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 (!data->rpc_done)
1597                 return status;
1598         if (status != 0) {
1599                 if (status == -NFS4ERR_BADNAME &&
1600                                 !(o_arg->open_flags & O_CREAT))
1601                         return -ENOENT;
1602                 return status;
1603         }
1604
1605         if (o_arg->open_flags & O_CREAT) {
1606                 update_changeattr(dir, &o_res->cinfo);
1607                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1608         } else
1609                 nfs_refresh_inode(dir, o_res->dir_attr);
1610         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1611                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1612         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1613                 status = _nfs4_proc_open_confirm(data);
1614                 if (status != 0)
1615                         return status;
1616         }
1617         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1618                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1619         return 0;
1620 }
1621
1622 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1623 {
1624         unsigned int loop;
1625         int ret;
1626
1627         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1628                 ret = nfs4_wait_clnt_recover(clp);
1629                 if (ret != 0)
1630                         break;
1631                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1632                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1633                         break;
1634                 nfs4_schedule_state_manager(clp);
1635                 ret = -EIO;
1636         }
1637         return ret;
1638 }
1639
1640 static int nfs4_recover_expired_lease(struct nfs_server *server)
1641 {
1642         return nfs4_client_recover_expired_lease(server->nfs_client);
1643 }
1644
1645 /*
1646  * OPEN_EXPIRED:
1647  *      reclaim state on the server after a network partition.
1648  *      Assumes caller holds the appropriate lock
1649  */
1650 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1651 {
1652         struct nfs4_opendata *opendata;
1653         int ret;
1654
1655         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1656         if (IS_ERR(opendata))
1657                 return PTR_ERR(opendata);
1658         ret = nfs4_open_recover(opendata, state);
1659         if (ret == -ESTALE)
1660                 d_drop(ctx->dentry);
1661         nfs4_opendata_put(opendata);
1662         return ret;
1663 }
1664
1665 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1666 {
1667         struct nfs_server *server = NFS_SERVER(state->inode);
1668         struct nfs4_exception exception = { };
1669         int err;
1670
1671         do {
1672                 err = _nfs4_open_expired(ctx, state);
1673                 switch (err) {
1674                 default:
1675                         goto out;
1676                 case -NFS4ERR_GRACE:
1677                 case -NFS4ERR_DELAY:
1678                         nfs4_handle_exception(server, err, &exception);
1679                         err = 0;
1680                 }
1681         } while (exception.retry);
1682 out:
1683         return err;
1684 }
1685
1686 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1687 {
1688         struct nfs_open_context *ctx;
1689         int ret;
1690
1691         ctx = nfs4_state_find_open_context(state);
1692         if (IS_ERR(ctx))
1693                 return PTR_ERR(ctx);
1694         ret = nfs4_do_open_expired(ctx, state);
1695         put_nfs_open_context(ctx);
1696         return ret;
1697 }
1698
1699 #if defined(CONFIG_NFS_V4_1)
1700 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1701 {
1702         int status;
1703         struct nfs_server *server = NFS_SERVER(state->inode);
1704
1705         status = nfs41_test_stateid(server, state);
1706         if (status == NFS_OK)
1707                 return 0;
1708         nfs41_free_stateid(server, state);
1709         return nfs4_open_expired(sp, state);
1710 }
1711 #endif
1712
1713 /*
1714  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1715  * fields corresponding to attributes that were used to store the verifier.
1716  * Make sure we clobber those fields in the later setattr call
1717  */
1718 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1719 {
1720         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1721             !(sattr->ia_valid & ATTR_ATIME_SET))
1722                 sattr->ia_valid |= ATTR_ATIME;
1723
1724         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1725             !(sattr->ia_valid & ATTR_MTIME_SET))
1726                 sattr->ia_valid |= ATTR_MTIME;
1727 }
1728
1729 /*
1730  * Returns a referenced nfs4_state
1731  */
1732 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)
1733 {
1734         struct nfs4_state_owner  *sp;
1735         struct nfs4_state     *state = NULL;
1736         struct nfs_server       *server = NFS_SERVER(dir);
1737         struct nfs4_opendata *opendata;
1738         int status;
1739
1740         /* Protect against reboot recovery conflicts */
1741         status = -ENOMEM;
1742         if (!(sp = nfs4_get_state_owner(server, cred))) {
1743                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1744                 goto out_err;
1745         }
1746         status = nfs4_recover_expired_lease(server);
1747         if (status != 0)
1748                 goto err_put_state_owner;
1749         if (dentry->d_inode != NULL)
1750                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1751         status = -ENOMEM;
1752         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1753         if (opendata == NULL)
1754                 goto err_put_state_owner;
1755
1756         if (dentry->d_inode != NULL)
1757                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1758
1759         status = _nfs4_proc_open(opendata);
1760         if (status != 0)
1761                 goto err_opendata_put;
1762
1763         state = nfs4_opendata_to_nfs4_state(opendata);
1764         status = PTR_ERR(state);
1765         if (IS_ERR(state))
1766                 goto err_opendata_put;
1767         if (server->caps & NFS_CAP_POSIX_LOCK)
1768                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1769
1770         if (opendata->o_arg.open_flags & O_EXCL) {
1771                 nfs4_exclusive_attrset(opendata, sattr);
1772
1773                 nfs_fattr_init(opendata->o_res.f_attr);
1774                 status = nfs4_do_setattr(state->inode, cred,
1775                                 opendata->o_res.f_attr, sattr,
1776                                 state);
1777                 if (status == 0)
1778                         nfs_setattr_update_inode(state->inode, sattr);
1779                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1780         }
1781         nfs4_opendata_put(opendata);
1782         nfs4_put_state_owner(sp);
1783         *res = state;
1784         return 0;
1785 err_opendata_put:
1786         nfs4_opendata_put(opendata);
1787 err_put_state_owner:
1788         nfs4_put_state_owner(sp);
1789 out_err:
1790         *res = NULL;
1791         return status;
1792 }
1793
1794
1795 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)
1796 {
1797         struct nfs4_exception exception = { };
1798         struct nfs4_state *res;
1799         int status;
1800
1801         do {
1802                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1803                 if (status == 0)
1804                         break;
1805                 /* NOTE: BAD_SEQID means the server and client disagree about the
1806                  * book-keeping w.r.t. state-changing operations
1807                  * (OPEN/CLOSE/LOCK/LOCKU...)
1808                  * It is actually a sign of a bug on the client or on the server.
1809                  *
1810                  * If we receive a BAD_SEQID error in the particular case of
1811                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1812                  * have unhashed the old state_owner for us, and that we can
1813                  * therefore safely retry using a new one. We should still warn
1814                  * the user though...
1815                  */
1816                 if (status == -NFS4ERR_BAD_SEQID) {
1817                         printk(KERN_WARNING "NFS: v4 server %s "
1818                                         " returned a bad sequence-id error!\n",
1819                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1820                         exception.retry = 1;
1821                         continue;
1822                 }
1823                 /*
1824                  * BAD_STATEID on OPEN means that the server cancelled our
1825                  * state before it received the OPEN_CONFIRM.
1826                  * Recover by retrying the request as per the discussion
1827                  * on Page 181 of RFC3530.
1828                  */
1829                 if (status == -NFS4ERR_BAD_STATEID) {
1830                         exception.retry = 1;
1831                         continue;
1832                 }
1833                 if (status == -EAGAIN) {
1834                         /* We must have found a delegation */
1835                         exception.retry = 1;
1836                         continue;
1837                 }
1838                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1839                                         status, &exception));
1840         } while (exception.retry);
1841         return res;
1842 }
1843
1844 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1845                             struct nfs_fattr *fattr, struct iattr *sattr,
1846                             struct nfs4_state *state)
1847 {
1848         struct nfs_server *server = NFS_SERVER(inode);
1849         struct nfs_setattrargs  arg = {
1850                 .fh             = NFS_FH(inode),
1851                 .iap            = sattr,
1852                 .server         = server,
1853                 .bitmask = server->attr_bitmask,
1854         };
1855         struct nfs_setattrres  res = {
1856                 .fattr          = fattr,
1857                 .server         = server,
1858         };
1859         struct rpc_message msg = {
1860                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1861                 .rpc_argp       = &arg,
1862                 .rpc_resp       = &res,
1863                 .rpc_cred       = cred,
1864         };
1865         unsigned long timestamp = jiffies;
1866         int status;
1867
1868         nfs_fattr_init(fattr);
1869
1870         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1871                 /* Use that stateid */
1872         } else if (state != NULL) {
1873                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1874         } else
1875                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1876
1877         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1878         if (status == 0 && state != NULL)
1879                 renew_lease(server, timestamp);
1880         return status;
1881 }
1882
1883 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1884                            struct nfs_fattr *fattr, struct iattr *sattr,
1885                            struct nfs4_state *state)
1886 {
1887         struct nfs_server *server = NFS_SERVER(inode);
1888         struct nfs4_exception exception = { };
1889         int err;
1890         do {
1891                 err = nfs4_handle_exception(server,
1892                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1893                                 &exception);
1894         } while (exception.retry);
1895         return err;
1896 }
1897
1898 struct nfs4_closedata {
1899         struct inode *inode;
1900         struct nfs4_state *state;
1901         struct nfs_closeargs arg;
1902         struct nfs_closeres res;
1903         struct nfs_fattr fattr;
1904         unsigned long timestamp;
1905         bool roc;
1906         u32 roc_barrier;
1907 };
1908
1909 static void nfs4_free_closedata(void *data)
1910 {
1911         struct nfs4_closedata *calldata = data;
1912         struct nfs4_state_owner *sp = calldata->state->owner;
1913         struct super_block *sb = calldata->state->inode->i_sb;
1914
1915         if (calldata->roc)
1916                 pnfs_roc_release(calldata->state->inode);
1917         nfs4_put_open_state(calldata->state);
1918         nfs_free_seqid(calldata->arg.seqid);
1919         nfs4_put_state_owner(sp);
1920         nfs_sb_deactive(sb);
1921         kfree(calldata);
1922 }
1923
1924 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1925                 fmode_t fmode)
1926 {
1927         spin_lock(&state->owner->so_lock);
1928         if (!(fmode & FMODE_READ))
1929                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1930         if (!(fmode & FMODE_WRITE))
1931                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1932         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1933         spin_unlock(&state->owner->so_lock);
1934 }
1935
1936 static void nfs4_close_done(struct rpc_task *task, void *data)
1937 {
1938         struct nfs4_closedata *calldata = data;
1939         struct nfs4_state *state = calldata->state;
1940         struct nfs_server *server = NFS_SERVER(calldata->inode);
1941
1942         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1943                 return;
1944         /* hmm. we are done with the inode, and in the process of freeing
1945          * the state_owner. we keep this around to process errors
1946          */
1947         switch (task->tk_status) {
1948                 case 0:
1949                         if (calldata->roc)
1950                                 pnfs_roc_set_barrier(state->inode,
1951                                                      calldata->roc_barrier);
1952                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1953                         renew_lease(server, calldata->timestamp);
1954                         nfs4_close_clear_stateid_flags(state,
1955                                         calldata->arg.fmode);
1956                         break;
1957                 case -NFS4ERR_STALE_STATEID:
1958                 case -NFS4ERR_OLD_STATEID:
1959                 case -NFS4ERR_BAD_STATEID:
1960                 case -NFS4ERR_EXPIRED:
1961                         if (calldata->arg.fmode == 0)
1962                                 break;
1963                 default:
1964                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1965                                 rpc_restart_call_prepare(task);
1966         }
1967         nfs_release_seqid(calldata->arg.seqid);
1968         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1969 }
1970
1971 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1972 {
1973         struct nfs4_closedata *calldata = data;
1974         struct nfs4_state *state = calldata->state;
1975         int call_close = 0;
1976
1977         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1978                 return;
1979
1980         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1981         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1982         spin_lock(&state->owner->so_lock);
1983         /* Calculate the change in open mode */
1984         if (state->n_rdwr == 0) {
1985                 if (state->n_rdonly == 0) {
1986                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1987                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1988                         calldata->arg.fmode &= ~FMODE_READ;
1989                 }
1990                 if (state->n_wronly == 0) {
1991                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1992                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1993                         calldata->arg.fmode &= ~FMODE_WRITE;
1994                 }
1995         }
1996         spin_unlock(&state->owner->so_lock);
1997
1998         if (!call_close) {
1999                 /* Note: exit _without_ calling nfs4_close_done */
2000                 task->tk_action = NULL;
2001                 return;
2002         }
2003
2004         if (calldata->arg.fmode == 0) {
2005                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2006                 if (calldata->roc &&
2007                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2008                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2009                                      task, NULL);
2010                         return;
2011                 }
2012         }
2013
2014         nfs_fattr_init(calldata->res.fattr);
2015         calldata->timestamp = jiffies;
2016         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2017                                 &calldata->arg.seq_args, &calldata->res.seq_res,
2018                                 1, task))
2019                 return;
2020         rpc_call_start(task);
2021 }
2022
2023 static const struct rpc_call_ops nfs4_close_ops = {
2024         .rpc_call_prepare = nfs4_close_prepare,
2025         .rpc_call_done = nfs4_close_done,
2026         .rpc_release = nfs4_free_closedata,
2027 };
2028
2029 /*
2030  * It is possible for data to be read/written from a mem-mapped file
2031  * after the sys_close call (which hits the vfs layer as a flush).
2032  * This means that we can't safely call nfsv4 close on a file until
2033  * the inode is cleared. This in turn means that we are not good
2034  * NFSv4 citizens - we do not indicate to the server to update the file's
2035  * share state even when we are done with one of the three share
2036  * stateid's in the inode.
2037  *
2038  * NOTE: Caller must be holding the sp->so_owner semaphore!
2039  */
2040 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2041 {
2042         struct nfs_server *server = NFS_SERVER(state->inode);
2043         struct nfs4_closedata *calldata;
2044         struct nfs4_state_owner *sp = state->owner;
2045         struct rpc_task *task;
2046         struct rpc_message msg = {
2047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2048                 .rpc_cred = state->owner->so_cred,
2049         };
2050         struct rpc_task_setup task_setup_data = {
2051                 .rpc_client = server->client,
2052                 .rpc_message = &msg,
2053                 .callback_ops = &nfs4_close_ops,
2054                 .workqueue = nfsiod_workqueue,
2055                 .flags = RPC_TASK_ASYNC,
2056         };
2057         int status = -ENOMEM;
2058
2059         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2060         if (calldata == NULL)
2061                 goto out;
2062         calldata->inode = state->inode;
2063         calldata->state = state;
2064         calldata->arg.fh = NFS_FH(state->inode);
2065         calldata->arg.stateid = &state->open_stateid;
2066         /* Serialization for the sequence id */
2067         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2068         if (calldata->arg.seqid == NULL)
2069                 goto out_free_calldata;
2070         calldata->arg.fmode = 0;
2071         calldata->arg.bitmask = server->cache_consistency_bitmask;
2072         calldata->res.fattr = &calldata->fattr;
2073         calldata->res.seqid = calldata->arg.seqid;
2074         calldata->res.server = server;
2075         calldata->roc = roc;
2076         nfs_sb_active(calldata->inode->i_sb);
2077
2078         msg.rpc_argp = &calldata->arg;
2079         msg.rpc_resp = &calldata->res;
2080         task_setup_data.callback_data = calldata;
2081         task = rpc_run_task(&task_setup_data);
2082         if (IS_ERR(task))
2083                 return PTR_ERR(task);
2084         status = 0;
2085         if (wait)
2086                 status = rpc_wait_for_completion_task(task);
2087         rpc_put_task(task);
2088         return status;
2089 out_free_calldata:
2090         kfree(calldata);
2091 out:
2092         if (roc)
2093                 pnfs_roc_release(state->inode);
2094         nfs4_put_open_state(state);
2095         nfs4_put_state_owner(sp);
2096         return status;
2097 }
2098
2099 static struct inode *
2100 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2101 {
2102         struct nfs4_state *state;
2103
2104         /* Protect against concurrent sillydeletes */
2105         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2106         if (IS_ERR(state))
2107                 return ERR_CAST(state);
2108         ctx->state = state;
2109         return igrab(state->inode);
2110 }
2111
2112 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2113 {
2114         if (ctx->state == NULL)
2115                 return;
2116         if (is_sync)
2117                 nfs4_close_sync(ctx->state, ctx->mode);
2118         else
2119                 nfs4_close_state(ctx->state, ctx->mode);
2120 }
2121
2122 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2123 {
2124         struct nfs4_server_caps_arg args = {
2125                 .fhandle = fhandle,
2126         };
2127         struct nfs4_server_caps_res res = {};
2128         struct rpc_message msg = {
2129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2130                 .rpc_argp = &args,
2131                 .rpc_resp = &res,
2132         };
2133         int status;
2134
2135         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2136         if (status == 0) {
2137                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2138                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2139                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2140                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2141                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2142                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2143                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2144                         server->caps |= NFS_CAP_ACLS;
2145                 if (res.has_links != 0)
2146                         server->caps |= NFS_CAP_HARDLINKS;
2147                 if (res.has_symlinks != 0)
2148                         server->caps |= NFS_CAP_SYMLINKS;
2149                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2150                         server->caps |= NFS_CAP_FILEID;
2151                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2152                         server->caps |= NFS_CAP_MODE;
2153                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2154                         server->caps |= NFS_CAP_NLINK;
2155                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2156                         server->caps |= NFS_CAP_OWNER;
2157                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2158                         server->caps |= NFS_CAP_OWNER_GROUP;
2159                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2160                         server->caps |= NFS_CAP_ATIME;
2161                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2162                         server->caps |= NFS_CAP_CTIME;
2163                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2164                         server->caps |= NFS_CAP_MTIME;
2165
2166                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2167                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2168                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2169                 server->acl_bitmask = res.acl_bitmask;
2170         }
2171
2172         return status;
2173 }
2174
2175 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2176 {
2177         struct nfs4_exception exception = { };
2178         int err;
2179         do {
2180                 err = nfs4_handle_exception(server,
2181                                 _nfs4_server_capabilities(server, fhandle),
2182                                 &exception);
2183         } while (exception.retry);
2184         return err;
2185 }
2186
2187 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2188                 struct nfs_fsinfo *info)
2189 {
2190         struct nfs4_lookup_root_arg args = {
2191                 .bitmask = nfs4_fattr_bitmap,
2192         };
2193         struct nfs4_lookup_res res = {
2194                 .server = server,
2195                 .fattr = info->fattr,
2196                 .fh = fhandle,
2197         };
2198         struct rpc_message msg = {
2199                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2200                 .rpc_argp = &args,
2201                 .rpc_resp = &res,
2202         };
2203
2204         nfs_fattr_init(info->fattr);
2205         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2206 }
2207
2208 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2209                 struct nfs_fsinfo *info)
2210 {
2211         struct nfs4_exception exception = { };
2212         int err;
2213         do {
2214                 err = _nfs4_lookup_root(server, fhandle, info);
2215                 switch (err) {
2216                 case 0:
2217                 case -NFS4ERR_WRONGSEC:
2218                         break;
2219                 default:
2220                         err = nfs4_handle_exception(server, err, &exception);
2221                 }
2222         } while (exception.retry);
2223         return err;
2224 }
2225
2226 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2227                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2228 {
2229         struct rpc_auth *auth;
2230         int ret;
2231
2232         auth = rpcauth_create(flavor, server->client);
2233         if (!auth) {
2234                 ret = -EIO;
2235                 goto out;
2236         }
2237         ret = nfs4_lookup_root(server, fhandle, info);
2238 out:
2239         return ret;
2240 }
2241
2242 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2243                               struct nfs_fsinfo *info)
2244 {
2245         int i, len, status = 0;
2246         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2247
2248         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2249         flav_array[len] = RPC_AUTH_NULL;
2250         len += 1;
2251
2252         for (i = 0; i < len; i++) {
2253                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2254                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2255                         continue;
2256                 break;
2257         }
2258         /*
2259          * -EACCESS could mean that the user doesn't have correct permissions
2260          * to access the mount.  It could also mean that we tried to mount
2261          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2262          * existing mount programs don't handle -EACCES very well so it should
2263          * be mapped to -EPERM instead.
