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         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
 905         nfs_fscache_invalidate(dir);
 906         spin_unlock(&dir->i_lock);
 907 }
 908
 909 struct nfs4_opendata {
 910         struct kref kref;
 911         struct nfs_openargs o_arg;
 912         struct nfs_openres o_res;
 913         struct nfs_open_confirmargs c_arg;
 914         struct nfs_open_confirmres c_res;
 915         struct nfs4_string owner_name;
 916         struct nfs4_string group_name;
 917         struct nfs_fattr f_attr;
 918         struct nfs4_label *f_label;
 919         struct dentry *dir;
 920         struct dentry *dentry;
 921         struct nfs4_state_owner *owner;
 922         struct nfs4_state *state;
 923         struct iattr attrs;
 924         unsigned long timestamp;
 925         unsigned int rpc_done : 1;
 926         unsigned int file_created : 1;
 927         unsigned int is_recover : 1;
 928         int rpc_status;
 929         int cancelled;
 930 };
 931
 932 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 933                 int err, struct nfs4_exception *exception)
 934 {
 935         if (err != -EINVAL)
 936                 return false;
 937         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 938                 return false;
 939         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 940         exception->retry = 1;
 941         return true;
 942 }
 943
 944 static u32
 945 nfs4_map_atomic_open_share(struct nfs_server *server,
 946                 fmode_t fmode, int openflags)
 947 {
 948         u32 res = 0;
 949
 950         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 951         case FMODE_READ:
 952                 res = NFS4_SHARE_ACCESS_READ;
 953                 break;
 954         case FMODE_WRITE:
 955                 res = NFS4_SHARE_ACCESS_WRITE;
 956                 break;
 957         case FMODE_READ|FMODE_WRITE:
 958                 res = NFS4_SHARE_ACCESS_BOTH;
 959         }
 960         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 961                 goto out;
 962         /* Want no delegation if we're using O_DIRECT */
 963         if (openflags & O_DIRECT)
 964                 res |= NFS4_SHARE_WANT_NO_DELEG;
 965 out:
 966         return res;
 967 }
 968
 969 static enum open_claim_type4
 970 nfs4_map_atomic_open_claim(struct nfs_server *server,
 971                 enum open_claim_type4 claim)
 972 {
 973         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 974                 return claim;
 975         switch (claim) {
 976         default:
 977                 return claim;
 978         case NFS4_OPEN_CLAIM_FH:
 979                 return NFS4_OPEN_CLAIM_NULL;
 980         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 981                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 982         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 983                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 984         }
 985 }
 986
 987 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 988 {
 989         p->o_res.f_attr = &p->f_attr;
 990         p->o_res.f_label = p->f_label;
 991         p->o_res.seqid = p->o_arg.seqid;
 992         p->c_res.seqid = p->c_arg.seqid;
 993         p->o_res.server = p->o_arg.server;
 994         p->o_res.access_request = p->o_arg.access;
 995         nfs_fattr_init(&p->f_attr);
 996         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 997 }
 998
 999 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1000                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1001                 const struct iattr *attrs,
1002                 struct nfs4_label *label,
1003                 enum open_claim_type4 claim,
1004                 gfp_t gfp_mask)
1005 {
1006         struct dentry *parent = dget_parent(dentry);
1007         struct inode *dir = parent->d_inode;
1008         struct nfs_server *server = NFS_SERVER(dir);
1009         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1010         struct nfs4_opendata *p;
1011
1012         p = kzalloc(sizeof(*p), gfp_mask);
1013         if (p == NULL)
1014                 goto err;
1015
1016         p->f_label = nfs4_label_alloc(server, gfp_mask);
1017         if (IS_ERR(p->f_label))
1018                 goto err_free_p;
1019
1020         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1021         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1022         if (IS_ERR(p->o_arg.seqid))
1023                 goto err_free_label;
1024         nfs_sb_active(dentry->d_sb);
1025         p->dentry = dget(dentry);
1026         p->dir = parent;
1027         p->owner = sp;
1028         atomic_inc(&sp->so_count);
1029         p->o_arg.open_flags = flags;
1030         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1031         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1032                         fmode, flags);
1033         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1034          * will return permission denied for all bits until close */
1035         if (!(flags & O_EXCL)) {
1036                 /* ask server to check for all possible rights as results
1037                  * are cached */
1038                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1039                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1040         }
1041         p->o_arg.clientid = server->nfs_client->cl_clientid;
1042         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1043         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1044         p->o_arg.name = &dentry->d_name;
1045         p->o_arg.server = server;
1046         p->o_arg.bitmask = nfs4_bitmask(server, label);
1047         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1048         p->o_arg.label = label;
1049         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1050         switch (p->o_arg.claim) {
1051         case NFS4_OPEN_CLAIM_NULL:
1052         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1053         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1054                 p->o_arg.fh = NFS_FH(dir);
1055                 break;
1056         case NFS4_OPEN_CLAIM_PREVIOUS:
1057         case NFS4_OPEN_CLAIM_FH:
1058         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1059         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1060                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1061         }
1062         if (attrs != NULL && attrs->ia_valid != 0) {
1063                 __u32 verf[2];
1064
1065                 p->o_arg.u.attrs = &p->attrs;
1066                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1067
1068                 verf[0] = jiffies;
1069                 verf[1] = current->pid;
1070                 memcpy(p->o_arg.u.verifier.data, verf,
1071                                 sizeof(p->o_arg.u.verifier.data));
1072         }
1073         p->c_arg.fh = &p->o_res.fh;
1074         p->c_arg.stateid = &p->o_res.stateid;
1075         p->c_arg.seqid = p->o_arg.seqid;
1076         nfs4_init_opendata_res(p);
1077         kref_init(&p->kref);
1078         return p;
1079
1080 err_free_label:
1081         nfs4_label_free(p->f_label);
1082 err_free_p:
1083         kfree(p);
1084 err:
1085         dput(parent);
1086         return NULL;
1087 }
1088
1089 static void nfs4_opendata_free(struct kref *kref)
1090 {
1091         struct nfs4_opendata *p = container_of(kref,
1092                         struct nfs4_opendata, kref);
1093         struct super_block *sb = p->dentry->d_sb;
1094
1095         nfs_free_seqid(p->o_arg.seqid);
1096         if (p->state != NULL)
1097                 nfs4_put_open_state(p->state);
1098         nfs4_put_state_owner(p->owner);
1099
1100         nfs4_label_free(p->f_label);
1101
1102         dput(p->dir);
1103         dput(p->dentry);
1104         nfs_sb_deactive(sb);
1105         nfs_fattr_free_names(&p->f_attr);
1106         kfree(p->f_attr.mdsthreshold);
1107         kfree(p);
1108 }
1109
1110 static void nfs4_opendata_put(struct nfs4_opendata *p)
1111 {
1112         if (p != NULL)
1113                 kref_put(&p->kref, nfs4_opendata_free);
1114 }
1115
1116 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1117 {
1118         int ret;
1119
1120         ret = rpc_wait_for_completion_task(task);
1121         return ret;
1122 }
1123
1124 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1125 {
1126         int ret = 0;
1127
1128         if (open_mode & (O_EXCL|O_TRUNC))
1129                 goto out;
1130         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1131                 case FMODE_READ:
1132                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1133                                 && state->n_rdonly != 0;
1134                         break;
1135                 case FMODE_WRITE:
1136                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1137                                 && state->n_wronly != 0;
1138                         break;
1139                 case FMODE_READ|FMODE_WRITE:
1140                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1141                                 && state->n_rdwr != 0;
1142         }
1143 out:
1144         return ret;
1145 }
1146
1147 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1148 {
1149         if (delegation == NULL)
1150                 return 0;
1151         if ((delegation->type & fmode) != fmode)
1152                 return 0;
1153         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1154                 return 0;
1155         nfs_mark_delegation_referenced(delegation);
1156         return 1;
1157 }
1158
1159 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1160 {
1161         switch (fmode) {
1162                 case FMODE_WRITE:
1163                         state->n_wronly++;
1164                         break;
1165                 case FMODE_READ:
1166                         state->n_rdonly++;
1167                         break;
1168                 case FMODE_READ|FMODE_WRITE:
1169                         state->n_rdwr++;
1170         }
1171         nfs4_state_set_mode_locked(state, state->state | fmode);
1172 }
1173
1174 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1175 {
1176         struct nfs_client *clp = state->owner->so_server->nfs_client;
1177         bool need_recover = false;
1178
1179         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1180                 need_recover = true;
1181         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1182                 need_recover = true;
1183         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1184                 need_recover = true;
1185         if (need_recover)
1186                 nfs4_state_mark_reclaim_nograce(clp, state);
1187 }
1188
1189 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1190                 nfs4_stateid *stateid)
1191 {
1192         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1193                 return true;
1194         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1195                 nfs_test_and_clear_all_open_stateid(state);
1196                 return true;
1197         }
1198         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1199                 return true;
1200         return false;
1201 }
1202
1203 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1204 {
1205         if (state->n_wronly)
1206                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1207         if (state->n_rdonly)
1208                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1209         if (state->n_rdwr)
1210                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1211 }
1212
1213 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1214                 nfs4_stateid *stateid, fmode_t fmode)
1215 {
1216         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1217         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1218         case FMODE_WRITE:
1219                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1220                 break;
1221         case FMODE_READ:
1222                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1223                 break;
1224         case 0:
1225                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1226                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1227                 clear_bit(NFS_OPEN_STATE, &state->flags);
1228         }
1229         if (stateid == NULL)
1230                 return;
1231         /* Handle races with OPEN */
1232         if (!nfs4_stateid_match_other(stateid, &state->open_stateid) ||
1233             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1234                 nfs_resync_open_stateid_locked(state);
1235                 return;
1236         }
1237         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1238                 nfs4_stateid_copy(&state->stateid, stateid);
1239         nfs4_stateid_copy(&state->open_stateid, stateid);
1240 }
1241
1242 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1243 {
1244         write_seqlock(&state->seqlock);
1245         nfs_clear_open_stateid_locked(state, stateid, fmode);
1246         write_sequnlock(&state->seqlock);
1247         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1248                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1249 }
1250
1251 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1252 {
1253         switch (fmode) {
1254                 case FMODE_READ:
1255                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1256                         break;
1257                 case FMODE_WRITE:
1258                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1259                         break;
1260                 case FMODE_READ|FMODE_WRITE:
1261                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1262         }
1263         if (!nfs_need_update_open_stateid(state, stateid))
1264                 return;
1265         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1266                 nfs4_stateid_copy(&state->stateid, stateid);
1267         nfs4_stateid_copy(&state->open_stateid, stateid);
1268 }
1269
1270 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1271 {
1272         /*
1273          * Protect the call to nfs4_state_set_mode_locked and
1274          * serialise the stateid update
1275          */
1276         write_seqlock(&state->seqlock);
1277         if (deleg_stateid != NULL) {
1278                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1279                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1280         }
1281         if (open_stateid != NULL)
1282                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1283         write_sequnlock(&state->seqlock);
1284         spin_lock(&state->owner->so_lock);
1285         update_open_stateflags(state, fmode);
1286         spin_unlock(&state->owner->so_lock);
1287 }
1288
1289 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1290 {
1291         struct nfs_inode *nfsi = NFS_I(state->inode);
1292         struct nfs_delegation *deleg_cur;
1293         int ret = 0;
1294
1295         fmode &= (FMODE_READ|FMODE_WRITE);
1296
1297         rcu_read_lock();
1298         deleg_cur = rcu_dereference(nfsi->delegation);
1299         if (deleg_cur == NULL)
1300                 goto no_delegation;
1301
1302         spin_lock(&deleg_cur->lock);
1303         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1304            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1305             (deleg_cur->type & fmode) != fmode)
1306                 goto no_delegation_unlock;
1307
1308         if (delegation == NULL)
1309                 delegation = &deleg_cur->stateid;
1310         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1311                 goto no_delegation_unlock;
1312
1313         nfs_mark_delegation_referenced(deleg_cur);
1314         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1315         ret = 1;
1316 no_delegation_unlock:
1317         spin_unlock(&deleg_cur->lock);
1318 no_delegation:
1319         rcu_read_unlock();
1320
1321         if (!ret && open_stateid != NULL) {
1322                 __update_open_stateid(state, open_stateid, NULL, fmode);
1323                 ret = 1;
1324         }
1325         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1326                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1327
1328         return ret;
1329 }
1330
1331 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1332                 const nfs4_stateid *stateid)
1333 {
1334         struct nfs4_state *state = lsp->ls_state;
1335         bool ret = false;
1336
1337         spin_lock(&state->state_lock);
1338         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1339                 goto out_noupdate;
1340         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1341                 goto out_noupdate;
1342         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1343         ret = true;
1344 out_noupdate:
1345         spin_unlock(&state->state_lock);
1346         return ret;
1347 }
1348
1349 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1350 {
1351         struct nfs_delegation *delegation;
1352
1353         rcu_read_lock();
1354         delegation = rcu_dereference(NFS_I(inode)->delegation);
1355         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1356                 rcu_read_unlock();
1357                 return;
1358         }
1359         rcu_read_unlock();
1360         nfs4_inode_return_delegation(inode);
1361 }
1362
1363 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1364 {
1365         struct nfs4_state *state = opendata->state;
1366         struct nfs_inode *nfsi = NFS_I(state->inode);
1367         struct nfs_delegation *delegation;
1368         int open_mode = opendata->o_arg.open_flags;
1369         fmode_t fmode = opendata->o_arg.fmode;
1370         nfs4_stateid stateid;
1371         int ret = -EAGAIN;
1372
1373         for (;;) {
1374                 spin_lock(&state->owner->so_lock);
1375                 if (can_open_cached(state, fmode, open_mode)) {
1376                         update_open_stateflags(state, fmode);
1377                         spin_unlock(&state->owner->so_lock);
1378                         goto out_return_state;
1379                 }
1380                 spin_unlock(&state->owner->so_lock);
1381                 rcu_read_lock();
1382                 delegation = rcu_dereference(nfsi->delegation);
1383                 if (!can_open_delegated(delegation, fmode)) {
1384                         rcu_read_unlock();
1385                         break;
1386                 }
1387                 /* Save the delegation */
1388                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1389                 rcu_read_unlock();
1390                 nfs_release_seqid(opendata->o_arg.seqid);
1391                 if (!opendata->is_recover) {
1392                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1393                         if (ret != 0)
1394                                 goto out;
1395                 }
1396                 ret = -EAGAIN;
1397
1398                 /* Try to update the stateid using the delegation */
1399                 if (update_open_stateid(state, NULL, &stateid, fmode))
1400                         goto out_return_state;
1401         }
1402 out:
1403         return ERR_PTR(ret);
1404 out_return_state:
1405         atomic_inc(&state->count);
1406         return state;
1407 }
1408
1409 static void
1410 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1411 {
1412         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1413         struct nfs_delegation *delegation;
1414         int delegation_flags = 0;
1415
1416         rcu_read_lock();
1417         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1418         if (delegation)
1419                 delegation_flags = delegation->flags;
1420         rcu_read_unlock();
1421         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1422                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1423                                    "returning a delegation for "
1424                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1425                                    clp->cl_hostname);
1426         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1427                 nfs_inode_set_delegation(state->inode,
1428                                          data->owner->so_cred,
1429                                          &data->o_res);
1430         else
1431                 nfs_inode_reclaim_delegation(state->inode,
1432                                              data->owner->so_cred,
1433                                              &data->o_res);
1434 }
1435
1436 /*
1437  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1438  * and update the nfs4_state.
