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 *, long *);
  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         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_ACCESS:
 162                 return -EACCES;
 163         case -NFS4ERR_FILE_OPEN:
 164                 return -EBUSY;
 165         default:
 166                 dprintk("%s could not handle NFSv4 error %d\n",
 167                                 __func__, -err);
 168                 break;
 169         }
 170         return -EIO;
 171 }
 172
 173 /*
 174  * This is our standard bitmap for GETATTR requests.
 175  */
 176 const u32 nfs4_fattr_bitmap[3] = {
 177         FATTR4_WORD0_TYPE
 178         | FATTR4_WORD0_CHANGE
 179         | FATTR4_WORD0_SIZE
 180         | FATTR4_WORD0_FSID
 181         | FATTR4_WORD0_FILEID,
 182         FATTR4_WORD1_MODE
 183         | FATTR4_WORD1_NUMLINKS
 184         | FATTR4_WORD1_OWNER
 185         | FATTR4_WORD1_OWNER_GROUP
 186         | FATTR4_WORD1_RAWDEV
 187         | FATTR4_WORD1_SPACE_USED
 188         | FATTR4_WORD1_TIME_ACCESS
 189         | FATTR4_WORD1_TIME_METADATA
 190         | FATTR4_WORD1_TIME_MODIFY,
 191 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 192         FATTR4_WORD2_SECURITY_LABEL
 193 #endif
 194 };
 195
 196 static const u32 nfs4_pnfs_open_bitmap[3] = {
 197         FATTR4_WORD0_TYPE
 198         | FATTR4_WORD0_CHANGE
 199         | FATTR4_WORD0_SIZE
 200         | FATTR4_WORD0_FSID
 201         | FATTR4_WORD0_FILEID,
 202         FATTR4_WORD1_MODE
 203         | FATTR4_WORD1_NUMLINKS
 204         | FATTR4_WORD1_OWNER
 205         | FATTR4_WORD1_OWNER_GROUP
 206         | FATTR4_WORD1_RAWDEV
 207         | FATTR4_WORD1_SPACE_USED
 208         | FATTR4_WORD1_TIME_ACCESS
 209         | FATTR4_WORD1_TIME_METADATA
 210         | FATTR4_WORD1_TIME_MODIFY,
 211         FATTR4_WORD2_MDSTHRESHOLD
 212 };
 213
 214 static const u32 nfs4_open_noattr_bitmap[3] = {
 215         FATTR4_WORD0_TYPE
 216         | FATTR4_WORD0_CHANGE
 217         | FATTR4_WORD0_FILEID,
 218 };
 219
 220 const u32 nfs4_statfs_bitmap[3] = {
 221         FATTR4_WORD0_FILES_AVAIL
 222         | FATTR4_WORD0_FILES_FREE
 223         | FATTR4_WORD0_FILES_TOTAL,
 224         FATTR4_WORD1_SPACE_AVAIL
 225         | FATTR4_WORD1_SPACE_FREE
 226         | FATTR4_WORD1_SPACE_TOTAL
 227 };
 228
 229 const u32 nfs4_pathconf_bitmap[3] = {
 230         FATTR4_WORD0_MAXLINK
 231         | FATTR4_WORD0_MAXNAME,
 232         0
 233 };
 234
 235 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 236                         | FATTR4_WORD0_MAXREAD
 237                         | FATTR4_WORD0_MAXWRITE
 238                         | FATTR4_WORD0_LEASE_TIME,
 239                         FATTR4_WORD1_TIME_DELTA
 240                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 241                         FATTR4_WORD2_LAYOUT_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static long nfs4_update_delay(long *timeout)
 318 {
 319         long ret;
 320         if (!timeout)
 321                 return NFS4_POLL_RETRY_MAX;
 322         if (*timeout <= 0)
 323                 *timeout = NFS4_POLL_RETRY_MIN;
 324         if (*timeout > NFS4_POLL_RETRY_MAX)
 325                 *timeout = NFS4_POLL_RETRY_MAX;
 326         ret = *timeout;
 327         *timeout <<= 1;
 328         return ret;
 329 }
 330
 331 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 332 {
 333         int res = 0;
 334
 335         might_sleep();
 336
 337         freezable_schedule_timeout_killable_unsafe(
 338                 nfs4_update_delay(timeout));
 339         if (fatal_signal_pending(current))
 340                 res = -ERESTARTSYS;
 341         return res;
 342 }
 343
 344 /* This is the error handling routine for processes that are allowed
 345  * to sleep.
 346  */
 347 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 348 {
 349         struct nfs_client *clp = server->nfs_client;
 350         struct nfs4_state *state = exception->state;
 351         struct inode *inode = exception->inode;
 352         int ret = errorcode;
 353
 354         exception->retry = 0;
 355         switch(errorcode) {
 356                 case 0:
 357                         return 0;
 358                 case -NFS4ERR_OPENMODE:
 359                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 360                                 nfs4_inode_return_delegation(inode);
 361                                 exception->retry = 1;
 362                                 return 0;
 363                         }
 364                         if (state == NULL)
 365                                 break;
 366                         ret = nfs4_schedule_stateid_recovery(server, state);
 367                         if (ret < 0)
 368                                 break;
 369                         goto wait_on_recovery;
 370                 case -NFS4ERR_DELEG_REVOKED:
 371                 case -NFS4ERR_ADMIN_REVOKED:
 372                 case -NFS4ERR_BAD_STATEID:
 373                         if (state == NULL)
 374                                 break;
 375                         ret = nfs4_schedule_stateid_recovery(server, state);
 376                         if (ret < 0)
 377                                 break;
 378                         goto wait_on_recovery;
 379                 case -NFS4ERR_EXPIRED:
 380                         if (state != NULL) {
 381                                 ret = nfs4_schedule_stateid_recovery(server, state);
 382                                 if (ret < 0)
 383                                         break;
 384                         }
 385                 case -NFS4ERR_STALE_STATEID:
 386                 case -NFS4ERR_STALE_CLIENTID:
 387                         nfs4_schedule_lease_recovery(clp);
 388                         goto wait_on_recovery;
 389                 case -NFS4ERR_MOVED:
 390                         ret = nfs4_schedule_migration_recovery(server);
 391                         if (ret < 0)
 392                                 break;
 393                         goto wait_on_recovery;
 394                 case -NFS4ERR_LEASE_MOVED:
 395                         nfs4_schedule_lease_moved_recovery(clp);
 396                         goto wait_on_recovery;
 397 #if defined(CONFIG_NFS_V4_1)
 398                 case -NFS4ERR_BADSESSION:
 399                 case -NFS4ERR_BADSLOT:
 400                 case -NFS4ERR_BAD_HIGH_SLOT:
 401                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 402                 case -NFS4ERR_DEADSESSION:
 403                 case -NFS4ERR_SEQ_FALSE_RETRY:
 404                 case -NFS4ERR_SEQ_MISORDERED:
 405                         dprintk("%s ERROR: %d Reset session\n", __func__,
 406                                 errorcode);
 407                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 408                         goto wait_on_recovery;
 409 #endif /* defined(CONFIG_NFS_V4_1) */
 410                 case -NFS4ERR_FILE_OPEN:
 411                         if (exception->timeout > HZ) {
 412                                 /* We have retried a decent amount, time to
 413                                  * fail
 414                                  */
 415                                 ret = -EBUSY;
 416                                 break;
 417                         }
 418                 case -NFS4ERR_GRACE:
 419                 case -NFS4ERR_DELAY:
 420                         ret = nfs4_delay(server->client, &exception->timeout);
 421                         if (ret != 0)
 422                                 break;
 423                 case -NFS4ERR_RETRY_UNCACHED_REP:
 424                 case -NFS4ERR_OLD_STATEID:
 425                         exception->retry = 1;
 426                         break;
 427                 case -NFS4ERR_BADOWNER:
 428                         /* The following works around a Linux server bug! */
 429                 case -NFS4ERR_BADNAME:
 430                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 431                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 432                                 exception->retry = 1;
 433                                 printk(KERN_WARNING "NFS: v4 server %s "
 434                                                 "does not accept raw "
 435                                                 "uid/gids. "
 436                                                 "Reenabling the idmapper.\n",
 437                                                 server->nfs_client->cl_hostname);
 438                         }
 439         }
 440         /* We failed to handle the error */
 441         return nfs4_map_errors(ret);
 442 wait_on_recovery:
 443         ret = nfs4_wait_clnt_recover(clp);
 444         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 445                 return -EIO;
 446         if (ret == 0)
 447                 exception->retry = 1;
 448         return ret;
 449 }
 450
 451 /*
 452  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 453  * or 'false' otherwise.
 454  */
 455 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 456 {
 457         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 458
 459         if (flavor == RPC_AUTH_GSS_KRB5I ||
 460             flavor == RPC_AUTH_GSS_KRB5P)
 461                 return true;
 462
 463         return false;
 464 }
 465
 466 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 467 {
 468         spin_lock(&clp->cl_lock);
 469         if (time_before(clp->cl_last_renewal,timestamp))
 470                 clp->cl_last_renewal = timestamp;
 471         spin_unlock(&clp->cl_lock);
 472 }
 473
 474 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 475 {
 476         do_renew_lease(server->nfs_client, timestamp);
 477 }
 478
 479 struct nfs4_call_sync_data {
 480         const struct nfs_server *seq_server;
 481         struct nfs4_sequence_args *seq_args;
 482         struct nfs4_sequence_res *seq_res;
 483 };
 484
 485 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 486                                struct nfs4_sequence_res *res, int cache_reply)
 487 {
 488         args->sa_slot = NULL;
 489         args->sa_cache_this = cache_reply;
 490         args->sa_privileged = 0;
 491
 492         res->sr_slot = NULL;
 493 }
 494
 495 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 496 {
 497         args->sa_privileged = 1;
 498 }
 499
 500 static int nfs40_setup_sequence(const struct nfs_server *server,
 501                                 struct nfs4_sequence_args *args,
 502                                 struct nfs4_sequence_res *res,
 503                                 struct rpc_task *task)
 504 {
 505         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 506         struct nfs4_slot *slot;
 507
 508         /* slot already allocated? */
 509         if (res->sr_slot != NULL)
 510                 goto out_start;
 511
 512         spin_lock(&tbl->slot_tbl_lock);
 513         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 514                 goto out_sleep;
 515
 516         slot = nfs4_alloc_slot(tbl);
 517         if (IS_ERR(slot)) {
 518                 if (slot == ERR_PTR(-ENOMEM))
 519                         task->tk_timeout = HZ >> 2;
 520                 goto out_sleep;
 521         }
 522         spin_unlock(&tbl->slot_tbl_lock);
 523
 524         args->sa_slot = slot;
 525         res->sr_slot = slot;
 526
 527 out_start:
 528         rpc_call_start(task);
 529         return 0;
 530
 531 out_sleep:
 532         if (args->sa_privileged)
 533                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 534                                 NULL, RPC_PRIORITY_PRIVILEGED);
 535         else
 536                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 537         spin_unlock(&tbl->slot_tbl_lock);
 538         return -EAGAIN;
 539 }
 540
 541 static int nfs40_sequence_done(struct rpc_task *task,
 542                                struct nfs4_sequence_res *res)
 543 {
 544         struct nfs4_slot *slot = res->sr_slot;
 545         struct nfs4_slot_table *tbl;
 546
 547         if (slot == NULL)
 548                 goto out;
 549
 550         tbl = slot->table;
 551         spin_lock(&tbl->slot_tbl_lock);
 552         if (!nfs41_wake_and_assign_slot(tbl, slot))
 553                 nfs4_free_slot(tbl, slot);
 554         spin_unlock(&tbl->slot_tbl_lock);
 555
 556         res->sr_slot = NULL;
 557 out:
 558         return 1;
 559 }
 560
 561 #if defined(CONFIG_NFS_V4_1)
 562
 563 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 564 {
 565         struct nfs4_session *session;
 566         struct nfs4_slot_table *tbl;
 567         struct nfs4_slot *slot = res->sr_slot;
 568         bool send_new_highest_used_slotid = false;
 569
 570         tbl = slot->table;
 571         session = tbl->session;
 572
 573         spin_lock(&tbl->slot_tbl_lock);
 574         /* Be nice to the server: try to ensure that the last transmitted
 575          * value for highest_user_slotid <= target_highest_slotid
 576          */
 577         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 578                 send_new_highest_used_slotid = true;
 579
 580         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 581                 send_new_highest_used_slotid = false;
 582                 goto out_unlock;
 583         }
 584         nfs4_free_slot(tbl, slot);
 585
 586         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 587                 send_new_highest_used_slotid = false;
 588 out_unlock:
 589         spin_unlock(&tbl->slot_tbl_lock);
 590         res->sr_slot = NULL;
 591         if (send_new_highest_used_slotid)
 592                 nfs41_server_notify_highest_slotid_update(session->clp);
 593 }
 594
 595 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 596 {
 597         struct nfs4_session *session;
 598         struct nfs4_slot *slot = res->sr_slot;
 599         struct nfs_client *clp;
 600         bool interrupted = false;
 601         int ret = 1;
 602
 603         if (slot == NULL)
 604                 goto out_noaction;
 605         /* don't increment the sequence number if the task wasn't sent */
 606         if (!RPC_WAS_SENT(task))
 607                 goto out;
 608
 609         session = slot->table->session;
 610
 611         if (slot->interrupted) {
 612                 slot->interrupted = 0;
 613                 interrupted = true;
 614         }
 615
 616         trace_nfs4_sequence_done(session, res);
 617         /* Check the SEQUENCE operation status */
 618         switch (res->sr_status) {
 619         case 0:
 620                 /* Update the slot's sequence and clientid lease timer */
 621                 ++slot->seq_nr;
 622                 clp = session->clp;
 623                 do_renew_lease(clp, res->sr_timestamp);
 624                 /* Check sequence flags */
 625                 if (res->sr_status_flags != 0)
 626                         nfs4_schedule_lease_recovery(clp);
 627                 nfs41_update_target_slotid(slot->table, slot, res);
 628                 break;
 629         case 1:
 630                 /*
 631                  * sr_status remains 1 if an RPC level error occurred.
 632                  * The server may or may not have processed the sequence
 633                  * operation..
 634                  * Mark the slot as having hosted an interrupted RPC call.
 635                  */
 636                 slot->interrupted = 1;
 637                 goto out;
 638         case -NFS4ERR_DELAY:
 639                 /* The server detected a resend of the RPC call and
 640                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 641                  * of RFC5661.
 642                  */
 643                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 644                         __func__,
 645                         slot->slot_nr,
 646                         slot->seq_nr);
 647                 goto out_retry;
 648         case -NFS4ERR_BADSLOT:
 649                 /*
 650                  * The slot id we used was probably retired. Try again
 651                  * using a different slot id.
 652                  */
 653                 goto retry_nowait;
 654         case -NFS4ERR_SEQ_MISORDERED:
 655                 /*
 656                  * Was the last operation on this sequence interrupted?
 657                  * If so, retry after bumping the sequence number.
 658                  */
 659                 if (interrupted) {
 660                         ++slot->seq_nr;
 661                         goto retry_nowait;
 662                 }
 663                 /*
 664                  * Could this slot have been previously retired?
 665                  * If so, then the server may be expecting seq_nr = 1!
 666                  */
 667                 if (slot->seq_nr != 1) {
 668                         slot->seq_nr = 1;
 669                         goto retry_nowait;
 670                 }
 671                 break;
 672         case -NFS4ERR_SEQ_FALSE_RETRY:
 673                 ++slot->seq_nr;
 674                 goto retry_nowait;
 675         default:
 676                 /* Just update the slot sequence no. */
 677                 ++slot->seq_nr;
 678         }
 679 out:
 680         /* The session may be reset by one of the error handlers. */
 681         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 682         nfs41_sequence_free_slot(res);
 683 out_noaction:
 684         return ret;
 685 retry_nowait:
 686         if (rpc_restart_call_prepare(task)) {
 687                 task->tk_status = 0;
 688                 ret = 0;
 689         }
 690         goto out;
 691 out_retry:
 692         if (!rpc_restart_call(task))
 693                 goto out;
 694         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 695         return 0;
 696 }
 697 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 698
 699 static int nfs4_sequence_done(struct rpc_task *task,
 700                                struct nfs4_sequence_res *res)
 701 {
 702         if (res->sr_slot == NULL)
 703                 return 1;
 704         if (!res->sr_slot->table->session)
 705                 return nfs40_sequence_done(task, res);
 706         return nfs41_sequence_done(task, res);
 707 }
 708
 709 int nfs41_setup_sequence(struct nfs4_session *session,
 710                                 struct nfs4_sequence_args *args,
 711                                 struct nfs4_sequence_res *res,
 712                                 struct rpc_task *task)
 713 {
 714         struct nfs4_slot *slot;
 715         struct nfs4_slot_table *tbl;
 716
 717         dprintk("--> %s\n", __func__);
 718         /* slot already allocated? */
 719         if (res->sr_slot != NULL)
 720                 goto out_success;
 721
 722         tbl = &session->fc_slot_table;
 723
 724         task->tk_timeout = 0;
 725
 726         spin_lock(&tbl->slot_tbl_lock);
 727         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 728             !args->sa_privileged) {
 729                 /* The state manager will wait until the slot table is empty */
 730                 dprintk("%s session is draining\n", __func__);
 731                 goto out_sleep;
 732         }
 733
 734         slot = nfs4_alloc_slot(tbl);
 735         if (IS_ERR(slot)) {
 736                 /* If out of memory, try again in 1/4 second */
 737                 if (slot == ERR_PTR(-ENOMEM))
 738                         task->tk_timeout = HZ >> 2;
 739                 dprintk("<-- %s: no free slots\n", __func__);
 740                 goto out_sleep;
 741         }
 742         spin_unlock(&tbl->slot_tbl_lock);
 743
 744         args->sa_slot = slot;
 745
 746         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 747                         slot->slot_nr, slot->seq_nr);
 748
 749         res->sr_slot = slot;
 750         res->sr_timestamp = jiffies;
 751         res->sr_status_flags = 0;
 752         /*
 753          * sr_status is only set in decode_sequence, and so will remain
 754          * set to 1 if an rpc level failure occurs.
 755          */
 756         res->sr_status = 1;
 757         trace_nfs4_setup_sequence(session, args);
 758 out_success:
 759         rpc_call_start(task);
 760         return 0;
 761 out_sleep:
 762         /* Privileged tasks are queued with top priority */
 763         if (args->sa_privileged)
 764                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 765                                 NULL, RPC_PRIORITY_PRIVILEGED);
 766         else
 767                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 768         spin_unlock(&tbl->slot_tbl_lock);
 769         return -EAGAIN;
 770 }
 771 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 772
 773 static int nfs4_setup_sequence(const struct nfs_server *server,
 774                                struct nfs4_sequence_args *args,
 775                                struct nfs4_sequence_res *res,
 776                                struct rpc_task *task)
 777 {
 778         struct nfs4_session *session = nfs4_get_session(server);
 779         int ret = 0;
 780
 781         if (!session)
 782                 return nfs40_setup_sequence(server, args, res, task);
 783
 784         dprintk("--> %s clp %p session %p sr_slot %u\n",
 785                 __func__, session->clp, session, res->sr_slot ?
 786                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 787
 788         ret = nfs41_setup_sequence(session, args, res, task);
 789
 790         dprintk("<-- %s status=%d\n", __func__, ret);
 791         return ret;
 792 }
 793
 794 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 795 {
 796         struct nfs4_call_sync_data *data = calldata;
 797         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 798
 799         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 800
 801         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 802 }
 803
 804 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 805 {
 806         struct nfs4_call_sync_data *data = calldata;
 807
 808         nfs41_sequence_done(task, data->seq_res);
 809 }
 810
 811 static const struct rpc_call_ops nfs41_call_sync_ops = {
 812         .rpc_call_prepare = nfs41_call_sync_prepare,
 813         .rpc_call_done = nfs41_call_sync_done,
 814 };
 815
 816 #else   /* !CONFIG_NFS_V4_1 */
 817
 818 static int nfs4_setup_sequence(const struct nfs_server *server,
 819                                struct nfs4_sequence_args *args,
 820                                struct nfs4_sequence_res *res,
 821                                struct rpc_task *task)
 822 {
 823         return nfs40_setup_sequence(server, args, res, task);
 824 }
 825
 826 static int nfs4_sequence_done(struct rpc_task *task,
 827                                struct nfs4_sequence_res *res)
 828 {
 829         return nfs40_sequence_done(task, res);
 830 }
 831
 832 #endif  /* !CONFIG_NFS_V4_1 */
 833
 834 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 835 {
 836         struct nfs4_call_sync_data *data = calldata;
 837         nfs4_setup_sequence(data->seq_server,
 838                                 data->seq_args, data->seq_res, task);
 839 }
 840
 841 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 842 {
 843         struct nfs4_call_sync_data *data = calldata;
 844         nfs4_sequence_done(task, data->seq_res);
 845 }
 846
 847 static const struct rpc_call_ops nfs40_call_sync_ops = {
 848         .rpc_call_prepare = nfs40_call_sync_prepare,
 849         .rpc_call_done = nfs40_call_sync_done,
 850 };
 851
 852 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 853                                    struct nfs_server *server,
 854                                    struct rpc_message *msg,
 855                                    struct nfs4_sequence_args *args,
 856                                    struct nfs4_sequence_res *res)
 857 {
 858         int ret;
 859         struct rpc_task *task;
 860         struct nfs_client *clp = server->nfs_client;
 861         struct nfs4_call_sync_data data = {
 862                 .seq_server = server,
 863                 .seq_args = args,
 864                 .seq_res = res,
 865         };
 866         struct rpc_task_setup task_setup = {
 867                 .rpc_client = clnt,
 868                 .rpc_message = msg,
 869                 .callback_ops = clp->cl_mvops->call_sync_ops,
 870                 .callback_data = &data
 871         };
 872
 873         task = rpc_run_task(&task_setup);
 874         if (IS_ERR(task))
 875                 ret = PTR_ERR(task);
 876         else {
 877                 ret = task->tk_status;
 878                 rpc_put_task(task);
 879         }
 880         return ret;
 881 }
 882
 883 int nfs4_call_sync(struct rpc_clnt *clnt,
 884                    struct nfs_server *server,
 885                    struct rpc_message *msg,
 886                    struct nfs4_sequence_args *args,
 887                    struct nfs4_sequence_res *res,
 888                    int cache_reply)
 889 {
 890         nfs4_init_sequence(args, res, cache_reply);
 891         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 892 }
 893
 894 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 895 {
 896         struct nfs_inode *nfsi = NFS_I(dir);
 897
 898         spin_lock(&dir->i_lock);
 899         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 900         if (!cinfo->atomic || cinfo->before != dir->i_version)
 901                 nfs_force_lookup_revalidate(dir);
 902         dir->i_version = cinfo->after;
 903         nfs_fscache_invalidate(dir);
 904         spin_unlock(&dir->i_lock);
 905 }
 906
 907 struct nfs4_opendata {
 908         struct kref kref;
 909         struct nfs_openargs o_arg;
 910         struct nfs_openres o_res;
 911         struct nfs_open_confirmargs c_arg;
 912         struct nfs_open_confirmres c_res;
 913         struct nfs4_string owner_name;
 914         struct nfs4_string group_name;
 915         struct nfs_fattr f_attr;
 916         struct nfs4_label *f_label;
 917         struct dentry *dir;
 918         struct dentry *dentry;
 919         struct nfs4_state_owner *owner;
 920         struct nfs4_state *state;
 921         struct iattr attrs;
 922         unsigned long timestamp;
 923         unsigned int rpc_done : 1;
 924         unsigned int file_created : 1;
 925         unsigned int is_recover : 1;
 926         int rpc_status;
 927         int cancelled;
 928 };
 929
 930 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 931                 int err, struct nfs4_exception *exception)
 932 {
 933         if (err != -EINVAL)
 934                 return false;
 935         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 936                 return false;
 937         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 938         exception->retry = 1;
 939         return true;
 940 }
 941
 942 static enum open_claim_type4
 943 nfs4_map_atomic_open_claim(struct nfs_server *server,
 944                 enum open_claim_type4 claim)
 945 {
 946         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 947                 return claim;
 948         switch (claim) {
 949         default:
 950                 return claim;
 951         case NFS4_OPEN_CLAIM_FH:
 952                 return NFS4_OPEN_CLAIM_NULL;
 953         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 954                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 955         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 956                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 957         }
 958 }
 959
 960 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 961 {
 962         p->o_res.f_attr = &p->f_attr;
 963         p->o_res.f_label = p->f_label;
 964         p->o_res.seqid = p->o_arg.seqid;
 965         p->c_res.seqid = p->c_arg.seqid;
 966         p->o_res.server = p->o_arg.server;
 967         p->o_res.access_request = p->o_arg.access;
 968         nfs_fattr_init(&p->f_attr);
 969         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 970 }
 971
 972 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 973                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 974                 const struct iattr *attrs,
 975                 struct nfs4_label *label,
 976                 enum open_claim_type4 claim,
 977                 gfp_t gfp_mask)
 978 {
 979         struct dentry *parent = dget_parent(dentry);
 980         struct inode *dir = parent->d_inode;
 981         struct nfs_server *server = NFS_SERVER(dir);
 982         struct nfs4_opendata *p;
 983
 984         p = kzalloc(sizeof(*p), gfp_mask);
 985         if (p == NULL)
 986                 goto err;
 987
 988         p->f_label = nfs4_label_alloc(server, gfp_mask);
 989         if (IS_ERR(p->f_label))
 990                 goto err_free_p;
 991
 992         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 993         if (p->o_arg.seqid == NULL)
 994                 goto err_free_label;
 995         nfs_sb_active(dentry->d_sb);
 996         p->dentry = dget(dentry);
 997         p->dir = parent;
 998         p->owner = sp;
 999         atomic_inc(&sp->so_count);
1000         p->o_arg.open_flags = flags;
1001         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1002         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1003          * will return permission denied for all bits until close */
1004         if (!(flags & O_EXCL)) {
1005                 /* ask server to check for all possible rights as results
1006                  * are cached */
1007                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1008                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1009         }
1010         p->o_arg.clientid = server->nfs_client->cl_clientid;
1011         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1012         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1013         p->o_arg.name = &dentry->d_name;
1014         p->o_arg.server = server;
1015         p->o_arg.bitmask = nfs4_bitmask(server, label);
1016         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1017         p->o_arg.label = label;
1018         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1019         switch (p->o_arg.claim) {
1020         case NFS4_OPEN_CLAIM_NULL:
1021         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1022         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1023                 p->o_arg.fh = NFS_FH(dir);
1024                 break;
1025         case NFS4_OPEN_CLAIM_PREVIOUS:
1026         case NFS4_OPEN_CLAIM_FH:
1027         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1028         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1029                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1030         }
1031         if (attrs != NULL && attrs->ia_valid != 0) {
1032                 __u32 verf[2];
1033
1034                 p->o_arg.u.attrs = &p->attrs;
1035                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1036
1037                 verf[0] = jiffies;
1038                 verf[1] = current->pid;
1039                 memcpy(p->o_arg.u.verifier.data, verf,
1040                                 sizeof(p->o_arg.u.verifier.data));
1041         }
1042         p->c_arg.fh = &p->o_res.fh;
1043         p->c_arg.stateid = &p->o_res.stateid;
1044         p->c_arg.seqid = p->o_arg.seqid;
1045         nfs4_init_opendata_res(p);
1046         kref_init(&p->kref);
1047         return p;
1048
1049 err_free_label:
1050         nfs4_label_free(p->f_label);
1051 err_free_p:
1052         kfree(p);
1053 err:
1054         dput(parent);
1055         return NULL;
1056 }
1057
1058 static void nfs4_opendata_free(struct kref *kref)
1059 {
1060         struct nfs4_opendata *p = container_of(kref,
1061                         struct nfs4_opendata, kref);
1062         struct super_block *sb = p->dentry->d_sb;
1063
1064         nfs_free_seqid(p->o_arg.seqid);
1065         if (p->state != NULL)
1066                 nfs4_put_open_state(p->state);
1067         nfs4_put_state_owner(p->owner);
1068
1069         nfs4_label_free(p->f_label);
1070
1071         dput(p->dir);
1072         dput(p->dentry);
1073         nfs_sb_deactive(sb);
1074         nfs_fattr_free_names(&p->f_attr);
1075         kfree(p->f_attr.mdsthreshold);
1076         kfree(p);
1077 }
1078
1079 static void nfs4_opendata_put(struct nfs4_opendata *p)
1080 {
1081         if (p != NULL)
1082                 kref_put(&p->kref, nfs4_opendata_free);
1083 }
1084
1085 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1086 {
1087         int ret;
1088
1089         ret = rpc_wait_for_completion_task(task);
1090         return ret;
1091 }
1092
1093 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1094 {
1095         int ret = 0;
1096
1097         if (open_mode & (O_EXCL|O_TRUNC))
1098                 goto out;
1099         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1100                 case FMODE_READ:
1101                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1102                                 && state->n_rdonly != 0;
1103                         break;
1104                 case FMODE_WRITE:
1105                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1106                                 && state->n_wronly != 0;
1107                         break;
1108                 case FMODE_READ|FMODE_WRITE:
1109                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1110                                 && state->n_rdwr != 0;
1111         }
1112 out:
1113         return ret;
1114 }
1115
1116 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1117 {
1118         if (delegation == NULL)
1119                 return 0;
1120         if ((delegation->type & fmode) != fmode)
1121                 return 0;
1122         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1123                 return 0;
1124         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1125                 return 0;
1126         nfs_mark_delegation_referenced(delegation);
1127         return 1;
1128 }
1129
1130 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1131 {
1132         switch (fmode) {
1133                 case FMODE_WRITE:
1134                         state->n_wronly++;
1135                         break;
1136                 case FMODE_READ:
1137                         state->n_rdonly++;
1138                         break;
1139                 case FMODE_READ|FMODE_WRITE:
1140                         state->n_rdwr++;
1141         }
1142         nfs4_state_set_mode_locked(state, state->state | fmode);
1143 }
1144
1145 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1146 {
1147         struct nfs_client *clp = state->owner->so_server->nfs_client;
1148         bool need_recover = false;
1149
1150         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1151                 need_recover = true;
1152         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1153                 need_recover = true;
1154         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1155                 need_recover = true;
1156         if (need_recover)
1157                 nfs4_state_mark_reclaim_nograce(clp, state);
1158 }
1159
1160 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1161                 nfs4_stateid *stateid)
1162 {
1163         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1164                 return true;
1165         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1166                 nfs_test_and_clear_all_open_stateid(state);
1167                 return true;
1168         }
1169         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1170                 return true;
1171         return false;
1172 }
1173
1174 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1175                 nfs4_stateid *stateid, fmode_t fmode)
1176 {
1177         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1178         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1179         case FMODE_WRITE:
1180                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1181                 break;
1182         case FMODE_READ:
1183                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1184                 break;
1185         case 0:
1186                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1187                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1188                 clear_bit(NFS_OPEN_STATE, &state->flags);
1189         }
1190         if (stateid == NULL)
1191                 return;
1192         if (!nfs_need_update_open_stateid(state, stateid))
1193                 return;
1194         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1195                 nfs4_stateid_copy(&state->stateid, stateid);
1196         nfs4_stateid_copy(&state->open_stateid, stateid);
1197 }
1198
1199 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1200 {
1201         write_seqlock(&state->seqlock);
1202         nfs_clear_open_stateid_locked(state, stateid, fmode);
1203         write_sequnlock(&state->seqlock);
1204         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1205                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1206 }
1207
1208 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1209 {
1210         switch (fmode) {
1211                 case FMODE_READ:
1212                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1213                         break;
1214                 case FMODE_WRITE:
1215                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1216                         break;
1217                 case FMODE_READ|FMODE_WRITE:
1218                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1219         }
1220         if (!nfs_need_update_open_stateid(state, stateid))
1221                 return;
1222         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1223                 nfs4_stateid_copy(&state->stateid, stateid);
1224         nfs4_stateid_copy(&state->open_stateid, stateid);
1225 }
1226
1227 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1228 {
1229         /*
1230          * Protect the call to nfs4_state_set_mode_locked and
1231          * serialise the stateid update
1232          */
1233         write_seqlock(&state->seqlock);
1234         if (deleg_stateid != NULL) {
1235                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1236                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1237         }
1238         if (open_stateid != NULL)
1239                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1240         write_sequnlock(&state->seqlock);
1241         spin_lock(&state->owner->so_lock);
1242         update_open_stateflags(state, fmode);
1243         spin_unlock(&state->owner->so_lock);
1244 }
1245
1246 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1247 {
1248         struct nfs_inode *nfsi = NFS_I(state->inode);
1249         struct nfs_delegation *deleg_cur;
1250         int ret = 0;
1251
1252         fmode &= (FMODE_READ|FMODE_WRITE);
1253
1254         rcu_read_lock();
1255         deleg_cur = rcu_dereference(nfsi->delegation);
1256         if (deleg_cur == NULL)
1257                 goto no_delegation;
1258
1259         spin_lock(&deleg_cur->lock);
1260         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1261            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1262             (deleg_cur->type & fmode) != fmode)
1263                 goto no_delegation_unlock;
1264
1265         if (delegation == NULL)
1266                 delegation = &deleg_cur->stateid;
1267         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1268                 goto no_delegation_unlock;
1269
1270         nfs_mark_delegation_referenced(deleg_cur);
1271         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1272         ret = 1;
1273 no_delegation_unlock:
1274         spin_unlock(&deleg_cur->lock);
1275 no_delegation:
1276         rcu_read_unlock();
1277
1278         if (!ret && open_stateid != NULL) {
1279                 __update_open_stateid(state, open_stateid, NULL, fmode);
1280                 ret = 1;
1281         }
1282         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1283                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1284
1285         return ret;
1286 }
1287
1288
1289 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1290 {
1291         struct nfs_delegation *delegation;
1292
1293         rcu_read_lock();
1294         delegation = rcu_dereference(NFS_I(inode)->delegation);
1295         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1296                 rcu_read_unlock();
1297                 return;
1298         }
1299         rcu_read_unlock();
1300         nfs4_inode_return_delegation(inode);
1301 }
1302
1303 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1304 {
1305         struct nfs4_state *state = opendata->state;
1306         struct nfs_inode *nfsi = NFS_I(state->inode);
1307         struct nfs_delegation *delegation;
1308         int open_mode = opendata->o_arg.open_flags;
1309         fmode_t fmode = opendata->o_arg.fmode;
1310         nfs4_stateid stateid;
1311         int ret = -EAGAIN;
1312
1313         for (;;) {
1314                 spin_lock(&state->owner->so_lock);
1315                 if (can_open_cached(state, fmode, open_mode)) {
1316                         update_open_stateflags(state, fmode);
1317                         spin_unlock(&state->owner->so_lock);
1318                         goto out_return_state;
1319                 }
1320                 spin_unlock(&state->owner->so_lock);
1321                 rcu_read_lock();
1322                 delegation = rcu_dereference(nfsi->delegation);
1323                 if (!can_open_delegated(delegation, fmode)) {
1324                         rcu_read_unlock();
1325                         break;
1326                 }
1327                 /* Save the delegation */
1328                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1329                 rcu_read_unlock();
1330                 nfs_release_seqid(opendata->o_arg.seqid);
1331                 if (!opendata->is_recover) {
1332                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1333                         if (ret != 0)
1334                                 goto out;
1335                 }
1336                 ret = -EAGAIN;
1337
1338                 /* Try to update the stateid using the delegation */
1339                 if (update_open_stateid(state, NULL, &stateid, fmode))
1340                         goto out_return_state;
1341         }
1342 out:
1343         return ERR_PTR(ret);
1344 out_return_state:
1345         atomic_inc(&state->count);
1346         return state;
1347 }
1348
1349 static void
1350 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1351 {
1352         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1353         struct nfs_delegation *delegation;
1354         int delegation_flags = 0;
1355
1356         rcu_read_lock();
1357         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1358         if (delegation)
1359                 delegation_flags = delegation->flags;
1360         rcu_read_unlock();
1361         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1362                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1363                                    "returning a delegation for "
1364                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1365                                    clp->cl_hostname);
1366         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1367                 nfs_inode_set_delegation(state->inode,
1368                                          data->owner->so_cred,
1369                                          &data->o_res);
1370         else
1371                 nfs_inode_reclaim_delegation(state->inode,
1372                                              data->owner->so_cred,
1373                                              &data->o_res);
1374 }
1375
1376 /*
1377  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1378  * and update the nfs4_state.
