_BC_MIN_CALLBACKS);
5132         nfs4_destroy_slot_tables(session);
5133         kfree(session);
5134 }
5135
5136 /*
5137  * Initialize the values to be used by the client in CREATE_SESSION
5138  * If nfs4_init_session set the fore channel request and response sizes,
5139  * use them.
5140  *
5141  * Set the back channel max_resp_sz_cached to zero to force the client to
5142  * always set csa_cachethis to FALSE because the current implementation
5143  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5144  */
5145 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5146 {
5147         struct nfs4_session *session = args->client->cl_session;
5148         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5149                      mxresp_sz = session->fc_attrs.max_resp_sz;
5150
5151         if (mxrqst_sz == 0)
5152                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5153         if (mxresp_sz == 0)
5154                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5155         /* Fore channel attributes */
5156         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5157         args->fc_attrs.max_resp_sz = mxresp_sz;
5158         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5159         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5160
5161         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5162                 "max_ops=%u max_reqs=%u\n",
5163                 __func__,
5164                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5165                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5166
5167         /* Back channel attributes */
5168         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5169         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5170         args->bc_attrs.max_resp_sz_cached = 0;
5171         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5172         args->bc_attrs.max_reqs = 1;
5173
5174         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5175                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5176                 __func__,
5177                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5178                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5179                 args->bc_attrs.max_reqs);
5180 }
5181
5182 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5183 {
5184         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5185         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5186
5187         if (rcvd->max_resp_sz > sent->max_resp_sz)
5188                 return -EINVAL;
5189         /*
5190          * Our requested max_ops is the minimum we need; we're not
5191          * prepared to break up compounds into smaller pieces than that.
5192          * So, no point even trying to continue if the server won't
5193          * cooperate:
5194          */
5195         if (rcvd->max_ops < sent->max_ops)
5196                 return -EINVAL;
5197         if (rcvd->max_reqs == 0)
5198                 return -EINVAL;
5199         return 0;
5200 }
5201
5202 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5203 {
5204         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5205         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5206
5207         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5208                 return -EINVAL;
5209         if (rcvd->max_resp_sz < sent->max_resp_sz)
5210                 return -EINVAL;
5211         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5212                 return -EINVAL;
5213         /* These would render the backchannel useless: */
5214         if (rcvd->max_ops  == 0)
5215                 return -EINVAL;
5216         if (rcvd->max_reqs == 0)
5217                 return -EINVAL;
5218         return 0;
5219 }
5220
5221 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5222                                      struct nfs4_session *session)
5223 {
5224         int ret;
5225
5226         ret = nfs4_verify_fore_channel_attrs(args, session);
5227         if (ret)
5228                 return ret;
5229         return nfs4_verify_back_channel_attrs(args, session);
5230 }
5231
5232 static int _nfs4_proc_create_session(struct nfs_client *clp)
5233 {
5234         struct nfs4_session *session = clp->cl_session;
5235         struct nfs41_create_session_args args = {
5236                 .client = clp,
5237                 .cb_program = NFS4_CALLBACK,
5238         };
5239         struct nfs41_create_session_res res = {
5240                 .client = clp,
5241         };
5242         struct rpc_message msg = {
5243                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5244                 .rpc_argp = &args,
5245                 .rpc_resp = &res,
5246         };
5247         int status;
5248
5249         nfs4_init_channel_attrs(&args);
5250         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5251
5252         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5253
5254         if (!status)
5255                 /* Verify the session's negotiated channel_attrs values */
5256                 status = nfs4_verify_channel_attrs(&args, session);
5257         if (!status) {
5258                 /* Increment the clientid slot sequence id */
5259                 clp->cl_seqid++;
5260         }
5261
5262         return status;
5263 }
5264
5265 /*
5266  * Issues a CREATE_SESSION operation to the server.
5267  * It is the responsibility of the caller to verify the session is
5268  * expired before calling this routine.
5269  */
5270 int nfs4_proc_create_session(struct nfs_client *clp)
5271 {
5272         int status;
5273         unsigned *ptr;
5274         struct nfs4_session *session = clp->cl_session;
5275
5276         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5277
5278         status = _nfs4_proc_create_session(clp);
5279         if (status)
5280                 goto out;
5281
5282         /* Init and reset the fore channel */
5283         status = nfs4_init_slot_tables(session);
5284         dprintk("slot table initialization returned %d\n", status);
5285         if (status)
5286                 goto out;
5287         status = nfs4_reset_slot_tables(session);
5288         dprintk("slot table reset returned %d\n", status);
5289         if (status)
5290                 goto out;
5291
5292         ptr = (unsigned *)&session->sess_id.data[0];
5293         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5294                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5295 out:
5296         dprintk("<-- %s\n", __func__);
5297         return status;
5298 }
5299
5300 /*
5301  * Issue the over-the-wire RPC DESTROY_SESSION.