1439  */
1440 static struct nfs4_state *
1441 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1442 {
1443         struct inode *inode = data->state->inode;
1444         struct nfs4_state *state = data->state;
1445         int ret;
1446
1447         if (!data->rpc_done) {
1448                 if (data->rpc_status) {
1449                         ret = data->rpc_status;
1450                         goto err;
1451                 }
1452                 /* cached opens have already been processed */
1453                 goto update;
1454         }
1455
1456         ret = nfs_refresh_inode(inode, &data->f_attr);
1457         if (ret)
1458                 goto err;
1459
1460         if (data->o_res.delegation_type != 0)
1461                 nfs4_opendata_check_deleg(data, state);
1462 update:
1463         update_open_stateid(state, &data->o_res.stateid, NULL,
1464                             data->o_arg.fmode);
1465         atomic_inc(&state->count);
1466
1467         return state;
1468 err:
1469         return ERR_PTR(ret);
1470
1471 }
1472
1473 static struct nfs4_state *
1474 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1475 {
1476         struct inode *inode;
1477         struct nfs4_state *state = NULL;
1478         int ret;
1479
1480         if (!data->rpc_done) {
1481                 state = nfs4_try_open_cached(data);
1482                 goto out;
1483         }
1484
1485         ret = -EAGAIN;
1486         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1487                 goto err;
1488         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1489         ret = PTR_ERR(inode);
1490         if (IS_ERR(inode))
1491                 goto err;
1492         ret = -ENOMEM;
1493         state = nfs4_get_open_state(inode, data->owner);
1494         if (state == NULL)
1495                 goto err_put_inode;
1496         if (data->o_res.delegation_type != 0)
1497                 nfs4_opendata_check_deleg(data, state);
1498         update_open_stateid(state, &data->o_res.stateid, NULL,
1499                         data->o_arg.fmode);
1500         iput(inode);
1501 out:
1502         nfs_release_seqid(data->o_arg.seqid);
1503         return state;
1504 err_put_inode:
1505         iput(inode);
1506 err:
1507         return ERR_PTR(ret);
1508 }
1509
1510 static struct nfs4_state *
1511 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1512 {
1513         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1514                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1515         return _nfs4_opendata_to_nfs4_state(data);
1516 }
1517
1518 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1519 {
1520         struct nfs_inode *nfsi = NFS_I(state->inode);
1521         struct nfs_open_context *ctx;
1522
1523         spin_lock(&state->inode->i_lock);
1524         list_for_each_entry(ctx, &nfsi->open_files, list) {
1525                 if (ctx->state != state)
1526                         continue;
1527                 get_nfs_open_context(ctx);
1528                 spin_unlock(&state->inode->i_lock);
1529                 return ctx;
1530         }
1531         spin_unlock(&state->inode->i_lock);
1532         return ERR_PTR(-ENOENT);
1533 }
1534
1535 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1536                 struct nfs4_state *state, enum open_claim_type4 claim)
1537 {
1538         struct nfs4_opendata *opendata;
1539
1540         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1541                         NULL, NULL, claim, GFP_NOFS);
1542         if (opendata == NULL)
1543                 return ERR_PTR(-ENOMEM);
1544         opendata->state = state;
1545         atomic_inc(&state->count);
1546         return opendata;
1547 }
1548
1549 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1550 {
1551         struct nfs4_state *newstate;
1552         int ret;
1553
1554         opendata->o_arg.open_flags = 0;
1555         opendata->o_arg.fmode = fmode;
1556         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1557                         NFS_SB(opendata->dentry->d_sb),
1558                         fmode, 0);
1559         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1560         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1561         nfs4_init_opendata_res(opendata);
1562         ret = _nfs4_recover_proc_open(opendata);
1563         if (ret != 0)
1564                 return ret;
1565         newstate = nfs4_opendata_to_nfs4_state(opendata);
1566         if (IS_ERR(newstate))
1567                 return PTR_ERR(newstate);
1568         nfs4_close_state(newstate, fmode);
1569         *res = newstate;
1570         return 0;
1571 }
1572
1573 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1574 {
1575         struct nfs4_state *newstate;
1576         int ret;
1577
1578         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1579         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1580         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1581         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1582         /* memory barrier prior to reading state->n_* */
1583         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1584         clear_bit(NFS_OPEN_STATE, &state->flags);
1585         smp_rmb();
1586         if (state->n_rdwr != 0) {
1587                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1588                 if (ret != 0)
1589                         return ret;
1590                 if (newstate != state)
1591                         return -ESTALE;
1592         }
1593         if (state->n_wronly != 0) {
1594                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1595                 if (ret != 0)
1596                         return ret;
1597                 if (newstate != state)
1598                         return -ESTALE;
1599         }
1600         if (state->n_rdonly != 0) {
1601                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1602                 if (ret != 0)
1603                         return ret;
1604                 if (newstate != state)
1605                         return -ESTALE;
1606         }
1607         /*
1608          * We may have performed cached opens for all three recoveries.
1609          * Check if we need to update the current stateid.
1610          */
1611         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1612             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1613                 write_seqlock(&state->seqlock);
1614                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1615                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1616                 write_sequnlock(&state->seqlock);
1617         }
1618         return 0;
1619 }
1620
1621 /*
1622  * OPEN_RECLAIM:
1623  *      reclaim state on the server after a reboot.
1624  */
1625 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1626 {
1627         struct nfs_delegation *delegation;
1628         struct nfs4_opendata *opendata;
1629         fmode_t delegation_type = 0;
1630         int status;
1631
1632         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1633                         NFS4_OPEN_CLAIM_PREVIOUS);
1634         if (IS_ERR(opendata))
1635                 return PTR_ERR(opendata);
1636         rcu_read_lock();
1637         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1638         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1639                 delegation_type = delegation->type;
1640         rcu_read_unlock();
1641         opendata->o_arg.u.delegation_type = delegation_type;
1642         status = nfs4_open_recover(opendata, state);
1643         nfs4_opendata_put(opendata);
1644         return status;
1645 }
1646
1647 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1648 {
1649         struct nfs_server *server = NFS_SERVER(state->inode);
1650         struct nfs4_exception exception = { };
1651         int err;
1652         do {
1653                 err = _nfs4_do_open_reclaim(ctx, state);
1654                 trace_nfs4_open_reclaim(ctx, 0, err);
1655                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1656                         continue;
1657                 if (err != -NFS4ERR_DELAY)
1658                         break;
1659                 nfs4_handle_exception(server, err, &exception);
1660         } while (exception.retry);
1661         return err;
1662 }
1663
1664 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1665 {
1666         struct nfs_open_context *ctx;
1667         int ret;
1668
1669         ctx = nfs4_state_find_open_context(state);
1670         if (IS_ERR(ctx))
1671                 return -EAGAIN;
1672         ret = nfs4_do_open_reclaim(ctx, state);
1673         put_nfs_open_context(ctx);
1674         return ret;
1675 }
1676
1677 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1678 {
1679         switch (err) {
1680                 default:
1681                         printk(KERN_ERR "NFS: %s: unhandled error "
1682                                         "%d.\n", __func__, err);
1683                 case 0:
1684                 case -ENOENT:
1685                 case -ESTALE:
1686                         break;
1687                 case -NFS4ERR_BADSESSION:
1688                 case -NFS4ERR_BADSLOT:
1689                 case -NFS4ERR_BAD_HIGH_SLOT:
1690                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1691                 case -NFS4ERR_DEADSESSION:
1692                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1693                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1694                         return -EAGAIN;
1695                 case -NFS4ERR_STALE_CLIENTID:
1696                 case -NFS4ERR_STALE_STATEID:
1697                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1698                 case -NFS4ERR_EXPIRED:
1699                         /* Don't recall a delegation if it was lost */
1700                         nfs4_schedule_lease_recovery(server->nfs_client);
1701                         return -EAGAIN;
1702                 case -NFS4ERR_MOVED:
1703                         nfs4_schedule_migration_recovery(server);
1704                         return -EAGAIN;
1705                 case -NFS4ERR_LEASE_MOVED:
1706                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1707                         return -EAGAIN;
1708                 case -NFS4ERR_DELEG_REVOKED:
1709                 case -NFS4ERR_ADMIN_REVOKED:
1710                 case -NFS4ERR_BAD_STATEID:
1711                 case -NFS4ERR_OPENMODE:
1712                         nfs_inode_find_state_and_recover(state->inode,
1713                                         stateid);
1714                         nfs4_schedule_stateid_recovery(server, state);
1715                         return -EAGAIN;
1716                 case -NFS4ERR_DELAY:
1717                 case -NFS4ERR_GRACE:
1718                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1719                         ssleep(1);
1720                         return -EAGAIN;
1721                 case -ENOMEM:
1722                 case -NFS4ERR_DENIED:
1723                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1724                         return 0;
1725         }
1726         return err;
1727 }
1728
1729 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1730 {
1731         struct nfs_server *server = NFS_SERVER(state->inode);
1732         struct nfs4_opendata *opendata;
1733         int err;
1734
1735         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1736                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1737         if (IS_ERR(opendata))
1738                 return PTR_ERR(opendata);
1739         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1740         err = nfs4_open_recover(opendata, state);
1741         nfs4_opendata_put(opendata);
1742         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1743 }
1744
1745 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1746 {
1747         struct nfs4_opendata *data = calldata;
1748
1749         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1750                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1751 }
1752
1753 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1754 {
1755         struct nfs4_opendata *data = calldata;
1756
1757         nfs40_sequence_done(task, &data->c_res.seq_res);
1758
1759         data->rpc_status = task->tk_status;
1760         if (data->rpc_status == 0) {
1761                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1762                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1763                 renew_lease(data->o_res.server, data->timestamp);
1764                 data->rpc_done = 1;
1765         }
1766 }
1767
1768 static void nfs4_open_confirm_release(void *calldata)
1769 {
1770         struct nfs4_opendata *data = calldata;
1771         struct nfs4_state *state = NULL;
1772
1773         /* If this request hasn't been cancelled, do nothing */
1774         if (data->cancelled == 0)
1775                 goto out_free;
1776         /* In case of error, no cleanup! */
1777         if (!data->rpc_done)
1778                 goto out_free;
1779         state = nfs4_opendata_to_nfs4_state(data);
1780         if (!IS_ERR(state))
1781                 nfs4_close_state(state, data->o_arg.fmode);
1782 out_free:
1783         nfs4_opendata_put(data);
1784 }
1785
1786 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1787         .rpc_call_prepare = nfs4_open_confirm_prepare,
1788         .rpc_call_done = nfs4_open_confirm_done,
1789         .rpc_release = nfs4_open_confirm_release,
1790 };
1791
1792 /*
1793  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1794  */
1795 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1796 {
1797         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1798         struct rpc_task *task;
1799         struct  rpc_message msg = {
1800                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1801                 .rpc_argp = &data->c_arg,
1802                 .rpc_resp = &data->c_res,
1803                 .rpc_cred = data->owner->so_cred,
1804         };
1805         struct rpc_task_setup task_setup_data = {
1806                 .rpc_client = server->client,
1807                 .rpc_message = &msg,
1808                 .callback_ops = &nfs4_open_confirm_ops,
1809                 .callback_data = data,
1810                 .workqueue = nfsiod_workqueue,
1811                 .flags = RPC_TASK_ASYNC,
1812         };
1813         int status;
1814
1815         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1816         kref_get(&data->kref);
1817         data->rpc_done = 0;
1818         data->rpc_status = 0;
1819         data->timestamp = jiffies;
1820         task = rpc_run_task(&task_setup_data);
1821         if (IS_ERR(task))
1822                 return PTR_ERR(task);
1823         status = nfs4_wait_for_completion_rpc_task(task);
1824         if (status != 0) {
1825                 data->cancelled = 1;
1826                 smp_wmb();
1827         } else
1828                 status = data->rpc_status;
1829         rpc_put_task(task);
1830         return status;
1831 }
1832
1833 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1834 {
1835         struct nfs4_opendata *data = calldata;
1836         struct nfs4_state_owner *sp = data->owner;
1837         struct nfs_client *clp = sp->so_server->nfs_client;
1838
1839         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1840                 goto out_wait;
1841         /*
1842          * Check if we still need to send an OPEN call, or if we can use
1843          * a delegation instead.
1844          */
1845         if (data->state != NULL) {
1846                 struct nfs_delegation *delegation;
1847
1848                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1849                         goto out_no_action;
1850                 rcu_read_lock();
1851                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1852                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1853                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1854                     can_open_delegated(delegation, data->o_arg.fmode))
1855                         goto unlock_no_action;
1856                 rcu_read_unlock();
1857         }
1858         /* Update client id. */
1859         data->o_arg.clientid = clp->cl_clientid;
1860         switch (data->o_arg.claim) {
1861         case NFS4_OPEN_CLAIM_PREVIOUS:
1862         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1863         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1864                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1865         case NFS4_OPEN_CLAIM_FH:
1866                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1867                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1868         }
1869         data->timestamp = jiffies;
1870         if (nfs4_setup_sequence(data->o_arg.server,
1871                                 &data->o_arg.seq_args,
1872                                 &data->o_res.seq_res,
1873                                 task) != 0)
1874                 nfs_release_seqid(data->o_arg.seqid);
1875
1876         /* Set the create mode (note dependency on the session type) */
1877         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1878         if (data->o_arg.open_flags & O_EXCL) {
1879                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1880                 if (nfs4_has_persistent_session(clp))
1881                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1882                 else if (clp->cl_mvops->minor_version > 0)
1883                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1884         }
1885         return;
1886 unlock_no_action:
1887         rcu_read_unlock();
1888 out_no_action:
1889         task->tk_action = NULL;
1890 out_wait:
1891         nfs4_sequence_done(task, &data->o_res.seq_res);
1892 }
1893
1894 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1895 {
1896         struct nfs4_opendata *data = calldata;
1897
1898         data->rpc_status = task->tk_status;
1899
1900         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1901                 return;
1902
1903         if (task->tk_status == 0) {
1904                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1905                         switch (data->o_res.f_attr->mode & S_IFMT) {
1906                         case S_IFREG:
1907                                 break;
1908                         case S_IFLNK:
1909                                 data->rpc_status = -ELOOP;
1910                                 break;
1911                         case S_IFDIR:
1912                                 data->rpc_status = -EISDIR;
1913                                 break;
1914                         default:
1915                                 data->rpc_status = -ENOTDIR;
1916                         }
1917                 }
1918                 renew_lease(data->o_res.server, data->timestamp);
1919                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1920                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1921         }
1922         data->rpc_done = 1;
1923 }
1924
1925 static void nfs4_open_release(void *calldata)
1926 {
1927         struct nfs4_opendata *data = calldata;
1928         struct nfs4_state *state = NULL;
1929
1930         /* If this request hasn't been cancelled, do nothing */
1931         if (data->cancelled == 0)
1932                 goto out_free;
1933         /* In case of error, no cleanup! */
1934         if (data->rpc_status != 0 || !data->rpc_done)
1935                 goto out_free;
1936         /* In case we need an open_confirm, no cleanup! */
1937         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1938                 goto out_free;
1939         state = nfs4_opendata_to_nfs4_state(data);
1940         if (!IS_ERR(state))
1941                 nfs4_close_state(state, data->o_arg.fmode);
1942 out_free:
1943         nfs4_opendata_put(data);
1944 }
1945
1946 static const struct rpc_call_ops nfs4_open_ops = {
1947         .rpc_call_prepare = nfs4_open_prepare,
1948         .rpc_call_done = nfs4_open_done,
1949         .rpc_release = nfs4_open_release,
1950 };
1951
1952 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1953 {
1954         struct inode *dir = data->dir->d_inode;
1955         struct nfs_server *server = NFS_SERVER(dir);
1956         struct nfs_openargs *o_arg = &data->o_arg;
1957         struct nfs_openres *o_res = &data->o_res;
1958         struct rpc_task *task;
1959         struct rpc_message msg = {
1960                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1961                 .rpc_argp = o_arg,
1962                 .rpc_resp = o_res,
1963                 .rpc_cred = data->owner->so_cred,
1964         };
1965         struct rpc_task_setup task_setup_data = {
1966                 .rpc_client = server->client,
1967                 .rpc_message = &msg,
1968                 .callback_ops = &nfs4_open_ops,
1969                 .callback_data = data,
1970                 .workqueue = nfsiod_workqueue,
1971                 .flags = RPC_TASK_ASYNC,
1972         };
1973         int status;
1974
1975         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1976         kref_get(&data->kref);
1977         data->rpc_done = 0;
1978         data->rpc_status = 0;
1979         data->cancelled = 0;
1980         data->is_recover = 0;
1981         if (isrecover) {
1982                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1983                 data->is_recover = 1;
1984         }
1985         task = rpc_run_task(&task_setup_data);
1986         if (IS_ERR(task))
1987                 return PTR_ERR(task);
1988         status = nfs4_wait_for_completion_rpc_task(task);
1989         if (status != 0) {
1990                 data->cancelled = 1;
1991                 smp_wmb();
1992         } else
1993                 status = data->rpc_status;
1994         rpc_put_task(task);
1995
1996         return status;
1997 }
1998
1999 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2000 {
2001         struct inode *dir = data->dir->d_inode;
2002         struct nfs_openres *o_res = &data->o_res;
2003         int status;
2004
2005         status = nfs4_run_open_task(data, 1);
2006         if (status != 0 || !data->rpc_done)
2007                 return status;
2008
2009         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2010
2011         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2012                 status = _nfs4_proc_open_confirm(data);
2013                 if (status != 0)
2014                         return status;
2015         }
2016
2017         return status;
2018 }
2019
2020 /*
2021  * Additional permission checks in order to distinguish between an
2022  * open for read, and an open for execute. This works around the
2023  * fact that NFSv4 OPEN treats read and execute permissions as being
2024  * the same.
