fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state, struct nfs4_label *ilabel,
  85                             struct nfs4_label *olabel);
  86 #ifdef CONFIG_NFS_V4_1
  87 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  88                 struct rpc_cred *);
  89 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 #endif
  92
  93 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  94 static inline struct nfs4_label *
  95 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  96         struct iattr *sattr, struct nfs4_label *label)
  97 {
  98         int err;
  99
 100         if (label == NULL)
 101                 return NULL;
 102
 103         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 104                 return NULL;
 105
 106         if (NFS_SERVER(dir)->nfs_client->cl_minorversion < 2)
 107                 return NULL;
 108
 109         err = security_dentry_init_security(dentry, sattr->ia_mode,
 110                                 &dentry->d_name, (void **)&label->label, &label->len);
 111         if (err == 0)
 112                 return label;
 113
 114         return NULL;
 115 }
 116 static inline void
 117 nfs4_label_release_security(struct nfs4_label *label)
 118 {
 119         if (label)
 120                 security_release_secctx(label->label, label->len);
 121 }
 122 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 123 {
 124         if (label)
 125                 return server->attr_bitmask;
 126
 127         return server->attr_bitmask_nl;
 128 }
 129 #else
 130 static inline struct nfs4_label *
 131 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 132         struct iattr *sattr, struct nfs4_label *l)
 133 { return NULL; }
 134 static inline void
 135 nfs4_label_release_security(struct nfs4_label *label)
 136 { return; }
 137 static inline u32 *
 138 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 139 { return server->attr_bitmask; }
 140 #endif
 141
 142 /* Prevent leaks of NFSv4 errors into userland */
 143 static int nfs4_map_errors(int err)
 144 {
 145         if (err >= -1000)
 146                 return err;
 147         switch (err) {
 148         case -NFS4ERR_RESOURCE:
 149         case -NFS4ERR_LAYOUTTRYLATER:
 150         case -NFS4ERR_RECALLCONFLICT:
 151                 return -EREMOTEIO;
 152         case -NFS4ERR_WRONGSEC:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_ACCESS:
 162                 return -EACCES;
 163         case -NFS4ERR_FILE_OPEN:
 164                 return -EBUSY;
 165         default:
 166                 dprintk("%s could not handle NFSv4 error %d\n",
 167                                 __func__, -err);
 168                 break;
 169         }
 170         return -EIO;
 171 }
 172
 173 /*
 174  * This is our standard bitmap for GETATTR requests.
 175  */
 176 const u32 nfs4_fattr_bitmap[3] = {
 177         FATTR4_WORD0_TYPE
 178         | FATTR4_WORD0_CHANGE
 179         | FATTR4_WORD0_SIZE
 180         | FATTR4_WORD0_FSID
 181         | FATTR4_WORD0_FILEID,
 182         FATTR4_WORD1_MODE
 183         | FATTR4_WORD1_NUMLINKS
 184         | FATTR4_WORD1_OWNER
 185         | FATTR4_WORD1_OWNER_GROUP
 186         | FATTR4_WORD1_RAWDEV
 187         | FATTR4_WORD1_SPACE_USED
 188         | FATTR4_WORD1_TIME_ACCESS
 189         | FATTR4_WORD1_TIME_METADATA
 190         | FATTR4_WORD1_TIME_MODIFY,
 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 192         FATTR4_WORD2_SECURITY_LABEL
 193 #endif
 194 };
 195
 196 static const u32 nfs4_pnfs_open_bitmap[3] = {
 197         FATTR4_WORD0_TYPE
 198         | FATTR4_WORD0_CHANGE
 199         | FATTR4_WORD0_SIZE
 200         | FATTR4_WORD0_FSID
 201         | FATTR4_WORD0_FILEID,
 202         FATTR4_WORD1_MODE
 203         | FATTR4_WORD1_NUMLINKS
 204         | FATTR4_WORD1_OWNER
 205         | FATTR4_WORD1_OWNER_GROUP
 206         | FATTR4_WORD1_RAWDEV
 207         | FATTR4_WORD1_SPACE_USED
 208         | FATTR4_WORD1_TIME_ACCESS
 209         | FATTR4_WORD1_TIME_METADATA
 210         | FATTR4_WORD1_TIME_MODIFY,
 211         FATTR4_WORD2_MDSTHRESHOLD
 212 };
 213
 214 static const u32 nfs4_open_noattr_bitmap[3] = {
 215         FATTR4_WORD0_TYPE
 216         | FATTR4_WORD0_CHANGE
 217         | FATTR4_WORD0_FILEID,
 218 };
 219
 220 const u32 nfs4_statfs_bitmap[3] = {
 221         FATTR4_WORD0_FILES_AVAIL
 222         | FATTR4_WORD0_FILES_FREE
 223         | FATTR4_WORD0_FILES_TOTAL,
 224         FATTR4_WORD1_SPACE_AVAIL
 225         | FATTR4_WORD1_SPACE_FREE
 226         | FATTR4_WORD1_SPACE_TOTAL
 227 };
 228
 229 const u32 nfs4_pathconf_bitmap[3] = {
 230         FATTR4_WORD0_MAXLINK
 231         | FATTR4_WORD0_MAXNAME,
 232         0
 233 };
 234
 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 236                         | FATTR4_WORD0_MAXREAD
 237                         | FATTR4_WORD0_MAXWRITE
 238                         | FATTR4_WORD0_LEASE_TIME,
 239                         FATTR4_WORD1_TIME_DELTA
 240                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 241                         FATTR4_WORD2_LAYOUT_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 318 {
 319         int res = 0;
 320
 321         might_sleep();
 322
 323         if (*timeout <= 0)
 324                 *timeout = NFS4_POLL_RETRY_MIN;
 325         if (*timeout > NFS4_POLL_RETRY_MAX)
 326                 *timeout = NFS4_POLL_RETRY_MAX;
 327         freezable_schedule_timeout_killable_unsafe(*timeout);
 328         if (fatal_signal_pending(current))
 329                 res = -ERESTARTSYS;
 330         *timeout <<= 1;
 331         return res;
 332 }
 333
 334 /* This is the error handling routine for processes that are allowed
 335  * to sleep.
 336  */
 337 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 338 {
 339         struct nfs_client *clp = server->nfs_client;
 340         struct nfs4_state *state = exception->state;
 341         struct inode *inode = exception->inode;
 342         int ret = errorcode;
 343
 344         exception->retry = 0;
 345         switch(errorcode) {
 346                 case 0:
 347                         return 0;
 348                 case -NFS4ERR_OPENMODE:
 349                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 350                                 nfs4_inode_return_delegation(inode);
 351                                 exception->retry = 1;
 352                                 return 0;
 353                         }
 354                         if (state == NULL)
 355                                 break;
 356                         ret = nfs4_schedule_stateid_recovery(server, state);
 357                         if (ret < 0)
 358                                 break;
 359                         goto wait_on_recovery;
 360                 case -NFS4ERR_DELEG_REVOKED:
 361                 case -NFS4ERR_ADMIN_REVOKED:
 362                 case -NFS4ERR_BAD_STATEID:
 363                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 364                                 nfs_remove_bad_delegation(inode);
 365                                 exception->retry = 1;
 366                                 break;
 367                         }
 368                         if (state == NULL)
 369                                 break;
 370                         ret = nfs4_schedule_stateid_recovery(server, state);
 371                         if (ret < 0)
 372                                 break;
 373                         goto wait_on_recovery;
 374                 case -NFS4ERR_EXPIRED:
 375                         if (state != NULL) {
 376                                 ret = nfs4_schedule_stateid_recovery(server, state);
 377                                 if (ret < 0)
 378                                         break;
 379                         }
 380                 case -NFS4ERR_STALE_STATEID:
 381                 case -NFS4ERR_STALE_CLIENTID:
 382                         nfs4_schedule_lease_recovery(clp);
 383                         goto wait_on_recovery;
 384 #if defined(CONFIG_NFS_V4_1)
 385                 case -NFS4ERR_BADSESSION:
 386                 case -NFS4ERR_BADSLOT:
 387                 case -NFS4ERR_BAD_HIGH_SLOT:
 388                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 389                 case -NFS4ERR_DEADSESSION:
 390                 case -NFS4ERR_SEQ_FALSE_RETRY:
 391                 case -NFS4ERR_SEQ_MISORDERED:
 392                         dprintk("%s ERROR: %d Reset session\n", __func__,
 393                                 errorcode);
 394                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 395                         goto wait_on_recovery;
 396 #endif /* defined(CONFIG_NFS_V4_1) */
 397                 case -NFS4ERR_FILE_OPEN:
 398                         if (exception->timeout > HZ) {
 399                                 /* We have retried a decent amount, time to
 400                                  * fail
 401                                  */
 402                                 ret = -EBUSY;
 403                                 break;
 404                         }
 405                 case -NFS4ERR_GRACE:
 406                 case -NFS4ERR_DELAY:
 407                         ret = nfs4_delay(server->client, &exception->timeout);
 408                         if (ret != 0)
 409                                 break;
 410                 case -NFS4ERR_RETRY_UNCACHED_REP:
 411                 case -NFS4ERR_OLD_STATEID:
 412                         exception->retry = 1;
 413                         break;
 414                 case -NFS4ERR_BADOWNER:
 415                         /* The following works around a Linux server bug! */
 416                 case -NFS4ERR_BADNAME:
 417                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 418                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 419                                 exception->retry = 1;
 420                                 printk(KERN_WARNING "NFS: v4 server %s "
 421                                                 "does not accept raw "
 422                                                 "uid/gids. "
 423                                                 "Reenabling the idmapper.\n",
 424                                                 server->nfs_client->cl_hostname);
 425                         }
 426         }
 427         /* We failed to handle the error */
 428         return nfs4_map_errors(ret);
 429 wait_on_recovery:
 430         ret = nfs4_wait_clnt_recover(clp);
 431         if (ret == 0)
 432                 exception->retry = 1;
 433         return ret;
 434 }
 435
 436
 437 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 438 {
 439         spin_lock(&clp->cl_lock);
 440         if (time_before(clp->cl_last_renewal,timestamp))
 441                 clp->cl_last_renewal = timestamp;
 442         spin_unlock(&clp->cl_lock);
 443 }
 444
 445 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 446 {
 447         do_renew_lease(server->nfs_client, timestamp);
 448 }
 449
 450 #if defined(CONFIG_NFS_V4_1)
 451
 452 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 453 {
 454         struct nfs4_session *session;
 455         struct nfs4_slot_table *tbl;
 456         bool send_new_highest_used_slotid = false;
 457
 458         if (!res->sr_slot) {
 459                 /* just wake up the next guy waiting since
 460                  * we may have not consumed a slot after all */
 461                 dprintk("%s: No slot\n", __func__);
 462                 return;
 463         }
 464         tbl = res->sr_slot->table;
 465         session = tbl->session;
 466
 467         spin_lock(&tbl->slot_tbl_lock);
 468         /* Be nice to the server: try to ensure that the last transmitted
 469          * value for highest_user_slotid <= target_highest_slotid
 470          */
 471         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 472                 send_new_highest_used_slotid = true;
 473
 474         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 475                 send_new_highest_used_slotid = false;
 476                 goto out_unlock;
 477         }
 478         nfs4_free_slot(tbl, res->sr_slot);
 479
 480         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 481                 send_new_highest_used_slotid = false;
 482 out_unlock:
 483         spin_unlock(&tbl->slot_tbl_lock);
 484         res->sr_slot = NULL;
 485         if (send_new_highest_used_slotid)
 486                 nfs41_server_notify_highest_slotid_update(session->clp);
 487 }
 488
 489 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 490 {
 491         struct nfs4_session *session;
 492         struct nfs4_slot *slot;
 493         struct nfs_client *clp;
 494         bool interrupted = false;
 495         int ret = 1;
 496
 497         /* don't increment the sequence number if the task wasn't sent */
 498         if (!RPC_WAS_SENT(task))
 499                 goto out;
 500
 501         slot = res->sr_slot;
 502         session = slot->table->session;
 503
 504         if (slot->interrupted) {
 505                 slot->interrupted = 0;
 506                 interrupted = true;
 507         }
 508
 509         /* Check the SEQUENCE operation status */
 510         switch (res->sr_status) {
 511         case 0:
 512                 /* Update the slot's sequence and clientid lease timer */
 513                 ++slot->seq_nr;
 514                 clp = session->clp;
 515                 do_renew_lease(clp, res->sr_timestamp);
 516                 /* Check sequence flags */
 517                 if (res->sr_status_flags != 0)
 518                         nfs4_schedule_lease_recovery(clp);
 519                 nfs41_update_target_slotid(slot->table, slot, res);
 520                 break;
 521         case 1:
 522                 /*
 523                  * sr_status remains 1 if an RPC level error occurred.
 524                  * The server may or may not have processed the sequence
 525                  * operation..
 526                  * Mark the slot as having hosted an interrupted RPC call.
 527                  */
 528                 slot->interrupted = 1;
 529                 goto out;
 530         case -NFS4ERR_DELAY:
 531                 /* The server detected a resend of the RPC call and
 532                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 533                  * of RFC5661.
 534                  */
 535                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 536                         __func__,
 537                         slot->slot_nr,
 538                         slot->seq_nr);
 539                 goto out_retry;
 540         case -NFS4ERR_BADSLOT:
 541                 /*
 542                  * The slot id we used was probably retired. Try again
 543                  * using a different slot id.
 544                  */
 545                 goto retry_nowait;
 546         case -NFS4ERR_SEQ_MISORDERED:
 547                 /*
 548                  * Was the last operation on this sequence interrupted?
 549                  * If so, retry after bumping the sequence number.
 550                  */
 551                 if (interrupted) {
 552                         ++slot->seq_nr;
 553                         goto retry_nowait;
 554                 }
 555                 /*
 556                  * Could this slot have been previously retired?
 557                  * If so, then the server may be expecting seq_nr = 1!
 558                  */
 559                 if (slot->seq_nr != 1) {
 560                         slot->seq_nr = 1;
 561                         goto retry_nowait;
 562                 }
 563                 break;
 564         case -NFS4ERR_SEQ_FALSE_RETRY:
 565                 ++slot->seq_nr;
 566                 goto retry_nowait;
 567         default:
 568                 /* Just update the slot sequence no. */
 569                 ++slot->seq_nr;
 570         }
 571 out:
 572         /* The session may be reset by one of the error handlers. */
 573         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 574         nfs41_sequence_free_slot(res);
 575         return ret;
 576 retry_nowait:
 577         if (rpc_restart_call_prepare(task)) {
 578                 task->tk_status = 0;
 579                 ret = 0;
 580         }
 581         goto out;
 582 out_retry:
 583         if (!rpc_restart_call(task))
 584                 goto out;
 585         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 586         return 0;
 587 }
 588
 589 static int nfs4_sequence_done(struct rpc_task *task,
 590                                struct nfs4_sequence_res *res)
 591 {
 592         if (res->sr_slot == NULL)
 593                 return 1;
 594         return nfs41_sequence_done(task, res);
 595 }
 596
 597 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 598                 struct nfs4_sequence_res *res, int cache_reply)
 599 {
 600         args->sa_slot = NULL;
 601         args->sa_cache_this = 0;
 602         args->sa_privileged = 0;
 603         if (cache_reply)
 604                 args->sa_cache_this = 1;
 605         res->sr_slot = NULL;
 606 }
 607
 608 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 609 {
 610         args->sa_privileged = 1;
 611 }
 612
 613 int nfs41_setup_sequence(struct nfs4_session *session,
 614                                 struct nfs4_sequence_args *args,
 615                                 struct nfs4_sequence_res *res,
 616                                 struct rpc_task *task)
 617 {
 618         struct nfs4_slot *slot;
 619         struct nfs4_slot_table *tbl;
 620
 621         dprintk("--> %s\n", __func__);
 622         /* slot already allocated? */
 623         if (res->sr_slot != NULL)
 624                 goto out_success;
 625
 626         tbl = &session->fc_slot_table;
 627
 628         task->tk_timeout = 0;
 629
 630         spin_lock(&tbl->slot_tbl_lock);
 631         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 632             !args->sa_privileged) {
 633                 /* The state manager will wait until the slot table is empty */
 634                 dprintk("%s session is draining\n", __func__);
 635                 goto out_sleep;
 636         }
 637
 638         slot = nfs4_alloc_slot(tbl);
 639         if (IS_ERR(slot)) {
 640                 /* If out of memory, try again in 1/4 second */
 641                 if (slot == ERR_PTR(-ENOMEM))
 642                         task->tk_timeout = HZ >> 2;
 643                 dprintk("<-- %s: no free slots\n", __func__);
 644                 goto out_sleep;
 645         }
 646         spin_unlock(&tbl->slot_tbl_lock);
 647
 648         args->sa_slot = slot;
 649
 650         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 651                         slot->slot_nr, slot->seq_nr);
 652
 653         res->sr_slot = slot;
 654         res->sr_timestamp = jiffies;
 655         res->sr_status_flags = 0;
 656         /*
 657          * sr_status is only set in decode_sequence, and so will remain
 658          * set to 1 if an rpc level failure occurs.
 659          */
 660         res->sr_status = 1;
 661 out_success:
 662         rpc_call_start(task);
 663         return 0;
 664 out_sleep:
 665         /* Privileged tasks are queued with top priority */
 666         if (args->sa_privileged)
 667                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 668                                 NULL, RPC_PRIORITY_PRIVILEGED);
 669         else
 670                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 671         spin_unlock(&tbl->slot_tbl_lock);
 672         return -EAGAIN;
 673 }
 674 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 675
 676 int nfs4_setup_sequence(const struct nfs_server *server,
 677                         struct nfs4_sequence_args *args,
 678                         struct nfs4_sequence_res *res,
 679                         struct rpc_task *task)
 680 {
 681         struct nfs4_session *session = nfs4_get_session(server);
 682         int ret = 0;
 683
 684         if (session == NULL) {
 685                 rpc_call_start(task);
 686                 goto out;
 687         }
 688
 689         dprintk("--> %s clp %p session %p sr_slot %d\n",
 690                 __func__, session->clp, session, res->sr_slot ?
 691                         res->sr_slot->slot_nr : -1);
 692
 693         ret = nfs41_setup_sequence(session, args, res, task);
 694 out:
 695         dprintk("<-- %s status=%d\n", __func__, ret);
 696         return ret;
 697 }
 698
 699 struct nfs41_call_sync_data {
 700         const struct nfs_server *seq_server;
 701         struct nfs4_sequence_args *seq_args;
 702         struct nfs4_sequence_res *seq_res;
 703 };
 704
 705 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 706 {
 707         struct nfs41_call_sync_data *data = calldata;
 708         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 709
 710         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 711
 712         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 713 }
 714
 715 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 716 {
 717         struct nfs41_call_sync_data *data = calldata;
 718
 719         nfs41_sequence_done(task, data->seq_res);
 720 }
 721
 722 static const struct rpc_call_ops nfs41_call_sync_ops = {
 723         .rpc_call_prepare = nfs41_call_sync_prepare,
 724         .rpc_call_done = nfs41_call_sync_done,
 725 };
 726
 727 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 728                                    struct nfs_server *server,
 729                                    struct rpc_message *msg,
 730                                    struct nfs4_sequence_args *args,
 731                                    struct nfs4_sequence_res *res)
 732 {
 733         int ret;
 734         struct rpc_task *task;
 735         struct nfs41_call_sync_data data = {
 736                 .seq_server = server,
 737                 .seq_args = args,
 738                 .seq_res = res,
 739         };
 740         struct rpc_task_setup task_setup = {
 741                 .rpc_client = clnt,
 742                 .rpc_message = msg,
 743                 .callback_ops = &nfs41_call_sync_ops,
 744                 .callback_data = &data
 745         };
 746
 747         task = rpc_run_task(&task_setup);
 748         if (IS_ERR(task))
 749                 ret = PTR_ERR(task);
 750         else {
 751                 ret = task->tk_status;
 752                 rpc_put_task(task);
 753         }
 754         return ret;
 755 }
 756
 757 #else
 758 static
 759 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 760                 struct nfs4_sequence_res *res, int cache_reply)
 761 {
 762 }
 763
 764 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 765 {
 766 }
 767
 768
 769 static int nfs4_sequence_done(struct rpc_task *task,
 770                                struct nfs4_sequence_res *res)
 771 {
 772         return 1;
 773 }
 774 #endif /* CONFIG_NFS_V4_1 */
 775
 776 static
 777 int _nfs4_call_sync(struct rpc_clnt *clnt,
 778                     struct nfs_server *server,
 779                     struct rpc_message *msg,
 780                     struct nfs4_sequence_args *args,
 781                     struct nfs4_sequence_res *res)
 782 {
 783         return rpc_call_sync(clnt, msg, 0);
 784 }
 785
 786 static
 787 int nfs4_call_sync(struct rpc_clnt *clnt,
 788                    struct nfs_server *server,
 789                    struct rpc_message *msg,
 790                    struct nfs4_sequence_args *args,
 791                    struct nfs4_sequence_res *res,
 792                    int cache_reply)
 793 {
 794         nfs41_init_sequence(args, res, cache_reply);
 795         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 796                                                 args, res);
 797 }
 798
 799 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 800 {
 801         struct nfs_inode *nfsi = NFS_I(dir);
 802
 803         spin_lock(&dir->i_lock);
 804         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 805         if (!cinfo->atomic || cinfo->before != dir->i_version)
 806                 nfs_force_lookup_revalidate(dir);
 807         dir->i_version = cinfo->after;
 808         nfs_fscache_invalidate(dir);
 809         spin_unlock(&dir->i_lock);
 810 }
 811
 812 struct nfs4_opendata {
 813         struct kref kref;
 814         struct nfs_openargs o_arg;
 815         struct nfs_openres o_res;
 816         struct nfs_open_confirmargs c_arg;
 817         struct nfs_open_confirmres c_res;
 818         struct nfs4_string owner_name;
 819         struct nfs4_string group_name;
 820         struct nfs_fattr f_attr;
 821         struct nfs4_label *f_label;
 822         struct dentry *dir;
 823         struct dentry *dentry;
 824         struct nfs4_state_owner *owner;
 825         struct nfs4_state *state;
 826         struct iattr attrs;
 827         unsigned long timestamp;
 828         unsigned int rpc_done : 1;
 829         unsigned int is_recover : 1;
 830         int rpc_status;
 831         int cancelled;
 832 };
 833
 834 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 835                 int err, struct nfs4_exception *exception)
 836 {
 837         if (err != -EINVAL)
 838                 return false;
 839         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 840                 return false;
 841         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 842         exception->retry = 1;
 843         return true;
 844 }
 845
 846 static enum open_claim_type4
 847 nfs4_map_atomic_open_claim(struct nfs_server *server,
 848                 enum open_claim_type4 claim)
 849 {
 850         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 851                 return claim;
 852         switch (claim) {
 853         default:
 854                 return claim;
 855         case NFS4_OPEN_CLAIM_FH:
 856                 return NFS4_OPEN_CLAIM_NULL;
 857         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 858                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 859         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 860                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 861         }
 862 }
 863
 864 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 865 {
 866         p->o_res.f_attr = &p->f_attr;
 867         p->o_res.f_label = p->f_label;
 868         p->o_res.seqid = p->o_arg.seqid;
 869         p->c_res.seqid = p->c_arg.seqid;
 870         p->o_res.server = p->o_arg.server;
 871         p->o_res.access_request = p->o_arg.access;
 872         nfs_fattr_init(&p->f_attr);
 873         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 874 }
 875
 876 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 877                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 878                 const struct iattr *attrs,
 879                 struct nfs4_label *label,
 880                 enum open_claim_type4 claim,
 881                 gfp_t gfp_mask)
 882 {
 883         struct dentry *parent = dget_parent(dentry);
 884         struct inode *dir = parent->d_inode;
 885         struct nfs_server *server = NFS_SERVER(dir);
 886         struct nfs4_opendata *p;
 887
 888         p = kzalloc(sizeof(*p), gfp_mask);
 889         if (p == NULL)
 890                 goto err;
 891
 892         p->f_label = nfs4_label_alloc(server, gfp_mask);
 893         if (IS_ERR(p->f_label))
 894                 goto err_free_p;
 895
 896         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 897         if (p->o_arg.seqid == NULL)
 898                 goto err_free_label;
 899         nfs_sb_active(dentry->d_sb);
 900         p->dentry = dget(dentry);
 901         p->dir = parent;
 902         p->owner = sp;
 903         atomic_inc(&sp->so_count);
 904         p->o_arg.open_flags = flags;
 905         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 906         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 907          * will return permission denied for all bits until close */
 908         if (!(flags & O_EXCL)) {
 909                 /* ask server to check for all possible rights as results
 910                  * are cached */
 911                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 912                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 913         }
 914         p->o_arg.clientid = server->nfs_client->cl_clientid;
 915         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 916         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 917         p->o_arg.name = &dentry->d_name;
 918         p->o_arg.server = server;
 919         p->o_arg.bitmask = nfs4_bitmask(server, label);
 920         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 921         p->o_arg.label = label;
 922         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
 923         switch (p->o_arg.claim) {
 924         case NFS4_OPEN_CLAIM_NULL:
 925         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 926         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 927                 p->o_arg.fh = NFS_FH(dir);
 928                 break;
 929         case NFS4_OPEN_CLAIM_PREVIOUS:
 930         case NFS4_OPEN_CLAIM_FH:
 931         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 932         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 933                 p->o_arg.fh = NFS_FH(dentry->d_inode);
 934         }
 935         if (attrs != NULL && attrs->ia_valid != 0) {
 936                 __u32 verf[2];
 937
 938                 p->o_arg.u.attrs = &p->attrs;
 939                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 940
 941                 verf[0] = jiffies;
 942                 verf[1] = current->pid;
 943                 memcpy(p->o_arg.u.verifier.data, verf,
 944                                 sizeof(p->o_arg.u.verifier.data));
 945         }
 946         p->c_arg.fh = &p->o_res.fh;
 947         p->c_arg.stateid = &p->o_res.stateid;
 948         p->c_arg.seqid = p->o_arg.seqid;
 949         nfs4_init_opendata_res(p);
 950         kref_init(&p->kref);
 951         return p;
 952
 953 err_free_label:
 954         nfs4_label_free(p->f_label);
 955 err_free_p:
 956         kfree(p);
 957 err:
 958         dput(parent);
 959         return NULL;
 960 }
 961
 962 static void nfs4_opendata_free(struct kref *kref)
 963 {
 964         struct nfs4_opendata *p = container_of(kref,
 965                         struct nfs4_opendata, kref);
 966         struct super_block *sb = p->dentry->d_sb;
 967
 968         nfs_free_seqid(p->o_arg.seqid);
 969         if (p->state != NULL)
 970                 nfs4_put_open_state(p->state);
 971         nfs4_put_state_owner(p->owner);
 972
 973         nfs4_label_free(p->f_label);
 974
 975         dput(p->dir);
 976         dput(p->dentry);
 977         nfs_sb_deactive(sb);
 978         nfs_fattr_free_names(&p->f_attr);
 979         kfree(p);
 980 }
 981
 982 static void nfs4_opendata_put(struct nfs4_opendata *p)
 983 {
 984         if (p != NULL)
 985                 kref_put(&p->kref, nfs4_opendata_free);
 986 }
 987
 988 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 989 {
 990         int ret;
 991
 992         ret = rpc_wait_for_completion_task(task);
 993         return ret;
 994 }
 995
 996 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 997 {
 998         int ret = 0;
 999
1000         if (open_mode & (O_EXCL|O_TRUNC))
1001                 goto out;
1002         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1003                 case FMODE_READ:
1004                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1005                                 && state->n_rdonly != 0;
1006                         break;
1007                 case FMODE_WRITE:
1008                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1009                                 && state->n_wronly != 0;
1010                         break;
1011                 case FMODE_READ|FMODE_WRITE:
1012                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1013                                 && state->n_rdwr != 0;
1014         }
1015 out:
1016         return ret;
1017 }
1018
1019 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1020 {
1021         if (delegation == NULL)
1022                 return 0;
1023         if ((delegation->type & fmode) != fmode)
1024                 return 0;
1025         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1026                 return 0;
1027         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1028                 return 0;
1029         nfs_mark_delegation_referenced(delegation);
1030         return 1;
1031 }
1032
1033 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1034 {
1035         switch (fmode) {
1036                 case FMODE_WRITE:
1037                         state->n_wronly++;
1038                         break;
1039                 case FMODE_READ:
1040                         state->n_rdonly++;
1041                         break;
1042                 case FMODE_READ|FMODE_WRITE:
1043                         state->n_rdwr++;
1044         }
1045         nfs4_state_set_mode_locked(state, state->state | fmode);
1046 }
1047
1048 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1049 {
1050         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1051                 nfs4_stateid_copy(&state->stateid, stateid);
1052         nfs4_stateid_copy(&state->open_stateid, stateid);
1053         set_bit(NFS_OPEN_STATE, &state->flags);
1054         switch (fmode) {
1055                 case FMODE_READ:
1056                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1057                         break;
1058                 case FMODE_WRITE:
1059                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1060                         break;
1061                 case FMODE_READ|FMODE_WRITE:
1062                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1063         }
1064 }
1065
1066 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1067 {
1068         write_seqlock(&state->seqlock);
1069         nfs_set_open_stateid_locked(state, stateid, fmode);
1070         write_sequnlock(&state->seqlock);
1071 }
1072
1073 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1074 {
1075         /*
1076          * Protect the call to nfs4_state_set_mode_locked and
1077          * serialise the stateid update
1078          */
1079         write_seqlock(&state->seqlock);
1080         if (deleg_stateid != NULL) {
1081                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1082                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1083         }
1084         if (open_stateid != NULL)
1085                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1086         write_sequnlock(&state->seqlock);
1087         spin_lock(&state->owner->so_lock);
1088         update_open_stateflags(state, fmode);
1089         spin_unlock(&state->owner->so_lock);
1090 }
1091
1092 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1093 {
1094         struct nfs_inode *nfsi = NFS_I(state->inode);
1095         struct nfs_delegation *deleg_cur;
1096         int ret = 0;
1097
1098         fmode &= (FMODE_READ|FMODE_WRITE);
1099
1100         rcu_read_lock();
1101         deleg_cur = rcu_dereference(nfsi->delegation);
1102         if (deleg_cur == NULL)
1103                 goto no_delegation;
1104
1105         spin_lock(&deleg_cur->lock);
1106         if (nfsi->delegation != deleg_cur ||
1107            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1108             (deleg_cur->type & fmode) != fmode)
1109                 goto no_delegation_unlock;
1110
1111         if (delegation == NULL)
1112                 delegation = &deleg_cur->stateid;
1113         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1114                 goto no_delegation_unlock;
1115
1116         nfs_mark_delegation_referenced(deleg_cur);
1117         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1118         ret = 1;
1119 no_delegation_unlock:
1120         spin_unlock(&deleg_cur->lock);
1121 no_delegation:
1122         rcu_read_unlock();
1123
1124         if (!ret && open_stateid != NULL) {
1125                 __update_open_stateid(state, open_stateid, NULL, fmode);
1126                 ret = 1;
1127         }
1128
1129         return ret;
1130 }
1131
1132
1133 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1134 {
1135         struct nfs_delegation *delegation;
1136
1137         rcu_read_lock();
1138         delegation = rcu_dereference(NFS_I(inode)->delegation);
1139         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1140                 rcu_read_unlock();
1141                 return;
1142         }
1143         rcu_read_unlock();
1144         nfs4_inode_return_delegation(inode);
1145 }
1146
1147 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1148 {
1149         struct nfs4_state *state = opendata->state;
1150         struct nfs_inode *nfsi = NFS_I(state->inode);
1151         struct nfs_delegation *delegation;
1152         int open_mode = opendata->o_arg.open_flags;
1153         fmode_t fmode = opendata->o_arg.fmode;
1154         nfs4_stateid stateid;
1155         int ret = -EAGAIN;
1156
1157         for (;;) {
1158                 if (can_open_cached(state, fmode, open_mode)) {
1159                         spin_lock(&state->owner->so_lock);
1160                         if (can_open_cached(state, fmode, open_mode)) {
1161                                 update_open_stateflags(state, fmode);
1162                                 spin_unlock(&state->owner->so_lock);
1163                                 goto out_return_state;
1164                         }
1165                         spin_unlock(&state->owner->so_lock);
1166                 }
1167                 rcu_read_lock();
1168                 delegation = rcu_dereference(nfsi->delegation);
1169                 if (!can_open_delegated(delegation, fmode)) {
1170                         rcu_read_unlock();
1171                         break;
1172                 }
1173                 /* Save the delegation */
1174                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1175                 rcu_read_unlock();
1176                 nfs_release_seqid(opendata->o_arg.seqid);
1177                 if (!opendata->is_recover) {
1178                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1179                         if (ret != 0)
1180                                 goto out;
1181                 }
1182                 ret = -EAGAIN;
1183
1184                 /* Try to update the stateid using the delegation */
1185                 if (update_open_stateid(state, NULL, &stateid, fmode))
1186                         goto out_return_state;
1187         }
1188 out:
1189         return ERR_PTR(ret);
1190 out_return_state:
1191         atomic_inc(&state->count);
1192         return state;
1193 }
1194
1195 static void
1196 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1197 {
1198         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1199         struct nfs_delegation *delegation;
1200         int delegation_flags = 0;
1201
1202         rcu_read_lock();
1203         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1204         if (delegation)
1205                 delegation_flags = delegation->flags;
1206         rcu_read_unlock();
1207         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1208                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1209                                    "returning a delegation for "
1210                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1211                                    clp->cl_hostname);
1212         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1213                 nfs_inode_set_delegation(state->inode,
1214                                          data->owner->so_cred,
1215                                          &data->o_res);
1216         else
1217                 nfs_inode_reclaim_delegation(state->inode,
1218                                              data->owner->so_cred,
1219                                              &data->o_res);
1220 }
1221
1222 /*
1223  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1224  * and update the nfs4_state.
