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 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         if (NFS_SERVER(dir)->nfs_client->cl_minorversion < 2)
 109                 return NULL;
 110
 111         err = security_dentry_init_security(dentry, sattr->ia_mode,
 112                                 &dentry->d_name, (void **)&label->label, &label->len);
 113         if (err == 0)
 114                 return label;
 115
 116         return NULL;
 117 }
 118 static inline void
 119 nfs4_label_release_security(struct nfs4_label *label)
 120 {
 121         if (label)
 122                 security_release_secctx(label->label, label->len);
 123 }
 124 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 125 {
 126         if (label)
 127                 return server->attr_bitmask;
 128
 129         return server->attr_bitmask_nl;
 130 }
 131 #else
 132 static inline struct nfs4_label *
 133 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 134         struct iattr *sattr, struct nfs4_label *l)
 135 { return NULL; }
 136 static inline void
 137 nfs4_label_release_security(struct nfs4_label *label)
 138 { return; }
 139 static inline u32 *
 140 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 141 { return server->attr_bitmask; }
 142 #endif
 143
 144 /* Prevent leaks of NFSv4 errors into userland */
 145 static int nfs4_map_errors(int err)
 146 {
 147         if (err >= -1000)
 148                 return err;
 149         switch (err) {
 150         case -NFS4ERR_RESOURCE:
 151         case -NFS4ERR_LAYOUTTRYLATER:
 152         case -NFS4ERR_RECALLCONFLICT:
 153                 return -EREMOTEIO;
 154         case -NFS4ERR_WRONGSEC:
 155                 return -EPERM;
 156         case -NFS4ERR_BADOWNER:
 157         case -NFS4ERR_BADNAME:
 158                 return -EINVAL;
 159         case -NFS4ERR_SHARE_DENIED:
 160                 return -EACCES;
 161         case -NFS4ERR_MINOR_VERS_MISMATCH:
 162                 return -EPROTONOSUPPORT;
 163         case -NFS4ERR_ACCESS:
 164                 return -EACCES;
 165         case -NFS4ERR_FILE_OPEN:
 166                 return -EBUSY;
 167         default:
 168                 dprintk("%s could not handle NFSv4 error %d\n",
 169                                 __func__, -err);
 170                 break;
 171         }
 172         return -EIO;
 173 }
 174
 175 /*
 176  * This is our standard bitmap for GETATTR requests.
 177  */
 178 const u32 nfs4_fattr_bitmap[3] = {
 179         FATTR4_WORD0_TYPE
 180         | FATTR4_WORD0_CHANGE
 181         | FATTR4_WORD0_SIZE
 182         | FATTR4_WORD0_FSID
 183         | FATTR4_WORD0_FILEID,
 184         FATTR4_WORD1_MODE
 185         | FATTR4_WORD1_NUMLINKS
 186         | FATTR4_WORD1_OWNER
 187         | FATTR4_WORD1_OWNER_GROUP
 188         | FATTR4_WORD1_RAWDEV
 189         | FATTR4_WORD1_SPACE_USED
 190         | FATTR4_WORD1_TIME_ACCESS
 191         | FATTR4_WORD1_TIME_METADATA
 192         | FATTR4_WORD1_TIME_MODIFY,
 193 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 194         FATTR4_WORD2_SECURITY_LABEL
 195 #endif
 196 };
 197
 198 static const u32 nfs4_pnfs_open_bitmap[3] = {
 199         FATTR4_WORD0_TYPE
 200         | FATTR4_WORD0_CHANGE
 201         | FATTR4_WORD0_SIZE
 202         | FATTR4_WORD0_FSID
 203         | FATTR4_WORD0_FILEID,
 204         FATTR4_WORD1_MODE
 205         | FATTR4_WORD1_NUMLINKS
 206         | FATTR4_WORD1_OWNER
 207         | FATTR4_WORD1_OWNER_GROUP
 208         | FATTR4_WORD1_RAWDEV
 209         | FATTR4_WORD1_SPACE_USED
 210         | FATTR4_WORD1_TIME_ACCESS
 211         | FATTR4_WORD1_TIME_METADATA
 212         | FATTR4_WORD1_TIME_MODIFY,
 213         FATTR4_WORD2_MDSTHRESHOLD
 214 };
 215
 216 static const u32 nfs4_open_noattr_bitmap[3] = {
 217         FATTR4_WORD0_TYPE
 218         | FATTR4_WORD0_CHANGE
 219         | FATTR4_WORD0_FILEID,
 220 };
 221
 222 const u32 nfs4_statfs_bitmap[3] = {
 223         FATTR4_WORD0_FILES_AVAIL
 224         | FATTR4_WORD0_FILES_FREE
 225         | FATTR4_WORD0_FILES_TOTAL,
 226         FATTR4_WORD1_SPACE_AVAIL
 227         | FATTR4_WORD1_SPACE_FREE
 228         | FATTR4_WORD1_SPACE_TOTAL
 229 };
 230
 231 const u32 nfs4_pathconf_bitmap[3] = {
 232         FATTR4_WORD0_MAXLINK
 233         | FATTR4_WORD0_MAXNAME,
 234         0
 235 };
 236
 237 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 238                         | FATTR4_WORD0_MAXREAD
 239                         | FATTR4_WORD0_MAXWRITE
 240                         | FATTR4_WORD0_LEASE_TIME,
 241                         FATTR4_WORD1_TIME_DELTA
 242                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 243                         FATTR4_WORD2_LAYOUT_BLKSIZE
 244 };
 245
 246 const u32 nfs4_fs_locations_bitmap[3] = {
 247         FATTR4_WORD0_TYPE
 248         | FATTR4_WORD0_CHANGE
 249         | FATTR4_WORD0_SIZE
 250         | FATTR4_WORD0_FSID
 251         | FATTR4_WORD0_FILEID
 252         | FATTR4_WORD0_FS_LOCATIONS,
 253         FATTR4_WORD1_MODE
 254         | FATTR4_WORD1_NUMLINKS
 255         | FATTR4_WORD1_OWNER
 256         | FATTR4_WORD1_OWNER_GROUP
 257         | FATTR4_WORD1_RAWDEV
 258         | FATTR4_WORD1_SPACE_USED
 259         | FATTR4_WORD1_TIME_ACCESS
 260         | FATTR4_WORD1_TIME_METADATA
 261         | FATTR4_WORD1_TIME_MODIFY
 262         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 263 };
 264
 265 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 266                 struct nfs4_readdir_arg *readdir)
 267 {
 268         __be32 *start, *p;
 269
 270         if (cookie > 2) {
 271                 readdir->cookie = cookie;
 272                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 273                 return;
 274         }
 275
 276         readdir->cookie = 0;
 277         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 278         if (cookie == 2)
 279                 return;
 280
 281         /*
 282          * NFSv4 servers do not return entries for '.' and '..'
 283          * Therefore, we fake these entries here.  We let '.'
 284          * have cookie 0 and '..' have cookie 1.  Note that
 285          * when talking to the server, we always send cookie 0
 286          * instead of 1 or 2.
 287          */
 288         start = p = kmap_atomic(*readdir->pages);
 289
 290         if (cookie == 0) {
 291                 *p++ = xdr_one;                                  /* next */
 292                 *p++ = xdr_zero;                   /* cookie, first word */
 293                 *p++ = xdr_one;                   /* cookie, second word */
 294                 *p++ = xdr_one;                             /* entry len */
 295                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 296                 p++;
 297                 *p++ = xdr_one;                         /* bitmap length */
 298                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 299                 *p++ = htonl(8);              /* attribute buffer length */
 300                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 301         }
 302
 303         *p++ = xdr_one;                                  /* next */
 304         *p++ = xdr_zero;                   /* cookie, first word */
 305         *p++ = xdr_two;                   /* cookie, second word */
 306         *p++ = xdr_two;                             /* entry len */
 307         memcpy(p, "..\0\0", 4);                         /* entry */
 308         p++;
 309         *p++ = xdr_one;                         /* bitmap length */
 310         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 311         *p++ = htonl(8);              /* attribute buffer length */
 312         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 313
 314         readdir->pgbase = (char *)p - (char *)start;
 315         readdir->count -= readdir->pgbase;
 316         kunmap_atomic(start);
 317 }
 318
 319 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 320 {
 321         int res = 0;
 322
 323         might_sleep();
 324
 325         if (*timeout <= 0)
 326                 *timeout = NFS4_POLL_RETRY_MIN;
 327         if (*timeout > NFS4_POLL_RETRY_MAX)
 328                 *timeout = NFS4_POLL_RETRY_MAX;
 329         freezable_schedule_timeout_killable_unsafe(*timeout);
 330         if (fatal_signal_pending(current))
 331                 res = -ERESTARTSYS;
 332         *timeout <<= 1;
 333         return res;
 334 }
 335
 336 /* This is the error handling routine for processes that are allowed
 337  * to sleep.
 338  */
 339 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 340 {
 341         struct nfs_client *clp = server->nfs_client;
 342         struct nfs4_state *state = exception->state;
 343         struct inode *inode = exception->inode;
 344         int ret = errorcode;
 345
 346         exception->retry = 0;
 347         switch(errorcode) {
 348                 case 0:
 349                         return 0;
 350                 case -NFS4ERR_OPENMODE:
 351                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 352                                 nfs4_inode_return_delegation(inode);
 353                                 exception->retry = 1;
 354                                 return 0;
 355                         }
 356                         if (state == NULL)
 357                                 break;
 358                         ret = nfs4_schedule_stateid_recovery(server, state);
 359                         if (ret < 0)
 360                                 break;
 361                         goto wait_on_recovery;
 362                 case -NFS4ERR_DELEG_REVOKED:
 363                 case -NFS4ERR_ADMIN_REVOKED:
 364                 case -NFS4ERR_BAD_STATEID:
 365                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 366                                 nfs_remove_bad_delegation(inode);
 367                                 exception->retry = 1;
 368                                 break;
 369                         }
 370                         if (state == NULL)
 371                                 break;
 372                         ret = nfs4_schedule_stateid_recovery(server, state);
 373                         if (ret < 0)
 374                                 break;
 375                         goto wait_on_recovery;
 376                 case -NFS4ERR_EXPIRED:
 377                         if (state != NULL) {
 378                                 ret = nfs4_schedule_stateid_recovery(server, state);
 379                                 if (ret < 0)
 380                                         break;
 381                         }
 382                 case -NFS4ERR_STALE_STATEID:
 383                 case -NFS4ERR_STALE_CLIENTID:
 384                         nfs4_schedule_lease_recovery(clp);
 385                         goto wait_on_recovery;
 386 #if defined(CONFIG_NFS_V4_1)
 387                 case -NFS4ERR_BADSESSION:
 388                 case -NFS4ERR_BADSLOT:
 389                 case -NFS4ERR_BAD_HIGH_SLOT:
 390                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 391                 case -NFS4ERR_DEADSESSION:
 392                 case -NFS4ERR_SEQ_FALSE_RETRY:
 393                 case -NFS4ERR_SEQ_MISORDERED:
 394                         dprintk("%s ERROR: %d Reset session\n", __func__,
 395                                 errorcode);
 396                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 397                         goto wait_on_recovery;
 398 #endif /* defined(CONFIG_NFS_V4_1) */
 399                 case -NFS4ERR_FILE_OPEN:
 400                         if (exception->timeout > HZ) {
 401                                 /* We have retried a decent amount, time to
 402                                  * fail
 403                                  */
 404                                 ret = -EBUSY;
 405                                 break;
 406                         }
 407                 case -NFS4ERR_GRACE:
 408                 case -NFS4ERR_DELAY:
 409                         ret = nfs4_delay(server->client, &exception->timeout);
 410                         if (ret != 0)
 411                                 break;
 412                 case -NFS4ERR_RETRY_UNCACHED_REP:
 413                 case -NFS4ERR_OLD_STATEID:
 414                         exception->retry = 1;
 415                         break;
 416                 case -NFS4ERR_BADOWNER:
 417                         /* The following works around a Linux server bug! */
 418                 case -NFS4ERR_BADNAME:
 419                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 420                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 421                                 exception->retry = 1;
 422                                 printk(KERN_WARNING "NFS: v4 server %s "
 423                                                 "does not accept raw "
 424                                                 "uid/gids. "
 425                                                 "Reenabling the idmapper.\n",
 426                                                 server->nfs_client->cl_hostname);
 427                         }
 428         }
 429         /* We failed to handle the error */
 430         return nfs4_map_errors(ret);
 431 wait_on_recovery:
 432         ret = nfs4_wait_clnt_recover(clp);
 433         if (ret == 0)
 434                 exception->retry = 1;
 435         return ret;
 436 }
 437
 438 /*
 439  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 440  * or 'false' otherwise.
 441  */
 442 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 443 {
 444         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 445
 446         if (flavor == RPC_AUTH_GSS_KRB5I ||
 447             flavor == RPC_AUTH_GSS_KRB5P)
 448                 return true;
 449
 450         return false;
 451 }
 452
 453 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 454 {
 455         spin_lock(&clp->cl_lock);
 456         if (time_before(clp->cl_last_renewal,timestamp))
 457                 clp->cl_last_renewal = timestamp;
 458         spin_unlock(&clp->cl_lock);
 459 }
 460
 461 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 462 {
 463         do_renew_lease(server->nfs_client, timestamp);
 464 }
 465
 466 struct nfs4_call_sync_data {
 467         const struct nfs_server *seq_server;
 468         struct nfs4_sequence_args *seq_args;
 469         struct nfs4_sequence_res *seq_res;
 470 };
 471
 472 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 473                                struct nfs4_sequence_res *res, int cache_reply)
 474 {
 475         args->sa_slot = NULL;
 476         args->sa_cache_this = cache_reply;
 477         args->sa_privileged = 0;
 478
 479         res->sr_slot = NULL;
 480 }
 481
 482 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 483 {
 484         args->sa_privileged = 1;
 485 }
 486
 487 static int nfs40_setup_sequence(const struct nfs_server *server,
 488                                 struct nfs4_sequence_args *args,
 489                                 struct nfs4_sequence_res *res,
 490                                 struct rpc_task *task)
 491 {
 492         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 493         struct nfs4_slot *slot;
 494
 495         /* slot already allocated? */
 496         if (res->sr_slot != NULL)
 497                 goto out_start;
 498
 499         spin_lock(&tbl->slot_tbl_lock);
 500         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 501                 goto out_sleep;
 502
 503         slot = nfs4_alloc_slot(tbl);
 504         if (IS_ERR(slot)) {
 505                 if (slot == ERR_PTR(-ENOMEM))
 506                         task->tk_timeout = HZ >> 2;
 507                 goto out_sleep;
 508         }
 509         spin_unlock(&tbl->slot_tbl_lock);
 510
 511         args->sa_slot = slot;
 512         res->sr_slot = slot;
 513
 514 out_start:
 515         rpc_call_start(task);
 516         return 0;
 517
 518 out_sleep:
 519         if (args->sa_privileged)
 520                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 521                                 NULL, RPC_PRIORITY_PRIVILEGED);
 522         else
 523                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 524         spin_unlock(&tbl->slot_tbl_lock);
 525         return -EAGAIN;
 526 }
 527
 528 static int nfs40_sequence_done(struct rpc_task *task,
 529                                struct nfs4_sequence_res *res)
 530 {
 531         struct nfs4_slot *slot = res->sr_slot;
 532         struct nfs4_slot_table *tbl;
 533
 534         if (!RPC_WAS_SENT(task))
 535                 goto out;
 536
 537         tbl = slot->table;
 538         spin_lock(&tbl->slot_tbl_lock);
 539         if (!nfs41_wake_and_assign_slot(tbl, slot))
 540                 nfs4_free_slot(tbl, slot);
 541         spin_unlock(&tbl->slot_tbl_lock);
 542
 543         res->sr_slot = NULL;
 544 out:
 545         return 1;
 546 }
 547
 548 #if defined(CONFIG_NFS_V4_1)
 549
 550 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 551 {
 552         struct nfs4_session *session;
 553         struct nfs4_slot_table *tbl;
 554         bool send_new_highest_used_slotid = false;
 555
 556         if (!res->sr_slot) {
 557                 /* just wake up the next guy waiting since
 558                  * we may have not consumed a slot after all */
 559                 dprintk("%s: No slot\n", __func__);
 560                 return;
 561         }
 562         tbl = res->sr_slot->table;
 563         session = tbl->session;
 564
 565         spin_lock(&tbl->slot_tbl_lock);
 566         /* Be nice to the server: try to ensure that the last transmitted
 567          * value for highest_user_slotid <= target_highest_slotid
 568          */
 569         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 570                 send_new_highest_used_slotid = true;
 571
 572         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 573                 send_new_highest_used_slotid = false;
 574                 goto out_unlock;
 575         }
 576         nfs4_free_slot(tbl, res->sr_slot);
 577
 578         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 579                 send_new_highest_used_slotid = false;
 580 out_unlock:
 581         spin_unlock(&tbl->slot_tbl_lock);
 582         res->sr_slot = NULL;
 583         if (send_new_highest_used_slotid)
 584                 nfs41_server_notify_highest_slotid_update(session->clp);
 585 }
 586
 587 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 588 {
 589         struct nfs4_session *session;
 590         struct nfs4_slot *slot;
 591         struct nfs_client *clp;
 592         bool interrupted = false;
 593         int ret = 1;
 594
 595         /* don't increment the sequence number if the task wasn't sent */
 596         if (!RPC_WAS_SENT(task))
 597                 goto out;
 598
 599         slot = res->sr_slot;
 600         session = slot->table->session;
 601
 602         if (slot->interrupted) {
 603                 slot->interrupted = 0;
 604                 interrupted = true;
 605         }
 606
 607         trace_nfs4_sequence_done(session, res);
 608         /* Check the SEQUENCE operation status */
 609         switch (res->sr_status) {
 610         case 0:
 611                 /* Update the slot's sequence and clientid lease timer */
 612                 ++slot->seq_nr;
 613                 clp = session->clp;
 614                 do_renew_lease(clp, res->sr_timestamp);
 615                 /* Check sequence flags */
 616                 if (res->sr_status_flags != 0)
 617                         nfs4_schedule_lease_recovery(clp);
 618                 nfs41_update_target_slotid(slot->table, slot, res);
 619                 break;
 620         case 1:
 621                 /*
 622                  * sr_status remains 1 if an RPC level error occurred.
 623                  * The server may or may not have processed the sequence
 624                  * operation..
 625                  * Mark the slot as having hosted an interrupted RPC call.
 626                  */
 627                 slot->interrupted = 1;
 628                 goto out;
 629         case -NFS4ERR_DELAY:
 630                 /* The server detected a resend of the RPC call and
 631                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 632                  * of RFC5661.
 633                  */
 634                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 635                         __func__,
 636                         slot->slot_nr,
 637                         slot->seq_nr);
 638                 goto out_retry;
 639         case -NFS4ERR_BADSLOT:
 640                 /*
 641                  * The slot id we used was probably retired. Try again
 642                  * using a different slot id.
 643                  */
 644                 goto retry_nowait;
 645         case -NFS4ERR_SEQ_MISORDERED:
 646                 /*
 647                  * Was the last operation on this sequence interrupted?
 648                  * If so, retry after bumping the sequence number.
 649                  */
 650                 if (interrupted) {
 651                         ++slot->seq_nr;
 652                         goto retry_nowait;
 653                 }
 654                 /*
 655                  * Could this slot have been previously retired?
 656                  * If so, then the server may be expecting seq_nr = 1!
 657                  */
 658                 if (slot->seq_nr != 1) {
 659                         slot->seq_nr = 1;
 660                         goto retry_nowait;
 661                 }
 662                 break;
 663         case -NFS4ERR_SEQ_FALSE_RETRY:
 664                 ++slot->seq_nr;
 665                 goto retry_nowait;
 666         default:
 667                 /* Just update the slot sequence no. */
 668                 ++slot->seq_nr;
 669         }
 670 out:
 671         /* The session may be reset by one of the error handlers. */
 672         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 673         nfs41_sequence_free_slot(res);
 674         return ret;
 675 retry_nowait:
 676         if (rpc_restart_call_prepare(task)) {
 677                 task->tk_status = 0;
 678                 ret = 0;
 679         }
 680         goto out;
 681 out_retry:
 682         if (!rpc_restart_call(task))
 683                 goto out;
 684         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 685         return 0;
 686 }
 687
 688 static int nfs4_sequence_done(struct rpc_task *task,
 689                                struct nfs4_sequence_res *res)
 690 {
 691         if (res->sr_slot == NULL)
 692                 return 1;
 693         if (!res->sr_slot->table->session)
 694                 return nfs40_sequence_done(task, res);
 695         return nfs41_sequence_done(task, res);
 696 }
 697
 698 int nfs41_setup_sequence(struct nfs4_session *session,
 699                                 struct nfs4_sequence_args *args,
 700                                 struct nfs4_sequence_res *res,
 701                                 struct rpc_task *task)
 702 {
 703         struct nfs4_slot *slot;
 704         struct nfs4_slot_table *tbl;
 705
 706         dprintk("--> %s\n", __func__);
 707         /* slot already allocated? */
 708         if (res->sr_slot != NULL)
 709                 goto out_success;
 710
 711         tbl = &session->fc_slot_table;
 712
 713         task->tk_timeout = 0;
 714
 715         spin_lock(&tbl->slot_tbl_lock);
 716         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 717             !args->sa_privileged) {
 718                 /* The state manager will wait until the slot table is empty */
 719                 dprintk("%s session is draining\n", __func__);
 720                 goto out_sleep;
 721         }
 722
 723         slot = nfs4_alloc_slot(tbl);
 724         if (IS_ERR(slot)) {
 725                 /* If out of memory, try again in 1/4 second */
 726                 if (slot == ERR_PTR(-ENOMEM))
 727                         task->tk_timeout = HZ >> 2;
 728                 dprintk("<-- %s: no free slots\n", __func__);
 729                 goto out_sleep;
 730         }
 731         spin_unlock(&tbl->slot_tbl_lock);
 732
 733         args->sa_slot = slot;
 734
 735         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 736                         slot->slot_nr, slot->seq_nr);
 737
 738         res->sr_slot = slot;
 739         res->sr_timestamp = jiffies;
 740         res->sr_status_flags = 0;
 741         /*
 742          * sr_status is only set in decode_sequence, and so will remain
 743          * set to 1 if an rpc level failure occurs.
 744          */
 745         res->sr_status = 1;
 746         trace_nfs4_setup_sequence(session, args);
 747 out_success:
 748         rpc_call_start(task);
 749         return 0;
 750 out_sleep:
 751         /* Privileged tasks are queued with top priority */
 752         if (args->sa_privileged)
 753                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 754                                 NULL, RPC_PRIORITY_PRIVILEGED);
 755         else
 756                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 757         spin_unlock(&tbl->slot_tbl_lock);
 758         return -EAGAIN;
 759 }
 760 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 761
 762 static int nfs4_setup_sequence(const struct nfs_server *server,
 763                                struct nfs4_sequence_args *args,
 764                                struct nfs4_sequence_res *res,
 765                                struct rpc_task *task)
 766 {
 767         struct nfs4_session *session = nfs4_get_session(server);
 768         int ret = 0;
 769
 770         if (!session)
 771                 return nfs40_setup_sequence(server, args, res, task);
 772
 773         dprintk("--> %s clp %p session %p sr_slot %u\n",
 774                 __func__, session->clp, session, res->sr_slot ?