2025  * Note that in the non-execute case, we want to turn off permission
2026  * checking if we just created a new file (POSIX open() semantics).
2027  */
2028 static int nfs4_opendata_access(struct rpc_cred *cred,
2029                                 struct nfs4_opendata *opendata,
2030                                 struct nfs4_state *state, fmode_t fmode,
2031                                 int openflags)
2032 {
2033         struct nfs_access_entry cache;
2034         u32 mask;
2035
2036         /* access call failed or for some reason the server doesn't
2037          * support any access modes -- defer access call until later */
2038         if (opendata->o_res.access_supported == 0)
2039                 return 0;
2040
2041         mask = 0;
2042         /*
2043          * Use openflags to check for exec, because fmode won't
2044          * always have FMODE_EXEC set when file open for exec.
2045          */
2046         if (openflags & __FMODE_EXEC) {
2047                 /* ONLY check for exec rights */
2048                 mask = MAY_EXEC;
2049         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2050                 mask = MAY_READ;
2051
2052         cache.cred = cred;
2053         cache.jiffies = jiffies;
2054         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2055         nfs_access_add_cache(state->inode, &cache);
2056
2057         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2058                 return 0;
2059
2060         /* even though OPEN succeeded, access is denied. Close the file */
2061         nfs4_close_state(state, fmode);
2062         return -EACCES;
2063 }
2064
2065 /*
2066  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2067  */
2068 static int _nfs4_proc_open(struct nfs4_opendata *data)
2069 {
2070         struct inode *dir = data->dir->d_inode;
2071         struct nfs_server *server = NFS_SERVER(dir);
2072         struct nfs_openargs *o_arg = &data->o_arg;
2073         struct nfs_openres *o_res = &data->o_res;
2074         int status;
2075
2076         status = nfs4_run_open_task(data, 0);
2077         if (!data->rpc_done)
2078                 return status;
2079         if (status != 0) {
2080                 if (status == -NFS4ERR_BADNAME &&
2081                                 !(o_arg->open_flags & O_CREAT))
2082                         return -ENOENT;
2083                 return status;
2084         }
2085
2086         nfs_fattr_map_and_free_names(server, &data->f_attr);
2087
2088         if (o_arg->open_flags & O_CREAT) {
2089                 update_changeattr(dir, &o_res->cinfo);
2090                 if (o_arg->open_flags & O_EXCL)
2091                         data->file_created = 1;
2092                 else if (o_res->cinfo.before != o_res->cinfo.after)
2093                         data->file_created = 1;
2094         }
2095         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2096                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2097         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2098                 status = _nfs4_proc_open_confirm(data);
2099                 if (status != 0)
2100                         return status;
2101         }
2102         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2103                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2104         return 0;
2105 }
2106
2107 static int nfs4_recover_expired_lease(struct nfs_server *server)
2108 {
2109         return nfs4_client_recover_expired_lease(server->nfs_client);
2110 }
2111
2112 /*
2113  * OPEN_EXPIRED:
2114  *      reclaim state on the server after a network partition.
2115  *      Assumes caller holds the appropriate lock
2116  */
2117 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2118 {
2119         struct nfs4_opendata *opendata;
2120         int ret;
2121
2122         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2123                         NFS4_OPEN_CLAIM_FH);
2124         if (IS_ERR(opendata))
2125                 return PTR_ERR(opendata);
2126         ret = nfs4_open_recover(opendata, state);
2127         if (ret == -ESTALE)
2128                 d_drop(ctx->dentry);
2129         nfs4_opendata_put(opendata);
2130         return ret;
2131 }
2132
2133 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2134 {
2135         struct nfs_server *server = NFS_SERVER(state->inode);
2136         struct nfs4_exception exception = { };
2137         int err;
2138
2139         do {
2140                 err = _nfs4_open_expired(ctx, state);
2141                 trace_nfs4_open_expired(ctx, 0, err);
2142                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2143                         continue;
2144                 switch (err) {
2145                 default:
2146                         goto out;
2147                 case -NFS4ERR_GRACE:
2148                 case -NFS4ERR_DELAY:
2149                         nfs4_handle_exception(server, err, &exception);
2150                         err = 0;
2151                 }
2152         } while (exception.retry);
2153 out:
2154         return err;
2155 }
2156
2157 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2158 {
2159         struct nfs_open_context *ctx;
2160         int ret;
2161
2162         ctx = nfs4_state_find_open_context(state);
2163         if (IS_ERR(ctx))
2164                 return -EAGAIN;
2165         ret = nfs4_do_open_expired(ctx, state);
2166         put_nfs_open_context(ctx);
2167         return ret;
2168 }
2169
2170 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2171 {
2172         nfs_remove_bad_delegation(state->inode);
2173         write_seqlock(&state->seqlock);
2174         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2175         write_sequnlock(&state->seqlock);
2176         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2177 }
2178
2179 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2180 {
2181         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2182                 nfs_finish_clear_delegation_stateid(state);
2183 }
2184
2185 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2186 {
2187         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2188         nfs40_clear_delegation_stateid(state);
2189         return nfs4_open_expired(sp, state);
2190 }
2191
2192 #if defined(CONFIG_NFS_V4_1)
2193 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2194 {
2195         struct nfs_server *server = NFS_SERVER(state->inode);
2196         nfs4_stateid stateid;
2197         struct nfs_delegation *delegation;
2198         struct rpc_cred *cred;
2199         int status;
2200
2201         /* Get the delegation credential for use by test/free_stateid */
2202         rcu_read_lock();
2203         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2204         if (delegation == NULL) {
2205                 rcu_read_unlock();
2206                 return;
2207         }
2208
2209         nfs4_stateid_copy(&stateid, &delegation->stateid);
2210         cred = get_rpccred(delegation->cred);
2211         rcu_read_unlock();
2212         status = nfs41_test_stateid(server, &stateid, cred);
2213         trace_nfs4_test_delegation_stateid(state, NULL, status);
2214
2215         if (status != NFS_OK) {
2216                 /* Free the stateid unless the server explicitly
2217                  * informs us the stateid is unrecognized. */
2218                 if (status != -NFS4ERR_BAD_STATEID)
2219                         nfs41_free_stateid(server, &stateid, cred);
2220                 nfs_finish_clear_delegation_stateid(state);
2221         }
2222
2223         put_rpccred(cred);
2224 }
2225
2226 /**
2227  * nfs41_check_open_stateid - possibly free an open stateid
2228  *
2229  * @state: NFSv4 state for an inode
2230  *
2231  * Returns NFS_OK if recovery for this stateid is now finished.
2232  * Otherwise a negative NFS4ERR value is returned.
2233  */
2234 static int nfs41_check_open_stateid(struct nfs4_state *state)
2235 {
2236         struct nfs_server *server = NFS_SERVER(state->inode);
2237         nfs4_stateid *stateid = &state->open_stateid;
2238         struct rpc_cred *cred = state->owner->so_cred;
2239         int status;
2240
2241         /* If a state reset has been done, test_stateid is unneeded */
2242         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2243             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2244             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2245                 return -NFS4ERR_BAD_STATEID;
2246
2247         status = nfs41_test_stateid(server, stateid, cred);
2248         trace_nfs4_test_open_stateid(state, NULL, status);
2249         if (status != NFS_OK) {
2250                 /* Free the stateid unless the server explicitly
2251                  * informs us the stateid is unrecognized. */
2252                 if (status != -NFS4ERR_BAD_STATEID)
2253                         nfs41_free_stateid(server, stateid, cred);
2254
2255                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2256                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2257                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2258                 clear_bit(NFS_OPEN_STATE, &state->flags);
2259         }
2260         return status;
2261 }
2262
2263 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2264 {
2265         int status;
2266
2267         nfs41_check_delegation_stateid(state);
2268         status = nfs41_check_open_stateid(state);
2269         if (status != NFS_OK)
2270                 status = nfs4_open_expired(sp, state);
2271         return status;
2272 }
2273 #endif
2274
2275 /*
2276  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2277  * fields corresponding to attributes that were used to store the verifier.
2278  * Make sure we clobber those fields in the later setattr call
2279  */
2280 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2281 {
2282         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2283             !(sattr->ia_valid & ATTR_ATIME_SET))
2284                 sattr->ia_valid |= ATTR_ATIME;
2285
2286         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2287             !(sattr->ia_valid & ATTR_MTIME_SET))
2288                 sattr->ia_valid |= ATTR_MTIME;
2289 }
2290
2291 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2292                 fmode_t fmode,
2293                 int flags,
2294                 struct nfs_open_context *ctx)
2295 {
2296         struct nfs4_state_owner *sp = opendata->owner;
2297         struct nfs_server *server = sp->so_server;
2298         struct dentry *dentry;
2299         struct nfs4_state *state;
2300         unsigned int seq;
2301         int ret;
2302
2303         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2304
2305         ret = _nfs4_proc_open(opendata);
2306         if (ret != 0)
2307                 goto out;
2308
2309         state = nfs4_opendata_to_nfs4_state(opendata);
2310         ret = PTR_ERR(state);
2311         if (IS_ERR(state))
2312                 goto out;
2313         if (server->caps & NFS_CAP_POSIX_LOCK)
2314                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2315
2316         dentry = opendata->dentry;
2317         if (dentry->d_inode == NULL) {
2318                 /* FIXME: Is this d_drop() ever needed? */
2319                 d_drop(dentry);
2320                 dentry = d_add_unique(dentry, igrab(state->inode));
2321                 if (dentry == NULL) {
2322                         dentry = opendata->dentry;
2323                 } else if (dentry != ctx->dentry) {
2324                         dput(ctx->dentry);
2325                         ctx->dentry = dget(dentry);
2326                 }
2327                 nfs_set_verifier(dentry,
2328                                 nfs_save_change_attribute(opendata->dir->d_inode));
2329         }
2330
2331         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2332         if (ret != 0)
2333                 goto out;
2334
2335         ctx->state = state;
2336         if (dentry->d_inode == state->inode) {
2337                 nfs_inode_attach_open_context(ctx);
2338                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2339                         nfs4_schedule_stateid_recovery(server, state);
2340         }
2341 out:
2342         return ret;
2343 }
2344
2345 /*
2346  * Returns a referenced nfs4_state
2347  */
2348 static int _nfs4_do_open(struct inode *dir,
2349                         struct nfs_open_context *ctx,
2350                         int flags,
2351                         struct iattr *sattr,
2352                         struct nfs4_label *label,
2353                         int *opened)
2354 {
2355         struct nfs4_state_owner  *sp;
2356         struct nfs4_state     *state = NULL;
2357         struct nfs_server       *server = NFS_SERVER(dir);
2358         struct nfs4_opendata *opendata;
2359         struct dentry *dentry = ctx->dentry;
2360         struct rpc_cred *cred = ctx->cred;
2361         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2362         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2363         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2364         struct nfs4_label *olabel = NULL;
2365         int status;
2366
2367         /* Protect against reboot recovery conflicts */
2368         status = -ENOMEM;
2369         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2370         if (sp == NULL) {
2371                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2372                 goto out_err;
2373         }
2374         status = nfs4_recover_expired_lease(server);
2375         if (status != 0)
2376                 goto err_put_state_owner;
2377         if (dentry->d_inode != NULL)
2378                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2379         status = -ENOMEM;
2380         if (dentry->d_inode)
2381                 claim = NFS4_OPEN_CLAIM_FH;
2382         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2383                         label, claim, GFP_KERNEL);
2384         if (opendata == NULL)
2385                 goto err_put_state_owner;
2386
2387         if (label) {
2388                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2389                 if (IS_ERR(olabel)) {
2390                         status = PTR_ERR(olabel);
2391                         goto err_opendata_put;
2392                 }
2393         }
2394
2395         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2396                 if (!opendata->f_attr.mdsthreshold) {
2397                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2398                         if (!opendata->f_attr.mdsthreshold)
2399                                 goto err_free_label;
2400                 }
2401                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2402         }
2403         if (dentry->d_inode != NULL)
2404                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2405
2406         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2407         if (status != 0)
2408                 goto err_free_label;
2409         state = ctx->state;
2410
2411         if ((opendata->o_arg.open_flags & O_EXCL) &&
2412             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2413                 nfs4_exclusive_attrset(opendata, sattr);
2414
2415                 nfs_fattr_init(opendata->o_res.f_attr);
2416                 status = nfs4_do_setattr(state->inode, cred,
2417                                 opendata->o_res.f_attr, sattr,
2418                                 state, label, olabel);
2419                 if (status == 0) {
2420                         nfs_setattr_update_inode(state->inode, sattr,
2421                                         opendata->o_res.f_attr);
2422                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2423                 }
2424         }
2425         if (opendata->file_created)
2426                 *opened |= FILE_CREATED;
2427
2428         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2429                 *ctx_th = opendata->f_attr.mdsthreshold;
2430                 opendata->f_attr.mdsthreshold = NULL;
2431         }
2432
2433         nfs4_label_free(olabel);
2434
2435         nfs4_opendata_put(opendata);
2436         nfs4_put_state_owner(sp);
2437         return 0;
2438 err_free_label:
2439         nfs4_label_free(olabel);
2440 err_opendata_put:
2441         nfs4_opendata_put(opendata);
2442 err_put_state_owner:
2443         nfs4_put_state_owner(sp);
2444 out_err:
2445         return status;
2446 }
2447
2448
2449 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2450                                         struct nfs_open_context *ctx,
2451                                         int flags,
2452                                         struct iattr *sattr,
2453                                         struct nfs4_label *label,
2454                                         int *opened)
2455 {
2456         struct nfs_server *server = NFS_SERVER(dir);
2457         struct nfs4_exception exception = { };
2458         struct nfs4_state *res;
2459         int status;
2460
2461         do {
2462                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2463                 res = ctx->state;
2464                 trace_nfs4_open_file(ctx, flags, status);
2465                 if (status == 0)
2466                         break;
2467                 /* NOTE: BAD_SEQID means the server and client disagree about the
2468                  * book-keeping w.r.t. state-changing operations
2469                  * (OPEN/CLOSE/LOCK/LOCKU...)