5302  * The caller must serialize access to this routine.
5303  */
5304 int nfs4_proc_destroy_session(struct nfs4_session *session)
5305 {
5306         int status = 0;
5307         struct rpc_message msg;
5308
5309         dprintk("--> nfs4_proc_destroy_session\n");
5310
5311         /* session is still being setup */
5312         if (session->clp->cl_cons_state != NFS_CS_READY)
5313                 return status;
5314
5315         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5316         msg.rpc_argp = session;
5317         msg.rpc_resp = NULL;
5318         msg.rpc_cred = NULL;
5319         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5320
5321         if (status)
5322                 printk(KERN_WARNING
5323                         "Got error %d from the server on DESTROY_SESSION. "
5324                         "Session has been destroyed regardless...\n", status);
5325
5326         dprintk("<-- nfs4_proc_destroy_session\n");
5327         return status;
5328 }
5329
5330 int nfs4_init_session(struct nfs_server *server)
5331 {
5332         struct nfs_client *clp = server->nfs_client;
5333         struct nfs4_session *session;
5334         unsigned int rsize, wsize;
5335         int ret;
5336
5337         if (!nfs4_has_session(clp))
5338                 return 0;
5339
5340         session = clp->cl_session;
5341         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5342                 return 0;
5343
5344         rsize = server->rsize;
5345         if (rsize == 0)
5346                 rsize = NFS_MAX_FILE_IO_SIZE;
5347         wsize = server->wsize;
5348         if (wsize == 0)
5349                 wsize = NFS_MAX_FILE_IO_SIZE;
5350
5351         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5352         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5353
5354         ret = nfs4_recover_expired_lease(server);
5355         if (!ret)
5356                 ret = nfs4_check_client_ready(clp);
5357         return ret;
5358 }
5359
5360 int nfs4_init_ds_session(struct nfs_client *clp)
5361 {
5362         struct nfs4_session *session = clp->cl_session;
5363         int ret;
5364
5365         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5366                 return 0;
5367
5368         ret = nfs4_client_recover_expired_lease(clp);
5369         if (!ret)
5370                 /* Test for the DS role */
5371                 if (!is_ds_client(clp))
5372                         ret = -ENODEV;
5373         if (!ret)
5374                 ret = nfs4_check_client_ready(clp);
5375         return ret;
5376
5377 }
5378 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5379
5380
5381 /*
5382  * Renew the cl_session lease.
5383  */
5384 struct nfs4_sequence_data {
5385         struct nfs_client *clp;
5386         struct nfs4_sequence_args args;
5387         struct nfs4_sequence_res res;
5388 };
5389
5390 static void nfs41_sequence_release(void *data)
5391 {
5392         struct nfs4_sequence_data *calldata = data;
5393         struct nfs_client *clp = calldata->clp;
5394
5395         if (atomic_read(&clp->cl_count) > 1)
5396                 nfs4_schedule_state_renewal(clp);
5397         nfs_put_client(clp);
5398         kfree(calldata);
5399 }
5400
5401 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5402 {
5403         switch(task->tk_status) {
5404         case -NFS4ERR_DELAY:
5405                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5406                 return -EAGAIN;
5407         default:
5408                 nfs4_schedule_lease_recovery(clp);
5409         }
5410         return 0;
5411 }
5412
5413 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5414 {
5415         struct nfs4_sequence_data *calldata = data;
5416         struct nfs_client *clp = calldata->clp;
5417
5418         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5419                 return;
5420
5421         if (task->tk_status < 0) {
5422                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5423                 if (atomic_read(&clp->cl_count) == 1)
5424                         goto out;
5425
5426                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5427                         rpc_restart_call_prepare(task);
5428                         return;
5429                 }
5430         }
5431         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5432 out:
5433         dprintk("<-- %s\n", __func__);
5434 }
5435
5436 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5437 {
5438         struct nfs4_sequence_data *calldata = data;
5439         struct nfs_client *clp = calldata->clp;
5440         struct nfs4_sequence_args *args;
5441         struct nfs4_sequence_res *res;
5442
5443         args = task->tk_msg.rpc_argp;
5444         res = task->tk_msg.rpc_resp;
5445
5446         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5447                 return;
5448         rpc_call_start(task);
5449 }
5450
5451 static const struct rpc_call_ops nfs41_sequence_ops = {