1379  */
1380 static struct nfs4_state *
1381 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1382 {
1383         struct inode *inode = data->state->inode;
1384         struct nfs4_state *state = data->state;
1385         int ret;
1386
1387         if (!data->rpc_done) {
1388                 if (data->rpc_status) {
1389                         ret = data->rpc_status;
1390                         goto err;
1391                 }
1392                 /* cached opens have already been processed */
1393                 goto update;
1394         }
1395
1396         ret = nfs_refresh_inode(inode, &data->f_attr);
1397         if (ret)
1398                 goto err;
1399
1400         if (data->o_res.delegation_type != 0)
1401                 nfs4_opendata_check_deleg(data, state);
1402 update:
1403         update_open_stateid(state, &data->o_res.stateid, NULL,
1404                             data->o_arg.fmode);
1405         atomic_inc(&state->count);
1406
1407         return state;
1408 err:
1409         return ERR_PTR(ret);
1410
1411 }
1412
1413 static struct nfs4_state *
1414 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1415 {
1416         struct inode *inode;
1417         struct nfs4_state *state = NULL;
1418         int ret;
1419
1420         if (!data->rpc_done) {
1421                 state = nfs4_try_open_cached(data);
1422                 goto out;
1423         }
1424
1425         ret = -EAGAIN;
1426         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1427                 goto err;
1428         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1429         ret = PTR_ERR(inode);
1430         if (IS_ERR(inode))
1431                 goto err;
1432         ret = -ENOMEM;
1433         state = nfs4_get_open_state(inode, data->owner);
1434         if (state == NULL)
1435                 goto err_put_inode;
1436         if (data->o_res.delegation_type != 0)
1437                 nfs4_opendata_check_deleg(data, state);
1438         update_open_stateid(state, &data->o_res.stateid, NULL,
1439                         data->o_arg.fmode);
1440         iput(inode);
1441 out:
1442         nfs_release_seqid(data->o_arg.seqid);
1443         return state;
1444 err_put_inode:
1445         iput(inode);
1446 err:
1447         return ERR_PTR(ret);
1448 }
1449
1450 static struct nfs4_state *
1451 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1452 {
1453         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1454                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1455         return _nfs4_opendata_to_nfs4_state(data);
1456 }
1457
1458 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1459 {
1460         struct nfs_inode *nfsi = NFS_I(state->inode);
1461         struct nfs_open_context *ctx;
1462
1463         spin_lock(&state->inode->i_lock);
1464         list_for_each_entry(ctx, &nfsi->open_files, list) {
1465                 if (ctx->state != state)
1466                         continue;
1467                 get_nfs_open_context(ctx);
1468                 spin_unlock(&state->inode->i_lock);
1469                 return ctx;
1470         }
1471         spin_unlock(&state->inode->i_lock);
1472         return ERR_PTR(-ENOENT);
1473 }
1474
1475 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1476                 struct nfs4_state *state, enum open_claim_type4 claim)
1477 {
1478         struct nfs4_opendata *opendata;
1479
1480         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1481                         NULL, NULL, claim, GFP_NOFS);
1482         if (opendata == NULL)
1483                 return ERR_PTR(-ENOMEM);
1484         opendata->state = state;
1485         atomic_inc(&state->count);
1486         return opendata;
1487 }
1488
1489 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1490 {
1491         struct nfs4_state *newstate;
1492         int ret;
1493
1494         opendata->o_arg.open_flags = 0;
1495         opendata->o_arg.fmode = fmode;
1496         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1497         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1498         nfs4_init_opendata_res(opendata);
1499         ret = _nfs4_recover_proc_open(opendata);
1500         if (ret != 0)
1501                 return ret;
1502         newstate = nfs4_opendata_to_nfs4_state(opendata);
1503         if (IS_ERR(newstate))
1504                 return PTR_ERR(newstate);
1505         nfs4_close_state(newstate, fmode);
1506         *res = newstate;
1507         return 0;
1508 }
1509
1510 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1511 {
1512         struct nfs4_state *newstate;
1513         int ret;
1514
1515         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1516         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1517         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1518         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1519         /* memory barrier prior to reading state->n_* */
1520         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1521         clear_bit(NFS_OPEN_STATE, &state->flags);
1522         smp_rmb();
1523         if (state->n_rdwr != 0) {
1524                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1525                 if (ret != 0)
1526                         return ret;
1527                 if (newstate != state)
1528                         return -ESTALE;
1529         }
1530         if (state->n_wronly != 0) {
1531                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1532                 if (ret != 0)
1533                         return ret;
1534                 if (newstate != state)
1535                         return -ESTALE;
1536         }
1537         if (state->n_rdonly != 0) {
1538                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1539                 if (ret != 0)
1540                         return ret;
1541                 if (newstate != state)
1542                         return -ESTALE;
1543         }
1544         /*
1545          * We may have performed cached opens for all three recoveries.
1546          * Check if we need to update the current stateid.
1547          */
1548         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1549             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1550                 write_seqlock(&state->seqlock);
1551                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1552                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1553                 write_sequnlock(&state->seqlock);
1554         }
1555         return 0;
1556 }
1557
1558 /*
1559  * OPEN_RECLAIM:
1560  *      reclaim state on the server after a reboot.
1561  */
1562 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1563 {
1564         struct nfs_delegation *delegation;
1565         struct nfs4_opendata *opendata;
1566         fmode_t delegation_type = 0;
1567         int status;
1568
1569         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1570                         NFS4_OPEN_CLAIM_PREVIOUS);
1571         if (IS_ERR(opendata))
1572                 return PTR_ERR(opendata);
1573         rcu_read_lock();
1574         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1575         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1576                 delegation_type = delegation->type;
1577         rcu_read_unlock();
1578         opendata->o_arg.u.delegation_type = delegation_type;
1579         status = nfs4_open_recover(opendata, state);
1580         nfs4_opendata_put(opendata);
1581         return status;
1582 }
1583
1584 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1585 {
1586         struct nfs_server *server = NFS_SERVER(state->inode);
1587         struct nfs4_exception exception = { };
1588         int err;
1589         do {
1590                 err = _nfs4_do_open_reclaim(ctx, state);
1591                 trace_nfs4_open_reclaim(ctx, 0, err);
1592                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1593                         continue;
1594                 if (err != -NFS4ERR_DELAY)
1595                         break;
1596                 nfs4_handle_exception(server, err, &exception);
1597         } while (exception.retry);
1598         return err;
1599 }
1600
1601 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1602 {
1603         struct nfs_open_context *ctx;
1604         int ret;
1605
1606         ctx = nfs4_state_find_open_context(state);
1607         if (IS_ERR(ctx))
1608                 return -EAGAIN;
1609         ret = nfs4_do_open_reclaim(ctx, state);
1610         put_nfs_open_context(ctx);
1611         return ret;
1612 }
1613
1614 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1615 {
1616         switch (err) {
1617                 default:
1618                         printk(KERN_ERR "NFS: %s: unhandled error "
1619                                         "%d.\n", __func__, err);
1620                 case 0:
1621                 case -ENOENT:
1622                 case -ESTALE:
1623                         break;
1624                 case -NFS4ERR_BADSESSION:
1625                 case -NFS4ERR_BADSLOT:
1626                 case -NFS4ERR_BAD_HIGH_SLOT:
1627                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1628                 case -NFS4ERR_DEADSESSION:
1629                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1630                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1631                         return -EAGAIN;
1632                 case -NFS4ERR_STALE_CLIENTID:
1633                 case -NFS4ERR_STALE_STATEID:
1634                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1635                 case -NFS4ERR_EXPIRED:
1636                         /* Don't recall a delegation if it was lost */
1637                         nfs4_schedule_lease_recovery(server->nfs_client);
1638                         return -EAGAIN;
1639                 case -NFS4ERR_MOVED:
1640                         nfs4_schedule_migration_recovery(server);
1641                         return -EAGAIN;
1642                 case -NFS4ERR_LEASE_MOVED:
1643                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1644                         return -EAGAIN;
1645                 case -NFS4ERR_DELEG_REVOKED:
1646                 case -NFS4ERR_ADMIN_REVOKED:
1647                 case -NFS4ERR_BAD_STATEID:
1648                 case -NFS4ERR_OPENMODE:
1649                         nfs_inode_find_state_and_recover(state->inode,
1650                                         stateid);
1651                         nfs4_schedule_stateid_recovery(server, state);
1652                         return -EAGAIN;
1653                 case -NFS4ERR_DELAY:
1654                 case -NFS4ERR_GRACE:
1655                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1656                         ssleep(1);
1657                         return -EAGAIN;
1658                 case -ENOMEM:
1659                 case -NFS4ERR_DENIED:
1660                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1661                         return 0;
1662         }
1663         return err;
1664 }
1665
1666 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1667 {
1668         struct nfs_server *server = NFS_SERVER(state->inode);
1669         struct nfs4_opendata *opendata;
1670         int err;
1671
1672         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1673                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1674         if (IS_ERR(opendata))
1675                 return PTR_ERR(opendata);
1676         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1677         err = nfs4_open_recover(opendata, state);
1678         nfs4_opendata_put(opendata);
1679         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1680 }
1681
1682 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1683 {
1684         struct nfs4_opendata *data = calldata;
1685
1686         nfs40_setup_sequence(data->o_arg.server, &data->c_arg.seq_args,
1687                                 &data->c_res.seq_res, task);
1688 }
1689
1690 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1691 {
1692         struct nfs4_opendata *data = calldata;
1693
1694         nfs40_sequence_done(task, &data->c_res.seq_res);
1695
1696         data->rpc_status = task->tk_status;
1697         if (data->rpc_status == 0) {
1698                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1699                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1700                 renew_lease(data->o_res.server, data->timestamp);
1701                 data->rpc_done = 1;
1702         }
1703 }
1704
1705 static void nfs4_open_confirm_release(void *calldata)
1706 {
1707         struct nfs4_opendata *data = calldata;
1708         struct nfs4_state *state = NULL;
1709
1710         /* If this request hasn't been cancelled, do nothing */
1711         if (data->cancelled == 0)
1712                 goto out_free;
1713         /* In case of error, no cleanup! */
1714         if (!data->rpc_done)
1715                 goto out_free;
1716         state = nfs4_opendata_to_nfs4_state(data);
1717         if (!IS_ERR(state))
1718                 nfs4_close_state(state, data->o_arg.fmode);
1719 out_free:
1720         nfs4_opendata_put(data);
1721 }
1722
1723 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1724         .rpc_call_prepare = nfs4_open_confirm_prepare,
1725         .rpc_call_done = nfs4_open_confirm_done,
1726         .rpc_release = nfs4_open_confirm_release,
1727 };
1728
1729 /*
1730  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1731  */
1732 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1733 {
1734         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1735         struct rpc_task *task;
1736         struct  rpc_message msg = {
1737                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1738                 .rpc_argp = &data->c_arg,
1739                 .rpc_resp = &data->c_res,
1740                 .rpc_cred = data->owner->so_cred,
1741         };
1742         struct rpc_task_setup task_setup_data = {
1743                 .rpc_client = server->client,
1744                 .rpc_message = &msg,
1745                 .callback_ops = &nfs4_open_confirm_ops,
1746                 .callback_data = data,
1747                 .workqueue = nfsiod_workqueue,
1748                 .flags = RPC_TASK_ASYNC,
1749         };
1750         int status;
1751
1752         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1753         kref_get(&data->kref);
1754         data->rpc_done = 0;
1755         data->rpc_status = 0;
1756         data->timestamp = jiffies;
1757         task = rpc_run_task(&task_setup_data);
1758         if (IS_ERR(task))
1759                 return PTR_ERR(task);
1760         status = nfs4_wait_for_completion_rpc_task(task);
1761         if (status != 0) {
1762                 data->cancelled = 1;
1763                 smp_wmb();
1764         } else
1765                 status = data->rpc_status;
1766         rpc_put_task(task);
1767         return status;
1768 }
1769
1770 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1771 {
1772         struct nfs4_opendata *data = calldata;
1773         struct nfs4_state_owner *sp = data->owner;
1774         struct nfs_client *clp = sp->so_server->nfs_client;
1775
1776         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1777                 goto out_wait;
1778         /*
1779          * Check if we still need to send an OPEN call, or if we can use
1780          * a delegation instead.
1781          */
1782         if (data->state != NULL) {
1783                 struct nfs_delegation *delegation;
1784
1785                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1786                         goto out_no_action;
1787                 rcu_read_lock();
1788                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1789                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1790                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1791                     can_open_delegated(delegation, data->o_arg.fmode))
1792                         goto unlock_no_action;
1793                 rcu_read_unlock();
1794         }
1795         /* Update client id. */
1796         data->o_arg.clientid = clp->cl_clientid;
1797         switch (data->o_arg.claim) {
1798         case NFS4_OPEN_CLAIM_PREVIOUS:
1799         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1800         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1801                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1802         case NFS4_OPEN_CLAIM_FH:
1803                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1804                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1805         }
1806         data->timestamp = jiffies;
1807         if (nfs4_setup_sequence(data->o_arg.server,
1808                                 &data->o_arg.seq_args,
1809                                 &data->o_res.seq_res,
1810                                 task) != 0)
1811                 nfs_release_seqid(data->o_arg.seqid);
1812
1813         /* Set the create mode (note dependency on the session type) */
1814         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1815         if (data->o_arg.open_flags & O_EXCL) {
1816                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1817                 if (nfs4_has_persistent_session(clp))
1818                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1819                 else if (clp->cl_mvops->minor_version > 0)
1820                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1821         }
1822         return;
1823 unlock_no_action:
1824         rcu_read_unlock();
1825 out_no_action:
1826         task->tk_action = NULL;
1827 out_wait:
1828         nfs4_sequence_done(task, &data->o_res.seq_res);
1829 }
1830
1831 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1832 {
1833         struct nfs4_opendata *data = calldata;
1834
1835         data->rpc_status = task->tk_status;
1836
1837         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1838                 return;
1839
1840         if (task->tk_status == 0) {
1841                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1842                         switch (data->o_res.f_attr->mode & S_IFMT) {
1843                         case S_IFREG:
1844                                 break;
1845                         case S_IFLNK:
1846                                 data->rpc_status = -ELOOP;
1847                                 break;
1848                         case S_IFDIR:
1849                                 data->rpc_status = -EISDIR;
1850                                 break;
1851                         default:
1852                                 data->rpc_status = -ENOTDIR;
1853                         }
1854                 }
1855                 renew_lease(data->o_res.server, data->timestamp);
1856                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1857                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1858         }
1859         data->rpc_done = 1;
1860 }
1861
1862 static void nfs4_open_release(void *calldata)
1863 {
1864         struct nfs4_opendata *data = calldata;
1865         struct nfs4_state *state = NULL;
1866
1867         /* If this request hasn't been cancelled, do nothing */
1868         if (data->cancelled == 0)
1869                 goto out_free;
1870         /* In case of error, no cleanup! */
1871         if (data->rpc_status != 0 || !data->rpc_done)
1872                 goto out_free;
1873         /* In case we need an open_confirm, no cleanup! */
1874         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1875                 goto out_free;
1876         state = nfs4_opendata_to_nfs4_state(data);
1877         if (!IS_ERR(state))
1878                 nfs4_close_state(state, data->o_arg.fmode);
1879 out_free:
1880         nfs4_opendata_put(data);
1881 }
1882
1883 static const struct rpc_call_ops nfs4_open_ops = {
1884         .rpc_call_prepare = nfs4_open_prepare,
1885         .rpc_call_done = nfs4_open_done,
1886         .rpc_release = nfs4_open_release,
1887 };
1888
1889 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1890 {
1891         struct inode *dir = data->dir->d_inode;
1892         struct nfs_server *server = NFS_SERVER(dir);
1893         struct nfs_openargs *o_arg = &data->o_arg;
1894         struct nfs_openres *o_res = &data->o_res;
1895         struct rpc_task *task;
1896         struct rpc_message msg = {
1897                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1898                 .rpc_argp = o_arg,
1899                 .rpc_resp = o_res,
1900                 .rpc_cred = data->owner->so_cred,
1901         };
1902         struct rpc_task_setup task_setup_data = {
1903                 .rpc_client = server->client,
1904                 .rpc_message = &msg,
1905                 .callback_ops = &nfs4_open_ops,
1906                 .callback_data = data,
1907                 .workqueue = nfsiod_workqueue,
1908                 .flags = RPC_TASK_ASYNC,
1909         };
1910         int status;
1911
1912         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1913         kref_get(&data->kref);
1914         data->rpc_done = 0;
1915         data->rpc_status = 0;
1916         data->cancelled = 0;
1917         data->is_recover = 0;
1918         if (isrecover) {
1919                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1920                 data->is_recover = 1;
1921         }
1922         task = rpc_run_task(&task_setup_data);
1923         if (IS_ERR(task))
1924                 return PTR_ERR(task);
1925         status = nfs4_wait_for_completion_rpc_task(task);
1926         if (status != 0) {
1927                 data->cancelled = 1;
1928                 smp_wmb();
1929         } else
1930                 status = data->rpc_status;
1931         rpc_put_task(task);
1932
1933         return status;
1934 }
1935
1936 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1937 {
1938         struct inode *dir = data->dir->d_inode;
1939         struct nfs_openres *o_res = &data->o_res;
1940         int status;
1941
1942         status = nfs4_run_open_task(data, 1);
1943         if (status != 0 || !data->rpc_done)
1944                 return status;
1945
1946         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1947
1948         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1949                 status = _nfs4_proc_open_confirm(data);
1950                 if (status != 0)
1951                         return status;
1952         }
1953
1954         return status;
1955 }
1956
1957 /*
1958  * Additional permission checks in order to distinguish between an
1959  * open for read, and an open for execute. This works around the
1960  * fact that NFSv4 OPEN treats read and execute permissions as being
1961  * the same.
1962  * Note that in the non-execute case, we want to turn off permission
1963  * checking if we just created a new file (POSIX open() semantics).
1964  */
1965 static int nfs4_opendata_access(struct rpc_cred *cred,
1966                                 struct nfs4_opendata *opendata,
1967                                 struct nfs4_state *state, fmode_t fmode,
1968                                 int openflags)
1969 {
1970         struct nfs_access_entry cache;
1971         u32 mask;
1972
1973         /* access call failed or for some reason the server doesn't
1974          * support any access modes -- defer access call until later */
1975         if (opendata->o_res.access_supported == 0)
1976                 return 0;
1977
1978         mask = 0;
1979         /*
1980          * Use openflags to check for exec, because fmode won't
1981          * always have FMODE_EXEC set when file open for exec.
1982          */
1983         if (openflags & __FMODE_EXEC) {
1984                 /* ONLY check for exec rights */
1985                 mask = MAY_EXEC;
1986         } else if ((fmode & FMODE_READ) && !opendata->file_created)
1987                 mask = MAY_READ;
1988
1989         cache.cred = cred;
1990         cache.jiffies = jiffies;
1991         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1992         nfs_access_add_cache(state->inode, &cache);
1993
1994         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1995                 return 0;
1996
1997         /* even though OPEN succeeded, access is denied. Close the file */
1998         nfs4_close_state(state, fmode);
1999         return -EACCES;
2000 }
2001
2002 /*
2003  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2004  */
2005 static int _nfs4_proc_open(struct nfs4_opendata *data)
2006 {
2007         struct inode *dir = data->dir->d_inode;
2008         struct nfs_server *server = NFS_SERVER(dir);
2009         struct nfs_openargs *o_arg = &data->o_arg;
2010         struct nfs_openres *o_res = &data->o_res;
2011         int status;
2012
2013         status = nfs4_run_open_task(data, 0);
2014         if (!data->rpc_done)
2015                 return status;
2016         if (status != 0) {
2017                 if (status == -NFS4ERR_BADNAME &&
2018                                 !(o_arg->open_flags & O_CREAT))
2019                         return -ENOENT;
2020                 return status;
2021         }
2022
2023         nfs_fattr_map_and_free_names(server, &data->f_attr);
2024
2025         if (o_arg->open_flags & O_CREAT) {
2026                 update_changeattr(dir, &o_res->cinfo);
2027                 if (o_arg->open_flags & O_EXCL)
2028                         data->file_created = 1;
2029                 else if (o_res->cinfo.before != o_res->cinfo.after)
2030                         data->file_created = 1;
2031         }
2032         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2033                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2034         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2035                 status = _nfs4_proc_open_confirm(data);
2036                 if (status != 0)
2037                         return status;
2038         }
2039         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2040                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2041         return 0;
2042 }
2043
2044 static int nfs4_recover_expired_lease(struct nfs_server *server)
2045 {
2046         return nfs4_client_recover_expired_lease(server->nfs_client);
2047 }
2048
2049 /*
2050  * OPEN_EXPIRED:
2051  *      reclaim state on the server after a network partition.
2052  *      Assumes caller holds the appropriate lock
2053  */
2054 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2055 {
2056         struct nfs4_opendata *opendata;
2057         int ret;
2058
2059         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2060                         NFS4_OPEN_CLAIM_FH);
2061         if (IS_ERR(opendata))
2062                 return PTR_ERR(opendata);
2063         ret = nfs4_open_recover(opendata, state);
2064         if (ret == -ESTALE)
2065                 d_drop(ctx->dentry);
2066         nfs4_opendata_put(opendata);
2067         return ret;
2068 }
2069
2070 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2071 {
2072         struct nfs_server *server = NFS_SERVER(state->inode);
2073         struct nfs4_exception exception = { };
2074         int err;
2075
2076         do {
2077                 err = _nfs4_open_expired(ctx, state);
2078                 trace_nfs4_open_expired(ctx, 0, err);
2079                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2080                         continue;
2081                 switch (err) {
2082                 default:
2083                         goto out;
2084                 case -NFS4ERR_GRACE:
2085                 case -NFS4ERR_DELAY:
2086                         nfs4_handle_exception(server, err, &exception);
2087                         err = 0;
2088                 }
2089         } while (exception.retry);
2090 out:
2091         return err;
2092 }
2093
2094 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2095 {
2096         struct nfs_open_context *ctx;
2097         int ret;
2098
2099         ctx = nfs4_state_find_open_context(state);
2100         if (IS_ERR(ctx))
2101                 return -EAGAIN;
2102         ret = nfs4_do_open_expired(ctx, state);
2103         put_nfs_open_context(ctx);
2104         return ret;
2105 }
2106
2107 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2108 {
2109         nfs_remove_bad_delegation(state->inode);
2110         write_seqlock(&state->seqlock);
2111         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2112         write_sequnlock(&state->seqlock);
2113         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2114 }
2115
2116 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2117 {
2118         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2119                 nfs_finish_clear_delegation_stateid(state);
2120 }
2121
2122 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2123 {
2124         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2125         nfs40_clear_delegation_stateid(state);
2126         return nfs4_open_expired(sp, state);
2127 }
2128
2129 #if defined(CONFIG_NFS_V4_1)
2130 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2131 {
2132         struct nfs_server *server = NFS_SERVER(state->inode);
2133         nfs4_stateid stateid;
2134         struct nfs_delegation *delegation;
2135         struct rpc_cred *cred;
2136         int status;
2137
2138         /* Get the delegation credential for use by test/free_stateid */
2139         rcu_read_lock();
2140         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2141         if (delegation == NULL) {
2142                 rcu_read_unlock();
2143                 return;
2144         }
2145
2146         nfs4_stateid_copy(&stateid, &delegation->stateid);
2147         cred = get_rpccred(delegation->cred);
2148         rcu_read_unlock();
2149         status = nfs41_test_stateid(server, &stateid, cred);
2150         trace_nfs4_test_delegation_stateid(state, NULL, status);
2151
2152         if (status != NFS_OK) {
2153                 /* Free the stateid unless the server explicitly
2154                  * informs us the stateid is unrecognized. */
2155                 if (status != -NFS4ERR_BAD_STATEID)
2156                         nfs41_free_stateid(server, &stateid, cred);
2157                 nfs_finish_clear_delegation_stateid(state);
2158         }
2159
2160         put_rpccred(cred);
2161 }
2162
2163 /**
2164  * nfs41_check_open_stateid - possibly free an open stateid
2165  *
2166  * @state: NFSv4 state for an inode
2167  *
2168  * Returns NFS_OK if recovery for this stateid is now finished.
2169  * Otherwise a negative NFS4ERR value is returned.
2170  */
2171 static int nfs41_check_open_stateid(struct nfs4_state *state)
2172 {
2173         struct nfs_server *server = NFS_SERVER(state->inode);
2174         nfs4_stateid *stateid = &state->open_stateid;
2175         struct rpc_cred *cred = state->owner->so_cred;
2176         int status;
2177
2178         /* If a state reset has been done, test_stateid is unneeded */
2179         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2180             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2181             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2182                 return -NFS4ERR_BAD_STATEID;
2183
2184         status = nfs41_test_stateid(server, stateid, cred);
2185         trace_nfs4_test_open_stateid(state, NULL, status);
2186         if (status != NFS_OK) {
2187                 /* Free the stateid unless the server explicitly
2188                  * informs us the stateid is unrecognized. */
2189                 if (status != -NFS4ERR_BAD_STATEID)
2190                         nfs41_free_stateid(server, stateid, cred);
2191
2192                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2193                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2194                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2195                 clear_bit(NFS_OPEN_STATE, &state->flags);
2196         }
2197         return status;
2198 }
2199
2200 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2201 {
2202         int status;
2203
2204         nfs41_check_delegation_stateid(state);
2205         status = nfs41_check_open_stateid(state);
2206         if (status != NFS_OK)
2207                 status = nfs4_open_expired(sp, state);
2208         return status;
2209 }
2210 #endif
2211
2212 /*
2213  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2214  * fields corresponding to attributes that were used to store the verifier.