 775                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 776
 777         ret = nfs41_setup_sequence(session, args, res, task);
 778
 779         dprintk("<-- %s status=%d\n", __func__, ret);
 780         return ret;
 781 }
 782
 783 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 784 {
 785         struct nfs4_call_sync_data *data = calldata;
 786         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 787
 788         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 789
 790         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 791 }
 792
 793 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 794 {
 795         struct nfs4_call_sync_data *data = calldata;
 796
 797         nfs41_sequence_done(task, data->seq_res);
 798 }
 799
 800 static const struct rpc_call_ops nfs41_call_sync_ops = {
 801         .rpc_call_prepare = nfs41_call_sync_prepare,
 802         .rpc_call_done = nfs41_call_sync_done,
 803 };
 804
 805 #else   /* !CONFIG_NFS_V4_1 */
 806
 807 static int nfs4_setup_sequence(const struct nfs_server *server,
 808                                struct nfs4_sequence_args *args,
 809                                struct nfs4_sequence_res *res,
 810                                struct rpc_task *task)
 811 {
 812         return nfs40_setup_sequence(server, args, res, task);
 813 }
 814
 815 static int nfs4_sequence_done(struct rpc_task *task,
 816                                struct nfs4_sequence_res *res)
 817 {
 818         return nfs40_sequence_done(task, res);
 819 }
 820
 821 #endif  /* !CONFIG_NFS_V4_1 */
 822
 823 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 824 {
 825         struct nfs4_call_sync_data *data = calldata;
 826         nfs4_setup_sequence(data->seq_server,
 827                                 data->seq_args, data->seq_res, task);
 828 }
 829
 830 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 831 {
 832         struct nfs4_call_sync_data *data = calldata;
 833         nfs4_sequence_done(task, data->seq_res);
 834 }
 835
 836 static const struct rpc_call_ops nfs40_call_sync_ops = {
 837         .rpc_call_prepare = nfs40_call_sync_prepare,
 838         .rpc_call_done = nfs40_call_sync_done,
 839 };
 840
 841 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 842                                    struct nfs_server *server,
 843                                    struct rpc_message *msg,
 844                                    struct nfs4_sequence_args *args,
 845                                    struct nfs4_sequence_res *res)
 846 {
 847         int ret;
 848         struct rpc_task *task;
 849         struct nfs_client *clp = server->nfs_client;
 850         struct nfs4_call_sync_data data = {
 851                 .seq_server = server,
 852                 .seq_args = args,
 853                 .seq_res = res,
 854         };
 855         struct rpc_task_setup task_setup = {
 856                 .rpc_client = clnt,
 857                 .rpc_message = msg,
 858                 .callback_ops = clp->cl_mvops->call_sync_ops,
 859                 .callback_data = &data
 860         };
 861
 862         task = rpc_run_task(&task_setup);
 863         if (IS_ERR(task))
 864                 ret = PTR_ERR(task);
 865         else {
 866                 ret = task->tk_status;
 867                 rpc_put_task(task);
 868         }
 869         return ret;
 870 }
 871
 872 static
 873 int nfs4_call_sync(struct rpc_clnt *clnt,
 874                    struct nfs_server *server,
 875                    struct rpc_message *msg,
 876                    struct nfs4_sequence_args *args,
 877                    struct nfs4_sequence_res *res,
 878                    int cache_reply)
 879 {
 880         nfs4_init_sequence(args, res, cache_reply);
 881         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 882 }
 883
 884 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 885 {
 886         struct nfs_inode *nfsi = NFS_I(dir);
 887
 888         spin_lock(&dir->i_lock);
 889         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 890         if (!cinfo->atomic || cinfo->before != dir->i_version)
 891                 nfs_force_lookup_revalidate(dir);
 892         dir->i_version = cinfo->after;
 893         nfs_fscache_invalidate(dir);
 894         spin_unlock(&dir->i_lock);
 895 }
 896
 897 struct nfs4_opendata {
 898         struct kref kref;
 899         struct nfs_openargs o_arg;
 900         struct nfs_openres o_res;
 901         struct nfs_open_confirmargs c_arg;
 902         struct nfs_open_confirmres c_res;
 903         struct nfs4_string owner_name;
 904         struct nfs4_string group_name;
 905         struct nfs_fattr f_attr;
 906         struct nfs4_label *f_label;
 907         struct dentry *dir;
 908         struct dentry *dentry;
 909         struct nfs4_state_owner *owner;
 910         struct nfs4_state *state;
 911         struct iattr attrs;
 912         unsigned long timestamp;
 913         unsigned int rpc_done : 1;
 914         unsigned int is_recover : 1;
 915         int rpc_status;
 916         int cancelled;
 917 };
 918
 919 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 920                 int err, struct nfs4_exception *exception)
 921 {
 922         if (err != -EINVAL)
 923                 return false;
 924         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 925                 return false;
 926         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 927         exception->retry = 1;
 928         return true;
 929 }
 930
 931 static enum open_claim_type4
 932 nfs4_map_atomic_open_claim(struct nfs_server *server,
 933                 enum open_claim_type4 claim)
 934 {
 935         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 936                 return claim;
 937         switch (claim) {
 938         default:
 939                 return claim;
 940         case NFS4_OPEN_CLAIM_FH:
 941                 return NFS4_OPEN_CLAIM_NULL;
 942         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 943                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 944         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 945                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 946         }
 947 }
 948
 949 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 950 {
 951         p->o_res.f_attr = &p->f_attr;
 952         p->o_res.f_label = p->f_label;
 953         p->o_res.seqid = p->o_arg.seqid;
 954         p->c_res.seqid = p->c_arg.seqid;
 955         p->o_res.server = p->o_arg.server;
 956         p->o_res.access_request = p->o_arg.access;
 957         nfs_fattr_init(&p->f_attr);
 958         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 959 }
 960
 961 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 962                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 963                 const struct iattr *attrs,
 964                 struct nfs4_label *label,
 965                 enum open_claim_type4 claim,
 966                 gfp_t gfp_mask)
 967 {
 968         struct dentry *parent = dget_parent(dentry);
 969         struct inode *dir = parent->d_inode;
 970         struct nfs_server *server = NFS_SERVER(dir);
 971         struct nfs4_opendata *p;
 972
 973         p = kzalloc(sizeof(*p), gfp_mask);
 974         if (p == NULL)
 975                 goto err;
 976
 977         p->f_label = nfs4_label_alloc(server, gfp_mask);
 978         if (IS_ERR(p->f_label))
 979                 goto err_free_p;
 980
 981         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 982         if (p->o_arg.seqid == NULL)
 983                 goto err_free_label;
 984         nfs_sb_active(dentry->d_sb);
 985         p->dentry = dget(dentry);
 986         p->dir = parent;
 987         p->owner = sp;
 988         atomic_inc(&sp->so_count);
 989         p->o_arg.open_flags = flags;
 990         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 991         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 992          * will return permission denied for all bits until close */
 993         if (!(flags & O_EXCL)) {
 994                 /* ask server to check for all possible rights as results
 995                  * are cached */
 996                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 997                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 998         }
 999         p->o_arg.clientid = server->nfs_client->cl_clientid;
1000         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1001         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1002         p->o_arg.name = &dentry->d_name;
1003         p->o_arg.server = server;
1004         p->o_arg.bitmask = nfs4_bitmask(server, label);
1005         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1006         p->o_arg.label = label;
1007         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1008         switch (p->o_arg.claim) {
1009         case NFS4_OPEN_CLAIM_NULL:
1010         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1011         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1012                 p->o_arg.fh = NFS_FH(dir);
1013                 break;
1014         case NFS4_OPEN_CLAIM_PREVIOUS:
1015         case NFS4_OPEN_CLAIM_FH:
1016         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1017         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1018                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1019         }
1020         if (attrs != NULL && attrs->ia_valid != 0) {
1021                 __u32 verf[2];
1022
1023                 p->o_arg.u.attrs = &p->attrs;
1024                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1025
1026                 verf[0] = jiffies;
1027                 verf[1] = current->pid;
1028                 memcpy(p->o_arg.u.verifier.data, verf,
1029                                 sizeof(p->o_arg.u.verifier.data));
1030         }
1031         p->c_arg.fh = &p->o_res.fh;
1032         p->c_arg.stateid = &p->o_res.stateid;
1033         p->c_arg.seqid = p->o_arg.seqid;
1034         nfs4_init_opendata_res(p);
1035         kref_init(&p->kref);
1036         return p;
1037
1038 err_free_label:
1039         nfs4_label_free(p->f_label);
1040 err_free_p:
1041         kfree(p);
1042 err:
1043         dput(parent);
1044         return NULL;
1045 }
1046
1047 static void nfs4_opendata_free(struct kref *kref)
1048 {
1049         struct nfs4_opendata *p = container_of(kref,
1050                         struct nfs4_opendata, kref);
1051         struct super_block *sb = p->dentry->d_sb;
1052
1053         nfs_free_seqid(p->o_arg.seqid);
1054         if (p->state != NULL)
1055                 nfs4_put_open_state(p->state);
1056         nfs4_put_state_owner(p->owner);
1057
1058         nfs4_label_free(p->f_label);
1059
1060         dput(p->dir);
1061         dput(p->dentry);
1062         nfs_sb_deactive(sb);
1063         nfs_fattr_free_names(&p->f_attr);
1064         kfree(p);
1065 }
1066
1067 static void nfs4_opendata_put(struct nfs4_opendata *p)
1068 {
1069         if (p != NULL)
1070                 kref_put(&p->kref, nfs4_opendata_free);
1071 }
1072
1073 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1074 {
1075         int ret;
1076
1077         ret = rpc_wait_for_completion_task(task);
1078         return ret;
1079 }
1080
1081 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1082 {
1083         int ret = 0;
1084
1085         if (open_mode & (O_EXCL|O_TRUNC))
1086                 goto out;
1087         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1088                 case FMODE_READ:
1089                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1090                                 && state->n_rdonly != 0;
1091                         break;
1092                 case FMODE_WRITE:
1093                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1094                                 && state->n_wronly != 0;
1095                         break;
1096                 case FMODE_READ|FMODE_WRITE:
1097                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1098                                 && state->n_rdwr != 0;
1099         }
1100 out:
1101         return ret;
1102 }
1103
1104 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1105 {
1106         if (delegation == NULL)
1107                 return 0;
1108         if ((delegation->type & fmode) != fmode)
1109                 return 0;
1110         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1111                 return 0;
1112         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1113                 return 0;
1114         nfs_mark_delegation_referenced(delegation);
1115         return 1;
1116 }
1117
1118 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1119 {
1120         switch (fmode) {
1121                 case FMODE_WRITE:
1122                         state->n_wronly++;
1123                         break;
1124                 case FMODE_READ:
1125                         state->n_rdonly++;
1126                         break;
1127                 case FMODE_READ|FMODE_WRITE:
1128                         state->n_rdwr++;
1129         }
1130         nfs4_state_set_mode_locked(state, state->state | fmode);
1131 }
1132
1133 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1134 {
1135         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1136                 nfs4_stateid_copy(&state->stateid, stateid);
1137         nfs4_stateid_copy(&state->open_stateid, stateid);
1138         set_bit(NFS_OPEN_STATE, &state->flags);
1139         switch (fmode) {
1140                 case FMODE_READ:
1141                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1142                         break;
1143                 case FMODE_WRITE:
1144                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1145                         break;
1146                 case FMODE_READ|FMODE_WRITE:
1147                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1148         }
1149 }
1150
1151 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1152 {
1153         write_seqlock(&state->seqlock);
1154         nfs_set_open_stateid_locked(state, stateid, fmode);
1155         write_sequnlock(&state->seqlock);
1156 }
1157
1158 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1159 {
1160         /*
1161          * Protect the call to nfs4_state_set_mode_locked and
1162          * serialise the stateid update
1163          */
1164         write_seqlock(&state->seqlock);
1165         if (deleg_stateid != NULL) {
1166                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1167                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1168         }
1169         if (open_stateid != NULL)
1170                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1171         write_sequnlock(&state->seqlock);
1172         spin_lock(&state->owner->so_lock);
1173         update_open_stateflags(state, fmode);
1174         spin_unlock(&state->owner->so_lock);
1175 }
1176
1177 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1178 {
1179         struct nfs_inode *nfsi = NFS_I(state->inode);
1180         struct nfs_delegation *deleg_cur;
1181         int ret = 0;
1182
1183         fmode &= (FMODE_READ|FMODE_WRITE);
1184
1185         rcu_read_lock();
1186         deleg_cur = rcu_dereference(nfsi->delegation);
1187         if (deleg_cur == NULL)
1188                 goto no_delegation;
1189
1190         spin_lock(&deleg_cur->lock);
1191         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1192            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1193             (deleg_cur->type & fmode) != fmode)
1194                 goto no_delegation_unlock;
1195
1196         if (delegation == NULL)
1197                 delegation = &deleg_cur->stateid;
1198         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1199                 goto no_delegation_unlock;
1200
1201         nfs_mark_delegation_referenced(deleg_cur);
1202         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1203         ret = 1;
1204 no_delegation_unlock:
1205         spin_unlock(&deleg_cur->lock);
1206 no_delegation:
1207         rcu_read_unlock();
1208
1209         if (!ret && open_stateid != NULL) {
1210                 __update_open_stateid(state, open_stateid, NULL, fmode);
1211                 ret = 1;
1212         }
1213
1214         return ret;
1215 }
1216
1217
1218 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1219 {
1220         struct nfs_delegation *delegation;
1221
1222         rcu_read_lock();
1223         delegation = rcu_dereference(NFS_I(inode)->delegation);
1224         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1225                 rcu_read_unlock();
1226                 return;
1227         }
1228         rcu_read_unlock();
1229         nfs4_inode_return_delegation(inode);
1230 }
1231
1232 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1233 {
1234         struct nfs4_state *state = opendata->state;
1235         struct nfs_inode *nfsi = NFS_I(state->inode);
1236         struct nfs_delegation *delegation;
1237         int open_mode = opendata->o_arg.open_flags;
1238         fmode_t fmode = opendata->o_arg.fmode;
1239         nfs4_stateid stateid;
1240         int ret = -EAGAIN;
1241
1242         for (;;) {
1243                 if (can_open_cached(state, fmode, open_mode)) {
1244                         spin_lock(&state->owner->so_lock);
1245                         if (can_open_cached(state, fmode, open_mode)) {
1246                                 update_open_stateflags(state, fmode);
1247                                 spin_unlock(&state->owner->so_lock);
1248                                 goto out_return_state;
1249                         }
1250                         spin_unlock(&state->owner->so_lock);
1251                 }
1252                 rcu_read_lock();
1253                 delegation = rcu_dereference(nfsi->delegation);
1254                 if (!can_open_delegated(delegation, fmode)) {
1255                         rcu_read_unlock();
1256                         break;
1257                 }
1258                 /* Save the delegation */
1259                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1260                 rcu_read_unlock();
1261                 nfs_release_seqid(opendata->o_arg.seqid);
1262                 if (!opendata->is_recover) {
1263                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1264                         if (ret != 0)
1265                                 goto out;
1266                 }
1267                 ret = -EAGAIN;
1268
1269                 /* Try to update the stateid using the delegation */
1270                 if (update_open_stateid(state, NULL, &stateid, fmode))
1271                         goto out_return_state;
1272         }
1273 out:
1274         return ERR_PTR(ret);
1275 out_return_state:
1276         atomic_inc(&state->count);
1277         return state;
1278 }
1279
1280 static void
1281 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1282 {
1283         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1284         struct nfs_delegation *delegation;
1285         int delegation_flags = 0;
1286
1287         rcu_read_lock();
1288         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1289         if (delegation)
1290                 delegation_flags = delegation->flags;
1291         rcu_read_unlock();
1292         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1293                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1294                                    "returning a delegation for "
1295                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1296                                    clp->cl_hostname);
1297         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1298                 nfs_inode_set_delegation(state->inode,
1299                                          data->owner->so_cred,
1300                                          &data->o_res);
1301         else
1302                 nfs_inode_reclaim_delegation(state->inode,
1303                                              data->owner->so_cred,
1304                                              &data->o_res);
1305 }
1306
1307 /*
1308  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1309  * and update the nfs4_state.
1310  */
1311 static struct nfs4_state *
1312 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1313 {
1314         struct inode *inode = data->state->inode;
1315         struct nfs4_state *state = data->state;
1316         int ret;
1317
1318         if (!data->rpc_done) {
1319                 ret = data->rpc_status;
1320                 goto err;
1321         }
1322
1323         ret = -ESTALE;
1324         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1325             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1326             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1327                 goto err;
1328
1329         ret = -ENOMEM;
1330         state = nfs4_get_open_state(inode, data->owner);
1331         if (state == NULL)
1332                 goto err;
1333
1334         ret = nfs_refresh_inode(inode, &data->f_attr);
1335         if (ret)
1336                 goto err;
1337
1338         nfs_setsecurity(inode, &data->f_attr, data->f_label);
1339
1340         if (data->o_res.delegation_type != 0)
1341                 nfs4_opendata_check_deleg(data, state);
1342         update_open_stateid(state, &data->o_res.stateid, NULL,
1343                             data->o_arg.fmode);
1344
1345         return state;
1346 err:
1347         return ERR_PTR(ret);
1348
1349 }
1350
1351 static struct nfs4_state *
1352 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1353 {
1354         struct inode *inode;
1355         struct nfs4_state *state = NULL;
1356         int ret;
1357
1358         if (!data->rpc_done) {
1359                 state = nfs4_try_open_cached(data);
1360                 goto out;
1361         }
1362
1363         ret = -EAGAIN;
1364         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1365                 goto err;
1366         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1367         ret = PTR_ERR(inode);
1368         if (IS_ERR(inode))
1369                 goto err;
1370         ret = -ENOMEM;
1371         state = nfs4_get_open_state(inode, data->owner);
1372         if (state == NULL)
1373                 goto err_put_inode;
1374         if (data->o_res.delegation_type != 0)
1375                 nfs4_opendata_check_deleg(data, state);
1376         update_open_stateid(state, &data->o_res.stateid, NULL,
1377                         data->o_arg.fmode);
1378         iput(inode);
1379 out:
1380         nfs_release_seqid(data->o_arg.seqid);
1381         return state;
1382 err_put_inode:
1383         iput(inode);
1384 err:
1385         return ERR_PTR(ret);
1386 }
1387
1388 static struct nfs4_state *
1389 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1390 {
1391         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1392                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1393         return _nfs4_opendata_to_nfs4_state(data);
1394 }
1395
1396 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1397 {
1398         struct nfs_inode *nfsi = NFS_I(state->inode);
1399         struct nfs_open_context *ctx;
1400
1401         spin_lock(&state->inode->i_lock);
1402         list_for_each_entry(ctx, &nfsi->open_files, list) {
1403                 if (ctx->state != state)
1404                         continue;
1405                 get_nfs_open_context(ctx);
1406                 spin_unlock(&state->inode->i_lock);
1407                 return ctx;
1408         }
1409         spin_unlock(&state->inode->i_lock);
1410         return ERR_PTR(-ENOENT);
1411 }
1412
1413 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1414                 struct nfs4_state *state, enum open_claim_type4 claim)
1415 {
1416         struct nfs4_opendata *opendata;
1417
1418         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1419                         NULL, NULL, claim, GFP_NOFS);
1420         if (opendata == NULL)
1421                 return ERR_PTR(-ENOMEM);
1422         opendata->state = state;
1423         atomic_inc(&state->count);
1424         return opendata;
1425 }
1426
1427 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1428 {
1429         struct nfs4_state *newstate;
1430         int ret;
1431
1432         opendata->o_arg.open_flags = 0;
1433         opendata->o_arg.fmode = fmode;
1434         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1435         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1436         nfs4_init_opendata_res(opendata);
1437         ret = _nfs4_recover_proc_open(opendata);
1438         if (ret != 0)
1439                 return ret;
1440         newstate = nfs4_opendata_to_nfs4_state(opendata);
1441         if (IS_ERR(newstate))
1442                 return PTR_ERR(newstate);
1443         nfs4_close_state(newstate, fmode);
1444         *res = newstate;
1445         return 0;
1446 }
1447
1448 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1449 {
1450         struct nfs4_state *newstate;
1451         int ret;
1452
1453         /* memory barrier prior to reading state->n_* */
1454         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1455         clear_bit(NFS_OPEN_STATE, &state->flags);
1456         smp_rmb();
1457         if (state->n_rdwr != 0) {
1458                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1459                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1460                 if (ret != 0)
1461                         return ret;
1462                 if (newstate != state)
1463                         return -ESTALE;
1464         }
1465         if (state->n_wronly != 0) {
1466                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1467                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1468                 if (ret != 0)
1469                         return ret;
1470                 if (newstate != state)
1471                         return -ESTALE;
1472         }
1473         if (state->n_rdonly != 0) {
1474                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1475                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1476                 if (ret != 0)
1477                         return ret;
1478                 if (newstate != state)
1479                         return -ESTALE;
1480         }
1481         /*
1482          * We may have performed cached opens for all three recoveries.
1483          * Check if we need to update the current stateid.
1484          */
1485         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1486             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1487                 write_seqlock(&state->seqlock);
1488                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1489                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1490                 write_sequnlock(&state->seqlock);
1491         }
1492         return 0;
1493 }
1494
1495 /*
1496  * OPEN_RECLAIM:
1497  *      reclaim state on the server after a reboot.
1498  */
1499 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1500 {
1501         struct nfs_delegation *delegation;
1502         struct nfs4_opendata *opendata;
1503         fmode_t delegation_type = 0;
1504         int status;
1505
1506         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1507                         NFS4_OPEN_CLAIM_PREVIOUS);
1508         if (IS_ERR(opendata))
1509                 return PTR_ERR(opendata);
1510         rcu_read_lock();
1511         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1512         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1513                 delegation_type = delegation->type;
1514         rcu_read_unlock();
1515         opendata->o_arg.u.delegation_type = delegation_type;
1516         status = nfs4_open_recover(opendata, state);
1517         nfs4_opendata_put(opendata);
1518         return status;
1519 }
1520
1521 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1522 {
1523         struct nfs_server *server = NFS_SERVER(state->inode);
1524         struct nfs4_exception exception = { };
1525         int err;
1526         do {
1527                 err = _nfs4_do_open_reclaim(ctx, state);
1528                 trace_nfs4_open_reclaim(ctx, 0, err);
1529                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1530                         continue;
1531                 if (err != -NFS4ERR_DELAY)
1532                         break;
1533                 nfs4_handle_exception(server, err, &exception);
1534         } while (exception.retry);
1535         return err;
1536 }
1537
1538 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1539 {
1540         struct nfs_open_context *ctx;
1541         int ret;
1542
1543         ctx = nfs4_state_find_open_context(state);
1544         if (IS_ERR(ctx))
1545                 return -EAGAIN;
1546         ret = nfs4_do_open_reclaim(ctx, state);
1547         put_nfs_open_context(ctx);
1548         return ret;
1549 }
1550
1551 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1552 {
1553         switch (err) {
1554                 default:
1555                         printk(KERN_ERR "NFS: %s: unhandled error "
1556                                         "%d.\n", __func__, err);
1557                 case 0:
1558                 case -ENOENT:
1559                 case -ESTALE:
1560                         break;
1561                 case -NFS4ERR_BADSESSION:
1562                 case -NFS4ERR_BADSLOT:
1563                 case -NFS4ERR_BAD_HIGH_SLOT:
1564                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1565                 case -NFS4ERR_DEADSESSION:
1566                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1567                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1568                         return -EAGAIN;
1569                 case -NFS4ERR_STALE_CLIENTID:
1570                 case -NFS4ERR_STALE_STATEID:
1571                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1572                 case -NFS4ERR_EXPIRED:
1573                         /* Don't recall a delegation if it was lost */
1574                         nfs4_schedule_lease_recovery(server->nfs_client);
1575                         return -EAGAIN;
1576                 case -NFS4ERR_DELEG_REVOKED:
1577                 case -NFS4ERR_ADMIN_REVOKED:
1578                 case -NFS4ERR_BAD_STATEID:
1579                 case -NFS4ERR_OPENMODE:
1580                         nfs_inode_find_state_and_recover(state->inode,
1581                                         stateid);
1582                         nfs4_schedule_stateid_recovery(server, state);
1583                         return 0;
1584                 case -NFS4ERR_DELAY:
1585                 case -NFS4ERR_GRACE:
1586                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1587                         ssleep(1);
1588                         return -EAGAIN;
1589                 case -ENOMEM:
1590                 case -NFS4ERR_DENIED:
1591                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1592                         return 0;
1593         }
1594         return err;
1595 }
1596
1597 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1598 {
1599         struct nfs_server *server = NFS_SERVER(state->inode);
1600         struct nfs4_opendata *opendata;
1601         int err;
1602
1603         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1604                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1605         if (IS_ERR(opendata))
1606                 return PTR_ERR(opendata);
1607         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1608         err = nfs4_open_recover(opendata, state);
1609         nfs4_opendata_put(opendata);
1610         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1611 }
1612
1613 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1614 {
1615         struct nfs4_opendata *data = calldata;
1616
1617         nfs40_setup_sequence(data->o_arg.server, &data->o_arg.seq_args,
1618                                 &data->o_res.seq_res, task);
1619 }
1620
1621 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1622 {
1623         struct nfs4_opendata *data = calldata;
1624
1625         nfs40_sequence_done(task, &data->o_res.seq_res);
1626
1627         data->rpc_status = task->tk_status;
1628         if (data->rpc_status == 0) {
1629                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1630                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1631                 renew_lease(data->o_res.server, data->timestamp);
1632                 data->rpc_done = 1;
1633         }
1634 }
1635
1636 static void nfs4_open_confirm_release(void *calldata)
1637 {
1638         struct nfs4_opendata *data = calldata;
1639         struct nfs4_state *state = NULL;
1640
1641         /* If this request hasn't been cancelled, do nothing */
1642         if (data->cancelled == 0)
1643                 goto out_free;
1644         /* In case of error, no cleanup! */
1645         if (!data->rpc_done)
1646                 goto out_free;
1647         state = nfs4_opendata_to_nfs4_state(data);
1648         if (!IS_ERR(state))
1649                 nfs4_close_state(state, data->o_arg.fmode);
1650 out_free:
1651         nfs4_opendata_put(data);
1652 }
1653
1654 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1655         .rpc_call_prepare = nfs4_open_confirm_prepare,
1656         .rpc_call_done = nfs4_open_confirm_done,
1657         .rpc_release = nfs4_open_confirm_release,
1658 };
1659
1660 /*
1661  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1662  */
1663 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1664 {
1665         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1666         struct rpc_task *task;
1667         struct  rpc_message msg = {
1668                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1669                 .rpc_argp = &data->c_arg,
1670                 .rpc_resp = &data->c_res,
1671                 .rpc_cred = data->owner->so_cred,
1672         };
1673         struct rpc_task_setup task_setup_data = {
1674                 .rpc_client = server->client,
1675                 .rpc_message = &msg,
1676                 .callback_ops = &nfs4_open_confirm_ops,
1677                 .callback_data = data,
1678                 .workqueue = nfsiod_workqueue,
1679                 .flags = RPC_TASK_ASYNC,
1680         };
1681         int status;
1682
1683         nfs4_init_sequence(&data->o_arg.seq_args, &data->o_res.seq_res, 1);
1684         kref_get(&data->kref);
1685         data->rpc_done = 0;
1686         data->rpc_status = 0;
1687         data->timestamp = jiffies;
1688         task = rpc_run_task(&task_setup_data);
1689         if (IS_ERR(task))
1690                 return PTR_ERR(task);
1691         status = nfs4_wait_for_completion_rpc_task(task);
1692         if (status != 0) {
1693                 data->cancelled = 1;
1694                 smp_wmb();
1695         } else
1696                 status = data->rpc_status;
1697         rpc_put_task(task);
1698         return status;
1699 }
1700
1701 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1702 {
1703         struct nfs4_opendata *data = calldata;
1704         struct nfs4_state_owner *sp = data->owner;
1705         struct nfs_client *clp = sp->so_server->nfs_client;
1706
1707         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1708                 goto out_wait;
1709         /*
1710          * Check if we still need to send an OPEN call, or if we can use
1711          * a delegation instead.
1712          */
1713         if (data->state != NULL) {
1714                 struct nfs_delegation *delegation;
1715
1716                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1717                         goto out_no_action;
1718                 rcu_read_lock();
1719                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1720                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1721                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1722                     can_open_delegated(delegation, data->o_arg.fmode))
1723                         goto unlock_no_action;
1724                 rcu_read_unlock();
1725         }
1726         /* Update client id. */
1727         data->o_arg.clientid = clp->cl_clientid;
1728         switch (data->o_arg.claim) {
1729         case NFS4_OPEN_CLAIM_PREVIOUS:
1730         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1731         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1732                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1733         case NFS4_OPEN_CLAIM_FH:
1734                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1735                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1736         }
1737         data->timestamp = jiffies;
1738         if (nfs4_setup_sequence(data->o_arg.server,
1739                                 &data->o_arg.seq_args,
1740                                 &data->o_res.seq_res,
1741                                 task) != 0)
1742                 nfs_release_seqid(data->o_arg.seqid);
1743
1744         /* Set the create mode (note dependency on the session type) */
1745         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1746         if (data->o_arg.open_flags & O_EXCL) {
1747                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1748                 if (nfs4_has_persistent_session(clp))
1749                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1750                 else if (clp->cl_mvops->minor_version > 0)
1751                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1752         }
1753         return;
1754 unlock_no_action:
1755         rcu_read_unlock();
1756 out_no_action:
1757         task->tk_action = NULL;
1758 out_wait:
1759         nfs4_sequence_done(task, &data->o_res.seq_res);
1760 }
1761
1762 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1763 {
1764         struct nfs4_opendata *data = calldata;
1765
1766         data->rpc_status = task->tk_status;
1767
1768         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1769                 return;
1770
1771         if (task->tk_status == 0) {
1772                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1773                         switch (data->o_res.f_attr->mode & S_IFMT) {
1774                         case S_IFREG:
1775                                 break;
1776                         case S_IFLNK:
1777                                 data->rpc_status = -ELOOP;
1778                                 break;
1779                         case S_IFDIR:
1780                                 data->rpc_status = -EISDIR;
1781                                 break;
1782                         default:
1783                                 data->rpc_status = -ENOTDIR;
1784                         }
1785                 }
1786                 renew_lease(data->o_res.server, data->timestamp);
1787                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1788                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1789         }
1790         data->rpc_done = 1;
1791 }
1792
1793 static void nfs4_open_release(void *calldata)
1794 {
1795         struct nfs4_opendata *data = calldata;
1796         struct nfs4_state *state = NULL;
1797
1798         /* If this request hasn't been cancelled, do nothing */
1799         if (data->cancelled == 0)
1800                 goto out_free;
1801         /* In case of error, no cleanup! */
1802         if (data->rpc_status != 0 || !data->rpc_done)
1803                 goto out_free;
1804         /* In case we need an open_confirm, no cleanup! */
1805         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1806                 goto out_free;
1807         state = nfs4_opendata_to_nfs4_state(data);
1808         if (!IS_ERR(state))
1809                 nfs4_close_state(state, data->o_arg.fmode);
1810 out_free:
1811         nfs4_opendata_put(data);
1812 }
1813
1814 static const struct rpc_call_ops nfs4_open_ops = {
1815         .rpc_call_prepare = nfs4_open_prepare,
1816         .rpc_call_done = nfs4_open_done,
1817         .rpc_release = nfs4_open_release,
1818 };
1819
1820 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1821 {
1822         struct inode *dir = data->dir->d_inode;
1823         struct nfs_server *server = NFS_SERVER(dir);
1824         struct nfs_openargs *o_arg = &data->o_arg;
1825         struct nfs_openres *o_res = &data->o_res;
1826         struct rpc_task *task;
1827         struct rpc_message msg = {
1828                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1829                 .rpc_argp = o_arg,
1830                 .rpc_resp = o_res,
1831                 .rpc_cred = data->owner->so_cred,
1832         };
1833         struct rpc_task_setup task_setup_data = {
1834                 .rpc_client = server->client,
1835                 .rpc_message = &msg,
1836                 .callback_ops = &nfs4_open_ops,
1837                 .callback_data = data,
1838                 .workqueue = nfsiod_workqueue,
1839                 .flags = RPC_TASK_ASYNC,
1840         };
1841         int status;
1842
1843         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1844         kref_get(&data->kref);
1845         data->rpc_done = 0;
1846         data->rpc_status = 0;
1847         data->cancelled = 0;
1848         data->is_recover = 0;
1849         if (isrecover) {
1850                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1851                 data->is_recover = 1;
1852         }
1853         task = rpc_run_task(&task_setup_data);
1854         if (IS_ERR(task))
1855                 return PTR_ERR(task);
1856         status = nfs4_wait_for_completion_rpc_task(task);
1857         if (status != 0) {
1858                 data->cancelled = 1;
1859                 smp_wmb();
1860         } else
1861                 status = data->rpc_status;
1862         rpc_put_task(task);
1863
1864         return status;
1865 }
1866
1867 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1868 {
1869         struct inode *dir = data->dir->d_inode;
1870         struct nfs_openres *o_res = &data->o_res;
1871         int status;
1872
1873         status = nfs4_run_open_task(data, 1);
1874         if (status != 0 || !data->rpc_done)
1875                 return status;
1876
1877         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1878
1879         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1880                 status = _nfs4_proc_open_confirm(data);
1881                 if (status != 0)
1882                         return status;
1883         }
1884
1885         return status;
1886 }
1887
1888 static int nfs4_opendata_access(struct rpc_cred *cred,
1889                                 struct nfs4_opendata *opendata,
1890                                 struct nfs4_state *state, fmode_t fmode,
1891                                 int openflags)
1892 {
1893         struct nfs_access_entry cache;
1894         u32 mask;
1895
1896         /* access call failed or for some reason the server doesn't
1897          * support any access modes -- defer access call until later */
1898         if (opendata->o_res.access_supported == 0)
1899                 return 0;
1900
1901         mask = 0;
1902         /* don't check MAY_WRITE - a newly created file may not have
1903          * write mode bits, but POSIX allows the creating process to write.
1904          * use openflags to check for exec, because fmode won't
1905          * always have FMODE_EXEC set when file open for exec. */
1906         if (openflags & __FMODE_EXEC) {
1907                 /* ONLY check for exec rights */
1908                 mask = MAY_EXEC;
1909         } else if (fmode & FMODE_READ)
1910                 mask = MAY_READ;
1911
1912         cache.cred = cred;
1913         cache.jiffies = jiffies;
1914         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1915         nfs_access_add_cache(state->inode, &cache);
1916
1917         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1918                 return 0;
1919
1920         /* even though OPEN succeeded, access is denied. Close the file */
1921         nfs4_close_state(state, fmode);
1922         return -EACCES;
1923 }
1924
1925 /*
1926  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1927  */
1928 static int _nfs4_proc_open(struct nfs4_opendata *data)
1929 {
1930         struct inode *dir = data->dir->d_inode;
1931         struct nfs_server *server = NFS_SERVER(dir);
1932         struct nfs_openargs *o_arg = &data->o_arg;
1933         struct nfs_openres *o_res = &data->o_res;
1934         int status;
1935
1936         status = nfs4_run_open_task(data, 0);
1937         if (!data->rpc_done)
1938                 return status;
1939         if (status != 0) {
1940                 if (status == -NFS4ERR_BADNAME &&
1941                                 !(o_arg->open_flags & O_CREAT))
1942                         return -ENOENT;
1943                 return status;
1944         }
1945
1946         nfs_fattr_map_and_free_names(server, &data->f_attr);
1947
1948         if (o_arg->open_flags & O_CREAT)
1949                 update_changeattr(dir, &o_res->cinfo);
1950         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1951                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1952         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1953                 status = _nfs4_proc_open_confirm(data);
1954                 if (status != 0)
1955                         return status;
1956         }
1957         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1958                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1959         return 0;
1960 }
1961
1962 static int nfs4_recover_expired_lease(struct nfs_server *server)
1963 {
1964         return nfs4_client_recover_expired_lease(server->nfs_client);
1965 }
1966
1967 /*
1968  * OPEN_EXPIRED:
1969  *      reclaim state on the server after a network partition.