1225  */
1226 static struct nfs4_state *
1227 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1228 {
1229         struct inode *inode = data->state->inode;
1230         struct nfs4_state *state = data->state;
1231         int ret;
1232
1233         if (!data->rpc_done) {
1234                 ret = data->rpc_status;
1235                 goto err;
1236         }
1237
1238         ret = -ESTALE;
1239         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1240             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1241             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1242                 goto err;
1243
1244         ret = -ENOMEM;
1245         state = nfs4_get_open_state(inode, data->owner);
1246         if (state == NULL)
1247                 goto err;
1248
1249         ret = nfs_refresh_inode(inode, &data->f_attr);
1250         if (ret)
1251                 goto err;
1252
1253         nfs_setsecurity(inode, &data->f_attr, data->f_label);
1254
1255         if (data->o_res.delegation_type != 0)
1256                 nfs4_opendata_check_deleg(data, state);
1257         update_open_stateid(state, &data->o_res.stateid, NULL,
1258                             data->o_arg.fmode);
1259
1260         return state;
1261 err:
1262         return ERR_PTR(ret);
1263
1264 }
1265
1266 static struct nfs4_state *
1267 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1268 {
1269         struct inode *inode;
1270         struct nfs4_state *state = NULL;
1271         int ret;
1272
1273         if (!data->rpc_done) {
1274                 state = nfs4_try_open_cached(data);
1275                 goto out;
1276         }
1277
1278         ret = -EAGAIN;
1279         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1280                 goto err;
1281         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1282         ret = PTR_ERR(inode);
1283         if (IS_ERR(inode))
1284                 goto err;
1285         ret = -ENOMEM;
1286         state = nfs4_get_open_state(inode, data->owner);
1287         if (state == NULL)
1288                 goto err_put_inode;
1289         if (data->o_res.delegation_type != 0)
1290                 nfs4_opendata_check_deleg(data, state);
1291         update_open_stateid(state, &data->o_res.stateid, NULL,
1292                         data->o_arg.fmode);
1293         iput(inode);
1294 out:
1295         nfs_release_seqid(data->o_arg.seqid);
1296         return state;
1297 err_put_inode:
1298         iput(inode);
1299 err:
1300         return ERR_PTR(ret);
1301 }
1302
1303 static struct nfs4_state *
1304 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1305 {
1306         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1307                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1308         return _nfs4_opendata_to_nfs4_state(data);
1309 }
1310
1311 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1312 {
1313         struct nfs_inode *nfsi = NFS_I(state->inode);
1314         struct nfs_open_context *ctx;
1315
1316         spin_lock(&state->inode->i_lock);
1317         list_for_each_entry(ctx, &nfsi->open_files, list) {
1318                 if (ctx->state != state)
1319                         continue;
1320                 get_nfs_open_context(ctx);
1321                 spin_unlock(&state->inode->i_lock);
1322                 return ctx;
1323         }
1324         spin_unlock(&state->inode->i_lock);
1325         return ERR_PTR(-ENOENT);
1326 }
1327
1328 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1329                 struct nfs4_state *state, enum open_claim_type4 claim)
1330 {
1331         struct nfs4_opendata *opendata;
1332
1333         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1334                         NULL, NULL, claim, GFP_NOFS);
1335         if (opendata == NULL)
1336                 return ERR_PTR(-ENOMEM);
1337         opendata->state = state;
1338         atomic_inc(&state->count);
1339         return opendata;
1340 }
1341
1342 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1343 {
1344         struct nfs4_state *newstate;
1345         int ret;
1346
1347         opendata->o_arg.open_flags = 0;
1348         opendata->o_arg.fmode = fmode;
1349         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1350         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1351         nfs4_init_opendata_res(opendata);
1352         ret = _nfs4_recover_proc_open(opendata);
1353         if (ret != 0)
1354                 return ret;
1355         newstate = nfs4_opendata_to_nfs4_state(opendata);
1356         if (IS_ERR(newstate))
1357                 return PTR_ERR(newstate);
1358         nfs4_close_state(newstate, fmode);
1359         *res = newstate;
1360         return 0;
1361 }
1362
1363 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1364 {
1365         struct nfs4_state *newstate;
1366         int ret;
1367
1368         /* memory barrier prior to reading state->n_* */
1369         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1370         clear_bit(NFS_OPEN_STATE, &state->flags);
1371         smp_rmb();
1372         if (state->n_rdwr != 0) {
1373                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1374                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1375                 if (ret != 0)
1376                         return ret;
1377                 if (newstate != state)
1378                         return -ESTALE;
1379         }
1380         if (state->n_wronly != 0) {
1381                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1382                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1383                 if (ret != 0)
1384                         return ret;
1385                 if (newstate != state)
1386                         return -ESTALE;
1387         }
1388         if (state->n_rdonly != 0) {
1389                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1390                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1391                 if (ret != 0)
1392                         return ret;
1393                 if (newstate != state)
1394                         return -ESTALE;
1395         }
1396         /*
1397          * We may have performed cached opens for all three recoveries.
1398          * Check if we need to update the current stateid.
1399          */
1400         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1401             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1402                 write_seqlock(&state->seqlock);
1403                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1404                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1405                 write_sequnlock(&state->seqlock);
1406         }
1407         return 0;
1408 }
1409
1410 /*
1411  * OPEN_RECLAIM:
1412  *      reclaim state on the server after a reboot.
1413  */
1414 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1415 {
1416         struct nfs_delegation *delegation;
1417         struct nfs4_opendata *opendata;
1418         fmode_t delegation_type = 0;
1419         int status;
1420
1421         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1422                         NFS4_OPEN_CLAIM_PREVIOUS);
1423         if (IS_ERR(opendata))
1424                 return PTR_ERR(opendata);
1425         rcu_read_lock();
1426         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1427         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1428                 delegation_type = delegation->type;
1429         rcu_read_unlock();
1430         opendata->o_arg.u.delegation_type = delegation_type;
1431         status = nfs4_open_recover(opendata, state);
1432         nfs4_opendata_put(opendata);
1433         return status;
1434 }
1435
1436 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1437 {
1438         struct nfs_server *server = NFS_SERVER(state->inode);
1439         struct nfs4_exception exception = { };
1440         int err;
1441         do {
1442                 err = _nfs4_do_open_reclaim(ctx, state);
1443                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1444                         continue;
1445                 if (err != -NFS4ERR_DELAY)
1446                         break;
1447                 nfs4_handle_exception(server, err, &exception);
1448         } while (exception.retry);
1449         return err;
1450 }
1451
1452 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1453 {
1454         struct nfs_open_context *ctx;
1455         int ret;
1456
1457         ctx = nfs4_state_find_open_context(state);
1458         if (IS_ERR(ctx))
1459                 return -EAGAIN;
1460         ret = nfs4_do_open_reclaim(ctx, state);
1461         put_nfs_open_context(ctx);
1462         return ret;
1463 }
1464
1465 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1466 {
1467         switch (err) {
1468                 default:
1469                         printk(KERN_ERR "NFS: %s: unhandled error "
1470                                         "%d.\n", __func__, err);
1471                 case 0:
1472                 case -ENOENT:
1473                 case -ESTALE:
1474                         break;
1475                 case -NFS4ERR_BADSESSION:
1476                 case -NFS4ERR_BADSLOT:
1477                 case -NFS4ERR_BAD_HIGH_SLOT:
1478                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1479                 case -NFS4ERR_DEADSESSION:
1480                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1481                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1482                         return -EAGAIN;
1483                 case -NFS4ERR_STALE_CLIENTID:
1484                 case -NFS4ERR_STALE_STATEID:
1485                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1486                 case -NFS4ERR_EXPIRED:
1487                         /* Don't recall a delegation if it was lost */
1488                         nfs4_schedule_lease_recovery(server->nfs_client);
1489                         return -EAGAIN;
1490                 case -NFS4ERR_DELEG_REVOKED:
1491                 case -NFS4ERR_ADMIN_REVOKED:
1492                 case -NFS4ERR_BAD_STATEID:
1493                 case -NFS4ERR_OPENMODE:
1494                         nfs_inode_find_state_and_recover(state->inode,
1495                                         stateid);
1496                         nfs4_schedule_stateid_recovery(server, state);
1497                         return 0;
1498                 case -NFS4ERR_DELAY:
1499                 case -NFS4ERR_GRACE:
1500                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1501                         ssleep(1);
1502                         return -EAGAIN;
1503                 case -ENOMEM:
1504                 case -NFS4ERR_DENIED:
1505                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1506                         return 0;
1507         }
1508         return err;
1509 }
1510
1511 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1512 {
1513         struct nfs_server *server = NFS_SERVER(state->inode);
1514         struct nfs4_opendata *opendata;
1515         int err;
1516
1517         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1518                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1519         if (IS_ERR(opendata))
1520                 return PTR_ERR(opendata);
1521         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1522         err = nfs4_open_recover(opendata, state);
1523         nfs4_opendata_put(opendata);
1524         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1525 }
1526
1527 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1528 {
1529         struct nfs4_opendata *data = calldata;
1530
1531         data->rpc_status = task->tk_status;
1532         if (data->rpc_status == 0) {
1533                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1534                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1535                 renew_lease(data->o_res.server, data->timestamp);
1536                 data->rpc_done = 1;
1537         }
1538 }
1539
1540 static void nfs4_open_confirm_release(void *calldata)
1541 {
1542         struct nfs4_opendata *data = calldata;
1543         struct nfs4_state *state = NULL;
1544
1545         /* If this request hasn't been cancelled, do nothing */
1546         if (data->cancelled == 0)
1547                 goto out_free;
1548         /* In case of error, no cleanup! */
1549         if (!data->rpc_done)
1550                 goto out_free;
1551         state = nfs4_opendata_to_nfs4_state(data);
1552         if (!IS_ERR(state))
1553                 nfs4_close_state(state, data->o_arg.fmode);
1554 out_free:
1555         nfs4_opendata_put(data);
1556 }
1557
1558 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1559         .rpc_call_done = nfs4_open_confirm_done,
1560         .rpc_release = nfs4_open_confirm_release,
1561 };
1562
1563 /*
1564  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1565  */
1566 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1567 {
1568         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1569         struct rpc_task *task;
1570         struct  rpc_message msg = {
1571                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1572                 .rpc_argp = &data->c_arg,
1573                 .rpc_resp = &data->c_res,
1574                 .rpc_cred = data->owner->so_cred,
1575         };
1576         struct rpc_task_setup task_setup_data = {
1577                 .rpc_client = server->client,
1578                 .rpc_message = &msg,
1579                 .callback_ops = &nfs4_open_confirm_ops,
1580                 .callback_data = data,
1581                 .workqueue = nfsiod_workqueue,
1582                 .flags = RPC_TASK_ASYNC,
1583         };
1584         int status;
1585
1586         kref_get(&data->kref);
1587         data->rpc_done = 0;
1588         data->rpc_status = 0;
1589         data->timestamp = jiffies;
1590         task = rpc_run_task(&task_setup_data);
1591         if (IS_ERR(task))
1592                 return PTR_ERR(task);
1593         status = nfs4_wait_for_completion_rpc_task(task);
1594         if (status != 0) {
1595                 data->cancelled = 1;
1596                 smp_wmb();
1597         } else
1598                 status = data->rpc_status;
1599         rpc_put_task(task);
1600         return status;
1601 }
1602
1603 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1604 {
1605         struct nfs4_opendata *data = calldata;
1606         struct nfs4_state_owner *sp = data->owner;
1607         struct nfs_client *clp = sp->so_server->nfs_client;
1608
1609         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1610                 goto out_wait;
1611         /*
1612          * Check if we still need to send an OPEN call, or if we can use
1613          * a delegation instead.
1614          */
1615         if (data->state != NULL) {
1616                 struct nfs_delegation *delegation;
1617
1618                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1619                         goto out_no_action;
1620                 rcu_read_lock();
1621                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1622                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1623                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1624                     can_open_delegated(delegation, data->o_arg.fmode))
1625                         goto unlock_no_action;
1626                 rcu_read_unlock();
1627         }
1628         /* Update client id. */
1629         data->o_arg.clientid = clp->cl_clientid;
1630         switch (data->o_arg.claim) {
1631         case NFS4_OPEN_CLAIM_PREVIOUS:
1632         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1633         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1634                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1635         case NFS4_OPEN_CLAIM_FH:
1636                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1637                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1638         }
1639         data->timestamp = jiffies;
1640         if (nfs4_setup_sequence(data->o_arg.server,
1641                                 &data->o_arg.seq_args,
1642                                 &data->o_res.seq_res,
1643                                 task) != 0)
1644                 nfs_release_seqid(data->o_arg.seqid);
1645
1646         /* Set the create mode (note dependency on the session type) */
1647         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1648         if (data->o_arg.open_flags & O_EXCL) {
1649                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1650                 if (nfs4_has_persistent_session(clp))
1651                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1652                 else if (clp->cl_mvops->minor_version > 0)
1653                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1654         }
1655         return;
1656 unlock_no_action:
1657         rcu_read_unlock();
1658 out_no_action:
1659         task->tk_action = NULL;
1660 out_wait:
1661         nfs4_sequence_done(task, &data->o_res.seq_res);
1662 }
1663
1664 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1665 {
1666         struct nfs4_opendata *data = calldata;
1667
1668         data->rpc_status = task->tk_status;
1669
1670         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1671                 return;
1672
1673         if (task->tk_status == 0) {
1674                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1675                         switch (data->o_res.f_attr->mode & S_IFMT) {
1676                         case S_IFREG:
1677                                 break;
1678                         case S_IFLNK:
1679                                 data->rpc_status = -ELOOP;
1680                                 break;
1681                         case S_IFDIR:
1682                                 data->rpc_status = -EISDIR;
1683                                 break;
1684                         default:
1685                                 data->rpc_status = -ENOTDIR;
1686                         }
1687                 }
1688                 renew_lease(data->o_res.server, data->timestamp);
1689                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1690                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1691         }
1692         data->rpc_done = 1;
1693 }
1694
1695 static void nfs4_open_release(void *calldata)
1696 {
1697         struct nfs4_opendata *data = calldata;
1698         struct nfs4_state *state = NULL;
1699
1700         /* If this request hasn't been cancelled, do nothing */
1701         if (data->cancelled == 0)
1702                 goto out_free;
1703         /* In case of error, no cleanup! */
1704         if (data->rpc_status != 0 || !data->rpc_done)
1705                 goto out_free;
1706         /* In case we need an open_confirm, no cleanup! */
1707         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1708                 goto out_free;
1709         state = nfs4_opendata_to_nfs4_state(data);
1710         if (!IS_ERR(state))
1711                 nfs4_close_state(state, data->o_arg.fmode);
1712 out_free:
1713         nfs4_opendata_put(data);
1714 }
1715
1716 static const struct rpc_call_ops nfs4_open_ops = {
1717         .rpc_call_prepare = nfs4_open_prepare,
1718         .rpc_call_done = nfs4_open_done,
1719         .rpc_release = nfs4_open_release,
1720 };
1721
1722 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1723 {
1724         struct inode *dir = data->dir->d_inode;
1725         struct nfs_server *server = NFS_SERVER(dir);
1726         struct nfs_openargs *o_arg = &data->o_arg;
1727         struct nfs_openres *o_res = &data->o_res;
1728         struct rpc_task *task;
1729         struct rpc_message msg = {
1730                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1731                 .rpc_argp = o_arg,
1732                 .rpc_resp = o_res,
1733                 .rpc_cred = data->owner->so_cred,
1734         };
1735         struct rpc_task_setup task_setup_data = {
1736                 .rpc_client = server->client,
1737                 .rpc_message = &msg,
1738                 .callback_ops = &nfs4_open_ops,
1739                 .callback_data = data,
1740                 .workqueue = nfsiod_workqueue,
1741                 .flags = RPC_TASK_ASYNC,
1742         };
1743         int status;
1744
1745         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1746         kref_get(&data->kref);
1747         data->rpc_done = 0;
1748         data->rpc_status = 0;
1749         data->cancelled = 0;
1750         data->is_recover = 0;
1751         if (isrecover) {
1752                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1753                 data->is_recover = 1;
1754         }
1755         task = rpc_run_task(&task_setup_data);
1756         if (IS_ERR(task))
1757                 return PTR_ERR(task);
1758         status = nfs4_wait_for_completion_rpc_task(task);
1759         if (status != 0) {
1760                 data->cancelled = 1;
1761                 smp_wmb();
1762         } else
1763                 status = data->rpc_status;
1764         rpc_put_task(task);
1765
1766         return status;
1767 }
1768
1769 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1770 {
1771         struct inode *dir = data->dir->d_inode;
1772         struct nfs_openres *o_res = &data->o_res;
1773         int status;
1774
1775         status = nfs4_run_open_task(data, 1);
1776         if (status != 0 || !data->rpc_done)
1777                 return status;
1778
1779         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1780
1781         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1782                 status = _nfs4_proc_open_confirm(data);
1783                 if (status != 0)
1784                         return status;
1785         }
1786
1787         return status;
1788 }
1789
1790 static int nfs4_opendata_access(struct rpc_cred *cred,
1791                                 struct nfs4_opendata *opendata,
1792                                 struct nfs4_state *state, fmode_t fmode,
1793                                 int openflags)
1794 {
1795         struct nfs_access_entry cache;
1796         u32 mask;
1797
1798         /* access call failed or for some reason the server doesn't
1799          * support any access modes -- defer access call until later */
1800         if (opendata->o_res.access_supported == 0)
1801                 return 0;
1802
1803         mask = 0;
1804         /* don't check MAY_WRITE - a newly created file may not have
1805          * write mode bits, but POSIX allows the creating process to write.
1806          * use openflags to check for exec, because fmode won't
1807          * always have FMODE_EXEC set when file open for exec. */
1808         if (openflags & __FMODE_EXEC) {
1809                 /* ONLY check for exec rights */
1810                 mask = MAY_EXEC;
1811         } else if (fmode & FMODE_READ)
1812                 mask = MAY_READ;
1813
1814         cache.cred = cred;
1815         cache.jiffies = jiffies;
1816         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1817         nfs_access_add_cache(state->inode, &cache);
1818
1819         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1820                 return 0;
1821
1822         /* even though OPEN succeeded, access is denied. Close the file */
1823         nfs4_close_state(state, fmode);
1824         return -EACCES;
1825 }
1826
1827 /*
1828  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1829  */
1830 static int _nfs4_proc_open(struct nfs4_opendata *data)
1831 {
1832         struct inode *dir = data->dir->d_inode;
1833         struct nfs_server *server = NFS_SERVER(dir);
1834         struct nfs_openargs *o_arg = &data->o_arg;
1835         struct nfs_openres *o_res = &data->o_res;
1836         int status;
1837
1838         status = nfs4_run_open_task(data, 0);
1839         if (!data->rpc_done)
1840                 return status;
1841         if (status != 0) {
1842                 if (status == -NFS4ERR_BADNAME &&
1843                                 !(o_arg->open_flags & O_CREAT))
1844                         return -ENOENT;
1845                 return status;
1846         }
1847
1848         nfs_fattr_map_and_free_names(server, &data->f_attr);
1849
1850         if (o_arg->open_flags & O_CREAT)
1851                 update_changeattr(dir, &o_res->cinfo);
1852         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1853                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1854         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1855                 status = _nfs4_proc_open_confirm(data);
1856                 if (status != 0)
1857                         return status;
1858         }
1859         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1860                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1861         return 0;
1862 }
1863
1864 static int nfs4_recover_expired_lease(struct nfs_server *server)
1865 {
1866         return nfs4_client_recover_expired_lease(server->nfs_client);
1867 }
1868
1869 /*
1870  * OPEN_EXPIRED:
1871  *      reclaim state on the server after a network partition.
1872  *      Assumes caller holds the appropriate lock
1873  */
1874 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1875 {
1876         struct nfs4_opendata *opendata;
1877         int ret;
1878
1879         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1880                         NFS4_OPEN_CLAIM_FH);
1881         if (IS_ERR(opendata))
1882                 return PTR_ERR(opendata);
1883         ret = nfs4_open_recover(opendata, state);
1884         if (ret == -ESTALE)
1885                 d_drop(ctx->dentry);
1886         nfs4_opendata_put(opendata);
1887         return ret;
1888 }
1889
1890 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1891 {
1892         struct nfs_server *server = NFS_SERVER(state->inode);
1893         struct nfs4_exception exception = { };
1894         int err;
1895
1896         do {
1897                 err = _nfs4_open_expired(ctx, state);
1898                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1899                         continue;
1900                 switch (err) {
1901                 default:
1902                         goto out;
1903                 case -NFS4ERR_GRACE:
1904                 case -NFS4ERR_DELAY:
1905                         nfs4_handle_exception(server, err, &exception);
1906                         err = 0;
1907                 }
1908         } while (exception.retry);
1909 out:
1910         return err;
1911 }
1912
1913 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1914 {
1915         struct nfs_open_context *ctx;
1916         int ret;
1917
1918         ctx = nfs4_state_find_open_context(state);
1919         if (IS_ERR(ctx))
1920                 return -EAGAIN;
1921         ret = nfs4_do_open_expired(ctx, state);
1922         put_nfs_open_context(ctx);
1923         return ret;
1924 }
1925
1926 #if defined(CONFIG_NFS_V4_1)
1927 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1928 {
1929         struct nfs_server *server = NFS_SERVER(state->inode);
1930         nfs4_stateid *stateid = &state->stateid;
1931         struct nfs_delegation *delegation;
1932         struct rpc_cred *cred = NULL;
1933         int status = -NFS4ERR_BAD_STATEID;
1934
1935         /* If a state reset has been done, test_stateid is unneeded */
1936         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1937                 return;
1938
1939         /* Get the delegation credential for use by test/free_stateid */
1940         rcu_read_lock();
1941         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1942         if (delegation != NULL &&
1943             nfs4_stateid_match(&delegation->stateid, stateid)) {
1944                 cred = get_rpccred(delegation->cred);
1945                 rcu_read_unlock();
1946                 status = nfs41_test_stateid(server, stateid, cred);
1947         } else
1948                 rcu_read_unlock();
1949
1950         if (status != NFS_OK) {
1951                 /* Free the stateid unless the server explicitly
1952                  * informs us the stateid is unrecognized. */
1953                 if (status != -NFS4ERR_BAD_STATEID)
1954                         nfs41_free_stateid(server, stateid, cred);
1955                 nfs_remove_bad_delegation(state->inode);
1956
1957                 write_seqlock(&state->seqlock);
1958                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1959                 write_sequnlock(&state->seqlock);
1960                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1961         }
1962
1963         if (cred != NULL)
1964                 put_rpccred(cred);
1965 }
1966
1967 /**
1968  * nfs41_check_open_stateid - possibly free an open stateid
1969  *
1970  * @state: NFSv4 state for an inode
1971  *
1972  * Returns NFS_OK if recovery for this stateid is now finished.
