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_FILE_OPEN:
 162                 return -EBUSY;
 163         default:
 164                 dprintk("%s could not handle NFSv4 error %d\n",
 165                                 __func__, -err);
 166                 break;
 167         }
 168         return -EIO;
 169 }
 170
 171 /*
 172  * This is our standard bitmap for GETATTR requests.
 173  */
 174 const u32 nfs4_fattr_bitmap[3] = {
 175         FATTR4_WORD0_TYPE
 176         | FATTR4_WORD0_CHANGE
 177         | FATTR4_WORD0_SIZE
 178         | FATTR4_WORD0_FSID
 179         | FATTR4_WORD0_FILEID,
 180         FATTR4_WORD1_MODE
 181         | FATTR4_WORD1_NUMLINKS
 182         | FATTR4_WORD1_OWNER
 183         | FATTR4_WORD1_OWNER_GROUP
 184         | FATTR4_WORD1_RAWDEV
 185         | FATTR4_WORD1_SPACE_USED
 186         | FATTR4_WORD1_TIME_ACCESS
 187         | FATTR4_WORD1_TIME_METADATA
 188         | FATTR4_WORD1_TIME_MODIFY,
 189 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 190         FATTR4_WORD2_SECURITY_LABEL
 191 #endif
 192 };
 193
 194 static const u32 nfs4_pnfs_open_bitmap[3] = {
 195         FATTR4_WORD0_TYPE
 196         | FATTR4_WORD0_CHANGE
 197         | FATTR4_WORD0_SIZE
 198         | FATTR4_WORD0_FSID
 199         | FATTR4_WORD0_FILEID,
 200         FATTR4_WORD1_MODE
 201         | FATTR4_WORD1_NUMLINKS
 202         | FATTR4_WORD1_OWNER
 203         | FATTR4_WORD1_OWNER_GROUP
 204         | FATTR4_WORD1_RAWDEV
 205         | FATTR4_WORD1_SPACE_USED
 206         | FATTR4_WORD1_TIME_ACCESS
 207         | FATTR4_WORD1_TIME_METADATA
 208         | FATTR4_WORD1_TIME_MODIFY,
 209         FATTR4_WORD2_MDSTHRESHOLD
 210 };
 211
 212 static const u32 nfs4_open_noattr_bitmap[3] = {
 213         FATTR4_WORD0_TYPE
 214         | FATTR4_WORD0_CHANGE
 215         | FATTR4_WORD0_FILEID,
 216 };
 217
 218 const u32 nfs4_statfs_bitmap[3] = {
 219         FATTR4_WORD0_FILES_AVAIL
 220         | FATTR4_WORD0_FILES_FREE
 221         | FATTR4_WORD0_FILES_TOTAL,
 222         FATTR4_WORD1_SPACE_AVAIL
 223         | FATTR4_WORD1_SPACE_FREE
 224         | FATTR4_WORD1_SPACE_TOTAL
 225 };
 226
 227 const u32 nfs4_pathconf_bitmap[3] = {
 228         FATTR4_WORD0_MAXLINK
 229         | FATTR4_WORD0_MAXNAME,
 230         0
 231 };
 232
 233 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 234                         | FATTR4_WORD0_MAXREAD
 235                         | FATTR4_WORD0_MAXWRITE
 236                         | FATTR4_WORD0_LEASE_TIME,
 237                         FATTR4_WORD1_TIME_DELTA
 238                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 239                         FATTR4_WORD2_LAYOUT_BLKSIZE
 240 };
 241
 242 const u32 nfs4_fs_locations_bitmap[3] = {
 243         FATTR4_WORD0_TYPE
 244         | FATTR4_WORD0_CHANGE
 245         | FATTR4_WORD0_SIZE
 246         | FATTR4_WORD0_FSID
 247         | FATTR4_WORD0_FILEID
 248         | FATTR4_WORD0_FS_LOCATIONS,
 249         FATTR4_WORD1_MODE
 250         | FATTR4_WORD1_NUMLINKS
 251         | FATTR4_WORD1_OWNER
 252         | FATTR4_WORD1_OWNER_GROUP
 253         | FATTR4_WORD1_RAWDEV
 254         | FATTR4_WORD1_SPACE_USED
 255         | FATTR4_WORD1_TIME_ACCESS
 256         | FATTR4_WORD1_TIME_METADATA
 257         | FATTR4_WORD1_TIME_MODIFY
 258         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 259 };
 260
 261 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 262                 struct nfs4_readdir_arg *readdir)
 263 {
 264         __be32 *start, *p;
 265
 266         if (cookie > 2) {
 267                 readdir->cookie = cookie;
 268                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 269                 return;
 270         }
 271
 272         readdir->cookie = 0;
 273         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 274         if (cookie == 2)
 275                 return;
 276
 277         /*
 278          * NFSv4 servers do not return entries for '.' and '..'
 279          * Therefore, we fake these entries here.  We let '.'
 280          * have cookie 0 and '..' have cookie 1.  Note that
 281          * when talking to the server, we always send cookie 0
 282          * instead of 1 or 2.
 283          */
 284         start = p = kmap_atomic(*readdir->pages);
 285
 286         if (cookie == 0) {
 287                 *p++ = xdr_one;                                  /* next */
 288                 *p++ = xdr_zero;                   /* cookie, first word */
 289                 *p++ = xdr_one;                   /* cookie, second word */
 290                 *p++ = xdr_one;                             /* entry len */
 291                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 292                 p++;
 293                 *p++ = xdr_one;                         /* bitmap length */
 294                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 295                 *p++ = htonl(8);              /* attribute buffer length */
 296                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 297         }
 298
 299         *p++ = xdr_one;                                  /* next */
 300         *p++ = xdr_zero;                   /* cookie, first word */
 301         *p++ = xdr_two;                   /* cookie, second word */
 302         *p++ = xdr_two;                             /* entry len */
 303         memcpy(p, "..\0\0", 4);                         /* entry */
 304         p++;
 305         *p++ = xdr_one;                         /* bitmap length */
 306         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 307         *p++ = htonl(8);              /* attribute buffer length */
 308         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 309
 310         readdir->pgbase = (char *)p - (char *)start;
 311         readdir->count -= readdir->pgbase;
 312         kunmap_atomic(start);
 313 }
 314
 315 static long nfs4_update_delay(long *timeout)
 316 {
 317         long ret;
 318         if (!timeout)
 319                 return NFS4_POLL_RETRY_MAX;
 320         if (*timeout <= 0)
 321                 *timeout = NFS4_POLL_RETRY_MIN;
 322         if (*timeout > NFS4_POLL_RETRY_MAX)
 323                 *timeout = NFS4_POLL_RETRY_MAX;
 324         ret = *timeout;
 325         *timeout <<= 1;
 326         return ret;
 327 }
 328
 329 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 330 {
 331         int res = 0;
 332
 333         might_sleep();
 334
 335         freezable_schedule_timeout_killable_unsafe(
 336                 nfs4_update_delay(timeout));
 337         if (fatal_signal_pending(current))
 338                 res = -ERESTARTSYS;
 339         return res;
 340 }
 341
 342 /* This is the error handling routine for processes that are allowed
 343  * to sleep.
 344  */
 345 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 346 {
 347         struct nfs_client *clp = server->nfs_client;
 348         struct nfs4_state *state = exception->state;
 349         struct inode *inode = exception->inode;
 350         int ret = errorcode;
 351
 352         exception->retry = 0;
 353         switch(errorcode) {
 354                 case 0:
 355                         return 0;
 356                 case -NFS4ERR_OPENMODE:
 357                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 358                                 nfs4_inode_return_delegation(inode);
 359                                 exception->retry = 1;
 360                                 return 0;
 361                         }
 362                         if (state == NULL)
 363                                 break;
 364                         ret = nfs4_schedule_stateid_recovery(server, state);
 365                         if (ret < 0)
 366                                 break;
 367                         goto wait_on_recovery;
 368                 case -NFS4ERR_DELEG_REVOKED:
 369                 case -NFS4ERR_ADMIN_REVOKED:
 370                 case -NFS4ERR_BAD_STATEID:
 371                         if (state == NULL)
 372                                 break;
 373                         ret = nfs4_schedule_stateid_recovery(server, state);
 374                         if (ret < 0)
 375                                 break;
 376                         goto wait_on_recovery;
 377                 case -NFS4ERR_EXPIRED:
 378                         if (state != NULL) {
 379                                 ret = nfs4_schedule_stateid_recovery(server, state);
 380                                 if (ret < 0)
 381                                         break;
 382                         }
 383                 case -NFS4ERR_STALE_STATEID:
 384                 case -NFS4ERR_STALE_CLIENTID:
 385                         nfs4_schedule_lease_recovery(clp);
 386                         goto wait_on_recovery;
 387                 case -NFS4ERR_MOVED:
 388                         ret = nfs4_schedule_migration_recovery(server);
 389                         if (ret < 0)
 390                                 break;
 391                         goto wait_on_recovery;
 392                 case -NFS4ERR_LEASE_MOVED:
 393                         nfs4_schedule_lease_moved_recovery(clp);
 394                         goto wait_on_recovery;
 395 #if defined(CONFIG_NFS_V4_1)
 396                 case -NFS4ERR_BADSESSION:
 397                 case -NFS4ERR_BADSLOT:
 398                 case -NFS4ERR_BAD_HIGH_SLOT:
 399                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 400                 case -NFS4ERR_DEADSESSION:
 401                 case -NFS4ERR_SEQ_FALSE_RETRY:
 402                 case -NFS4ERR_SEQ_MISORDERED:
 403                         dprintk("%s ERROR: %d Reset session\n", __func__,
 404                                 errorcode);
 405                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 406                         goto wait_on_recovery;
 407 #endif /* defined(CONFIG_NFS_V4_1) */
 408                 case -NFS4ERR_FILE_OPEN:
 409                         if (exception->timeout > HZ) {
 410                                 /* We have retried a decent amount, time to
 411                                  * fail
 412                                  */
 413                                 ret = -EBUSY;
 414                                 break;
 415                         }
 416                 case -NFS4ERR_GRACE:
 417                 case -NFS4ERR_DELAY:
 418                         ret = nfs4_delay(server->client, &exception->timeout);
 419                         if (ret != 0)
 420                                 break;
 421                 case -NFS4ERR_RETRY_UNCACHED_REP:
 422                 case -NFS4ERR_OLD_STATEID:
 423                         exception->retry = 1;
 424                         break;
 425                 case -NFS4ERR_BADOWNER:
 426                         /* The following works around a Linux server bug! */
 427                 case -NFS4ERR_BADNAME:
 428                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 429                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 430                                 exception->retry = 1;
 431                                 printk(KERN_WARNING "NFS: v4 server %s "
 432                                                 "does not accept raw "
 433                                                 "uid/gids. "
 434                                                 "Reenabling the idmapper.\n",
 435                                                 server->nfs_client->cl_hostname);
 436                         }
 437         }
 438         /* We failed to handle the error */
 439         return nfs4_map_errors(ret);
 440 wait_on_recovery:
 441         ret = nfs4_wait_clnt_recover(clp);
 442         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 443                 return -EIO;
 444         if (ret == 0)
 445                 exception->retry = 1;
 446         return ret;
 447 }
 448
 449 /*
 450  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 451  * or 'false' otherwise.
 452  */
 453 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 454 {
 455         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 456
 457         if (flavor == RPC_AUTH_GSS_KRB5I ||
 458             flavor == RPC_AUTH_GSS_KRB5P)
 459                 return true;
 460
 461         return false;
 462 }
 463
 464 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 465 {
 466         spin_lock(&clp->cl_lock);
 467         if (time_before(clp->cl_last_renewal,timestamp))
 468                 clp->cl_last_renewal = timestamp;
 469         spin_unlock(&clp->cl_lock);
 470 }
 471
 472 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 473 {
 474         do_renew_lease(server->nfs_client, timestamp);
 475 }
 476
 477 struct nfs4_call_sync_data {
 478         const struct nfs_server *seq_server;
 479         struct nfs4_sequence_args *seq_args;
 480         struct nfs4_sequence_res *seq_res;
 481 };
 482
 483 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 484                                struct nfs4_sequence_res *res, int cache_reply)
 485 {
 486         args->sa_slot = NULL;
 487         args->sa_cache_this = cache_reply;
 488         args->sa_privileged = 0;
 489
 490         res->sr_slot = NULL;
 491 }
 492
 493 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 494 {
 495         args->sa_privileged = 1;
 496 }
 497
 498 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 499                          struct nfs4_sequence_args *args,
 500                          struct nfs4_sequence_res *res,
 501                          struct rpc_task *task)
 502 {
 503         struct nfs4_slot *slot;
 504
 505         /* slot already allocated? */
 506         if (res->sr_slot != NULL)
 507                 goto out_start;
 508
 509         spin_lock(&tbl->slot_tbl_lock);
 510         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 511                 goto out_sleep;
 512
 513         slot = nfs4_alloc_slot(tbl);
 514         if (IS_ERR(slot)) {
 515                 if (slot == ERR_PTR(-ENOMEM))
 516                         task->tk_timeout = HZ >> 2;
 517                 goto out_sleep;
 518         }
 519         spin_unlock(&tbl->slot_tbl_lock);
 520
 521         args->sa_slot = slot;
 522         res->sr_slot = slot;
 523
 524 out_start:
 525         rpc_call_start(task);
 526         return 0;
 527
 528 out_sleep:
 529         if (args->sa_privileged)
 530                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 531                                 NULL, RPC_PRIORITY_PRIVILEGED);
 532         else
 533                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 534         spin_unlock(&tbl->slot_tbl_lock);
 535         return -EAGAIN;
 536 }
 537 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 538
 539 static int nfs40_sequence_done(struct rpc_task *task,
 540                                struct nfs4_sequence_res *res)
 541 {
 542         struct nfs4_slot *slot = res->sr_slot;
 543         struct nfs4_slot_table *tbl;
 544
 545         if (slot == NULL)
 546                 goto out;
 547
 548         tbl = slot->table;
 549         spin_lock(&tbl->slot_tbl_lock);
 550         if (!nfs41_wake_and_assign_slot(tbl, slot))
 551                 nfs4_free_slot(tbl, slot);
 552         spin_unlock(&tbl->slot_tbl_lock);
 553
 554         res->sr_slot = NULL;
 555 out:
 556         return 1;
 557 }
 558
 559 #if defined(CONFIG_NFS_V4_1)
 560
 561 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 562 {
 563         struct nfs4_session *session;
 564         struct nfs4_slot_table *tbl;
 565         struct nfs4_slot *slot = res->sr_slot;
 566         bool send_new_highest_used_slotid = false;
 567
 568         tbl = slot->table;
 569         session = tbl->session;
 570
 571         spin_lock(&tbl->slot_tbl_lock);
 572         /* Be nice to the server: try to ensure that the last transmitted
 573          * value for highest_user_slotid <= target_highest_slotid
 574          */
 575         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 576                 send_new_highest_used_slotid = true;
 577
 578         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 579                 send_new_highest_used_slotid = false;
 580                 goto out_unlock;
 581         }
 582         nfs4_free_slot(tbl, slot);
 583
 584         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 585                 send_new_highest_used_slotid = false;
 586 out_unlock:
 587         spin_unlock(&tbl->slot_tbl_lock);
 588         res->sr_slot = NULL;
 589         if (send_new_highest_used_slotid)
 590                 nfs41_server_notify_highest_slotid_update(session->clp);
 591 }
 592
 593 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 594 {
 595         struct nfs4_session *session;
 596         struct nfs4_slot *slot = res->sr_slot;
 597         struct nfs_client *clp;
 598         bool interrupted = false;
 599         int ret = 1;
 600
 601         if (slot == NULL)
 602                 goto out_noaction;
 603         /* don't increment the sequence number if the task wasn't sent */
 604         if (!RPC_WAS_SENT(task))
 605                 goto out;
 606
 607         session = slot->table->session;
 608
 609         if (slot->interrupted) {
 610                 slot->interrupted = 0;
 611                 interrupted = true;
 612         }
 613
 614         trace_nfs4_sequence_done(session, res);
 615         /* Check the SEQUENCE operation status */
 616         switch (res->sr_status) {
 617         case 0:
 618                 /* Update the slot's sequence and clientid lease timer */
 619                 ++slot->seq_nr;
 620                 clp = session->clp;
 621                 do_renew_lease(clp, res->sr_timestamp);
 622                 /* Check sequence flags */
 623                 if (res->sr_status_flags != 0)
 624                         nfs4_schedule_lease_recovery(clp);
 625                 nfs41_update_target_slotid(slot->table, slot, res);
 626                 break;
 627         case 1:
 628                 /*
 629                  * sr_status remains 1 if an RPC level error occurred.
 630                  * The server may or may not have processed the sequence
 631                  * operation..
 632                  * Mark the slot as having hosted an interrupted RPC call.
 633                  */
 634                 slot->interrupted = 1;
 635                 goto out;
 636         case -NFS4ERR_DELAY:
 637                 /* The server detected a resend of the RPC call and
 638                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 639                  * of RFC5661.
 640                  */
 641                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 642                         __func__,
 643                         slot->slot_nr,
 644                         slot->seq_nr);
 645                 goto out_retry;
 646         case -NFS4ERR_BADSLOT:
 647                 /*
 648                  * The slot id we used was probably retired. Try again
 649                  * using a different slot id.
 650                  */
 651                 goto retry_nowait;
 652         case -NFS4ERR_SEQ_MISORDERED:
 653                 /*
 654                  * Was the last operation on this sequence interrupted?
 655                  * If so, retry after bumping the sequence number.
 656                  */
 657                 if (interrupted) {
 658                         ++slot->seq_nr;
 659                         goto retry_nowait;
 660                 }
 661                 /*
 662                  * Could this slot have been previously retired?
 663                  * If so, then the server may be expecting seq_nr = 1!
 664                  */
 665                 if (slot->seq_nr != 1) {
 666                         slot->seq_nr = 1;
 667                         goto retry_nowait;
 668                 }
 669                 break;
 670         case -NFS4ERR_SEQ_FALSE_RETRY:
 671                 ++slot->seq_nr;
 672                 goto retry_nowait;
 673         default:
 674                 /* Just update the slot sequence no. */
 675                 ++slot->seq_nr;
 676         }
 677 out:
 678         /* The session may be reset by one of the error handlers. */
 679         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 680         nfs41_sequence_free_slot(res);
 681 out_noaction:
 682         return ret;
 683 retry_nowait:
 684         if (rpc_restart_call_prepare(task)) {
 685                 task->tk_status = 0;
 686                 ret = 0;
 687         }
 688         goto out;
 689 out_retry:
 690         if (!rpc_restart_call(task))
 691                 goto out;
 692         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 693         return 0;
 694 }
 695 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 696
 697 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 698 {
 699         if (res->sr_slot == NULL)
 700                 return 1;
 701         if (!res->sr_slot->table->session)
 702                 return nfs40_sequence_done(task, res);
 703         return nfs41_sequence_done(task, res);
 704 }
 705 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 706
 707 int nfs41_setup_sequence(struct nfs4_session *session,
 708                                 struct nfs4_sequence_args *args,
 709                                 struct nfs4_sequence_res *res,
 710                                 struct rpc_task *task)
 711 {
 712         struct nfs4_slot *slot;
 713         struct nfs4_slot_table *tbl;
 714
 715         dprintk("--> %s\n", __func__);
 716         /* slot already allocated? */
 717         if (res->sr_slot != NULL)
 718                 goto out_success;
 719
 720         tbl = &session->fc_slot_table;
 721
 722         task->tk_timeout = 0;
 723
 724         spin_lock(&tbl->slot_tbl_lock);
 725         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 726             !args->sa_privileged) {
 727                 /* The state manager will wait until the slot table is empty */
 728                 dprintk("%s session is draining\n", __func__);
 729                 goto out_sleep;
 730         }
 731
 732         slot = nfs4_alloc_slot(tbl);
 733         if (IS_ERR(slot)) {
 734                 /* If out of memory, try again in 1/4 second */
 735                 if (slot == ERR_PTR(-ENOMEM))
 736                         task->tk_timeout = HZ >> 2;
 737                 dprintk("<-- %s: no free slots\n", __func__);
 738                 goto out_sleep;
 739         }
 740         spin_unlock(&tbl->slot_tbl_lock);
 741
 742         args->sa_slot = slot;
 743
 744         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 745                         slot->slot_nr, slot->seq_nr);
 746
 747         res->sr_slot = slot;
 748         res->sr_timestamp = jiffies;
 749         res->sr_status_flags = 0;
 750         /*
 751          * sr_status is only set in decode_sequence, and so will remain
 752          * set to 1 if an rpc level failure occurs.
 753          */
 754         res->sr_status = 1;
 755         trace_nfs4_setup_sequence(session, args);
 756 out_success:
 757         rpc_call_start(task);
 758         return 0;
 759 out_sleep:
 760         /* Privileged tasks are queued with top priority */
 761         if (args->sa_privileged)
 762                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 763                                 NULL, RPC_PRIORITY_PRIVILEGED);
 764         else
 765                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 766         spin_unlock(&tbl->slot_tbl_lock);
 767         return -EAGAIN;
 768 }
 769 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 770
 771 static int nfs4_setup_sequence(const struct nfs_server *server,
 772                                struct nfs4_sequence_args *args,
 773                                struct nfs4_sequence_res *res,
 774                                struct rpc_task *task)
 775 {
 776         struct nfs4_session *session = nfs4_get_session(server);
 777         int ret = 0;
 778
 779         if (!session)
 780                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 781                                             args, res, task);
 782
 783         dprintk("--> %s clp %p session %p sr_slot %u\n",
 784                 __func__, session->clp, session, res->sr_slot ?
 785                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 786
 787         ret = nfs41_setup_sequence(session, args, res, task);
 788
 789         dprintk("<-- %s status=%d\n", __func__, ret);
 790         return ret;
 791 }
 792
 793 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 794 {
 795         struct nfs4_call_sync_data *data = calldata;
 796         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 797
 798         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 799
 800         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 801 }
 802
 803 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 804 {
 805         struct nfs4_call_sync_data *data = calldata;
 806
 807         nfs41_sequence_done(task, data->seq_res);
 808 }
 809
 810 static const struct rpc_call_ops nfs41_call_sync_ops = {
 811         .rpc_call_prepare = nfs41_call_sync_prepare,
 812         .rpc_call_done = nfs41_call_sync_done,
 813 };
 814
 815 #else   /* !CONFIG_NFS_V4_1 */
 816
 817 static int nfs4_setup_sequence(const struct nfs_server *server,
 818                                struct nfs4_sequence_args *args,
 819                                struct nfs4_sequence_res *res,
 820                                struct rpc_task *task)
 821 {
 822         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 823                                     args, res, task);
 824 }
 825
 826 int nfs4_sequence_done(struct rpc_task *task,
 827                        struct nfs4_sequence_res *res)
 828 {
 829         return nfs40_sequence_done(task, res);
 830 }
 831 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 832
 833 #endif  /* !CONFIG_NFS_V4_1 */
 834
 835 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 836 {
 837         struct nfs4_call_sync_data *data = calldata;
 838         nfs4_setup_sequence(data->seq_server,
 839                                 data->seq_args, data->seq_res, task);
 840 }
 841
 842 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 843 {
 844         struct nfs4_call_sync_data *data = calldata;
 845         nfs4_sequence_done(task, data->seq_res);
 846 }
 847
 848 static const struct rpc_call_ops nfs40_call_sync_ops = {
 849         .rpc_call_prepare = nfs40_call_sync_prepare,
 850         .rpc_call_done = nfs40_call_sync_done,
 851 };
 852
 853 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 854                                    struct nfs_server *server,
 855                                    struct rpc_message *msg,
 856                                    struct nfs4_sequence_args *args,
 857                                    struct nfs4_sequence_res *res)
 858 {
 859         int ret;
 860         struct rpc_task *task;
 861         struct nfs_client *clp = server->nfs_client;
 862         struct nfs4_call_sync_data data = {
 863                 .seq_server = server,
 864                 .seq_args = args,
 865                 .seq_res = res,
 866         };
 867         struct rpc_task_setup task_setup = {
 868                 .rpc_client = clnt,
 869                 .rpc_message = msg,
 870                 .callback_ops = clp->cl_mvops->call_sync_ops,
 871                 .callback_data = &data
 872         };
 873
 874         task = rpc_run_task(&task_setup);
 875         if (IS_ERR(task))
 876                 ret = PTR_ERR(task);
 877         else {
 878                 ret = task->tk_status;
 879                 rpc_put_task(task);
 880         }
 881         return ret;
 882 }
 883
 884 int nfs4_call_sync(struct rpc_clnt *clnt,
 885                    struct nfs_server *server,
 886                    struct rpc_message *msg,
 887                    struct nfs4_sequence_args *args,
 888                    struct nfs4_sequence_res *res,
 889                    int cache_reply)
 890 {
 891         nfs4_init_sequence(args, res, cache_reply);
 892         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 893 }
 894
 895 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 896 {
 897         struct nfs_inode *nfsi = NFS_I(dir);
 898
 899         spin_lock(&dir->i_lock);
 900         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 901         if (!cinfo->atomic || cinfo->before != dir->i_version)
 902                 nfs_force_lookup_revalidate(dir);
 903         dir->i_version = cinfo->after;
 904         nfs_fscache_invalidate(dir);
 905         spin_unlock(&dir->i_lock);
 906 }
 907
 908 struct nfs4_opendata {
 909         struct kref kref;
 910         struct nfs_openargs o_arg;
 911         struct nfs_openres o_res;
 912         struct nfs_open_confirmargs c_arg;
 913         struct nfs_open_confirmres c_res;
 914         struct nfs4_string owner_name;
 915         struct nfs4_string group_name;
 916         struct nfs_fattr f_attr;
 917         struct nfs4_label *f_label;
 918         struct dentry *dir;
 919         struct dentry *dentry;
 920         struct nfs4_state_owner *owner;
 921         struct nfs4_state *state;
 922         struct iattr attrs;
 923         unsigned long timestamp;
 924         unsigned int rpc_done : 1;
 925         unsigned int file_created : 1;
 926         unsigned int is_recover : 1;
 927         int rpc_status;
 928         int cancelled;
 929 };
 930
 931 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 932                 int err, struct nfs4_exception *exception)
 933 {
 934         if (err != -EINVAL)
 935                 return false;
 936         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 937                 return false;
 938         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 939         exception->retry = 1;
 940         return true;
 941 }
 942
 943 static u32
 944 nfs4_map_atomic_open_share(struct nfs_server *server,
 945                 fmode_t fmode, int openflags)
 946 {
 947         u32 res = 0;
 948
 949         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 950         case FMODE_READ:
 951                 res = NFS4_SHARE_ACCESS_READ;
 952                 break;
 953         case FMODE_WRITE:
 954                 res = NFS4_SHARE_ACCESS_WRITE;
 955                 break;
 956         case FMODE_READ|FMODE_WRITE:
 957                 res = NFS4_SHARE_ACCESS_BOTH;
 958         }
 959         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 960                 goto out;
 961         /* Want no delegation if we're using O_DIRECT */
 962         if (openflags & O_DIRECT)
 963                 res |= NFS4_SHARE_WANT_NO_DELEG;
 964 out:
 965         return res;
 966 }
 967
 968 static enum open_claim_type4
 969 nfs4_map_atomic_open_claim(struct nfs_server *server,
 970                 enum open_claim_type4 claim)
 971 {
 972         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 973                 return claim;
 974         switch (claim) {
 975         default:
 976                 return claim;
 977         case NFS4_OPEN_CLAIM_FH:
 978                 return NFS4_OPEN_CLAIM_NULL;
 979         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 980                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 981         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 982                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 983         }
 984 }
 985
 986 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 987 {
 988         p->o_res.f_attr = &p->f_attr;
 989         p->o_res.f_label = p->f_label;
 990         p->o_res.seqid = p->o_arg.seqid;
 991         p->c_res.seqid = p->c_arg.seqid;
 992         p->o_res.server = p->o_arg.server;
 993         p->o_res.access_request = p->o_arg.access;
 994         nfs_fattr_init(&p->f_attr);
 995         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 996 }
 997
 998 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 999                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1000                 const struct iattr *attrs,
1001                 struct nfs4_label *label,
1002                 enum open_claim_type4 claim,
1003                 gfp_t gfp_mask)
1004 {
1005         struct dentry *parent = dget_parent(dentry);
1006         struct inode *dir = parent->d_inode;
1007         struct nfs_server *server = NFS_SERVER(dir);
1008         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1009         struct nfs4_opendata *p;
1010
1011         p = kzalloc(sizeof(*p), gfp_mask);
1012         if (p == NULL)
1013                 goto err;
1014
1015         p->f_label = nfs4_label_alloc(server, gfp_mask);
1016         if (IS_ERR(p->f_label))
1017                 goto err_free_p;
1018
1019         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1020         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1021         if (IS_ERR(p->o_arg.seqid))
1022                 goto err_free_label;
1023         nfs_sb_active(dentry->d_sb);
1024         p->dentry = dget(dentry);
1025         p->dir = parent;
1026         p->owner = sp;
1027         atomic_inc(&sp->so_count);
1028         p->o_arg.open_flags = flags;
1029         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1030         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1031                         fmode, flags);
1032         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1033          * will return permission denied for all bits until close */
1034         if (!(flags & O_EXCL)) {
1035                 /* ask server to check for all possible rights as results
1036                  * are cached */
1037                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1038                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1039         }
1040         p->o_arg.clientid = server->nfs_client->cl_clientid;
1041         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1042         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1043         p->o_arg.name = &dentry->d_name;
1044         p->o_arg.server = server;
1045         p->o_arg.bitmask = nfs4_bitmask(server, label);
1046         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1047         p->o_arg.label = label;
1048         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1049         switch (p->o_arg.claim) {
1050         case NFS4_OPEN_CLAIM_NULL:
1051         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1052         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1053                 p->o_arg.fh = NFS_FH(dir);
1054                 break;
1055         case NFS4_OPEN_CLAIM_PREVIOUS:
1056         case NFS4_OPEN_CLAIM_FH:
1057         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1058         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1059                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1060         }
1061         if (attrs != NULL && attrs->ia_valid != 0) {
1062                 __u32 verf[2];
1063
1064                 p->o_arg.u.attrs = &p->attrs;
1065                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1066
1067                 verf[0] = jiffies;
1068                 verf[1] = current->pid;
1069                 memcpy(p->o_arg.u.verifier.data, verf,
1070                                 sizeof(p->o_arg.u.verifier.data));
1071         }
1072         p->c_arg.fh = &p->o_res.fh;
1073         p->c_arg.stateid = &p->o_res.stateid;
1074         p->c_arg.seqid = p->o_arg.seqid;
1075         nfs4_init_opendata_res(p);
1076         kref_init(&p->kref);
1077         return p;
1078
1079 err_free_label:
1080         nfs4_label_free(p->f_label);
1081 err_free_p:
1082         kfree(p);
1083 err:
1084         dput(parent);
1085         return NULL;
1086 }
1087
1088 static void nfs4_opendata_free(struct kref *kref)
1089 {
1090         struct nfs4_opendata *p = container_of(kref,
1091                         struct nfs4_opendata, kref);
1092         struct super_block *sb = p->dentry->d_sb;
1093
1094         nfs_free_seqid(p->o_arg.seqid);
1095         if (p->state != NULL)
1096                 nfs4_put_open_state(p->state);
1097         nfs4_put_state_owner(p->owner);
1098
1099         nfs4_label_free(p->f_label);
1100
1101         dput(p->dir);
1102         dput(p->dentry);
1103         nfs_sb_deactive(sb);
1104         nfs_fattr_free_names(&p->f_attr);
1105         kfree(p->f_attr.mdsthreshold);
1106         kfree(p);
1107 }
1108
1109 static void nfs4_opendata_put(struct nfs4_opendata *p)
1110 {
1111         if (p != NULL)
1112                 kref_put(&p->kref, nfs4_opendata_free);
1113 }
1114
1115 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1116 {
1117         int ret;
1118
1119         ret = rpc_wait_for_completion_task(task);
1120         return ret;
1121 }
1122
1123 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1124 {
1125         int ret = 0;
1126
1127         if (open_mode & (O_EXCL|O_TRUNC))
1128                 goto out;
1129         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1130                 case FMODE_READ:
1131                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1132                                 && state->n_rdonly != 0;
1133                         break;
1134                 case FMODE_WRITE:
1135                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1136                                 && state->n_wronly != 0;
1137                         break;
1138                 case FMODE_READ|FMODE_WRITE:
1139                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1140                                 && state->n_rdwr != 0;
1141         }
1142 out:
1143         return ret;
1144 }
1145
1146 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1147 {
1148         if (delegation == NULL)
1149                 return 0;
1150         if ((delegation->type & fmode) != fmode)
1151                 return 0;
1152         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1153                 return 0;
1154         nfs_mark_delegation_referenced(delegation);
1155         return 1;
1156 }
1157
1158 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1159 {
1160         switch (fmode) {
1161                 case FMODE_WRITE:
1162                         state->n_wronly++;
1163                         break;
1164                 case FMODE_READ:
1165                         state->n_rdonly++;
1166                         break;
1167                 case FMODE_READ|FMODE_WRITE:
1168                         state->n_rdwr++;
1169         }
1170         nfs4_state_set_mode_locked(state, state->state | fmode);
1171 }
1172
1173 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1174 {
1175         struct nfs_client *clp = state->owner->so_server->nfs_client;
1176         bool need_recover = false;
1177
1178         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1179                 need_recover = true;
1180         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1181                 need_recover = true;
1182         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1183                 need_recover = true;
1184         if (need_recover)
1185                 nfs4_state_mark_reclaim_nograce(clp, state);
1186 }
1187
1188 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1189                 nfs4_stateid *stateid)
1190 {
1191         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1192                 return true;
1193         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1194                 nfs_test_and_clear_all_open_stateid(state);
1195                 return true;
1196         }
1197         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1198                 return true;
1199         return false;
1200 }
1201
1202 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1203 {
1204         if (state->n_wronly)
1205                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1206         if (state->n_rdonly)
1207                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1208         if (state->n_rdwr)
1209                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1210 }
1211
1212 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1213                 nfs4_stateid *stateid, fmode_t fmode)
1214 {
1215         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1216         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1217         case FMODE_WRITE:
1218                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1219                 break;
1220         case FMODE_READ:
1221                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1222                 break;
1223         case 0:
1224                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1225                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1226                 clear_bit(NFS_OPEN_STATE, &state->flags);
1227         }
1228         if (stateid == NULL)
1229                 return;
1230         /* Handle races with OPEN */
1231         if (!nfs4_stateid_match_other(stateid, &state->open_stateid) ||
1232             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1233                 nfs_resync_open_stateid_locked(state);
1234                 return;
1235         }
1236         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1237                 nfs4_stateid_copy(&state->stateid, stateid);
1238         nfs4_stateid_copy(&state->open_stateid, stateid);
1239 }
1240
1241 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1242 {
1243         write_seqlock(&state->seqlock);
1244         nfs_clear_open_stateid_locked(state, stateid, fmode);
1245         write_sequnlock(&state->seqlock);
1246         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1247                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1248 }
1249
1250 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1251 {
1252         switch (fmode) {
1253                 case FMODE_READ:
1254                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1255                         break;
1256                 case FMODE_WRITE:
1257                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1258                         break;
1259                 case FMODE_READ|FMODE_WRITE:
1260                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1261         }
1262         if (!nfs_need_update_open_stateid(state, stateid))
1263                 return;
1264         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1265                 nfs4_stateid_copy(&state->stateid, stateid);
1266         nfs4_stateid_copy(&state->open_stateid, stateid);
1267 }
1268
1269 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1270 {
1271         /*
1272          * Protect the call to nfs4_state_set_mode_locked and
1273          * serialise the stateid update
1274          */
1275         write_seqlock(&state->seqlock);
1276         if (deleg_stateid != NULL) {
1277                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1278                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1279         }
1280         if (open_stateid != NULL)
1281                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1282         write_sequnlock(&state->seqlock);
1283         spin_lock(&state->owner->so_lock);
1284         update_open_stateflags(state, fmode);
1285         spin_unlock(&state->owner->so_lock);
1286 }
1287
1288 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1289 {
1290         struct nfs_inode *nfsi = NFS_I(state->inode);
1291         struct nfs_delegation *deleg_cur;
1292         int ret = 0;
1293
1294         fmode &= (FMODE_READ|FMODE_WRITE);
1295
1296         rcu_read_lock();
1297         deleg_cur = rcu_dereference(nfsi->delegation);
1298         if (deleg_cur == NULL)
1299                 goto no_delegation;
1300
1301         spin_lock(&deleg_cur->lock);
1302         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1303            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1304             (deleg_cur->type & fmode) != fmode)
1305                 goto no_delegation_unlock;
1306
1307         if (delegation == NULL)
1308                 delegation = &deleg_cur->stateid;
1309         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1310                 goto no_delegation_unlock;
1311
1312         nfs_mark_delegation_referenced(deleg_cur);
1313         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1314         ret = 1;
1315 no_delegation_unlock:
1316         spin_unlock(&deleg_cur->lock);
1317 no_delegation:
1318         rcu_read_unlock();
1319
1320         if (!ret && open_stateid != NULL) {
1321                 __update_open_stateid(state, open_stateid, NULL, fmode);
1322                 ret = 1;
1323         }
1324         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1325                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1326
1327         return ret;
1328 }
1329
1330 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1331                 const nfs4_stateid *stateid)
1332 {
1333         struct nfs4_state *state = lsp->ls_state;
1334         bool ret = false;
1335
1336         spin_lock(&state->state_lock);
1337         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1338                 goto out_noupdate;
1339         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1340                 goto out_noupdate;
1341         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1342         ret = true;
1343 out_noupdate:
1344         spin_unlock(&state->state_lock);
1345         return ret;
1346 }
1347
1348 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1349 {
1350         struct nfs_delegation *delegation;
1351
1352         rcu_read_lock();
1353         delegation = rcu_dereference(NFS_I(inode)->delegation);
1354         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1355                 rcu_read_unlock();
1356                 return;
1357         }
1358         rcu_read_unlock();
1359         nfs4_inode_return_delegation(inode);
1360 }
1361
1362 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1363 {
1364         struct nfs4_state *state = opendata->state;
1365         struct nfs_inode *nfsi = NFS_I(state->inode);
1366         struct nfs_delegation *delegation;
1367         int open_mode = opendata->o_arg.open_flags;
1368         fmode_t fmode = opendata->o_arg.fmode;
1369         nfs4_stateid stateid;
1370         int ret = -EAGAIN;
1371
1372         for (;;) {
1373                 spin_lock(&state->owner->so_lock);
1374                 if (can_open_cached(state, fmode, open_mode)) {
1375                         update_open_stateflags(state, fmode);
1376                         spin_unlock(&state->owner->so_lock);
1377                         goto out_return_state;
1378                 }
1379                 spin_unlock(&state->owner->so_lock);
1380                 rcu_read_lock();
1381                 delegation = rcu_dereference(nfsi->delegation);
1382                 if (!can_open_delegated(delegation, fmode)) {
1383                         rcu_read_unlock();
1384                         break;
1385                 }
1386                 /* Save the delegation */
1387                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1388                 rcu_read_unlock();
1389                 nfs_release_seqid(opendata->o_arg.seqid);
1390                 if (!opendata->is_recover) {
1391                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1392                         if (ret != 0)
1393                                 goto out;
1394                 }
1395                 ret = -EAGAIN;
1396
1397                 /* Try to update the stateid using the delegation */
1398                 if (update_open_stateid(state, NULL, &stateid, fmode))
1399                         goto out_return_state;
1400         }
1401 out:
1402         return ERR_PTR(ret);
1403 out_return_state:
1404         atomic_inc(&state->count);
1405         return state;
1406 }
1407
1408 static void
1409 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1410 {
1411         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1412         struct nfs_delegation *delegation;
1413         int delegation_flags = 0;
1414
1415         rcu_read_lock();
1416         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1417         if (delegation)
1418                 delegation_flags = delegation->flags;
1419         rcu_read_unlock();
1420         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1421                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1422                                    "returning a delegation for "
1423                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1424                                    clp->cl_hostname);
1425         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1426                 nfs_inode_set_delegation(state->inode,
1427                                          data->owner->so_cred,
1428                                          &data->o_res);
1429         else
1430                 nfs_inode_reclaim_delegation(state->inode,
1431                                              data->owner->so_cred,
1432                                              &data->o_res);
1433 }
1434
1435 /*
1436  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1437  * and update the nfs4_state.