2470                  * It is actually a sign of a bug on the client or on the server.
2471                  *
2472                  * If we receive a BAD_SEQID error in the particular case of
2473                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2474                  * have unhashed the old state_owner for us, and that we can
2475                  * therefore safely retry using a new one. We should still warn
2476                  * the user though...
2477                  */
2478                 if (status == -NFS4ERR_BAD_SEQID) {
2479                         pr_warn_ratelimited("NFS: v4 server %s "
2480                                         " returned a bad sequence-id error!\n",
2481                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2482                         exception.retry = 1;
2483                         continue;
2484                 }
2485                 /*
2486                  * BAD_STATEID on OPEN means that the server cancelled our
2487                  * state before it received the OPEN_CONFIRM.
2488                  * Recover by retrying the request as per the discussion
2489                  * on Page 181 of RFC3530.
2490                  */
2491                 if (status == -NFS4ERR_BAD_STATEID) {
2492                         exception.retry = 1;
2493                         continue;
2494                 }
2495                 if (status == -EAGAIN) {
2496                         /* We must have found a delegation */
2497                         exception.retry = 1;
2498                         continue;
2499                 }
2500                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2501                         continue;
2502                 res = ERR_PTR(nfs4_handle_exception(server,
2503                                         status, &exception));
2504         } while (exception.retry);
2505         return res;
2506 }
2507
2508 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2509                             struct nfs_fattr *fattr, struct iattr *sattr,
2510                             struct nfs4_state *state, struct nfs4_label *ilabel,
2511                             struct nfs4_label *olabel)
2512 {
2513         struct nfs_server *server = NFS_SERVER(inode);
2514         struct nfs_setattrargs  arg = {
2515                 .fh             = NFS_FH(inode),
2516                 .iap            = sattr,
2517                 .server         = server,
2518                 .bitmask = server->attr_bitmask,
2519                 .label          = ilabel,
2520         };
2521         struct nfs_setattrres  res = {
2522                 .fattr          = fattr,
2523                 .label          = olabel,
2524                 .server         = server,
2525         };
2526         struct rpc_message msg = {
2527                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2528                 .rpc_argp       = &arg,
2529                 .rpc_resp       = &res,
2530                 .rpc_cred       = cred,
2531         };
2532         unsigned long timestamp = jiffies;
2533         fmode_t fmode;
2534         bool truncate;
2535         int status;
2536
2537         arg.bitmask = nfs4_bitmask(server, ilabel);
2538         if (ilabel)
2539                 arg.bitmask = nfs4_bitmask(server, olabel);
2540
2541         nfs_fattr_init(fattr);
2542
2543         /* Servers should only apply open mode checks for file size changes */
2544         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2545         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2546
2547         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2548                 /* Use that stateid */
2549         } else if (truncate && state != NULL) {
2550                 struct nfs_lockowner lockowner = {
2551                         .l_owner = current->files,
2552                         .l_pid = current->tgid,
2553                 };
2554                 if (!nfs4_valid_open_stateid(state))
2555                         return -EBADF;
2556                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2557                                 &lockowner) == -EIO)
2558                         return -EBADF;
2559         } else
2560                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2561
2562         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2563         if (status == 0 && state != NULL)
2564                 renew_lease(server, timestamp);
2565         return status;
2566 }
2567
2568 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2569                            struct nfs_fattr *fattr, struct iattr *sattr,
2570                            struct nfs4_state *state, struct nfs4_label *ilabel,
2571                            struct nfs4_label *olabel)
2572 {
2573         struct nfs_server *server = NFS_SERVER(inode);
2574         struct nfs4_exception exception = {
2575                 .state = state,
2576                 .inode = inode,
2577         };
2578         int err;
2579         do {
2580                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2581                 trace_nfs4_setattr(inode, err);
2582                 switch (err) {
2583                 case -NFS4ERR_OPENMODE:
2584                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2585                                 pr_warn_once("NFSv4: server %s is incorrectly "
2586                                                 "applying open mode checks to "
2587                                                 "a SETATTR that is not "
2588                                                 "changing file size.\n",
2589                                                 server->nfs_client->cl_hostname);
2590                         }
2591                         if (state && !(state->state & FMODE_WRITE)) {
2592                                 err = -EBADF;
2593                                 if (sattr->ia_valid & ATTR_OPEN)
2594                                         err = -EACCES;
2595                                 goto out;
2596                         }
2597                 }
2598                 err = nfs4_handle_exception(server, err, &exception);
2599         } while (exception.retry);
2600 out:
2601         return err;
2602 }
2603
2604 struct nfs4_closedata {
2605         struct inode *inode;
2606         struct nfs4_state *state;
2607         struct nfs_closeargs arg;
2608         struct nfs_closeres res;
2609         struct nfs_fattr fattr;
2610         unsigned long timestamp;
2611         bool roc;
2612         u32 roc_barrier;
2613 };
2614
2615 static void nfs4_free_closedata(void *data)
2616 {
2617         struct nfs4_closedata *calldata = data;
2618         struct nfs4_state_owner *sp = calldata->state->owner;
2619         struct super_block *sb = calldata->state->inode->i_sb;
2620
2621         if (calldata->roc)
2622                 pnfs_roc_release(calldata->state->inode);
2623         nfs4_put_open_state(calldata->state);
2624         nfs_free_seqid(calldata->arg.seqid);
2625         nfs4_put_state_owner(sp);
2626         nfs_sb_deactive(sb);
2627         kfree(calldata);
2628 }
2629
2630 static void nfs4_close_done(struct rpc_task *task, void *data)
2631 {
2632         struct nfs4_closedata *calldata = data;
2633         struct nfs4_state *state = calldata->state;
2634         struct nfs_server *server = NFS_SERVER(calldata->inode);
2635         nfs4_stateid *res_stateid = NULL;
2636
2637         dprintk("%s: begin!\n", __func__);
2638         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2639                 return;
2640         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2641         /* hmm. we are done with the inode, and in the process of freeing
2642          * the state_owner. we keep this around to process errors
2643          */
2644         switch (task->tk_status) {
2645                 case 0:
2646                         res_stateid = &calldata->res.stateid;
2647                         if (calldata->arg.fmode == 0 && calldata->roc)
2648                                 pnfs_roc_set_barrier(state->inode,
2649                                                      calldata->roc_barrier);
2650                         renew_lease(server, calldata->timestamp);
2651                         break;
2652                 case -NFS4ERR_ADMIN_REVOKED:
2653                 case -NFS4ERR_STALE_STATEID:
2654                 case -NFS4ERR_OLD_STATEID:
2655                 case -NFS4ERR_BAD_STATEID:
2656                 case -NFS4ERR_EXPIRED:
2657                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2658                                                 &state->open_stateid)) {
2659                                 rpc_restart_call_prepare(task);
2660                                 goto out_release;
2661                         }
2662                         if (calldata->arg.fmode == 0)
2663                                 break;
2664                 default:
2665                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2666                                 rpc_restart_call_prepare(task);
2667                                 goto out_release;
2668                         }
2669         }
2670         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2671 out_release:
2672         nfs_release_seqid(calldata->arg.seqid);
2673         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2674         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2675 }
2676
2677 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2678 {
2679         struct nfs4_closedata *calldata = data;
2680         struct nfs4_state *state = calldata->state;
2681         struct inode *inode = calldata->inode;
2682         bool is_rdonly, is_wronly, is_rdwr;
2683         int call_close = 0;
2684
2685         dprintk("%s: begin!\n", __func__);
2686         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2687                 goto out_wait;
2688
2689         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2690         spin_lock(&state->owner->so_lock);
2691         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2692         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2693         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2694         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2695         /* Calculate the change in open mode */
2696         calldata->arg.fmode = 0;
2697         if (state->n_rdwr == 0) {
2698                 if (state->n_rdonly == 0)
2699                         call_close |= is_rdonly;
2700                 else if (is_rdonly)
2701                         calldata->arg.fmode |= FMODE_READ;
2702                 if (state->n_wronly == 0)
2703                         call_close |= is_wronly;
2704                 else if (is_wronly)
2705                         calldata->arg.fmode |= FMODE_WRITE;
2706         } else if (is_rdwr)
2707                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2708
2709         if (calldata->arg.fmode == 0)
2710                 call_close |= is_rdwr;
2711
2712         if (!nfs4_valid_open_stateid(state))
2713                 call_close = 0;
2714         spin_unlock(&state->owner->so_lock);
2715
2716         if (!call_close) {
2717                 /* Note: exit _without_ calling nfs4_close_done */
2718                 goto out_no_action;
2719         }
2720
2721         if (calldata->arg.fmode == 0) {
2722                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2723                 if (calldata->roc &&
2724                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2725                         nfs_release_seqid(calldata->arg.seqid);
2726                         goto out_wait;
2727                     }
2728         }
2729         calldata->arg.share_access =
2730                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2731                                 calldata->arg.fmode, 0);
2732
2733         nfs_fattr_init(calldata->res.fattr);
2734         calldata->timestamp = jiffies;
2735         if (nfs4_setup_sequence(NFS_SERVER(inode),
2736                                 &calldata->arg.seq_args,
2737                                 &calldata->res.seq_res,
2738                                 task) != 0)
2739                 nfs_release_seqid(calldata->arg.seqid);
2740         dprintk("%s: done!\n", __func__);
2741         return;
2742 out_no_action:
2743         task->tk_action = NULL;
2744 out_wait:
2745         nfs4_sequence_done(task, &calldata->res.seq_res);
2746 }
2747
2748 static const struct rpc_call_ops nfs4_close_ops = {
2749         .rpc_call_prepare = nfs4_close_prepare,
2750         .rpc_call_done = nfs4_close_done,
2751         .rpc_release = nfs4_free_closedata,
2752 };
2753
2754 static bool nfs4_roc(struct inode *inode)
2755 {
2756         if (!nfs_have_layout(inode))
2757                 return false;
2758         return pnfs_roc(inode);
2759 }
2760
2761 /*
2762  * It is possible for data to be read/written from a mem-mapped file
2763  * after the sys_close call (which hits the vfs layer as a flush).
2764  * This means that we can't safely call nfsv4 close on a file until
2765  * the inode is cleared. This in turn means that we are not good
2766  * NFSv4 citizens - we do not indicate to the server to update the file's
2767  * share state even when we are done with one of the three share
2768  * stateid's in the inode.
2769  *
2770  * NOTE: Caller must be holding the sp->so_owner semaphore!
2771  */
2772 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2773 {
2774         struct nfs_server *server = NFS_SERVER(state->inode);
2775         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2776         struct nfs4_closedata *calldata;
2777         struct nfs4_state_owner *sp = state->owner;
2778         struct rpc_task *task;
2779         struct rpc_message msg = {
2780                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2781                 .rpc_cred = state->owner->so_cred,
2782         };
2783         struct rpc_task_setup task_setup_data = {
2784                 .rpc_client = server->client,
2785                 .rpc_message = &msg,
2786                 .callback_ops = &nfs4_close_ops,
2787                 .workqueue = nfsiod_workqueue,
2788                 .flags = RPC_TASK_ASYNC,
2789         };
2790         int status = -ENOMEM;
2791
2792         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2793                 &task_setup_data.rpc_client, &msg);
2794
2795         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2796         if (calldata == NULL)
2797                 goto out;
2798         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2799         calldata->inode = state->inode;
2800         calldata->state = state;
2801         calldata->arg.fh = NFS_FH(state->inode);
2802         /* Serialization for the sequence id */
2803         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2804         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2805         if (IS_ERR(calldata->arg.seqid))
2806                 goto out_free_calldata;
2807         calldata->arg.fmode = 0;
2808         calldata->arg.bitmask = server->cache_consistency_bitmask;
2809         calldata->res.fattr = &calldata->fattr;
2810         calldata->res.seqid = calldata->arg.seqid;
2811         calldata->res.server = server;
2812         calldata->roc = nfs4_roc(state->inode);
2813         nfs_sb_active(calldata->inode->i_sb);
2814
2815         msg.rpc_argp = &calldata->arg;
2816         msg.rpc_resp = &calldata->res;
2817         task_setup_data.callback_data = calldata;
2818         task = rpc_run_task(&task_setup_data);
2819         if (IS_ERR(task))
2820                 return PTR_ERR(task);
2821         status = 0;
2822         if (wait)
2823                 status = rpc_wait_for_completion_task(task);
2824         rpc_put_task(task);
2825         return status;
2826 out_free_calldata:
2827         kfree(calldata);
2828 out:
2829         nfs4_put_open_state(state);
2830         nfs4_put_state_owner(sp);
2831         return status;
2832 }
2833
2834 static struct inode *
2835 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2836                 int open_flags, struct iattr *attr, int *opened)
2837 {
2838         struct nfs4_state *state;
2839         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2840
2841         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2842
2843         /* Protect against concurrent sillydeletes */
2844         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2845
2846         nfs4_label_release_security(label);
2847
2848         if (IS_ERR(state))
2849                 return ERR_CAST(state);
2850         return state->inode;
2851 }
2852
2853 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2854 {
2855         if (ctx->state == NULL)
2856                 return;
2857         if (is_sync)
2858                 nfs4_close_sync(ctx->state, ctx->mode);
2859         else
2860                 nfs4_close_state(ctx->state, ctx->mode);
2861 }
2862
2863 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2864 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2865 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2866
2867 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2868 {
2869         struct nfs4_server_caps_arg args = {
2870                 .fhandle = fhandle,
2871         };
2872         struct nfs4_server_caps_res res = {};
2873         struct rpc_message msg = {
2874                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2875                 .rpc_argp = &args,
2876                 .rpc_resp = &res,
2877         };
2878         int status;
2879
2880         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2881         if (status == 0) {
2882                 /* Sanity check the server answers */
2883                 switch (server->nfs_client->cl_minorversion) {
2884                 case 0:
2885                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2886                         res.attr_bitmask[2] = 0;
2887                         break;
2888                 case 1:
2889                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2890                         break;
2891                 case 2:
2892                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2893                 }
2894                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2895                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2896                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2897                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2898                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2899                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2900                                 NFS_CAP_SECURITY_LABEL);
2901                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2902                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2903                         server->caps |= NFS_CAP_ACLS;
2904                 if (res.has_links != 0)
2905                         server->caps |= NFS_CAP_HARDLINKS;
2906                 if (res.has_symlinks != 0)
2907                         server->caps |= NFS_CAP_SYMLINKS;
2908                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2909                         server->caps |= NFS_CAP_FILEID;
2910                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2911                         server->caps |= NFS_CAP_MODE;
2912                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2913                         server->caps |= NFS_CAP_NLINK;
2914                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2915                         server->caps |= NFS_CAP_OWNER;
2916                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2917                         server->caps |= NFS_CAP_OWNER_GROUP;
2918                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2919                         server->caps |= NFS_CAP_ATIME;
2920                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2921                         server->caps |= NFS_CAP_CTIME;
2922                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2923                         server->caps |= NFS_CAP_MTIME;
2924 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2925                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2926                         server->caps |= NFS_CAP_SECURITY_LABEL;
2927 #endif
2928                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2929                                 sizeof(server->attr_bitmask));
2930                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2931
2932                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2933                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2934                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2935                 server->cache_consistency_bitmask[2] = 0;
2936                 server->acl_bitmask = res.acl_bitmask;
2937                 server->fh_expire_type = res.fh_expire_type;
2938         }
2939
2940         return status;
2941 }
2942
2943 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2944 {
2945         struct nfs4_exception exception = { };
2946         int err;
2947         do {
2948                 err = nfs4_handle_exception(server,
2949                                 _nfs4_server_capabilities(server, fhandle),
2950                                 &exception);
2951         } while (exception.retry);
2952         return err;
2953 }
2954
2955 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2956                 struct nfs_fsinfo *info)
2957 {
2958         u32 bitmask[3];
2959         struct nfs4_lookup_root_arg args = {
2960                 .bitmask = bitmask,
2961         };
2962         struct nfs4_lookup_res res = {
2963                 .server = server,
2964                 .fattr = info->fattr,
2965                 .fh = fhandle,
2966         };
2967         struct rpc_message msg = {
2968                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2969                 .rpc_argp = &args,
2970                 .rpc_resp = &res,
2971         };
2972
2973         bitmask[0] = nfs4_fattr_bitmap[0];
2974         bitmask[1] = nfs4_fattr_bitmap[1];
2975         /*
2976          * Process the label in the upcoming getfattr
2977          */
2978         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2979
2980         nfs_fattr_init(info->fattr);
2981         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2982 }
2983
2984 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2985                 struct nfs_fsinfo *info)
2986 {
2987         struct nfs4_exception exception = { };
2988         int err;
2989         do {
2990                 err = _nfs4_lookup_root(server, fhandle, info);
2991                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2992                 switch (err) {
2993                 case 0:
2994                 case -NFS4ERR_WRONGSEC:
2995                         goto out;
2996                 default:
2997                         err = nfs4_handle_exception(server, err, &exception);
2998                 }
2999         } while (exception.retry);
3000 out:
3001         return err;
3002 }
3003
3004 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3005                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3006 {
3007         struct rpc_auth_create_args auth_args = {
3008                 .pseudoflavor = flavor,
3009         };
3010         struct rpc_auth *auth;
3011         int ret;
3012
3013         auth = rpcauth_create(&auth_args, server->client);
3014         if (IS_ERR(auth)) {
3015                 ret = -EACCES;
3016                 goto out;
3017         }
3018         ret = nfs4_lookup_root(server, fhandle, info);
3019 out:
3020         return ret;
3021 }
3022
3023 /*
3024  * Retry pseudoroot lookup with various security flavors.  We do this when:
3025  *
3026  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3027  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3028  *
3029  * Returns zero on success, or a negative NFS4ERR value, or a
3030  * negative errno value.