2264          */
2265         if (status == -EACCES)
2266                 status = -EPERM;
2267         return status;
2268 }
2269
2270 /*
2271  * get the file handle for the "/" directory on the server
2272  */
2273 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2274                               struct nfs_fsinfo *info)
2275 {
2276         int minor_version = server->nfs_client->cl_minorversion;
2277         int status = nfs4_lookup_root(server, fhandle, info);
2278         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2279                 /*
2280                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2281                  * by nfs4_map_errors() as this function exits.
2282                  */
2283                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2284         if (status == 0)
2285                 status = nfs4_server_capabilities(server, fhandle);
2286         if (status == 0)
2287                 status = nfs4_do_fsinfo(server, fhandle, info);
2288         return nfs4_map_errors(status);
2289 }
2290
2291 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
2292 /*
2293  * Get locations and (maybe) other attributes of a referral.
2294  * Note that we'll actually follow the referral later when
2295  * we detect fsid mismatch in inode revalidation
2296  */
2297 static int nfs4_get_referral(struct inode *dir, const struct qstr *name,
2298                              struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2299 {
2300         int status = -ENOMEM;
2301         struct page *page = NULL;
2302         struct nfs4_fs_locations *locations = NULL;
2303
2304         page = alloc_page(GFP_KERNEL);
2305         if (page == NULL)
2306                 goto out;
2307         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2308         if (locations == NULL)
2309                 goto out;
2310
2311         status = nfs4_proc_fs_locations(dir, name, locations, page);
2312         if (status != 0)
2313                 goto out;
2314         /* Make sure server returned a different fsid for the referral */
2315         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2316                 dprintk("%s: server did not return a different fsid for"
2317                         " a referral at %s\n", __func__, name->name);
2318                 status = -EIO;
2319                 goto out;
2320         }
2321         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2322         nfs_fixup_referral_attributes(&locations->fattr);
2323
2324         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2325         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2326         memset(fhandle, 0, sizeof(struct nfs_fh));
2327 out:
2328         if (page)
2329                 __free_page(page);
2330         kfree(locations);
2331         return status;
2332 }
2333
2334 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2335 {
2336         struct nfs4_getattr_arg args = {
2337                 .fh = fhandle,
2338                 .bitmask = server->attr_bitmask,
2339         };
2340         struct nfs4_getattr_res res = {
2341                 .fattr = fattr,
2342                 .server = server,
2343         };
2344         struct rpc_message msg = {
2345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2346                 .rpc_argp = &args,
2347                 .rpc_resp = &res,
2348         };
2349
2350         nfs_fattr_init(fattr);
2351         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2352 }
2353
2354 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2355 {
2356         struct nfs4_exception exception = { };
2357         int err;
2358         do {
2359                 err = nfs4_handle_exception(server,
2360                                 _nfs4_proc_getattr(server, fhandle, fattr),
2361                                 &exception);
2362         } while (exception.retry);
2363         return err;
2364 }
2365
2366 /*
2367  * The file is not closed if it is opened due to the a request to change
2368  * the size of the file. The open call will not be needed once the
2369  * VFS layer lookup-intents are implemented.
2370  *
2371  * Close is called when the inode is destroyed.
2372  * If we haven't opened the file for O_WRONLY, we
2373  * need to in the size_change case to obtain a stateid.
2374  *
2375  * Got race?
2376  * Because OPEN is always done by name in nfsv4, it is
2377  * possible that we opened a different file by the same
2378  * name.  We can recognize this race condition, but we
2379  * can't do anything about it besides returning an error.
2380  *
2381  * This will be fixed with VFS changes (lookup-intent).
2382  */
2383 static int
2384 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2385                   struct iattr *sattr)
2386 {
2387         struct inode *inode = dentry->d_inode;
2388         struct rpc_cred *cred = NULL;
2389         struct nfs4_state *state = NULL;
2390         int status;
2391
2392         if (pnfs_ld_layoutret_on_setattr(inode))
2393                 pnfs_return_layout(inode);
2394
2395         nfs_fattr_init(fattr);
2396
2397         /* Search for an existing open(O_WRITE) file */
2398         if (sattr->ia_valid & ATTR_FILE) {
2399                 struct nfs_open_context *ctx;
2400
2401                 ctx = nfs_file_open_context(sattr->ia_file);
2402                 if (ctx) {
2403                         cred = ctx->cred;
2404                         state = ctx->state;
2405                 }
2406         }
2407
2408         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2409         if (status == 0)
2410                 nfs_setattr_update_inode(inode, sattr);
2411         return status;
2412 }
2413
2414 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2415                 const struct qstr *name, struct nfs_fh *fhandle,
2416                 struct nfs_fattr *fattr)
2417 {
2418         struct nfs_server *server = NFS_SERVER(dir);
2419         int                    status;
2420         struct nfs4_lookup_arg args = {
2421                 .bitmask = server->attr_bitmask,
2422                 .dir_fh = NFS_FH(dir),
2423                 .name = name,
2424         };
2425         struct nfs4_lookup_res res = {
2426                 .server = server,
2427                 .fattr = fattr,
2428                 .fh = fhandle,
2429         };
2430         struct rpc_message msg = {
2431                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2432                 .rpc_argp = &args,
2433                 .rpc_resp = &res,
2434         };
2435
2436         nfs_fattr_init(fattr);
2437
2438         dprintk("NFS call  lookup %s\n", name->name);
2439         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2440         dprintk("NFS reply lookup: %d\n", status);
2441         return status;
2442 }
2443
2444 void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr, struct nfs_fh *fh)
2445 {
2446         memset(fh, 0, sizeof(struct nfs_fh));
2447         fattr->fsid.major = 1;
2448         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2449                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_FSID | NFS_ATTR_FATTR_MOUNTPOINT;
2450         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2451         fattr->nlink = 2;
2452 }
2453
2454 static int nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, struct qstr *name,
2455                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2456 {
2457         struct nfs4_exception exception = { };
2458         int err;
2459         do {
2460                 int status;
2461
2462                 status = _nfs4_proc_lookup(clnt, dir, name, fhandle, fattr);
2463                 switch (status) {
2464                 case -NFS4ERR_BADNAME:
2465                         return -ENOENT;
2466                 case -NFS4ERR_MOVED:
2467                         err = nfs4_get_referral(dir, name, fattr, fhandle);
2468                         break;
2469                 case -NFS4ERR_WRONGSEC:
2470                         nfs_fixup_secinfo_attributes(fattr, fhandle);
2471                 }
2472                 err = nfs4_handle_exception(NFS_SERVER(dir),
2473                                 status, &exception);
2474         } while (exception.retry);
2475         return err;
2476 }
2477
2478 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2479 {
2480         struct nfs_server *server = NFS_SERVER(inode);
2481         struct nfs4_accessargs args = {
2482                 .fh = NFS_FH(inode),
2483                 .bitmask = server->attr_bitmask,
2484         };
2485         struct nfs4_accessres res = {
2486                 .server = server,
2487         };
2488         struct rpc_message msg = {
2489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2490                 .rpc_argp = &args,
2491                 .rpc_resp = &res,
2492                 .rpc_cred = entry->cred,
2493         };
2494         int mode = entry->mask;
2495         int status;
2496
2497         /*
2498          * Determine which access bits we want to ask for...
2499          */
2500         if (mode & MAY_READ)
2501                 args.access |= NFS4_ACCESS_READ;
2502         if (S_ISDIR(inode->i_mode)) {
2503                 if (mode & MAY_WRITE)
2504                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2505                 if (mode & MAY_EXEC)
2506                         args.access |= NFS4_ACCESS_LOOKUP;
2507         } else {
2508                 if (mode & MAY_WRITE)
2509                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2510                 if (mode & MAY_EXEC)
2511                         args.access |= NFS4_ACCESS_EXECUTE;
2512         }
2513
2514         res.fattr = nfs_alloc_fattr();
2515         if (res.fattr == NULL)
2516                 return -ENOMEM;
2517
2518         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2519         if (!status) {
2520                 entry->mask = 0;
2521                 if (res.access & NFS4_ACCESS_READ)
2522                         entry->mask |= MAY_READ;
2523                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2524                         entry->mask |= MAY_WRITE;
2525                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2526                         entry->mask |= MAY_EXEC;
2527                 nfs_refresh_inode(inode, res.fattr);
2528         }
2529         nfs_free_fattr(res.fattr);
2530         return status;
2531 }
2532
2533 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2534 {
2535         struct nfs4_exception exception = { };
2536         int err;
2537         do {
2538                 err = nfs4_handle_exception(NFS_SERVER(inode),
2539                                 _nfs4_proc_access(inode, entry),
2540                                 &exception);
2541         } while (exception.retry);
2542         return err;
2543 }
2544
2545 /*
2546  * TODO: For the time being, we don't try to get any attributes
2547  * along with any of the zero-copy operations READ, READDIR,
2548  * READLINK, WRITE.
2549  *
2550  * In the case of the first three, we want to put the GETATTR
2551  * after the read-type operation -- this is because it is hard
2552  * to predict the length of a GETATTR response in v4, and thus
2553  * align the READ data correctly.  This means that the GETATTR
2554  * may end up partially falling into the page cache, and we should
2555  * shift it into the 'tail' of the xdr_buf before processing.
2556  * To do this efficiently, we need to know the total length
2557  * of data received, which doesn't seem to be available outside
2558  * of the RPC layer.
2559  *
2560  * In the case of WRITE, we also want to put the GETATTR after
2561  * the operation -- in this case because we want to make sure
2562  * we get the post-operation mtime and size.  This means that
2563  * we can't use xdr_encode_pages() as written: we need a variant
2564  * of it which would leave room in the 'tail' iovec.
2565  *
2566  * Both of these changes to the XDR layer would in fact be quite
2567  * minor, but I decided to leave them for a subsequent patch.
2568  */
2569 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2570                 unsigned int pgbase, unsigned int pglen)
2571 {
2572         struct nfs4_readlink args = {
2573                 .fh       = NFS_FH(inode),
2574                 .pgbase   = pgbase,
2575                 .pglen    = pglen,
2576                 .pages    = &page,
2577         };
2578         struct nfs4_readlink_res res;
2579         struct rpc_message msg = {
2580                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2581                 .rpc_argp = &args,
2582                 .rpc_resp = &res,
2583         };
2584
2585         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2586 }
2587
2588 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2589                 unsigned int pgbase, unsigned int pglen)
2590 {
2591         struct nfs4_exception exception = { };
2592         int err;
2593         do {
2594                 err = nfs4_handle_exception(NFS_SERVER(inode),
2595                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2596                                 &exception);
2597         } while (exception.retry);
2598         return err;
2599 }
2600
2601 /*
2602  * Got race?
2603  * We will need to arrange for the VFS layer to provide an atomic open.
2604  * Until then, this create/open method is prone to inefficiency and race
2605  * conditions due to the lookup, create, and open VFS calls from sys_open()
2606  * placed on the wire.
2607  *
2608  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2609  * The file will be opened again in the subsequent VFS open call
2610  * (nfs4_proc_file_open).