1438  */
1439 static struct nfs4_state *
1440 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1441 {
1442         struct inode *inode = data->state->inode;
1443         struct nfs4_state *state = data->state;
1444         int ret;
1445
1446         if (!data->rpc_done) {
1447                 if (data->rpc_status) {
1448                         ret = data->rpc_status;
1449                         goto err;
1450                 }
1451                 /* cached opens have already been processed */
1452                 goto update;
1453         }
1454
1455         ret = nfs_refresh_inode(inode, &data->f_attr);
1456         if (ret)
1457                 goto err;
1458
1459         if (data->o_res.delegation_type != 0)
1460                 nfs4_opendata_check_deleg(data, state);
1461 update:
1462         update_open_stateid(state, &data->o_res.stateid, NULL,
1463                             data->o_arg.fmode);
1464         atomic_inc(&state->count);
1465
1466         return state;
1467 err:
1468         return ERR_PTR(ret);
1469
1470 }
1471
1472 static struct nfs4_state *
1473 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1474 {
1475         struct inode *inode;
1476         struct nfs4_state *state = NULL;
1477         int ret;
1478
1479         if (!data->rpc_done) {
1480                 state = nfs4_try_open_cached(data);
1481                 goto out;
1482         }
1483
1484         ret = -EAGAIN;
1485         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1486                 goto err;
1487         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1488         ret = PTR_ERR(inode);
1489         if (IS_ERR(inode))
1490                 goto err;
1491         ret = -ENOMEM;
1492         state = nfs4_get_open_state(inode, data->owner);
1493         if (state == NULL)
1494                 goto err_put_inode;
1495         if (data->o_res.delegation_type != 0)
1496                 nfs4_opendata_check_deleg(data, state);
1497         update_open_stateid(state, &data->o_res.stateid, NULL,
1498                         data->o_arg.fmode);
1499         iput(inode);
1500 out:
1501         nfs_release_seqid(data->o_arg.seqid);
1502         return state;
1503 err_put_inode:
1504         iput(inode);
1505 err:
1506         return ERR_PTR(ret);
1507 }
1508
1509 static struct nfs4_state *
1510 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1511 {
1512         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1513                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1514         return _nfs4_opendata_to_nfs4_state(data);
1515 }
1516
1517 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1518 {
1519         struct nfs_inode *nfsi = NFS_I(state->inode);
1520         struct nfs_open_context *ctx;
1521
1522         spin_lock(&state->inode->i_lock);
1523         list_for_each_entry(ctx, &nfsi->open_files, list) {
1524                 if (ctx->state != state)
1525                         continue;
1526                 get_nfs_open_context(ctx);
1527                 spin_unlock(&state->inode->i_lock);
1528                 return ctx;
1529         }
1530         spin_unlock(&state->inode->i_lock);
1531         return ERR_PTR(-ENOENT);
1532 }
1533
1534 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1535                 struct nfs4_state *state, enum open_claim_type4 claim)
1536 {
1537         struct nfs4_opendata *opendata;
1538
1539         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1540                         NULL, NULL, claim, GFP_NOFS);
1541         if (opendata == NULL)
1542                 return ERR_PTR(-ENOMEM);
1543         opendata->state = state;
1544         atomic_inc(&state->count);
1545         return opendata;
1546 }
1547
1548 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1549 {
1550         struct nfs4_state *newstate;
1551         int ret;
1552
1553         opendata->o_arg.open_flags = 0;
1554         opendata->o_arg.fmode = fmode;
1555         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1556         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1557         nfs4_init_opendata_res(opendata);
1558         ret = _nfs4_recover_proc_open(opendata);
1559         if (ret != 0)
1560                 return ret;
1561         newstate = nfs4_opendata_to_nfs4_state(opendata);
1562         if (IS_ERR(newstate))
1563                 return PTR_ERR(newstate);
1564         nfs4_close_state(newstate, fmode);
1565         *res = newstate;
1566         return 0;
1567 }
1568
1569 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1570 {
1571         struct nfs4_state *newstate;
1572         int ret;
1573
1574         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1575         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1576         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1577         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1578         /* memory barrier prior to reading state->n_* */
1579         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1580         clear_bit(NFS_OPEN_STATE, &state->flags);
1581         smp_rmb();
1582         if (state->n_rdwr != 0) {
1583                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1584                 if (ret != 0)
1585                         return ret;
1586                 if (newstate != state)
1587                         return -ESTALE;
1588         }
1589         if (state->n_wronly != 0) {
1590                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1591                 if (ret != 0)
1592                         return ret;
1593                 if (newstate != state)
1594                         return -ESTALE;
1595         }
1596         if (state->n_rdonly != 0) {
1597                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1598                 if (ret != 0)
1599                         return ret;
1600                 if (newstate != state)
1601                         return -ESTALE;
1602         }
1603         /*
1604          * We may have performed cached opens for all three recoveries.
1605          * Check if we need to update the current stateid.
1606          */
1607         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1608             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1609                 write_seqlock(&state->seqlock);
1610                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1611                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1612                 write_sequnlock(&state->seqlock);
1613         }
1614         return 0;
1615 }
1616
1617 /*
1618  * OPEN_RECLAIM:
1619  *      reclaim state on the server after a reboot.
1620  */
1621 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1622 {
1623         struct nfs_delegation *delegation;
1624         struct nfs4_opendata *opendata;
1625         fmode_t delegation_type = 0;
1626         int status;
1627
1628         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1629                         NFS4_OPEN_CLAIM_PREVIOUS);
1630         if (IS_ERR(opendata))
1631                 return PTR_ERR(opendata);
1632         rcu_read_lock();
1633         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1634         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1635                 delegation_type = delegation->type;
1636         rcu_read_unlock();
1637         opendata->o_arg.u.delegation_type = delegation_type;
1638         status = nfs4_open_recover(opendata, state);
1639         nfs4_opendata_put(opendata);
1640         return status;
1641 }
1642
1643 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1644 {
1645         struct nfs_server *server = NFS_SERVER(state->inode);
1646         struct nfs4_exception exception = { };
1647         int err;
1648         do {
1649                 err = _nfs4_do_open_reclaim(ctx, state);
1650                 trace_nfs4_open_reclaim(ctx, 0, err);
1651                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1652                         continue;
1653                 if (err != -NFS4ERR_DELAY)
1654                         break;
1655                 nfs4_handle_exception(server, err, &exception);
1656         } while (exception.retry);
1657         return err;
1658 }
1659
1660 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1661 {
1662         struct nfs_open_context *ctx;
1663         int ret;
1664
1665         ctx = nfs4_state_find_open_context(state);
1666         if (IS_ERR(ctx))
1667                 return -EAGAIN;
1668         ret = nfs4_do_open_reclaim(ctx, state);
1669         put_nfs_open_context(ctx);
1670         return ret;
1671 }
1672
1673 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1674 {
1675         switch (err) {
1676                 default:
1677                         printk(KERN_ERR "NFS: %s: unhandled error "
1678                                         "%d.\n", __func__, err);
1679                 case 0:
1680                 case -ENOENT:
1681                 case -ESTALE:
1682                         break;
1683                 case -NFS4ERR_BADSESSION:
1684                 case -NFS4ERR_BADSLOT:
1685                 case -NFS4ERR_BAD_HIGH_SLOT:
1686                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1687                 case -NFS4ERR_DEADSESSION:
1688                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1689                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1690                         return -EAGAIN;
1691                 case -NFS4ERR_STALE_CLIENTID:
1692                 case -NFS4ERR_STALE_STATEID:
1693                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1694                 case -NFS4ERR_EXPIRED:
1695                         /* Don't recall a delegation if it was lost */
1696                         nfs4_schedule_lease_recovery(server->nfs_client);
1697                         return -EAGAIN;
1698                 case -NFS4ERR_MOVED:
1699                         nfs4_schedule_migration_recovery(server);
1700                         return -EAGAIN;
1701                 case -NFS4ERR_LEASE_MOVED:
1702                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1703                         return -EAGAIN;
1704                 case -NFS4ERR_DELEG_REVOKED:
1705                 case -NFS4ERR_ADMIN_REVOKED:
1706                 case -NFS4ERR_BAD_STATEID:
1707                 case -NFS4ERR_OPENMODE:
1708                         nfs_inode_find_state_and_recover(state->inode,
1709                                         stateid);
1710                         nfs4_schedule_stateid_recovery(server, state);
1711                         return -EAGAIN;
1712                 case -NFS4ERR_DELAY:
1713                 case -NFS4ERR_GRACE:
1714                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1715                         ssleep(1);
1716                         return -EAGAIN;
1717                 case -ENOMEM:
1718                 case -NFS4ERR_DENIED:
1719                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1720                         return 0;
1721         }
1722         return err;
1723 }
1724
1725 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1726 {
1727         struct nfs_server *server = NFS_SERVER(state->inode);
1728         struct nfs4_opendata *opendata;
1729         int err;
1730
1731         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1732                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1733         if (IS_ERR(opendata))
1734                 return PTR_ERR(opendata);
1735         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1736         err = nfs4_open_recover(opendata, state);
1737         nfs4_opendata_put(opendata);
1738         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1739 }
1740
1741 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1742 {
1743         struct nfs4_opendata *data = calldata;
1744
1745         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1746                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1747 }
1748
1749 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1750 {
1751         struct nfs4_opendata *data = calldata;
1752
1753         nfs40_sequence_done(task, &data->c_res.seq_res);
1754
1755         data->rpc_status = task->tk_status;
1756         if (data->rpc_status == 0) {
1757                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1758                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1759                 renew_lease(data->o_res.server, data->timestamp);
1760                 data->rpc_done = 1;
1761         }
1762 }
1763
1764 static void nfs4_open_confirm_release(void *calldata)
1765 {
1766         struct nfs4_opendata *data = calldata;
1767         struct nfs4_state *state = NULL;
1768
1769         /* If this request hasn't been cancelled, do nothing */
1770         if (data->cancelled == 0)
1771                 goto out_free;
1772         /* In case of error, no cleanup! */
1773         if (!data->rpc_done)
1774                 goto out_free;
1775         state = nfs4_opendata_to_nfs4_state(data);
1776         if (!IS_ERR(state))
1777                 nfs4_close_state(state, data->o_arg.fmode);
1778 out_free:
1779         nfs4_opendata_put(data);
1780 }
1781
1782 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1783         .rpc_call_prepare = nfs4_open_confirm_prepare,
1784         .rpc_call_done = nfs4_open_confirm_done,
1785         .rpc_release = nfs4_open_confirm_release,
1786 };
1787
1788 /*
1789  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1790  */
1791 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1792 {
1793         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1794         struct rpc_task *task;
1795         struct  rpc_message msg = {
1796                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1797                 .rpc_argp = &data->c_arg,
1798                 .rpc_resp = &data->c_res,
1799                 .rpc_cred = data->owner->so_cred,
1800         };
1801         struct rpc_task_setup task_setup_data = {
1802                 .rpc_client = server->client,
1803                 .rpc_message = &msg,
1804                 .callback_ops = &nfs4_open_confirm_ops,
1805                 .callback_data = data,
1806                 .workqueue = nfsiod_workqueue,
1807                 .flags = RPC_TASK_ASYNC,
1808         };
1809         int status;
1810
1811         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1812         kref_get(&data->kref);
1813         data->rpc_done = 0;
1814         data->rpc_status = 0;
1815         data->timestamp = jiffies;
1816         task = rpc_run_task(&task_setup_data);
1817         if (IS_ERR(task))
1818                 return PTR_ERR(task);
1819         status = nfs4_wait_for_completion_rpc_task(task);
1820         if (status != 0) {
1821                 data->cancelled = 1;
1822                 smp_wmb();
1823         } else
1824                 status = data->rpc_status;
1825         rpc_put_task(task);
1826         return status;
1827 }
1828
1829 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1830 {
1831         struct nfs4_opendata *data = calldata;
1832         struct nfs4_state_owner *sp = data->owner;
1833         struct nfs_client *clp = sp->so_server->nfs_client;
1834
1835         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1836                 goto out_wait;
1837         /*
1838          * Check if we still need to send an OPEN call, or if we can use
1839          * a delegation instead.
1840          */
1841         if (data->state != NULL) {
1842                 struct nfs_delegation *delegation;
1843
1844                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1845                         goto out_no_action;
1846                 rcu_read_lock();
1847                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1848                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1849                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1850                     can_open_delegated(delegation, data->o_arg.fmode))
1851                         goto unlock_no_action;
1852                 rcu_read_unlock();
1853         }
1854         /* Update client id. */
1855         data->o_arg.clientid = clp->cl_clientid;
1856         switch (data->o_arg.claim) {
1857         case NFS4_OPEN_CLAIM_PREVIOUS:
1858         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1859         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1860                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1861         case NFS4_OPEN_CLAIM_FH:
1862                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1863                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1864         }
1865         data->timestamp = jiffies;
1866         if (nfs4_setup_sequence(data->o_arg.server,
1867                                 &data->o_arg.seq_args,
1868                                 &data->o_res.seq_res,
1869                                 task) != 0)
1870                 nfs_release_seqid(data->o_arg.seqid);
1871
1872         /* Set the create mode (note dependency on the session type) */
1873         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1874         if (data->o_arg.open_flags & O_EXCL) {
1875                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1876                 if (nfs4_has_persistent_session(clp))
1877                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1878                 else if (clp->cl_mvops->minor_version > 0)
1879                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1880         }
1881         return;
1882 unlock_no_action:
1883         rcu_read_unlock();
1884 out_no_action:
1885         task->tk_action = NULL;
1886 out_wait:
1887         nfs4_sequence_done(task, &data->o_res.seq_res);
1888 }
1889
1890 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1891 {
1892         struct nfs4_opendata *data = calldata;
1893
1894         data->rpc_status = task->tk_status;
1895
1896         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1897                 return;
1898
1899         if (task->tk_status == 0) {
1900                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1901                         switch (data->o_res.f_attr->mode & S_IFMT) {
1902                         case S_IFREG:
1903                                 break;
1904                         case S_IFLNK:
1905                                 data->rpc_status = -ELOOP;
1906                                 break;
1907                         case S_IFDIR:
1908                                 data->rpc_status = -EISDIR;
1909                                 break;
1910                         default:
1911                                 data->rpc_status = -ENOTDIR;
1912                         }
1913                 }
1914                 renew_lease(data->o_res.server, data->timestamp);
1915                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1916                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1917         }
1918         data->rpc_done = 1;
1919 }
1920
1921 static void nfs4_open_release(void *calldata)
1922 {
1923         struct nfs4_opendata *data = calldata;
1924         struct nfs4_state *state = NULL;
1925
1926         /* If this request hasn't been cancelled, do nothing */
1927         if (data->cancelled == 0)
1928                 goto out_free;
1929         /* In case of error, no cleanup! */
1930         if (data->rpc_status != 0 || !data->rpc_done)
1931                 goto out_free;
1932         /* In case we need an open_confirm, no cleanup! */
1933         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1934                 goto out_free;
1935         state = nfs4_opendata_to_nfs4_state(data);
1936         if (!IS_ERR(state))
1937                 nfs4_close_state(state, data->o_arg.fmode);
1938 out_free:
1939         nfs4_opendata_put(data);
1940 }
1941
1942 static const struct rpc_call_ops nfs4_open_ops = {
1943         .rpc_call_prepare = nfs4_open_prepare,
1944         .rpc_call_done = nfs4_open_done,
1945         .rpc_release = nfs4_open_release,
1946 };
1947
1948 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1949 {
1950         struct inode *dir = data->dir->d_inode;
1951         struct nfs_server *server = NFS_SERVER(dir);
1952         struct nfs_openargs *o_arg = &data->o_arg;
1953         struct nfs_openres *o_res = &data->o_res;
1954         struct rpc_task *task;
1955         struct rpc_message msg = {
1956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1957                 .rpc_argp = o_arg,
1958                 .rpc_resp = o_res,
1959                 .rpc_cred = data->owner->so_cred,
1960         };
1961         struct rpc_task_setup task_setup_data = {
1962                 .rpc_client = server->client,
1963                 .rpc_message = &msg,
1964                 .callback_ops = &nfs4_open_ops,
1965                 .callback_data = data,
1966                 .workqueue = nfsiod_workqueue,
1967                 .flags = RPC_TASK_ASYNC,
1968         };
1969         int status;
1970
1971         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1972         kref_get(&data->kref);
1973         data->rpc_done = 0;
1974         data->rpc_status = 0;
1975         data->cancelled = 0;
1976         data->is_recover = 0;
1977         if (isrecover) {
1978                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1979                 data->is_recover = 1;
1980         }
1981         task = rpc_run_task(&task_setup_data);
1982         if (IS_ERR(task))
1983                 return PTR_ERR(task);
1984         status = nfs4_wait_for_completion_rpc_task(task);
1985         if (status != 0) {
1986                 data->cancelled = 1;
1987                 smp_wmb();
1988         } else
1989                 status = data->rpc_status;
1990         rpc_put_task(task);
1991
1992         return status;
1993 }
1994
1995 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1996 {
1997         struct inode *dir = data->dir->d_inode;
1998         struct nfs_openres *o_res = &data->o_res;
1999         int status;
2000
2001         status = nfs4_run_open_task(data, 1);
2002         if (status != 0 || !data->rpc_done)
2003                 return status;
2004
2005         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2006
2007         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2008                 status = _nfs4_proc_open_confirm(data);
2009                 if (status != 0)
2010                         return status;
2011         }
2012
2013         return status;
2014 }
2015
2016 /*
2017  * Additional permission checks in order to distinguish between an
2018  * open for read, and an open for execute. This works around the
2019  * fact that NFSv4 OPEN treats read and execute permissions as being
2020  * the same.
2021  * Note that in the non-execute case, we want to turn off permission
2022  * checking if we just created a new file (POSIX open() semantics).
2023  */
2024 static int nfs4_opendata_access(struct rpc_cred *cred,
2025                                 struct nfs4_opendata *opendata,
2026                                 struct nfs4_state *state, fmode_t fmode,
2027                                 int openflags)
2028 {
2029         struct nfs_access_entry cache;
2030         u32 mask;
2031
2032         /* access call failed or for some reason the server doesn't
2033          * support any access modes -- defer access call until later */
2034         if (opendata->o_res.access_supported == 0)
2035                 return 0;
2036
2037         mask = 0;
2038         /*
2039          * Use openflags to check for exec, because fmode won't
2040          * always have FMODE_EXEC set when file open for exec.
2041          */
2042         if (openflags & __FMODE_EXEC) {
2043                 /* ONLY check for exec rights */
2044                 mask = MAY_EXEC;
2045         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2046                 mask = MAY_READ;
2047
2048         cache.cred = cred;
2049         cache.jiffies = jiffies;
2050         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2051         nfs_access_add_cache(state->inode, &cache);
2052
2053         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2054                 return 0;
2055
2056         /* even though OPEN succeeded, access is denied. Close the file */
2057         nfs4_close_state(state, fmode);
2058         return -EACCES;
2059 }
2060
2061 /*
2062  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2063  */
2064 static int _nfs4_proc_open(struct nfs4_opendata *data)
2065 {
2066         struct inode *dir = data->dir->d_inode;
2067         struct nfs_server *server = NFS_SERVER(dir);
2068         struct nfs_openargs *o_arg = &data->o_arg;
2069         struct nfs_openres *o_res = &data->o_res;
2070         int status;
2071
2072         status = nfs4_run_open_task(data, 0);
2073         if (!data->rpc_done)
2074                 return status;
2075         if (status != 0) {
2076                 if (status == -NFS4ERR_BADNAME &&
2077                                 !(o_arg->open_flags & O_CREAT))
2078                         return -ENOENT;
2079                 return status;
2080         }
2081
2082         nfs_fattr_map_and_free_names(server, &data->f_attr);
2083
2084         if (o_arg->open_flags & O_CREAT) {
2085                 update_changeattr(dir, &o_res->cinfo);
2086                 if (o_arg->open_flags & O_EXCL)
2087                         data->file_created = 1;
2088                 else if (o_res->cinfo.before != o_res->cinfo.after)
2089                         data->file_created = 1;
2090         }
2091         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2092                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2093         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2094                 status = _nfs4_proc_open_confirm(data);
2095                 if (status != 0)
2096                         return status;
2097         }
2098         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2099                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2100         return 0;
2101 }
2102
2103 static int nfs4_recover_expired_lease(struct nfs_server *server)
2104 {
2105         return nfs4_client_recover_expired_lease(server->nfs_client);
2106 }
2107
2108 /*
2109  * OPEN_EXPIRED:
2110  *      reclaim state on the server after a network partition.
2111  *      Assumes caller holds the appropriate lock
2112  */
2113 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2114 {
2115         struct nfs4_opendata *opendata;
2116         int ret;
2117
2118         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2119                         NFS4_OPEN_CLAIM_FH);
2120         if (IS_ERR(opendata))
2121                 return PTR_ERR(opendata);
2122         ret = nfs4_open_recover(opendata, state);
2123         if (ret == -ESTALE)
2124                 d_drop(ctx->dentry);
2125         nfs4_opendata_put(opendata);
2126         return ret;
2127 }
2128
2129 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2130 {
2131         struct nfs_server *server = NFS_SERVER(state->inode);
2132         struct nfs4_exception exception = { };
2133         int err;
2134
2135         do {
2136                 err = _nfs4_open_expired(ctx, state);
2137                 trace_nfs4_open_expired(ctx, 0, err);
2138                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2139                         continue;
2140                 switch (err) {
2141                 default:
2142                         goto out;
2143                 case -NFS4ERR_GRACE:
2144                 case -NFS4ERR_DELAY:
2145                         nfs4_handle_exception(server, err, &exception);
2146                         err = 0;
2147                 }
2148         } while (exception.retry);
2149 out:
2150         return err;
2151 }
2152
2153 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2154 {
2155         struct nfs_open_context *ctx;
2156         int ret;
2157
2158         ctx = nfs4_state_find_open_context(state);
2159         if (IS_ERR(ctx))
2160                 return -EAGAIN;
2161         ret = nfs4_do_open_expired(ctx, state);
2162         put_nfs_open_context(ctx);
2163         return ret;
2164 }
2165
2166 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2167 {
2168         nfs_remove_bad_delegation(state->inode);
2169         write_seqlock(&state->seqlock);
2170         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2171         write_sequnlock(&state->seqlock);
2172         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2173 }
2174
2175 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2176 {
2177         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2178                 nfs_finish_clear_delegation_stateid(state);
2179 }
2180
2181 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2182 {
2183         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2184         nfs40_clear_delegation_stateid(state);
2185         return nfs4_open_expired(sp, state);
2186 }
2187
2188 #if defined(CONFIG_NFS_V4_1)
2189 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2190 {
2191         struct nfs_server *server = NFS_SERVER(state->inode);
2192         nfs4_stateid stateid;
2193         struct nfs_delegation *delegation;
2194         struct rpc_cred *cred;
2195         int status;
2196
2197         /* Get the delegation credential for use by test/free_stateid */
2198         rcu_read_lock();
2199         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2200         if (delegation == NULL) {
2201                 rcu_read_unlock();
2202                 return;
2203         }
2204
2205         nfs4_stateid_copy(&stateid, &delegation->stateid);
2206         cred = get_rpccred(delegation->cred);
2207         rcu_read_unlock();
2208         status = nfs41_test_stateid(server, &stateid, cred);
2209         trace_nfs4_test_delegation_stateid(state, NULL, status);
2210
2211         if (status != NFS_OK) {
2212                 /* Free the stateid unless the server explicitly
2213                  * informs us the stateid is unrecognized. */
2214                 if (status != -NFS4ERR_BAD_STATEID)
2215                         nfs41_free_stateid(server, &stateid, cred);
2216                 nfs_finish_clear_delegation_stateid(state);
2217         }
2218
2219         put_rpccred(cred);
2220 }
2221
2222 /**
2223  * nfs41_check_open_stateid - possibly free an open stateid
2224  *
2225  * @state: NFSv4 state for an inode
2226  *
2227  * Returns NFS_OK if recovery for this stateid is now finished.
