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                 __be32 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|ATTR_OPEN);
2944
2945         /* Optimization: if the end result is no change, don't RPC */
2946         if ((sattr->ia_valid & ~(ATTR_FILE)) == 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         struct rpc_clnt *client = NFS_CLIENT(dir);
3075         int status;
3076
3077         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3078         if (status < 0)
3079                 return ERR_PTR(status);
3080         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3081 }
3082
3083 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3084 {
3085         struct nfs_server *server = NFS_SERVER(inode);
3086         struct nfs4_accessargs args = {
3087                 .fh = NFS_FH(inode),
3088                 .bitmask = server->cache_consistency_bitmask,
3089         };
3090         struct nfs4_accessres res = {
3091                 .server = server,
3092         };
3093         struct rpc_message msg = {
3094                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3095                 .rpc_argp = &args,
3096                 .rpc_resp = &res,
3097                 .rpc_cred = entry->cred,
3098         };
3099         int mode = entry->mask;
3100         int status = 0;
3101
3102         /*
3103          * Determine which access bits we want to ask for...
3104          */
3105         if (mode & MAY_READ)
3106                 args.access |= NFS4_ACCESS_READ;
3107         if (S_ISDIR(inode->i_mode)) {
3108                 if (mode & MAY_WRITE)
3109                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3110                 if (mode & MAY_EXEC)
3111                         args.access |= NFS4_ACCESS_LOOKUP;
3112         } else {
3113                 if (mode & MAY_WRITE)
3114                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3115                 if (mode & MAY_EXEC)
3116                         args.access |= NFS4_ACCESS_EXECUTE;
3117         }
3118
3119         res.fattr = nfs_alloc_fattr();
3120         if (res.fattr == NULL)
3121                 return -ENOMEM;
3122
3123         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3124         if (!status) {
3125                 nfs_access_set_mask(entry, res.access);
3126                 nfs_refresh_inode(inode, res.fattr);
3127         }
3128         nfs_free_fattr(res.fattr);
3129         return status;
3130 }
3131
3132 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3133 {
3134         struct nfs4_exception exception = { };
3135         int err;
3136         do {
3137                 err = nfs4_handle_exception(NFS_SERVER(inode),
3138                                 _nfs4_proc_access(inode, entry),
3139                                 &exception);
3140         } while (exception.retry);
3141         return err;
3142 }
3143
3144 /*
3145  * TODO: For the time being, we don't try to get any attributes
3146  * along with any of the zero-copy operations READ, READDIR,
3147  * READLINK, WRITE.
3148  *
3149  * In the case of the first three, we want to put the GETATTR
3150  * after the read-type operation -- this is because it is hard
3151  * to predict the length of a GETATTR response in v4, and thus
3152  * align the READ data correctly.  This means that the GETATTR
3153  * may end up partially falling into the page cache, and we should
3154  * shift it into the 'tail' of the xdr_buf before processing.
3155  * To do this efficiently, we need to know the total length
3156  * of data received, which doesn't seem to be available outside
3157  * of the RPC layer.
3158  *
3159  * In the case of WRITE, we also want to put the GETATTR after
3160  * the operation -- in this case because we want to make sure
3161  * we get the post-operation mtime and size.
3162  *
3163  * Both of these changes to the XDR layer would in fact be quite
3164  * minor, but I decided to leave them for a subsequent patch.
3165  */
3166 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3167                 unsigned int pgbase, unsigned int pglen)
3168 {
3169         struct nfs4_readlink args = {
3170                 .fh       = NFS_FH(inode),
3171                 .pgbase   = pgbase,
3172                 .pglen    = pglen,
3173                 .pages    = &page,
3174         };
3175         struct nfs4_readlink_res res;
3176         struct rpc_message msg = {
3177                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3178                 .rpc_argp = &args,
3179                 .rpc_resp = &res,
3180         };
3181
3182         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3183 }
3184
3185 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3186                 unsigned int pgbase, unsigned int pglen)
3187 {
3188         struct nfs4_exception exception = { };
3189         int err;
3190         do {
3191                 err = nfs4_handle_exception(NFS_SERVER(inode),
3192                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
3193                                 &exception);
3194         } while (exception.retry);
3195         return err;
3196 }
3197
3198 /*
3199  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3200  */
3201 static int
3202 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3203                  int flags)
3204 {
3205         struct nfs4_label l, *ilabel = NULL;
3206         struct nfs_open_context *ctx;
3207         struct nfs4_state *state;
3208         int status = 0;
3209
3210         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3211         if (IS_ERR(ctx))
3212                 return PTR_ERR(ctx);
3213
3214         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3215
3216         sattr->ia_mode &= ~current_umask();
3217         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel);
3218         if (IS_ERR(state)) {
3219                 status = PTR_ERR(state);
3220                 goto out;
3221         }
3222 out:
3223         nfs4_label_release_security(ilabel);
3224         put_nfs_open_context(ctx);
3225         return status;
3226 }
3227
3228 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3229 {
3230         struct nfs_server *server = NFS_SERVER(dir);
3231         struct nfs_removeargs args = {
3232                 .fh = NFS_FH(dir),
3233                 .name = *name,
3234         };
3235         struct nfs_removeres res = {
3236                 .server = server,
3237         };
3238         struct rpc_message msg = {
3239                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3240                 .rpc_argp = &args,
3241                 .rpc_resp = &res,
3242         };
3243         int status;
3244
3245         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3246         if (status == 0)
3247                 update_changeattr(dir, &res.cinfo);
3248         return status;
3249 }
3250
3251 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3252 {
3253         struct nfs4_exception exception = { };
3254         int err;
3255         do {
3256                 err = nfs4_handle_exception(NFS_SERVER(dir),
3257                                 _nfs4_proc_remove(dir, name),
3258                                 &exception);
3259         } while (exception.retry);
3260         return err;
3261 }
3262
3263 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3264 {
3265         struct nfs_server *server = NFS_SERVER(dir);
3266         struct nfs_removeargs *args = msg->rpc_argp;
3267         struct nfs_removeres *res = msg->rpc_resp;
3268
3269         res->server = server;
3270         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3271         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3272
3273         nfs_fattr_init(res->dir_attr);
3274 }
3275
3276 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3277 {
3278         nfs4_setup_sequence(NFS_SERVER(data->dir),
3279                         &data->args.seq_args,
3280                         &data->res.seq_res,
3281                         task);
3282 }
3283
3284 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3285 {
3286         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3287
3288         if (!nfs4_sequence_done(task, &res->seq_res))
3289                 return 0;
3290         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3291                 return 0;
3292         update_changeattr(dir, &res->cinfo);
3293         return 1;
3294 }
3295
3296 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3297 {
3298         struct nfs_server *server = NFS_SERVER(dir);
3299         struct nfs_renameargs *arg = msg->rpc_argp;
3300         struct nfs_renameres *res = msg->rpc_resp;
3301
3302         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3303         res->server = server;
3304         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3305 }
3306
3307 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3308 {
3309         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3310                         &data->args.seq_args,
3311                         &data->res.seq_res,
3312                         task);
3313 }
3314
3315 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3316                                  struct inode *new_dir)
3317 {
3318         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3319
3320         if (!nfs4_sequence_done(task, &res->seq_res))
3321                 return 0;
3322         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3323                 return 0;
3324
3325         update_changeattr(old_dir, &res->old_cinfo);
3326         update_changeattr(new_dir, &res->new_cinfo);
3327         return 1;
3328 }
3329
3330 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3331                 struct inode *new_dir, struct qstr *new_name)
3332 {
3333         struct nfs_server *server = NFS_SERVER(old_dir);
3334         struct nfs_renameargs arg = {
3335                 .old_dir = NFS_FH(old_dir),
3336                 .new_dir = NFS_FH(new_dir),
3337                 .old_name = old_name,
3338                 .new_name = new_name,
3339         };
3340         struct nfs_renameres res = {
3341                 .server = server,
3342         };
3343         struct rpc_message msg = {
3344                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3345                 .rpc_argp = &arg,
3346                 .rpc_resp = &res,
3347         };
3348         int status = -ENOMEM;
3349
3350         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3351         if (!status) {
3352                 update_changeattr(old_dir, &res.old_cinfo);
3353                 update_changeattr(new_dir, &res.new_cinfo);
3354         }
3355         return status;
3356 }
3357
3358 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3359                 struct inode *new_dir, struct qstr *new_name)
3360 {
3361         struct nfs4_exception exception = { };
3362         int err;
3363         do {
3364                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3365                                 _nfs4_proc_rename(old_dir, old_name,
3366                                         new_dir, new_name),
3367                                 &exception);
3368         } while (exception.retry);
3369         return err;
3370 }
3371
3372 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3373 {
3374         struct nfs_server *server = NFS_SERVER(inode);
3375         struct nfs4_link_arg arg = {
3376                 .fh     = NFS_FH(inode),
3377                 .dir_fh = NFS_FH(dir),
3378                 .name   = name,
3379                 .bitmask = server->attr_bitmask,
3380         };
3381         struct nfs4_link_res res = {
3382                 .server = server,
3383                 .label = NULL,
3384         };
3385         struct rpc_message msg = {
3386                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3387                 .rpc_argp = &arg,
3388                 .rpc_resp = &res,
3389         };
3390         int status = -ENOMEM;
3391
3392         res.fattr = nfs_alloc_fattr();
3393         if (res.fattr == NULL)
3394                 goto out;
3395
3396         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3397         if (IS_ERR(res.label)) {
3398                 status = PTR_ERR(res.label);
3399                 goto out;
3400         }
3401         arg.bitmask = nfs4_bitmask(server, res.label);
3402
3403         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3404         if (!status) {
3405                 update_changeattr(dir, &res.cinfo);
3406                 status = nfs_post_op_update_inode(inode, res.fattr);
3407                 if (!status)
3408                         nfs_setsecurity(inode, res.fattr, res.label);
3409         }
3410
3411
3412         nfs4_label_free(res.label);
3413
3414 out:
3415         nfs_free_fattr(res.fattr);
3416         return status;
3417 }
3418
3419 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3420 {
3421         struct nfs4_exception exception = { };
3422         int err;
3423         do {
3424                 err = nfs4_handle_exception(NFS_SERVER(inode),
3425                                 _nfs4_proc_link(inode, dir, name),
3426                                 &exception);
3427         } while (exception.retry);
3428         return err;
3429 }
3430
3431 struct nfs4_createdata {
3432         struct rpc_message msg;
3433         struct nfs4_create_arg arg;
3434         struct nfs4_create_res res;
3435         struct nfs_fh fh;
3436         struct nfs_fattr fattr;
3437         struct nfs4_label *label;
3438 };
3439
3440 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3441                 struct qstr *name, struct iattr *sattr, u32 ftype)
3442 {
3443         struct nfs4_createdata *data;
3444
3445         data = kzalloc(sizeof(*data), GFP_KERNEL);
3446         if (data != NULL) {
3447                 struct nfs_server *server = NFS_SERVER(dir);
3448
3449                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3450                 if (IS_ERR(data->label))
3451                         goto out_free;
3452
3453                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3454                 data->msg.rpc_argp = &data->arg;
3455                 data->msg.rpc_resp = &data->res;
3456                 data->arg.dir_fh = NFS_FH(dir);
3457                 data->arg.server = server;
3458                 data->arg.name = name;
3459                 data->arg.attrs = sattr;
3460                 data->arg.ftype = ftype;
3461                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3462                 data->res.server = server;
3463                 data->res.fh = &data->fh;
3464                 data->res.fattr = &data->fattr;
3465                 data->res.label = data->label;
3466                 nfs_fattr_init(data->res.fattr);
3467         }
3468         return data;
3469 out_free:
3470         kfree(data);
3471         return NULL;
3472 }
3473
3474 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3475 {
3476         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3477                                     &data->arg.seq_args, &data->res.seq_res, 1);
3478         if (status == 0) {
3479                 update_changeattr(dir, &data->res.dir_cinfo);
3480                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3481         }
3482         return status;
3483 }
3484
3485 static void nfs4_free_createdata(struct nfs4_createdata *data)
3486 {
3487         nfs4_label_free(data->label);
3488         kfree(data);
3489 }
3490
3491 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3492                 struct page *page, unsigned int len, struct iattr *sattr,
3493                 struct nfs4_label *label)
3494 {
3495         struct nfs4_createdata *data;
3496         int status = -ENAMETOOLONG;
3497
3498         if (len > NFS4_MAXPATHLEN)
3499                 goto out;
3500
3501         status = -ENOMEM;
3502         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3503         if (data == NULL)
3504                 goto out;
3505
3506         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3507         data->arg.u.symlink.pages = &page;
3508         data->arg.u.symlink.len = len;
3509         data->arg.label = label;
3510
3511         status = nfs4_do_create(dir, dentry, data);
3512
3513         nfs4_free_createdata(data);
3514 out:
3515         return status;
3516 }
3517
3518 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3519                 struct page *page, unsigned int len, struct iattr *sattr)
3520 {
3521         struct nfs4_exception exception = { };
3522         struct nfs4_label l, *label = NULL;
3523         int err;
3524
3525         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3526
3527         do {
3528                 err = nfs4_handle_exception(NFS_SERVER(dir),
3529                                 _nfs4_proc_symlink(dir, dentry, page,
3530                                                         len, sattr, label),
3531                                 &exception);
3532         } while (exception.retry);
3533
3534         nfs4_label_release_security(label);
3535         return err;
3536 }
3537
3538 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3539                 struct iattr *sattr, struct nfs4_label *label)
3540 {
3541         struct nfs4_createdata *data;
3542         int status = -ENOMEM;
3543
3544         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3545         if (data == NULL)
3546                 goto out;
3547
3548         data->arg.label = label;
3549         status = nfs4_do_create(dir, dentry, data);
3550
3551         nfs4_free_createdata(data);
3552 out:
3553         return status;
3554 }
3555
3556 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3557                 struct iattr *sattr)
3558 {
3559         struct nfs4_exception exception = { };
3560         struct nfs4_label l, *label = NULL;
3561         int err;
3562
3563         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3564
3565         sattr->ia_mode &= ~current_umask();
3566         do {
3567                 err = nfs4_handle_exception(NFS_SERVER(dir),
3568                                 _nfs4_proc_mkdir(dir, dentry, sattr, label),
3569                                 &exception);
3570         } while (exception.retry);
3571         nfs4_label_release_security(label);
3572
3573         return err;
3574 }
3575
3576 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3577                 u64 cookie, struct page **pages, unsigned int count, int plus)
3578 {
3579         struct inode            *dir = dentry->d_inode;
3580         struct nfs4_readdir_arg args = {
3581                 .fh = NFS_FH(dir),
3582                 .pages = pages,
3583                 .pgbase = 0,
3584                 .count = count,
3585                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3586                 .plus = plus,
3587         };
3588         struct nfs4_readdir_res res;
3589         struct rpc_message msg = {
3590                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3591                 .rpc_argp = &args,
3592                 .rpc_resp = &res,
3593                 .rpc_cred = cred,
3594         };
3595         int                     status;
3596
3597         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3598                         dentry->d_parent->d_name.name,
3599                         dentry->d_name.name,
3600                         (unsigned long long)cookie);
3601         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3602         res.pgbase = args.pgbase;
3603         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3604         if (status >= 0) {
3605                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3606                 status += args.pgbase;
3607         }
3608
3609         nfs_invalidate_atime(dir);
3610
3611         dprintk("%s: returns %d\n", __func__, status);
3612         return status;
3613 }
3614
3615 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3616                 u64 cookie, struct page **pages, unsigned int count, int plus)
3617 {
3618         struct nfs4_exception exception = { };
3619         int err;
3620         do {
3621                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3622                                 _nfs4_proc_readdir(dentry, cred, cookie,
3623                                         pages, count, plus),
3624                                 &exception);
3625         } while (exception.retry);
3626         return err;
3627 }
3628
3629 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3630                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3631 {
3632         struct nfs4_createdata *data;
3633         int mode = sattr->ia_mode;
3634         int status = -ENOMEM;
3635
3636         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3637         if (data == NULL)
3638                 goto out;
3639
3640         if (S_ISFIFO(mode))
3641                 data->arg.ftype = NF4FIFO;
3642         else if (S_ISBLK(mode)) {