1970  *      Assumes caller holds the appropriate lock
1971  */
1972 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1973 {
1974         struct nfs4_opendata *opendata;
1975         int ret;
1976
1977         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1978                         NFS4_OPEN_CLAIM_FH);
1979         if (IS_ERR(opendata))
1980                 return PTR_ERR(opendata);
1981         ret = nfs4_open_recover(opendata, state);
1982         if (ret == -ESTALE)
1983                 d_drop(ctx->dentry);
1984         nfs4_opendata_put(opendata);
1985         return ret;
1986 }
1987
1988 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1989 {
1990         struct nfs_server *server = NFS_SERVER(state->inode);
1991         struct nfs4_exception exception = { };
1992         int err;
1993
1994         do {
1995                 err = _nfs4_open_expired(ctx, state);
1996                 trace_nfs4_open_expired(ctx, 0, err);
1997                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1998                         continue;
1999                 switch (err) {
2000                 default:
2001                         goto out;
2002                 case -NFS4ERR_GRACE:
2003                 case -NFS4ERR_DELAY:
2004                         nfs4_handle_exception(server, err, &exception);
2005                         err = 0;
2006                 }
2007         } while (exception.retry);
2008 out:
2009         return err;
2010 }
2011
2012 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2013 {
2014         struct nfs_open_context *ctx;
2015         int ret;
2016
2017         ctx = nfs4_state_find_open_context(state);
2018         if (IS_ERR(ctx))
2019                 return -EAGAIN;
2020         ret = nfs4_do_open_expired(ctx, state);
2021         put_nfs_open_context(ctx);
2022         return ret;
2023 }
2024
2025 #if defined(CONFIG_NFS_V4_1)
2026 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2027 {
2028         struct nfs_server *server = NFS_SERVER(state->inode);
2029         nfs4_stateid *stateid = &state->stateid;
2030         struct nfs_delegation *delegation;
2031         struct rpc_cred *cred = NULL;
2032         int status = -NFS4ERR_BAD_STATEID;
2033
2034         /* If a state reset has been done, test_stateid is unneeded */
2035         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2036                 return;
2037
2038         /* Get the delegation credential for use by test/free_stateid */
2039         rcu_read_lock();
2040         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2041         if (delegation != NULL &&
2042             nfs4_stateid_match(&delegation->stateid, stateid)) {
2043                 cred = get_rpccred(delegation->cred);
2044                 rcu_read_unlock();
2045                 status = nfs41_test_stateid(server, stateid, cred);
2046                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2047         } else
2048                 rcu_read_unlock();
2049
2050         if (status != NFS_OK) {
2051                 /* Free the stateid unless the server explicitly
2052                  * informs us the stateid is unrecognized. */
2053                 if (status != -NFS4ERR_BAD_STATEID)
2054                         nfs41_free_stateid(server, stateid, cred);
2055                 nfs_remove_bad_delegation(state->inode);
2056
2057                 write_seqlock(&state->seqlock);
2058                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2059                 write_sequnlock(&state->seqlock);
2060                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2061         }
2062
2063         if (cred != NULL)
2064                 put_rpccred(cred);
2065 }
2066
2067 /**
2068  * nfs41_check_open_stateid - possibly free an open stateid
2069  *
2070  * @state: NFSv4 state for an inode
2071  *
2072  * Returns NFS_OK if recovery for this stateid is now finished.
2073  * Otherwise a negative NFS4ERR value is returned.
2074  */
2075 static int nfs41_check_open_stateid(struct nfs4_state *state)
2076 {
2077         struct nfs_server *server = NFS_SERVER(state->inode);
2078         nfs4_stateid *stateid = &state->open_stateid;
2079         struct rpc_cred *cred = state->owner->so_cred;
2080         int status;
2081
2082         /* If a state reset has been done, test_stateid is unneeded */
2083         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2084             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2085             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2086                 return -NFS4ERR_BAD_STATEID;
2087
2088         status = nfs41_test_stateid(server, stateid, cred);
2089         trace_nfs4_test_open_stateid(state, NULL, status);
2090         if (status != NFS_OK) {
2091                 /* Free the stateid unless the server explicitly
2092                  * informs us the stateid is unrecognized. */
2093                 if (status != -NFS4ERR_BAD_STATEID)
2094                         nfs41_free_stateid(server, stateid, cred);
2095
2096                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2097                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2098                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2099                 clear_bit(NFS_OPEN_STATE, &state->flags);
2100         }
2101         return status;
2102 }
2103
2104 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2105 {
2106         int status;
2107
2108         nfs41_clear_delegation_stateid(state);
2109         status = nfs41_check_open_stateid(state);
2110         if (status != NFS_OK)
2111                 status = nfs4_open_expired(sp, state);
2112         return status;
2113 }
2114 #endif
2115
2116 /*
2117  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2118  * fields corresponding to attributes that were used to store the verifier.
2119  * Make sure we clobber those fields in the later setattr call
2120  */
2121 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2122 {
2123         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2124             !(sattr->ia_valid & ATTR_ATIME_SET))
2125                 sattr->ia_valid |= ATTR_ATIME;
2126
2127         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2128             !(sattr->ia_valid & ATTR_MTIME_SET))
2129                 sattr->ia_valid |= ATTR_MTIME;
2130 }
2131
2132 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2133                 fmode_t fmode,
2134                 int flags,
2135                 struct nfs_open_context *ctx)
2136 {
2137         struct nfs4_state_owner *sp = opendata->owner;
2138         struct nfs_server *server = sp->so_server;
2139         struct dentry *dentry;
2140         struct nfs4_state *state;
2141         unsigned int seq;
2142         int ret;
2143
2144         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2145
2146         ret = _nfs4_proc_open(opendata);
2147         if (ret != 0)
2148                 goto out;
2149
2150         state = nfs4_opendata_to_nfs4_state(opendata);
2151         ret = PTR_ERR(state);
2152         if (IS_ERR(state))
2153                 goto out;
2154         if (server->caps & NFS_CAP_POSIX_LOCK)
2155                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2156
2157         dentry = opendata->dentry;
2158         if (dentry->d_inode == NULL) {
2159                 /* FIXME: Is this d_drop() ever needed? */
2160                 d_drop(dentry);
2161                 dentry = d_add_unique(dentry, igrab(state->inode));
2162                 if (dentry == NULL) {
2163                         dentry = opendata->dentry;
2164                 } else if (dentry != ctx->dentry) {
2165                         dput(ctx->dentry);
2166                         ctx->dentry = dget(dentry);
2167                 }
2168                 nfs_set_verifier(dentry,
2169                                 nfs_save_change_attribute(opendata->dir->d_inode));
2170         }
2171
2172         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2173         if (ret != 0)
2174                 goto out;
2175
2176         ctx->state = state;
2177         if (dentry->d_inode == state->inode) {
2178                 nfs_inode_attach_open_context(ctx);
2179                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2180                         nfs4_schedule_stateid_recovery(server, state);
2181         }
2182 out:
2183         return ret;
2184 }
2185
2186 /*
2187  * Returns a referenced nfs4_state
2188  */
2189 static int _nfs4_do_open(struct inode *dir,
2190                         struct nfs_open_context *ctx,
2191                         int flags,
2192                         struct iattr *sattr,
2193                         struct nfs4_label *label)
2194 {
2195         struct nfs4_state_owner  *sp;
2196         struct nfs4_state     *state = NULL;
2197         struct nfs_server       *server = NFS_SERVER(dir);
2198         struct nfs4_opendata *opendata;
2199         struct dentry *dentry = ctx->dentry;
2200         struct rpc_cred *cred = ctx->cred;
2201         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2202         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2203         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2204         struct nfs4_label *olabel = NULL;
2205         int status;
2206
2207         /* Protect against reboot recovery conflicts */
2208         status = -ENOMEM;
2209         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2210         if (sp == NULL) {
2211                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2212                 goto out_err;
2213         }
2214         status = nfs4_recover_expired_lease(server);
2215         if (status != 0)
2216                 goto err_put_state_owner;
2217         if (dentry->d_inode != NULL)
2218                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2219         status = -ENOMEM;
2220         if (dentry->d_inode)
2221                 claim = NFS4_OPEN_CLAIM_FH;
2222         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2223                         label, claim, GFP_KERNEL);
2224         if (opendata == NULL)
2225                 goto err_put_state_owner;
2226
2227         if (label) {
2228                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2229                 if (IS_ERR(olabel)) {
2230                         status = PTR_ERR(olabel);
2231                         goto err_opendata_put;
2232                 }
2233         }
2234
2235         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2236                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2237                 if (!opendata->f_attr.mdsthreshold)
2238                         goto err_free_label;
2239                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2240         }
2241         if (dentry->d_inode != NULL)
2242                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2243
2244         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2245         if (status != 0)
2246                 goto err_free_label;
2247         state = ctx->state;
2248
2249         if ((opendata->o_arg.open_flags & O_EXCL) &&
2250             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2251                 nfs4_exclusive_attrset(opendata, sattr);
2252
2253                 nfs_fattr_init(opendata->o_res.f_attr);
2254                 status = nfs4_do_setattr(state->inode, cred,
2255                                 opendata->o_res.f_attr, sattr,
2256                                 state, label, olabel);
2257                 if (status == 0) {
2258                         nfs_setattr_update_inode(state->inode, sattr);
2259                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2260                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2261                 }
2262         }
2263
2264         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2265                 *ctx_th = opendata->f_attr.mdsthreshold;
2266         else
2267                 kfree(opendata->f_attr.mdsthreshold);
2268         opendata->f_attr.mdsthreshold = NULL;
2269
2270         nfs4_label_free(olabel);
2271
2272         nfs4_opendata_put(opendata);
2273         nfs4_put_state_owner(sp);
2274         return 0;
2275 err_free_label:
2276         nfs4_label_free(olabel);
2277 err_opendata_put:
2278         kfree(opendata->f_attr.mdsthreshold);
2279         nfs4_opendata_put(opendata);
2280 err_put_state_owner:
2281         nfs4_put_state_owner(sp);
2282 out_err:
2283         return status;
2284 }
2285
2286
2287 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2288                                         struct nfs_open_context *ctx,
2289                                         int flags,
2290                                         struct iattr *sattr,
2291                                         struct nfs4_label *label)
2292 {
2293         struct nfs_server *server = NFS_SERVER(dir);
2294         struct nfs4_exception exception = { };
2295         struct nfs4_state *res;
2296         int status;
2297
2298         do {
2299                 status = _nfs4_do_open(dir, ctx, flags, sattr, label);
2300                 res = ctx->state;
2301                 trace_nfs4_open_file(ctx, flags, status);
2302                 if (status == 0)
2303                         break;
2304                 /* NOTE: BAD_SEQID means the server and client disagree about the
2305                  * book-keeping w.r.t. state-changing operations
2306                  * (OPEN/CLOSE/LOCK/LOCKU...)
2307                  * It is actually a sign of a bug on the client or on the server.
2308                  *
2309                  * If we receive a BAD_SEQID error in the particular case of
2310                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2311                  * have unhashed the old state_owner for us, and that we can
2312                  * therefore safely retry using a new one. We should still warn
2313                  * the user though...
2314                  */
2315                 if (status == -NFS4ERR_BAD_SEQID) {
2316                         pr_warn_ratelimited("NFS: v4 server %s "
2317                                         " returned a bad sequence-id error!\n",
2318                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2319                         exception.retry = 1;
2320                         continue;
2321                 }
2322                 /*
2323                  * BAD_STATEID on OPEN means that the server cancelled our
2324                  * state before it received the OPEN_CONFIRM.
2325                  * Recover by retrying the request as per the discussion
2326                  * on Page 181 of RFC3530.
2327                  */
2328                 if (status == -NFS4ERR_BAD_STATEID) {
2329                         exception.retry = 1;
2330                         continue;
2331                 }
2332                 if (status == -EAGAIN) {
2333                         /* We must have found a delegation */
2334                         exception.retry = 1;
2335                         continue;
2336                 }
2337                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2338                         continue;
2339                 res = ERR_PTR(nfs4_handle_exception(server,
2340                                         status, &exception));
2341         } while (exception.retry);
2342         return res;
2343 }
2344
2345 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2346                             struct nfs_fattr *fattr, struct iattr *sattr,
2347                             struct nfs4_state *state, struct nfs4_label *ilabel,
2348                             struct nfs4_label *olabel)
2349 {
2350         struct nfs_server *server = NFS_SERVER(inode);
2351         struct nfs_setattrargs  arg = {
2352                 .fh             = NFS_FH(inode),
2353                 .iap            = sattr,
2354                 .server         = server,
2355                 .bitmask = server->attr_bitmask,
2356                 .label          = ilabel,
2357         };
2358         struct nfs_setattrres  res = {
2359                 .fattr          = fattr,
2360                 .label          = olabel,
2361                 .server         = server,
2362         };
2363         struct rpc_message msg = {
2364                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2365                 .rpc_argp       = &arg,
2366                 .rpc_resp       = &res,
2367                 .rpc_cred       = cred,
2368         };
2369         unsigned long timestamp = jiffies;
2370         fmode_t fmode;
2371         bool truncate;
2372         int status;
2373
2374         arg.bitmask = nfs4_bitmask(server, ilabel);
2375         if (ilabel)
2376                 arg.bitmask = nfs4_bitmask(server, olabel);
2377
2378         nfs_fattr_init(fattr);
2379
2380         /* Servers should only apply open mode checks for file size changes */
2381         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2382         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2383
2384         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2385                 /* Use that stateid */
2386         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2387                 struct nfs_lockowner lockowner = {
2388                         .l_owner = current->files,
2389                         .l_pid = current->tgid,
2390                 };
2391                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2392                                 &lockowner);
2393         } else
2394                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2395
2396         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2397         if (status == 0 && state != NULL)
2398                 renew_lease(server, timestamp);
2399         return status;
2400 }
2401
2402 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2403                            struct nfs_fattr *fattr, struct iattr *sattr,
2404                            struct nfs4_state *state, struct nfs4_label *ilabel,
2405                            struct nfs4_label *olabel)
2406 {
2407         struct nfs_server *server = NFS_SERVER(inode);
2408         struct nfs4_exception exception = {
2409                 .state = state,
2410                 .inode = inode,
2411         };
2412         int err;
2413         do {
2414                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2415                 trace_nfs4_setattr(inode, err);
2416                 switch (err) {
2417                 case -NFS4ERR_OPENMODE:
2418                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2419                                 pr_warn_once("NFSv4: server %s is incorrectly "
2420                                                 "applying open mode checks to "
2421                                                 "a SETATTR that is not "
2422                                                 "changing file size.\n",
2423                                                 server->nfs_client->cl_hostname);
2424                         }
2425                         if (state && !(state->state & FMODE_WRITE)) {
2426                                 err = -EBADF;
2427                                 if (sattr->ia_valid & ATTR_OPEN)
2428                                         err = -EACCES;
2429                                 goto out;
2430                         }
2431                 }
2432                 err = nfs4_handle_exception(server, err, &exception);
2433         } while (exception.retry);
2434 out:
2435         return err;
2436 }
2437
2438 struct nfs4_closedata {
2439         struct inode *inode;
2440         struct nfs4_state *state;
2441         struct nfs_closeargs arg;
2442         struct nfs_closeres res;
2443         struct nfs_fattr fattr;
2444         unsigned long timestamp;
2445         bool roc;
2446         u32 roc_barrier;
2447 };
2448
2449 static void nfs4_free_closedata(void *data)
2450 {
2451         struct nfs4_closedata *calldata = data;
2452         struct nfs4_state_owner *sp = calldata->state->owner;
2453         struct super_block *sb = calldata->state->inode->i_sb;
2454
2455         if (calldata->roc)
2456                 pnfs_roc_release(calldata->state->inode);
2457         nfs4_put_open_state(calldata->state);
2458         nfs_free_seqid(calldata->arg.seqid);
2459         nfs4_put_state_owner(sp);
2460         nfs_sb_deactive(sb);
2461         kfree(calldata);
2462 }
2463
2464 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2465                 fmode_t fmode)
2466 {
2467         spin_lock(&state->owner->so_lock);
2468         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2469         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2470         case FMODE_WRITE:
2471                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2472                 break;
2473         case FMODE_READ:
2474                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2475                 break;
2476         case 0:
2477                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2478                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2479                 clear_bit(NFS_OPEN_STATE, &state->flags);
2480         }
2481         spin_unlock(&state->owner->so_lock);
2482 }
2483
2484 static void nfs4_close_done(struct rpc_task *task, void *data)
2485 {
2486         struct nfs4_closedata *calldata = data;
2487         struct nfs4_state *state = calldata->state;
2488         struct nfs_server *server = NFS_SERVER(calldata->inode);
2489
2490         dprintk("%s: begin!\n", __func__);
2491         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2492                 return;
2493         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2494         /* hmm. we are done with the inode, and in the process of freeing
2495          * the state_owner. we keep this around to process errors
2496          */
2497         switch (task->tk_status) {
2498                 case 0:
2499                         if (calldata->roc)
2500                                 pnfs_roc_set_barrier(state->inode,
2501                                                      calldata->roc_barrier);
2502                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2503                         renew_lease(server, calldata->timestamp);
2504                         nfs4_close_clear_stateid_flags(state,
2505                                         calldata->arg.fmode);
2506                         break;
2507                 case -NFS4ERR_STALE_STATEID:
2508                 case -NFS4ERR_OLD_STATEID:
2509                 case -NFS4ERR_BAD_STATEID:
2510                 case -NFS4ERR_EXPIRED:
2511                         if (calldata->arg.fmode == 0)
2512                                 break;
2513                 default:
2514                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2515                                 rpc_restart_call_prepare(task);
2516         }
2517         nfs_release_seqid(calldata->arg.seqid);
2518         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2519         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2520 }
2521
2522 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2523 {
2524         struct nfs4_closedata *calldata = data;
2525         struct nfs4_state *state = calldata->state;
2526         struct inode *inode = calldata->inode;
2527         int call_close = 0;
2528
2529         dprintk("%s: begin!\n", __func__);
2530         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2531                 goto out_wait;
2532
2533         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2534         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2535         spin_lock(&state->owner->so_lock);
2536         /* Calculate the change in open mode */
2537         if (state->n_rdwr == 0) {
2538                 if (state->n_rdonly == 0) {
2539                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2540                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2541                         calldata->arg.fmode &= ~FMODE_READ;
2542                 }
2543                 if (state->n_wronly == 0) {
2544                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2545                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2546                         calldata->arg.fmode &= ~FMODE_WRITE;
2547                 }
2548         }
2549         if (!nfs4_valid_open_stateid(state))
2550                 call_close = 0;
2551         spin_unlock(&state->owner->so_lock);
2552
2553         if (!call_close) {
2554                 /* Note: exit _without_ calling nfs4_close_done */
2555                 goto out_no_action;
2556         }
2557
2558         if (calldata->arg.fmode == 0) {
2559                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2560                 if (calldata->roc &&
2561                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2562                         nfs_release_seqid(calldata->arg.seqid);
2563                         goto out_wait;
2564                     }
2565         }
2566
2567         nfs_fattr_init(calldata->res.fattr);
2568         calldata->timestamp = jiffies;
2569         if (nfs4_setup_sequence(NFS_SERVER(inode),
2570                                 &calldata->arg.seq_args,
2571                                 &calldata->res.seq_res,
2572                                 task) != 0)
2573                 nfs_release_seqid(calldata->arg.seqid);
2574         dprintk("%s: done!\n", __func__);
2575         return;
2576 out_no_action:
2577         task->tk_action = NULL;
2578 out_wait:
2579         nfs4_sequence_done(task, &calldata->res.seq_res);
2580 }
2581
2582 static const struct rpc_call_ops nfs4_close_ops = {
2583         .rpc_call_prepare = nfs4_close_prepare,
2584         .rpc_call_done = nfs4_close_done,
2585         .rpc_release = nfs4_free_closedata,
2586 };
2587
2588 /*
2589  * It is possible for data to be read/written from a mem-mapped file
2590  * after the sys_close call (which hits the vfs layer as a flush).
2591  * This means that we can't safely call nfsv4 close on a file until
2592  * the inode is cleared. This in turn means that we are not good
2593  * NFSv4 citizens - we do not indicate to the server to update the file's
2594  * share state even when we are done with one of the three share
2595  * stateid's in the inode.
2596  *
2597  * NOTE: Caller must be holding the sp->so_owner semaphore!
2598  */
2599 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2600 {
2601         struct nfs_server *server = NFS_SERVER(state->inode);
2602         struct nfs4_closedata *calldata;
2603         struct nfs4_state_owner *sp = state->owner;
2604         struct rpc_task *task;
2605         struct rpc_message msg = {
2606                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2607                 .rpc_cred = state->owner->so_cred,
2608         };
2609         struct rpc_task_setup task_setup_data = {
2610                 .rpc_client = server->client,
2611                 .rpc_message = &msg,
2612                 .callback_ops = &nfs4_close_ops,
2613                 .workqueue = nfsiod_workqueue,
2614                 .flags = RPC_TASK_ASYNC,
2615         };
2616         int status = -ENOMEM;
2617
2618         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2619         if (calldata == NULL)
2620                 goto out;
2621         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2622         calldata->inode = state->inode;
2623         calldata->state = state;
2624         calldata->arg.fh = NFS_FH(state->inode);
2625         calldata->arg.stateid = &state->open_stateid;
2626         /* Serialization for the sequence id */
2627         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2628         if (calldata->arg.seqid == NULL)
2629                 goto out_free_calldata;
2630         calldata->arg.fmode = 0;
2631         calldata->arg.bitmask = server->cache_consistency_bitmask;
2632         calldata->res.fattr = &calldata->fattr;
2633         calldata->res.seqid = calldata->arg.seqid;
2634         calldata->res.server = server;
2635         calldata->roc = pnfs_roc(state->inode);
2636         nfs_sb_active(calldata->inode->i_sb);
2637
2638         msg.rpc_argp = &calldata->arg;
2639         msg.rpc_resp = &calldata->res;
2640         task_setup_data.callback_data = calldata;
2641         task = rpc_run_task(&task_setup_data);
2642         if (IS_ERR(task))
2643                 return PTR_ERR(task);
2644         status = 0;
2645         if (wait)
2646                 status = rpc_wait_for_completion_task(task);
2647         rpc_put_task(task);
2648         return status;
2649 out_free_calldata:
2650         kfree(calldata);
2651 out:
2652         nfs4_put_open_state(state);
2653         nfs4_put_state_owner(sp);
2654         return status;
2655 }
2656
2657 static struct inode *
2658 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2659 {
2660         struct nfs4_state *state;
2661         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2662
2663         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2664
2665         /* Protect against concurrent sillydeletes */
2666         state = nfs4_do_open(dir, ctx, open_flags, attr, label);
2667
2668         nfs4_label_release_security(label);
2669
2670         if (IS_ERR(state))
2671                 return ERR_CAST(state);
2672         return state->inode;
2673 }
2674
2675 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2676 {
2677         if (ctx->state == NULL)
2678                 return;
2679         if (is_sync)
2680                 nfs4_close_sync(ctx->state, ctx->mode);
2681         else
2682                 nfs4_close_state(ctx->state, ctx->mode);
2683 }
2684
2685 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2686 {
2687         struct nfs4_server_caps_arg args = {
2688                 .fhandle = fhandle,
2689         };
2690         struct nfs4_server_caps_res res = {};
2691         struct rpc_message msg = {
2692                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2693                 .rpc_argp = &args,
2694                 .rpc_resp = &res,
2695         };
2696         int status;
2697
2698         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2699         if (status == 0) {
2700                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2701                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2702                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2703                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2704                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2705                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2706                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2707                         server->caps |= NFS_CAP_ACLS;
2708                 if (res.has_links != 0)
2709                         server->caps |= NFS_CAP_HARDLINKS;
2710                 if (res.has_symlinks != 0)
2711                         server->caps |= NFS_CAP_SYMLINKS;
2712                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2713                         server->caps |= NFS_CAP_FILEID;
2714                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2715                         server->caps |= NFS_CAP_MODE;
2716                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2717                         server->caps |= NFS_CAP_NLINK;
2718                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2719                         server->caps |= NFS_CAP_OWNER;
2720                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2721                         server->caps |= NFS_CAP_OWNER_GROUP;
2722                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2723                         server->caps |= NFS_CAP_ATIME;
2724                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2725                         server->caps |= NFS_CAP_CTIME;
2726                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2727                         server->caps |= NFS_CAP_MTIME;
2728 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2729                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2730                         server->caps |= NFS_CAP_SECURITY_LABEL;
2731 #endif
2732                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2733                                 sizeof(server->attr_bitmask));
2734
2735                 if (server->caps & NFS_CAP_SECURITY_LABEL) {
2736                         server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2737                         res.attr_bitmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2738                 }
2739                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2740                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2741                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2742                 server->acl_bitmask = res.acl_bitmask;
2743                 server->fh_expire_type = res.fh_expire_type;
2744         }
2745
2746         return status;
2747 }
2748
2749 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2750 {
2751         struct nfs4_exception exception = { };
2752         int err;
2753         do {
2754                 err = nfs4_handle_exception(server,
2755                                 _nfs4_server_capabilities(server, fhandle),
2756                                 &exception);
2757         } while (exception.retry);
2758         return err;
2759 }
2760
2761 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2762                 struct nfs_fsinfo *info)
2763 {
2764         u32 bitmask[3];
2765         struct nfs4_lookup_root_arg args = {
2766                 .bitmask = bitmask,
2767         };
2768         struct nfs4_lookup_res res = {
2769                 .server = server,
2770                 .fattr = info->fattr,
2771                 .fh = fhandle,
2772         };
2773         struct rpc_message msg = {
2774                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2775                 .rpc_argp = &args,
2776                 .rpc_resp = &res,
2777         };
2778
2779         bitmask[0] = nfs4_fattr_bitmap[0];
2780         bitmask[1] = nfs4_fattr_bitmap[1];
2781         /*
2782          * Process the label in the upcoming getfattr
2783          */
2784         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2785
2786         nfs_fattr_init(info->fattr);
2787         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2788 }
2789
2790 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2791                 struct nfs_fsinfo *info)
2792 {
2793         struct nfs4_exception exception = { };
2794         int err;
2795         do {
2796                 err = _nfs4_lookup_root(server, fhandle, info);
2797                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2798                 switch (err) {
2799                 case 0:
2800                 case -NFS4ERR_WRONGSEC:
2801                         goto out;
2802                 default:
2803                         err = nfs4_handle_exception(server, err, &exception);
2804                 }
2805         } while (exception.retry);
2806 out:
2807         return err;
2808 }
2809
2810 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2811                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2812 {
2813         struct rpc_auth_create_args auth_args = {
2814                 .pseudoflavor = flavor,
2815         };
2816         struct rpc_auth *auth;
2817         int ret;
2818
2819         auth = rpcauth_create(&auth_args, server->client);
2820         if (IS_ERR(auth)) {
2821                 ret = -EACCES;
2822                 goto out;
2823         }
2824         ret = nfs4_lookup_root(server, fhandle, info);
2825 out:
2826         return ret;
2827 }
2828
2829 /*
2830  * Retry pseudoroot lookup with various security flavors.  We do this when:
2831  *
2832  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2833  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2834  *
2835  * Returns zero on success, or a negative NFS4ERR value, or a
2836  * negative errno value.
2837  */
2838 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2839                               struct nfs_fsinfo *info)
2840 {
2841         /* Per 3530bis 15.33.5 */
2842         static const rpc_authflavor_t flav_array[] = {
2843                 RPC_AUTH_GSS_KRB5P,
2844                 RPC_AUTH_GSS_KRB5I,
2845                 RPC_AUTH_GSS_KRB5,
2846                 RPC_AUTH_UNIX,                  /* courtesy */
2847                 RPC_AUTH_NULL,
2848         };
2849         int status = -EPERM;
2850         size_t i;
2851
2852         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2853                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2854                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2855                         continue;
2856                 break;
2857         }
2858
2859         /*
2860          * -EACCESS could mean that the user doesn't have correct permissions
2861          * to access the mount.  It could also mean that we tried to mount
2862          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2863          * existing mount programs don't handle -EACCES very well so it should
2864          * be mapped to -EPERM instead.