2228  * Otherwise a negative NFS4ERR value is returned.
2229  */
2230 static int nfs41_check_open_stateid(struct nfs4_state *state)
2231 {
2232         struct nfs_server *server = NFS_SERVER(state->inode);
2233         nfs4_stateid *stateid = &state->open_stateid;
2234         struct rpc_cred *cred = state->owner->so_cred;
2235         int status;
2236
2237         /* If a state reset has been done, test_stateid is unneeded */
2238         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2239             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2240             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2241                 return -NFS4ERR_BAD_STATEID;
2242
2243         status = nfs41_test_stateid(server, stateid, cred);
2244         trace_nfs4_test_open_stateid(state, NULL, status);
2245         if (status != NFS_OK) {
2246                 /* Free the stateid unless the server explicitly
2247                  * informs us the stateid is unrecognized. */
2248                 if (status != -NFS4ERR_BAD_STATEID)
2249                         nfs41_free_stateid(server, stateid, cred);
2250
2251                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2252                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2253                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2254                 clear_bit(NFS_OPEN_STATE, &state->flags);
2255         }
2256         return status;
2257 }
2258
2259 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2260 {
2261         int status;
2262
2263         nfs41_check_delegation_stateid(state);
2264         status = nfs41_check_open_stateid(state);
2265         if (status != NFS_OK)
2266                 status = nfs4_open_expired(sp, state);
2267         return status;
2268 }
2269 #endif
2270
2271 /*
2272  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2273  * fields corresponding to attributes that were used to store the verifier.
2274  * Make sure we clobber those fields in the later setattr call
2275  */
2276 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2277 {
2278         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2279             !(sattr->ia_valid & ATTR_ATIME_SET))
2280                 sattr->ia_valid |= ATTR_ATIME;
2281
2282         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2283             !(sattr->ia_valid & ATTR_MTIME_SET))
2284                 sattr->ia_valid |= ATTR_MTIME;
2285 }
2286
2287 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2288                 fmode_t fmode,
2289                 int flags,
2290                 struct nfs_open_context *ctx)
2291 {
2292         struct nfs4_state_owner *sp = opendata->owner;
2293         struct nfs_server *server = sp->so_server;
2294         struct dentry *dentry;
2295         struct nfs4_state *state;
2296         unsigned int seq;
2297         int ret;
2298
2299         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2300
2301         ret = _nfs4_proc_open(opendata);
2302         if (ret != 0)
2303                 goto out;
2304
2305         state = nfs4_opendata_to_nfs4_state(opendata);
2306         ret = PTR_ERR(state);
2307         if (IS_ERR(state))
2308                 goto out;
2309         if (server->caps & NFS_CAP_POSIX_LOCK)
2310                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2311
2312         dentry = opendata->dentry;
2313         if (dentry->d_inode == NULL) {
2314                 /* FIXME: Is this d_drop() ever needed? */
2315                 d_drop(dentry);
2316                 dentry = d_add_unique(dentry, igrab(state->inode));
2317                 if (dentry == NULL) {
2318                         dentry = opendata->dentry;
2319                 } else if (dentry != ctx->dentry) {
2320                         dput(ctx->dentry);
2321                         ctx->dentry = dget(dentry);
2322                 }
2323                 nfs_set_verifier(dentry,
2324                                 nfs_save_change_attribute(opendata->dir->d_inode));
2325         }
2326
2327         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2328         if (ret != 0)
2329                 goto out;
2330
2331         ctx->state = state;
2332         if (dentry->d_inode == state->inode) {
2333                 nfs_inode_attach_open_context(ctx);
2334                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2335                         nfs4_schedule_stateid_recovery(server, state);
2336         }
2337 out:
2338         return ret;
2339 }
2340
2341 /*
2342  * Returns a referenced nfs4_state
2343  */
2344 static int _nfs4_do_open(struct inode *dir,
2345                         struct nfs_open_context *ctx,
2346                         int flags,
2347                         struct iattr *sattr,
2348                         struct nfs4_label *label,
2349                         int *opened)
2350 {
2351         struct nfs4_state_owner  *sp;
2352         struct nfs4_state     *state = NULL;
2353         struct nfs_server       *server = NFS_SERVER(dir);
2354         struct nfs4_opendata *opendata;
2355         struct dentry *dentry = ctx->dentry;
2356         struct rpc_cred *cred = ctx->cred;
2357         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2358         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2359         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2360         struct nfs4_label *olabel = NULL;
2361         int status;
2362
2363         /* Protect against reboot recovery conflicts */
2364         status = -ENOMEM;
2365         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2366         if (sp == NULL) {
2367                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2368                 goto out_err;
2369         }
2370         status = nfs4_recover_expired_lease(server);
2371         if (status != 0)
2372                 goto err_put_state_owner;
2373         if (dentry->d_inode != NULL)
2374                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2375         status = -ENOMEM;
2376         if (dentry->d_inode)
2377                 claim = NFS4_OPEN_CLAIM_FH;
2378         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2379                         label, claim, GFP_KERNEL);
2380         if (opendata == NULL)
2381                 goto err_put_state_owner;
2382
2383         if (label) {
2384                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2385                 if (IS_ERR(olabel)) {
2386                         status = PTR_ERR(olabel);
2387                         goto err_opendata_put;
2388                 }
2389         }
2390
2391         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2392                 if (!opendata->f_attr.mdsthreshold) {
2393                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2394                         if (!opendata->f_attr.mdsthreshold)
2395                                 goto err_free_label;
2396                 }
2397                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2398         }
2399         if (dentry->d_inode != NULL)
2400                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2401
2402         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2403         if (status != 0)
2404                 goto err_free_label;
2405         state = ctx->state;
2406
2407         if ((opendata->o_arg.open_flags & O_EXCL) &&
2408             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2409                 nfs4_exclusive_attrset(opendata, sattr);
2410
2411                 nfs_fattr_init(opendata->o_res.f_attr);
2412                 status = nfs4_do_setattr(state->inode, cred,
2413                                 opendata->o_res.f_attr, sattr,
2414                                 state, label, olabel);
2415                 if (status == 0) {
2416                         nfs_setattr_update_inode(state->inode, sattr);
2417                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2418                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2419                 }
2420         }
2421         if (opendata->file_created)
2422                 *opened |= FILE_CREATED;
2423
2424         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2425                 *ctx_th = opendata->f_attr.mdsthreshold;
2426                 opendata->f_attr.mdsthreshold = NULL;
2427         }
2428
2429         nfs4_label_free(olabel);
2430
2431         nfs4_opendata_put(opendata);
2432         nfs4_put_state_owner(sp);
2433         return 0;
2434 err_free_label:
2435         nfs4_label_free(olabel);
2436 err_opendata_put:
2437         nfs4_opendata_put(opendata);
2438 err_put_state_owner:
2439         nfs4_put_state_owner(sp);
2440 out_err:
2441         return status;
2442 }
2443
2444
2445 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2446                                         struct nfs_open_context *ctx,
2447                                         int flags,
2448                                         struct iattr *sattr,
2449                                         struct nfs4_label *label,
2450                                         int *opened)
2451 {
2452         struct nfs_server *server = NFS_SERVER(dir);
2453         struct nfs4_exception exception = { };
2454         struct nfs4_state *res;
2455         int status;
2456
2457         do {
2458                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2459                 res = ctx->state;
2460                 trace_nfs4_open_file(ctx, flags, status);
2461                 if (status == 0)
2462                         break;
2463                 /* NOTE: BAD_SEQID means the server and client disagree about the
2464                  * book-keeping w.r.t. state-changing operations
2465                  * (OPEN/CLOSE/LOCK/LOCKU...)
2466                  * It is actually a sign of a bug on the client or on the server.
2467                  *
2468                  * If we receive a BAD_SEQID error in the particular case of
2469                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2470                  * have unhashed the old state_owner for us, and that we can
2471                  * therefore safely retry using a new one. We should still warn
2472                  * the user though...
2473                  */
2474                 if (status == -NFS4ERR_BAD_SEQID) {
2475                         pr_warn_ratelimited("NFS: v4 server %s "
2476                                         " returned a bad sequence-id error!\n",
2477                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2478                         exception.retry = 1;
2479                         continue;
2480                 }
2481                 /*
2482                  * BAD_STATEID on OPEN means that the server cancelled our
2483                  * state before it received the OPEN_CONFIRM.
2484                  * Recover by retrying the request as per the discussion
2485                  * on Page 181 of RFC3530.
2486                  */
2487                 if (status == -NFS4ERR_BAD_STATEID) {
2488                         exception.retry = 1;
2489                         continue;
2490                 }
2491                 if (status == -EAGAIN) {
2492                         /* We must have found a delegation */
2493                         exception.retry = 1;
2494                         continue;
2495                 }
2496                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2497                         continue;
2498                 res = ERR_PTR(nfs4_handle_exception(server,
2499                                         status, &exception));
2500         } while (exception.retry);
2501         return res;
2502 }
2503
2504 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2505                             struct nfs_fattr *fattr, struct iattr *sattr,
2506                             struct nfs4_state *state, struct nfs4_label *ilabel,
2507                             struct nfs4_label *olabel)
2508 {
2509         struct nfs_server *server = NFS_SERVER(inode);
2510         struct nfs_setattrargs  arg = {
2511                 .fh             = NFS_FH(inode),
2512                 .iap            = sattr,
2513                 .server         = server,
2514                 .bitmask = server->attr_bitmask,
2515                 .label          = ilabel,
2516         };
2517         struct nfs_setattrres  res = {
2518                 .fattr          = fattr,
2519                 .label          = olabel,
2520                 .server         = server,
2521         };
2522         struct rpc_message msg = {
2523                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2524                 .rpc_argp       = &arg,
2525                 .rpc_resp       = &res,
2526                 .rpc_cred       = cred,
2527         };
2528         unsigned long timestamp = jiffies;
2529         fmode_t fmode;
2530         bool truncate;
2531         int status;
2532
2533         arg.bitmask = nfs4_bitmask(server, ilabel);
2534         if (ilabel)
2535                 arg.bitmask = nfs4_bitmask(server, olabel);
2536
2537         nfs_fattr_init(fattr);
2538
2539         /* Servers should only apply open mode checks for file size changes */
2540         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2541         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2542
2543         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2544                 /* Use that stateid */
2545         } else if (truncate && state != NULL) {
2546                 struct nfs_lockowner lockowner = {
2547                         .l_owner = current->files,
2548                         .l_pid = current->tgid,
2549                 };
2550                 if (!nfs4_valid_open_stateid(state))
2551                         return -EBADF;
2552                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2553                                 &lockowner) == -EIO)
2554                         return -EBADF;
2555         } else
2556                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2557
2558         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2559         if (status == 0 && state != NULL)
2560                 renew_lease(server, timestamp);
2561         return status;
2562 }
2563
2564 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2565                            struct nfs_fattr *fattr, struct iattr *sattr,
2566                            struct nfs4_state *state, struct nfs4_label *ilabel,
2567                            struct nfs4_label *olabel)
2568 {
2569         struct nfs_server *server = NFS_SERVER(inode);
2570         struct nfs4_exception exception = {
2571                 .state = state,
2572                 .inode = inode,
2573         };
2574         int err;
2575         do {
2576                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2577                 trace_nfs4_setattr(inode, err);
2578                 switch (err) {
2579                 case -NFS4ERR_OPENMODE:
2580                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2581                                 pr_warn_once("NFSv4: server %s is incorrectly "
2582                                                 "applying open mode checks to "
2583                                                 "a SETATTR that is not "
2584                                                 "changing file size.\n",
2585                                                 server->nfs_client->cl_hostname);
2586                         }
2587                         if (state && !(state->state & FMODE_WRITE)) {
2588                                 err = -EBADF;
2589                                 if (sattr->ia_valid & ATTR_OPEN)
2590                                         err = -EACCES;
2591                                 goto out;
2592                         }
2593                 }
2594                 err = nfs4_handle_exception(server, err, &exception);
2595         } while (exception.retry);
2596 out:
2597         return err;
2598 }
2599
2600 struct nfs4_closedata {
2601         struct inode *inode;
2602         struct nfs4_state *state;
2603         struct nfs_closeargs arg;
2604         struct nfs_closeres res;
2605         struct nfs_fattr fattr;
2606         unsigned long timestamp;
2607         bool roc;
2608         u32 roc_barrier;
2609 };
2610
2611 static void nfs4_free_closedata(void *data)
2612 {
2613         struct nfs4_closedata *calldata = data;
2614         struct nfs4_state_owner *sp = calldata->state->owner;
2615         struct super_block *sb = calldata->state->inode->i_sb;
2616
2617         if (calldata->roc)
2618                 pnfs_roc_release(calldata->state->inode);
2619         nfs4_put_open_state(calldata->state);
2620         nfs_free_seqid(calldata->arg.seqid);
2621         nfs4_put_state_owner(sp);
2622         nfs_sb_deactive(sb);
2623         kfree(calldata);
2624 }
2625
2626 static void nfs4_close_done(struct rpc_task *task, void *data)
2627 {
2628         struct nfs4_closedata *calldata = data;
2629         struct nfs4_state *state = calldata->state;
2630         struct nfs_server *server = NFS_SERVER(calldata->inode);
2631         nfs4_stateid *res_stateid = NULL;
2632
2633         dprintk("%s: begin!\n", __func__);
2634         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2635                 return;
2636         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2637         /* hmm. we are done with the inode, and in the process of freeing
2638          * the state_owner. we keep this around to process errors
2639          */
2640         switch (task->tk_status) {
2641                 case 0:
2642                         res_stateid = &calldata->res.stateid;
2643                         if (calldata->arg.fmode == 0 && calldata->roc)
2644                                 pnfs_roc_set_barrier(state->inode,
2645                                                      calldata->roc_barrier);
2646                         renew_lease(server, calldata->timestamp);
2647                         break;
2648                 case -NFS4ERR_ADMIN_REVOKED:
2649                 case -NFS4ERR_STALE_STATEID:
2650                 case -NFS4ERR_OLD_STATEID:
2651                 case -NFS4ERR_BAD_STATEID:
2652                 case -NFS4ERR_EXPIRED:
2653                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2654                                                 &state->stateid)) {
2655                                 rpc_restart_call_prepare(task);
2656                                 goto out_release;
2657                         }
2658                         if (calldata->arg.fmode == 0)
2659                                 break;
2660                 default:
2661                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2662                                 rpc_restart_call_prepare(task);
2663                                 goto out_release;
2664                         }
2665         }
2666         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2667 out_release:
2668         nfs_release_seqid(calldata->arg.seqid);
2669         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2670         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2671 }
2672
2673 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2674 {
2675         struct nfs4_closedata *calldata = data;
2676         struct nfs4_state *state = calldata->state;
2677         struct inode *inode = calldata->inode;
2678         bool is_rdonly, is_wronly, is_rdwr;
2679         int call_close = 0;
2680
2681         dprintk("%s: begin!\n", __func__);
2682         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2683                 goto out_wait;
2684
2685         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2686         spin_lock(&state->owner->so_lock);
2687         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2688         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2689         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2690         nfs4_stateid_copy(&calldata->arg.stateid, &state->stateid);
2691         /* Calculate the change in open mode */
2692         calldata->arg.fmode = 0;
2693         if (state->n_rdwr == 0) {
2694                 if (state->n_rdonly == 0)
2695                         call_close |= is_rdonly;
2696                 else if (is_rdonly)
2697                         calldata->arg.fmode |= FMODE_READ;
2698                 if (state->n_wronly == 0)
2699                         call_close |= is_wronly;
2700                 else if (is_wronly)
2701                         calldata->arg.fmode |= FMODE_WRITE;
2702         } else if (is_rdwr)
2703                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2704
2705         if (calldata->arg.fmode == 0)
2706                 call_close |= is_rdwr;
2707
2708         if (!nfs4_valid_open_stateid(state))
2709                 call_close = 0;
2710         spin_unlock(&state->owner->so_lock);
2711
2712         if (!call_close) {
2713                 /* Note: exit _without_ calling nfs4_close_done */
2714                 goto out_no_action;
2715         }
2716
2717         if (calldata->arg.fmode == 0) {
2718                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2719                 if (calldata->roc &&
2720                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2721                         nfs_release_seqid(calldata->arg.seqid);
2722                         goto out_wait;
2723                     }
2724         }
2725         calldata->arg.share_access =
2726                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2727                                 calldata->arg.fmode, 0);
2728
2729         nfs_fattr_init(calldata->res.fattr);
2730         calldata->timestamp = jiffies;
2731         if (nfs4_setup_sequence(NFS_SERVER(inode),
2732                                 &calldata->arg.seq_args,
2733                                 &calldata->res.seq_res,
2734                                 task) != 0)
2735                 nfs_release_seqid(calldata->arg.seqid);
2736         dprintk("%s: done!\n", __func__);
2737         return;
2738 out_no_action:
2739         task->tk_action = NULL;
2740 out_wait:
2741         nfs4_sequence_done(task, &calldata->res.seq_res);
2742 }
2743
2744 static const struct rpc_call_ops nfs4_close_ops = {
2745         .rpc_call_prepare = nfs4_close_prepare,
2746         .rpc_call_done = nfs4_close_done,
2747         .rpc_release = nfs4_free_closedata,
2748 };
2749
2750 static bool nfs4_roc(struct inode *inode)
2751 {
2752         if (!nfs_have_layout(inode))
2753                 return false;
2754         return pnfs_roc(inode);
2755 }
2756
2757 /*
2758  * It is possible for data to be read/written from a mem-mapped file
2759  * after the sys_close call (which hits the vfs layer as a flush).
2760  * This means that we can't safely call nfsv4 close on a file until
2761  * the inode is cleared. This in turn means that we are not good
2762  * NFSv4 citizens - we do not indicate to the server to update the file's
2763  * share state even when we are done with one of the three share
2764  * stateid's in the inode.
2765  *
2766  * NOTE: Caller must be holding the sp->so_owner semaphore!
2767  */
2768 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2769 {
2770         struct nfs_server *server = NFS_SERVER(state->inode);
2771         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2772         struct nfs4_closedata *calldata;
2773         struct nfs4_state_owner *sp = state->owner;
2774         struct rpc_task *task;
2775         struct rpc_message msg = {
2776                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2777                 .rpc_cred = state->owner->so_cred,
2778         };
2779         struct rpc_task_setup task_setup_data = {
2780                 .rpc_client = server->client,
2781                 .rpc_message = &msg,
2782                 .callback_ops = &nfs4_close_ops,
2783                 .workqueue = nfsiod_workqueue,
2784                 .flags = RPC_TASK_ASYNC,
2785         };
2786         int status = -ENOMEM;
2787
2788         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2789                 &task_setup_data.rpc_client, &msg);
2790
2791         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2792         if (calldata == NULL)
2793                 goto out;
2794         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2795         calldata->inode = state->inode;
2796         calldata->state = state;
2797         calldata->arg.fh = NFS_FH(state->inode);
2798         /* Serialization for the sequence id */
2799         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2800         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2801         if (IS_ERR(calldata->arg.seqid))
2802                 goto out_free_calldata;
2803         calldata->arg.fmode = 0;
2804         calldata->arg.bitmask = server->cache_consistency_bitmask;
2805         calldata->res.fattr = &calldata->fattr;
2806         calldata->res.seqid = calldata->arg.seqid;
2807         calldata->res.server = server;
2808         calldata->roc = nfs4_roc(state->inode);
2809         nfs_sb_active(calldata->inode->i_sb);
2810
2811         msg.rpc_argp = &calldata->arg;
2812         msg.rpc_resp = &calldata->res;
2813         task_setup_data.callback_data = calldata;
2814         task = rpc_run_task(&task_setup_data);
2815         if (IS_ERR(task))
2816                 return PTR_ERR(task);
2817         status = 0;
2818         if (wait)
2819                 status = rpc_wait_for_completion_task(task);
2820         rpc_put_task(task);
2821         return status;
2822 out_free_calldata:
2823         kfree(calldata);
2824 out:
2825         nfs4_put_open_state(state);
2826         nfs4_put_state_owner(sp);
2827         return status;
2828 }
2829
2830 static struct inode *
2831 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2832                 int open_flags, struct iattr *attr, int *opened)
2833 {
2834         struct nfs4_state *state;
2835         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2836
2837         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2838
2839         /* Protect against concurrent sillydeletes */
2840         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2841
2842         nfs4_label_release_security(label);
2843
2844         if (IS_ERR(state))
2845                 return ERR_CAST(state);
2846         return state->inode;
2847 }
2848
2849 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2850 {
2851         if (ctx->state == NULL)
2852                 return;
2853         if (is_sync)
2854                 nfs4_close_sync(ctx->state, ctx->mode);
2855         else
2856                 nfs4_close_state(ctx->state, ctx->mode);
2857 }
2858
2859 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2860 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2861 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2862
2863 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2864 {
2865         struct nfs4_server_caps_arg args = {
2866                 .fhandle = fhandle,
2867         };
2868         struct nfs4_server_caps_res res = {};
2869         struct rpc_message msg = {
2870                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2871                 .rpc_argp = &args,
2872                 .rpc_resp = &res,
2873         };
2874         int status;
2875
2876         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2877         if (status == 0) {
2878                 /* Sanity check the server answers */
2879                 switch (server->nfs_client->cl_minorversion) {
2880                 case 0:
2881                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2882                         res.attr_bitmask[2] = 0;
2883                         break;
2884                 case 1:
2885                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2886                         break;
2887                 case 2:
2888                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2889                 }
2890                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2891                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2892                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2893                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2894                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2895                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2896                                 NFS_CAP_SECURITY_LABEL);
2897                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2898                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2899                         server->caps |= NFS_CAP_ACLS;
2900                 if (res.has_links != 0)
2901                         server->caps |= NFS_CAP_HARDLINKS;
2902                 if (res.has_symlinks != 0)
2903                         server->caps |= NFS_CAP_SYMLINKS;
2904                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2905                         server->caps |= NFS_CAP_FILEID;
2906                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2907                         server->caps |= NFS_CAP_MODE;
2908                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2909                         server->caps |= NFS_CAP_NLINK;
2910                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2911                         server->caps |= NFS_CAP_OWNER;
2912                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2913                         server->caps |= NFS_CAP_OWNER_GROUP;
2914                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2915                         server->caps |= NFS_CAP_ATIME;
2916                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2917                         server->caps |= NFS_CAP_CTIME;
2918                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2919                         server->caps |= NFS_CAP_MTIME;
2920 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2921                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2922                         server->caps |= NFS_CAP_SECURITY_LABEL;
2923 #endif
2924                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2925                                 sizeof(server->attr_bitmask));
2926                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2927
2928                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2929                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2930                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2931                 server->cache_consistency_bitmask[2] = 0;
2932                 server->acl_bitmask = res.acl_bitmask;
2933                 server->fh_expire_type = res.fh_expire_type;
2934         }
2935
2936         return status;
2937 }
2938
2939 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2940 {
2941         struct nfs4_exception exception = { };
2942         int err;
2943         do {
2944                 err = nfs4_handle_exception(server,
2945                                 _nfs4_server_capabilities(server, fhandle),
2946                                 &exception);
2947         } while (exception.retry);
2948         return err;
2949 }
2950
2951 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2952                 struct nfs_fsinfo *info)
2953 {
2954         u32 bitmask[3];
2955         struct nfs4_lookup_root_arg args = {
2956                 .bitmask = bitmask,
2957         };
2958         struct nfs4_lookup_res res = {
2959                 .server = server,
2960                 .fattr = info->fattr,
2961                 .fh = fhandle,
2962         };
2963         struct rpc_message msg = {
2964                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2965                 .rpc_argp = &args,
2966                 .rpc_resp = &res,
2967         };
2968
2969         bitmask[0] = nfs4_fattr_bitmap[0];
2970         bitmask[1] = nfs4_fattr_bitmap[1];
2971         /*
2972          * Process the label in the upcoming getfattr
2973          */
2974         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2975
2976         nfs_fattr_init(info->fattr);
2977         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2978 }
2979
2980 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2981                 struct nfs_fsinfo *info)
2982 {
2983         struct nfs4_exception exception = { };
2984         int err;
2985         do {
2986                 err = _nfs4_lookup_root(server, fhandle, info);
2987                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2988                 switch (err) {
2989                 case 0:
2990                 case -NFS4ERR_WRONGSEC:
2991                         goto out;
2992                 default:
2993                         err = nfs4_handle_exception(server, err, &exception);
2994                 }
2995         } while (exception.retry);
2996 out:
2997         return err;
2998 }
2999
3000 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3001                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3002 {
3003         struct rpc_auth_create_args auth_args = {
3004                 .pseudoflavor = flavor,
3005         };
3006         struct rpc_auth *auth;
3007         int ret;
3008
3009         auth = rpcauth_create(&auth_args, server->client);
3010         if (IS_ERR(auth)) {
3011                 ret = -EACCES;
3012                 goto out;
3013         }
3014         ret = nfs4_lookup_root(server, fhandle, info);
3015 out:
3016         return ret;
3017 }
3018
3019 /*
3020  * Retry pseudoroot lookup with various security flavors.  We do this when:
3021  *
3022  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3023  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3024  *
3025  * Returns zero on success, or a negative NFS4ERR value, or a
3026  * negative errno value.
3027  */
3028 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3029                               struct nfs_fsinfo *info)
3030 {
3031         /* Per 3530bis 15.33.5 */
3032         static const rpc_authflavor_t flav_array[] = {
3033                 RPC_AUTH_GSS_KRB5P,
3034                 RPC_AUTH_GSS_KRB5I,
3035                 RPC_AUTH_GSS_KRB5,
3036                 RPC_AUTH_UNIX,                  /* courtesy */
3037                 RPC_AUTH_NULL,
3038         };
3039         int status = -EPERM;
3040         size_t i;
3041
3042         if (server->auth_info.flavor_len > 0) {
3043                 /* try each flavor specified by user */
3044                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3045                         status = nfs4_lookup_root_sec(server, fhandle, info,
3046                                                 server->auth_info.flavors[i]);
3047                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3048                                 continue;
3049                         break;
3050                 }
3051         } else {
3052                 /* no flavors specified by user, try default list */
3053                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3054                         status = nfs4_lookup_root_sec(server, fhandle, info,
3055                                                       flav_array[i]);
3056                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3057                                 continue;
3058                         break;
3059                 }
3060         }
3061
3062         /*
3063          * -EACCESS could mean that the user doesn't have correct permissions
3064          * to access the mount.  It could also mean that we tried to mount
3065          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3066          * existing mount programs don't handle -EACCES very well so it should
3067          * be mapped to -EPERM instead.
3068          */
3069         if (status == -EACCES)
3070                 status = -EPERM;
3071         return status;
3072 }
3073
3074 static int nfs4_do_find_root_sec(struct nfs_server *server,
3075                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3076 {
3077         int mv = server->nfs_client->cl_minorversion;
3078         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3079 }
3080
3081 /**
3082  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3083  * @server: initialized nfs_server handle
3084  * @fhandle: we fill in the pseudo-fs root file handle
3085  * @info: we fill in an FSINFO struct
3086  * @auth_probe: probe the auth flavours
3087  *
3088  * Returns zero on success, or a negative errno.
3089  */
3090 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3091                          struct nfs_fsinfo *info,
3092                          bool auth_probe)
3093 {
3094         int status;
3095
3096         switch (auth_probe) {
3097         case false:
3098                 status = nfs4_lookup_root(server, fhandle, info);
3099                 if (status != -NFS4ERR_WRONGSEC)
3100                         break;
3101         default:
3102                 status = nfs4_do_find_root_sec(server, fhandle, info);
3103         }
3104
3105         if (status == 0)
3106                 status = nfs4_server_capabilities(server, fhandle);
3107         if (status == 0)
3108                 status = nfs4_do_fsinfo(server, fhandle, info);
3109
3110         return nfs4_map_errors(status);
3111 }
3112
3113 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3114                               struct nfs_fsinfo *info)
3115 {
3116         int error;
3117         struct nfs_fattr *fattr = info->fattr;
3118         struct nfs4_label *label = NULL;
3119
3120         error = nfs4_server_capabilities(server, mntfh);
3121         if (error < 0) {
3122                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3123                 return error;
3124         }
3125
3126         label = nfs4_label_alloc(server, GFP_KERNEL);
3127         if (IS_ERR(label))
3128                 return PTR_ERR(label);
3129
3130         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3131         if (error < 0) {
3132                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3133                 goto err_free_label;
3134         }
3135
3136         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3137             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3138                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3139
3140 err_free_label:
3141         nfs4_label_free(label);
3142
3143         return error;
3144 }
3145
3146 /*
3147  * Get locations and (maybe) other attributes of a referral.
3148  * Note that we'll actually follow the referral later when
3149  * we detect fsid mismatch in inode revalidation
3150  */
3151 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3152                              const struct qstr *name, struct nfs_fattr *fattr,
3153                              struct nfs_fh *fhandle)
3154 {
3155         int status = -ENOMEM;
3156         struct page *page = NULL;
3157         struct nfs4_fs_locations *locations = NULL;
3158
3159         page = alloc_page(GFP_KERNEL);
3160         if (page == NULL)
3161                 goto out;
3162         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3163         if (locations == NULL)
3164                 goto out;
3165
3166         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3167         if (status != 0)
3168                 goto out;
3169
3170         /*
3171          * If the fsid didn't change, this is a migration event, not a
3172          * referral.  Cause us to drop into the exception handler, which
3173          * will kick off migration recovery.
3174          */
3175         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3176                 dprintk("%s: server did not return a different fsid for"
3177                         " a referral at %s\n", __func__, name->name);
3178                 status = -NFS4ERR_MOVED;
3179                 goto out;
3180         }
3181         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3182         nfs_fixup_referral_attributes(&locations->fattr);
3183
3184         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3185         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3186         memset(fhandle, 0, sizeof(struct nfs_fh));
3187 out:
3188         if (page)
3189                 __free_page(page);
3190         kfree(locations);
3191         return status;
3192 }
3193
3194 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3195                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3196 {
3197         struct nfs4_getattr_arg args = {
3198                 .fh = fhandle,
3199                 .bitmask = server->attr_bitmask,
3200         };
3201         struct nfs4_getattr_res res = {
3202                 .fattr = fattr,
3203                 .label = label,
3204                 .server = server,
3205         };
3206         struct rpc_message msg = {
3207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3208                 .rpc_argp = &args,
3209                 .rpc_resp = &res,
3210         };
3211
3212         args.bitmask = nfs4_bitmask(server, label);
3213
3214         nfs_fattr_init(fattr);
3215         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3216 }
3217
3218 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3219                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3220 {
3221         struct nfs4_exception exception = { };
3222         int err;
3223         do {
3224                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3225                 trace_nfs4_getattr(server, fhandle, fattr, err);
3226                 err = nfs4_handle_exception(server, err,
3227                                 &exception);
3228         } while (exception.retry);
3229         return err;
3230 }
3231
3232 /*
3233  * The file is not closed if it is opened due to the a request to change
3234  * the size of the file. The open call will not be needed once the
3235  * VFS layer lookup-intents are implemented.
3236  *
3237  * Close is called when the inode is destroyed.
3238  * If we haven't opened the file for O_WRONLY, we
3239  * need to in the size_change case to obtain a stateid.
3240  *
3241  * Got race?
3242  * Because OPEN is always done by name in nfsv4, it is
3243  * possible that we opened a different file by the same
3244  * name.  We can recognize this race condition, but we
3245  * can't do anything about it besides returning an error.
3246  *
3247  * This will be fixed with VFS changes (lookup-intent).