3031  */
3032 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3033                               struct nfs_fsinfo *info)
3034 {
3035         /* Per 3530bis 15.33.5 */
3036         static const rpc_authflavor_t flav_array[] = {
3037                 RPC_AUTH_GSS_KRB5P,
3038                 RPC_AUTH_GSS_KRB5I,
3039                 RPC_AUTH_GSS_KRB5,
3040                 RPC_AUTH_UNIX,                  /* courtesy */
3041                 RPC_AUTH_NULL,
3042         };
3043         int status = -EPERM;
3044         size_t i;
3045
3046         if (server->auth_info.flavor_len > 0) {
3047                 /* try each flavor specified by user */
3048                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3049                         status = nfs4_lookup_root_sec(server, fhandle, info,
3050                                                 server->auth_info.flavors[i]);
3051                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3052                                 continue;
3053                         break;
3054                 }
3055         } else {
3056                 /* no flavors specified by user, try default list */
3057                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3058                         status = nfs4_lookup_root_sec(server, fhandle, info,
3059                                                       flav_array[i]);
3060                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3061                                 continue;
3062                         break;
3063                 }
3064         }
3065
3066         /*
3067          * -EACCESS could mean that the user doesn't have correct permissions
3068          * to access the mount.  It could also mean that we tried to mount
3069          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3070          * existing mount programs don't handle -EACCES very well so it should
3071          * be mapped to -EPERM instead.
3072          */
3073         if (status == -EACCES)
3074                 status = -EPERM;
3075         return status;
3076 }
3077
3078 static int nfs4_do_find_root_sec(struct nfs_server *server,
3079                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3080 {
3081         int mv = server->nfs_client->cl_minorversion;
3082         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3083 }
3084
3085 /**
3086  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3087  * @server: initialized nfs_server handle
3088  * @fhandle: we fill in the pseudo-fs root file handle
3089  * @info: we fill in an FSINFO struct
3090  * @auth_probe: probe the auth flavours
3091  *
3092  * Returns zero on success, or a negative errno.
3093  */
3094 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3095                          struct nfs_fsinfo *info,
3096                          bool auth_probe)
3097 {
3098         int status;
3099
3100         switch (auth_probe) {
3101         case false:
3102                 status = nfs4_lookup_root(server, fhandle, info);
3103                 if (status != -NFS4ERR_WRONGSEC)
3104                         break;
3105         default:
3106                 status = nfs4_do_find_root_sec(server, fhandle, info);
3107         }
3108
3109         if (status == 0)
3110                 status = nfs4_server_capabilities(server, fhandle);
3111         if (status == 0)
3112                 status = nfs4_do_fsinfo(server, fhandle, info);
3113
3114         return nfs4_map_errors(status);
3115 }
3116
3117 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3118                               struct nfs_fsinfo *info)
3119 {
3120         int error;
3121         struct nfs_fattr *fattr = info->fattr;
3122         struct nfs4_label *label = NULL;
3123
3124         error = nfs4_server_capabilities(server, mntfh);
3125         if (error < 0) {
3126                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3127                 return error;
3128         }
3129
3130         label = nfs4_label_alloc(server, GFP_KERNEL);
3131         if (IS_ERR(label))
3132                 return PTR_ERR(label);
3133
3134         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3135         if (error < 0) {
3136                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3137                 goto err_free_label;
3138         }
3139
3140         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3141             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3142                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3143
3144 err_free_label:
3145         nfs4_label_free(label);
3146
3147         return error;
3148 }
3149
3150 /*
3151  * Get locations and (maybe) other attributes of a referral.
3152  * Note that we'll actually follow the referral later when
3153  * we detect fsid mismatch in inode revalidation
3154  */
3155 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3156                              const struct qstr *name, struct nfs_fattr *fattr,
3157                              struct nfs_fh *fhandle)
3158 {
3159         int status = -ENOMEM;
3160         struct page *page = NULL;
3161         struct nfs4_fs_locations *locations = NULL;
3162
3163         page = alloc_page(GFP_KERNEL);
3164         if (page == NULL)
3165                 goto out;
3166         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3167         if (locations == NULL)
3168                 goto out;
3169
3170         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3171         if (status != 0)
3172                 goto out;
3173
3174         /*
3175          * If the fsid didn't change, this is a migration event, not a
3176          * referral.  Cause us to drop into the exception handler, which
3177          * will kick off migration recovery.
3178          */
3179         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3180                 dprintk("%s: server did not return a different fsid for"
3181                         " a referral at %s\n", __func__, name->name);
3182                 status = -NFS4ERR_MOVED;
3183                 goto out;
3184         }
3185         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3186         nfs_fixup_referral_attributes(&locations->fattr);
3187
3188         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3189         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3190         memset(fhandle, 0, sizeof(struct nfs_fh));
3191 out:
3192         if (page)
3193                 __free_page(page);
3194         kfree(locations);
3195         return status;
3196 }
3197
3198 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3199                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3200 {
3201         struct nfs4_getattr_arg args = {
3202                 .fh = fhandle,
3203                 .bitmask = server->attr_bitmask,
3204         };
3205         struct nfs4_getattr_res res = {
3206                 .fattr = fattr,
3207                 .label = label,
3208                 .server = server,
3209         };
3210         struct rpc_message msg = {
3211                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3212                 .rpc_argp = &args,
3213                 .rpc_resp = &res,
3214         };
3215
3216         args.bitmask = nfs4_bitmask(server, label);
3217
3218         nfs_fattr_init(fattr);
3219         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3220 }
3221
3222 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3223                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3224 {
3225         struct nfs4_exception exception = { };
3226         int err;
3227         do {
3228                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3229                 trace_nfs4_getattr(server, fhandle, fattr, err);
3230                 err = nfs4_handle_exception(server, err,
3231                                 &exception);
3232         } while (exception.retry);
3233         return err;
3234 }
3235
3236 /*
3237  * The file is not closed if it is opened due to the a request to change
3238  * the size of the file. The open call will not be needed once the
3239  * VFS layer lookup-intents are implemented.
3240  *
3241  * Close is called when the inode is destroyed.
3242  * If we haven't opened the file for O_WRONLY, we
3243  * need to in the size_change case to obtain a stateid.
3244  *
3245  * Got race?
3246  * Because OPEN is always done by name in nfsv4, it is
3247  * possible that we opened a different file by the same
3248  * name.  We can recognize this race condition, but we
3249  * can't do anything about it besides returning an error.
3250  *
3251  * This will be fixed with VFS changes (lookup-intent).
3252  */
3253 static int
3254 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3255                   struct iattr *sattr)
3256 {
3257         struct inode *inode = dentry->d_inode;
3258         struct rpc_cred *cred = NULL;
3259         struct nfs4_state *state = NULL;
3260         struct nfs4_label *label = NULL;
3261         int status;
3262
3263         if (pnfs_ld_layoutret_on_setattr(inode) &&
3264             sattr->ia_valid & ATTR_SIZE &&
3265             sattr->ia_size < i_size_read(inode))
3266                 pnfs_commit_and_return_layout(inode);
3267
3268         nfs_fattr_init(fattr);
3269
3270         /* Deal with open(O_TRUNC) */
3271         if (sattr->ia_valid & ATTR_OPEN)
3272                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3273
3274         /* Optimization: if the end result is no change, don't RPC */
3275         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3276                 return 0;
3277
3278         /* Search for an existing open(O_WRITE) file */
3279         if (sattr->ia_valid & ATTR_FILE) {
3280                 struct nfs_open_context *ctx;
3281
3282                 ctx = nfs_file_open_context(sattr->ia_file);
3283                 if (ctx) {
3284                         cred = ctx->cred;
3285                         state = ctx->state;
3286                 }
3287         }
3288
3289         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3290         if (IS_ERR(label))
3291                 return PTR_ERR(label);
3292
3293         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3294         if (status == 0) {
3295                 nfs_setattr_update_inode(inode, sattr, fattr);
3296                 nfs_setsecurity(inode, fattr, label);
3297         }
3298         nfs4_label_free(label);
3299         return status;
3300 }
3301
3302 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3303                 const struct qstr *name, struct nfs_fh *fhandle,
3304                 struct nfs_fattr *fattr, struct nfs4_label *label)
3305 {
3306         struct nfs_server *server = NFS_SERVER(dir);
3307         int                    status;
3308         struct nfs4_lookup_arg args = {
3309                 .bitmask = server->attr_bitmask,
3310                 .dir_fh = NFS_FH(dir),
3311                 .name = name,
3312         };
3313         struct nfs4_lookup_res res = {
3314                 .server = server,
3315                 .fattr = fattr,
3316                 .label = label,
3317                 .fh = fhandle,
3318         };
3319         struct rpc_message msg = {
3320                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3321                 .rpc_argp = &args,
3322                 .rpc_resp = &res,
3323         };
3324
3325         args.bitmask = nfs4_bitmask(server, label);
3326
3327         nfs_fattr_init(fattr);
3328
3329         dprintk("NFS call  lookup %s\n", name->name);
3330         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3331         dprintk("NFS reply lookup: %d\n", status);
3332         return status;
3333 }
3334
3335 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3336 {
3337         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3338                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3339         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3340         fattr->nlink = 2;
3341 }
3342
3343 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3344                                    struct qstr *name, struct nfs_fh *fhandle,
3345                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3346 {
3347         struct nfs4_exception exception = { };
3348         struct rpc_clnt *client = *clnt;
3349         int err;
3350         do {
3351                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3352                 trace_nfs4_lookup(dir, name, err);
3353                 switch (err) {
3354                 case -NFS4ERR_BADNAME:
3355                         err = -ENOENT;
3356                         goto out;
3357                 case -NFS4ERR_MOVED:
3358                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3359                         goto out;
3360                 case -NFS4ERR_WRONGSEC:
3361                         err = -EPERM;
3362                         if (client != *clnt)
3363                                 goto out;
3364                         client = nfs4_negotiate_security(client, dir, name);
3365                         if (IS_ERR(client))
3366                                 return PTR_ERR(client);
3367
3368                         exception.retry = 1;
3369                         break;
3370                 default:
3371                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3372                 }
3373         } while (exception.retry);
3374
3375 out:
3376         if (err == 0)
3377                 *clnt = client;
3378         else if (client != *clnt)
3379                 rpc_shutdown_client(client);
3380
3381         return err;
3382 }
3383
3384 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3385                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3386                             struct nfs4_label *label)
3387 {
3388         int status;
3389         struct rpc_clnt *client = NFS_CLIENT(dir);
3390
3391         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3392         if (client != NFS_CLIENT(dir)) {
3393                 rpc_shutdown_client(client);
3394                 nfs_fixup_secinfo_attributes(fattr);
3395         }
3396         return status;
3397 }
3398
3399 struct rpc_clnt *
3400 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3401                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3402 {
3403         struct rpc_clnt *client = NFS_CLIENT(dir);
3404         int status;
3405
3406         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3407         if (status < 0)
3408                 return ERR_PTR(status);
3409         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3410 }
3411
3412 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3413 {
3414         struct nfs_server *server = NFS_SERVER(inode);
3415         struct nfs4_accessargs args = {
3416                 .fh = NFS_FH(inode),
3417                 .bitmask = server->cache_consistency_bitmask,
3418         };
3419         struct nfs4_accessres res = {
3420                 .server = server,
3421         };
3422         struct rpc_message msg = {
3423                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3424                 .rpc_argp = &args,
3425                 .rpc_resp = &res,
3426                 .rpc_cred = entry->cred,
3427         };
3428         int mode = entry->mask;
3429         int status = 0;
3430
3431         /*
3432          * Determine which access bits we want to ask for...
3433          */
3434         if (mode & MAY_READ)
3435                 args.access |= NFS4_ACCESS_READ;
3436         if (S_ISDIR(inode->i_mode)) {
3437                 if (mode & MAY_WRITE)
3438                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3439                 if (mode & MAY_EXEC)
3440                         args.access |= NFS4_ACCESS_LOOKUP;
3441         } else {
3442                 if (mode & MAY_WRITE)
3443                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3444                 if (mode & MAY_EXEC)
3445                         args.access |= NFS4_ACCESS_EXECUTE;
3446         }
3447
3448         res.fattr = nfs_alloc_fattr();
3449         if (res.fattr == NULL)
3450                 return -ENOMEM;
3451
3452         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3453         if (!status) {
3454                 nfs_access_set_mask(entry, res.access);
3455                 nfs_refresh_inode(inode, res.fattr);
3456         }
3457         nfs_free_fattr(res.fattr);
3458         return status;
3459 }
3460
3461 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3462 {
3463         struct nfs4_exception exception = { };
3464         int err;
3465         do {
3466                 err = _nfs4_proc_access(inode, entry);
3467                 trace_nfs4_access(inode, err);
3468                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3469                                 &exception);
3470         } while (exception.retry);
3471         return err;
3472 }
3473
3474 /*
3475  * TODO: For the time being, we don't try to get any attributes
3476  * along with any of the zero-copy operations READ, READDIR,
3477  * READLINK, WRITE.
3478  *
3479  * In the case of the first three, we want to put the GETATTR
3480  * after the read-type operation -- this is because it is hard
3481  * to predict the length of a GETATTR response in v4, and thus
3482  * align the READ data correctly.  This means that the GETATTR
3483  * may end up partially falling into the page cache, and we should
3484  * shift it into the 'tail' of the xdr_buf before processing.
3485  * To do this efficiently, we need to know the total length
3486  * of data received, which doesn't seem to be available outside
3487  * of the RPC layer.
3488  *
3489  * In the case of WRITE, we also want to put the GETATTR after
3490  * the operation -- in this case because we want to make sure
3491  * we get the post-operation mtime and size.