1973  * Otherwise a negative NFS4ERR value is returned.
1974  */
1975 static int nfs41_check_open_stateid(struct nfs4_state *state)
1976 {
1977         struct nfs_server *server = NFS_SERVER(state->inode);
1978         nfs4_stateid *stateid = &state->open_stateid;
1979         struct rpc_cred *cred = state->owner->so_cred;
1980         int status;
1981
1982         /* If a state reset has been done, test_stateid is unneeded */
1983         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1984             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1985             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1986                 return -NFS4ERR_BAD_STATEID;
1987
1988         status = nfs41_test_stateid(server, stateid, cred);
1989         if (status != NFS_OK) {
1990                 /* Free the stateid unless the server explicitly
1991                  * informs us the stateid is unrecognized. */
1992                 if (status != -NFS4ERR_BAD_STATEID)
1993                         nfs41_free_stateid(server, stateid, cred);
1994
1995                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1996                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1997                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1998                 clear_bit(NFS_OPEN_STATE, &state->flags);
1999         }
2000         return status;
2001 }
2002
2003 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2004 {
2005         int status;
2006
2007         nfs41_clear_delegation_stateid(state);
2008         status = nfs41_check_open_stateid(state);
2009         if (status != NFS_OK)
2010                 status = nfs4_open_expired(sp, state);
2011         return status;
2012 }
2013 #endif
2014
2015 /*
2016  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2017  * fields corresponding to attributes that were used to store the verifier.
2018  * Make sure we clobber those fields in the later setattr call
2019  */
2020 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2021 {
2022         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2023             !(sattr->ia_valid & ATTR_ATIME_SET))
2024                 sattr->ia_valid |= ATTR_ATIME;
2025
2026         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2027             !(sattr->ia_valid & ATTR_MTIME_SET))
2028                 sattr->ia_valid |= ATTR_MTIME;
2029 }
2030
2031 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2032                 fmode_t fmode,
2033                 int flags,
2034                 struct nfs_open_context *ctx)
2035 {
2036         struct nfs4_state_owner *sp = opendata->owner;
2037         struct nfs_server *server = sp->so_server;
2038         struct dentry *dentry;
2039         struct nfs4_state *state;
2040         unsigned int seq;
2041         int ret;
2042
2043         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2044
2045         ret = _nfs4_proc_open(opendata);
2046         if (ret != 0)
2047                 goto out;
2048
2049         state = nfs4_opendata_to_nfs4_state(opendata);
2050         ret = PTR_ERR(state);
2051         if (IS_ERR(state))
2052                 goto out;
2053         if (server->caps & NFS_CAP_POSIX_LOCK)
2054                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2055
2056         dentry = opendata->dentry;
2057         if (dentry->d_inode == NULL) {
2058                 /* FIXME: Is this d_drop() ever needed? */
2059                 d_drop(dentry);
2060                 dentry = d_add_unique(dentry, igrab(state->inode));
2061                 if (dentry == NULL) {
2062                         dentry = opendata->dentry;
2063                 } else if (dentry != ctx->dentry) {
2064                         dput(ctx->dentry);
2065                         ctx->dentry = dget(dentry);
2066                 }
2067                 nfs_set_verifier(dentry,
2068                                 nfs_save_change_attribute(opendata->dir->d_inode));
2069         }
2070
2071         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2072         if (ret != 0)
2073                 goto out;
2074
2075         ctx->state = state;
2076         if (dentry->d_inode == state->inode) {
2077                 nfs_inode_attach_open_context(ctx);
2078                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2079                         nfs4_schedule_stateid_recovery(server, state);
2080         }
2081 out:
2082         return ret;
2083 }
2084
2085 /*
2086  * Returns a referenced nfs4_state
2087  */
2088 static int _nfs4_do_open(struct inode *dir,
2089                         struct nfs_open_context *ctx,
2090                         int flags,
2091                         struct iattr *sattr,
2092                         struct nfs4_label *label)
2093 {
2094         struct nfs4_state_owner  *sp;
2095         struct nfs4_state     *state = NULL;
2096         struct nfs_server       *server = NFS_SERVER(dir);
2097         struct nfs4_opendata *opendata;
2098         struct dentry *dentry = ctx->dentry;
2099         struct rpc_cred *cred = ctx->cred;
2100         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2101         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2102         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2103         struct nfs4_label *olabel = NULL;
2104         int status;
2105
2106         /* Protect against reboot recovery conflicts */
2107         status = -ENOMEM;
2108         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2109         if (sp == NULL) {
2110                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2111                 goto out_err;
2112         }
2113         status = nfs4_recover_expired_lease(server);
2114         if (status != 0)
2115                 goto err_put_state_owner;
2116         if (dentry->d_inode != NULL)
2117                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2118         status = -ENOMEM;
2119         if (dentry->d_inode)
2120                 claim = NFS4_OPEN_CLAIM_FH;
2121         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2122                         label, claim, GFP_KERNEL);
2123         if (opendata == NULL)
2124                 goto err_put_state_owner;
2125
2126         if (label) {
2127                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2128                 if (IS_ERR(olabel)) {
2129                         status = PTR_ERR(olabel);
2130                         goto err_opendata_put;
2131                 }
2132         }
2133
2134         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2135                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2136                 if (!opendata->f_attr.mdsthreshold)
2137                         goto err_free_label;
2138                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2139         }
2140         if (dentry->d_inode != NULL)
2141                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2142
2143         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2144         if (status != 0)
2145                 goto err_free_label;
2146         state = ctx->state;
2147
2148         if ((opendata->o_arg.open_flags & O_EXCL) &&
2149             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2150                 nfs4_exclusive_attrset(opendata, sattr);
2151
2152                 nfs_fattr_init(opendata->o_res.f_attr);
2153                 status = nfs4_do_setattr(state->inode, cred,
2154                                 opendata->o_res.f_attr, sattr,
2155                                 state, label, olabel);
2156                 if (status == 0) {
2157                         nfs_setattr_update_inode(state->inode, sattr);
2158                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2159                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2160                 }
2161         }
2162
2163         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2164                 *ctx_th = opendata->f_attr.mdsthreshold;
2165         else
2166                 kfree(opendata->f_attr.mdsthreshold);
2167         opendata->f_attr.mdsthreshold = NULL;
2168
2169         nfs4_label_free(olabel);
2170
2171         nfs4_opendata_put(opendata);
2172         nfs4_put_state_owner(sp);
2173         return 0;
2174 err_free_label:
2175         nfs4_label_free(olabel);
2176 err_opendata_put:
2177         kfree(opendata->f_attr.mdsthreshold);
2178         nfs4_opendata_put(opendata);
2179 err_put_state_owner:
2180         nfs4_put_state_owner(sp);
2181 out_err:
2182         return status;
2183 }
2184
2185
2186 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2187                                         struct nfs_open_context *ctx,
2188                                         int flags,
2189                                         struct iattr *sattr,
2190                                         struct nfs4_label *label)
2191 {
2192         struct nfs_server *server = NFS_SERVER(dir);
2193         struct nfs4_exception exception = { };
2194         struct nfs4_state *res;
2195         int status;
2196
2197         do {
2198                 status = _nfs4_do_open(dir, ctx, flags, sattr, label);
2199                 res = ctx->state;
2200                 if (status == 0)
2201                         break;
2202                 /* NOTE: BAD_SEQID means the server and client disagree about the
2203                  * book-keeping w.r.t. state-changing operations
2204                  * (OPEN/CLOSE/LOCK/LOCKU...)
2205                  * It is actually a sign of a bug on the client or on the server.
2206                  *
2207                  * If we receive a BAD_SEQID error in the particular case of
2208                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2209                  * have unhashed the old state_owner for us, and that we can
2210                  * therefore safely retry using a new one. We should still warn
2211                  * the user though...
2212                  */
2213                 if (status == -NFS4ERR_BAD_SEQID) {
2214                         pr_warn_ratelimited("NFS: v4 server %s "
2215                                         " returned a bad sequence-id error!\n",
2216                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2217                         exception.retry = 1;
2218                         continue;
2219                 }
2220                 /*
2221                  * BAD_STATEID on OPEN means that the server cancelled our
2222                  * state before it received the OPEN_CONFIRM.
2223                  * Recover by retrying the request as per the discussion
2224                  * on Page 181 of RFC3530.
2225                  */
2226                 if (status == -NFS4ERR_BAD_STATEID) {
2227                         exception.retry = 1;
2228                         continue;
2229                 }
2230                 if (status == -EAGAIN) {
2231                         /* We must have found a delegation */
2232                         exception.retry = 1;
2233                         continue;
2234                 }
2235                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2236                         continue;
2237                 res = ERR_PTR(nfs4_handle_exception(server,
2238                                         status, &exception));
2239         } while (exception.retry);
2240         return res;
2241 }
2242
2243 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2244                             struct nfs_fattr *fattr, struct iattr *sattr,
2245                             struct nfs4_state *state, struct nfs4_label *ilabel,
2246                             struct nfs4_label *olabel)
2247 {
2248         struct nfs_server *server = NFS_SERVER(inode);
2249         struct nfs_setattrargs  arg = {
2250                 .fh             = NFS_FH(inode),
2251                 .iap            = sattr,
2252                 .server         = server,
2253                 .bitmask = server->attr_bitmask,
2254                 .label          = ilabel,
2255         };
2256         struct nfs_setattrres  res = {
2257                 .fattr          = fattr,
2258                 .label          = olabel,
2259                 .server         = server,
2260         };
2261         struct rpc_message msg = {
2262                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2263                 .rpc_argp       = &arg,
2264                 .rpc_resp       = &res,
2265                 .rpc_cred       = cred,
2266         };
2267         unsigned long timestamp = jiffies;
2268         fmode_t fmode;
2269         bool truncate;
2270         int status;
2271
2272         arg.bitmask = nfs4_bitmask(server, ilabel);
2273         if (ilabel)
2274                 arg.bitmask = nfs4_bitmask(server, olabel);
2275
2276         nfs_fattr_init(fattr);
2277
2278         /* Servers should only apply open mode checks for file size changes */
2279         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2280         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2281
2282         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2283                 /* Use that stateid */
2284         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2285                 struct nfs_lockowner lockowner = {
2286                         .l_owner = current->files,
2287                         .l_pid = current->tgid,
2288                 };
2289                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2290                                 &lockowner);
2291         } else
2292                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2293
2294         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2295         if (status == 0 && state != NULL)
2296                 renew_lease(server, timestamp);
2297         return status;
2298 }
2299
2300 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2301                            struct nfs_fattr *fattr, struct iattr *sattr,
2302                            struct nfs4_state *state, struct nfs4_label *ilabel,
2303                            struct nfs4_label *olabel)
2304 {
2305         struct nfs_server *server = NFS_SERVER(inode);
2306         struct nfs4_exception exception = {
2307                 .state = state,
2308                 .inode = inode,
2309         };
2310         int err;
2311         do {
2312                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2313                 switch (err) {
2314                 case -NFS4ERR_OPENMODE:
2315                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2316                                 pr_warn_once("NFSv4: server %s is incorrectly "
2317                                                 "applying open mode checks to "
2318                                                 "a SETATTR that is not "
2319                                                 "changing file size.\n",
2320                                                 server->nfs_client->cl_hostname);
2321                         }
2322                         if (state && !(state->state & FMODE_WRITE)) {
2323                                 err = -EBADF;
2324                                 if (sattr->ia_valid & ATTR_OPEN)
2325                                         err = -EACCES;
2326                                 goto out;
2327                         }
2328                 }
2329                 err = nfs4_handle_exception(server, err, &exception);
2330         } while (exception.retry);
2331 out:
2332         return err;
2333 }
2334
2335 struct nfs4_closedata {
2336         struct inode *inode;
2337         struct nfs4_state *state;
2338         struct nfs_closeargs arg;
2339         struct nfs_closeres res;
2340         struct nfs_fattr fattr;
2341         unsigned long timestamp;
2342         bool roc;
2343         u32 roc_barrier;
2344 };
2345
2346 static void nfs4_free_closedata(void *data)
2347 {
2348         struct nfs4_closedata *calldata = data;
2349         struct nfs4_state_owner *sp = calldata->state->owner;
2350         struct super_block *sb = calldata->state->inode->i_sb;
2351
2352         if (calldata->roc)
2353                 pnfs_roc_release(calldata->state->inode);
2354         nfs4_put_open_state(calldata->state);
2355         nfs_free_seqid(calldata->arg.seqid);
2356         nfs4_put_state_owner(sp);
2357         nfs_sb_deactive(sb);
2358         kfree(calldata);
2359 }
2360
2361 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2362                 fmode_t fmode)
2363 {
2364         spin_lock(&state->owner->so_lock);
2365         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2366         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2367         case FMODE_WRITE:
2368                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2369                 break;
2370         case FMODE_READ:
2371                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2372                 break;
2373         case 0:
2374                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2375                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2376                 clear_bit(NFS_OPEN_STATE, &state->flags);
2377         }
2378         spin_unlock(&state->owner->so_lock);
2379 }
2380
2381 static void nfs4_close_done(struct rpc_task *task, void *data)
2382 {
2383         struct nfs4_closedata *calldata = data;
2384         struct nfs4_state *state = calldata->state;
2385         struct nfs_server *server = NFS_SERVER(calldata->inode);
2386
2387         dprintk("%s: begin!\n", __func__);
2388         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2389                 return;
2390         /* hmm. we are done with the inode, and in the process of freeing
2391          * the state_owner. we keep this around to process errors
2392          */
2393         switch (task->tk_status) {
2394                 case 0:
2395                         if (calldata->roc)
2396                                 pnfs_roc_set_barrier(state->inode,
2397                                                      calldata->roc_barrier);
2398                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2399                         renew_lease(server, calldata->timestamp);
2400                         nfs4_close_clear_stateid_flags(state,
2401                                         calldata->arg.fmode);
2402                         break;
2403                 case -NFS4ERR_STALE_STATEID:
2404                 case -NFS4ERR_OLD_STATEID:
2405                 case -NFS4ERR_BAD_STATEID:
2406                 case -NFS4ERR_EXPIRED:
2407                         if (calldata->arg.fmode == 0)
2408                                 break;
2409                 default:
2410                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2411                                 rpc_restart_call_prepare(task);
2412         }
2413         nfs_release_seqid(calldata->arg.seqid);
2414         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2415         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2416 }
2417
2418 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2419 {
2420         struct nfs4_closedata *calldata = data;
2421         struct nfs4_state *state = calldata->state;
2422         struct inode *inode = calldata->inode;
2423         int call_close = 0;
2424
2425         dprintk("%s: begin!\n", __func__);
2426         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2427                 goto out_wait;
2428
2429         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2430         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2431         spin_lock(&state->owner->so_lock);
2432         /* Calculate the change in open mode */
2433         if (state->n_rdwr == 0) {
2434                 if (state->n_rdonly == 0) {
2435                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2436                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2437                         calldata->arg.fmode &= ~FMODE_READ;
2438                 }
2439                 if (state->n_wronly == 0) {
2440                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2441                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2442                         calldata->arg.fmode &= ~FMODE_WRITE;
2443                 }
2444         }
2445         if (!nfs4_valid_open_stateid(state))
2446                 call_close = 0;
2447         spin_unlock(&state->owner->so_lock);
2448
2449         if (!call_close) {
2450                 /* Note: exit _without_ calling nfs4_close_done */
2451                 goto out_no_action;
2452         }
2453
2454         if (calldata->arg.fmode == 0) {
2455                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2456                 if (calldata->roc &&
2457                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2458                         nfs_release_seqid(calldata->arg.seqid);
2459                         goto out_wait;
2460                     }
2461         }
2462
2463         nfs_fattr_init(calldata->res.fattr);
2464         calldata->timestamp = jiffies;
2465         if (nfs4_setup_sequence(NFS_SERVER(inode),
2466                                 &calldata->arg.seq_args,
2467                                 &calldata->res.seq_res,
2468                                 task) != 0)
2469                 nfs_release_seqid(calldata->arg.seqid);
2470         dprintk("%s: done!\n", __func__);
2471         return;
2472 out_no_action:
2473         task->tk_action = NULL;
2474 out_wait:
2475         nfs4_sequence_done(task, &calldata->res.seq_res);
2476 }
2477
2478 static const struct rpc_call_ops nfs4_close_ops = {
2479         .rpc_call_prepare = nfs4_close_prepare,
2480         .rpc_call_done = nfs4_close_done,
2481         .rpc_release = nfs4_free_closedata,
2482 };
2483
2484 /*
2485  * It is possible for data to be read/written from a mem-mapped file
2486  * after the sys_close call (which hits the vfs layer as a flush).
2487  * This means that we can't safely call nfsv4 close on a file until
2488  * the inode is cleared. This in turn means that we are not good
2489  * NFSv4 citizens - we do not indicate to the server to update the file's
2490  * share state even when we are done with one of the three share
2491  * stateid's in the inode.
2492  *
2493  * NOTE: Caller must be holding the sp->so_owner semaphore!
2494  */
2495 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2496 {
2497         struct nfs_server *server = NFS_SERVER(state->inode);
2498         struct nfs4_closedata *calldata;
2499         struct nfs4_state_owner *sp = state->owner;
2500         struct rpc_task *task;
2501         struct rpc_message msg = {
2502                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2503                 .rpc_cred = state->owner->so_cred,
2504         };
2505         struct rpc_task_setup task_setup_data = {
2506                 .rpc_client = server->client,
2507                 .rpc_message = &msg,
2508                 .callback_ops = &nfs4_close_ops,
2509                 .workqueue = nfsiod_workqueue,
2510                 .flags = RPC_TASK_ASYNC,
2511         };
2512         int status = -ENOMEM;
2513
2514         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2515         if (calldata == NULL)
2516                 goto out;
2517         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2518         calldata->inode = state->inode;
2519         calldata->state = state;
2520         calldata->arg.fh = NFS_FH(state->inode);
2521         calldata->arg.stateid = &state->open_stateid;
2522         /* Serialization for the sequence id */
2523         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2524         if (calldata->arg.seqid == NULL)
2525                 goto out_free_calldata;
2526         calldata->arg.fmode = 0;
2527         calldata->arg.bitmask = server->cache_consistency_bitmask;
2528         calldata->res.fattr = &calldata->fattr;
2529         calldata->res.seqid = calldata->arg.seqid;
2530         calldata->res.server = server;
2531         calldata->roc = pnfs_roc(state->inode);
2532         nfs_sb_active(calldata->inode->i_sb);
2533
2534         msg.rpc_argp = &calldata->arg;
2535         msg.rpc_resp = &calldata->res;
2536         task_setup_data.callback_data = calldata;
2537         task = rpc_run_task(&task_setup_data);
2538         if (IS_ERR(task))
2539                 return PTR_ERR(task);
2540         status = 0;
2541         if (wait)
2542                 status = rpc_wait_for_completion_task(task);
2543         rpc_put_task(task);
2544         return status;
2545 out_free_calldata:
2546         kfree(calldata);
2547 out:
2548         nfs4_put_open_state(state);
2549         nfs4_put_state_owner(sp);
2550         return status;
2551 }
2552
2553 static struct inode *
2554 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2555 {
2556         struct nfs4_state *state;
2557         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2558
2559         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2560
2561         /* Protect against concurrent sillydeletes */
2562         state = nfs4_do_open(dir, ctx, open_flags, attr, label);
2563
2564         nfs4_label_release_security(label);
2565
2566         if (IS_ERR(state))
2567                 return ERR_CAST(state);
2568         return state->inode;
2569 }
2570
2571 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2572 {
2573         if (ctx->state == NULL)
2574                 return;
2575         if (is_sync)
2576                 nfs4_close_sync(ctx->state, ctx->mode);
2577         else
2578                 nfs4_close_state(ctx->state, ctx->mode);
2579 }
2580
2581 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2582 {
2583         struct nfs4_server_caps_arg args = {
2584                 .fhandle = fhandle,
2585         };
2586         struct nfs4_server_caps_res res = {};
2587         struct rpc_message msg = {
2588                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2589                 .rpc_argp = &args,
2590                 .rpc_resp = &res,
2591         };
2592         int status;
2593
2594         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2595         if (status == 0) {
2596                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2597                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2598                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2599                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2600                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2601                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2602                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2603                         server->caps |= NFS_CAP_ACLS;
2604                 if (res.has_links != 0)
2605                         server->caps |= NFS_CAP_HARDLINKS;
2606                 if (res.has_symlinks != 0)
2607                         server->caps |= NFS_CAP_SYMLINKS;
2608                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2609                         server->caps |= NFS_CAP_FILEID;
2610                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2611                         server->caps |= NFS_CAP_MODE;
2612                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2613                         server->caps |= NFS_CAP_NLINK;
2614                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2615                         server->caps |= NFS_CAP_OWNER;
2616                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2617                         server->caps |= NFS_CAP_OWNER_GROUP;
2618                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2619                         server->caps |= NFS_CAP_ATIME;
2620                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2621                         server->caps |= NFS_CAP_CTIME;
2622                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2623                         server->caps |= NFS_CAP_MTIME;
2624 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2625                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2626                         server->caps |= NFS_CAP_SECURITY_LABEL;
2627 #endif
2628                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2629                                 sizeof(server->attr_bitmask));
2630
2631                 if (server->caps & NFS_CAP_SECURITY_LABEL) {
2632                         server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2633                         res.attr_bitmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2634                 }
2635                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2636                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2637                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2638                 server->acl_bitmask = res.acl_bitmask;
2639                 server->fh_expire_type = res.fh_expire_type;
2640         }
2641
2642         return status;
2643 }
2644
2645 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2646 {
2647         struct nfs4_exception exception = { };
2648         int err;
2649         do {
2650                 err = nfs4_handle_exception(server,
2651                                 _nfs4_server_capabilities(server, fhandle),
2652                                 &exception);
2653         } while (exception.retry);
2654         return err;
2655 }
2656
2657 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2658                 struct nfs_fsinfo *info)
2659 {
2660         u32 bitmask[3];
2661         struct nfs4_lookup_root_arg args = {
2662                 .bitmask = bitmask,
2663         };
2664         struct nfs4_lookup_res res = {
2665                 .server = server,
2666                 .fattr = info->fattr,
2667                 .fh = fhandle,
2668         };
2669         struct rpc_message msg = {
2670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2671                 .rpc_argp = &args,
2672                 .rpc_resp = &res,
2673         };
2674
2675         bitmask[0] = nfs4_fattr_bitmap[0];
2676         bitmask[1] = nfs4_fattr_bitmap[1];
2677         /*
2678          * Process the label in the upcoming getfattr
2679          */
2680         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2681
2682         nfs_fattr_init(info->fattr);
2683         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2684 }
2685
2686 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2687                 struct nfs_fsinfo *info)
2688 {
2689         struct nfs4_exception exception = { };
2690         int err;
2691         do {
2692                 err = _nfs4_lookup_root(server, fhandle, info);
2693                 switch (err) {
2694                 case 0:
2695                 case -NFS4ERR_WRONGSEC:
2696                         goto out;
2697                 default:
2698                         err = nfs4_handle_exception(server, err, &exception);
2699                 }
2700         } while (exception.retry);
2701 out:
2702         return err;
2703 }
2704
2705 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2706                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2707 {
2708         struct rpc_auth *auth;
2709         int ret;
2710
2711         auth = rpcauth_create(flavor, server->client);
2712         if (IS_ERR(auth)) {
2713                 ret = -EACCES;
2714                 goto out;
2715         }
2716         ret = nfs4_lookup_root(server, fhandle, info);
2717 out:
2718         return ret;
2719 }
2720
2721 /*
2722  * Retry pseudoroot lookup with various security flavors.  We do this when:
2723  *
2724  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2725  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2726  *
2727  * Returns zero on success, or a negative NFS4ERR value, or a
2728  * negative errno value.
2729  */
2730 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2731                               struct nfs_fsinfo *info)
2732 {
2733         /* Per 3530bis 15.33.5 */
2734         static const rpc_authflavor_t flav_array[] = {
2735                 RPC_AUTH_GSS_KRB5P,
2736                 RPC_AUTH_GSS_KRB5I,
2737                 RPC_AUTH_GSS_KRB5,
2738                 RPC_AUTH_UNIX,                  /* courtesy */
2739                 RPC_AUTH_NULL,
2740         };
2741         int status = -EPERM;
2742         size_t i;
2743
2744         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2745                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2746                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2747                         continue;
2748                 break;
2749         }
2750
2751         /*
2752          * -EACCESS could mean that the user doesn't have correct permissions
2753          * to access the mount.  It could also mean that we tried to mount
2754          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2755          * existing mount programs don't handle -EACCES very well so it should
2756          * be mapped to -EPERM instead.
2757          */
2758         if (status == -EACCES)
2759                 status = -EPERM;
2760         return status;
2761 }
2762
2763 static int nfs4_do_find_root_sec(struct nfs_server *server,
2764                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2765 {
2766         int mv = server->nfs_client->cl_minorversion;
2767         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2768 }
2769
2770 /**
2771  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2772  * @server: initialized nfs_server handle
2773  * @fhandle: we fill in the pseudo-fs root file handle
2774  * @info: we fill in an FSINFO struct
2775  *
2776  * Returns zero on success, or a negative errno.
2777  */
2778 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2779                          struct nfs_fsinfo *info)
2780 {
2781         int status;
2782
2783         status = nfs4_lookup_root(server, fhandle, info);
2784         if ((status == -NFS4ERR_WRONGSEC) &&
2785             !(server->flags & NFS_MOUNT_SECFLAVOUR))
2786                 status = nfs4_do_find_root_sec(server, fhandle, info);
2787
2788         if (status == 0)
2789                 status = nfs4_server_capabilities(server, fhandle);
2790         if (status == 0)
2791                 status = nfs4_do_fsinfo(server, fhandle, info);
2792
2793         return nfs4_map_errors(status);
2794 }
2795
2796 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2797                               struct nfs_fsinfo *info)
2798 {
2799         int error;
2800         struct nfs_fattr *fattr = info->fattr;
2801         struct nfs4_label *label = NULL;
2802
2803         error = nfs4_server_capabilities(server, mntfh);
2804         if (error < 0) {
2805                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2806                 return error;
2807         }
2808
2809         label = nfs4_label_alloc(server, GFP_KERNEL);
2810         if (IS_ERR(label))
2811                 return PTR_ERR(label);
2812
2813         error = nfs4_proc_getattr(server, mntfh, fattr, label);
2814         if (error < 0) {
2815                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2816                 goto err_free_label;
2817         }
2818
2819         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2820             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2821                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2822
2823 err_free_label:
2824         nfs4_label_free(label);
2825
2826         return error;
2827 }
2828
2829 /*
2830  * Get locations and (maybe) other attributes of a referral.