2611  *
2612  * The open for read will just hang around to be used by any process that
2613  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2614  */
2615
2616 static int
2617 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2618                  int flags, struct nfs_open_context *ctx)
2619 {
2620         struct dentry *de = dentry;
2621         struct nfs4_state *state;
2622         struct rpc_cred *cred = NULL;
2623         fmode_t fmode = 0;
2624         int status = 0;
2625
2626         if (ctx != NULL) {
2627                 cred = ctx->cred;
2628                 de = ctx->dentry;
2629                 fmode = ctx->mode;
2630         }
2631         sattr->ia_mode &= ~current_umask();
2632         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2633         d_drop(dentry);
2634         if (IS_ERR(state)) {
2635                 status = PTR_ERR(state);
2636                 goto out;
2637         }
2638         d_add(dentry, igrab(state->inode));
2639         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2640         if (ctx != NULL)
2641                 ctx->state = state;
2642         else
2643                 nfs4_close_sync(state, fmode);
2644 out:
2645         return status;
2646 }
2647
2648 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2649 {
2650         struct nfs_server *server = NFS_SERVER(dir);
2651         struct nfs_removeargs args = {
2652                 .fh = NFS_FH(dir),
2653                 .name.len = name->len,
2654                 .name.name = name->name,
2655                 .bitmask = server->attr_bitmask,
2656         };
2657         struct nfs_removeres res = {
2658                 .server = server,
2659         };
2660         struct rpc_message msg = {
2661                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2662                 .rpc_argp = &args,
2663                 .rpc_resp = &res,
2664         };
2665         int status = -ENOMEM;
2666
2667         res.dir_attr = nfs_alloc_fattr();
2668         if (res.dir_attr == NULL)
2669                 goto out;
2670
2671         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2672         if (status == 0) {
2673                 update_changeattr(dir, &res.cinfo);
2674                 nfs_post_op_update_inode(dir, res.dir_attr);
2675         }
2676         nfs_free_fattr(res.dir_attr);
2677 out:
2678         return status;
2679 }
2680
2681 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2682 {
2683         struct nfs4_exception exception = { };
2684         int err;
2685         do {
2686                 err = nfs4_handle_exception(NFS_SERVER(dir),
2687                                 _nfs4_proc_remove(dir, name),
2688                                 &exception);
2689         } while (exception.retry);
2690         return err;
2691 }
2692
2693 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2694 {
2695         struct nfs_server *server = NFS_SERVER(dir);
2696         struct nfs_removeargs *args = msg->rpc_argp;
2697         struct nfs_removeres *res = msg->rpc_resp;
2698
2699         args->bitmask = server->cache_consistency_bitmask;
2700         res->server = server;
2701         res->seq_res.sr_slot = NULL;
2702         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2703 }
2704
2705 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2706 {
2707         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2708
2709         if (!nfs4_sequence_done(task, &res->seq_res))
2710                 return 0;
2711         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2712                 return 0;
2713         update_changeattr(dir, &res->cinfo);
2714         nfs_post_op_update_inode(dir, res->dir_attr);
2715         return 1;
2716 }
2717
2718 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2719 {
2720         struct nfs_server *server = NFS_SERVER(dir);
2721         struct nfs_renameargs *arg = msg->rpc_argp;
2722         struct nfs_renameres *res = msg->rpc_resp;
2723
2724         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2725         arg->bitmask = server->attr_bitmask;
2726         res->server = server;
2727 }
2728
2729 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2730                                  struct inode *new_dir)
2731 {
2732         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2733
2734         if (!nfs4_sequence_done(task, &res->seq_res))
2735                 return 0;
2736         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2737                 return 0;
2738
2739         update_changeattr(old_dir, &res->old_cinfo);
2740         nfs_post_op_update_inode(old_dir, res->old_fattr);
2741         update_changeattr(new_dir, &res->new_cinfo);
2742         nfs_post_op_update_inode(new_dir, res->new_fattr);
2743         return 1;
2744 }
2745
2746 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2747                 struct inode *new_dir, struct qstr *new_name)
2748 {
2749         struct nfs_server *server = NFS_SERVER(old_dir);
2750         struct nfs_renameargs arg = {
2751                 .old_dir = NFS_FH(old_dir),
2752                 .new_dir = NFS_FH(new_dir),
2753                 .old_name = old_name,
2754                 .new_name = new_name,
2755                 .bitmask = server->attr_bitmask,
2756         };
2757         struct nfs_renameres res = {
2758                 .server = server,
2759         };
2760         struct rpc_message msg = {
2761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2762                 .rpc_argp = &arg,
2763                 .rpc_resp = &res,
2764         };
2765         int status = -ENOMEM;
2766
2767         res.old_fattr = nfs_alloc_fattr();
2768         res.new_fattr = nfs_alloc_fattr();
2769         if (res.old_fattr == NULL || res.new_fattr == NULL)
2770                 goto out;
2771
2772         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2773         if (!status) {
2774                 update_changeattr(old_dir, &res.old_cinfo);
2775                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2776                 update_changeattr(new_dir, &res.new_cinfo);
2777                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2778         }
2779 out:
2780         nfs_free_fattr(res.new_fattr);
2781         nfs_free_fattr(res.old_fattr);
2782         return status;
2783 }
2784
2785 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2786                 struct inode *new_dir, struct qstr *new_name)
2787 {
2788         struct nfs4_exception exception = { };
2789         int err;
2790         do {
2791                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2792                                 _nfs4_proc_rename(old_dir, old_name,
2793                                         new_dir, new_name),
2794                                 &exception);
2795         } while (exception.retry);
2796         return err;
2797 }
2798
2799 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2800 {
2801         struct nfs_server *server = NFS_SERVER(inode);
2802         struct nfs4_link_arg arg = {
2803                 .fh     = NFS_FH(inode),
2804                 .dir_fh = NFS_FH(dir),
2805                 .name   = name,
2806                 .bitmask = server->attr_bitmask,
2807         };
2808         struct nfs4_link_res res = {
2809                 .server = server,
2810         };
2811         struct rpc_message msg = {
2812                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2813                 .rpc_argp = &arg,
2814                 .rpc_resp = &res,
2815         };
2816         int status = -ENOMEM;
2817
2818         res.fattr = nfs_alloc_fattr();
2819         res.dir_attr = nfs_alloc_fattr();
2820         if (res.fattr == NULL || res.dir_attr == NULL)
2821                 goto out;
2822
2823         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2824         if (!status) {
2825                 update_changeattr(dir, &res.cinfo);
2826                 nfs_post_op_update_inode(dir, res.dir_attr);
2827                 nfs_post_op_update_inode(inode, res.fattr);
2828         }
2829 out:
2830         nfs_free_fattr(res.dir_attr);
2831         nfs_free_fattr(res.fattr);
2832         return status;
2833 }
2834
2835 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2836 {
2837         struct nfs4_exception exception = { };
2838         int err;
2839         do {
2840                 err = nfs4_handle_exception(NFS_SERVER(inode),
2841                                 _nfs4_proc_link(inode, dir, name),
2842                                 &exception);
2843         } while (exception.retry);
2844         return err;
2845 }
2846
2847 struct nfs4_createdata {
2848         struct rpc_message msg;
2849         struct nfs4_create_arg arg;
2850         struct nfs4_create_res res;
2851         struct nfs_fh fh;
2852         struct nfs_fattr fattr;
2853         struct nfs_fattr dir_fattr;
2854 };
2855
2856 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2857                 struct qstr *name, struct iattr *sattr, u32 ftype)
2858 {
2859         struct nfs4_createdata *data;
2860
2861         data = kzalloc(sizeof(*data), GFP_KERNEL);
2862         if (data != NULL) {
2863                 struct nfs_server *server = NFS_SERVER(dir);
2864
2865                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2866                 data->msg.rpc_argp = &data->arg;
2867                 data->msg.rpc_resp = &data->res;
2868                 data->arg.dir_fh = NFS_FH(dir);
2869                 data->arg.server = server;
2870                 data->arg.name = name;
2871                 data->arg.attrs = sattr;
2872                 data->arg.ftype = ftype;
2873                 data->arg.bitmask = server->attr_bitmask;
2874                 data->res.server = server;
2875                 data->res.fh = &data->fh;
2876                 data->res.fattr = &data->fattr;
2877                 data->res.dir_fattr = &data->dir_fattr;
2878                 nfs_fattr_init(data->res.fattr);
2879                 nfs_fattr_init(data->res.dir_fattr);
2880         }
2881         return data;
2882 }
2883
2884 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2885 {
2886         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
2887                                     &data->arg.seq_args, &data->res.seq_res, 1);
2888         if (status == 0) {
2889                 update_changeattr(dir, &data->res.dir_cinfo);
2890                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2891                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2892         }
2893         return status;
2894 }
2895
2896 static void nfs4_free_createdata(struct nfs4_createdata *data)
2897 {
2898         kfree(data);
2899 }
2900
2901 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2902                 struct page *page, unsigned int len, struct iattr *sattr)
2903 {
2904         struct nfs4_createdata *data;
2905         int status = -ENAMETOOLONG;
2906
2907         if (len > NFS4_MAXPATHLEN)
2908                 goto out;
2909
2910         status = -ENOMEM;
2911         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2912         if (data == NULL)
2913                 goto out;
2914
2915         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2916         data->arg.u.symlink.pages = &page;
2917         data->arg.u.symlink.len = len;
2918
2919         status = nfs4_do_create(dir, dentry, data);
2920
2921         nfs4_free_createdata(data);
2922 out:
2923         return status;
2924 }
2925
2926 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2927                 struct page *page, unsigned int len, struct iattr *sattr)
2928 {
2929         struct nfs4_exception exception = { };
2930         int err;
2931         do {
2932                 err = nfs4_handle_exception(NFS_SERVER(dir),
2933                                 _nfs4_proc_symlink(dir, dentry, page,
2934                                                         len, sattr),
2935                                 &exception);
2936         } while (exception.retry);
2937         return err;
2938 }
2939
2940 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2941                 struct iattr *sattr)
2942 {
2943         struct nfs4_createdata *data;
2944         int status = -ENOMEM;
2945
2946         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2947         if (data == NULL)
2948                 goto out;
2949
2950         status = nfs4_do_create(dir, dentry, data);
2951
2952         nfs4_free_createdata(data);
2953 out:
2954         return status;
2955 }
2956
2957 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2958                 struct iattr *sattr)
2959 {
2960         struct nfs4_exception exception = { };
2961         int err;
2962
2963         sattr->ia_mode &= ~current_umask();
2964         do {
2965                 err = nfs4_handle_exception(NFS_SERVER(dir),
2966                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2967                                 &exception);
2968         } while (exception.retry);
2969         return err;
2970 }
2971
2972 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2973                 u64 cookie, struct page **pages, unsigned int count, int plus)
2974 {
2975         struct inode            *dir = dentry->d_inode;
2976         struct nfs4_readdir_arg args = {
2977                 .fh = NFS_FH(dir),
2978                 .pages = pages,
2979                 .pgbase = 0,
2980                 .count = count,
2981                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2982                 .plus = plus,
2983         };
2984         struct nfs4_readdir_res res;
2985         struct rpc_message msg = {
2986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2987                 .rpc_argp = &args,
2988                 .rpc_resp = &res,
2989                 .rpc_cred = cred,
2990         };
2991         int                     status;
2992
2993         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2994                         dentry->d_parent->d_name.name,
2995                         dentry->d_name.name,
2996                         (unsigned long long)cookie);
2997         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2998         res.pgbase = args.pgbase;
2999         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3000         if (status >= 0) {
3001                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3002                 status += args.pgbase;
3003         }
3004
3005         nfs_invalidate_atime(dir);
3006
3007         dprintk("%s: returns %d\n", __func__, status);
3008         return status;
3009 }
3010
3011 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3012                 u64 cookie, struct page **pages, unsigned int count, int plus)
3013 {
3014         struct nfs4_exception exception = { };
3015         int err;
3016         do {
3017                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3018                                 _nfs4_proc_readdir(dentry, cred, cookie,
3019                                         pages, count, plus),
3020                                 &exception);
3021         } while (exception.retry);
3022         return err;
3023 }
3024
3025 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3026                 struct iattr *sattr, dev_t rdev)
3027 {
3028         struct nfs4_createdata *data;
3029         int mode = sattr->ia_mode;
3030         int status = -ENOMEM;
3031
3032         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3033         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3034
3035         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3036         if (data == NULL)
3037                 goto out;
3038
3039         if (S_ISFIFO(mode))
3040                 data->arg.ftype = NF4FIFO;
3041         else if (S_ISBLK(mode)) {
3042                 data->arg.ftype = NF4BLK;
3043                 data->arg.u.device.specdata1 = MAJOR(rdev);
3044                 data->arg.u.device.specdata2 = MINOR(rdev);
3045         }
3046         else if (S_ISCHR(mode)) {
3047                 data->arg.ftype = NF4CHR;
3048                 data->arg.u.device.specdata1 = MAJOR(rdev);
3049                 data->arg.u.device.specdata2 = MINOR(rdev);
3050         }
3051
3052         status = nfs4_do_create(dir, dentry, data);
3053
3054         nfs4_free_createdata(data);
3055 out:
3056         return status;
3057 }
3058
3059 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3060                 struct iattr *sattr, dev_t rdev)
3061 {
3062         struct nfs4_exception exception = { };
3063         int err;
3064
3065         sattr->ia_mode &= ~current_umask();
3066         do {
3067                 err = nfs4_handle_exception(NFS_SERVER(dir),
3068                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3069                                 &exception);
3070         } while (exception.retry);
3071         return err;
3072 }
3073
3074 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3075                  struct nfs_fsstat *fsstat)
3076 {
3077         struct nfs4_statfs_arg args = {
3078                 .fh = fhandle,
3079                 .bitmask = server->attr_bitmask,
3080         };
3081         struct nfs4_statfs_res res = {
3082                 .fsstat = fsstat,
3083         };
3084         struct rpc_message msg = {
3085                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3086                 .rpc_argp = &args,
3087                 .rpc_resp = &res,
3088         };
3089
3090         nfs_fattr_init(fsstat->fattr);
3091         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3092 }
3093
3094 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3095 {
3096         struct nfs4_exception exception = { };
3097         int err;
3098         do {
3099                 err = nfs4_handle_exception(server,
3100                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3101                                 &exception);
3102         } while (exception.retry);
3103         return err;
3104 }
3105
3106 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3107                 struct nfs_fsinfo *fsinfo)
3108 {
3109         struct nfs4_fsinfo_arg args = {
3110                 .fh = fhandle,
3111                 .bitmask = server->attr_bitmask,
3112         };
3113         struct nfs4_fsinfo_res res = {
3114                 .fsinfo = fsinfo,
3115         };
3116         struct rpc_message msg = {
3117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3118                 .rpc_argp = &args,
3119                 .rpc_resp = &res,
3120         };
3121
3122         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3123 }
3124
3125 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3126 {
3127         struct nfs4_exception exception = { };
3128         int err;
3129
3130         do {
3131                 err = nfs4_handle_exception(server,
3132                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3133                                 &exception);
3134         } while (exception.retry);
3135         return err;
3136 }
3137
3138 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3139 {
3140         nfs_fattr_init(fsinfo->fattr);
3141         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3142 }
3143
3144 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3145                 struct nfs_pathconf *pathconf)
3146 {
3147         struct nfs4_pathconf_arg args = {
3148                 .fh = fhandle,
3149                 .bitmask = server->attr_bitmask,
3150         };
3151         struct nfs4_pathconf_res res = {
3152                 .pathconf = pathconf,
3153         };
3154         struct rpc_message msg = {
3155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3156                 .rpc_argp = &args,
3157                 .rpc_resp = &res,
3158         };
3159
3160         /* None of the pathconf attributes are mandatory to implement */
3161         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3162                 memset(pathconf, 0, sizeof(*pathconf));
3163                 return 0;
3164         }
3165
3166         nfs_fattr_init(pathconf->fattr);
3167         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3168 }
3169
3170 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3171                 struct nfs_pathconf *pathconf)
3172 {
3173         struct nfs4_exception exception = { };
3174         int err;
3175
3176         do {
3177                 err = nfs4_handle_exception(server,
3178                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3179                                 &exception);
3180         } while (exception.retry);
3181         return err;
3182 }
3183
3184 void __nfs4_read_done_cb(struct nfs_read_data *data)
3185 {
3186         nfs_invalidate_atime(data->inode);
3187 }
3188
3189 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3190 {
3191         struct nfs_server *server = NFS_SERVER(data->inode);
3192
3193         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3194                 nfs_restart_rpc(task, server->nfs_client);
3195                 return -EAGAIN;
3196         }
3197
3198         __nfs4_read_done_cb(data);
3199         if (task->tk_status > 0)
3200                 renew_lease(server, data->timestamp);
3201         return 0;
3202 }
3203
3204 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3205 {
3206
3207         dprintk("--> %s\n", __func__);
3208
3209         if (!nfs4_sequence_done(task, &data->res.seq_res))
3210                 return -EAGAIN;
3211
3212         return data->read_done_cb ? data->read_done_cb(task, data) :
3213                                     nfs4_read_done_cb(task, data);
3214 }
3215
3216 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3217 {
3218         data->timestamp   = jiffies;
3219         data->read_done_cb = nfs4_read_done_cb;
3220         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3221 }
3222
3223 /* Reset the the nfs_read_data to send the read to the MDS. */
3224 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3225 {
3226         dprintk("%s Reset task for i/o through\n", __func__);
3227         put_lseg(data->lseg);
3228         data->lseg = NULL;
3229         /* offsets will differ in the dense stripe case */
3230         data->args.offset = data->mds_offset;
3231         data->ds_clp = NULL;
3232         data->args.fh     = NFS_FH(data->inode);
3233         data->read_done_cb = nfs4_read_done_cb;
3234         task->tk_ops = data->mds_ops;
3235         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3236 }
3237 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3238
3239 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3240 {
3241         struct inode *inode = data->inode;
3242
3243         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3244                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3245                 return -EAGAIN;
3246         }
3247         if (task->tk_status >= 0) {
3248                 renew_lease(NFS_SERVER(inode), data->timestamp);
3249                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3250         }
3251         return 0;
3252 }
3253
3254 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3255 {
3256         if (!nfs4_sequence_done(task, &data->res.seq_res))
3257                 return -EAGAIN;
3258         return data->write_done_cb ? data->write_done_cb(task, data) :
3259                 nfs4_write_done_cb(task, data);
3260 }
3261
3262 /* Reset the the nfs_write_data to send the write to the MDS. */
3263 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3264 {
3265         dprintk("%s Reset task for i/o through\n", __func__);
3266         put_lseg(data->lseg);
3267         data->lseg          = NULL;
3268         data->ds_clp        = NULL;
3269         data->write_done_cb = nfs4_write_done_cb;
3270         data->args.fh       = NFS_FH(data->inode);
3271         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3272         data->args.offset   = data->mds_offset;
3273         data->res.fattr     = &data->fattr;
3274         task->tk_ops        = data->mds_ops;
3275         rpc_task_reset_client(task, NFS_CLIENT(data->inode));
3276 }
3277 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3278
3279 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3280 {
3281         struct nfs_server *server = NFS_SERVER(data->inode);
3282
3283         if (data->lseg) {
3284                 data->args.bitmask = NULL;
3285                 data->res.fattr = NULL;
3286         } else
3287                 data->args.bitmask = server->cache_consistency_bitmask;
3288         if (!data->write_done_cb)
3289                 data->write_done_cb = nfs4_write_done_cb;
3290         data->res.server = server;
3291         data->timestamp   = jiffies;
3292
3293         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3294 }
3295
3296 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3297 {
3298         struct inode *inode = data->inode;
3299
3300         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3301                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3302                 return -EAGAIN;
3303         }
3304         nfs_refresh_inode(inode, data->res.fattr);
3305         return 0;
3306 }
3307
3308 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3309 {
3310         if (!nfs4_sequence_done(task, &data->res.seq_res))
3311                 return -EAGAIN;
3312         return data->write_done_cb(task, data);
3313 }
3314
3315 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3316 {
3317         struct nfs_server *server = NFS_SERVER(data->inode);
3318
3319         if (data->lseg) {
3320                 data->args.bitmask = NULL;
3321                 data->res.fattr = NULL;
3322         } else
3323                 data->args.bitmask = server->cache_consistency_bitmask;
3324         if (!data->write_done_cb)
3325                 data->write_done_cb = nfs4_commit_done_cb;
3326         data->res.server = server;
3327         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3328 }
3329
3330 struct nfs4_renewdata {
3331         struct nfs_client       *client;
3332         unsigned long           timestamp;
3333 };
3334
3335 /*
3336  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3337  * standalone procedure for queueing an asynchronous RENEW.
3338  */
3339 static void nfs4_renew_release(void *calldata)
3340 {
3341         struct nfs4_renewdata *data = calldata;
3342         struct nfs_client *clp = data->client;
3343
3344         if (atomic_read(&clp->cl_count) > 1)
3345                 nfs4_schedule_state_renewal(clp);
3346         nfs_put_client(clp);
3347         kfree(data);
3348 }
3349
3350 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3351 {
3352         struct nfs4_renewdata *data = calldata;
3353         struct nfs_client *clp = data->client;
3354         unsigned long timestamp = data->timestamp;
3355
3356         if (task->tk_status < 0) {
3357                 /* Unless we're shutting down, schedule state recovery! */
3358                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3359                         return;
3360                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3361                         nfs4_schedule_lease_recovery(clp);
3362                         return;
3363                 }
3364                 nfs4_schedule_path_down_recovery(clp);
3365         }
3366         do_renew_lease(clp, timestamp);
3367 }
3368
3369 static const struct rpc_call_ops nfs4_renew_ops = {
3370         .rpc_call_done = nfs4_renew_done,
3371         .rpc_release = nfs4_renew_release,
3372 };
3373
3374 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3375 {
3376         struct rpc_message msg = {
3377                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3378                 .rpc_argp       = clp,
3379                 .rpc_cred       = cred,
3380         };
3381         struct nfs4_renewdata *data;
3382
3383         if (renew_flags == 0)
3384                 return 0;
3385         if (!atomic_inc_not_zero(&clp->cl_count))
3386                 return -EIO;
3387         data = kmalloc(sizeof(*data), GFP_NOFS);
3388         if (data == NULL)
3389                 return -ENOMEM;
3390         data->client = clp;
3391         data->timestamp = jiffies;
3392         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3393                         &nfs4_renew_ops, data);
3394 }
3395
3396 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3397 {
3398         struct rpc_message msg = {
3399                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3400                 .rpc_argp       = clp,
3401                 .rpc_cred       = cred,
3402         };
3403         unsigned long now = jiffies;
3404         int status;
3405
3406         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3407         if (status < 0)
3408                 return status;
3409         do_renew_lease(clp, now);
3410         return 0;
3411 }
3412
3413 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3414 {
3415         return (server->caps & NFS_CAP_ACLS)
3416                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3417                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3418 }
3419
3420 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3421  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3422  * the stack.