5452         .rpc_call_done = nfs41_sequence_call_done,
5453         .rpc_call_prepare = nfs41_sequence_prepare,
5454         .rpc_release = nfs41_sequence_release,
5455 };
5456
5457 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5458 {
5459         struct nfs4_sequence_data *calldata;
5460         struct rpc_message msg = {
5461                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5462                 .rpc_cred = cred,
5463         };
5464         struct rpc_task_setup task_setup_data = {
5465                 .rpc_client = clp->cl_rpcclient,
5466                 .rpc_message = &msg,
5467                 .callback_ops = &nfs41_sequence_ops,
5468                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5469         };
5470
5471         if (!atomic_inc_not_zero(&clp->cl_count))
5472                 return ERR_PTR(-EIO);
5473         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5474         if (calldata == NULL) {
5475                 nfs_put_client(clp);
5476                 return ERR_PTR(-ENOMEM);
5477         }
5478         msg.rpc_argp = &calldata->args;
5479         msg.rpc_resp = &calldata->res;
5480         calldata->clp = clp;
5481         task_setup_data.callback_data = calldata;
5482
5483         return rpc_run_task(&task_setup_data);
5484 }
5485
5486 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5487 {
5488         struct rpc_task *task;
5489         int ret = 0;
5490
5491         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5492                 return 0;
5493         task = _nfs41_proc_sequence(clp, cred);
5494         if (IS_ERR(task))
5495                 ret = PTR_ERR(task);
5496         else
5497                 rpc_put_task_async(task);
5498         dprintk("<-- %s status=%d\n", __func__, ret);
5499         return ret;
5500 }
5501
5502 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5503 {
5504         struct rpc_task *task;
5505         int ret;
5506
5507         task = _nfs41_proc_sequence(clp, cred);
5508         if (IS_ERR(task)) {
5509                 ret = PTR_ERR(task);
5510                 goto out;
5511         }
5512         ret = rpc_wait_for_completion_task(task);
5513         if (!ret) {
5514                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5515
5516                 if (task->tk_status == 0)
5517                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5518                 ret = task->tk_status;
5519         }
5520         rpc_put_task(task);
5521 out:
5522         dprintk("<-- %s status=%d\n", __func__, ret);
5523         return ret;
5524 }
5525
5526 struct nfs4_reclaim_complete_data {
5527         struct nfs_client *clp;
5528         struct nfs41_reclaim_complete_args arg;
5529         struct nfs41_reclaim_complete_res res;
5530 };
5531
5532 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5533 {
5534         struct nfs4_reclaim_complete_data *calldata = data;
5535
5536         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5537         if (nfs41_setup_sequence(calldata->clp->cl_session,
5538                                 &calldata->arg.seq_args,
5539                                 &calldata->res.seq_res, 0, task))
5540                 return;
5541
5542         rpc_call_start(task);
5543 }
5544
5545 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5546 {
5547         switch(task->tk_status) {
5548         case 0:
5549         case -NFS4ERR_COMPLETE_ALREADY:
5550         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5551                 break;
5552         case -NFS4ERR_DELAY:
5553                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5554                 /* fall through */
5555         case -NFS4ERR_RETRY_UNCACHED_REP:
5556                 return -EAGAIN;
5557         default:
5558                 nfs4_schedule_lease_recovery(clp);
5559         }
5560         return 0;
5561 }
5562
5563 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5564 {
5565         struct nfs4_reclaim_complete_data *calldata = data;
5566         struct nfs_client *clp = calldata->clp;
5567         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5568
5569         dprintk("--> %s\n", __func__);
5570         if (!nfs41_sequence_done(task, res))
5571                 return;
5572
5573         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5574                 rpc_restart_call_prepare(task);
5575                 return;
5576         }
5577         dprintk("<-- %s\n", __func__);
5578 }
5579
5580 static void nfs4_free_reclaim_complete_data(void *data)
5581 {
5582         struct nfs4_reclaim_complete_data *calldata = data;
5583
5584         kfree(calldata);
5585 }
5586
5587 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5588         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5589         .rpc_call_done = nfs4_reclaim_complete_done,
5590         .rpc_release = nfs4_free_reclaim_complete_data,
5591 };
5592
5593 /*
5594  * Issue a global reclaim complete.