2831  * Note that we'll actually follow the referral later when
2832  * we detect fsid mismatch in inode revalidation
2833  */
2834 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2835                              const struct qstr *name, struct nfs_fattr *fattr,
2836                              struct nfs_fh *fhandle)
2837 {
2838         int status = -ENOMEM;
2839         struct page *page = NULL;
2840         struct nfs4_fs_locations *locations = NULL;
2841
2842         page = alloc_page(GFP_KERNEL);
2843         if (page == NULL)
2844                 goto out;
2845         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2846         if (locations == NULL)
2847                 goto out;
2848
2849         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2850         if (status != 0)
2851                 goto out;
2852         /* Make sure server returned a different fsid for the referral */
2853         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2854                 dprintk("%s: server did not return a different fsid for"
2855                         " a referral at %s\n", __func__, name->name);
2856                 status = -EIO;
2857                 goto out;
2858         }
2859         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2860         nfs_fixup_referral_attributes(&locations->fattr);
2861
2862         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2863         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2864         memset(fhandle, 0, sizeof(struct nfs_fh));
2865 out:
2866         if (page)
2867                 __free_page(page);
2868         kfree(locations);
2869         return status;
2870 }
2871
2872 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
2873                                 struct nfs_fattr *fattr, struct nfs4_label *label)
2874 {
2875         struct nfs4_getattr_arg args = {
2876                 .fh = fhandle,
2877                 .bitmask = server->attr_bitmask,
2878         };
2879         struct nfs4_getattr_res res = {
2880                 .fattr = fattr,
2881                 .label = label,
2882                 .server = server,
2883         };
2884         struct rpc_message msg = {
2885                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2886                 .rpc_argp = &args,
2887                 .rpc_resp = &res,
2888         };
2889
2890         args.bitmask = nfs4_bitmask(server, label);
2891
2892         nfs_fattr_init(fattr);
2893         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2894 }
2895
2896 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
2897                                 struct nfs_fattr *fattr, struct nfs4_label *label)
2898 {
2899         struct nfs4_exception exception = { };
2900         int err;
2901         do {
2902                 err = nfs4_handle_exception(server,
2903                                 _nfs4_proc_getattr(server, fhandle, fattr, label),
2904                                 &exception);
2905         } while (exception.retry);
2906         return err;
2907 }
2908
2909 /*
2910  * The file is not closed if it is opened due to the a request to change
2911  * the size of the file. The open call will not be needed once the
2912  * VFS layer lookup-intents are implemented.
2913  *
2914  * Close is called when the inode is destroyed.
2915  * If we haven't opened the file for O_WRONLY, we
2916  * need to in the size_change case to obtain a stateid.
2917  *
2918  * Got race?
2919  * Because OPEN is always done by name in nfsv4, it is
2920  * possible that we opened a different file by the same
2921  * name.  We can recognize this race condition, but we
2922  * can't do anything about it besides returning an error.
2923  *
2924  * This will be fixed with VFS changes (lookup-intent).
2925  */
2926 static int
2927 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2928                   struct iattr *sattr)
2929 {
2930         struct inode *inode = dentry->d_inode;
2931         struct rpc_cred *cred = NULL;
2932         struct nfs4_state *state = NULL;
2933         struct nfs4_label *label = NULL;
2934         int status;
2935
2936         if (pnfs_ld_layoutret_on_setattr(inode))
2937                 pnfs_commit_and_return_layout(inode);
2938
2939         nfs_fattr_init(fattr);
2940
2941         /* Deal with open(O_TRUNC) */
2942         if (sattr->ia_valid & ATTR_OPEN)
2943                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
2944
2945         /* Optimization: if the end result is no change, don't RPC */
2946         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
2947                 return 0;
2948
2949         /* Search for an existing open(O_WRITE) file */
2950         if (sattr->ia_valid & ATTR_FILE) {
2951                 struct nfs_open_context *ctx;
2952
2953                 ctx = nfs_file_open_context(sattr->ia_file);
2954                 if (ctx) {
2955                         cred = ctx->cred;
2956                         state = ctx->state;
2957                 }
2958         }
2959
2960         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
2961         if (IS_ERR(label))
2962                 return PTR_ERR(label);
2963
2964         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
2965         if (status == 0) {
2966                 nfs_setattr_update_inode(inode, sattr);
2967                 nfs_setsecurity(inode, fattr, label);
2968         }
2969         nfs4_label_free(label);
2970         return status;
2971 }
2972
2973 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2974                 const struct qstr *name, struct nfs_fh *fhandle,
2975                 struct nfs_fattr *fattr, struct nfs4_label *label)
2976 {
2977         struct nfs_server *server = NFS_SERVER(dir);
2978         int                    status;
2979         struct nfs4_lookup_arg args = {
2980                 .bitmask = server->attr_bitmask,
2981                 .dir_fh = NFS_FH(dir),
2982                 .name = name,
2983         };
2984         struct nfs4_lookup_res res = {
2985                 .server = server,
2986                 .fattr = fattr,
2987                 .label = label,
2988                 .fh = fhandle,
2989         };
2990         struct rpc_message msg = {
2991                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2992                 .rpc_argp = &args,
2993                 .rpc_resp = &res,
2994         };
2995
2996         args.bitmask = nfs4_bitmask(server, label);
2997
2998         nfs_fattr_init(fattr);
2999
3000         dprintk("NFS call  lookup %s\n", name->name);
3001         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3002         dprintk("NFS reply lookup: %d\n", status);
3003         return status;
3004 }
3005
3006 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3007 {
3008         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3009                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3010         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3011         fattr->nlink = 2;
3012 }
3013
3014 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3015                                    struct qstr *name, struct nfs_fh *fhandle,
3016                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3017 {
3018         struct nfs4_exception exception = { };
3019         struct rpc_clnt *client = *clnt;
3020         int err;
3021         do {
3022                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3023                 switch (err) {
3024                 case -NFS4ERR_BADNAME:
3025                         err = -ENOENT;
3026                         goto out;
3027                 case -NFS4ERR_MOVED:
3028                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3029                         goto out;
3030                 case -NFS4ERR_WRONGSEC:
3031                         err = -EPERM;
3032                         if (client != *clnt)
3033                                 goto out;
3034
3035                         client = nfs4_create_sec_client(client, dir, name);
3036                         if (IS_ERR(client))
3037                                 return PTR_ERR(client);
3038
3039                         exception.retry = 1;
3040                         break;
3041                 default:
3042                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3043                 }
3044         } while (exception.retry);
3045
3046 out:
3047         if (err == 0)
3048                 *clnt = client;
3049         else if (client != *clnt)
3050                 rpc_shutdown_client(client);
3051
3052         return err;
3053 }
3054
3055 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3056                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3057                             struct nfs4_label *label)
3058 {
3059         int status;
3060         struct rpc_clnt *client = NFS_CLIENT(dir);
3061
3062         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3063         if (client != NFS_CLIENT(dir)) {
3064                 rpc_shutdown_client(client);
3065                 nfs_fixup_secinfo_attributes(fattr);
3066         }
3067         return status;
3068 }
3069
3070 struct rpc_clnt *
3071 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3072                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3073 {
3074         int status;
3075         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
3076
3077         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3078         if (status < 0) {
3079                 rpc_shutdown_client(client);
3080                 return ERR_PTR(status);
3081         }
3082         return client;
3083 }
3084
3085 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3086 {
3087         struct nfs_server *server = NFS_SERVER(inode);
3088         struct nfs4_accessargs args = {
3089                 .fh = NFS_FH(inode),
3090                 .bitmask = server->cache_consistency_bitmask,
3091         };
3092         struct nfs4_accessres res = {
3093                 .server = server,
3094         };
3095         struct rpc_message msg = {
3096                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3097                 .rpc_argp = &args,
3098                 .rpc_resp = &res,
3099                 .rpc_cred = entry->cred,
3100         };
3101         int mode = entry->mask;
3102         int status = 0;
3103
3104         /*
3105          * Determine which access bits we want to ask for...
3106          */
3107         if (mode & MAY_READ)
3108                 args.access |= NFS4_ACCESS_READ;
3109         if (S_ISDIR(inode->i_mode)) {
3110                 if (mode & MAY_WRITE)
3111                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3112                 if (mode & MAY_EXEC)
3113                         args.access |= NFS4_ACCESS_LOOKUP;
3114         } else {
3115                 if (mode & MAY_WRITE)
3116                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3117                 if (mode & MAY_EXEC)
3118                         args.access |= NFS4_ACCESS_EXECUTE;
3119         }
3120
3121         res.fattr = nfs_alloc_fattr();
3122         if (res.fattr == NULL)
3123                 return -ENOMEM;
3124
3125         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3126         if (!status) {
3127                 nfs_access_set_mask(entry, res.access);
3128                 nfs_refresh_inode(inode, res.fattr);
3129         }
3130         nfs_free_fattr(res.fattr);
3131         return status;
3132 }
3133
3134 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3135 {
3136         struct nfs4_exception exception = { };
3137         int err;
3138         do {
3139                 err = nfs4_handle_exception(NFS_SERVER(inode),
3140                                 _nfs4_proc_access(inode, entry),
3141                                 &exception);
3142         } while (exception.retry);
3143         return err;
3144 }
3145
3146 /*
3147  * TODO: For the time being, we don't try to get any attributes
3148  * along with any of the zero-copy operations READ, READDIR,
3149  * READLINK, WRITE.
3150  *
3151  * In the case of the first three, we want to put the GETATTR
3152  * after the read-type operation -- this is because it is hard
3153  * to predict the length of a GETATTR response in v4, and thus
3154  * align the READ data correctly.  This means that the GETATTR
3155  * may end up partially falling into the page cache, and we should
3156  * shift it into the 'tail' of the xdr_buf before processing.
3157  * To do this efficiently, we need to know the total length
3158  * of data received, which doesn't seem to be available outside
3159  * of the RPC layer.
3160  *
3161  * In the case of WRITE, we also want to put the GETATTR after
3162  * the operation -- in this case because we want to make sure
3163  * we get the post-operation mtime and size.
3164  *
3165  * Both of these changes to the XDR layer would in fact be quite
3166  * minor, but I decided to leave them for a subsequent patch.
3167  */
3168 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3169                 unsigned int pgbase, unsigned int pglen)
3170 {
3171         struct nfs4_readlink args = {
3172                 .fh       = NFS_FH(inode),
3173                 .pgbase   = pgbase,
3174                 .pglen    = pglen,
3175                 .pages    = &page,
3176         };
3177         struct nfs4_readlink_res res;
3178         struct rpc_message msg = {
3179                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3180                 .rpc_argp = &args,
3181                 .rpc_resp = &res,
3182         };
3183
3184         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3185 }
3186
3187 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3188                 unsigned int pgbase, unsigned int pglen)
3189 {
3190         struct nfs4_exception exception = { };
3191         int err;
3192         do {
3193                 err = nfs4_handle_exception(NFS_SERVER(inode),
3194                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
3195                                 &exception);
3196         } while (exception.retry);
3197         return err;
3198 }
3199
3200 /*
3201  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3202  */
3203 static int
3204 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3205                  int flags)
3206 {
3207         struct nfs4_label l, *ilabel = NULL;
3208         struct nfs_open_context *ctx;
3209         struct nfs4_state *state;
3210         int status = 0;
3211
3212         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3213         if (IS_ERR(ctx))
3214                 return PTR_ERR(ctx);
3215
3216         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3217
3218         sattr->ia_mode &= ~current_umask();
3219         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel);
3220         if (IS_ERR(state)) {
3221                 status = PTR_ERR(state);
3222                 goto out;
3223         }
3224 out:
3225         nfs4_label_release_security(ilabel);
3226         put_nfs_open_context(ctx);
3227         return status;
3228 }
3229
3230 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3231 {
3232         struct nfs_server *server = NFS_SERVER(dir);
3233         struct nfs_removeargs args = {
3234                 .fh = NFS_FH(dir),
3235                 .name = *name,
3236         };
3237         struct nfs_removeres res = {
3238                 .server = server,
3239         };
3240         struct rpc_message msg = {
3241                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3242                 .rpc_argp = &args,
3243                 .rpc_resp = &res,
3244         };
3245         int status;
3246
3247         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3248         if (status == 0)
3249                 update_changeattr(dir, &res.cinfo);
3250         return status;
3251 }
3252
3253 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3254 {
3255         struct nfs4_exception exception = { };
3256         int err;
3257         do {
3258                 err = nfs4_handle_exception(NFS_SERVER(dir),
3259                                 _nfs4_proc_remove(dir, name),
3260                                 &exception);
3261         } while (exception.retry);
3262         return err;
3263 }
3264
3265 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3266 {
3267         struct nfs_server *server = NFS_SERVER(dir);
3268         struct nfs_removeargs *args = msg->rpc_argp;
3269         struct nfs_removeres *res = msg->rpc_resp;
3270
3271         res->server = server;
3272         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3273         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3274
3275         nfs_fattr_init(res->dir_attr);
3276 }
3277
3278 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3279 {
3280         nfs4_setup_sequence(NFS_SERVER(data->dir),
3281                         &data->args.seq_args,
3282                         &data->res.seq_res,
3283                         task);
3284 }
3285
3286 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3287 {
3288         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3289
3290         if (!nfs4_sequence_done(task, &res->seq_res))
3291                 return 0;
3292         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3293                 return 0;
3294         update_changeattr(dir, &res->cinfo);
3295         return 1;
3296 }
3297
3298 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3299 {
3300         struct nfs_server *server = NFS_SERVER(dir);
3301         struct nfs_renameargs *arg = msg->rpc_argp;
3302         struct nfs_renameres *res = msg->rpc_resp;
3303
3304         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3305         res->server = server;
3306         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3307 }
3308
3309 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3310 {
3311         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3312                         &data->args.seq_args,
3313                         &data->res.seq_res,
3314                         task);
3315 }
3316
3317 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3318                                  struct inode *new_dir)
3319 {
3320         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3321
3322         if (!nfs4_sequence_done(task, &res->seq_res))
3323                 return 0;
3324         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3325                 return 0;
3326
3327         update_changeattr(old_dir, &res->old_cinfo);
3328         update_changeattr(new_dir, &res->new_cinfo);
3329         return 1;
3330 }
3331
3332 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3333                 struct inode *new_dir, struct qstr *new_name)
3334 {
3335         struct nfs_server *server = NFS_SERVER(old_dir);
3336         struct nfs_renameargs arg = {
3337                 .old_dir = NFS_FH(old_dir),
3338                 .new_dir = NFS_FH(new_dir),
3339                 .old_name = old_name,
3340                 .new_name = new_name,
3341         };
3342         struct nfs_renameres res = {
3343                 .server = server,
3344         };
3345         struct rpc_message msg = {
3346                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3347                 .rpc_argp = &arg,
3348                 .rpc_resp = &res,
3349         };
3350         int status = -ENOMEM;
3351
3352         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3353         if (!status) {
3354                 update_changeattr(old_dir, &res.old_cinfo);
3355                 update_changeattr(new_dir, &res.new_cinfo);
3356         }
3357         return status;
3358 }
3359
3360 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3361                 struct inode *new_dir, struct qstr *new_name)
3362 {
3363         struct nfs4_exception exception = { };
3364         int err;
3365         do {
3366                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3367                                 _nfs4_proc_rename(old_dir, old_name,
3368                                         new_dir, new_name),
3369                                 &exception);
3370         } while (exception.retry);
3371         return err;
3372 }
3373
3374 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3375 {
3376         struct nfs_server *server = NFS_SERVER(inode);
3377         struct nfs4_link_arg arg = {
3378                 .fh     = NFS_FH(inode),
3379                 .dir_fh = NFS_FH(dir),
3380                 .name   = name,
3381                 .bitmask = server->attr_bitmask,
3382         };
3383         struct nfs4_link_res res = {
3384                 .server = server,
3385                 .label = NULL,
3386         };
3387         struct rpc_message msg = {
3388                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3389                 .rpc_argp = &arg,
3390                 .rpc_resp = &res,
3391         };
3392         int status = -ENOMEM;
3393
3394         res.fattr = nfs_alloc_fattr();
3395         if (res.fattr == NULL)
3396                 goto out;
3397
3398         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3399         if (IS_ERR(res.label)) {
3400                 status = PTR_ERR(res.label);
3401                 goto out;
3402         }
3403         arg.bitmask = nfs4_bitmask(server, res.label);
3404
3405         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3406         if (!status) {
3407                 update_changeattr(dir, &res.cinfo);
3408                 status = nfs_post_op_update_inode(inode, res.fattr);
3409                 if (!status)
3410                         nfs_setsecurity(inode, res.fattr, res.label);
3411         }
3412
3413
3414         nfs4_label_free(res.label);
3415
3416 out:
3417         nfs_free_fattr(res.fattr);
3418         return status;
3419 }
3420
3421 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3422 {
3423         struct nfs4_exception exception = { };
3424         int err;
3425         do {
3426                 err = nfs4_handle_exception(NFS_SERVER(inode),
3427                                 _nfs4_proc_link(inode, dir, name),
3428                                 &exception);
3429         } while (exception.retry);
3430         return err;
3431 }
3432
3433 struct nfs4_createdata {
3434         struct rpc_message msg;
3435         struct nfs4_create_arg arg;
3436         struct nfs4_create_res res;
3437         struct nfs_fh fh;
3438         struct nfs_fattr fattr;
3439         struct nfs4_label *label;
3440 };
3441
3442 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3443                 struct qstr *name, struct iattr *sattr, u32 ftype)
3444 {
3445         struct nfs4_createdata *data;
3446
3447         data = kzalloc(sizeof(*data), GFP_KERNEL);
3448         if (data != NULL) {
3449                 struct nfs_server *server = NFS_SERVER(dir);
3450
3451                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3452                 if (IS_ERR(data->label))
3453                         goto out_free;
3454
3455                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3456                 data->msg.rpc_argp = &data->arg;
3457                 data->msg.rpc_resp = &data->res;
3458                 data->arg.dir_fh = NFS_FH(dir);
3459                 data->arg.server = server;
3460                 data->arg.name = name;
3461                 data->arg.attrs = sattr;
3462                 data->arg.ftype = ftype;
3463                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3464                 data->res.server = server;
3465                 data->res.fh = &data->fh;
3466                 data->res.fattr = &data->fattr;
3467                 data->res.label = data->label;
3468                 nfs_fattr_init(data->res.fattr);
3469         }
3470         return data;
3471 out_free:
3472         kfree(data);
3473         return NULL;
3474 }
3475
3476 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3477 {
3478         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3479                                     &data->arg.seq_args, &data->res.seq_res, 1);
3480         if (status == 0) {
3481                 update_changeattr(dir, &data->res.dir_cinfo);
3482                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3483         }
3484         return status;
3485 }
3486
3487 static void nfs4_free_createdata(struct nfs4_createdata *data)
3488 {
3489         nfs4_label_free(data->label);
3490         kfree(data);
3491 }
3492
3493 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3494                 struct page *page, unsigned int len, struct iattr *sattr,
3495                 struct nfs4_label *label)
3496 {
3497         struct nfs4_createdata *data;
3498         int status = -ENAMETOOLONG;
3499
3500         if (len > NFS4_MAXPATHLEN)
3501                 goto out;
3502
3503         status = -ENOMEM;
3504         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3505         if (data == NULL)
3506                 goto out;
3507
3508         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3509         data->arg.u.symlink.pages = &page;
3510         data->arg.u.symlink.len = len;
3511         data->arg.label = label;
3512
3513         status = nfs4_do_create(dir, dentry, data);
3514
3515         nfs4_free_createdata(data);
3516 out:
3517         return status;
3518 }
3519
3520 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3521                 struct page *page, unsigned int len, struct iattr *sattr)
3522 {
3523         struct nfs4_exception exception = { };
3524         struct nfs4_label l, *label = NULL;
3525         int err;
3526
3527         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3528
3529         do {
3530                 err = nfs4_handle_exception(NFS_SERVER(dir),
3531                                 _nfs4_proc_symlink(dir, dentry, page,
3532                                                         len, sattr, label),
3533                                 &exception);
3534         } while (exception.retry);
3535
3536         nfs4_label_release_security(label);
3537         return err;
3538 }
3539
3540 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3541                 struct iattr *sattr, struct nfs4_label *label)
3542 {
3543         struct nfs4_createdata *data;
3544         int status = -ENOMEM;
3545
3546         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3547         if (data == NULL)
3548                 goto out;
3549
3550         data->arg.label = label;
3551         status = nfs4_do_create(dir, dentry, data);
3552
3553         nfs4_free_createdata(data);
3554 out:
3555         return status;
3556 }
3557
3558 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3559                 struct iattr *sattr)
3560 {
3561         struct nfs4_exception exception = { };
3562         struct nfs4_label l, *label = NULL;
3563         int err;
3564
3565         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3566
3567         sattr->ia_mode &= ~current_umask();
3568         do {
3569                 err = nfs4_handle_exception(NFS_SERVER(dir),
3570                                 _nfs4_proc_mkdir(dir, dentry, sattr, label),
3571                                 &exception);
3572         } while (exception.retry);
3573         nfs4_label_release_security(label);
3574
3575         return err;
3576 }
3577
3578 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3579                 u64 cookie, struct page **pages, unsigned int count, int plus)
3580 {
3581         struct inode            *dir = dentry->d_inode;
3582         struct nfs4_readdir_arg args = {
3583                 .fh = NFS_FH(dir),
3584                 .pages = pages,
3585                 .pgbase = 0,
3586                 .count = count,
3587                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3588                 .plus = plus,
3589         };
3590         struct nfs4_readdir_res res;
3591         struct rpc_message msg = {
3592                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3593                 .rpc_argp = &args,
3594                 .rpc_resp = &res,
3595                 .rpc_cred = cred,
3596         };
3597         int                     status;
3598
3599         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3600                         dentry->d_parent->d_name.name,
3601                         dentry->d_name.name,
3602                         (unsigned long long)cookie);
3603         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3604         res.pgbase = args.pgbase;
3605         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3606         if (status >= 0) {
3607                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3608                 status += args.pgbase;
3609         }
3610
3611         nfs_invalidate_atime(dir);
3612
3613         dprintk("%s: returns %d\n", __func__, status);
3614         return status;
3615 }
3616
3617 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3618                 u64 cookie, struct page **pages, unsigned int count, int plus)
3619 {
3620         struct nfs4_exception exception = { };
3621         int err;
3622         do {
3623                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3624                                 _nfs4_proc_readdir(dentry, cred, cookie,
3625                                         pages, count, plus),
3626                                 &exception);
3627         } while (exception.retry);
3628         return err;
3629 }
3630
3631 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3632                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3633 {
3634         struct nfs4_createdata *data;
3635         int mode = sattr->ia_mode;
3636         int status = -ENOMEM;
3637
3638         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3639         if (data == NULL)
3640                 goto out;
3641
3642         if (S_ISFIFO(mode))
3643                 data->arg.ftype = NF4FIFO;
3644         else if (S_ISBLK(mode)) {
3645                 data->arg.ftype = NF4BLK;
3646                 data->arg.u.device.specdata1 = MAJOR(rdev);
3647                 data->arg.u.device.specdata2 = MINOR(rdev);
3648         }
3649         else if (S_ISCHR(mode)) {
3650                 data->arg.ftype = NF4CHR;
3651                 data->arg.u.device.specdata1 = MAJOR(rdev);
3652                 data->arg.u.device.specdata2 = MINOR(rdev);
3653         } else if (!S_ISSOCK(mode)) {
3654                 status = -EINVAL;
3655                 goto out_free;
3656         }
3657
3658         data->arg.label = label;
3659         status = nfs4_do_create(dir, dentry, data);
3660 out_free:
3661         nfs4_free_createdata(data);
3662 out:
3663         return status;
3664 }
3665
3666 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3667                 struct iattr *sattr, dev_t rdev)
3668 {
3669         struct nfs4_exception exception = { };
3670         struct nfs4_label l, *label = NULL;
3671         int err;
3672
3673         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3674
3675         sattr->ia_mode &= ~current_umask();
3676         do {
3677                 err = nfs4_handle_exception(NFS_SERVER(dir),
3678                                 _nfs4_proc_mknod(dir, dentry, sattr, label, rdev),
3679                                 &exception);
3680         } while (exception.retry);
3681
3682         nfs4_label_release_security(label);
3683
3684         return err;
3685 }
3686
3687 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3688                  struct nfs_fsstat *fsstat)
3689 {
3690         struct nfs4_statfs_arg args = {
3691                 .fh = fhandle,
3692                 .bitmask = server->attr_bitmask,
3693         };
3694         struct nfs4_statfs_res res = {
3695                 .fsstat = fsstat,
3696         };
3697         struct rpc_message msg = {
3698                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3699                 .rpc_argp = &args,
3700                 .rpc_resp = &res,
3701         };
3702
3703         nfs_fattr_init(fsstat->fattr);
3704         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3705 }
3706
3707 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3708 {
3709         struct nfs4_exception exception = { };
3710         int err;
3711         do {
3712                 err = nfs4_handle_exception(server,
3713                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3714                                 &exception);
3715         } while (exception.retry);
3716         return err;
3717 }
3718
3719 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3720                 struct nfs_fsinfo *fsinfo)
3721 {
3722         struct nfs4_fsinfo_arg args = {
3723                 .fh = fhandle,
3724                 .bitmask = server->attr_bitmask,
3725         };
3726         struct nfs4_fsinfo_res res = {
3727                 .fsinfo = fsinfo,
3728         };
3729         struct rpc_message msg = {
3730                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3731                 .rpc_argp = &args,
3732                 .rpc_resp = &res,
3733         };
3734
3735         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3736 }
3737
3738 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3739 {
3740         struct nfs4_exception exception = { };
3741         unsigned long now = jiffies;
3742         int err;
3743
3744         do {
3745                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3746                 if (err == 0) {
3747                         struct nfs_client *clp = server->nfs_client;
3748
3749                         spin_lock(&clp->cl_lock);
3750                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3751                         clp->cl_last_renewal = now;
3752                         spin_unlock(&clp->cl_lock);
3753                         break;
3754                 }
3755                 err = nfs4_handle_exception(server, err, &exception);
3756         } while (exception.retry);
3757         return err;
3758 }
3759
3760 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3761 {
3762         int error;
3763
3764         nfs_fattr_init(fsinfo->fattr);
3765         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3766         if (error == 0) {
3767                 /* block layout checks this! */
3768                 server->pnfs_blksize = fsinfo->blksize;
3769                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3770         }
3771
3772         return error;
3773 }
3774
3775 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3776                 struct nfs_pathconf *pathconf)
3777 {
3778         struct nfs4_pathconf_arg args = {
3779                 .fh = fhandle,
3780                 .bitmask = server->attr_bitmask,
3781         };
3782         struct nfs4_pathconf_res res = {
3783                 .pathconf = pathconf,
3784         };
3785         struct rpc_message msg = {
3786                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3787                 .rpc_argp = &args,
3788                 .rpc_resp = &res,
3789         };
3790
3791         /* None of the pathconf attributes are mandatory to implement */
3792         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3793                 memset(pathconf, 0, sizeof(*pathconf));
3794                 return 0;
3795         }
3796
3797         nfs_fattr_init(pathconf->fattr);
3798         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3799 }
3800
3801 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3802                 struct nfs_pathconf *pathconf)
3803 {
3804         struct nfs4_exception exception = { };
3805         int err;
3806
3807         do {
3808                 err = nfs4_handle_exception(server,
3809                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3810                                 &exception);
3811         } while (exception.retry);
3812         return err;
3813 }
3814
3815 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3816                 const struct nfs_open_context *ctx,
3817                 const struct nfs_lock_context *l_ctx,
3818                 fmode_t fmode)
3819 {
3820         const struct nfs_lockowner *lockowner = NULL;
3821
3822         if (l_ctx != NULL)
3823                 lockowner = &l_ctx->lockowner;
3824         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3825 }
3826 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3827
3828 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3829                 const struct nfs_open_context *ctx,
3830                 const struct nfs_lock_context *l_ctx,
3831                 fmode_t fmode)
3832 {
3833         nfs4_stateid current_stateid;
3834
3835         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3836                 return false;
3837         return nfs4_stateid_match(stateid, &current_stateid);
3838 }
3839
3840 static bool nfs4_error_stateid_expired(int err)
3841 {
3842         switch (err) {
3843         case -NFS4ERR_DELEG_REVOKED:
3844         case -NFS4ERR_ADMIN_REVOKED:
3845         case -NFS4ERR_BAD_STATEID:
3846         case -NFS4ERR_STALE_STATEID:
3847         case -NFS4ERR_OLD_STATEID:
3848         case -NFS4ERR_OPENMODE:
3849         case -NFS4ERR_EXPIRED:
3850                 return true;
3851         }
3852         return false;
3853 }
3854
3855 void __nfs4_read_done_cb(struct nfs_read_data *data)
3856 {
3857         nfs_invalidate_atime(data->header->inode);
3858 }
3859
3860 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3861 {
3862         struct nfs_server *server = NFS_SERVER(data->header->inode);
3863
3864         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3865                 rpc_restart_call_prepare(task);
3866                 return -EAGAIN;
3867         }
3868
3869         __nfs4_read_done_cb(data);
3870         if (task->tk_status > 0)
3871                 renew_lease(server, data->timestamp);
3872         return 0;
3873 }
3874
3875 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3876                 struct nfs_readargs *args)
3877 {
3878
3879         if (!nfs4_error_stateid_expired(task->tk_status) ||
3880                 nfs4_stateid_is_current(&args->stateid,
3881                                 args->context,
3882                                 args->lock_context,
3883                                 FMODE_READ))
3884                 return false;
3885         rpc_restart_call_prepare(task);
3886         return true;
3887 }
3888
3889 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3890 {
3891
3892         dprintk("--> %s\n", __func__);
3893
3894         if (!nfs4_sequence_done(task, &data->res.seq_res))
3895                 return -EAGAIN;
3896         if (nfs4_read_stateid_changed(task, &data->args))
3897                 return -EAGAIN;
3898         return data->read_done_cb ? data->read_done_cb(task, data) :
3899                                     nfs4_read_done_cb(task, data);
3900 }
3901
3902 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3903 {
3904         data->timestamp   = jiffies;
3905         data->read_done_cb = nfs4_read_done_cb;
3906         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3907         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3908 }
3909
3910 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3911 {
3912         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3913                         &data->args.seq_args,
3914                         &data->res.seq_res,
3915                         task))
3916                 return;
3917         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3918                         data->args.lock_context, FMODE_READ);
3919 }
3920
3921 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3922 {
3923         struct inode *inode = data->header->inode;
3924
3925         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3926                 rpc_restart_call_prepare(task);
3927                 return -EAGAIN;
3928         }
3929         if (task->tk_status >= 0) {
3930                 renew_lease(NFS_SERVER(inode), data->timestamp);
3931                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3932         }
3933         return 0;
3934 }
3935
3936 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3937                 struct nfs_writeargs *args)
3938 {
3939
3940         if (!nfs4_error_stateid_expired(task->tk_status) ||
3941                 nfs4_stateid_is_current(&args->stateid,
3942                                 args->context,
3943                                 args->lock_context,
3944                                 FMODE_WRITE))
3945                 return false;
3946         rpc_restart_call_prepare(task);
3947         return true;
3948 }
3949
3950 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3951 {
3952         if (!nfs4_sequence_done(task, &data->res.seq_res))
3953                 return -EAGAIN;
3954         if (nfs4_write_stateid_changed(task, &data->args))
3955                 return -EAGAIN;
3956         return data->write_done_cb ? data->write_done_cb(task, data) :
3957                 nfs4_write_done_cb(task, data);
3958 }
3959
3960 static
3961 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3962 {
3963         const struct nfs_pgio_header *hdr = data->header;
3964
3965         /* Don't request attributes for pNFS or O_DIRECT writes */
3966         if (data->ds_clp != NULL || hdr->dreq != NULL)
3967                 return false;
3968         /* Otherwise, request attributes if and only if we don't hold
3969          * a delegation
3970          */
3971         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3972 }
3973
3974 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3975 {
3976         struct nfs_server *server = NFS_SERVER(data->header->inode);
3977
3978         if (!nfs4_write_need_cache_consistency_data(data)) {
3979                 data->args.bitmask = NULL;
3980                 data->res.fattr = NULL;
3981         } else
3982                 data->args.bitmask = server->cache_consistency_bitmask;
3983
3984         if (!data->write_done_cb)
3985                 data->write_done_cb = nfs4_write_done_cb;
3986         data->res.server = server;
3987         data->timestamp   = jiffies;
3988
3989         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3990         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3991 }
3992
3993 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3994 {
3995         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3996                         &data->args.seq_args,
3997                         &data->res.seq_res,
3998                         task))
3999                 return;
4000         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4001                         data->args.lock_context, FMODE_WRITE);
4002 }
4003
4004 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4005 {
4006         nfs4_setup_sequence(NFS_SERVER(data->inode),
4007                         &data->args.seq_args,
4008                         &data->res.seq_res,
4009                         task);
4010 }
4011
4012 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4013 {
4014         struct inode *inode = data->inode;
4015
4016         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4017                 rpc_restart_call_prepare(task);
4018                 return -EAGAIN;
4019         }
4020         return 0;
4021 }
4022
4023 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4024 {
4025         if (!nfs4_sequence_done(task, &data->res.seq_res))
4026                 return -EAGAIN;
4027         return data->commit_done_cb(task, data);
4028 }
4029
4030 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4031 {
4032         struct nfs_server *server = NFS_SERVER(data->inode);
4033
4034         if (data->commit_done_cb == NULL)
4035                 data->commit_done_cb = nfs4_commit_done_cb;
4036         data->res.server = server;
4037         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4038         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4039 }
4040
4041 struct nfs4_renewdata {
4042         struct nfs_client       *client;
4043         unsigned long           timestamp;
4044 };
4045
4046 /*
4047  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4048  * standalone procedure for queueing an asynchronous RENEW.