2865          */
2866         if (status == -EACCES)
2867                 status = -EPERM;
2868         return status;
2869 }
2870
2871 static int nfs4_do_find_root_sec(struct nfs_server *server,
2872                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2873 {
2874         int mv = server->nfs_client->cl_minorversion;
2875         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2876 }
2877
2878 /**
2879  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2880  * @server: initialized nfs_server handle
2881  * @fhandle: we fill in the pseudo-fs root file handle
2882  * @info: we fill in an FSINFO struct
2883  *
2884  * Returns zero on success, or a negative errno.
2885  */
2886 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2887                          struct nfs_fsinfo *info)
2888 {
2889         int status;
2890
2891         status = nfs4_lookup_root(server, fhandle, info);
2892         if ((status == -NFS4ERR_WRONGSEC) &&
2893             !(server->flags & NFS_MOUNT_SECFLAVOUR))
2894                 status = nfs4_do_find_root_sec(server, fhandle, info);
2895
2896         if (status == 0)
2897                 status = nfs4_server_capabilities(server, fhandle);
2898         if (status == 0)
2899                 status = nfs4_do_fsinfo(server, fhandle, info);
2900
2901         return nfs4_map_errors(status);
2902 }
2903
2904 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2905                               struct nfs_fsinfo *info)
2906 {
2907         int error;
2908         struct nfs_fattr *fattr = info->fattr;
2909         struct nfs4_label *label = NULL;
2910
2911         error = nfs4_server_capabilities(server, mntfh);
2912         if (error < 0) {
2913                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2914                 return error;
2915         }
2916
2917         label = nfs4_label_alloc(server, GFP_KERNEL);
2918         if (IS_ERR(label))
2919                 return PTR_ERR(label);
2920
2921         error = nfs4_proc_getattr(server, mntfh, fattr, label);
2922         if (error < 0) {
2923                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2924                 goto err_free_label;
2925         }
2926
2927         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2928             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2929                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2930
2931 err_free_label:
2932         nfs4_label_free(label);
2933
2934         return error;
2935 }
2936
2937 /*
2938  * Get locations and (maybe) other attributes of a referral.
2939  * Note that we'll actually follow the referral later when
2940  * we detect fsid mismatch in inode revalidation
2941  */
2942 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2943                              const struct qstr *name, struct nfs_fattr *fattr,
2944                              struct nfs_fh *fhandle)
2945 {
2946         int status = -ENOMEM;
2947         struct page *page = NULL;
2948         struct nfs4_fs_locations *locations = NULL;
2949
2950         page = alloc_page(GFP_KERNEL);
2951         if (page == NULL)
2952                 goto out;
2953         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2954         if (locations == NULL)
2955                 goto out;
2956
2957         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2958         if (status != 0)
2959                 goto out;
2960         /* Make sure server returned a different fsid for the referral */
2961         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2962                 dprintk("%s: server did not return a different fsid for"
2963                         " a referral at %s\n", __func__, name->name);
2964                 status = -EIO;
2965                 goto out;
2966         }
2967         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2968         nfs_fixup_referral_attributes(&locations->fattr);
2969
2970         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2971         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2972         memset(fhandle, 0, sizeof(struct nfs_fh));
2973 out:
2974         if (page)
2975                 __free_page(page);
2976         kfree(locations);
2977         return status;
2978 }
2979
2980 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
2981                                 struct nfs_fattr *fattr, struct nfs4_label *label)
2982 {
2983         struct nfs4_getattr_arg args = {
2984                 .fh = fhandle,
2985                 .bitmask = server->attr_bitmask,
2986         };
2987         struct nfs4_getattr_res res = {
2988                 .fattr = fattr,
2989                 .label = label,
2990                 .server = server,
2991         };
2992         struct rpc_message msg = {
2993                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2994                 .rpc_argp = &args,
2995                 .rpc_resp = &res,
2996         };
2997
2998         args.bitmask = nfs4_bitmask(server, label);
2999
3000         nfs_fattr_init(fattr);
3001         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3002 }
3003
3004 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3005                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3006 {
3007         struct nfs4_exception exception = { };
3008         int err;
3009         do {
3010                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3011                 trace_nfs4_getattr(server, fhandle, fattr, err);
3012                 err = nfs4_handle_exception(server, err,
3013                                 &exception);
3014         } while (exception.retry);
3015         return err;
3016 }
3017
3018 /*
3019  * The file is not closed if it is opened due to the a request to change
3020  * the size of the file. The open call will not be needed once the
3021  * VFS layer lookup-intents are implemented.
3022  *
3023  * Close is called when the inode is destroyed.
3024  * If we haven't opened the file for O_WRONLY, we
3025  * need to in the size_change case to obtain a stateid.
3026  *
3027  * Got race?
3028  * Because OPEN is always done by name in nfsv4, it is
3029  * possible that we opened a different file by the same
3030  * name.  We can recognize this race condition, but we
3031  * can't do anything about it besides returning an error.
3032  *
3033  * This will be fixed with VFS changes (lookup-intent).
3034  */
3035 static int
3036 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3037                   struct iattr *sattr)
3038 {
3039         struct inode *inode = dentry->d_inode;
3040         struct rpc_cred *cred = NULL;
3041         struct nfs4_state *state = NULL;
3042         struct nfs4_label *label = NULL;
3043         int status;
3044
3045         if (pnfs_ld_layoutret_on_setattr(inode))
3046                 pnfs_commit_and_return_layout(inode);
3047
3048         nfs_fattr_init(fattr);
3049
3050         /* Deal with open(O_TRUNC) */
3051         if (sattr->ia_valid & ATTR_OPEN)
3052                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3053
3054         /* Optimization: if the end result is no change, don't RPC */
3055         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3056                 return 0;
3057
3058         /* Search for an existing open(O_WRITE) file */
3059         if (sattr->ia_valid & ATTR_FILE) {
3060                 struct nfs_open_context *ctx;
3061
3062                 ctx = nfs_file_open_context(sattr->ia_file);
3063                 if (ctx) {
3064                         cred = ctx->cred;
3065                         state = ctx->state;
3066                 }
3067         }
3068
3069         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3070         if (IS_ERR(label))
3071                 return PTR_ERR(label);
3072
3073         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3074         if (status == 0) {
3075                 nfs_setattr_update_inode(inode, sattr);
3076                 nfs_setsecurity(inode, fattr, label);
3077         }
3078         nfs4_label_free(label);
3079         return status;
3080 }
3081
3082 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3083                 const struct qstr *name, struct nfs_fh *fhandle,
3084                 struct nfs_fattr *fattr, struct nfs4_label *label)
3085 {
3086         struct nfs_server *server = NFS_SERVER(dir);
3087         int                    status;
3088         struct nfs4_lookup_arg args = {
3089                 .bitmask = server->attr_bitmask,
3090                 .dir_fh = NFS_FH(dir),
3091                 .name = name,
3092         };
3093         struct nfs4_lookup_res res = {
3094                 .server = server,
3095                 .fattr = fattr,
3096                 .label = label,
3097                 .fh = fhandle,
3098         };
3099         struct rpc_message msg = {
3100                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3101                 .rpc_argp = &args,
3102                 .rpc_resp = &res,
3103         };
3104
3105         args.bitmask = nfs4_bitmask(server, label);
3106
3107         nfs_fattr_init(fattr);
3108
3109         dprintk("NFS call  lookup %s\n", name->name);
3110         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3111         dprintk("NFS reply lookup: %d\n", status);
3112         return status;
3113 }
3114
3115 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3116 {
3117         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3118                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3119         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3120         fattr->nlink = 2;
3121 }
3122
3123 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3124                                    struct qstr *name, struct nfs_fh *fhandle,
3125                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3126 {
3127         struct nfs4_exception exception = { };
3128         struct rpc_clnt *client = *clnt;
3129         int err;
3130         do {
3131                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3132                 trace_nfs4_lookup(dir, name, err);
3133                 switch (err) {
3134                 case -NFS4ERR_BADNAME:
3135                         err = -ENOENT;
3136                         goto out;
3137                 case -NFS4ERR_MOVED:
3138                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3139                         goto out;
3140                 case -NFS4ERR_WRONGSEC:
3141                         err = -EPERM;
3142                         if (client != *clnt)
3143                                 goto out;
3144
3145                         client = nfs4_create_sec_client(client, dir, name);
3146                         if (IS_ERR(client))
3147                                 return PTR_ERR(client);
3148
3149                         exception.retry = 1;
3150                         break;
3151                 default:
3152                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3153                 }
3154         } while (exception.retry);
3155
3156 out:
3157         if (err == 0)
3158                 *clnt = client;
3159         else if (client != *clnt)
3160                 rpc_shutdown_client(client);
3161
3162         return err;
3163 }
3164
3165 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3166                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3167                             struct nfs4_label *label)
3168 {
3169         int status;
3170         struct rpc_clnt *client = NFS_CLIENT(dir);
3171
3172         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3173         if (client != NFS_CLIENT(dir)) {
3174                 rpc_shutdown_client(client);
3175                 nfs_fixup_secinfo_attributes(fattr);
3176         }
3177         return status;
3178 }
3179
3180 struct rpc_clnt *
3181 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3182                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3183 {
3184         int status;
3185         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
3186
3187         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3188         if (status < 0) {
3189                 rpc_shutdown_client(client);
3190                 return ERR_PTR(status);
3191         }
3192         return client;
3193 }
3194
3195 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3196 {
3197         struct nfs_server *server = NFS_SERVER(inode);
3198         struct nfs4_accessargs args = {
3199                 .fh = NFS_FH(inode),
3200                 .bitmask = server->cache_consistency_bitmask,
3201         };
3202         struct nfs4_accessres res = {
3203                 .server = server,
3204         };
3205         struct rpc_message msg = {
3206                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3207                 .rpc_argp = &args,
3208                 .rpc_resp = &res,
3209                 .rpc_cred = entry->cred,
3210         };
3211         int mode = entry->mask;
3212         int status = 0;
3213
3214         /*
3215          * Determine which access bits we want to ask for...
3216          */
3217         if (mode & MAY_READ)
3218                 args.access |= NFS4_ACCESS_READ;
3219         if (S_ISDIR(inode->i_mode)) {
3220                 if (mode & MAY_WRITE)
3221                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3222                 if (mode & MAY_EXEC)
3223                         args.access |= NFS4_ACCESS_LOOKUP;
3224         } else {
3225                 if (mode & MAY_WRITE)
3226                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3227                 if (mode & MAY_EXEC)
3228                         args.access |= NFS4_ACCESS_EXECUTE;
3229         }
3230
3231         res.fattr = nfs_alloc_fattr();
3232         if (res.fattr == NULL)
3233                 return -ENOMEM;
3234
3235         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3236         if (!status) {
3237                 nfs_access_set_mask(entry, res.access);
3238                 nfs_refresh_inode(inode, res.fattr);
3239         }
3240         nfs_free_fattr(res.fattr);
3241         return status;
3242 }
3243
3244 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3245 {
3246         struct nfs4_exception exception = { };
3247         int err;
3248         do {
3249                 err = _nfs4_proc_access(inode, entry);
3250                 trace_nfs4_access(inode, err);
3251                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3252                                 &exception);
3253         } while (exception.retry);
3254         return err;
3255 }
3256
3257 /*
3258  * TODO: For the time being, we don't try to get any attributes
3259  * along with any of the zero-copy operations READ, READDIR,
3260  * READLINK, WRITE.
3261  *
3262  * In the case of the first three, we want to put the GETATTR
3263  * after the read-type operation -- this is because it is hard
3264  * to predict the length of a GETATTR response in v4, and thus
3265  * align the READ data correctly.  This means that the GETATTR
3266  * may end up partially falling into the page cache, and we should
3267  * shift it into the 'tail' of the xdr_buf before processing.
3268  * To do this efficiently, we need to know the total length
3269  * of data received, which doesn't seem to be available outside
3270  * of the RPC layer.
3271  *
3272  * In the case of WRITE, we also want to put the GETATTR after
3273  * the operation -- in this case because we want to make sure
3274  * we get the post-operation mtime and size.
3275  *
3276  * Both of these changes to the XDR layer would in fact be quite
3277  * minor, but I decided to leave them for a subsequent patch.
3278  */
3279 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3280                 unsigned int pgbase, unsigned int pglen)
3281 {
3282         struct nfs4_readlink args = {
3283                 .fh       = NFS_FH(inode),
3284                 .pgbase   = pgbase,
3285                 .pglen    = pglen,
3286                 .pages    = &page,
3287         };
3288         struct nfs4_readlink_res res;
3289         struct rpc_message msg = {
3290                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3291                 .rpc_argp = &args,
3292                 .rpc_resp = &res,
3293         };
3294
3295         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3296 }
3297
3298 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3299                 unsigned int pgbase, unsigned int pglen)
3300 {
3301         struct nfs4_exception exception = { };
3302         int err;
3303         do {
3304                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3305                 trace_nfs4_readlink(inode, err);
3306                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3307                                 &exception);
3308         } while (exception.retry);
3309         return err;
3310 }
3311
3312 /*
3313  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3314  */
3315 static int
3316 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3317                  int flags)
3318 {
3319         struct nfs4_label l, *ilabel = NULL;
3320         struct nfs_open_context *ctx;
3321         struct nfs4_state *state;
3322         int status = 0;
3323
3324         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3325         if (IS_ERR(ctx))
3326                 return PTR_ERR(ctx);
3327
3328         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3329
3330         sattr->ia_mode &= ~current_umask();
3331         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel);
3332         if (IS_ERR(state)) {
3333                 status = PTR_ERR(state);
3334                 goto out;
3335         }
3336 out:
3337         nfs4_label_release_security(ilabel);
3338         put_nfs_open_context(ctx);
3339         return status;
3340 }
3341
3342 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3343 {
3344         struct nfs_server *server = NFS_SERVER(dir);
3345         struct nfs_removeargs args = {
3346                 .fh = NFS_FH(dir),
3347                 .name = *name,
3348         };
3349         struct nfs_removeres res = {
3350                 .server = server,
3351         };
3352         struct rpc_message msg = {
3353                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3354                 .rpc_argp = &args,
3355                 .rpc_resp = &res,
3356         };
3357         int status;
3358
3359         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3360         if (status == 0)
3361                 update_changeattr(dir, &res.cinfo);
3362         return status;
3363 }
3364
3365 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3366 {
3367         struct nfs4_exception exception = { };
3368         int err;
3369         do {
3370                 err = _nfs4_proc_remove(dir, name);
3371                 trace_nfs4_remove(dir, name, err);
3372                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3373                                 &exception);
3374         } while (exception.retry);
3375         return err;
3376 }
3377
3378 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3379 {
3380         struct nfs_server *server = NFS_SERVER(dir);
3381         struct nfs_removeargs *args = msg->rpc_argp;
3382         struct nfs_removeres *res = msg->rpc_resp;
3383
3384         res->server = server;
3385         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3386         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3387
3388         nfs_fattr_init(res->dir_attr);
3389 }
3390
3391 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3392 {
3393         nfs4_setup_sequence(NFS_SERVER(data->dir),
3394                         &data->args.seq_args,
3395                         &data->res.seq_res,
3396                         task);
3397 }
3398
3399 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3400 {
3401         struct nfs_unlinkdata *data = task->tk_calldata;
3402         struct nfs_removeres *res = &data->res;
3403
3404         if (!nfs4_sequence_done(task, &res->seq_res))
3405                 return 0;
3406         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3407                 return 0;
3408         update_changeattr(dir, &res->cinfo);
3409         return 1;
3410 }
3411
3412 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3413 {
3414         struct nfs_server *server = NFS_SERVER(dir);
3415         struct nfs_renameargs *arg = msg->rpc_argp;
3416         struct nfs_renameres *res = msg->rpc_resp;
3417
3418         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3419         res->server = server;
3420         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3421 }
3422
3423 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3424 {
3425         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3426                         &data->args.seq_args,
3427                         &data->res.seq_res,
3428                         task);
3429 }
3430
3431 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3432                                  struct inode *new_dir)
3433 {
3434         struct nfs_renamedata *data = task->tk_calldata;
3435         struct nfs_renameres *res = &data->res;
3436
3437         if (!nfs4_sequence_done(task, &res->seq_res))
3438                 return 0;
3439         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3440                 return 0;
3441
3442         update_changeattr(old_dir, &res->old_cinfo);
3443         update_changeattr(new_dir, &res->new_cinfo);
3444         return 1;
3445 }
3446
3447 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3448                 struct inode *new_dir, struct qstr *new_name)
3449 {
3450         struct nfs_server *server = NFS_SERVER(old_dir);
3451         struct nfs_renameargs arg = {
3452                 .old_dir = NFS_FH(old_dir),
3453                 .new_dir = NFS_FH(new_dir),
3454                 .old_name = old_name,
3455                 .new_name = new_name,
3456         };
3457         struct nfs_renameres res = {
3458                 .server = server,
3459         };
3460         struct rpc_message msg = {
3461                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3462                 .rpc_argp = &arg,
3463                 .rpc_resp = &res,
3464         };
3465         int status = -ENOMEM;
3466
3467         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3468         if (!status) {
3469                 update_changeattr(old_dir, &res.old_cinfo);
3470                 update_changeattr(new_dir, &res.new_cinfo);
3471         }
3472         return status;
3473 }
3474
3475 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3476                 struct inode *new_dir, struct qstr *new_name)
3477 {
3478         struct nfs4_exception exception = { };
3479         int err;
3480         do {
3481                 err = _nfs4_proc_rename(old_dir, old_name,
3482                                         new_dir, new_name);
3483                 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3484                 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3485                                 &exception);
3486         } while (exception.retry);
3487         return err;
3488 }
3489
3490 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3491 {
3492         struct nfs_server *server = NFS_SERVER(inode);
3493         struct nfs4_link_arg arg = {
3494                 .fh     = NFS_FH(inode),
3495                 .dir_fh = NFS_FH(dir),
3496                 .name   = name,
3497                 .bitmask = server->attr_bitmask,
3498         };
3499         struct nfs4_link_res res = {
3500                 .server = server,
3501                 .label = NULL,
3502         };
3503         struct rpc_message msg = {
3504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3505                 .rpc_argp = &arg,
3506                 .rpc_resp = &res,
3507         };
3508         int status = -ENOMEM;
3509
3510         res.fattr = nfs_alloc_fattr();
3511         if (res.fattr == NULL)
3512                 goto out;
3513
3514         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3515         if (IS_ERR(res.label)) {
3516                 status = PTR_ERR(res.label);
3517                 goto out;
3518         }
3519         arg.bitmask = nfs4_bitmask(server, res.label);
3520
3521         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3522         if (!status) {
3523                 update_changeattr(dir, &res.cinfo);
3524                 status = nfs_post_op_update_inode(inode, res.fattr);
3525                 if (!status)
3526                         nfs_setsecurity(inode, res.fattr, res.label);
3527         }
3528
3529
3530         nfs4_label_free(res.label);
3531
3532 out:
3533         nfs_free_fattr(res.fattr);
3534         return status;
3535 }
3536
3537 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3538 {
3539         struct nfs4_exception exception = { };
3540         int err;
3541         do {
3542                 err = nfs4_handle_exception(NFS_SERVER(inode),
3543                                 _nfs4_proc_link(inode, dir, name),
3544                                 &exception);
3545         } while (exception.retry);
3546         return err;
3547 }
3548
3549 struct nfs4_createdata {
3550         struct rpc_message msg;
3551         struct nfs4_create_arg arg;
3552         struct nfs4_create_res res;
3553         struct nfs_fh fh;
3554         struct nfs_fattr fattr;
3555         struct nfs4_label *label;
3556 };
3557
3558 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3559                 struct qstr *name, struct iattr *sattr, u32 ftype)
3560 {
3561         struct nfs4_createdata *data;
3562
3563         data = kzalloc(sizeof(*data), GFP_KERNEL);
3564         if (data != NULL) {
3565                 struct nfs_server *server = NFS_SERVER(dir);
3566
3567                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3568                 if (IS_ERR(data->label))
3569                         goto out_free;
3570
3571                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3572                 data->msg.rpc_argp = &data->arg;
3573                 data->msg.rpc_resp = &data->res;
3574                 data->arg.dir_fh = NFS_FH(dir);
3575                 data->arg.server = server;
3576                 data->arg.name = name;
3577                 data->arg.attrs = sattr;
3578                 data->arg.ftype = ftype;
3579                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3580                 data->res.server = server;
3581                 data->res.fh = &data->fh;
3582                 data->res.fattr = &data->fattr;
3583                 data->res.label = data->label;
3584                 nfs_fattr_init(data->res.fattr);
3585         }
3586         return data;
3587 out_free:
3588         kfree(data);
3589         return NULL;
3590 }
3591
3592 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3593 {
3594         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3595                                     &data->arg.seq_args, &data->res.seq_res, 1);
3596         if (status == 0) {
3597                 update_changeattr(dir, &data->res.dir_cinfo);
3598                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3599         }
3600         return status;
3601 }
3602
3603 static void nfs4_free_createdata(struct nfs4_createdata *data)
3604 {
3605         nfs4_label_free(data->label);
3606         kfree(data);
3607 }
3608
3609 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3610                 struct page *page, unsigned int len, struct iattr *sattr,
3611                 struct nfs4_label *label)
3612 {
3613         struct nfs4_createdata *data;
3614         int status = -ENAMETOOLONG;
3615
3616         if (len > NFS4_MAXPATHLEN)
3617                 goto out;
3618
3619         status = -ENOMEM;
3620         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3621         if (data == NULL)
3622                 goto out;
3623
3624         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3625         data->arg.u.symlink.pages = &page;
3626         data->arg.u.symlink.len = len;
3627         data->arg.label = label;
3628
3629         status = nfs4_do_create(dir, dentry, data);
3630
3631         nfs4_free_createdata(data);
3632 out:
3633         return status;
3634 }
3635
3636 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3637                 struct page *page, unsigned int len, struct iattr *sattr)
3638 {
3639         struct nfs4_exception exception = { };
3640         struct nfs4_label l, *label = NULL;
3641         int err;
3642
3643         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3644
3645         do {
3646                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3647                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3648                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3649                                 &exception);
3650         } while (exception.retry);
3651
3652         nfs4_label_release_security(label);
3653         return err;
3654 }
3655
3656 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3657                 struct iattr *sattr, struct nfs4_label *label)
3658 {
3659         struct nfs4_createdata *data;
3660         int status = -ENOMEM;
3661
3662         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3663         if (data == NULL)
3664                 goto out;
3665
3666         data->arg.label = label;
3667         status = nfs4_do_create(dir, dentry, data);
3668
3669         nfs4_free_createdata(data);
3670 out:
3671         return status;
3672 }
3673
3674 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3675                 struct iattr *sattr)
3676 {
3677         struct nfs4_exception exception = { };
3678         struct nfs4_label l, *label = NULL;
3679         int err;
3680
3681         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3682
3683         sattr->ia_mode &= ~current_umask();
3684         do {
3685                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3686                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3687                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3688                                 &exception);
3689         } while (exception.retry);
3690         nfs4_label_release_security(label);
3691
3692         return err;
3693 }
3694
3695 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3696                 u64 cookie, struct page **pages, unsigned int count, int plus)
3697 {
3698         struct inode            *dir = dentry->d_inode;
3699         struct nfs4_readdir_arg args = {
3700                 .fh = NFS_FH(dir),
3701                 .pages = pages,
3702                 .pgbase = 0,
3703                 .count = count,
3704                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3705                 .plus = plus,
3706         };
3707         struct nfs4_readdir_res res;
3708         struct rpc_message msg = {
3709                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3710                 .rpc_argp = &args,
3711                 .rpc_resp = &res,
3712                 .rpc_cred = cred,
3713         };
3714         int                     status;
3715
3716         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3717                         dentry->d_parent->d_name.name,
3718                         dentry->d_name.name,
3719                         (unsigned long long)cookie);
3720         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3721         res.pgbase = args.pgbase;
3722         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3723         if (status >= 0) {
3724                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3725                 status += args.pgbase;
3726         }
3727
3728         nfs_invalidate_atime(dir);
3729
3730         dprintk("%s: returns %d\n", __func__, status);
3731         return status;
3732 }
3733
3734 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3735                 u64 cookie, struct page **pages, unsigned int count, int plus)
3736 {
3737         struct nfs4_exception exception = { };
3738         int err;
3739         do {
3740                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3741                                 pages, count, plus);
3742                 trace_nfs4_readdir(dentry->d_inode, err);
3743                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3744                                 &exception);
3745         } while (exception.retry);
3746         return err;
3747 }
3748
3749 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3750                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3751 {
3752         struct nfs4_createdata *data;
3753         int mode = sattr->ia_mode;
3754         int status = -ENOMEM;
3755
3756         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3757         if (data == NULL)
3758                 goto out;
3759
3760         if (S_ISFIFO(mode))
3761                 data->arg.ftype = NF4FIFO;
3762         else if (S_ISBLK(mode)) {
3763                 data->arg.ftype = NF4BLK;
3764                 data->arg.u.device.specdata1 = MAJOR(rdev);
3765                 data->arg.u.device.specdata2 = MINOR(rdev);
3766         }
3767         else if (S_ISCHR(mode)) {
3768                 data->arg.ftype = NF4CHR;
3769                 data->arg.u.device.specdata1 = MAJOR(rdev);
3770                 data->arg.u.device.specdata2 = MINOR(rdev);
3771         } else if (!S_ISSOCK(mode)) {
3772                 status = -EINVAL;
3773                 goto out_free;
3774         }
3775
3776         data->arg.label = label;
3777         status = nfs4_do_create(dir, dentry, data);
3778 out_free:
3779         nfs4_free_createdata(data);
3780 out:
3781         return status;
3782 }
3783
3784 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3785                 struct iattr *sattr, dev_t rdev)
3786 {
3787         struct nfs4_exception exception = { };
3788         struct nfs4_label l, *label = NULL;
3789         int err;
3790
3791         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3792
3793         sattr->ia_mode &= ~current_umask();
3794         do {
3795                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3796                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3797                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3798                                 &exception);
3799         } while (exception.retry);
3800
3801         nfs4_label_release_security(label);
3802
3803         return err;
3804 }
3805
3806 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3807                  struct nfs_fsstat *fsstat)
3808 {
3809         struct nfs4_statfs_arg args = {
3810                 .fh = fhandle,
3811                 .bitmask = server->attr_bitmask,
3812         };
3813         struct nfs4_statfs_res res = {
3814                 .fsstat = fsstat,
3815         };
3816         struct rpc_message msg = {
3817                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3818                 .rpc_argp = &args,
3819                 .rpc_resp = &res,
3820         };
3821
3822         nfs_fattr_init(fsstat->fattr);
3823         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3824 }
3825
3826 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3827 {
3828         struct nfs4_exception exception = { };
3829         int err;
3830         do {
3831                 err = nfs4_handle_exception(server,
3832                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3833                                 &exception);
3834         } while (exception.retry);
3835         return err;
3836 }
3837
3838 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3839                 struct nfs_fsinfo *fsinfo)
3840 {
3841         struct nfs4_fsinfo_arg args = {
3842                 .fh = fhandle,
3843                 .bitmask = server->attr_bitmask,
3844         };
3845         struct nfs4_fsinfo_res res = {
3846                 .fsinfo = fsinfo,
3847         };
3848         struct rpc_message msg = {
3849                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3850                 .rpc_argp = &args,
3851                 .rpc_resp = &res,
3852         };
3853
3854         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3855 }
3856
3857 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3858 {
3859         struct nfs4_exception exception = { };
3860         unsigned long now = jiffies;
3861         int err;
3862
3863         do {
3864                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3865                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3866                 if (err == 0) {
3867                         struct nfs_client *clp = server->nfs_client;
3868
3869                         spin_lock(&clp->cl_lock);
3870                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3871                         clp->cl_last_renewal = now;
3872                         spin_unlock(&clp->cl_lock);
3873                         break;
3874                 }
3875                 err = nfs4_handle_exception(server, err, &exception);
3876         } while (exception.retry);
3877         return err;
3878 }
3879
3880 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3881 {
3882         int error;
3883
3884         nfs_fattr_init(fsinfo->fattr);
3885         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3886         if (error == 0) {
3887                 /* block layout checks this! */
3888                 server->pnfs_blksize = fsinfo->blksize;
3889                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3890         }
3891
3892         return error;
3893 }
3894
3895 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3896                 struct nfs_pathconf *pathconf)
3897 {
3898         struct nfs4_pathconf_arg args = {
3899                 .fh = fhandle,
3900                 .bitmask = server->attr_bitmask,
3901         };
3902         struct nfs4_pathconf_res res = {
3903                 .pathconf = pathconf,
3904         };
3905         struct rpc_message msg = {
3906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3907                 .rpc_argp = &args,
3908                 .rpc_resp = &res,
3909         };
3910
3911         /* None of the pathconf attributes are mandatory to implement */
3912         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3913                 memset(pathconf, 0, sizeof(*pathconf));
3914                 return 0;
3915         }
3916
3917         nfs_fattr_init(pathconf->fattr);
3918         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3919 }
3920
3921 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3922                 struct nfs_pathconf *pathconf)
3923 {
3924         struct nfs4_exception exception = { };
3925         int err;
3926
3927         do {
3928                 err = nfs4_handle_exception(server,
3929                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3930                                 &exception);
3931         } while (exception.retry);
3932         return err;
3933 }
3934
3935 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3936                 const struct nfs_open_context *ctx,
3937                 const struct nfs_lock_context *l_ctx,
3938                 fmode_t fmode)
3939 {
3940         const struct nfs_lockowner *lockowner = NULL;
3941
3942         if (l_ctx != NULL)
3943                 lockowner = &l_ctx->lockowner;
3944         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3945 }
3946 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3947
3948 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3949                 const struct nfs_open_context *ctx,
3950                 const struct nfs_lock_context *l_ctx,
3951                 fmode_t fmode)
3952 {
3953         nfs4_stateid current_stateid;
3954
3955         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3956                 return false;
3957         return nfs4_stateid_match(stateid, &current_stateid);
3958 }
3959
3960 static bool nfs4_error_stateid_expired(int err)
3961 {
3962         switch (err) {
3963         case -NFS4ERR_DELEG_REVOKED:
3964         case -NFS4ERR_ADMIN_REVOKED:
3965         case -NFS4ERR_BAD_STATEID:
3966         case -NFS4ERR_STALE_STATEID:
3967         case -NFS4ERR_OLD_STATEID:
3968         case -NFS4ERR_OPENMODE:
3969         case -NFS4ERR_EXPIRED:
3970                 return true;
3971         }
3972         return false;
3973 }
3974
3975 void __nfs4_read_done_cb(struct nfs_read_data *data)
3976 {
3977         nfs_invalidate_atime(data->header->inode);
3978 }
3979
3980 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3981 {
3982         struct nfs_server *server = NFS_SERVER(data->header->inode);
3983
3984         trace_nfs4_read(data, task->tk_status);
3985         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3986                 rpc_restart_call_prepare(task);
3987                 return -EAGAIN;
3988         }
3989
3990         __nfs4_read_done_cb(data);
3991         if (task->tk_status > 0)
3992                 renew_lease(server, data->timestamp);
3993         return 0;
3994 }
3995
3996 static bool nfs4_read_stateid_changed(struct rpc_task *task,
3997                 struct nfs_readargs *args)
3998 {
3999
4000         if (!nfs4_error_stateid_expired(task->tk_status) ||
4001                 nfs4_stateid_is_current(&args->stateid,
4002                                 args->context,
4003                                 args->lock_context,
4004                                 FMODE_READ))
4005                 return false;
4006         rpc_restart_call_prepare(task);
4007         return true;
4008 }
4009
4010 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4011 {
4012
4013         dprintk("--> %s\n", __func__);
4014
4015         if (!nfs4_sequence_done(task, &data->res.seq_res))
4016                 return -EAGAIN;
4017         if (nfs4_read_stateid_changed(task, &data->args))
4018                 return -EAGAIN;
4019         return data->read_done_cb ? data->read_done_cb(task, data) :
4020                                     nfs4_read_done_cb(task, data);
4021 }
4022
4023 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4024 {
4025         data->timestamp   = jiffies;
4026         data->read_done_cb = nfs4_read_done_cb;
4027         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4028         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4029 }
4030
4031 static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4032 {
4033         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4034                         &data->args.seq_args,
4035                         &data->res.seq_res,
4036                         task))
4037                 return 0;
4038         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4039                                 data->args.lock_context, FMODE_READ) == -EIO)
4040                 return -EIO;
4041         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4042                 return -EIO;
4043         return 0;
4044 }
4045
4046 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4047 {
4048         struct inode *inode = data->header->inode;
4049
4050         trace_nfs4_write(data, task->tk_status);
4051         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4052                 rpc_restart_call_prepare(task);
4053                 return -EAGAIN;
4054         }
4055         if (task->tk_status >= 0) {
4056                 renew_lease(NFS_SERVER(inode), data->timestamp);
4057                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4058         }
4059         return 0;
4060 }
4061
4062 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4063                 struct nfs_writeargs *args)
4064 {
4065
4066         if (!nfs4_error_stateid_expired(task->tk_status) ||
4067                 nfs4_stateid_is_current(&args->stateid,
4068                                 args->context,
4069                                 args->lock_context,
4070                                 FMODE_WRITE))
4071                 return false;
4072         rpc_restart_call_prepare(task);
4073         return true;
4074 }
4075
4076 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4077 {
4078         if (!nfs4_sequence_done(task, &data->res.seq_res))
4079                 return -EAGAIN;
4080         if (nfs4_write_stateid_changed(task, &data->args))
4081                 return -EAGAIN;
4082         return data->write_done_cb ? data->write_done_cb(task, data) :
4083                 nfs4_write_done_cb(task, data);
4084 }
4085
4086 static
4087 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4088 {
4089         const struct nfs_pgio_header *hdr = data->header;
4090
4091         /* Don't request attributes for pNFS or O_DIRECT writes */
4092         if (data->ds_clp != NULL || hdr->dreq != NULL)
4093                 return false;
4094         /* Otherwise, request attributes if and only if we don't hold
4095          * a delegation
4096          */
4097         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4098 }
4099
4100 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4101 {
4102         struct nfs_server *server = NFS_SERVER(data->header->inode);
4103
4104         if (!nfs4_write_need_cache_consistency_data(data)) {
4105                 data->args.bitmask = NULL;
4106                 data->res.fattr = NULL;
4107         } else
4108                 data->args.bitmask = server->cache_consistency_bitmask;
4109
4110         if (!data->write_done_cb)
4111                 data->write_done_cb = nfs4_write_done_cb;
4112         data->res.server = server;
4113         data->timestamp   = jiffies;
4114
4115         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4116         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4117 }
4118
4119 static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4120 {
4121         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4122                         &data->args.seq_args,
4123                         &data->res.seq_res,
4124                         task))
4125                 return 0;
4126         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4127                                 data->args.lock_context, FMODE_WRITE) == -EIO)
4128                 return -EIO;
4129         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4130                 return -EIO;
4131         return 0;
4132 }
4133
4134 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4135 {
4136         nfs4_setup_sequence(NFS_SERVER(data->inode),
4137                         &data->args.seq_args,
4138                         &data->res.seq_res,
4139                         task);
4140 }
4141
4142 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4143 {
4144         struct inode *inode = data->inode;
4145
4146         trace_nfs4_commit(data, task->tk_status);
4147         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4148                 rpc_restart_call_prepare(task);
4149                 return -EAGAIN;
4150         }
4151         return 0;
4152 }
4153
4154 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4155 {
4156         if (!nfs4_sequence_done(task, &data->res.seq_res))
4157                 return -EAGAIN;
4158         return data->commit_done_cb(task, data);
4159 }
4160
4161 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4162 {
4163         struct nfs_server *server = NFS_SERVER(data->inode);
4164
4165         if (data->commit_done_cb == NULL)
4166                 data->commit_done_cb = nfs4_commit_done_cb;
4167         data->res.server = server;
4168         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4169         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4170 }
4171
4172 struct nfs4_renewdata {
4173         struct nfs_client       *client;
4174         unsigned long           timestamp;
4175 };
4176
4177 /*
4178  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4179  * standalone procedure for queueing an asynchronous RENEW.