2215  * Make sure we clobber those fields in the later setattr call
2216  */
2217 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2218 {
2219         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2220             !(sattr->ia_valid & ATTR_ATIME_SET))
2221                 sattr->ia_valid |= ATTR_ATIME;
2222
2223         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2224             !(sattr->ia_valid & ATTR_MTIME_SET))
2225                 sattr->ia_valid |= ATTR_MTIME;
2226 }
2227
2228 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2229                 fmode_t fmode,
2230                 int flags,
2231                 struct nfs_open_context *ctx)
2232 {
2233         struct nfs4_state_owner *sp = opendata->owner;
2234         struct nfs_server *server = sp->so_server;
2235         struct dentry *dentry;
2236         struct nfs4_state *state;
2237         unsigned int seq;
2238         int ret;
2239
2240         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2241
2242         ret = _nfs4_proc_open(opendata);
2243         if (ret != 0)
2244                 goto out;
2245
2246         state = nfs4_opendata_to_nfs4_state(opendata);
2247         ret = PTR_ERR(state);
2248         if (IS_ERR(state))
2249                 goto out;
2250         if (server->caps & NFS_CAP_POSIX_LOCK)
2251                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2252
2253         dentry = opendata->dentry;
2254         if (dentry->d_inode == NULL) {
2255                 /* FIXME: Is this d_drop() ever needed? */
2256                 d_drop(dentry);
2257                 dentry = d_add_unique(dentry, igrab(state->inode));
2258                 if (dentry == NULL) {
2259                         dentry = opendata->dentry;
2260                 } else if (dentry != ctx->dentry) {
2261                         dput(ctx->dentry);
2262                         ctx->dentry = dget(dentry);
2263                 }
2264                 nfs_set_verifier(dentry,
2265                                 nfs_save_change_attribute(opendata->dir->d_inode));
2266         }
2267
2268         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2269         if (ret != 0)
2270                 goto out;
2271
2272         ctx->state = state;
2273         if (dentry->d_inode == state->inode) {
2274                 nfs_inode_attach_open_context(ctx);
2275                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2276                         nfs4_schedule_stateid_recovery(server, state);
2277         }
2278 out:
2279         return ret;
2280 }
2281
2282 /*
2283  * Returns a referenced nfs4_state
2284  */
2285 static int _nfs4_do_open(struct inode *dir,
2286                         struct nfs_open_context *ctx,
2287                         int flags,
2288                         struct iattr *sattr,
2289                         struct nfs4_label *label,
2290                         int *opened)
2291 {
2292         struct nfs4_state_owner  *sp;
2293         struct nfs4_state     *state = NULL;
2294         struct nfs_server       *server = NFS_SERVER(dir);
2295         struct nfs4_opendata *opendata;
2296         struct dentry *dentry = ctx->dentry;
2297         struct rpc_cred *cred = ctx->cred;
2298         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2299         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2300         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2301         struct nfs4_label *olabel = NULL;
2302         int status;
2303
2304         /* Protect against reboot recovery conflicts */
2305         status = -ENOMEM;
2306         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2307         if (sp == NULL) {
2308                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2309                 goto out_err;
2310         }
2311         status = nfs4_recover_expired_lease(server);
2312         if (status != 0)
2313                 goto err_put_state_owner;
2314         if (dentry->d_inode != NULL)
2315                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2316         status = -ENOMEM;
2317         if (dentry->d_inode)
2318                 claim = NFS4_OPEN_CLAIM_FH;
2319         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2320                         label, claim, GFP_KERNEL);
2321         if (opendata == NULL)
2322                 goto err_put_state_owner;
2323
2324         if (label) {
2325                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2326                 if (IS_ERR(olabel)) {
2327                         status = PTR_ERR(olabel);
2328                         goto err_opendata_put;
2329                 }
2330         }
2331
2332         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2333                 if (!opendata->f_attr.mdsthreshold) {
2334                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2335                         if (!opendata->f_attr.mdsthreshold)
2336                                 goto err_free_label;
2337                 }
2338                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2339         }
2340         if (dentry->d_inode != NULL)
2341                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2342
2343         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2344         if (status != 0)
2345                 goto err_free_label;
2346         state = ctx->state;
2347
2348         if ((opendata->o_arg.open_flags & O_EXCL) &&
2349             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2350                 nfs4_exclusive_attrset(opendata, sattr);
2351
2352                 nfs_fattr_init(opendata->o_res.f_attr);
2353                 status = nfs4_do_setattr(state->inode, cred,
2354                                 opendata->o_res.f_attr, sattr,
2355                                 state, label, olabel);
2356                 if (status == 0) {
2357                         nfs_setattr_update_inode(state->inode, sattr);
2358                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2359                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2360                 }
2361         }
2362         if (opendata->file_created)
2363                 *opened |= FILE_CREATED;
2364
2365         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2366                 *ctx_th = opendata->f_attr.mdsthreshold;
2367                 opendata->f_attr.mdsthreshold = NULL;
2368         }
2369
2370         nfs4_label_free(olabel);
2371
2372         nfs4_opendata_put(opendata);
2373         nfs4_put_state_owner(sp);
2374         return 0;
2375 err_free_label:
2376         nfs4_label_free(olabel);
2377 err_opendata_put:
2378         nfs4_opendata_put(opendata);
2379 err_put_state_owner:
2380         nfs4_put_state_owner(sp);
2381 out_err:
2382         return status;
2383 }
2384
2385
2386 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2387                                         struct nfs_open_context *ctx,
2388                                         int flags,
2389                                         struct iattr *sattr,
2390                                         struct nfs4_label *label,
2391                                         int *opened)
2392 {
2393         struct nfs_server *server = NFS_SERVER(dir);
2394         struct nfs4_exception exception = { };
2395         struct nfs4_state *res;
2396         int status;
2397
2398         do {
2399                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2400                 res = ctx->state;
2401                 trace_nfs4_open_file(ctx, flags, status);
2402                 if (status == 0)
2403                         break;
2404                 /* NOTE: BAD_SEQID means the server and client disagree about the
2405                  * book-keeping w.r.t. state-changing operations
2406                  * (OPEN/CLOSE/LOCK/LOCKU...)
2407                  * It is actually a sign of a bug on the client or on the server.
2408                  *
2409                  * If we receive a BAD_SEQID error in the particular case of
2410                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2411                  * have unhashed the old state_owner for us, and that we can
2412                  * therefore safely retry using a new one. We should still warn
2413                  * the user though...
2414                  */
2415                 if (status == -NFS4ERR_BAD_SEQID) {
2416                         pr_warn_ratelimited("NFS: v4 server %s "
2417                                         " returned a bad sequence-id error!\n",
2418                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2419                         exception.retry = 1;
2420                         continue;
2421                 }
2422                 /*
2423                  * BAD_STATEID on OPEN means that the server cancelled our
2424                  * state before it received the OPEN_CONFIRM.
2425                  * Recover by retrying the request as per the discussion
2426                  * on Page 181 of RFC3530.
2427                  */
2428                 if (status == -NFS4ERR_BAD_STATEID) {
2429                         exception.retry = 1;
2430                         continue;
2431                 }
2432                 if (status == -EAGAIN) {
2433                         /* We must have found a delegation */
2434                         exception.retry = 1;
2435                         continue;
2436                 }
2437                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2438                         continue;
2439                 res = ERR_PTR(nfs4_handle_exception(server,
2440                                         status, &exception));
2441         } while (exception.retry);
2442         return res;
2443 }
2444
2445 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2446                             struct nfs_fattr *fattr, struct iattr *sattr,
2447                             struct nfs4_state *state, struct nfs4_label *ilabel,
2448                             struct nfs4_label *olabel)
2449 {
2450         struct nfs_server *server = NFS_SERVER(inode);
2451         struct nfs_setattrargs  arg = {
2452                 .fh             = NFS_FH(inode),
2453                 .iap            = sattr,
2454                 .server         = server,
2455                 .bitmask = server->attr_bitmask,
2456                 .label          = ilabel,
2457         };
2458         struct nfs_setattrres  res = {
2459                 .fattr          = fattr,
2460                 .label          = olabel,
2461                 .server         = server,
2462         };
2463         struct rpc_message msg = {
2464                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2465                 .rpc_argp       = &arg,
2466                 .rpc_resp       = &res,
2467                 .rpc_cred       = cred,
2468         };
2469         unsigned long timestamp = jiffies;
2470         fmode_t fmode;
2471         bool truncate;
2472         int status;
2473
2474         arg.bitmask = nfs4_bitmask(server, ilabel);
2475         if (ilabel)
2476                 arg.bitmask = nfs4_bitmask(server, olabel);
2477
2478         nfs_fattr_init(fattr);
2479
2480         /* Servers should only apply open mode checks for file size changes */
2481         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2482         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2483
2484         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2485                 /* Use that stateid */
2486         } else if (truncate && state != NULL) {
2487                 struct nfs_lockowner lockowner = {
2488                         .l_owner = current->files,
2489                         .l_pid = current->tgid,
2490                 };
2491                 if (!nfs4_valid_open_stateid(state))
2492                         return -EBADF;
2493                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2494                                 &lockowner) == -EIO)
2495                         return -EBADF;
2496         } else
2497                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2498
2499         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2500         if (status == 0 && state != NULL)
2501                 renew_lease(server, timestamp);
2502         return status;
2503 }
2504
2505 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2506                            struct nfs_fattr *fattr, struct iattr *sattr,
2507                            struct nfs4_state *state, struct nfs4_label *ilabel,
2508                            struct nfs4_label *olabel)
2509 {
2510         struct nfs_server *server = NFS_SERVER(inode);
2511         struct nfs4_exception exception = {
2512                 .state = state,
2513                 .inode = inode,
2514         };
2515         int err;
2516         do {
2517                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2518                 trace_nfs4_setattr(inode, err);
2519                 switch (err) {
2520                 case -NFS4ERR_OPENMODE:
2521                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2522                                 pr_warn_once("NFSv4: server %s is incorrectly "
2523                                                 "applying open mode checks to "
2524                                                 "a SETATTR that is not "
2525                                                 "changing file size.\n",
2526                                                 server->nfs_client->cl_hostname);
2527                         }
2528                         if (state && !(state->state & FMODE_WRITE)) {
2529                                 err = -EBADF;
2530                                 if (sattr->ia_valid & ATTR_OPEN)
2531                                         err = -EACCES;
2532                                 goto out;
2533                         }
2534                 }
2535                 err = nfs4_handle_exception(server, err, &exception);
2536         } while (exception.retry);
2537 out:
2538         return err;
2539 }
2540
2541 struct nfs4_closedata {
2542         struct inode *inode;
2543         struct nfs4_state *state;
2544         struct nfs_closeargs arg;
2545         struct nfs_closeres res;
2546         struct nfs_fattr fattr;
2547         unsigned long timestamp;
2548         bool roc;
2549         u32 roc_barrier;
2550 };
2551
2552 static void nfs4_free_closedata(void *data)
2553 {
2554         struct nfs4_closedata *calldata = data;
2555         struct nfs4_state_owner *sp = calldata->state->owner;
2556         struct super_block *sb = calldata->state->inode->i_sb;
2557
2558         if (calldata->roc)
2559                 pnfs_roc_release(calldata->state->inode);
2560         nfs4_put_open_state(calldata->state);
2561         nfs_free_seqid(calldata->arg.seqid);
2562         nfs4_put_state_owner(sp);
2563         nfs_sb_deactive(sb);
2564         kfree(calldata);
2565 }
2566
2567 static void nfs4_close_done(struct rpc_task *task, void *data)
2568 {
2569         struct nfs4_closedata *calldata = data;
2570         struct nfs4_state *state = calldata->state;
2571         struct nfs_server *server = NFS_SERVER(calldata->inode);
2572         nfs4_stateid *res_stateid = NULL;
2573
2574         dprintk("%s: begin!\n", __func__);
2575         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2576                 return;
2577         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2578         /* hmm. we are done with the inode, and in the process of freeing
2579          * the state_owner. we keep this around to process errors
2580          */
2581         switch (task->tk_status) {
2582                 case 0:
2583                         res_stateid = &calldata->res.stateid;
2584                         if (calldata->arg.fmode == 0 && calldata->roc)
2585                                 pnfs_roc_set_barrier(state->inode,
2586                                                      calldata->roc_barrier);
2587                         renew_lease(server, calldata->timestamp);
2588                         break;
2589                 case -NFS4ERR_ADMIN_REVOKED:
2590                 case -NFS4ERR_STALE_STATEID:
2591                 case -NFS4ERR_OLD_STATEID:
2592                 case -NFS4ERR_BAD_STATEID:
2593                 case -NFS4ERR_EXPIRED:
2594                         if (calldata->arg.fmode == 0)
2595                                 break;
2596                 default:
2597                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2598                                 rpc_restart_call_prepare(task);
2599                                 goto out_release;
2600                         }
2601         }
2602         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2603 out_release:
2604         nfs_release_seqid(calldata->arg.seqid);
2605         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2606         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2607 }
2608
2609 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2610 {
2611         struct nfs4_closedata *calldata = data;
2612         struct nfs4_state *state = calldata->state;
2613         struct inode *inode = calldata->inode;
2614         bool is_rdonly, is_wronly, is_rdwr;
2615         int call_close = 0;
2616
2617         dprintk("%s: begin!\n", __func__);
2618         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2619                 goto out_wait;
2620
2621         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2622         spin_lock(&state->owner->so_lock);
2623         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2624         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2625         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2626         /* Calculate the change in open mode */
2627         calldata->arg.fmode = 0;
2628         if (state->n_rdwr == 0) {
2629                 if (state->n_rdonly == 0)
2630                         call_close |= is_rdonly;
2631                 else if (is_rdonly)
2632                         calldata->arg.fmode |= FMODE_READ;
2633                 if (state->n_wronly == 0)
2634                         call_close |= is_wronly;
2635                 else if (is_wronly)
2636                         calldata->arg.fmode |= FMODE_WRITE;
2637         } else if (is_rdwr)
2638                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2639
2640         if (calldata->arg.fmode == 0)
2641                 call_close |= is_rdwr;
2642
2643         if (!nfs4_valid_open_stateid(state))
2644                 call_close = 0;
2645         spin_unlock(&state->owner->so_lock);
2646
2647         if (!call_close) {
2648                 /* Note: exit _without_ calling nfs4_close_done */
2649                 goto out_no_action;
2650         }
2651
2652         if (calldata->arg.fmode == 0) {
2653                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2654                 if (calldata->roc &&
2655                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2656                         nfs_release_seqid(calldata->arg.seqid);
2657                         goto out_wait;
2658                     }
2659         }
2660
2661         nfs_fattr_init(calldata->res.fattr);
2662         calldata->timestamp = jiffies;
2663         if (nfs4_setup_sequence(NFS_SERVER(inode),
2664                                 &calldata->arg.seq_args,
2665                                 &calldata->res.seq_res,
2666                                 task) != 0)
2667                 nfs_release_seqid(calldata->arg.seqid);
2668         dprintk("%s: done!\n", __func__);
2669         return;
2670 out_no_action:
2671         task->tk_action = NULL;
2672 out_wait:
2673         nfs4_sequence_done(task, &calldata->res.seq_res);
2674 }
2675
2676 static const struct rpc_call_ops nfs4_close_ops = {
2677         .rpc_call_prepare = nfs4_close_prepare,
2678         .rpc_call_done = nfs4_close_done,
2679         .rpc_release = nfs4_free_closedata,
2680 };
2681
2682 static bool nfs4_state_has_opener(struct nfs4_state *state)
2683 {
2684         /* first check existing openers */
2685         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 &&
2686             state->n_rdonly != 0)
2687                 return true;
2688
2689         if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 &&
2690             state->n_wronly != 0)
2691                 return true;
2692
2693         if (test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 &&
2694             state->n_rdwr != 0)
2695                 return true;
2696
2697         return false;
2698 }
2699
2700 static bool nfs4_roc(struct inode *inode)
2701 {
2702         struct nfs_inode *nfsi = NFS_I(inode);
2703         struct nfs_open_context *ctx;
2704         struct nfs4_state *state;
2705
2706         spin_lock(&inode->i_lock);
2707         list_for_each_entry(ctx, &nfsi->open_files, list) {
2708                 state = ctx->state;
2709                 if (state == NULL)
2710                         continue;
2711                 if (nfs4_state_has_opener(state)) {
2712                         spin_unlock(&inode->i_lock);
2713                         return false;
2714                 }
2715         }
2716         spin_unlock(&inode->i_lock);
2717
2718         if (nfs4_check_delegation(inode, FMODE_READ))
2719                 return false;
2720
2721         return pnfs_roc(inode);
2722 }
2723
2724 /*
2725  * It is possible for data to be read/written from a mem-mapped file
2726  * after the sys_close call (which hits the vfs layer as a flush).
2727  * This means that we can't safely call nfsv4 close on a file until
2728  * the inode is cleared. This in turn means that we are not good
2729  * NFSv4 citizens - we do not indicate to the server to update the file's
2730  * share state even when we are done with one of the three share
2731  * stateid's in the inode.
2732  *
2733  * NOTE: Caller must be holding the sp->so_owner semaphore!
2734  */
2735 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2736 {
2737         struct nfs_server *server = NFS_SERVER(state->inode);
2738         struct nfs4_closedata *calldata;
2739         struct nfs4_state_owner *sp = state->owner;
2740         struct rpc_task *task;
2741         struct rpc_message msg = {
2742                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2743                 .rpc_cred = state->owner->so_cred,
2744         };
2745         struct rpc_task_setup task_setup_data = {
2746                 .rpc_client = server->client,
2747                 .rpc_message = &msg,
2748                 .callback_ops = &nfs4_close_ops,
2749                 .workqueue = nfsiod_workqueue,
2750                 .flags = RPC_TASK_ASYNC,
2751         };
2752         int status = -ENOMEM;
2753
2754         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2755                 &task_setup_data.rpc_client, &msg);
2756
2757         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2758         if (calldata == NULL)
2759                 goto out;
2760         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2761         calldata->inode = state->inode;
2762         calldata->state = state;
2763         calldata->arg.fh = NFS_FH(state->inode);
2764         calldata->arg.stateid = &state->open_stateid;
2765         /* Serialization for the sequence id */
2766         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2767         if (calldata->arg.seqid == NULL)
2768                 goto out_free_calldata;
2769         calldata->arg.fmode = 0;
2770         calldata->arg.bitmask = server->cache_consistency_bitmask;
2771         calldata->res.fattr = &calldata->fattr;
2772         calldata->res.seqid = calldata->arg.seqid;
2773         calldata->res.server = server;
2774         calldata->roc = nfs4_roc(state->inode);
2775         nfs_sb_active(calldata->inode->i_sb);
2776
2777         msg.rpc_argp = &calldata->arg;
2778         msg.rpc_resp = &calldata->res;
2779         task_setup_data.callback_data = calldata;
2780         task = rpc_run_task(&task_setup_data);
2781         if (IS_ERR(task))
2782                 return PTR_ERR(task);
2783         status = 0;
2784         if (wait)
2785                 status = rpc_wait_for_completion_task(task);
2786         rpc_put_task(task);
2787         return status;
2788 out_free_calldata:
2789         kfree(calldata);
2790 out:
2791         nfs4_put_open_state(state);
2792         nfs4_put_state_owner(sp);
2793         return status;
2794 }
2795
2796 static struct inode *
2797 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2798                 int open_flags, struct iattr *attr, int *opened)
2799 {
2800         struct nfs4_state *state;
2801         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2802
2803         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2804
2805         /* Protect against concurrent sillydeletes */
2806         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2807
2808         nfs4_label_release_security(label);
2809
2810         if (IS_ERR(state))
2811                 return ERR_CAST(state);
2812         return state->inode;
2813 }
2814
2815 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2816 {
2817         if (ctx->state == NULL)
2818                 return;
2819         if (is_sync)
2820                 nfs4_close_sync(ctx->state, ctx->mode);
2821         else
2822                 nfs4_close_state(ctx->state, ctx->mode);
2823 }
2824
2825 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2826 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2827 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2828
2829 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2830 {
2831         struct nfs4_server_caps_arg args = {
2832                 .fhandle = fhandle,
2833         };
2834         struct nfs4_server_caps_res res = {};
2835         struct rpc_message msg = {
2836                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2837                 .rpc_argp = &args,
2838                 .rpc_resp = &res,
2839         };
2840         int status;
2841
2842         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2843         if (status == 0) {
2844                 /* Sanity check the server answers */
2845                 switch (server->nfs_client->cl_minorversion) {
2846                 case 0:
2847                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2848                         res.attr_bitmask[2] = 0;
2849                         break;
2850                 case 1:
2851                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2852                         break;
2853                 case 2:
2854                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2855                 }
2856                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2857                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2858                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2859                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2860                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2861                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2862                                 NFS_CAP_SECURITY_LABEL);
2863                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2864                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2865                         server->caps |= NFS_CAP_ACLS;
2866                 if (res.has_links != 0)
2867                         server->caps |= NFS_CAP_HARDLINKS;
2868                 if (res.has_symlinks != 0)
2869                         server->caps |= NFS_CAP_SYMLINKS;
2870                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2871                         server->caps |= NFS_CAP_FILEID;
2872                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2873                         server->caps |= NFS_CAP_MODE;
2874                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2875                         server->caps |= NFS_CAP_NLINK;
2876                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2877                         server->caps |= NFS_CAP_OWNER;
2878                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2879                         server->caps |= NFS_CAP_OWNER_GROUP;
2880                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2881                         server->caps |= NFS_CAP_ATIME;
2882                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2883                         server->caps |= NFS_CAP_CTIME;
2884                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2885                         server->caps |= NFS_CAP_MTIME;
2886 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2887                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2888                         server->caps |= NFS_CAP_SECURITY_LABEL;
2889 #endif
2890                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2891                                 sizeof(server->attr_bitmask));
2892                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2893
2894                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2895                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2896                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2897                 server->cache_consistency_bitmask[2] = 0;
2898                 server->acl_bitmask = res.acl_bitmask;
2899                 server->fh_expire_type = res.fh_expire_type;
2900         }
2901
2902         return status;
2903 }
2904
2905 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2906 {
2907         struct nfs4_exception exception = { };
2908         int err;
2909         do {
2910                 err = nfs4_handle_exception(server,
2911                                 _nfs4_server_capabilities(server, fhandle),
2912                                 &exception);
2913         } while (exception.retry);
2914         return err;
2915 }
2916
2917 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2918                 struct nfs_fsinfo *info)
2919 {
2920         u32 bitmask[3];
2921         struct nfs4_lookup_root_arg args = {
2922                 .bitmask = bitmask,
2923         };
2924         struct nfs4_lookup_res res = {
2925                 .server = server,
2926                 .fattr = info->fattr,
2927                 .fh = fhandle,
2928         };
2929         struct rpc_message msg = {
2930                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2931                 .rpc_argp = &args,
2932                 .rpc_resp = &res,
2933         };
2934
2935         bitmask[0] = nfs4_fattr_bitmap[0];
2936         bitmask[1] = nfs4_fattr_bitmap[1];
2937         /*
2938          * Process the label in the upcoming getfattr
2939          */
2940         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2941
2942         nfs_fattr_init(info->fattr);
2943         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2944 }
2945
2946 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2947                 struct nfs_fsinfo *info)
2948 {
2949         struct nfs4_exception exception = { };
2950         int err;
2951         do {
2952                 err = _nfs4_lookup_root(server, fhandle, info);
2953                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2954                 switch (err) {
2955                 case 0:
2956                 case -NFS4ERR_WRONGSEC:
2957                         goto out;
2958                 default:
2959                         err = nfs4_handle_exception(server, err, &exception);
2960                 }
2961         } while (exception.retry);
2962 out:
2963         return err;
2964 }
2965
2966 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2967                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2968 {
2969         struct rpc_auth_create_args auth_args = {
2970                 .pseudoflavor = flavor,
2971         };
2972         struct rpc_auth *auth;
2973         int ret;
2974
2975         auth = rpcauth_create(&auth_args, server->client);
2976         if (IS_ERR(auth)) {
2977                 ret = -EACCES;
2978                 goto out;
2979         }
2980         ret = nfs4_lookup_root(server, fhandle, info);
2981 out:
2982         return ret;
2983 }
2984
2985 /*
2986  * Retry pseudoroot lookup with various security flavors.  We do this when:
2987  *
2988  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2989  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2990  *
2991  * Returns zero on success, or a negative NFS4ERR value, or a
2992  * negative errno value.
2993  */
2994 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2995                               struct nfs_fsinfo *info)
2996 {
2997         /* Per 3530bis 15.33.5 */
2998         static const rpc_authflavor_t flav_array[] = {
2999                 RPC_AUTH_GSS_KRB5P,
3000                 RPC_AUTH_GSS_KRB5I,
3001                 RPC_AUTH_GSS_KRB5,
3002                 RPC_AUTH_UNIX,                  /* courtesy */
3003                 RPC_AUTH_NULL,
3004         };
3005         int status = -EPERM;
3006         size_t i;
3007
3008         if (server->auth_info.flavor_len > 0) {
3009                 /* try each flavor specified by user */
3010                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3011                         status = nfs4_lookup_root_sec(server, fhandle, info,
3012                                                 server->auth_info.flavors[i]);
3013                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3014                                 continue;
3015                         break;
3016                 }
3017         } else {
3018                 /* no flavors specified by user, try default list */
3019                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3020                         status = nfs4_lookup_root_sec(server, fhandle, info,
3021                                                       flav_array[i]);
3022                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3023                                 continue;
3024                         break;
3025                 }
3026         }
3027
3028         /*
3029          * -EACCESS could mean that the user doesn't have correct permissions
3030          * to access the mount.  It could also mean that we tried to mount
3031          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3032          * existing mount programs don't handle -EACCES very well so it should
3033          * be mapped to -EPERM instead.
3034          */
3035         if (status == -EACCES)
3036                 status = -EPERM;
3037         return status;
3038 }
3039
3040 static int nfs4_do_find_root_sec(struct nfs_server *server,
3041                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3042 {
3043         int mv = server->nfs_client->cl_minorversion;
3044         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3045 }
3046
3047 /**
3048  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3049  * @server: initialized nfs_server handle
3050  * @fhandle: we fill in the pseudo-fs root file handle
3051  * @info: we fill in an FSINFO struct
3052  * @auth_probe: probe the auth flavours
3053  *
3054  * Returns zero on success, or a negative errno.
3055  */
3056 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3057                          struct nfs_fsinfo *info,
3058                          bool auth_probe)
3059 {
3060         int status;
3061
3062         switch (auth_probe) {
3063         case false:
3064                 status = nfs4_lookup_root(server, fhandle, info);
3065                 if (status != -NFS4ERR_WRONGSEC)
3066                         break;
3067         default:
3068                 status = nfs4_do_find_root_sec(server, fhandle, info);
3069         }
3070
3071         if (status == 0)
3072                 status = nfs4_server_capabilities(server, fhandle);
3073         if (status == 0)
3074                 status = nfs4_do_fsinfo(server, fhandle, info);
3075
3076         return nfs4_map_errors(status);
3077 }
3078
3079 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3080                               struct nfs_fsinfo *info)
3081 {
3082         int error;
3083         struct nfs_fattr *fattr = info->fattr;
3084         struct nfs4_label *label = NULL;
3085
3086         error = nfs4_server_capabilities(server, mntfh);
3087         if (error < 0) {
3088                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3089                 return error;
3090         }
3091
3092         label = nfs4_label_alloc(server, GFP_KERNEL);
3093         if (IS_ERR(label))
3094                 return PTR_ERR(label);
3095
3096         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3097         if (error < 0) {
3098                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3099                 goto err_free_label;
3100         }
3101
3102         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3103             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3104                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3105
3106 err_free_label:
3107         nfs4_label_free(label);
3108
3109         return error;
3110 }
3111
3112 /*
3113  * Get locations and (maybe) other attributes of a referral.
3114  * Note that we'll actually follow the referral later when
3115  * we detect fsid mismatch in inode revalidation
3116  */
3117 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3118                              const struct qstr *name, struct nfs_fattr *fattr,
3119                              struct nfs_fh *fhandle)
3120 {
3121         int status = -ENOMEM;
3122         struct page *page = NULL;
3123         struct nfs4_fs_locations *locations = NULL;
3124
3125         page = alloc_page(GFP_KERNEL);
3126         if (page == NULL)
3127                 goto out;
3128         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3129         if (locations == NULL)
3130                 goto out;
3131
3132         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3133         if (status != 0)
3134                 goto out;
3135
3136         /*
3137          * If the fsid didn't change, this is a migration event, not a
3138          * referral.  Cause us to drop into the exception handler, which
3139          * will kick off migration recovery.
3140          */
3141         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3142                 dprintk("%s: server did not return a different fsid for"
3143                         " a referral at %s\n", __func__, name->name);
3144                 status = -NFS4ERR_MOVED;
3145                 goto out;
3146         }
3147         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3148         nfs_fixup_referral_attributes(&locations->fattr);
3149
3150         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3151         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3152         memset(fhandle, 0, sizeof(struct nfs_fh));
3153 out:
3154         if (page)
3155                 __free_page(page);
3156         kfree(locations);
3157         return status;
3158 }
3159
3160 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3161                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3162 {
3163         struct nfs4_getattr_arg args = {
3164                 .fh = fhandle,
3165                 .bitmask = server->attr_bitmask,
3166         };
3167         struct nfs4_getattr_res res = {
3168                 .fattr = fattr,
3169                 .label = label,
3170                 .server = server,
3171         };
3172         struct rpc_message msg = {
3173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3174                 .rpc_argp = &args,
3175                 .rpc_resp = &res,
3176         };
3177
3178         args.bitmask = nfs4_bitmask(server, label);
3179
3180         nfs_fattr_init(fattr);
3181         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3182 }
3183
3184 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3185                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3186 {
3187         struct nfs4_exception exception = { };
3188         int err;
3189         do {
3190                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3191                 trace_nfs4_getattr(server, fhandle, fattr, err);
3192                 err = nfs4_handle_exception(server, err,
3193                                 &exception);
3194         } while (exception.retry);
3195         return err;
3196 }
3197
3198 /*
3199  * The file is not closed if it is opened due to the a request to change
3200  * the size of the file. The open call will not be needed once the
3201  * VFS layer lookup-intents are implemented.
3202  *
3203  * Close is called when the inode is destroyed.
3204  * If we haven't opened the file for O_WRONLY, we
3205  * need to in the size_change case to obtain a stateid.
3206  *
3207  * Got race?
3208  * Because OPEN is always done by name in nfsv4, it is
3209  * possible that we opened a different file by the same
3210  * name.  We can recognize this race condition, but we
3211  * can't do anything about it besides returning an error.
3212  *
3213  * This will be fixed with VFS changes (lookup-intent).