3248  */
3249 static int
3250 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3251                   struct iattr *sattr)
3252 {
3253         struct inode *inode = dentry->d_inode;
3254         struct rpc_cred *cred = NULL;
3255         struct nfs4_state *state = NULL;
3256         struct nfs4_label *label = NULL;
3257         int status;
3258
3259         if (pnfs_ld_layoutret_on_setattr(inode) &&
3260             sattr->ia_valid & ATTR_SIZE &&
3261             sattr->ia_size < i_size_read(inode))
3262                 pnfs_commit_and_return_layout(inode);
3263
3264         nfs_fattr_init(fattr);
3265
3266         /* Deal with open(O_TRUNC) */
3267         if (sattr->ia_valid & ATTR_OPEN)
3268                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3269
3270         /* Optimization: if the end result is no change, don't RPC */
3271         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3272                 return 0;
3273
3274         /* Search for an existing open(O_WRITE) file */
3275         if (sattr->ia_valid & ATTR_FILE) {
3276                 struct nfs_open_context *ctx;
3277
3278                 ctx = nfs_file_open_context(sattr->ia_file);
3279                 if (ctx) {
3280                         cred = ctx->cred;
3281                         state = ctx->state;
3282                 }
3283         }
3284
3285         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3286         if (IS_ERR(label))
3287                 return PTR_ERR(label);
3288
3289         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3290         if (status == 0) {
3291                 nfs_setattr_update_inode(inode, sattr);
3292                 nfs_setsecurity(inode, fattr, label);
3293         }
3294         nfs4_label_free(label);
3295         return status;
3296 }
3297
3298 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3299                 const struct qstr *name, struct nfs_fh *fhandle,
3300                 struct nfs_fattr *fattr, struct nfs4_label *label)
3301 {
3302         struct nfs_server *server = NFS_SERVER(dir);
3303         int                    status;
3304         struct nfs4_lookup_arg args = {
3305                 .bitmask = server->attr_bitmask,
3306                 .dir_fh = NFS_FH(dir),
3307                 .name = name,
3308         };
3309         struct nfs4_lookup_res res = {
3310                 .server = server,
3311                 .fattr = fattr,
3312                 .label = label,
3313                 .fh = fhandle,
3314         };
3315         struct rpc_message msg = {
3316                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3317                 .rpc_argp = &args,
3318                 .rpc_resp = &res,
3319         };
3320
3321         args.bitmask = nfs4_bitmask(server, label);
3322
3323         nfs_fattr_init(fattr);
3324
3325         dprintk("NFS call  lookup %s\n", name->name);
3326         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3327         dprintk("NFS reply lookup: %d\n", status);
3328         return status;
3329 }
3330
3331 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3332 {
3333         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3334                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3335         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3336         fattr->nlink = 2;
3337 }
3338
3339 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3340                                    struct qstr *name, struct nfs_fh *fhandle,
3341                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3342 {
3343         struct nfs4_exception exception = { };
3344         struct rpc_clnt *client = *clnt;
3345         int err;
3346         do {
3347                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3348                 trace_nfs4_lookup(dir, name, err);
3349                 switch (err) {
3350                 case -NFS4ERR_BADNAME:
3351                         err = -ENOENT;
3352                         goto out;
3353                 case -NFS4ERR_MOVED:
3354                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3355                         goto out;
3356                 case -NFS4ERR_WRONGSEC:
3357                         err = -EPERM;
3358                         if (client != *clnt)
3359                                 goto out;
3360                         client = nfs4_negotiate_security(client, dir, name);
3361                         if (IS_ERR(client))
3362                                 return PTR_ERR(client);
3363
3364                         exception.retry = 1;
3365                         break;
3366                 default:
3367                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3368                 }
3369         } while (exception.retry);
3370
3371 out:
3372         if (err == 0)
3373                 *clnt = client;
3374         else if (client != *clnt)
3375                 rpc_shutdown_client(client);
3376
3377         return err;
3378 }
3379
3380 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3381                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3382                             struct nfs4_label *label)
3383 {
3384         int status;
3385         struct rpc_clnt *client = NFS_CLIENT(dir);
3386
3387         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3388         if (client != NFS_CLIENT(dir)) {
3389                 rpc_shutdown_client(client);
3390                 nfs_fixup_secinfo_attributes(fattr);
3391         }
3392         return status;
3393 }
3394
3395 struct rpc_clnt *
3396 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3397                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3398 {
3399         struct rpc_clnt *client = NFS_CLIENT(dir);
3400         int status;
3401
3402         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3403         if (status < 0)
3404                 return ERR_PTR(status);
3405         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3406 }
3407
3408 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3409 {
3410         struct nfs_server *server = NFS_SERVER(inode);
3411         struct nfs4_accessargs args = {
3412                 .fh = NFS_FH(inode),
3413                 .bitmask = server->cache_consistency_bitmask,
3414         };
3415         struct nfs4_accessres res = {
3416                 .server = server,
3417         };
3418         struct rpc_message msg = {
3419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3420                 .rpc_argp = &args,
3421                 .rpc_resp = &res,
3422                 .rpc_cred = entry->cred,
3423         };
3424         int mode = entry->mask;
3425         int status = 0;
3426
3427         /*
3428          * Determine which access bits we want to ask for...
3429          */
3430         if (mode & MAY_READ)
3431                 args.access |= NFS4_ACCESS_READ;
3432         if (S_ISDIR(inode->i_mode)) {
3433                 if (mode & MAY_WRITE)
3434                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3435                 if (mode & MAY_EXEC)
3436                         args.access |= NFS4_ACCESS_LOOKUP;
3437         } else {
3438                 if (mode & MAY_WRITE)
3439                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3440                 if (mode & MAY_EXEC)
3441                         args.access |= NFS4_ACCESS_EXECUTE;
3442         }
3443
3444         res.fattr = nfs_alloc_fattr();
3445         if (res.fattr == NULL)
3446                 return -ENOMEM;
3447
3448         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3449         if (!status) {
3450                 nfs_access_set_mask(entry, res.access);
3451                 nfs_refresh_inode(inode, res.fattr);
3452         }
3453         nfs_free_fattr(res.fattr);
3454         return status;
3455 }
3456
3457 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3458 {
3459         struct nfs4_exception exception = { };
3460         int err;
3461         do {
3462                 err = _nfs4_proc_access(inode, entry);
3463                 trace_nfs4_access(inode, err);
3464                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3465                                 &exception);
3466         } while (exception.retry);
3467         return err;
3468 }
3469
3470 /*
3471  * TODO: For the time being, we don't try to get any attributes
3472  * along with any of the zero-copy operations READ, READDIR,
3473  * READLINK, WRITE.
3474  *
3475  * In the case of the first three, we want to put the GETATTR
3476  * after the read-type operation -- this is because it is hard
3477  * to predict the length of a GETATTR response in v4, and thus
3478  * align the READ data correctly.  This means that the GETATTR
3479  * may end up partially falling into the page cache, and we should
3480  * shift it into the 'tail' of the xdr_buf before processing.
3481  * To do this efficiently, we need to know the total length
3482  * of data received, which doesn't seem to be available outside
3483  * of the RPC layer.
3484  *
3485  * In the case of WRITE, we also want to put the GETATTR after
3486  * the operation -- in this case because we want to make sure
3487  * we get the post-operation mtime and size.
3488  *
3489  * Both of these changes to the XDR layer would in fact be quite
3490  * minor, but I decided to leave them for a subsequent patch.
3491  */
3492 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3493                 unsigned int pgbase, unsigned int pglen)
3494 {
3495         struct nfs4_readlink args = {
3496                 .fh       = NFS_FH(inode),
3497                 .pgbase   = pgbase,
3498                 .pglen    = pglen,
3499                 .pages    = &page,
3500         };
3501         struct nfs4_readlink_res res;
3502         struct rpc_message msg = {
3503                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3504                 .rpc_argp = &args,
3505                 .rpc_resp = &res,
3506         };
3507
3508         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3509 }
3510
3511 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3512                 unsigned int pgbase, unsigned int pglen)
3513 {
3514         struct nfs4_exception exception = { };
3515         int err;
3516         do {
3517                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3518                 trace_nfs4_readlink(inode, err);
3519                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3520                                 &exception);
3521         } while (exception.retry);
3522         return err;
3523 }
3524
3525 /*
3526  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3527  */
3528 static int
3529 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3530                  int flags)
3531 {
3532         struct nfs4_label l, *ilabel = NULL;
3533         struct nfs_open_context *ctx;
3534         struct nfs4_state *state;
3535         int opened = 0;
3536         int status = 0;
3537
3538         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3539         if (IS_ERR(ctx))
3540                 return PTR_ERR(ctx);
3541
3542         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3543
3544         sattr->ia_mode &= ~current_umask();
3545         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3546         if (IS_ERR(state)) {
3547                 status = PTR_ERR(state);
3548                 goto out;
3549         }
3550 out:
3551         nfs4_label_release_security(ilabel);
3552         put_nfs_open_context(ctx);
3553         return status;
3554 }
3555
3556 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3557 {
3558         struct nfs_server *server = NFS_SERVER(dir);
3559         struct nfs_removeargs args = {
3560                 .fh = NFS_FH(dir),
3561                 .name = *name,
3562         };
3563         struct nfs_removeres res = {
3564                 .server = server,
3565         };
3566         struct rpc_message msg = {
3567                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3568                 .rpc_argp = &args,
3569                 .rpc_resp = &res,
3570         };
3571         int status;
3572
3573         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3574         if (status == 0)
3575                 update_changeattr(dir, &res.cinfo);
3576         return status;
3577 }
3578
3579 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3580 {
3581         struct nfs4_exception exception = { };
3582         int err;
3583         do {
3584                 err = _nfs4_proc_remove(dir, name);
3585                 trace_nfs4_remove(dir, name, err);
3586                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3587                                 &exception);
3588         } while (exception.retry);
3589         return err;
3590 }
3591
3592 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3593 {
3594         struct nfs_server *server = NFS_SERVER(dir);
3595         struct nfs_removeargs *args = msg->rpc_argp;
3596         struct nfs_removeres *res = msg->rpc_resp;
3597
3598         res->server = server;
3599         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3600         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3601
3602         nfs_fattr_init(res->dir_attr);
3603 }
3604
3605 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3606 {
3607         nfs4_setup_sequence(NFS_SERVER(data->dir),
3608                         &data->args.seq_args,
3609                         &data->res.seq_res,
3610                         task);
3611 }
3612
3613 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3614 {
3615         struct nfs_unlinkdata *data = task->tk_calldata;
3616         struct nfs_removeres *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,
3621                                     &data->timeout) == -EAGAIN)
3622                 return 0;
3623         update_changeattr(dir, &res->cinfo);
3624         return 1;
3625 }
3626
3627 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3628 {
3629         struct nfs_server *server = NFS_SERVER(dir);
3630         struct nfs_renameargs *arg = msg->rpc_argp;
3631         struct nfs_renameres *res = msg->rpc_resp;
3632
3633         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3634         res->server = server;
3635         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3636 }
3637
3638 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3639 {
3640         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3641                         &data->args.seq_args,
3642                         &data->res.seq_res,
3643                         task);
3644 }
3645
3646 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3647                                  struct inode *new_dir)
3648 {
3649         struct nfs_renamedata *data = task->tk_calldata;
3650         struct nfs_renameres *res = &data->res;
3651
3652         if (!nfs4_sequence_done(task, &res->seq_res))
3653                 return 0;
3654         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3655                 return 0;
3656
3657         update_changeattr(old_dir, &res->old_cinfo);
3658         update_changeattr(new_dir, &res->new_cinfo);
3659         return 1;
3660 }
3661
3662 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3663 {
3664         struct nfs_server *server = NFS_SERVER(inode);
3665         struct nfs4_link_arg arg = {
3666                 .fh     = NFS_FH(inode),
3667                 .dir_fh = NFS_FH(dir),
3668                 .name   = name,
3669                 .bitmask = server->attr_bitmask,
3670         };
3671         struct nfs4_link_res res = {
3672                 .server = server,
3673                 .label = NULL,
3674         };
3675         struct rpc_message msg = {
3676                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3677                 .rpc_argp = &arg,
3678                 .rpc_resp = &res,
3679         };
3680         int status = -ENOMEM;
3681
3682         res.fattr = nfs_alloc_fattr();
3683         if (res.fattr == NULL)
3684                 goto out;
3685
3686         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3687         if (IS_ERR(res.label)) {
3688                 status = PTR_ERR(res.label);
3689                 goto out;
3690         }
3691         arg.bitmask = nfs4_bitmask(server, res.label);
3692
3693         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3694         if (!status) {
3695                 update_changeattr(dir, &res.cinfo);
3696                 status = nfs_post_op_update_inode(inode, res.fattr);
3697                 if (!status)
3698                         nfs_setsecurity(inode, res.fattr, res.label);
3699         }
3700
3701
3702         nfs4_label_free(res.label);
3703
3704 out:
3705         nfs_free_fattr(res.fattr);
3706         return status;
3707 }
3708
3709 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3710 {
3711         struct nfs4_exception exception = { };
3712         int err;
3713         do {
3714                 err = nfs4_handle_exception(NFS_SERVER(inode),
3715                                 _nfs4_proc_link(inode, dir, name),
3716                                 &exception);
3717         } while (exception.retry);
3718         return err;
3719 }
3720
3721 struct nfs4_createdata {
3722         struct rpc_message msg;
3723         struct nfs4_create_arg arg;
3724         struct nfs4_create_res res;
3725         struct nfs_fh fh;
3726         struct nfs_fattr fattr;
3727         struct nfs4_label *label;
3728 };
3729
3730 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3731                 struct qstr *name, struct iattr *sattr, u32 ftype)
3732 {
3733         struct nfs4_createdata *data;
3734
3735         data = kzalloc(sizeof(*data), GFP_KERNEL);
3736         if (data != NULL) {
3737                 struct nfs_server *server = NFS_SERVER(dir);
3738
3739                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3740                 if (IS_ERR(data->label))
3741                         goto out_free;
3742
3743                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3744                 data->msg.rpc_argp = &data->arg;
3745                 data->msg.rpc_resp = &data->res;
3746                 data->arg.dir_fh = NFS_FH(dir);
3747                 data->arg.server = server;
3748                 data->arg.name = name;
3749                 data->arg.attrs = sattr;
3750                 data->arg.ftype = ftype;
3751                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3752                 data->res.server = server;
3753                 data->res.fh = &data->fh;
3754                 data->res.fattr = &data->fattr;
3755                 data->res.label = data->label;
3756                 nfs_fattr_init(data->res.fattr);
3757         }
3758         return data;
3759 out_free:
3760         kfree(data);
3761         return NULL;
3762 }
3763
3764 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3765 {
3766         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3767                                     &data->arg.seq_args, &data->res.seq_res, 1);
3768         if (status == 0) {
3769                 update_changeattr(dir, &data->res.dir_cinfo);
3770                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3771         }
3772         return status;
3773 }
3774
3775 static void nfs4_free_createdata(struct nfs4_createdata *data)
3776 {
3777         nfs4_label_free(data->label);
3778         kfree(data);
3779 }
3780
3781 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3782                 struct page *page, unsigned int len, struct iattr *sattr,
3783                 struct nfs4_label *label)
3784 {
3785         struct nfs4_createdata *data;
3786         int status = -ENAMETOOLONG;
3787
3788         if (len > NFS4_MAXPATHLEN)
3789                 goto out;
3790
3791         status = -ENOMEM;
3792         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3793         if (data == NULL)
3794                 goto out;
3795
3796         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3797         data->arg.u.symlink.pages = &page;
3798         data->arg.u.symlink.len = len;
3799         data->arg.label = label;
3800
3801         status = nfs4_do_create(dir, dentry, data);
3802
3803         nfs4_free_createdata(data);
3804 out:
3805         return status;
3806 }
3807
3808 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3809                 struct page *page, unsigned int len, struct iattr *sattr)
3810 {
3811         struct nfs4_exception exception = { };
3812         struct nfs4_label l, *label = NULL;
3813         int err;
3814
3815         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3816
3817         do {
3818                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3819                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3820                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3821                                 &exception);
3822         } while (exception.retry);
3823
3824         nfs4_label_release_security(label);
3825         return err;
3826 }
3827
3828 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3829                 struct iattr *sattr, struct nfs4_label *label)
3830 {
3831         struct nfs4_createdata *data;
3832         int status = -ENOMEM;
3833
3834         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3835         if (data == NULL)
3836                 goto out;
3837
3838         data->arg.label = label;
3839         status = nfs4_do_create(dir, dentry, data);
3840
3841         nfs4_free_createdata(data);
3842 out:
3843         return status;
3844 }
3845
3846 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3847                 struct iattr *sattr)
3848 {
3849         struct nfs4_exception exception = { };
3850         struct nfs4_label l, *label = NULL;
3851         int err;
3852
3853         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3854
3855         sattr->ia_mode &= ~current_umask();
3856         do {
3857                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3858                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3859                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3860                                 &exception);
3861         } while (exception.retry);
3862         nfs4_label_release_security(label);
3863
3864         return err;
3865 }
3866
3867 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3868                 u64 cookie, struct page **pages, unsigned int count, int plus)
3869 {
3870         struct inode            *dir = dentry->d_inode;
3871         struct nfs4_readdir_arg args = {
3872                 .fh = NFS_FH(dir),
3873                 .pages = pages,
3874                 .pgbase = 0,
3875                 .count = count,
3876                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3877                 .plus = plus,
3878         };
3879         struct nfs4_readdir_res res;
3880         struct rpc_message msg = {
3881                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3882                 .rpc_argp = &args,
3883                 .rpc_resp = &res,
3884                 .rpc_cred = cred,
3885         };
3886         int                     status;
3887
3888         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3889                         dentry,
3890                         (unsigned long long)cookie);
3891         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3892         res.pgbase = args.pgbase;
3893         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3894         if (status >= 0) {
3895                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3896                 status += args.pgbase;
3897         }
3898
3899         nfs_invalidate_atime(dir);
3900
3901         dprintk("%s: returns %d\n", __func__, status);
3902         return status;
3903 }
3904
3905 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3906                 u64 cookie, struct page **pages, unsigned int count, int plus)
3907 {
3908         struct nfs4_exception exception = { };
3909         int err;
3910         do {
3911                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3912                                 pages, count, plus);
3913                 trace_nfs4_readdir(dentry->d_inode, err);
3914                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3915                                 &exception);
3916         } while (exception.retry);
3917         return err;
3918 }
3919
3920 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3921                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3922 {
3923         struct nfs4_createdata *data;
3924         int mode = sattr->ia_mode;
3925         int status = -ENOMEM;
3926
3927         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3928         if (data == NULL)
3929                 goto out;
3930
3931         if (S_ISFIFO(mode))
3932                 data->arg.ftype = NF4FIFO;
3933         else if (S_ISBLK(mode)) {
3934                 data->arg.ftype = NF4BLK;
3935                 data->arg.u.device.specdata1 = MAJOR(rdev);
3936                 data->arg.u.device.specdata2 = MINOR(rdev);
3937         }
3938         else if (S_ISCHR(mode)) {
3939                 data->arg.ftype = NF4CHR;
3940                 data->arg.u.device.specdata1 = MAJOR(rdev);
3941                 data->arg.u.device.specdata2 = MINOR(rdev);
3942         } else if (!S_ISSOCK(mode)) {
3943                 status = -EINVAL;
3944                 goto out_free;
3945         }
3946
3947         data->arg.label = label;
3948         status = nfs4_do_create(dir, dentry, data);
3949 out_free:
3950         nfs4_free_createdata(data);
3951 out:
3952         return status;
3953 }
3954
3955 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3956                 struct iattr *sattr, dev_t rdev)
3957 {
3958         struct nfs4_exception exception = { };
3959         struct nfs4_label l, *label = NULL;
3960         int err;
3961
3962         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3963
3964         sattr->ia_mode &= ~current_umask();
3965         do {
3966                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3967                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3968                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3969                                 &exception);
3970         } while (exception.retry);
3971
3972         nfs4_label_release_security(label);
3973
3974         return err;
3975 }
3976
3977 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3978                  struct nfs_fsstat *fsstat)
3979 {
3980         struct nfs4_statfs_arg args = {
3981                 .fh = fhandle,
3982                 .bitmask = server->attr_bitmask,
3983         };
3984         struct nfs4_statfs_res res = {
3985                 .fsstat = fsstat,
3986         };
3987         struct rpc_message msg = {
3988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3989                 .rpc_argp = &args,
3990                 .rpc_resp = &res,
3991         };
3992
3993         nfs_fattr_init(fsstat->fattr);
3994         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3995 }
3996
3997 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3998 {
3999         struct nfs4_exception exception = { };
4000         int err;
4001         do {
4002                 err = nfs4_handle_exception(server,
4003                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4004                                 &exception);
4005         } while (exception.retry);
4006         return err;
4007 }
4008
4009 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4010                 struct nfs_fsinfo *fsinfo)
4011 {
4012         struct nfs4_fsinfo_arg args = {
4013                 .fh = fhandle,
4014                 .bitmask = server->attr_bitmask,
4015         };
4016         struct nfs4_fsinfo_res res = {
4017                 .fsinfo = fsinfo,
4018         };
4019         struct rpc_message msg = {
4020                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4021                 .rpc_argp = &args,
4022                 .rpc_resp = &res,
4023         };
4024
4025         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4026 }
4027
4028 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4029 {
4030         struct nfs4_exception exception = { };
4031         unsigned long now = jiffies;
4032         int err;
4033
4034         do {
4035                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4036                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4037                 if (err == 0) {
4038                         struct nfs_client *clp = server->nfs_client;
4039
4040                         spin_lock(&clp->cl_lock);
4041                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4042                         clp->cl_last_renewal = now;
4043                         spin_unlock(&clp->cl_lock);
4044                         break;
4045                 }
4046                 err = nfs4_handle_exception(server, err, &exception);
4047         } while (exception.retry);
4048         return err;
4049 }
4050
4051 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4052 {
4053         int error;
4054
4055         nfs_fattr_init(fsinfo->fattr);
4056         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4057         if (error == 0) {
4058                 /* block layout checks this! */
4059                 server->pnfs_blksize = fsinfo->blksize;
4060                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4061         }
4062
4063         return error;
4064 }
4065
4066 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4067                 struct nfs_pathconf *pathconf)
4068 {
4069         struct nfs4_pathconf_arg args = {
4070                 .fh = fhandle,
4071                 .bitmask = server->attr_bitmask,
4072         };
4073         struct nfs4_pathconf_res res = {
4074                 .pathconf = pathconf,
4075         };
4076         struct rpc_message msg = {
4077                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4078                 .rpc_argp = &args,
4079                 .rpc_resp = &res,
4080         };
4081
4082         /* None of the pathconf attributes are mandatory to implement */
4083         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4084                 memset(pathconf, 0, sizeof(*pathconf));
4085                 return 0;
4086         }
4087
4088         nfs_fattr_init(pathconf->fattr);
4089         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4090 }
4091
4092 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4093                 struct nfs_pathconf *pathconf)
4094 {
4095         struct nfs4_exception exception = { };
4096         int err;
4097
4098         do {
4099                 err = nfs4_handle_exception(server,
4100                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4101                                 &exception);
4102         } while (exception.retry);
4103         return err;
4104 }
4105
4106 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4107                 const struct nfs_open_context *ctx,
4108                 const struct nfs_lock_context *l_ctx,
4109                 fmode_t fmode)
4110 {
4111         const struct nfs_lockowner *lockowner = NULL;
4112
4113         if (l_ctx != NULL)
4114                 lockowner = &l_ctx->lockowner;
4115         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4116 }
4117 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4118
4119 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4120                 const struct nfs_open_context *ctx,
4121                 const struct nfs_lock_context *l_ctx,
4122                 fmode_t fmode)
4123 {
4124         nfs4_stateid current_stateid;
4125
4126         /* If the current stateid represents a lost lock, then exit */
4127         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4128                 return true;
4129         return nfs4_stateid_match(stateid, &current_stateid);
4130 }
4131
4132 static bool nfs4_error_stateid_expired(int err)
4133 {
4134         switch (err) {
4135         case -NFS4ERR_DELEG_REVOKED:
4136         case -NFS4ERR_ADMIN_REVOKED:
4137         case -NFS4ERR_BAD_STATEID:
4138         case -NFS4ERR_STALE_STATEID:
4139         case -NFS4ERR_OLD_STATEID:
4140         case -NFS4ERR_OPENMODE:
4141         case -NFS4ERR_EXPIRED:
4142                 return true;
4143         }
4144         return false;
4145 }
4146
4147 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4148 {
4149         nfs_invalidate_atime(hdr->inode);
4150 }
4151
4152 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4153 {
4154         struct nfs_server *server = NFS_SERVER(hdr->inode);
4155
4156         trace_nfs4_read(hdr, task->tk_status);
4157         if (nfs4_async_handle_error(task, server,
4158                                     hdr->args.context->state,
4159                                     NULL) == -EAGAIN) {
4160                 rpc_restart_call_prepare(task);
4161                 return -EAGAIN;
4162         }
4163
4164         __nfs4_read_done_cb(hdr);
4165         if (task->tk_status > 0)
4166                 renew_lease(server, hdr->timestamp);
4167         return 0;
4168 }
4169
4170 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4171                 struct nfs_pgio_args *args)
4172 {
4173
4174         if (!nfs4_error_stateid_expired(task->tk_status) ||
4175                 nfs4_stateid_is_current(&args->stateid,
4176                                 args->context,
4177                                 args->lock_context,
4178                                 FMODE_READ))
4179                 return false;
4180         rpc_restart_call_prepare(task);
4181         return true;
4182 }
4183
4184 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4185 {
4186
4187         dprintk("--> %s\n", __func__);
4188
4189         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4190                 return -EAGAIN;
4191         if (nfs4_read_stateid_changed(task, &hdr->args))
4192                 return -EAGAIN;
4193         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4194                                     nfs4_read_done_cb(task, hdr);
4195 }
4196
4197 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4198                                  struct rpc_message *msg)
4199 {
4200         hdr->timestamp   = jiffies;
4201         hdr->pgio_done_cb = nfs4_read_done_cb;
4202         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4203         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4204 }
4205
4206 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4207                                       struct nfs_pgio_header *hdr)
4208 {
4209         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4210                         &hdr->args.seq_args,
4211                         &hdr->res.seq_res,
4212                         task))
4213                 return 0;
4214         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4215                                 hdr->args.lock_context,
4216                                 hdr->rw_ops->rw_mode) == -EIO)
4217                 return -EIO;
4218         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4219                 return -EIO;
4220         return 0;
4221 }
4222
4223 static int nfs4_write_done_cb(struct rpc_task *task,
4224                               struct nfs_pgio_header *hdr)
4225 {
4226         struct inode *inode = hdr->inode;
4227
4228         trace_nfs4_write(hdr, task->tk_status);
4229         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4230                                     hdr->args.context->state,
4231                                     NULL) == -EAGAIN) {
4232                 rpc_restart_call_prepare(task);
4233                 return -EAGAIN;
4234         }
4235         if (task->tk_status >= 0) {
4236                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4237                 nfs_post_op_update_inode_force_wcc(inode, &hdr->fattr);
4238         }
4239         return 0;
4240 }
4241
4242 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4243                 struct nfs_pgio_args *args)
4244 {
4245
4246         if (!nfs4_error_stateid_expired(task->tk_status) ||
4247                 nfs4_stateid_is_current(&args->stateid,
4248                                 args->context,
4249                                 args->lock_context,
4250                                 FMODE_WRITE))
4251                 return false;
4252         rpc_restart_call_prepare(task);
4253         return true;
4254 }
4255
4256 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4257 {
4258         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4259                 return -EAGAIN;
4260         if (nfs4_write_stateid_changed(task, &hdr->args))
4261                 return -EAGAIN;
4262         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4263                 nfs4_write_done_cb(task, hdr);
4264 }
4265
4266 static
4267 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4268 {
4269         /* Don't request attributes for pNFS or O_DIRECT writes */
4270         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4271                 return false;
4272         /* Otherwise, request attributes if and only if we don't hold
4273          * a delegation
4274          */
4275         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4276 }
4277
4278 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4279                                   struct rpc_message *msg)
4280 {
4281         struct nfs_server *server = NFS_SERVER(hdr->inode);
4282
4283         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4284                 hdr->args.bitmask = NULL;
4285                 hdr->res.fattr = NULL;
4286         } else
4287                 hdr->args.bitmask = server->cache_consistency_bitmask;
4288
4289         if (!hdr->pgio_done_cb)
4290                 hdr->pgio_done_cb = nfs4_write_done_cb;
4291         hdr->res.server = server;
4292         hdr->timestamp   = jiffies;
4293
4294         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4295         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4296 }
4297
4298 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4299 {
4300         nfs4_setup_sequence(NFS_SERVER(data->inode),
4301                         &data->args.seq_args,
4302                         &data->res.seq_res,
4303                         task);
4304 }
4305
4306 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4307 {
4308         struct inode *inode = data->inode;
4309
4310         trace_nfs4_commit(data, task->tk_status);
4311         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4312                                     NULL, NULL) == -EAGAIN) {
4313                 rpc_restart_call_prepare(task);
4314                 return -EAGAIN;
4315         }
4316         return 0;
4317 }
4318
4319 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4320 {
4321         if (!nfs4_sequence_done(task, &data->res.seq_res))
4322                 return -EAGAIN;
4323         return data->commit_done_cb(task, data);
4324 }
4325
4326 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4327 {
4328         struct nfs_server *server = NFS_SERVER(data->inode);
4329
4330         if (data->commit_done_cb == NULL)
4331                 data->commit_done_cb = nfs4_commit_done_cb;
4332         data->res.server = server;
4333         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4334         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4335 }
4336
4337 struct nfs4_renewdata {
4338         struct nfs_client       *client;
4339         unsigned long           timestamp;
4340 };
4341
4342 /*
4343  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4344  * standalone procedure for queueing an asynchronous RENEW.
4345  */
4346 static void nfs4_renew_release(void *calldata)
4347 {
4348         struct nfs4_renewdata *data = calldata;
4349         struct nfs_client *clp = data->client;
4350
4351         if (atomic_read(&clp->cl_count) > 1)
4352                 nfs4_schedule_state_renewal(clp);
4353         nfs_put_client(clp);
4354         kfree(data);
4355 }
4356
4357 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4358 {
4359         struct nfs4_renewdata *data = calldata;
4360         struct nfs_client *clp = data->client;
4361         unsigned long timestamp = data->timestamp;
4362
4363         trace_nfs4_renew_async(clp, task->tk_status);
4364         switch (task->tk_status) {
4365         case 0:
4366                 break;
4367         case -NFS4ERR_LEASE_MOVED:
4368                 nfs4_schedule_lease_moved_recovery(clp);
4369                 break;
4370         default:
4371                 /* Unless we're shutting down, schedule state recovery! */
4372                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4373                         return;
4374                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4375                         nfs4_schedule_lease_recovery(clp);
4376                         return;
4377                 }
4378                 nfs4_schedule_path_down_recovery(clp);
4379         }
4380         do_renew_lease(clp, timestamp);
4381 }
4382
4383 static const struct rpc_call_ops nfs4_renew_ops = {
4384         .rpc_call_done = nfs4_renew_done,
4385         .rpc_release = nfs4_renew_release,
4386 };
4387
4388 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4389 {
4390         struct rpc_message msg = {
4391                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4392                 .rpc_argp       = clp,
4393                 .rpc_cred       = cred,
4394         };
4395         struct nfs4_renewdata *data;
4396
4397         if (renew_flags == 0)
4398                 return 0;
4399         if (!atomic_inc_not_zero(&clp->cl_count))
4400                 return -EIO;
4401         data = kmalloc(sizeof(*data), GFP_NOFS);
4402         if (data == NULL)
4403                 return -ENOMEM;
4404         data->client = clp;
4405         data->timestamp = jiffies;
4406         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4407                         &nfs4_renew_ops, data);
4408 }
4409
4410 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4411 {
4412         struct rpc_message msg = {
4413                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4414                 .rpc_argp       = clp,
4415                 .rpc_cred       = cred,
4416         };
4417         unsigned long now = jiffies;
4418         int status;
4419
4420         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4421         if (status < 0)
4422                 return status;
4423         do_renew_lease(clp, now);
4424         return 0;
4425 }
4426
4427 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4428 {
4429         return server->caps & NFS_CAP_ACLS;
4430 }
4431
4432 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4433  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4434  * the stack.