3643                 data->arg.ftype = NF4BLK;
3644                 data->arg.u.device.specdata1 = MAJOR(rdev);
3645                 data->arg.u.device.specdata2 = MINOR(rdev);
3646         }
3647         else if (S_ISCHR(mode)) {
3648                 data->arg.ftype = NF4CHR;
3649                 data->arg.u.device.specdata1 = MAJOR(rdev);
3650                 data->arg.u.device.specdata2 = MINOR(rdev);
3651         } else if (!S_ISSOCK(mode)) {
3652                 status = -EINVAL;
3653                 goto out_free;
3654         }
3655
3656         data->arg.label = label;
3657         status = nfs4_do_create(dir, dentry, data);
3658 out_free:
3659         nfs4_free_createdata(data);
3660 out:
3661         return status;
3662 }
3663
3664 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3665                 struct iattr *sattr, dev_t rdev)
3666 {
3667         struct nfs4_exception exception = { };
3668         struct nfs4_label l, *label = NULL;
3669         int err;
3670
3671         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3672
3673         sattr->ia_mode &= ~current_umask();
3674         do {
3675                 err = nfs4_handle_exception(NFS_SERVER(dir),
3676                                 _nfs4_proc_mknod(dir, dentry, sattr, label, rdev),
3677                                 &exception);
3678         } while (exception.retry);
3679
3680         nfs4_label_release_security(label);
3681
3682         return err;
3683 }
3684
3685 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3686                  struct nfs_fsstat *fsstat)
3687 {
3688         struct nfs4_statfs_arg args = {
3689                 .fh = fhandle,
3690                 .bitmask = server->attr_bitmask,
3691         };
3692         struct nfs4_statfs_res res = {
3693                 .fsstat = fsstat,
3694         };
3695         struct rpc_message msg = {
3696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3697                 .rpc_argp = &args,
3698                 .rpc_resp = &res,
3699         };
3700
3701         nfs_fattr_init(fsstat->fattr);
3702         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3703 }
3704
3705 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3706 {
3707         struct nfs4_exception exception = { };
3708         int err;
3709         do {
3710                 err = nfs4_handle_exception(server,
3711                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3712                                 &exception);
3713         } while (exception.retry);
3714         return err;
3715 }
3716
3717 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3718                 struct nfs_fsinfo *fsinfo)
3719 {
3720         struct nfs4_fsinfo_arg args = {
3721                 .fh = fhandle,
3722                 .bitmask = server->attr_bitmask,
3723         };
3724         struct nfs4_fsinfo_res res = {
3725                 .fsinfo = fsinfo,
3726         };
3727         struct rpc_message msg = {
3728                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3729                 .rpc_argp = &args,
3730                 .rpc_resp = &res,
3731         };
3732
3733         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3734 }
3735
3736 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3737 {
3738         struct nfs4_exception exception = { };
3739         unsigned long now = jiffies;
3740         int err;
3741
3742         do {
3743                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3744                 if (err == 0) {
3745                         struct nfs_client *clp = server->nfs_client;
3746
3747                         spin_lock(&clp->cl_lock);
3748                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3749                         clp->cl_last_renewal = now;
3750                         spin_unlock(&clp->cl_lock);
3751                         break;
3752                 }
3753                 err = nfs4_handle_exception(server, err, &exception);
3754         } while (exception.retry);
3755         return err;
3756 }
3757
3758 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3759 {
3760         int error;
3761
3762         nfs_fattr_init(fsinfo->fattr);
3763         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3764         if (error == 0) {
3765                 /* block layout checks this! */
3766                 server->pnfs_blksize = fsinfo->blksize;
3767                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3768         }
3769
3770         return error;
3771 }
3772
3773 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3774                 struct nfs_pathconf *pathconf)
3775 {
3776         struct nfs4_pathconf_arg args = {
3777                 .fh = fhandle,
3778                 .bitmask = server->attr_bitmask,
3779         };
3780         struct nfs4_pathconf_res res = {
3781                 .pathconf = pathconf,
3782         };
3783         struct rpc_message msg = {
3784                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3785                 .rpc_argp = &args,
3786                 .rpc_resp = &res,
3787         };
3788
3789         /* None of the pathconf attributes are mandatory to implement */
3790         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3791                 memset(pathconf, 0, sizeof(*pathconf));
3792                 return 0;
3793         }
3794
3795         nfs_fattr_init(pathconf->fattr);
3796         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3797 }
3798
3799 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3800                 struct nfs_pathconf *pathconf)
3801 {
3802         struct nfs4_exception exception = { };
3803         int err;
3804
3805         do {
3806                 err = nfs4_handle_exception(server,
3807                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3808                                 &exception);
3809         } while (exception.retry);
3810         return err;
3811 }
3812
3813 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3814                 const struct nfs_open_context *ctx,
3815                 const struct nfs_lock_context *l_ctx,
3816                 fmode_t fmode)
3817 {
3818         const struct nfs_lockowner *lockowner = NULL;
3819
3820         if (l_ctx != NULL)
3821                 lockowner = &l_ctx->lockowner;
3822         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3823 }
3824 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3825
3826 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3827                 const struct nfs_open_context *ctx,
3828                 const struct nfs_lock_context *l_ctx,
3829                 fmode_t fmode)
3830 {
3831         nfs4_stateid current_stateid;
3832
3833         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3834                 return false;
3835         return nfs4_stateid_match(stateid, &current_stateid);
3836 }
3837
3838 static bool nfs4_error_stateid_expired(int err)
3839 {
3840         switch (err) {
3841         case -NFS4ERR_DELEG_REVOKED:
3842         case -NFS4ERR_ADMIN_REVOKED:
3843         case -NFS4ERR_BAD_STATEID:
3844         case -NFS4ERR_STALE_STATEID:
3845         case -NFS4ERR_OLD_STATEID:
3846         case -NFS4ERR_OPENMODE:
3847         case -NFS4ERR_EXPIRED:
3848                 return true;
3849         }
3850         return false;
3851 }
3852
3853 void __nfs4_read_done_cb(struct nfs_read_data *data)
3854 {
3855         nfs_invalidate_atime(data->header->inode);
3856 }
3857
3858 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3859 {
3860         struct nfs_server *server = NFS_SERVER(data->header->inode);
3861
3862         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3863                 rpc_restart_call_prepare(task);
3864                 return -EAGAIN;
3865         }
3866
3867         __nfs4_read_done_cb(data);
3868         if (task->tk_status > 0)
3869                 renew_lease(server, data->timestamp);
3870         return 0;
3871 }
3872
3873 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3874                 struct nfs_readargs *args)
3875 {
3876
3877         if (!nfs4_error_stateid_expired(task->tk_status) ||
3878                 nfs4_stateid_is_current(&args->stateid,
3879                                 args->context,
3880                                 args->lock_context,
3881                                 FMODE_READ))
3882                 return false;
3883         rpc_restart_call_prepare(task);
3884         return true;
3885 }
3886
3887 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3888 {
3889
3890         dprintk("--> %s\n", __func__);
3891
3892         if (!nfs4_sequence_done(task, &data->res.seq_res))
3893                 return -EAGAIN;
3894         if (nfs4_read_stateid_changed(task, &data->args))
3895                 return -EAGAIN;
3896         return data->read_done_cb ? data->read_done_cb(task, data) :
3897                                     nfs4_read_done_cb(task, data);
3898 }
3899
3900 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3901 {
3902         data->timestamp   = jiffies;
3903         data->read_done_cb = nfs4_read_done_cb;
3904         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3905         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3906 }
3907
3908 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3909 {
3910         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3911                         &data->args.seq_args,
3912                         &data->res.seq_res,
3913                         task))
3914                 return;
3915         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3916                         data->args.lock_context, FMODE_READ);
3917 }
3918
3919 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3920 {
3921         struct inode *inode = data->header->inode;
3922
3923         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3924                 rpc_restart_call_prepare(task);
3925                 return -EAGAIN;
3926         }
3927         if (task->tk_status >= 0) {
3928                 renew_lease(NFS_SERVER(inode), data->timestamp);
3929                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3930         }
3931         return 0;
3932 }
3933
3934 static bool nfs4_write_stateid_changed(struct rpc_task *task,
3935                 struct nfs_writeargs *args)
3936 {
3937
3938         if (!nfs4_error_stateid_expired(task->tk_status) ||
3939                 nfs4_stateid_is_current(&args->stateid,
3940                                 args->context,
3941                                 args->lock_context,
3942                                 FMODE_WRITE))
3943                 return false;
3944         rpc_restart_call_prepare(task);
3945         return true;
3946 }
3947
3948 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3949 {
3950         if (!nfs4_sequence_done(task, &data->res.seq_res))
3951                 return -EAGAIN;
3952         if (nfs4_write_stateid_changed(task, &data->args))
3953                 return -EAGAIN;
3954         return data->write_done_cb ? data->write_done_cb(task, data) :
3955                 nfs4_write_done_cb(task, data);
3956 }
3957
3958 static
3959 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3960 {
3961         const struct nfs_pgio_header *hdr = data->header;
3962
3963         /* Don't request attributes for pNFS or O_DIRECT writes */
3964         if (data->ds_clp != NULL || hdr->dreq != NULL)
3965                 return false;
3966         /* Otherwise, request attributes if and only if we don't hold
3967          * a delegation
3968          */
3969         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3970 }
3971
3972 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3973 {
3974         struct nfs_server *server = NFS_SERVER(data->header->inode);
3975
3976         if (!nfs4_write_need_cache_consistency_data(data)) {
3977                 data->args.bitmask = NULL;
3978                 data->res.fattr = NULL;
3979         } else
3980                 data->args.bitmask = server->cache_consistency_bitmask;
3981
3982         if (!data->write_done_cb)
3983                 data->write_done_cb = nfs4_write_done_cb;
3984         data->res.server = server;
3985         data->timestamp   = jiffies;
3986
3987         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3988         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3989 }
3990
3991 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3992 {
3993         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3994                         &data->args.seq_args,
3995                         &data->res.seq_res,
3996                         task))
3997                 return;
3998         nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
3999                         data->args.lock_context, FMODE_WRITE);
4000 }
4001
4002 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4003 {
4004         nfs4_setup_sequence(NFS_SERVER(data->inode),
4005                         &data->args.seq_args,
4006                         &data->res.seq_res,
4007                         task);
4008 }
4009
4010 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4011 {
4012         struct inode *inode = data->inode;
4013
4014         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4015                 rpc_restart_call_prepare(task);
4016                 return -EAGAIN;
4017         }
4018         return 0;
4019 }
4020
4021 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4022 {
4023         if (!nfs4_sequence_done(task, &data->res.seq_res))
4024                 return -EAGAIN;
4025         return data->commit_done_cb(task, data);
4026 }
4027
4028 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4029 {
4030         struct nfs_server *server = NFS_SERVER(data->inode);
4031
4032         if (data->commit_done_cb == NULL)
4033                 data->commit_done_cb = nfs4_commit_done_cb;
4034         data->res.server = server;
4035         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4036         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4037 }
4038
4039 struct nfs4_renewdata {
4040         struct nfs_client       *client;
4041         unsigned long           timestamp;
4042 };
4043
4044 /*
4045  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4046  * standalone procedure for queueing an asynchronous RENEW.
4047  */
4048 static void nfs4_renew_release(void *calldata)
4049 {
4050         struct nfs4_renewdata *data = calldata;
4051         struct nfs_client *clp = data->client;
4052
4053         if (atomic_read(&clp->cl_count) > 1)
4054                 nfs4_schedule_state_renewal(clp);
4055         nfs_put_client(clp);
4056         kfree(data);
4057 }
4058
4059 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4060 {
4061         struct nfs4_renewdata *data = calldata;
4062         struct nfs_client *clp = data->client;
4063         unsigned long timestamp = data->timestamp;
4064
4065         if (task->tk_status < 0) {
4066                 /* Unless we're shutting down, schedule state recovery! */
4067                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4068                         return;
4069                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4070                         nfs4_schedule_lease_recovery(clp);
4071                         return;
4072                 }
4073                 nfs4_schedule_path_down_recovery(clp);
4074         }
4075         do_renew_lease(clp, timestamp);
4076 }
4077
4078 static const struct rpc_call_ops nfs4_renew_ops = {
4079         .rpc_call_done = nfs4_renew_done,
4080         .rpc_release = nfs4_renew_release,
4081 };
4082
4083 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4084 {
4085         struct rpc_message msg = {
4086                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4087                 .rpc_argp       = clp,
4088                 .rpc_cred       = cred,
4089         };
4090         struct nfs4_renewdata *data;
4091
4092         if (renew_flags == 0)
4093                 return 0;
4094         if (!atomic_inc_not_zero(&clp->cl_count))
4095                 return -EIO;
4096         data = kmalloc(sizeof(*data), GFP_NOFS);
4097         if (data == NULL)
4098                 return -ENOMEM;
4099         data->client = clp;
4100         data->timestamp = jiffies;
4101         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4102                         &nfs4_renew_ops, data);
4103 }
4104
4105 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4106 {
4107         struct rpc_message msg = {
4108                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4109                 .rpc_argp       = clp,
4110                 .rpc_cred       = cred,
4111         };
4112         unsigned long now = jiffies;
4113         int status;
4114
4115         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4116         if (status < 0)
4117                 return status;
4118         do_renew_lease(clp, now);
4119         return 0;
4120 }
4121
4122 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4123 {
4124         return (server->caps & NFS_CAP_ACLS)
4125                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4126                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4127 }
4128
4129 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4130  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4131  * the stack.
4132  */
4133 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4134
4135 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4136                 struct page **pages, unsigned int *pgbase)
4137 {
4138         struct page *newpage, **spages;
4139         int rc = 0;
4140         size_t len;
4141         spages = pages;
4142
4143         do {
4144                 len = min_t(size_t, PAGE_SIZE, buflen);
4145                 newpage = alloc_page(GFP_KERNEL);
4146
4147                 if (newpage == NULL)
4148                         goto unwind;
4149                 memcpy(page_address(newpage), buf, len);
4150                 buf += len;
4151                 buflen -= len;
4152                 *pages++ = newpage;
4153                 rc++;
4154         } while (buflen != 0);
4155
4156         return rc;
4157
4158 unwind:
4159         for(; rc > 0; rc--)
4160                 __free_page(spages[rc-1]);
4161         return -ENOMEM;
4162 }
4163
4164 struct nfs4_cached_acl {
4165         int cached;
4166         size_t len;
4167         char data[0];
4168 };
4169
4170 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4171 {
4172         struct nfs_inode *nfsi = NFS_I(inode);
4173
4174         spin_lock(&inode->i_lock);
4175         kfree(nfsi->nfs4_acl);
4176         nfsi->nfs4_acl = acl;
4177         spin_unlock(&inode->i_lock);
4178 }
4179
4180 static void nfs4_zap_acl_attr(struct inode *inode)
4181 {
4182         nfs4_set_cached_acl(inode, NULL);
4183 }
4184
4185 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4186 {
4187         struct nfs_inode *nfsi = NFS_I(inode);
4188         struct nfs4_cached_acl *acl;
4189         int ret = -ENOENT;
4190
4191         spin_lock(&inode->i_lock);
4192         acl = nfsi->nfs4_acl;
4193         if (acl == NULL)
4194                 goto out;
4195         if (buf == NULL) /* user is just asking for length */
4196                 goto out_len;
4197         if (acl->cached == 0)
4198                 goto out;
4199         ret = -ERANGE; /* see getxattr(2) man page */
4200         if (acl->len > buflen)
4201                 goto out;
4202         memcpy(buf, acl->data, acl->len);
4203 out_len:
4204         ret = acl->len;
4205 out:
4206         spin_unlock(&inode->i_lock);
4207         return ret;
4208 }
4209
4210 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4211 {
4212         struct nfs4_cached_acl *acl;
4213         size_t buflen = sizeof(*acl) + acl_len;
4214
4215         if (buflen <= PAGE_SIZE) {
4216                 acl = kmalloc(buflen, GFP_KERNEL);
4217                 if (acl == NULL)
4218                         goto out;
4219                 acl->cached = 1;
4220                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4221         } else {
4222                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4223                 if (acl == NULL)
4224                         goto out;
4225                 acl->cached = 0;
4226         }
4227         acl->len = acl_len;
4228 out:
4229         nfs4_set_cached_acl(inode, acl);
4230 }
4231
4232 /*
4233  * The getxattr API returns the required buffer length when called with a
4234  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4235  * the required buf.  On a NULL buf, we send a page of data to the server
4236  * guessing that the ACL request can be serviced by a page. If so, we cache
4237  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4238  * the cache. If not so, we throw away the page, and cache the required
4239  * length. The next getxattr call will then produce another round trip to
4240  * the server, this time with the input buf of the required size.