3214  */
3215 static int
3216 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3217                   struct iattr *sattr)
3218 {
3219         struct inode *inode = dentry->d_inode;
3220         struct rpc_cred *cred = NULL;
3221         struct nfs4_state *state = NULL;
3222         struct nfs4_label *label = NULL;
3223         int status;
3224
3225         if (pnfs_ld_layoutret_on_setattr(inode) &&
3226             sattr->ia_valid & ATTR_SIZE &&
3227             sattr->ia_size < i_size_read(inode))
3228                 pnfs_commit_and_return_layout(inode);
3229
3230         nfs_fattr_init(fattr);
3231
3232         /* Deal with open(O_TRUNC) */
3233         if (sattr->ia_valid & ATTR_OPEN)
3234                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3235
3236         /* Optimization: if the end result is no change, don't RPC */
3237         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3238                 return 0;
3239
3240         /* Search for an existing open(O_WRITE) file */
3241         if (sattr->ia_valid & ATTR_FILE) {
3242                 struct nfs_open_context *ctx;
3243
3244                 ctx = nfs_file_open_context(sattr->ia_file);
3245                 if (ctx) {
3246                         cred = ctx->cred;
3247                         state = ctx->state;
3248                 }
3249         }
3250
3251         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3252         if (IS_ERR(label))
3253                 return PTR_ERR(label);
3254
3255         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3256         if (status == 0) {
3257                 nfs_setattr_update_inode(inode, sattr);
3258                 nfs_setsecurity(inode, fattr, label);
3259         }
3260         nfs4_label_free(label);
3261         return status;
3262 }
3263
3264 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3265                 const struct qstr *name, struct nfs_fh *fhandle,
3266                 struct nfs_fattr *fattr, struct nfs4_label *label)
3267 {
3268         struct nfs_server *server = NFS_SERVER(dir);
3269         int                    status;
3270         struct nfs4_lookup_arg args = {
3271                 .bitmask = server->attr_bitmask,
3272                 .dir_fh = NFS_FH(dir),
3273                 .name = name,
3274         };
3275         struct nfs4_lookup_res res = {
3276                 .server = server,
3277                 .fattr = fattr,
3278                 .label = label,
3279                 .fh = fhandle,
3280         };
3281         struct rpc_message msg = {
3282                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3283                 .rpc_argp = &args,
3284                 .rpc_resp = &res,
3285         };
3286
3287         args.bitmask = nfs4_bitmask(server, label);
3288
3289         nfs_fattr_init(fattr);
3290
3291         dprintk("NFS call  lookup %s\n", name->name);
3292         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3293         dprintk("NFS reply lookup: %d\n", status);
3294         return status;
3295 }
3296
3297 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3298 {
3299         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3300                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3301         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3302         fattr->nlink = 2;
3303 }
3304
3305 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3306                                    struct qstr *name, struct nfs_fh *fhandle,
3307                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3308 {
3309         struct nfs4_exception exception = { };
3310         struct rpc_clnt *client = *clnt;
3311         int err;
3312         do {
3313                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3314                 trace_nfs4_lookup(dir, name, err);
3315                 switch (err) {
3316                 case -NFS4ERR_BADNAME:
3317                         err = -ENOENT;
3318                         goto out;
3319                 case -NFS4ERR_MOVED:
3320                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3321                         goto out;
3322                 case -NFS4ERR_WRONGSEC:
3323                         err = -EPERM;
3324                         if (client != *clnt)
3325                                 goto out;
3326                         client = nfs4_negotiate_security(client, dir, name);
3327                         if (IS_ERR(client))
3328                                 return PTR_ERR(client);
3329
3330                         exception.retry = 1;
3331                         break;
3332                 default:
3333                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3334                 }
3335         } while (exception.retry);
3336
3337 out:
3338         if (err == 0)
3339                 *clnt = client;
3340         else if (client != *clnt)
3341                 rpc_shutdown_client(client);
3342
3343         return err;
3344 }
3345
3346 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3347                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3348                             struct nfs4_label *label)
3349 {
3350         int status;
3351         struct rpc_clnt *client = NFS_CLIENT(dir);
3352
3353         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3354         if (client != NFS_CLIENT(dir)) {
3355                 rpc_shutdown_client(client);
3356                 nfs_fixup_secinfo_attributes(fattr);
3357         }
3358         return status;
3359 }
3360
3361 struct rpc_clnt *
3362 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3363                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3364 {
3365         struct rpc_clnt *client = NFS_CLIENT(dir);
3366         int status;
3367
3368         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3369         if (status < 0)
3370                 return ERR_PTR(status);
3371         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3372 }
3373
3374 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3375 {
3376         struct nfs_server *server = NFS_SERVER(inode);
3377         struct nfs4_accessargs args = {
3378                 .fh = NFS_FH(inode),
3379                 .bitmask = server->cache_consistency_bitmask,
3380         };
3381         struct nfs4_accessres res = {
3382                 .server = server,
3383         };
3384         struct rpc_message msg = {
3385                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3386                 .rpc_argp = &args,
3387                 .rpc_resp = &res,
3388                 .rpc_cred = entry->cred,
3389         };
3390         int mode = entry->mask;
3391         int status = 0;
3392
3393         /*
3394          * Determine which access bits we want to ask for...
3395          */
3396         if (mode & MAY_READ)
3397                 args.access |= NFS4_ACCESS_READ;
3398         if (S_ISDIR(inode->i_mode)) {
3399                 if (mode & MAY_WRITE)
3400                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3401                 if (mode & MAY_EXEC)
3402                         args.access |= NFS4_ACCESS_LOOKUP;
3403         } else {
3404                 if (mode & MAY_WRITE)
3405                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3406                 if (mode & MAY_EXEC)
3407                         args.access |= NFS4_ACCESS_EXECUTE;
3408         }
3409
3410         res.fattr = nfs_alloc_fattr();
3411         if (res.fattr == NULL)
3412                 return -ENOMEM;
3413
3414         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3415         if (!status) {
3416                 nfs_access_set_mask(entry, res.access);
3417                 nfs_refresh_inode(inode, res.fattr);
3418         }
3419         nfs_free_fattr(res.fattr);
3420         return status;
3421 }
3422
3423 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3424 {
3425         struct nfs4_exception exception = { };
3426         int err;
3427         do {
3428                 err = _nfs4_proc_access(inode, entry);
3429                 trace_nfs4_access(inode, err);
3430                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3431                                 &exception);
3432         } while (exception.retry);
3433         return err;
3434 }
3435
3436 /*
3437  * TODO: For the time being, we don't try to get any attributes
3438  * along with any of the zero-copy operations READ, READDIR,
3439  * READLINK, WRITE.
3440  *
3441  * In the case of the first three, we want to put the GETATTR
3442  * after the read-type operation -- this is because it is hard
3443  * to predict the length of a GETATTR response in v4, and thus
3444  * align the READ data correctly.  This means that the GETATTR
3445  * may end up partially falling into the page cache, and we should
3446  * shift it into the 'tail' of the xdr_buf before processing.
3447  * To do this efficiently, we need to know the total length
3448  * of data received, which doesn't seem to be available outside
3449  * of the RPC layer.
3450  *
3451  * In the case of WRITE, we also want to put the GETATTR after
3452  * the operation -- in this case because we want to make sure
3453  * we get the post-operation mtime and size.
3454  *
3455  * Both of these changes to the XDR layer would in fact be quite
3456  * minor, but I decided to leave them for a subsequent patch.
3457  */
3458 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3459                 unsigned int pgbase, unsigned int pglen)
3460 {
3461         struct nfs4_readlink args = {
3462                 .fh       = NFS_FH(inode),
3463                 .pgbase   = pgbase,
3464                 .pglen    = pglen,
3465                 .pages    = &page,
3466         };
3467         struct nfs4_readlink_res res;
3468         struct rpc_message msg = {
3469                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3470                 .rpc_argp = &args,
3471                 .rpc_resp = &res,
3472         };
3473
3474         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3475 }
3476
3477 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3478                 unsigned int pgbase, unsigned int pglen)
3479 {
3480         struct nfs4_exception exception = { };
3481         int err;
3482         do {
3483                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3484                 trace_nfs4_readlink(inode, err);
3485                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3486                                 &exception);
3487         } while (exception.retry);
3488         return err;
3489 }
3490
3491 /*
3492  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3493  */
3494 static int
3495 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3496                  int flags)
3497 {
3498         struct nfs4_label l, *ilabel = NULL;
3499         struct nfs_open_context *ctx;
3500         struct nfs4_state *state;
3501         int opened = 0;
3502         int status = 0;
3503
3504         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3505         if (IS_ERR(ctx))
3506                 return PTR_ERR(ctx);
3507
3508         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3509
3510         sattr->ia_mode &= ~current_umask();
3511         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3512         if (IS_ERR(state)) {
3513                 status = PTR_ERR(state);
3514                 goto out;
3515         }
3516 out:
3517         nfs4_label_release_security(ilabel);
3518         put_nfs_open_context(ctx);
3519         return status;
3520 }
3521
3522 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3523 {
3524         struct nfs_server *server = NFS_SERVER(dir);
3525         struct nfs_removeargs args = {
3526                 .fh = NFS_FH(dir),
3527                 .name = *name,
3528         };
3529         struct nfs_removeres res = {
3530                 .server = server,
3531         };
3532         struct rpc_message msg = {
3533                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3534                 .rpc_argp = &args,
3535                 .rpc_resp = &res,
3536         };
3537         int status;
3538
3539         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3540         if (status == 0)
3541                 update_changeattr(dir, &res.cinfo);
3542         return status;
3543 }
3544
3545 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3546 {
3547         struct nfs4_exception exception = { };
3548         int err;
3549         do {
3550                 err = _nfs4_proc_remove(dir, name);
3551                 trace_nfs4_remove(dir, name, err);
3552                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3553                                 &exception);
3554         } while (exception.retry);
3555         return err;
3556 }
3557
3558 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3559 {
3560         struct nfs_server *server = NFS_SERVER(dir);
3561         struct nfs_removeargs *args = msg->rpc_argp;
3562         struct nfs_removeres *res = msg->rpc_resp;
3563
3564         res->server = server;
3565         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3566         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3567
3568         nfs_fattr_init(res->dir_attr);
3569 }
3570
3571 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3572 {
3573         nfs4_setup_sequence(NFS_SERVER(data->dir),
3574                         &data->args.seq_args,
3575                         &data->res.seq_res,
3576                         task);
3577 }
3578
3579 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3580 {
3581         struct nfs_unlinkdata *data = task->tk_calldata;
3582         struct nfs_removeres *res = &data->res;
3583
3584         if (!nfs4_sequence_done(task, &res->seq_res))
3585                 return 0;
3586         if (nfs4_async_handle_error(task, res->server, NULL,
3587                                     &data->timeout) == -EAGAIN)
3588                 return 0;
3589         update_changeattr(dir, &res->cinfo);
3590         return 1;
3591 }
3592
3593 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3594 {
3595         struct nfs_server *server = NFS_SERVER(dir);
3596         struct nfs_renameargs *arg = msg->rpc_argp;
3597         struct nfs_renameres *res = msg->rpc_resp;
3598
3599         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3600         res->server = server;
3601         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3602 }
3603
3604 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3605 {
3606         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3607                         &data->args.seq_args,
3608                         &data->res.seq_res,
3609                         task);
3610 }
3611
3612 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3613                                  struct inode *new_dir)
3614 {
3615         struct nfs_renamedata *data = task->tk_calldata;
3616         struct nfs_renameres *res = &data->res;
3617
3618         if (!nfs4_sequence_done(task, &res->seq_res))
3619                 return 0;
3620         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3621                 return 0;
3622
3623         update_changeattr(old_dir, &res->old_cinfo);
3624         update_changeattr(new_dir, &res->new_cinfo);
3625         return 1;
3626 }
3627
3628 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3629 {
3630         struct nfs_server *server = NFS_SERVER(inode);
3631         struct nfs4_link_arg arg = {
3632                 .fh     = NFS_FH(inode),
3633                 .dir_fh = NFS_FH(dir),
3634                 .name   = name,
3635                 .bitmask = server->attr_bitmask,
3636         };
3637         struct nfs4_link_res res = {
3638                 .server = server,
3639                 .label = NULL,
3640         };
3641         struct rpc_message msg = {
3642                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3643                 .rpc_argp = &arg,
3644                 .rpc_resp = &res,
3645         };
3646         int status = -ENOMEM;
3647
3648         res.fattr = nfs_alloc_fattr();
3649         if (res.fattr == NULL)
3650                 goto out;
3651
3652         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3653         if (IS_ERR(res.label)) {
3654                 status = PTR_ERR(res.label);
3655                 goto out;
3656         }
3657         arg.bitmask = nfs4_bitmask(server, res.label);
3658
3659         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3660         if (!status) {
3661                 update_changeattr(dir, &res.cinfo);
3662                 status = nfs_post_op_update_inode(inode, res.fattr);
3663                 if (!status)
3664                         nfs_setsecurity(inode, res.fattr, res.label);
3665         }
3666
3667
3668         nfs4_label_free(res.label);
3669
3670 out:
3671         nfs_free_fattr(res.fattr);
3672         return status;
3673 }
3674
3675 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3676 {
3677         struct nfs4_exception exception = { };
3678         int err;
3679         do {
3680                 err = nfs4_handle_exception(NFS_SERVER(inode),
3681                                 _nfs4_proc_link(inode, dir, name),
3682                                 &exception);
3683         } while (exception.retry);
3684         return err;
3685 }
3686
3687 struct nfs4_createdata {
3688         struct rpc_message msg;
3689         struct nfs4_create_arg arg;
3690         struct nfs4_create_res res;
3691         struct nfs_fh fh;
3692         struct nfs_fattr fattr;
3693         struct nfs4_label *label;
3694 };
3695
3696 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3697                 struct qstr *name, struct iattr *sattr, u32 ftype)
3698 {
3699         struct nfs4_createdata *data;
3700
3701         data = kzalloc(sizeof(*data), GFP_KERNEL);
3702         if (data != NULL) {
3703                 struct nfs_server *server = NFS_SERVER(dir);
3704
3705                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3706                 if (IS_ERR(data->label))
3707                         goto out_free;
3708
3709                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3710                 data->msg.rpc_argp = &data->arg;
3711                 data->msg.rpc_resp = &data->res;
3712                 data->arg.dir_fh = NFS_FH(dir);
3713                 data->arg.server = server;
3714                 data->arg.name = name;
3715                 data->arg.attrs = sattr;
3716                 data->arg.ftype = ftype;
3717                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3718                 data->res.server = server;
3719                 data->res.fh = &data->fh;
3720                 data->res.fattr = &data->fattr;
3721                 data->res.label = data->label;
3722                 nfs_fattr_init(data->res.fattr);
3723         }
3724         return data;
3725 out_free:
3726         kfree(data);
3727         return NULL;
3728 }
3729
3730 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3731 {
3732         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3733                                     &data->arg.seq_args, &data->res.seq_res, 1);
3734         if (status == 0) {
3735                 update_changeattr(dir, &data->res.dir_cinfo);
3736                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3737         }
3738         return status;
3739 }
3740
3741 static void nfs4_free_createdata(struct nfs4_createdata *data)
3742 {
3743         nfs4_label_free(data->label);
3744         kfree(data);
3745 }
3746
3747 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3748                 struct page *page, unsigned int len, struct iattr *sattr,
3749                 struct nfs4_label *label)
3750 {
3751         struct nfs4_createdata *data;
3752         int status = -ENAMETOOLONG;
3753
3754         if (len > NFS4_MAXPATHLEN)
3755                 goto out;
3756
3757         status = -ENOMEM;
3758         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3759         if (data == NULL)
3760                 goto out;
3761
3762         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3763         data->arg.u.symlink.pages = &page;
3764         data->arg.u.symlink.len = len;
3765         data->arg.label = label;
3766
3767         status = nfs4_do_create(dir, dentry, data);
3768
3769         nfs4_free_createdata(data);
3770 out:
3771         return status;
3772 }
3773
3774 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3775                 struct page *page, unsigned int len, struct iattr *sattr)
3776 {
3777         struct nfs4_exception exception = { };
3778         struct nfs4_label l, *label = NULL;
3779         int err;
3780
3781         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3782
3783         do {
3784                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3785                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3786                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3787                                 &exception);
3788         } while (exception.retry);
3789
3790         nfs4_label_release_security(label);
3791         return err;
3792 }
3793
3794 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3795                 struct iattr *sattr, struct nfs4_label *label)
3796 {
3797         struct nfs4_createdata *data;
3798         int status = -ENOMEM;
3799
3800         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3801         if (data == NULL)
3802                 goto out;
3803
3804         data->arg.label = label;
3805         status = nfs4_do_create(dir, dentry, data);
3806
3807         nfs4_free_createdata(data);
3808 out:
3809         return status;
3810 }
3811
3812 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3813                 struct iattr *sattr)
3814 {
3815         struct nfs4_exception exception = { };
3816         struct nfs4_label l, *label = NULL;
3817         int err;
3818
3819         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3820
3821         sattr->ia_mode &= ~current_umask();
3822         do {
3823                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3824                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3825                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3826                                 &exception);
3827         } while (exception.retry);
3828         nfs4_label_release_security(label);
3829
3830         return err;
3831 }
3832
3833 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3834                 u64 cookie, struct page **pages, unsigned int count, int plus)
3835 {
3836         struct inode            *dir = dentry->d_inode;
3837         struct nfs4_readdir_arg args = {
3838                 .fh = NFS_FH(dir),
3839                 .pages = pages,
3840                 .pgbase = 0,
3841                 .count = count,
3842                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3843                 .plus = plus,
3844         };
3845         struct nfs4_readdir_res res;
3846         struct rpc_message msg = {
3847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3848                 .rpc_argp = &args,
3849                 .rpc_resp = &res,
3850                 .rpc_cred = cred,
3851         };
3852         int                     status;
3853
3854         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3855                         dentry,
3856                         (unsigned long long)cookie);
3857         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3858         res.pgbase = args.pgbase;
3859         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3860         if (status >= 0) {
3861                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3862                 status += args.pgbase;
3863         }
3864
3865         nfs_invalidate_atime(dir);
3866
3867         dprintk("%s: returns %d\n", __func__, status);
3868         return status;
3869 }
3870
3871 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3872                 u64 cookie, struct page **pages, unsigned int count, int plus)
3873 {
3874         struct nfs4_exception exception = { };
3875         int err;
3876         do {
3877                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3878                                 pages, count, plus);
3879                 trace_nfs4_readdir(dentry->d_inode, err);
3880                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3881                                 &exception);
3882         } while (exception.retry);
3883         return err;
3884 }
3885
3886 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3887                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3888 {
3889         struct nfs4_createdata *data;
3890         int mode = sattr->ia_mode;
3891         int status = -ENOMEM;
3892
3893         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3894         if (data == NULL)
3895                 goto out;
3896
3897         if (S_ISFIFO(mode))
3898                 data->arg.ftype = NF4FIFO;
3899         else if (S_ISBLK(mode)) {
3900                 data->arg.ftype = NF4BLK;
3901                 data->arg.u.device.specdata1 = MAJOR(rdev);
3902                 data->arg.u.device.specdata2 = MINOR(rdev);
3903         }
3904         else if (S_ISCHR(mode)) {
3905                 data->arg.ftype = NF4CHR;
3906                 data->arg.u.device.specdata1 = MAJOR(rdev);
3907                 data->arg.u.device.specdata2 = MINOR(rdev);
3908         } else if (!S_ISSOCK(mode)) {
3909                 status = -EINVAL;
3910                 goto out_free;
3911         }
3912
3913         data->arg.label = label;
3914         status = nfs4_do_create(dir, dentry, data);
3915 out_free:
3916         nfs4_free_createdata(data);
3917 out:
3918         return status;
3919 }
3920
3921 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3922                 struct iattr *sattr, dev_t rdev)
3923 {
3924         struct nfs4_exception exception = { };
3925         struct nfs4_label l, *label = NULL;
3926         int err;
3927
3928         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3929
3930         sattr->ia_mode &= ~current_umask();
3931         do {
3932                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3933                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3934                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3935                                 &exception);
3936         } while (exception.retry);
3937
3938         nfs4_label_release_security(label);
3939
3940         return err;
3941 }
3942
3943 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3944                  struct nfs_fsstat *fsstat)
3945 {
3946         struct nfs4_statfs_arg args = {
3947                 .fh = fhandle,
3948                 .bitmask = server->attr_bitmask,
3949         };
3950         struct nfs4_statfs_res res = {
3951                 .fsstat = fsstat,
3952         };
3953         struct rpc_message msg = {
3954                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3955                 .rpc_argp = &args,
3956                 .rpc_resp = &res,
3957         };
3958
3959         nfs_fattr_init(fsstat->fattr);
3960         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3961 }
3962
3963 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3964 {
3965         struct nfs4_exception exception = { };
3966         int err;
3967         do {
3968                 err = nfs4_handle_exception(server,
3969                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3970                                 &exception);
3971         } while (exception.retry);
3972         return err;
3973 }
3974
3975 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3976                 struct nfs_fsinfo *fsinfo)
3977 {
3978         struct nfs4_fsinfo_arg args = {
3979                 .fh = fhandle,
3980                 .bitmask = server->attr_bitmask,
3981         };
3982         struct nfs4_fsinfo_res res = {
3983                 .fsinfo = fsinfo,
3984         };
3985         struct rpc_message msg = {
3986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3987                 .rpc_argp = &args,
3988                 .rpc_resp = &res,
3989         };
3990
3991         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3992 }
3993
3994 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3995 {
3996         struct nfs4_exception exception = { };
3997         unsigned long now = jiffies;
3998         int err;
3999
4000         do {
4001                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4002                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4003                 if (err == 0) {
4004                         struct nfs_client *clp = server->nfs_client;
4005
4006                         spin_lock(&clp->cl_lock);
4007                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4008                         clp->cl_last_renewal = now;
4009                         spin_unlock(&clp->cl_lock);
4010                         break;
4011                 }
4012                 err = nfs4_handle_exception(server, err, &exception);
4013         } while (exception.retry);
4014         return err;
4015 }
4016
4017 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4018 {
4019         int error;
4020
4021         nfs_fattr_init(fsinfo->fattr);
4022         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4023         if (error == 0) {
4024                 /* block layout checks this! */
4025                 server->pnfs_blksize = fsinfo->blksize;
4026                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4027         }
4028
4029         return error;
4030 }
4031
4032 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4033                 struct nfs_pathconf *pathconf)
4034 {
4035         struct nfs4_pathconf_arg args = {
4036                 .fh = fhandle,
4037                 .bitmask = server->attr_bitmask,
4038         };
4039         struct nfs4_pathconf_res res = {
4040                 .pathconf = pathconf,
4041         };
4042         struct rpc_message msg = {
4043                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4044                 .rpc_argp = &args,
4045                 .rpc_resp = &res,
4046         };
4047
4048         /* None of the pathconf attributes are mandatory to implement */
4049         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4050                 memset(pathconf, 0, sizeof(*pathconf));
4051                 return 0;
4052         }
4053
4054         nfs_fattr_init(pathconf->fattr);
4055         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4056 }
4057
4058 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4059                 struct nfs_pathconf *pathconf)
4060 {
4061         struct nfs4_exception exception = { };
4062         int err;
4063
4064         do {
4065                 err = nfs4_handle_exception(server,
4066                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4067                                 &exception);
4068         } while (exception.retry);
4069         return err;
4070 }
4071
4072 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4073                 const struct nfs_open_context *ctx,
4074                 const struct nfs_lock_context *l_ctx,
4075                 fmode_t fmode)
4076 {
4077         const struct nfs_lockowner *lockowner = NULL;
4078
4079         if (l_ctx != NULL)
4080                 lockowner = &l_ctx->lockowner;
4081         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4082 }
4083 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4084
4085 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4086                 const struct nfs_open_context *ctx,
4087                 const struct nfs_lock_context *l_ctx,
4088                 fmode_t fmode)
4089 {
4090         nfs4_stateid current_stateid;
4091
4092         /* If the current stateid represents a lost lock, then exit */
4093         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4094                 return true;
4095         return nfs4_stateid_match(stateid, &current_stateid);
4096 }
4097
4098 static bool nfs4_error_stateid_expired(int err)
4099 {
4100         switch (err) {
4101         case -NFS4ERR_DELEG_REVOKED:
4102         case -NFS4ERR_ADMIN_REVOKED:
4103         case -NFS4ERR_BAD_STATEID:
4104         case -NFS4ERR_STALE_STATEID:
4105         case -NFS4ERR_OLD_STATEID:
4106         case -NFS4ERR_OPENMODE:
4107         case -NFS4ERR_EXPIRED:
4108                 return true;
4109         }
4110         return false;
4111 }
4112
4113 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4114 {
4115         nfs_invalidate_atime(hdr->inode);
4116 }
4117
4118 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4119 {
4120         struct nfs_server *server = NFS_SERVER(hdr->inode);
4121
4122         trace_nfs4_read(hdr, task->tk_status);
4123         if (nfs4_async_handle_error(task, server,
4124                                     hdr->args.context->state,
4125                                     NULL) == -EAGAIN) {
4126                 rpc_restart_call_prepare(task);
4127                 return -EAGAIN;
4128         }
4129
4130         __nfs4_read_done_cb(hdr);
4131         if (task->tk_status > 0)
4132                 renew_lease(server, hdr->timestamp);
4133         return 0;
4134 }
4135
4136 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4137                 struct nfs_pgio_args *args)
4138 {
4139
4140         if (!nfs4_error_stateid_expired(task->tk_status) ||
4141                 nfs4_stateid_is_current(&args->stateid,
4142                                 args->context,
4143                                 args->lock_context,
4144                                 FMODE_READ))
4145                 return false;
4146         rpc_restart_call_prepare(task);
4147         return true;
4148 }
4149
4150 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4151 {
4152
4153         dprintk("--> %s\n", __func__);
4154
4155         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4156                 return -EAGAIN;
4157         if (nfs4_read_stateid_changed(task, &hdr->args))
4158                 return -EAGAIN;
4159         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4160                                     nfs4_read_done_cb(task, hdr);
4161 }
4162
4163 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4164                                  struct rpc_message *msg)
4165 {
4166         hdr->timestamp   = jiffies;
4167         hdr->pgio_done_cb = nfs4_read_done_cb;
4168         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4169         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4170 }
4171
4172 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4173                                       struct nfs_pgio_header *hdr)
4174 {
4175         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4176                         &hdr->args.seq_args,
4177                         &hdr->res.seq_res,
4178                         task))
4179                 return 0;
4180         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4181                                 hdr->args.lock_context,
4182                                 hdr->rw_ops->rw_mode) == -EIO)
4183                 return -EIO;
4184         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4185                 return -EIO;
4186         return 0;
4187 }
4188
4189 static int nfs4_write_done_cb(struct rpc_task *task,
4190                               struct nfs_pgio_header *hdr)
4191 {
4192         struct inode *inode = hdr->inode;
4193
4194         trace_nfs4_write(hdr, task->tk_status);
4195         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4196                                     hdr->args.context->state,
4197                                     NULL) == -EAGAIN) {
4198                 rpc_restart_call_prepare(task);
4199                 return -EAGAIN;
4200         }
4201         if (task->tk_status >= 0) {
4202                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4203                 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4204         }
4205         return 0;
4206 }
4207
4208 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4209                 struct nfs_pgio_args *args)
4210 {
4211
4212         if (!nfs4_error_stateid_expired(task->tk_status) ||
4213                 nfs4_stateid_is_current(&args->stateid,
4214                                 args->context,
4215                                 args->lock_context,
4216                                 FMODE_WRITE))
4217                 return false;
4218         rpc_restart_call_prepare(task);
4219         return true;
4220 }
4221
4222 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4223 {
4224         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4225                 return -EAGAIN;
4226         if (nfs4_write_stateid_changed(task, &hdr->args))
4227                 return -EAGAIN;
4228         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4229                 nfs4_write_done_cb(task, hdr);
4230 }
4231
4232 static
4233 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4234 {
4235         /* Don't request attributes for pNFS or O_DIRECT writes */
4236         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4237                 return false;
4238         /* Otherwise, request attributes if and only if we don't hold
4239          * a delegation
4240          */
4241         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4242 }
4243
4244 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4245                                   struct rpc_message *msg)
4246 {
4247         struct nfs_server *server = NFS_SERVER(hdr->inode);
4248
4249         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4250                 hdr->args.bitmask = NULL;
4251                 hdr->res.fattr = NULL;
4252         } else
4253                 hdr->args.bitmask = server->cache_consistency_bitmask;
4254
4255         if (!hdr->pgio_done_cb)
4256                 hdr->pgio_done_cb = nfs4_write_done_cb;
4257         hdr->res.server = server;
4258         hdr->timestamp   = jiffies;
4259
4260         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4261         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4262 }
4263
4264 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4265 {
4266         nfs4_setup_sequence(NFS_SERVER(data->inode),
4267                         &data->args.seq_args,
4268                         &data->res.seq_res,
4269                         task);
4270 }
4271
4272 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4273 {
4274         struct inode *inode = data->inode;
4275
4276         trace_nfs4_commit(data, task->tk_status);
4277         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4278                                     NULL, NULL) == -EAGAIN) {
4279                 rpc_restart_call_prepare(task);
4280                 return -EAGAIN;
4281         }
4282         return 0;
4283 }
4284
4285 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4286 {
4287         if (!nfs4_sequence_done(task, &data->res.seq_res))
4288                 return -EAGAIN;
4289         return data->commit_done_cb(task, data);
4290 }
4291
4292 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4293 {
4294         struct nfs_server *server = NFS_SERVER(data->inode);
4295
4296         if (data->commit_done_cb == NULL)
4297                 data->commit_done_cb = nfs4_commit_done_cb;
4298         data->res.server = server;
4299         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4300         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4301 }
4302
4303 struct nfs4_renewdata {
4304         struct nfs_client       *client;
4305         unsigned long           timestamp;
4306 };
4307
4308 /*
4309  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4310  * standalone procedure for queueing an asynchronous RENEW.
4311  */
4312 static void nfs4_renew_release(void *calldata)
4313 {
4314         struct nfs4_renewdata *data = calldata;
4315         struct nfs_client *clp = data->client;
4316
4317         if (atomic_read(&clp->cl_count) > 1)
4318                 nfs4_schedule_state_renewal(clp);
4319         nfs_put_client(clp);
4320         kfree(data);
4321 }
4322
4323 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4324 {
4325         struct nfs4_renewdata *data = calldata;
4326         struct nfs_client *clp = data->client;
4327         unsigned long timestamp = data->timestamp;
4328
4329         trace_nfs4_renew_async(clp, task->tk_status);
4330         switch (task->tk_status) {
4331         case 0:
4332                 break;
4333         case -NFS4ERR_LEASE_MOVED:
4334                 nfs4_schedule_lease_moved_recovery(clp);
4335                 break;
4336         default:
4337                 /* Unless we're shutting down, schedule state recovery! */
4338                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4339                         return;
4340                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4341                         nfs4_schedule_lease_recovery(clp);
4342                         return;
4343                 }
4344                 nfs4_schedule_path_down_recovery(clp);
4345         }
4346         do_renew_lease(clp, timestamp);
4347 }
4348
4349 static const struct rpc_call_ops nfs4_renew_ops = {
4350         .rpc_call_done = nfs4_renew_done,
4351         .rpc_release = nfs4_renew_release,
4352 };
4353
4354 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4355 {
4356         struct rpc_message msg = {
4357                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4358                 .rpc_argp       = clp,
4359                 .rpc_cred       = cred,
4360         };
4361         struct nfs4_renewdata *data;
4362
4363         if (renew_flags == 0)
4364                 return 0;
4365         if (!atomic_inc_not_zero(&clp->cl_count))
4366                 return -EIO;
4367         data = kmalloc(sizeof(*data), GFP_NOFS);
4368         if (data == NULL)
4369                 return -ENOMEM;
4370         data->client = clp;
4371         data->timestamp = jiffies;
4372         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4373                         &nfs4_renew_ops, data);
4374 }
4375
4376 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4377 {
4378         struct rpc_message msg = {
4379                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4380                 .rpc_argp       = clp,
4381                 .rpc_cred       = cred,
4382         };
4383         unsigned long now = jiffies;
4384         int status;
4385
4386         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4387         if (status < 0)
4388                 return status;
4389         do_renew_lease(clp, now);
4390         return 0;
4391 }
4392
4393 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4394 {
4395         return server->caps & NFS_CAP_ACLS;
4396 }
4397
4398 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4399  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4400  * the stack.