3423  */
3424 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3425
3426 static void buf_to_pages(const void *buf, size_t buflen,
3427                 struct page **pages, unsigned int *pgbase)
3428 {
3429         const void *p = buf;
3430
3431         *pgbase = offset_in_page(buf);
3432         p -= *pgbase;
3433         while (p < buf + buflen) {
3434                 *(pages++) = virt_to_page(p);
3435                 p += PAGE_CACHE_SIZE;
3436         }
3437 }
3438
3439 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3440                 struct page **pages, unsigned int *pgbase)
3441 {
3442         struct page *newpage, **spages;
3443         int rc = 0;
3444         size_t len;
3445         spages = pages;
3446
3447         do {
3448                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3449                 newpage = alloc_page(GFP_KERNEL);
3450
3451                 if (newpage == NULL)
3452                         goto unwind;
3453                 memcpy(page_address(newpage), buf, len);
3454                 buf += len;
3455                 buflen -= len;
3456                 *pages++ = newpage;
3457                 rc++;
3458         } while (buflen != 0);
3459
3460         return rc;
3461
3462 unwind:
3463         for(; rc > 0; rc--)
3464                 __free_page(spages[rc-1]);
3465         return -ENOMEM;
3466 }
3467
3468 struct nfs4_cached_acl {
3469         int cached;
3470         size_t len;
3471         char data[0];
3472 };
3473
3474 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3475 {
3476         struct nfs_inode *nfsi = NFS_I(inode);
3477
3478         spin_lock(&inode->i_lock);
3479         kfree(nfsi->nfs4_acl);
3480         nfsi->nfs4_acl = acl;
3481         spin_unlock(&inode->i_lock);
3482 }
3483
3484 static void nfs4_zap_acl_attr(struct inode *inode)
3485 {
3486         nfs4_set_cached_acl(inode, NULL);
3487 }
3488
3489 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3490 {
3491         struct nfs_inode *nfsi = NFS_I(inode);
3492         struct nfs4_cached_acl *acl;
3493         int ret = -ENOENT;
3494
3495         spin_lock(&inode->i_lock);
3496         acl = nfsi->nfs4_acl;
3497         if (acl == NULL)
3498                 goto out;
3499         if (buf == NULL) /* user is just asking for length */
3500                 goto out_len;
3501         if (acl->cached == 0)
3502                 goto out;
3503         ret = -ERANGE; /* see getxattr(2) man page */
3504         if (acl->len > buflen)
3505                 goto out;
3506         memcpy(buf, acl->data, acl->len);
3507 out_len:
3508         ret = acl->len;
3509 out:
3510         spin_unlock(&inode->i_lock);
3511         return ret;
3512 }
3513
3514 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3515 {
3516         struct nfs4_cached_acl *acl;
3517
3518         if (buf && acl_len <= PAGE_SIZE) {
3519                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3520                 if (acl == NULL)
3521                         goto out;
3522                 acl->cached = 1;
3523                 memcpy(acl->data, buf, acl_len);
3524         } else {
3525                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3526                 if (acl == NULL)
3527                         goto out;
3528                 acl->cached = 0;
3529         }
3530         acl->len = acl_len;
3531 out:
3532         nfs4_set_cached_acl(inode, acl);
3533 }
3534
3535 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3536 {
3537         struct page *pages[NFS4ACL_MAXPAGES];
3538         struct nfs_getaclargs args = {
3539                 .fh = NFS_FH(inode),
3540                 .acl_pages = pages,
3541                 .acl_len = buflen,
3542         };
3543         struct nfs_getaclres res = {
3544                 .acl_len = buflen,
3545         };
3546         void *resp_buf;
3547         struct rpc_message msg = {
3548                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3549                 .rpc_argp = &args,
3550                 .rpc_resp = &res,
3551         };
3552         struct page *localpage = NULL;
3553         int ret;
3554
3555         if (buflen < PAGE_SIZE) {
3556                 /* As long as we're doing a round trip to the server anyway,
3557                  * let's be prepared for a page of acl data. */
3558                 localpage = alloc_page(GFP_KERNEL);
3559                 resp_buf = page_address(localpage);
3560                 if (localpage == NULL)
3561                         return -ENOMEM;
3562                 args.acl_pages[0] = localpage;
3563                 args.acl_pgbase = 0;
3564                 args.acl_len = PAGE_SIZE;
3565         } else {
3566                 resp_buf = buf;
3567                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3568         }
3569         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3570         if (ret)
3571                 goto out_free;
3572         if (res.acl_len > args.acl_len)
3573                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3574         else
3575                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3576         if (buf) {
3577                 ret = -ERANGE;
3578                 if (res.acl_len > buflen)
3579                         goto out_free;
3580                 if (localpage)
3581                         memcpy(buf, resp_buf, res.acl_len);
3582         }
3583         ret = res.acl_len;
3584 out_free:
3585         if (localpage)
3586                 __free_page(localpage);
3587         return ret;
3588 }
3589
3590 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3591 {
3592         struct nfs4_exception exception = { };
3593         ssize_t ret;
3594         do {
3595                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3596                 if (ret >= 0)
3597                         break;
3598                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3599         } while (exception.retry);
3600         return ret;
3601 }
3602
3603 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3604 {
3605         struct nfs_server *server = NFS_SERVER(inode);
3606         int ret;
3607
3608         if (!nfs4_server_supports_acls(server))
3609                 return -EOPNOTSUPP;
3610         ret = nfs_revalidate_inode(server, inode);
3611         if (ret < 0)
3612                 return ret;
3613         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3614                 nfs_zap_acl_cache(inode);
3615         ret = nfs4_read_cached_acl(inode, buf, buflen);
3616         if (ret != -ENOENT)
3617                 return ret;
3618         return nfs4_get_acl_uncached(inode, buf, buflen);
3619 }
3620
3621 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3622 {
3623         struct nfs_server *server = NFS_SERVER(inode);
3624         struct page *pages[NFS4ACL_MAXPAGES];
3625         struct nfs_setaclargs arg = {
3626                 .fh             = NFS_FH(inode),
3627                 .acl_pages      = pages,
3628                 .acl_len        = buflen,
3629         };
3630         struct nfs_setaclres res;
3631         struct rpc_message msg = {
3632                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3633                 .rpc_argp       = &arg,
3634                 .rpc_resp       = &res,
3635         };
3636         int ret, i;
3637
3638         if (!nfs4_server_supports_acls(server))
3639                 return -EOPNOTSUPP;
3640         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3641         if (i < 0)
3642                 return i;
3643         nfs_inode_return_delegation(inode);
3644         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3645
3646         /*
3647          * Free each page after tx, so the only ref left is
3648          * held by the network stack
3649          */
3650         for (; i > 0; i--)
3651                 put_page(pages[i-1]);
3652
3653         /*
3654          * Acl update can result in inode attribute update.
3655          * so mark the attribute cache invalid.
3656          */
3657         spin_lock(&inode->i_lock);
3658         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3659         spin_unlock(&inode->i_lock);
3660         nfs_access_zap_cache(inode);
3661         nfs_zap_acl_cache(inode);
3662         return ret;
3663 }
3664
3665 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3666 {
3667         struct nfs4_exception exception = { };
3668         int err;
3669         do {
3670                 err = nfs4_handle_exception(NFS_SERVER(inode),
3671                                 __nfs4_proc_set_acl(inode, buf, buflen),
3672                                 &exception);
3673         } while (exception.retry);
3674         return err;
3675 }
3676
3677 static int
3678 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3679 {
3680         struct nfs_client *clp = server->nfs_client;
3681
3682         if (task->tk_status >= 0)
3683                 return 0;
3684         switch(task->tk_status) {
3685                 case -NFS4ERR_ADMIN_REVOKED:
3686                 case -NFS4ERR_BAD_STATEID:
3687                 case -NFS4ERR_OPENMODE:
3688                         if (state == NULL)
3689                                 break;
3690                         nfs4_schedule_stateid_recovery(server, state);
3691                         goto wait_on_recovery;
3692                 case -NFS4ERR_EXPIRED:
3693                         if (state != NULL)
3694                                 nfs4_schedule_stateid_recovery(server, state);
3695                 case -NFS4ERR_STALE_STATEID:
3696                 case -NFS4ERR_STALE_CLIENTID:
3697                         nfs4_schedule_lease_recovery(clp);
3698                         goto wait_on_recovery;
3699 #if defined(CONFIG_NFS_V4_1)
3700                 case -NFS4ERR_BADSESSION:
3701                 case -NFS4ERR_BADSLOT:
3702                 case -NFS4ERR_BAD_HIGH_SLOT:
3703                 case -NFS4ERR_DEADSESSION:
3704                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3705                 case -NFS4ERR_SEQ_FALSE_RETRY:
3706                 case -NFS4ERR_SEQ_MISORDERED:
3707                         dprintk("%s ERROR %d, Reset session\n", __func__,
3708                                 task->tk_status);
3709                         nfs4_schedule_session_recovery(clp->cl_session);
3710                         task->tk_status = 0;
3711                         return -EAGAIN;
3712 #endif /* CONFIG_NFS_V4_1 */
3713                 case -NFS4ERR_DELAY:
3714                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3715                 case -NFS4ERR_GRACE:
3716                 case -EKEYEXPIRED:
3717                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3718                         task->tk_status = 0;
3719                         return -EAGAIN;
3720                 case -NFS4ERR_RETRY_UNCACHED_REP:
3721                 case -NFS4ERR_OLD_STATEID:
3722                         task->tk_status = 0;
3723                         return -EAGAIN;
3724         }
3725         task->tk_status = nfs4_map_errors(task->tk_status);
3726         return 0;
3727 wait_on_recovery:
3728         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3729         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3730                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3731         task->tk_status = 0;
3732         return -EAGAIN;
3733 }
3734
3735 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3736                 unsigned short port, struct rpc_cred *cred,
3737                 struct nfs4_setclientid_res *res)
3738 {
3739         nfs4_verifier sc_verifier;
3740         struct nfs4_setclientid setclientid = {
3741                 .sc_verifier = &sc_verifier,
3742                 .sc_prog = program,
3743                 .sc_cb_ident = clp->cl_cb_ident,
3744         };
3745         struct rpc_message msg = {
3746                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3747                 .rpc_argp = &setclientid,
3748                 .rpc_resp = res,
3749                 .rpc_cred = cred,
3750         };
3751         __be32 *p;
3752         int loop = 0;
3753         int status;
3754
3755         p = (__be32*)sc_verifier.data;
3756         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3757         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3758
3759         for(;;) {
3760                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3761                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3762                                 clp->cl_ipaddr,
3763                                 rpc_peeraddr2str(clp->cl_rpcclient,
3764                                                         RPC_DISPLAY_ADDR),
3765                                 rpc_peeraddr2str(clp->cl_rpcclient,
3766                                                         RPC_DISPLAY_PROTO),
3767                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3768                                 clp->cl_id_uniquifier);
3769                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3770                                 sizeof(setclientid.sc_netid),
3771                                 rpc_peeraddr2str(clp->cl_rpcclient,
3772                                                         RPC_DISPLAY_NETID));
3773                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3774                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3775                                 clp->cl_ipaddr, port >> 8, port & 255);
3776
3777                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3778                 if (status != -NFS4ERR_CLID_INUSE)
3779                         break;
3780                 if (loop != 0) {
3781                         ++clp->cl_id_uniquifier;
3782                         break;
3783                 }
3784                 ++loop;
3785                 ssleep(clp->cl_lease_time / HZ + 1);
3786         }
3787         return status;
3788 }
3789
3790 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3791                 struct nfs4_setclientid_res *arg,
3792                 struct rpc_cred *cred)
3793 {
3794         struct nfs_fsinfo fsinfo;
3795         struct rpc_message msg = {
3796                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3797                 .rpc_argp = arg,
3798                 .rpc_resp = &fsinfo,
3799                 .rpc_cred = cred,
3800         };
3801         unsigned long now;
3802         int status;
3803
3804         now = jiffies;
3805         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3806         if (status == 0) {
3807                 spin_lock(&clp->cl_lock);
3808                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3809                 clp->cl_last_renewal = now;
3810                 spin_unlock(&clp->cl_lock);
3811         }
3812         return status;
3813 }
3814
3815 struct nfs4_delegreturndata {
3816         struct nfs4_delegreturnargs args;
3817         struct nfs4_delegreturnres res;
3818         struct nfs_fh fh;
3819         nfs4_stateid stateid;
3820         unsigned long timestamp;
3821         struct nfs_fattr fattr;
3822         int rpc_status;
3823 };
3824
3825 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3826 {
3827         struct nfs4_delegreturndata *data = calldata;
3828
3829         if (!nfs4_sequence_done(task, &data->res.seq_res))
3830                 return;
3831
3832         switch (task->tk_status) {
3833         case -NFS4ERR_STALE_STATEID:
3834         case -NFS4ERR_EXPIRED:
3835         case 0:
3836                 renew_lease(data->res.server, data->timestamp);
3837                 break;
3838         default:
3839                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3840                                 -EAGAIN) {
3841                         nfs_restart_rpc(task, data->res.server->nfs_client);
3842                         return;
3843                 }
3844         }
3845         data->rpc_status = task->tk_status;
3846 }
3847
3848 static void nfs4_delegreturn_release(void *calldata)
3849 {
3850         kfree(calldata);
3851 }
3852
3853 #if defined(CONFIG_NFS_V4_1)
3854 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3855 {
3856         struct nfs4_delegreturndata *d_data;
3857
3858         d_data = (struct nfs4_delegreturndata *)data;
3859
3860         if (nfs4_setup_sequence(d_data->res.server,
3861                                 &d_data->args.seq_args,
3862                                 &d_data->res.seq_res, 1, task))
3863                 return;
3864         rpc_call_start(task);
3865 }
3866 #endif /* CONFIG_NFS_V4_1 */
3867
3868 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3869 #if defined(CONFIG_NFS_V4_1)
3870         .rpc_call_prepare = nfs4_delegreturn_prepare,
3871 #endif /* CONFIG_NFS_V4_1 */
3872         .rpc_call_done = nfs4_delegreturn_done,
3873         .rpc_release = nfs4_delegreturn_release,
3874 };
3875
3876 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3877 {
3878         struct nfs4_delegreturndata *data;
3879         struct nfs_server *server = NFS_SERVER(inode);
3880         struct rpc_task *task;
3881         struct rpc_message msg = {
3882                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3883                 .rpc_cred = cred,
3884         };
3885         struct rpc_task_setup task_setup_data = {
3886                 .rpc_client = server->client,
3887                 .rpc_message = &msg,
3888                 .callback_ops = &nfs4_delegreturn_ops,
3889                 .flags = RPC_TASK_ASYNC,
3890         };
3891         int status = 0;
3892
3893         data = kzalloc(sizeof(*data), GFP_NOFS);
3894         if (data == NULL)
3895                 return -ENOMEM;
3896         data->args.fhandle = &data->fh;
3897         data->args.stateid = &data->stateid;
3898         data->args.bitmask = server->attr_bitmask;
3899         nfs_copy_fh(&data->fh, NFS_FH(inode));
3900         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3901         data->res.fattr = &data->fattr;
3902         data->res.server = server;
3903         nfs_fattr_init(data->res.fattr);
3904         data->timestamp = jiffies;
3905         data->rpc_status = 0;
3906
3907         task_setup_data.callback_data = data;
3908         msg.rpc_argp = &data->args;
3909         msg.rpc_resp = &data->res;
3910         task = rpc_run_task(&task_setup_data);
3911         if (IS_ERR(task))
3912                 return PTR_ERR(task);
3913         if (!issync)
3914                 goto out;
3915         status = nfs4_wait_for_completion_rpc_task(task);
3916         if (status != 0)
3917                 goto out;
3918         status = data->rpc_status;
3919         if (status != 0)
3920                 goto out;
3921         nfs_refresh_inode(inode, &data->fattr);
3922 out:
3923         rpc_put_task(task);
3924         return status;
3925 }
3926
3927 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3928 {
3929         struct nfs_server *server = NFS_SERVER(inode);
3930         struct nfs4_exception exception = { };
3931         int err;
3932         do {
3933                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3934                 switch (err) {
3935                         case -NFS4ERR_STALE_STATEID:
3936                         case -NFS4ERR_EXPIRED:
3937                         case 0:
3938                                 return 0;
3939                 }
3940                 err = nfs4_handle_exception(server, err, &exception);
3941         } while (exception.retry);
3942         return err;
3943 }
3944
3945 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3946 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3947
3948 /*
3949  * sleep, with exponential backoff, and retry the LOCK operation.