3492  *
3493  * Both of these changes to the XDR layer would in fact be quite
3494  * minor, but I decided to leave them for a subsequent patch.
3495  */
3496 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3497                 unsigned int pgbase, unsigned int pglen)
3498 {
3499         struct nfs4_readlink args = {
3500                 .fh       = NFS_FH(inode),
3501                 .pgbase   = pgbase,
3502                 .pglen    = pglen,
3503                 .pages    = &page,
3504         };
3505         struct nfs4_readlink_res res;
3506         struct rpc_message msg = {
3507                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3508                 .rpc_argp = &args,
3509                 .rpc_resp = &res,
3510         };
3511
3512         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3513 }
3514
3515 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3516                 unsigned int pgbase, unsigned int pglen)
3517 {
3518         struct nfs4_exception exception = { };
3519         int err;
3520         do {
3521                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3522                 trace_nfs4_readlink(inode, err);
3523                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3524                                 &exception);
3525         } while (exception.retry);
3526         return err;
3527 }
3528
3529 /*
3530  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3531  */
3532 static int
3533 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3534                  int flags)
3535 {
3536         struct nfs4_label l, *ilabel = NULL;
3537         struct nfs_open_context *ctx;
3538         struct nfs4_state *state;
3539         int opened = 0;
3540         int status = 0;
3541
3542         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3543         if (IS_ERR(ctx))
3544                 return PTR_ERR(ctx);
3545
3546         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3547
3548         sattr->ia_mode &= ~current_umask();
3549         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3550         if (IS_ERR(state)) {
3551                 status = PTR_ERR(state);
3552                 goto out;
3553         }
3554 out:
3555         nfs4_label_release_security(ilabel);
3556         put_nfs_open_context(ctx);
3557         return status;
3558 }
3559
3560 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3561 {
3562         struct nfs_server *server = NFS_SERVER(dir);
3563         struct nfs_removeargs args = {
3564                 .fh = NFS_FH(dir),
3565                 .name = *name,
3566         };
3567         struct nfs_removeres res = {
3568                 .server = server,
3569         };
3570         struct rpc_message msg = {
3571                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3572                 .rpc_argp = &args,
3573                 .rpc_resp = &res,
3574         };
3575         int status;
3576
3577         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3578         if (status == 0)
3579                 update_changeattr(dir, &res.cinfo);
3580         return status;
3581 }
3582
3583 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3584 {
3585         struct nfs4_exception exception = { };
3586         int err;
3587         do {
3588                 err = _nfs4_proc_remove(dir, name);
3589                 trace_nfs4_remove(dir, name, err);
3590                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3591                                 &exception);
3592         } while (exception.retry);
3593         return err;
3594 }
3595
3596 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3597 {
3598         struct nfs_server *server = NFS_SERVER(dir);
3599         struct nfs_removeargs *args = msg->rpc_argp;
3600         struct nfs_removeres *res = msg->rpc_resp;
3601
3602         res->server = server;
3603         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3604         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3605
3606         nfs_fattr_init(res->dir_attr);
3607 }
3608
3609 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3610 {
3611         nfs4_setup_sequence(NFS_SERVER(data->dir),
3612                         &data->args.seq_args,
3613                         &data->res.seq_res,
3614                         task);
3615 }
3616
3617 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3618 {
3619         struct nfs_unlinkdata *data = task->tk_calldata;
3620         struct nfs_removeres *res = &data->res;
3621
3622         if (!nfs4_sequence_done(task, &res->seq_res))
3623                 return 0;
3624         if (nfs4_async_handle_error(task, res->server, NULL,
3625                                     &data->timeout) == -EAGAIN)
3626                 return 0;
3627         update_changeattr(dir, &res->cinfo);
3628         return 1;
3629 }
3630
3631 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3632 {
3633         struct nfs_server *server = NFS_SERVER(dir);
3634         struct nfs_renameargs *arg = msg->rpc_argp;
3635         struct nfs_renameres *res = msg->rpc_resp;
3636
3637         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3638         res->server = server;
3639         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3640 }
3641
3642 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3643 {
3644         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3645                         &data->args.seq_args,
3646                         &data->res.seq_res,
3647                         task);
3648 }
3649
3650 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3651                                  struct inode *new_dir)
3652 {
3653         struct nfs_renamedata *data = task->tk_calldata;
3654         struct nfs_renameres *res = &data->res;
3655
3656         if (!nfs4_sequence_done(task, &res->seq_res))
3657                 return 0;
3658         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3659                 return 0;
3660
3661         update_changeattr(old_dir, &res->old_cinfo);
3662         update_changeattr(new_dir, &res->new_cinfo);
3663         return 1;
3664 }
3665
3666 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3667 {
3668         struct nfs_server *server = NFS_SERVER(inode);
3669         struct nfs4_link_arg arg = {
3670                 .fh     = NFS_FH(inode),
3671                 .dir_fh = NFS_FH(dir),
3672                 .name   = name,
3673                 .bitmask = server->attr_bitmask,
3674         };
3675         struct nfs4_link_res res = {
3676                 .server = server,
3677                 .label = NULL,
3678         };
3679         struct rpc_message msg = {
3680                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3681                 .rpc_argp = &arg,
3682                 .rpc_resp = &res,
3683         };
3684         int status = -ENOMEM;
3685
3686         res.fattr = nfs_alloc_fattr();
3687         if (res.fattr == NULL)
3688                 goto out;
3689
3690         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3691         if (IS_ERR(res.label)) {
3692                 status = PTR_ERR(res.label);
3693                 goto out;
3694         }
3695         arg.bitmask = nfs4_bitmask(server, res.label);
3696
3697         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3698         if (!status) {
3699                 update_changeattr(dir, &res.cinfo);
3700                 status = nfs_post_op_update_inode(inode, res.fattr);
3701                 if (!status)
3702                         nfs_setsecurity(inode, res.fattr, res.label);
3703         }
3704
3705
3706         nfs4_label_free(res.label);
3707
3708 out:
3709         nfs_free_fattr(res.fattr);
3710         return status;
3711 }
3712
3713 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3714 {
3715         struct nfs4_exception exception = { };
3716         int err;
3717         do {
3718                 err = nfs4_handle_exception(NFS_SERVER(inode),
3719                                 _nfs4_proc_link(inode, dir, name),
3720                                 &exception);
3721         } while (exception.retry);
3722         return err;
3723 }
3724
3725 struct nfs4_createdata {
3726         struct rpc_message msg;
3727         struct nfs4_create_arg arg;
3728         struct nfs4_create_res res;
3729         struct nfs_fh fh;
3730         struct nfs_fattr fattr;
3731         struct nfs4_label *label;
3732 };
3733
3734 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3735                 struct qstr *name, struct iattr *sattr, u32 ftype)
3736 {
3737         struct nfs4_createdata *data;
3738
3739         data = kzalloc(sizeof(*data), GFP_KERNEL);
3740         if (data != NULL) {
3741                 struct nfs_server *server = NFS_SERVER(dir);
3742
3743                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3744                 if (IS_ERR(data->label))
3745                         goto out_free;
3746
3747                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3748                 data->msg.rpc_argp = &data->arg;
3749                 data->msg.rpc_resp = &data->res;
3750                 data->arg.dir_fh = NFS_FH(dir);
3751                 data->arg.server = server;
3752                 data->arg.name = name;
3753                 data->arg.attrs = sattr;
3754                 data->arg.ftype = ftype;
3755                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3756                 data->res.server = server;
3757                 data->res.fh = &data->fh;
3758                 data->res.fattr = &data->fattr;
3759                 data->res.label = data->label;
3760                 nfs_fattr_init(data->res.fattr);
3761         }
3762         return data;
3763 out_free:
3764         kfree(data);
3765         return NULL;
3766 }
3767
3768 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3769 {
3770         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3771                                     &data->arg.seq_args, &data->res.seq_res, 1);
3772         if (status == 0) {
3773                 update_changeattr(dir, &data->res.dir_cinfo);
3774                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3775         }
3776         return status;
3777 }
3778
3779 static void nfs4_free_createdata(struct nfs4_createdata *data)
3780 {
3781         nfs4_label_free(data->label);
3782         kfree(data);
3783 }
3784
3785 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3786                 struct page *page, unsigned int len, struct iattr *sattr,
3787                 struct nfs4_label *label)
3788 {
3789         struct nfs4_createdata *data;
3790         int status = -ENAMETOOLONG;
3791
3792         if (len > NFS4_MAXPATHLEN)
3793                 goto out;
3794
3795         status = -ENOMEM;
3796         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3797         if (data == NULL)
3798                 goto out;
3799
3800         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3801         data->arg.u.symlink.pages = &page;
3802         data->arg.u.symlink.len = len;
3803         data->arg.label = label;
3804
3805         status = nfs4_do_create(dir, dentry, data);
3806
3807         nfs4_free_createdata(data);
3808 out:
3809         return status;
3810 }
3811
3812 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3813                 struct page *page, unsigned int len, struct iattr *sattr)
3814 {
3815         struct nfs4_exception exception = { };
3816         struct nfs4_label l, *label = NULL;
3817         int err;
3818
3819         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3820
3821         do {
3822                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3823                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3824                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3825                                 &exception);
3826         } while (exception.retry);
3827
3828         nfs4_label_release_security(label);
3829         return err;
3830 }
3831
3832 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3833                 struct iattr *sattr, struct nfs4_label *label)
3834 {
3835         struct nfs4_createdata *data;
3836         int status = -ENOMEM;
3837
3838         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3839         if (data == NULL)
3840                 goto out;
3841
3842         data->arg.label = label;
3843         status = nfs4_do_create(dir, dentry, data);
3844
3845         nfs4_free_createdata(data);
3846 out:
3847         return status;
3848 }
3849
3850 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3851                 struct iattr *sattr)
3852 {
3853         struct nfs4_exception exception = { };
3854         struct nfs4_label l, *label = NULL;
3855         int err;
3856
3857         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3858
3859         sattr->ia_mode &= ~current_umask();
3860         do {
3861                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3862                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3863                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3864                                 &exception);
3865         } while (exception.retry);
3866         nfs4_label_release_security(label);
3867
3868         return err;
3869 }
3870
3871 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3872                 u64 cookie, struct page **pages, unsigned int count, int plus)
3873 {
3874         struct inode            *dir = dentry->d_inode;
3875         struct nfs4_readdir_arg args = {
3876                 .fh = NFS_FH(dir),
3877                 .pages = pages,
3878                 .pgbase = 0,
3879                 .count = count,
3880                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3881                 .plus = plus,
3882         };
3883         struct nfs4_readdir_res res;
3884         struct rpc_message msg = {
3885                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3886                 .rpc_argp = &args,
3887                 .rpc_resp = &res,
3888                 .rpc_cred = cred,
3889         };
3890         int                     status;
3891
3892         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3893                         dentry,
3894                         (unsigned long long)cookie);
3895         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3896         res.pgbase = args.pgbase;
3897         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3898         if (status >= 0) {
3899                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3900                 status += args.pgbase;
3901         }
3902
3903         nfs_invalidate_atime(dir);
3904
3905         dprintk("%s: returns %d\n", __func__, status);
3906         return status;
3907 }
3908
3909 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3910                 u64 cookie, struct page **pages, unsigned int count, int plus)
3911 {
3912         struct nfs4_exception exception = { };
3913         int err;
3914         do {
3915                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3916                                 pages, count, plus);
3917                 trace_nfs4_readdir(dentry->d_inode, err);
3918                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3919                                 &exception);
3920         } while (exception.retry);
3921         return err;
3922 }
3923
3924 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3925                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3926 {
3927         struct nfs4_createdata *data;
3928         int mode = sattr->ia_mode;
3929         int status = -ENOMEM;
3930
3931         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3932         if (data == NULL)
3933                 goto out;
3934
3935         if (S_ISFIFO(mode))
3936                 data->arg.ftype = NF4FIFO;
3937         else if (S_ISBLK(mode)) {
3938                 data->arg.ftype = NF4BLK;
3939                 data->arg.u.device.specdata1 = MAJOR(rdev);
3940                 data->arg.u.device.specdata2 = MINOR(rdev);
3941         }
3942         else if (S_ISCHR(mode)) {
3943                 data->arg.ftype = NF4CHR;
3944                 data->arg.u.device.specdata1 = MAJOR(rdev);
3945                 data->arg.u.device.specdata2 = MINOR(rdev);
3946         } else if (!S_ISSOCK(mode)) {
3947                 status = -EINVAL;
3948                 goto out_free;
3949         }
3950
3951         data->arg.label = label;
3952         status = nfs4_do_create(dir, dentry, data);
3953 out_free:
3954         nfs4_free_createdata(data);
3955 out:
3956         return status;
3957 }
3958
3959 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3960                 struct iattr *sattr, dev_t rdev)
3961 {
3962         struct nfs4_exception exception = { };
3963         struct nfs4_label l, *label = NULL;
3964         int err;
3965
3966         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3967
3968         sattr->ia_mode &= ~current_umask();
3969         do {
3970                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3971                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3972                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3973                                 &exception);
3974         } while (exception.retry);
3975
3976         nfs4_label_release_security(label);
3977
3978         return err;
3979 }
3980
3981 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3982                  struct nfs_fsstat *fsstat)
3983 {
3984         struct nfs4_statfs_arg args = {
3985                 .fh = fhandle,
3986                 .bitmask = server->attr_bitmask,
3987         };
3988         struct nfs4_statfs_res res = {
3989                 .fsstat = fsstat,
3990         };
3991         struct rpc_message msg = {
3992                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3993                 .rpc_argp = &args,
3994                 .rpc_resp = &res,
3995         };
3996
3997         nfs_fattr_init(fsstat->fattr);
3998         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3999 }
4000
4001 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4002 {
4003         struct nfs4_exception exception = { };
4004         int err;
4005         do {
4006                 err = nfs4_handle_exception(server,
4007                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4008                                 &exception);
4009         } while (exception.retry);
4010         return err;
4011 }
4012
4013 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4014                 struct nfs_fsinfo *fsinfo)
4015 {
4016         struct nfs4_fsinfo_arg args = {
4017                 .fh = fhandle,
4018                 .bitmask = server->attr_bitmask,
4019         };
4020         struct nfs4_fsinfo_res res = {
4021                 .fsinfo = fsinfo,
4022         };
4023         struct rpc_message msg = {
4024                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4025                 .rpc_argp = &args,
4026                 .rpc_resp = &res,
4027         };
4028
4029         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4030 }
4031
4032 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4033 {
4034         struct nfs4_exception exception = { };
4035         unsigned long now = jiffies;
4036         int err;
4037
4038         do {
4039                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4040                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4041                 if (err == 0) {
4042                         struct nfs_client *clp = server->nfs_client;
4043
4044                         spin_lock(&clp->cl_lock);
4045                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4046                         clp->cl_last_renewal = now;
4047                         spin_unlock(&clp->cl_lock);
4048                         break;
4049                 }
4050                 err = nfs4_handle_exception(server, err, &exception);
4051         } while (exception.retry);
4052         return err;
4053 }
4054
4055 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4056 {
4057         int error;
4058
4059         nfs_fattr_init(fsinfo->fattr);
4060         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4061         if (error == 0) {
4062                 /* block layout checks this! */
4063                 server->pnfs_blksize = fsinfo->blksize;
4064                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4065         }
4066
4067         return error;
4068 }
4069
4070 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4071                 struct nfs_pathconf *pathconf)
4072 {
4073         struct nfs4_pathconf_arg args = {
4074                 .fh = fhandle,
4075                 .bitmask = server->attr_bitmask,
4076         };
4077         struct nfs4_pathconf_res res = {
4078                 .pathconf = pathconf,
4079         };
4080         struct rpc_message msg = {
4081                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4082                 .rpc_argp = &args,
4083                 .rpc_resp = &res,
4084         };
4085
4086         /* None of the pathconf attributes are mandatory to implement */
4087         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4088                 memset(pathconf, 0, sizeof(*pathconf));
4089                 return 0;
4090         }
4091
4092         nfs_fattr_init(pathconf->fattr);
4093         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4094 }
4095