4049  */
4050 static void nfs4_renew_release(void *calldata)
4051 {
4052         struct nfs4_renewdata *data = calldata;
4053         struct nfs_client *clp = data->client;
4054
4055         if (atomic_read(&clp->cl_count) > 1)
4056                 nfs4_schedule_state_renewal(clp);
4057         nfs_put_client(clp);
4058         kfree(data);
4059 }
4060
4061 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4062 {
4063         struct nfs4_renewdata *data = calldata;
4064         struct nfs_client *clp = data->client;
4065         unsigned long timestamp = data->timestamp;
4066
4067         if (task->tk_status < 0) {
4068                 /* Unless we're shutting down, schedule state recovery! */
4069                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4070                         return;
4071                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4072                         nfs4_schedule_lease_recovery(clp);
4073                         return;
4074                 }
4075                 nfs4_schedule_path_down_recovery(clp);
4076         }
4077         do_renew_lease(clp, timestamp);
4078 }
4079
4080 static const struct rpc_call_ops nfs4_renew_ops = {
4081         .rpc_call_done = nfs4_renew_done,
4082         .rpc_release = nfs4_renew_release,
4083 };
4084
4085 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4086 {
4087         struct rpc_message msg = {
4088                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4089                 .rpc_argp       = clp,
4090                 .rpc_cred       = cred,
4091         };
4092         struct nfs4_renewdata *data;
4093
4094         if (renew_flags == 0)
4095                 return 0;
4096         if (!atomic_inc_not_zero(&clp->cl_count))
4097                 return -EIO;
4098         data = kmalloc(sizeof(*data), GFP_NOFS);
4099         if (data == NULL)
4100                 return -ENOMEM;
4101         data->client = clp;
4102         data->timestamp = jiffies;
4103         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4104                         &nfs4_renew_ops, data);
4105 }
4106
4107 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4108 {
4109         struct rpc_message msg = {
4110                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4111                 .rpc_argp       = clp,
4112                 .rpc_cred       = cred,
4113         };
4114         unsigned long now = jiffies;
4115         int status;
4116
4117         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4118         if (status < 0)
4119                 return status;
4120         do_renew_lease(clp, now);
4121         return 0;
4122 }
4123
4124 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4125 {
4126         return (server->caps & NFS_CAP_ACLS)
4127                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4128                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4129 }
4130
4131 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4132  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4133  * the stack.
4134  */
4135 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4136
4137 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4138                 struct page **pages, unsigned int *pgbase)
4139 {
4140         struct page *newpage, **spages;
4141         int rc = 0;
4142         size_t len;
4143         spages = pages;
4144
4145         do {
4146                 len = min_t(size_t, PAGE_SIZE, buflen);
4147                 newpage = alloc_page(GFP_KERNEL);
4148
4149                 if (newpage == NULL)
4150                         goto unwind;
4151                 memcpy(page_address(newpage), buf, len);
4152                 buf += len;
4153                 buflen -= len;
4154                 *pages++ = newpage;
4155                 rc++;
4156         } while (buflen != 0);
4157
4158         return rc;
4159
4160 unwind:
4161         for(; rc > 0; rc--)
4162                 __free_page(spages[rc-1]);
4163         return -ENOMEM;
4164 }
4165
4166 struct nfs4_cached_acl {
4167         int cached;
4168         size_t len;
4169         char data[0];
4170 };
4171
4172 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4173 {
4174         struct nfs_inode *nfsi = NFS_I(inode);
4175
4176         spin_lock(&inode->i_lock);
4177         kfree(nfsi->nfs4_acl);
4178         nfsi->nfs4_acl = acl;
4179         spin_unlock(&inode->i_lock);
4180 }
4181
4182 static void nfs4_zap_acl_attr(struct inode *inode)
4183 {
4184         nfs4_set_cached_acl(inode, NULL);
4185 }
4186
4187 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4188 {
4189         struct nfs_inode *nfsi = NFS_I(inode);
4190         struct nfs4_cached_acl *acl;
4191         int ret = -ENOENT;
4192
4193         spin_lock(&inode->i_lock);
4194         acl = nfsi->nfs4_acl;
4195         if (acl == NULL)
4196                 goto out;
4197         if (buf == NULL) /* user is just asking for length */
4198                 goto out_len;
4199         if (acl->cached == 0)
4200                 goto out;
4201         ret = -ERANGE; /* see getxattr(2) man page */
4202         if (acl->len > buflen)
4203                 goto out;
4204         memcpy(buf, acl->data, acl->len);
4205 out_len:
4206         ret = acl->len;
4207 out:
4208         spin_unlock(&inode->i_lock);
4209         return ret;
4210 }
4211
4212 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4213 {
4214         struct nfs4_cached_acl *acl;
4215         size_t buflen = sizeof(*acl) + acl_len;
4216
4217         if (buflen <= PAGE_SIZE) {
4218                 acl = kmalloc(buflen, GFP_KERNEL);
4219                 if (acl == NULL)
4220                         goto out;
4221                 acl->cached = 1;
4222                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4223         } else {
4224                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4225                 if (acl == NULL)
4226                         goto out;
4227                 acl->cached = 0;
4228         }
4229         acl->len = acl_len;
4230 out:
4231         nfs4_set_cached_acl(inode, acl);
4232 }
4233
4234 /*
4235  * The getxattr API returns the required buffer length when called with a
4236  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4237  * the required buf.  On a NULL buf, we send a page of data to the server
4238  * guessing that the ACL request can be serviced by a page. If so, we cache
4239  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4240  * the cache. If not so, we throw away the page, and cache the required
4241  * length. The next getxattr call will then produce another round trip to
4242  * the server, this time with the input buf of the required size.
4243  */
4244 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4245 {
4246         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4247         struct nfs_getaclargs args = {
4248                 .fh = NFS_FH(inode),
4249                 .acl_pages = pages,
4250                 .acl_len = buflen,
4251         };
4252         struct nfs_getaclres res = {
4253                 .acl_len = buflen,
4254         };
4255         struct rpc_message msg = {
4256                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4257                 .rpc_argp = &args,
4258                 .rpc_resp = &res,
4259         };
4260         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4261         int ret = -ENOMEM, i;
4262
4263         /* As long as we're doing a round trip to the server anyway,
4264          * let's be prepared for a page of acl data. */
4265         if (npages == 0)
4266                 npages = 1;
4267         if (npages > ARRAY_SIZE(pages))
4268                 return -ERANGE;
4269
4270         for (i = 0; i < npages; i++) {
4271                 pages[i] = alloc_page(GFP_KERNEL);
4272                 if (!pages[i])
4273                         goto out_free;
4274         }
4275
4276         /* for decoding across pages */
4277         res.acl_scratch = alloc_page(GFP_KERNEL);
4278         if (!res.acl_scratch)
4279                 goto out_free;
4280
4281         args.acl_len = npages * PAGE_SIZE;
4282         args.acl_pgbase = 0;
4283
4284         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4285                 __func__, buf, buflen, npages, args.acl_len);
4286         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4287                              &msg, &args.seq_args, &res.seq_res, 0);
4288         if (ret)
4289                 goto out_free;
4290
4291         /* Handle the case where the passed-in buffer is too short */
4292         if (res.acl_flags & NFS4_ACL_TRUNC) {
4293                 /* Did the user only issue a request for the acl length? */
4294                 if (buf == NULL)
4295                         goto out_ok;
4296                 ret = -ERANGE;
4297                 goto out_free;
4298         }
4299         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4300         if (buf) {
4301                 if (res.acl_len > buflen) {
4302                         ret = -ERANGE;
4303                         goto out_free;
4304                 }
4305                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4306         }
4307 out_ok:
4308         ret = res.acl_len;
4309 out_free:
4310         for (i = 0; i < npages; i++)
4311                 if (pages[i])
4312                         __free_page(pages[i]);
4313         if (res.acl_scratch)
4314                 __free_page(res.acl_scratch);
4315         return ret;
4316 }
4317
4318 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4319 {
4320         struct nfs4_exception exception = { };
4321         ssize_t ret;
4322         do {
4323                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4324                 if (ret >= 0)
4325                         break;
4326                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4327         } while (exception.retry);
4328         return ret;
4329 }
4330
4331 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4332 {
4333         struct nfs_server *server = NFS_SERVER(inode);
4334         int ret;
4335
4336         if (!nfs4_server_supports_acls(server))
4337                 return -EOPNOTSUPP;
4338         ret = nfs_revalidate_inode(server, inode);
4339         if (ret < 0)
4340                 return ret;
4341         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4342                 nfs_zap_acl_cache(inode);
4343         ret = nfs4_read_cached_acl(inode, buf, buflen);
4344         if (ret != -ENOENT)
4345                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4346                  * but no cached acl data, just the acl length */
4347                 return ret;
4348         return nfs4_get_acl_uncached(inode, buf, buflen);
4349 }
4350
4351 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4352 {
4353         struct nfs_server *server = NFS_SERVER(inode);
4354         struct page *pages[NFS4ACL_MAXPAGES];
4355         struct nfs_setaclargs arg = {
4356                 .fh             = NFS_FH(inode),
4357                 .acl_pages      = pages,
4358                 .acl_len        = buflen,
4359         };
4360         struct nfs_setaclres res;
4361         struct rpc_message msg = {
4362                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4363                 .rpc_argp       = &arg,
4364                 .rpc_resp       = &res,
4365         };
4366         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4367         int ret, i;
4368
4369         if (!nfs4_server_supports_acls(server))
4370                 return -EOPNOTSUPP;
4371         if (npages > ARRAY_SIZE(pages))
4372                 return -ERANGE;
4373         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4374         if (i < 0)
4375                 return i;
4376         nfs4_inode_return_delegation(inode);
4377         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4378
4379         /*
4380          * Free each page after tx, so the only ref left is
4381          * held by the network stack
4382          */
4383         for (; i > 0; i--)
4384                 put_page(pages[i-1]);
4385
4386         /*
4387          * Acl update can result in inode attribute update.
4388          * so mark the attribute cache invalid.
4389          */
4390         spin_lock(&inode->i_lock);
4391         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4392         spin_unlock(&inode->i_lock);
4393         nfs_access_zap_cache(inode);
4394         nfs_zap_acl_cache(inode);
4395         return ret;
4396 }
4397
4398 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4399 {
4400         struct nfs4_exception exception = { };
4401         int err;
4402         do {
4403                 err = nfs4_handle_exception(NFS_SERVER(inode),
4404                                 __nfs4_proc_set_acl(inode, buf, buflen),
4405                                 &exception);
4406         } while (exception.retry);
4407         return err;
4408 }
4409
4410 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4411 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4412                                         size_t buflen)
4413 {
4414         struct nfs_server *server = NFS_SERVER(inode);
4415         struct nfs_fattr fattr;
4416         struct nfs4_label label = {0, 0, buflen, buf};
4417
4418         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4419         struct nfs4_getattr_arg args = {
4420                 .fh             = NFS_FH(inode),
4421                 .bitmask        = bitmask,
4422         };
4423         struct nfs4_getattr_res res = {
4424                 .fattr          = &fattr,
4425                 .label          = &label,
4426                 .server         = server,
4427         };
4428         struct rpc_message msg = {
4429                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4430                 .rpc_argp       = &args,
4431                 .rpc_resp       = &res,
4432         };
4433         int ret;
4434
4435         nfs_fattr_init(&fattr);
4436
4437         ret = rpc_call_sync(server->client, &msg, 0);
4438         if (ret)
4439                 return ret;
4440         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4441                 return -ENOENT;
4442         if (buflen < label.len)
4443                 return -ERANGE;
4444         return 0;
4445 }
4446
4447 static int nfs4_get_security_label(struct inode *inode, void *buf,
4448                                         size_t buflen)
4449 {
4450         struct nfs4_exception exception = { };
4451         int err;
4452
4453         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4454                 return -EOPNOTSUPP;
4455
4456         do {
4457                 err = nfs4_handle_exception(NFS_SERVER(inode),
4458                                 _nfs4_get_security_label(inode, buf, buflen),
4459                                 &exception);
4460         } while (exception.retry);
4461         return err;
4462 }
4463
4464 static int _nfs4_do_set_security_label(struct inode *inode,
4465                 struct nfs4_label *ilabel,
4466                 struct nfs_fattr *fattr,
4467                 struct nfs4_label *olabel)
4468 {
4469
4470         struct iattr sattr = {0};
4471         struct nfs_server *server = NFS_SERVER(inode);
4472         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4473         struct nfs_setattrargs args = {
4474                 .fh             = NFS_FH(inode),
4475                 .iap            = &sattr,
4476                 .server         = server,
4477                 .bitmask        = bitmask,
4478                 .label          = ilabel,
4479         };
4480         struct nfs_setattrres res = {
4481                 .fattr          = fattr,
4482                 .label          = olabel,
4483                 .server         = server,
4484         };
4485         struct rpc_message msg = {
4486                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4487                 .rpc_argp       = &args,
4488                 .rpc_resp       = &res,
4489         };
4490         int status;
4491
4492         nfs4_stateid_copy(&args.stateid, &zero_stateid);
4493
4494         status = rpc_call_sync(server->client, &msg, 0);
4495         if (status)
4496                 dprintk("%s failed: %d\n", __func__, status);
4497
4498         return status;
4499 }
4500
4501 static int nfs4_do_set_security_label(struct inode *inode,
4502                 struct nfs4_label *ilabel,
4503                 struct nfs_fattr *fattr,
4504                 struct nfs4_label *olabel)
4505 {
4506         struct nfs4_exception exception = { };
4507         int err;
4508
4509         do {
4510                 err = nfs4_handle_exception(NFS_SERVER(inode),
4511                                 _nfs4_do_set_security_label(inode, ilabel,
4512                                 fattr, olabel),
4513                                 &exception);
4514         } while (exception.retry);
4515         return err;
4516 }
4517
4518 static int
4519 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4520 {
4521         struct nfs4_label ilabel, *olabel = NULL;
4522         struct nfs_fattr fattr;
4523         struct rpc_cred *cred;
4524         struct inode *inode = dentry->d_inode;
4525         int status;
4526
4527         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4528                 return -EOPNOTSUPP;
4529
4530         nfs_fattr_init(&fattr);
4531
4532         ilabel.pi = 0;
4533         ilabel.lfs = 0;
4534         ilabel.label = (char *)buf;
4535         ilabel.len = buflen;
4536
4537         cred = rpc_lookup_cred();
4538         if (IS_ERR(cred))
4539                 return PTR_ERR(cred);
4540
4541         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4542         if (IS_ERR(olabel)) {
4543                 status = -PTR_ERR(olabel);
4544                 goto out;
4545         }
4546
4547         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4548         if (status == 0)
4549                 nfs_setsecurity(inode, &fattr, olabel);
4550
4551         nfs4_label_free(olabel);
4552 out:
4553         put_rpccred(cred);
4554         return status;
4555 }
4556 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4557
4558
4559 static int
4560 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4561 {
4562         struct nfs_client *clp = server->nfs_client;
4563
4564         if (task->tk_status >= 0)
4565                 return 0;
4566         switch(task->tk_status) {
4567                 case -NFS4ERR_DELEG_REVOKED:
4568                 case -NFS4ERR_ADMIN_REVOKED:
4569                 case -NFS4ERR_BAD_STATEID:
4570                         if (state == NULL)
4571                                 break;
4572                         nfs_remove_bad_delegation(state->inode);
4573                 case -NFS4ERR_OPENMODE:
4574                         if (state == NULL)
4575                                 break;
4576                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4577                                 goto stateid_invalid;
4578                         goto wait_on_recovery;
4579                 case -NFS4ERR_EXPIRED:
4580                         if (state != NULL) {
4581                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4582                                         goto stateid_invalid;
4583                         }
4584                 case -NFS4ERR_STALE_STATEID:
4585                 case -NFS4ERR_STALE_CLIENTID:
4586                         nfs4_schedule_lease_recovery(clp);
4587                         goto wait_on_recovery;
4588 #if defined(CONFIG_NFS_V4_1)
4589                 case -NFS4ERR_BADSESSION:
4590                 case -NFS4ERR_BADSLOT:
4591                 case -NFS4ERR_BAD_HIGH_SLOT:
4592                 case -NFS4ERR_DEADSESSION:
4593                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4594                 case -NFS4ERR_SEQ_FALSE_RETRY:
4595                 case -NFS4ERR_SEQ_MISORDERED:
4596                         dprintk("%s ERROR %d, Reset session\n", __func__,
4597                                 task->tk_status);
4598                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4599                         task->tk_status = 0;
4600                         return -EAGAIN;
4601 #endif /* CONFIG_NFS_V4_1 */
4602                 case -NFS4ERR_DELAY:
4603                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4604                 case -NFS4ERR_GRACE:
4605                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4606                         task->tk_status = 0;
4607                         return -EAGAIN;
4608                 case -NFS4ERR_RETRY_UNCACHED_REP:
4609                 case -NFS4ERR_OLD_STATEID:
4610                         task->tk_status = 0;
4611                         return -EAGAIN;
4612         }
4613         task->tk_status = nfs4_map_errors(task->tk_status);
4614         return 0;
4615 stateid_invalid:
4616         task->tk_status = -EIO;
4617         return 0;
4618 wait_on_recovery:
4619         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4620         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4621                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4622         task->tk_status = 0;
4623         return -EAGAIN;
4624 }
4625
4626 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4627                                     nfs4_verifier *bootverf)
4628 {
4629         __be32 verf[2];
4630
4631         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4632                 /* An impossible timestamp guarantees this value
4633                  * will never match a generated boot time. */
4634                 verf[0] = 0;
4635                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4636         } else {
4637                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4638                 verf[0] = (__be32)nn->boot_time.tv_sec;
4639                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4640         }
4641         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4642 }
4643
4644 static unsigned int
4645 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4646                                    char *buf, size_t len)
4647 {
4648         unsigned int result;
4649
4650         rcu_read_lock();
4651         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4652                                 clp->cl_ipaddr,
4653                                 rpc_peeraddr2str(clp->cl_rpcclient,
4654                                                         RPC_DISPLAY_ADDR),
4655                                 rpc_peeraddr2str(clp->cl_rpcclient,
4656                                                         RPC_DISPLAY_PROTO));
4657         rcu_read_unlock();
4658         return result;
4659 }
4660
4661 static unsigned int
4662 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4663                                 char *buf, size_t len)
4664 {
4665         const char *nodename = clp->cl_rpcclient->cl_nodename;
4666
4667         if (nfs4_client_id_uniquifier[0] != '\0')
4668                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4669                                 clp->rpc_ops->version,
4670                                 clp->cl_minorversion,
4671                                 nfs4_client_id_uniquifier,
4672                                 nodename);
4673         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4674                                 clp->rpc_ops->version, clp->cl_minorversion,
4675                                 nodename);
4676 }
4677
4678 /**
4679  * nfs4_proc_setclientid - Negotiate client ID
4680  * @clp: state data structure
4681  * @program: RPC program for NFSv4 callback service
4682  * @port: IP port number for NFS4 callback service
4683  * @cred: RPC credential to use for this call
4684  * @res: where to place the result
4685  *
4686  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4687  */
4688 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4689                 unsigned short port, struct rpc_cred *cred,
4690                 struct nfs4_setclientid_res *res)
4691 {
4692         nfs4_verifier sc_verifier;
4693         struct nfs4_setclientid setclientid = {
4694                 .sc_verifier = &sc_verifier,
4695                 .sc_prog = program,
4696                 .sc_cb_ident = clp->cl_cb_ident,
4697         };
4698         struct rpc_message msg = {
4699                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4700                 .rpc_argp = &setclientid,
4701                 .rpc_resp = res,
4702                 .rpc_cred = cred,
4703         };
4704         int status;
4705
4706         /* nfs_client_id4 */
4707         nfs4_init_boot_verifier(clp, &sc_verifier);
4708         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4709                 setclientid.sc_name_len =
4710                                 nfs4_init_uniform_client_string(clp,
4711                                                 setclientid.sc_name,
4712                                                 sizeof(setclientid.sc_name));
4713         else
4714                 setclientid.sc_name_len =
4715                                 nfs4_init_nonuniform_client_string(clp,
4716                                                 setclientid.sc_name,
4717                                                 sizeof(setclientid.sc_name));
4718         /* cb_client4 */
4719         rcu_read_lock();
4720         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4721                                 sizeof(setclientid.sc_netid), "%s",
4722                                 rpc_peeraddr2str(clp->cl_rpcclient,
4723                                                         RPC_DISPLAY_NETID));
4724         rcu_read_unlock();
4725         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4726                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4727                                 clp->cl_ipaddr, port >> 8, port & 255);
4728
4729         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4730                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4731                 setclientid.sc_name_len, setclientid.sc_name);
4732         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4733         dprintk("NFS reply setclientid: %d\n", status);
4734         return status;
4735 }
4736
4737 /**
4738  * nfs4_proc_setclientid_confirm - Confirm client ID
4739  * @clp: state data structure
4740  * @res: result of a previous SETCLIENTID
4741  * @cred: RPC credential to use for this call
4742  *
4743  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4744  */
4745 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4746                 struct nfs4_setclientid_res *arg,
4747                 struct rpc_cred *cred)
4748 {
4749         struct rpc_message msg = {
4750                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4751                 .rpc_argp = arg,
4752                 .rpc_cred = cred,
4753         };
4754         int status;
4755
4756         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4757                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4758                 clp->cl_clientid);
4759         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4760         dprintk("NFS reply setclientid_confirm: %d\n", status);
4761         return status;
4762 }
4763
4764 struct nfs4_delegreturndata {
4765         struct nfs4_delegreturnargs args;
4766         struct nfs4_delegreturnres res;
4767         struct nfs_fh fh;
4768         nfs4_stateid stateid;
4769         unsigned long timestamp;
4770         struct nfs_fattr fattr;
4771         int rpc_status;
4772 };
4773
4774 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4775 {
4776         struct nfs4_delegreturndata *data = calldata;
4777
4778         if (!nfs4_sequence_done(task, &data->res.seq_res))
4779                 return;
4780
4781         switch (task->tk_status) {
4782         case -NFS4ERR_STALE_STATEID:
4783         case -NFS4ERR_EXPIRED:
4784         case 0:
4785                 renew_lease(data->res.server, data->timestamp);
4786                 break;
4787         default:
4788                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4789                                 -EAGAIN) {
4790                         rpc_restart_call_prepare(task);
4791                         return;
4792                 }
4793         }
4794         data->rpc_status = task->tk_status;
4795 }
4796
4797 static void nfs4_delegreturn_release(void *calldata)
4798 {
4799         kfree(calldata);
4800 }
4801
4802 #if defined(CONFIG_NFS_V4_1)
4803 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4804 {
4805         struct nfs4_delegreturndata *d_data;
4806
4807         d_data = (struct nfs4_delegreturndata *)data;
4808
4809         nfs4_setup_sequence(d_data->res.server,
4810                         &d_data->args.seq_args,
4811                         &d_data->res.seq_res,
4812                         task);
4813 }
4814 #endif /* CONFIG_NFS_V4_1 */
4815
4816 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4817 #if defined(CONFIG_NFS_V4_1)
4818         .rpc_call_prepare = nfs4_delegreturn_prepare,
4819 #endif /* CONFIG_NFS_V4_1 */
4820         .rpc_call_done = nfs4_delegreturn_done,
4821         .rpc_release = nfs4_delegreturn_release,
4822 };
4823
4824 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4825 {
4826         struct nfs4_delegreturndata *data;
4827         struct nfs_server *server = NFS_SERVER(inode);
4828         struct rpc_task *task;
4829         struct rpc_message msg = {
4830                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4831                 .rpc_cred = cred,
4832         };
4833         struct rpc_task_setup task_setup_data = {
4834                 .rpc_client = server->client,
4835                 .rpc_message = &msg,
4836                 .callback_ops = &nfs4_delegreturn_ops,
4837                 .flags = RPC_TASK_ASYNC,
4838         };
4839         int status = 0;
4840
4841         data = kzalloc(sizeof(*data), GFP_NOFS);
4842         if (data == NULL)
4843                 return -ENOMEM;
4844         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4845         data->args.fhandle = &data->fh;
4846         data->args.stateid = &data->stateid;
4847         data->args.bitmask = server->cache_consistency_bitmask;
4848         nfs_copy_fh(&data->fh, NFS_FH(inode));
4849         nfs4_stateid_copy(&data->stateid, stateid);
4850         data->res.fattr = &data->fattr;
4851         data->res.server = server;
4852         nfs_fattr_init(data->res.fattr);
4853         data->timestamp = jiffies;
4854         data->rpc_status = 0;
4855
4856         task_setup_data.callback_data = data;
4857         msg.rpc_argp = &data->args;
4858         msg.rpc_resp = &data->res;
4859         task = rpc_run_task(&task_setup_data);
4860         if (IS_ERR(task))
4861                 return PTR_ERR(task);
4862         if (!issync)
4863                 goto out;
4864         status = nfs4_wait_for_completion_rpc_task(task);
4865         if (status != 0)
4866                 goto out;
4867         status = data->rpc_status;
4868         if (status == 0)
4869                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4870         else
4871                 nfs_refresh_inode(inode, &data->fattr);
4872 out:
4873         rpc_put_task(task);
4874         return status;
4875 }
4876
4877 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4878 {
4879         struct nfs_server *server = NFS_SERVER(inode);
4880         struct nfs4_exception exception = { };
4881         int err;
4882         do {
4883                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4884                 switch (err) {
4885                         case -NFS4ERR_STALE_STATEID:
4886                         case -NFS4ERR_EXPIRED:
4887                         case 0:
4888                                 return 0;
4889                 }
4890                 err = nfs4_handle_exception(server, err, &exception);
4891         } while (exception.retry);
4892         return err;
4893 }
4894
4895 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4896 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4897
4898 /*
4899  * sleep, with exponential backoff, and retry the LOCK operation.