3950  */
3951 static unsigned long
3952 nfs4_set_lock_task_retry(unsigned long timeout)
3953 {
3954         schedule_timeout_killable(timeout);
3955         timeout <<= 1;
3956         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3957                 return NFS4_LOCK_MAXTIMEOUT;
3958         return timeout;
3959 }
3960
3961 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3962 {
3963         struct inode *inode = state->inode;
3964         struct nfs_server *server = NFS_SERVER(inode);
3965         struct nfs_client *clp = server->nfs_client;
3966         struct nfs_lockt_args arg = {
3967                 .fh = NFS_FH(inode),
3968                 .fl = request,
3969         };
3970         struct nfs_lockt_res res = {
3971                 .denied = request,
3972         };
3973         struct rpc_message msg = {
3974                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3975                 .rpc_argp       = &arg,
3976                 .rpc_resp       = &res,
3977                 .rpc_cred       = state->owner->so_cred,
3978         };
3979         struct nfs4_lock_state *lsp;
3980         int status;
3981
3982         arg.lock_owner.clientid = clp->cl_clientid;
3983         status = nfs4_set_lock_state(state, request);
3984         if (status != 0)
3985                 goto out;
3986         lsp = request->fl_u.nfs4_fl.owner;
3987         arg.lock_owner.id = lsp->ls_id.id;
3988         arg.lock_owner.s_dev = server->s_dev;
3989         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3990         switch (status) {
3991                 case 0:
3992                         request->fl_type = F_UNLCK;
3993                         break;
3994                 case -NFS4ERR_DENIED:
3995                         status = 0;
3996         }
3997         request->fl_ops->fl_release_private(request);
3998 out:
3999         return status;
4000 }
4001
4002 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4003 {
4004         struct nfs4_exception exception = { };
4005         int err;
4006
4007         do {
4008                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4009                                 _nfs4_proc_getlk(state, cmd, request),
4010                                 &exception);
4011         } while (exception.retry);
4012         return err;
4013 }
4014
4015 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4016 {
4017         int res = 0;
4018         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4019                 case FL_POSIX:
4020                         res = posix_lock_file_wait(file, fl);
4021                         break;
4022                 case FL_FLOCK:
4023                         res = flock_lock_file_wait(file, fl);
4024                         break;
4025                 default:
4026                         BUG();
4027         }
4028         return res;
4029 }
4030
4031 struct nfs4_unlockdata {
4032         struct nfs_locku_args arg;
4033         struct nfs_locku_res res;
4034         struct nfs4_lock_state *lsp;
4035         struct nfs_open_context *ctx;
4036         struct file_lock fl;
4037         const struct nfs_server *server;
4038         unsigned long timestamp;
4039 };
4040
4041 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4042                 struct nfs_open_context *ctx,
4043                 struct nfs4_lock_state *lsp,
4044                 struct nfs_seqid *seqid)
4045 {
4046         struct nfs4_unlockdata *p;
4047         struct inode *inode = lsp->ls_state->inode;
4048
4049         p = kzalloc(sizeof(*p), GFP_NOFS);
4050         if (p == NULL)
4051                 return NULL;
4052         p->arg.fh = NFS_FH(inode);
4053         p->arg.fl = &p->fl;
4054         p->arg.seqid = seqid;
4055         p->res.seqid = seqid;
4056         p->arg.stateid = &lsp->ls_stateid;
4057         p->lsp = lsp;
4058         atomic_inc(&lsp->ls_count);
4059         /* Ensure we don't close file until we're done freeing locks! */
4060         p->ctx = get_nfs_open_context(ctx);
4061         memcpy(&p->fl, fl, sizeof(p->fl));
4062         p->server = NFS_SERVER(inode);
4063         return p;
4064 }
4065
4066 static void nfs4_locku_release_calldata(void *data)
4067 {
4068         struct nfs4_unlockdata *calldata = data;
4069         nfs_free_seqid(calldata->arg.seqid);
4070         nfs4_put_lock_state(calldata->lsp);
4071         put_nfs_open_context(calldata->ctx);
4072         kfree(calldata);
4073 }
4074
4075 static void nfs4_locku_done(struct rpc_task *task, void *data)
4076 {
4077         struct nfs4_unlockdata *calldata = data;
4078
4079         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4080                 return;
4081         switch (task->tk_status) {
4082                 case 0:
4083                         memcpy(calldata->lsp->ls_stateid.data,
4084                                         calldata->res.stateid.data,
4085                                         sizeof(calldata->lsp->ls_stateid.data));
4086                         renew_lease(calldata->server, calldata->timestamp);
4087                         break;
4088                 case -NFS4ERR_BAD_STATEID:
4089                 case -NFS4ERR_OLD_STATEID:
4090                 case -NFS4ERR_STALE_STATEID:
4091                 case -NFS4ERR_EXPIRED:
4092                         break;
4093                 default:
4094                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4095                                 nfs_restart_rpc(task,
4096                                                  calldata->server->nfs_client);
4097         }
4098 }
4099
4100 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4101 {
4102         struct nfs4_unlockdata *calldata = data;
4103
4104         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4105                 return;
4106         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4107                 /* Note: exit _without_ running nfs4_locku_done */
4108                 task->tk_action = NULL;
4109                 return;
4110         }
4111         calldata->timestamp = jiffies;
4112         if (nfs4_setup_sequence(calldata->server,
4113                                 &calldata->arg.seq_args,
4114                                 &calldata->res.seq_res, 1, task))
4115                 return;
4116         rpc_call_start(task);
4117 }
4118
4119 static const struct rpc_call_ops nfs4_locku_ops = {
4120         .rpc_call_prepare = nfs4_locku_prepare,
4121         .rpc_call_done = nfs4_locku_done,
4122         .rpc_release = nfs4_locku_release_calldata,
4123 };
4124
4125 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4126                 struct nfs_open_context *ctx,
4127                 struct nfs4_lock_state *lsp,
4128                 struct nfs_seqid *seqid)
4129 {
4130         struct nfs4_unlockdata *data;
4131         struct rpc_message msg = {
4132                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4133                 .rpc_cred = ctx->cred,
4134         };
4135         struct rpc_task_setup task_setup_data = {
4136                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4137                 .rpc_message = &msg,
4138                 .callback_ops = &nfs4_locku_ops,
4139                 .workqueue = nfsiod_workqueue,
4140                 .flags = RPC_TASK_ASYNC,
4141         };
4142
4143         /* Ensure this is an unlock - when canceling a lock, the
4144          * canceled lock is passed in, and it won't be an unlock.
4145          */
4146         fl->fl_type = F_UNLCK;
4147
4148         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4149         if (data == NULL) {
4150                 nfs_free_seqid(seqid);
4151                 return ERR_PTR(-ENOMEM);
4152         }
4153
4154         msg.rpc_argp = &data->arg;
4155         msg.rpc_resp = &data->res;
4156         task_setup_data.callback_data = data;
4157         return rpc_run_task(&task_setup_data);
4158 }
4159
4160 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4161 {
4162         struct nfs_inode *nfsi = NFS_I(state->inode);
4163         struct nfs_seqid *seqid;
4164         struct nfs4_lock_state *lsp;
4165         struct rpc_task *task;
4166         int status = 0;
4167         unsigned char fl_flags = request->fl_flags;
4168
4169         status = nfs4_set_lock_state(state, request);
4170         /* Unlock _before_ we do the RPC call */
4171         request->fl_flags |= FL_EXISTS;
4172         down_read(&nfsi->rwsem);
4173         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4174                 up_read(&nfsi->rwsem);
4175                 goto out;
4176         }
4177         up_read(&nfsi->rwsem);
4178         if (status != 0)
4179                 goto out;
4180         /* Is this a delegated lock? */
4181         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4182                 goto out;
4183         lsp = request->fl_u.nfs4_fl.owner;
4184         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4185         status = -ENOMEM;
4186         if (seqid == NULL)
4187                 goto out;
4188         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4189         status = PTR_ERR(task);
4190         if (IS_ERR(task))
4191                 goto out;
4192         status = nfs4_wait_for_completion_rpc_task(task);
4193         rpc_put_task(task);
4194 out:
4195         request->fl_flags = fl_flags;
4196         return status;
4197 }
4198
4199 struct nfs4_lockdata {
4200         struct nfs_lock_args arg;
4201         struct nfs_lock_res res;
4202         struct nfs4_lock_state *lsp;
4203         struct nfs_open_context *ctx;
4204         struct file_lock fl;
4205         unsigned long timestamp;
4206         int rpc_status;
4207         int cancelled;
4208         struct nfs_server *server;
4209 };
4210
4211 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4212                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4213                 gfp_t gfp_mask)
4214 {
4215         struct nfs4_lockdata *p;
4216         struct inode *inode = lsp->ls_state->inode;
4217         struct nfs_server *server = NFS_SERVER(inode);
4218
4219         p = kzalloc(sizeof(*p), gfp_mask);
4220         if (p == NULL)
4221                 return NULL;
4222
4223         p->arg.fh = NFS_FH(inode);
4224         p->arg.fl = &p->fl;
4225         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4226         if (p->arg.open_seqid == NULL)
4227                 goto out_free;
4228         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4229         if (p->arg.lock_seqid == NULL)
4230                 goto out_free_seqid;
4231         p->arg.lock_stateid = &lsp->ls_stateid;
4232         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4233         p->arg.lock_owner.id = lsp->ls_id.id;
4234         p->arg.lock_owner.s_dev = server->s_dev;
4235         p->res.lock_seqid = p->arg.lock_seqid;
4236         p->lsp = lsp;
4237         p->server = server;
4238         atomic_inc(&lsp->ls_count);
4239         p->ctx = get_nfs_open_context(ctx);
4240         memcpy(&p->fl, fl, sizeof(p->fl));
4241         return p;
4242 out_free_seqid:
4243         nfs_free_seqid(p->arg.open_seqid);
4244 out_free:
4245         kfree(p);
4246         return NULL;
4247 }
4248
4249 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4250 {
4251         struct nfs4_lockdata *data = calldata;
4252         struct nfs4_state *state = data->lsp->ls_state;
4253
4254         dprintk("%s: begin!\n", __func__);
4255         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4256                 return;
4257         /* Do we need to do an open_to_lock_owner? */
4258         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4259                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4260                         return;
4261                 data->arg.open_stateid = &state->stateid;
4262                 data->arg.new_lock_owner = 1;
4263                 data->res.open_seqid = data->arg.open_seqid;
4264         } else
4265                 data->arg.new_lock_owner = 0;
4266         data->timestamp = jiffies;
4267         if (nfs4_setup_sequence(data->server,
4268                                 &data->arg.seq_args,
4269                                 &data->res.seq_res, 1, task))
4270                 return;
4271         rpc_call_start(task);
4272         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4273 }
4274
4275 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4276 {
4277         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4278         nfs4_lock_prepare(task, calldata);
4279 }
4280
4281 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4282 {
4283         struct nfs4_lockdata *data = calldata;
4284
4285         dprintk("%s: begin!\n", __func__);
4286
4287         if (!nfs4_sequence_done(task, &data->res.seq_res))
4288                 return;
4289
4290         data->rpc_status = task->tk_status;
4291         if (data->arg.new_lock_owner != 0) {
4292                 if (data->rpc_status == 0)
4293                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4294                 else
4295                         goto out;
4296         }
4297         if (data->rpc_status == 0) {
4298                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4299                                         sizeof(data->lsp->ls_stateid.data));
4300                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4301                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4302         }
4303 out:
4304         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4305 }
4306
4307 static void nfs4_lock_release(void *calldata)
4308 {
4309         struct nfs4_lockdata *data = calldata;
4310
4311         dprintk("%s: begin!\n", __func__);
4312         nfs_free_seqid(data->arg.open_seqid);
4313         if (data->cancelled != 0) {
4314                 struct rpc_task *task;
4315                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4316                                 data->arg.lock_seqid);
4317                 if (!IS_ERR(task))
4318                         rpc_put_task_async(task);
4319                 dprintk("%s: cancelling lock!\n", __func__);
4320         } else
4321                 nfs_free_seqid(data->arg.lock_seqid);
4322         nfs4_put_lock_state(data->lsp);
4323         put_nfs_open_context(data->ctx);
4324         kfree(data);
4325         dprintk("%s: done!\n", __func__);
4326 }
4327
4328 static const struct rpc_call_ops nfs4_lock_ops = {
4329         .rpc_call_prepare = nfs4_lock_prepare,
4330         .rpc_call_done = nfs4_lock_done,
4331         .rpc_release = nfs4_lock_release,
4332 };
4333
4334 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4335         .rpc_call_prepare = nfs4_recover_lock_prepare,
4336         .rpc_call_done = nfs4_lock_done,
4337         .rpc_release = nfs4_lock_release,
4338 };
4339
4340 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4341 {
4342         switch (error) {
4343         case -NFS4ERR_ADMIN_REVOKED:
4344         case -NFS4ERR_BAD_STATEID:
4345                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4346                 if (new_lock_owner != 0 ||
4347                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4348                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4349                 break;
4350         case -NFS4ERR_STALE_STATEID:
4351                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4352         case -NFS4ERR_EXPIRED:
4353                 nfs4_schedule_lease_recovery(server->nfs_client);
4354         };
4355 }
4356
4357 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4358 {
4359         struct nfs4_lockdata *data;
4360         struct rpc_task *task;
4361         struct rpc_message msg = {
4362                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4363                 .rpc_cred = state->owner->so_cred,
4364         };
4365         struct rpc_task_setup task_setup_data = {
4366                 .rpc_client = NFS_CLIENT(state->inode),
4367                 .rpc_message = &msg,
4368                 .callback_ops = &nfs4_lock_ops,
4369                 .workqueue = nfsiod_workqueue,
4370                 .flags = RPC_TASK_ASYNC,
4371         };
4372         int ret;
4373
4374         dprintk("%s: begin!\n", __func__);
4375         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4376                         fl->fl_u.nfs4_fl.owner,
4377                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4378         if (data == NULL)
4379                 return -ENOMEM;
4380         if (IS_SETLKW(cmd))
4381                 data->arg.block = 1;
4382         if (recovery_type > NFS_LOCK_NEW) {
4383                 if (recovery_type == NFS_LOCK_RECLAIM)
4384                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4385                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4386         }
4387         msg.rpc_argp = &data->arg;
4388         msg.rpc_resp = &data->res;
4389         task_setup_data.callback_data = data;
4390         task = rpc_run_task(&task_setup_data);
4391         if (IS_ERR(task))
4392                 return PTR_ERR(task);
4393         ret = nfs4_wait_for_completion_rpc_task(task);
4394         if (ret == 0) {
4395                 ret = data->rpc_status;
4396                 if (ret)
4397                         nfs4_handle_setlk_error(data->server, data->lsp,
4398                                         data->arg.new_lock_owner, ret);
4399         } else
4400                 data->cancelled = 1;
4401         rpc_put_task(task);
4402         dprintk("%s: done, ret = %d!\n", __func__, ret);
4403         return ret;
4404 }
4405
4406 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4407 {
4408         struct nfs_server *server = NFS_SERVER(state->inode);
4409         struct nfs4_exception exception = { };
4410         int err;
4411
4412         do {
4413                 /* Cache the lock if possible... */
4414                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4415                         return 0;
4416                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4417                 if (err != -NFS4ERR_DELAY)
4418                         break;
4419                 nfs4_handle_exception(server, err, &exception);
4420         } while (exception.retry);
4421         return err;
4422 }
4423
4424 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4425 {
4426         struct nfs_server *server = NFS_SERVER(state->inode);
4427         struct nfs4_exception exception = { };
4428         int err;
4429
4430         err = nfs4_set_lock_state(state, request);
4431         if (err != 0)
4432                 return err;
4433         do {
4434                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4435                         return 0;
4436                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4437                 switch (err) {
4438                 default:
4439                         goto out;
4440                 case -NFS4ERR_GRACE:
4441                 case -NFS4ERR_DELAY:
4442                         nfs4_handle_exception(server, err, &exception);
4443                         err = 0;
4444                 }
4445         } while (exception.retry);
4446 out:
4447         return err;
4448 }
4449
4450 #if defined(CONFIG_NFS_V4_1)
4451 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4452 {
4453         int status;
4454         struct nfs_server *server = NFS_SERVER(state->inode);
4455
4456         status = nfs41_test_stateid(server, state);
4457         if (status == NFS_OK)
4458                 return 0;
4459         nfs41_free_stateid(server, state);
4460         return nfs4_lock_expired(state, request);
4461 }
4462 #endif
4463
4464 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4465 {
4466         struct nfs_inode *nfsi = NFS_I(state->inode);
4467         unsigned char fl_flags = request->fl_flags;
4468         int status = -ENOLCK;
4469
4470         if ((fl_flags & FL_POSIX) &&
4471                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4472                 goto out;
4473         /* Is this a delegated open? */
4474         status = nfs4_set_lock_state(state, request);
4475         if (status != 0)
4476                 goto out;
4477         request->fl_flags |= FL_ACCESS;
4478         status = do_vfs_lock(request->fl_file, request);
4479         if (status < 0)
4480                 goto out;
4481         down_read(&nfsi->rwsem);
4482         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4483                 /* Yes: cache locks! */
4484                 /* ...but avoid races with delegation recall... */
4485                 request->fl_flags = fl_flags & ~FL_SLEEP;
4486                 status = do_vfs_lock(request->fl_file, request);
4487                 goto out_unlock;
4488         }
4489         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4490         if (status != 0)
4491                 goto out_unlock;
4492         /* Note: we always want to sleep here! */
4493         request->fl_flags = fl_flags | FL_SLEEP;
4494         if (do_vfs_lock(request->fl_file, request) < 0)
4495                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4496 out_unlock:
4497         up_read(&nfsi->rwsem);
4498 out:
4499         request->fl_flags = fl_flags;
4500         return status;
4501 }
4502
4503 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4504 {
4505         struct nfs4_exception exception = { };
4506         int err;
4507
4508         do {
4509                 err = _nfs4_proc_setlk(state, cmd, request);
4510                 if (err == -NFS4ERR_DENIED)
4511                         err = -EAGAIN;
4512                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4513                                 err, &exception);
4514         } while (exception.retry);
4515         return err;
4516 }
4517
4518 static int
4519 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4520 {
4521         struct nfs_open_context *ctx;
4522         struct nfs4_state *state;
4523         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4524         int status;
4525
4526         /* verify open state */
4527         ctx = nfs_file_open_context(filp);
4528         state = ctx->state;
4529
4530         if (request->fl_start < 0 || request->fl_end < 0)
4531                 return -EINVAL;
4532
4533         if (IS_GETLK(cmd)) {
4534                 if (state != NULL)
4535                         return nfs4_proc_getlk(state, F_GETLK, request);
4536                 return 0;
4537         }
4538
4539         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4540                 return -EINVAL;
4541
4542         if (request->fl_type == F_UNLCK) {
4543                 if (state != NULL)
4544                         return nfs4_proc_unlck(state, cmd, request);
4545                 return 0;
4546         }
4547
4548         if (state == NULL)
4549                 return -ENOLCK;
4550         do {
4551                 status = nfs4_proc_setlk(state, cmd, request);
4552                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4553                         break;
4554                 timeout = nfs4_set_lock_task_retry(timeout);
4555                 status = -ERESTARTSYS;
4556                 if (signalled())
4557                         break;
4558         } while(status < 0);
4559         return status;
4560 }
4561
4562 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4563 {
4564         struct nfs_server *server = NFS_SERVER(state->inode);
4565         struct nfs4_exception exception = { };
4566         int err;
4567
4568         err = nfs4_set_lock_state(state, fl);
4569         if (err != 0)
4570                 goto out;
4571         do {
4572                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4573                 switch (err) {
4574                         default:
4575                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4576                                                 __func__, err);
4577                         case 0:
4578                         case -ESTALE:
4579                                 goto out;
4580                         case -NFS4ERR_EXPIRED:
4581                                 nfs4_schedule_stateid_recovery(server, state);
4582                         case -NFS4ERR_STALE_CLIENTID:
4583                         case -NFS4ERR_STALE_STATEID:
4584                                 nfs4_schedule_lease_recovery(server->nfs_client);
4585                                 goto out;
4586                         case -NFS4ERR_BADSESSION:
4587                         case -NFS4ERR_BADSLOT:
4588                         case -NFS4ERR_BAD_HIGH_SLOT:
4589                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4590                         case -NFS4ERR_DEADSESSION:
4591                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4592                                 goto out;
4593                         case -ERESTARTSYS:
4594                                 /*
4595                                  * The show must go on: exit, but mark the
4596                                  * stateid as needing recovery.