4241  */
4242 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4243 {
4244         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4245         struct nfs_getaclargs args = {
4246                 .fh = NFS_FH(inode),
4247                 .acl_pages = pages,
4248                 .acl_len = buflen,
4249         };
4250         struct nfs_getaclres res = {
4251                 .acl_len = buflen,
4252         };
4253         struct rpc_message msg = {
4254                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4255                 .rpc_argp = &args,
4256                 .rpc_resp = &res,
4257         };
4258         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4259         int ret = -ENOMEM, i;
4260
4261         /* As long as we're doing a round trip to the server anyway,
4262          * let's be prepared for a page of acl data. */
4263         if (npages == 0)
4264                 npages = 1;
4265         if (npages > ARRAY_SIZE(pages))
4266                 return -ERANGE;
4267
4268         for (i = 0; i < npages; i++) {
4269                 pages[i] = alloc_page(GFP_KERNEL);
4270                 if (!pages[i])
4271                         goto out_free;
4272         }
4273
4274         /* for decoding across pages */
4275         res.acl_scratch = alloc_page(GFP_KERNEL);
4276         if (!res.acl_scratch)
4277                 goto out_free;
4278
4279         args.acl_len = npages * PAGE_SIZE;
4280         args.acl_pgbase = 0;
4281
4282         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4283                 __func__, buf, buflen, npages, args.acl_len);
4284         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4285                              &msg, &args.seq_args, &res.seq_res, 0);
4286         if (ret)
4287                 goto out_free;
4288
4289         /* Handle the case where the passed-in buffer is too short */
4290         if (res.acl_flags & NFS4_ACL_TRUNC) {
4291                 /* Did the user only issue a request for the acl length? */
4292                 if (buf == NULL)
4293                         goto out_ok;
4294                 ret = -ERANGE;
4295                 goto out_free;
4296         }
4297         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4298         if (buf) {
4299                 if (res.acl_len > buflen) {
4300                         ret = -ERANGE;
4301                         goto out_free;
4302                 }
4303                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4304         }
4305 out_ok:
4306         ret = res.acl_len;
4307 out_free:
4308         for (i = 0; i < npages; i++)
4309                 if (pages[i])
4310                         __free_page(pages[i]);
4311         if (res.acl_scratch)
4312                 __free_page(res.acl_scratch);
4313         return ret;
4314 }
4315
4316 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4317 {
4318         struct nfs4_exception exception = { };
4319         ssize_t ret;
4320         do {
4321                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4322                 if (ret >= 0)
4323                         break;
4324                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4325         } while (exception.retry);
4326         return ret;
4327 }
4328
4329 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4330 {
4331         struct nfs_server *server = NFS_SERVER(inode);
4332         int ret;
4333
4334         if (!nfs4_server_supports_acls(server))
4335                 return -EOPNOTSUPP;
4336         ret = nfs_revalidate_inode(server, inode);
4337         if (ret < 0)
4338                 return ret;
4339         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4340                 nfs_zap_acl_cache(inode);
4341         ret = nfs4_read_cached_acl(inode, buf, buflen);
4342         if (ret != -ENOENT)
4343                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4344                  * but no cached acl data, just the acl length */
4345                 return ret;
4346         return nfs4_get_acl_uncached(inode, buf, buflen);
4347 }
4348
4349 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4350 {
4351         struct nfs_server *server = NFS_SERVER(inode);
4352         struct page *pages[NFS4ACL_MAXPAGES];
4353         struct nfs_setaclargs arg = {
4354                 .fh             = NFS_FH(inode),
4355                 .acl_pages      = pages,
4356                 .acl_len        = buflen,
4357         };
4358         struct nfs_setaclres res;
4359         struct rpc_message msg = {
4360                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4361                 .rpc_argp       = &arg,
4362                 .rpc_resp       = &res,
4363         };
4364         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4365         int ret, i;
4366
4367         if (!nfs4_server_supports_acls(server))
4368                 return -EOPNOTSUPP;
4369         if (npages > ARRAY_SIZE(pages))
4370                 return -ERANGE;
4371         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4372         if (i < 0)
4373                 return i;
4374         nfs4_inode_return_delegation(inode);
4375         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4376
4377         /*
4378          * Free each page after tx, so the only ref left is
4379          * held by the network stack
4380          */
4381         for (; i > 0; i--)
4382                 put_page(pages[i-1]);
4383
4384         /*
4385          * Acl update can result in inode attribute update.
4386          * so mark the attribute cache invalid.
4387          */
4388         spin_lock(&inode->i_lock);
4389         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4390         spin_unlock(&inode->i_lock);
4391         nfs_access_zap_cache(inode);
4392         nfs_zap_acl_cache(inode);
4393         return ret;
4394 }
4395
4396 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4397 {
4398         struct nfs4_exception exception = { };
4399         int err;
4400         do {
4401                 err = nfs4_handle_exception(NFS_SERVER(inode),
4402                                 __nfs4_proc_set_acl(inode, buf, buflen),
4403                                 &exception);
4404         } while (exception.retry);
4405         return err;
4406 }
4407
4408 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4409 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4410                                         size_t buflen)
4411 {
4412         struct nfs_server *server = NFS_SERVER(inode);
4413         struct nfs_fattr fattr;
4414         struct nfs4_label label = {0, 0, buflen, buf};
4415
4416         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4417         struct nfs4_getattr_arg args = {
4418                 .fh             = NFS_FH(inode),
4419                 .bitmask        = bitmask,
4420         };
4421         struct nfs4_getattr_res res = {
4422                 .fattr          = &fattr,
4423                 .label          = &label,
4424                 .server         = server,
4425         };
4426         struct rpc_message msg = {
4427                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4428                 .rpc_argp       = &args,
4429                 .rpc_resp       = &res,
4430         };
4431         int ret;
4432
4433         nfs_fattr_init(&fattr);
4434
4435         ret = rpc_call_sync(server->client, &msg, 0);
4436         if (ret)
4437                 return ret;
4438         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4439                 return -ENOENT;
4440         if (buflen < label.len)
4441                 return -ERANGE;
4442         return 0;
4443 }
4444
4445 static int nfs4_get_security_label(struct inode *inode, void *buf,
4446                                         size_t buflen)
4447 {
4448         struct nfs4_exception exception = { };
4449         int err;
4450
4451         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4452                 return -EOPNOTSUPP;
4453
4454         do {
4455                 err = nfs4_handle_exception(NFS_SERVER(inode),
4456                                 _nfs4_get_security_label(inode, buf, buflen),
4457                                 &exception);
4458         } while (exception.retry);
4459         return err;
4460 }
4461
4462 static int _nfs4_do_set_security_label(struct inode *inode,
4463                 struct nfs4_label *ilabel,
4464                 struct nfs_fattr *fattr,
4465                 struct nfs4_label *olabel)
4466 {
4467
4468         struct iattr sattr = {0};
4469         struct nfs_server *server = NFS_SERVER(inode);
4470         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4471         struct nfs_setattrargs args = {
4472                 .fh             = NFS_FH(inode),
4473                 .iap            = &sattr,
4474                 .server         = server,
4475                 .bitmask        = bitmask,
4476                 .label          = ilabel,
4477         };
4478         struct nfs_setattrres res = {
4479                 .fattr          = fattr,
4480                 .label          = olabel,
4481                 .server         = server,
4482         };
4483         struct rpc_message msg = {
4484                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4485                 .rpc_argp       = &args,
4486                 .rpc_resp       = &res,
4487         };
4488         int status;
4489
4490         nfs4_stateid_copy(&args.stateid, &zero_stateid);
4491
4492         status = rpc_call_sync(server->client, &msg, 0);
4493         if (status)
4494                 dprintk("%s failed: %d\n", __func__, status);
4495
4496         return status;
4497 }
4498
4499 static int nfs4_do_set_security_label(struct inode *inode,
4500                 struct nfs4_label *ilabel,
4501                 struct nfs_fattr *fattr,
4502                 struct nfs4_label *olabel)
4503 {
4504         struct nfs4_exception exception = { };
4505         int err;
4506
4507         do {
4508                 err = nfs4_handle_exception(NFS_SERVER(inode),
4509                                 _nfs4_do_set_security_label(inode, ilabel,
4510                                 fattr, olabel),
4511                                 &exception);
4512         } while (exception.retry);
4513         return err;
4514 }
4515
4516 static int
4517 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4518 {
4519         struct nfs4_label ilabel, *olabel = NULL;
4520         struct nfs_fattr fattr;
4521         struct rpc_cred *cred;
4522         struct inode *inode = dentry->d_inode;
4523         int status;
4524
4525         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4526                 return -EOPNOTSUPP;
4527
4528         nfs_fattr_init(&fattr);
4529
4530         ilabel.pi = 0;
4531         ilabel.lfs = 0;
4532         ilabel.label = (char *)buf;
4533         ilabel.len = buflen;
4534
4535         cred = rpc_lookup_cred();
4536         if (IS_ERR(cred))
4537                 return PTR_ERR(cred);
4538
4539         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4540         if (IS_ERR(olabel)) {
4541                 status = -PTR_ERR(olabel);
4542                 goto out;
4543         }
4544
4545         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4546         if (status == 0)
4547                 nfs_setsecurity(inode, &fattr, olabel);
4548
4549         nfs4_label_free(olabel);
4550 out:
4551         put_rpccred(cred);
4552         return status;
4553 }
4554 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4555
4556
4557 static int
4558 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4559 {
4560         struct nfs_client *clp = server->nfs_client;
4561
4562         if (task->tk_status >= 0)
4563                 return 0;
4564         switch(task->tk_status) {
4565                 case -NFS4ERR_DELEG_REVOKED:
4566                 case -NFS4ERR_ADMIN_REVOKED:
4567                 case -NFS4ERR_BAD_STATEID:
4568                         if (state == NULL)
4569                                 break;
4570                         nfs_remove_bad_delegation(state->inode);
4571                 case -NFS4ERR_OPENMODE:
4572                         if (state == NULL)
4573                                 break;
4574                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4575                                 goto stateid_invalid;
4576                         goto wait_on_recovery;
4577                 case -NFS4ERR_EXPIRED:
4578                         if (state != NULL) {
4579                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4580                                         goto stateid_invalid;
4581                         }
4582                 case -NFS4ERR_STALE_STATEID:
4583                 case -NFS4ERR_STALE_CLIENTID:
4584                         nfs4_schedule_lease_recovery(clp);
4585                         goto wait_on_recovery;
4586 #if defined(CONFIG_NFS_V4_1)
4587                 case -NFS4ERR_BADSESSION:
4588                 case -NFS4ERR_BADSLOT:
4589                 case -NFS4ERR_BAD_HIGH_SLOT:
4590                 case -NFS4ERR_DEADSESSION:
4591                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4592                 case -NFS4ERR_SEQ_FALSE_RETRY:
4593                 case -NFS4ERR_SEQ_MISORDERED:
4594                         dprintk("%s ERROR %d, Reset session\n", __func__,
4595                                 task->tk_status);
4596                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4597                         task->tk_status = 0;
4598                         return -EAGAIN;
4599 #endif /* CONFIG_NFS_V4_1 */
4600                 case -NFS4ERR_DELAY:
4601                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4602                 case -NFS4ERR_GRACE:
4603                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4604                         task->tk_status = 0;
4605                         return -EAGAIN;
4606                 case -NFS4ERR_RETRY_UNCACHED_REP:
4607                 case -NFS4ERR_OLD_STATEID:
4608                         task->tk_status = 0;
4609                         return -EAGAIN;
4610         }
4611         task->tk_status = nfs4_map_errors(task->tk_status);
4612         return 0;
4613 stateid_invalid:
4614         task->tk_status = -EIO;
4615         return 0;
4616 wait_on_recovery:
4617         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4618         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4619                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4620         task->tk_status = 0;
4621         return -EAGAIN;
4622 }
4623
4624 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4625                                     nfs4_verifier *bootverf)
4626 {
4627         __be32 verf[2];
4628
4629         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4630                 /* An impossible timestamp guarantees this value
4631                  * will never match a generated boot time. */
4632                 verf[0] = 0;
4633                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4634         } else {
4635                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4636                 verf[0] = (__be32)nn->boot_time.tv_sec;
4637                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4638         }
4639         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4640 }
4641
4642 static unsigned int
4643 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4644                                    char *buf, size_t len)
4645 {
4646         unsigned int result;
4647
4648         rcu_read_lock();
4649         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4650                                 clp->cl_ipaddr,
4651                                 rpc_peeraddr2str(clp->cl_rpcclient,
4652                                                         RPC_DISPLAY_ADDR),
4653                                 rpc_peeraddr2str(clp->cl_rpcclient,
4654                                                         RPC_DISPLAY_PROTO));
4655         rcu_read_unlock();
4656         return result;
4657 }
4658
4659 static unsigned int
4660 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4661                                 char *buf, size_t len)
4662 {
4663         char *nodename = clp->cl_rpcclient->cl_nodename;
4664
4665         if (nfs4_client_id_uniquifier[0] != '\0')
4666                 nodename = nfs4_client_id_uniquifier;
4667         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4668                                 clp->rpc_ops->version, clp->cl_minorversion,
4669                                 nodename);
4670 }
4671
4672 /**
4673  * nfs4_proc_setclientid - Negotiate client ID
4674  * @clp: state data structure
4675  * @program: RPC program for NFSv4 callback service
4676  * @port: IP port number for NFS4 callback service
4677  * @cred: RPC credential to use for this call
4678  * @res: where to place the result
4679  *
4680  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4681  */
4682 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4683                 unsigned short port, struct rpc_cred *cred,
4684                 struct nfs4_setclientid_res *res)
4685 {
4686         nfs4_verifier sc_verifier;
4687         struct nfs4_setclientid setclientid = {
4688                 .sc_verifier = &sc_verifier,
4689                 .sc_prog = program,
4690                 .sc_cb_ident = clp->cl_cb_ident,
4691         };
4692         struct rpc_message msg = {
4693                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4694                 .rpc_argp = &setclientid,
4695                 .rpc_resp = res,
4696                 .rpc_cred = cred,
4697         };
4698         int status;
4699
4700         /* nfs_client_id4 */
4701         nfs4_init_boot_verifier(clp, &sc_verifier);
4702         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4703                 setclientid.sc_name_len =
4704                                 nfs4_init_uniform_client_string(clp,
4705                                                 setclientid.sc_name,
4706                                                 sizeof(setclientid.sc_name));
4707         else
4708                 setclientid.sc_name_len =
4709                                 nfs4_init_nonuniform_client_string(clp,
4710                                                 setclientid.sc_name,
4711                                                 sizeof(setclientid.sc_name));
4712         /* cb_client4 */
4713         rcu_read_lock();
4714         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4715                                 sizeof(setclientid.sc_netid), "%s",
4716                                 rpc_peeraddr2str(clp->cl_rpcclient,
4717                                                         RPC_DISPLAY_NETID));
4718         rcu_read_unlock();
4719         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4720                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4721                                 clp->cl_ipaddr, port >> 8, port & 255);
4722
4723         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4724                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4725                 setclientid.sc_name_len, setclientid.sc_name);
4726         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4727         dprintk("NFS reply setclientid: %d\n", status);
4728         return status;
4729 }
4730
4731 /**
4732  * nfs4_proc_setclientid_confirm - Confirm client ID
4733  * @clp: state data structure
4734  * @res: result of a previous SETCLIENTID
4735  * @cred: RPC credential to use for this call
4736  *
4737  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4738  */
4739 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4740                 struct nfs4_setclientid_res *arg,
4741                 struct rpc_cred *cred)
4742 {
4743         struct rpc_message msg = {
4744                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4745                 .rpc_argp = arg,
4746                 .rpc_cred = cred,
4747         };
4748         int status;
4749
4750         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4751                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4752                 clp->cl_clientid);
4753         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4754         dprintk("NFS reply setclientid_confirm: %d\n", status);
4755         return status;
4756 }
4757
4758 struct nfs4_delegreturndata {
4759         struct nfs4_delegreturnargs args;
4760         struct nfs4_delegreturnres res;
4761         struct nfs_fh fh;
4762         nfs4_stateid stateid;
4763         unsigned long timestamp;
4764         struct nfs_fattr fattr;
4765         int rpc_status;
4766 };
4767
4768 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4769 {
4770         struct nfs4_delegreturndata *data = calldata;
4771
4772         if (!nfs4_sequence_done(task, &data->res.seq_res))
4773                 return;
4774
4775         switch (task->tk_status) {
4776         case -NFS4ERR_STALE_STATEID:
4777         case -NFS4ERR_EXPIRED:
4778         case 0:
4779                 renew_lease(data->res.server, data->timestamp);
4780                 break;
4781         default:
4782                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4783                                 -EAGAIN) {
4784                         rpc_restart_call_prepare(task);
4785                         return;
4786                 }
4787         }
4788         data->rpc_status = task->tk_status;
4789 }
4790
4791 static void nfs4_delegreturn_release(void *calldata)
4792 {
4793         kfree(calldata);
4794 }
4795
4796 #if defined(CONFIG_NFS_V4_1)
4797 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4798 {
4799         struct nfs4_delegreturndata *d_data;
4800
4801         d_data = (struct nfs4_delegreturndata *)data;
4802
4803         nfs4_setup_sequence(d_data->res.server,
4804                         &d_data->args.seq_args,
4805                         &d_data->res.seq_res,
4806                         task);
4807 }
4808 #endif /* CONFIG_NFS_V4_1 */
4809
4810 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4811 #if defined(CONFIG_NFS_V4_1)
4812         .rpc_call_prepare = nfs4_delegreturn_prepare,
4813 #endif /* CONFIG_NFS_V4_1 */
4814         .rpc_call_done = nfs4_delegreturn_done,
4815         .rpc_release = nfs4_delegreturn_release,
4816 };
4817
4818 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4819 {
4820         struct nfs4_delegreturndata *data;
4821         struct nfs_server *server = NFS_SERVER(inode);
4822         struct rpc_task *task;
4823         struct rpc_message msg = {
4824                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4825                 .rpc_cred = cred,
4826         };
4827         struct rpc_task_setup task_setup_data = {
4828                 .rpc_client = server->client,
4829                 .rpc_message = &msg,
4830                 .callback_ops = &nfs4_delegreturn_ops,
4831                 .flags = RPC_TASK_ASYNC,
4832         };
4833         int status = 0;
4834
4835         data = kzalloc(sizeof(*data), GFP_NOFS);
4836         if (data == NULL)
4837                 return -ENOMEM;
4838         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4839         data->args.fhandle = &data->fh;
4840         data->args.stateid = &data->stateid;
4841         data->args.bitmask = server->cache_consistency_bitmask;
4842         nfs_copy_fh(&data->fh, NFS_FH(inode));
4843         nfs4_stateid_copy(&data->stateid, stateid);
4844         data->res.fattr = &data->fattr;
4845         data->res.server = server;
4846         nfs_fattr_init(data->res.fattr);
4847         data->timestamp = jiffies;
4848         data->rpc_status = 0;
4849
4850         task_setup_data.callback_data = data;
4851         msg.rpc_argp = &data->args;
4852         msg.rpc_resp = &data->res;
4853         task = rpc_run_task(&task_setup_data);
4854         if (IS_ERR(task))
4855                 return PTR_ERR(task);
4856         if (!issync)
4857                 goto out;
4858         status = nfs4_wait_for_completion_rpc_task(task);
4859         if (status != 0)
4860                 goto out;
4861         status = data->rpc_status;
4862         if (status == 0)
4863                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4864         else
4865                 nfs_refresh_inode(inode, &data->fattr);
4866 out:
4867         rpc_put_task(task);
4868         return status;
4869 }
4870
4871 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4872 {
4873         struct nfs_server *server = NFS_SERVER(inode);
4874         struct nfs4_exception exception = { };
4875         int err;
4876         do {
4877                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4878                 switch (err) {
4879                         case -NFS4ERR_STALE_STATEID:
4880                         case -NFS4ERR_EXPIRED:
4881                         case 0:
4882                                 return 0;
4883                 }
4884                 err = nfs4_handle_exception(server, err, &exception);
4885         } while (exception.retry);
4886         return err;
4887 }
4888
4889 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4890 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4891
4892 /*
4893  * sleep, with exponential backoff, and retry the LOCK operation.