4180  */
4181 static void nfs4_renew_release(void *calldata)
4182 {
4183         struct nfs4_renewdata *data = calldata;
4184         struct nfs_client *clp = data->client;
4185
4186         if (atomic_read(&clp->cl_count) > 1)
4187                 nfs4_schedule_state_renewal(clp);
4188         nfs_put_client(clp);
4189         kfree(data);
4190 }
4191
4192 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4193 {
4194         struct nfs4_renewdata *data = calldata;
4195         struct nfs_client *clp = data->client;
4196         unsigned long timestamp = data->timestamp;
4197
4198         trace_nfs4_renew_async(clp, task->tk_status);
4199         if (task->tk_status < 0) {
4200                 /* Unless we're shutting down, schedule state recovery! */
4201                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4202                         return;
4203                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4204                         nfs4_schedule_lease_recovery(clp);
4205                         return;
4206                 }
4207                 nfs4_schedule_path_down_recovery(clp);
4208         }
4209         do_renew_lease(clp, timestamp);
4210 }
4211
4212 static const struct rpc_call_ops nfs4_renew_ops = {
4213         .rpc_call_done = nfs4_renew_done,
4214         .rpc_release = nfs4_renew_release,
4215 };
4216
4217 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4218 {
4219         struct rpc_message msg = {
4220                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4221                 .rpc_argp       = clp,
4222                 .rpc_cred       = cred,
4223         };
4224         struct nfs4_renewdata *data;
4225
4226         if (renew_flags == 0)
4227                 return 0;
4228         if (!atomic_inc_not_zero(&clp->cl_count))
4229                 return -EIO;
4230         data = kmalloc(sizeof(*data), GFP_NOFS);
4231         if (data == NULL)
4232                 return -ENOMEM;
4233         data->client = clp;
4234         data->timestamp = jiffies;
4235         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4236                         &nfs4_renew_ops, data);
4237 }
4238
4239 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4240 {
4241         struct rpc_message msg = {
4242                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4243                 .rpc_argp       = clp,
4244                 .rpc_cred       = cred,
4245         };
4246         unsigned long now = jiffies;
4247         int status;
4248
4249         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4250         if (status < 0)
4251                 return status;
4252         do_renew_lease(clp, now);
4253         return 0;
4254 }
4255
4256 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4257 {
4258         return (server->caps & NFS_CAP_ACLS)
4259                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4260                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4261 }
4262
4263 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4264  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4265  * the stack.
4266  */
4267 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4268
4269 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4270                 struct page **pages, unsigned int *pgbase)
4271 {
4272         struct page *newpage, **spages;
4273         int rc = 0;
4274         size_t len;
4275         spages = pages;
4276
4277         do {
4278                 len = min_t(size_t, PAGE_SIZE, buflen);
4279                 newpage = alloc_page(GFP_KERNEL);
4280
4281                 if (newpage == NULL)
4282                         goto unwind;
4283                 memcpy(page_address(newpage), buf, len);
4284                 buf += len;
4285                 buflen -= len;
4286                 *pages++ = newpage;
4287                 rc++;
4288         } while (buflen != 0);
4289
4290         return rc;
4291
4292 unwind:
4293         for(; rc > 0; rc--)
4294                 __free_page(spages[rc-1]);
4295         return -ENOMEM;
4296 }
4297
4298 struct nfs4_cached_acl {
4299         int cached;
4300         size_t len;
4301         char data[0];
4302 };
4303
4304 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4305 {
4306         struct nfs_inode *nfsi = NFS_I(inode);
4307
4308         spin_lock(&inode->i_lock);
4309         kfree(nfsi->nfs4_acl);
4310         nfsi->nfs4_acl = acl;
4311         spin_unlock(&inode->i_lock);
4312 }
4313
4314 static void nfs4_zap_acl_attr(struct inode *inode)
4315 {
4316         nfs4_set_cached_acl(inode, NULL);
4317 }
4318
4319 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4320 {
4321         struct nfs_inode *nfsi = NFS_I(inode);
4322         struct nfs4_cached_acl *acl;
4323         int ret = -ENOENT;
4324
4325         spin_lock(&inode->i_lock);
4326         acl = nfsi->nfs4_acl;
4327         if (acl == NULL)
4328                 goto out;
4329         if (buf == NULL) /* user is just asking for length */
4330                 goto out_len;
4331         if (acl->cached == 0)
4332                 goto out;
4333         ret = -ERANGE; /* see getxattr(2) man page */
4334         if (acl->len > buflen)
4335                 goto out;
4336         memcpy(buf, acl->data, acl->len);
4337 out_len:
4338         ret = acl->len;
4339 out:
4340         spin_unlock(&inode->i_lock);
4341         return ret;
4342 }
4343
4344 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4345 {
4346         struct nfs4_cached_acl *acl;
4347         size_t buflen = sizeof(*acl) + acl_len;
4348
4349         if (buflen <= PAGE_SIZE) {
4350                 acl = kmalloc(buflen, GFP_KERNEL);
4351                 if (acl == NULL)
4352                         goto out;
4353                 acl->cached = 1;
4354                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4355         } else {
4356                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4357                 if (acl == NULL)
4358                         goto out;
4359                 acl->cached = 0;
4360         }
4361         acl->len = acl_len;
4362 out:
4363         nfs4_set_cached_acl(inode, acl);
4364 }
4365
4366 /*
4367  * The getxattr API returns the required buffer length when called with a
4368  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4369  * the required buf.  On a NULL buf, we send a page of data to the server
4370  * guessing that the ACL request can be serviced by a page. If so, we cache
4371  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4372  * the cache. If not so, we throw away the page, and cache the required
4373  * length. The next getxattr call will then produce another round trip to
4374  * the server, this time with the input buf of the required size.
4375  */
4376 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4377 {
4378         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4379         struct nfs_getaclargs args = {
4380                 .fh = NFS_FH(inode),
4381                 .acl_pages = pages,
4382                 .acl_len = buflen,
4383         };
4384         struct nfs_getaclres res = {
4385                 .acl_len = buflen,
4386         };
4387         struct rpc_message msg = {
4388                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4389                 .rpc_argp = &args,
4390                 .rpc_resp = &res,
4391         };
4392         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4393         int ret = -ENOMEM, i;
4394
4395         /* As long as we're doing a round trip to the server anyway,
4396          * let's be prepared for a page of acl data. */
4397         if (npages == 0)
4398                 npages = 1;
4399         if (npages > ARRAY_SIZE(pages))
4400                 return -ERANGE;
4401
4402         for (i = 0; i < npages; i++) {
4403                 pages[i] = alloc_page(GFP_KERNEL);
4404                 if (!pages[i])
4405                         goto out_free;
4406         }
4407
4408         /* for decoding across pages */
4409         res.acl_scratch = alloc_page(GFP_KERNEL);
4410         if (!res.acl_scratch)
4411                 goto out_free;
4412
4413         args.acl_len = npages * PAGE_SIZE;
4414         args.acl_pgbase = 0;
4415
4416         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4417                 __func__, buf, buflen, npages, args.acl_len);
4418         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4419                              &msg, &args.seq_args, &res.seq_res, 0);
4420         if (ret)
4421                 goto out_free;
4422
4423         /* Handle the case where the passed-in buffer is too short */
4424         if (res.acl_flags & NFS4_ACL_TRUNC) {
4425                 /* Did the user only issue a request for the acl length? */
4426                 if (buf == NULL)
4427                         goto out_ok;
4428                 ret = -ERANGE;
4429                 goto out_free;
4430         }
4431         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4432         if (buf) {
4433                 if (res.acl_len > buflen) {
4434                         ret = -ERANGE;
4435                         goto out_free;
4436                 }
4437                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4438         }
4439 out_ok:
4440         ret = res.acl_len;
4441 out_free:
4442         for (i = 0; i < npages; i++)
4443                 if (pages[i])
4444                         __free_page(pages[i]);
4445         if (res.acl_scratch)
4446                 __free_page(res.acl_scratch);
4447         return ret;
4448 }
4449
4450 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4451 {
4452         struct nfs4_exception exception = { };
4453         ssize_t ret;
4454         do {
4455                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4456                 trace_nfs4_get_acl(inode, ret);
4457                 if (ret >= 0)
4458                         break;
4459                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4460         } while (exception.retry);
4461         return ret;
4462 }
4463
4464 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4465 {
4466         struct nfs_server *server = NFS_SERVER(inode);
4467         int ret;
4468
4469         if (!nfs4_server_supports_acls(server))
4470                 return -EOPNOTSUPP;
4471         ret = nfs_revalidate_inode(server, inode);
4472         if (ret < 0)
4473                 return ret;
4474         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4475                 nfs_zap_acl_cache(inode);
4476         ret = nfs4_read_cached_acl(inode, buf, buflen);
4477         if (ret != -ENOENT)
4478                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4479                  * but no cached acl data, just the acl length */
4480                 return ret;
4481         return nfs4_get_acl_uncached(inode, buf, buflen);
4482 }
4483
4484 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4485 {
4486         struct nfs_server *server = NFS_SERVER(inode);
4487         struct page *pages[NFS4ACL_MAXPAGES];
4488         struct nfs_setaclargs arg = {
4489                 .fh             = NFS_FH(inode),
4490                 .acl_pages      = pages,
4491                 .acl_len        = buflen,
4492         };
4493         struct nfs_setaclres res;
4494         struct rpc_message msg = {
4495                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4496                 .rpc_argp       = &arg,
4497                 .rpc_resp       = &res,
4498         };
4499         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4500         int ret, i;
4501
4502         if (!nfs4_server_supports_acls(server))
4503                 return -EOPNOTSUPP;
4504         if (npages > ARRAY_SIZE(pages))
4505                 return -ERANGE;
4506         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4507         if (i < 0)
4508                 return i;
4509         nfs4_inode_return_delegation(inode);
4510         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4511
4512         /*
4513          * Free each page after tx, so the only ref left is
4514          * held by the network stack
4515          */
4516         for (; i > 0; i--)
4517                 put_page(pages[i-1]);
4518
4519         /*
4520          * Acl update can result in inode attribute update.
4521          * so mark the attribute cache invalid.
4522          */
4523         spin_lock(&inode->i_lock);
4524         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4525         spin_unlock(&inode->i_lock);
4526         nfs_access_zap_cache(inode);
4527         nfs_zap_acl_cache(inode);
4528         return ret;
4529 }
4530
4531 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4532 {
4533         struct nfs4_exception exception = { };
4534         int err;
4535         do {
4536                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4537                 trace_nfs4_set_acl(inode, err);
4538                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4539                                 &exception);
4540         } while (exception.retry);
4541         return err;
4542 }
4543
4544 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4545 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4546                                         size_t buflen)
4547 {
4548         struct nfs_server *server = NFS_SERVER(inode);
4549         struct nfs_fattr fattr;
4550         struct nfs4_label label = {0, 0, buflen, buf};
4551
4552         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4553         struct nfs4_getattr_arg args = {
4554                 .fh             = NFS_FH(inode),
4555                 .bitmask        = bitmask,
4556         };
4557         struct nfs4_getattr_res res = {
4558                 .fattr          = &fattr,
4559                 .label          = &label,
4560                 .server         = server,
4561         };
4562         struct rpc_message msg = {
4563                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4564                 .rpc_argp       = &args,
4565                 .rpc_resp       = &res,
4566         };
4567         int ret;
4568
4569         nfs_fattr_init(&fattr);
4570
4571         ret = rpc_call_sync(server->client, &msg, 0);
4572         if (ret)
4573                 return ret;
4574         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4575                 return -ENOENT;
4576         if (buflen < label.len)
4577                 return -ERANGE;
4578         return 0;
4579 }
4580
4581 static int nfs4_get_security_label(struct inode *inode, void *buf,
4582                                         size_t buflen)
4583 {
4584         struct nfs4_exception exception = { };
4585         int err;
4586
4587         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4588                 return -EOPNOTSUPP;
4589
4590         do {
4591                 err = _nfs4_get_security_label(inode, buf, buflen);
4592                 trace_nfs4_get_security_label(inode, err);
4593                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4594                                 &exception);
4595         } while (exception.retry);
4596         return err;
4597 }
4598
4599 static int _nfs4_do_set_security_label(struct inode *inode,
4600                 struct nfs4_label *ilabel,
4601                 struct nfs_fattr *fattr,
4602                 struct nfs4_label *olabel)
4603 {
4604
4605         struct iattr sattr = {0};
4606         struct nfs_server *server = NFS_SERVER(inode);
4607         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4608         struct nfs_setattrargs args = {
4609                 .fh             = NFS_FH(inode),
4610                 .iap            = &sattr,
4611                 .server         = server,
4612                 .bitmask        = bitmask,
4613                 .label          = ilabel,
4614         };
4615         struct nfs_setattrres res = {
4616                 .fattr          = fattr,
4617                 .label          = olabel,
4618                 .server         = server,
4619         };
4620         struct rpc_message msg = {
4621                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4622                 .rpc_argp       = &args,
4623                 .rpc_resp       = &res,
4624         };
4625         int status;
4626
4627         nfs4_stateid_copy(&args.stateid, &zero_stateid);
4628
4629         status = rpc_call_sync(server->client, &msg, 0);
4630         if (status)
4631                 dprintk("%s failed: %d\n", __func__, status);
4632
4633         return status;
4634 }
4635
4636 static int nfs4_do_set_security_label(struct inode *inode,
4637                 struct nfs4_label *ilabel,
4638                 struct nfs_fattr *fattr,
4639                 struct nfs4_label *olabel)
4640 {
4641         struct nfs4_exception exception = { };
4642         int err;
4643
4644         do {
4645                 err = _nfs4_do_set_security_label(inode, ilabel,
4646                                 fattr, olabel);
4647                 trace_nfs4_set_security_label(inode, err);
4648                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4649                                 &exception);
4650         } while (exception.retry);
4651         return err;
4652 }
4653
4654 static int
4655 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4656 {
4657         struct nfs4_label ilabel, *olabel = NULL;
4658         struct nfs_fattr fattr;
4659         struct rpc_cred *cred;
4660         struct inode *inode = dentry->d_inode;
4661         int status;
4662
4663         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4664                 return -EOPNOTSUPP;
4665
4666         nfs_fattr_init(&fattr);
4667
4668         ilabel.pi = 0;
4669         ilabel.lfs = 0;
4670         ilabel.label = (char *)buf;
4671         ilabel.len = buflen;
4672
4673         cred = rpc_lookup_cred();
4674         if (IS_ERR(cred))
4675                 return PTR_ERR(cred);
4676
4677         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4678         if (IS_ERR(olabel)) {
4679                 status = -PTR_ERR(olabel);
4680                 goto out;
4681         }
4682
4683         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4684         if (status == 0)
4685                 nfs_setsecurity(inode, &fattr, olabel);
4686
4687         nfs4_label_free(olabel);
4688 out:
4689         put_rpccred(cred);
4690         return status;
4691 }
4692 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4693
4694
4695 static int
4696 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4697 {
4698         struct nfs_client *clp = server->nfs_client;
4699
4700         if (task->tk_status >= 0)
4701                 return 0;
4702         switch(task->tk_status) {
4703                 case -NFS4ERR_DELEG_REVOKED:
4704                 case -NFS4ERR_ADMIN_REVOKED:
4705                 case -NFS4ERR_BAD_STATEID:
4706                         if (state == NULL)
4707                                 break;
4708                         nfs_remove_bad_delegation(state->inode);
4709                 case -NFS4ERR_OPENMODE:
4710                         if (state == NULL)
4711                                 break;
4712                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4713                                 goto stateid_invalid;
4714                         goto wait_on_recovery;
4715                 case -NFS4ERR_EXPIRED:
4716                         if (state != NULL) {
4717                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4718                                         goto stateid_invalid;
4719                         }
4720                 case -NFS4ERR_STALE_STATEID:
4721                 case -NFS4ERR_STALE_CLIENTID:
4722                         nfs4_schedule_lease_recovery(clp);
4723                         goto wait_on_recovery;
4724 #if defined(CONFIG_NFS_V4_1)
4725                 case -NFS4ERR_BADSESSION:
4726                 case -NFS4ERR_BADSLOT:
4727                 case -NFS4ERR_BAD_HIGH_SLOT:
4728                 case -NFS4ERR_DEADSESSION:
4729                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4730                 case -NFS4ERR_SEQ_FALSE_RETRY:
4731                 case -NFS4ERR_SEQ_MISORDERED:
4732                         dprintk("%s ERROR %d, Reset session\n", __func__,
4733                                 task->tk_status);
4734                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4735                         task->tk_status = 0;
4736                         return -EAGAIN;
4737 #endif /* CONFIG_NFS_V4_1 */
4738                 case -NFS4ERR_DELAY:
4739                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4740                 case -NFS4ERR_GRACE:
4741                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4742                         task->tk_status = 0;
4743                         return -EAGAIN;
4744                 case -NFS4ERR_RETRY_UNCACHED_REP:
4745                 case -NFS4ERR_OLD_STATEID:
4746                         task->tk_status = 0;
4747                         return -EAGAIN;
4748         }
4749         task->tk_status = nfs4_map_errors(task->tk_status);
4750         return 0;
4751 stateid_invalid:
4752         task->tk_status = -EIO;
4753         return 0;
4754 wait_on_recovery:
4755         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4756         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4757                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4758         task->tk_status = 0;
4759         return -EAGAIN;
4760 }
4761
4762 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4763                                     nfs4_verifier *bootverf)
4764 {
4765         __be32 verf[2];
4766
4767         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4768                 /* An impossible timestamp guarantees this value
4769                  * will never match a generated boot time. */
4770                 verf[0] = 0;
4771                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4772         } else {
4773                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4774                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4775                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4776         }
4777         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4778 }
4779
4780 static unsigned int
4781 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4782                                    char *buf, size_t len)
4783 {
4784         unsigned int result;
4785
4786         rcu_read_lock();
4787         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4788                                 clp->cl_ipaddr,
4789                                 rpc_peeraddr2str(clp->cl_rpcclient,
4790                                                         RPC_DISPLAY_ADDR),
4791                                 rpc_peeraddr2str(clp->cl_rpcclient,
4792                                                         RPC_DISPLAY_PROTO));
4793         rcu_read_unlock();
4794         return result;
4795 }
4796
4797 static unsigned int
4798 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4799                                 char *buf, size_t len)
4800 {
4801         const char *nodename = clp->cl_rpcclient->cl_nodename;
4802
4803         if (nfs4_client_id_uniquifier[0] != '\0')
4804                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4805                                 clp->rpc_ops->version,
4806                                 clp->cl_minorversion,
4807                                 nfs4_client_id_uniquifier,
4808                                 nodename);
4809         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4810                                 clp->rpc_ops->version, clp->cl_minorversion,
4811                                 nodename);
4812 }
4813
4814 /**
4815  * nfs4_proc_setclientid - Negotiate client ID
4816  * @clp: state data structure
4817  * @program: RPC program for NFSv4 callback service
4818  * @port: IP port number for NFS4 callback service
4819  * @cred: RPC credential to use for this call
4820  * @res: where to place the result
4821  *
4822  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4823  */
4824 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4825                 unsigned short port, struct rpc_cred *cred,
4826                 struct nfs4_setclientid_res *res)
4827 {
4828         nfs4_verifier sc_verifier;
4829         struct nfs4_setclientid setclientid = {
4830                 .sc_verifier = &sc_verifier,
4831                 .sc_prog = program,
4832                 .sc_cb_ident = clp->cl_cb_ident,
4833         };
4834         struct rpc_message msg = {
4835                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4836                 .rpc_argp = &setclientid,
4837                 .rpc_resp = res,
4838                 .rpc_cred = cred,
4839         };
4840         int status;
4841
4842         /* nfs_client_id4 */
4843         nfs4_init_boot_verifier(clp, &sc_verifier);
4844         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4845                 setclientid.sc_name_len =
4846                                 nfs4_init_uniform_client_string(clp,
4847                                                 setclientid.sc_name,
4848                                                 sizeof(setclientid.sc_name));
4849         else
4850                 setclientid.sc_name_len =
4851                                 nfs4_init_nonuniform_client_string(clp,
4852                                                 setclientid.sc_name,
4853                                                 sizeof(setclientid.sc_name));
4854         /* cb_client4 */
4855         rcu_read_lock();
4856         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4857                                 sizeof(setclientid.sc_netid), "%s",
4858                                 rpc_peeraddr2str(clp->cl_rpcclient,
4859                                                         RPC_DISPLAY_NETID));
4860         rcu_read_unlock();
4861         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4862                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4863                                 clp->cl_ipaddr, port >> 8, port & 255);
4864
4865         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4866                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4867                 setclientid.sc_name_len, setclientid.sc_name);
4868         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4869         trace_nfs4_setclientid(clp, status);
4870         dprintk("NFS reply setclientid: %d\n", status);
4871         return status;
4872 }
4873
4874 /**
4875  * nfs4_proc_setclientid_confirm - Confirm client ID
4876  * @clp: state data structure
4877  * @res: result of a previous SETCLIENTID
4878  * @cred: RPC credential to use for this call
4879  *
4880  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4881  */
4882 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4883                 struct nfs4_setclientid_res *arg,
4884                 struct rpc_cred *cred)
4885 {
4886         struct rpc_message msg = {
4887                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4888                 .rpc_argp = arg,
4889                 .rpc_cred = cred,
4890         };
4891         int status;
4892
4893         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4894                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4895                 clp->cl_clientid);
4896         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4897         trace_nfs4_setclientid_confirm(clp, status);
4898         dprintk("NFS reply setclientid_confirm: %d\n", status);
4899         return status;
4900 }
4901
4902 struct nfs4_delegreturndata {
4903         struct nfs4_delegreturnargs args;
4904         struct nfs4_delegreturnres res;
4905         struct nfs_fh fh;
4906         nfs4_stateid stateid;
4907         unsigned long timestamp;
4908         struct nfs_fattr fattr;
4909         int rpc_status;
4910 };
4911
4912 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4913 {
4914         struct nfs4_delegreturndata *data = calldata;
4915
4916         if (!nfs4_sequence_done(task, &data->res.seq_res))
4917                 return;
4918
4919         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4920         switch (task->tk_status) {
4921         case -NFS4ERR_STALE_STATEID:
4922         case -NFS4ERR_EXPIRED:
4923         case 0:
4924                 renew_lease(data->res.server, data->timestamp);
4925                 break;
4926         default:
4927                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4928                                 -EAGAIN) {
4929                         rpc_restart_call_prepare(task);
4930                         return;
4931                 }
4932         }
4933         data->rpc_status = task->tk_status;
4934 }
4935
4936 static void nfs4_delegreturn_release(void *calldata)
4937 {
4938         kfree(calldata);
4939 }
4940
4941 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4942 {
4943         struct nfs4_delegreturndata *d_data;
4944
4945         d_data = (struct nfs4_delegreturndata *)data;
4946
4947         nfs4_setup_sequence(d_data->res.server,
4948                         &d_data->args.seq_args,
4949                         &d_data->res.seq_res,
4950                         task);
4951 }
4952
4953 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4954         .rpc_call_prepare = nfs4_delegreturn_prepare,
4955         .rpc_call_done = nfs4_delegreturn_done,
4956         .rpc_release = nfs4_delegreturn_release,
4957 };
4958
4959 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4960 {
4961         struct nfs4_delegreturndata *data;
4962         struct nfs_server *server = NFS_SERVER(inode);
4963         struct rpc_task *task;
4964         struct rpc_message msg = {
4965                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4966                 .rpc_cred = cred,
4967         };
4968         struct rpc_task_setup task_setup_data = {
4969                 .rpc_client = server->client,
4970                 .rpc_message = &msg,
4971                 .callback_ops = &nfs4_delegreturn_ops,
4972                 .flags = RPC_TASK_ASYNC,
4973         };
4974         int status = 0;
4975
4976         data = kzalloc(sizeof(*data), GFP_NOFS);
4977         if (data == NULL)
4978                 return -ENOMEM;
4979         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4980         data->args.fhandle = &data->fh;
4981         data->args.stateid = &data->stateid;
4982         data->args.bitmask = server->cache_consistency_bitmask;
4983         nfs_copy_fh(&data->fh, NFS_FH(inode));
4984         nfs4_stateid_copy(&data->stateid, stateid);
4985         data->res.fattr = &data->fattr;
4986         data->res.server = server;
4987         nfs_fattr_init(data->res.fattr);
4988         data->timestamp = jiffies;
4989         data->rpc_status = 0;
4990
4991         task_setup_data.callback_data = data;
4992         msg.rpc_argp = &data->args;
4993         msg.rpc_resp = &data->res;
4994         task = rpc_run_task(&task_setup_data);
4995         if (IS_ERR(task))
4996                 return PTR_ERR(task);
4997         if (!issync)
4998                 goto out;
4999         status = nfs4_wait_for_completion_rpc_task(task);
5000         if (status != 0)
5001                 goto out;
5002         status = data->rpc_status;
5003         if (status == 0)
5004                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5005         else
5006                 nfs_refresh_inode(inode, &data->fattr);
5007 out:
5008         rpc_put_task(task);
5009         return status;
5010 }
5011
5012 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5013 {
5014         struct nfs_server *server = NFS_SERVER(inode);
5015         struct nfs4_exception exception = { };
5016         int err;
5017         do {
5018                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5019                 trace_nfs4_delegreturn(inode, err);
5020                 switch (err) {
5021                         case -NFS4ERR_STALE_STATEID:
5022                         case -NFS4ERR_EXPIRED:
5023                         case 0:
5024                                 return 0;
5025                 }
5026                 err = nfs4_handle_exception(server, err, &exception);
5027         } while (exception.retry);
5028         return err;
5029 }
5030
5031 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5032 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5033
5034 /*
5035  * sleep, with exponential backoff, and retry the LOCK operation.