4401  */
4402 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4403
4404 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4405                 struct page **pages, unsigned int *pgbase)
4406 {
4407         struct page *newpage, **spages;
4408         int rc = 0;
4409         size_t len;
4410         spages = pages;
4411
4412         do {
4413                 len = min_t(size_t, PAGE_SIZE, buflen);
4414                 newpage = alloc_page(GFP_KERNEL);
4415
4416                 if (newpage == NULL)
4417                         goto unwind;
4418                 memcpy(page_address(newpage), buf, len);
4419                 buf += len;
4420                 buflen -= len;
4421                 *pages++ = newpage;
4422                 rc++;
4423         } while (buflen != 0);
4424
4425         return rc;
4426
4427 unwind:
4428         for(; rc > 0; rc--)
4429                 __free_page(spages[rc-1]);
4430         return -ENOMEM;
4431 }
4432
4433 struct nfs4_cached_acl {
4434         int cached;
4435         size_t len;
4436         char data[0];
4437 };
4438
4439 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4440 {
4441         struct nfs_inode *nfsi = NFS_I(inode);
4442
4443         spin_lock(&inode->i_lock);
4444         kfree(nfsi->nfs4_acl);
4445         nfsi->nfs4_acl = acl;
4446         spin_unlock(&inode->i_lock);
4447 }
4448
4449 static void nfs4_zap_acl_attr(struct inode *inode)
4450 {
4451         nfs4_set_cached_acl(inode, NULL);
4452 }
4453
4454 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4455 {
4456         struct nfs_inode *nfsi = NFS_I(inode);
4457         struct nfs4_cached_acl *acl;
4458         int ret = -ENOENT;
4459
4460         spin_lock(&inode->i_lock);
4461         acl = nfsi->nfs4_acl;
4462         if (acl == NULL)
4463                 goto out;
4464         if (buf == NULL) /* user is just asking for length */
4465                 goto out_len;
4466         if (acl->cached == 0)
4467                 goto out;
4468         ret = -ERANGE; /* see getxattr(2) man page */
4469         if (acl->len > buflen)
4470                 goto out;
4471         memcpy(buf, acl->data, acl->len);
4472 out_len:
4473         ret = acl->len;
4474 out:
4475         spin_unlock(&inode->i_lock);
4476         return ret;
4477 }
4478
4479 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4480 {
4481         struct nfs4_cached_acl *acl;
4482         size_t buflen = sizeof(*acl) + acl_len;
4483
4484         if (buflen <= PAGE_SIZE) {
4485                 acl = kmalloc(buflen, GFP_KERNEL);
4486                 if (acl == NULL)
4487                         goto out;
4488                 acl->cached = 1;
4489                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4490         } else {
4491                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4492                 if (acl == NULL)
4493                         goto out;
4494                 acl->cached = 0;
4495         }
4496         acl->len = acl_len;
4497 out:
4498         nfs4_set_cached_acl(inode, acl);
4499 }
4500
4501 /*
4502  * The getxattr API returns the required buffer length when called with a
4503  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4504  * the required buf.  On a NULL buf, we send a page of data to the server
4505  * guessing that the ACL request can be serviced by a page. If so, we cache
4506  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4507  * the cache. If not so, we throw away the page, and cache the required
4508  * length. The next getxattr call will then produce another round trip to
4509  * the server, this time with the input buf of the required size.
4510  */
4511 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4512 {
4513         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4514         struct nfs_getaclargs args = {
4515                 .fh = NFS_FH(inode),
4516                 .acl_pages = pages,
4517                 .acl_len = buflen,
4518         };
4519         struct nfs_getaclres res = {
4520                 .acl_len = buflen,
4521         };
4522         struct rpc_message msg = {
4523                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4524                 .rpc_argp = &args,
4525                 .rpc_resp = &res,
4526         };
4527         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4528         int ret = -ENOMEM, i;
4529
4530         /* As long as we're doing a round trip to the server anyway,
4531          * let's be prepared for a page of acl data. */
4532         if (npages == 0)
4533                 npages = 1;
4534         if (npages > ARRAY_SIZE(pages))
4535                 return -ERANGE;
4536
4537         for (i = 0; i < npages; i++) {
4538                 pages[i] = alloc_page(GFP_KERNEL);
4539                 if (!pages[i])
4540                         goto out_free;
4541         }
4542
4543         /* for decoding across pages */
4544         res.acl_scratch = alloc_page(GFP_KERNEL);
4545         if (!res.acl_scratch)
4546                 goto out_free;
4547
4548         args.acl_len = npages * PAGE_SIZE;
4549         args.acl_pgbase = 0;
4550
4551         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4552                 __func__, buf, buflen, npages, args.acl_len);
4553         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4554                              &msg, &args.seq_args, &res.seq_res, 0);
4555         if (ret)
4556                 goto out_free;
4557
4558         /* Handle the case where the passed-in buffer is too short */
4559         if (res.acl_flags & NFS4_ACL_TRUNC) {
4560                 /* Did the user only issue a request for the acl length? */
4561                 if (buf == NULL)
4562                         goto out_ok;
4563                 ret = -ERANGE;
4564                 goto out_free;
4565         }
4566         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4567         if (buf) {
4568                 if (res.acl_len > buflen) {
4569                         ret = -ERANGE;
4570                         goto out_free;
4571                 }
4572                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4573         }
4574 out_ok:
4575         ret = res.acl_len;
4576 out_free:
4577         for (i = 0; i < npages; i++)
4578                 if (pages[i])
4579                         __free_page(pages[i]);
4580         if (res.acl_scratch)
4581                 __free_page(res.acl_scratch);
4582         return ret;
4583 }
4584
4585 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4586 {
4587         struct nfs4_exception exception = { };
4588         ssize_t ret;
4589         do {
4590                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4591                 trace_nfs4_get_acl(inode, ret);
4592                 if (ret >= 0)
4593                         break;
4594                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4595         } while (exception.retry);
4596         return ret;
4597 }
4598
4599 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4600 {
4601         struct nfs_server *server = NFS_SERVER(inode);
4602         int ret;
4603
4604         if (!nfs4_server_supports_acls(server))
4605                 return -EOPNOTSUPP;
4606         ret = nfs_revalidate_inode(server, inode);
4607         if (ret < 0)
4608                 return ret;
4609         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4610                 nfs_zap_acl_cache(inode);
4611         ret = nfs4_read_cached_acl(inode, buf, buflen);
4612         if (ret != -ENOENT)
4613                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4614                  * but no cached acl data, just the acl length */
4615                 return ret;
4616         return nfs4_get_acl_uncached(inode, buf, buflen);
4617 }
4618
4619 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4620 {
4621         struct nfs_server *server = NFS_SERVER(inode);
4622         struct page *pages[NFS4ACL_MAXPAGES];
4623         struct nfs_setaclargs arg = {
4624                 .fh             = NFS_FH(inode),
4625                 .acl_pages      = pages,
4626                 .acl_len        = buflen,
4627         };
4628         struct nfs_setaclres res;
4629         struct rpc_message msg = {
4630                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4631                 .rpc_argp       = &arg,
4632                 .rpc_resp       = &res,
4633         };
4634         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4635         int ret, i;
4636
4637         if (!nfs4_server_supports_acls(server))
4638                 return -EOPNOTSUPP;
4639         if (npages > ARRAY_SIZE(pages))
4640                 return -ERANGE;
4641         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4642         if (i < 0)
4643                 return i;
4644         nfs4_inode_return_delegation(inode);
4645         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4646
4647         /*
4648          * Free each page after tx, so the only ref left is
4649          * held by the network stack
4650          */
4651         for (; i > 0; i--)
4652                 put_page(pages[i-1]);
4653
4654         /*
4655          * Acl update can result in inode attribute update.
4656          * so mark the attribute cache invalid.
4657          */
4658         spin_lock(&inode->i_lock);
4659         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4660         spin_unlock(&inode->i_lock);
4661         nfs_access_zap_cache(inode);
4662         nfs_zap_acl_cache(inode);
4663         return ret;
4664 }
4665
4666 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4667 {
4668         struct nfs4_exception exception = { };
4669         int err;
4670         do {
4671                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4672                 trace_nfs4_set_acl(inode, err);
4673                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4674                                 &exception);
4675         } while (exception.retry);
4676         return err;
4677 }
4678
4679 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4680 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4681                                         size_t buflen)
4682 {
4683         struct nfs_server *server = NFS_SERVER(inode);
4684         struct nfs_fattr fattr;
4685         struct nfs4_label label = {0, 0, buflen, buf};
4686
4687         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4688         struct nfs4_getattr_arg arg = {
4689                 .fh             = NFS_FH(inode),
4690                 .bitmask        = bitmask,
4691         };
4692         struct nfs4_getattr_res res = {
4693                 .fattr          = &fattr,
4694                 .label          = &label,
4695                 .server         = server,
4696         };
4697         struct rpc_message msg = {
4698                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4699                 .rpc_argp       = &arg,
4700                 .rpc_resp       = &res,
4701         };
4702         int ret;
4703
4704         nfs_fattr_init(&fattr);
4705
4706         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4707         if (ret)
4708                 return ret;
4709         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4710                 return -ENOENT;
4711         if (buflen < label.len)
4712                 return -ERANGE;
4713         return 0;
4714 }
4715
4716 static int nfs4_get_security_label(struct inode *inode, void *buf,
4717                                         size_t buflen)
4718 {
4719         struct nfs4_exception exception = { };
4720         int err;
4721
4722         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4723                 return -EOPNOTSUPP;
4724
4725         do {
4726                 err = _nfs4_get_security_label(inode, buf, buflen);
4727                 trace_nfs4_get_security_label(inode, err);
4728                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4729                                 &exception);
4730         } while (exception.retry);
4731         return err;
4732 }
4733
4734 static int _nfs4_do_set_security_label(struct inode *inode,
4735                 struct nfs4_label *ilabel,
4736                 struct nfs_fattr *fattr,
4737                 struct nfs4_label *olabel)
4738 {
4739
4740         struct iattr sattr = {0};
4741         struct nfs_server *server = NFS_SERVER(inode);
4742         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4743         struct nfs_setattrargs arg = {
4744                 .fh             = NFS_FH(inode),
4745                 .iap            = &sattr,
4746                 .server         = server,
4747                 .bitmask        = bitmask,
4748                 .label          = ilabel,
4749         };
4750         struct nfs_setattrres res = {
4751                 .fattr          = fattr,
4752                 .label          = olabel,
4753                 .server         = server,
4754         };
4755         struct rpc_message msg = {
4756                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4757                 .rpc_argp       = &arg,
4758                 .rpc_resp       = &res,
4759         };
4760         int status;
4761
4762         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4763
4764         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4765         if (status)
4766                 dprintk("%s failed: %d\n", __func__, status);
4767
4768         return status;
4769 }
4770
4771 static int nfs4_do_set_security_label(struct inode *inode,
4772                 struct nfs4_label *ilabel,
4773                 struct nfs_fattr *fattr,
4774                 struct nfs4_label *olabel)
4775 {
4776         struct nfs4_exception exception = { };
4777         int err;
4778
4779         do {
4780                 err = _nfs4_do_set_security_label(inode, ilabel,
4781                                 fattr, olabel);
4782                 trace_nfs4_set_security_label(inode, err);
4783                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4784                                 &exception);
4785         } while (exception.retry);
4786         return err;
4787 }
4788
4789 static int
4790 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4791 {
4792         struct nfs4_label ilabel, *olabel = NULL;
4793         struct nfs_fattr fattr;
4794         struct rpc_cred *cred;
4795         struct inode *inode = dentry->d_inode;
4796         int status;
4797
4798         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4799                 return -EOPNOTSUPP;
4800
4801         nfs_fattr_init(&fattr);
4802
4803         ilabel.pi = 0;
4804         ilabel.lfs = 0;
4805         ilabel.label = (char *)buf;
4806         ilabel.len = buflen;
4807
4808         cred = rpc_lookup_cred();
4809         if (IS_ERR(cred))
4810                 return PTR_ERR(cred);
4811
4812         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4813         if (IS_ERR(olabel)) {
4814                 status = -PTR_ERR(olabel);
4815                 goto out;
4816         }
4817
4818         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4819         if (status == 0)
4820                 nfs_setsecurity(inode, &fattr, olabel);
4821
4822         nfs4_label_free(olabel);
4823 out:
4824         put_rpccred(cred);
4825         return status;
4826 }
4827 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4828
4829
4830 static int
4831 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4832                         struct nfs4_state *state, long *timeout)
4833 {
4834         struct nfs_client *clp = server->nfs_client;
4835
4836         if (task->tk_status >= 0)
4837                 return 0;
4838         switch(task->tk_status) {
4839                 case -NFS4ERR_DELEG_REVOKED:
4840                 case -NFS4ERR_ADMIN_REVOKED:
4841                 case -NFS4ERR_BAD_STATEID:
4842                 case -NFS4ERR_OPENMODE:
4843                         if (state == NULL)
4844                                 break;
4845                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4846                                 goto recovery_failed;
4847                         goto wait_on_recovery;
4848                 case -NFS4ERR_EXPIRED:
4849                         if (state != NULL) {
4850                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4851                                         goto recovery_failed;
4852                         }
4853                 case -NFS4ERR_STALE_STATEID:
4854                 case -NFS4ERR_STALE_CLIENTID:
4855                         nfs4_schedule_lease_recovery(clp);
4856                         goto wait_on_recovery;
4857                 case -NFS4ERR_MOVED:
4858                         if (nfs4_schedule_migration_recovery(server) < 0)
4859                                 goto recovery_failed;
4860                         goto wait_on_recovery;
4861                 case -NFS4ERR_LEASE_MOVED:
4862                         nfs4_schedule_lease_moved_recovery(clp);
4863                         goto wait_on_recovery;
4864 #if defined(CONFIG_NFS_V4_1)
4865                 case -NFS4ERR_BADSESSION:
4866                 case -NFS4ERR_BADSLOT:
4867                 case -NFS4ERR_BAD_HIGH_SLOT:
4868                 case -NFS4ERR_DEADSESSION:
4869                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4870                 case -NFS4ERR_SEQ_FALSE_RETRY:
4871                 case -NFS4ERR_SEQ_MISORDERED:
4872                         dprintk("%s ERROR %d, Reset session\n", __func__,
4873                                 task->tk_status);
4874                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4875                         goto wait_on_recovery;
4876 #endif /* CONFIG_NFS_V4_1 */
4877                 case -NFS4ERR_DELAY:
4878                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4879                         rpc_delay(task, nfs4_update_delay(timeout));
4880                         goto restart_call;
4881                 case -NFS4ERR_GRACE:
4882                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4883                 case -NFS4ERR_RETRY_UNCACHED_REP:
4884                 case -NFS4ERR_OLD_STATEID:
4885                         goto restart_call;
4886         }
4887         task->tk_status = nfs4_map_errors(task->tk_status);
4888         return 0;
4889 recovery_failed:
4890         task->tk_status = -EIO;
4891         return 0;
4892 wait_on_recovery:
4893         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4894         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4895                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4896         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4897                 goto recovery_failed;
4898 restart_call:
4899         task->tk_status = 0;
4900         return -EAGAIN;
4901 }
4902
4903 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4904                                     nfs4_verifier *bootverf)
4905 {
4906         __be32 verf[2];
4907
4908         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4909                 /* An impossible timestamp guarantees this value
4910                  * will never match a generated boot time. */
4911                 verf[0] = 0;
4912                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4913         } else {
4914                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4915                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4916                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4917         }
4918         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4919 }
4920
4921 static unsigned int
4922 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4923                                    char *buf, size_t len)
4924 {
4925         unsigned int result;
4926
4927         rcu_read_lock();
4928         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4929                                 clp->cl_ipaddr,
4930                                 rpc_peeraddr2str(clp->cl_rpcclient,
4931                                                         RPC_DISPLAY_ADDR),
4932                                 rpc_peeraddr2str(clp->cl_rpcclient,
4933                                                         RPC_DISPLAY_PROTO));
4934         rcu_read_unlock();
4935         return result;
4936 }
4937
4938 static unsigned int
4939 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4940                                 char *buf, size_t len)
4941 {
4942         const char *nodename = clp->cl_rpcclient->cl_nodename;
4943
4944         if (nfs4_client_id_uniquifier[0] != '\0')
4945                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4946                                 clp->rpc_ops->version,
4947                                 clp->cl_minorversion,
4948                                 nfs4_client_id_uniquifier,
4949                                 nodename);
4950         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4951                                 clp->rpc_ops->version, clp->cl_minorversion,
4952                                 nodename);
4953 }
4954
4955 /*
4956  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
4957  * services.  Advertise one based on the address family of the
4958  * clientaddr.
4959  */
4960 static unsigned int
4961 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
4962 {
4963         if (strchr(clp->cl_ipaddr, ':') != NULL)
4964                 return scnprintf(buf, len, "tcp6");
4965         else
4966                 return scnprintf(buf, len, "tcp");
4967 }
4968
4969 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
4970 {
4971         struct nfs4_setclientid *sc = calldata;
4972
4973         if (task->tk_status == 0)
4974                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
4975 }
4976
4977 static const struct rpc_call_ops nfs4_setclientid_ops = {
4978         .rpc_call_done = nfs4_setclientid_done,
4979 };
4980
4981 /**
4982  * nfs4_proc_setclientid - Negotiate client ID
4983  * @clp: state data structure
4984  * @program: RPC program for NFSv4 callback service
4985  * @port: IP port number for NFS4 callback service
4986  * @cred: RPC credential to use for this call
4987  * @res: where to place the result
4988  *
4989  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4990  */
4991 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4992                 unsigned short port, struct rpc_cred *cred,
4993                 struct nfs4_setclientid_res *res)
4994 {
4995         nfs4_verifier sc_verifier;
4996         struct nfs4_setclientid setclientid = {
4997                 .sc_verifier = &sc_verifier,
4998                 .sc_prog = program,
4999                 .sc_cb_ident = clp->cl_cb_ident,
5000         };
5001         struct rpc_message msg = {
5002                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5003                 .rpc_argp = &setclientid,
5004                 .rpc_resp = res,
5005                 .rpc_cred = cred,
5006         };
5007         struct rpc_task *task;
5008         struct rpc_task_setup task_setup_data = {
5009                 .rpc_client = clp->cl_rpcclient,
5010                 .rpc_message = &msg,
5011                 .callback_ops = &nfs4_setclientid_ops,
5012                 .callback_data = &setclientid,
5013                 .flags = RPC_TASK_TIMEOUT,
5014         };
5015         int status;
5016
5017         /* nfs_client_id4 */
5018         nfs4_init_boot_verifier(clp, &sc_verifier);
5019         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5020                 setclientid.sc_name_len =
5021                                 nfs4_init_uniform_client_string(clp,
5022                                                 setclientid.sc_name,
5023                                                 sizeof(setclientid.sc_name));
5024         else
5025                 setclientid.sc_name_len =
5026                                 nfs4_init_nonuniform_client_string(clp,
5027                                                 setclientid.sc_name,
5028                                                 sizeof(setclientid.sc_name));
5029         /* cb_client4 */
5030         setclientid.sc_netid_len =
5031                                 nfs4_init_callback_netid(clp,
5032                                                 setclientid.sc_netid,
5033                                                 sizeof(setclientid.sc_netid));
5034         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5035                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5036                                 clp->cl_ipaddr, port >> 8, port & 255);
5037
5038         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5039                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5040                 setclientid.sc_name_len, setclientid.sc_name);
5041         task = rpc_run_task(&task_setup_data);
5042         if (IS_ERR(task)) {
5043                 status = PTR_ERR(task);
5044                 goto out;
5045         }
5046         status = task->tk_status;
5047         if (setclientid.sc_cred) {
5048                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5049                 put_rpccred(setclientid.sc_cred);
5050         }
5051         rpc_put_task(task);
5052 out:
5053         trace_nfs4_setclientid(clp, status);
5054         dprintk("NFS reply setclientid: %d\n", status);
5055         return status;
5056 }
5057
5058 /**
5059  * nfs4_proc_setclientid_confirm - Confirm client ID
5060  * @clp: state data structure
5061  * @res: result of a previous SETCLIENTID
5062  * @cred: RPC credential to use for this call
5063  *
5064  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5065  */
5066 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5067                 struct nfs4_setclientid_res *arg,
5068                 struct rpc_cred *cred)
5069 {
5070         struct rpc_message msg = {
5071                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5072                 .rpc_argp = arg,
5073                 .rpc_cred = cred,
5074         };
5075         int status;
5076
5077         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5078                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5079                 clp->cl_clientid);
5080         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5081         trace_nfs4_setclientid_confirm(clp, status);
5082         dprintk("NFS reply setclientid_confirm: %d\n", status);
5083         return status;
5084 }
5085
5086 struct nfs4_delegreturndata {
5087         struct nfs4_delegreturnargs args;
5088         struct nfs4_delegreturnres res;
5089         struct nfs_fh fh;
5090         nfs4_stateid stateid;
5091         unsigned long timestamp;
5092         struct nfs_fattr fattr;
5093         int rpc_status;
5094         struct inode *inode;
5095         bool roc;
5096         u32 roc_barrier;
5097 };
5098
5099 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5100 {
5101         struct nfs4_delegreturndata *data = calldata;
5102
5103         if (!nfs4_sequence_done(task, &data->res.seq_res))
5104                 return;
5105
5106         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5107         switch (task->tk_status) {
5108         case 0:
5109                 renew_lease(data->res.server, data->timestamp);
5110         case -NFS4ERR_ADMIN_REVOKED:
5111         case -NFS4ERR_DELEG_REVOKED:
5112         case -NFS4ERR_BAD_STATEID:
5113         case -NFS4ERR_OLD_STATEID:
5114         case -NFS4ERR_STALE_STATEID:
5115         case -NFS4ERR_EXPIRED:
5116                 task->tk_status = 0;
5117                 if (data->roc)
5118                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5119                 break;
5120         default:
5121                 if (nfs4_async_handle_error(task, data->res.server,
5122                                             NULL, NULL) == -EAGAIN) {
5123                         rpc_restart_call_prepare(task);
5124                         return;
5125                 }
5126         }
5127         data->rpc_status = task->tk_status;
5128 }
5129
5130 static void nfs4_delegreturn_release(void *calldata)
5131 {
5132         struct nfs4_delegreturndata *data = calldata;
5133
5134         if (data->roc)
5135                 pnfs_roc_release(data->inode);
5136         kfree(calldata);
5137 }
5138
5139 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5140 {
5141         struct nfs4_delegreturndata *d_data;
5142
5143         d_data = (struct nfs4_delegreturndata *)data;
5144
5145         if (d_data->roc &&
5146             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5147                 return;
5148
5149         nfs4_setup_sequence(d_data->res.server,
5150                         &d_data->args.seq_args,
5151                         &d_data->res.seq_res,
5152                         task);
5153 }
5154
5155 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5156         .rpc_call_prepare = nfs4_delegreturn_prepare,
5157         .rpc_call_done = nfs4_delegreturn_done,
5158         .rpc_release = nfs4_delegreturn_release,
5159 };
5160
5161 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5162 {
5163         struct nfs4_delegreturndata *data;
5164         struct nfs_server *server = NFS_SERVER(inode);
5165         struct rpc_task *task;
5166         struct rpc_message msg = {
5167                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5168                 .rpc_cred = cred,
5169         };
5170         struct rpc_task_setup task_setup_data = {
5171                 .rpc_client = server->client,
5172                 .rpc_message = &msg,
5173                 .callback_ops = &nfs4_delegreturn_ops,
5174                 .flags = RPC_TASK_ASYNC,
5175         };
5176         int status = 0;
5177
5178         data = kzalloc(sizeof(*data), GFP_NOFS);
5179         if (data == NULL)
5180                 return -ENOMEM;
5181         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5182         data->args.fhandle = &data->fh;
5183         data->args.stateid = &data->stateid;
5184         data->args.bitmask = server->cache_consistency_bitmask;
5185         nfs_copy_fh(&data->fh, NFS_FH(inode));
5186         nfs4_stateid_copy(&data->stateid, stateid);
5187         data->res.fattr = &data->fattr;
5188         data->res.server = server;
5189         nfs_fattr_init(data->res.fattr);
5190         data->timestamp = jiffies;
5191         data->rpc_status = 0;
5192         data->inode = inode;
5193         data->roc = list_empty(&NFS_I(inode)->open_files) ?
5194                     pnfs_roc(inode) : false;
5195
5196         task_setup_data.callback_data = data;
5197         msg.rpc_argp = &data->args;
5198         msg.rpc_resp = &data->res;
5199         task = rpc_run_task(&task_setup_data);
5200         if (IS_ERR(task))
5201                 return PTR_ERR(task);
5202         if (!issync)
5203                 goto out;
5204         status = nfs4_wait_for_completion_rpc_task(task);
5205         if (status != 0)
5206                 goto out;
5207         status = data->rpc_status;
5208         if (status == 0)
5209                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5210         else
5211                 nfs_refresh_inode(inode, &data->fattr);
5212 out:
5213         rpc_put_task(task);
5214         return status;
5215 }
5216
5217 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5218 {
5219         struct nfs_server *server = NFS_SERVER(inode);
5220         struct nfs4_exception exception = { };
5221         int err;
5222         do {
5223                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5224                 trace_nfs4_delegreturn(inode, err);
5225                 switch (err) {
5226                         case -NFS4ERR_STALE_STATEID:
5227                         case -NFS4ERR_EXPIRED:
5228                         case 0:
5229                                 return 0;
5230                 }
5231                 err = nfs4_handle_exception(server, err, &exception);
5232         } while (exception.retry);
5233         return err;
5234 }
5235
5236 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5237 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5238
5239 /*
5240  * sleep, with exponential backoff, and retry the LOCK operation.
5241  */
5242 static unsigned long
5243 nfs4_set_lock_task_retry(unsigned long timeout)
5244 {
5245         freezable_schedule_timeout_killable_unsafe(timeout);
5246         timeout <<= 1;
5247         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5248                 return NFS4_LOCK_MAXTIMEOUT;
5249         return timeout;
5250 }
5251
5252 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5253 {
5254         struct inode *inode = state->inode;
5255         struct nfs_server *server = NFS_SERVER(inode);
5256         struct nfs_client *clp = server->nfs_client;
5257         struct nfs_lockt_args arg = {
5258                 .fh = NFS_FH(inode),
5259                 .fl = request,
5260         };
5261         struct nfs_lockt_res res = {
5262                 .denied = request,
5263         };
5264         struct rpc_message msg = {
5265                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5266                 .rpc_argp       = &arg,
5267                 .rpc_resp       = &res,
5268                 .rpc_cred       = state->owner->so_cred,
5269         };
5270         struct nfs4_lock_state *lsp;
5271         int status;
5272
5273         arg.lock_owner.clientid = clp->cl_clientid;
5274         status = nfs4_set_lock_state(state, request);
5275         if (status != 0)
5276                 goto out;
5277         lsp = request->fl_u.nfs4_fl.owner;
5278         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5279         arg.lock_owner.s_dev = server->s_dev;
5280         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5281         switch (status) {
5282                 case 0:
5283                         request->fl_type = F_UNLCK;
5284                         break;
5285                 case -NFS4ERR_DENIED:
5286                         status = 0;
5287         }
5288         request->fl_ops->fl_release_private(request);
5289         request->fl_ops = NULL;
5290 out:
5291         return status;
5292 }
5293
5294 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5295 {
5296         struct nfs4_exception exception = { };
5297         int err;
5298
5299         do {
5300                 err = _nfs4_proc_getlk(state, cmd, request);
5301                 trace_nfs4_get_lock(request, state, cmd, err);
5302                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5303                                 &exception);
5304         } while (exception.retry);
5305         return err;
5306 }
5307
5308 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5309 {
5310         int res = 0;
5311         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5312                 case FL_POSIX:
5313                         res = posix_lock_file_wait(file, fl);
5314                         break;
5315                 case FL_FLOCK:
5316                         res = flock_lock_file_wait(file, fl);
5317                         break;
5318                 default:
5319                         BUG();
5320         }
5321         return res;
5322 }
5323
5324 struct nfs4_unlockdata {
5325         struct nfs_locku_args arg;
5326         struct nfs_locku_res res;
5327         struct nfs4_lock_state *lsp;
5328         struct nfs_open_context *ctx;
5329         struct file_lock fl;
5330         const struct nfs_server *server;
5331         unsigned long timestamp;
5332 };
5333
5334 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5335                 struct nfs_open_context *ctx,
5336                 struct nfs4_lock_state *lsp,
5337                 struct nfs_seqid *seqid)
5338 {
5339         struct nfs4_unlockdata *p;
5340         struct inode *inode = lsp->ls_state->inode;
5341
5342         p = kzalloc(sizeof(*p), GFP_NOFS);
5343         if (p == NULL)
5344                 return NULL;
5345         p->arg.fh = NFS_FH(inode);
5346         p->arg.fl = &p->fl;
5347         p->arg.seqid = seqid;
5348         p->res.seqid = seqid;
5349         p->arg.stateid = &lsp->ls_stateid;
5350         p->lsp = lsp;
5351         atomic_inc(&lsp->ls_count);
5352         /* Ensure we don't close file until we're done freeing locks! */
5353         p->ctx = get_nfs_open_context(ctx);
5354         memcpy(&p->fl, fl, sizeof(p->fl));
5355         p->server = NFS_SERVER(inode);
5356         return p;
5357 }
5358
5359 static void nfs4_locku_release_calldata(void *data)
5360 {
5361         struct nfs4_unlockdata *calldata = data;
5362         nfs_free_seqid(calldata->arg.seqid);
5363         nfs4_put_lock_state(calldata->lsp);
5364         put_nfs_open_context(calldata->ctx);
5365         kfree(calldata);
5366 }
5367
5368 static void nfs4_locku_done(struct rpc_task *task, void *data)
5369 {
5370         struct nfs4_unlockdata *calldata = data;
5371
5372         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5373                 return;
5374         switch (task->tk_status) {
5375                 case 0:
5376                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5377                                         &calldata->res.stateid);
5378                         renew_lease(calldata->server, calldata->timestamp);
5379                         break;
5380                 case -NFS4ERR_BAD_STATEID:
5381                 case -NFS4ERR_OLD_STATEID:
5382                 case -NFS4ERR_STALE_STATEID:
5383                 case -NFS4ERR_EXPIRED:
5384                         break;
5385                 default:
5386                         if (nfs4_async_handle_error(task, calldata->server,
5387                                                     NULL, NULL) == -EAGAIN)
5388                                 rpc_restart_call_prepare(task);
5389         }
5390         nfs_release_seqid(calldata->arg.seqid);
5391 }
5392
5393 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5394 {
5395         struct nfs4_unlockdata *calldata = data;
5396
5397         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5398                 goto out_wait;
5399         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5400                 /* Note: exit _without_ running nfs4_locku_done */
5401                 goto out_no_action;
5402         }
5403         calldata->timestamp = jiffies;
5404         if (nfs4_setup_sequence(calldata->server,
5405                                 &calldata->arg.seq_args,
5406                                 &calldata->res.seq_res,
5407                                 task) != 0)
5408                 nfs_release_seqid(calldata->arg.seqid);
5409         return;
5410 out_no_action:
5411         task->tk_action = NULL;
5412 out_wait:
5413         nfs4_sequence_done(task, &calldata->res.seq_res);
5414 }
5415
5416 static const struct rpc_call_ops nfs4_locku_ops = {
5417         .rpc_call_prepare = nfs4_locku_prepare,
5418         .rpc_call_done = nfs4_locku_done,
5419         .rpc_release = nfs4_locku_release_calldata,
5420 };
5421
5422 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5423                 struct nfs_open_context *ctx,
5424                 struct nfs4_lock_state *lsp,
5425                 struct nfs_seqid *seqid)
5426 {
5427         struct nfs4_unlockdata *data;
5428         struct rpc_message msg = {
5429                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5430                 .rpc_cred = ctx->cred,
5431         };
5432         struct rpc_task_setup task_setup_data = {
5433                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5434                 .rpc_message = &msg,
5435                 .callback_ops = &nfs4_locku_ops,
5436                 .workqueue = nfsiod_workqueue,
5437                 .flags = RPC_TASK_ASYNC,
5438         };
5439
5440         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5441                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5442
5443         /* Ensure this is an unlock - when canceling a lock, the
5444          * canceled lock is passed in, and it won't be an unlock.