5595  */
5596 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5597 {
5598         struct nfs4_reclaim_complete_data *calldata;
5599         struct rpc_task *task;
5600         struct rpc_message msg = {
5601                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5602         };
5603         struct rpc_task_setup task_setup_data = {
5604                 .rpc_client = clp->cl_rpcclient,
5605                 .rpc_message = &msg,
5606                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5607                 .flags = RPC_TASK_ASYNC,
5608         };
5609         int status = -ENOMEM;
5610
5611         dprintk("--> %s\n", __func__);
5612         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5613         if (calldata == NULL)
5614                 goto out;
5615         calldata->clp = clp;
5616         calldata->arg.one_fs = 0;
5617
5618         msg.rpc_argp = &calldata->arg;
5619         msg.rpc_resp = &calldata->res;
5620         task_setup_data.callback_data = calldata;
5621         task = rpc_run_task(&task_setup_data);
5622         if (IS_ERR(task)) {
5623                 status = PTR_ERR(task);
5624                 goto out;
5625         }
5626         status = nfs4_wait_for_completion_rpc_task(task);
5627         if (status == 0)
5628                 status = task->tk_status;
5629         rpc_put_task(task);
5630         return 0;
5631 out:
5632         dprintk("<-- %s status=%d\n", __func__, status);
5633         return status;
5634 }
5635
5636 static void
5637 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5638 {
5639         struct nfs4_layoutget *lgp = calldata;
5640         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5641
5642         dprintk("--> %s\n", __func__);
5643         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5644          * right now covering the LAYOUTGET we are about to send.
5645          * However, that is not so catastrophic, and there seems
5646          * to be no way to prevent it completely.
5647          */
5648         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5649                                 &lgp->res.seq_res, 0, task))
5650                 return;
5651         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5652                                           NFS_I(lgp->args.inode)->layout,
5653                                           lgp->args.ctx->state)) {
5654                 rpc_exit(task, NFS4_OK);
5655                 return;
5656         }
5657         rpc_call_start(task);
5658 }
5659
5660 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5661 {
5662         struct nfs4_layoutget *lgp = calldata;
5663         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5664
5665         dprintk("--> %s\n", __func__);
5666
5667         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5668                 return;
5669
5670         switch (task->tk_status) {
5671         case 0:
5672                 break;
5673         case -NFS4ERR_LAYOUTTRYLATER:
5674         case -NFS4ERR_RECALLCONFLICT:
5675                 task->tk_status = -NFS4ERR_DELAY;
5676                 /* Fall through */
5677         default:
5678                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5679                         rpc_restart_call_prepare(task);
5680                         return;
5681                 }
5682         }
5683         dprintk("<-- %s\n", __func__);
5684 }
5685
5686 static void nfs4_layoutget_release(void *calldata)
5687 {
5688         struct nfs4_layoutget *lgp = calldata;
5689
5690         dprintk("--> %s\n", __func__);
5691         put_nfs_open_context(lgp->args.ctx);
5692         kfree(calldata);
5693         dprintk("<-- %s\n", __func__);
5694 }
5695
5696 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5697         .rpc_call_prepare = nfs4_layoutget_prepare,
5698         .rpc_call_done = nfs4_layoutget_done,
5699         .rpc_release = nfs4_layoutget_release,
5700 };
5701
5702 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5703 {
5704         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5705         struct rpc_task *task;
5706         struct rpc_message msg = {
5707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5708                 .rpc_argp = &lgp->args,
5709                 .rpc_resp = &lgp->res,
5710         };
5711         struct rpc_task_setup task_setup_data = {
5712                 .rpc_client = server->client,
5713                 .rpc_message = &msg,
5714                 .callback_ops = &nfs4_layoutget_call_ops,
5715                 .callback_data = lgp,
5716                 .flags = RPC_TASK_ASYNC,
5717         };
5718         int status = 0;
5719
5720         dprintk("--> %s\n", __func__);
5721
5722         lgp->res.layoutp = &lgp->args.layout;
5723         lgp->res.seq_res.sr_slot = NULL;
5724         task = rpc_run_task(&task_setup_data);
5725         if (IS_ERR(task))
5726                 return PTR_ERR(task);
5727         status = nfs4_wait_for_completion_rpc_task(task);
5728         if (status == 0)
5729                 status = task->tk_status;
5730         if (status == 0)
5731                 status = pnfs_layout_process(lgp);
5732         rpc_put_task(task);
5733         dprintk("<-- %s status=%d\n", __func__, status);
5734         return status;
5735 }
5736