5036  */
5037 static unsigned long
5038 nfs4_set_lock_task_retry(unsigned long timeout)
5039 {
5040         freezable_schedule_timeout_killable_unsafe(timeout);
5041         timeout <<= 1;
5042         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5043                 return NFS4_LOCK_MAXTIMEOUT;
5044         return timeout;
5045 }
5046
5047 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5048 {
5049         struct inode *inode = state->inode;
5050         struct nfs_server *server = NFS_SERVER(inode);
5051         struct nfs_client *clp = server->nfs_client;
5052         struct nfs_lockt_args arg = {
5053                 .fh = NFS_FH(inode),
5054                 .fl = request,
5055         };
5056         struct nfs_lockt_res res = {
5057                 .denied = request,
5058         };
5059         struct rpc_message msg = {
5060                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5061                 .rpc_argp       = &arg,
5062                 .rpc_resp       = &res,
5063                 .rpc_cred       = state->owner->so_cred,
5064         };
5065         struct nfs4_lock_state *lsp;
5066         int status;
5067
5068         arg.lock_owner.clientid = clp->cl_clientid;
5069         status = nfs4_set_lock_state(state, request);
5070         if (status != 0)
5071                 goto out;
5072         lsp = request->fl_u.nfs4_fl.owner;
5073         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5074         arg.lock_owner.s_dev = server->s_dev;
5075         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5076         switch (status) {
5077                 case 0:
5078                         request->fl_type = F_UNLCK;
5079                         break;
5080                 case -NFS4ERR_DENIED:
5081                         status = 0;
5082         }
5083         request->fl_ops->fl_release_private(request);
5084 out:
5085         return status;
5086 }
5087
5088 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5089 {
5090         struct nfs4_exception exception = { };
5091         int err;
5092
5093         do {
5094                 err = _nfs4_proc_getlk(state, cmd, request);
5095                 trace_nfs4_get_lock(request, state, cmd, err);
5096                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5097                                 &exception);
5098         } while (exception.retry);
5099         return err;
5100 }
5101
5102 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5103 {
5104         int res = 0;
5105         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5106                 case FL_POSIX:
5107                         res = posix_lock_file_wait(file, fl);
5108                         break;
5109                 case FL_FLOCK:
5110                         res = flock_lock_file_wait(file, fl);
5111                         break;
5112                 default:
5113                         BUG();
5114         }
5115         return res;
5116 }
5117
5118 struct nfs4_unlockdata {
5119         struct nfs_locku_args arg;
5120         struct nfs_locku_res res;
5121         struct nfs4_lock_state *lsp;
5122         struct nfs_open_context *ctx;
5123         struct file_lock fl;
5124         const struct nfs_server *server;
5125         unsigned long timestamp;
5126 };
5127
5128 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5129                 struct nfs_open_context *ctx,
5130                 struct nfs4_lock_state *lsp,
5131                 struct nfs_seqid *seqid)
5132 {
5133         struct nfs4_unlockdata *p;
5134         struct inode *inode = lsp->ls_state->inode;
5135
5136         p = kzalloc(sizeof(*p), GFP_NOFS);
5137         if (p == NULL)
5138                 return NULL;
5139         p->arg.fh = NFS_FH(inode);
5140         p->arg.fl = &p->fl;
5141         p->arg.seqid = seqid;
5142         p->res.seqid = seqid;
5143         p->arg.stateid = &lsp->ls_stateid;
5144         p->lsp = lsp;
5145         atomic_inc(&lsp->ls_count);
5146         /* Ensure we don't close file until we're done freeing locks! */
5147         p->ctx = get_nfs_open_context(ctx);
5148         memcpy(&p->fl, fl, sizeof(p->fl));
5149         p->server = NFS_SERVER(inode);
5150         return p;
5151 }
5152
5153 static void nfs4_locku_release_calldata(void *data)
5154 {
5155         struct nfs4_unlockdata *calldata = data;
5156         nfs_free_seqid(calldata->arg.seqid);
5157         nfs4_put_lock_state(calldata->lsp);
5158         put_nfs_open_context(calldata->ctx);
5159         kfree(calldata);
5160 }
5161
5162 static void nfs4_locku_done(struct rpc_task *task, void *data)
5163 {
5164         struct nfs4_unlockdata *calldata = data;
5165
5166         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5167                 return;
5168         switch (task->tk_status) {
5169                 case 0:
5170                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5171                                         &calldata->res.stateid);
5172                         renew_lease(calldata->server, calldata->timestamp);
5173                         break;
5174                 case -NFS4ERR_BAD_STATEID:
5175                 case -NFS4ERR_OLD_STATEID:
5176                 case -NFS4ERR_STALE_STATEID:
5177                 case -NFS4ERR_EXPIRED:
5178                         break;
5179                 default:
5180                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5181                                 rpc_restart_call_prepare(task);
5182         }
5183         nfs_release_seqid(calldata->arg.seqid);
5184 }
5185
5186 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5187 {
5188         struct nfs4_unlockdata *calldata = data;
5189
5190         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5191                 goto out_wait;
5192         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5193                 /* Note: exit _without_ running nfs4_locku_done */
5194                 goto out_no_action;
5195         }
5196         calldata->timestamp = jiffies;
5197         if (nfs4_setup_sequence(calldata->server,
5198                                 &calldata->arg.seq_args,
5199                                 &calldata->res.seq_res,
5200                                 task) != 0)
5201                 nfs_release_seqid(calldata->arg.seqid);
5202         return;
5203 out_no_action:
5204         task->tk_action = NULL;
5205 out_wait:
5206         nfs4_sequence_done(task, &calldata->res.seq_res);
5207 }
5208
5209 static const struct rpc_call_ops nfs4_locku_ops = {
5210         .rpc_call_prepare = nfs4_locku_prepare,
5211         .rpc_call_done = nfs4_locku_done,
5212         .rpc_release = nfs4_locku_release_calldata,
5213 };
5214
5215 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5216                 struct nfs_open_context *ctx,
5217                 struct nfs4_lock_state *lsp,
5218                 struct nfs_seqid *seqid)
5219 {
5220         struct nfs4_unlockdata *data;
5221         struct rpc_message msg = {
5222                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5223                 .rpc_cred = ctx->cred,
5224         };
5225         struct rpc_task_setup task_setup_data = {
5226                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5227                 .rpc_message = &msg,
5228                 .callback_ops = &nfs4_locku_ops,
5229                 .workqueue = nfsiod_workqueue,
5230                 .flags = RPC_TASK_ASYNC,
5231         };
5232
5233         /* Ensure this is an unlock - when canceling a lock, the
5234          * canceled lock is passed in, and it won't be an unlock.
5235          */
5236         fl->fl_type = F_UNLCK;
5237
5238         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5239         if (data == NULL) {
5240                 nfs_free_seqid(seqid);
5241                 return ERR_PTR(-ENOMEM);
5242         }
5243
5244         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5245         msg.rpc_argp = &data->arg;
5246         msg.rpc_resp = &data->res;
5247         task_setup_data.callback_data = data;
5248         return rpc_run_task(&task_setup_data);
5249 }
5250
5251 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5252 {
5253         struct inode *inode = state->inode;
5254         struct nfs4_state_owner *sp = state->owner;
5255         struct nfs_inode *nfsi = NFS_I(inode);
5256         struct nfs_seqid *seqid;
5257         struct nfs4_lock_state *lsp;
5258         struct rpc_task *task;
5259         int status = 0;
5260         unsigned char fl_flags = request->fl_flags;
5261
5262         status = nfs4_set_lock_state(state, request);
5263         /* Unlock _before_ we do the RPC call */
5264         request->fl_flags |= FL_EXISTS;
5265         /* Exclude nfs_delegation_claim_locks() */
5266         mutex_lock(&sp->so_delegreturn_mutex);
5267         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5268         down_read(&nfsi->rwsem);
5269         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5270                 up_read(&nfsi->rwsem);
5271                 mutex_unlock(&sp->so_delegreturn_mutex);
5272                 goto out;
5273         }
5274         up_read(&nfsi->rwsem);
5275         mutex_unlock(&sp->so_delegreturn_mutex);
5276         if (status != 0)
5277                 goto out;
5278         /* Is this a delegated lock? */
5279         lsp = request->fl_u.nfs4_fl.owner;
5280         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5281                 goto out;
5282         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5283         status = -ENOMEM;
5284         if (seqid == NULL)
5285                 goto out;
5286         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5287         status = PTR_ERR(task);
5288         if (IS_ERR(task))
5289                 goto out;
5290         status = nfs4_wait_for_completion_rpc_task(task);
5291         rpc_put_task(task);
5292 out:
5293         request->fl_flags = fl_flags;
5294         trace_nfs4_unlock(request, state, F_SETLK, status);
5295         return status;
5296 }
5297
5298 struct nfs4_lockdata {
5299         struct nfs_lock_args arg;
5300         struct nfs_lock_res res;
5301         struct nfs4_lock_state *lsp;
5302         struct nfs_open_context *ctx;
5303         struct file_lock fl;
5304         unsigned long timestamp;
5305         int rpc_status;
5306         int cancelled;
5307         struct nfs_server *server;
5308 };
5309
5310 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5311                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5312                 gfp_t gfp_mask)
5313 {
5314         struct nfs4_lockdata *p;
5315         struct inode *inode = lsp->ls_state->inode;
5316         struct nfs_server *server = NFS_SERVER(inode);
5317
5318         p = kzalloc(sizeof(*p), gfp_mask);
5319         if (p == NULL)
5320                 return NULL;
5321
5322         p->arg.fh = NFS_FH(inode);
5323         p->arg.fl = &p->fl;
5324         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5325         if (p->arg.open_seqid == NULL)
5326                 goto out_free;
5327         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5328         if (p->arg.lock_seqid == NULL)
5329                 goto out_free_seqid;
5330         p->arg.lock_stateid = &lsp->ls_stateid;
5331         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5332         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5333         p->arg.lock_owner.s_dev = server->s_dev;
5334         p->res.lock_seqid = p->arg.lock_seqid;
5335         p->lsp = lsp;
5336         p->server = server;
5337         atomic_inc(&lsp->ls_count);
5338         p->ctx = get_nfs_open_context(ctx);
5339         memcpy(&p->fl, fl, sizeof(p->fl));
5340         return p;
5341 out_free_seqid:
5342         nfs_free_seqid(p->arg.open_seqid);
5343 out_free:
5344         kfree(p);
5345         return NULL;
5346 }
5347
5348 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5349 {
5350         struct nfs4_lockdata *data = calldata;
5351         struct nfs4_state *state = data->lsp->ls_state;
5352
5353         dprintk("%s: begin!\n", __func__);
5354         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5355                 goto out_wait;
5356         /* Do we need to do an open_to_lock_owner? */
5357         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5358                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5359                         goto out_release_lock_seqid;
5360                 }
5361                 data->arg.open_stateid = &state->open_stateid;
5362                 data->arg.new_lock_owner = 1;
5363                 data->res.open_seqid = data->arg.open_seqid;
5364         } else
5365                 data->arg.new_lock_owner = 0;
5366         if (!nfs4_valid_open_stateid(state)) {
5367                 data->rpc_status = -EBADF;
5368                 task->tk_action = NULL;
5369                 goto out_release_open_seqid;
5370         }
5371         data->timestamp = jiffies;
5372         if (nfs4_setup_sequence(data->server,
5373                                 &data->arg.seq_args,
5374                                 &data->res.seq_res,
5375                                 task) == 0)
5376                 return;
5377 out_release_open_seqid:
5378         nfs_release_seqid(data->arg.open_seqid);
5379 out_release_lock_seqid:
5380         nfs_release_seqid(data->arg.lock_seqid);
5381 out_wait:
5382         nfs4_sequence_done(task, &data->res.seq_res);
5383         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5384 }
5385
5386 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5387 {
5388         struct nfs4_lockdata *data = calldata;
5389
5390         dprintk("%s: begin!\n", __func__);
5391
5392         if (!nfs4_sequence_done(task, &data->res.seq_res))
5393                 return;
5394
5395         data->rpc_status = task->tk_status;
5396         if (data->arg.new_lock_owner != 0) {
5397                 if (data->rpc_status == 0)
5398                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5399                 else
5400                         goto out;
5401         }
5402         if (data->rpc_status == 0) {
5403                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5404                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5405                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5406         }
5407 out:
5408         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5409 }
5410
5411 static void nfs4_lock_release(void *calldata)
5412 {
5413         struct nfs4_lockdata *data = calldata;
5414
5415         dprintk("%s: begin!\n", __func__);
5416         nfs_free_seqid(data->arg.open_seqid);
5417         if (data->cancelled != 0) {
5418                 struct rpc_task *task;
5419                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5420                                 data->arg.lock_seqid);
5421                 if (!IS_ERR(task))
5422                         rpc_put_task_async(task);
5423                 dprintk("%s: cancelling lock!\n", __func__);
5424         } else
5425                 nfs_free_seqid(data->arg.lock_seqid);
5426         nfs4_put_lock_state(data->lsp);
5427         put_nfs_open_context(data->ctx);
5428         kfree(data);
5429         dprintk("%s: done!\n", __func__);
5430 }
5431
5432 static const struct rpc_call_ops nfs4_lock_ops = {
5433         .rpc_call_prepare = nfs4_lock_prepare,
5434         .rpc_call_done = nfs4_lock_done,
5435         .rpc_release = nfs4_lock_release,
5436 };
5437
5438 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5439 {
5440         switch (error) {
5441         case -NFS4ERR_ADMIN_REVOKED:
5442         case -NFS4ERR_BAD_STATEID:
5443                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5444                 if (new_lock_owner != 0 ||
5445                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5446                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5447                 break;
5448         case -NFS4ERR_STALE_STATEID:
5449                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5450         case -NFS4ERR_EXPIRED:
5451                 nfs4_schedule_lease_recovery(server->nfs_client);
5452         };
5453 }
5454
5455 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5456 {
5457         struct nfs4_lockdata *data;
5458         struct rpc_task *task;
5459         struct rpc_message msg = {
5460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5461                 .rpc_cred = state->owner->so_cred,
5462         };
5463         struct rpc_task_setup task_setup_data = {
5464                 .rpc_client = NFS_CLIENT(state->inode),
5465                 .rpc_message = &msg,
5466                 .callback_ops = &nfs4_lock_ops,
5467                 .workqueue = nfsiod_workqueue,
5468                 .flags = RPC_TASK_ASYNC,
5469         };
5470         int ret;
5471
5472         dprintk("%s: begin!\n", __func__);
5473         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5474                         fl->fl_u.nfs4_fl.owner,
5475                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5476         if (data == NULL)
5477                 return -ENOMEM;
5478         if (IS_SETLKW(cmd))
5479                 data->arg.block = 1;
5480         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5481         msg.rpc_argp = &data->arg;
5482         msg.rpc_resp = &data->res;
5483         task_setup_data.callback_data = data;
5484         if (recovery_type > NFS_LOCK_NEW) {
5485                 if (recovery_type == NFS_LOCK_RECLAIM)
5486                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5487                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5488         }
5489         task = rpc_run_task(&task_setup_data);
5490         if (IS_ERR(task))
5491                 return PTR_ERR(task);
5492         ret = nfs4_wait_for_completion_rpc_task(task);
5493         if (ret == 0) {
5494                 ret = data->rpc_status;
5495                 if (ret)
5496                         nfs4_handle_setlk_error(data->server, data->lsp,
5497                                         data->arg.new_lock_owner, ret);
5498         } else
5499                 data->cancelled = 1;
5500         rpc_put_task(task);
5501         dprintk("%s: done, ret = %d!\n", __func__, ret);
5502         return ret;
5503 }
5504
5505 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5506 {
5507         struct nfs_server *server = NFS_SERVER(state->inode);
5508         struct nfs4_exception exception = {
5509                 .inode = state->inode,
5510         };
5511         int err;
5512
5513         do {
5514                 /* Cache the lock if possible... */
5515                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5516                         return 0;
5517                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5518                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5519                 if (err != -NFS4ERR_DELAY)
5520                         break;
5521                 nfs4_handle_exception(server, err, &exception);
5522         } while (exception.retry);
5523         return err;
5524 }
5525
5526 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5527 {
5528         struct nfs_server *server = NFS_SERVER(state->inode);
5529         struct nfs4_exception exception = {
5530                 .inode = state->inode,
5531         };
5532         int err;
5533
5534         err = nfs4_set_lock_state(state, request);
5535         if (err != 0)
5536                 return err;
5537         if (!recover_lost_locks) {
5538                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5539                 return 0;
5540         }
5541         do {
5542                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5543                         return 0;
5544                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5545                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5546                 switch (err) {
5547                 default:
5548                         goto out;
5549                 case -NFS4ERR_GRACE:
5550                 case -NFS4ERR_DELAY:
5551                         nfs4_handle_exception(server, err, &exception);
5552                         err = 0;
5553                 }
5554         } while (exception.retry);
5555 out:
5556         return err;
5557 }
5558
5559 #if defined(CONFIG_NFS_V4_1)
5560 /**
5561  * nfs41_check_expired_locks - possibly free a lock stateid
5562  *
5563  * @state: NFSv4 state for an inode
5564  *
5565  * Returns NFS_OK if recovery for this stateid is now finished.
5566  * Otherwise a negative NFS4ERR value is returned.
5567  */
5568 static int nfs41_check_expired_locks(struct nfs4_state *state)
5569 {
5570         int status, ret = -NFS4ERR_BAD_STATEID;
5571         struct nfs4_lock_state *lsp;
5572         struct nfs_server *server = NFS_SERVER(state->inode);
5573
5574         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5575                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5576                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5577
5578                         status = nfs41_test_stateid(server,
5579                                         &lsp->ls_stateid,
5580                                         cred);
5581                         trace_nfs4_test_lock_stateid(state, lsp, status);
5582                         if (status != NFS_OK) {
5583                                 /* Free the stateid unless the server
5584                                  * informs us the stateid is unrecognized. */
5585                                 if (status != -NFS4ERR_BAD_STATEID)
5586                                         nfs41_free_stateid(server,
5587                                                         &lsp->ls_stateid,
5588                                                         cred);
5589                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5590                                 ret = status;
5591                         }
5592                 }
5593         };
5594
5595         return ret;
5596 }
5597
5598 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5599 {
5600         int status = NFS_OK;
5601
5602         if (test_bit(LK_STATE_IN_USE, &state->flags))
5603                 status = nfs41_check_expired_locks(state);
5604         if (status != NFS_OK)
5605                 status = nfs4_lock_expired(state, request);
5606         return status;
5607 }
5608 #endif
5609
5610 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5611 {
5612         struct nfs4_state_owner *sp = state->owner;
5613         struct nfs_inode *nfsi = NFS_I(state->inode);
5614         unsigned char fl_flags = request->fl_flags;
5615         unsigned int seq;
5616         int status = -ENOLCK;
5617
5618         if ((fl_flags & FL_POSIX) &&
5619                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5620                 goto out;
5621         /* Is this a delegated open? */
5622         status = nfs4_set_lock_state(state, request);
5623         if (status != 0)
5624                 goto out;
5625         request->fl_flags |= FL_ACCESS;
5626         status = do_vfs_lock(request->fl_file, request);
5627         if (status < 0)
5628                 goto out;
5629         down_read(&nfsi->rwsem);
5630         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5631                 /* Yes: cache locks! */
5632                 /* ...but avoid races with delegation recall... */
5633                 request->fl_flags = fl_flags & ~FL_SLEEP;
5634                 status = do_vfs_lock(request->fl_file, request);
5635                 goto out_unlock;
5636         }
5637         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5638         up_read(&nfsi->rwsem);
5639         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5640         if (status != 0)
5641                 goto out;
5642         down_read(&nfsi->rwsem);
5643         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5644                 status = -NFS4ERR_DELAY;
5645                 goto out_unlock;
5646         }
5647         /* Note: we always want to sleep here! */
5648         request->fl_flags = fl_flags | FL_SLEEP;
5649         if (do_vfs_lock(request->fl_file, request) < 0)
5650                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5651                         "manager!\n", __func__);
5652 out_unlock:
5653         up_read(&nfsi->rwsem);
5654 out:
5655         request->fl_flags = fl_flags;
5656         return status;
5657 }
5658
5659 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5660 {
5661         struct nfs4_exception exception = {
5662                 .state = state,
5663                 .inode = state->inode,
5664         };
5665         int err;
5666
5667         do {
5668                 err = _nfs4_proc_setlk(state, cmd, request);
5669                 trace_nfs4_set_lock(request, state, cmd, err);
5670                 if (err == -NFS4ERR_DENIED)
5671                         err = -EAGAIN;
5672                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5673                                 err, &exception);
5674         } while (exception.retry);
5675         return err;
5676 }
5677
5678 static int
5679 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5680 {
5681         struct nfs_open_context *ctx;
5682         struct nfs4_state *state;
5683         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5684         int status;
5685
5686         /* verify open state */
5687         ctx = nfs_file_open_context(filp);
5688         state = ctx->state;
5689
5690         if (request->fl_start < 0 || request->fl_end < 0)
5691                 return -EINVAL;
5692
5693         if (IS_GETLK(cmd)) {
5694                 if (state != NULL)
5695                         return nfs4_proc_getlk(state, F_GETLK, request);
5696                 return 0;
5697         }
5698
5699         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5700                 return -EINVAL;
5701
5702         if (request->fl_type == F_UNLCK) {
5703                 if (state != NULL)
5704                         return nfs4_proc_unlck(state, cmd, request);
5705                 return 0;
5706         }
5707
5708         if (state == NULL)
5709                 return -ENOLCK;
5710         /*
5711          * Don't rely on the VFS having checked the file open mode,
5712          * since it won't do this for flock() locks.
5713          */
5714         switch (request->fl_type) {
5715         case F_RDLCK:
5716                 if (!(filp->f_mode & FMODE_READ))
5717                         return -EBADF;
5718                 break;
5719         case F_WRLCK:
5720                 if (!(filp->f_mode & FMODE_WRITE))
5721                         return -EBADF;
5722         }
5723
5724         do {
5725                 status = nfs4_proc_setlk(state, cmd, request);
5726                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5727                         break;
5728                 timeout = nfs4_set_lock_task_retry(timeout);
5729                 status = -ERESTARTSYS;
5730                 if (signalled())
5731                         break;
5732         } while(status < 0);
5733         return status;
5734 }
5735
5736 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5737 {
5738         struct nfs_server *server = NFS_SERVER(state->inode);
5739         int err;
5740
5741         err = nfs4_set_lock_state(state, fl);
5742         if (err != 0)
5743                 return err;
5744         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5745         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5746 }
5747
5748 struct nfs_release_lockowner_data {
5749         struct nfs4_lock_state *lsp;
5750         struct nfs_server *server;
5751         struct nfs_release_lockowner_args args;
5752         struct nfs4_sequence_args seq_args;
5753         struct nfs4_sequence_res seq_res;
5754 };
5755
5756 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5757 {
5758         struct nfs_release_lockowner_data *data = calldata;
5759         nfs40_setup_sequence(data->server,
5760                                 &data->seq_args, &data->seq_res, task);
5761 }
5762
5763 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5764 {
5765         struct nfs_release_lockowner_data *data = calldata;
5766         nfs40_sequence_done(task, &data->seq_res);
5767 }
5768
5769 static void nfs4_release_lockowner_release(void *calldata)
5770 {
5771         struct nfs_release_lockowner_data *data = calldata;
5772         nfs4_free_lock_state(data->server, data->lsp);
5773         kfree(calldata);
5774 }
5775
5776 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5777         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5778         .rpc_call_done = nfs4_release_lockowner_done,
5779         .rpc_release = nfs4_release_lockowner_release,
5780 };
5781
5782 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5783 {
5784         struct nfs_release_lockowner_data *data;
5785         struct rpc_message msg = {
5786                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5787         };
5788
5789         if (server->nfs_client->cl_mvops->minor_version != 0)
5790                 return -EINVAL;
5791
5792         data = kmalloc(sizeof(*data), GFP_NOFS);
5793         if (!data)
5794                 return -ENOMEM;
5795         nfs4_init_sequence(&data->seq_args, &data->seq_res, 0);
5796         data->lsp = lsp;
5797         data->server = server;
5798         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5799         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5800         data->args.lock_owner.s_dev = server->s_dev;
5801
5802         msg.rpc_argp = &data->args;
5803         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5804         return 0;
5805 }
5806
5807 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5808
5809 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5810                                    const void *buf, size_t buflen,
5811                                    int flags, int type)
5812 {
5813         if (strcmp(key, "") != 0)
5814                 return -EINVAL;
5815
5816         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5817 }
5818
5819 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5820                                    void *buf, size_t buflen, int type)
5821 {
5822         if (strcmp(key, "") != 0)
5823                 return -EINVAL;
5824
5825         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5826 }
5827
5828 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5829                                        size_t list_len, const char *name,
5830                                        size_t name_len, int type)
5831 {
5832         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5833
5834         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5835                 return 0;
5836
5837         if (list && len <= list_len)
5838                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5839         return len;
5840 }
5841
5842 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5843 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5844 {
5845         return server->caps & NFS_CAP_SECURITY_LABEL;
5846 }
5847
5848 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5849                                    const void *buf, size_t buflen,
5850                                    int flags, int type)
5851 {
5852         if (security_ismaclabel(key))
5853                 return nfs4_set_security_label(dentry, buf, buflen);
5854
5855         return -EOPNOTSUPP;
5856 }
5857
5858 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5859                                    void *buf, size_t buflen, int type)
5860 {
5861         if (security_ismaclabel(key))
5862                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5863         return -EOPNOTSUPP;
5864 }
5865
5866 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5867                                        size_t list_len, const char *name,
5868                                        size_t name_len, int type)
5869 {
5870         size_t len = 0;
5871
5872         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5873                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5874                 if (list && len <= list_len)
5875                         security_inode_listsecurity(dentry->d_inode, list, len);
5876         }
5877         return len;
5878 }
5879
5880 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5881         .prefix = XATTR_SECURITY_PREFIX,
5882         .list   = nfs4_xattr_list_nfs4_label,
5883         .get    = nfs4_xattr_get_nfs4_label,
5884         .set    = nfs4_xattr_set_nfs4_label,
5885 };
5886 #endif
5887
5888
5889 /*
5890  * nfs_fhget will use either the mounted_on_fileid or the fileid
5891  */
5892 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5893 {
5894         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5895                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5896               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5897               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5898                 return;
5899
5900         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5901                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5902         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5903         fattr->nlink = 2;
5904 }
5905
5906 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5907                                    const struct qstr *name,
5908                                    struct nfs4_fs_locations *fs_locations,
5909                                    struct page *page)
5910 {
5911         struct nfs_server *server = NFS_SERVER(dir);
5912         u32 bitmask[3] = {
5913                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5914         };
5915         struct nfs4_fs_locations_arg args = {
5916                 .dir_fh = NFS_FH(dir),
5917                 .name = name,
5918                 .page = page,
5919                 .bitmask = bitmask,
5920         };
5921         struct nfs4_fs_locations_res res = {
5922                 .fs_locations = fs_locations,
5923         };
5924         struct rpc_message msg = {
5925                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5926                 .rpc_argp = &args,
5927                 .rpc_resp = &res,
5928         };
5929         int status;
5930
5931         dprintk("%s: start\n", __func__);
5932
5933         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5934          * is not supported */
5935         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5936                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5937         else
5938                 bitmask[0] |= FATTR4_WORD0_FILEID;
5939
5940         nfs_fattr_init(&fs_locations->fattr);
5941         fs_locations->server = server;
5942         fs_locations->nlocations = 0;
5943         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5944         dprintk("%s: returned status = %d\n", __func__, status);
5945         return status;
5946 }
5947
5948 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5949                            const struct qstr *name,
5950                            struct nfs4_fs_locations *fs_locations,
5951                            struct page *page)
5952 {
5953         struct nfs4_exception exception = { };
5954         int err;
5955         do {
5956                 err = _nfs4_proc_fs_locations(client, dir, name,
5957                                 fs_locations, page);
5958                 trace_nfs4_get_fs_locations(dir, name, err);
5959                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5960                                 &exception);
5961         } while (exception.retry);
5962         return err;
5963 }
5964
5965 /**
5966  * If 'use_integrity' is true and the state managment nfs_client
5967  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
5968  * and the machine credential as per RFC3530bis and RFC5661 Security
5969  * Considerations sections. Otherwise, just use the user cred with the
5970  * filesystem's rpc_client.