4435  */
4436 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4437
4438 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4439                 struct page **pages, unsigned int *pgbase)
4440 {
4441         struct page *newpage, **spages;
4442         int rc = 0;
4443         size_t len;
4444         spages = pages;
4445
4446         do {
4447                 len = min_t(size_t, PAGE_SIZE, buflen);
4448                 newpage = alloc_page(GFP_KERNEL);
4449
4450                 if (newpage == NULL)
4451                         goto unwind;
4452                 memcpy(page_address(newpage), buf, len);
4453                 buf += len;
4454                 buflen -= len;
4455                 *pages++ = newpage;
4456                 rc++;
4457         } while (buflen != 0);
4458
4459         return rc;
4460
4461 unwind:
4462         for(; rc > 0; rc--)
4463                 __free_page(spages[rc-1]);
4464         return -ENOMEM;
4465 }
4466
4467 struct nfs4_cached_acl {
4468         int cached;
4469         size_t len;
4470         char data[0];
4471 };
4472
4473 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4474 {
4475         struct nfs_inode *nfsi = NFS_I(inode);
4476
4477         spin_lock(&inode->i_lock);
4478         kfree(nfsi->nfs4_acl);
4479         nfsi->nfs4_acl = acl;
4480         spin_unlock(&inode->i_lock);
4481 }
4482
4483 static void nfs4_zap_acl_attr(struct inode *inode)
4484 {
4485         nfs4_set_cached_acl(inode, NULL);
4486 }
4487
4488 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4489 {
4490         struct nfs_inode *nfsi = NFS_I(inode);
4491         struct nfs4_cached_acl *acl;
4492         int ret = -ENOENT;
4493
4494         spin_lock(&inode->i_lock);
4495         acl = nfsi->nfs4_acl;
4496         if (acl == NULL)
4497                 goto out;
4498         if (buf == NULL) /* user is just asking for length */
4499                 goto out_len;
4500         if (acl->cached == 0)
4501                 goto out;
4502         ret = -ERANGE; /* see getxattr(2) man page */
4503         if (acl->len > buflen)
4504                 goto out;
4505         memcpy(buf, acl->data, acl->len);
4506 out_len:
4507         ret = acl->len;
4508 out:
4509         spin_unlock(&inode->i_lock);
4510         return ret;
4511 }
4512
4513 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4514 {
4515         struct nfs4_cached_acl *acl;
4516         size_t buflen = sizeof(*acl) + acl_len;
4517
4518         if (buflen <= PAGE_SIZE) {
4519                 acl = kmalloc(buflen, GFP_KERNEL);
4520                 if (acl == NULL)
4521                         goto out;
4522                 acl->cached = 1;
4523                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4524         } else {
4525                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4526                 if (acl == NULL)
4527                         goto out;
4528                 acl->cached = 0;
4529         }
4530         acl->len = acl_len;
4531 out:
4532         nfs4_set_cached_acl(inode, acl);
4533 }
4534
4535 /*
4536  * The getxattr API returns the required buffer length when called with a
4537  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4538  * the required buf.  On a NULL buf, we send a page of data to the server
4539  * guessing that the ACL request can be serviced by a page. If so, we cache
4540  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4541  * the cache. If not so, we throw away the page, and cache the required
4542  * length. The next getxattr call will then produce another round trip to
4543  * the server, this time with the input buf of the required size.
4544  */
4545 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4546 {
4547         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4548         struct nfs_getaclargs args = {
4549                 .fh = NFS_FH(inode),
4550                 .acl_pages = pages,
4551                 .acl_len = buflen,
4552         };
4553         struct nfs_getaclres res = {
4554                 .acl_len = buflen,
4555         };
4556         struct rpc_message msg = {
4557                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4558                 .rpc_argp = &args,
4559                 .rpc_resp = &res,
4560         };
4561         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4562         int ret = -ENOMEM, i;
4563
4564         /* As long as we're doing a round trip to the server anyway,
4565          * let's be prepared for a page of acl data. */
4566         if (npages == 0)
4567                 npages = 1;
4568         if (npages > ARRAY_SIZE(pages))
4569                 return -ERANGE;
4570
4571         for (i = 0; i < npages; i++) {
4572                 pages[i] = alloc_page(GFP_KERNEL);
4573                 if (!pages[i])
4574                         goto out_free;
4575         }
4576
4577         /* for decoding across pages */
4578         res.acl_scratch = alloc_page(GFP_KERNEL);
4579         if (!res.acl_scratch)
4580                 goto out_free;
4581
4582         args.acl_len = npages * PAGE_SIZE;
4583         args.acl_pgbase = 0;
4584
4585         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4586                 __func__, buf, buflen, npages, args.acl_len);
4587         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4588                              &msg, &args.seq_args, &res.seq_res, 0);
4589         if (ret)
4590                 goto out_free;
4591
4592         /* Handle the case where the passed-in buffer is too short */
4593         if (res.acl_flags & NFS4_ACL_TRUNC) {
4594                 /* Did the user only issue a request for the acl length? */
4595                 if (buf == NULL)
4596                         goto out_ok;
4597                 ret = -ERANGE;
4598                 goto out_free;
4599         }
4600         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4601         if (buf) {
4602                 if (res.acl_len > buflen) {
4603                         ret = -ERANGE;
4604                         goto out_free;
4605                 }
4606                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4607         }
4608 out_ok:
4609         ret = res.acl_len;
4610 out_free:
4611         for (i = 0; i < npages; i++)
4612                 if (pages[i])
4613                         __free_page(pages[i]);
4614         if (res.acl_scratch)
4615                 __free_page(res.acl_scratch);
4616         return ret;
4617 }
4618
4619 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4620 {
4621         struct nfs4_exception exception = { };
4622         ssize_t ret;
4623         do {
4624                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4625                 trace_nfs4_get_acl(inode, ret);
4626                 if (ret >= 0)
4627                         break;
4628                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4629         } while (exception.retry);
4630         return ret;
4631 }
4632
4633 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4634 {
4635         struct nfs_server *server = NFS_SERVER(inode);
4636         int ret;
4637
4638         if (!nfs4_server_supports_acls(server))
4639                 return -EOPNOTSUPP;
4640         ret = nfs_revalidate_inode(server, inode);
4641         if (ret < 0)
4642                 return ret;
4643         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4644                 nfs_zap_acl_cache(inode);
4645         ret = nfs4_read_cached_acl(inode, buf, buflen);
4646         if (ret != -ENOENT)
4647                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4648                  * but no cached acl data, just the acl length */
4649                 return ret;
4650         return nfs4_get_acl_uncached(inode, buf, buflen);
4651 }
4652
4653 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4654 {
4655         struct nfs_server *server = NFS_SERVER(inode);
4656         struct page *pages[NFS4ACL_MAXPAGES];
4657         struct nfs_setaclargs arg = {
4658                 .fh             = NFS_FH(inode),
4659                 .acl_pages      = pages,
4660                 .acl_len        = buflen,
4661         };
4662         struct nfs_setaclres res;
4663         struct rpc_message msg = {
4664                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4665                 .rpc_argp       = &arg,
4666                 .rpc_resp       = &res,
4667         };
4668         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4669         int ret, i;
4670
4671         if (!nfs4_server_supports_acls(server))
4672                 return -EOPNOTSUPP;
4673         if (npages > ARRAY_SIZE(pages))
4674                 return -ERANGE;
4675         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4676         if (i < 0)
4677                 return i;
4678         nfs4_inode_return_delegation(inode);
4679         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4680
4681         /*
4682          * Free each page after tx, so the only ref left is
4683          * held by the network stack
4684          */
4685         for (; i > 0; i--)
4686                 put_page(pages[i-1]);
4687
4688         /*
4689          * Acl update can result in inode attribute update.
4690          * so mark the attribute cache invalid.
4691          */
4692         spin_lock(&inode->i_lock);
4693         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4694         spin_unlock(&inode->i_lock);
4695         nfs_access_zap_cache(inode);
4696         nfs_zap_acl_cache(inode);
4697         return ret;
4698 }
4699
4700 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4701 {
4702         struct nfs4_exception exception = { };
4703         int err;
4704         do {
4705                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4706                 trace_nfs4_set_acl(inode, err);
4707                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4708                                 &exception);
4709         } while (exception.retry);
4710         return err;
4711 }
4712
4713 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4714 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4715                                         size_t buflen)
4716 {
4717         struct nfs_server *server = NFS_SERVER(inode);
4718         struct nfs_fattr fattr;
4719         struct nfs4_label label = {0, 0, buflen, buf};
4720
4721         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4722         struct nfs4_getattr_arg arg = {
4723                 .fh             = NFS_FH(inode),
4724                 .bitmask        = bitmask,
4725         };
4726         struct nfs4_getattr_res res = {
4727                 .fattr          = &fattr,
4728                 .label          = &label,
4729                 .server         = server,
4730         };
4731         struct rpc_message msg = {
4732                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4733                 .rpc_argp       = &arg,
4734                 .rpc_resp       = &res,
4735         };
4736         int ret;
4737
4738         nfs_fattr_init(&fattr);
4739
4740         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4741         if (ret)
4742                 return ret;
4743         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4744                 return -ENOENT;
4745         if (buflen < label.len)
4746                 return -ERANGE;
4747         return 0;
4748 }
4749
4750 static int nfs4_get_security_label(struct inode *inode, void *buf,
4751                                         size_t buflen)
4752 {
4753         struct nfs4_exception exception = { };
4754         int err;
4755
4756         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4757                 return -EOPNOTSUPP;
4758
4759         do {
4760                 err = _nfs4_get_security_label(inode, buf, buflen);
4761                 trace_nfs4_get_security_label(inode, err);
4762                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4763                                 &exception);
4764         } while (exception.retry);
4765         return err;
4766 }
4767
4768 static int _nfs4_do_set_security_label(struct inode *inode,
4769                 struct nfs4_label *ilabel,
4770                 struct nfs_fattr *fattr,
4771                 struct nfs4_label *olabel)
4772 {
4773
4774         struct iattr sattr = {0};
4775         struct nfs_server *server = NFS_SERVER(inode);
4776         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4777         struct nfs_setattrargs arg = {
4778                 .fh             = NFS_FH(inode),
4779                 .iap            = &sattr,
4780                 .server         = server,
4781                 .bitmask        = bitmask,
4782                 .label          = ilabel,
4783         };
4784         struct nfs_setattrres res = {
4785                 .fattr          = fattr,
4786                 .label          = olabel,
4787                 .server         = server,
4788         };
4789         struct rpc_message msg = {
4790                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4791                 .rpc_argp       = &arg,
4792                 .rpc_resp       = &res,
4793         };
4794         int status;
4795
4796         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4797
4798         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4799         if (status)
4800                 dprintk("%s failed: %d\n", __func__, status);
4801
4802         return status;
4803 }
4804
4805 static int nfs4_do_set_security_label(struct inode *inode,
4806                 struct nfs4_label *ilabel,
4807                 struct nfs_fattr *fattr,
4808                 struct nfs4_label *olabel)
4809 {
4810         struct nfs4_exception exception = { };
4811         int err;
4812
4813         do {
4814                 err = _nfs4_do_set_security_label(inode, ilabel,
4815                                 fattr, olabel);
4816                 trace_nfs4_set_security_label(inode, err);
4817                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4818                                 &exception);
4819         } while (exception.retry);
4820         return err;
4821 }
4822
4823 static int
4824 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4825 {
4826         struct nfs4_label ilabel, *olabel = NULL;
4827         struct nfs_fattr fattr;
4828         struct rpc_cred *cred;
4829         struct inode *inode = dentry->d_inode;
4830         int status;
4831
4832         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4833                 return -EOPNOTSUPP;
4834
4835         nfs_fattr_init(&fattr);
4836
4837         ilabel.pi = 0;
4838         ilabel.lfs = 0;
4839         ilabel.label = (char *)buf;
4840         ilabel.len = buflen;
4841
4842         cred = rpc_lookup_cred();
4843         if (IS_ERR(cred))
4844                 return PTR_ERR(cred);
4845
4846         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4847         if (IS_ERR(olabel)) {
4848                 status = -PTR_ERR(olabel);
4849                 goto out;
4850         }
4851
4852         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4853         if (status == 0)
4854                 nfs_setsecurity(inode, &fattr, olabel);
4855
4856         nfs4_label_free(olabel);
4857 out:
4858         put_rpccred(cred);
4859         return status;
4860 }
4861 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4862
4863
4864 static int
4865 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4866                         struct nfs4_state *state, long *timeout)
4867 {
4868         struct nfs_client *clp = server->nfs_client;
4869
4870         if (task->tk_status >= 0)
4871                 return 0;
4872         switch(task->tk_status) {
4873                 case -NFS4ERR_DELEG_REVOKED:
4874                 case -NFS4ERR_ADMIN_REVOKED:
4875                 case -NFS4ERR_BAD_STATEID:
4876                 case -NFS4ERR_OPENMODE:
4877                         if (state == NULL)
4878                                 break;
4879                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4880                                 goto recovery_failed;
4881                         goto wait_on_recovery;
4882                 case -NFS4ERR_EXPIRED:
4883                         if (state != NULL) {
4884                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4885                                         goto recovery_failed;
4886                         }
4887                 case -NFS4ERR_STALE_STATEID:
4888                 case -NFS4ERR_STALE_CLIENTID:
4889                         nfs4_schedule_lease_recovery(clp);
4890                         goto wait_on_recovery;
4891                 case -NFS4ERR_MOVED:
4892                         if (nfs4_schedule_migration_recovery(server) < 0)
4893                                 goto recovery_failed;
4894                         goto wait_on_recovery;
4895                 case -NFS4ERR_LEASE_MOVED:
4896                         nfs4_schedule_lease_moved_recovery(clp);
4897                         goto wait_on_recovery;
4898 #if defined(CONFIG_NFS_V4_1)
4899                 case -NFS4ERR_BADSESSION:
4900                 case -NFS4ERR_BADSLOT:
4901                 case -NFS4ERR_BAD_HIGH_SLOT:
4902                 case -NFS4ERR_DEADSESSION:
4903                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4904                 case -NFS4ERR_SEQ_FALSE_RETRY:
4905                 case -NFS4ERR_SEQ_MISORDERED:
4906                         dprintk("%s ERROR %d, Reset session\n", __func__,
4907                                 task->tk_status);
4908                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4909                         goto wait_on_recovery;
4910 #endif /* CONFIG_NFS_V4_1 */
4911                 case -NFS4ERR_DELAY:
4912                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4913                         rpc_delay(task, nfs4_update_delay(timeout));
4914                         goto restart_call;
4915                 case -NFS4ERR_GRACE:
4916                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4917                 case -NFS4ERR_RETRY_UNCACHED_REP:
4918                 case -NFS4ERR_OLD_STATEID:
4919                         goto restart_call;
4920         }
4921         task->tk_status = nfs4_map_errors(task->tk_status);
4922         return 0;
4923 recovery_failed:
4924         task->tk_status = -EIO;
4925         return 0;
4926 wait_on_recovery:
4927         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4928         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4929                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4930         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4931                 goto recovery_failed;
4932 restart_call:
4933         task->tk_status = 0;
4934         return -EAGAIN;
4935 }
4936
4937 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4938                                     nfs4_verifier *bootverf)
4939 {
4940         __be32 verf[2];
4941
4942         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4943                 /* An impossible timestamp guarantees this value
4944                  * will never match a generated boot time. */
4945                 verf[0] = 0;
4946                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4947         } else {
4948                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4949                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4950                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4951         }
4952         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4953 }
4954
4955 static unsigned int
4956 nfs4_init_nonuniform_client_string(struct nfs_client *clp,
4957                                    char *buf, size_t len)
4958 {
4959         unsigned int result;
4960
4961         if (clp->cl_owner_id != NULL)
4962                 return strlcpy(buf, clp->cl_owner_id, len);
4963
4964         rcu_read_lock();
4965         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4966                                 clp->cl_ipaddr,
4967                                 rpc_peeraddr2str(clp->cl_rpcclient,
4968                                                         RPC_DISPLAY_ADDR),
4969                                 rpc_peeraddr2str(clp->cl_rpcclient,
4970                                                         RPC_DISPLAY_PROTO));
4971         rcu_read_unlock();
4972         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4973         return result;
4974 }
4975
4976 static unsigned int
4977 nfs4_init_uniform_client_string(struct nfs_client *clp,
4978                                 char *buf, size_t len)
4979 {
4980         const char *nodename = clp->cl_rpcclient->cl_nodename;
4981         unsigned int result;
4982
4983         if (clp->cl_owner_id != NULL)
4984                 return strlcpy(buf, clp->cl_owner_id, len);
4985
4986         if (nfs4_client_id_uniquifier[0] != '\0')
4987                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4988                                 clp->rpc_ops->version,
4989                                 clp->cl_minorversion,
4990                                 nfs4_client_id_uniquifier,
4991                                 nodename);
4992         else
4993                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s",
4994                                 clp->rpc_ops->version, clp->cl_minorversion,
4995                                 nodename);
4996         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4997         return result;
4998 }
4999
5000 /*
5001  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5002  * services.  Advertise one based on the address family of the
5003  * clientaddr.
5004  */
5005 static unsigned int
5006 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5007 {
5008         if (strchr(clp->cl_ipaddr, ':') != NULL)
5009                 return scnprintf(buf, len, "tcp6");
5010         else
5011                 return scnprintf(buf, len, "tcp");
5012 }
5013
5014 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5015 {
5016         struct nfs4_setclientid *sc = calldata;
5017
5018         if (task->tk_status == 0)
5019                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5020 }
5021
5022 static const struct rpc_call_ops nfs4_setclientid_ops = {
5023         .rpc_call_done = nfs4_setclientid_done,
5024 };
5025
5026 /**
5027  * nfs4_proc_setclientid - Negotiate client ID
5028  * @clp: state data structure
5029  * @program: RPC program for NFSv4 callback service
5030  * @port: IP port number for NFS4 callback service
5031  * @cred: RPC credential to use for this call
5032  * @res: where to place the result
5033  *
5034  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5035  */
5036 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5037                 unsigned short port, struct rpc_cred *cred,
5038                 struct nfs4_setclientid_res *res)
5039 {
5040         nfs4_verifier sc_verifier;
5041         struct nfs4_setclientid setclientid = {
5042                 .sc_verifier = &sc_verifier,
5043                 .sc_prog = program,
5044                 .sc_cb_ident = clp->cl_cb_ident,
5045         };
5046         struct rpc_message msg = {
5047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5048                 .rpc_argp = &setclientid,
5049                 .rpc_resp = res,
5050                 .rpc_cred = cred,
5051         };
5052         struct rpc_task *task;
5053         struct rpc_task_setup task_setup_data = {
5054                 .rpc_client = clp->cl_rpcclient,
5055                 .rpc_message = &msg,
5056                 .callback_ops = &nfs4_setclientid_ops,
5057                 .callback_data = &setclientid,
5058                 .flags = RPC_TASK_TIMEOUT,
5059         };
5060         int status;
5061
5062         /* nfs_client_id4 */
5063         nfs4_init_boot_verifier(clp, &sc_verifier);
5064         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5065                 setclientid.sc_name_len =
5066                                 nfs4_init_uniform_client_string(clp,
5067                                                 setclientid.sc_name,
5068                                                 sizeof(setclientid.sc_name));
5069         else
5070                 setclientid.sc_name_len =
5071                                 nfs4_init_nonuniform_client_string(clp,
5072                                                 setclientid.sc_name,
5073                                                 sizeof(setclientid.sc_name));
5074         /* cb_client4 */
5075         setclientid.sc_netid_len =
5076                                 nfs4_init_callback_netid(clp,
5077                                                 setclientid.sc_netid,
5078                                                 sizeof(setclientid.sc_netid));
5079         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5080                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5081                                 clp->cl_ipaddr, port >> 8, port & 255);
5082
5083         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5084                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5085                 setclientid.sc_name_len, setclientid.sc_name);
5086         task = rpc_run_task(&task_setup_data);
5087         if (IS_ERR(task)) {
5088                 status = PTR_ERR(task);
5089                 goto out;
5090         }
5091         status = task->tk_status;
5092         if (setclientid.sc_cred) {
5093                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5094                 put_rpccred(setclientid.sc_cred);
5095         }
5096         rpc_put_task(task);
5097 out:
5098         trace_nfs4_setclientid(clp, status);
5099         dprintk("NFS reply setclientid: %d\n", status);
5100         return status;
5101 }
5102
5103 /**
5104  * nfs4_proc_setclientid_confirm - Confirm client ID
5105  * @clp: state data structure
5106  * @res: result of a previous SETCLIENTID
5107  * @cred: RPC credential to use for this call
5108  *
5109  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5110  */
5111 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5112                 struct nfs4_setclientid_res *arg,
5113                 struct rpc_cred *cred)
5114 {
5115         struct rpc_message msg = {
5116                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5117                 .rpc_argp = arg,
5118                 .rpc_cred = cred,
5119         };
5120         int status;
5121
5122         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5123                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5124                 clp->cl_clientid);
5125         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5126         trace_nfs4_setclientid_confirm(clp, status);
5127         dprintk("NFS reply setclientid_confirm: %d\n", status);
5128         return status;
5129 }
5130
5131 struct nfs4_delegreturndata {
5132         struct nfs4_delegreturnargs args;
5133         struct nfs4_delegreturnres res;
5134         struct nfs_fh fh;
5135         nfs4_stateid stateid;
5136         unsigned long timestamp;
5137         struct nfs_fattr fattr;
5138         int rpc_status;
5139         struct inode *inode;
5140         bool roc;
5141         u32 roc_barrier;
5142 };
5143
5144 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5145 {
5146         struct nfs4_delegreturndata *data = calldata;
5147
5148         if (!nfs4_sequence_done(task, &data->res.seq_res))
5149                 return;
5150
5151         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5152         switch (task->tk_status) {
5153         case 0:
5154                 renew_lease(data->res.server, data->timestamp);
5155         case -NFS4ERR_ADMIN_REVOKED:
5156         case -NFS4ERR_DELEG_REVOKED:
5157         case -NFS4ERR_BAD_STATEID:
5158         case -NFS4ERR_OLD_STATEID:
5159         case -NFS4ERR_STALE_STATEID:
5160         case -NFS4ERR_EXPIRED:
5161                 task->tk_status = 0;
5162                 if (data->roc)
5163                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5164                 break;
5165         default:
5166                 if (nfs4_async_handle_error(task, data->res.server,
5167                                             NULL, NULL) == -EAGAIN) {
5168                         rpc_restart_call_prepare(task);
5169                         return;
5170                 }
5171         }
5172         data->rpc_status = task->tk_status;
5173 }
5174
5175 static void nfs4_delegreturn_release(void *calldata)
5176 {
5177         struct nfs4_delegreturndata *data = calldata;
5178         struct inode *inode = data->inode;
5179
5180         if (inode) {
5181                 if (data->roc)
5182                         pnfs_roc_release(inode);
5183                 nfs_iput_and_deactive(inode);
5184         }
5185         kfree(calldata);
5186 }
5187
5188 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5189 {
5190         struct nfs4_delegreturndata *d_data;
5191
5192         d_data = (struct nfs4_delegreturndata *)data;
5193
5194         if (d_data->roc &&
5195             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5196                 return;
5197
5198         nfs4_setup_sequence(d_data->res.server,
5199                         &d_data->args.seq_args,
5200                         &d_data->res.seq_res,
5201                         task);
5202 }
5203
5204 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5205         .rpc_call_prepare = nfs4_delegreturn_prepare,
5206         .rpc_call_done = nfs4_delegreturn_done,
5207         .rpc_release = nfs4_delegreturn_release,
5208 };
5209
5210 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5211 {
5212         struct nfs4_delegreturndata *data;
5213         struct nfs_server *server = NFS_SERVER(inode);
5214         struct rpc_task *task;
5215         struct rpc_message msg = {
5216                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5217                 .rpc_cred = cred,
5218         };
5219         struct rpc_task_setup task_setup_data = {
5220                 .rpc_client = server->client,
5221                 .rpc_message = &msg,
5222                 .callback_ops = &nfs4_delegreturn_ops,
5223                 .flags = RPC_TASK_ASYNC,
5224         };
5225         int status = 0;
5226
5227         data = kzalloc(sizeof(*data), GFP_NOFS);
5228         if (data == NULL)
5229                 return -ENOMEM;
5230         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5231         data->args.fhandle = &data->fh;
5232         data->args.stateid = &data->stateid;
5233         data->args.bitmask = server->cache_consistency_bitmask;
5234         nfs_copy_fh(&data->fh, NFS_FH(inode));
5235         nfs4_stateid_copy(&data->stateid, stateid);
5236         data->res.fattr = &data->fattr;
5237         data->res.server = server;
5238         nfs_fattr_init(data->res.fattr);
5239         data->timestamp = jiffies;
5240         data->rpc_status = 0;
5241         data->inode = nfs_igrab_and_active(inode);
5242         if (data->inode)
5243                 data->roc = nfs4_roc(inode);
5244
5245         task_setup_data.callback_data = data;
5246         msg.rpc_argp = &data->args;
5247         msg.rpc_resp = &data->res;
5248         task = rpc_run_task(&task_setup_data);
5249         if (IS_ERR(task))
5250                 return PTR_ERR(task);
5251         if (!issync)
5252                 goto out;
5253         status = nfs4_wait_for_completion_rpc_task(task);
5254         if (status != 0)
5255                 goto out;
5256         status = data->rpc_status;
5257         if (status == 0)
5258                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5259         else
5260                 nfs_refresh_inode(inode, &data->fattr);
5261 out:
5262         rpc_put_task(task);
5263         return status;
5264 }
5265
5266 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5267 {
5268         struct nfs_server *server = NFS_SERVER(inode);
5269         struct nfs4_exception exception = { };
5270         int err;
5271         do {
5272                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5273                 trace_nfs4_delegreturn(inode, err);
5274                 switch (err) {
5275                         case -NFS4ERR_STALE_STATEID:
5276                         case -NFS4ERR_EXPIRED:
5277                         case 0:
5278                                 return 0;
5279                 }
5280                 err = nfs4_handle_exception(server, err, &exception);
5281         } while (exception.retry);
5282         return err;
5283 }
5284
5285 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5286 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5287
5288 /*
5289  * sleep, with exponential backoff, and retry the LOCK operation.
5290  */
5291 static unsigned long
5292 nfs4_set_lock_task_retry(unsigned long timeout)
5293 {
5294         freezable_schedule_timeout_killable_unsafe(timeout);
5295         timeout <<= 1;
5296         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5297                 return NFS4_LOCK_MAXTIMEOUT;
5298         return timeout;
5299 }
5300
5301 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5302 {
5303         struct inode *inode = state->inode;
5304         struct nfs_server *server = NFS_SERVER(inode);
5305         struct nfs_client *clp = server->nfs_client;
5306         struct nfs_lockt_args arg = {
5307                 .fh = NFS_FH(inode),
5308                 .fl = request,
5309         };
5310         struct nfs_lockt_res res = {
5311                 .denied = request,
5312         };
5313         struct rpc_message msg = {
5314                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5315                 .rpc_argp       = &arg,
5316                 .rpc_resp       = &res,
5317                 .rpc_cred       = state->owner->so_cred,
5318         };
5319         struct nfs4_lock_state *lsp;
5320         int status;
5321
5322         arg.lock_owner.clientid = clp->cl_clientid;
5323         status = nfs4_set_lock_state(state, request);
5324         if (status != 0)
5325                 goto out;
5326         lsp = request->fl_u.nfs4_fl.owner;
5327         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5328         arg.lock_owner.s_dev = server->s_dev;
5329         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5330         switch (status) {
5331                 case 0:
5332                         request->fl_type = F_UNLCK;
5333                         break;
5334                 case -NFS4ERR_DENIED:
5335                         status = 0;
5336         }
5337         request->fl_ops->fl_release_private(request);
5338         request->fl_ops = NULL;
5339 out:
5340         return status;
5341 }
5342
5343 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5344 {
5345         struct nfs4_exception exception = { };
5346         int err;
5347
5348         do {
5349                 err = _nfs4_proc_getlk(state, cmd, request);
5350                 trace_nfs4_get_lock(request, state, cmd, err);
5351                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5352                                 &exception);
5353         } while (exception.retry);
5354         return err;
5355 }
5356
5357 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5358 {
5359         int res = 0;
5360         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5361                 case FL_POSIX:
5362                         res = posix_lock_file_wait(file, fl);
5363                         break;
5364                 case FL_FLOCK:
5365                         res = flock_lock_file_wait(file, fl);
5366                         break;
5367                 default:
5368                         BUG();
5369         }
5370         return res;
5371 }
5372
5373 struct nfs4_unlockdata {
5374         struct nfs_locku_args arg;
5375         struct nfs_locku_res res;
5376         struct nfs4_lock_state *lsp;
5377         struct nfs_open_context *ctx;
5378         struct file_lock fl;
5379         const struct nfs_server *server;
5380         unsigned long timestamp;
5381 };
5382
5383 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5384                 struct nfs_open_context *ctx,
5385                 struct nfs4_lock_state *lsp,
5386                 struct nfs_seqid *seqid)
5387 {
5388         struct nfs4_unlockdata *p;
5389         struct inode *inode = lsp->ls_state->inode;
5390
5391         p = kzalloc(sizeof(*p), GFP_NOFS);
5392         if (p == NULL)
5393                 return NULL;
5394         p->arg.fh = NFS_FH(inode);
5395         p->arg.fl = &p->fl;
5396         p->arg.seqid = seqid;
5397         p->res.seqid = seqid;
5398         p->lsp = lsp;
5399         atomic_inc(&lsp->ls_count);
5400         /* Ensure we don't close file until we're done freeing locks! */
5401         p->ctx = get_nfs_open_context(ctx);
5402         memcpy(&p->fl, fl, sizeof(p->fl));
5403         p->server = NFS_SERVER(inode);
5404         return p;
5405 }
5406
5407 static void nfs4_locku_release_calldata(void *data)
5408 {
5409         struct nfs4_unlockdata *calldata = data;
5410         nfs_free_seqid(calldata->arg.seqid);
5411         nfs4_put_lock_state(calldata->lsp);
5412         put_nfs_open_context(calldata->ctx);
5413         kfree(calldata);
5414 }
5415
5416 static void nfs4_locku_done(struct rpc_task *task, void *data)
5417 {
5418         struct nfs4_unlockdata *calldata = data;
5419
5420         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5421                 return;
5422         switch (task->tk_status) {
5423                 case 0:
5424                         renew_lease(calldata->server, calldata->timestamp);
5425                         do_vfs_lock(calldata->fl.fl_file, &calldata->fl);
5426                         if (nfs4_update_lock_stateid(calldata->lsp,
5427                                         &calldata->res.stateid))
5428                                 break;
5429                 case -NFS4ERR_BAD_STATEID:
5430                 case -NFS4ERR_OLD_STATEID:
5431                 case -NFS4ERR_STALE_STATEID:
5432                 case -NFS4ERR_EXPIRED:
5433                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5434                                                 &calldata->lsp->ls_stateid))
5435                                 rpc_restart_call_prepare(task);
5436                         break;
5437                 default:
5438                         if (nfs4_async_handle_error(task, calldata->server,
5439                                                     NULL, NULL) == -EAGAIN)
5440                                 rpc_restart_call_prepare(task);
5441         }
5442         nfs_release_seqid(calldata->arg.seqid);
5443 }
5444
5445 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5446 {
5447         struct nfs4_unlockdata *calldata = data;
5448
5449         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5450                 goto out_wait;
5451         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5452         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5453                 /* Note: exit _without_ running nfs4_locku_done */
5454                 goto out_no_action;
5455         }
5456         calldata->timestamp = jiffies;
5457         if (nfs4_setup_sequence(calldata->server,
5458                                 &calldata->arg.seq_args,
5459                                 &calldata->res.seq_res,
5460                                 task) != 0)
5461                 nfs_release_seqid(calldata->arg.seqid);
5462         return;
5463 out_no_action:
5464         task->tk_action = NULL;
5465 out_wait:
5466         nfs4_sequence_done(task, &calldata->res.seq_res);
5467 }
5468
5469 static const struct rpc_call_ops nfs4_locku_ops = {
5470         .rpc_call_prepare = nfs4_locku_prepare,
5471         .rpc_call_done = nfs4_locku_done,
5472         .rpc_release = nfs4_locku_release_calldata,
5473 };
5474
5475 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5476                 struct nfs_open_context *ctx,
5477                 struct nfs4_lock_state *lsp,
5478                 struct nfs_seqid *seqid)
5479 {
5480         struct nfs4_unlockdata *data;
5481         struct rpc_message msg = {
5482                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5483                 .rpc_cred = ctx->cred,
5484         };
5485         struct rpc_task_setup task_setup_data = {
5486                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5487                 .rpc_message = &msg,
5488                 .callback_ops = &nfs4_locku_ops,
5489                 .workqueue = nfsiod_workqueue,
5490                 .flags = RPC_TASK_ASYNC,
5491         };
5492
5493         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5494                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5495
5496         /* Ensure this is an unlock - when canceling a lock, the
5497          * canceled lock is passed in, and it won't be an unlock.