5737 static void
5738 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5739 {
5740         struct nfs4_layoutreturn *lrp = calldata;
5741
5742         dprintk("--> %s\n", __func__);
5743         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5744                                 &lrp->res.seq_res, 0, task))
5745                 return;
5746         rpc_call_start(task);
5747 }
5748
5749 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5750 {
5751         struct nfs4_layoutreturn *lrp = calldata;
5752         struct nfs_server *server;
5753         struct pnfs_layout_hdr *lo = lrp->args.layout;
5754
5755         dprintk("--> %s\n", __func__);
5756
5757         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5758                 return;
5759
5760         server = NFS_SERVER(lrp->args.inode);
5761         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5762                 nfs_restart_rpc(task, lrp->clp);
5763                 return;
5764         }
5765         spin_lock(&lo->plh_inode->i_lock);
5766         if (task->tk_status == 0) {
5767                 if (lrp->res.lrs_present) {
5768                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5769                 } else
5770                         BUG_ON(!list_empty(&lo->plh_segs));
5771         }
5772         lo->plh_block_lgets--;
5773         spin_unlock(&lo->plh_inode->i_lock);
5774         dprintk("<-- %s\n", __func__);
5775 }
5776
5777 static void nfs4_layoutreturn_release(void *calldata)
5778 {
5779         struct nfs4_layoutreturn *lrp = calldata;
5780
5781         dprintk("--> %s\n", __func__);
5782         put_layout_hdr(lrp->args.layout);
5783         kfree(calldata);
5784         dprintk("<-- %s\n", __func__);
5785 }
5786
5787 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5788         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5789         .rpc_call_done = nfs4_layoutreturn_done,
5790         .rpc_release = nfs4_layoutreturn_release,
5791 };
5792
5793 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5794 {
5795         struct rpc_task *task;
5796         struct rpc_message msg = {
5797                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5798                 .rpc_argp = &lrp->args,
5799                 .rpc_resp = &lrp->res,
5800         };
5801         struct rpc_task_setup task_setup_data = {
5802                 .rpc_client = lrp->clp->cl_rpcclient,
5803                 .rpc_message = &msg,
5804                 .callback_ops = &nfs4_layoutreturn_call_ops,
5805                 .callback_data = lrp,
5806         };
5807         int status;
5808
5809         dprintk("--> %s\n", __func__);
5810         task = rpc_run_task(&task_setup_data);
5811         if (IS_ERR(task))
5812                 return PTR_ERR(task);
5813         status = task->tk_status;
5814         dprintk("<-- %s status=%d\n", __func__, status);
5815         rpc_put_task(task);
5816         return status;
5817 }
5818
5819 /*
5820  * Retrieve the list of Data Server devices from the MDS.
5821  */
5822 static int _nfs4_getdevicelist(struct nfs_server *server,
5823                                     const struct nfs_fh *fh,
5824                                     struct pnfs_devicelist *devlist)
5825 {
5826         struct nfs4_getdevicelist_args args = {
5827                 .fh = fh,
5828                 .layoutclass = server->pnfs_curr_ld->id,
5829         };
5830         struct nfs4_getdevicelist_res res = {
5831                 .devlist = devlist,
5832         };
5833         struct rpc_message msg = {
5834                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5835                 .rpc_argp = &args,
5836                 .rpc_resp = &res,
5837         };
5838         int status;
5839
5840         dprintk("--> %s\n", __func__);
5841         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5842                                 &res.seq_res, 0);
5843         dprintk("<-- %s status=%d\n", __func__, status);
5844         return status;
5845 }
5846
5847 int nfs4_proc_getdevicelist(struct nfs_server *server,
5848                             const struct nfs_fh *fh,
5849                             struct pnfs_devicelist *devlist)
5850 {
5851         struct nfs4_exception exception = { };
5852         int err;
5853
5854         do {
5855                 err = nfs4_handle_exception(server,
5856                                 _nfs4_getdevicelist(server, fh, devlist),
5857                                 &exception);
5858         } while (exception.retry);
5859
5860         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5861                 err, devlist->num_devs);
5862
5863         return err;
5864 }
5865 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5866
5867 static int
5868 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5869 {
5870         struct nfs4_getdeviceinfo_args args = {
5871                 .pdev = pdev,
5872         };
5873         struct nfs4_getdeviceinfo_res res = {
5874                 .pdev = pdev,
5875         };
5876         struct rpc_message msg = {
5877                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5878                 .rpc_argp = &args,
5879                 .rpc_resp = &res,
5880         };
5881         int status;
5882
5883         dprintk("--> %s\n", __func__);