4894  */
4895 static unsigned long
4896 nfs4_set_lock_task_retry(unsigned long timeout)
4897 {
4898         freezable_schedule_timeout_killable_unsafe(timeout);
4899         timeout <<= 1;
4900         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4901                 return NFS4_LOCK_MAXTIMEOUT;
4902         return timeout;
4903 }
4904
4905 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4906 {
4907         struct inode *inode = state->inode;
4908         struct nfs_server *server = NFS_SERVER(inode);
4909         struct nfs_client *clp = server->nfs_client;
4910         struct nfs_lockt_args arg = {
4911                 .fh = NFS_FH(inode),
4912                 .fl = request,
4913         };
4914         struct nfs_lockt_res res = {
4915                 .denied = request,
4916         };
4917         struct rpc_message msg = {
4918                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4919                 .rpc_argp       = &arg,
4920                 .rpc_resp       = &res,
4921                 .rpc_cred       = state->owner->so_cred,
4922         };
4923         struct nfs4_lock_state *lsp;
4924         int status;
4925
4926         arg.lock_owner.clientid = clp->cl_clientid;
4927         status = nfs4_set_lock_state(state, request);
4928         if (status != 0)
4929                 goto out;
4930         lsp = request->fl_u.nfs4_fl.owner;
4931         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4932         arg.lock_owner.s_dev = server->s_dev;
4933         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4934         switch (status) {
4935                 case 0:
4936                         request->fl_type = F_UNLCK;
4937                         break;
4938                 case -NFS4ERR_DENIED:
4939                         status = 0;
4940         }
4941         request->fl_ops->fl_release_private(request);
4942 out:
4943         return status;
4944 }
4945
4946 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4947 {
4948         struct nfs4_exception exception = { };
4949         int err;
4950
4951         do {
4952                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4953                                 _nfs4_proc_getlk(state, cmd, request),
4954                                 &exception);
4955         } while (exception.retry);
4956         return err;
4957 }
4958
4959 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4960 {
4961         int res = 0;
4962         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4963                 case FL_POSIX:
4964                         res = posix_lock_file_wait(file, fl);
4965                         break;
4966                 case FL_FLOCK:
4967                         res = flock_lock_file_wait(file, fl);
4968                         break;
4969                 default:
4970                         BUG();
4971         }
4972         return res;
4973 }
4974
4975 struct nfs4_unlockdata {
4976         struct nfs_locku_args arg;
4977         struct nfs_locku_res res;
4978         struct nfs4_lock_state *lsp;
4979         struct nfs_open_context *ctx;
4980         struct file_lock fl;
4981         const struct nfs_server *server;
4982         unsigned long timestamp;
4983 };
4984
4985 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4986                 struct nfs_open_context *ctx,
4987                 struct nfs4_lock_state *lsp,
4988                 struct nfs_seqid *seqid)
4989 {
4990         struct nfs4_unlockdata *p;
4991         struct inode *inode = lsp->ls_state->inode;
4992
4993         p = kzalloc(sizeof(*p), GFP_NOFS);
4994         if (p == NULL)
4995                 return NULL;
4996         p->arg.fh = NFS_FH(inode);
4997         p->arg.fl = &p->fl;
4998         p->arg.seqid = seqid;
4999         p->res.seqid = seqid;
5000         p->arg.stateid = &lsp->ls_stateid;
5001         p->lsp = lsp;
5002         atomic_inc(&lsp->ls_count);
5003         /* Ensure we don't close file until we're done freeing locks! */
5004         p->ctx = get_nfs_open_context(ctx);
5005         memcpy(&p->fl, fl, sizeof(p->fl));
5006         p->server = NFS_SERVER(inode);
5007         return p;
5008 }
5009
5010 static void nfs4_locku_release_calldata(void *data)
5011 {
5012         struct nfs4_unlockdata *calldata = data;
5013         nfs_free_seqid(calldata->arg.seqid);
5014         nfs4_put_lock_state(calldata->lsp);
5015         put_nfs_open_context(calldata->ctx);
5016         kfree(calldata);
5017 }
5018
5019 static void nfs4_locku_done(struct rpc_task *task, void *data)
5020 {
5021         struct nfs4_unlockdata *calldata = data;
5022
5023         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5024                 return;
5025         switch (task->tk_status) {
5026                 case 0:
5027                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5028                                         &calldata->res.stateid);
5029                         renew_lease(calldata->server, calldata->timestamp);
5030                         break;
5031                 case -NFS4ERR_BAD_STATEID:
5032                 case -NFS4ERR_OLD_STATEID:
5033                 case -NFS4ERR_STALE_STATEID:
5034                 case -NFS4ERR_EXPIRED:
5035                         break;
5036                 default:
5037                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5038                                 rpc_restart_call_prepare(task);
5039         }
5040         nfs_release_seqid(calldata->arg.seqid);
5041 }
5042
5043 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5044 {
5045         struct nfs4_unlockdata *calldata = data;
5046
5047         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5048                 goto out_wait;
5049         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5050                 /* Note: exit _without_ running nfs4_locku_done */
5051                 goto out_no_action;
5052         }
5053         calldata->timestamp = jiffies;
5054         if (nfs4_setup_sequence(calldata->server,
5055                                 &calldata->arg.seq_args,
5056                                 &calldata->res.seq_res,
5057                                 task) != 0)
5058                 nfs_release_seqid(calldata->arg.seqid);
5059         return;
5060 out_no_action:
5061         task->tk_action = NULL;
5062 out_wait:
5063         nfs4_sequence_done(task, &calldata->res.seq_res);
5064 }
5065
5066 static const struct rpc_call_ops nfs4_locku_ops = {
5067         .rpc_call_prepare = nfs4_locku_prepare,
5068         .rpc_call_done = nfs4_locku_done,
5069         .rpc_release = nfs4_locku_release_calldata,
5070 };
5071
5072 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5073                 struct nfs_open_context *ctx,
5074                 struct nfs4_lock_state *lsp,
5075                 struct nfs_seqid *seqid)
5076 {
5077         struct nfs4_unlockdata *data;
5078         struct rpc_message msg = {
5079                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5080                 .rpc_cred = ctx->cred,
5081         };
5082         struct rpc_task_setup task_setup_data = {
5083                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5084                 .rpc_message = &msg,
5085                 .callback_ops = &nfs4_locku_ops,
5086                 .workqueue = nfsiod_workqueue,
5087                 .flags = RPC_TASK_ASYNC,
5088         };
5089
5090         /* Ensure this is an unlock - when canceling a lock, the
5091          * canceled lock is passed in, and it won't be an unlock.
5092          */
5093         fl->fl_type = F_UNLCK;
5094
5095         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5096         if (data == NULL) {
5097                 nfs_free_seqid(seqid);
5098                 return ERR_PTR(-ENOMEM);
5099         }
5100
5101         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5102         msg.rpc_argp = &data->arg;
5103         msg.rpc_resp = &data->res;
5104         task_setup_data.callback_data = data;
5105         return rpc_run_task(&task_setup_data);
5106 }
5107
5108 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5109 {
5110         struct inode *inode = state->inode;
5111         struct nfs4_state_owner *sp = state->owner;
5112         struct nfs_inode *nfsi = NFS_I(inode);
5113         struct nfs_seqid *seqid;
5114         struct nfs4_lock_state *lsp;
5115         struct rpc_task *task;
5116         int status = 0;
5117         unsigned char fl_flags = request->fl_flags;
5118
5119         status = nfs4_set_lock_state(state, request);
5120         /* Unlock _before_ we do the RPC call */
5121         request->fl_flags |= FL_EXISTS;
5122         /* Exclude nfs_delegation_claim_locks() */
5123         mutex_lock(&sp->so_delegreturn_mutex);
5124         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5125         down_read(&nfsi->rwsem);
5126         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5127                 up_read(&nfsi->rwsem);
5128                 mutex_unlock(&sp->so_delegreturn_mutex);
5129                 goto out;
5130         }
5131         up_read(&nfsi->rwsem);
5132         mutex_unlock(&sp->so_delegreturn_mutex);
5133         if (status != 0)
5134                 goto out;
5135         /* Is this a delegated lock? */
5136         lsp = request->fl_u.nfs4_fl.owner;
5137         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5138                 goto out;
5139         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5140         status = -ENOMEM;
5141         if (seqid == NULL)
5142                 goto out;
5143         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5144         status = PTR_ERR(task);
5145         if (IS_ERR(task))
5146                 goto out;
5147         status = nfs4_wait_for_completion_rpc_task(task);
5148         rpc_put_task(task);
5149 out:
5150         request->fl_flags = fl_flags;
5151         return status;
5152 }
5153
5154 struct nfs4_lockdata {
5155         struct nfs_lock_args arg;
5156         struct nfs_lock_res res;
5157         struct nfs4_lock_state *lsp;
5158         struct nfs_open_context *ctx;
5159         struct file_lock fl;
5160         unsigned long timestamp;
5161         int rpc_status;
5162         int cancelled;
5163         struct nfs_server *server;
5164 };
5165
5166 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5167                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5168                 gfp_t gfp_mask)
5169 {
5170         struct nfs4_lockdata *p;
5171         struct inode *inode = lsp->ls_state->inode;
5172         struct nfs_server *server = NFS_SERVER(inode);
5173
5174         p = kzalloc(sizeof(*p), gfp_mask);
5175         if (p == NULL)
5176                 return NULL;
5177
5178         p->arg.fh = NFS_FH(inode);
5179         p->arg.fl = &p->fl;
5180         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5181         if (p->arg.open_seqid == NULL)
5182                 goto out_free;
5183         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5184         if (p->arg.lock_seqid == NULL)
5185                 goto out_free_seqid;
5186         p->arg.lock_stateid = &lsp->ls_stateid;
5187         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5188         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5189         p->arg.lock_owner.s_dev = server->s_dev;
5190         p->res.lock_seqid = p->arg.lock_seqid;
5191         p->lsp = lsp;
5192         p->server = server;
5193         atomic_inc(&lsp->ls_count);
5194         p->ctx = get_nfs_open_context(ctx);
5195         memcpy(&p->fl, fl, sizeof(p->fl));
5196         return p;
5197 out_free_seqid:
5198         nfs_free_seqid(p->arg.open_seqid);
5199 out_free:
5200         kfree(p);
5201         return NULL;
5202 }
5203
5204 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5205 {
5206         struct nfs4_lockdata *data = calldata;
5207         struct nfs4_state *state = data->lsp->ls_state;
5208
5209         dprintk("%s: begin!\n", __func__);
5210         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5211                 goto out_wait;
5212         /* Do we need to do an open_to_lock_owner? */
5213         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5214                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5215                         goto out_release_lock_seqid;
5216                 }
5217                 data->arg.open_stateid = &state->open_stateid;
5218                 data->arg.new_lock_owner = 1;
5219                 data->res.open_seqid = data->arg.open_seqid;
5220         } else
5221                 data->arg.new_lock_owner = 0;
5222         if (!nfs4_valid_open_stateid(state)) {
5223                 data->rpc_status = -EBADF;
5224                 task->tk_action = NULL;
5225                 goto out_release_open_seqid;
5226         }
5227         data->timestamp = jiffies;
5228         if (nfs4_setup_sequence(data->server,
5229                                 &data->arg.seq_args,
5230                                 &data->res.seq_res,
5231                                 task) == 0)
5232                 return;
5233 out_release_open_seqid:
5234         nfs_release_seqid(data->arg.open_seqid);
5235 out_release_lock_seqid:
5236         nfs_release_seqid(data->arg.lock_seqid);
5237 out_wait:
5238         nfs4_sequence_done(task, &data->res.seq_res);
5239         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5240 }
5241
5242 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5243 {
5244         struct nfs4_lockdata *data = calldata;
5245
5246         dprintk("%s: begin!\n", __func__);
5247
5248         if (!nfs4_sequence_done(task, &data->res.seq_res))
5249                 return;
5250
5251         data->rpc_status = task->tk_status;
5252         if (data->arg.new_lock_owner != 0) {
5253                 if (data->rpc_status == 0)
5254                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5255                 else
5256                         goto out;
5257         }
5258         if (data->rpc_status == 0) {
5259                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5260                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5261                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5262         }
5263 out:
5264         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5265 }
5266
5267 static void nfs4_lock_release(void *calldata)
5268 {
5269         struct nfs4_lockdata *data = calldata;
5270
5271         dprintk("%s: begin!\n", __func__);
5272         nfs_free_seqid(data->arg.open_seqid);
5273         if (data->cancelled != 0) {
5274                 struct rpc_task *task;
5275                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5276                                 data->arg.lock_seqid);
5277                 if (!IS_ERR(task))
5278                         rpc_put_task_async(task);
5279                 dprintk("%s: cancelling lock!\n", __func__);
5280         } else
5281                 nfs_free_seqid(data->arg.lock_seqid);
5282         nfs4_put_lock_state(data->lsp);
5283         put_nfs_open_context(data->ctx);
5284         kfree(data);
5285         dprintk("%s: done!\n", __func__);
5286 }
5287
5288 static const struct rpc_call_ops nfs4_lock_ops = {
5289         .rpc_call_prepare = nfs4_lock_prepare,
5290         .rpc_call_done = nfs4_lock_done,
5291         .rpc_release = nfs4_lock_release,
5292 };
5293
5294 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5295 {
5296         switch (error) {
5297         case -NFS4ERR_ADMIN_REVOKED:
5298         case -NFS4ERR_BAD_STATEID:
5299                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5300                 if (new_lock_owner != 0 ||
5301                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5302                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5303                 break;
5304         case -NFS4ERR_STALE_STATEID:
5305                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5306         case -NFS4ERR_EXPIRED:
5307                 nfs4_schedule_lease_recovery(server->nfs_client);
5308         };
5309 }
5310
5311 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5312 {
5313         struct nfs4_lockdata *data;
5314         struct rpc_task *task;
5315         struct rpc_message msg = {
5316                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5317                 .rpc_cred = state->owner->so_cred,
5318         };
5319         struct rpc_task_setup task_setup_data = {
5320                 .rpc_client = NFS_CLIENT(state->inode),
5321                 .rpc_message = &msg,
5322                 .callback_ops = &nfs4_lock_ops,
5323                 .workqueue = nfsiod_workqueue,
5324                 .flags = RPC_TASK_ASYNC,
5325         };
5326         int ret;
5327
5328         dprintk("%s: begin!\n", __func__);
5329         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5330                         fl->fl_u.nfs4_fl.owner,
5331                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5332         if (data == NULL)
5333                 return -ENOMEM;
5334         if (IS_SETLKW(cmd))
5335                 data->arg.block = 1;
5336         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5337         msg.rpc_argp = &data->arg;
5338         msg.rpc_resp = &data->res;
5339         task_setup_data.callback_data = data;
5340         if (recovery_type > NFS_LOCK_NEW) {
5341                 if (recovery_type == NFS_LOCK_RECLAIM)
5342                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5343                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5344         }
5345         task = rpc_run_task(&task_setup_data);
5346         if (IS_ERR(task))
5347                 return PTR_ERR(task);
5348         ret = nfs4_wait_for_completion_rpc_task(task);
5349         if (ret == 0) {
5350                 ret = data->rpc_status;
5351                 if (ret)
5352                         nfs4_handle_setlk_error(data->server, data->lsp,
5353                                         data->arg.new_lock_owner, ret);
5354         } else
5355                 data->cancelled = 1;
5356         rpc_put_task(task);
5357         dprintk("%s: done, ret = %d!\n", __func__, ret);
5358         return ret;
5359 }
5360
5361 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5362 {
5363         struct nfs_server *server = NFS_SERVER(state->inode);
5364         struct nfs4_exception exception = {
5365                 .inode = state->inode,
5366         };
5367         int err;
5368
5369         do {
5370                 /* Cache the lock if possible... */
5371                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5372                         return 0;
5373                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5374                 if (err != -NFS4ERR_DELAY)
5375                         break;
5376                 nfs4_handle_exception(server, err, &exception);
5377         } while (exception.retry);
5378         return err;
5379 }
5380
5381 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5382 {
5383         struct nfs_server *server = NFS_SERVER(state->inode);
5384         struct nfs4_exception exception = {
5385                 .inode = state->inode,
5386         };
5387         int err;
5388
5389         err = nfs4_set_lock_state(state, request);
5390         if (err != 0)
5391                 return err;
5392         do {
5393                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5394                         return 0;
5395                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5396                 switch (err) {
5397                 default:
5398                         goto out;
5399                 case -NFS4ERR_GRACE:
5400                 case -NFS4ERR_DELAY:
5401                         nfs4_handle_exception(server, err, &exception);
5402                         err = 0;
5403                 }
5404         } while (exception.retry);
5405 out:
5406         return err;
5407 }
5408
5409 #if defined(CONFIG_NFS_V4_1)
5410 /**
5411  * nfs41_check_expired_locks - possibly free a lock stateid
5412  *
5413  * @state: NFSv4 state for an inode
5414  *
5415  * Returns NFS_OK if recovery for this stateid is now finished.