5445          */
5446         fl->fl_type = F_UNLCK;
5447
5448         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5449         if (data == NULL) {
5450                 nfs_free_seqid(seqid);
5451                 return ERR_PTR(-ENOMEM);
5452         }
5453
5454         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5455         msg.rpc_argp = &data->arg;
5456         msg.rpc_resp = &data->res;
5457         task_setup_data.callback_data = data;
5458         return rpc_run_task(&task_setup_data);
5459 }
5460
5461 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5462 {
5463         struct inode *inode = state->inode;
5464         struct nfs4_state_owner *sp = state->owner;
5465         struct nfs_inode *nfsi = NFS_I(inode);
5466         struct nfs_seqid *seqid;
5467         struct nfs4_lock_state *lsp;
5468         struct rpc_task *task;
5469         int status = 0;
5470         unsigned char fl_flags = request->fl_flags;
5471
5472         status = nfs4_set_lock_state(state, request);
5473         /* Unlock _before_ we do the RPC call */
5474         request->fl_flags |= FL_EXISTS;
5475         /* Exclude nfs_delegation_claim_locks() */
5476         mutex_lock(&sp->so_delegreturn_mutex);
5477         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5478         down_read(&nfsi->rwsem);
5479         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5480                 up_read(&nfsi->rwsem);
5481                 mutex_unlock(&sp->so_delegreturn_mutex);
5482                 goto out;
5483         }
5484         up_read(&nfsi->rwsem);
5485         mutex_unlock(&sp->so_delegreturn_mutex);
5486         if (status != 0)
5487                 goto out;
5488         /* Is this a delegated lock? */
5489         lsp = request->fl_u.nfs4_fl.owner;
5490         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5491                 goto out;
5492         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5493         status = -ENOMEM;
5494         if (seqid == NULL)
5495                 goto out;
5496         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5497         status = PTR_ERR(task);
5498         if (IS_ERR(task))
5499                 goto out;
5500         status = nfs4_wait_for_completion_rpc_task(task);
5501         rpc_put_task(task);
5502 out:
5503         request->fl_flags = fl_flags;
5504         trace_nfs4_unlock(request, state, F_SETLK, status);
5505         return status;
5506 }
5507
5508 struct nfs4_lockdata {
5509         struct nfs_lock_args arg;
5510         struct nfs_lock_res res;
5511         struct nfs4_lock_state *lsp;
5512         struct nfs_open_context *ctx;
5513         struct file_lock fl;
5514         unsigned long timestamp;
5515         int rpc_status;
5516         int cancelled;
5517         struct nfs_server *server;
5518 };
5519
5520 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5521                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5522                 gfp_t gfp_mask)
5523 {
5524         struct nfs4_lockdata *p;
5525         struct inode *inode = lsp->ls_state->inode;
5526         struct nfs_server *server = NFS_SERVER(inode);
5527
5528         p = kzalloc(sizeof(*p), gfp_mask);
5529         if (p == NULL)
5530                 return NULL;
5531
5532         p->arg.fh = NFS_FH(inode);
5533         p->arg.fl = &p->fl;
5534         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5535         if (p->arg.open_seqid == NULL)
5536                 goto out_free;
5537         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5538         if (p->arg.lock_seqid == NULL)
5539                 goto out_free_seqid;
5540         p->arg.lock_stateid = &lsp->ls_stateid;
5541         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5542         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5543         p->arg.lock_owner.s_dev = server->s_dev;
5544         p->res.lock_seqid = p->arg.lock_seqid;
5545         p->lsp = lsp;
5546         p->server = server;
5547         atomic_inc(&lsp->ls_count);
5548         p->ctx = get_nfs_open_context(ctx);
5549         memcpy(&p->fl, fl, sizeof(p->fl));
5550         return p;
5551 out_free_seqid:
5552         nfs_free_seqid(p->arg.open_seqid);
5553 out_free:
5554         kfree(p);
5555         return NULL;
5556 }
5557
5558 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5559 {
5560         struct nfs4_lockdata *data = calldata;
5561         struct nfs4_state *state = data->lsp->ls_state;
5562
5563         dprintk("%s: begin!\n", __func__);
5564         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5565                 goto out_wait;
5566         /* Do we need to do an open_to_lock_owner? */
5567         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5568                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5569                         goto out_release_lock_seqid;
5570                 }
5571                 data->arg.open_stateid = &state->open_stateid;
5572                 data->arg.new_lock_owner = 1;
5573                 data->res.open_seqid = data->arg.open_seqid;
5574         } else
5575                 data->arg.new_lock_owner = 0;
5576         if (!nfs4_valid_open_stateid(state)) {
5577                 data->rpc_status = -EBADF;
5578                 task->tk_action = NULL;
5579                 goto out_release_open_seqid;
5580         }
5581         data->timestamp = jiffies;
5582         if (nfs4_setup_sequence(data->server,
5583                                 &data->arg.seq_args,
5584                                 &data->res.seq_res,
5585                                 task) == 0)
5586                 return;
5587 out_release_open_seqid:
5588         nfs_release_seqid(data->arg.open_seqid);
5589 out_release_lock_seqid:
5590         nfs_release_seqid(data->arg.lock_seqid);
5591 out_wait:
5592         nfs4_sequence_done(task, &data->res.seq_res);
5593         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5594 }
5595
5596 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5597 {
5598         struct nfs4_lockdata *data = calldata;
5599
5600         dprintk("%s: begin!\n", __func__);
5601
5602         if (!nfs4_sequence_done(task, &data->res.seq_res))
5603                 return;
5604
5605         data->rpc_status = task->tk_status;
5606         if (data->arg.new_lock_owner != 0) {
5607                 if (data->rpc_status == 0)
5608                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5609                 else
5610                         goto out;
5611         }
5612         if (data->rpc_status == 0) {
5613                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5614                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5615                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5616         }
5617 out:
5618         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5619 }
5620
5621 static void nfs4_lock_release(void *calldata)
5622 {
5623         struct nfs4_lockdata *data = calldata;
5624
5625         dprintk("%s: begin!\n", __func__);
5626         nfs_free_seqid(data->arg.open_seqid);
5627         if (data->cancelled != 0) {
5628                 struct rpc_task *task;
5629                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5630                                 data->arg.lock_seqid);
5631                 if (!IS_ERR(task))
5632                         rpc_put_task_async(task);
5633                 dprintk("%s: cancelling lock!\n", __func__);
5634         } else
5635                 nfs_free_seqid(data->arg.lock_seqid);
5636         nfs4_put_lock_state(data->lsp);
5637         put_nfs_open_context(data->ctx);
5638         kfree(data);
5639         dprintk("%s: done!\n", __func__);
5640 }
5641
5642 static const struct rpc_call_ops nfs4_lock_ops = {
5643         .rpc_call_prepare = nfs4_lock_prepare,
5644         .rpc_call_done = nfs4_lock_done,
5645         .rpc_release = nfs4_lock_release,
5646 };
5647
5648 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5649 {
5650         switch (error) {
5651         case -NFS4ERR_ADMIN_REVOKED:
5652         case -NFS4ERR_BAD_STATEID:
5653                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5654                 if (new_lock_owner != 0 ||
5655                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5656                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5657                 break;
5658         case -NFS4ERR_STALE_STATEID:
5659                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5660         case -NFS4ERR_EXPIRED:
5661                 nfs4_schedule_lease_recovery(server->nfs_client);
5662         };
5663 }
5664
5665 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5666 {
5667         struct nfs4_lockdata *data;
5668         struct rpc_task *task;
5669         struct rpc_message msg = {
5670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5671                 .rpc_cred = state->owner->so_cred,
5672         };
5673         struct rpc_task_setup task_setup_data = {
5674                 .rpc_client = NFS_CLIENT(state->inode),
5675                 .rpc_message = &msg,
5676                 .callback_ops = &nfs4_lock_ops,
5677                 .workqueue = nfsiod_workqueue,
5678                 .flags = RPC_TASK_ASYNC,
5679         };
5680         int ret;
5681
5682         dprintk("%s: begin!\n", __func__);
5683         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5684                         fl->fl_u.nfs4_fl.owner,
5685                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5686         if (data == NULL)
5687                 return -ENOMEM;
5688         if (IS_SETLKW(cmd))
5689                 data->arg.block = 1;
5690         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5691         msg.rpc_argp = &data->arg;
5692         msg.rpc_resp = &data->res;
5693         task_setup_data.callback_data = data;
5694         if (recovery_type > NFS_LOCK_NEW) {
5695                 if (recovery_type == NFS_LOCK_RECLAIM)
5696                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5697                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5698         }
5699         task = rpc_run_task(&task_setup_data);
5700         if (IS_ERR(task))
5701                 return PTR_ERR(task);
5702         ret = nfs4_wait_for_completion_rpc_task(task);
5703         if (ret == 0) {
5704                 ret = data->rpc_status;
5705                 if (ret)
5706                         nfs4_handle_setlk_error(data->server, data->lsp,
5707                                         data->arg.new_lock_owner, ret);
5708         } else
5709                 data->cancelled = 1;
5710         rpc_put_task(task);
5711         dprintk("%s: done, ret = %d!\n", __func__, ret);
5712         return ret;
5713 }
5714
5715 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5716 {
5717         struct nfs_server *server = NFS_SERVER(state->inode);
5718         struct nfs4_exception exception = {
5719                 .inode = state->inode,
5720         };
5721         int err;
5722
5723         do {
5724                 /* Cache the lock if possible... */
5725                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5726                         return 0;
5727                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5728                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5729                 if (err != -NFS4ERR_DELAY)
5730                         break;
5731                 nfs4_handle_exception(server, err, &exception);
5732         } while (exception.retry);
5733         return err;
5734 }
5735
5736 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5737 {
5738         struct nfs_server *server = NFS_SERVER(state->inode);
5739         struct nfs4_exception exception = {
5740                 .inode = state->inode,
5741         };
5742         int err;
5743
5744         err = nfs4_set_lock_state(state, request);
5745         if (err != 0)
5746                 return err;
5747         if (!recover_lost_locks) {
5748                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5749                 return 0;
5750         }
5751         do {
5752                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5753                         return 0;
5754                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5755                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5756                 switch (err) {
5757                 default:
5758                         goto out;
5759                 case -NFS4ERR_GRACE:
5760                 case -NFS4ERR_DELAY:
5761                         nfs4_handle_exception(server, err, &exception);
5762                         err = 0;
5763                 }
5764         } while (exception.retry);
5765 out:
5766         return err;
5767 }
5768
5769 #if defined(CONFIG_NFS_V4_1)
5770 /**
5771  * nfs41_check_expired_locks - possibly free a lock stateid
5772  *
5773  * @state: NFSv4 state for an inode
5774  *
5775  * Returns NFS_OK if recovery for this stateid is now finished.
5776  * Otherwise a negative NFS4ERR value is returned.
5777  */
5778 static int nfs41_check_expired_locks(struct nfs4_state *state)
5779 {
5780         int status, ret = -NFS4ERR_BAD_STATEID;
5781         struct nfs4_lock_state *lsp;
5782         struct nfs_server *server = NFS_SERVER(state->inode);
5783
5784         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5785                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5786                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5787
5788                         status = nfs41_test_stateid(server,
5789                                         &lsp->ls_stateid,
5790                                         cred);
5791                         trace_nfs4_test_lock_stateid(state, lsp, status);
5792                         if (status != NFS_OK) {
5793                                 /* Free the stateid unless the server
5794                                  * informs us the stateid is unrecognized. */
5795                                 if (status != -NFS4ERR_BAD_STATEID)
5796                                         nfs41_free_stateid(server,
5797                                                         &lsp->ls_stateid,
5798                                                         cred);
5799                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5800                                 ret = status;
5801                         }
5802                 }
5803         };
5804
5805         return ret;
5806 }
5807
5808 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5809 {
5810         int status = NFS_OK;
5811
5812         if (test_bit(LK_STATE_IN_USE, &state->flags))
5813                 status = nfs41_check_expired_locks(state);
5814         if (status != NFS_OK)
5815                 status = nfs4_lock_expired(state, request);
5816         return status;
5817 }
5818 #endif
5819
5820 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5821 {
5822         struct nfs4_state_owner *sp = state->owner;
5823         struct nfs_inode *nfsi = NFS_I(state->inode);
5824         unsigned char fl_flags = request->fl_flags;
5825         unsigned int seq;
5826         int status = -ENOLCK;
5827
5828         if ((fl_flags & FL_POSIX) &&
5829                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5830                 goto out;
5831         /* Is this a delegated open? */
5832         status = nfs4_set_lock_state(state, request);
5833         if (status != 0)
5834                 goto out;
5835         request->fl_flags |= FL_ACCESS;
5836         status = do_vfs_lock(request->fl_file, request);
5837         if (status < 0)
5838                 goto out;
5839         down_read(&nfsi->rwsem);
5840         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5841                 /* Yes: cache locks! */
5842                 /* ...but avoid races with delegation recall... */
5843                 request->fl_flags = fl_flags & ~FL_SLEEP;
5844                 status = do_vfs_lock(request->fl_file, request);
5845                 goto out_unlock;
5846         }
5847         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5848         up_read(&nfsi->rwsem);
5849         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5850         if (status != 0)
5851                 goto out;
5852         down_read(&nfsi->rwsem);
5853         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5854                 status = -NFS4ERR_DELAY;
5855                 goto out_unlock;
5856         }
5857         /* Note: we always want to sleep here! */
5858         request->fl_flags = fl_flags | FL_SLEEP;
5859         if (do_vfs_lock(request->fl_file, request) < 0)
5860                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5861                         "manager!\n", __func__);
5862 out_unlock:
5863         up_read(&nfsi->rwsem);
5864 out:
5865         request->fl_flags = fl_flags;
5866         return status;
5867 }
5868
5869 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5870 {
5871         struct nfs4_exception exception = {
5872                 .state = state,
5873                 .inode = state->inode,
5874         };
5875         int err;
5876
5877         do {
5878                 err = _nfs4_proc_setlk(state, cmd, request);
5879                 trace_nfs4_set_lock(request, state, cmd, err);
5880                 if (err == -NFS4ERR_DENIED)
5881                         err = -EAGAIN;
5882                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5883                                 err, &exception);
5884         } while (exception.retry);
5885         return err;
5886 }
5887
5888 static int
5889 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5890 {
5891         struct nfs_open_context *ctx;
5892         struct nfs4_state *state;
5893         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5894         int status;
5895
5896         /* verify open state */
5897         ctx = nfs_file_open_context(filp);
5898         state = ctx->state;
5899
5900         if (request->fl_start < 0 || request->fl_end < 0)
5901                 return -EINVAL;
5902
5903         if (IS_GETLK(cmd)) {
5904                 if (state != NULL)
5905                         return nfs4_proc_getlk(state, F_GETLK, request);
5906                 return 0;
5907         }
5908
5909         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5910                 return -EINVAL;
5911
5912         if (request->fl_type == F_UNLCK) {
5913                 if (state != NULL)
5914                         return nfs4_proc_unlck(state, cmd, request);
5915                 return 0;
5916         }
5917
5918         if (state == NULL)
5919                 return -ENOLCK;
5920         /*
5921          * Don't rely on the VFS having checked the file open mode,
5922          * since it won't do this for flock() locks.
5923          */
5924         switch (request->fl_type) {
5925         case F_RDLCK:
5926                 if (!(filp->f_mode & FMODE_READ))
5927                         return -EBADF;
5928                 break;
5929         case F_WRLCK:
5930                 if (!(filp->f_mode & FMODE_WRITE))
5931                         return -EBADF;
5932         }
5933
5934         do {
5935                 status = nfs4_proc_setlk(state, cmd, request);
5936                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5937                         break;
5938                 timeout = nfs4_set_lock_task_retry(timeout);
5939                 status = -ERESTARTSYS;
5940                 if (signalled())
5941                         break;
5942         } while(status < 0);
5943         return status;
5944 }
5945
5946 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5947 {
5948         struct nfs_server *server = NFS_SERVER(state->inode);
5949         int err;
5950
5951         err = nfs4_set_lock_state(state, fl);
5952         if (err != 0)
5953                 return err;
5954         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5955         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5956 }
5957
5958 struct nfs_release_lockowner_data {
5959         struct nfs4_lock_state *lsp;
5960         struct nfs_server *server;
5961         struct nfs_release_lockowner_args args;
5962         struct nfs_release_lockowner_res res;
5963         unsigned long timestamp;
5964 };
5965
5966 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5967 {
5968         struct nfs_release_lockowner_data *data = calldata;
5969         struct nfs_server *server = data->server;
5970         nfs40_setup_sequence(server, &data->args.seq_args,
5971                                 &data->res.seq_res, task);
5972         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5973         data->timestamp = jiffies;
5974 }
5975
5976 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5977 {
5978         struct nfs_release_lockowner_data *data = calldata;
5979         struct nfs_server *server = data->server;
5980
5981         nfs40_sequence_done(task, &data->res.seq_res);
5982
5983         switch (task->tk_status) {
5984         case 0:
5985                 renew_lease(server, data->timestamp);
5986                 break;
5987         case -NFS4ERR_STALE_CLIENTID:
5988         case -NFS4ERR_EXPIRED:
5989                 nfs4_schedule_lease_recovery(server->nfs_client);
5990                 break;
5991         case -NFS4ERR_LEASE_MOVED:
5992         case -NFS4ERR_DELAY:
5993                 if (nfs4_async_handle_error(task, server,
5994                                             NULL, NULL) == -EAGAIN)
5995                         rpc_restart_call_prepare(task);
5996         }
5997 }
5998
5999 static void nfs4_release_lockowner_release(void *calldata)
6000 {
6001         struct nfs_release_lockowner_data *data = calldata;
6002         nfs4_free_lock_state(data->server, data->lsp);
6003         kfree(calldata);
6004 }
6005
6006 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6007         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6008         .rpc_call_done = nfs4_release_lockowner_done,
6009         .rpc_release = nfs4_release_lockowner_release,
6010 };
6011
6012 static void
6013 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6014 {
6015         struct nfs_release_lockowner_data *data;
6016         struct rpc_message msg = {
6017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6018         };
6019
6020         if (server->nfs_client->cl_mvops->minor_version != 0)
6021                 return;
6022
6023         data = kmalloc(sizeof(*data), GFP_NOFS);
6024         if (!data)
6025                 return;
6026         data->lsp = lsp;
6027         data->server = server;
6028         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6029         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6030         data->args.lock_owner.s_dev = server->s_dev;
6031
6032         msg.rpc_argp = &data->args;
6033         msg.rpc_resp = &data->res;
6034         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6035         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6036 }
6037
6038 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6039
6040 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6041                                    const void *buf, size_t buflen,
6042                                    int flags, int type)
6043 {
6044         if (strcmp(key, "") != 0)
6045                 return -EINVAL;
6046
6047         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6048 }
6049
6050 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6051                                    void *buf, size_t buflen, int type)
6052 {
6053         if (strcmp(key, "") != 0)
6054                 return -EINVAL;
6055
6056         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6057 }
6058
6059 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6060                                        size_t list_len, const char *name,
6061                                        size_t name_len, int type)
6062 {
6063         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6064
6065         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6066                 return 0;
6067
6068         if (list && len <= list_len)
6069                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6070         return len;
6071 }
6072
6073 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6074 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6075 {
6076         return server->caps & NFS_CAP_SECURITY_LABEL;
6077 }
6078
6079 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6080                                    const void *buf, size_t buflen,
6081                                    int flags, int type)
6082 {
6083         if (security_ismaclabel(key))
6084                 return nfs4_set_security_label(dentry, buf, buflen);
6085
6086         return -EOPNOTSUPP;
6087 }
6088
6089 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6090                                    void *buf, size_t buflen, int type)
6091 {
6092         if (security_ismaclabel(key))
6093                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6094         return -EOPNOTSUPP;
6095 }
6096
6097 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6098                                        size_t list_len, const char *name,
6099                                        size_t name_len, int type)
6100 {
6101         size_t len = 0;
6102
6103         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6104                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6105                 if (list && len <= list_len)
6106                         security_inode_listsecurity(dentry->d_inode, list, len);
6107         }
6108         return len;
6109 }
6110
6111 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6112         .prefix = XATTR_SECURITY_PREFIX,
6113         .list   = nfs4_xattr_list_nfs4_label,
6114         .get    = nfs4_xattr_get_nfs4_label,
6115         .set    = nfs4_xattr_set_nfs4_label,
6116 };
6117 #endif
6118
6119
6120 /*
6121  * nfs_fhget will use either the mounted_on_fileid or the fileid
6122  */
6123 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6124 {
6125         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6126                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6127               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6128               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6129                 return;
6130
6131         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6132                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6133         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6134         fattr->nlink = 2;
6135 }
6136
6137 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6138                                    const struct qstr *name,
6139                                    struct nfs4_fs_locations *fs_locations,
6140                                    struct page *page)
6141 {
6142         struct nfs_server *server = NFS_SERVER(dir);
6143         u32 bitmask[3] = {
6144                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6145         };
6146         struct nfs4_fs_locations_arg args = {
6147                 .dir_fh = NFS_FH(dir),
6148                 .name = name,
6149                 .page = page,
6150                 .bitmask = bitmask,
6151         };
6152         struct nfs4_fs_locations_res res = {
6153                 .fs_locations = fs_locations,
6154         };
6155         struct rpc_message msg = {
6156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6157                 .rpc_argp = &args,
6158                 .rpc_resp = &res,
6159         };
6160         int status;
6161
6162         dprintk("%s: start\n", __func__);
6163
6164         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6165          * is not supported */
6166         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6167                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6168         else
6169                 bitmask[0] |= FATTR4_WORD0_FILEID;
6170
6171         nfs_fattr_init(&fs_locations->fattr);
6172         fs_locations->server = server;
6173         fs_locations->nlocations = 0;
6174         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6175         dprintk("%s: returned status = %d\n", __func__, status);
6176         return status;
6177 }
6178
6179 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6180                            const struct qstr *name,
6181                            struct nfs4_fs_locations *fs_locations,
6182                            struct page *page)
6183 {
6184         struct nfs4_exception exception = { };
6185         int err;
6186         do {
6187                 err = _nfs4_proc_fs_locations(client, dir, name,
6188                                 fs_locations, page);
6189                 trace_nfs4_get_fs_locations(dir, name, err);
6190                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6191                                 &exception);
6192         } while (exception.retry);
6193         return err;
6194 }
6195
6196 /*
6197  * This operation also signals the server that this client is
6198  * performing migration recovery.  The server can stop returning
6199  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6200  * appended to this compound to identify the client ID which is
6201  * performing recovery.
6202  */
6203 static int _nfs40_proc_get_locations(struct inode *inode,
6204                                      struct nfs4_fs_locations *locations,
6205                                      struct page *page, struct rpc_cred *cred)
6206 {
6207         struct nfs_server *server = NFS_SERVER(inode);
6208         struct rpc_clnt *clnt = server->client;
6209         u32 bitmask[2] = {
6210                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6211         };
6212         struct nfs4_fs_locations_arg args = {
6213                 .clientid       = server->nfs_client->cl_clientid,
6214                 .fh             = NFS_FH(inode),
6215                 .page           = page,
6216                 .bitmask        = bitmask,
6217                 .migration      = 1,            /* skip LOOKUP */
6218                 .renew          = 1,            /* append RENEW */
6219         };
6220         struct nfs4_fs_locations_res res = {
6221                 .fs_locations   = locations,
6222                 .migration      = 1,
6223                 .renew          = 1,
6224         };
6225         struct rpc_message msg = {
6226                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6227                 .rpc_argp       = &args,
6228                 .rpc_resp       = &res,
6229                 .rpc_cred       = cred,
6230         };
6231         unsigned long now = jiffies;
6232         int status;
6233
6234         nfs_fattr_init(&locations->fattr);
6235         locations->server = server;
6236         locations->nlocations = 0;
6237
6238         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6239         nfs4_set_sequence_privileged(&args.seq_args);
6240         status = nfs4_call_sync_sequence(clnt, server, &msg,
6241                                         &args.seq_args, &res.seq_res);
6242         if (status)
6243                 return status;
6244
6245         renew_lease(server, now);
6246         return 0;
6247 }
6248
6249 #ifdef CONFIG_NFS_V4_1
6250
6251 /*
6252  * This operation also signals the server that this client is
6253  * performing migration recovery.  The server can stop asserting
6254  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6255  * performing this operation is identified in the SEQUENCE
6256  * operation in this compound.
6257  *
6258  * When the client supports GETATTR(fs_locations_info), it can
6259  * be plumbed in here.
6260  */
6261 static int _nfs41_proc_get_locations(struct inode *inode,
6262                                      struct nfs4_fs_locations *locations,
6263                                      struct page *page, struct rpc_cred *cred)
6264 {
6265         struct nfs_server *server = NFS_SERVER(inode);
6266         struct rpc_clnt *clnt = server->client;
6267         u32 bitmask[2] = {
6268                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6269         };
6270         struct nfs4_fs_locations_arg args = {
6271                 .fh             = NFS_FH(inode),
6272                 .page           = page,
6273                 .bitmask        = bitmask,
6274                 .migration      = 1,            /* skip LOOKUP */
6275         };
6276         struct nfs4_fs_locations_res res = {
6277                 .fs_locations   = locations,
6278                 .migration      = 1,
6279         };
6280         struct rpc_message msg = {
6281                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6282                 .rpc_argp       = &args,
6283                 .rpc_resp       = &res,
6284                 .rpc_cred       = cred,
6285         };
6286         int status;
6287
6288         nfs_fattr_init(&locations->fattr);
6289         locations->server = server;
6290         locations->nlocations = 0;
6291
6292         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6293         nfs4_set_sequence_privileged(&args.seq_args);
6294         status = nfs4_call_sync_sequence(clnt, server, &msg,
6295                                         &args.seq_args, &res.seq_res);
6296         if (status == NFS4_OK &&
6297             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6298                 status = -NFS4ERR_LEASE_MOVED;
6299         return status;
6300 }
6301
6302 #endif  /* CONFIG_NFS_V4_1 */
6303
6304 /**
6305  * nfs4_proc_get_locations - discover locations for a migrated FSID
6306  * @inode: inode on FSID that is migrating
6307  * @locations: result of query
6308  * @page: buffer
6309  * @cred: credential to use for this operation
6310  *
6311  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6312  * operation failed, or a negative errno if a local error occurred.
6313  *
6314  * On success, "locations" is filled in, but if the server has
6315  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6316  * asserted.
6317  *
6318  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6319  * from this client that require migration recovery.
6320  */
6321 int nfs4_proc_get_locations(struct inode *inode,
6322                             struct nfs4_fs_locations *locations,
6323                             struct page *page, struct rpc_cred *cred)
6324 {
6325         struct nfs_server *server = NFS_SERVER(inode);
6326         struct nfs_client *clp = server->nfs_client;
6327         const struct nfs4_mig_recovery_ops *ops =
6328                                         clp->cl_mvops->mig_recovery_ops;
6329         struct nfs4_exception exception = { };
6330         int status;
6331
6332         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6333                 (unsigned long long)server->fsid.major,
6334                 (unsigned long long)server->fsid.minor,
6335                 clp->cl_hostname);
6336         nfs_display_fhandle(NFS_FH(inode), __func__);
6337
6338         do {
6339                 status = ops->get_locations(inode, locations, page, cred);
6340                 if (status != -NFS4ERR_DELAY)
6341                         break;
6342                 nfs4_handle_exception(server, status, &exception);
6343         } while (exception.retry);
6344         return status;
6345 }
6346
6347 /*
6348  * This operation also signals the server that this client is
6349  * performing "lease moved" recovery.  The server can stop
6350  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6351  * is appended to this compound to identify the client ID which is
6352  * performing recovery.
6353  */
6354 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6355 {
6356         struct nfs_server *server = NFS_SERVER(inode);
6357         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6358         struct rpc_clnt *clnt = server->client;
6359         struct nfs4_fsid_present_arg args = {
6360                 .fh             = NFS_FH(inode),
6361                 .clientid       = clp->cl_clientid,
6362                 .renew          = 1,            /* append RENEW */
6363         };
6364         struct nfs4_fsid_present_res res = {
6365                 .renew          = 1,
6366         };
6367         struct rpc_message msg = {
6368                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6369                 .rpc_argp       = &args,
6370                 .rpc_resp       = &res,
6371                 .rpc_cred       = cred,
6372         };
6373         unsigned long now = jiffies;
6374         int status;
6375
6376         res.fh = nfs_alloc_fhandle();
6377         if (res.fh == NULL)
6378                 return -ENOMEM;
6379
6380         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6381         nfs4_set_sequence_privileged(&args.seq_args);
6382         status = nfs4_call_sync_sequence(clnt, server, &msg,
6383                                                 &args.seq_args, &res.seq_res);
6384         nfs_free_fhandle(res.fh);
6385         if (status)
6386                 return status;
6387
6388         do_renew_lease(clp, now);
6389         return 0;
6390 }
6391
6392 #ifdef CONFIG_NFS_V4_1
6393
6394 /*
6395  * This operation also signals the server that this client is
6396  * performing "lease moved" recovery.  The server can stop asserting
6397  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6398  * this operation is identified in the SEQUENCE operation in this
6399  * compound.
6400  */
6401 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6402 {
6403         struct nfs_server *server = NFS_SERVER(inode);
6404         struct rpc_clnt *clnt = server->client;
6405         struct nfs4_fsid_present_arg args = {
6406                 .fh             = NFS_FH(inode),
6407         };
6408         struct nfs4_fsid_present_res res = {
6409         };
6410         struct rpc_message msg = {
6411                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6412                 .rpc_argp       = &args,
6413                 .rpc_resp       = &res,
6414                 .rpc_cred       = cred,
6415         };
6416         int status;
6417
6418         res.fh = nfs_alloc_fhandle();
6419         if (res.fh == NULL)
6420                 return -ENOMEM;
6421
6422         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6423         nfs4_set_sequence_privileged(&args.seq_args);
6424         status = nfs4_call_sync_sequence(clnt, server, &msg,
6425                                                 &args.seq_args, &res.seq_res);
6426         nfs_free_fhandle(res.fh);
6427         if (status == NFS4_OK &&
6428             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6429                 status = -NFS4ERR_LEASE_MOVED;
6430         return status;
6431 }
6432
6433 #endif  /* CONFIG_NFS_V4_1 */
6434
6435 /**
6436  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6437  * @inode: inode on FSID to check
6438  * @cred: credential to use for this operation
6439  *
6440  * Server indicates whether the FSID is present, moved, or not
6441  * recognized.  This operation is necessary to clear a LEASE_MOVED
6442  * condition for this client ID.
6443  *
6444  * Returns NFS4_OK if the FSID is present on this server,
6445  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6446  *  NFS4ERR code if some error occurred on the server, or a
6447  *  negative errno if a local failure occurred.