5498          */
5499         fl->fl_type = F_UNLCK;
5500
5501         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5502         if (data == NULL) {
5503                 nfs_free_seqid(seqid);
5504                 return ERR_PTR(-ENOMEM);
5505         }
5506
5507         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5508         msg.rpc_argp = &data->arg;
5509         msg.rpc_resp = &data->res;
5510         task_setup_data.callback_data = data;
5511         return rpc_run_task(&task_setup_data);
5512 }
5513
5514 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5515 {
5516         struct inode *inode = state->inode;
5517         struct nfs4_state_owner *sp = state->owner;
5518         struct nfs_inode *nfsi = NFS_I(inode);
5519         struct nfs_seqid *seqid;
5520         struct nfs4_lock_state *lsp;
5521         struct rpc_task *task;
5522         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5523         int status = 0;
5524         unsigned char fl_flags = request->fl_flags;
5525
5526         status = nfs4_set_lock_state(state, request);
5527         /* Unlock _before_ we do the RPC call */
5528         request->fl_flags |= FL_EXISTS;
5529         /* Exclude nfs_delegation_claim_locks() */
5530         mutex_lock(&sp->so_delegreturn_mutex);
5531         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5532         down_read(&nfsi->rwsem);
5533         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5534                 up_read(&nfsi->rwsem);
5535                 mutex_unlock(&sp->so_delegreturn_mutex);
5536                 goto out;
5537         }
5538         up_read(&nfsi->rwsem);
5539         mutex_unlock(&sp->so_delegreturn_mutex);
5540         if (status != 0)
5541                 goto out;
5542         /* Is this a delegated lock? */
5543         lsp = request->fl_u.nfs4_fl.owner;
5544         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5545                 goto out;
5546         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5547         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5548         status = -ENOMEM;
5549         if (IS_ERR(seqid))
5550                 goto out;
5551         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5552         status = PTR_ERR(task);
5553         if (IS_ERR(task))
5554                 goto out;
5555         status = nfs4_wait_for_completion_rpc_task(task);
5556         rpc_put_task(task);
5557 out:
5558         request->fl_flags = fl_flags;
5559         trace_nfs4_unlock(request, state, F_SETLK, status);
5560         return status;
5561 }
5562
5563 struct nfs4_lockdata {
5564         struct nfs_lock_args arg;
5565         struct nfs_lock_res res;
5566         struct nfs4_lock_state *lsp;
5567         struct nfs_open_context *ctx;
5568         struct file_lock fl;
5569         unsigned long timestamp;
5570         int rpc_status;
5571         int cancelled;
5572         struct nfs_server *server;
5573 };
5574
5575 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5576                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5577                 gfp_t gfp_mask)
5578 {
5579         struct nfs4_lockdata *p;
5580         struct inode *inode = lsp->ls_state->inode;
5581         struct nfs_server *server = NFS_SERVER(inode);
5582         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5583
5584         p = kzalloc(sizeof(*p), gfp_mask);
5585         if (p == NULL)
5586                 return NULL;
5587
5588         p->arg.fh = NFS_FH(inode);
5589         p->arg.fl = &p->fl;
5590         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5591         if (IS_ERR(p->arg.open_seqid))
5592                 goto out_free;
5593         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5594         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5595         if (IS_ERR(p->arg.lock_seqid))
5596                 goto out_free_seqid;
5597         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5598         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5599         p->arg.lock_owner.s_dev = server->s_dev;
5600         p->res.lock_seqid = p->arg.lock_seqid;
5601         p->lsp = lsp;
5602         p->server = server;
5603         atomic_inc(&lsp->ls_count);
5604         p->ctx = get_nfs_open_context(ctx);
5605         memcpy(&p->fl, fl, sizeof(p->fl));
5606         return p;
5607 out_free_seqid:
5608         nfs_free_seqid(p->arg.open_seqid);
5609 out_free:
5610         kfree(p);
5611         return NULL;
5612 }
5613
5614 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5615 {
5616         struct nfs4_lockdata *data = calldata;
5617         struct nfs4_state *state = data->lsp->ls_state;
5618
5619         dprintk("%s: begin!\n", __func__);
5620         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5621                 goto out_wait;
5622         /* Do we need to do an open_to_lock_owner? */
5623         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5624                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5625                         goto out_release_lock_seqid;
5626                 }
5627                 nfs4_stateid_copy(&data->arg.open_stateid,
5628                                 &state->open_stateid);
5629                 data->arg.new_lock_owner = 1;
5630                 data->res.open_seqid = data->arg.open_seqid;
5631         } else {
5632                 data->arg.new_lock_owner = 0;
5633                 nfs4_stateid_copy(&data->arg.lock_stateid,
5634                                 &data->lsp->ls_stateid);
5635         }
5636         if (!nfs4_valid_open_stateid(state)) {
5637                 data->rpc_status = -EBADF;
5638                 task->tk_action = NULL;
5639                 goto out_release_open_seqid;
5640         }
5641         data->timestamp = jiffies;
5642         if (nfs4_setup_sequence(data->server,
5643                                 &data->arg.seq_args,
5644                                 &data->res.seq_res,
5645                                 task) == 0)
5646                 return;
5647 out_release_open_seqid:
5648         nfs_release_seqid(data->arg.open_seqid);
5649 out_release_lock_seqid:
5650         nfs_release_seqid(data->arg.lock_seqid);
5651 out_wait:
5652         nfs4_sequence_done(task, &data->res.seq_res);
5653         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5654 }
5655
5656 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5657 {
5658         struct nfs4_lockdata *data = calldata;
5659         struct nfs4_lock_state *lsp = data->lsp;
5660
5661         dprintk("%s: begin!\n", __func__);
5662
5663         if (!nfs4_sequence_done(task, &data->res.seq_res))
5664                 return;
5665
5666         data->rpc_status = task->tk_status;
5667         switch (task->tk_status) {
5668         case 0:
5669                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode),
5670                                 data->timestamp);
5671                 if (data->arg.new_lock) {
5672                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5673                         if (do_vfs_lock(data->fl.fl_file, &data->fl) < 0) {
5674                                 rpc_restart_call_prepare(task);
5675                                 break;
5676                         }
5677                 }
5678                 if (data->arg.new_lock_owner != 0) {
5679                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5680                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5681                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5682                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5683                         rpc_restart_call_prepare(task);
5684                 break;
5685         case -NFS4ERR_BAD_STATEID:
5686         case -NFS4ERR_OLD_STATEID:
5687         case -NFS4ERR_STALE_STATEID:
5688         case -NFS4ERR_EXPIRED:
5689                 if (data->arg.new_lock_owner != 0) {
5690                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5691                                                 &lsp->ls_state->open_stateid))
5692                                 rpc_restart_call_prepare(task);
5693                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5694                                                 &lsp->ls_stateid))
5695                                 rpc_restart_call_prepare(task);
5696         }
5697         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5698 }
5699
5700 static void nfs4_lock_release(void *calldata)
5701 {
5702         struct nfs4_lockdata *data = calldata;
5703
5704         dprintk("%s: begin!\n", __func__);
5705         nfs_free_seqid(data->arg.open_seqid);
5706         if (data->cancelled != 0) {
5707                 struct rpc_task *task;
5708                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5709                                 data->arg.lock_seqid);
5710                 if (!IS_ERR(task))
5711                         rpc_put_task_async(task);
5712                 dprintk("%s: cancelling lock!\n", __func__);
5713         } else
5714                 nfs_free_seqid(data->arg.lock_seqid);
5715         nfs4_put_lock_state(data->lsp);
5716         put_nfs_open_context(data->ctx);
5717         kfree(data);
5718         dprintk("%s: done!\n", __func__);
5719 }
5720
5721 static const struct rpc_call_ops nfs4_lock_ops = {
5722         .rpc_call_prepare = nfs4_lock_prepare,
5723         .rpc_call_done = nfs4_lock_done,
5724         .rpc_release = nfs4_lock_release,
5725 };
5726
5727 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5728 {
5729         switch (error) {
5730         case -NFS4ERR_ADMIN_REVOKED:
5731         case -NFS4ERR_BAD_STATEID:
5732                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5733                 if (new_lock_owner != 0 ||
5734                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5735                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5736                 break;
5737         case -NFS4ERR_STALE_STATEID:
5738                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5739         case -NFS4ERR_EXPIRED:
5740                 nfs4_schedule_lease_recovery(server->nfs_client);
5741         };
5742 }
5743
5744 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5745 {
5746         struct nfs4_lockdata *data;
5747         struct rpc_task *task;
5748         struct rpc_message msg = {
5749                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5750                 .rpc_cred = state->owner->so_cred,
5751         };
5752         struct rpc_task_setup task_setup_data = {
5753                 .rpc_client = NFS_CLIENT(state->inode),
5754                 .rpc_message = &msg,
5755                 .callback_ops = &nfs4_lock_ops,
5756                 .workqueue = nfsiod_workqueue,
5757                 .flags = RPC_TASK_ASYNC,
5758         };
5759         int ret;
5760
5761         dprintk("%s: begin!\n", __func__);
5762         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5763                         fl->fl_u.nfs4_fl.owner,
5764                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5765         if (data == NULL)
5766                 return -ENOMEM;
5767         if (IS_SETLKW(cmd))
5768                 data->arg.block = 1;
5769         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5770         msg.rpc_argp = &data->arg;
5771         msg.rpc_resp = &data->res;
5772         task_setup_data.callback_data = data;
5773         if (recovery_type > NFS_LOCK_NEW) {
5774                 if (recovery_type == NFS_LOCK_RECLAIM)
5775                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5776                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5777         } else
5778                 data->arg.new_lock = 1;
5779         task = rpc_run_task(&task_setup_data);
5780         if (IS_ERR(task))
5781                 return PTR_ERR(task);
5782         ret = nfs4_wait_for_completion_rpc_task(task);
5783         if (ret == 0) {
5784                 ret = data->rpc_status;
5785                 if (ret)
5786                         nfs4_handle_setlk_error(data->server, data->lsp,
5787                                         data->arg.new_lock_owner, ret);
5788         } else
5789                 data->cancelled = 1;
5790         rpc_put_task(task);
5791         dprintk("%s: done, ret = %d!\n", __func__, ret);
5792         return ret;
5793 }
5794
5795 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5796 {
5797         struct nfs_server *server = NFS_SERVER(state->inode);
5798         struct nfs4_exception exception = {
5799                 .inode = state->inode,
5800         };
5801         int err;
5802
5803         do {
5804                 /* Cache the lock if possible... */
5805                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5806                         return 0;
5807                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5808                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5809                 if (err != -NFS4ERR_DELAY)
5810                         break;
5811                 nfs4_handle_exception(server, err, &exception);
5812         } while (exception.retry);
5813         return err;
5814 }
5815
5816 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5817 {
5818         struct nfs_server *server = NFS_SERVER(state->inode);
5819         struct nfs4_exception exception = {
5820                 .inode = state->inode,
5821         };
5822         int err;
5823
5824         err = nfs4_set_lock_state(state, request);
5825         if (err != 0)
5826                 return err;
5827         if (!recover_lost_locks) {
5828                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5829                 return 0;
5830         }
5831         do {
5832                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5833                         return 0;
5834                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5835                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5836                 switch (err) {
5837                 default:
5838                         goto out;
5839                 case -NFS4ERR_GRACE:
5840                 case -NFS4ERR_DELAY:
5841                         nfs4_handle_exception(server, err, &exception);
5842                         err = 0;
5843                 }
5844         } while (exception.retry);
5845 out:
5846         return err;
5847 }
5848
5849 #if defined(CONFIG_NFS_V4_1)
5850 /**
5851  * nfs41_check_expired_locks - possibly free a lock stateid
5852  *
5853  * @state: NFSv4 state for an inode
5854  *
5855  * Returns NFS_OK if recovery for this stateid is now finished.
5856  * Otherwise a negative NFS4ERR value is returned.
5857  */
5858 static int nfs41_check_expired_locks(struct nfs4_state *state)
5859 {
5860         int status, ret = -NFS4ERR_BAD_STATEID;
5861         struct nfs4_lock_state *lsp;
5862         struct nfs_server *server = NFS_SERVER(state->inode);
5863
5864         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5865                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5866                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5867
5868                         status = nfs41_test_stateid(server,
5869                                         &lsp->ls_stateid,
5870                                         cred);
5871                         trace_nfs4_test_lock_stateid(state, lsp, status);
5872                         if (status != NFS_OK) {
5873                                 /* Free the stateid unless the server
5874                                  * informs us the stateid is unrecognized. */
5875                                 if (status != -NFS4ERR_BAD_STATEID)
5876                                         nfs41_free_stateid(server,
5877                                                         &lsp->ls_stateid,
5878                                                         cred);
5879                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5880                                 ret = status;
5881                         }
5882                 }
5883         };
5884
5885         return ret;
5886 }
5887
5888 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5889 {
5890         int status = NFS_OK;
5891
5892         if (test_bit(LK_STATE_IN_USE, &state->flags))
5893                 status = nfs41_check_expired_locks(state);
5894         if (status != NFS_OK)
5895                 status = nfs4_lock_expired(state, request);
5896         return status;
5897 }
5898 #endif
5899
5900 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5901 {
5902         struct nfs_inode *nfsi = NFS_I(state->inode);
5903         unsigned char fl_flags = request->fl_flags;
5904         int status = -ENOLCK;
5905
5906         if ((fl_flags & FL_POSIX) &&
5907                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5908                 goto out;
5909         /* Is this a delegated open? */
5910         status = nfs4_set_lock_state(state, request);
5911         if (status != 0)
5912                 goto out;
5913         request->fl_flags |= FL_ACCESS;
5914         status = do_vfs_lock(request->fl_file, request);
5915         if (status < 0)
5916                 goto out;
5917         down_read(&nfsi->rwsem);
5918         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5919                 /* Yes: cache locks! */
5920                 /* ...but avoid races with delegation recall... */
5921                 request->fl_flags = fl_flags & ~FL_SLEEP;
5922                 status = do_vfs_lock(request->fl_file, request);
5923                 up_read(&nfsi->rwsem);
5924                 goto out;
5925         }
5926         up_read(&nfsi->rwsem);
5927         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5928 out:
5929         request->fl_flags = fl_flags;
5930         return status;
5931 }
5932
5933 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5934 {
5935         struct nfs4_exception exception = {
5936                 .state = state,
5937                 .inode = state->inode,
5938         };
5939         int err;
5940
5941         do {
5942                 err = _nfs4_proc_setlk(state, cmd, request);
5943                 trace_nfs4_set_lock(request, state, cmd, err);
5944                 if (err == -NFS4ERR_DENIED)
5945                         err = -EAGAIN;
5946                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5947                                 err, &exception);
5948         } while (exception.retry);
5949         return err;
5950 }
5951
5952 static int
5953 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5954 {
5955         struct nfs_open_context *ctx;
5956         struct nfs4_state *state;
5957         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5958         int status;
5959
5960         /* verify open state */
5961         ctx = nfs_file_open_context(filp);
5962         state = ctx->state;
5963
5964         if (request->fl_start < 0 || request->fl_end < 0)
5965                 return -EINVAL;
5966
5967         if (IS_GETLK(cmd)) {
5968                 if (state != NULL)
5969                         return nfs4_proc_getlk(state, F_GETLK, request);
5970                 return 0;
5971         }
5972
5973         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5974                 return -EINVAL;
5975
5976         if (request->fl_type == F_UNLCK) {
5977                 if (state != NULL)
5978                         return nfs4_proc_unlck(state, cmd, request);
5979                 return 0;
5980         }
5981
5982         if (state == NULL)
5983                 return -ENOLCK;
5984         /*
5985          * Don't rely on the VFS having checked the file open mode,
5986          * since it won't do this for flock() locks.
5987          */
5988         switch (request->fl_type) {
5989         case F_RDLCK:
5990                 if (!(filp->f_mode & FMODE_READ))
5991                         return -EBADF;
5992                 break;
5993         case F_WRLCK:
5994                 if (!(filp->f_mode & FMODE_WRITE))
5995                         return -EBADF;
5996         }
5997
5998         do {
5999                 status = nfs4_proc_setlk(state, cmd, request);
6000                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6001                         break;
6002                 timeout = nfs4_set_lock_task_retry(timeout);
6003                 status = -ERESTARTSYS;
6004                 if (signalled())
6005                         break;
6006         } while(status < 0);
6007         return status;
6008 }
6009
6010 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6011 {
6012         struct nfs_server *server = NFS_SERVER(state->inode);
6013         int err;
6014
6015         err = nfs4_set_lock_state(state, fl);
6016         if (err != 0)
6017                 return err;
6018         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6019         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6020 }
6021
6022 struct nfs_release_lockowner_data {
6023         struct nfs4_lock_state *lsp;
6024         struct nfs_server *server;
6025         struct nfs_release_lockowner_args args;
6026         struct nfs_release_lockowner_res res;
6027         unsigned long timestamp;
6028 };
6029
6030 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6031 {
6032         struct nfs_release_lockowner_data *data = calldata;
6033         struct nfs_server *server = data->server;
6034         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6035                              &data->args.seq_args, &data->res.seq_res, task);
6036         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6037         data->timestamp = jiffies;
6038 }
6039
6040 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6041 {
6042         struct nfs_release_lockowner_data *data = calldata;
6043         struct nfs_server *server = data->server;
6044
6045         nfs40_sequence_done(task, &data->res.seq_res);
6046
6047         switch (task->tk_status) {
6048         case 0:
6049                 renew_lease(server, data->timestamp);
6050                 break;
6051         case -NFS4ERR_STALE_CLIENTID:
6052         case -NFS4ERR_EXPIRED:
6053                 nfs4_schedule_lease_recovery(server->nfs_client);
6054                 break;
6055         case -NFS4ERR_LEASE_MOVED:
6056         case -NFS4ERR_DELAY:
6057                 if (nfs4_async_handle_error(task, server,
6058                                             NULL, NULL) == -EAGAIN)
6059                         rpc_restart_call_prepare(task);
6060         }
6061 }
6062
6063 static void nfs4_release_lockowner_release(void *calldata)
6064 {
6065         struct nfs_release_lockowner_data *data = calldata;
6066         nfs4_free_lock_state(data->server, data->lsp);
6067         kfree(calldata);
6068 }
6069
6070 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6071         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6072         .rpc_call_done = nfs4_release_lockowner_done,
6073         .rpc_release = nfs4_release_lockowner_release,
6074 };
6075
6076 static void
6077 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6078 {
6079         struct nfs_release_lockowner_data *data;
6080         struct rpc_message msg = {
6081                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6082         };
6083
6084         if (server->nfs_client->cl_mvops->minor_version != 0)
6085                 return;
6086
6087         data = kmalloc(sizeof(*data), GFP_NOFS);
6088         if (!data)
6089                 return;
6090         data->lsp = lsp;
6091         data->server = server;
6092         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6093         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6094         data->args.lock_owner.s_dev = server->s_dev;
6095
6096         msg.rpc_argp = &data->args;
6097         msg.rpc_resp = &data->res;
6098         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6099         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6100 }
6101
6102 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6103
6104 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6105                                    const void *buf, size_t buflen,
6106                                    int flags, int type)
6107 {
6108         if (strcmp(key, "") != 0)
6109                 return -EINVAL;
6110
6111         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6112 }
6113
6114 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6115                                    void *buf, size_t buflen, int type)
6116 {
6117         if (strcmp(key, "") != 0)
6118                 return -EINVAL;
6119
6120         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6121 }
6122
6123 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6124                                        size_t list_len, const char *name,
6125                                        size_t name_len, int type)
6126 {
6127         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6128
6129         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6130                 return 0;
6131
6132         if (list && len <= list_len)
6133                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6134         return len;
6135 }
6136
6137 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6138 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6139 {
6140         return server->caps & NFS_CAP_SECURITY_LABEL;
6141 }
6142
6143 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6144                                    const void *buf, size_t buflen,
6145                                    int flags, int type)
6146 {
6147         if (security_ismaclabel(key))
6148                 return nfs4_set_security_label(dentry, buf, buflen);
6149
6150         return -EOPNOTSUPP;
6151 }
6152
6153 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6154                                    void *buf, size_t buflen, int type)
6155 {
6156         if (security_ismaclabel(key))
6157                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6158         return -EOPNOTSUPP;
6159 }
6160
6161 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6162                                        size_t list_len, const char *name,
6163                                        size_t name_len, int type)
6164 {
6165         size_t len = 0;
6166
6167         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6168                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6169                 if (list && len <= list_len)
6170                         security_inode_listsecurity(dentry->d_inode, list, len);
6171         }
6172         return len;
6173 }
6174
6175 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6176         .prefix = XATTR_SECURITY_PREFIX,
6177         .list   = nfs4_xattr_list_nfs4_label,
6178         .get    = nfs4_xattr_get_nfs4_label,
6179         .set    = nfs4_xattr_set_nfs4_label,
6180 };
6181 #endif
6182
6183
6184 /*
6185  * nfs_fhget will use either the mounted_on_fileid or the fileid
6186  */
6187 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6188 {
6189         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6190                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6191               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6192               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6193                 return;
6194
6195         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6196                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6197         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6198         fattr->nlink = 2;
6199 }
6200
6201 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6202                                    const struct qstr *name,
6203                                    struct nfs4_fs_locations *fs_locations,
6204                                    struct page *page)
6205 {
6206         struct nfs_server *server = NFS_SERVER(dir);
6207         u32 bitmask[3] = {
6208                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6209         };
6210         struct nfs4_fs_locations_arg args = {
6211                 .dir_fh = NFS_FH(dir),
6212                 .name = name,
6213                 .page = page,
6214                 .bitmask = bitmask,
6215         };
6216         struct nfs4_fs_locations_res res = {
6217                 .fs_locations = fs_locations,
6218         };
6219         struct rpc_message msg = {
6220                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6221                 .rpc_argp = &args,
6222                 .rpc_resp = &res,
6223         };
6224         int status;
6225
6226         dprintk("%s: start\n", __func__);
6227
6228         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6229          * is not supported */
6230         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6231                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6232         else
6233                 bitmask[0] |= FATTR4_WORD0_FILEID;
6234
6235         nfs_fattr_init(&fs_locations->fattr);
6236         fs_locations->server = server;
6237         fs_locations->nlocations = 0;
6238         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6239         dprintk("%s: returned status = %d\n", __func__, status);
6240         return status;
6241 }
6242
6243 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6244                            const struct qstr *name,
6245                            struct nfs4_fs_locations *fs_locations,
6246                            struct page *page)
6247 {
6248         struct nfs4_exception exception = { };
6249         int err;
6250         do {
6251                 err = _nfs4_proc_fs_locations(client, dir, name,
6252                                 fs_locations, page);
6253                 trace_nfs4_get_fs_locations(dir, name, err);
6254                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6255                                 &exception);
6256         } while (exception.retry);
6257         return err;
6258 }
6259
6260 /*
6261  * This operation also signals the server that this client is
6262  * performing migration recovery.  The server can stop returning
6263  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6264  * appended to this compound to identify the client ID which is
6265  * performing recovery.
6266  */
6267 static int _nfs40_proc_get_locations(struct inode *inode,
6268                                      struct nfs4_fs_locations *locations,
6269                                      struct page *page, struct rpc_cred *cred)
6270 {
6271         struct nfs_server *server = NFS_SERVER(inode);
6272         struct rpc_clnt *clnt = server->client;
6273         u32 bitmask[2] = {
6274                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6275         };
6276         struct nfs4_fs_locations_arg args = {
6277                 .clientid       = server->nfs_client->cl_clientid,
6278                 .fh             = NFS_FH(inode),
6279                 .page           = page,
6280                 .bitmask        = bitmask,
6281                 .migration      = 1,            /* skip LOOKUP */
6282                 .renew          = 1,            /* append RENEW */
6283         };
6284         struct nfs4_fs_locations_res res = {
6285                 .fs_locations   = locations,
6286                 .migration      = 1,
6287                 .renew          = 1,
6288         };
6289         struct rpc_message msg = {
6290                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6291                 .rpc_argp       = &args,
6292                 .rpc_resp       = &res,
6293                 .rpc_cred       = cred,
6294         };
6295         unsigned long now = jiffies;
6296         int status;
6297
6298         nfs_fattr_init(&locations->fattr);
6299         locations->server = server;
6300         locations->nlocations = 0;
6301
6302         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6303         nfs4_set_sequence_privileged(&args.seq_args);
6304         status = nfs4_call_sync_sequence(clnt, server, &msg,
6305                                         &args.seq_args, &res.seq_res);
6306         if (status)
6307                 return status;
6308
6309         renew_lease(server, now);
6310         return 0;
6311 }
6312
6313 #ifdef CONFIG_NFS_V4_1
6314
6315 /*
6316  * This operation also signals the server that this client is
6317  * performing migration recovery.  The server can stop asserting
6318  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6319  * performing this operation is identified in the SEQUENCE
6320  * operation in this compound.
6321  *
6322  * When the client supports GETATTR(fs_locations_info), it can
6323  * be plumbed in here.
6324  */
6325 static int _nfs41_proc_get_locations(struct inode *inode,
6326                                      struct nfs4_fs_locations *locations,
6327                                      struct page *page, struct rpc_cred *cred)
6328 {
6329         struct nfs_server *server = NFS_SERVER(inode);
6330         struct rpc_clnt *clnt = server->client;
6331         u32 bitmask[2] = {
6332                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6333         };
6334         struct nfs4_fs_locations_arg args = {
6335                 .fh             = NFS_FH(inode),
6336                 .page           = page,
6337                 .bitmask        = bitmask,
6338                 .migration      = 1,            /* skip LOOKUP */
6339         };
6340         struct nfs4_fs_locations_res res = {
6341                 .fs_locations   = locations,
6342                 .migration      = 1,
6343         };
6344         struct rpc_message msg = {
6345                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6346                 .rpc_argp       = &args,
6347                 .rpc_resp       = &res,
6348                 .rpc_cred       = cred,
6349         };
6350         int status;
6351
6352         nfs_fattr_init(&locations->fattr);
6353         locations->server = server;
6354         locations->nlocations = 0;
6355
6356         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6357         nfs4_set_sequence_privileged(&args.seq_args);
6358         status = nfs4_call_sync_sequence(clnt, server, &msg,
6359                                         &args.seq_args, &res.seq_res);
6360         if (status == NFS4_OK &&
6361             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6362                 status = -NFS4ERR_LEASE_MOVED;
6363         return status;
6364 }
6365
6366 #endif  /* CONFIG_NFS_V4_1 */
6367
6368 /**
6369  * nfs4_proc_get_locations - discover locations for a migrated FSID
6370  * @inode: inode on FSID that is migrating
6371  * @locations: result of query
6372  * @page: buffer
6373  * @cred: credential to use for this operation
6374  *
6375  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6376  * operation failed, or a negative errno if a local error occurred.
6377  *
6378  * On success, "locations" is filled in, but if the server has
6379  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6380  * asserted.
6381  *
6382  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6383  * from this client that require migration recovery.
6384  */
6385 int nfs4_proc_get_locations(struct inode *inode,
6386                             struct nfs4_fs_locations *locations,
6387                             struct page *page, struct rpc_cred *cred)
6388 {
6389         struct nfs_server *server = NFS_SERVER(inode);
6390         struct nfs_client *clp = server->nfs_client;
6391         const struct nfs4_mig_recovery_ops *ops =
6392                                         clp->cl_mvops->mig_recovery_ops;
6393         struct nfs4_exception exception = { };
6394         int status;
6395
6396         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6397                 (unsigned long long)server->fsid.major,
6398                 (unsigned long long)server->fsid.minor,
6399                 clp->cl_hostname);
6400         nfs_display_fhandle(NFS_FH(inode), __func__);
6401
6402         do {
6403                 status = ops->get_locations(inode, locations, page, cred);
6404                 if (status != -NFS4ERR_DELAY)
6405                         break;
6406                 nfs4_handle_exception(server, status, &exception);
6407         } while (exception.retry);
6408         return status;
6409 }
6410
6411 /*
6412  * This operation also signals the server that this client is
6413  * performing "lease moved" recovery.  The server can stop
6414  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6415  * is appended to this compound to identify the client ID which is
6416  * performing recovery.
6417  */
6418 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6419 {
6420         struct nfs_server *server = NFS_SERVER(inode);
6421         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6422         struct rpc_clnt *clnt = server->client;
6423         struct nfs4_fsid_present_arg args = {
6424                 .fh             = NFS_FH(inode),
6425                 .clientid       = clp->cl_clientid,
6426                 .renew          = 1,            /* append RENEW */
6427         };
6428         struct nfs4_fsid_present_res res = {
6429                 .renew          = 1,
6430         };
6431         struct rpc_message msg = {
6432                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6433                 .rpc_argp       = &args,
6434                 .rpc_resp       = &res,
6435                 .rpc_cred       = cred,
6436         };
6437         unsigned long now = jiffies;
6438         int status;
6439
6440         res.fh = nfs_alloc_fhandle();
6441         if (res.fh == NULL)
6442                 return -ENOMEM;
6443
6444         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6445         nfs4_set_sequence_privileged(&args.seq_args);
6446         status = nfs4_call_sync_sequence(clnt, server, &msg,
6447                                                 &args.seq_args, &res.seq_res);
6448         nfs_free_fhandle(res.fh);
6449         if (status)
6450                 return status;
6451
6452         do_renew_lease(clp, now);
6453         return 0;
6454 }
6455
6456 #ifdef CONFIG_NFS_V4_1
6457
6458 /*
6459  * This operation also signals the server that this client is
6460  * performing "lease moved" recovery.  The server can stop asserting
6461  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6462  * this operation is identified in the SEQUENCE operation in this
6463  * compound.
6464  */
6465 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6466 {
6467         struct nfs_server *server = NFS_SERVER(inode);
6468         struct rpc_clnt *clnt = server->client;
6469         struct nfs4_fsid_present_arg args = {
6470                 .fh             = NFS_FH(inode),
6471         };
6472         struct nfs4_fsid_present_res res = {
6473         };
6474         struct rpc_message msg = {
6475                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6476                 .rpc_argp       = &args,
6477                 .rpc_resp       = &res,
6478                 .rpc_cred       = cred,
6479         };
6480         int status;
6481
6482         res.fh = nfs_alloc_fhandle();
6483         if (res.fh == NULL)
6484                 return -ENOMEM;
6485
6486         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6487         nfs4_set_sequence_privileged(&args.seq_args);
6488         status = nfs4_call_sync_sequence(clnt, server, &msg,
6489                                                 &args.seq_args, &res.seq_res);
6490         nfs_free_fhandle(res.fh);
6491         if (status == NFS4_OK &&
6492             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6493                 status = -NFS4ERR_LEASE_MOVED;
6494         return status;
6495 }
6496
6497 #endif  /* CONFIG_NFS_V4_1 */
6498
6499 /**
6500  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6501  * @inode: inode on FSID to check
6502  * @cred: credential to use for this operation
6503  *
6504  * Server indicates whether the FSID is present, moved, or not
6505  * recognized.  This operation is necessary to clear a LEASE_MOVED
6506  * condition for this client ID.
6507  *
6508  * Returns NFS4_OK if the FSID is present on this server,
6509  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6510  *  NFS4ERR code if some error occurred on the server, or a
6511  *  negative errno if a local failure occurred.