4597                                  */
4598                         case -NFS4ERR_ADMIN_REVOKED:
4599                         case -NFS4ERR_BAD_STATEID:
4600                         case -NFS4ERR_OPENMODE:
4601                                 nfs4_schedule_stateid_recovery(server, state);
4602                                 err = 0;
4603                                 goto out;
4604                         case -EKEYEXPIRED:
4605                                 /*
4606                                  * User RPCSEC_GSS context has expired.
4607                                  * We cannot recover this stateid now, so
4608                                  * skip it and allow recovery thread to
4609                                  * proceed.
4610                                  */
4611                                 err = 0;
4612                                 goto out;
4613                         case -ENOMEM:
4614                         case -NFS4ERR_DENIED:
4615                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4616                                 err = 0;
4617                                 goto out;
4618                         case -NFS4ERR_DELAY:
4619                                 break;
4620                 }
4621                 err = nfs4_handle_exception(server, err, &exception);
4622         } while (exception.retry);
4623 out:
4624         return err;
4625 }
4626
4627 static void nfs4_release_lockowner_release(void *calldata)
4628 {
4629         kfree(calldata);
4630 }
4631
4632 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4633         .rpc_release = nfs4_release_lockowner_release,
4634 };
4635
4636 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4637 {
4638         struct nfs_server *server = lsp->ls_state->owner->so_server;
4639         struct nfs_release_lockowner_args *args;
4640         struct rpc_message msg = {
4641                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4642         };
4643
4644         if (server->nfs_client->cl_mvops->minor_version != 0)
4645                 return;
4646         args = kmalloc(sizeof(*args), GFP_NOFS);
4647         if (!args)
4648                 return;
4649         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4650         args->lock_owner.id = lsp->ls_id.id;
4651         args->lock_owner.s_dev = server->s_dev;
4652         msg.rpc_argp = args;
4653         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4654 }
4655
4656 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4657
4658 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4659                                    const void *buf, size_t buflen,
4660                                    int flags, int type)
4661 {
4662         if (strcmp(key, "") != 0)
4663                 return -EINVAL;
4664
4665         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4666 }
4667
4668 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4669                                    void *buf, size_t buflen, int type)
4670 {
4671         if (strcmp(key, "") != 0)
4672                 return -EINVAL;
4673
4674         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4675 }
4676
4677 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4678                                        size_t list_len, const char *name,
4679                                        size_t name_len, int type)
4680 {
4681         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4682
4683         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4684                 return 0;
4685
4686         if (list && len <= list_len)
4687                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4688         return len;
4689 }
4690
4691 /*
4692  * nfs_fhget will use either the mounted_on_fileid or the fileid
4693  */
4694 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4695 {
4696         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4697                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4698               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4699               (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4700                 return;
4701
4702         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4703                 NFS_ATTR_FATTR_NLINK;
4704         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4705         fattr->nlink = 2;
4706 }
4707
4708 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4709                 struct nfs4_fs_locations *fs_locations, struct page *page)
4710 {
4711         struct nfs_server *server = NFS_SERVER(dir);
4712         u32 bitmask[2] = {
4713                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4714         };
4715         struct nfs4_fs_locations_arg args = {
4716                 .dir_fh = NFS_FH(dir),
4717                 .name = name,
4718                 .page = page,
4719                 .bitmask = bitmask,
4720         };
4721         struct nfs4_fs_locations_res res = {
4722                 .fs_locations = fs_locations,
4723         };
4724         struct rpc_message msg = {
4725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4726                 .rpc_argp = &args,
4727                 .rpc_resp = &res,
4728         };
4729         int status;
4730
4731         dprintk("%s: start\n", __func__);
4732
4733         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4734          * is not supported */
4735         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
4736                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
4737         else
4738                 bitmask[0] |= FATTR4_WORD0_FILEID;
4739
4740         nfs_fattr_init(&fs_locations->fattr);
4741         fs_locations->server = server;
4742         fs_locations->nlocations = 0;
4743         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4744         dprintk("%s: returned status = %d\n", __func__, status);
4745         return status;
4746 }
4747
4748 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4749 {
4750         int status;
4751         struct nfs4_secinfo_arg args = {
4752                 .dir_fh = NFS_FH(dir),
4753                 .name   = name,
4754         };
4755         struct nfs4_secinfo_res res = {
4756                 .flavors     = flavors,
4757         };
4758         struct rpc_message msg = {
4759                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
4760                 .rpc_argp = &args,
4761                 .rpc_resp = &res,
4762         };
4763
4764         dprintk("NFS call  secinfo %s\n", name->name);
4765         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4766         dprintk("NFS reply  secinfo: %d\n", status);
4767         return status;
4768 }
4769
4770 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
4771 {
4772         struct nfs4_exception exception = { };
4773         int err;
4774         do {
4775                 err = nfs4_handle_exception(NFS_SERVER(dir),
4776                                 _nfs4_proc_secinfo(dir, name, flavors),
4777                                 &exception);
4778         } while (exception.retry);
4779         return err;
4780 }
4781
4782 #ifdef CONFIG_NFS_V4_1
4783 /*
4784  * Check the exchange flags returned by the server for invalid flags, having
4785  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4786  * DS flags set.
4787  */
4788 static int nfs4_check_cl_exchange_flags(u32 flags)
4789 {
4790         if (flags & ~EXCHGID4_FLAG_MASK_R)
4791                 goto out_inval;
4792         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4793             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4794                 goto out_inval;
4795         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4796                 goto out_inval;
4797         return NFS_OK;
4798 out_inval:
4799         return -NFS4ERR_INVAL;
4800 }
4801
4802 static bool
4803 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
4804 {
4805         if (a->server_scope_sz == b->server_scope_sz &&
4806             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
4807                 return true;
4808
4809         return false;
4810 }
4811
4812 /*
4813  * nfs4_proc_exchange_id()
4814  *
4815  * Since the clientid has expired, all compounds using sessions
4816  * associated with the stale clientid will be returning
4817  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4818  * be in some phase of session reset.
4819  */
4820 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4821 {
4822         nfs4_verifier verifier;
4823         struct nfs41_exchange_id_args args = {
4824                 .client = clp,
4825                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4826         };
4827         struct nfs41_exchange_id_res res = {
4828                 .client = clp,
4829         };
4830         int status;
4831         struct rpc_message msg = {
4832                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4833                 .rpc_argp = &args,
4834                 .rpc_resp = &res,
4835                 .rpc_cred = cred,
4836         };
4837         __be32 *p;
4838
4839         dprintk("--> %s\n", __func__);
4840         BUG_ON(clp == NULL);
4841
4842         p = (u32 *)verifier.data;
4843         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4844         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4845         args.verifier = &verifier;
4846
4847         args.id_len = scnprintf(args.id, sizeof(args.id),
4848                                 "%s/%s.%s/%u",
4849                                 clp->cl_ipaddr,
4850                                 init_utsname()->nodename,
4851                                 init_utsname()->domainname,
4852                                 clp->cl_rpcclient->cl_auth->au_flavor);
4853
4854         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
4855         if (unlikely(!res.server_scope))
4856                 return -ENOMEM;
4857
4858         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4859         if (!status)
4860                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4861
4862         if (!status) {
4863                 if (clp->server_scope &&
4864                     !nfs41_same_server_scope(clp->server_scope,
4865                                              res.server_scope)) {
4866                         dprintk("%s: server_scope mismatch detected\n",
4867                                 __func__);
4868                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
4869                         kfree(clp->server_scope);
4870                         clp->server_scope = NULL;
4871                 }
4872
4873                 if (!clp->server_scope)
4874                         clp->server_scope = res.server_scope;
4875                 else
4876                         kfree(res.server_scope);
4877         }
4878
4879         dprintk("<-- %s status= %d\n", __func__, status);
4880         return status;
4881 }
4882
4883 struct nfs4_get_lease_time_data {
4884         struct nfs4_get_lease_time_args *args;
4885         struct nfs4_get_lease_time_res *res;
4886         struct nfs_client *clp;
4887 };
4888
4889 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4890                                         void *calldata)
4891 {
4892         int ret;
4893         struct nfs4_get_lease_time_data *data =
4894                         (struct nfs4_get_lease_time_data *)calldata;
4895
4896         dprintk("--> %s\n", __func__);
4897         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4898         /* just setup sequence, do not trigger session recovery
4899            since we're invoked within one */
4900         ret = nfs41_setup_sequence(data->clp->cl_session,
4901                                    &data->args->la_seq_args,
4902                                    &data->res->lr_seq_res, 0, task);
4903
4904         BUG_ON(ret == -EAGAIN);
4905         rpc_call_start(task);
4906         dprintk("<-- %s\n", __func__);
4907 }
4908
4909 /*
4910  * Called from nfs4_state_manager thread for session setup, so don't recover
4911  * from sequence operation or clientid errors.
4912  */
4913 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4914 {
4915         struct nfs4_get_lease_time_data *data =
4916                         (struct nfs4_get_lease_time_data *)calldata;
4917
4918         dprintk("--> %s\n", __func__);
4919         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4920                 return;
4921         switch (task->tk_status) {
4922         case -NFS4ERR_DELAY:
4923         case -NFS4ERR_GRACE:
4924                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4925                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4926                 task->tk_status = 0;
4927                 /* fall through */
4928         case -NFS4ERR_RETRY_UNCACHED_REP:
4929                 nfs_restart_rpc(task, data->clp);
4930                 return;
4931         }
4932         dprintk("<-- %s\n", __func__);
4933 }
4934
4935 struct rpc_call_ops nfs4_get_lease_time_ops = {
4936         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4937         .rpc_call_done = nfs4_get_lease_time_done,
4938 };
4939
4940 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4941 {
4942         struct rpc_task *task;
4943         struct nfs4_get_lease_time_args args;
4944         struct nfs4_get_lease_time_res res = {
4945                 .lr_fsinfo = fsinfo,
4946         };
4947         struct nfs4_get_lease_time_data data = {
4948                 .args = &args,
4949                 .res = &res,
4950                 .clp = clp,
4951         };
4952         struct rpc_message msg = {
4953                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4954                 .rpc_argp = &args,
4955                 .rpc_resp = &res,
4956         };
4957         struct rpc_task_setup task_setup = {
4958                 .rpc_client = clp->cl_rpcclient,
4959                 .rpc_message = &msg,
4960                 .callback_ops = &nfs4_get_lease_time_ops,
4961                 .callback_data = &data,
4962                 .flags = RPC_TASK_TIMEOUT,
4963         };
4964         int status;
4965
4966         dprintk("--> %s\n", __func__);
4967         task = rpc_run_task(&task_setup);
4968
4969         if (IS_ERR(task))
4970                 status = PTR_ERR(task);
4971         else {
4972                 status = task->tk_status;
4973                 rpc_put_task(task);
4974         }
4975         dprintk("<-- %s return %d\n", __func__, status);
4976
4977         return status;
4978 }
4979
4980 /*
4981  * Reset a slot table
4982  */
4983 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4984                                  int ivalue)
4985 {
4986         struct nfs4_slot *new = NULL;
4987         int i;
4988         int ret = 0;
4989
4990         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4991                 max_reqs, tbl->max_slots);
4992
4993         /* Does the newly negotiated max_reqs match the existing slot table? */
4994         if (max_reqs != tbl->max_slots) {
4995                 ret = -ENOMEM;
4996                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4997                               GFP_NOFS);
4998                 if (!new)
4999                         goto out;
5000                 ret = 0;
5001                 kfree(tbl->slots);
5002         }
5003         spin_lock(&tbl->slot_tbl_lock);
5004         if (new) {
5005                 tbl->slots = new;
5006                 tbl->max_slots = max_reqs;
5007         }
5008         for (i = 0; i < tbl->max_slots; ++i)
5009                 tbl->slots[i].seq_nr = ivalue;
5010         spin_unlock(&tbl->slot_tbl_lock);
5011         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5012                 tbl, tbl->slots, tbl->max_slots);
5013 out:
5014         dprintk("<-- %s: return %d\n", __func__, ret);
5015         return ret;
5016 }
5017
5018 /*
5019  * Reset the forechannel and backchannel slot tables
5020  */
5021 static int nfs4_reset_slot_tables(struct nfs4_session *session)
5022 {
5023         int status;
5024
5025         status = nfs4_reset_slot_table(&session->fc_slot_table,
5026                         session->fc_attrs.max_reqs, 1);
5027         if (status)
5028                 return status;
5029
5030         status = nfs4_reset_slot_table(&session->bc_slot_table,
5031                         session->bc_attrs.max_reqs, 0);
5032         return status;
5033 }
5034
5035 /* Destroy the slot table */
5036 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5037 {
5038         if (session->fc_slot_table.slots != NULL) {
5039                 kfree(session->fc_slot_table.slots);
5040                 session->fc_slot_table.slots = NULL;
5041         }
5042         if (session->bc_slot_table.slots != NULL) {
5043                 kfree(session->bc_slot_table.slots);
5044                 session->bc_slot_table.slots = NULL;
5045         }
5046         return;
5047 }
5048
5049 /*
5050  * Initialize slot table
5051  */
5052 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
5053                 int max_slots, int ivalue)
5054 {
5055         struct nfs4_slot *slot;
5056         int ret = -ENOMEM;
5057
5058         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
5059
5060         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
5061
5062         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
5063         if (!slot)
5064                 goto out;
5065         ret = 0;
5066
5067         spin_lock(&tbl->slot_tbl_lock);
5068         tbl->max_slots = max_slots;
5069         tbl->slots = slot;
5070         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5071         spin_unlock(&tbl->slot_tbl_lock);
5072         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5073                 tbl, tbl->slots, tbl->max_slots);
5074 out:
5075         dprintk("<-- %s: return %d\n", __func__, ret);
5076         return ret;
5077 }
5078
5079 /*
5080  * Initialize the forechannel and backchannel tables
5081  */
5082 static int nfs4_init_slot_tables(struct nfs4_session *session)
5083 {
5084         struct nfs4_slot_table *tbl;
5085         int status = 0;
5086
5087         tbl = &session->fc_slot_table;
5088         if (tbl->slots == NULL) {
5089                 status = nfs4_init_slot_table(tbl,
5090                                 session->fc_attrs.max_reqs, 1);
5091                 if (status)
5092                         return status;
5093         }
5094
5095         tbl = &session->bc_slot_table;
5096         if (tbl->slots == NULL) {
5097                 status = nfs4_init_slot_table(tbl,
5098                                 session->bc_attrs.max_reqs, 0);
5099                 if (status)
5100                         nfs4_destroy_slot_tables(session);
5101         }
5102
5103         return status;
5104 }
5105
5106 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5107 {
5108         struct nfs4_session *session;
5109         struct nfs4_slot_table *tbl;
5110
5111         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5112         if (!session)
5113                 return NULL;
5114
5115         tbl = &session->fc_slot_table;
5116         tbl->highest_used_slotid = -1;
5117         spin_lock_init(&tbl->slot_tbl_lock);
5118         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5119         init_completion(&tbl->complete);
5120
5121         tbl = &session->bc_slot_table;
5122         tbl->highest_used_slotid = -1;
5123         spin_lock_init(&tbl->slot_tbl_lock);
5124         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5125         init_completion(&tbl->complete);
5126
5127         session->session_state = 1<<NFS4_SESSION_INITING;
5128
5129         session->clp = clp;
5130         return session;
5131 }
5132
5133 void nfs4_destroy_session(struct nfs4_session *session)
5134 {
5135         nfs4_proc_destroy_session(session);
5136         dprintk("%s Destroy backchannel for xprt %p\n",
5137                 __func__, session->clp->cl_rpcclient->cl_xprt);
5138         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
5139                                 NFS41_BC_MIN_CALLBACKS);
5140         nfs4_destroy_slot_tables(session);
5141         kfree(session);
5142 }
5143
5144 /*
5145  * Initialize the values to be used by the client in CREATE_SESSION
5146  * If nfs4_init_session set the fore channel request and response sizes,
5147  * use them.