5971  */
5972 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
5973 {
5974         int status;
5975         struct nfs4_secinfo_arg args = {
5976                 .dir_fh = NFS_FH(dir),
5977                 .name   = name,
5978         };
5979         struct nfs4_secinfo_res res = {
5980                 .flavors     = flavors,
5981         };
5982         struct rpc_message msg = {
5983                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5984                 .rpc_argp = &args,
5985                 .rpc_resp = &res,
5986         };
5987         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
5988
5989         if (use_integrity) {
5990                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
5991                 msg.rpc_cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
5992         }
5993
5994         dprintk("NFS call  secinfo %s\n", name->name);
5995         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
5996                                 &res.seq_res, 0);
5997         dprintk("NFS reply  secinfo: %d\n", status);
5998
5999         if (msg.rpc_cred)
6000                 put_rpccred(msg.rpc_cred);
6001
6002         return status;
6003 }
6004
6005 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6006                       struct nfs4_secinfo_flavors *flavors)
6007 {
6008         struct nfs4_exception exception = { };
6009         int err;
6010         do {
6011                 err = -NFS4ERR_WRONGSEC;
6012
6013                 /* try to use integrity protection with machine cred */
6014                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6015                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6016
6017                 /*
6018                  * if unable to use integrity protection, or SECINFO with
6019                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6020                  * disallowed by spec, but exists in deployed servers) use
6021                  * the current filesystem's rpc_client and the user cred.
6022                  */
6023                 if (err == -NFS4ERR_WRONGSEC)
6024                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6025
6026                 trace_nfs4_secinfo(dir, name, err);
6027                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6028                                 &exception);
6029         } while (exception.retry);
6030         return err;
6031 }
6032
6033 #ifdef CONFIG_NFS_V4_1
6034 /*
6035  * Check the exchange flags returned by the server for invalid flags, having
6036  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6037  * DS flags set.
6038  */
6039 static int nfs4_check_cl_exchange_flags(u32 flags)
6040 {
6041         if (flags & ~EXCHGID4_FLAG_MASK_R)
6042                 goto out_inval;
6043         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6044             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6045                 goto out_inval;
6046         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6047                 goto out_inval;
6048         return NFS_OK;
6049 out_inval:
6050         return -NFS4ERR_INVAL;
6051 }
6052
6053 static bool
6054 nfs41_same_server_scope(struct nfs41_server_scope *a,
6055                         struct nfs41_server_scope *b)
6056 {
6057         if (a->server_scope_sz == b->server_scope_sz &&
6058             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6059                 return true;
6060
6061         return false;
6062 }
6063
6064 /*
6065  * nfs4_proc_bind_conn_to_session()
6066  *
6067  * The 4.1 client currently uses the same TCP connection for the
6068  * fore and backchannel.
6069  */
6070 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6071 {
6072         int status;
6073         struct nfs41_bind_conn_to_session_res res;
6074         struct rpc_message msg = {
6075                 .rpc_proc =
6076                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6077                 .rpc_argp = clp,
6078                 .rpc_resp = &res,
6079                 .rpc_cred = cred,
6080         };
6081
6082         dprintk("--> %s\n", __func__);
6083
6084         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6085         if (unlikely(res.session == NULL)) {
6086                 status = -ENOMEM;
6087                 goto out;
6088         }
6089
6090         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6091         trace_nfs4_bind_conn_to_session(clp, status);
6092         if (status == 0) {
6093                 if (memcmp(res.session->sess_id.data,
6094                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6095                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6096                         status = -EIO;
6097                         goto out_session;
6098                 }
6099                 if (res.dir != NFS4_CDFS4_BOTH) {
6100                         dprintk("NFS: %s: Unexpected direction from server\n",
6101                                 __func__);
6102                         status = -EIO;
6103                         goto out_session;
6104                 }
6105                 if (res.use_conn_in_rdma_mode) {
6106                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6107                                 __func__);
6108                         status = -EIO;
6109                         goto out_session;
6110                 }
6111         }
6112 out_session:
6113         kfree(res.session);
6114 out:
6115         dprintk("<-- %s status= %d\n", __func__, status);
6116         return status;
6117 }
6118
6119 /*
6120  * nfs4_proc_exchange_id()
6121  *
6122  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6123  *
6124  * Since the clientid has expired, all compounds using sessions
6125  * associated with the stale clientid will be returning
6126  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6127  * be in some phase of session reset.
6128  */
6129 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6130 {
6131         nfs4_verifier verifier;
6132         struct nfs41_exchange_id_args args = {
6133                 .verifier = &verifier,
6134                 .client = clp,
6135                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6136                         EXCHGID4_FLAG_BIND_PRINC_STATEID,
6137         };
6138         struct nfs41_exchange_id_res res = {
6139                 0
6140         };
6141         int status;
6142         struct rpc_message msg = {
6143                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6144                 .rpc_argp = &args,
6145                 .rpc_resp = &res,
6146                 .rpc_cred = cred,
6147         };
6148
6149         nfs4_init_boot_verifier(clp, &verifier);
6150         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6151                                                         sizeof(args.id));
6152         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6153                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6154                 args.id_len, args.id);
6155
6156         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6157                                         GFP_NOFS);
6158         if (unlikely(res.server_owner == NULL)) {
6159                 status = -ENOMEM;
6160                 goto out;
6161         }
6162
6163         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6164                                         GFP_NOFS);
6165         if (unlikely(res.server_scope == NULL)) {
6166                 status = -ENOMEM;
6167                 goto out_server_owner;
6168         }
6169
6170         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6171         if (unlikely(res.impl_id == NULL)) {
6172                 status = -ENOMEM;
6173                 goto out_server_scope;
6174         }
6175
6176         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6177         trace_nfs4_exchange_id(clp, status);
6178         if (status == 0)
6179                 status = nfs4_check_cl_exchange_flags(res.flags);
6180
6181         if (status == 0) {
6182                 clp->cl_clientid = res.clientid;
6183                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6184                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6185                         clp->cl_seqid = res.seqid;
6186
6187                 kfree(clp->cl_serverowner);
6188                 clp->cl_serverowner = res.server_owner;
6189                 res.server_owner = NULL;
6190
6191                 /* use the most recent implementation id */
6192                 kfree(clp->cl_implid);
6193                 clp->cl_implid = res.impl_id;
6194
6195                 if (clp->cl_serverscope != NULL &&
6196                     !nfs41_same_server_scope(clp->cl_serverscope,
6197                                              res.server_scope)) {
6198                         dprintk("%s: server_scope mismatch detected\n",
6199                                 __func__);
6200                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6201                         kfree(clp->cl_serverscope);
6202                         clp->cl_serverscope = NULL;
6203                 }
6204
6205                 if (clp->cl_serverscope == NULL) {
6206                         clp->cl_serverscope = res.server_scope;
6207                         goto out;
6208                 }
6209         } else
6210                 kfree(res.impl_id);
6211
6212 out_server_owner:
6213         kfree(res.server_owner);
6214 out_server_scope:
6215         kfree(res.server_scope);
6216 out:
6217         if (clp->cl_implid != NULL)
6218                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6219                         "domain: %s, name: %s, date: %llu,%u\n",
6220                         clp->cl_implid->domain, clp->cl_implid->name,
6221                         clp->cl_implid->date.seconds,
6222                         clp->cl_implid->date.nseconds);
6223         dprintk("NFS reply exchange_id: %d\n", status);
6224         return status;
6225 }
6226
6227 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6228                 struct rpc_cred *cred)
6229 {
6230         struct rpc_message msg = {
6231                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6232                 .rpc_argp = clp,
6233                 .rpc_cred = cred,
6234         };
6235         int status;
6236
6237         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6238         trace_nfs4_destroy_clientid(clp, status);
6239         if (status)
6240                 dprintk("NFS: Got error %d from the server %s on "
6241                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6242         return status;
6243 }
6244
6245 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6246                 struct rpc_cred *cred)
6247 {
6248         unsigned int loop;
6249         int ret;
6250
6251         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6252                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6253                 switch (ret) {
6254                 case -NFS4ERR_DELAY:
6255                 case -NFS4ERR_CLIENTID_BUSY:
6256                         ssleep(1);
6257                         break;
6258                 default:
6259                         return ret;
6260                 }
6261         }
6262         return 0;
6263 }
6264
6265 int nfs4_destroy_clientid(struct nfs_client *clp)
6266 {
6267         struct rpc_cred *cred;
6268         int ret = 0;
6269
6270         if (clp->cl_mvops->minor_version < 1)
6271                 goto out;
6272         if (clp->cl_exchange_flags == 0)
6273                 goto out;
6274         if (clp->cl_preserve_clid)
6275                 goto out;
6276         cred = nfs4_get_clid_cred(clp);
6277         ret = nfs4_proc_destroy_clientid(clp, cred);
6278         if (cred)
6279                 put_rpccred(cred);
6280         switch (ret) {
6281         case 0:
6282         case -NFS4ERR_STALE_CLIENTID:
6283                 clp->cl_exchange_flags = 0;
6284         }
6285 out:
6286         return ret;
6287 }
6288
6289 struct nfs4_get_lease_time_data {
6290         struct nfs4_get_lease_time_args *args;
6291         struct nfs4_get_lease_time_res *res;
6292         struct nfs_client *clp;
6293 };
6294
6295 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6296                                         void *calldata)
6297 {
6298         struct nfs4_get_lease_time_data *data =
6299                         (struct nfs4_get_lease_time_data *)calldata;
6300
6301         dprintk("--> %s\n", __func__);
6302         /* just setup sequence, do not trigger session recovery
6303            since we're invoked within one */
6304         nfs41_setup_sequence(data->clp->cl_session,
6305                         &data->args->la_seq_args,
6306                         &data->res->lr_seq_res,
6307                         task);
6308         dprintk("<-- %s\n", __func__);
6309 }
6310
6311 /*
6312  * Called from nfs4_state_manager thread for session setup, so don't recover
6313  * from sequence operation or clientid errors.
6314  */
6315 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6316 {
6317         struct nfs4_get_lease_time_data *data =
6318                         (struct nfs4_get_lease_time_data *)calldata;
6319
6320         dprintk("--> %s\n", __func__);
6321         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6322                 return;
6323         switch (task->tk_status) {
6324         case -NFS4ERR_DELAY:
6325         case -NFS4ERR_GRACE:
6326                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6327                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6328                 task->tk_status = 0;
6329                 /* fall through */
6330         case -NFS4ERR_RETRY_UNCACHED_REP:
6331                 rpc_restart_call_prepare(task);
6332                 return;
6333         }
6334         dprintk("<-- %s\n", __func__);
6335 }
6336
6337 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6338         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6339         .rpc_call_done = nfs4_get_lease_time_done,
6340 };
6341
6342 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6343 {
6344         struct rpc_task *task;
6345         struct nfs4_get_lease_time_args args;
6346         struct nfs4_get_lease_time_res res = {
6347                 .lr_fsinfo = fsinfo,
6348         };
6349         struct nfs4_get_lease_time_data data = {
6350                 .args = &args,
6351                 .res = &res,
6352                 .clp = clp,
6353         };
6354         struct rpc_message msg = {
6355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6356                 .rpc_argp = &args,
6357                 .rpc_resp = &res,
6358         };
6359         struct rpc_task_setup task_setup = {
6360                 .rpc_client = clp->cl_rpcclient,
6361                 .rpc_message = &msg,
6362                 .callback_ops = &nfs4_get_lease_time_ops,
6363                 .callback_data = &data,
6364                 .flags = RPC_TASK_TIMEOUT,
6365         };
6366         int status;
6367
6368         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6369         nfs4_set_sequence_privileged(&args.la_seq_args);
6370         dprintk("--> %s\n", __func__);
6371         task = rpc_run_task(&task_setup);
6372
6373         if (IS_ERR(task))
6374                 status = PTR_ERR(task);
6375         else {
6376                 status = task->tk_status;
6377                 rpc_put_task(task);
6378         }
6379         dprintk("<-- %s return %d\n", __func__, status);
6380
6381         return status;
6382 }
6383
6384 /*
6385  * Initialize the values to be used by the client in CREATE_SESSION
6386  * If nfs4_init_session set the fore channel request and response sizes,
6387  * use them.
6388  *
6389  * Set the back channel max_resp_sz_cached to zero to force the client to
6390  * always set csa_cachethis to FALSE because the current implementation
6391  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6392  */
6393 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6394 {
6395         unsigned int max_rqst_sz, max_resp_sz;
6396
6397         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6398         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6399
6400         /* Fore channel attributes */
6401         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6402         args->fc_attrs.max_resp_sz = max_resp_sz;
6403         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6404         args->fc_attrs.max_reqs = max_session_slots;
6405
6406         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6407                 "max_ops=%u max_reqs=%u\n",
6408                 __func__,
6409                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6410                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6411
6412         /* Back channel attributes */
6413         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6414         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6415         args->bc_attrs.max_resp_sz_cached = 0;
6416         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6417         args->bc_attrs.max_reqs = 1;
6418
6419         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6420                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6421                 __func__,
6422                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6423                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6424                 args->bc_attrs.max_reqs);
6425 }
6426
6427 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6428 {
6429         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6430         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6431
6432         if (rcvd->max_resp_sz > sent->max_resp_sz)
6433                 return -EINVAL;
6434         /*
6435          * Our requested max_ops is the minimum we need; we're not
6436          * prepared to break up compounds into smaller pieces than that.
6437          * So, no point even trying to continue if the server won't
6438          * cooperate:
6439          */
6440         if (rcvd->max_ops < sent->max_ops)
6441                 return -EINVAL;
6442         if (rcvd->max_reqs == 0)
6443                 return -EINVAL;
6444         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6445                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6446         return 0;
6447 }
6448
6449 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6450 {
6451         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6452         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6453
6454         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6455                 return -EINVAL;
6456         if (rcvd->max_resp_sz < sent->max_resp_sz)
6457                 return -EINVAL;
6458         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6459                 return -EINVAL;
6460         /* These would render the backchannel useless: */
6461         if (rcvd->max_ops != sent->max_ops)
6462                 return -EINVAL;
6463         if (rcvd->max_reqs != sent->max_reqs)
6464                 return -EINVAL;
6465         return 0;
6466 }
6467
6468 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6469                                      struct nfs4_session *session)
6470 {
6471         int ret;
6472
6473         ret = nfs4_verify_fore_channel_attrs(args, session);
6474         if (ret)
6475                 return ret;
6476         return nfs4_verify_back_channel_attrs(args, session);
6477 }
6478
6479 static int _nfs4_proc_create_session(struct nfs_client *clp,
6480                 struct rpc_cred *cred)
6481 {
6482         struct nfs4_session *session = clp->cl_session;
6483         struct nfs41_create_session_args args = {
6484                 .client = clp,
6485                 .cb_program = NFS4_CALLBACK,
6486         };
6487         struct nfs41_create_session_res res = {
6488                 .client = clp,
6489         };
6490         struct rpc_message msg = {
6491                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6492                 .rpc_argp = &args,
6493                 .rpc_resp = &res,
6494                 .rpc_cred = cred,
6495         };
6496         int status;
6497
6498         nfs4_init_channel_attrs(&args);
6499         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6500
6501         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6502         trace_nfs4_create_session(clp, status);
6503
6504         if (!status) {
6505                 /* Verify the session's negotiated channel_attrs values */
6506                 status = nfs4_verify_channel_attrs(&args, session);
6507                 /* Increment the clientid slot sequence id */
6508                 clp->cl_seqid++;
6509         }
6510
6511         return status;
6512 }
6513
6514 /*
6515  * Issues a CREATE_SESSION operation to the server.
6516  * It is the responsibility of the caller to verify the session is
6517  * expired before calling this routine.
6518  */
6519 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6520 {
6521         int status;
6522         unsigned *ptr;
6523         struct nfs4_session *session = clp->cl_session;
6524
6525         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6526
6527         status = _nfs4_proc_create_session(clp, cred);
6528         if (status)
6529                 goto out;
6530
6531         /* Init or reset the session slot tables */
6532         status = nfs4_setup_session_slot_tables(session);
6533         dprintk("slot table setup returned %d\n", status);
6534         if (status)
6535                 goto out;
6536
6537         ptr = (unsigned *)&session->sess_id.data[0];
6538         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6539                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6540 out:
6541         dprintk("<-- %s\n", __func__);
6542         return status;
6543 }
6544
6545 /*
6546  * Issue the over-the-wire RPC DESTROY_SESSION.
6547  * The caller must serialize access to this routine.
6548  */
6549 int nfs4_proc_destroy_session(struct nfs4_session *session,
6550                 struct rpc_cred *cred)
6551 {
6552         struct rpc_message msg = {
6553                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6554                 .rpc_argp = session,
6555                 .rpc_cred = cred,
6556         };
6557         int status = 0;
6558
6559         dprintk("--> nfs4_proc_destroy_session\n");
6560
6561         /* session is still being setup */
6562         if (session->clp->cl_cons_state != NFS_CS_READY)
6563                 return status;
6564
6565         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6566         trace_nfs4_destroy_session(session->clp, status);
6567
6568         if (status)
6569                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6570                         "Session has been destroyed regardless...\n", status);
6571
6572         dprintk("<-- nfs4_proc_destroy_session\n");
6573         return status;
6574 }
6575
6576 /*
6577  * Renew the cl_session lease.
6578  */
6579 struct nfs4_sequence_data {
6580         struct nfs_client *clp;
6581         struct nfs4_sequence_args args;
6582         struct nfs4_sequence_res res;
6583 };
6584
6585 static void nfs41_sequence_release(void *data)
6586 {
6587         struct nfs4_sequence_data *calldata = data;
6588         struct nfs_client *clp = calldata->clp;
6589
6590         if (atomic_read(&clp->cl_count) > 1)
6591                 nfs4_schedule_state_renewal(clp);
6592         nfs_put_client(clp);
6593         kfree(calldata);
6594 }
6595
6596 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6597 {
6598         switch(task->tk_status) {
6599         case -NFS4ERR_DELAY:
6600                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6601                 return -EAGAIN;
6602         default:
6603                 nfs4_schedule_lease_recovery(clp);
6604         }
6605         return 0;
6606 }
6607
6608 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6609 {
6610         struct nfs4_sequence_data *calldata = data;
6611         struct nfs_client *clp = calldata->clp;
6612
6613         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6614                 return;
6615
6616         trace_nfs4_sequence(clp, task->tk_status);
6617         if (task->tk_status < 0) {
6618                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6619                 if (atomic_read(&clp->cl_count) == 1)
6620                         goto out;
6621
6622                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6623                         rpc_restart_call_prepare(task);
6624                         return;
6625                 }
6626         }
6627         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6628 out:
6629         dprintk("<-- %s\n", __func__);
6630 }
6631
6632 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6633 {
6634         struct nfs4_sequence_data *calldata = data;
6635         struct nfs_client *clp = calldata->clp;
6636         struct nfs4_sequence_args *args;
6637         struct nfs4_sequence_res *res;
6638
6639         args = task->tk_msg.rpc_argp;
6640         res = task->tk_msg.rpc_resp;
6641
6642         nfs41_setup_sequence(clp->cl_session, args, res, task);
6643 }
6644
6645 static const struct rpc_call_ops nfs41_sequence_ops = {
6646         .rpc_call_done = nfs41_sequence_call_done,
6647         .rpc_call_prepare = nfs41_sequence_prepare,
6648         .rpc_release = nfs41_sequence_release,
6649 };
6650
6651 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6652                 struct rpc_cred *cred,
6653                 bool is_privileged)
6654 {
6655         struct nfs4_sequence_data *calldata;
6656         struct rpc_message msg = {
6657                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6658                 .rpc_cred = cred,
6659         };
6660         struct rpc_task_setup task_setup_data = {
6661                 .rpc_client = clp->cl_rpcclient,
6662                 .rpc_message = &msg,
6663                 .callback_ops = &nfs41_sequence_ops,
6664                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6665         };
6666
6667         if (!atomic_inc_not_zero(&clp->cl_count))
6668                 return ERR_PTR(-EIO);
6669         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6670         if (calldata == NULL) {
6671                 nfs_put_client(clp);
6672                 return ERR_PTR(-ENOMEM);
6673         }
6674         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
6675         if (is_privileged)
6676                 nfs4_set_sequence_privileged(&calldata->args);
6677         msg.rpc_argp = &calldata->args;
6678         msg.rpc_resp = &calldata->res;
6679         calldata->clp = clp;
6680         task_setup_data.callback_data = calldata;
6681
6682         return rpc_run_task(&task_setup_data);
6683 }
6684
6685 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6686 {
6687         struct rpc_task *task;
6688         int ret = 0;
6689
6690         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6691                 return 0;
6692         task = _nfs41_proc_sequence(clp, cred, false);
6693         if (IS_ERR(task))
6694                 ret = PTR_ERR(task);
6695         else
6696                 rpc_put_task_async(task);
6697         dprintk("<-- %s status=%d\n", __func__, ret);
6698         return ret;
6699 }
6700
6701 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6702 {
6703         struct rpc_task *task;
6704         int ret;
6705
6706         task = _nfs41_proc_sequence(clp, cred, true);
6707         if (IS_ERR(task)) {
6708                 ret = PTR_ERR(task);
6709                 goto out;
6710         }
6711         ret = rpc_wait_for_completion_task(task);
6712         if (!ret) {
6713                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6714
6715                 if (task->tk_status == 0)
6716                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6717                 ret = task->tk_status;
6718         }
6719         rpc_put_task(task);
6720 out:
6721         dprintk("<-- %s status=%d\n", __func__, ret);
6722         return ret;
6723 }
6724
6725 struct nfs4_reclaim_complete_data {
6726         struct nfs_client *clp;
6727         struct nfs41_reclaim_complete_args arg;
6728         struct nfs41_reclaim_complete_res res;
6729 };
6730
6731 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6732 {
6733         struct nfs4_reclaim_complete_data *calldata = data;
6734
6735         nfs41_setup_sequence(calldata->clp->cl_session,
6736                         &calldata->arg.seq_args,
6737                         &calldata->res.seq_res,
6738                         task);
6739 }
6740
6741 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6742 {
6743         switch(task->tk_status) {
6744         case 0:
6745         case -NFS4ERR_COMPLETE_ALREADY:
6746         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6747                 break;
6748         case -NFS4ERR_DELAY:
6749                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6750                 /* fall through */
6751         case -NFS4ERR_RETRY_UNCACHED_REP:
6752                 return -EAGAIN;
6753         default:
6754                 nfs4_schedule_lease_recovery(clp);
6755         }
6756         return 0;
6757 }
6758
6759 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6760 {
6761         struct nfs4_reclaim_complete_data *calldata = data;
6762         struct nfs_client *clp = calldata->clp;
6763         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6764
6765         dprintk("--> %s\n", __func__);
6766         if (!nfs41_sequence_done(task, res))
6767                 return;
6768
6769         trace_nfs4_reclaim_complete(clp, task->tk_status);
6770         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6771                 rpc_restart_call_prepare(task);
6772                 return;
6773         }
6774         dprintk("<-- %s\n", __func__);
6775 }
6776
6777 static void nfs4_free_reclaim_complete_data(void *data)
6778 {
6779         struct nfs4_reclaim_complete_data *calldata = data;
6780
6781         kfree(calldata);
6782 }
6783
6784 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6785         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6786         .rpc_call_done = nfs4_reclaim_complete_done,
6787         .rpc_release = nfs4_free_reclaim_complete_data,
6788 };
6789
6790 /*
6791  * Issue a global reclaim complete.
6792  */
6793 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
6794                 struct rpc_cred *cred)
6795 {
6796         struct nfs4_reclaim_complete_data *calldata;
6797         struct rpc_task *task;
6798         struct rpc_message msg = {
6799                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6800                 .rpc_cred = cred,
6801         };
6802         struct rpc_task_setup task_setup_data = {
6803                 .rpc_client = clp->cl_rpcclient,
6804                 .rpc_message = &msg,
6805                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6806                 .flags = RPC_TASK_ASYNC,
6807         };
6808         int status = -ENOMEM;
6809
6810         dprintk("--> %s\n", __func__);
6811         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6812         if (calldata == NULL)
6813                 goto out;
6814         calldata->clp = clp;
6815         calldata->arg.one_fs = 0;
6816
6817         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6818         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
6819         msg.rpc_argp = &calldata->arg;
6820         msg.rpc_resp = &calldata->res;
6821         task_setup_data.callback_data = calldata;
6822         task = rpc_run_task(&task_setup_data);
6823         if (IS_ERR(task)) {
6824                 status = PTR_ERR(task);
6825                 goto out;
6826         }
6827         status = nfs4_wait_for_completion_rpc_task(task);
6828         if (status == 0)
6829                 status = task->tk_status;
6830         rpc_put_task(task);
6831         return 0;
6832 out:
6833         dprintk("<-- %s status=%d\n", __func__, status);
6834         return status;
6835 }
6836
6837 static void
6838 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6839 {
6840         struct nfs4_layoutget *lgp = calldata;
6841         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6842         struct nfs4_session *session = nfs4_get_session(server);
6843
6844         dprintk("--> %s\n", __func__);
6845         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6846          * right now covering the LAYOUTGET we are about to send.
6847          * However, that is not so catastrophic, and there seems
6848          * to be no way to prevent it completely.