5884         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5885         dprintk("<-- %s status=%d\n", __func__, status);
5886
5887         return status;
5888 }
5889
5890 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5891 {
5892         struct nfs4_exception exception = { };
5893         int err;
5894
5895         do {
5896                 err = nfs4_handle_exception(server,
5897                                         _nfs4_proc_getdeviceinfo(server, pdev),
5898                                         &exception);
5899         } while (exception.retry);
5900         return err;
5901 }
5902 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5903
5904 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5905 {
5906         struct nfs4_layoutcommit_data *data = calldata;
5907         struct nfs_server *server = NFS_SERVER(data->args.inode);
5908
5909         if (nfs4_setup_sequence(server, &data->args.seq_args,
5910                                 &data->res.seq_res, 1, task))
5911                 return;
5912         rpc_call_start(task);
5913 }
5914
5915 static void
5916 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5917 {
5918         struct nfs4_layoutcommit_data *data = calldata;
5919         struct nfs_server *server = NFS_SERVER(data->args.inode);
5920
5921         if (!nfs4_sequence_done(task, &data->res.seq_res))
5922                 return;
5923
5924         switch (task->tk_status) { /* Just ignore these failures */
5925         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5926         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5927         case NFS4ERR_BADLAYOUT:     /* no layout */
5928         case NFS4ERR_GRACE:         /* loca_recalim always false */
5929                 task->tk_status = 0;
5930         }
5931
5932         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5933                 nfs_restart_rpc(task, server->nfs_client);
5934                 return;
5935         }
5936
5937         if (task->tk_status == 0)
5938                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5939                                                    data->res.fattr);
5940 }
5941
5942 static void nfs4_layoutcommit_release(void *calldata)
5943 {
5944         struct nfs4_layoutcommit_data *data = calldata;
5945         struct pnfs_layout_segment *lseg, *tmp;
5946
5947         pnfs_cleanup_layoutcommit(data);
5948         /* Matched by references in pnfs_set_layoutcommit */
5949         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5950                 list_del_init(&lseg->pls_lc_list);
5951                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
5952                                        &lseg->pls_flags))
5953                         put_lseg(lseg);
5954         }
5955         put_rpccred(data->cred);
5956         kfree(data);
5957 }
5958
5959 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5960         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5961         .rpc_call_done = nfs4_layoutcommit_done,
5962         .rpc_release = nfs4_layoutcommit_release,
5963 };
5964
5965 int
5966 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5967 {
5968         struct rpc_message msg = {
5969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5970                 .rpc_argp = &data->args,
5971                 .rpc_resp = &data->res,
5972                 .rpc_cred = data->cred,
5973         };
5974         struct rpc_task_setup task_setup_data = {
5975                 .task = &data->task,
5976                 .rpc_client = NFS_CLIENT(data->args.inode),
5977                 .rpc_message = &msg,
5978                 .callback_ops = &nfs4_layoutcommit_ops,
5979                 .callback_data = data,
5980                 .flags = RPC_TASK_ASYNC,
5981         };
5982         struct rpc_task *task;
5983         int status = 0;
5984
5985         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5986                 "lbw: %llu inode %lu\n",
5987                 data->task.tk_pid, sync,
5988                 data->args.lastbytewritten,
5989                 data->args.inode->i_ino);
5990
5991         task = rpc_run_task(&task_setup_data);
5992         if (IS_ERR(task))
5993                 return PTR_ERR(task);
5994         if (sync == false)
5995                 goto out;
5996         status = nfs4_wait_for_completion_rpc_task(task);
5997         if (status != 0)
5998                 goto out;
5999         status = task->tk_status;
6000 out:
6001         dprintk("%s: status %d\n", __func__, status);
6002         rpc_put_task(task);
6003         return status;
6004 }
6005
6006 static int
6007 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6008                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6009 {
6010         struct nfs41_secinfo_no_name_args args = {
6011                 .style = SECINFO_STYLE_CURRENT_FH,
6012         };
6013         struct nfs4_secinfo_res res = {
6014                 .flavors = flavors,
6015         };
6016         struct rpc_message msg = {
6017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6018                 .rpc_argp = &args,
6019                 .rpc_resp = &res,
6020         };
6021         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6022 }
6023
6024 static int