4900  */
4901 static unsigned long
4902 nfs4_set_lock_task_retry(unsigned long timeout)
4903 {
4904         freezable_schedule_timeout_killable_unsafe(timeout);
4905         timeout <<= 1;
4906         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4907                 return NFS4_LOCK_MAXTIMEOUT;
4908         return timeout;
4909 }
4910
4911 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4912 {
4913         struct inode *inode = state->inode;
4914         struct nfs_server *server = NFS_SERVER(inode);
4915         struct nfs_client *clp = server->nfs_client;
4916         struct nfs_lockt_args arg = {
4917                 .fh = NFS_FH(inode),
4918                 .fl = request,
4919         };
4920         struct nfs_lockt_res res = {
4921                 .denied = request,
4922         };
4923         struct rpc_message msg = {
4924                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4925                 .rpc_argp       = &arg,
4926                 .rpc_resp       = &res,
4927                 .rpc_cred       = state->owner->so_cred,
4928         };
4929         struct nfs4_lock_state *lsp;
4930         int status;
4931
4932         arg.lock_owner.clientid = clp->cl_clientid;
4933         status = nfs4_set_lock_state(state, request);
4934         if (status != 0)
4935                 goto out;
4936         lsp = request->fl_u.nfs4_fl.owner;
4937         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4938         arg.lock_owner.s_dev = server->s_dev;
4939         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4940         switch (status) {
4941                 case 0:
4942                         request->fl_type = F_UNLCK;
4943                         break;
4944                 case -NFS4ERR_DENIED:
4945                         status = 0;
4946         }
4947         request->fl_ops->fl_release_private(request);
4948 out:
4949         return status;
4950 }
4951
4952 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4953 {
4954         struct nfs4_exception exception = { };
4955         int err;
4956
4957         do {
4958                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4959                                 _nfs4_proc_getlk(state, cmd, request),
4960                                 &exception);
4961         } while (exception.retry);
4962         return err;
4963 }
4964
4965 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4966 {
4967         int res = 0;
4968         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4969                 case FL_POSIX:
4970                         res = posix_lock_file_wait(file, fl);
4971                         break;
4972                 case FL_FLOCK:
4973                         res = flock_lock_file_wait(file, fl);
4974                         break;
4975                 default:
4976                         BUG();
4977         }
4978         return res;
4979 }
4980
4981 struct nfs4_unlockdata {
4982         struct nfs_locku_args arg;
4983         struct nfs_locku_res res;
4984         struct nfs4_lock_state *lsp;
4985         struct nfs_open_context *ctx;
4986         struct file_lock fl;
4987         const struct nfs_server *server;
4988         unsigned long timestamp;
4989 };
4990
4991 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4992                 struct nfs_open_context *ctx,
4993                 struct nfs4_lock_state *lsp,
4994                 struct nfs_seqid *seqid)
4995 {
4996         struct nfs4_unlockdata *p;
4997         struct inode *inode = lsp->ls_state->inode;
4998
4999         p = kzalloc(sizeof(*p), GFP_NOFS);
5000         if (p == NULL)
5001                 return NULL;
5002         p->arg.fh = NFS_FH(inode);
5003         p->arg.fl = &p->fl;
5004         p->arg.seqid = seqid;
5005         p->res.seqid = seqid;
5006         p->arg.stateid = &lsp->ls_stateid;
5007         p->lsp = lsp;
5008         atomic_inc(&lsp->ls_count);
5009         /* Ensure we don't close file until we're done freeing locks! */
5010         p->ctx = get_nfs_open_context(ctx);
5011         memcpy(&p->fl, fl, sizeof(p->fl));
5012         p->server = NFS_SERVER(inode);
5013         return p;
5014 }
5015
5016 static void nfs4_locku_release_calldata(void *data)
5017 {
5018         struct nfs4_unlockdata *calldata = data;
5019         nfs_free_seqid(calldata->arg.seqid);
5020         nfs4_put_lock_state(calldata->lsp);
5021         put_nfs_open_context(calldata->ctx);
5022         kfree(calldata);
5023 }
5024
5025 static void nfs4_locku_done(struct rpc_task *task, void *data)
5026 {
5027         struct nfs4_unlockdata *calldata = data;
5028
5029         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5030                 return;
5031         switch (task->tk_status) {
5032                 case 0:
5033                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5034                                         &calldata->res.stateid);
5035                         renew_lease(calldata->server, calldata->timestamp);
5036                         break;
5037                 case -NFS4ERR_BAD_STATEID:
5038                 case -NFS4ERR_OLD_STATEID:
5039                 case -NFS4ERR_STALE_STATEID:
5040                 case -NFS4ERR_EXPIRED:
5041                         break;
5042                 default:
5043                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5044                                 rpc_restart_call_prepare(task);
5045         }
5046         nfs_release_seqid(calldata->arg.seqid);
5047 }
5048
5049 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5050 {
5051         struct nfs4_unlockdata *calldata = data;
5052
5053         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5054                 goto out_wait;
5055         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5056                 /* Note: exit _without_ running nfs4_locku_done */
5057                 goto out_no_action;
5058         }
5059         calldata->timestamp = jiffies;
5060         if (nfs4_setup_sequence(calldata->server,
5061                                 &calldata->arg.seq_args,
5062                                 &calldata->res.seq_res,
5063                                 task) != 0)
5064                 nfs_release_seqid(calldata->arg.seqid);
5065         return;
5066 out_no_action:
5067         task->tk_action = NULL;
5068 out_wait:
5069         nfs4_sequence_done(task, &calldata->res.seq_res);
5070 }
5071
5072 static const struct rpc_call_ops nfs4_locku_ops = {
5073         .rpc_call_prepare = nfs4_locku_prepare,
5074         .rpc_call_done = nfs4_locku_done,
5075         .rpc_release = nfs4_locku_release_calldata,
5076 };
5077
5078 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5079                 struct nfs_open_context *ctx,
5080                 struct nfs4_lock_state *lsp,
5081                 struct nfs_seqid *seqid)
5082 {
5083         struct nfs4_unlockdata *data;
5084         struct rpc_message msg = {
5085                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5086                 .rpc_cred = ctx->cred,
5087         };
5088         struct rpc_task_setup task_setup_data = {
5089                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5090                 .rpc_message = &msg,
5091                 .callback_ops = &nfs4_locku_ops,
5092                 .workqueue = nfsiod_workqueue,
5093                 .flags = RPC_TASK_ASYNC,
5094         };
5095
5096         /* Ensure this is an unlock - when canceling a lock, the
5097          * canceled lock is passed in, and it won't be an unlock.
5098          */
5099         fl->fl_type = F_UNLCK;
5100
5101         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5102         if (data == NULL) {
5103                 nfs_free_seqid(seqid);
5104                 return ERR_PTR(-ENOMEM);
5105         }
5106
5107         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5108         msg.rpc_argp = &data->arg;
5109         msg.rpc_resp = &data->res;
5110         task_setup_data.callback_data = data;
5111         return rpc_run_task(&task_setup_data);
5112 }
5113
5114 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5115 {
5116         struct inode *inode = state->inode;
5117         struct nfs4_state_owner *sp = state->owner;
5118         struct nfs_inode *nfsi = NFS_I(inode);
5119         struct nfs_seqid *seqid;
5120         struct nfs4_lock_state *lsp;
5121         struct rpc_task *task;
5122         int status = 0;
5123         unsigned char fl_flags = request->fl_flags;
5124
5125         status = nfs4_set_lock_state(state, request);
5126         /* Unlock _before_ we do the RPC call */
5127         request->fl_flags |= FL_EXISTS;
5128         /* Exclude nfs_delegation_claim_locks() */
5129         mutex_lock(&sp->so_delegreturn_mutex);
5130         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5131         down_read(&nfsi->rwsem);
5132         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5133                 up_read(&nfsi->rwsem);
5134                 mutex_unlock(&sp->so_delegreturn_mutex);
5135                 goto out;
5136         }
5137         up_read(&nfsi->rwsem);
5138         mutex_unlock(&sp->so_delegreturn_mutex);
5139         if (status != 0)
5140                 goto out;
5141         /* Is this a delegated lock? */
5142         lsp = request->fl_u.nfs4_fl.owner;
5143         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5144                 goto out;
5145         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5146         status = -ENOMEM;
5147         if (seqid == NULL)
5148                 goto out;
5149         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5150         status = PTR_ERR(task);
5151         if (IS_ERR(task))
5152                 goto out;
5153         status = nfs4_wait_for_completion_rpc_task(task);
5154         rpc_put_task(task);
5155 out:
5156         request->fl_flags = fl_flags;
5157         return status;
5158 }
5159
5160 struct nfs4_lockdata {
5161         struct nfs_lock_args arg;
5162         struct nfs_lock_res res;
5163         struct nfs4_lock_state *lsp;
5164         struct nfs_open_context *ctx;
5165         struct file_lock fl;
5166         unsigned long timestamp;
5167         int rpc_status;
5168         int cancelled;
5169         struct nfs_server *server;
5170 };
5171
5172 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5173                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5174                 gfp_t gfp_mask)
5175 {
5176         struct nfs4_lockdata *p;
5177         struct inode *inode = lsp->ls_state->inode;
5178         struct nfs_server *server = NFS_SERVER(inode);
5179
5180         p = kzalloc(sizeof(*p), gfp_mask);
5181         if (p == NULL)
5182                 return NULL;
5183
5184         p->arg.fh = NFS_FH(inode);
5185         p->arg.fl = &p->fl;
5186         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5187         if (p->arg.open_seqid == NULL)
5188                 goto out_free;
5189         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5190         if (p->arg.lock_seqid == NULL)
5191                 goto out_free_seqid;
5192         p->arg.lock_stateid = &lsp->ls_stateid;
5193         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5194         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5195         p->arg.lock_owner.s_dev = server->s_dev;
5196         p->res.lock_seqid = p->arg.lock_seqid;
5197         p->lsp = lsp;
5198         p->server = server;
5199         atomic_inc(&lsp->ls_count);
5200         p->ctx = get_nfs_open_context(ctx);
5201         memcpy(&p->fl, fl, sizeof(p->fl));
5202         return p;
5203 out_free_seqid:
5204         nfs_free_seqid(p->arg.open_seqid);
5205 out_free:
5206         kfree(p);
5207         return NULL;
5208 }
5209
5210 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5211 {
5212         struct nfs4_lockdata *data = calldata;
5213         struct nfs4_state *state = data->lsp->ls_state;
5214
5215         dprintk("%s: begin!\n", __func__);
5216         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5217                 goto out_wait;
5218         /* Do we need to do an open_to_lock_owner? */
5219         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5220                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5221                         goto out_release_lock_seqid;
5222                 }
5223                 data->arg.open_stateid = &state->open_stateid;
5224                 data->arg.new_lock_owner = 1;
5225                 data->res.open_seqid = data->arg.open_seqid;
5226         } else
5227                 data->arg.new_lock_owner = 0;
5228         if (!nfs4_valid_open_stateid(state)) {
5229                 data->rpc_status = -EBADF;
5230                 task->tk_action = NULL;
5231                 goto out_release_open_seqid;
5232         }
5233         data->timestamp = jiffies;
5234         if (nfs4_setup_sequence(data->server,
5235                                 &data->arg.seq_args,
5236                                 &data->res.seq_res,
5237                                 task) == 0)
5238                 return;
5239 out_release_open_seqid:
5240         nfs_release_seqid(data->arg.open_seqid);
5241 out_release_lock_seqid:
5242         nfs_release_seqid(data->arg.lock_seqid);
5243 out_wait:
5244         nfs4_sequence_done(task, &data->res.seq_res);
5245         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5246 }
5247
5248 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5249 {
5250         struct nfs4_lockdata *data = calldata;
5251
5252         dprintk("%s: begin!\n", __func__);
5253
5254         if (!nfs4_sequence_done(task, &data->res.seq_res))
5255                 return;
5256
5257         data->rpc_status = task->tk_status;
5258         if (data->arg.new_lock_owner != 0) {
5259                 if (data->rpc_status == 0)
5260                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5261                 else
5262                         goto out;
5263         }
5264         if (data->rpc_status == 0) {
5265                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5266                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5267                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5268         }
5269 out:
5270         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5271 }
5272
5273 static void nfs4_lock_release(void *calldata)
5274 {
5275         struct nfs4_lockdata *data = calldata;
5276
5277         dprintk("%s: begin!\n", __func__);
5278         nfs_free_seqid(data->arg.open_seqid);
5279         if (data->cancelled != 0) {
5280                 struct rpc_task *task;
5281                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5282                                 data->arg.lock_seqid);
5283                 if (!IS_ERR(task))
5284                         rpc_put_task_async(task);
5285                 dprintk("%s: cancelling lock!\n", __func__);
5286         } else
5287                 nfs_free_seqid(data->arg.lock_seqid);
5288         nfs4_put_lock_state(data->lsp);
5289         put_nfs_open_context(data->ctx);
5290         kfree(data);
5291         dprintk("%s: done!\n", __func__);
5292 }
5293
5294 static const struct rpc_call_ops nfs4_lock_ops = {
5295         .rpc_call_prepare = nfs4_lock_prepare,
5296         .rpc_call_done = nfs4_lock_done,
5297         .rpc_release = nfs4_lock_release,
5298 };
5299
5300 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5301 {
5302         switch (error) {
5303         case -NFS4ERR_ADMIN_REVOKED:
5304         case -NFS4ERR_BAD_STATEID:
5305                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5306                 if (new_lock_owner != 0 ||
5307                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5308                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5309                 break;
5310         case -NFS4ERR_STALE_STATEID:
5311                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5312         case -NFS4ERR_EXPIRED:
5313                 nfs4_schedule_lease_recovery(server->nfs_client);
5314         };
5315 }
5316
5317 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5318 {
5319         struct nfs4_lockdata *data;
5320         struct rpc_task *task;
5321         struct rpc_message msg = {
5322                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5323                 .rpc_cred = state->owner->so_cred,
5324         };
5325         struct rpc_task_setup task_setup_data = {
5326                 .rpc_client = NFS_CLIENT(state->inode),
5327                 .rpc_message = &msg,
5328                 .callback_ops = &nfs4_lock_ops,
5329                 .workqueue = nfsiod_workqueue,
5330                 .flags = RPC_TASK_ASYNC,
5331         };
5332         int ret;
5333
5334         dprintk("%s: begin!\n", __func__);
5335         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5336                         fl->fl_u.nfs4_fl.owner,
5337                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5338         if (data == NULL)
5339                 return -ENOMEM;
5340         if (IS_SETLKW(cmd))
5341                 data->arg.block = 1;
5342         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5343         msg.rpc_argp = &data->arg;
5344         msg.rpc_resp = &data->res;
5345         task_setup_data.callback_data = data;
5346         if (recovery_type > NFS_LOCK_NEW) {
5347                 if (recovery_type == NFS_LOCK_RECLAIM)
5348                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5349                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5350         }
5351         task = rpc_run_task(&task_setup_data);
5352         if (IS_ERR(task))
5353                 return PTR_ERR(task);
5354         ret = nfs4_wait_for_completion_rpc_task(task);
5355         if (ret == 0) {
5356                 ret = data->rpc_status;
5357                 if (ret)
5358                         nfs4_handle_setlk_error(data->server, data->lsp,
5359                                         data->arg.new_lock_owner, ret);
5360         } else
5361                 data->cancelled = 1;
5362         rpc_put_task(task);
5363         dprintk("%s: done, ret = %d!\n", __func__, ret);
5364         return ret;
5365 }
5366
5367 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5368 {
5369         struct nfs_server *server = NFS_SERVER(state->inode);
5370         struct nfs4_exception exception = {
5371                 .inode = state->inode,
5372         };
5373         int err;
5374
5375         do {
5376                 /* Cache the lock if possible... */
5377                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5378                         return 0;
5379                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5380                 if (err != -NFS4ERR_DELAY)
5381                         break;
5382                 nfs4_handle_exception(server, err, &exception);
5383         } while (exception.retry);
5384         return err;
5385 }
5386
5387 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5388 {
5389         struct nfs_server *server = NFS_SERVER(state->inode);
5390         struct nfs4_exception exception = {
5391                 .inode = state->inode,
5392         };
5393         int err;
5394
5395         err = nfs4_set_lock_state(state, request);
5396         if (err != 0)
5397                 return err;
5398         do {
5399                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5400                         return 0;
5401                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5402                 switch (err) {
5403                 default:
5404                         goto out;
5405                 case -NFS4ERR_GRACE:
5406                 case -NFS4ERR_DELAY:
5407                         nfs4_handle_exception(server, err, &exception);
5408                         err = 0;
5409                 }
5410         } while (exception.retry);
5411 out:
5412         return err;
5413 }
5414
5415 #if defined(CONFIG_NFS_V4_1)
5416 /**
5417  * nfs41_check_expired_locks - possibly free a lock stateid
5418  *
5419  * @state: NFSv4 state for an inode
5420  *
5421  * Returns NFS_OK if recovery for this stateid is now finished.
5422  * Otherwise a negative NFS4ERR value is returned.
5423  */
5424 static int nfs41_check_expired_locks(struct nfs4_state *state)
5425 {
5426         int status, ret = -NFS4ERR_BAD_STATEID;
5427         struct nfs4_lock_state *lsp;
5428         struct nfs_server *server = NFS_SERVER(state->inode);
5429
5430         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5431                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5432                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5433
5434                         status = nfs41_test_stateid(server,
5435                                         &lsp->ls_stateid,
5436                                         cred);
5437                         if (status != NFS_OK) {
5438                                 /* Free the stateid unless the server
5439                                  * informs us the stateid is unrecognized. */
5440                                 if (status != -NFS4ERR_BAD_STATEID)
5441                                         nfs41_free_stateid(server,
5442                                                         &lsp->ls_stateid,
5443                                                         cred);
5444                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5445                                 ret = status;
5446                         }
5447                 }
5448         };
5449
5450         return ret;
5451 }
5452
5453 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5454 {
5455         int status = NFS_OK;
5456
5457         if (test_bit(LK_STATE_IN_USE, &state->flags))
5458                 status = nfs41_check_expired_locks(state);
5459         if (status != NFS_OK)
5460                 status = nfs4_lock_expired(state, request);
5461         return status;
5462 }
5463 #endif
5464
5465 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5466 {
5467         struct nfs4_state_owner *sp = state->owner;
5468         struct nfs_inode *nfsi = NFS_I(state->inode);
5469         unsigned char fl_flags = request->fl_flags;
5470         unsigned int seq;
5471         int status = -ENOLCK;
5472
5473         if ((fl_flags & FL_POSIX) &&
5474                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5475                 goto out;
5476         /* Is this a delegated open? */
5477         status = nfs4_set_lock_state(state, request);
5478         if (status != 0)
5479                 goto out;
5480         request->fl_flags |= FL_ACCESS;
5481         status = do_vfs_lock(request->fl_file, request);
5482         if (status < 0)
5483                 goto out;
5484         down_read(&nfsi->rwsem);
5485         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5486                 /* Yes: cache locks! */
5487                 /* ...but avoid races with delegation recall... */
5488                 request->fl_flags = fl_flags & ~FL_SLEEP;
5489                 status = do_vfs_lock(request->fl_file, request);
5490                 goto out_unlock;
5491         }
5492         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5493         up_read(&nfsi->rwsem);
5494         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5495         if (status != 0)
5496                 goto out;
5497         down_read(&nfsi->rwsem);
5498         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5499                 status = -NFS4ERR_DELAY;
5500                 goto out_unlock;
5501         }
5502         /* Note: we always want to sleep here! */
5503         request->fl_flags = fl_flags | FL_SLEEP;
5504         if (do_vfs_lock(request->fl_file, request) < 0)
5505                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5506                         "manager!\n", __func__);
5507 out_unlock:
5508         up_read(&nfsi->rwsem);
5509 out:
5510         request->fl_flags = fl_flags;
5511         return status;
5512 }
5513
5514 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5515 {
5516         struct nfs4_exception exception = {
5517                 .state = state,
5518                 .inode = state->inode,
5519         };
5520         int err;
5521
5522         do {
5523                 err = _nfs4_proc_setlk(state, cmd, request);
5524                 if (err == -NFS4ERR_DENIED)
5525                         err = -EAGAIN;
5526                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5527                                 err, &exception);
5528         } while (exception.retry);
5529         return err;
5530 }
5531
5532 static int
5533 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5534 {
5535         struct nfs_open_context *ctx;
5536         struct nfs4_state *state;
5537         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5538         int status;
5539
5540         /* verify open state */
5541         ctx = nfs_file_open_context(filp);
5542         state = ctx->state;
5543
5544         if (request->fl_start < 0 || request->fl_end < 0)
5545                 return -EINVAL;
5546
5547         if (IS_GETLK(cmd)) {
5548                 if (state != NULL)
5549                         return nfs4_proc_getlk(state, F_GETLK, request);
5550                 return 0;
5551         }
5552
5553         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5554                 return -EINVAL;
5555
5556         if (request->fl_type == F_UNLCK) {
5557                 if (state != NULL)
5558                         return nfs4_proc_unlck(state, cmd, request);
5559                 return 0;
5560         }
5561
5562         if (state == NULL)
5563                 return -ENOLCK;
5564         /*
5565          * Don't rely on the VFS having checked the file open mode,
5566          * since it won't do this for flock() locks.
5567          */
5568         switch (request->fl_type) {
5569         case F_RDLCK:
5570                 if (!(filp->f_mode & FMODE_READ))
5571                         return -EBADF;
5572                 break;
5573         case F_WRLCK:
5574                 if (!(filp->f_mode & FMODE_WRITE))
5575                         return -EBADF;
5576         }
5577
5578         do {
5579                 status = nfs4_proc_setlk(state, cmd, request);
5580                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5581                         break;
5582                 timeout = nfs4_set_lock_task_retry(timeout);
5583                 status = -ERESTARTSYS;
5584                 if (signalled())
5585                         break;
5586         } while(status < 0);
5587         return status;
5588 }
5589
5590 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5591 {
5592         struct nfs_server *server = NFS_SERVER(state->inode);
5593         int err;
5594
5595         err = nfs4_set_lock_state(state, fl);
5596         if (err != 0)
5597                 return err;
5598         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5599         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5600 }
5601
5602 struct nfs_release_lockowner_data {
5603         struct nfs4_lock_state *lsp;
5604         struct nfs_server *server;
5605         struct nfs_release_lockowner_args args;
5606 };
5607
5608 static void nfs4_release_lockowner_release(void *calldata)
5609 {
5610         struct nfs_release_lockowner_data *data = calldata;
5611         nfs4_free_lock_state(data->server, data->lsp);
5612         kfree(calldata);
5613 }
5614
5615 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5616         .rpc_release = nfs4_release_lockowner_release,
5617 };
5618
5619 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5620 {
5621         struct nfs_release_lockowner_data *data;
5622         struct rpc_message msg = {
5623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5624         };
5625
5626         if (server->nfs_client->cl_mvops->minor_version != 0)
5627                 return -EINVAL;
5628         data = kmalloc(sizeof(*data), GFP_NOFS);
5629         if (!data)
5630                 return -ENOMEM;
5631         data->lsp = lsp;
5632         data->server = server;
5633         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5634         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5635         data->args.lock_owner.s_dev = server->s_dev;
5636         msg.rpc_argp = &data->args;
5637         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5638         return 0;
5639 }
5640
5641 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5642
5643 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5644                                    const void *buf, size_t buflen,
5645                                    int flags, int type)
5646 {
5647         if (strcmp(key, "") != 0)
5648                 return -EINVAL;
5649
5650         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5651 }
5652
5653 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5654                                    void *buf, size_t buflen, int type)
5655 {
5656         if (strcmp(key, "") != 0)
5657                 return -EINVAL;
5658
5659         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5660 }
5661
5662 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5663                                        size_t list_len, const char *name,
5664                                        size_t name_len, int type)
5665 {
5666         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5667
5668         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5669                 return 0;
5670
5671         if (list && len <= list_len)
5672                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5673         return len;
5674 }
5675
5676 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5677 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5678 {
5679         return server->caps & NFS_CAP_SECURITY_LABEL;
5680 }
5681
5682 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5683                                    const void *buf, size_t buflen,
5684                                    int flags, int type)
5685 {
5686         if (security_ismaclabel(key))
5687                 return nfs4_set_security_label(dentry, buf, buflen);
5688
5689         return -EOPNOTSUPP;
5690 }
5691
5692 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5693                                    void *buf, size_t buflen, int type)
5694 {
5695         if (security_ismaclabel(key))
5696                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5697         return -EOPNOTSUPP;
5698 }
5699
5700 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5701                                        size_t list_len, const char *name,
5702                                        size_t name_len, int type)
5703 {
5704         size_t len = 0;
5705
5706         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5707                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5708                 if (list && len <= list_len)
5709                         security_inode_listsecurity(dentry->d_inode, list, len);
5710         }
5711         return len;
5712 }
5713
5714 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5715         .prefix = XATTR_SECURITY_PREFIX,
5716         .list   = nfs4_xattr_list_nfs4_label,
5717         .get    = nfs4_xattr_get_nfs4_label,
5718         .set    = nfs4_xattr_set_nfs4_label,
5719 };
5720 #endif
5721
5722
5723 /*
5724  * nfs_fhget will use either the mounted_on_fileid or the fileid
5725  */
5726 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5727 {
5728         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5729                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5730               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5731               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5732                 return;
5733
5734         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5735                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5736         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5737         fattr->nlink = 2;
5738 }
5739
5740 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5741                                    const struct qstr *name,
5742                                    struct nfs4_fs_locations *fs_locations,
5743                                    struct page *page)
5744 {
5745         struct nfs_server *server = NFS_SERVER(dir);
5746         u32 bitmask[3] = {
5747                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5748         };
5749         struct nfs4_fs_locations_arg args = {
5750                 .dir_fh = NFS_FH(dir),
5751                 .name = name,
5752                 .page = page,
5753                 .bitmask = bitmask,
5754         };
5755         struct nfs4_fs_locations_res res = {
5756                 .fs_locations = fs_locations,
5757         };
5758         struct rpc_message msg = {
5759                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5760                 .rpc_argp = &args,
5761                 .rpc_resp = &res,
5762         };
5763         int status;
5764
5765         dprintk("%s: start\n", __func__);
5766
5767         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5768          * is not supported */
5769         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5770                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5771         else
5772                 bitmask[0] |= FATTR4_WORD0_FILEID;
5773
5774         nfs_fattr_init(&fs_locations->fattr);
5775         fs_locations->server = server;
5776         fs_locations->nlocations = 0;
5777         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5778         dprintk("%s: returned status = %d\n", __func__, status);
5779         return status;
5780 }
5781
5782 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5783                            const struct qstr *name,
5784                            struct nfs4_fs_locations *fs_locations,
5785                            struct page *page)
5786 {
5787         struct nfs4_exception exception = { };
5788         int err;
5789         do {
5790                 err = nfs4_handle_exception(NFS_SERVER(dir),
5791                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5792                                 &exception);
5793         } while (exception.retry);
5794         return err;
5795 }
5796
5797 /**
5798  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
5799  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
5800  */
5801 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5802 {
5803         int status;
5804         struct nfs4_secinfo_arg args = {
5805                 .dir_fh = NFS_FH(dir),
5806                 .name   = name,
5807         };
5808         struct nfs4_secinfo_res res = {
5809                 .flavors     = flavors,
5810         };
5811         struct rpc_message msg = {
5812                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5813                 .rpc_argp = &args,
5814                 .rpc_resp = &res,
5815         };
5816         struct rpc_clnt *clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
5817
5818         dprintk("NFS call  secinfo %s\n", name->name);
5819         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5820         dprintk("NFS reply  secinfo: %d\n", status);
5821         return status;
5822 }
5823
5824 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5825                       struct nfs4_secinfo_flavors *flavors)
5826 {
5827         struct nfs4_exception exception = { };
5828         int err;
5829         do {
5830                 err = nfs4_handle_exception(NFS_SERVER(dir),
5831                                 _nfs4_proc_secinfo(dir, name, flavors),
5832                                 &exception);
5833         } while (exception.retry);
5834         return err;
5835 }
5836
5837 #ifdef CONFIG_NFS_V4_1
5838 /*
5839  * Check the exchange flags returned by the server for invalid flags, having
5840  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5841  * DS flags set.