5416  * Otherwise a negative NFS4ERR value is returned.
5417  */
5418 static int nfs41_check_expired_locks(struct nfs4_state *state)
5419 {
5420         int status, ret = -NFS4ERR_BAD_STATEID;
5421         struct nfs4_lock_state *lsp;
5422         struct nfs_server *server = NFS_SERVER(state->inode);
5423
5424         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5425                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5426                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5427
5428                         status = nfs41_test_stateid(server,
5429                                         &lsp->ls_stateid,
5430                                         cred);
5431                         if (status != NFS_OK) {
5432                                 /* Free the stateid unless the server
5433                                  * informs us the stateid is unrecognized. */
5434                                 if (status != -NFS4ERR_BAD_STATEID)
5435                                         nfs41_free_stateid(server,
5436                                                         &lsp->ls_stateid,
5437                                                         cred);
5438                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5439                                 ret = status;
5440                         }
5441                 }
5442         };
5443
5444         return ret;
5445 }
5446
5447 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5448 {
5449         int status = NFS_OK;
5450
5451         if (test_bit(LK_STATE_IN_USE, &state->flags))
5452                 status = nfs41_check_expired_locks(state);
5453         if (status != NFS_OK)
5454                 status = nfs4_lock_expired(state, request);
5455         return status;
5456 }
5457 #endif
5458
5459 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5460 {
5461         struct nfs4_state_owner *sp = state->owner;
5462         struct nfs_inode *nfsi = NFS_I(state->inode);
5463         unsigned char fl_flags = request->fl_flags;
5464         unsigned int seq;
5465         int status = -ENOLCK;
5466
5467         if ((fl_flags & FL_POSIX) &&
5468                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5469                 goto out;
5470         /* Is this a delegated open? */
5471         status = nfs4_set_lock_state(state, request);
5472         if (status != 0)
5473                 goto out;
5474         request->fl_flags |= FL_ACCESS;
5475         status = do_vfs_lock(request->fl_file, request);
5476         if (status < 0)
5477                 goto out;
5478         down_read(&nfsi->rwsem);
5479         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5480                 /* Yes: cache locks! */
5481                 /* ...but avoid races with delegation recall... */
5482                 request->fl_flags = fl_flags & ~FL_SLEEP;
5483                 status = do_vfs_lock(request->fl_file, request);
5484                 goto out_unlock;
5485         }
5486         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5487         up_read(&nfsi->rwsem);
5488         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5489         if (status != 0)
5490                 goto out;
5491         down_read(&nfsi->rwsem);
5492         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5493                 status = -NFS4ERR_DELAY;
5494                 goto out_unlock;
5495         }
5496         /* Note: we always want to sleep here! */
5497         request->fl_flags = fl_flags | FL_SLEEP;
5498         if (do_vfs_lock(request->fl_file, request) < 0)
5499                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5500                         "manager!\n", __func__);
5501 out_unlock:
5502         up_read(&nfsi->rwsem);
5503 out:
5504         request->fl_flags = fl_flags;
5505         return status;
5506 }
5507
5508 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5509 {
5510         struct nfs4_exception exception = {
5511                 .state = state,
5512                 .inode = state->inode,
5513         };
5514         int err;
5515
5516         do {
5517                 err = _nfs4_proc_setlk(state, cmd, request);
5518                 if (err == -NFS4ERR_DENIED)
5519                         err = -EAGAIN;
5520                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5521                                 err, &exception);
5522         } while (exception.retry);
5523         return err;
5524 }
5525
5526 static int
5527 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5528 {
5529         struct nfs_open_context *ctx;
5530         struct nfs4_state *state;
5531         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5532         int status;
5533
5534         /* verify open state */
5535         ctx = nfs_file_open_context(filp);
5536         state = ctx->state;
5537
5538         if (request->fl_start < 0 || request->fl_end < 0)
5539                 return -EINVAL;
5540
5541         if (IS_GETLK(cmd)) {
5542                 if (state != NULL)
5543                         return nfs4_proc_getlk(state, F_GETLK, request);
5544                 return 0;
5545         }
5546
5547         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5548                 return -EINVAL;
5549
5550         if (request->fl_type == F_UNLCK) {
5551                 if (state != NULL)
5552                         return nfs4_proc_unlck(state, cmd, request);
5553                 return 0;
5554         }
5555
5556         if (state == NULL)
5557                 return -ENOLCK;
5558         /*
5559          * Don't rely on the VFS having checked the file open mode,
5560          * since it won't do this for flock() locks.
5561          */
5562         switch (request->fl_type) {
5563         case F_RDLCK:
5564                 if (!(filp->f_mode & FMODE_READ))
5565                         return -EBADF;
5566                 break;
5567         case F_WRLCK:
5568                 if (!(filp->f_mode & FMODE_WRITE))
5569                         return -EBADF;
5570         }
5571
5572         do {
5573                 status = nfs4_proc_setlk(state, cmd, request);
5574                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5575                         break;
5576                 timeout = nfs4_set_lock_task_retry(timeout);
5577                 status = -ERESTARTSYS;
5578                 if (signalled())
5579                         break;
5580         } while(status < 0);
5581         return status;
5582 }
5583
5584 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5585 {
5586         struct nfs_server *server = NFS_SERVER(state->inode);
5587         int err;
5588
5589         err = nfs4_set_lock_state(state, fl);
5590         if (err != 0)
5591                 return err;
5592         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5593         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5594 }
5595
5596 struct nfs_release_lockowner_data {
5597         struct nfs4_lock_state *lsp;
5598         struct nfs_server *server;
5599         struct nfs_release_lockowner_args args;
5600 };
5601
5602 static void nfs4_release_lockowner_release(void *calldata)
5603 {
5604         struct nfs_release_lockowner_data *data = calldata;
5605         nfs4_free_lock_state(data->server, data->lsp);
5606         kfree(calldata);
5607 }
5608
5609 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5610         .rpc_release = nfs4_release_lockowner_release,
5611 };
5612
5613 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5614 {
5615         struct nfs_release_lockowner_data *data;
5616         struct rpc_message msg = {
5617                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5618         };
5619
5620         if (server->nfs_client->cl_mvops->minor_version != 0)
5621                 return -EINVAL;
5622         data = kmalloc(sizeof(*data), GFP_NOFS);
5623         if (!data)
5624                 return -ENOMEM;
5625         data->lsp = lsp;
5626         data->server = server;
5627         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5628         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5629         data->args.lock_owner.s_dev = server->s_dev;
5630         msg.rpc_argp = &data->args;
5631         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5632         return 0;
5633 }
5634
5635 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5636
5637 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5638                                    const void *buf, size_t buflen,
5639                                    int flags, int type)
5640 {
5641         if (strcmp(key, "") != 0)
5642                 return -EINVAL;
5643
5644         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5645 }
5646
5647 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5648                                    void *buf, size_t buflen, int type)
5649 {
5650         if (strcmp(key, "") != 0)
5651                 return -EINVAL;
5652
5653         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5654 }
5655
5656 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5657                                        size_t list_len, const char *name,
5658                                        size_t name_len, int type)
5659 {
5660         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5661
5662         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5663                 return 0;
5664
5665         if (list && len <= list_len)
5666                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5667         return len;
5668 }
5669
5670 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5671 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5672 {
5673         return server->caps & NFS_CAP_SECURITY_LABEL;
5674 }
5675
5676 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5677                                    const void *buf, size_t buflen,
5678                                    int flags, int type)
5679 {
5680         if (security_ismaclabel(key))
5681                 return nfs4_set_security_label(dentry, buf, buflen);
5682
5683         return -EOPNOTSUPP;
5684 }
5685
5686 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5687                                    void *buf, size_t buflen, int type)
5688 {
5689         if (security_ismaclabel(key))
5690                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5691         return -EOPNOTSUPP;
5692 }
5693
5694 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5695                                        size_t list_len, const char *name,
5696                                        size_t name_len, int type)
5697 {
5698         size_t len = 0;
5699
5700         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5701                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5702                 if (list && len <= list_len)
5703                         security_inode_listsecurity(dentry->d_inode, list, len);
5704         }
5705         return len;
5706 }
5707
5708 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5709         .prefix = XATTR_SECURITY_PREFIX,
5710         .list   = nfs4_xattr_list_nfs4_label,
5711         .get    = nfs4_xattr_get_nfs4_label,
5712         .set    = nfs4_xattr_set_nfs4_label,
5713 };
5714 #endif
5715
5716
5717 /*
5718  * nfs_fhget will use either the mounted_on_fileid or the fileid
5719  */
5720 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5721 {
5722         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5723                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5724               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5725               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5726                 return;
5727
5728         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5729                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5730         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5731         fattr->nlink = 2;
5732 }
5733
5734 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5735                                    const struct qstr *name,
5736                                    struct nfs4_fs_locations *fs_locations,
5737                                    struct page *page)
5738 {
5739         struct nfs_server *server = NFS_SERVER(dir);
5740         u32 bitmask[3] = {
5741                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5742         };
5743         struct nfs4_fs_locations_arg args = {
5744                 .dir_fh = NFS_FH(dir),
5745                 .name = name,
5746                 .page = page,
5747                 .bitmask = bitmask,
5748         };
5749         struct nfs4_fs_locations_res res = {
5750                 .fs_locations = fs_locations,
5751         };
5752         struct rpc_message msg = {
5753                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5754                 .rpc_argp = &args,
5755                 .rpc_resp = &res,
5756         };
5757         int status;
5758
5759         dprintk("%s: start\n", __func__);
5760
5761         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5762          * is not supported */
5763         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5764                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5765         else
5766                 bitmask[0] |= FATTR4_WORD0_FILEID;
5767
5768         nfs_fattr_init(&fs_locations->fattr);
5769         fs_locations->server = server;
5770         fs_locations->nlocations = 0;
5771         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5772         dprintk("%s: returned status = %d\n", __func__, status);
5773         return status;
5774 }
5775
5776 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5777                            const struct qstr *name,
5778                            struct nfs4_fs_locations *fs_locations,
5779                            struct page *page)
5780 {
5781         struct nfs4_exception exception = { };
5782         int err;
5783         do {
5784                 err = nfs4_handle_exception(NFS_SERVER(dir),
5785                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5786                                 &exception);
5787         } while (exception.retry);
5788         return err;
5789 }
5790
5791 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5792 {
5793         int status;
5794         struct nfs4_secinfo_arg args = {
5795                 .dir_fh = NFS_FH(dir),
5796                 .name   = name,
5797         };
5798         struct nfs4_secinfo_res res = {
5799                 .flavors     = flavors,
5800         };
5801         struct rpc_message msg = {
5802                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5803                 .rpc_argp = &args,
5804                 .rpc_resp = &res,
5805         };
5806
5807         dprintk("NFS call  secinfo %s\n", name->name);
5808         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5809         dprintk("NFS reply  secinfo: %d\n", status);
5810         return status;
5811 }
5812
5813 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5814                       struct nfs4_secinfo_flavors *flavors)
5815 {
5816         struct nfs4_exception exception = { };
5817         int err;
5818         do {
5819                 err = nfs4_handle_exception(NFS_SERVER(dir),
5820                                 _nfs4_proc_secinfo(dir, name, flavors),
5821                                 &exception);
5822         } while (exception.retry);
5823         return err;
5824 }
5825
5826 #ifdef CONFIG_NFS_V4_1
5827 /*
5828  * Check the exchange flags returned by the server for invalid flags, having
5829  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5830  * DS flags set.
5831  */
5832 static int nfs4_check_cl_exchange_flags(u32 flags)
5833 {
5834         if (flags & ~EXCHGID4_FLAG_MASK_R)
5835                 goto out_inval;
5836         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5837             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5838                 goto out_inval;
5839         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5840                 goto out_inval;
5841         return NFS_OK;
5842 out_inval:
5843         return -NFS4ERR_INVAL;
5844 }
5845
5846 static bool
5847 nfs41_same_server_scope(struct nfs41_server_scope *a,
5848                         struct nfs41_server_scope *b)
5849 {
5850         if (a->server_scope_sz == b->server_scope_sz &&
5851             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5852                 return true;
5853
5854         return false;
5855 }
5856
5857 /*
5858  * nfs4_proc_bind_conn_to_session()
5859  *
5860  * The 4.1 client currently uses the same TCP connection for the
5861  * fore and backchannel.
5862  */
5863 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5864 {
5865         int status;
5866         struct nfs41_bind_conn_to_session_res res;
5867         struct rpc_message msg = {
5868                 .rpc_proc =
5869                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5870                 .rpc_argp = clp,
5871                 .rpc_resp = &res,
5872                 .rpc_cred = cred,
5873         };
5874
5875         dprintk("--> %s\n", __func__);
5876
5877         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5878         if (unlikely(res.session == NULL)) {
5879                 status = -ENOMEM;
5880                 goto out;
5881         }
5882
5883         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5884         if (status == 0) {
5885                 if (memcmp(res.session->sess_id.data,
5886                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5887                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5888                         status = -EIO;
5889                         goto out_session;
5890                 }
5891                 if (res.dir != NFS4_CDFS4_BOTH) {
5892                         dprintk("NFS: %s: Unexpected direction from server\n",
5893                                 __func__);
5894                         status = -EIO;
5895                         goto out_session;
5896                 }
5897                 if (res.use_conn_in_rdma_mode) {
5898                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5899                                 __func__);
5900                         status = -EIO;
5901                         goto out_session;
5902                 }
5903         }
5904 out_session:
5905         kfree(res.session);
5906 out:
5907         dprintk("<-- %s status= %d\n", __func__, status);
5908         return status;
5909 }
5910
5911 /*
5912  * nfs4_proc_exchange_id()
5913  *
5914  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5915  *
5916  * Since the clientid has expired, all compounds using sessions
5917  * associated with the stale clientid will be returning
5918  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5919  * be in some phase of session reset.