6849          */
6850         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
6851                                 &lgp->res.seq_res, task))
6852                 return;
6853         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6854                                           NFS_I(lgp->args.inode)->layout,
6855                                           lgp->args.ctx->state)) {
6856                 rpc_exit(task, NFS4_OK);
6857         }
6858 }
6859
6860 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6861 {
6862         struct nfs4_layoutget *lgp = calldata;
6863         struct inode *inode = lgp->args.inode;
6864         struct nfs_server *server = NFS_SERVER(inode);
6865         struct pnfs_layout_hdr *lo;
6866         struct nfs4_state *state = NULL;
6867         unsigned long timeo, giveup;
6868
6869         dprintk("--> %s\n", __func__);
6870
6871         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
6872                 goto out;
6873
6874         switch (task->tk_status) {
6875         case 0:
6876                 goto out;
6877         case -NFS4ERR_LAYOUTTRYLATER:
6878         case -NFS4ERR_RECALLCONFLICT:
6879                 timeo = rpc_get_timeout(task->tk_client);
6880                 giveup = lgp->args.timestamp + timeo;
6881                 if (time_after(giveup, jiffies))
6882                         task->tk_status = -NFS4ERR_DELAY;
6883                 break;
6884         case -NFS4ERR_EXPIRED:
6885         case -NFS4ERR_BAD_STATEID:
6886                 spin_lock(&inode->i_lock);
6887                 lo = NFS_I(inode)->layout;
6888                 if (!lo || list_empty(&lo->plh_segs)) {
6889                         spin_unlock(&inode->i_lock);
6890                         /* If the open stateid was bad, then recover it. */
6891                         state = lgp->args.ctx->state;
6892                 } else {
6893                         LIST_HEAD(head);
6894
6895                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6896                         spin_unlock(&inode->i_lock);
6897                         /* Mark the bad layout state as invalid, then
6898                          * retry using the open stateid. */
6899                         pnfs_free_lseg_list(&head);
6900                 }
6901         }
6902         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6903                 rpc_restart_call_prepare(task);
6904 out:
6905         dprintk("<-- %s\n", __func__);
6906 }
6907
6908 static size_t max_response_pages(struct nfs_server *server)
6909 {
6910         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6911         return nfs_page_array_len(0, max_resp_sz);
6912 }
6913
6914 static void nfs4_free_pages(struct page **pages, size_t size)
6915 {
6916         int i;
6917
6918         if (!pages)
6919                 return;
6920
6921         for (i = 0; i < size; i++) {
6922                 if (!pages[i])
6923                         break;
6924                 __free_page(pages[i]);
6925         }
6926         kfree(pages);
6927 }
6928
6929 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6930 {
6931         struct page **pages;
6932         int i;
6933
6934         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6935         if (!pages) {
6936                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6937                 return NULL;
6938         }
6939
6940         for (i = 0; i < size; i++) {
6941                 pages[i] = alloc_page(gfp_flags);
6942                 if (!pages[i]) {
6943                         dprintk("%s: failed to allocate page\n", __func__);
6944                         nfs4_free_pages(pages, size);
6945                         return NULL;
6946                 }
6947         }
6948
6949         return pages;
6950 }
6951
6952 static void nfs4_layoutget_release(void *calldata)
6953 {
6954         struct nfs4_layoutget *lgp = calldata;
6955         struct inode *inode = lgp->args.inode;
6956         struct nfs_server *server = NFS_SERVER(inode);
6957         size_t max_pages = max_response_pages(server);
6958
6959         dprintk("--> %s\n", __func__);
6960         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6961         pnfs_put_layout_hdr(NFS_I(inode)->layout);
6962         put_nfs_open_context(lgp->args.ctx);
6963         kfree(calldata);
6964         dprintk("<-- %s\n", __func__);
6965 }
6966
6967 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6968         .rpc_call_prepare = nfs4_layoutget_prepare,
6969         .rpc_call_done = nfs4_layoutget_done,
6970         .rpc_release = nfs4_layoutget_release,
6971 };
6972
6973 struct pnfs_layout_segment *
6974 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6975 {
6976         struct inode *inode = lgp->args.inode;
6977         struct nfs_server *server = NFS_SERVER(inode);
6978         size_t max_pages = max_response_pages(server);
6979         struct rpc_task *task;
6980         struct rpc_message msg = {
6981                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6982                 .rpc_argp = &lgp->args,
6983                 .rpc_resp = &lgp->res,
6984                 .rpc_cred = lgp->cred,
6985         };
6986         struct rpc_task_setup task_setup_data = {
6987                 .rpc_client = server->client,
6988                 .rpc_message = &msg,
6989                 .callback_ops = &nfs4_layoutget_call_ops,
6990                 .callback_data = lgp,
6991                 .flags = RPC_TASK_ASYNC,
6992         };
6993         struct pnfs_layout_segment *lseg = NULL;
6994         int status = 0;
6995
6996         dprintk("--> %s\n", __func__);
6997
6998         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6999         if (!lgp->args.layout.pages) {
7000                 nfs4_layoutget_release(lgp);
7001                 return ERR_PTR(-ENOMEM);
7002         }
7003         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7004         lgp->args.timestamp = jiffies;
7005
7006         lgp->res.layoutp = &lgp->args.layout;
7007         lgp->res.seq_res.sr_slot = NULL;
7008         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7009
7010         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7011         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7012
7013         task = rpc_run_task(&task_setup_data);
7014         if (IS_ERR(task))
7015                 return ERR_CAST(task);
7016         status = nfs4_wait_for_completion_rpc_task(task);
7017         if (status == 0)
7018                 status = task->tk_status;
7019         trace_nfs4_layoutget(lgp->args.ctx,
7020                         &lgp->args.range,
7021                         &lgp->res.range,
7022                         status);
7023         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7024         if (status == 0 && lgp->res.layoutp->len)
7025                 lseg = pnfs_layout_process(lgp);
7026         rpc_put_task(task);
7027         dprintk("<-- %s status=%d\n", __func__, status);
7028         if (status)
7029                 return ERR_PTR(status);
7030         return lseg;
7031 }
7032
7033 static void
7034 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7035 {
7036         struct nfs4_layoutreturn *lrp = calldata;
7037
7038         dprintk("--> %s\n", __func__);
7039         nfs41_setup_sequence(lrp->clp->cl_session,
7040                         &lrp->args.seq_args,
7041                         &lrp->res.seq_res,
7042                         task);
7043 }
7044
7045 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7046 {
7047         struct nfs4_layoutreturn *lrp = calldata;
7048         struct nfs_server *server;
7049
7050         dprintk("--> %s\n", __func__);
7051
7052         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7053                 return;
7054
7055         server = NFS_SERVER(lrp->args.inode);
7056         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7057                 rpc_restart_call_prepare(task);
7058                 return;
7059         }
7060         dprintk("<-- %s\n", __func__);
7061 }
7062
7063 static void nfs4_layoutreturn_release(void *calldata)
7064 {
7065         struct nfs4_layoutreturn *lrp = calldata;
7066         struct pnfs_layout_hdr *lo = lrp->args.layout;
7067
7068         dprintk("--> %s\n", __func__);
7069         spin_lock(&lo->plh_inode->i_lock);
7070         if (lrp->res.lrs_present)
7071                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7072         lo->plh_block_lgets--;
7073         spin_unlock(&lo->plh_inode->i_lock);
7074         pnfs_put_layout_hdr(lrp->args.layout);
7075         kfree(calldata);
7076         dprintk("<-- %s\n", __func__);
7077 }
7078
7079 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7080         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7081         .rpc_call_done = nfs4_layoutreturn_done,
7082         .rpc_release = nfs4_layoutreturn_release,
7083 };
7084
7085 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7086 {
7087         struct rpc_task *task;
7088         struct rpc_message msg = {
7089                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7090                 .rpc_argp = &lrp->args,
7091                 .rpc_resp = &lrp->res,
7092                 .rpc_cred = lrp->cred,
7093         };
7094         struct rpc_task_setup task_setup_data = {
7095                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7096                 .rpc_message = &msg,
7097                 .callback_ops = &nfs4_layoutreturn_call_ops,
7098                 .callback_data = lrp,
7099         };
7100         int status;
7101
7102         dprintk("--> %s\n", __func__);
7103         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7104         task = rpc_run_task(&task_setup_data);
7105         if (IS_ERR(task))
7106                 return PTR_ERR(task);
7107         status = task->tk_status;
7108         trace_nfs4_layoutreturn(lrp->args.inode, status);
7109         dprintk("<-- %s status=%d\n", __func__, status);
7110         rpc_put_task(task);
7111         return status;
7112 }
7113
7114 /*
7115  * Retrieve the list of Data Server devices from the MDS.
7116  */
7117 static int _nfs4_getdevicelist(struct nfs_server *server,
7118                                     const struct nfs_fh *fh,
7119                                     struct pnfs_devicelist *devlist)
7120 {
7121         struct nfs4_getdevicelist_args args = {
7122                 .fh = fh,
7123                 .layoutclass = server->pnfs_curr_ld->id,
7124         };
7125         struct nfs4_getdevicelist_res res = {
7126                 .devlist = devlist,
7127         };
7128         struct rpc_message msg = {
7129                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7130                 .rpc_argp = &args,
7131                 .rpc_resp = &res,
7132         };
7133         int status;
7134
7135         dprintk("--> %s\n", __func__);
7136         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7137                                 &res.seq_res, 0);
7138         dprintk("<-- %s status=%d\n", __func__, status);
7139         return status;
7140 }
7141
7142 int nfs4_proc_getdevicelist(struct nfs_server *server,
7143                             const struct nfs_fh *fh,
7144                             struct pnfs_devicelist *devlist)
7145 {
7146         struct nfs4_exception exception = { };
7147         int err;
7148
7149         do {
7150                 err = nfs4_handle_exception(server,
7151                                 _nfs4_getdevicelist(server, fh, devlist),
7152                                 &exception);
7153         } while (exception.retry);
7154
7155         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7156                 err, devlist->num_devs);
7157
7158         return err;
7159 }
7160 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7161
7162 static int
7163 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7164                 struct pnfs_device *pdev,
7165                 struct rpc_cred *cred)
7166 {
7167         struct nfs4_getdeviceinfo_args args = {
7168                 .pdev = pdev,
7169         };
7170         struct nfs4_getdeviceinfo_res res = {
7171                 .pdev = pdev,
7172         };
7173         struct rpc_message msg = {
7174                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7175                 .rpc_argp = &args,
7176                 .rpc_resp = &res,
7177                 .rpc_cred = cred,
7178         };
7179         int status;
7180
7181         dprintk("--> %s\n", __func__);
7182         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7183         dprintk("<-- %s status=%d\n", __func__, status);
7184
7185         return status;
7186 }
7187
7188 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7189                 struct pnfs_device *pdev,
7190                 struct rpc_cred *cred)
7191 {
7192         struct nfs4_exception exception = { };
7193         int err;
7194
7195         do {
7196                 err = nfs4_handle_exception(server,
7197                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7198                                         &exception);
7199         } while (exception.retry);
7200         return err;
7201 }
7202 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7203
7204 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7205 {
7206         struct nfs4_layoutcommit_data *data = calldata;
7207         struct nfs_server *server = NFS_SERVER(data->args.inode);
7208         struct nfs4_session *session = nfs4_get_session(server);
7209
7210         nfs41_setup_sequence(session,
7211                         &data->args.seq_args,
7212                         &data->res.seq_res,
7213                         task);
7214 }
7215
7216 static void
7217 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7218 {
7219         struct nfs4_layoutcommit_data *data = calldata;
7220         struct nfs_server *server = NFS_SERVER(data->args.inode);
7221
7222         if (!nfs41_sequence_done(task, &data->res.seq_res))
7223                 return;
7224
7225         switch (task->tk_status) { /* Just ignore these failures */
7226         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7227         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7228         case -NFS4ERR_BADLAYOUT:     /* no layout */
7229         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7230                 task->tk_status = 0;
7231                 break;
7232         case 0:
7233                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7234                                                    data->res.fattr);
7235                 break;
7236         default:
7237                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7238                         rpc_restart_call_prepare(task);
7239                         return;
7240                 }
7241         }
7242 }
7243
7244 static void nfs4_layoutcommit_release(void *calldata)
7245 {
7246         struct nfs4_layoutcommit_data *data = calldata;
7247
7248         pnfs_cleanup_layoutcommit(data);
7249         put_rpccred(data->cred);
7250         kfree(data);
7251 }
7252
7253 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7254         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7255         .rpc_call_done = nfs4_layoutcommit_done,
7256         .rpc_release = nfs4_layoutcommit_release,
7257 };
7258
7259 int
7260 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7261 {
7262         struct rpc_message msg = {
7263                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7264                 .rpc_argp = &data->args,
7265                 .rpc_resp = &data->res,
7266                 .rpc_cred = data->cred,
7267         };
7268         struct rpc_task_setup task_setup_data = {
7269                 .task = &data->task,
7270                 .rpc_client = NFS_CLIENT(data->args.inode),
7271                 .rpc_message = &msg,
7272                 .callback_ops = &nfs4_layoutcommit_ops,
7273                 .callback_data = data,
7274                 .flags = RPC_TASK_ASYNC,
7275         };
7276         struct rpc_task *task;
7277         int status = 0;
7278
7279         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7280                 "lbw: %llu inode %lu\n",
7281                 data->task.tk_pid, sync,
7282                 data->args.lastbytewritten,
7283                 data->args.inode->i_ino);
7284
7285         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7286         task = rpc_run_task(&task_setup_data);
7287         if (IS_ERR(task))
7288                 return PTR_ERR(task);
7289         if (sync == false)
7290                 goto out;
7291         status = nfs4_wait_for_completion_rpc_task(task);
7292         if (status != 0)
7293                 goto out;
7294         status = task->tk_status;
7295         trace_nfs4_layoutcommit(data->args.inode, status);
7296 out:
7297         dprintk("%s: status %d\n", __func__, status);
7298         rpc_put_task(task);
7299         return status;
7300 }
7301
7302 /**
7303  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7304  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7305  */
7306 static int
7307 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7308                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7309 {
7310         struct nfs41_secinfo_no_name_args args = {
7311                 .style = SECINFO_STYLE_CURRENT_FH,
7312         };
7313         struct nfs4_secinfo_res res = {
7314                 .flavors = flavors,
7315         };
7316         struct rpc_message msg = {
7317                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7318                 .rpc_argp = &args,
7319                 .rpc_resp = &res,
7320         };
7321         return nfs4_call_sync(server->nfs_client->cl_rpcclient, server, &msg,
7322                                 &args.seq_args, &res.seq_res, 0);
7323 }
7324
7325 static int
7326 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7327                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7328 {
7329         struct nfs4_exception exception = { };
7330         int err;
7331         do {
7332                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7333                 switch (err) {
7334                 case 0:
7335                 case -NFS4ERR_WRONGSEC:
7336                 case -NFS4ERR_NOTSUPP:
7337                         goto out;
7338                 default:
7339                         err = nfs4_handle_exception(server, err, &exception);
7340                 }
7341         } while (exception.retry);
7342 out:
7343         return err;
7344 }
7345
7346 static int
7347 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7348                     struct nfs_fsinfo *info)
7349 {
7350         int err;
7351         struct page *page;
7352         rpc_authflavor_t flavor;
7353         struct nfs4_secinfo_flavors *flavors;
7354
7355         page = alloc_page(GFP_KERNEL);
7356         if (!page) {
7357                 err = -ENOMEM;
7358                 goto out;
7359         }
7360
7361         flavors = page_address(page);
7362         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7363
7364         /*
7365          * Fall back on "guess and check" method if
7366          * the server doesn't support SECINFO_NO_NAME
7367          */
7368         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7369                 err = nfs4_find_root_sec(server, fhandle, info);
7370                 goto out_freepage;
7371         }
7372         if (err)
7373                 goto out_freepage;
7374
7375         flavor = nfs_find_best_sec(flavors);
7376         if (err == 0)
7377                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
7378
7379 out_freepage:
7380         put_page(page);
7381         if (err == -EACCES)
7382                 return -EPERM;
7383 out:
7384         return err;
7385 }
7386
7387 static int _nfs41_test_stateid(struct nfs_server *server,
7388                 nfs4_stateid *stateid,
7389                 struct rpc_cred *cred)
7390 {
7391         int status;
7392         struct nfs41_test_stateid_args args = {
7393                 .stateid = stateid,
7394         };
7395         struct nfs41_test_stateid_res res;
7396         struct rpc_message msg = {
7397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7398                 .rpc_argp = &args,
7399                 .rpc_resp = &res,
7400                 .rpc_cred = cred,
7401         };
7402
7403         dprintk("NFS call  test_stateid %p\n", stateid);
7404         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
7405         nfs4_set_sequence_privileged(&args.seq_args);
7406         status = nfs4_call_sync_sequence(server->client, server, &msg,
7407                         &args.seq_args, &res.seq_res);
7408         if (status != NFS_OK) {
7409                 dprintk("NFS reply test_stateid: failed, %d\n", status);
7410                 return status;
7411         }
7412         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7413         return -res.status;
7414 }
7415
7416 /**
7417  * nfs41_test_stateid - perform a TEST_STATEID operation
7418  *
7419  * @server: server / transport on which to perform the operation
7420  * @stateid: state ID to test
7421  * @cred: credential
7422  *
7423  * Returns NFS_OK if the server recognizes that "stateid" is valid.
7424  * Otherwise a negative NFS4ERR value is returned if the operation
7425  * failed or the state ID is not currently valid.
7426  */
7427 static int nfs41_test_stateid(struct nfs_server *server,
7428                 nfs4_stateid *stateid,
7429                 struct rpc_cred *cred)
7430 {
7431         struct nfs4_exception exception = { };
7432         int err;
7433         do {
7434                 err = _nfs41_test_stateid(server, stateid, cred);
7435                 if (err != -NFS4ERR_DELAY)
7436                         break;
7437                 nfs4_handle_exception(server, err, &exception);
7438         } while (exception.retry);
7439         return err;
7440 }
7441
7442 struct nfs_free_stateid_data {
7443         struct nfs_server *server;
7444         struct nfs41_free_stateid_args args;
7445         struct nfs41_free_stateid_res res;
7446 };
7447
7448 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
7449 {
7450         struct nfs_free_stateid_data *data = calldata;
7451         nfs41_setup_sequence(nfs4_get_session(data->server),
7452                         &data->args.seq_args,
7453                         &data->res.seq_res,
7454                         task);
7455 }
7456
7457 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
7458 {
7459         struct nfs_free_stateid_data *data = calldata;
7460
7461         nfs41_sequence_done(task, &data->res.seq_res);
7462
7463         switch (task->tk_status) {
7464         case -NFS4ERR_DELAY:
7465                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
7466                         rpc_restart_call_prepare(task);
7467         }
7468 }
7469
7470 static void nfs41_free_stateid_release(void *calldata)
7471 {
7472         kfree(calldata);
7473 }
7474
7475 static const struct rpc_call_ops nfs41_free_stateid_ops = {
7476         .rpc_call_prepare = nfs41_free_stateid_prepare,
7477         .rpc_call_done = nfs41_free_stateid_done,
7478         .rpc_release = nfs41_free_stateid_release,
7479 };
7480
7481 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
7482                 nfs4_stateid *stateid,
7483                 struct rpc_cred *cred,
7484                 bool privileged)
7485 {
7486         struct rpc_message msg = {
7487                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7488                 .rpc_cred = cred,
7489         };
7490         struct rpc_task_setup task_setup = {
7491                 .rpc_client = server->client,
7492                 .rpc_message = &msg,
7493                 .callback_ops = &nfs41_free_stateid_ops,
7494                 .flags = RPC_TASK_ASYNC,
7495         };
7496         struct nfs_free_stateid_data *data;
7497
7498         dprintk("NFS call  free_stateid %p\n", stateid);
7499         data = kmalloc(sizeof(*data), GFP_NOFS);
7500         if (!data)
7501                 return ERR_PTR(-ENOMEM);
7502         data->server = server;
7503         nfs4_stateid_copy(&data->args.stateid, stateid);
7504
7505         task_setup.callback_data = data;
7506
7507         msg.rpc_argp = &data->args;
7508         msg.rpc_resp = &data->res;
7509         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
7510         if (privileged)
7511                 nfs4_set_sequence_privileged(&data->args.seq_args);
7512
7513         return rpc_run_task(&task_setup);
7514 }
7515
7516 /**
7517  * nfs41_free_stateid - perform a FREE_STATEID operation
7518  *
7519  * @server: server / transport on which to perform the operation
7520  * @stateid: state ID to release
7521  * @cred: credential
7522  *
7523  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7524  * negative NFS4ERR value is returned.
7525  */
7526 static int nfs41_free_stateid(struct nfs_server *server,
7527                 nfs4_stateid *stateid,
7528                 struct rpc_cred *cred)
7529 {
7530         struct rpc_task *task;
7531         int ret;
7532
7533         task = _nfs41_free_stateid(server, stateid, cred, true);
7534         if (IS_ERR(task))
7535                 return PTR_ERR(task);
7536         ret = rpc_wait_for_completion_task(task);
7537         if (!ret)
7538                 ret = task->tk_status;
7539         rpc_put_task(task);
7540         return ret;
7541 }
7542
7543 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
7544 {
7545         struct rpc_task *task;
7546         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
7547
7548         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
7549         nfs4_free_lock_state(server, lsp);
7550         if (IS_ERR(task))
7551                 return PTR_ERR(task);
7552         rpc_put_task(task);
7553         return 0;
7554 }
7555
7556 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7557                 const nfs4_stateid *s2)
7558 {
7559         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7560                 return false;
7561
7562         if (s1->seqid == s2->seqid)
7563                 return true;
7564         if (s1->seqid == 0 || s2->seqid == 0)
7565                 return true;
7566
7567         return false;
7568 }
7569
7570 #endif /* CONFIG_NFS_V4_1 */
7571
7572 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7573                 const nfs4_stateid *s2)
7574 {
7575         return nfs4_stateid_match(s1, s2);
7576 }
7577
7578
7579 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7580         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7581         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7582         .recover_open   = nfs4_open_reclaim,
7583         .recover_lock   = nfs4_lock_reclaim,
7584         .establish_clid = nfs4_init_clientid,
7585         .detect_trunking = nfs40_discover_server_trunking,
7586 };
7587
7588 #if defined(CONFIG_NFS_V4_1)
7589 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7590         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7591         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7592         .recover_open   = nfs4_open_reclaim,
7593         .recover_lock   = nfs4_lock_reclaim,
7594         .establish_clid = nfs41_init_clientid,
7595         .reclaim_complete = nfs41_proc_reclaim_complete,
7596         .detect_trunking = nfs41_discover_server_trunking,
7597 };
7598 #endif /* CONFIG_NFS_V4_1 */
7599
7600 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7601         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7602         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7603         .recover_open   = nfs4_open_expired,
7604         .recover_lock   = nfs4_lock_expired,
7605         .establish_clid = nfs4_init_clientid,
7606 };
7607
7608 #if defined(CONFIG_NFS_V4_1)
7609 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7610         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7611         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7612         .recover_open   = nfs41_open_expired,
7613         .recover_lock   = nfs41_lock_expired,
7614         .establish_clid = nfs41_init_clientid,
7615 };
7616 #endif /* CONFIG_NFS_V4_1 */
7617
7618 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7619         .sched_state_renewal = nfs4_proc_async_renew,
7620         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7621         .renew_lease = nfs4_proc_renew,
7622 };
7623
7624 #if defined(CONFIG_NFS_V4_1)
7625 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7626         .sched_state_renewal = nfs41_proc_async_sequence,
7627         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7628         .renew_lease = nfs4_proc_sequence,
7629 };
7630 #endif
7631
7632 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7633         .minor_version = 0,
7634         .init_caps = NFS_CAP_READDIRPLUS
7635                 | NFS_CAP_ATOMIC_OPEN
7636                 | NFS_CAP_CHANGE_ATTR
7637                 | NFS_CAP_POSIX_LOCK,
7638         .init_client = nfs40_init_client,
7639         .shutdown_client = nfs40_shutdown_client,
7640         .match_stateid = nfs4_match_stateid,
7641         .find_root_sec = nfs4_find_root_sec,
7642         .free_lock_state = nfs4_release_lockowner,
7643         .call_sync_ops = &nfs40_call_sync_ops,
7644         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7645         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7646         .state_renewal_ops = &nfs40_state_renewal_ops,
7647 };
7648
7649 #if defined(CONFIG_NFS_V4_1)
7650 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7651         .minor_version = 1,
7652         .init_caps = NFS_CAP_READDIRPLUS
7653                 | NFS_CAP_ATOMIC_OPEN
7654                 | NFS_CAP_CHANGE_ATTR
7655                 | NFS_CAP_POSIX_LOCK
7656                 | NFS_CAP_STATEID_NFSV41
7657                 | NFS_CAP_ATOMIC_OPEN_V1,
7658         .init_client = nfs41_init_client,
7659         .shutdown_client = nfs41_shutdown_client,
7660         .match_stateid = nfs41_match_stateid,
7661         .find_root_sec = nfs41_find_root_sec,
7662         .free_lock_state = nfs41_free_lock_state,
7663         .call_sync_ops = &nfs41_call_sync_ops,
7664         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7665         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7666         .state_renewal_ops = &nfs41_state_renewal_ops,
7667 };
7668 #endif
7669
7670 #if defined(CONFIG_NFS_V4_2)
7671 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
7672         .minor_version = 2,
7673         .init_caps = NFS_CAP_READDIRPLUS
7674                 | NFS_CAP_ATOMIC_OPEN
7675                 | NFS_CAP_CHANGE_ATTR
7676                 | NFS_CAP_POSIX_LOCK
7677                 | NFS_CAP_STATEID_NFSV41
7678                 | NFS_CAP_ATOMIC_OPEN_V1,
7679         .init_client = nfs41_init_client,
7680         .shutdown_client = nfs41_shutdown_client,
7681         .match_stateid = nfs41_match_stateid,
7682         .find_root_sec = nfs41_find_root_sec,
7683         .free_lock_state = nfs41_free_lock_state,
7684         .call_sync_ops = &nfs41_call_sync_ops,
7685         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7686         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7687         .state_renewal_ops = &nfs41_state_renewal_ops,
7688 };
7689 #endif
7690
7691 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7692         [0] = &nfs_v4_0_minor_ops,
7693 #if defined(CONFIG_NFS_V4_1)
7694         [1] = &nfs_v4_1_minor_ops,
7695 #endif
7696 #if defined(CONFIG_NFS_V4_2)
7697         [2] = &nfs_v4_2_minor_ops,
7698 #endif
7699 };
7700
7701 static const struct inode_operations nfs4_dir_inode_operations = {
7702         .create         = nfs_create,
7703         .lookup         = nfs_lookup,
7704         .atomic_open    = nfs_atomic_open,
7705         .link           = nfs_link,
7706         .unlink         = nfs_unlink,
7707         .symlink        = nfs_symlink,
7708         .mkdir          = nfs_mkdir,
7709         .rmdir          = nfs_rmdir,
7710         .mknod          = nfs_mknod,
7711         .rename         = nfs_rename,
7712         .permission     = nfs_permission,
7713         .getattr        = nfs_getattr,
7714         .setattr        = nfs_setattr,
7715         .getxattr       = generic_getxattr,
7716         .setxattr       = generic_setxattr,
7717         .listxattr      = generic_listxattr,
7718         .removexattr    = generic_removexattr,
7719 };
7720
7721 static const struct inode_operations nfs4_file_inode_operations = {
7722         .permission     = nfs_permission,
7723         .getattr        = nfs_getattr,
7724         .setattr        = nfs_setattr,
7725         .getxattr       = generic_getxattr,
7726         .setxattr       = generic_setxattr,
7727         .listxattr      = generic_listxattr,
7728         .removexattr    = generic_removexattr,
7729 };
7730
7731 const struct nfs_rpc_ops nfs_v4_clientops = {
7732         .version        = 4,                    /* protocol version */
7733         .dentry_ops     = &nfs4_dentry_operations,
7734         .dir_inode_ops  = &nfs4_dir_inode_operations,
7735         .file_inode_ops = &nfs4_file_inode_operations,
7736         .file_ops       = &nfs4_file_operations,
7737         .getroot        = nfs4_proc_get_root,
7738         .submount       = nfs4_submount,
7739         .try_mount      = nfs4_try_mount,
7740         .getattr        = nfs4_proc_getattr,
7741         .setattr        = nfs4_proc_setattr,
7742         .lookup         = nfs4_proc_lookup,
7743         .access         = nfs4_proc_access,
7744         .readlink       = nfs4_proc_readlink,
7745         .create         = nfs4_proc_create,
7746         .remove         = nfs4_proc_remove,
7747         .unlink_setup   = nfs4_proc_unlink_setup,
7748         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7749         .unlink_done    = nfs4_proc_unlink_done,
7750         .rename         = nfs4_proc_rename,
7751         .rename_setup   = nfs4_proc_rename_setup,
7752         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7753         .rename_done    = nfs4_proc_rename_done,
7754         .link           = nfs4_proc_link,
7755         .symlink        = nfs4_proc_symlink,
7756         .mkdir          = nfs4_proc_mkdir,
7757         .rmdir          = nfs4_proc_remove,
7758         .readdir        = nfs4_proc_readdir,
7759         .mknod          = nfs4_proc_mknod,
7760         .statfs         = nfs4_proc_statfs,
7761         .fsinfo         = nfs4_proc_fsinfo,
7762         .pathconf       = nfs4_proc_pathconf,
7763         .set_capabilities = nfs4_server_capabilities,
7764         .decode_dirent  = nfs4_decode_dirent,
7765         .read_setup     = nfs4_proc_read_setup,
7766         .read_pageio_init = pnfs_pageio_init_read,
7767         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7768         .read_done      = nfs4_read_done,
7769         .write_setup    = nfs4_proc_write_setup,
7770         .write_pageio_init = pnfs_pageio_init_write,
7771         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7772         .write_done     = nfs4_write_done,
7773         .commit_setup   = nfs4_proc_commit_setup,
7774         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7775         .commit_done    = nfs4_commit_done,
7776         .lock           = nfs4_proc_lock,
7777         .clear_acl_cache = nfs4_zap_acl_attr,
7778         .close_context  = nfs4_close_context,
7779         .open_context   = nfs4_atomic_open,
7780         .have_delegation = nfs4_have_delegation,
7781         .return_delegation = nfs4_inode_return_delegation,
7782         .alloc_client   = nfs4_alloc_client,
7783         .init_client    = nfs4_init_client,
7784         .free_client    = nfs4_free_client,
7785         .create_server  = nfs4_create_server,
7786         .clone_server   = nfs_clone_server,
7787 };
7788
7789 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7790         .prefix = XATTR_NAME_NFSV4_ACL,
7791         .list   = nfs4_xattr_list_nfs4_acl,
7792         .get    = nfs4_xattr_get_nfs4_acl,
7793         .set    = nfs4_xattr_set_nfs4_acl,
7794 };
7795
7796 const struct xattr_handler *nfs4_xattr_handlers[] = {
7797         &nfs4_xattr_nfs4_acl_handler,
7798 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7799         &nfs4_xattr_nfs4_label_handler,
7800 #endif
7801         NULL
7802 };
7803
7804 /*
7805  * Local variables:
7806  *  c-basic-offset: 8
7807  * End:
7808  */