5842  */
5843 static int nfs4_check_cl_exchange_flags(u32 flags)
5844 {
5845         if (flags & ~EXCHGID4_FLAG_MASK_R)
5846                 goto out_inval;
5847         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5848             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5849                 goto out_inval;
5850         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5851                 goto out_inval;
5852         return NFS_OK;
5853 out_inval:
5854         return -NFS4ERR_INVAL;
5855 }
5856
5857 static bool
5858 nfs41_same_server_scope(struct nfs41_server_scope *a,
5859                         struct nfs41_server_scope *b)
5860 {
5861         if (a->server_scope_sz == b->server_scope_sz &&
5862             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5863                 return true;
5864
5865         return false;
5866 }
5867
5868 /*
5869  * nfs4_proc_bind_conn_to_session()
5870  *
5871  * The 4.1 client currently uses the same TCP connection for the
5872  * fore and backchannel.
5873  */
5874 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5875 {
5876         int status;
5877         struct nfs41_bind_conn_to_session_res res;
5878         struct rpc_message msg = {
5879                 .rpc_proc =
5880                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5881                 .rpc_argp = clp,
5882                 .rpc_resp = &res,
5883                 .rpc_cred = cred,
5884         };
5885
5886         dprintk("--> %s\n", __func__);
5887
5888         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5889         if (unlikely(res.session == NULL)) {
5890                 status = -ENOMEM;
5891                 goto out;
5892         }
5893
5894         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5895         if (status == 0) {
5896                 if (memcmp(res.session->sess_id.data,
5897                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5898                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5899                         status = -EIO;
5900                         goto out_session;
5901                 }
5902                 if (res.dir != NFS4_CDFS4_BOTH) {
5903                         dprintk("NFS: %s: Unexpected direction from server\n",
5904                                 __func__);
5905                         status = -EIO;
5906                         goto out_session;
5907                 }
5908                 if (res.use_conn_in_rdma_mode) {
5909                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5910                                 __func__);
5911                         status = -EIO;
5912                         goto out_session;
5913                 }
5914         }
5915 out_session:
5916         kfree(res.session);
5917 out:
5918         dprintk("<-- %s status= %d\n", __func__, status);
5919         return status;
5920 }
5921
5922 /*
5923  * nfs4_proc_exchange_id()
5924  *
5925  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5926  *
5927  * Since the clientid has expired, all compounds using sessions
5928  * associated with the stale clientid will be returning
5929  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5930  * be in some phase of session reset.
5931  */
5932 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5933 {
5934         nfs4_verifier verifier;
5935         struct nfs41_exchange_id_args args = {
5936                 .verifier = &verifier,
5937                 .client = clp,
5938                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
5939                         EXCHGID4_FLAG_BIND_PRINC_STATEID,
5940         };
5941         struct nfs41_exchange_id_res res = {
5942                 0
5943         };
5944         int status;
5945         struct rpc_message msg = {
5946                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5947                 .rpc_argp = &args,
5948                 .rpc_resp = &res,
5949                 .rpc_cred = cred,
5950         };
5951
5952         nfs4_init_boot_verifier(clp, &verifier);
5953         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5954                                                         sizeof(args.id));
5955         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5956                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5957                 args.id_len, args.id);
5958
5959         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5960                                         GFP_NOFS);
5961         if (unlikely(res.server_owner == NULL)) {
5962                 status = -ENOMEM;
5963                 goto out;
5964         }
5965
5966         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5967                                         GFP_NOFS);
5968         if (unlikely(res.server_scope == NULL)) {
5969                 status = -ENOMEM;
5970                 goto out_server_owner;
5971         }
5972
5973         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5974         if (unlikely(res.impl_id == NULL)) {
5975                 status = -ENOMEM;
5976                 goto out_server_scope;
5977         }
5978
5979         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5980         if (status == 0)
5981                 status = nfs4_check_cl_exchange_flags(res.flags);
5982
5983         if (status == 0) {
5984                 clp->cl_clientid = res.clientid;
5985                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5986                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5987                         clp->cl_seqid = res.seqid;
5988
5989                 kfree(clp->cl_serverowner);
5990                 clp->cl_serverowner = res.server_owner;
5991                 res.server_owner = NULL;
5992
5993                 /* use the most recent implementation id */
5994                 kfree(clp->cl_implid);
5995                 clp->cl_implid = res.impl_id;
5996
5997                 if (clp->cl_serverscope != NULL &&
5998                     !nfs41_same_server_scope(clp->cl_serverscope,
5999                                              res.server_scope)) {
6000                         dprintk("%s: server_scope mismatch detected\n",
6001                                 __func__);
6002                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6003                         kfree(clp->cl_serverscope);
6004                         clp->cl_serverscope = NULL;
6005                 }
6006
6007                 if (clp->cl_serverscope == NULL) {
6008                         clp->cl_serverscope = res.server_scope;
6009                         goto out;
6010                 }
6011         } else
6012                 kfree(res.impl_id);
6013
6014 out_server_owner:
6015         kfree(res.server_owner);
6016 out_server_scope:
6017         kfree(res.server_scope);
6018 out:
6019         if (clp->cl_implid != NULL)
6020                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6021                         "domain: %s, name: %s, date: %llu,%u\n",
6022                         clp->cl_implid->domain, clp->cl_implid->name,
6023                         clp->cl_implid->date.seconds,
6024                         clp->cl_implid->date.nseconds);
6025         dprintk("NFS reply exchange_id: %d\n", status);
6026         return status;
6027 }
6028
6029 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6030                 struct rpc_cred *cred)
6031 {
6032         struct rpc_message msg = {
6033                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6034                 .rpc_argp = clp,
6035                 .rpc_cred = cred,
6036         };
6037         int status;
6038
6039         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6040         if (status)
6041                 dprintk("NFS: Got error %d from the server %s on "
6042                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6043         return status;
6044 }
6045
6046 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6047                 struct rpc_cred *cred)
6048 {
6049         unsigned int loop;
6050         int ret;
6051
6052         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6053                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6054                 switch (ret) {
6055                 case -NFS4ERR_DELAY:
6056                 case -NFS4ERR_CLIENTID_BUSY:
6057                         ssleep(1);
6058                         break;
6059                 default:
6060                         return ret;
6061                 }
6062         }
6063         return 0;
6064 }
6065
6066 int nfs4_destroy_clientid(struct nfs_client *clp)
6067 {
6068         struct rpc_cred *cred;
6069         int ret = 0;
6070
6071         if (clp->cl_mvops->minor_version < 1)
6072                 goto out;
6073         if (clp->cl_exchange_flags == 0)
6074                 goto out;
6075         if (clp->cl_preserve_clid)
6076                 goto out;
6077         cred = nfs4_get_clid_cred(clp);
6078         ret = nfs4_proc_destroy_clientid(clp, cred);
6079         if (cred)
6080                 put_rpccred(cred);
6081         switch (ret) {
6082         case 0:
6083         case -NFS4ERR_STALE_CLIENTID:
6084                 clp->cl_exchange_flags = 0;
6085         }
6086 out:
6087         return ret;
6088 }
6089
6090 struct nfs4_get_lease_time_data {
6091         struct nfs4_get_lease_time_args *args;
6092         struct nfs4_get_lease_time_res *res;
6093         struct nfs_client *clp;
6094 };
6095
6096 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6097                                         void *calldata)
6098 {
6099         struct nfs4_get_lease_time_data *data =
6100                         (struct nfs4_get_lease_time_data *)calldata;
6101
6102         dprintk("--> %s\n", __func__);
6103         /* just setup sequence, do not trigger session recovery
6104            since we're invoked within one */
6105         nfs41_setup_sequence(data->clp->cl_session,
6106                         &data->args->la_seq_args,
6107                         &data->res->lr_seq_res,
6108                         task);
6109         dprintk("<-- %s\n", __func__);
6110 }
6111
6112 /*
6113  * Called from nfs4_state_manager thread for session setup, so don't recover
6114  * from sequence operation or clientid errors.
6115  */
6116 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6117 {
6118         struct nfs4_get_lease_time_data *data =
6119                         (struct nfs4_get_lease_time_data *)calldata;
6120
6121         dprintk("--> %s\n", __func__);
6122         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6123                 return;
6124         switch (task->tk_status) {
6125         case -NFS4ERR_DELAY:
6126         case -NFS4ERR_GRACE:
6127                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6128                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6129                 task->tk_status = 0;
6130                 /* fall through */
6131         case -NFS4ERR_RETRY_UNCACHED_REP:
6132                 rpc_restart_call_prepare(task);
6133                 return;
6134         }
6135         dprintk("<-- %s\n", __func__);
6136 }
6137
6138 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6139         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6140         .rpc_call_done = nfs4_get_lease_time_done,
6141 };
6142
6143 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6144 {
6145         struct rpc_task *task;
6146         struct nfs4_get_lease_time_args args;
6147         struct nfs4_get_lease_time_res res = {
6148                 .lr_fsinfo = fsinfo,
6149         };
6150         struct nfs4_get_lease_time_data data = {
6151                 .args = &args,
6152                 .res = &res,
6153                 .clp = clp,
6154         };
6155         struct rpc_message msg = {
6156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6157                 .rpc_argp = &args,
6158                 .rpc_resp = &res,
6159         };
6160         struct rpc_task_setup task_setup = {
6161                 .rpc_client = clp->cl_rpcclient,
6162                 .rpc_message = &msg,
6163                 .callback_ops = &nfs4_get_lease_time_ops,
6164                 .callback_data = &data,
6165                 .flags = RPC_TASK_TIMEOUT,
6166         };
6167         int status;
6168
6169         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6170         nfs4_set_sequence_privileged(&args.la_seq_args);
6171         dprintk("--> %s\n", __func__);
6172         task = rpc_run_task(&task_setup);
6173
6174         if (IS_ERR(task))
6175                 status = PTR_ERR(task);
6176         else {
6177                 status = task->tk_status;
6178                 rpc_put_task(task);
6179         }
6180         dprintk("<-- %s return %d\n", __func__, status);
6181
6182         return status;
6183 }
6184
6185 /*
6186  * Initialize the values to be used by the client in CREATE_SESSION
6187  * If nfs4_init_session set the fore channel request and response sizes,
6188  * use them.
6189  *
6190  * Set the back channel max_resp_sz_cached to zero to force the client to
6191  * always set csa_cachethis to FALSE because the current implementation
6192  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6193  */
6194 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6195 {
6196         unsigned int max_rqst_sz, max_resp_sz;
6197
6198         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6199         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6200
6201         /* Fore channel attributes */
6202         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6203         args->fc_attrs.max_resp_sz = max_resp_sz;
6204         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6205         args->fc_attrs.max_reqs = max_session_slots;
6206
6207         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6208                 "max_ops=%u max_reqs=%u\n",
6209                 __func__,
6210                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6211                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6212
6213         /* Back channel attributes */
6214         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6215         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6216         args->bc_attrs.max_resp_sz_cached = 0;
6217         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6218         args->bc_attrs.max_reqs = 1;
6219
6220         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6221                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6222                 __func__,
6223                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6224                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6225                 args->bc_attrs.max_reqs);
6226 }
6227
6228 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6229 {
6230         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6231         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6232
6233         if (rcvd->max_resp_sz > sent->max_resp_sz)
6234                 return -EINVAL;
6235         /*
6236          * Our requested max_ops is the minimum we need; we're not
6237          * prepared to break up compounds into smaller pieces than that.
6238          * So, no point even trying to continue if the server won't
6239          * cooperate:
6240          */
6241         if (rcvd->max_ops < sent->max_ops)
6242                 return -EINVAL;
6243         if (rcvd->max_reqs == 0)
6244                 return -EINVAL;
6245         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6246                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6247         return 0;
6248 }
6249
6250 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6251 {
6252         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6253         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6254
6255         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6256                 return -EINVAL;
6257         if (rcvd->max_resp_sz < sent->max_resp_sz)
6258                 return -EINVAL;
6259         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6260                 return -EINVAL;
6261         /* These would render the backchannel useless: */
6262         if (rcvd->max_ops != sent->max_ops)
6263                 return -EINVAL;
6264         if (rcvd->max_reqs != sent->max_reqs)
6265                 return -EINVAL;
6266         return 0;
6267 }
6268
6269 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6270                                      struct nfs4_session *session)
6271 {
6272         int ret;
6273
6274         ret = nfs4_verify_fore_channel_attrs(args, session);
6275         if (ret)
6276                 return ret;
6277         return nfs4_verify_back_channel_attrs(args, session);
6278 }
6279
6280 static int _nfs4_proc_create_session(struct nfs_client *clp,
6281                 struct rpc_cred *cred)
6282 {
6283         struct nfs4_session *session = clp->cl_session;
6284         struct nfs41_create_session_args args = {
6285                 .client = clp,
6286                 .cb_program = NFS4_CALLBACK,
6287         };
6288         struct nfs41_create_session_res res = {
6289                 .client = clp,
6290         };
6291         struct rpc_message msg = {
6292                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6293                 .rpc_argp = &args,
6294                 .rpc_resp = &res,
6295                 .rpc_cred = cred,
6296         };
6297         int status;
6298
6299         nfs4_init_channel_attrs(&args);
6300         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6301
6302         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6303
6304         if (!status) {
6305                 /* Verify the session's negotiated channel_attrs values */
6306                 status = nfs4_verify_channel_attrs(&args, session);
6307                 /* Increment the clientid slot sequence id */
6308                 clp->cl_seqid++;
6309         }
6310
6311         return status;
6312 }
6313
6314 /*
6315  * Issues a CREATE_SESSION operation to the server.
6316  * It is the responsibility of the caller to verify the session is
6317  * expired before calling this routine.
6318  */
6319 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6320 {
6321         int status;
6322         unsigned *ptr;
6323         struct nfs4_session *session = clp->cl_session;
6324
6325         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6326
6327         status = _nfs4_proc_create_session(clp, cred);
6328         if (status)
6329                 goto out;
6330
6331         /* Init or reset the session slot tables */
6332         status = nfs4_setup_session_slot_tables(session);
6333         dprintk("slot table setup returned %d\n", status);
6334         if (status)
6335                 goto out;
6336
6337         ptr = (unsigned *)&session->sess_id.data[0];
6338         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6339                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6340 out:
6341         dprintk("<-- %s\n", __func__);
6342         return status;
6343 }
6344
6345 /*
6346  * Issue the over-the-wire RPC DESTROY_SESSION.
6347  * The caller must serialize access to this routine.
6348  */
6349 int nfs4_proc_destroy_session(struct nfs4_session *session,
6350                 struct rpc_cred *cred)
6351 {
6352         struct rpc_message msg = {
6353                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6354                 .rpc_argp = session,
6355                 .rpc_cred = cred,
6356         };
6357         int status = 0;
6358
6359         dprintk("--> nfs4_proc_destroy_session\n");
6360
6361         /* session is still being setup */
6362         if (session->clp->cl_cons_state != NFS_CS_READY)
6363                 return status;
6364
6365         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6366
6367         if (status)
6368                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6369                         "Session has been destroyed regardless...\n", status);
6370
6371         dprintk("<-- nfs4_proc_destroy_session\n");
6372         return status;
6373 }
6374
6375 /*
6376  * Renew the cl_session lease.
6377  */
6378 struct nfs4_sequence_data {
6379         struct nfs_client *clp;
6380         struct nfs4_sequence_args args;
6381         struct nfs4_sequence_res res;
6382 };
6383
6384 static void nfs41_sequence_release(void *data)
6385 {
6386         struct nfs4_sequence_data *calldata = data;
6387         struct nfs_client *clp = calldata->clp;
6388
6389         if (atomic_read(&clp->cl_count) > 1)
6390                 nfs4_schedule_state_renewal(clp);
6391         nfs_put_client(clp);
6392         kfree(calldata);
6393 }
6394
6395 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6396 {
6397         switch(task->tk_status) {
6398         case -NFS4ERR_DELAY:
6399                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6400                 return -EAGAIN;
6401         default:
6402                 nfs4_schedule_lease_recovery(clp);
6403         }
6404         return 0;
6405 }
6406
6407 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6408 {
6409         struct nfs4_sequence_data *calldata = data;
6410         struct nfs_client *clp = calldata->clp;
6411
6412         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6413                 return;
6414
6415         if (task->tk_status < 0) {
6416                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6417                 if (atomic_read(&clp->cl_count) == 1)
6418                         goto out;
6419
6420                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6421                         rpc_restart_call_prepare(task);
6422                         return;
6423                 }
6424         }
6425         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6426 out:
6427         dprintk("<-- %s\n", __func__);
6428 }
6429
6430 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6431 {
6432         struct nfs4_sequence_data *calldata = data;
6433         struct nfs_client *clp = calldata->clp;
6434         struct nfs4_sequence_args *args;
6435         struct nfs4_sequence_res *res;
6436
6437         args = task->tk_msg.rpc_argp;
6438         res = task->tk_msg.rpc_resp;
6439
6440         nfs41_setup_sequence(clp->cl_session, args, res, task);
6441 }
6442
6443 static const struct rpc_call_ops nfs41_sequence_ops = {
6444         .rpc_call_done = nfs41_sequence_call_done,
6445         .rpc_call_prepare = nfs41_sequence_prepare,
6446         .rpc_release = nfs41_sequence_release,
6447 };
6448
6449 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6450                 struct rpc_cred *cred,
6451                 bool is_privileged)
6452 {
6453         struct nfs4_sequence_data *calldata;
6454         struct rpc_message msg = {
6455                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6456                 .rpc_cred = cred,
6457         };
6458         struct rpc_task_setup task_setup_data = {
6459                 .rpc_client = clp->cl_rpcclient,
6460                 .rpc_message = &msg,
6461                 .callback_ops = &nfs41_sequence_ops,
6462                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6463         };
6464
6465         if (!atomic_inc_not_zero(&clp->cl_count))
6466                 return ERR_PTR(-EIO);
6467         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6468         if (calldata == NULL) {
6469                 nfs_put_client(clp);
6470                 return ERR_PTR(-ENOMEM);
6471         }
6472         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6473         if (is_privileged)
6474                 nfs4_set_sequence_privileged(&calldata->args);
6475         msg.rpc_argp = &calldata->args;
6476         msg.rpc_resp = &calldata->res;
6477         calldata->clp = clp;
6478         task_setup_data.callback_data = calldata;
6479
6480         return rpc_run_task(&task_setup_data);
6481 }
6482
6483 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6484 {
6485         struct rpc_task *task;
6486         int ret = 0;
6487
6488         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6489                 return 0;
6490         task = _nfs41_proc_sequence(clp, cred, false);
6491         if (IS_ERR(task))
6492                 ret = PTR_ERR(task);
6493         else
6494                 rpc_put_task_async(task);
6495         dprintk("<-- %s status=%d\n", __func__, ret);
6496         return ret;
6497 }
6498
6499 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6500 {
6501         struct rpc_task *task;
6502         int ret;
6503
6504         task = _nfs41_proc_sequence(clp, cred, true);
6505         if (IS_ERR(task)) {
6506                 ret = PTR_ERR(task);
6507                 goto out;
6508         }
6509         ret = rpc_wait_for_completion_task(task);
6510         if (!ret) {
6511                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6512
6513                 if (task->tk_status == 0)
6514                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6515                 ret = task->tk_status;
6516         }
6517         rpc_put_task(task);
6518 out:
6519         dprintk("<-- %s status=%d\n", __func__, ret);
6520         return ret;
6521 }
6522
6523 struct nfs4_reclaim_complete_data {
6524         struct nfs_client *clp;
6525         struct nfs41_reclaim_complete_args arg;
6526         struct nfs41_reclaim_complete_res res;
6527 };
6528
6529 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6530 {
6531         struct nfs4_reclaim_complete_data *calldata = data;
6532
6533         nfs41_setup_sequence(calldata->clp->cl_session,
6534                         &calldata->arg.seq_args,
6535                         &calldata->res.seq_res,
6536                         task);
6537 }
6538
6539 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6540 {
6541         switch(task->tk_status) {
6542         case 0:
6543         case -NFS4ERR_COMPLETE_ALREADY:
6544         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6545                 break;
6546         case -NFS4ERR_DELAY:
6547                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6548                 /* fall through */
6549         case -NFS4ERR_RETRY_UNCACHED_REP:
6550                 return -EAGAIN;
6551         default:
6552                 nfs4_schedule_lease_recovery(clp);
6553         }
6554         return 0;
6555 }
6556
6557 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6558 {
6559         struct nfs4_reclaim_complete_data *calldata = data;
6560         struct nfs_client *clp = calldata->clp;
6561         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6562
6563         dprintk("--> %s\n", __func__);
6564         if (!nfs41_sequence_done(task, res))
6565                 return;
6566
6567         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6568                 rpc_restart_call_prepare(task);
6569                 return;
6570         }
6571         dprintk("<-- %s\n", __func__);
6572 }
6573
6574 static void nfs4_free_reclaim_complete_data(void *data)
6575 {
6576         struct nfs4_reclaim_complete_data *calldata = data;
6577
6578         kfree(calldata);
6579 }
6580
6581 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6582         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6583         .rpc_call_done = nfs4_reclaim_complete_done,
6584         .rpc_release = nfs4_free_reclaim_complete_data,
6585 };
6586
6587 /*
6588  * Issue a global reclaim complete.
6589  */
6590 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
6591                 struct rpc_cred *cred)
6592 {
6593         struct nfs4_reclaim_complete_data *calldata;
6594         struct rpc_task *task;
6595         struct rpc_message msg = {
6596                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6597                 .rpc_cred = cred,
6598         };
6599         struct rpc_task_setup task_setup_data = {
6600                 .rpc_client = clp->cl_rpcclient,
6601                 .rpc_message = &msg,
6602                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6603                 .flags = RPC_TASK_ASYNC,
6604         };
6605         int status = -ENOMEM;
6606
6607         dprintk("--> %s\n", __func__);
6608         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6609         if (calldata == NULL)
6610                 goto out;
6611         calldata->clp = clp;
6612         calldata->arg.one_fs = 0;
6613
6614         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6615         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6616         msg.rpc_argp = &calldata->arg;
6617         msg.rpc_resp = &calldata->res;
6618         task_setup_data.callback_data = calldata;
6619         task = rpc_run_task(&task_setup_data);
6620         if (IS_ERR(task)) {
6621                 status = PTR_ERR(task);
6622                 goto out;
6623         }
6624         status = nfs4_wait_for_completion_rpc_task(task);
6625         if (status == 0)
6626                 status = task->tk_status;
6627         rpc_put_task(task);
6628         return 0;
6629 out:
6630         dprintk("<-- %s status=%d\n", __func__, status);
6631         return status;
6632 }
6633
6634 static void
6635 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6636 {
6637         struct nfs4_layoutget *lgp = calldata;
6638         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6639         struct nfs4_session *session = nfs4_get_session(server);
6640
6641         dprintk("--> %s\n", __func__);
6642         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6643          * right now covering the LAYOUTGET we are about to send.
6644          * However, that is not so catastrophic, and there seems
6645          * to be no way to prevent it completely.