5920  */
5921 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5922 {
5923         nfs4_verifier verifier;
5924         struct nfs41_exchange_id_args args = {
5925                 .verifier = &verifier,
5926                 .client = clp,
5927                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
5928                         EXCHGID4_FLAG_BIND_PRINC_STATEID,
5929         };
5930         struct nfs41_exchange_id_res res = {
5931                 0
5932         };
5933         int status;
5934         struct rpc_message msg = {
5935                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5936                 .rpc_argp = &args,
5937                 .rpc_resp = &res,
5938                 .rpc_cred = cred,
5939         };
5940
5941         nfs4_init_boot_verifier(clp, &verifier);
5942         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5943                                                         sizeof(args.id));
5944         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5945                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5946                 args.id_len, args.id);
5947
5948         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5949                                         GFP_NOFS);
5950         if (unlikely(res.server_owner == NULL)) {
5951                 status = -ENOMEM;
5952                 goto out;
5953         }
5954
5955         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5956                                         GFP_NOFS);
5957         if (unlikely(res.server_scope == NULL)) {
5958                 status = -ENOMEM;
5959                 goto out_server_owner;
5960         }
5961
5962         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5963         if (unlikely(res.impl_id == NULL)) {
5964                 status = -ENOMEM;
5965                 goto out_server_scope;
5966         }
5967
5968         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5969         if (status == 0)
5970                 status = nfs4_check_cl_exchange_flags(res.flags);
5971
5972         if (status == 0) {
5973                 clp->cl_clientid = res.clientid;
5974                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5975                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5976                         clp->cl_seqid = res.seqid;
5977
5978                 kfree(clp->cl_serverowner);
5979                 clp->cl_serverowner = res.server_owner;
5980                 res.server_owner = NULL;
5981
5982                 /* use the most recent implementation id */
5983                 kfree(clp->cl_implid);
5984                 clp->cl_implid = res.impl_id;
5985
5986                 if (clp->cl_serverscope != NULL &&
5987                     !nfs41_same_server_scope(clp->cl_serverscope,
5988                                              res.server_scope)) {
5989                         dprintk("%s: server_scope mismatch detected\n",
5990                                 __func__);
5991                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5992                         kfree(clp->cl_serverscope);
5993                         clp->cl_serverscope = NULL;
5994                 }
5995
5996                 if (clp->cl_serverscope == NULL) {
5997                         clp->cl_serverscope = res.server_scope;
5998                         goto out;
5999                 }
6000         } else
6001                 kfree(res.impl_id);
6002
6003 out_server_owner:
6004         kfree(res.server_owner);
6005 out_server_scope:
6006         kfree(res.server_scope);
6007 out:
6008         if (clp->cl_implid != NULL)
6009                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6010                         "domain: %s, name: %s, date: %llu,%u\n",
6011                         clp->cl_implid->domain, clp->cl_implid->name,
6012                         clp->cl_implid->date.seconds,
6013                         clp->cl_implid->date.nseconds);
6014         dprintk("NFS reply exchange_id: %d\n", status);
6015         return status;
6016 }
6017
6018 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6019                 struct rpc_cred *cred)
6020 {
6021         struct rpc_message msg = {
6022                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6023                 .rpc_argp = clp,
6024                 .rpc_cred = cred,
6025         };
6026         int status;
6027
6028         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6029         if (status)
6030                 dprintk("NFS: Got error %d from the server %s on "
6031                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6032         return status;
6033 }
6034
6035 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6036                 struct rpc_cred *cred)
6037 {
6038         unsigned int loop;
6039         int ret;
6040
6041         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6042                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6043                 switch (ret) {
6044                 case -NFS4ERR_DELAY:
6045                 case -NFS4ERR_CLIENTID_BUSY:
6046                         ssleep(1);
6047                         break;
6048                 default:
6049                         return ret;
6050                 }
6051         }
6052         return 0;
6053 }
6054
6055 int nfs4_destroy_clientid(struct nfs_client *clp)
6056 {
6057         struct rpc_cred *cred;
6058         int ret = 0;
6059
6060         if (clp->cl_mvops->minor_version < 1)
6061                 goto out;
6062         if (clp->cl_exchange_flags == 0)
6063                 goto out;
6064         if (clp->cl_preserve_clid)
6065                 goto out;
6066         cred = nfs4_get_exchange_id_cred(clp);
6067         ret = nfs4_proc_destroy_clientid(clp, cred);
6068         if (cred)
6069                 put_rpccred(cred);
6070         switch (ret) {
6071         case 0:
6072         case -NFS4ERR_STALE_CLIENTID:
6073                 clp->cl_exchange_flags = 0;
6074         }
6075 out:
6076         return ret;
6077 }
6078
6079 struct nfs4_get_lease_time_data {
6080         struct nfs4_get_lease_time_args *args;
6081         struct nfs4_get_lease_time_res *res;
6082         struct nfs_client *clp;
6083 };
6084
6085 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6086                                         void *calldata)
6087 {
6088         struct nfs4_get_lease_time_data *data =
6089                         (struct nfs4_get_lease_time_data *)calldata;
6090
6091         dprintk("--> %s\n", __func__);
6092         /* just setup sequence, do not trigger session recovery
6093            since we're invoked within one */
6094         nfs41_setup_sequence(data->clp->cl_session,
6095                         &data->args->la_seq_args,
6096                         &data->res->lr_seq_res,
6097                         task);
6098         dprintk("<-- %s\n", __func__);
6099 }
6100
6101 /*
6102  * Called from nfs4_state_manager thread for session setup, so don't recover
6103  * from sequence operation or clientid errors.
6104  */
6105 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6106 {
6107         struct nfs4_get_lease_time_data *data =
6108                         (struct nfs4_get_lease_time_data *)calldata;
6109
6110         dprintk("--> %s\n", __func__);
6111         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6112                 return;
6113         switch (task->tk_status) {
6114         case -NFS4ERR_DELAY:
6115         case -NFS4ERR_GRACE:
6116                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6117                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6118                 task->tk_status = 0;
6119                 /* fall through */
6120         case -NFS4ERR_RETRY_UNCACHED_REP:
6121                 rpc_restart_call_prepare(task);
6122                 return;
6123         }
6124         dprintk("<-- %s\n", __func__);
6125 }
6126
6127 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6128         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6129         .rpc_call_done = nfs4_get_lease_time_done,
6130 };
6131
6132 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6133 {
6134         struct rpc_task *task;
6135         struct nfs4_get_lease_time_args args;
6136         struct nfs4_get_lease_time_res res = {
6137                 .lr_fsinfo = fsinfo,
6138         };
6139         struct nfs4_get_lease_time_data data = {
6140                 .args = &args,
6141                 .res = &res,
6142                 .clp = clp,
6143         };
6144         struct rpc_message msg = {
6145                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6146                 .rpc_argp = &args,
6147                 .rpc_resp = &res,
6148         };
6149         struct rpc_task_setup task_setup = {
6150                 .rpc_client = clp->cl_rpcclient,
6151                 .rpc_message = &msg,
6152                 .callback_ops = &nfs4_get_lease_time_ops,
6153                 .callback_data = &data,
6154                 .flags = RPC_TASK_TIMEOUT,
6155         };
6156         int status;
6157
6158         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6159         nfs4_set_sequence_privileged(&args.la_seq_args);
6160         dprintk("--> %s\n", __func__);
6161         task = rpc_run_task(&task_setup);
6162
6163         if (IS_ERR(task))
6164                 status = PTR_ERR(task);
6165         else {
6166                 status = task->tk_status;
6167                 rpc_put_task(task);
6168         }
6169         dprintk("<-- %s return %d\n", __func__, status);
6170
6171         return status;
6172 }
6173
6174 /*
6175  * Initialize the values to be used by the client in CREATE_SESSION
6176  * If nfs4_init_session set the fore channel request and response sizes,
6177  * use them.
6178  *
6179  * Set the back channel max_resp_sz_cached to zero to force the client to
6180  * always set csa_cachethis to FALSE because the current implementation
6181  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6182  */
6183 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6184 {
6185         unsigned int max_rqst_sz, max_resp_sz;
6186
6187         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6188         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6189
6190         /* Fore channel attributes */
6191         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6192         args->fc_attrs.max_resp_sz = max_resp_sz;
6193         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6194         args->fc_attrs.max_reqs = max_session_slots;
6195
6196         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6197                 "max_ops=%u max_reqs=%u\n",
6198                 __func__,
6199                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6200                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6201
6202         /* Back channel attributes */
6203         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6204         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6205         args->bc_attrs.max_resp_sz_cached = 0;
6206         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6207         args->bc_attrs.max_reqs = 1;
6208
6209         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6210                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6211                 __func__,
6212                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6213                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6214                 args->bc_attrs.max_reqs);
6215 }
6216
6217 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6218 {
6219         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6220         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6221
6222         if (rcvd->max_resp_sz > sent->max_resp_sz)
6223                 return -EINVAL;
6224         /*
6225          * Our requested max_ops is the minimum we need; we're not
6226          * prepared to break up compounds into smaller pieces than that.
6227          * So, no point even trying to continue if the server won't
6228          * cooperate:
6229          */
6230         if (rcvd->max_ops < sent->max_ops)
6231                 return -EINVAL;
6232         if (rcvd->max_reqs == 0)
6233                 return -EINVAL;
6234         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6235                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6236         return 0;
6237 }
6238
6239 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6240 {
6241         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6242         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6243
6244         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6245                 return -EINVAL;
6246         if (rcvd->max_resp_sz < sent->max_resp_sz)
6247                 return -EINVAL;
6248         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6249                 return -EINVAL;
6250         /* These would render the backchannel useless: */
6251         if (rcvd->max_ops != sent->max_ops)
6252                 return -EINVAL;
6253         if (rcvd->max_reqs != sent->max_reqs)
6254                 return -EINVAL;
6255         return 0;
6256 }
6257
6258 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6259                                      struct nfs4_session *session)
6260 {
6261         int ret;
6262
6263         ret = nfs4_verify_fore_channel_attrs(args, session);
6264         if (ret)
6265                 return ret;
6266         return nfs4_verify_back_channel_attrs(args, session);
6267 }
6268
6269 static int _nfs4_proc_create_session(struct nfs_client *clp,
6270                 struct rpc_cred *cred)
6271 {
6272         struct nfs4_session *session = clp->cl_session;
6273         struct nfs41_create_session_args args = {
6274                 .client = clp,
6275                 .cb_program = NFS4_CALLBACK,
6276         };
6277         struct nfs41_create_session_res res = {
6278                 .client = clp,
6279         };
6280         struct rpc_message msg = {
6281                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6282                 .rpc_argp = &args,
6283                 .rpc_resp = &res,
6284                 .rpc_cred = cred,
6285         };
6286         int status;
6287
6288         nfs4_init_channel_attrs(&args);
6289         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6290
6291         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6292
6293         if (!status) {
6294                 /* Verify the session's negotiated channel_attrs values */
6295                 status = nfs4_verify_channel_attrs(&args, session);
6296                 /* Increment the clientid slot sequence id */
6297                 clp->cl_seqid++;
6298         }
6299
6300         return status;
6301 }
6302
6303 /*
6304  * Issues a CREATE_SESSION operation to the server.
6305  * It is the responsibility of the caller to verify the session is
6306  * expired before calling this routine.
6307  */
6308 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6309 {
6310         int status;
6311         unsigned *ptr;
6312         struct nfs4_session *session = clp->cl_session;
6313
6314         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6315
6316         status = _nfs4_proc_create_session(clp, cred);
6317         if (status)
6318                 goto out;
6319
6320         /* Init or reset the session slot tables */
6321         status = nfs4_setup_session_slot_tables(session);
6322         dprintk("slot table setup returned %d\n", status);
6323         if (status)
6324                 goto out;
6325
6326         ptr = (unsigned *)&session->sess_id.data[0];
6327         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6328                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6329 out:
6330         dprintk("<-- %s\n", __func__);
6331         return status;
6332 }
6333
6334 /*
6335  * Issue the over-the-wire RPC DESTROY_SESSION.
6336  * The caller must serialize access to this routine.
6337  */
6338 int nfs4_proc_destroy_session(struct nfs4_session *session,
6339                 struct rpc_cred *cred)
6340 {
6341         struct rpc_message msg = {
6342                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6343                 .rpc_argp = session,
6344                 .rpc_cred = cred,
6345         };
6346         int status = 0;
6347
6348         dprintk("--> nfs4_proc_destroy_session\n");
6349
6350         /* session is still being setup */
6351         if (session->clp->cl_cons_state != NFS_CS_READY)
6352                 return status;
6353
6354         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6355
6356         if (status)
6357                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6358                         "Session has been destroyed regardless...\n", status);
6359
6360         dprintk("<-- nfs4_proc_destroy_session\n");
6361         return status;
6362 }
6363
6364 /*
6365  * Renew the cl_session lease.
6366  */
6367 struct nfs4_sequence_data {
6368         struct nfs_client *clp;
6369         struct nfs4_sequence_args args;
6370         struct nfs4_sequence_res res;
6371 };
6372
6373 static void nfs41_sequence_release(void *data)
6374 {
6375         struct nfs4_sequence_data *calldata = data;
6376         struct nfs_client *clp = calldata->clp;
6377
6378         if (atomic_read(&clp->cl_count) > 1)
6379                 nfs4_schedule_state_renewal(clp);
6380         nfs_put_client(clp);
6381         kfree(calldata);
6382 }
6383
6384 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6385 {
6386         switch(task->tk_status) {
6387         case -NFS4ERR_DELAY:
6388                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6389                 return -EAGAIN;
6390         default:
6391                 nfs4_schedule_lease_recovery(clp);
6392         }
6393         return 0;
6394 }
6395
6396 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6397 {
6398         struct nfs4_sequence_data *calldata = data;
6399         struct nfs_client *clp = calldata->clp;
6400
6401         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6402                 return;
6403
6404         if (task->tk_status < 0) {
6405                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6406                 if (atomic_read(&clp->cl_count) == 1)
6407                         goto out;
6408
6409                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6410                         rpc_restart_call_prepare(task);
6411                         return;
6412                 }
6413         }
6414         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6415 out:
6416         dprintk("<-- %s\n", __func__);
6417 }
6418
6419 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6420 {
6421         struct nfs4_sequence_data *calldata = data;
6422         struct nfs_client *clp = calldata->clp;
6423         struct nfs4_sequence_args *args;
6424         struct nfs4_sequence_res *res;
6425
6426         args = task->tk_msg.rpc_argp;
6427         res = task->tk_msg.rpc_resp;
6428
6429         nfs41_setup_sequence(clp->cl_session, args, res, task);
6430 }
6431
6432 static const struct rpc_call_ops nfs41_sequence_ops = {
6433         .rpc_call_done = nfs41_sequence_call_done,
6434         .rpc_call_prepare = nfs41_sequence_prepare,
6435         .rpc_release = nfs41_sequence_release,
6436 };
6437
6438 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6439                 struct rpc_cred *cred,
6440                 bool is_privileged)
6441 {
6442         struct nfs4_sequence_data *calldata;
6443         struct rpc_message msg = {
6444                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6445                 .rpc_cred = cred,
6446         };
6447         struct rpc_task_setup task_setup_data = {
6448                 .rpc_client = clp->cl_rpcclient,
6449                 .rpc_message = &msg,
6450                 .callback_ops = &nfs41_sequence_ops,
6451                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6452         };
6453
6454         if (!atomic_inc_not_zero(&clp->cl_count))
6455                 return ERR_PTR(-EIO);
6456         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6457         if (calldata == NULL) {
6458                 nfs_put_client(clp);
6459                 return ERR_PTR(-ENOMEM);
6460         }
6461         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6462         if (is_privileged)
6463                 nfs4_set_sequence_privileged(&calldata->args);
6464         msg.rpc_argp = &calldata->args;
6465         msg.rpc_resp = &calldata->res;
6466         calldata->clp = clp;
6467         task_setup_data.callback_data = calldata;
6468
6469         return rpc_run_task(&task_setup_data);
6470 }
6471
6472 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6473 {
6474         struct rpc_task *task;
6475         int ret = 0;
6476
6477         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6478                 return 0;
6479         task = _nfs41_proc_sequence(clp, cred, false);
6480         if (IS_ERR(task))
6481                 ret = PTR_ERR(task);
6482         else
6483                 rpc_put_task_async(task);
6484         dprintk("<-- %s status=%d\n", __func__, ret);
6485         return ret;
6486 }
6487
6488 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6489 {
6490         struct rpc_task *task;
6491         int ret;
6492
6493         task = _nfs41_proc_sequence(clp, cred, true);
6494         if (IS_ERR(task)) {
6495                 ret = PTR_ERR(task);
6496                 goto out;
6497         }
6498         ret = rpc_wait_for_completion_task(task);
6499         if (!ret) {
6500                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6501
6502                 if (task->tk_status == 0)
6503                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6504                 ret = task->tk_status;
6505         }
6506         rpc_put_task(task);
6507 out:
6508         dprintk("<-- %s status=%d\n", __func__, ret);
6509         return ret;
6510 }
6511
6512 struct nfs4_reclaim_complete_data {
6513         struct nfs_client *clp;
6514         struct nfs41_reclaim_complete_args arg;
6515         struct nfs41_reclaim_complete_res res;
6516 };
6517
6518 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6519 {
6520         struct nfs4_reclaim_complete_data *calldata = data;
6521
6522         nfs41_setup_sequence(calldata->clp->cl_session,
6523                         &calldata->arg.seq_args,
6524                         &calldata->res.seq_res,
6525                         task);
6526 }
6527
6528 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6529 {
6530         switch(task->tk_status) {
6531         case 0:
6532         case -NFS4ERR_COMPLETE_ALREADY:
6533         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6534                 break;
6535         case -NFS4ERR_DELAY:
6536                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6537                 /* fall through */
6538         case -NFS4ERR_RETRY_UNCACHED_REP:
6539                 return -EAGAIN;
6540         default:
6541                 nfs4_schedule_lease_recovery(clp);
6542         }
6543         return 0;
6544 }
6545
6546 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6547 {
6548         struct nfs4_reclaim_complete_data *calldata = data;
6549         struct nfs_client *clp = calldata->clp;
6550         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6551
6552         dprintk("--> %s\n", __func__);
6553         if (!nfs41_sequence_done(task, res))
6554                 return;
6555
6556         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6557                 rpc_restart_call_prepare(task);
6558                 return;
6559         }
6560         dprintk("<-- %s\n", __func__);
6561 }
6562
6563 static void nfs4_free_reclaim_complete_data(void *data)
6564 {
6565         struct nfs4_reclaim_complete_data *calldata = data;
6566
6567         kfree(calldata);
6568 }
6569
6570 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6571         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6572         .rpc_call_done = nfs4_reclaim_complete_done,
6573         .rpc_release = nfs4_free_reclaim_complete_data,
6574 };
6575
6576 /*
6577  * Issue a global reclaim complete.