5148  *
5149  * Set the back channel max_resp_sz_cached to zero to force the client to
5150  * always set csa_cachethis to FALSE because the current implementation
5151  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5152  */
5153 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5154 {
5155         struct nfs4_session *session = args->client->cl_session;
5156         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5157                      mxresp_sz = session->fc_attrs.max_resp_sz;
5158
5159         if (mxrqst_sz == 0)
5160                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5161         if (mxresp_sz == 0)
5162                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5163         /* Fore channel attributes */
5164         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5165         args->fc_attrs.max_resp_sz = mxresp_sz;
5166         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5167         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
5168
5169         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5170                 "max_ops=%u max_reqs=%u\n",
5171                 __func__,
5172                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5173                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5174
5175         /* Back channel attributes */
5176         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5177         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5178         args->bc_attrs.max_resp_sz_cached = 0;
5179         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5180         args->bc_attrs.max_reqs = 1;
5181
5182         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5183                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5184                 __func__,
5185                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5186                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5187                 args->bc_attrs.max_reqs);
5188 }
5189
5190 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5191 {
5192         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5193         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5194
5195         if (rcvd->max_resp_sz > sent->max_resp_sz)
5196                 return -EINVAL;
5197         /*
5198          * Our requested max_ops is the minimum we need; we're not
5199          * prepared to break up compounds into smaller pieces than that.
5200          * So, no point even trying to continue if the server won't
5201          * cooperate:
5202          */
5203         if (rcvd->max_ops < sent->max_ops)
5204                 return -EINVAL;
5205         if (rcvd->max_reqs == 0)
5206                 return -EINVAL;
5207         return 0;
5208 }
5209
5210 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5211 {
5212         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5213         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5214
5215         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5216                 return -EINVAL;
5217         if (rcvd->max_resp_sz < sent->max_resp_sz)
5218                 return -EINVAL;
5219         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5220                 return -EINVAL;
5221         /* These would render the backchannel useless: */
5222         if (rcvd->max_ops  == 0)
5223                 return -EINVAL;
5224         if (rcvd->max_reqs == 0)
5225                 return -EINVAL;
5226         return 0;
5227 }
5228
5229 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5230                                      struct nfs4_session *session)
5231 {
5232         int ret;
5233
5234         ret = nfs4_verify_fore_channel_attrs(args, session);
5235         if (ret)
5236                 return ret;
5237         return nfs4_verify_back_channel_attrs(args, session);
5238 }
5239
5240 static int _nfs4_proc_create_session(struct nfs_client *clp)
5241 {
5242         struct nfs4_session *session = clp->cl_session;
5243         struct nfs41_create_session_args args = {
5244                 .client = clp,
5245                 .cb_program = NFS4_CALLBACK,
5246         };
5247         struct nfs41_create_session_res res = {
5248                 .client = clp,
5249         };
5250         struct rpc_message msg = {
5251                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5252                 .rpc_argp = &args,
5253                 .rpc_resp = &res,
5254         };
5255         int status;
5256
5257         nfs4_init_channel_attrs(&args);
5258         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5259
5260         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5261
5262         if (!status)
5263                 /* Verify the session's negotiated channel_attrs values */
5264                 status = nfs4_verify_channel_attrs(&args, session);
5265         if (!status) {
5266                 /* Increment the clientid slot sequence id */
5267                 clp->cl_seqid++;
5268         }
5269
5270         return status;
5271 }
5272
5273 /*
5274  * Issues a CREATE_SESSION operation to the server.
5275  * It is the responsibility of the caller to verify the session is
5276  * expired before calling this routine.
5277  */
5278 int nfs4_proc_create_session(struct nfs_client *clp)
5279 {
5280         int status;
5281         unsigned *ptr;
5282         struct nfs4_session *session = clp->cl_session;
5283
5284         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5285
5286         status = _nfs4_proc_create_session(clp);
5287         if (status)
5288                 goto out;
5289
5290         /* Init and reset the fore channel */
5291         status = nfs4_init_slot_tables(session);
5292         dprintk("slot table initialization returned %d\n", status);
5293         if (status)
5294                 goto out;
5295         status = nfs4_reset_slot_tables(session);
5296         dprintk("slot table reset returned %d\n", status);
5297         if (status)
5298                 goto out;
5299
5300         ptr = (unsigned *)&session->sess_id.data[0];
5301         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5302                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5303 out:
5304         dprintk("<-- %s\n", __func__);
5305         return status;
5306 }
5307
5308 /*
5309  * Issue the over-the-wire RPC DESTROY_SESSION.
5310  * The caller must serialize access to this routine.
5311  */
5312 int nfs4_proc_destroy_session(struct nfs4_session *session)
5313 {
5314         int status = 0;
5315         struct rpc_message msg;
5316
5317         dprintk("--> nfs4_proc_destroy_session\n");
5318
5319         /* session is still being setup */
5320         if (session->clp->cl_cons_state != NFS_CS_READY)
5321                 return status;
5322
5323         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5324         msg.rpc_argp = session;
5325         msg.rpc_resp = NULL;
5326         msg.rpc_cred = NULL;
5327         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5328
5329         if (status)
5330                 printk(KERN_WARNING
5331                         "Got error %d from the server on DESTROY_SESSION. "
5332                         "Session has been destroyed regardless...\n", status);
5333
5334         dprintk("<-- nfs4_proc_destroy_session\n");
5335         return status;
5336 }
5337
5338 int nfs4_init_session(struct nfs_server *server)
5339 {
5340         struct nfs_client *clp = server->nfs_client;
5341         struct nfs4_session *session;
5342         unsigned int rsize, wsize;
5343         int ret;
5344
5345         if (!nfs4_has_session(clp))
5346                 return 0;
5347
5348         session = clp->cl_session;
5349         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5350                 return 0;
5351
5352         rsize = server->rsize;
5353         if (rsize == 0)
5354                 rsize = NFS_MAX_FILE_IO_SIZE;
5355         wsize = server->wsize;
5356         if (wsize == 0)
5357                 wsize = NFS_MAX_FILE_IO_SIZE;
5358
5359         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5360         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5361
5362         ret = nfs4_recover_expired_lease(server);
5363         if (!ret)
5364                 ret = nfs4_check_client_ready(clp);
5365         return ret;
5366 }
5367
5368 int nfs4_init_ds_session(struct nfs_client *clp)
5369 {
5370         struct nfs4_session *session = clp->cl_session;
5371         int ret;
5372
5373         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5374                 return 0;
5375
5376         ret = nfs4_client_recover_expired_lease(clp);
5377         if (!ret)
5378                 /* Test for the DS role */
5379                 if (!is_ds_client(clp))
5380                         ret = -ENODEV;
5381         if (!ret)
5382                 ret = nfs4_check_client_ready(clp);
5383         return ret;
5384
5385 }
5386 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5387
5388
5389 /*
5390  * Renew the cl_session lease.
5391  */
5392 struct nfs4_sequence_data {
5393         struct nfs_client *clp;
5394         struct nfs4_sequence_args args;
5395         struct nfs4_sequence_res res;
5396 };
5397
5398 static void nfs41_sequence_release(void *data)
5399 {
5400         struct nfs4_sequence_data *calldata = data;
5401         struct nfs_client *clp = calldata->clp;
5402
5403         if (atomic_read(&clp->cl_count) > 1)
5404                 nfs4_schedule_state_renewal(clp);
5405         nfs_put_client(clp);
5406         kfree(calldata);
5407 }
5408
5409 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5410 {
5411         switch(task->tk_status) {
5412         case -NFS4ERR_DELAY:
5413                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5414                 return -EAGAIN;
5415         default:
5416                 nfs4_schedule_lease_recovery(clp);
5417         }
5418         return 0;
5419 }
5420
5421 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5422 {
5423         struct nfs4_sequence_data *calldata = data;
5424         struct nfs_client *clp = calldata->clp;
5425
5426         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5427                 return;
5428
5429         if (task->tk_status < 0) {
5430                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5431                 if (atomic_read(&clp->cl_count) == 1)
5432                         goto out;
5433
5434                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5435                         rpc_restart_call_prepare(task);
5436                         return;
5437                 }
5438         }
5439         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5440 out:
5441         dprintk("<-- %s\n", __func__);
5442 }
5443
5444 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5445 {
5446         struct nfs4_sequence_data *calldata = data;
5447         struct nfs_client *clp = calldata->clp;
5448         struct nfs4_sequence_args *args;
5449         struct nfs4_sequence_res *res;
5450
5451         args = task->tk_msg.rpc_argp;
5452         res = task->tk_msg.rpc_resp;
5453
5454         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5455                 return;
5456         rpc_call_start(task);
5457 }
5458
5459 static const struct rpc_call_ops nfs41_sequence_ops = {
5460         .rpc_call_done = nfs41_sequence_call_done,
5461         .rpc_call_prepare = nfs41_sequence_prepare,
5462         .rpc_release = nfs41_sequence_release,
5463 };
5464
5465 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5466 {
5467         struct nfs4_sequence_data *calldata;
5468         struct rpc_message msg = {
5469                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5470                 .rpc_cred = cred,
5471         };
5472         struct rpc_task_setup task_setup_data = {
5473                 .rpc_client = clp->cl_rpcclient,
5474                 .rpc_message = &msg,
5475                 .callback_ops = &nfs41_sequence_ops,
5476                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5477         };
5478
5479         if (!atomic_inc_not_zero(&clp->cl_count))
5480                 return ERR_PTR(-EIO);
5481         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5482         if (calldata == NULL) {
5483                 nfs_put_client(clp);
5484                 return ERR_PTR(-ENOMEM);
5485         }
5486         msg.rpc_argp = &calldata->args;
5487         msg.rpc_resp = &calldata->res;
5488         calldata->clp = clp;
5489         task_setup_data.callback_data = calldata;
5490
5491         return rpc_run_task(&task_setup_data);
5492 }
5493
5494 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5495 {
5496         struct rpc_task *task;
5497         int ret = 0;
5498
5499         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5500                 return 0;
5501         task = _nfs41_proc_sequence(clp, cred);
5502         if (IS_ERR(task))
5503                 ret = PTR_ERR(task);
5504         else
5505                 rpc_put_task_async(task);
5506         dprintk("<-- %s status=%d\n", __func__, ret);
5507         return ret;
5508 }
5509
5510 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5511 {
5512         struct rpc_task *task;
5513         int ret;
5514
5515         task = _nfs41_proc_sequence(clp, cred);
5516         if (IS_ERR(task)) {
5517                 ret = PTR_ERR(task);
5518                 goto out;
5519         }
5520         ret = rpc_wait_for_completion_task(task);
5521         if (!ret) {
5522                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5523
5524                 if (task->tk_status == 0)
5525                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5526                 ret = task->tk_status;
5527         }
5528         rpc_put_task(task);
5529 out:
5530         dprintk("<-- %s status=%d\n", __func__, ret);
5531         return ret;
5532 }
5533
5534 struct nfs4_reclaim_complete_data {
5535         struct nfs_client *clp;
5536         struct nfs41_reclaim_complete_args arg;
5537         struct nfs41_reclaim_complete_res res;
5538 };
5539
5540 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5541 {
5542         struct nfs4_reclaim_complete_data *calldata = data;
5543
5544         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5545         if (nfs41_setup_sequence(calldata->clp->cl_session,
5546                                 &calldata->arg.seq_args,
5547                                 &calldata->res.seq_res, 0, task))
5548                 return;
5549
5550         rpc_call_start(task);
5551 }
5552
5553 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5554 {
5555         switch(task->tk_status) {
5556         case 0:
5557         case -NFS4ERR_COMPLETE_ALREADY:
5558         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5559                 break;
5560         case -NFS4ERR_DELAY:
5561                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5562                 /* fall through */
5563         case -NFS4ERR_RETRY_UNCACHED_REP:
5564                 return -EAGAIN;
5565         default:
5566                 nfs4_schedule_lease_recovery(clp);
5567         }
5568         return 0;
5569 }
5570
5571 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5572 {
5573         struct nfs4_reclaim_complete_data *calldata = data;
5574         struct nfs_client *clp = calldata->clp;
5575         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5576
5577         dprintk("--> %s\n", __func__);
5578         if (!nfs41_sequence_done(task, res))
5579                 return;
5580
5581         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5582                 rpc_restart_call_prepare(task);
5583                 return;
5584         }
5585         dprintk("<-- %s\n", __func__);
5586 }
5587
5588 static void nfs4_free_reclaim_complete_data(void *data)
5589 {
5590         struct nfs4_reclaim_complete_data *calldata = data;
5591
5592         kfree(calldata);
5593 }
5594
5595 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5596         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5597         .rpc_call_done = nfs4_reclaim_complete_done,
5598         .rpc_release = nfs4_free_reclaim_complete_data,
5599 };
5600
5601 /*
5602  * Issue a global reclaim complete.
5603  */
5604 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5605 {
5606         struct nfs4_reclaim_complete_data *calldata;
5607         struct rpc_task *task;
5608         struct rpc_message msg = {
5609                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5610         };
5611         struct rpc_task_setup task_setup_data = {
5612                 .rpc_client = clp->cl_rpcclient,
5613                 .rpc_message = &msg,
5614                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5615                 .flags = RPC_TASK_ASYNC,
5616         };
5617         int status = -ENOMEM;
5618
5619         dprintk("--> %s\n", __func__);
5620         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5621         if (calldata == NULL)
5622                 goto out;
5623         calldata->clp = clp;
5624         calldata->arg.one_fs = 0;
5625
5626         msg.rpc_argp = &calldata->arg;
5627         msg.rpc_resp = &calldata->res;
5628         task_setup_data.callback_data = calldata;
5629         task = rpc_run_task(&task_setup_data);
5630         if (IS_ERR(task)) {
5631                 status = PTR_ERR(task);
5632                 goto out;
5633         }
5634         status = nfs4_wait_for_completion_rpc_task(task);
5635         if (status == 0)
5636                 status = task->tk_status;
5637         rpc_put_task(task);
5638         return 0;
5639 out:
5640         dprintk("<-- %s status=%d\n", __func__, status);
5641         return status;
5642 }
5643
5644 static void
5645 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5646 {
5647         struct nfs4_layoutget *lgp = calldata;
5648         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5649
5650         dprintk("--> %s\n", __func__);
5651         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5652          * right now covering the LAYOUTGET we are about to send.
5653          * However, that is not so catastrophic, and there seems
5654          * to be no way to prevent it completely.
5655          */
5656         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5657                                 &lgp->res.seq_res, 0, task))
5658                 return;
5659         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5660                                           NFS_I(lgp->args.inode)->layout,
5661                                           lgp->args.ctx->state)) {
5662                 rpc_exit(task, NFS4_OK);
5663                 return;
5664         }
5665         rpc_call_start(task);
5666 }
5667
5668 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5669 {
5670         struct nfs4_layoutget *lgp = calldata;
5671         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5672
5673         dprintk("--> %s\n", __func__);
5674
5675         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5676                 return;
5677
5678         switch (task->tk_status) {
5679         case 0:
5680                 break;
5681         case -NFS4ERR_LAYOUTTRYLATER:
5682         case -NFS4ERR_RECALLCONFLICT:
5683                 task->tk_status = -NFS4ERR_DELAY;
5684                 /* Fall through */
5685         default:
5686                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5687                         rpc_restart_call_prepare(task);
5688                         return;
5689                 }
5690         }
5691         dprintk("<-- %s\n", __func__);
5692 }
5693
5694 static void nfs4_layoutget_release(void *calldata)
5695 {
5696         struct nfs4_layoutget *lgp = calldata;
5697
5698         dprintk("--> %s\n", __func__);
5699         put_nfs_open_context(lgp->args.ctx);
5700         kfree(calldata);
5701         dprintk("<-- %s\n", __func__);
5702 }
5703
5704 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5705         .rpc_call_prepare = nfs4_layoutget_prepare,
5706         .rpc_call_done = nfs4_layoutget_done,
5707         .rpc_release = nfs4_layoutget_release,
5708 };
5709
5710 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5711 {
5712         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5713         struct rpc_task *task;
5714         struct rpc_message msg = {
5715                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5716                 .rpc_argp = &lgp->args,
5717                 .rpc_resp = &lgp->res,
5718         };
5719         struct rpc_task_setup task_setup_data = {
5720                 .rpc_client = server->client,
5721                 .rpc_message = &msg,
5722                 .callback_ops = &nfs4_layoutget_call_ops,
5723                 .callback_data = lgp,
5724                 .flags = RPC_TASK_ASYNC,
5725         };
5726         int status = 0;
5727
5728         dprintk("--> %s\n", __func__);
5729
5730         lgp->res.layoutp = &lgp->args.layout;
5731         lgp->res.seq_res.sr_slot = NULL;
5732         task = rpc_run_task(&task_setup_data);
5733         if (IS_ERR(task))
5734                 return PTR_ERR(task);
5735         status = nfs4_wait_for_completion_rpc_task(task);
5736         if (status == 0)
5737                 status = task->tk_status;
5738         if (status == 0)
5739                 status = pnfs_layout_process(lgp);
5740         rpc_put_task(task);
5741         dprintk("<-- %s status=%d\n", __func__, status);
5742         return status;
5743 }
5744
5745 static void
5746 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
5747 {
5748         struct nfs4_layoutreturn *lrp = calldata;
5749
5750         dprintk("--> %s\n", __func__);
5751         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
5752                                 &lrp->res.seq_res, 0, task))
5753                 return;
5754         rpc_call_start(task);
5755 }
5756
5757 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
5758 {
5759         struct nfs4_layoutreturn *lrp = calldata;
5760         struct nfs_server *server;
5761         struct pnfs_layout_hdr *lo = lrp->args.layout;
5762
5763         dprintk("--> %s\n", __func__);
5764
5765         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
5766                 return;
5767
5768         server = NFS_SERVER(lrp->args.inode);
5769         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5770                 nfs_restart_rpc(task, lrp->clp);
5771                 return;
5772         }
5773         spin_lock(&lo->plh_inode->i_lock);
5774         if (task->tk_status == 0) {
5775                 if (lrp->res.lrs_present) {
5776                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
5777                 } else
5778                         BUG_ON(!list_empty(&lo->plh_segs));
5779         }
5780         lo->plh_block_lgets--;
5781         spin_unlock(&lo->plh_inode->i_lock);
5782         dprintk("<-- %s\n", __func__);
5783 }
5784
5785 static void nfs4_layoutreturn_release(void *calldata)
5786 {
5787         struct nfs4_layoutreturn *lrp = calldata;
5788
5789         dprintk("--> %s\n", __func__);
5790         put_layout_hdr(lrp->args.layout);
5791         kfree(calldata);
5792         dprintk("<-- %s\n", __func__);
5793 }
5794
5795 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
5796         .rpc_call_prepare = nfs4_layoutreturn_prepare,
5797         .rpc_call_done = nfs4_layoutreturn_done,
5798         .rpc_release = nfs4_layoutreturn_release,
5799 };
5800
5801 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
5802 {
5803         struct rpc_task *task;
5804         struct rpc_message msg = {
5805                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
5806                 .rpc_argp = &lrp->args,
5807                 .rpc_resp = &lrp->res,
5808         };
5809         struct rpc_task_setup task_setup_data = {
5810                 .rpc_client = lrp->clp->cl_rpcclient,
5811                 .rpc_message = &msg,
5812                 .callback_ops = &nfs4_layoutreturn_call_ops,
5813                 .callback_data = lrp,
5814         };
5815         int status;
5816
5817         dprintk("--> %s\n", __func__);
5818         task = rpc_run_task(&task_setup_data);
5819         if (IS_ERR(task))
5820                 return PTR_ERR(task);
5821         status = task->tk_status;
5822         dprintk("<-- %s status=%d\n", __func__, status);
5823         rpc_put_task(task);
5824         return status;
5825 }
5826
5827 /*
5828  * Retrieve the list of Data Server devices from the MDS.