6025 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6026                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6027 {
6028         struct nfs4_exception exception = { };
6029         int err;
6030         do {
6031                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6032                 switch (err) {
6033                 case 0:
6034                 case -NFS4ERR_WRONGSEC:
6035                 case -NFS4ERR_NOTSUPP:
6036                         break;
6037                 default:
6038                         err = nfs4_handle_exception(server, err, &exception);
6039                 }
6040         } while (exception.retry);
6041         return err;
6042 }
6043
6044 static int
6045 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6046                     struct nfs_fsinfo *info)
6047 {
6048         int err;
6049         struct page *page;
6050         rpc_authflavor_t flavor;
6051         struct nfs4_secinfo_flavors *flavors;
6052
6053         page = alloc_page(GFP_KERNEL);
6054         if (!page) {
6055                 err = -ENOMEM;
6056                 goto out;
6057         }
6058
6059         flavors = page_address(page);
6060         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6061
6062         /*
6063          * Fall back on "guess and check" method if
6064          * the server doesn't support SECINFO_NO_NAME
6065          */
6066         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6067                 err = nfs4_find_root_sec(server, fhandle, info);
6068                 goto out_freepage;
6069         }
6070         if (err)
6071                 goto out_freepage;
6072
6073         flavor = nfs_find_best_sec(flavors);
6074         if (err == 0)
6075                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6076
6077 out_freepage:
6078         put_page(page);
6079         if (err == -EACCES)
6080                 return -EPERM;
6081 out:
6082         return err;
6083 }
6084 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6085 {
6086         int status;
6087         struct nfs41_test_stateid_args args = {
6088                 .stateid = &state->stateid,
6089         };
6090         struct nfs41_test_stateid_res res;
6091         struct rpc_message msg = {
6092                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6093                 .rpc_argp = &args,
6094                 .rpc_resp = &res,
6095         };
6096         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6097         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6098         return status;
6099 }
6100
6101 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6102 {
6103         struct nfs4_exception exception = { };
6104         int err;
6105         do {
6106                 err = nfs4_handle_exception(server,
6107                                 _nfs41_test_stateid(server, state),
6108                                 &exception);
6109         } while (exception.retry);
6110         return err;
6111 }
6112
6113 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6114 {
6115         int status;
6116         struct nfs41_free_stateid_args args = {
6117                 .stateid = &state->stateid,
6118         };
6119         struct nfs41_free_stateid_res res;
6120         struct rpc_message msg = {
6121                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6122                 .rpc_argp = &args,
6123                 .rpc_resp = &res,
6124         };
6125
6126         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6127         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6128         return status;
6129 }
6130
6131 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6132 {
6133         struct nfs4_exception exception = { };
6134         int err;
6135         do {
6136                 err = nfs4_handle_exception(server,
6137                                 _nfs4_free_stateid(server, state),
6138                                 &exception);
6139         } while (exception.retry);
6140         return err;
6141 }
6142 #endif /* CONFIG_NFS_V4_1 */
6143
6144 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6145         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6146         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6147         .recover_open   = nfs4_open_reclaim,
6148         .recover_lock   = nfs4_lock_reclaim,
6149         .establish_clid = nfs4_init_clientid,
6150         .get_clid_cred  = nfs4_get_setclientid_cred,
6151 };
6152
6153 #if defined(CONFIG_NFS_V4_1)
6154 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6155         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6156         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6157         .recover_open   = nfs4_open_reclaim,
6158         .recover_lock   = nfs4_lock_reclaim,
6159         .establish_clid = nfs41_init_clientid,
6160         .get_clid_cred  = nfs4_get_exchange_id_cred,
6161         .reclaim_complete = nfs41_proc_reclaim_complete,
6162 };
6163 #endif /* CONFIG_NFS_V4_1 */
6164
6165 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6166         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6167         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6168         .recover_open   = nfs4_open_expired,
6169         .recover_lock   = nfs4_lock_expired,