6578  */
6579 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
6580                 struct rpc_cred *cred)
6581 {
6582         struct nfs4_reclaim_complete_data *calldata;
6583         struct rpc_task *task;
6584         struct rpc_message msg = {
6585                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6586                 .rpc_cred = cred,
6587         };
6588         struct rpc_task_setup task_setup_data = {
6589                 .rpc_client = clp->cl_rpcclient,
6590                 .rpc_message = &msg,
6591                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6592                 .flags = RPC_TASK_ASYNC,
6593         };
6594         int status = -ENOMEM;
6595
6596         dprintk("--> %s\n", __func__);
6597         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6598         if (calldata == NULL)
6599                 goto out;
6600         calldata->clp = clp;
6601         calldata->arg.one_fs = 0;
6602
6603         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6604         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6605         msg.rpc_argp = &calldata->arg;
6606         msg.rpc_resp = &calldata->res;
6607         task_setup_data.callback_data = calldata;
6608         task = rpc_run_task(&task_setup_data);
6609         if (IS_ERR(task)) {
6610                 status = PTR_ERR(task);
6611                 goto out;
6612         }
6613         status = nfs4_wait_for_completion_rpc_task(task);
6614         if (status == 0)
6615                 status = task->tk_status;
6616         rpc_put_task(task);
6617         return 0;
6618 out:
6619         dprintk("<-- %s status=%d\n", __func__, status);
6620         return status;
6621 }
6622
6623 static void
6624 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6625 {
6626         struct nfs4_layoutget *lgp = calldata;
6627         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6628         struct nfs4_session *session = nfs4_get_session(server);
6629
6630         dprintk("--> %s\n", __func__);
6631         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6632          * right now covering the LAYOUTGET we are about to send.
6633          * However, that is not so catastrophic, and there seems
6634          * to be no way to prevent it completely.
6635          */
6636         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6637                                 &lgp->res.seq_res, task))
6638                 return;
6639         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6640                                           NFS_I(lgp->args.inode)->layout,
6641                                           lgp->args.ctx->state)) {
6642                 rpc_exit(task, NFS4_OK);
6643         }
6644 }
6645
6646 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6647 {
6648         struct nfs4_layoutget *lgp = calldata;
6649         struct inode *inode = lgp->args.inode;
6650         struct nfs_server *server = NFS_SERVER(inode);
6651         struct pnfs_layout_hdr *lo;
6652         struct nfs4_state *state = NULL;
6653         unsigned long timeo, giveup;
6654
6655         dprintk("--> %s\n", __func__);
6656
6657         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6658                 goto out;
6659
6660         switch (task->tk_status) {
6661         case 0:
6662                 goto out;
6663         case -NFS4ERR_LAYOUTTRYLATER:
6664         case -NFS4ERR_RECALLCONFLICT:
6665                 timeo = rpc_get_timeout(task->tk_client);
6666                 giveup = lgp->args.timestamp + timeo;
6667                 if (time_after(giveup, jiffies))
6668                         task->tk_status = -NFS4ERR_DELAY;
6669                 break;
6670         case -NFS4ERR_EXPIRED:
6671         case -NFS4ERR_BAD_STATEID:
6672                 spin_lock(&inode->i_lock);
6673                 lo = NFS_I(inode)->layout;
6674                 if (!lo || list_empty(&lo->plh_segs)) {
6675                         spin_unlock(&inode->i_lock);
6676                         /* If the open stateid was bad, then recover it. */
6677                         state = lgp->args.ctx->state;
6678                 } else {
6679                         LIST_HEAD(head);
6680
6681                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6682                         spin_unlock(&inode->i_lock);
6683                         /* Mark the bad layout state as invalid, then
6684                          * retry using the open stateid. */
6685                         pnfs_free_lseg_list(&head);
6686                 }
6687         }
6688         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6689                 rpc_restart_call_prepare(task);
6690 out:
6691         dprintk("<-- %s\n", __func__);
6692 }
6693
6694 static size_t max_response_pages(struct nfs_server *server)
6695 {
6696         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6697         return nfs_page_array_len(0, max_resp_sz);
6698 }
6699
6700 static void nfs4_free_pages(struct page **pages, size_t size)
6701 {
6702         int i;
6703
6704         if (!pages)
6705                 return;
6706
6707         for (i = 0; i < size; i++) {
6708                 if (!pages[i])
6709                         break;
6710                 __free_page(pages[i]);
6711         }
6712         kfree(pages);
6713 }
6714
6715 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6716 {
6717         struct page **pages;
6718         int i;
6719
6720         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6721         if (!pages) {
6722                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6723                 return NULL;
6724         }
6725
6726         for (i = 0; i < size; i++) {
6727                 pages[i] = alloc_page(gfp_flags);
6728                 if (!pages[i]) {
6729                         dprintk("%s: failed to allocate page\n", __func__);
6730                         nfs4_free_pages(pages, size);
6731                         return NULL;
6732                 }
6733         }
6734
6735         return pages;
6736 }
6737
6738 static void nfs4_layoutget_release(void *calldata)
6739 {
6740         struct nfs4_layoutget *lgp = calldata;
6741         struct inode *inode = lgp->args.inode;
6742         struct nfs_server *server = NFS_SERVER(inode);
6743         size_t max_pages = max_response_pages(server);
6744
6745         dprintk("--> %s\n", __func__);
6746         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6747         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6748         put_nfs_open_context(lgp->args.ctx);
6749         kfree(calldata);
6750         dprintk("<-- %s\n", __func__);
6751 }
6752
6753 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6754         .rpc_call_prepare = nfs4_layoutget_prepare,
6755         .rpc_call_done = nfs4_layoutget_done,
6756         .rpc_release = nfs4_layoutget_release,
6757 };
6758
6759 struct pnfs_layout_segment *
6760 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6761 {
6762         struct inode *inode = lgp->args.inode;
6763         struct nfs_server *server = NFS_SERVER(inode);
6764         size_t max_pages = max_response_pages(server);
6765         struct rpc_task *task;
6766         struct rpc_message msg = {
6767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6768                 .rpc_argp = &lgp->args,
6769                 .rpc_resp = &lgp->res,
6770                 .rpc_cred = lgp->cred,
6771         };
6772         struct rpc_task_setup task_setup_data = {
6773                 .rpc_client = server->client,
6774                 .rpc_message = &msg,
6775                 .callback_ops = &nfs4_layoutget_call_ops,
6776                 .callback_data = lgp,
6777                 .flags = RPC_TASK_ASYNC,
6778         };
6779         struct pnfs_layout_segment *lseg = NULL;
6780         int status = 0;
6781
6782         dprintk("--> %s\n", __func__);
6783
6784         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6785         if (!lgp->args.layout.pages) {
6786                 nfs4_layoutget_release(lgp);
6787                 return ERR_PTR(-ENOMEM);
6788         }
6789         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6790         lgp->args.timestamp = jiffies;
6791
6792         lgp->res.layoutp = &lgp->args.layout;
6793         lgp->res.seq_res.sr_slot = NULL;
6794         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6795
6796         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
6797         pnfs_get_layout_hdr(NFS_I(inode)->layout);
6798
6799         task = rpc_run_task(&task_setup_data);
6800         if (IS_ERR(task))
6801                 return ERR_CAST(task);
6802         status = nfs4_wait_for_completion_rpc_task(task);
6803         if (status == 0)
6804                 status = task->tk_status;
6805         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
6806         if (status == 0 && lgp->res.layoutp->len)
6807                 lseg = pnfs_layout_process(lgp);
6808         rpc_put_task(task);
6809         dprintk("<-- %s status=%d\n", __func__, status);
6810         if (status)
6811                 return ERR_PTR(status);
6812         return lseg;
6813 }
6814
6815 static void
6816 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6817 {
6818         struct nfs4_layoutreturn *lrp = calldata;
6819
6820         dprintk("--> %s\n", __func__);
6821         nfs41_setup_sequence(lrp->clp->cl_session,
6822                         &lrp->args.seq_args,
6823                         &lrp->res.seq_res,
6824                         task);
6825 }
6826
6827 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6828 {
6829         struct nfs4_layoutreturn *lrp = calldata;
6830         struct nfs_server *server;
6831
6832         dprintk("--> %s\n", __func__);
6833
6834         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
6835                 return;
6836
6837         server = NFS_SERVER(lrp->args.inode);
6838         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6839                 rpc_restart_call_prepare(task);
6840                 return;
6841         }
6842         dprintk("<-- %s\n", __func__);
6843 }
6844
6845 static void nfs4_layoutreturn_release(void *calldata)
6846 {
6847         struct nfs4_layoutreturn *lrp = calldata;
6848         struct pnfs_layout_hdr *lo = lrp->args.layout;
6849
6850         dprintk("--> %s\n", __func__);
6851         spin_lock(&lo->plh_inode->i_lock);
6852         if (lrp->res.lrs_present)
6853                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6854         lo->plh_block_lgets--;
6855         spin_unlock(&lo->plh_inode->i_lock);
6856         pnfs_put_layout_hdr(lrp->args.layout);
6857         kfree(calldata);
6858         dprintk("<-- %s\n", __func__);
6859 }
6860
6861 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6862         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6863         .rpc_call_done = nfs4_layoutreturn_done,
6864         .rpc_release = nfs4_layoutreturn_release,
6865 };
6866
6867 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6868 {
6869         struct rpc_task *task;
6870         struct rpc_message msg = {
6871                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6872                 .rpc_argp = &lrp->args,
6873                 .rpc_resp = &lrp->res,
6874                 .rpc_cred = lrp->cred,
6875         };
6876         struct rpc_task_setup task_setup_data = {
6877                 .rpc_client = lrp->clp->cl_rpcclient,
6878                 .rpc_message = &msg,
6879                 .callback_ops = &nfs4_layoutreturn_call_ops,
6880                 .callback_data = lrp,
6881         };
6882         int status;
6883
6884         dprintk("--> %s\n", __func__);
6885         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6886         task = rpc_run_task(&task_setup_data);
6887         if (IS_ERR(task))
6888                 return PTR_ERR(task);
6889         status = task->tk_status;
6890         dprintk("<-- %s status=%d\n", __func__, status);
6891         rpc_put_task(task);
6892         return status;
6893 }
6894
6895 /*
6896  * Retrieve the list of Data Server devices from the MDS.
6897  */
6898 static int _nfs4_getdevicelist(struct nfs_server *server,
6899                                     const struct nfs_fh *fh,
6900                                     struct pnfs_devicelist *devlist)
6901 {
6902         struct nfs4_getdevicelist_args args = {
6903                 .fh = fh,
6904                 .layoutclass = server->pnfs_curr_ld->id,
6905         };
6906         struct nfs4_getdevicelist_res res = {
6907                 .devlist = devlist,
6908         };
6909         struct rpc_message msg = {
6910                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6911                 .rpc_argp = &args,
6912                 .rpc_resp = &res,
6913         };
6914         int status;
6915
6916         dprintk("--> %s\n", __func__);
6917         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6918                                 &res.seq_res, 0);
6919         dprintk("<-- %s status=%d\n", __func__, status);
6920         return status;
6921 }
6922
6923 int nfs4_proc_getdevicelist(struct nfs_server *server,
6924                             const struct nfs_fh *fh,
6925                             struct pnfs_devicelist *devlist)
6926 {
6927         struct nfs4_exception exception = { };
6928         int err;
6929
6930         do {
6931                 err = nfs4_handle_exception(server,
6932                                 _nfs4_getdevicelist(server, fh, devlist),
6933                                 &exception);
6934         } while (exception.retry);
6935
6936         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6937                 err, devlist->num_devs);
6938
6939         return err;
6940 }
6941 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6942
6943 static int
6944 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
6945                 struct pnfs_device *pdev,
6946                 struct rpc_cred *cred)
6947 {
6948         struct nfs4_getdeviceinfo_args args = {
6949                 .pdev = pdev,
6950         };
6951         struct nfs4_getdeviceinfo_res res = {
6952                 .pdev = pdev,
6953         };
6954         struct rpc_message msg = {
6955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6956                 .rpc_argp = &args,
6957                 .rpc_resp = &res,
6958                 .rpc_cred = cred,
6959         };
6960         int status;
6961
6962         dprintk("--> %s\n", __func__);
6963         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6964         dprintk("<-- %s status=%d\n", __func__, status);
6965
6966         return status;
6967 }
6968
6969 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
6970                 struct pnfs_device *pdev,
6971                 struct rpc_cred *cred)
6972 {
6973         struct nfs4_exception exception = { };
6974         int err;
6975
6976         do {
6977                 err = nfs4_handle_exception(server,
6978                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
6979                                         &exception);
6980         } while (exception.retry);
6981         return err;
6982 }
6983 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6984
6985 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6986 {
6987         struct nfs4_layoutcommit_data *data = calldata;
6988         struct nfs_server *server = NFS_SERVER(data->args.inode);
6989         struct nfs4_session *session = nfs4_get_session(server);
6990
6991         nfs41_setup_sequence(session,
6992                         &data->args.seq_args,
6993                         &data->res.seq_res,
6994                         task);
6995 }
6996
6997 static void
6998 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6999 {
7000         struct nfs4_layoutcommit_data *data = calldata;
7001         struct nfs_server *server = NFS_SERVER(data->args.inode);
7002
7003         if (!nfs41_sequence_done(task, &data->res.seq_res))
7004                 return;
7005
7006         switch (task->tk_status) { /* Just ignore these failures */
7007         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7008         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7009         case -NFS4ERR_BADLAYOUT:     /* no layout */
7010         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7011                 task->tk_status = 0;
7012                 break;
7013         case 0:
7014                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7015                                                    data->res.fattr);
7016                 break;
7017         default:
7018                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7019                         rpc_restart_call_prepare(task);
7020                         return;
7021                 }
7022         }
7023 }
7024
7025 static void nfs4_layoutcommit_release(void *calldata)
7026 {
7027         struct nfs4_layoutcommit_data *data = calldata;
7028
7029         pnfs_cleanup_layoutcommit(data);
7030         put_rpccred(data->cred);
7031         kfree(data);
7032 }
7033
7034 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7035         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7036         .rpc_call_done = nfs4_layoutcommit_done,
7037         .rpc_release = nfs4_layoutcommit_release,
7038 };
7039
7040 int
7041 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7042 {
7043         struct rpc_message msg = {
7044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7045                 .rpc_argp = &data->args,
7046                 .rpc_resp = &data->res,
7047                 .rpc_cred = data->cred,
7048         };
7049         struct rpc_task_setup task_setup_data = {
7050                 .task = &data->task,
7051                 .rpc_client = NFS_CLIENT(data->args.inode),
7052                 .rpc_message = &msg,
7053                 .callback_ops = &nfs4_layoutcommit_ops,
7054                 .callback_data = data,
7055                 .flags = RPC_TASK_ASYNC,
7056         };
7057         struct rpc_task *task;
7058         int status = 0;
7059
7060         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7061                 "lbw: %llu inode %lu\n",
7062                 data->task.tk_pid, sync,
7063                 data->args.lastbytewritten,
7064                 data->args.inode->i_ino);
7065
7066         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7067         task = rpc_run_task(&task_setup_data);
7068         if (IS_ERR(task))
7069                 return PTR_ERR(task);
7070         if (sync == false)
7071                 goto out;
7072         status = nfs4_wait_for_completion_rpc_task(task);
7073         if (status != 0)
7074                 goto out;
7075         status = task->tk_status;
7076 out:
7077         dprintk("%s: status %d\n", __func__, status);
7078         rpc_put_task(task);
7079         return status;
7080 }
7081
7082 static int
7083 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7084                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7085 {
7086         struct nfs41_secinfo_no_name_args args = {
7087                 .style = SECINFO_STYLE_CURRENT_FH,
7088         };
7089         struct nfs4_secinfo_res res = {
7090                 .flavors = flavors,
7091         };
7092         struct rpc_message msg = {
7093                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7094                 .rpc_argp = &args,
7095                 .rpc_resp = &res,
7096         };
7097         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7098 }
7099
7100 static int
7101 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7102                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7103 {
7104         struct nfs4_exception exception = { };
7105         int err;
7106         do {
7107                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7108                 switch (err) {
7109                 case 0:
7110                 case -NFS4ERR_WRONGSEC:
7111                 case -NFS4ERR_NOTSUPP:
7112                         goto out;
7113                 default:
7114                         err = nfs4_handle_exception(server, err, &exception);
7115                 }
7116         } while (exception.retry);
7117 out:
7118         return err;
7119 }
7120
7121 static int
7122 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7123                     struct nfs_fsinfo *info)
7124 {
7125         int err;
7126         struct page *page;
7127         rpc_authflavor_t flavor;
7128         struct nfs4_secinfo_flavors *flavors;
7129
7130         page = alloc_page(GFP_KERNEL);
7131         if (!page) {
7132                 err = -ENOMEM;
7133                 goto out;
7134         }
7135
7136         flavors = page_address(page);
7137         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7138
7139         /*
7140          * Fall back on "guess and check" method if
7141          * the server doesn't support SECINFO_NO_NAME
7142          */
7143         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7144                 err = nfs4_find_root_sec(server, fhandle, info);
7145                 goto out_freepage;
7146         }
7147         if (err)
7148                 goto out_freepage;
7149
7150         flavor = nfs_find_best_sec(flavors);
7151         if (err == 0)
7152                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
7153
7154 out_freepage:
7155         put_page(page);
7156         if (err == -EACCES)
7157                 return -EPERM;
7158 out:
7159         return err;
7160 }
7161
7162 static int _nfs41_test_stateid(struct nfs_server *server,
7163                 nfs4_stateid *stateid,
7164                 struct rpc_cred *cred)
7165 {
7166         int status;
7167         struct nfs41_test_stateid_args args = {
7168                 .stateid = stateid,
7169         };
7170         struct nfs41_test_stateid_res res;
7171         struct rpc_message msg = {
7172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7173                 .rpc_argp = &args,
7174                 .rpc_resp = &res,
7175                 .rpc_cred = cred,
7176         };
7177
7178         dprintk("NFS call  test_stateid %p\n", stateid);
7179         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
7180         nfs4_set_sequence_privileged(&args.seq_args);
7181         status = nfs4_call_sync_sequence(server->client, server, &msg,
7182                         &args.seq_args, &res.seq_res);
7183         if (status != NFS_OK) {
7184                 dprintk("NFS reply test_stateid: failed, %d\n", status);
7185                 return status;
7186         }
7187         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7188         return -res.status;
7189 }
7190
7191 /**
7192  * nfs41_test_stateid - perform a TEST_STATEID operation
7193  *
7194  * @server: server / transport on which to perform the operation
7195  * @stateid: state ID to test
7196  * @cred: credential
7197  *
7198  * Returns NFS_OK if the server recognizes that "stateid" is valid.