6448  */
6449 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6450 {
6451         struct nfs_server *server = NFS_SERVER(inode);
6452         struct nfs_client *clp = server->nfs_client;
6453         const struct nfs4_mig_recovery_ops *ops =
6454                                         clp->cl_mvops->mig_recovery_ops;
6455         struct nfs4_exception exception = { };
6456         int status;
6457
6458         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6459                 (unsigned long long)server->fsid.major,
6460                 (unsigned long long)server->fsid.minor,
6461                 clp->cl_hostname);
6462         nfs_display_fhandle(NFS_FH(inode), __func__);
6463
6464         do {
6465                 status = ops->fsid_present(inode, cred);
6466                 if (status != -NFS4ERR_DELAY)
6467                         break;
6468                 nfs4_handle_exception(server, status, &exception);
6469         } while (exception.retry);
6470         return status;
6471 }
6472
6473 /**
6474  * If 'use_integrity' is true and the state managment nfs_client
6475  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6476  * and the machine credential as per RFC3530bis and RFC5661 Security
6477  * Considerations sections. Otherwise, just use the user cred with the
6478  * filesystem's rpc_client.
6479  */
6480 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6481 {
6482         int status;
6483         struct nfs4_secinfo_arg args = {
6484                 .dir_fh = NFS_FH(dir),
6485                 .name   = name,
6486         };
6487         struct nfs4_secinfo_res res = {
6488                 .flavors     = flavors,
6489         };
6490         struct rpc_message msg = {
6491                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6492                 .rpc_argp = &args,
6493                 .rpc_resp = &res,
6494         };
6495         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6496         struct rpc_cred *cred = NULL;
6497
6498         if (use_integrity) {
6499                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6500                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6501                 msg.rpc_cred = cred;
6502         }
6503
6504         dprintk("NFS call  secinfo %s\n", name->name);
6505
6506         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6507                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6508
6509         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6510                                 &res.seq_res, 0);
6511         dprintk("NFS reply  secinfo: %d\n", status);
6512
6513         if (cred)
6514                 put_rpccred(cred);
6515
6516         return status;
6517 }
6518
6519 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6520                       struct nfs4_secinfo_flavors *flavors)
6521 {
6522         struct nfs4_exception exception = { };
6523         int err;
6524         do {
6525                 err = -NFS4ERR_WRONGSEC;
6526
6527                 /* try to use integrity protection with machine cred */
6528                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6529                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6530
6531                 /*
6532                  * if unable to use integrity protection, or SECINFO with
6533                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6534                  * disallowed by spec, but exists in deployed servers) use
6535                  * the current filesystem's rpc_client and the user cred.
6536                  */
6537                 if (err == -NFS4ERR_WRONGSEC)
6538                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6539
6540                 trace_nfs4_secinfo(dir, name, err);
6541                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6542                                 &exception);
6543         } while (exception.retry);
6544         return err;
6545 }
6546
6547 #ifdef CONFIG_NFS_V4_1
6548 /*
6549  * Check the exchange flags returned by the server for invalid flags, having
6550  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6551  * DS flags set.
6552  */
6553 static int nfs4_check_cl_exchange_flags(u32 flags)
6554 {
6555         if (flags & ~EXCHGID4_FLAG_MASK_R)
6556                 goto out_inval;
6557         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6558             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6559                 goto out_inval;
6560         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6561                 goto out_inval;
6562         return NFS_OK;
6563 out_inval:
6564         return -NFS4ERR_INVAL;
6565 }
6566
6567 static bool
6568 nfs41_same_server_scope(struct nfs41_server_scope *a,
6569                         struct nfs41_server_scope *b)
6570 {
6571         if (a->server_scope_sz == b->server_scope_sz &&
6572             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6573                 return true;
6574
6575         return false;
6576 }
6577
6578 /*
6579  * nfs4_proc_bind_conn_to_session()
6580  *
6581  * The 4.1 client currently uses the same TCP connection for the
6582  * fore and backchannel.
6583  */
6584 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6585 {
6586         int status;
6587         struct nfs41_bind_conn_to_session_res res;
6588         struct rpc_message msg = {
6589                 .rpc_proc =
6590                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6591                 .rpc_argp = clp,
6592                 .rpc_resp = &res,
6593                 .rpc_cred = cred,
6594         };
6595
6596         dprintk("--> %s\n", __func__);
6597
6598         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6599         if (unlikely(res.session == NULL)) {
6600                 status = -ENOMEM;
6601                 goto out;
6602         }
6603
6604         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6605         trace_nfs4_bind_conn_to_session(clp, status);
6606         if (status == 0) {
6607                 if (memcmp(res.session->sess_id.data,
6608                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6609                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6610                         status = -EIO;
6611                         goto out_session;
6612                 }
6613                 if (res.dir != NFS4_CDFS4_BOTH) {
6614                         dprintk("NFS: %s: Unexpected direction from server\n",
6615                                 __func__);
6616                         status = -EIO;
6617                         goto out_session;
6618                 }
6619                 if (res.use_conn_in_rdma_mode) {
6620                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6621                                 __func__);
6622                         status = -EIO;
6623                         goto out_session;
6624                 }
6625         }
6626 out_session:
6627         kfree(res.session);
6628 out:
6629         dprintk("<-- %s status= %d\n", __func__, status);
6630         return status;
6631 }
6632
6633 /*
6634  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6635  * and operations we'd like to see to enable certain features in the allow map
6636  */
6637 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6638         .how = SP4_MACH_CRED,
6639         .enforce.u.words = {
6640                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6641                       1 << (OP_EXCHANGE_ID - 32) |
6642                       1 << (OP_CREATE_SESSION - 32) |
6643                       1 << (OP_DESTROY_SESSION - 32) |
6644                       1 << (OP_DESTROY_CLIENTID - 32)
6645         },
6646         .allow.u.words = {
6647                 [0] = 1 << (OP_CLOSE) |
6648                       1 << (OP_LOCKU) |
6649                       1 << (OP_COMMIT),
6650                 [1] = 1 << (OP_SECINFO - 32) |
6651                       1 << (OP_SECINFO_NO_NAME - 32) |
6652                       1 << (OP_TEST_STATEID - 32) |
6653                       1 << (OP_FREE_STATEID - 32) |
6654                       1 << (OP_WRITE - 32)
6655         }
6656 };
6657
6658 /*
6659  * Select the state protection mode for client `clp' given the server results
6660  * from exchange_id in `sp'.
6661  *
6662  * Returns 0 on success, negative errno otherwise.
6663  */
6664 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6665                                  struct nfs41_state_protection *sp)
6666 {
6667         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6668                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6669                       1 << (OP_EXCHANGE_ID - 32) |
6670                       1 << (OP_CREATE_SESSION - 32) |
6671                       1 << (OP_DESTROY_SESSION - 32) |
6672                       1 << (OP_DESTROY_CLIENTID - 32)
6673         };
6674         unsigned int i;
6675
6676         if (sp->how == SP4_MACH_CRED) {
6677                 /* Print state protect result */
6678                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6679                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6680                         if (test_bit(i, sp->enforce.u.longs))
6681                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6682                         if (test_bit(i, sp->allow.u.longs))
6683                                 dfprintk(MOUNT, "  allow op %d\n", i);
6684                 }
6685
6686                 /* make sure nothing is on enforce list that isn't supported */
6687                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6688                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6689                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6690                                 return -EINVAL;
6691                         }
6692                 }
6693
6694                 /*
6695                  * Minimal mode - state operations are allowed to use machine
6696                  * credential.  Note this already happens by default, so the
6697                  * client doesn't have to do anything more than the negotiation.
6698                  *
6699                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6700                  *       we're already using the machine cred for exchange_id
6701                  *       and will never use a different cred.
6702                  */
6703                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6704                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6705                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6706                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6707                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6708                         dfprintk(MOUNT, "  minimal mode enabled\n");
6709                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6710                 } else {
6711                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6712                         return -EINVAL;
6713                 }
6714
6715                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6716                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6717                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6718                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6719                 }
6720
6721                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6722                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6723                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6724                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6725                 }
6726
6727                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6728                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6729                         dfprintk(MOUNT, "  stateid mode enabled\n");
6730                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6731                 }
6732
6733                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6734                         dfprintk(MOUNT, "  write mode enabled\n");
6735                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6736                 }
6737
6738                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6739                         dfprintk(MOUNT, "  commit mode enabled\n");
6740                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6741                 }
6742         }
6743
6744         return 0;
6745 }
6746
6747 /*
6748  * _nfs4_proc_exchange_id()
6749  *
6750  * Wrapper for EXCHANGE_ID operation.
6751  */
6752 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6753         u32 sp4_how)
6754 {
6755         nfs4_verifier verifier;
6756         struct nfs41_exchange_id_args args = {
6757                 .verifier = &verifier,
6758                 .client = clp,
6759 #ifdef CONFIG_NFS_V4_1_MIGRATION
6760                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6761                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6762                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6763 #else
6764                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6765                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6766 #endif
6767         };
6768         struct nfs41_exchange_id_res res = {
6769                 0
6770         };
6771         int status;
6772         struct rpc_message msg = {
6773                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6774                 .rpc_argp = &args,
6775                 .rpc_resp = &res,
6776                 .rpc_cred = cred,
6777         };
6778
6779         nfs4_init_boot_verifier(clp, &verifier);
6780         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6781                                                         sizeof(args.id));
6782         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6783                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6784                 args.id_len, args.id);
6785
6786         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6787                                         GFP_NOFS);
6788         if (unlikely(res.server_owner == NULL)) {
6789                 status = -ENOMEM;
6790                 goto out;
6791         }
6792
6793         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6794                                         GFP_NOFS);
6795         if (unlikely(res.server_scope == NULL)) {
6796                 status = -ENOMEM;
6797                 goto out_server_owner;
6798         }
6799
6800         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6801         if (unlikely(res.impl_id == NULL)) {
6802                 status = -ENOMEM;
6803                 goto out_server_scope;
6804         }
6805
6806         switch (sp4_how) {
6807         case SP4_NONE:
6808                 args.state_protect.how = SP4_NONE;
6809                 break;
6810
6811         case SP4_MACH_CRED:
6812                 args.state_protect = nfs4_sp4_mach_cred_request;
6813                 break;
6814
6815         default:
6816                 /* unsupported! */
6817                 WARN_ON_ONCE(1);
6818                 status = -EINVAL;
6819                 goto out_server_scope;
6820         }
6821
6822         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6823         trace_nfs4_exchange_id(clp, status);
6824         if (status == 0)
6825                 status = nfs4_check_cl_exchange_flags(res.flags);
6826
6827         if (status == 0)
6828                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6829
6830         if (status == 0) {
6831                 clp->cl_clientid = res.clientid;
6832                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6833                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6834                         clp->cl_seqid = res.seqid;
6835
6836                 kfree(clp->cl_serverowner);
6837                 clp->cl_serverowner = res.server_owner;
6838                 res.server_owner = NULL;
6839
6840                 /* use the most recent implementation id */
6841                 kfree(clp->cl_implid);
6842                 clp->cl_implid = res.impl_id;
6843
6844                 if (clp->cl_serverscope != NULL &&
6845                     !nfs41_same_server_scope(clp->cl_serverscope,
6846                                              res.server_scope)) {
6847                         dprintk("%s: server_scope mismatch detected\n",
6848                                 __func__);
6849                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6850                         kfree(clp->cl_serverscope);
6851                         clp->cl_serverscope = NULL;
6852                 }
6853
6854                 if (clp->cl_serverscope == NULL) {
6855                         clp->cl_serverscope = res.server_scope;
6856                         goto out;
6857                 }
6858         } else
6859                 kfree(res.impl_id);
6860
6861 out_server_owner:
6862         kfree(res.server_owner);
6863 out_server_scope:
6864         kfree(res.server_scope);
6865 out:
6866         if (clp->cl_implid != NULL)
6867                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6868                         "domain: %s, name: %s, date: %llu,%u\n",
6869                         clp->cl_implid->domain, clp->cl_implid->name,
6870                         clp->cl_implid->date.seconds,
6871                         clp->cl_implid->date.nseconds);
6872         dprintk("NFS reply exchange_id: %d\n", status);
6873         return status;
6874 }
6875
6876 /*
6877  * nfs4_proc_exchange_id()
6878  *
6879  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6880  *
6881  * Since the clientid has expired, all compounds using sessions
6882  * associated with the stale clientid will be returning
6883  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6884  * be in some phase of session reset.
6885  *
6886  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6887  */
6888 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6889 {
6890         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6891         int status;
6892
6893         /* try SP4_MACH_CRED if krb5i/p */
6894         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6895             authflavor == RPC_AUTH_GSS_KRB5P) {
6896                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6897                 if (!status)
6898                         return 0;
6899         }
6900
6901         /* try SP4_NONE */
6902         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6903 }
6904
6905 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6906                 struct rpc_cred *cred)
6907 {
6908         struct rpc_message msg = {
6909                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6910                 .rpc_argp = clp,
6911                 .rpc_cred = cred,
6912         };
6913         int status;
6914
6915         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6916         trace_nfs4_destroy_clientid(clp, status);
6917         if (status)
6918                 dprintk("NFS: Got error %d from the server %s on "
6919                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6920         return status;
6921 }
6922
6923 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6924                 struct rpc_cred *cred)
6925 {
6926         unsigned int loop;
6927         int ret;
6928
6929         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6930                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6931                 switch (ret) {
6932                 case -NFS4ERR_DELAY:
6933                 case -NFS4ERR_CLIENTID_BUSY:
6934                         ssleep(1);
6935                         break;
6936                 default:
6937                         return ret;
6938                 }
6939         }
6940         return 0;
6941 }
6942
6943 int nfs4_destroy_clientid(struct nfs_client *clp)
6944 {
6945         struct rpc_cred *cred;
6946         int ret = 0;
6947
6948         if (clp->cl_mvops->minor_version < 1)
6949                 goto out;
6950         if (clp->cl_exchange_flags == 0)
6951                 goto out;
6952         if (clp->cl_preserve_clid)
6953                 goto out;
6954         cred = nfs4_get_clid_cred(clp);
6955         ret = nfs4_proc_destroy_clientid(clp, cred);
6956         if (cred)
6957                 put_rpccred(cred);
6958         switch (ret) {
6959         case 0:
6960         case -NFS4ERR_STALE_CLIENTID:
6961                 clp->cl_exchange_flags = 0;
6962         }
6963 out:
6964         return ret;
6965 }
6966
6967 struct nfs4_get_lease_time_data {
6968         struct nfs4_get_lease_time_args *args;
6969         struct nfs4_get_lease_time_res *res;
6970         struct nfs_client *clp;
6971 };
6972
6973 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6974                                         void *calldata)
6975 {
6976         struct nfs4_get_lease_time_data *data =
6977                         (struct nfs4_get_lease_time_data *)calldata;
6978
6979         dprintk("--> %s\n", __func__);
6980         /* just setup sequence, do not trigger session recovery
6981            since we're invoked within one */
6982         nfs41_setup_sequence(data->clp->cl_session,
6983                         &data->args->la_seq_args,
6984                         &data->res->lr_seq_res,
6985                         task);
6986         dprintk("<-- %s\n", __func__);
6987 }
6988
6989 /*
6990  * Called from nfs4_state_manager thread for session setup, so don't recover
6991  * from sequence operation or clientid errors.
6992  */
6993 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6994 {
6995         struct nfs4_get_lease_time_data *data =
6996                         (struct nfs4_get_lease_time_data *)calldata;
6997
6998         dprintk("--> %s\n", __func__);
6999         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7000                 return;
7001         switch (task->tk_status) {
7002         case -NFS4ERR_DELAY:
7003         case -NFS4ERR_GRACE:
7004                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7005                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7006                 task->tk_status = 0;
7007                 /* fall through */
7008         case -NFS4ERR_RETRY_UNCACHED_REP:
7009                 rpc_restart_call_prepare(task);
7010                 return;
7011         }
7012         dprintk("<-- %s\n", __func__);
7013 }
7014
7015 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7016         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7017         .rpc_call_done = nfs4_get_lease_time_done,
7018 };
7019
7020 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7021 {
7022         struct rpc_task *task;
7023         struct nfs4_get_lease_time_args args;
7024         struct nfs4_get_lease_time_res res = {
7025                 .lr_fsinfo = fsinfo,
7026         };
7027         struct nfs4_get_lease_time_data data = {
7028                 .args = &args,
7029                 .res = &res,
7030                 .clp = clp,
7031         };
7032         struct rpc_message msg = {
7033                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7034                 .rpc_argp = &args,
7035                 .rpc_resp = &res,
7036         };
7037         struct rpc_task_setup task_setup = {
7038                 .rpc_client = clp->cl_rpcclient,
7039                 .rpc_message = &msg,
7040                 .callback_ops = &nfs4_get_lease_time_ops,
7041                 .callback_data = &data,
7042                 .flags = RPC_TASK_TIMEOUT,
7043         };
7044         int status;
7045
7046         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7047         nfs4_set_sequence_privileged(&args.la_seq_args);
7048         dprintk("--> %s\n", __func__);
7049         task = rpc_run_task(&task_setup);
7050
7051         if (IS_ERR(task))
7052                 status = PTR_ERR(task);
7053         else {
7054                 status = task->tk_status;
7055                 rpc_put_task(task);
7056         }
7057         dprintk("<-- %s return %d\n", __func__, status);
7058
7059         return status;
7060 }
7061
7062 /*
7063  * Initialize the values to be used by the client in CREATE_SESSION
7064  * If nfs4_init_session set the fore channel request and response sizes,
7065  * use them.
7066  *
7067  * Set the back channel max_resp_sz_cached to zero to force the client to
7068  * always set csa_cachethis to FALSE because the current implementation
7069  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7070  */
7071 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7072 {
7073         unsigned int max_rqst_sz, max_resp_sz;
7074
7075         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7076         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7077
7078         /* Fore channel attributes */
7079         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7080         args->fc_attrs.max_resp_sz = max_resp_sz;
7081         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7082         args->fc_attrs.max_reqs = max_session_slots;
7083
7084         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7085                 "max_ops=%u max_reqs=%u\n",
7086                 __func__,
7087                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7088                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7089
7090         /* Back channel attributes */
7091         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7092         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7093         args->bc_attrs.max_resp_sz_cached = 0;
7094         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7095         args->bc_attrs.max_reqs = 1;
7096
7097         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7098                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7099                 __func__,
7100                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7101                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7102                 args->bc_attrs.max_reqs);
7103 }
7104
7105 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7106 {
7107         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7108         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7109
7110         if (rcvd->max_resp_sz > sent->max_resp_sz)
7111                 return -EINVAL;
7112         /*
7113          * Our requested max_ops is the minimum we need; we're not
7114          * prepared to break up compounds into smaller pieces than that.
7115          * So, no point even trying to continue if the server won't
7116          * cooperate:
7117          */
7118         if (rcvd->max_ops < sent->max_ops)
7119                 return -EINVAL;
7120         if (rcvd->max_reqs == 0)
7121                 return -EINVAL;
7122         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7123                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7124         return 0;
7125 }
7126
7127 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7128 {
7129         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7130         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7131
7132         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7133                 return -EINVAL;
7134         if (rcvd->max_resp_sz < sent->max_resp_sz)
7135                 return -EINVAL;
7136         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7137                 return -EINVAL;
7138         /* These would render the backchannel useless: */
7139         if (rcvd->max_ops != sent->max_ops)
7140                 return -EINVAL;
7141         if (rcvd->max_reqs != sent->max_reqs)
7142                 return -EINVAL;
7143         return 0;
7144 }
7145
7146 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7147                                      struct nfs4_session *session)
7148 {
7149         int ret;
7150
7151         ret = nfs4_verify_fore_channel_attrs(args, session);
7152         if (ret)
7153                 return ret;
7154         return nfs4_verify_back_channel_attrs(args, session);
7155 }
7156
7157 static int _nfs4_proc_create_session(struct nfs_client *clp,
7158                 struct rpc_cred *cred)
7159 {
7160         struct nfs4_session *session = clp->cl_session;
7161         struct nfs41_create_session_args args = {
7162                 .client = clp,
7163                 .cb_program = NFS4_CALLBACK,
7164         };
7165         struct nfs41_create_session_res res = {
7166                 .client = clp,
7167         };
7168         struct rpc_message msg = {
7169                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7170                 .rpc_argp = &args,
7171                 .rpc_resp = &res,
7172                 .rpc_cred = cred,
7173         };
7174         int status;
7175
7176         nfs4_init_channel_attrs(&args);
7177         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7178
7179         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7180         trace_nfs4_create_session(clp, status);
7181
7182         if (!status) {
7183                 /* Verify the session's negotiated channel_attrs values */
7184                 status = nfs4_verify_channel_attrs(&args, session);
7185                 /* Increment the clientid slot sequence id */
7186                 clp->cl_seqid++;
7187         }
7188
7189         return status;
7190 }
7191
7192 /*
7193  * Issues a CREATE_SESSION operation to the server.
7194  * It is the responsibility of the caller to verify the session is
7195  * expired before calling this routine.
7196  */
7197 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7198 {
7199         int status;
7200         unsigned *ptr;
7201         struct nfs4_session *session = clp->cl_session;
7202
7203         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7204
7205         status = _nfs4_proc_create_session(clp, cred);
7206         if (status)
7207                 goto out;
7208
7209         /* Init or reset the session slot tables */
7210         status = nfs4_setup_session_slot_tables(session);
7211         dprintk("slot table setup returned %d\n", status);
7212         if (status)
7213                 goto out;
7214
7215         ptr = (unsigned *)&session->sess_id.data[0];
7216         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7217                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7218 out:
7219         dprintk("<-- %s\n", __func__);
7220         return status;
7221 }
7222
7223 /*
7224  * Issue the over-the-wire RPC DESTROY_SESSION.
7225  * The caller must serialize access to this routine.
7226  */
7227 int nfs4_proc_destroy_session(struct nfs4_session *session,
7228                 struct rpc_cred *cred)
7229 {
7230         struct rpc_message msg = {
7231                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7232                 .rpc_argp = session,
7233                 .rpc_cred = cred,
7234         };
7235         int status = 0;
7236
7237         dprintk("--> nfs4_proc_destroy_session\n");
7238
7239         /* session is still being setup */
7240         if (session->clp->cl_cons_state != NFS_CS_READY)
7241                 return status;
7242
7243         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7244         trace_nfs4_destroy_session(session->clp, status);
7245
7246         if (status)
7247                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7248                         "Session has been destroyed regardless...\n", status);
7249
7250         dprintk("<-- nfs4_proc_destroy_session\n");
7251         return status;
7252 }
7253
7254 /*
7255  * Renew the cl_session lease.
7256  */
7257 struct nfs4_sequence_data {
7258         struct nfs_client *clp;
7259         struct nfs4_sequence_args args;
7260         struct nfs4_sequence_res res;
7261 };
7262
7263 static void nfs41_sequence_release(void *data)
7264 {
7265         struct nfs4_sequence_data *calldata = data;
7266         struct nfs_client *clp = calldata->clp;
7267
7268         if (atomic_read(&clp->cl_count) > 1)
7269                 nfs4_schedule_state_renewal(clp);
7270         nfs_put_client(clp);
7271         kfree(calldata);
7272 }
7273
7274 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7275 {
7276         switch(task->tk_status) {
7277         case -NFS4ERR_DELAY:
7278                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7279                 return -EAGAIN;
7280         default:
7281                 nfs4_schedule_lease_recovery(clp);
7282         }
7283         return 0;
7284 }
7285
7286 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7287 {
7288         struct nfs4_sequence_data *calldata = data;
7289         struct nfs_client *clp = calldata->clp;
7290
7291         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7292                 return;
7293
7294         trace_nfs4_sequence(clp, task->tk_status);
7295         if (task->tk_status < 0) {
7296                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7297                 if (atomic_read(&clp->cl_count) == 1)
7298                         goto out;
7299
7300                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7301                         rpc_restart_call_prepare(task);
7302                         return;
7303                 }
7304         }
7305         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7306 out:
7307         dprintk("<-- %s\n", __func__);
7308 }
7309
7310 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7311 {
7312         struct nfs4_sequence_data *calldata = data;
7313         struct nfs_client *clp = calldata->clp;
7314         struct nfs4_sequence_args *args;
7315         struct nfs4_sequence_res *res;
7316
7317         args = task->tk_msg.rpc_argp;
7318         res = task->tk_msg.rpc_resp;
7319
7320         nfs41_setup_sequence(clp->cl_session, args, res, task);
7321 }
7322
7323 static const struct rpc_call_ops nfs41_sequence_ops = {
7324         .rpc_call_done = nfs41_sequence_call_done,
7325         .rpc_call_prepare = nfs41_sequence_prepare,
7326         .rpc_release = nfs41_sequence_release,
7327 };
7328
7329 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7330                 struct rpc_cred *cred,
7331                 bool is_privileged)
7332 {
7333         struct nfs4_sequence_data *calldata;
7334         struct rpc_message msg = {
7335                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7336                 .rpc_cred = cred,
7337         };
7338         struct rpc_task_setup task_setup_data = {
7339                 .rpc_client = clp->cl_rpcclient,
7340                 .rpc_message = &msg,
7341                 .callback_ops = &nfs41_sequence_ops,
7342                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7343         };
7344
7345         if (!atomic_inc_not_zero(&clp->cl_count))
7346                 return ERR_PTR(-EIO);
7347         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7348         if (calldata == NULL) {
7349                 nfs_put_client(clp);
7350                 return ERR_PTR(-ENOMEM);
7351         }
7352         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7353         if (is_privileged)
7354                 nfs4_set_sequence_privileged(&calldata->args);
7355         msg.rpc_argp = &calldata->args;
7356         msg.rpc_resp = &calldata->res;
7357         calldata->clp = clp;
7358         task_setup_data.callback_data = calldata;
7359
7360         return rpc_run_task(&task_setup_data);
7361 }
7362
7363 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7364 {
7365         struct rpc_task *task;
7366         int ret = 0;
7367
7368         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7369                 return -EAGAIN;
7370         task = _nfs41_proc_sequence(clp, cred, false);
7371         if (IS_ERR(task))
7372                 ret = PTR_ERR(task);
7373         else
7374                 rpc_put_task_async(task);
7375         dprintk("<-- %s status=%d\n", __func__, ret);
7376         return ret;
7377 }
7378
7379 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7380 {
7381         struct rpc_task *task;
7382         int ret;
7383
7384         task = _nfs41_proc_sequence(clp, cred, true);
7385         if (IS_ERR(task)) {
7386                 ret = PTR_ERR(task);
7387                 goto out;
7388         }
7389         ret = rpc_wait_for_completion_task(task);
7390         if (!ret) {
7391                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7392
7393                 if (task->tk_status == 0)
7394                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7395                 ret = task->tk_status;
7396         }
7397         rpc_put_task(task);
7398 out:
7399         dprintk("<-- %s status=%d\n", __func__, ret);
7400         return ret;
7401 }
7402
7403 struct nfs4_reclaim_complete_data {
7404         struct nfs_client *clp;
7405         struct nfs41_reclaim_complete_args arg;
7406         struct nfs41_reclaim_complete_res res;
7407 };
7408
7409 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7410 {
7411         struct nfs4_reclaim_complete_data *calldata = data;
7412
7413         nfs41_setup_sequence(calldata->clp->cl_session,
7414                         &calldata->arg.seq_args,
7415                         &calldata->res.seq_res,
7416                         task);
7417 }
7418
7419 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7420 {
7421         switch(task->tk_status) {
7422         case 0:
7423         case -NFS4ERR_COMPLETE_ALREADY:
7424         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7425                 break;
7426         case -NFS4ERR_DELAY:
7427                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7428                 /* fall through */
7429         case -NFS4ERR_RETRY_UNCACHED_REP:
7430                 return -EAGAIN;
7431         default:
7432                 nfs4_schedule_lease_recovery(clp);
7433         }
7434         return 0;
7435 }
7436
7437 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7438 {
7439         struct nfs4_reclaim_complete_data *calldata = data;
7440         struct nfs_client *clp = calldata->clp;
7441         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7442
7443         dprintk("--> %s\n", __func__);
7444         if (!nfs41_sequence_done(task, res))
7445                 return;
7446
7447         trace_nfs4_reclaim_complete(clp, task->tk_status);
7448         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7449                 rpc_restart_call_prepare(task);
7450                 return;
7451         }
7452         dprintk("<-- %s\n", __func__);
7453 }
7454
7455 static void nfs4_free_reclaim_complete_data(void *data)
7456 {
7457         struct nfs4_reclaim_complete_data *calldata = data;
7458
7459         kfree(calldata);
7460 }
7461
7462 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7463         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7464         .rpc_call_done = nfs4_reclaim_complete_done,
7465         .rpc_release = nfs4_free_reclaim_complete_data,
7466 };
7467
7468 /*
7469  * Issue a global reclaim complete.
7470  */
7471 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7472                 struct rpc_cred *cred)
7473 {
7474         struct nfs4_reclaim_complete_data *calldata;
7475         struct rpc_task *task;
7476         struct rpc_message msg = {
7477                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7478                 .rpc_cred = cred,
7479         };
7480         struct rpc_task_setup task_setup_data = {
7481                 .rpc_client = clp->cl_rpcclient,
7482                 .rpc_message = &msg,
7483                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7484                 .flags = RPC_TASK_ASYNC,
7485         };
7486         int status = -ENOMEM;
7487
7488         dprintk("--> %s\n", __func__);
7489         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7490         if (calldata == NULL)
7491                 goto out;
7492         calldata->clp = clp;
7493         calldata->arg.one_fs = 0;
7494
7495         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7496         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7497         msg.rpc_argp = &calldata->arg;
7498         msg.rpc_resp = &calldata->res;
7499         task_setup_data.callback_data = calldata;
7500         task = rpc_run_task(&task_setup_data);
7501         if (IS_ERR(task)) {
7502                 status = PTR_ERR(task);
7503                 goto out;
7504         }
7505         status = nfs4_wait_for_completion_rpc_task(task);
7506         if (status == 0)
7507                 status = task->tk_status;
7508         rpc_put_task(task);
7509         return 0;
7510 out:
7511         dprintk("<-- %s status=%d\n", __func__, status);
7512         return status;
7513 }
7514
7515 static void
7516 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7517 {
7518         struct nfs4_layoutget *lgp = calldata;
7519         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7520         struct nfs4_session *session = nfs4_get_session(server);
7521
7522         dprintk("--> %s\n", __func__);
7523         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7524          * right now covering the LAYOUTGET we are about to send.
7525          * However, that is not so catastrophic, and there seems
7526          * to be no way to prevent it completely.
7527          */
7528         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7529                                 &lgp->res.seq_res, task))
7530                 return;
7531         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7532                                           NFS_I(lgp->args.inode)->layout,
7533                                           lgp->args.ctx->state)) {
7534                 rpc_exit(task, NFS4_OK);
7535         }
7536 }
7537
7538 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7539 {
7540         struct nfs4_layoutget *lgp = calldata;
7541         struct inode *inode = lgp->args.inode;
7542         struct nfs_server *server = NFS_SERVER(inode);
7543         struct pnfs_layout_hdr *lo;
7544         struct nfs4_state *state = NULL;
7545         unsigned long timeo, now, giveup;
7546
7547         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7548
7549         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7550                 goto out;
7551
7552         switch (task->tk_status) {
7553         case 0:
7554                 goto out;
7555         /*
7556          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7557          * (or clients) writing to the same RAID stripe
7558          */
7559         case -NFS4ERR_LAYOUTTRYLATER:
7560         /*
7561          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7562          * existing layout before getting a new one).
7563          */
7564         case -NFS4ERR_RECALLCONFLICT:
7565                 timeo = rpc_get_timeout(task->tk_client);
7566                 giveup = lgp->args.timestamp + timeo;
7567                 now = jiffies;
7568                 if (time_after(giveup, now)) {
7569                         unsigned long delay;
7570
7571                         /* Delay for:
7572                          * - Not less then NFS4_POLL_RETRY_MIN.