5829  */
5830 static int _nfs4_getdevicelist(struct nfs_server *server,
5831                                     const struct nfs_fh *fh,
5832                                     struct pnfs_devicelist *devlist)
5833 {
5834         struct nfs4_getdevicelist_args args = {
5835                 .fh = fh,
5836                 .layoutclass = server->pnfs_curr_ld->id,
5837         };
5838         struct nfs4_getdevicelist_res res = {
5839                 .devlist = devlist,
5840         };
5841         struct rpc_message msg = {
5842                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
5843                 .rpc_argp = &args,
5844                 .rpc_resp = &res,
5845         };
5846         int status;
5847
5848         dprintk("--> %s\n", __func__);
5849         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5850                                 &res.seq_res, 0);
5851         dprintk("<-- %s status=%d\n", __func__, status);
5852         return status;
5853 }
5854
5855 int nfs4_proc_getdevicelist(struct nfs_server *server,
5856                             const struct nfs_fh *fh,
5857                             struct pnfs_devicelist *devlist)
5858 {
5859         struct nfs4_exception exception = { };
5860         int err;
5861
5862         do {
5863                 err = nfs4_handle_exception(server,
5864                                 _nfs4_getdevicelist(server, fh, devlist),
5865                                 &exception);
5866         } while (exception.retry);
5867
5868         dprintk("%s: err=%d, num_devs=%u\n", __func__,
5869                 err, devlist->num_devs);
5870
5871         return err;
5872 }
5873 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
5874
5875 static int
5876 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5877 {
5878         struct nfs4_getdeviceinfo_args args = {
5879                 .pdev = pdev,
5880         };
5881         struct nfs4_getdeviceinfo_res res = {
5882                 .pdev = pdev,
5883         };
5884         struct rpc_message msg = {
5885                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5886                 .rpc_argp = &args,
5887                 .rpc_resp = &res,
5888         };
5889         int status;
5890
5891         dprintk("--> %s\n", __func__);
5892         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5893         dprintk("<-- %s status=%d\n", __func__, status);
5894
5895         return status;
5896 }
5897
5898 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5899 {
5900         struct nfs4_exception exception = { };
5901         int err;
5902
5903         do {
5904                 err = nfs4_handle_exception(server,
5905                                         _nfs4_proc_getdeviceinfo(server, pdev),
5906                                         &exception);
5907         } while (exception.retry);
5908         return err;
5909 }
5910 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5911
5912 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
5913 {
5914         struct nfs4_layoutcommit_data *data = calldata;
5915         struct nfs_server *server = NFS_SERVER(data->args.inode);
5916
5917         if (nfs4_setup_sequence(server, &data->args.seq_args,
5918                                 &data->res.seq_res, 1, task))
5919                 return;
5920         rpc_call_start(task);
5921 }
5922
5923 static void
5924 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
5925 {
5926         struct nfs4_layoutcommit_data *data = calldata;
5927         struct nfs_server *server = NFS_SERVER(data->args.inode);
5928
5929         if (!nfs4_sequence_done(task, &data->res.seq_res))
5930                 return;
5931
5932         switch (task->tk_status) { /* Just ignore these failures */
5933         case NFS4ERR_DELEG_REVOKED: /* layout was recalled */
5934         case NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
5935         case NFS4ERR_BADLAYOUT:     /* no layout */
5936         case NFS4ERR_GRACE:         /* loca_recalim always false */
5937                 task->tk_status = 0;
5938         }
5939
5940         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5941                 nfs_restart_rpc(task, server->nfs_client);
5942                 return;
5943         }
5944
5945         if (task->tk_status == 0)
5946                 nfs_post_op_update_inode_force_wcc(data->args.inode,
5947                                                    data->res.fattr);
5948 }
5949
5950 static void nfs4_layoutcommit_release(void *calldata)
5951 {
5952         struct nfs4_layoutcommit_data *data = calldata;
5953         struct pnfs_layout_segment *lseg, *tmp;
5954
5955         pnfs_cleanup_layoutcommit(data);
5956         /* Matched by references in pnfs_set_layoutcommit */
5957         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
5958                 list_del_init(&lseg->pls_lc_list);
5959                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
5960                                        &lseg->pls_flags))
5961                         put_lseg(lseg);
5962         }
5963         put_rpccred(data->cred);
5964         kfree(data);
5965 }
5966
5967 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
5968         .rpc_call_prepare = nfs4_layoutcommit_prepare,
5969         .rpc_call_done = nfs4_layoutcommit_done,
5970         .rpc_release = nfs4_layoutcommit_release,
5971 };
5972
5973 int
5974 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
5975 {
5976         struct rpc_message msg = {
5977                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
5978                 .rpc_argp = &data->args,
5979                 .rpc_resp = &data->res,
5980                 .rpc_cred = data->cred,
5981         };
5982         struct rpc_task_setup task_setup_data = {
5983                 .task = &data->task,
5984                 .rpc_client = NFS_CLIENT(data->args.inode),
5985                 .rpc_message = &msg,
5986                 .callback_ops = &nfs4_layoutcommit_ops,
5987                 .callback_data = data,
5988                 .flags = RPC_TASK_ASYNC,
5989         };
5990         struct rpc_task *task;
5991         int status = 0;
5992
5993         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
5994                 "lbw: %llu inode %lu\n",
5995                 data->task.tk_pid, sync,
5996                 data->args.lastbytewritten,
5997                 data->args.inode->i_ino);
5998
5999         task = rpc_run_task(&task_setup_data);
6000         if (IS_ERR(task))
6001                 return PTR_ERR(task);
6002         if (sync == false)
6003                 goto out;
6004         status = nfs4_wait_for_completion_rpc_task(task);
6005         if (status != 0)
6006                 goto out;
6007         status = task->tk_status;
6008 out:
6009         dprintk("%s: status %d\n", __func__, status);
6010         rpc_put_task(task);
6011         return status;
6012 }
6013
6014 static int
6015 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6016                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6017 {
6018         struct nfs41_secinfo_no_name_args args = {
6019                 .style = SECINFO_STYLE_CURRENT_FH,
6020         };
6021         struct nfs4_secinfo_res res = {
6022                 .flavors = flavors,
6023         };
6024         struct rpc_message msg = {
6025                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6026                 .rpc_argp = &args,
6027                 .rpc_resp = &res,
6028         };
6029         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6030 }
6031
6032 static int
6033 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6034                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6035 {
6036         struct nfs4_exception exception = { };
6037         int err;
6038         do {
6039                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6040                 switch (err) {
6041                 case 0:
6042                 case -NFS4ERR_WRONGSEC:
6043                 case -NFS4ERR_NOTSUPP:
6044                         break;
6045                 default:
6046                         err = nfs4_handle_exception(server, err, &exception);
6047                 }
6048         } while (exception.retry);
6049         return err;
6050 }
6051
6052 static int
6053 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6054                     struct nfs_fsinfo *info)
6055 {
6056         int err;
6057         struct page *page;
6058         rpc_authflavor_t flavor;
6059         struct nfs4_secinfo_flavors *flavors;
6060
6061         page = alloc_page(GFP_KERNEL);
6062         if (!page) {
6063                 err = -ENOMEM;
6064                 goto out;
6065         }
6066
6067         flavors = page_address(page);
6068         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6069
6070         /*
6071          * Fall back on "guess and check" method if
6072          * the server doesn't support SECINFO_NO_NAME
6073          */
6074         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6075                 err = nfs4_find_root_sec(server, fhandle, info);
6076                 goto out_freepage;
6077         }
6078         if (err)
6079                 goto out_freepage;
6080
6081         flavor = nfs_find_best_sec(flavors);
6082         if (err == 0)
6083                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6084
6085 out_freepage:
6086         put_page(page);
6087         if (err == -EACCES)
6088                 return -EPERM;
6089 out:
6090         return err;
6091 }
6092 static int _nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6093 {
6094         int status;
6095         struct nfs41_test_stateid_args args = {
6096                 .stateid = &state->stateid,
6097         };
6098         struct nfs41_test_stateid_res res;
6099         struct rpc_message msg = {
6100                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6101                 .rpc_argp = &args,
6102                 .rpc_resp = &res,
6103         };
6104         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6105         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6106         return status;
6107 }
6108
6109 static int nfs41_test_stateid(struct nfs_server *server, struct nfs4_state *state)
6110 {
6111         struct nfs4_exception exception = { };
6112         int err;
6113         do {
6114                 err = nfs4_handle_exception(server,
6115                                 _nfs41_test_stateid(server, state),
6116                                 &exception);
6117         } while (exception.retry);
6118         return err;
6119 }
6120
6121 static int _nfs4_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6122 {
6123         int status;
6124         struct nfs41_free_stateid_args args = {
6125                 .stateid = &state->stateid,
6126         };
6127         struct nfs41_free_stateid_res res;
6128         struct rpc_message msg = {
6129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6130                 .rpc_argp = &args,
6131                 .rpc_resp = &res,
6132         };
6133
6134         args.seq_args.sa_session = res.seq_res.sr_session = NULL;
6135         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 0, 1);
6136         return status;
6137 }
6138
6139 static int nfs41_free_stateid(struct nfs_server *server, struct nfs4_state *state)
6140 {
6141         struct nfs4_exception exception = { };
6142         int err;
6143         do {
6144                 err = nfs4_handle_exception(server,
6145                                 _nfs4_free_stateid(server, state),
6146                                 &exception);
6147         } while (exception.retry);
6148         return err;
6149 }
6150 #endif /* CONFIG_NFS_V4_1 */
6151
6152 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6153         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6154         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6155         .recover_open   = nfs4_open_reclaim,
6156         .recover_lock   = nfs4_lock_reclaim,
6157         .establish_clid = nfs4_init_clientid,
6158         .get_clid_cred  = nfs4_get_setclientid_cred,
6159 };
6160
6161 #if defined(CONFIG_NFS_V4_1)
6162 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6163         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6164         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6165         .recover_open   = nfs4_open_reclaim,
6166         .recover_lock   = nfs4_lock_reclaim,
6167         .establish_clid = nfs41_init_clientid,
6168         .get_clid_cred  = nfs4_get_exchange_id_cred,
6169         .reclaim_complete = nfs41_proc_reclaim_complete,
6170 };
6171 #endif /* CONFIG_NFS_V4_1 */
6172
6173 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6174         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6175         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6176         .recover_open   = nfs4_open_expired,
6177         .recover_lock   = nfs4_lock_expired,
6178         .establish_clid = nfs4_init_clientid,
6179         .get_clid_cred  = nfs4_get_setclientid_cred,
6180 };
6181
6182 #if defined(CONFIG_NFS_V4_1)
6183 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6184         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6185         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6186         .recover_open   = nfs41_open_expired,
6187         .recover_lock   = nfs41_lock_expired,
6188         .establish_clid = nfs41_init_clientid,
6189         .get_clid_cred  = nfs4_get_exchange_id_cred,
6190 };
6191 #endif /* CONFIG_NFS_V4_1 */
6192
6193 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6194         .sched_state_renewal = nfs4_proc_async_renew,
6195         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6196         .renew_lease = nfs4_proc_renew,
6197 };
6198
6199 #if defined(CONFIG_NFS_V4_1)
6200 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6201         .sched_state_renewal = nfs41_proc_async_sequence,
6202         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6203         .renew_lease = nfs4_proc_sequence,
6204 };
6205 #endif
6206
6207 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6208         .minor_version = 0,
6209         .call_sync = _nfs4_call_sync,
6210         .validate_stateid = nfs4_validate_delegation_stateid,
6211         .find_root_sec = nfs4_find_root_sec,
6212         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6213         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6214         .state_renewal_ops = &nfs40_state_renewal_ops,
6215 };
6216
6217 #if defined(CONFIG_NFS_V4_1)
6218 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6219         .minor_version = 1,
6220         .call_sync = _nfs4_call_sync_session,
6221         .validate_stateid = nfs41_validate_delegation_stateid,
6222         .find_root_sec = nfs41_find_root_sec,
6223         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6224         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6225         .state_renewal_ops = &nfs41_state_renewal_ops,
6226 };
6227 #endif
6228
6229 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6230         [0] = &nfs_v4_0_minor_ops,
6231 #if defined(CONFIG_NFS_V4_1)
6232         [1] = &nfs_v4_1_minor_ops,
6233 #endif
6234 };
6235
6236 static const struct inode_operations nfs4_file_inode_operations = {
6237         .permission     = nfs_permission,
6238         .getattr        = nfs_getattr,
6239         .setattr        = nfs_setattr,
6240         .getxattr       = generic_getxattr,
6241         .setxattr       = generic_setxattr,
6242         .listxattr      = generic_listxattr,
6243         .removexattr    = generic_removexattr,
6244 };
6245
6246 const struct nfs_rpc_ops nfs_v4_clientops = {
6247         .version        = 4,                    /* protocol version */
6248         .dentry_ops     = &nfs4_dentry_operations,
6249         .dir_inode_ops  = &nfs4_dir_inode_operations,
6250         .file_inode_ops = &nfs4_file_inode_operations,
6251         .getroot        = nfs4_proc_get_root,
6252         .getattr        = nfs4_proc_getattr,
6253         .setattr        = nfs4_proc_setattr,
6254         .lookup         = nfs4_proc_lookup,
6255         .access         = nfs4_proc_access,
6256         .readlink       = nfs4_proc_readlink,
6257         .create         = nfs4_proc_create,
6258         .remove         = nfs4_proc_remove,
6259         .unlink_setup   = nfs4_proc_unlink_setup,
6260         .unlink_done    = nfs4_proc_unlink_done,
6261         .rename         = nfs4_proc_rename,
6262         .rename_setup   = nfs4_proc_rename_setup,
6263         .rename_done    = nfs4_proc_rename_done,
6264         .link           = nfs4_proc_link,
6265         .symlink        = nfs4_proc_symlink,
6266         .mkdir          = nfs4_proc_mkdir,
6267         .rmdir          = nfs4_proc_remove,
6268         .readdir        = nfs4_proc_readdir,
6269         .mknod          = nfs4_proc_mknod,
6270         .statfs         = nfs4_proc_statfs,
6271         .fsinfo         = nfs4_proc_fsinfo,
6272         .pathconf       = nfs4_proc_pathconf,
6273         .set_capabilities = nfs4_server_capabilities,
6274         .decode_dirent  = nfs4_decode_dirent,
6275         .read_setup     = nfs4_proc_read_setup,
6276         .read_done      = nfs4_read_done,
6277         .write_setup    = nfs4_proc_write_setup,
6278         .write_done     = nfs4_write_done,
6279         .commit_setup   = nfs4_proc_commit_setup,
6280         .commit_done    = nfs4_commit_done,
6281         .lock           = nfs4_proc_lock,
6282         .clear_acl_cache = nfs4_zap_acl_attr,
6283         .close_context  = nfs4_close_context,
6284         .open_context   = nfs4_atomic_open,
6285         .init_client    = nfs4_init_client,
6286         .secinfo        = nfs4_proc_secinfo,
6287 };
6288
6289 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6290         .prefix = XATTR_NAME_NFSV4_ACL,
6291         .list   = nfs4_xattr_list_nfs4_acl,
6292         .get    = nfs4_xattr_get_nfs4_acl,
6293         .set    = nfs4_xattr_set_nfs4_acl,
6294 };
6295
6296 const struct xattr_handler *nfs4_xattr_handlers[] = {
6297         &nfs4_xattr_nfs4_acl_handler,
6298         NULL
6299 };
6300
6301 /*
6302  * Local variables:
6303  *  c-basic-offset: 8
6304  * End:
6305  */