7199  * Otherwise a negative NFS4ERR value is returned if the operation
7200  * failed or the state ID is not currently valid.
7201  */
7202 static int nfs41_test_stateid(struct nfs_server *server,
7203                 nfs4_stateid *stateid,
7204                 struct rpc_cred *cred)
7205 {
7206         struct nfs4_exception exception = { };
7207         int err;
7208         do {
7209                 err = _nfs41_test_stateid(server, stateid, cred);
7210                 if (err != -NFS4ERR_DELAY)
7211                         break;
7212                 nfs4_handle_exception(server, err, &exception);
7213         } while (exception.retry);
7214         return err;
7215 }
7216
7217 struct nfs_free_stateid_data {
7218         struct nfs_server *server;
7219         struct nfs41_free_stateid_args args;
7220         struct nfs41_free_stateid_res res;
7221 };
7222
7223 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
7224 {
7225         struct nfs_free_stateid_data *data = calldata;
7226         nfs41_setup_sequence(nfs4_get_session(data->server),
7227                         &data->args.seq_args,
7228                         &data->res.seq_res,
7229                         task);
7230 }
7231
7232 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
7233 {
7234         struct nfs_free_stateid_data *data = calldata;
7235
7236         nfs41_sequence_done(task, &data->res.seq_res);
7237
7238         switch (task->tk_status) {
7239         case -NFS4ERR_DELAY:
7240                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
7241                         rpc_restart_call_prepare(task);
7242         }
7243 }
7244
7245 static void nfs41_free_stateid_release(void *calldata)
7246 {
7247         kfree(calldata);
7248 }
7249
7250 const struct rpc_call_ops nfs41_free_stateid_ops = {
7251         .rpc_call_prepare = nfs41_free_stateid_prepare,
7252         .rpc_call_done = nfs41_free_stateid_done,
7253         .rpc_release = nfs41_free_stateid_release,
7254 };
7255
7256 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
7257                 nfs4_stateid *stateid,
7258                 struct rpc_cred *cred,
7259                 bool privileged)
7260 {
7261         struct rpc_message msg = {
7262                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7263                 .rpc_cred = cred,
7264         };
7265         struct rpc_task_setup task_setup = {
7266                 .rpc_client = server->client,
7267                 .rpc_message = &msg,
7268                 .callback_ops = &nfs41_free_stateid_ops,
7269                 .flags = RPC_TASK_ASYNC,
7270         };
7271         struct nfs_free_stateid_data *data;
7272
7273         dprintk("NFS call  free_stateid %p\n", stateid);
7274         data = kmalloc(sizeof(*data), GFP_NOFS);
7275         if (!data)
7276                 return ERR_PTR(-ENOMEM);
7277         data->server = server;
7278         nfs4_stateid_copy(&data->args.stateid, stateid);
7279
7280         task_setup.callback_data = data;
7281
7282         msg.rpc_argp = &data->args;
7283         msg.rpc_resp = &data->res;
7284         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
7285         if (privileged)
7286                 nfs4_set_sequence_privileged(&data->args.seq_args);
7287
7288         return rpc_run_task(&task_setup);
7289 }
7290
7291 /**
7292  * nfs41_free_stateid - perform a FREE_STATEID operation
7293  *
7294  * @server: server / transport on which to perform the operation
7295  * @stateid: state ID to release
7296  * @cred: credential
7297  *
7298  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7299  * negative NFS4ERR value is returned.
7300  */
7301 static int nfs41_free_stateid(struct nfs_server *server,
7302                 nfs4_stateid *stateid,
7303                 struct rpc_cred *cred)
7304 {
7305         struct rpc_task *task;
7306         int ret;
7307
7308         task = _nfs41_free_stateid(server, stateid, cred, true);
7309         if (IS_ERR(task))
7310                 return PTR_ERR(task);
7311         ret = rpc_wait_for_completion_task(task);
7312         if (!ret)
7313                 ret = task->tk_status;
7314         rpc_put_task(task);
7315         return ret;
7316 }
7317
7318 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
7319 {
7320         struct rpc_task *task;
7321         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
7322
7323         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
7324         nfs4_free_lock_state(server, lsp);
7325         if (IS_ERR(task))
7326                 return PTR_ERR(task);
7327         rpc_put_task(task);
7328         return 0;
7329 }
7330
7331 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7332                 const nfs4_stateid *s2)
7333 {
7334         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7335                 return false;
7336
7337         if (s1->seqid == s2->seqid)
7338                 return true;
7339         if (s1->seqid == 0 || s2->seqid == 0)
7340                 return true;
7341
7342         return false;
7343 }
7344
7345 #endif /* CONFIG_NFS_V4_1 */
7346
7347 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7348                 const nfs4_stateid *s2)
7349 {
7350         return nfs4_stateid_match(s1, s2);
7351 }
7352
7353
7354 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7355         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7356         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7357         .recover_open   = nfs4_open_reclaim,
7358         .recover_lock   = nfs4_lock_reclaim,
7359         .establish_clid = nfs4_init_clientid,
7360         .get_clid_cred  = nfs4_get_setclientid_cred,
7361         .detect_trunking = nfs40_discover_server_trunking,
7362 };
7363
7364 #if defined(CONFIG_NFS_V4_1)
7365 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7366         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7367         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7368         .recover_open   = nfs4_open_reclaim,
7369         .recover_lock   = nfs4_lock_reclaim,
7370         .establish_clid = nfs41_init_clientid,
7371         .get_clid_cred  = nfs4_get_exchange_id_cred,
7372         .reclaim_complete = nfs41_proc_reclaim_complete,
7373         .detect_trunking = nfs41_discover_server_trunking,
7374 };
7375 #endif /* CONFIG_NFS_V4_1 */
7376
7377 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7378         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7379         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7380         .recover_open   = nfs4_open_expired,
7381         .recover_lock   = nfs4_lock_expired,
7382         .establish_clid = nfs4_init_clientid,
7383         .get_clid_cred  = nfs4_get_setclientid_cred,
7384 };
7385
7386 #if defined(CONFIG_NFS_V4_1)
7387 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7388         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7389         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7390         .recover_open   = nfs41_open_expired,
7391         .recover_lock   = nfs41_lock_expired,
7392         .establish_clid = nfs41_init_clientid,
7393         .get_clid_cred  = nfs4_get_exchange_id_cred,
7394 };
7395 #endif /* CONFIG_NFS_V4_1 */
7396
7397 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7398         .sched_state_renewal = nfs4_proc_async_renew,
7399         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7400         .renew_lease = nfs4_proc_renew,
7401 };
7402
7403 #if defined(CONFIG_NFS_V4_1)
7404 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7405         .sched_state_renewal = nfs41_proc_async_sequence,
7406         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7407         .renew_lease = nfs4_proc_sequence,
7408 };
7409 #endif
7410
7411 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7412         .minor_version = 0,
7413         .init_caps = NFS_CAP_READDIRPLUS
7414                 | NFS_CAP_ATOMIC_OPEN
7415                 | NFS_CAP_CHANGE_ATTR
7416                 | NFS_CAP_POSIX_LOCK,
7417         .call_sync = _nfs4_call_sync,
7418         .match_stateid = nfs4_match_stateid,
7419         .find_root_sec = nfs4_find_root_sec,
7420         .free_lock_state = nfs4_release_lockowner,
7421         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7422         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7423         .state_renewal_ops = &nfs40_state_renewal_ops,
7424 };
7425
7426 #if defined(CONFIG_NFS_V4_1)
7427 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7428         .minor_version = 1,
7429         .init_caps = NFS_CAP_READDIRPLUS
7430                 | NFS_CAP_ATOMIC_OPEN
7431                 | NFS_CAP_CHANGE_ATTR
7432                 | NFS_CAP_POSIX_LOCK
7433                 | NFS_CAP_STATEID_NFSV41
7434                 | NFS_CAP_ATOMIC_OPEN_V1,
7435         .call_sync = nfs4_call_sync_sequence,
7436         .match_stateid = nfs41_match_stateid,
7437         .find_root_sec = nfs41_find_root_sec,
7438         .free_lock_state = nfs41_free_lock_state,
7439         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7440         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7441         .state_renewal_ops = &nfs41_state_renewal_ops,
7442 };
7443 #endif
7444
7445 #if defined(CONFIG_NFS_V4_2)
7446 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
7447         .minor_version = 2,
7448         .init_caps = NFS_CAP_READDIRPLUS
7449                 | NFS_CAP_ATOMIC_OPEN
7450                 | NFS_CAP_CHANGE_ATTR
7451                 | NFS_CAP_POSIX_LOCK
7452                 | NFS_CAP_STATEID_NFSV41
7453                 | NFS_CAP_ATOMIC_OPEN_V1,
7454         .call_sync = nfs4_call_sync_sequence,
7455         .match_stateid = nfs41_match_stateid,
7456         .find_root_sec = nfs41_find_root_sec,
7457         .free_lock_state = nfs41_free_lock_state,
7458         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7459         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7460         .state_renewal_ops = &nfs41_state_renewal_ops,
7461 };
7462 #endif
7463
7464 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7465         [0] = &nfs_v4_0_minor_ops,
7466 #if defined(CONFIG_NFS_V4_1)
7467         [1] = &nfs_v4_1_minor_ops,
7468 #endif
7469 #if defined(CONFIG_NFS_V4_2)
7470         [2] = &nfs_v4_2_minor_ops,
7471 #endif
7472 };
7473
7474 const struct inode_operations nfs4_dir_inode_operations = {
7475         .create         = nfs_create,
7476         .lookup         = nfs_lookup,
7477         .atomic_open    = nfs_atomic_open,
7478         .link           = nfs_link,
7479         .unlink         = nfs_unlink,
7480         .symlink        = nfs_symlink,
7481         .mkdir          = nfs_mkdir,
7482         .rmdir          = nfs_rmdir,
7483         .mknod          = nfs_mknod,
7484         .rename         = nfs_rename,
7485         .permission     = nfs_permission,
7486         .getattr        = nfs_getattr,
7487         .setattr        = nfs_setattr,
7488         .getxattr       = generic_getxattr,
7489         .setxattr       = generic_setxattr,
7490         .listxattr      = generic_listxattr,
7491         .removexattr    = generic_removexattr,
7492 };
7493
7494 static const struct inode_operations nfs4_file_inode_operations = {
7495         .permission     = nfs_permission,
7496         .getattr        = nfs_getattr,
7497         .setattr        = nfs_setattr,
7498         .getxattr       = generic_getxattr,
7499         .setxattr       = generic_setxattr,
7500         .listxattr      = generic_listxattr,
7501         .removexattr    = generic_removexattr,
7502 };
7503
7504 const struct nfs_rpc_ops nfs_v4_clientops = {
7505         .version        = 4,                    /* protocol version */
7506         .dentry_ops     = &nfs4_dentry_operations,
7507         .dir_inode_ops  = &nfs4_dir_inode_operations,
7508         .file_inode_ops = &nfs4_file_inode_operations,
7509         .file_ops       = &nfs4_file_operations,
7510         .getroot        = nfs4_proc_get_root,
7511         .submount       = nfs4_submount,
7512         .try_mount      = nfs4_try_mount,
7513         .getattr        = nfs4_proc_getattr,
7514         .setattr        = nfs4_proc_setattr,
7515         .lookup         = nfs4_proc_lookup,
7516         .access         = nfs4_proc_access,
7517         .readlink       = nfs4_proc_readlink,
7518         .create         = nfs4_proc_create,
7519         .remove         = nfs4_proc_remove,
7520         .unlink_setup   = nfs4_proc_unlink_setup,
7521         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7522         .unlink_done    = nfs4_proc_unlink_done,
7523         .rename         = nfs4_proc_rename,
7524         .rename_setup   = nfs4_proc_rename_setup,
7525         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7526         .rename_done    = nfs4_proc_rename_done,
7527         .link           = nfs4_proc_link,
7528         .symlink        = nfs4_proc_symlink,
7529         .mkdir          = nfs4_proc_mkdir,
7530         .rmdir          = nfs4_proc_remove,
7531         .readdir        = nfs4_proc_readdir,
7532         .mknod          = nfs4_proc_mknod,
7533         .statfs         = nfs4_proc_statfs,
7534         .fsinfo         = nfs4_proc_fsinfo,
7535         .pathconf       = nfs4_proc_pathconf,
7536         .set_capabilities = nfs4_server_capabilities,
7537         .decode_dirent  = nfs4_decode_dirent,
7538         .read_setup     = nfs4_proc_read_setup,
7539         .read_pageio_init = pnfs_pageio_init_read,
7540         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7541         .read_done      = nfs4_read_done,
7542         .write_setup    = nfs4_proc_write_setup,
7543         .write_pageio_init = pnfs_pageio_init_write,
7544         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7545         .write_done     = nfs4_write_done,
7546         .commit_setup   = nfs4_proc_commit_setup,
7547         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7548         .commit_done    = nfs4_commit_done,
7549         .lock           = nfs4_proc_lock,
7550         .clear_acl_cache = nfs4_zap_acl_attr,
7551         .close_context  = nfs4_close_context,
7552         .open_context   = nfs4_atomic_open,
7553         .have_delegation = nfs4_have_delegation,
7554         .return_delegation = nfs4_inode_return_delegation,
7555         .alloc_client   = nfs4_alloc_client,
7556         .init_client    = nfs4_init_client,
7557         .free_client    = nfs4_free_client,
7558         .create_server  = nfs4_create_server,
7559         .clone_server   = nfs_clone_server,
7560 };
7561
7562 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7563         .prefix = XATTR_NAME_NFSV4_ACL,
7564         .list   = nfs4_xattr_list_nfs4_acl,
7565         .get    = nfs4_xattr_get_nfs4_acl,
7566         .set    = nfs4_xattr_set_nfs4_acl,
7567 };
7568
7569 const struct xattr_handler *nfs4_xattr_handlers[] = {
7570         &nfs4_xattr_nfs4_acl_handler,
7571 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7572         &nfs4_xattr_nfs4_label_handler,
7573 #endif
7574         NULL
7575 };
7576
7577 /*
7578  * Local variables:
7579  *  c-basic-offset: 8
7580  * End:
7581  */