7573                          * - One last time a jiffie before we give up
7574                          * - exponential backoff (time_now minus start_attempt)
7575                          */
7576                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7577                                     min((giveup - now - 1),
7578                                         now - lgp->args.timestamp));
7579
7580                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7581                                 __func__, delay);
7582                         rpc_delay(task, delay);
7583                         task->tk_status = 0;
7584                         rpc_restart_call_prepare(task);
7585                         goto out; /* Do not call nfs4_async_handle_error() */
7586                 }
7587                 break;
7588         case -NFS4ERR_EXPIRED:
7589         case -NFS4ERR_BAD_STATEID:
7590                 spin_lock(&inode->i_lock);
7591                 lo = NFS_I(inode)->layout;
7592                 if (!lo || list_empty(&lo->plh_segs)) {
7593                         spin_unlock(&inode->i_lock);
7594                         /* If the open stateid was bad, then recover it. */
7595                         state = lgp->args.ctx->state;
7596                 } else {
7597                         LIST_HEAD(head);
7598
7599                         /*
7600                          * Mark the bad layout state as invalid, then retry
7601                          * with the current stateid.
7602                          */
7603                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7604                         spin_unlock(&inode->i_lock);
7605                         pnfs_free_lseg_list(&head);
7606
7607                         task->tk_status = 0;
7608                         rpc_restart_call_prepare(task);
7609                 }
7610         }
7611         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7612                 rpc_restart_call_prepare(task);
7613 out:
7614         dprintk("<-- %s\n", __func__);
7615 }
7616
7617 static size_t max_response_pages(struct nfs_server *server)
7618 {
7619         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7620         return nfs_page_array_len(0, max_resp_sz);
7621 }
7622
7623 static void nfs4_free_pages(struct page **pages, size_t size)
7624 {
7625         int i;
7626
7627         if (!pages)
7628                 return;
7629
7630         for (i = 0; i < size; i++) {
7631                 if (!pages[i])
7632                         break;
7633                 __free_page(pages[i]);
7634         }
7635         kfree(pages);
7636 }
7637
7638 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7639 {
7640         struct page **pages;
7641         int i;
7642
7643         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7644         if (!pages) {
7645                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7646                 return NULL;
7647         }
7648
7649         for (i = 0; i < size; i++) {
7650                 pages[i] = alloc_page(gfp_flags);
7651                 if (!pages[i]) {
7652                         dprintk("%s: failed to allocate page\n", __func__);
7653                         nfs4_free_pages(pages, size);
7654                         return NULL;
7655                 }
7656         }
7657
7658         return pages;
7659 }
7660
7661 static void nfs4_layoutget_release(void *calldata)
7662 {
7663         struct nfs4_layoutget *lgp = calldata;
7664         struct inode *inode = lgp->args.inode;
7665         struct nfs_server *server = NFS_SERVER(inode);
7666         size_t max_pages = max_response_pages(server);
7667
7668         dprintk("--> %s\n", __func__);
7669         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7670         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7671         put_nfs_open_context(lgp->args.ctx);
7672         kfree(calldata);
7673         dprintk("<-- %s\n", __func__);
7674 }
7675
7676 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7677         .rpc_call_prepare = nfs4_layoutget_prepare,
7678         .rpc_call_done = nfs4_layoutget_done,
7679         .rpc_release = nfs4_layoutget_release,
7680 };
7681
7682 struct pnfs_layout_segment *
7683 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7684 {
7685         struct inode *inode = lgp->args.inode;
7686         struct nfs_server *server = NFS_SERVER(inode);
7687         size_t max_pages = max_response_pages(server);
7688         struct rpc_task *task;
7689         struct rpc_message msg = {
7690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7691                 .rpc_argp = &lgp->args,
7692                 .rpc_resp = &lgp->res,
7693                 .rpc_cred = lgp->cred,
7694         };
7695         struct rpc_task_setup task_setup_data = {
7696                 .rpc_client = server->client,
7697                 .rpc_message = &msg,
7698                 .callback_ops = &nfs4_layoutget_call_ops,
7699                 .callback_data = lgp,
7700                 .flags = RPC_TASK_ASYNC,
7701         };
7702         struct pnfs_layout_segment *lseg = NULL;
7703         int status = 0;
7704
7705         dprintk("--> %s\n", __func__);
7706
7707         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7708         if (!lgp->args.layout.pages) {
7709                 nfs4_layoutget_release(lgp);
7710                 return ERR_PTR(-ENOMEM);
7711         }
7712         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7713         lgp->args.timestamp = jiffies;
7714
7715         lgp->res.layoutp = &lgp->args.layout;
7716         lgp->res.seq_res.sr_slot = NULL;
7717         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7718
7719         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7720         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7721
7722         task = rpc_run_task(&task_setup_data);
7723         if (IS_ERR(task))
7724                 return ERR_CAST(task);
7725         status = nfs4_wait_for_completion_rpc_task(task);
7726         if (status == 0)
7727                 status = task->tk_status;
7728         trace_nfs4_layoutget(lgp->args.ctx,
7729                         &lgp->args.range,
7730                         &lgp->res.range,
7731                         status);
7732         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7733         if (status == 0 && lgp->res.layoutp->len)
7734                 lseg = pnfs_layout_process(lgp);
7735         rpc_put_task(task);
7736         dprintk("<-- %s status=%d\n", __func__, status);
7737         if (status)
7738                 return ERR_PTR(status);
7739         return lseg;
7740 }
7741
7742 static void
7743 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7744 {
7745         struct nfs4_layoutreturn *lrp = calldata;
7746
7747         dprintk("--> %s\n", __func__);
7748         nfs41_setup_sequence(lrp->clp->cl_session,
7749                         &lrp->args.seq_args,
7750                         &lrp->res.seq_res,
7751                         task);
7752 }
7753
7754 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7755 {
7756         struct nfs4_layoutreturn *lrp = calldata;
7757         struct nfs_server *server;
7758
7759         dprintk("--> %s\n", __func__);
7760
7761         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7762                 return;
7763
7764         server = NFS_SERVER(lrp->args.inode);
7765         switch (task->tk_status) {
7766         default:
7767                 task->tk_status = 0;
7768         case 0:
7769                 break;
7770         case -NFS4ERR_DELAY:
7771                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7772                         break;
7773                 rpc_restart_call_prepare(task);
7774                 return;
7775         }
7776         dprintk("<-- %s\n", __func__);
7777 }
7778
7779 static void nfs4_layoutreturn_release(void *calldata)
7780 {
7781         struct nfs4_layoutreturn *lrp = calldata;
7782         struct pnfs_layout_hdr *lo = lrp->args.layout;
7783
7784         dprintk("--> %s\n", __func__);
7785         spin_lock(&lo->plh_inode->i_lock);
7786         if (lrp->res.lrs_present)
7787                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7788         lo->plh_block_lgets--;
7789         spin_unlock(&lo->plh_inode->i_lock);
7790         pnfs_put_layout_hdr(lrp->args.layout);
7791         kfree(calldata);
7792         dprintk("<-- %s\n", __func__);
7793 }
7794
7795 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7796         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7797         .rpc_call_done = nfs4_layoutreturn_done,
7798         .rpc_release = nfs4_layoutreturn_release,
7799 };
7800
7801 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7802 {
7803         struct rpc_task *task;
7804         struct rpc_message msg = {
7805                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7806                 .rpc_argp = &lrp->args,
7807                 .rpc_resp = &lrp->res,
7808                 .rpc_cred = lrp->cred,
7809         };
7810         struct rpc_task_setup task_setup_data = {
7811                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7812                 .rpc_message = &msg,
7813                 .callback_ops = &nfs4_layoutreturn_call_ops,
7814                 .callback_data = lrp,
7815         };
7816         int status;
7817
7818         dprintk("--> %s\n", __func__);
7819         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7820         task = rpc_run_task(&task_setup_data);
7821         if (IS_ERR(task))
7822                 return PTR_ERR(task);
7823         status = task->tk_status;
7824         trace_nfs4_layoutreturn(lrp->args.inode, status);
7825         dprintk("<-- %s status=%d\n", __func__, status);
7826         rpc_put_task(task);
7827         return status;
7828 }
7829
7830 static int
7831 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7832                 struct pnfs_device *pdev,
7833                 struct rpc_cred *cred)
7834 {
7835         struct nfs4_getdeviceinfo_args args = {
7836                 .pdev = pdev,
7837         };
7838         struct nfs4_getdeviceinfo_res res = {
7839                 .pdev = pdev,
7840         };
7841         struct rpc_message msg = {
7842                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7843                 .rpc_argp = &args,
7844                 .rpc_resp = &res,
7845                 .rpc_cred = cred,
7846         };
7847         int status;
7848
7849         dprintk("--> %s\n", __func__);
7850         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7851         dprintk("<-- %s status=%d\n", __func__, status);
7852
7853         return status;
7854 }
7855
7856 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7857                 struct pnfs_device *pdev,
7858                 struct rpc_cred *cred)
7859 {
7860         struct nfs4_exception exception = { };
7861         int err;
7862
7863         do {
7864                 err = nfs4_handle_exception(server,
7865                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7866                                         &exception);
7867         } while (exception.retry);
7868         return err;
7869 }
7870 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7871
7872 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7873 {
7874         struct nfs4_layoutcommit_data *data = calldata;
7875         struct nfs_server *server = NFS_SERVER(data->args.inode);
7876         struct nfs4_session *session = nfs4_get_session(server);
7877
7878         nfs41_setup_sequence(session,
7879                         &data->args.seq_args,
7880                         &data->res.seq_res,
7881                         task);
7882 }
7883
7884 static void
7885 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7886 {
7887         struct nfs4_layoutcommit_data *data = calldata;
7888         struct nfs_server *server = NFS_SERVER(data->args.inode);
7889
7890         if (!nfs41_sequence_done(task, &data->res.seq_res))
7891                 return;
7892
7893         switch (task->tk_status) { /* Just ignore these failures */
7894         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7895         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7896         case -NFS4ERR_BADLAYOUT:     /* no layout */
7897         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7898                 task->tk_status = 0;
7899         case 0:
7900                 break;
7901         default:
7902                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7903                         rpc_restart_call_prepare(task);
7904                         return;
7905                 }
7906         }
7907 }
7908
7909 static void nfs4_layoutcommit_release(void *calldata)
7910 {
7911         struct nfs4_layoutcommit_data *data = calldata;
7912
7913         pnfs_cleanup_layoutcommit(data);
7914         nfs_post_op_update_inode_force_wcc(data->args.inode,
7915                                            data->res.fattr);
7916         put_rpccred(data->cred);
7917         kfree(data);
7918 }
7919
7920 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7921         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7922         .rpc_call_done = nfs4_layoutcommit_done,
7923         .rpc_release = nfs4_layoutcommit_release,
7924 };
7925
7926 int
7927 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7928 {
7929         struct rpc_message msg = {
7930                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7931                 .rpc_argp = &data->args,
7932                 .rpc_resp = &data->res,
7933                 .rpc_cred = data->cred,
7934         };
7935         struct rpc_task_setup task_setup_data = {
7936                 .task = &data->task,
7937                 .rpc_client = NFS_CLIENT(data->args.inode),
7938                 .rpc_message = &msg,
7939                 .callback_ops = &nfs4_layoutcommit_ops,
7940                 .callback_data = data,
7941                 .flags = RPC_TASK_ASYNC,
7942         };
7943         struct rpc_task *task;
7944         int status = 0;
7945
7946         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7947                 "lbw: %llu inode %lu\n",
7948                 data->task.tk_pid, sync,
7949                 data->args.lastbytewritten,
7950                 data->args.inode->i_ino);
7951
7952         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7953         task = rpc_run_task(&task_setup_data);
7954         if (IS_ERR(task))
7955                 return PTR_ERR(task);
7956         if (sync == false)
7957                 goto out;
7958         status = nfs4_wait_for_completion_rpc_task(task);
7959         if (status != 0)
7960                 goto out;
7961         status = task->tk_status;
7962         trace_nfs4_layoutcommit(data->args.inode, status);
7963 out:
7964         dprintk("%s: status %d\n", __func__, status);
7965         rpc_put_task(task);
7966         return status;
7967 }
7968
7969 /**
7970  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7971  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7972  */
7973 static int
7974 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7975                     struct nfs_fsinfo *info,
7976                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7977 {
7978         struct nfs41_secinfo_no_name_args args = {
7979                 .style = SECINFO_STYLE_CURRENT_FH,
7980         };
7981         struct nfs4_secinfo_res res = {
7982                 .flavors = flavors,
7983         };
7984         struct rpc_message msg = {
7985                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7986                 .rpc_argp = &args,
7987                 .rpc_resp = &res,
7988         };
7989         struct rpc_clnt *clnt = server->client;
7990         struct rpc_cred *cred = NULL;
7991         int status;
7992
7993         if (use_integrity) {
7994                 clnt = server->nfs_client->cl_rpcclient;
7995                 cred = nfs4_get_clid_cred(server->nfs_client);
7996                 msg.rpc_cred = cred;
7997         }
7998
7999         dprintk("--> %s\n", __func__);
8000         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8001                                 &res.seq_res, 0);
8002         dprintk("<-- %s status=%d\n", __func__, status);
8003
8004         if (cred)
8005                 put_rpccred(cred);
8006
8007         return status;
8008 }
8009
8010 static int
8011 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8012                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8013 {
8014         struct nfs4_exception exception = { };
8015         int err;
8016         do {
8017                 /* first try using integrity protection */
8018                 err = -NFS4ERR_WRONGSEC;
8019
8020                 /* try to use integrity protection with machine cred */
8021                 if (_nfs4_is_integrity_protected(server->nfs_client))
8022                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8023                                                           flavors, true);
8024
8025                 /*
8026                  * if unable to use integrity protection, or SECINFO with
8027                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8028                  * disallowed by spec, but exists in deployed servers) use
8029                  * the current filesystem's rpc_client and the user cred.
8030                  */
8031                 if (err == -NFS4ERR_WRONGSEC)
8032                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8033                                                           flavors, false);
8034
8035                 switch (err) {
8036                 case 0:
8037                 case -NFS4ERR_WRONGSEC:
8038                 case -ENOTSUPP:
8039                         goto out;
8040                 default:
8041                         err = nfs4_handle_exception(server, err, &exception);
8042                 }
8043         } while (exception.retry);
8044 out:
8045         return err;
8046 }
8047
8048 static int
8049 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8050                     struct nfs_fsinfo *info)
8051 {
8052         int err;
8053         struct page *page;
8054         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8055         struct nfs4_secinfo_flavors *flavors;
8056         struct nfs4_secinfo4 *secinfo;
8057         int i;
8058
8059         page = alloc_page(GFP_KERNEL);
8060         if (!page) {
8061                 err = -ENOMEM;
8062                 goto out;
8063         }
8064
8065         flavors = page_address(page);
8066         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8067
8068         /*
8069          * Fall back on "guess and check" method if
8070          * the server doesn't support SECINFO_NO_NAME
8071          */
8072         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8073                 err = nfs4_find_root_sec(server, fhandle, info);
8074                 goto out_freepage;
8075         }
8076         if (err)
8077                 goto out_freepage;
8078
8079         for (i = 0; i < flavors->num_flavors; i++) {
8080                 secinfo = &flavors->flavors[i];
8081
8082                 switch (secinfo->flavor) {
8083                 case RPC_AUTH_NULL:
8084                 case RPC_AUTH_UNIX:
8085                 case RPC_AUTH_GSS:
8086                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8087                                         &secinfo->flavor_info);
8088                         break;
8089                 default:
8090                         flavor = RPC_AUTH_MAXFLAVOR;
8091                         break;
8092                 }
8093
8094                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8095                         flavor = RPC_AUTH_MAXFLAVOR;
8096
8097                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8098                         err = nfs4_lookup_root_sec(server, fhandle,
8099                                                    info, flavor);
8100                         if (!err)
8101                                 break;
8102                 }
8103         }
8104
8105         if (flavor == RPC_AUTH_MAXFLAVOR)
8106                 err = -EPERM;
8107
8108 out_freepage:
8109         put_page(page);
8110         if (err == -EACCES)
8111                 return -EPERM;
8112 out:
8113         return err;
8114 }
8115
8116 static int _nfs41_test_stateid(struct nfs_server *server,
8117                 nfs4_stateid *stateid,
8118                 struct rpc_cred *cred)
8119 {
8120         int status;
8121         struct nfs41_test_stateid_args args = {
8122                 .stateid = stateid,
8123         };
8124         struct nfs41_test_stateid_res res;
8125         struct rpc_message msg = {
8126                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8127                 .rpc_argp = &args,
8128                 .rpc_resp = &res,
8129                 .rpc_cred = cred,
8130         };
8131         struct rpc_clnt *rpc_client = server->client;
8132
8133         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8134                 &rpc_client, &msg);
8135
8136         dprintk("NFS call  test_stateid %p\n", stateid);
8137         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8138         nfs4_set_sequence_privileged(&args.seq_args);
8139         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8140                         &args.seq_args, &res.seq_res);
8141         if (status != NFS_OK) {
8142                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8143                 return status;
8144         }
8145         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8146         return -res.status;
8147 }
8148
8149 /**
8150  * nfs41_test_stateid - perform a TEST_STATEID operation
8151  *
8152  * @server: server / transport on which to perform the operation
8153  * @stateid: state ID to test
8154  * @cred: credential
8155  *
8156  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8157  * Otherwise a negative NFS4ERR value is returned if the operation
8158  * failed or the state ID is not currently valid.
8159  */
8160 static int nfs41_test_stateid(struct nfs_server *server,
8161                 nfs4_stateid *stateid,
8162                 struct rpc_cred *cred)
8163 {
8164         struct nfs4_exception exception = { };
8165         int err;
8166         do {
8167                 err = _nfs41_test_stateid(server, stateid, cred);
8168                 if (err != -NFS4ERR_DELAY)
8169                         break;
8170                 nfs4_handle_exception(server, err, &exception);
8171         } while (exception.retry);
8172         return err;
8173 }
8174
8175 struct nfs_free_stateid_data {
8176         struct nfs_server *server;
8177         struct nfs41_free_stateid_args args;
8178         struct nfs41_free_stateid_res res;
8179 };
8180
8181 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8182 {
8183         struct nfs_free_stateid_data *data = calldata;
8184         nfs41_setup_sequence(nfs4_get_session(data->server),
8185                         &data->args.seq_args,
8186                         &data->res.seq_res,
8187                         task);
8188 }
8189
8190 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8191 {
8192         struct nfs_free_stateid_data *data = calldata;
8193
8194         nfs41_sequence_done(task, &data->res.seq_res);
8195
8196         switch (task->tk_status) {
8197         case -NFS4ERR_DELAY:
8198                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8199                         rpc_restart_call_prepare(task);
8200         }
8201 }
8202
8203 static void nfs41_free_stateid_release(void *calldata)
8204 {
8205         kfree(calldata);
8206 }
8207
8208 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8209         .rpc_call_prepare = nfs41_free_stateid_prepare,
8210         .rpc_call_done = nfs41_free_stateid_done,
8211         .rpc_release = nfs41_free_stateid_release,
8212 };
8213
8214 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8215                 nfs4_stateid *stateid,
8216                 struct rpc_cred *cred,
8217                 bool privileged)
8218 {
8219         struct rpc_message msg = {
8220                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8221                 .rpc_cred = cred,
8222         };
8223         struct rpc_task_setup task_setup = {
8224                 .rpc_client = server->client,
8225                 .rpc_message = &msg,
8226                 .callback_ops = &nfs41_free_stateid_ops,
8227                 .flags = RPC_TASK_ASYNC,
8228         };
8229         struct nfs_free_stateid_data *data;
8230
8231         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8232                 &task_setup.rpc_client, &msg);
8233
8234         dprintk("NFS call  free_stateid %p\n", stateid);
8235         data = kmalloc(sizeof(*data), GFP_NOFS);
8236         if (!data)
8237                 return ERR_PTR(-ENOMEM);
8238         data->server = server;
8239         nfs4_stateid_copy(&data->args.stateid, stateid);
8240
8241         task_setup.callback_data = data;
8242
8243         msg.rpc_argp = &data->args;
8244         msg.rpc_resp = &data->res;
8245         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8246         if (privileged)
8247                 nfs4_set_sequence_privileged(&data->args.seq_args);
8248
8249         return rpc_run_task(&task_setup);
8250 }
8251
8252 /**
8253  * nfs41_free_stateid - perform a FREE_STATEID operation
8254  *
8255  * @server: server / transport on which to perform the operation
8256  * @stateid: state ID to release
8257  * @cred: credential
8258  *
8259  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8260  * negative NFS4ERR value is returned.
8261  */
8262 static int nfs41_free_stateid(struct nfs_server *server,
8263                 nfs4_stateid *stateid,
8264                 struct rpc_cred *cred)
8265 {
8266         struct rpc_task *task;
8267         int ret;
8268
8269         task = _nfs41_free_stateid(server, stateid, cred, true);
8270         if (IS_ERR(task))
8271                 return PTR_ERR(task);
8272         ret = rpc_wait_for_completion_task(task);
8273         if (!ret)
8274                 ret = task->tk_status;
8275         rpc_put_task(task);
8276         return ret;
8277 }
8278
8279 static void
8280 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8281 {
8282         struct rpc_task *task;
8283         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8284
8285         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8286         nfs4_free_lock_state(server, lsp);
8287         if (IS_ERR(task))
8288                 return;
8289         rpc_put_task(task);
8290 }
8291
8292 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8293                 const nfs4_stateid *s2)
8294 {
8295         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8296                 return false;
8297
8298         if (s1->seqid == s2->seqid)
8299                 return true;
8300         if (s1->seqid == 0 || s2->seqid == 0)
8301                 return true;
8302
8303         return false;
8304 }
8305
8306 #endif /* CONFIG_NFS_V4_1 */
8307
8308 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8309                 const nfs4_stateid *s2)
8310 {
8311         return nfs4_stateid_match(s1, s2);
8312 }
8313
8314
8315 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8316         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8317         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8318         .recover_open   = nfs4_open_reclaim,
8319         .recover_lock   = nfs4_lock_reclaim,
8320         .establish_clid = nfs4_init_clientid,
8321         .detect_trunking = nfs40_discover_server_trunking,
8322 };
8323
8324 #if defined(CONFIG_NFS_V4_1)
8325 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8326         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8327         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8328         .recover_open   = nfs4_open_reclaim,
8329         .recover_lock   = nfs4_lock_reclaim,
8330         .establish_clid = nfs41_init_clientid,
8331         .reclaim_complete = nfs41_proc_reclaim_complete,
8332         .detect_trunking = nfs41_discover_server_trunking,
8333 };
8334 #endif /* CONFIG_NFS_V4_1 */
8335
8336 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8337         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8338         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8339         .recover_open   = nfs40_open_expired,
8340         .recover_lock   = nfs4_lock_expired,
8341         .establish_clid = nfs4_init_clientid,
8342 };
8343
8344 #if defined(CONFIG_NFS_V4_1)
8345 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8346         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8347         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8348         .recover_open   = nfs41_open_expired,
8349         .recover_lock   = nfs41_lock_expired,
8350         .establish_clid = nfs41_init_clientid,
8351 };
8352 #endif /* CONFIG_NFS_V4_1 */
8353
8354 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8355         .sched_state_renewal = nfs4_proc_async_renew,
8356         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8357         .renew_lease = nfs4_proc_renew,
8358 };
8359
8360 #if defined(CONFIG_NFS_V4_1)
8361 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8362         .sched_state_renewal = nfs41_proc_async_sequence,
8363         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8364         .renew_lease = nfs4_proc_sequence,
8365 };
8366 #endif
8367
8368 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8369         .get_locations = _nfs40_proc_get_locations,
8370         .fsid_present = _nfs40_proc_fsid_present,
8371 };
8372
8373 #if defined(CONFIG_NFS_V4_1)
8374 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8375         .get_locations = _nfs41_proc_get_locations,
8376         .fsid_present = _nfs41_proc_fsid_present,
8377 };
8378 #endif  /* CONFIG_NFS_V4_1 */
8379
8380 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8381         .minor_version = 0,
8382         .init_caps = NFS_CAP_READDIRPLUS
8383                 | NFS_CAP_ATOMIC_OPEN
8384                 | NFS_CAP_CHANGE_ATTR
8385                 | NFS_CAP_POSIX_LOCK,
8386         .init_client = nfs40_init_client,
8387         .shutdown_client = nfs40_shutdown_client,
8388         .match_stateid = nfs4_match_stateid,
8389         .find_root_sec = nfs4_find_root_sec,
8390         .free_lock_state = nfs4_release_lockowner,
8391         .call_sync_ops = &nfs40_call_sync_ops,
8392         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8393         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8394         .state_renewal_ops = &nfs40_state_renewal_ops,
8395         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8396 };
8397
8398 #if defined(CONFIG_NFS_V4_1)
8399 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8400         .minor_version = 1,
8401         .init_caps = NFS_CAP_READDIRPLUS
8402                 | NFS_CAP_ATOMIC_OPEN
8403                 | NFS_CAP_CHANGE_ATTR
8404                 | NFS_CAP_POSIX_LOCK
8405                 | NFS_CAP_STATEID_NFSV41
8406                 | NFS_CAP_ATOMIC_OPEN_V1,
8407         .init_client = nfs41_init_client,
8408         .shutdown_client = nfs41_shutdown_client,
8409         .match_stateid = nfs41_match_stateid,
8410         .find_root_sec = nfs41_find_root_sec,
8411         .free_lock_state = nfs41_free_lock_state,
8412         .call_sync_ops = &nfs41_call_sync_ops,
8413         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8414         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8415         .state_renewal_ops = &nfs41_state_renewal_ops,
8416         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8417 };
8418 #endif
8419
8420 #if defined(CONFIG_NFS_V4_2)
8421 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8422         .minor_version = 2,
8423         .init_caps = NFS_CAP_READDIRPLUS
8424                 | NFS_CAP_ATOMIC_OPEN
8425                 | NFS_CAP_CHANGE_ATTR
8426                 | NFS_CAP_POSIX_LOCK
8427                 | NFS_CAP_STATEID_NFSV41
8428                 | NFS_CAP_ATOMIC_OPEN_V1
8429                 | NFS_CAP_SEEK,
8430         .init_client = nfs41_init_client,
8431         .shutdown_client = nfs41_shutdown_client,
8432         .match_stateid = nfs41_match_stateid,
8433         .find_root_sec = nfs41_find_root_sec,
8434         .free_lock_state = nfs41_free_lock_state,
8435         .call_sync_ops = &nfs41_call_sync_ops,
8436         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8437         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8438         .state_renewal_ops = &nfs41_state_renewal_ops,
8439 };
8440 #endif
8441
8442 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8443         [0] = &nfs_v4_0_minor_ops,
8444 #if defined(CONFIG_NFS_V4_1)
8445         [1] = &nfs_v4_1_minor_ops,
8446 #endif
8447 #if defined(CONFIG_NFS_V4_2)
8448         [2] = &nfs_v4_2_minor_ops,
8449 #endif
8450 };
8451
8452 static const struct inode_operations nfs4_dir_inode_operations = {
8453         .create         = nfs_create,
8454         .lookup         = nfs_lookup,
8455         .atomic_open    = nfs_atomic_open,
8456         .link           = nfs_link,
8457         .unlink         = nfs_unlink,
8458         .symlink        = nfs_symlink,
8459         .mkdir          = nfs_mkdir,
8460         .rmdir          = nfs_rmdir,
8461         .mknod          = nfs_mknod,
8462         .rename         = nfs_rename,
8463         .permission     = nfs_permission,
8464         .getattr        = nfs_getattr,
8465         .setattr        = nfs_setattr,
8466         .getxattr       = generic_getxattr,
8467         .setxattr       = generic_setxattr,
8468         .listxattr      = generic_listxattr,
8469         .removexattr    = generic_removexattr,
8470 };
8471
8472 static const struct inode_operations nfs4_file_inode_operations = {
8473         .permission     = nfs_permission,
8474         .getattr        = nfs_getattr,
8475         .setattr        = nfs_setattr,
8476         .getxattr       = generic_getxattr,
8477         .setxattr       = generic_setxattr,
8478         .listxattr      = generic_listxattr,
8479         .removexattr    = generic_removexattr,
8480 };
8481
8482 const struct nfs_rpc_ops nfs_v4_clientops = {
8483         .version        = 4,                    /* protocol version */
8484         .dentry_ops     = &nfs4_dentry_operations,
8485         .dir_inode_ops  = &nfs4_dir_inode_operations,
8486         .file_inode_ops = &nfs4_file_inode_operations,
8487         .file_ops       = &nfs4_file_operations,
8488         .getroot        = nfs4_proc_get_root,
8489         .submount       = nfs4_submount,
8490         .try_mount      = nfs4_try_mount,
8491         .getattr        = nfs4_proc_getattr,
8492         .setattr        = nfs4_proc_setattr,
8493         .lookup         = nfs4_proc_lookup,
8494         .access         = nfs4_proc_access,
8495         .readlink       = nfs4_proc_readlink,
8496         .create         = nfs4_proc_create,
8497         .remove         = nfs4_proc_remove,
8498         .unlink_setup   = nfs4_proc_unlink_setup,
8499         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8500         .unlink_done    = nfs4_proc_unlink_done,
8501         .rename_setup   = nfs4_proc_rename_setup,
8502         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8503         .rename_done    = nfs4_proc_rename_done,
8504         .link           = nfs4_proc_link,
8505         .symlink        = nfs4_proc_symlink,
8506         .mkdir          = nfs4_proc_mkdir,
8507         .rmdir          = nfs4_proc_remove,
8508         .readdir        = nfs4_proc_readdir,
8509         .mknod          = nfs4_proc_mknod,
8510         .statfs         = nfs4_proc_statfs,
8511         .fsinfo         = nfs4_proc_fsinfo,
8512         .pathconf       = nfs4_proc_pathconf,
8513         .set_capabilities = nfs4_server_capabilities,
8514         .decode_dirent  = nfs4_decode_dirent,
8515         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8516         .read_setup     = nfs4_proc_read_setup,
8517         .read_done      = nfs4_read_done,
8518         .write_setup    = nfs4_proc_write_setup,
8519         .write_done     = nfs4_write_done,
8520         .commit_setup   = nfs4_proc_commit_setup,
8521         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8522         .commit_done    = nfs4_commit_done,
8523         .lock           = nfs4_proc_lock,
8524         .clear_acl_cache = nfs4_zap_acl_attr,
8525         .close_context  = nfs4_close_context,
8526         .open_context   = nfs4_atomic_open,
8527         .have_delegation = nfs4_have_delegation,
8528         .return_delegation = nfs4_inode_return_delegation,
8529         .alloc_client   = nfs4_alloc_client,
8530         .init_client    = nfs4_init_client,
8531         .free_client    = nfs4_free_client,
8532         .create_server  = nfs4_create_server,
8533         .clone_server   = nfs_clone_server,
8534 };
8535
8536 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8537         .prefix = XATTR_NAME_NFSV4_ACL,
8538         .list   = nfs4_xattr_list_nfs4_acl,
8539         .get    = nfs4_xattr_get_nfs4_acl,
8540         .set    = nfs4_xattr_set_nfs4_acl,
8541 };
8542
8543 const struct xattr_handler *nfs4_xattr_handlers[] = {
8544         &nfs4_xattr_nfs4_acl_handler,
8545 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8546         &nfs4_xattr_nfs4_label_handler,
8547 #endif
8548         NULL
8549 };
8550
8551 /*
8552  * Local variables:
8553  *  c-basic-offset: 8
8554  * End:
8555  */