4096 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4097                 struct nfs_pathconf *pathconf)
4098 {
4099         struct nfs4_exception exception = { };
4100         int err;
4101
4102         do {
4103                 err = nfs4_handle_exception(server,
4104                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4105                                 &exception);
4106         } while (exception.retry);
4107         return err;
4108 }
4109
4110 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4111                 const struct nfs_open_context *ctx,
4112                 const struct nfs_lock_context *l_ctx,
4113                 fmode_t fmode)
4114 {
4115         const struct nfs_lockowner *lockowner = NULL;
4116
4117         if (l_ctx != NULL)
4118                 lockowner = &l_ctx->lockowner;
4119         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4120 }
4121 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4122
4123 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4124                 const struct nfs_open_context *ctx,
4125                 const struct nfs_lock_context *l_ctx,
4126                 fmode_t fmode)
4127 {
4128         nfs4_stateid current_stateid;
4129
4130         /* If the current stateid represents a lost lock, then exit */
4131         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4132                 return true;
4133         return nfs4_stateid_match(stateid, &current_stateid);
4134 }
4135
4136 static bool nfs4_error_stateid_expired(int err)
4137 {
4138         switch (err) {
4139         case -NFS4ERR_DELEG_REVOKED:
4140         case -NFS4ERR_ADMIN_REVOKED:
4141         case -NFS4ERR_BAD_STATEID:
4142         case -NFS4ERR_STALE_STATEID:
4143         case -NFS4ERR_OLD_STATEID:
4144         case -NFS4ERR_OPENMODE:
4145         case -NFS4ERR_EXPIRED:
4146                 return true;
4147         }
4148         return false;
4149 }
4150
4151 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4152 {
4153         nfs_invalidate_atime(hdr->inode);
4154 }
4155
4156 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4157 {
4158         struct nfs_server *server = NFS_SERVER(hdr->inode);
4159
4160         trace_nfs4_read(hdr, task->tk_status);
4161         if (nfs4_async_handle_error(task, server,
4162                                     hdr->args.context->state,
4163                                     NULL) == -EAGAIN) {
4164                 rpc_restart_call_prepare(task);
4165                 return -EAGAIN;
4166         }
4167
4168         __nfs4_read_done_cb(hdr);
4169         if (task->tk_status > 0)
4170                 renew_lease(server, hdr->timestamp);
4171         return 0;
4172 }
4173
4174 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4175                 struct nfs_pgio_args *args)
4176 {
4177
4178         if (!nfs4_error_stateid_expired(task->tk_status) ||
4179                 nfs4_stateid_is_current(&args->stateid,
4180                                 args->context,
4181                                 args->lock_context,
4182                                 FMODE_READ))
4183                 return false;
4184         rpc_restart_call_prepare(task);
4185         return true;
4186 }
4187
4188 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4189 {
4190
4191         dprintk("--> %s\n", __func__);
4192
4193         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4194                 return -EAGAIN;
4195         if (nfs4_read_stateid_changed(task, &hdr->args))
4196                 return -EAGAIN;
4197         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4198                                     nfs4_read_done_cb(task, hdr);
4199 }
4200
4201 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4202                                  struct rpc_message *msg)
4203 {
4204         hdr->timestamp   = jiffies;
4205         hdr->pgio_done_cb = nfs4_read_done_cb;
4206         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4207         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4208 }
4209
4210 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4211                                       struct nfs_pgio_header *hdr)
4212 {
4213         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4214                         &hdr->args.seq_args,
4215                         &hdr->res.seq_res,
4216                         task))
4217                 return 0;
4218         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4219                                 hdr->args.lock_context,
4220                                 hdr->rw_ops->rw_mode) == -EIO)
4221                 return -EIO;
4222         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4223                 return -EIO;
4224         return 0;
4225 }
4226
4227 static int nfs4_write_done_cb(struct rpc_task *task,
4228                               struct nfs_pgio_header *hdr)
4229 {
4230         struct inode *inode = hdr->inode;
4231
4232         trace_nfs4_write(hdr, task->tk_status);
4233         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4234                                     hdr->args.context->state,
4235                                     NULL) == -EAGAIN) {
4236                 rpc_restart_call_prepare(task);
4237                 return -EAGAIN;
4238         }
4239         if (task->tk_status >= 0) {
4240                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4241                 nfs_writeback_update_inode(hdr);
4242         }
4243         return 0;
4244 }
4245
4246 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4247                 struct nfs_pgio_args *args)
4248 {
4249
4250         if (!nfs4_error_stateid_expired(task->tk_status) ||
4251                 nfs4_stateid_is_current(&args->stateid,
4252                                 args->context,
4253                                 args->lock_context,
4254                                 FMODE_WRITE))
4255                 return false;
4256         rpc_restart_call_prepare(task);
4257         return true;
4258 }
4259
4260 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4261 {
4262         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4263                 return -EAGAIN;
4264         if (nfs4_write_stateid_changed(task, &hdr->args))
4265                 return -EAGAIN;
4266         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4267                 nfs4_write_done_cb(task, hdr);
4268 }
4269
4270 static
4271 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4272 {
4273         /* Don't request attributes for pNFS or O_DIRECT writes */
4274         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4275                 return false;
4276         /* Otherwise, request attributes if and only if we don't hold
4277          * a delegation
4278          */
4279         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4280 }
4281
4282 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4283                                   struct rpc_message *msg)
4284 {
4285         struct nfs_server *server = NFS_SERVER(hdr->inode);
4286
4287         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4288                 hdr->args.bitmask = NULL;
4289                 hdr->res.fattr = NULL;
4290         } else
4291                 hdr->args.bitmask = server->cache_consistency_bitmask;
4292
4293         if (!hdr->pgio_done_cb)
4294                 hdr->pgio_done_cb = nfs4_write_done_cb;
4295         hdr->res.server = server;
4296         hdr->timestamp   = jiffies;
4297
4298         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4299         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4300 }
4301
4302 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4303 {
4304         nfs4_setup_sequence(NFS_SERVER(data->inode),
4305                         &data->args.seq_args,
4306                         &data->res.seq_res,
4307                         task);
4308 }
4309
4310 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4311 {
4312         struct inode *inode = data->inode;
4313
4314         trace_nfs4_commit(data, task->tk_status);
4315         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4316                                     NULL, NULL) == -EAGAIN) {
4317                 rpc_restart_call_prepare(task);
4318                 return -EAGAIN;
4319         }
4320         return 0;
4321 }
4322
4323 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4324 {
4325         if (!nfs4_sequence_done(task, &data->res.seq_res))
4326                 return -EAGAIN;
4327         return data->commit_done_cb(task, data);
4328 }
4329
4330 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4331 {
4332         struct nfs_server *server = NFS_SERVER(data->inode);
4333
4334         if (data->commit_done_cb == NULL)
4335                 data->commit_done_cb = nfs4_commit_done_cb;
4336         data->res.server = server;
4337         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4338         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4339 }
4340
4341 struct nfs4_renewdata {
4342         struct nfs_client       *client;
4343         unsigned long           timestamp;
4344 };
4345
4346 /*
4347  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4348  * standalone procedure for queueing an asynchronous RENEW.
4349  */
4350 static void nfs4_renew_release(void *calldata)
4351 {
4352         struct nfs4_renewdata *data = calldata;
4353         struct nfs_client *clp = data->client;
4354
4355         if (atomic_read(&clp->cl_count) > 1)
4356                 nfs4_schedule_state_renewal(clp);
4357         nfs_put_client(clp);
4358         kfree(data);
4359 }
4360
4361 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4362 {
4363         struct nfs4_renewdata *data = calldata;
4364         struct nfs_client *clp = data->client;
4365         unsigned long timestamp = data->timestamp;
4366
4367         trace_nfs4_renew_async(clp, task->tk_status);
4368         switch (task->tk_status) {
4369         case 0:
4370                 break;
4371         case -NFS4ERR_LEASE_MOVED:
4372                 nfs4_schedule_lease_moved_recovery(clp);
4373                 break;
4374         default:
4375                 /* Unless we're shutting down, schedule state recovery! */
4376                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4377                         return;
4378                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4379                         nfs4_schedule_lease_recovery(clp);
4380                         return;
4381                 }
4382                 nfs4_schedule_path_down_recovery(clp);
4383         }
4384         do_renew_lease(clp, timestamp);
4385 }
4386
4387 static const struct rpc_call_ops nfs4_renew_ops = {
4388         .rpc_call_done = nfs4_renew_done,
4389         .rpc_release = nfs4_renew_release,
4390 };
4391
4392 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4393 {
4394         struct rpc_message msg = {
4395                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4396                 .rpc_argp       = clp,
4397                 .rpc_cred       = cred,
4398         };
4399         struct nfs4_renewdata *data;
4400
4401         if (renew_flags == 0)
4402                 return 0;
4403         if (!atomic_inc_not_zero(&clp->cl_count))
4404                 return -EIO;
4405         data = kmalloc(sizeof(*data), GFP_NOFS);
4406         if (data == NULL)
4407                 return -ENOMEM;
4408         data->client = clp;
4409         data->timestamp = jiffies;
4410         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4411                         &nfs4_renew_ops, data);
4412 }
4413
4414 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4415 {
4416         struct rpc_message msg = {
4417                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4418                 .rpc_argp       = clp,
4419                 .rpc_cred       = cred,
4420         };
4421         unsigned long now = jiffies;
4422         int status;
4423
4424         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4425         if (status < 0)
4426                 return status;
4427         do_renew_lease(clp, now);
4428         return 0;
4429 }
4430
4431 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4432 {
4433         return server->caps & NFS_CAP_ACLS;
4434 }
4435
4436 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4437  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4438  * the stack.
4439  */
4440 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4441
4442 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4443                 struct page **pages, unsigned int *pgbase)
4444 {
4445         struct page *newpage, **spages;
4446         int rc = 0;
4447         size_t len;
4448         spages = pages;
4449
4450         do {
4451                 len = min_t(size_t, PAGE_SIZE, buflen);
4452                 newpage = alloc_page(GFP_KERNEL);
4453
4454                 if (newpage == NULL)
4455                         goto unwind;
4456                 memcpy(page_address(newpage), buf, len);
4457                 buf += len;
4458                 buflen -= len;
4459                 *pages++ = newpage;
4460                 rc++;
4461         } while (buflen != 0);
4462
4463         return rc;
4464
4465 unwind:
4466         for(; rc > 0; rc--)
4467                 __free_page(spages[rc-1]);
4468         return -ENOMEM;
4469 }
4470
4471 struct nfs4_cached_acl {
4472         int cached;
4473         size_t len;
4474         char data[0];
4475 };
4476
4477 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4478 {
4479         struct nfs_inode *nfsi = NFS_I(inode);
4480
4481         spin_lock(&inode->i_lock);
4482         kfree(nfsi->nfs4_acl);
4483         nfsi->nfs4_acl = acl;
4484         spin_unlock(&inode->i_lock);
4485 }
4486
4487 static void nfs4_zap_acl_attr(struct inode *inode)
4488 {
4489         nfs4_set_cached_acl(inode, NULL);
4490 }
4491
4492 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4493 {
4494         struct nfs_inode *nfsi = NFS_I(inode);
4495         struct nfs4_cached_acl *acl;
4496         int ret = -ENOENT;
4497
4498         spin_lock(&inode->i_lock);
4499         acl = nfsi->nfs4_acl;
4500         if (acl == NULL)
4501                 goto out;
4502         if (buf == NULL) /* user is just asking for length */
4503                 goto out_len;
4504         if (acl->cached == 0)
4505                 goto out;
4506         ret = -ERANGE; /* see getxattr(2) man page */
4507         if (acl->len > buflen)
4508                 goto out;
4509         memcpy(buf, acl->data, acl->len);
4510 out_len:
4511         ret = acl->len;
4512 out:
4513         spin_unlock(&inode->i_lock);
4514         return ret;
4515 }
4516
4517 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4518 {
4519         struct nfs4_cached_acl *acl;
4520         size_t buflen = sizeof(*acl) + acl_len;
4521
4522         if (buflen <= PAGE_SIZE) {
4523                 acl = kmalloc(buflen, GFP_KERNEL);
4524                 if (acl == NULL)
4525                         goto out;
4526                 acl->cached = 1;
4527                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4528         } else {
4529                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4530                 if (acl == NULL)
4531                         goto out;
4532                 acl->cached = 0;
4533         }
4534         acl->len = acl_len;
4535 out:
4536         nfs4_set_cached_acl(inode, acl);
4537 }
4538
4539 /*
4540  * The getxattr API returns the required buffer length when called with a
4541  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4542  * the required buf.  On a NULL buf, we send a page of data to the server
4543  * guessing that the ACL request can be serviced by a page. If so, we cache
4544  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4545  * the cache. If not so, we throw away the page, and cache the required
4546  * length. The next getxattr call will then produce another round trip to
4547  * the server, this time with the input buf of the required size.
4548  */
4549 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4550 {
4551         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4552         struct nfs_getaclargs args = {
4553                 .fh = NFS_FH(inode),
4554                 .acl_pages = pages,
4555                 .acl_len = buflen,
4556         };
4557         struct nfs_getaclres res = {
4558                 .acl_len = buflen,
4559         };
4560         struct rpc_message msg = {
4561                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4562                 .rpc_argp = &args,
4563                 .rpc_resp = &res,
4564         };
4565         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4566         int ret = -ENOMEM, i;
4567
4568         /* As long as we're doing a round trip to the server anyway,
4569          * let's be prepared for a page of acl data. */
4570         if (npages == 0)
4571                 npages = 1;
4572         if (npages > ARRAY_SIZE(pages))
4573                 return -ERANGE;
4574
4575         for (i = 0; i < npages; i++) {
4576                 pages[i] = alloc_page(GFP_KERNEL);
4577                 if (!pages[i])
4578                         goto out_free;
4579         }
4580
4581         /* for decoding across pages */
4582         res.acl_scratch = alloc_page(GFP_KERNEL);
4583         if (!res.acl_scratch)
4584                 goto out_free;
4585
4586         args.acl_len = npages * PAGE_SIZE;
4587         args.acl_pgbase = 0;
4588
4589         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4590                 __func__, buf, buflen, npages, args.acl_len);
4591         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4592                              &msg, &args.seq_args, &res.seq_res, 0);
4593         if (ret)
4594                 goto out_free;
4595
4596         /* Handle the case where the passed-in buffer is too short */
4597         if (res.acl_flags & NFS4_ACL_TRUNC) {
4598                 /* Did the user only issue a request for the acl length? */
4599                 if (buf == NULL)
4600                         goto out_ok;
4601                 ret = -ERANGE;
4602                 goto out_free;
4603         }
4604         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4605         if (buf) {
4606                 if (res.acl_len > buflen) {
4607                         ret = -ERANGE;
4608                         goto out_free;
4609                 }
4610                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4611         }
4612 out_ok:
4613         ret = res.acl_len;
4614 out_free:
4615         for (i = 0; i < npages; i++)
4616                 if (pages[i])
4617                         __free_page(pages[i]);
4618         if (res.acl_scratch)
4619                 __free_page(res.acl_scratch);
4620         return ret;
4621 }
4622
4623 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4624 {
4625         struct nfs4_exception exception = { };
4626         ssize_t ret;
4627         do {
4628                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4629                 trace_nfs4_get_acl(inode, ret);
4630                 if (ret >= 0)
4631                         break;
4632                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4633         } while (exception.retry);
4634         return ret;
4635 }
4636
4637 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4638 {
4639         struct nfs_server *server = NFS_SERVER(inode);
4640         int ret;
4641
4642         if (!nfs4_server_supports_acls(server))
4643                 return -EOPNOTSUPP;
4644         ret = nfs_revalidate_inode(server, inode);
4645         if (ret < 0)
4646                 return ret;
4647         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4648                 nfs_zap_acl_cache(inode);
4649         ret = nfs4_read_cached_acl(inode, buf, buflen);
4650         if (ret != -ENOENT)
4651                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4652                  * but no cached acl data, just the acl length */
4653                 return ret;
4654         return nfs4_get_acl_uncached(inode, buf, buflen);
4655 }
4656
4657 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4658 {
4659         struct nfs_server *server = NFS_SERVER(inode);
4660         struct page *pages[NFS4ACL_MAXPAGES];
4661         struct nfs_setaclargs arg = {
4662                 .fh             = NFS_FH(inode),
4663                 .acl_pages      = pages,
4664                 .acl_len        = buflen,
4665         };
4666         struct nfs_setaclres res;
4667         struct rpc_message msg = {
4668                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4669                 .rpc_argp       = &arg,
4670                 .rpc_resp       = &res,
4671         };
4672         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4673         int ret, i;
4674
4675         if (!nfs4_server_supports_acls(server))
4676                 return -EOPNOTSUPP;
4677         if (npages > ARRAY_SIZE(pages))
4678                 return -ERANGE;
4679         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4680         if (i < 0)
4681                 return i;
4682         nfs4_inode_return_delegation(inode);
4683         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4684
4685         /*
4686          * Free each page after tx, so the only ref left is
4687          * held by the network stack
4688          */
4689         for (; i > 0; i--)
4690                 put_page(pages[i-1]);
4691
4692         /*
4693          * Acl update can result in inode attribute update.