6170         .establish_clid = nfs4_init_clientid,
6171         .get_clid_cred  = nfs4_get_setclientid_cred,
6172 };
6173
6174 #if defined(CONFIG_NFS_V4_1)
6175 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6176         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6177         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6178         .recover_open   = nfs41_open_expired,
6179         .recover_lock   = nfs41_lock_expired,
6180         .establish_clid = nfs41_init_clientid,
6181         .get_clid_cred  = nfs4_get_exchange_id_cred,
6182 };
6183 #endif /* CONFIG_NFS_V4_1 */
6184
6185 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6186         .sched_state_renewal = nfs4_proc_async_renew,
6187         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6188         .renew_lease = nfs4_proc_renew,
6189 };
6190
6191 #if defined(CONFIG_NFS_V4_1)
6192 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6193         .sched_state_renewal = nfs41_proc_async_sequence,
6194         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6195         .renew_lease = nfs4_proc_sequence,
6196 };
6197 #endif
6198
6199 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6200         .minor_version = 0,
6201         .call_sync = _nfs4_call_sync,
6202         .validate_stateid = nfs4_validate_delegation_stateid,
6203         .find_root_sec = nfs4_find_root_sec,
6204         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6205         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6206         .state_renewal_ops = &nfs40_state_renewal_ops,
6207 };
6208
6209 #if defined(CONFIG_NFS_V4_1)
6210 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6211         .minor_version = 1,
6212         .call_sync = _nfs4_call_sync_session,
6213         .validate_stateid = nfs41_validate_delegation_stateid,
6214         .find_root_sec = nfs41_find_root_sec,
6215         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6216         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6217         .state_renewal_ops = &nfs41_state_renewal_ops,
6218 };
6219 #endif
6220
6221 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6222         [0] = &nfs_v4_0_minor_ops,
6223 #if defined(CONFIG_NFS_V4_1)
6224         [1] = &nfs_v4_1_minor_ops,
6225 #endif
6226 };
6227
6228 static const struct inode_operations nfs4_file_inode_operations = {
6229         .permission     = nfs_permission,
6230         .getattr        = nfs_getattr,
6231         .setattr        = nfs_setattr,
6232         .getxattr       = generic_getxattr,
6233         .setxattr       = generic_setxattr,
6234         .listxattr      = generic_listxattr,
6235         .removexattr    = generic_removexattr,
6236 };
6237
6238 const struct nfs_rpc_ops nfs_v4_clientops = {
6239         .version        = 4,                    /* protocol version */
6240         .dentry_ops     = &nfs4_dentry_operations,
6241         .dir_inode_ops  = &nfs4_dir_inode_operations,
6242         .file_inode_ops = &nfs4_file_inode_operations,
6243         .getroot        = nfs4_proc_get_root,
6244         .getattr        = nfs4_proc_getattr,
6245         .setattr        = nfs4_proc_setattr,
6246         .lookup         = nfs4_proc_lookup,
6247         .access         = nfs4_proc_access,
6248         .readlink       = nfs4_proc_readlink,
6249         .create         = nfs4_proc_create,
6250         .remove         = nfs4_proc_remove,
6251         .unlink_setup   = nfs4_proc_unlink_setup,
6252         .unlink_done    = nfs4_proc_unlink_done,
6253         .rename         = nfs4_proc_rename,
6254         .rename_setup   = nfs4_proc_rename_setup,
6255         .rename_done    = nfs4_proc_rename_done,
6256         .link           = nfs4_proc_link,
6257         .symlink        = nfs4_proc_symlink,
6258         .mkdir          = nfs4_proc_mkdir,
6259         .rmdir          = nfs4_proc_remove,
6260         .readdir        = nfs4_proc_readdir,
6261         .mknod          = nfs4_proc_mknod,
6262         .statfs         = nfs4_proc_statfs,
6263         .fsinfo         = nfs4_proc_fsinfo,
6264         .pathconf       = nfs4_proc_pathconf,
6265         .set_capabilities = nfs4_server_capabilities,
6266         .decode_dirent  = nfs4_decode_dirent,
6267         .read_setup     = nfs4_proc_read_setup,
6268         .read_done      = nfs4_read_done,
6269         .write_setup    = nfs4_proc_write_setup,
6270         .write_done     = nfs4_write_done,
6271         .commit_setup   = nfs4_proc_commit_setup,
6272         .commit_done    = nfs4_commit_done,
6273         .lock           = nfs4_proc_lock,
6274         .clear_acl_cache = nfs4_zap_acl_attr,
6275         .close_context  = nfs4_close_context,
6276         .open_context   = nfs4_atomic_open,
6277         .init_client    = nfs4_init_client,
6278         .secinfo        = nfs4_proc_secinfo,
6279 };
6280
6281 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6282         .prefix = XATTR_NAME_NFSV4_ACL,
6283         .list   = nfs4_xattr_list_nfs4_acl,
6284         .get    = nfs4_xattr_get_nfs4_acl,
6285         .set    = nfs4_xattr_set_nfs4_acl,
6286 };
6287
6288 const struct xattr_handler *nfs4_xattr_handlers[] = {
6289         &nfs4_xattr_nfs4_acl_handler,
6290         NULL
6291 };
6292
6293 /*
6294  * Local variables:
6295  *  c-basic-offset: 8
6296  * End:
6297  */