6646          */
6647         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6648                                 &lgp->res.seq_res, task))
6649                 return;
6650         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6651                                           NFS_I(lgp->args.inode)->layout,
6652                                           lgp->args.ctx->state)) {
6653                 rpc_exit(task, NFS4_OK);
6654         }
6655 }
6656
6657 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6658 {
6659         struct nfs4_layoutget *lgp = calldata;
6660         struct inode *inode = lgp->args.inode;
6661         struct nfs_server *server = NFS_SERVER(inode);
6662         struct pnfs_layout_hdr *lo;
6663         struct nfs4_state *state = NULL;
6664         unsigned long timeo, giveup;
6665
6666         dprintk("--> %s\n", __func__);
6667
6668         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6669                 goto out;
6670
6671         switch (task->tk_status) {
6672         case 0:
6673                 goto out;
6674         case -NFS4ERR_LAYOUTTRYLATER:
6675         case -NFS4ERR_RECALLCONFLICT:
6676                 timeo = rpc_get_timeout(task->tk_client);
6677                 giveup = lgp->args.timestamp + timeo;
6678                 if (time_after(giveup, jiffies))
6679                         task->tk_status = -NFS4ERR_DELAY;
6680                 break;
6681         case -NFS4ERR_EXPIRED:
6682         case -NFS4ERR_BAD_STATEID:
6683                 spin_lock(&inode->i_lock);
6684                 lo = NFS_I(inode)->layout;
6685                 if (!lo || list_empty(&lo->plh_segs)) {
6686                         spin_unlock(&inode->i_lock);
6687                         /* If the open stateid was bad, then recover it. */
6688                         state = lgp->args.ctx->state;
6689                 } else {
6690                         LIST_HEAD(head);
6691
6692                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6693                         spin_unlock(&inode->i_lock);
6694                         /* Mark the bad layout state as invalid, then
6695                          * retry using the open stateid. */
6696                         pnfs_free_lseg_list(&head);
6697                 }
6698         }
6699         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6700                 rpc_restart_call_prepare(task);
6701 out:
6702         dprintk("<-- %s\n", __func__);
6703 }
6704
6705 static size_t max_response_pages(struct nfs_server *server)
6706 {
6707         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6708         return nfs_page_array_len(0, max_resp_sz);
6709 }
6710
6711 static void nfs4_free_pages(struct page **pages, size_t size)
6712 {
6713         int i;
6714
6715         if (!pages)
6716                 return;
6717
6718         for (i = 0; i < size; i++) {
6719                 if (!pages[i])
6720                         break;
6721                 __free_page(pages[i]);
6722         }
6723         kfree(pages);
6724 }
6725
6726 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6727 {
6728         struct page **pages;
6729         int i;
6730
6731         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6732         if (!pages) {
6733                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6734                 return NULL;
6735         }
6736
6737         for (i = 0; i < size; i++) {
6738                 pages[i] = alloc_page(gfp_flags);
6739                 if (!pages[i]) {
6740                         dprintk("%s: failed to allocate page\n", __func__);
6741                         nfs4_free_pages(pages, size);
6742                         return NULL;
6743                 }
6744         }
6745
6746         return pages;
6747 }
6748
6749 static void nfs4_layoutget_release(void *calldata)
6750 {
6751         struct nfs4_layoutget *lgp = calldata;
6752         struct inode *inode = lgp->args.inode;
6753         struct nfs_server *server = NFS_SERVER(inode);
6754         size_t max_pages = max_response_pages(server);
6755
6756         dprintk("--> %s\n", __func__);
6757         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6758         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6759         put_nfs_open_context(lgp->args.ctx);
6760         kfree(calldata);
6761         dprintk("<-- %s\n", __func__);
6762 }
6763
6764 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6765         .rpc_call_prepare = nfs4_layoutget_prepare,
6766         .rpc_call_done = nfs4_layoutget_done,
6767         .rpc_release = nfs4_layoutget_release,
6768 };
6769
6770 struct pnfs_layout_segment *
6771 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6772 {
6773         struct inode *inode = lgp->args.inode;
6774         struct nfs_server *server = NFS_SERVER(inode);
6775         size_t max_pages = max_response_pages(server);
6776         struct rpc_task *task;
6777         struct rpc_message msg = {
6778                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6779                 .rpc_argp = &lgp->args,
6780                 .rpc_resp = &lgp->res,
6781                 .rpc_cred = lgp->cred,
6782         };
6783         struct rpc_task_setup task_setup_data = {
6784                 .rpc_client = server->client,
6785                 .rpc_message = &msg,
6786                 .callback_ops = &nfs4_layoutget_call_ops,
6787                 .callback_data = lgp,
6788                 .flags = RPC_TASK_ASYNC,
6789         };
6790         struct pnfs_layout_segment *lseg = NULL;
6791         int status = 0;
6792
6793         dprintk("--> %s\n", __func__);
6794
6795         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6796         if (!lgp->args.layout.pages) {
6797                 nfs4_layoutget_release(lgp);
6798                 return ERR_PTR(-ENOMEM);
6799         }
6800         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6801         lgp->args.timestamp = jiffies;
6802
6803         lgp->res.layoutp = &lgp->args.layout;
6804         lgp->res.seq_res.sr_slot = NULL;
6805         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6806
6807         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6808         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6809
6810         task = rpc_run_task(&task_setup_data);
6811         if (IS_ERR(task))
6812                 return ERR_CAST(task);
6813         status = nfs4_wait_for_completion_rpc_task(task);
6814         if (status == 0)
6815                 status = task->tk_status;
6816         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6817         if (status == 0 && lgp->res.layoutp->len)
6818                 lseg = pnfs_layout_process(lgp);
6819         rpc_put_task(task);
6820         dprintk("<-- %s status=%d\n", __func__, status);
6821         if (status)
6822                 return ERR_PTR(status);
6823         return lseg;
6824 }
6825
6826 static void
6827 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6828 {
6829         struct nfs4_layoutreturn *lrp = calldata;
6830
6831         dprintk("--> %s\n", __func__);
6832         nfs41_setup_sequence(lrp->clp->cl_session,
6833                         &lrp->args.seq_args,
6834                         &lrp->res.seq_res,
6835                         task);
6836 }
6837
6838 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6839 {
6840         struct nfs4_layoutreturn *lrp = calldata;
6841         struct nfs_server *server;
6842
6843         dprintk("--> %s\n", __func__);
6844
6845         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6846                 return;
6847
6848         server = NFS_SERVER(lrp->args.inode);
6849         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6850                 rpc_restart_call_prepare(task);
6851                 return;
6852         }
6853         dprintk("<-- %s\n", __func__);
6854 }
6855
6856 static void nfs4_layoutreturn_release(void *calldata)
6857 {
6858         struct nfs4_layoutreturn *lrp = calldata;
6859         struct pnfs_layout_hdr *lo = lrp->args.layout;
6860
6861         dprintk("--> %s\n", __func__);
6862         spin_lock(&lo->plh_inode->i_lock);
6863         if (lrp->res.lrs_present)
6864                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6865         lo->plh_block_lgets--;
6866         spin_unlock(&lo->plh_inode->i_lock);
6867         pnfs_put_layout_hdr(lrp->args.layout);
6868         kfree(calldata);
6869         dprintk("<-- %s\n", __func__);
6870 }
6871
6872 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6873         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6874         .rpc_call_done = nfs4_layoutreturn_done,
6875         .rpc_release = nfs4_layoutreturn_release,
6876 };
6877
6878 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6879 {
6880         struct rpc_task *task;
6881         struct rpc_message msg = {
6882                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6883                 .rpc_argp = &lrp->args,
6884                 .rpc_resp = &lrp->res,
6885                 .rpc_cred = lrp->cred,
6886         };
6887         struct rpc_task_setup task_setup_data = {
6888                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
6889                 .rpc_message = &msg,
6890                 .callback_ops = &nfs4_layoutreturn_call_ops,
6891                 .callback_data = lrp,
6892         };
6893         int status;
6894
6895         dprintk("--> %s\n", __func__);
6896         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6897         task = rpc_run_task(&task_setup_data);
6898         if (IS_ERR(task))
6899                 return PTR_ERR(task);
6900         status = task->tk_status;
6901         dprintk("<-- %s status=%d\n", __func__, status);
6902         rpc_put_task(task);
6903         return status;
6904 }
6905
6906 /*
6907  * Retrieve the list of Data Server devices from the MDS.
6908  */
6909 static int _nfs4_getdevicelist(struct nfs_server *server,
6910                                     const struct nfs_fh *fh,
6911                                     struct pnfs_devicelist *devlist)
6912 {
6913         struct nfs4_getdevicelist_args args = {
6914                 .fh = fh,
6915                 .layoutclass = server->pnfs_curr_ld->id,
6916         };
6917         struct nfs4_getdevicelist_res res = {
6918                 .devlist = devlist,
6919         };
6920         struct rpc_message msg = {
6921                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6922                 .rpc_argp = &args,
6923                 .rpc_resp = &res,
6924         };
6925         int status;
6926
6927         dprintk("--> %s\n", __func__);
6928         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6929                                 &res.seq_res, 0);
6930         dprintk("<-- %s status=%d\n", __func__, status);
6931         return status;
6932 }
6933
6934 int nfs4_proc_getdevicelist(struct nfs_server *server,
6935                             const struct nfs_fh *fh,
6936                             struct pnfs_devicelist *devlist)
6937 {
6938         struct nfs4_exception exception = { };
6939         int err;
6940
6941         do {
6942                 err = nfs4_handle_exception(server,
6943                                 _nfs4_getdevicelist(server, fh, devlist),
6944                                 &exception);
6945         } while (exception.retry);
6946
6947         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6948                 err, devlist->num_devs);
6949
6950         return err;
6951 }
6952 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6953
6954 static int
6955 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
6956                 struct pnfs_device *pdev,
6957                 struct rpc_cred *cred)
6958 {
6959         struct nfs4_getdeviceinfo_args args = {
6960                 .pdev = pdev,
6961         };
6962         struct nfs4_getdeviceinfo_res res = {
6963                 .pdev = pdev,
6964         };
6965         struct rpc_message msg = {
6966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6967                 .rpc_argp = &args,
6968                 .rpc_resp = &res,
6969                 .rpc_cred = cred,
6970         };
6971         int status;
6972
6973         dprintk("--> %s\n", __func__);
6974         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6975         dprintk("<-- %s status=%d\n", __func__, status);
6976
6977         return status;
6978 }
6979
6980 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
6981                 struct pnfs_device *pdev,
6982                 struct rpc_cred *cred)
6983 {
6984         struct nfs4_exception exception = { };
6985         int err;
6986
6987         do {
6988                 err = nfs4_handle_exception(server,
6989                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
6990                                         &exception);
6991         } while (exception.retry);
6992         return err;
6993 }
6994 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6995
6996 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6997 {
6998         struct nfs4_layoutcommit_data *data = calldata;
6999         struct nfs_server *server = NFS_SERVER(data->args.inode);
7000         struct nfs4_session *session = nfs4_get_session(server);
7001
7002         nfs41_setup_sequence(session,
7003                         &data->args.seq_args,
7004                         &data->res.seq_res,
7005                         task);
7006 }
7007
7008 static void
7009 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7010 {
7011         struct nfs4_layoutcommit_data *data = calldata;
7012         struct nfs_server *server = NFS_SERVER(data->args.inode);
7013
7014         if (!nfs41_sequence_done(task, &data->res.seq_res))
7015                 return;
7016
7017         switch (task->tk_status) { /* Just ignore these failures */
7018         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7019         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7020         case -NFS4ERR_BADLAYOUT:     /* no layout */
7021         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7022                 task->tk_status = 0;
7023                 break;
7024         case 0:
7025                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7026                                                    data->res.fattr);
7027                 break;
7028         default:
7029                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7030                         rpc_restart_call_prepare(task);
7031                         return;
7032                 }
7033         }
7034 }
7035
7036 static void nfs4_layoutcommit_release(void *calldata)
7037 {
7038         struct nfs4_layoutcommit_data *data = calldata;
7039
7040         pnfs_cleanup_layoutcommit(data);
7041         put_rpccred(data->cred);
7042         kfree(data);
7043 }
7044
7045 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7046         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7047         .rpc_call_done = nfs4_layoutcommit_done,
7048         .rpc_release = nfs4_layoutcommit_release,
7049 };
7050
7051 int
7052 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7053 {
7054         struct rpc_message msg = {
7055                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7056                 .rpc_argp = &data->args,
7057                 .rpc_resp = &data->res,
7058                 .rpc_cred = data->cred,
7059         };
7060         struct rpc_task_setup task_setup_data = {
7061                 .task = &data->task,
7062                 .rpc_client = NFS_CLIENT(data->args.inode),
7063                 .rpc_message = &msg,
7064                 .callback_ops = &nfs4_layoutcommit_ops,
7065                 .callback_data = data,
7066                 .flags = RPC_TASK_ASYNC,
7067         };
7068         struct rpc_task *task;
7069         int status = 0;
7070
7071         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7072                 "lbw: %llu inode %lu\n",
7073                 data->task.tk_pid, sync,
7074                 data->args.lastbytewritten,
7075                 data->args.inode->i_ino);
7076
7077         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7078         task = rpc_run_task(&task_setup_data);
7079         if (IS_ERR(task))
7080                 return PTR_ERR(task);
7081         if (sync == false)
7082                 goto out;
7083         status = nfs4_wait_for_completion_rpc_task(task);
7084         if (status != 0)
7085                 goto out;
7086         status = task->tk_status;
7087 out:
7088         dprintk("%s: status %d\n", __func__, status);
7089         rpc_put_task(task);
7090         return status;
7091 }
7092
7093 /**
7094  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7095  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7096  */
7097 static int
7098 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7099                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7100 {
7101         struct nfs41_secinfo_no_name_args args = {
7102                 .style = SECINFO_STYLE_CURRENT_FH,
7103         };
7104         struct nfs4_secinfo_res res = {
7105                 .flavors = flavors,
7106         };
7107         struct rpc_message msg = {
7108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7109                 .rpc_argp = &args,
7110                 .rpc_resp = &res,
7111         };
7112         return nfs4_call_sync(server->nfs_client->cl_rpcclient, server, &msg,
7113                                 &args.seq_args, &res.seq_res, 0);
7114 }
7115
7116 static int
7117 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7118                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7119 {
7120         struct nfs4_exception exception = { };
7121         int err;
7122         do {
7123                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7124                 switch (err) {
7125                 case 0:
7126                 case -NFS4ERR_WRONGSEC:
7127                 case -NFS4ERR_NOTSUPP:
7128                         goto out;
7129                 default:
7130                         err = nfs4_handle_exception(server, err, &exception);
7131                 }
7132         } while (exception.retry);
7133 out:
7134         return err;
7135 }
7136
7137 static int
7138 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7139                     struct nfs_fsinfo *info)
7140 {
7141         int err;
7142         struct page *page;
7143         rpc_authflavor_t flavor;
7144         struct nfs4_secinfo_flavors *flavors;
7145
7146         page = alloc_page(GFP_KERNEL);
7147         if (!page) {
7148                 err = -ENOMEM;
7149                 goto out;
7150         }
7151
7152         flavors = page_address(page);
7153         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7154
7155         /*
7156          * Fall back on "guess and check" method if
7157          * the server doesn't support SECINFO_NO_NAME
7158          */
7159         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7160                 err = nfs4_find_root_sec(server, fhandle, info);
7161                 goto out_freepage;
7162         }
7163         if (err)
7164                 goto out_freepage;
7165
7166         flavor = nfs_find_best_sec(flavors);
7167         if (err == 0)
7168                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
7169
7170 out_freepage:
7171         put_page(page);
7172         if (err == -EACCES)
7173                 return -EPERM;
7174 out:
7175         return err;
7176 }
7177
7178 static int _nfs41_test_stateid(struct nfs_server *server,
7179                 nfs4_stateid *stateid,
7180                 struct rpc_cred *cred)
7181 {
7182         int status;
7183         struct nfs41_test_stateid_args args = {
7184                 .stateid = stateid,
7185         };
7186         struct nfs41_test_stateid_res res;
7187         struct rpc_message msg = {
7188                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7189                 .rpc_argp = &args,
7190                 .rpc_resp = &res,
7191                 .rpc_cred = cred,
7192         };
7193
7194         dprintk("NFS call  test_stateid %p\n", stateid);
7195         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
7196         nfs4_set_sequence_privileged(&args.seq_args);
7197         status = nfs4_call_sync_sequence(server->client, server, &msg,
7198                         &args.seq_args, &res.seq_res);
7199         if (status != NFS_OK) {
7200                 dprintk("NFS reply test_stateid: failed, %d\n", status);
7201                 return status;
7202         }
7203         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7204         return -res.status;
7205 }
7206
7207 /**
7208  * nfs41_test_stateid - perform a TEST_STATEID operation
7209  *
7210  * @server: server / transport on which to perform the operation
7211  * @stateid: state ID to test
7212  * @cred: credential
7213  *
7214  * Returns NFS_OK if the server recognizes that "stateid" is valid.
7215  * Otherwise a negative NFS4ERR value is returned if the operation
7216  * failed or the state ID is not currently valid.
7217  */
7218 static int nfs41_test_stateid(struct nfs_server *server,
7219                 nfs4_stateid *stateid,
7220                 struct rpc_cred *cred)
7221 {
7222         struct nfs4_exception exception = { };
7223         int err;
7224         do {
7225                 err = _nfs41_test_stateid(server, stateid, cred);
7226                 if (err != -NFS4ERR_DELAY)
7227                         break;
7228                 nfs4_handle_exception(server, err, &exception);
7229         } while (exception.retry);
7230         return err;
7231 }
7232
7233 struct nfs_free_stateid_data {
7234         struct nfs_server *server;
7235         struct nfs41_free_stateid_args args;
7236         struct nfs41_free_stateid_res res;
7237 };
7238
7239 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
7240 {
7241         struct nfs_free_stateid_data *data = calldata;
7242         nfs41_setup_sequence(nfs4_get_session(data->server),
7243                         &data->args.seq_args,
7244                         &data->res.seq_res,
7245                         task);
7246 }
7247
7248 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
7249 {
7250         struct nfs_free_stateid_data *data = calldata;
7251
7252         nfs41_sequence_done(task, &data->res.seq_res);
7253
7254         switch (task->tk_status) {
7255         case -NFS4ERR_DELAY:
7256                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
7257                         rpc_restart_call_prepare(task);
7258         }
7259 }
7260
7261 static void nfs41_free_stateid_release(void *calldata)
7262 {
7263         kfree(calldata);
7264 }
7265
7266 const struct rpc_call_ops nfs41_free_stateid_ops = {
7267         .rpc_call_prepare = nfs41_free_stateid_prepare,
7268         .rpc_call_done = nfs41_free_stateid_done,
7269         .rpc_release = nfs41_free_stateid_release,
7270 };
7271
7272 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
7273                 nfs4_stateid *stateid,
7274                 struct rpc_cred *cred,
7275                 bool privileged)
7276 {
7277         struct rpc_message msg = {
7278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7279                 .rpc_cred = cred,
7280         };
7281         struct rpc_task_setup task_setup = {
7282                 .rpc_client = server->client,
7283                 .rpc_message = &msg,
7284                 .callback_ops = &nfs41_free_stateid_ops,
7285                 .flags = RPC_TASK_ASYNC,
7286         };
7287         struct nfs_free_stateid_data *data;
7288
7289         dprintk("NFS call  free_stateid %p\n", stateid);
7290         data = kmalloc(sizeof(*data), GFP_NOFS);
7291         if (!data)
7292                 return ERR_PTR(-ENOMEM);
7293         data->server = server;
7294         nfs4_stateid_copy(&data->args.stateid, stateid);
7295
7296         task_setup.callback_data = data;
7297
7298         msg.rpc_argp = &data->args;
7299         msg.rpc_resp = &data->res;
7300         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
7301         if (privileged)
7302                 nfs4_set_sequence_privileged(&data->args.seq_args);
7303
7304         return rpc_run_task(&task_setup);
7305 }
7306
7307 /**
7308  * nfs41_free_stateid - perform a FREE_STATEID operation
7309  *
7310  * @server: server / transport on which to perform the operation
7311  * @stateid: state ID to release
7312  * @cred: credential
7313  *
7314  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7315  * negative NFS4ERR value is returned.
7316  */
7317 static int nfs41_free_stateid(struct nfs_server *server,
7318                 nfs4_stateid *stateid,
7319                 struct rpc_cred *cred)
7320 {
7321         struct rpc_task *task;
7322         int ret;
7323
7324         task = _nfs41_free_stateid(server, stateid, cred, true);
7325         if (IS_ERR(task))
7326                 return PTR_ERR(task);
7327         ret = rpc_wait_for_completion_task(task);
7328         if (!ret)
7329                 ret = task->tk_status;
7330         rpc_put_task(task);
7331         return ret;
7332 }
7333
7334 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
7335 {
7336         struct rpc_task *task;
7337         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
7338
7339         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
7340         nfs4_free_lock_state(server, lsp);
7341         if (IS_ERR(task))
7342                 return PTR_ERR(task);
7343         rpc_put_task(task);
7344         return 0;
7345 }
7346
7347 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7348                 const nfs4_stateid *s2)
7349 {
7350         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7351                 return false;
7352
7353         if (s1->seqid == s2->seqid)
7354                 return true;
7355         if (s1->seqid == 0 || s2->seqid == 0)
7356                 return true;
7357
7358         return false;
7359 }
7360
7361 #endif /* CONFIG_NFS_V4_1 */
7362
7363 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7364                 const nfs4_stateid *s2)
7365 {
7366         return nfs4_stateid_match(s1, s2);
7367 }
7368
7369
7370 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7371         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7372         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7373         .recover_open   = nfs4_open_reclaim,
7374         .recover_lock   = nfs4_lock_reclaim,
7375         .establish_clid = nfs4_init_clientid,
7376         .detect_trunking = nfs40_discover_server_trunking,
7377 };
7378
7379 #if defined(CONFIG_NFS_V4_1)
7380 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7381         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7382         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7383         .recover_open   = nfs4_open_reclaim,
7384         .recover_lock   = nfs4_lock_reclaim,
7385         .establish_clid = nfs41_init_clientid,
7386         .reclaim_complete = nfs41_proc_reclaim_complete,
7387         .detect_trunking = nfs41_discover_server_trunking,
7388 };
7389 #endif /* CONFIG_NFS_V4_1 */
7390
7391 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7392         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7393         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7394         .recover_open   = nfs4_open_expired,
7395         .recover_lock   = nfs4_lock_expired,
7396         .establish_clid = nfs4_init_clientid,
7397 };
7398
7399 #if defined(CONFIG_NFS_V4_1)
7400 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7401         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7402         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7403         .recover_open   = nfs41_open_expired,
7404         .recover_lock   = nfs41_lock_expired,
7405         .establish_clid = nfs41_init_clientid,
7406 };
7407 #endif /* CONFIG_NFS_V4_1 */
7408
7409 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7410         .sched_state_renewal = nfs4_proc_async_renew,
7411         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7412         .renew_lease = nfs4_proc_renew,
7413 };
7414
7415 #if defined(CONFIG_NFS_V4_1)
7416 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7417         .sched_state_renewal = nfs41_proc_async_sequence,
7418         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7419         .renew_lease = nfs4_proc_sequence,
7420 };
7421 #endif
7422
7423 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7424         .minor_version = 0,
7425         .init_caps = NFS_CAP_READDIRPLUS
7426                 | NFS_CAP_ATOMIC_OPEN
7427                 | NFS_CAP_CHANGE_ATTR
7428                 | NFS_CAP_POSIX_LOCK,
7429         .call_sync = _nfs4_call_sync,
7430         .match_stateid = nfs4_match_stateid,
7431         .find_root_sec = nfs4_find_root_sec,
7432         .free_lock_state = nfs4_release_lockowner,
7433         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7434         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7435         .state_renewal_ops = &nfs40_state_renewal_ops,
7436 };
7437
7438 #if defined(CONFIG_NFS_V4_1)
7439 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7440         .minor_version = 1,
7441         .init_caps = NFS_CAP_READDIRPLUS
7442                 | NFS_CAP_ATOMIC_OPEN
7443                 | NFS_CAP_CHANGE_ATTR
7444                 | NFS_CAP_POSIX_LOCK
7445                 | NFS_CAP_STATEID_NFSV41
7446                 | NFS_CAP_ATOMIC_OPEN_V1,
7447         .call_sync = nfs4_call_sync_sequence,
7448         .match_stateid = nfs41_match_stateid,
7449         .find_root_sec = nfs41_find_root_sec,
7450         .free_lock_state = nfs41_free_lock_state,
7451         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7452         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7453         .state_renewal_ops = &nfs41_state_renewal_ops,
7454 };
7455 #endif
7456
7457 #if defined(CONFIG_NFS_V4_2)
7458 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
7459         .minor_version = 2,
7460         .init_caps = NFS_CAP_READDIRPLUS
7461                 | NFS_CAP_ATOMIC_OPEN
7462                 | NFS_CAP_CHANGE_ATTR
7463                 | NFS_CAP_POSIX_LOCK
7464                 | NFS_CAP_STATEID_NFSV41
7465                 | NFS_CAP_ATOMIC_OPEN_V1,
7466         .call_sync = nfs4_call_sync_sequence,
7467         .match_stateid = nfs41_match_stateid,
7468         .find_root_sec = nfs41_find_root_sec,
7469         .free_lock_state = nfs41_free_lock_state,
7470         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7471         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7472         .state_renewal_ops = &nfs41_state_renewal_ops,
7473 };
7474 #endif
7475
7476 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7477         [0] = &nfs_v4_0_minor_ops,
7478 #if defined(CONFIG_NFS_V4_1)
7479         [1] = &nfs_v4_1_minor_ops,
7480 #endif
7481 #if defined(CONFIG_NFS_V4_2)
7482         [2] = &nfs_v4_2_minor_ops,
7483 #endif
7484 };
7485
7486 const struct inode_operations nfs4_dir_inode_operations = {
7487         .create         = nfs_create,
7488         .lookup         = nfs_lookup,
7489         .atomic_open    = nfs_atomic_open,
7490         .link           = nfs_link,
7491         .unlink         = nfs_unlink,
7492         .symlink        = nfs_symlink,
7493         .mkdir          = nfs_mkdir,
7494         .rmdir          = nfs_rmdir,
7495         .mknod          = nfs_mknod,
7496         .rename         = nfs_rename,
7497         .permission     = nfs_permission,
7498         .getattr        = nfs_getattr,
7499         .setattr        = nfs_setattr,
7500         .getxattr       = generic_getxattr,
7501         .setxattr       = generic_setxattr,
7502         .listxattr      = generic_listxattr,
7503         .removexattr    = generic_removexattr,
7504 };
7505
7506 static const struct inode_operations nfs4_file_inode_operations = {
7507         .permission     = nfs_permission,
7508         .getattr        = nfs_getattr,
7509         .setattr        = nfs_setattr,
7510         .getxattr       = generic_getxattr,
7511         .setxattr       = generic_setxattr,
7512         .listxattr      = generic_listxattr,
7513         .removexattr    = generic_removexattr,
7514 };
7515
7516 const struct nfs_rpc_ops nfs_v4_clientops = {
7517         .version        = 4,                    /* protocol version */
7518         .dentry_ops     = &nfs4_dentry_operations,
7519         .dir_inode_ops  = &nfs4_dir_inode_operations,
7520         .file_inode_ops = &nfs4_file_inode_operations,
7521         .file_ops       = &nfs4_file_operations,
7522         .getroot        = nfs4_proc_get_root,
7523         .submount       = nfs4_submount,
7524         .try_mount      = nfs4_try_mount,
7525         .getattr        = nfs4_proc_getattr,
7526         .setattr        = nfs4_proc_setattr,
7527         .lookup         = nfs4_proc_lookup,
7528         .access         = nfs4_proc_access,
7529         .readlink       = nfs4_proc_readlink,
7530         .create         = nfs4_proc_create,
7531         .remove         = nfs4_proc_remove,
7532         .unlink_setup   = nfs4_proc_unlink_setup,
7533         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7534         .unlink_done    = nfs4_proc_unlink_done,
7535         .rename         = nfs4_proc_rename,
7536         .rename_setup   = nfs4_proc_rename_setup,
7537         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7538         .rename_done    = nfs4_proc_rename_done,
7539         .link           = nfs4_proc_link,
7540         .symlink        = nfs4_proc_symlink,
7541         .mkdir          = nfs4_proc_mkdir,
7542         .rmdir          = nfs4_proc_remove,
7543         .readdir        = nfs4_proc_readdir,
7544         .mknod          = nfs4_proc_mknod,
7545         .statfs         = nfs4_proc_statfs,
7546         .fsinfo         = nfs4_proc_fsinfo,
7547         .pathconf       = nfs4_proc_pathconf,
7548         .set_capabilities = nfs4_server_capabilities,
7549         .decode_dirent  = nfs4_decode_dirent,
7550         .read_setup     = nfs4_proc_read_setup,
7551         .read_pageio_init = pnfs_pageio_init_read,
7552         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7553         .read_done      = nfs4_read_done,
7554         .write_setup    = nfs4_proc_write_setup,
7555         .write_pageio_init = pnfs_pageio_init_write,
7556         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7557         .write_done     = nfs4_write_done,
7558         .commit_setup   = nfs4_proc_commit_setup,
7559         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7560         .commit_done    = nfs4_commit_done,
7561         .lock           = nfs4_proc_lock,
7562         .clear_acl_cache = nfs4_zap_acl_attr,
7563         .close_context  = nfs4_close_context,
7564         .open_context   = nfs4_atomic_open,
7565         .have_delegation = nfs4_have_delegation,
7566         .return_delegation = nfs4_inode_return_delegation,
7567         .alloc_client   = nfs4_alloc_client,
7568         .init_client    = nfs4_init_client,
7569         .free_client    = nfs4_free_client,
7570         .create_server  = nfs4_create_server,
7571         .clone_server   = nfs_clone_server,
7572 };
7573
7574 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7575         .prefix = XATTR_NAME_NFSV4_ACL,
7576         .list   = nfs4_xattr_list_nfs4_acl,
7577         .get    = nfs4_xattr_get_nfs4_acl,
7578         .set    = nfs4_xattr_set_nfs4_acl,
7579 };
7580
7581 const struct xattr_handler *nfs4_xattr_handlers[] = {
7582         &nfs4_xattr_nfs4_acl_handler,
7583 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7584         &nfs4_xattr_nfs4_label_handler,
7585 #endif
7586         NULL
7587 };
7588
7589 /*
7590  * Local variables:
7591  *  c-basic-offset: 8
7592  * End:
7593  */