6512  */
6513 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6514 {
6515         struct nfs_server *server = NFS_SERVER(inode);
6516         struct nfs_client *clp = server->nfs_client;
6517         const struct nfs4_mig_recovery_ops *ops =
6518                                         clp->cl_mvops->mig_recovery_ops;
6519         struct nfs4_exception exception = { };
6520         int status;
6521
6522         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6523                 (unsigned long long)server->fsid.major,
6524                 (unsigned long long)server->fsid.minor,
6525                 clp->cl_hostname);
6526         nfs_display_fhandle(NFS_FH(inode), __func__);
6527
6528         do {
6529                 status = ops->fsid_present(inode, cred);
6530                 if (status != -NFS4ERR_DELAY)
6531                         break;
6532                 nfs4_handle_exception(server, status, &exception);
6533         } while (exception.retry);
6534         return status;
6535 }
6536
6537 /**
6538  * If 'use_integrity' is true and the state managment nfs_client
6539  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6540  * and the machine credential as per RFC3530bis and RFC5661 Security
6541  * Considerations sections. Otherwise, just use the user cred with the
6542  * filesystem's rpc_client.
6543  */
6544 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6545 {
6546         int status;
6547         struct nfs4_secinfo_arg args = {
6548                 .dir_fh = NFS_FH(dir),
6549                 .name   = name,
6550         };
6551         struct nfs4_secinfo_res res = {
6552                 .flavors     = flavors,
6553         };
6554         struct rpc_message msg = {
6555                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6556                 .rpc_argp = &args,
6557                 .rpc_resp = &res,
6558         };
6559         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6560         struct rpc_cred *cred = NULL;
6561
6562         if (use_integrity) {
6563                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6564                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6565                 msg.rpc_cred = cred;
6566         }
6567
6568         dprintk("NFS call  secinfo %s\n", name->name);
6569
6570         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6571                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6572
6573         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6574                                 &res.seq_res, 0);
6575         dprintk("NFS reply  secinfo: %d\n", status);
6576
6577         if (cred)
6578                 put_rpccred(cred);
6579
6580         return status;
6581 }
6582
6583 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6584                       struct nfs4_secinfo_flavors *flavors)
6585 {
6586         struct nfs4_exception exception = { };
6587         int err;
6588         do {
6589                 err = -NFS4ERR_WRONGSEC;
6590
6591                 /* try to use integrity protection with machine cred */
6592                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6593                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6594
6595                 /*
6596                  * if unable to use integrity protection, or SECINFO with
6597                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6598                  * disallowed by spec, but exists in deployed servers) use
6599                  * the current filesystem's rpc_client and the user cred.
6600                  */
6601                 if (err == -NFS4ERR_WRONGSEC)
6602                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6603
6604                 trace_nfs4_secinfo(dir, name, err);
6605                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6606                                 &exception);
6607         } while (exception.retry);
6608         return err;
6609 }
6610
6611 #ifdef CONFIG_NFS_V4_1
6612 /*
6613  * Check the exchange flags returned by the server for invalid flags, having
6614  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6615  * DS flags set.
6616  */
6617 static int nfs4_check_cl_exchange_flags(u32 flags)
6618 {
6619         if (flags & ~EXCHGID4_FLAG_MASK_R)
6620                 goto out_inval;
6621         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6622             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6623                 goto out_inval;
6624         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6625                 goto out_inval;
6626         return NFS_OK;
6627 out_inval:
6628         return -NFS4ERR_INVAL;
6629 }
6630
6631 static bool
6632 nfs41_same_server_scope(struct nfs41_server_scope *a,
6633                         struct nfs41_server_scope *b)
6634 {
6635         if (a->server_scope_sz == b->server_scope_sz &&
6636             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6637                 return true;
6638
6639         return false;
6640 }
6641
6642 /*
6643  * nfs4_proc_bind_conn_to_session()
6644  *
6645  * The 4.1 client currently uses the same TCP connection for the
6646  * fore and backchannel.
6647  */
6648 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6649 {
6650         int status;
6651         struct nfs41_bind_conn_to_session_res res;
6652         struct rpc_message msg = {
6653                 .rpc_proc =
6654                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6655                 .rpc_argp = clp,
6656                 .rpc_resp = &res,
6657                 .rpc_cred = cred,
6658         };
6659
6660         dprintk("--> %s\n", __func__);
6661
6662         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6663         if (unlikely(res.session == NULL)) {
6664                 status = -ENOMEM;
6665                 goto out;
6666         }
6667
6668         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6669         trace_nfs4_bind_conn_to_session(clp, status);
6670         if (status == 0) {
6671                 if (memcmp(res.session->sess_id.data,
6672                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6673                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6674                         status = -EIO;
6675                         goto out_session;
6676                 }
6677                 if (res.dir != NFS4_CDFS4_BOTH) {
6678                         dprintk("NFS: %s: Unexpected direction from server\n",
6679                                 __func__);
6680                         status = -EIO;
6681                         goto out_session;
6682                 }
6683                 if (res.use_conn_in_rdma_mode) {
6684                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6685                                 __func__);
6686                         status = -EIO;
6687                         goto out_session;
6688                 }
6689         }
6690 out_session:
6691         kfree(res.session);
6692 out:
6693         dprintk("<-- %s status= %d\n", __func__, status);
6694         return status;
6695 }
6696
6697 /*
6698  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6699  * and operations we'd like to see to enable certain features in the allow map
6700  */
6701 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6702         .how = SP4_MACH_CRED,
6703         .enforce.u.words = {
6704                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6705                       1 << (OP_EXCHANGE_ID - 32) |
6706                       1 << (OP_CREATE_SESSION - 32) |
6707                       1 << (OP_DESTROY_SESSION - 32) |
6708                       1 << (OP_DESTROY_CLIENTID - 32)
6709         },
6710         .allow.u.words = {
6711                 [0] = 1 << (OP_CLOSE) |
6712                       1 << (OP_LOCKU) |
6713                       1 << (OP_COMMIT),
6714                 [1] = 1 << (OP_SECINFO - 32) |
6715                       1 << (OP_SECINFO_NO_NAME - 32) |
6716                       1 << (OP_TEST_STATEID - 32) |
6717                       1 << (OP_FREE_STATEID - 32) |
6718                       1 << (OP_WRITE - 32)
6719         }
6720 };
6721
6722 /*
6723  * Select the state protection mode for client `clp' given the server results
6724  * from exchange_id in `sp'.
6725  *
6726  * Returns 0 on success, negative errno otherwise.
6727  */
6728 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6729                                  struct nfs41_state_protection *sp)
6730 {
6731         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6732                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6733                       1 << (OP_EXCHANGE_ID - 32) |
6734                       1 << (OP_CREATE_SESSION - 32) |
6735                       1 << (OP_DESTROY_SESSION - 32) |
6736                       1 << (OP_DESTROY_CLIENTID - 32)
6737         };
6738         unsigned int i;
6739
6740         if (sp->how == SP4_MACH_CRED) {
6741                 /* Print state protect result */
6742                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6743                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6744                         if (test_bit(i, sp->enforce.u.longs))
6745                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6746                         if (test_bit(i, sp->allow.u.longs))
6747                                 dfprintk(MOUNT, "  allow op %d\n", i);
6748                 }
6749
6750                 /* make sure nothing is on enforce list that isn't supported */
6751                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6752                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6753                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6754                                 return -EINVAL;
6755                         }
6756                 }
6757
6758                 /*
6759                  * Minimal mode - state operations are allowed to use machine
6760                  * credential.  Note this already happens by default, so the
6761                  * client doesn't have to do anything more than the negotiation.
6762                  *
6763                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6764                  *       we're already using the machine cred for exchange_id
6765                  *       and will never use a different cred.
6766                  */
6767                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6768                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6769                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6770                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6771                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6772                         dfprintk(MOUNT, "  minimal mode enabled\n");
6773                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6774                 } else {
6775                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6776                         return -EINVAL;
6777                 }
6778
6779                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6780                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6781                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6782                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6783                 }
6784
6785                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6786                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6787                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6788                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6789                 }
6790
6791                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6792                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6793                         dfprintk(MOUNT, "  stateid mode enabled\n");
6794                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6795                 }
6796
6797                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6798                         dfprintk(MOUNT, "  write mode enabled\n");
6799                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6800                 }
6801
6802                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6803                         dfprintk(MOUNT, "  commit mode enabled\n");
6804                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6805                 }
6806         }
6807
6808         return 0;
6809 }
6810
6811 /*
6812  * _nfs4_proc_exchange_id()
6813  *
6814  * Wrapper for EXCHANGE_ID operation.
6815  */
6816 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6817         u32 sp4_how)
6818 {
6819         nfs4_verifier verifier;
6820         struct nfs41_exchange_id_args args = {
6821                 .verifier = &verifier,
6822                 .client = clp,
6823 #ifdef CONFIG_NFS_V4_1_MIGRATION
6824                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6825                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6826                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6827 #else
6828                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6829                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6830 #endif
6831         };
6832         struct nfs41_exchange_id_res res = {
6833                 0
6834         };
6835         int status;
6836         struct rpc_message msg = {
6837                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6838                 .rpc_argp = &args,
6839                 .rpc_resp = &res,
6840                 .rpc_cred = cred,
6841         };
6842
6843         nfs4_init_boot_verifier(clp, &verifier);
6844         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6845                                                         sizeof(args.id));
6846         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6847                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6848                 args.id_len, args.id);
6849
6850         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6851                                         GFP_NOFS);
6852         if (unlikely(res.server_owner == NULL)) {
6853                 status = -ENOMEM;
6854                 goto out;
6855         }
6856
6857         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6858                                         GFP_NOFS);
6859         if (unlikely(res.server_scope == NULL)) {
6860                 status = -ENOMEM;
6861                 goto out_server_owner;
6862         }
6863
6864         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6865         if (unlikely(res.impl_id == NULL)) {
6866                 status = -ENOMEM;
6867                 goto out_server_scope;
6868         }
6869
6870         switch (sp4_how) {
6871         case SP4_NONE:
6872                 args.state_protect.how = SP4_NONE;
6873                 break;
6874
6875         case SP4_MACH_CRED:
6876                 args.state_protect = nfs4_sp4_mach_cred_request;
6877                 break;
6878
6879         default:
6880                 /* unsupported! */
6881                 WARN_ON_ONCE(1);
6882                 status = -EINVAL;
6883                 goto out_server_scope;
6884         }
6885
6886         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6887         trace_nfs4_exchange_id(clp, status);
6888         if (status == 0)
6889                 status = nfs4_check_cl_exchange_flags(res.flags);
6890
6891         if (status == 0)
6892                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6893
6894         if (status == 0) {
6895                 clp->cl_clientid = res.clientid;
6896                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6897                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6898                         clp->cl_seqid = res.seqid;
6899
6900                 kfree(clp->cl_serverowner);
6901                 clp->cl_serverowner = res.server_owner;
6902                 res.server_owner = NULL;
6903
6904                 /* use the most recent implementation id */
6905                 kfree(clp->cl_implid);
6906                 clp->cl_implid = res.impl_id;
6907
6908                 if (clp->cl_serverscope != NULL &&
6909                     !nfs41_same_server_scope(clp->cl_serverscope,
6910                                              res.server_scope)) {
6911                         dprintk("%s: server_scope mismatch detected\n",
6912                                 __func__);
6913                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6914                         kfree(clp->cl_serverscope);
6915                         clp->cl_serverscope = NULL;
6916                 }
6917
6918                 if (clp->cl_serverscope == NULL) {
6919                         clp->cl_serverscope = res.server_scope;
6920                         goto out;
6921                 }
6922         } else
6923                 kfree(res.impl_id);
6924
6925 out_server_owner:
6926         kfree(res.server_owner);
6927 out_server_scope:
6928         kfree(res.server_scope);
6929 out:
6930         if (clp->cl_implid != NULL)
6931                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6932                         "domain: %s, name: %s, date: %llu,%u\n",
6933                         clp->cl_implid->domain, clp->cl_implid->name,
6934                         clp->cl_implid->date.seconds,
6935                         clp->cl_implid->date.nseconds);
6936         dprintk("NFS reply exchange_id: %d\n", status);
6937         return status;
6938 }
6939
6940 /*
6941  * nfs4_proc_exchange_id()
6942  *
6943  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6944  *
6945  * Since the clientid has expired, all compounds using sessions
6946  * associated with the stale clientid will be returning
6947  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6948  * be in some phase of session reset.
6949  *
6950  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6951  */
6952 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6953 {
6954         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6955         int status;
6956
6957         /* try SP4_MACH_CRED if krb5i/p */
6958         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6959             authflavor == RPC_AUTH_GSS_KRB5P) {
6960                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6961                 if (!status)
6962                         return 0;
6963         }
6964
6965         /* try SP4_NONE */
6966         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6967 }
6968
6969 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6970                 struct rpc_cred *cred)
6971 {
6972         struct rpc_message msg = {
6973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6974                 .rpc_argp = clp,
6975                 .rpc_cred = cred,
6976         };
6977         int status;
6978
6979         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6980         trace_nfs4_destroy_clientid(clp, status);
6981         if (status)
6982                 dprintk("NFS: Got error %d from the server %s on "
6983                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6984         return status;
6985 }
6986
6987 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6988                 struct rpc_cred *cred)
6989 {
6990         unsigned int loop;
6991         int ret;
6992
6993         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6994                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6995                 switch (ret) {
6996                 case -NFS4ERR_DELAY:
6997                 case -NFS4ERR_CLIENTID_BUSY:
6998                         ssleep(1);
6999                         break;
7000                 default:
7001                         return ret;
7002                 }
7003         }
7004         return 0;
7005 }
7006
7007 int nfs4_destroy_clientid(struct nfs_client *clp)
7008 {
7009         struct rpc_cred *cred;
7010         int ret = 0;
7011
7012         if (clp->cl_mvops->minor_version < 1)
7013                 goto out;
7014         if (clp->cl_exchange_flags == 0)
7015                 goto out;
7016         if (clp->cl_preserve_clid)
7017                 goto out;
7018         cred = nfs4_get_clid_cred(clp);
7019         ret = nfs4_proc_destroy_clientid(clp, cred);
7020         if (cred)
7021                 put_rpccred(cred);
7022         switch (ret) {
7023         case 0:
7024         case -NFS4ERR_STALE_CLIENTID:
7025                 clp->cl_exchange_flags = 0;
7026         }
7027 out:
7028         return ret;
7029 }
7030
7031 struct nfs4_get_lease_time_data {
7032         struct nfs4_get_lease_time_args *args;
7033         struct nfs4_get_lease_time_res *res;
7034         struct nfs_client *clp;
7035 };
7036
7037 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7038                                         void *calldata)
7039 {
7040         struct nfs4_get_lease_time_data *data =
7041                         (struct nfs4_get_lease_time_data *)calldata;
7042
7043         dprintk("--> %s\n", __func__);
7044         /* just setup sequence, do not trigger session recovery
7045            since we're invoked within one */
7046         nfs41_setup_sequence(data->clp->cl_session,
7047                         &data->args->la_seq_args,
7048                         &data->res->lr_seq_res,
7049                         task);
7050         dprintk("<-- %s\n", __func__);
7051 }
7052
7053 /*
7054  * Called from nfs4_state_manager thread for session setup, so don't recover
7055  * from sequence operation or clientid errors.
7056  */
7057 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7058 {
7059         struct nfs4_get_lease_time_data *data =
7060                         (struct nfs4_get_lease_time_data *)calldata;
7061
7062         dprintk("--> %s\n", __func__);
7063         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7064                 return;
7065         switch (task->tk_status) {
7066         case -NFS4ERR_DELAY:
7067         case -NFS4ERR_GRACE:
7068                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7069                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7070                 task->tk_status = 0;
7071                 /* fall through */
7072         case -NFS4ERR_RETRY_UNCACHED_REP:
7073                 rpc_restart_call_prepare(task);
7074                 return;
7075         }
7076         dprintk("<-- %s\n", __func__);
7077 }
7078
7079 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7080         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7081         .rpc_call_done = nfs4_get_lease_time_done,
7082 };
7083
7084 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7085 {
7086         struct rpc_task *task;
7087         struct nfs4_get_lease_time_args args;
7088         struct nfs4_get_lease_time_res res = {
7089                 .lr_fsinfo = fsinfo,
7090         };
7091         struct nfs4_get_lease_time_data data = {
7092                 .args = &args,
7093                 .res = &res,
7094                 .clp = clp,
7095         };
7096         struct rpc_message msg = {
7097                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7098                 .rpc_argp = &args,
7099                 .rpc_resp = &res,
7100         };
7101         struct rpc_task_setup task_setup = {
7102                 .rpc_client = clp->cl_rpcclient,
7103                 .rpc_message = &msg,
7104                 .callback_ops = &nfs4_get_lease_time_ops,
7105                 .callback_data = &data,
7106                 .flags = RPC_TASK_TIMEOUT,
7107         };
7108         int status;
7109
7110         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7111         nfs4_set_sequence_privileged(&args.la_seq_args);
7112         dprintk("--> %s\n", __func__);
7113         task = rpc_run_task(&task_setup);
7114
7115         if (IS_ERR(task))
7116                 status = PTR_ERR(task);
7117         else {
7118                 status = task->tk_status;
7119                 rpc_put_task(task);
7120         }
7121         dprintk("<-- %s return %d\n", __func__, status);
7122
7123         return status;
7124 }
7125
7126 /*
7127  * Initialize the values to be used by the client in CREATE_SESSION
7128  * If nfs4_init_session set the fore channel request and response sizes,
7129  * use them.
7130  *
7131  * Set the back channel max_resp_sz_cached to zero to force the client to
7132  * always set csa_cachethis to FALSE because the current implementation
7133  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7134  */
7135 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7136 {
7137         unsigned int max_rqst_sz, max_resp_sz;
7138
7139         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7140         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7141
7142         /* Fore channel attributes */
7143         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7144         args->fc_attrs.max_resp_sz = max_resp_sz;
7145         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7146         args->fc_attrs.max_reqs = max_session_slots;
7147
7148         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7149                 "max_ops=%u max_reqs=%u\n",
7150                 __func__,
7151                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7152                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7153
7154         /* Back channel attributes */
7155         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7156         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7157         args->bc_attrs.max_resp_sz_cached = 0;
7158         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7159         args->bc_attrs.max_reqs = 1;
7160
7161         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7162                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7163                 __func__,
7164                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7165                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7166                 args->bc_attrs.max_reqs);
7167 }
7168
7169 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7170 {
7171         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7172         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
7173
7174         if (rcvd->max_resp_sz > sent->max_resp_sz)
7175                 return -EINVAL;
7176         /*
7177          * Our requested max_ops is the minimum we need; we're not
7178          * prepared to break up compounds into smaller pieces than that.
7179          * So, no point even trying to continue if the server won't
7180          * cooperate:
7181          */
7182         if (rcvd->max_ops < sent->max_ops)
7183                 return -EINVAL;
7184         if (rcvd->max_reqs == 0)
7185                 return -EINVAL;
7186         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7187                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7188         return 0;
7189 }
7190
7191 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
7192 {
7193         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7194         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
7195
7196         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7197                 return -EINVAL;
7198         if (rcvd->max_resp_sz < sent->max_resp_sz)
7199                 return -EINVAL;
7200         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7201                 return -EINVAL;
7202         /* These would render the backchannel useless: */
7203         if (rcvd->max_ops != sent->max_ops)
7204                 return -EINVAL;
7205         if (rcvd->max_reqs != sent->max_reqs)
7206                 return -EINVAL;
7207         return 0;
7208 }
7209
7210 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7211                                      struct nfs4_session *session)
7212 {
7213         int ret;
7214
7215         ret = nfs4_verify_fore_channel_attrs(args, session);
7216         if (ret)
7217                 return ret;
7218         return nfs4_verify_back_channel_attrs(args, session);
7219 }
7220
7221 static int _nfs4_proc_create_session(struct nfs_client *clp,
7222                 struct rpc_cred *cred)
7223 {
7224         struct nfs4_session *session = clp->cl_session;
7225         struct nfs41_create_session_args args = {
7226                 .client = clp,
7227                 .cb_program = NFS4_CALLBACK,
7228         };
7229         struct nfs41_create_session_res res = {
7230                 .client = clp,
7231         };
7232         struct rpc_message msg = {
7233                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7234                 .rpc_argp = &args,
7235                 .rpc_resp = &res,
7236                 .rpc_cred = cred,
7237         };
7238         int status;
7239
7240         nfs4_init_channel_attrs(&args);
7241         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7242
7243         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7244         trace_nfs4_create_session(clp, status);
7245
7246         if (!status) {
7247                 /* Verify the session's negotiated channel_attrs values */
7248                 status = nfs4_verify_channel_attrs(&args, session);
7249                 /* Increment the clientid slot sequence id */
7250                 clp->cl_seqid++;
7251         }
7252
7253         return status;
7254 }
7255
7256 /*
7257  * Issues a CREATE_SESSION operation to the server.
7258  * It is the responsibility of the caller to verify the session is
7259  * expired before calling this routine.
7260  */
7261 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7262 {
7263         int status;
7264         unsigned *ptr;
7265         struct nfs4_session *session = clp->cl_session;
7266
7267         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7268
7269         status = _nfs4_proc_create_session(clp, cred);
7270         if (status)
7271                 goto out;
7272
7273         /* Init or reset the session slot tables */
7274         status = nfs4_setup_session_slot_tables(session);
7275         dprintk("slot table setup returned %d\n", status);
7276         if (status)
7277                 goto out;
7278
7279         ptr = (unsigned *)&session->sess_id.data[0];
7280         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7281                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7282 out:
7283         dprintk("<-- %s\n", __func__);
7284         return status;
7285 }
7286
7287 /*
7288  * Issue the over-the-wire RPC DESTROY_SESSION.
7289  * The caller must serialize access to this routine.
7290  */
7291 int nfs4_proc_destroy_session(struct nfs4_session *session,
7292                 struct rpc_cred *cred)
7293 {
7294         struct rpc_message msg = {
7295                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7296                 .rpc_argp = session,
7297                 .rpc_cred = cred,
7298         };
7299         int status = 0;
7300
7301         dprintk("--> nfs4_proc_destroy_session\n");
7302
7303         /* session is still being setup */
7304         if (session->clp->cl_cons_state != NFS_CS_READY)
7305                 return status;
7306
7307         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7308         trace_nfs4_destroy_session(session->clp, status);
7309
7310         if (status)
7311                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7312                         "Session has been destroyed regardless...\n", status);
7313
7314         dprintk("<-- nfs4_proc_destroy_session\n");
7315         return status;
7316 }
7317
7318 /*
7319  * Renew the cl_session lease.
7320  */
7321 struct nfs4_sequence_data {
7322         struct nfs_client *clp;
7323         struct nfs4_sequence_args args;
7324         struct nfs4_sequence_res res;
7325 };
7326
7327 static void nfs41_sequence_release(void *data)
7328 {
7329         struct nfs4_sequence_data *calldata = data;
7330         struct nfs_client *clp = calldata->clp;
7331
7332         if (atomic_read(&clp->cl_count) > 1)
7333                 nfs4_schedule_state_renewal(clp);
7334         nfs_put_client(clp);
7335         kfree(calldata);
7336 }
7337
7338 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7339 {
7340         switch(task->tk_status) {
7341         case -NFS4ERR_DELAY:
7342                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7343                 return -EAGAIN;
7344         default:
7345                 nfs4_schedule_lease_recovery(clp);
7346         }
7347         return 0;
7348 }
7349
7350 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7351 {
7352         struct nfs4_sequence_data *calldata = data;
7353         struct nfs_client *clp = calldata->clp;
7354
7355         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7356                 return;
7357
7358         trace_nfs4_sequence(clp, task->tk_status);
7359         if (task->tk_status < 0) {
7360                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7361                 if (atomic_read(&clp->cl_count) == 1)
7362                         goto out;
7363
7364                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7365                         rpc_restart_call_prepare(task);
7366                         return;
7367                 }
7368         }
7369         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7370 out:
7371         dprintk("<-- %s\n", __func__);
7372 }
7373
7374 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7375 {
7376         struct nfs4_sequence_data *calldata = data;
7377         struct nfs_client *clp = calldata->clp;
7378         struct nfs4_sequence_args *args;
7379         struct nfs4_sequence_res *res;
7380
7381         args = task->tk_msg.rpc_argp;
7382         res = task->tk_msg.rpc_resp;
7383
7384         nfs41_setup_sequence(clp->cl_session, args, res, task);
7385 }
7386
7387 static const struct rpc_call_ops nfs41_sequence_ops = {
7388         .rpc_call_done = nfs41_sequence_call_done,
7389         .rpc_call_prepare = nfs41_sequence_prepare,
7390         .rpc_release = nfs41_sequence_release,
7391 };
7392
7393 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7394                 struct rpc_cred *cred,
7395                 bool is_privileged)
7396 {
7397         struct nfs4_sequence_data *calldata;
7398         struct rpc_message msg = {
7399                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7400                 .rpc_cred = cred,
7401         };
7402         struct rpc_task_setup task_setup_data = {
7403                 .rpc_client = clp->cl_rpcclient,
7404                 .rpc_message = &msg,
7405                 .callback_ops = &nfs41_sequence_ops,
7406                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7407         };
7408
7409         if (!atomic_inc_not_zero(&clp->cl_count))
7410                 return ERR_PTR(-EIO);
7411         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7412         if (calldata == NULL) {
7413                 nfs_put_client(clp);
7414                 return ERR_PTR(-ENOMEM);
7415         }
7416         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7417         if (is_privileged)
7418                 nfs4_set_sequence_privileged(&calldata->args);
7419         msg.rpc_argp = &calldata->args;
7420         msg.rpc_resp = &calldata->res;
7421         calldata->clp = clp;
7422         task_setup_data.callback_data = calldata;
7423
7424         return rpc_run_task(&task_setup_data);
7425 }
7426
7427 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7428 {
7429         struct rpc_task *task;
7430         int ret = 0;
7431
7432         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7433                 return -EAGAIN;
7434         task = _nfs41_proc_sequence(clp, cred, false);
7435         if (IS_ERR(task))
7436                 ret = PTR_ERR(task);
7437         else
7438                 rpc_put_task_async(task);
7439         dprintk("<-- %s status=%d\n", __func__, ret);
7440         return ret;
7441 }
7442
7443 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7444 {
7445         struct rpc_task *task;
7446         int ret;
7447
7448         task = _nfs41_proc_sequence(clp, cred, true);
7449         if (IS_ERR(task)) {
7450                 ret = PTR_ERR(task);
7451                 goto out;
7452         }
7453         ret = rpc_wait_for_completion_task(task);
7454         if (!ret) {
7455                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7456
7457                 if (task->tk_status == 0)
7458                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7459                 ret = task->tk_status;
7460         }
7461         rpc_put_task(task);
7462 out:
7463         dprintk("<-- %s status=%d\n", __func__, ret);
7464         return ret;
7465 }
7466
7467 struct nfs4_reclaim_complete_data {
7468         struct nfs_client *clp;
7469         struct nfs41_reclaim_complete_args arg;
7470         struct nfs41_reclaim_complete_res res;
7471 };
7472
7473 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7474 {
7475         struct nfs4_reclaim_complete_data *calldata = data;
7476
7477         nfs41_setup_sequence(calldata->clp->cl_session,
7478                         &calldata->arg.seq_args,
7479                         &calldata->res.seq_res,
7480                         task);
7481 }
7482
7483 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7484 {
7485         switch(task->tk_status) {
7486         case 0:
7487         case -NFS4ERR_COMPLETE_ALREADY:
7488         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7489                 break;
7490         case -NFS4ERR_DELAY:
7491                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7492                 /* fall through */
7493         case -NFS4ERR_RETRY_UNCACHED_REP:
7494                 return -EAGAIN;
7495         default:
7496                 nfs4_schedule_lease_recovery(clp);
7497         }
7498         return 0;
7499 }
7500
7501 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7502 {
7503         struct nfs4_reclaim_complete_data *calldata = data;
7504         struct nfs_client *clp = calldata->clp;
7505         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7506
7507         dprintk("--> %s\n", __func__);
7508         if (!nfs41_sequence_done(task, res))
7509                 return;
7510
7511         trace_nfs4_reclaim_complete(clp, task->tk_status);
7512         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7513                 rpc_restart_call_prepare(task);
7514                 return;
7515         }
7516         dprintk("<-- %s\n", __func__);
7517 }
7518
7519 static void nfs4_free_reclaim_complete_data(void *data)
7520 {
7521         struct nfs4_reclaim_complete_data *calldata = data;
7522
7523         kfree(calldata);
7524 }
7525
7526 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7527         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7528         .rpc_call_done = nfs4_reclaim_complete_done,
7529         .rpc_release = nfs4_free_reclaim_complete_data,
7530 };
7531
7532 /*
7533  * Issue a global reclaim complete.
7534  */
7535 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7536                 struct rpc_cred *cred)
7537 {
7538         struct nfs4_reclaim_complete_data *calldata;
7539         struct rpc_task *task;
7540         struct rpc_message msg = {
7541                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7542                 .rpc_cred = cred,
7543         };
7544         struct rpc_task_setup task_setup_data = {
7545                 .rpc_client = clp->cl_rpcclient,
7546                 .rpc_message = &msg,
7547                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7548                 .flags = RPC_TASK_ASYNC,
7549         };
7550         int status = -ENOMEM;
7551
7552         dprintk("--> %s\n", __func__);
7553         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7554         if (calldata == NULL)
7555                 goto out;
7556         calldata->clp = clp;
7557         calldata->arg.one_fs = 0;
7558
7559         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7560         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7561         msg.rpc_argp = &calldata->arg;
7562         msg.rpc_resp = &calldata->res;
7563         task_setup_data.callback_data = calldata;
7564         task = rpc_run_task(&task_setup_data);
7565         if (IS_ERR(task)) {
7566                 status = PTR_ERR(task);
7567                 goto out;
7568         }
7569         status = nfs4_wait_for_completion_rpc_task(task);
7570         if (status == 0)
7571                 status = task->tk_status;
7572         rpc_put_task(task);
7573         return 0;
7574 out:
7575         dprintk("<-- %s status=%d\n", __func__, status);
7576         return status;
7577 }
7578
7579 static void
7580 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7581 {
7582         struct nfs4_layoutget *lgp = calldata;
7583         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7584         struct nfs4_session *session = nfs4_get_session(server);
7585
7586         dprintk("--> %s\n", __func__);
7587         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7588          * right now covering the LAYOUTGET we are about to send.
7589          * However, that is not so catastrophic, and there seems
7590          * to be no way to prevent it completely.
7591          */
7592         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7593                                 &lgp->res.seq_res, task))
7594                 return;
7595         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7596                                           NFS_I(lgp->args.inode)->layout,
7597                                           &lgp->args.range,
7598                                           lgp->args.ctx->state)) {
7599                 rpc_exit(task, NFS4_OK);
7600         }
7601 }
7602
7603 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7604 {
7605         struct nfs4_layoutget *lgp = calldata;
7606         struct inode *inode = lgp->args.inode;
7607         struct nfs_server *server = NFS_SERVER(inode);
7608         struct pnfs_layout_hdr *lo;
7609         struct nfs4_state *state = NULL;
7610         unsigned long timeo, now, giveup;
7611
7612         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7613
7614         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7615                 goto out;
7616
7617         switch (task->tk_status) {
7618         case 0:
7619                 goto out;
7620         /*
7621          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7622          * (or clients) writing to the same RAID stripe
7623          */
7624         case -NFS4ERR_LAYOUTTRYLATER:
7625         /*
7626          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7627          * existing layout before getting a new one).
7628          */
7629         case -NFS4ERR_RECALLCONFLICT:
7630                 timeo = rpc_get_timeout(task->tk_client);
7631                 giveup = lgp->args.timestamp + timeo;
7632                 now = jiffies;
7633                 if (time_after(giveup, now)) {
7634                         unsigned long delay;
7635
7636                         /* Delay for:
7637                          * - Not less then NFS4_POLL_RETRY_MIN.
7638                          * - One last time a jiffie before we give up
7639                          * - exponential backoff (time_now minus start_attempt)
7640                          */
7641                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7642                                     min((giveup - now - 1),
7643                                         now - lgp->args.timestamp));
7644
7645                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7646                                 __func__, delay);
7647                         rpc_delay(task, delay);
7648                         task->tk_status = 0;
7649                         rpc_restart_call_prepare(task);
7650                         goto out; /* Do not call nfs4_async_handle_error() */
7651                 }
7652                 break;
7653         case -NFS4ERR_EXPIRED:
7654         case -NFS4ERR_BAD_STATEID:
7655                 spin_lock(&inode->i_lock);
7656                 lo = NFS_I(inode)->layout;
7657                 if (!lo || list_empty(&lo->plh_segs)) {
7658                         spin_unlock(&inode->i_lock);
7659                         /* If the open stateid was bad, then recover it. */
7660                         state = lgp->args.ctx->state;
7661                 } else {
7662                         LIST_HEAD(head);
7663
7664                         /*
7665                          * Mark the bad layout state as invalid, then retry
7666                          * with the current stateid.
7667                          */
7668                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7669                         spin_unlock(&inode->i_lock);
7670                         pnfs_free_lseg_list(&head);
7671
7672                         task->tk_status = 0;
7673                         rpc_restart_call_prepare(task);
7674                 }
7675         }
7676         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7677                 rpc_restart_call_prepare(task);
7678 out:
7679         dprintk("<-- %s\n", __func__);
7680 }
7681
7682 static size_t max_response_pages(struct nfs_server *server)
7683 {
7684         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7685         return nfs_page_array_len(0, max_resp_sz);
7686 }
7687
7688 static void nfs4_free_pages(struct page **pages, size_t size)
7689 {
7690         int i;
7691
7692         if (!pages)
7693                 return;
7694
7695         for (i = 0; i < size; i++) {
7696                 if (!pages[i])
7697                         break;
7698                 __free_page(pages[i]);
7699         }
7700         kfree(pages);
7701 }
7702
7703 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7704 {
7705         struct page **pages;
7706         int i;
7707
7708         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7709         if (!pages) {
7710                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7711                 return NULL;
7712         }
7713
7714         for (i = 0; i < size; i++) {
7715                 pages[i] = alloc_page(gfp_flags);
7716                 if (!pages[i]) {
7717                         dprintk("%s: failed to allocate page\n", __func__);
7718                         nfs4_free_pages(pages, size);
7719                         return NULL;
7720                 }
7721         }
7722
7723         return pages;
7724 }
7725
7726 static void nfs4_layoutget_release(void *calldata)
7727 {
7728         struct nfs4_layoutget *lgp = calldata;
7729         struct inode *inode = lgp->args.inode;
7730         struct nfs_server *server = NFS_SERVER(inode);
7731         size_t max_pages = max_response_pages(server);
7732
7733         dprintk("--> %s\n", __func__);
7734         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7735         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7736         put_nfs_open_context(lgp->args.ctx);
7737         kfree(calldata);
7738         dprintk("<-- %s\n", __func__);
7739 }
7740
7741 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7742         .rpc_call_prepare = nfs4_layoutget_prepare,
7743         .rpc_call_done = nfs4_layoutget_done,
7744         .rpc_release = nfs4_layoutget_release,
7745 };
7746
7747 struct pnfs_layout_segment *
7748 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7749 {
7750         struct inode *inode = lgp->args.inode;
7751         struct nfs_server *server = NFS_SERVER(inode);
7752         size_t max_pages = max_response_pages(server);
7753         struct rpc_task *task;
7754         struct rpc_message msg = {
7755                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7756                 .rpc_argp = &lgp->args,
7757                 .rpc_resp = &lgp->res,
7758                 .rpc_cred = lgp->cred,
7759         };
7760         struct rpc_task_setup task_setup_data = {
7761                 .rpc_client = server->client,
7762                 .rpc_message = &msg,
7763                 .callback_ops = &nfs4_layoutget_call_ops,
7764                 .callback_data = lgp,
7765                 .flags = RPC_TASK_ASYNC,
7766         };
7767         struct pnfs_layout_segment *lseg = NULL;
7768         int status = 0;
7769
7770         dprintk("--> %s\n", __func__);
7771
7772         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7773         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7774
7775         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7776         if (!lgp->args.layout.pages) {
7777                 nfs4_layoutget_release(lgp);
7778                 return ERR_PTR(-ENOMEM);
7779         }
7780         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7781         lgp->args.timestamp = jiffies;
7782
7783         lgp->res.layoutp = &lgp->args.layout;
7784         lgp->res.seq_res.sr_slot = NULL;
7785         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7786
7787         task = rpc_run_task(&task_setup_data);
7788         if (IS_ERR(task))
7789                 return ERR_CAST(task);
7790         status = nfs4_wait_for_completion_rpc_task(task);
7791         if (status == 0)
7792                 status = task->tk_status;
7793         trace_nfs4_layoutget(lgp->args.ctx,
7794                         &lgp->args.range,
7795                         &lgp->res.range,
7796                         status);
7797         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7798         if (status == 0 && lgp->res.layoutp->len)
7799                 lseg = pnfs_layout_process(lgp);
7800         rpc_put_task(task);
7801         dprintk("<-- %s status=%d\n", __func__, status);
7802         if (status)
7803                 return ERR_PTR(status);
7804         return lseg;
7805 }
7806
7807 static void
7808 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7809 {
7810         struct nfs4_layoutreturn *lrp = calldata;
7811
7812         dprintk("--> %s\n", __func__);
7813         nfs41_setup_sequence(lrp->clp->cl_session,
7814                         &lrp->args.seq_args,
7815                         &lrp->res.seq_res,
7816                         task);
7817 }
7818
7819 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7820 {
7821         struct nfs4_layoutreturn *lrp = calldata;
7822         struct nfs_server *server;
7823
7824         dprintk("--> %s\n", __func__);
7825
7826         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7827                 return;
7828
7829         server = NFS_SERVER(lrp->args.inode);
7830         switch (task->tk_status) {
7831         default:
7832                 task->tk_status = 0;
7833         case 0:
7834                 break;
7835         case -NFS4ERR_DELAY:
7836                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7837                         break;
7838                 rpc_restart_call_prepare(task);
7839                 return;
7840         }
7841         dprintk("<-- %s\n", __func__);
7842 }
7843
7844 static void nfs4_layoutreturn_release(void *calldata)
7845 {
7846         struct nfs4_layoutreturn *lrp = calldata;
7847         struct pnfs_layout_hdr *lo = lrp->args.layout;
7848
7849         dprintk("--> %s\n", __func__);
7850         spin_lock(&lo->plh_inode->i_lock);
7851         if (lrp->res.lrs_present)
7852                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7853         pnfs_clear_layoutreturn_waitbit(lo);
7854         clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
7855         rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
7856         lo->plh_block_lgets--;
7857         spin_unlock(&lo->plh_inode->i_lock);
7858         pnfs_put_layout_hdr(lrp->args.layout);
7859         nfs_iput_and_deactive(lrp->inode);
7860         kfree(calldata);
7861         dprintk("<-- %s\n", __func__);
7862 }
7863
7864 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7865         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7866         .rpc_call_done = nfs4_layoutreturn_done,
7867         .rpc_release = nfs4_layoutreturn_release,
7868 };
7869
7870 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
7871 {
7872         struct rpc_task *task;
7873         struct rpc_message msg = {
7874                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7875                 .rpc_argp = &lrp->args,
7876                 .rpc_resp = &lrp->res,
7877                 .rpc_cred = lrp->cred,
7878         };
7879         struct rpc_task_setup task_setup_data = {
7880                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7881                 .rpc_message = &msg,
7882                 .callback_ops = &nfs4_layoutreturn_call_ops,
7883                 .callback_data = lrp,
7884         };
7885         int status = 0;
7886
7887         dprintk("--> %s\n", __func__);
7888         if (!sync) {
7889                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
7890                 if (!lrp->inode) {
7891                         nfs4_layoutreturn_release(lrp);
7892                         return -EAGAIN;
7893                 }
7894                 task_setup_data.flags |= RPC_TASK_ASYNC;
7895         }
7896         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7897         task = rpc_run_task(&task_setup_data);
7898         if (IS_ERR(task))
7899                 return PTR_ERR(task);
7900         if (sync)
7901                 status = task->tk_status;
7902         trace_nfs4_layoutreturn(lrp->args.inode, status);
7903         dprintk("<-- %s status=%d\n", __func__, status);
7904         rpc_put_task(task);
7905         return status;
7906 }
7907
7908 static int
7909 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7910                 struct pnfs_device *pdev,
7911                 struct rpc_cred *cred)
7912 {
7913         struct nfs4_getdeviceinfo_args args = {
7914                 .pdev = pdev,
7915         };
7916         struct nfs4_getdeviceinfo_res res = {
7917                 .pdev = pdev,
7918         };
7919         struct rpc_message msg = {
7920                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7921                 .rpc_argp = &args,
7922                 .rpc_resp = &res,
7923                 .rpc_cred = cred,
7924         };
7925         int status;
7926
7927         dprintk("--> %s\n", __func__);
7928         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7929         dprintk("<-- %s status=%d\n", __func__, status);
7930
7931         return status;
7932 }
7933
7934 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7935                 struct pnfs_device *pdev,
7936                 struct rpc_cred *cred)
7937 {
7938         struct nfs4_exception exception = { };
7939         int err;
7940
7941         do {
7942                 err = nfs4_handle_exception(server,
7943                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7944                                         &exception);
7945         } while (exception.retry);
7946         return err;
7947 }
7948 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7949
7950 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7951 {
7952         struct nfs4_layoutcommit_data *data = calldata;
7953         struct nfs_server *server = NFS_SERVER(data->args.inode);
7954         struct nfs4_session *session = nfs4_get_session(server);
7955
7956         nfs41_setup_sequence(session,
7957                         &data->args.seq_args,
7958                         &data->res.seq_res,
7959                         task);
7960 }
7961
7962 static void
7963 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7964 {
7965         struct nfs4_layoutcommit_data *data = calldata;
7966         struct nfs_server *server = NFS_SERVER(data->args.inode);
7967
7968         if (!nfs41_sequence_done(task, &data->res.seq_res))
7969                 return;
7970
7971         switch (task->tk_status) { /* Just ignore these failures */
7972         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7973         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7974         case -NFS4ERR_BADLAYOUT:     /* no layout */
7975         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7976                 task->tk_status = 0;
7977         case 0:
7978                 break;
7979         default:
7980                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
7981                         rpc_restart_call_prepare(task);
7982                         return;
7983                 }
7984         }
7985 }
7986
7987 static void nfs4_layoutcommit_release(void *calldata)
7988 {
7989         struct nfs4_layoutcommit_data *data = calldata;
7990
7991         pnfs_cleanup_layoutcommit(data);
7992         nfs_post_op_update_inode_force_wcc(data->args.inode,
7993                                            data->res.fattr);
7994         put_rpccred(data->cred);
7995         nfs_iput_and_deactive(data->inode);
7996         kfree(data);
7997 }
7998
7999 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8000         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8001         .rpc_call_done = nfs4_layoutcommit_done,
8002         .rpc_release = nfs4_layoutcommit_release,
8003 };
8004
8005 int
8006 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8007 {
8008         struct rpc_message msg = {
8009                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8010                 .rpc_argp = &data->args,
8011                 .rpc_resp = &data->res,
8012                 .rpc_cred = data->cred,
8013         };
8014         struct rpc_task_setup task_setup_data = {
8015                 .task = &data->task,
8016                 .rpc_client = NFS_CLIENT(data->args.inode),
8017                 .rpc_message = &msg,
8018                 .callback_ops = &nfs4_layoutcommit_ops,
8019                 .callback_data = data,
8020         };
8021         struct rpc_task *task;
8022         int status = 0;
8023
8024         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
8025                 "lbw: %llu inode %lu\n",
8026                 data->task.tk_pid, sync,
8027                 data->args.lastbytewritten,
8028                 data->args.inode->i_ino);
8029
8030         if (!sync) {
8031                 data->inode = nfs_igrab_and_active(data->args.inode);
8032                 if (data->inode == NULL) {
8033                         nfs4_layoutcommit_release(data);
8034                         return -EAGAIN;
8035                 }
8036                 task_setup_data.flags = RPC_TASK_ASYNC;
8037         }
8038         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8039         task = rpc_run_task(&task_setup_data);
8040         if (IS_ERR(task))
8041                 return PTR_ERR(task);
8042         if (sync)
8043                 status = task->tk_status;
8044         trace_nfs4_layoutcommit(data->args.inode, status);
8045         dprintk("%s: status %d\n", __func__, status);
8046         rpc_put_task(task);
8047         return status;
8048 }
8049
8050 /**
8051  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8052  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8053  */
8054 static int
8055 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8056                     struct nfs_fsinfo *info,
8057                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8058 {
8059         struct nfs41_secinfo_no_name_args args = {
8060                 .style = SECINFO_STYLE_CURRENT_FH,
8061         };
8062         struct nfs4_secinfo_res res = {
8063                 .flavors = flavors,
8064         };
8065         struct rpc_message msg = {
8066                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8067                 .rpc_argp = &args,
8068                 .rpc_resp = &res,
8069         };
8070         struct rpc_clnt *clnt = server->client;
8071         struct rpc_cred *cred = NULL;
8072         int status;
8073
8074         if (use_integrity) {
8075                 clnt = server->nfs_client->cl_rpcclient;
8076                 cred = nfs4_get_clid_cred(server->nfs_client);
8077                 msg.rpc_cred = cred;
8078         }
8079
8080         dprintk("--> %s\n", __func__);
8081         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8082                                 &res.seq_res, 0);
8083         dprintk("<-- %s status=%d\n", __func__, status);
8084
8085         if (cred)
8086                 put_rpccred(cred);
8087
8088         return status;
8089 }
8090
8091 static int
8092 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8093                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8094 {
8095         struct nfs4_exception exception = { };
8096         int err;
8097         do {
8098                 /* first try using integrity protection */
8099                 err = -NFS4ERR_WRONGSEC;
8100
8101                 /* try to use integrity protection with machine cred */
8102                 if (_nfs4_is_integrity_protected(server->nfs_client))
8103                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8104                                                           flavors, true);
8105
8106                 /*
8107                  * if unable to use integrity protection, or SECINFO with
8108                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8109                  * disallowed by spec, but exists in deployed servers) use
8110                  * the current filesystem's rpc_client and the user cred.
8111                  */
8112                 if (err == -NFS4ERR_WRONGSEC)
8113                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8114                                                           flavors, false);
8115
8116                 switch (err) {
8117                 case 0:
8118                 case -NFS4ERR_WRONGSEC:
8119                 case -ENOTSUPP:
8120                         goto out;
8121                 default:
8122                         err = nfs4_handle_exception(server, err, &exception);
8123                 }
8124         } while (exception.retry);
8125 out:
8126         return err;
8127 }
8128
8129 static int
8130 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8131                     struct nfs_fsinfo *info)
8132 {
8133         int err;
8134         struct page *page;
8135         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8136         struct nfs4_secinfo_flavors *flavors;
8137         struct nfs4_secinfo4 *secinfo;
8138         int i;
8139
8140         page = alloc_page(GFP_KERNEL);
8141         if (!page) {
8142                 err = -ENOMEM;
8143                 goto out;
8144         }
8145
8146         flavors = page_address(page);
8147         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8148
8149         /*
8150          * Fall back on "guess and check" method if
8151          * the server doesn't support SECINFO_NO_NAME
8152          */
8153         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8154                 err = nfs4_find_root_sec(server, fhandle, info);
8155                 goto out_freepage;
8156         }
8157         if (err)
8158                 goto out_freepage;
8159
8160         for (i = 0; i < flavors->num_flavors; i++) {
8161                 secinfo = &flavors->flavors[i];
8162
8163                 switch (secinfo->flavor) {
8164                 case RPC_AUTH_NULL:
8165                 case RPC_AUTH_UNIX:
8166                 case RPC_AUTH_GSS:
8167                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8168                                         &secinfo->flavor_info);
8169                         break;
8170                 default:
8171                         flavor = RPC_AUTH_MAXFLAVOR;
8172                         break;
8173                 }
8174
8175                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8176                         flavor = RPC_AUTH_MAXFLAVOR;
8177
8178                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8179                         err = nfs4_lookup_root_sec(server, fhandle,
8180                                                    info, flavor);
8181                         if (!err)
8182                                 break;
8183                 }
8184         }
8185
8186         if (flavor == RPC_AUTH_MAXFLAVOR)
8187                 err = -EPERM;
8188
8189 out_freepage:
8190         put_page(page);
8191         if (err == -EACCES)
8192                 return -EPERM;
8193 out:
8194         return err;
8195 }
8196
8197 static int _nfs41_test_stateid(struct nfs_server *server,
8198                 nfs4_stateid *stateid,
8199                 struct rpc_cred *cred)
8200 {
8201         int status;
8202         struct nfs41_test_stateid_args args = {
8203                 .stateid = stateid,
8204         };
8205         struct nfs41_test_stateid_res res;
8206         struct rpc_message msg = {
8207                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8208                 .rpc_argp = &args,
8209                 .rpc_resp = &res,
8210                 .rpc_cred = cred,
8211         };
8212         struct rpc_clnt *rpc_client = server->client;
8213
8214         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8215                 &rpc_client, &msg);
8216
8217         dprintk("NFS call  test_stateid %p\n", stateid);
8218         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8219         nfs4_set_sequence_privileged(&args.seq_args);
8220         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8221                         &args.seq_args, &res.seq_res);
8222         if (status != NFS_OK) {
8223                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8224                 return status;
8225         }
8226         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8227         return -res.status;
8228 }
8229
8230 /**
8231  * nfs41_test_stateid - perform a TEST_STATEID operation
8232  *
8233  * @server: server / transport on which to perform the operation
8234  * @stateid: state ID to test
8235  * @cred: credential
8236  *
8237  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8238  * Otherwise a negative NFS4ERR value is returned if the operation
8239  * failed or the state ID is not currently valid.
8240  */
8241 static int nfs41_test_stateid(struct nfs_server *server,
8242                 nfs4_stateid *stateid,
8243                 struct rpc_cred *cred)
8244 {
8245         struct nfs4_exception exception = { };
8246         int err;
8247         do {
8248                 err = _nfs41_test_stateid(server, stateid, cred);
8249                 if (err != -NFS4ERR_DELAY)
8250                         break;
8251                 nfs4_handle_exception(server, err, &exception);
8252         } while (exception.retry);
8253         return err;
8254 }
8255
8256 struct nfs_free_stateid_data {
8257         struct nfs_server *server;
8258         struct nfs41_free_stateid_args args;
8259         struct nfs41_free_stateid_res res;
8260 };
8261
8262 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8263 {
8264         struct nfs_free_stateid_data *data = calldata;
8265         nfs41_setup_sequence(nfs4_get_session(data->server),
8266                         &data->args.seq_args,
8267                         &data->res.seq_res,
8268                         task);
8269 }
8270
8271 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8272 {
8273         struct nfs_free_stateid_data *data = calldata;
8274
8275         nfs41_sequence_done(task, &data->res.seq_res);
8276
8277         switch (task->tk_status) {
8278         case -NFS4ERR_DELAY:
8279                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8280                         rpc_restart_call_prepare(task);
8281         }
8282 }
8283
8284 static void nfs41_free_stateid_release(void *calldata)
8285 {
8286         kfree(calldata);
8287 }
8288
8289 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8290         .rpc_call_prepare = nfs41_free_stateid_prepare,
8291         .rpc_call_done = nfs41_free_stateid_done,
8292         .rpc_release = nfs41_free_stateid_release,
8293 };
8294
8295 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8296                 nfs4_stateid *stateid,
8297                 struct rpc_cred *cred,
8298                 bool privileged)
8299 {
8300         struct rpc_message msg = {
8301                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8302                 .rpc_cred = cred,
8303         };
8304         struct rpc_task_setup task_setup = {
8305                 .rpc_client = server->client,
8306                 .rpc_message = &msg,
8307                 .callback_ops = &nfs41_free_stateid_ops,
8308                 .flags = RPC_TASK_ASYNC,
8309         };
8310         struct nfs_free_stateid_data *data;
8311
8312         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8313                 &task_setup.rpc_client, &msg);
8314
8315         dprintk("NFS call  free_stateid %p\n", stateid);
8316         data = kmalloc(sizeof(*data), GFP_NOFS);
8317         if (!data)
8318                 return ERR_PTR(-ENOMEM);
8319         data->server = server;
8320         nfs4_stateid_copy(&data->args.stateid, stateid);
8321
8322         task_setup.callback_data = data;
8323
8324         msg.rpc_argp = &data->args;
8325         msg.rpc_resp = &data->res;
8326         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8327         if (privileged)
8328                 nfs4_set_sequence_privileged(&data->args.seq_args);
8329
8330         return rpc_run_task(&task_setup);
8331 }
8332
8333 /**
8334  * nfs41_free_stateid - perform a FREE_STATEID operation
8335  *
8336  * @server: server / transport on which to perform the operation
8337  * @stateid: state ID to release
8338  * @cred: credential
8339  *
8340  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8341  * negative NFS4ERR value is returned.
8342  */
8343 static int nfs41_free_stateid(struct nfs_server *server,
8344                 nfs4_stateid *stateid,
8345                 struct rpc_cred *cred)
8346 {
8347         struct rpc_task *task;
8348         int ret;
8349
8350         task = _nfs41_free_stateid(server, stateid, cred, true);
8351         if (IS_ERR(task))
8352                 return PTR_ERR(task);
8353         ret = rpc_wait_for_completion_task(task);
8354         if (!ret)
8355                 ret = task->tk_status;
8356         rpc_put_task(task);
8357         return ret;
8358 }
8359
8360 static void
8361 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8362 {
8363         struct rpc_task *task;
8364         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8365
8366         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8367         nfs4_free_lock_state(server, lsp);
8368         if (IS_ERR(task))
8369                 return;
8370         rpc_put_task(task);
8371 }
8372
8373 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8374                 const nfs4_stateid *s2)
8375 {
8376         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8377                 return false;
8378
8379         if (s1->seqid == s2->seqid)
8380                 return true;
8381         if (s1->seqid == 0 || s2->seqid == 0)
8382                 return true;
8383
8384         return false;
8385 }
8386
8387 #endif /* CONFIG_NFS_V4_1 */
8388
8389 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8390                 const nfs4_stateid *s2)
8391 {
8392         return nfs4_stateid_match(s1, s2);
8393 }
8394
8395
8396 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8397         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8398         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8399         .recover_open   = nfs4_open_reclaim,
8400         .recover_lock   = nfs4_lock_reclaim,
8401         .establish_clid = nfs4_init_clientid,
8402         .detect_trunking = nfs40_discover_server_trunking,
8403 };
8404
8405 #if defined(CONFIG_NFS_V4_1)
8406 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8407         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8408         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8409         .recover_open   = nfs4_open_reclaim,
8410         .recover_lock   = nfs4_lock_reclaim,
8411         .establish_clid = nfs41_init_clientid,
8412         .reclaim_complete = nfs41_proc_reclaim_complete,
8413         .detect_trunking = nfs41_discover_server_trunking,
8414 };
8415 #endif /* CONFIG_NFS_V4_1 */
8416
8417 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8418         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8419         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8420         .recover_open   = nfs40_open_expired,
8421         .recover_lock   = nfs4_lock_expired,
8422         .establish_clid = nfs4_init_clientid,
8423 };
8424
8425 #if defined(CONFIG_NFS_V4_1)
8426 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8427         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8428         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8429         .recover_open   = nfs41_open_expired,
8430         .recover_lock   = nfs41_lock_expired,
8431         .establish_clid = nfs41_init_clientid,
8432 };
8433 #endif /* CONFIG_NFS_V4_1 */
8434
8435 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8436         .sched_state_renewal = nfs4_proc_async_renew,
8437         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8438         .renew_lease = nfs4_proc_renew,
8439 };
8440
8441 #if defined(CONFIG_NFS_V4_1)
8442 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8443         .sched_state_renewal = nfs41_proc_async_sequence,
8444         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8445         .renew_lease = nfs4_proc_sequence,
8446 };
8447 #endif
8448
8449 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8450         .get_locations = _nfs40_proc_get_locations,
8451         .fsid_present = _nfs40_proc_fsid_present,
8452 };
8453
8454 #if defined(CONFIG_NFS_V4_1)
8455 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8456         .get_locations = _nfs41_proc_get_locations,
8457         .fsid_present = _nfs41_proc_fsid_present,
8458 };
8459 #endif  /* CONFIG_NFS_V4_1 */
8460
8461 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8462         .minor_version = 0,
8463         .init_caps = NFS_CAP_READDIRPLUS
8464                 | NFS_CAP_ATOMIC_OPEN
8465                 | NFS_CAP_CHANGE_ATTR
8466                 | NFS_CAP_POSIX_LOCK,
8467         .init_client = nfs40_init_client,
8468         .shutdown_client = nfs40_shutdown_client,
8469         .match_stateid = nfs4_match_stateid,
8470         .find_root_sec = nfs4_find_root_sec,
8471         .free_lock_state = nfs4_release_lockowner,
8472         .alloc_seqid = nfs_alloc_seqid,
8473         .call_sync_ops = &nfs40_call_sync_ops,
8474         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8475         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8476         .state_renewal_ops = &nfs40_state_renewal_ops,
8477         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8478 };
8479
8480 #if defined(CONFIG_NFS_V4_1)
8481 static struct nfs_seqid *
8482 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8483 {
8484         return NULL;
8485 }
8486
8487 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8488         .minor_version = 1,
8489         .init_caps = NFS_CAP_READDIRPLUS
8490                 | NFS_CAP_ATOMIC_OPEN
8491                 | NFS_CAP_CHANGE_ATTR
8492                 | NFS_CAP_POSIX_LOCK
8493                 | NFS_CAP_STATEID_NFSV41
8494                 | NFS_CAP_ATOMIC_OPEN_V1,
8495         .init_client = nfs41_init_client,
8496         .shutdown_client = nfs41_shutdown_client,
8497         .match_stateid = nfs41_match_stateid,
8498         .find_root_sec = nfs41_find_root_sec,
8499         .free_lock_state = nfs41_free_lock_state,
8500         .alloc_seqid = nfs_alloc_no_seqid,
8501         .call_sync_ops = &nfs41_call_sync_ops,
8502         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8503         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8504         .state_renewal_ops = &nfs41_state_renewal_ops,
8505         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8506 };
8507 #endif
8508
8509 #if defined(CONFIG_NFS_V4_2)
8510 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8511         .minor_version = 2,
8512         .init_caps = NFS_CAP_READDIRPLUS
8513                 | NFS_CAP_ATOMIC_OPEN
8514                 | NFS_CAP_CHANGE_ATTR
8515                 | NFS_CAP_POSIX_LOCK
8516                 | NFS_CAP_STATEID_NFSV41
8517                 | NFS_CAP_ATOMIC_OPEN_V1
8518                 | NFS_CAP_ALLOCATE
8519                 | NFS_CAP_DEALLOCATE
8520                 | NFS_CAP_SEEK,
8521         .init_client = nfs41_init_client,
8522         .shutdown_client = nfs41_shutdown_client,
8523         .match_stateid = nfs41_match_stateid,
8524         .find_root_sec = nfs41_find_root_sec,
8525         .free_lock_state = nfs41_free_lock_state,
8526         .call_sync_ops = &nfs41_call_sync_ops,
8527         .alloc_seqid = nfs_alloc_no_seqid,
8528         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8529         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8530         .state_renewal_ops = &nfs41_state_renewal_ops,
8531 };
8532 #endif
8533
8534 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8535         [0] = &nfs_v4_0_minor_ops,
8536 #if defined(CONFIG_NFS_V4_1)
8537         [1] = &nfs_v4_1_minor_ops,
8538 #endif
8539 #if defined(CONFIG_NFS_V4_2)
8540         [2] = &nfs_v4_2_minor_ops,
8541 #endif
8542 };
8543
8544 static const struct inode_operations nfs4_dir_inode_operations = {
8545         .create         = nfs_create,
8546         .lookup         = nfs_lookup,
8547         .atomic_open    = nfs_atomic_open,
8548         .link           = nfs_link,
8549         .unlink         = nfs_unlink,
8550         .symlink        = nfs_symlink,
8551         .mkdir          = nfs_mkdir,
8552         .rmdir          = nfs_rmdir,
8553         .mknod          = nfs_mknod,
8554         .rename         = nfs_rename,
8555         .permission     = nfs_permission,
8556         .getattr        = nfs_getattr,
8557         .setattr        = nfs_setattr,
8558         .getxattr       = generic_getxattr,
8559         .setxattr       = generic_setxattr,
8560         .listxattr      = generic_listxattr,
8561         .removexattr    = generic_removexattr,
8562 };
8563
8564 static const struct inode_operations nfs4_file_inode_operations = {
8565         .permission     = nfs_permission,
8566         .getattr        = nfs_getattr,
8567         .setattr        = nfs_setattr,
8568         .getxattr       = generic_getxattr,
8569         .setxattr       = generic_setxattr,
8570         .listxattr      = generic_listxattr,
8571         .removexattr    = generic_removexattr,
8572 };
8573
8574 const struct nfs_rpc_ops nfs_v4_clientops = {
8575         .version        = 4,                    /* protocol version */
8576         .dentry_ops     = &nfs4_dentry_operations,
8577         .dir_inode_ops  = &nfs4_dir_inode_operations,
8578         .file_inode_ops = &nfs4_file_inode_operations,
8579         .file_ops       = &nfs4_file_operations,
8580         .getroot        = nfs4_proc_get_root,
8581         .submount       = nfs4_submount,
8582         .try_mount      = nfs4_try_mount,
8583         .getattr        = nfs4_proc_getattr,
8584         .setattr        = nfs4_proc_setattr,
8585         .lookup         = nfs4_proc_lookup,
8586         .access         = nfs4_proc_access,
8587         .readlink       = nfs4_proc_readlink,
8588         .create         = nfs4_proc_create,
8589         .remove         = nfs4_proc_remove,
8590         .unlink_setup   = nfs4_proc_unlink_setup,
8591         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8592         .unlink_done    = nfs4_proc_unlink_done,
8593         .rename_setup   = nfs4_proc_rename_setup,
8594         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8595         .rename_done    = nfs4_proc_rename_done,
8596         .link           = nfs4_proc_link,
8597         .symlink        = nfs4_proc_symlink,
8598         .mkdir          = nfs4_proc_mkdir,
8599         .rmdir          = nfs4_proc_remove,
8600         .readdir        = nfs4_proc_readdir,
8601         .mknod          = nfs4_proc_mknod,
8602         .statfs         = nfs4_proc_statfs,
8603         .fsinfo         = nfs4_proc_fsinfo,
8604         .pathconf       = nfs4_proc_pathconf,
8605         .set_capabilities = nfs4_server_capabilities,
8606         .decode_dirent  = nfs4_decode_dirent,
8607         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8608         .read_setup     = nfs4_proc_read_setup,
8609         .read_done      = nfs4_read_done,
8610         .write_setup    = nfs4_proc_write_setup,
8611         .write_done     = nfs4_write_done,
8612         .commit_setup   = nfs4_proc_commit_setup,
8613         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8614         .commit_done    = nfs4_commit_done,
8615         .lock           = nfs4_proc_lock,
8616         .clear_acl_cache = nfs4_zap_acl_attr,
8617         .close_context  = nfs4_close_context,
8618         .open_context   = nfs4_atomic_open,
8619         .have_delegation = nfs4_have_delegation,
8620         .return_delegation = nfs4_inode_return_delegation,
8621         .alloc_client   = nfs4_alloc_client,
8622         .init_client    = nfs4_init_client,
8623         .free_client    = nfs4_free_client,
8624         .create_server  = nfs4_create_server,
8625         .clone_server   = nfs_clone_server,
8626 };
8627
8628 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8629         .prefix = XATTR_NAME_NFSV4_ACL,
8630         .list   = nfs4_xattr_list_nfs4_acl,
8631         .get    = nfs4_xattr_get_nfs4_acl,
8632         .set    = nfs4_xattr_set_nfs4_acl,
8633 };
8634
8635 const struct xattr_handler *nfs4_xattr_handlers[] = {
8636         &nfs4_xattr_nfs4_acl_handler,
8637 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8638         &nfs4_xattr_nfs4_label_handler,
8639 #endif
8640         NULL
8641 };
8642
8643 /*
8644  * Local variables:
8645  *  c-basic-offset: 8
8646  * End:
8647  */