4694          * so mark the attribute cache invalid.
4695          */
4696         spin_lock(&inode->i_lock);
4697         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4698         spin_unlock(&inode->i_lock);
4699         nfs_access_zap_cache(inode);
4700         nfs_zap_acl_cache(inode);
4701         return ret;
4702 }
4703
4704 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4705 {
4706         struct nfs4_exception exception = { };
4707         int err;
4708         do {
4709                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4710                 trace_nfs4_set_acl(inode, err);
4711                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4712                                 &exception);
4713         } while (exception.retry);
4714         return err;
4715 }
4716
4717 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4718 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4719                                         size_t buflen)
4720 {
4721         struct nfs_server *server = NFS_SERVER(inode);
4722         struct nfs_fattr fattr;
4723         struct nfs4_label label = {0, 0, buflen, buf};
4724
4725         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4726         struct nfs4_getattr_arg arg = {
4727                 .fh             = NFS_FH(inode),
4728                 .bitmask        = bitmask,
4729         };
4730         struct nfs4_getattr_res res = {
4731                 .fattr          = &fattr,
4732                 .label          = &label,
4733                 .server         = server,
4734         };
4735         struct rpc_message msg = {
4736                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4737                 .rpc_argp       = &arg,
4738                 .rpc_resp       = &res,
4739         };
4740         int ret;
4741
4742         nfs_fattr_init(&fattr);
4743
4744         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4745         if (ret)
4746                 return ret;
4747         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4748                 return -ENOENT;
4749         if (buflen < label.len)
4750                 return -ERANGE;
4751         return 0;
4752 }
4753
4754 static int nfs4_get_security_label(struct inode *inode, void *buf,
4755                                         size_t buflen)
4756 {
4757         struct nfs4_exception exception = { };
4758         int err;
4759
4760         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4761                 return -EOPNOTSUPP;
4762
4763         do {
4764                 err = _nfs4_get_security_label(inode, buf, buflen);
4765                 trace_nfs4_get_security_label(inode, err);
4766                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4767                                 &exception);
4768         } while (exception.retry);
4769         return err;
4770 }
4771
4772 static int _nfs4_do_set_security_label(struct inode *inode,
4773                 struct nfs4_label *ilabel,
4774                 struct nfs_fattr *fattr,
4775                 struct nfs4_label *olabel)
4776 {
4777
4778         struct iattr sattr = {0};
4779         struct nfs_server *server = NFS_SERVER(inode);
4780         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4781         struct nfs_setattrargs arg = {
4782                 .fh             = NFS_FH(inode),
4783                 .iap            = &sattr,
4784                 .server         = server,
4785                 .bitmask        = bitmask,
4786                 .label          = ilabel,
4787         };
4788         struct nfs_setattrres res = {
4789                 .fattr          = fattr,
4790                 .label          = olabel,
4791                 .server         = server,
4792         };
4793         struct rpc_message msg = {
4794                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4795                 .rpc_argp       = &arg,
4796                 .rpc_resp       = &res,
4797         };
4798         int status;
4799
4800         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4801
4802         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4803         if (status)
4804                 dprintk("%s failed: %d\n", __func__, status);
4805
4806         return status;
4807 }
4808
4809 static int nfs4_do_set_security_label(struct inode *inode,
4810                 struct nfs4_label *ilabel,
4811                 struct nfs_fattr *fattr,
4812                 struct nfs4_label *olabel)
4813 {
4814         struct nfs4_exception exception = { };
4815         int err;
4816
4817         do {
4818                 err = _nfs4_do_set_security_label(inode, ilabel,
4819                                 fattr, olabel);
4820                 trace_nfs4_set_security_label(inode, err);
4821                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4822                                 &exception);
4823         } while (exception.retry);
4824         return err;
4825 }
4826
4827 static int
4828 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4829 {
4830         struct nfs4_label ilabel, *olabel = NULL;
4831         struct nfs_fattr fattr;
4832         struct rpc_cred *cred;
4833         struct inode *inode = dentry->d_inode;
4834         int status;
4835
4836         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4837                 return -EOPNOTSUPP;
4838
4839         nfs_fattr_init(&fattr);
4840
4841         ilabel.pi = 0;
4842         ilabel.lfs = 0;
4843         ilabel.label = (char *)buf;
4844         ilabel.len = buflen;
4845
4846         cred = rpc_lookup_cred();
4847         if (IS_ERR(cred))
4848                 return PTR_ERR(cred);
4849
4850         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4851         if (IS_ERR(olabel)) {
4852                 status = -PTR_ERR(olabel);
4853                 goto out;
4854         }
4855
4856         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4857         if (status == 0)
4858                 nfs_setsecurity(inode, &fattr, olabel);
4859
4860         nfs4_label_free(olabel);
4861 out:
4862         put_rpccred(cred);
4863         return status;
4864 }
4865 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4866
4867
4868 static int
4869 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4870                         struct nfs4_state *state, long *timeout)
4871 {
4872         struct nfs_client *clp = server->nfs_client;
4873
4874         if (task->tk_status >= 0)
4875                 return 0;
4876         switch(task->tk_status) {
4877                 case -NFS4ERR_DELEG_REVOKED:
4878                 case -NFS4ERR_ADMIN_REVOKED:
4879                 case -NFS4ERR_BAD_STATEID:
4880                 case -NFS4ERR_OPENMODE:
4881                         if (state == NULL)
4882                                 break;
4883                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4884                                 goto recovery_failed;
4885                         goto wait_on_recovery;
4886                 case -NFS4ERR_EXPIRED:
4887                         if (state != NULL) {
4888                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4889                                         goto recovery_failed;
4890                         }
4891                 case -NFS4ERR_STALE_STATEID:
4892                 case -NFS4ERR_STALE_CLIENTID:
4893                         nfs4_schedule_lease_recovery(clp);
4894                         goto wait_on_recovery;
4895                 case -NFS4ERR_MOVED:
4896                         if (nfs4_schedule_migration_recovery(server) < 0)
4897                                 goto recovery_failed;
4898                         goto wait_on_recovery;
4899                 case -NFS4ERR_LEASE_MOVED:
4900                         nfs4_schedule_lease_moved_recovery(clp);
4901                         goto wait_on_recovery;
4902 #if defined(CONFIG_NFS_V4_1)
4903                 case -NFS4ERR_BADSESSION:
4904                 case -NFS4ERR_BADSLOT:
4905                 case -NFS4ERR_BAD_HIGH_SLOT:
4906                 case -NFS4ERR_DEADSESSION:
4907                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4908                 case -NFS4ERR_SEQ_FALSE_RETRY:
4909                 case -NFS4ERR_SEQ_MISORDERED:
4910                         dprintk("%s ERROR %d, Reset session\n", __func__,
4911                                 task->tk_status);
4912                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4913                         goto wait_on_recovery;
4914 #endif /* CONFIG_NFS_V4_1 */
4915                 case -NFS4ERR_DELAY:
4916                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4917                         rpc_delay(task, nfs4_update_delay(timeout));
4918                         goto restart_call;
4919                 case -NFS4ERR_GRACE:
4920                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4921                 case -NFS4ERR_RETRY_UNCACHED_REP:
4922                 case -NFS4ERR_OLD_STATEID:
4923                         goto restart_call;
4924         }
4925         task->tk_status = nfs4_map_errors(task->tk_status);
4926         return 0;
4927 recovery_failed:
4928         task->tk_status = -EIO;
4929         return 0;
4930 wait_on_recovery:
4931         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4932         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4933                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4934         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4935                 goto recovery_failed;
4936 restart_call:
4937         task->tk_status = 0;
4938         return -EAGAIN;
4939 }
4940
4941 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4942                                     nfs4_verifier *bootverf)
4943 {
4944         __be32 verf[2];
4945
4946         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4947                 /* An impossible timestamp guarantees this value
4948                  * will never match a generated boot time. */
4949                 verf[0] = 0;
4950                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4951         } else {
4952                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4953                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4954                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4955         }
4956         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4957 }
4958
4959 static unsigned int
4960 nfs4_init_nonuniform_client_string(struct nfs_client *clp,
4961                                    char *buf, size_t len)
4962 {
4963         unsigned int result;
4964
4965         if (clp->cl_owner_id != NULL)
4966                 return strlcpy(buf, clp->cl_owner_id, len);
4967
4968         rcu_read_lock();
4969         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4970                                 clp->cl_ipaddr,
4971                                 rpc_peeraddr2str(clp->cl_rpcclient,
4972                                                         RPC_DISPLAY_ADDR),
4973                                 rpc_peeraddr2str(clp->cl_rpcclient,
4974                                                         RPC_DISPLAY_PROTO));
4975         rcu_read_unlock();
4976         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4977         return result;
4978 }
4979
4980 static unsigned int
4981 nfs4_init_uniform_client_string(struct nfs_client *clp,
4982                                 char *buf, size_t len)
4983 {
4984         const char *nodename = clp->cl_rpcclient->cl_nodename;
4985         unsigned int result;
4986
4987         if (clp->cl_owner_id != NULL)
4988                 return strlcpy(buf, clp->cl_owner_id, len);
4989
4990         if (nfs4_client_id_uniquifier[0] != '\0')
4991                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4992                                 clp->rpc_ops->version,
4993                                 clp->cl_minorversion,
4994                                 nfs4_client_id_uniquifier,
4995                                 nodename);
4996         else
4997                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s",
4998                                 clp->rpc_ops->version, clp->cl_minorversion,
4999                                 nodename);
5000         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
5001         return result;
5002 }
5003
5004 /*
5005  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5006  * services.  Advertise one based on the address family of the
5007  * clientaddr.
5008  */
5009 static unsigned int
5010 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5011 {
5012         if (strchr(clp->cl_ipaddr, ':') != NULL)
5013                 return scnprintf(buf, len, "tcp6");
5014         else
5015                 return scnprintf(buf, len, "tcp");
5016 }
5017
5018 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5019 {
5020         struct nfs4_setclientid *sc = calldata;
5021
5022         if (task->tk_status == 0)
5023                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5024 }
5025
5026 static const struct rpc_call_ops nfs4_setclientid_ops = {
5027         .rpc_call_done = nfs4_setclientid_done,
5028 };
5029
5030 /**
5031  * nfs4_proc_setclientid - Negotiate client ID
5032  * @clp: state data structure
5033  * @program: RPC program for NFSv4 callback service
5034  * @port: IP port number for NFS4 callback service
5035  * @cred: RPC credential to use for this call
5036  * @res: where to place the result
5037  *
5038  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5039  */
5040 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5041                 unsigned short port, struct rpc_cred *cred,
5042                 struct nfs4_setclientid_res *res)
5043 {
5044         nfs4_verifier sc_verifier;
5045         struct nfs4_setclientid setclientid = {
5046                 .sc_verifier = &sc_verifier,
5047                 .sc_prog = program,
5048                 .sc_cb_ident = clp->cl_cb_ident,
5049         };
5050         struct rpc_message msg = {
5051                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5052                 .rpc_argp = &setclientid,
5053                 .rpc_resp = res,
5054                 .rpc_cred = cred,
5055         };
5056         struct rpc_task *task;
5057         struct rpc_task_setup task_setup_data = {
5058                 .rpc_client = clp->cl_rpcclient,
5059                 .rpc_message = &msg,
5060                 .callback_ops = &nfs4_setclientid_ops,
5061                 .callback_data = &setclientid,
5062                 .flags = RPC_TASK_TIMEOUT,
5063         };
5064         int status;
5065
5066         /* nfs_client_id4 */
5067         nfs4_init_boot_verifier(clp, &sc_verifier);
5068         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5069                 setclientid.sc_name_len =
5070                                 nfs4_init_uniform_client_string(clp,
5071                                                 setclientid.sc_name,
5072                                                 sizeof(setclientid.sc_name));
5073         else
5074                 setclientid.sc_name_len =
5075                                 nfs4_init_nonuniform_client_string(clp,
5076                                                 setclientid.sc_name,
5077                                                 sizeof(setclientid.sc_name));
5078         /* cb_client4 */
5079         setclientid.sc_netid_len =
5080                                 nfs4_init_callback_netid(clp,
5081                                                 setclientid.sc_netid,
5082                                                 sizeof(setclientid.sc_netid));
5083         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5084                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5085                                 clp->cl_ipaddr, port >> 8, port & 255);
5086
5087         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5088                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5089                 setclientid.sc_name_len, setclientid.sc_name);
5090         task = rpc_run_task(&task_setup_data);
5091         if (IS_ERR(task)) {
5092                 status = PTR_ERR(task);
5093                 goto out;
5094         }
5095         status = task->tk_status;
5096         if (setclientid.sc_cred) {
5097                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5098                 put_rpccred(setclientid.sc_cred);
5099         }
5100         rpc_put_task(task);
5101 out:
5102         trace_nfs4_setclientid(clp, status);
5103         dprintk("NFS reply setclientid: %d\n", status);
5104         return status;
5105 }
5106
5107 /**
5108  * nfs4_proc_setclientid_confirm - Confirm client ID
5109  * @clp: state data structure
5110  * @res: result of a previous SETCLIENTID
5111  * @cred: RPC credential to use for this call
5112  *
5113  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5114  */
5115 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5116                 struct nfs4_setclientid_res *arg,
5117                 struct rpc_cred *cred)
5118 {
5119         struct rpc_message msg = {
5120                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5121                 .rpc_argp = arg,
5122                 .rpc_cred = cred,
5123         };
5124         int status;
5125
5126         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5127                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5128                 clp->cl_clientid);
5129         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5130         trace_nfs4_setclientid_confirm(clp, status);
5131         dprintk("NFS reply setclientid_confirm: %d\n", status);
5132         return status;
5133 }
5134
5135 struct nfs4_delegreturndata {
5136         struct nfs4_delegreturnargs args;
5137         struct nfs4_delegreturnres res;
5138         struct nfs_fh fh;
5139         nfs4_stateid stateid;
5140         unsigned long timestamp;
5141         struct nfs_fattr fattr;
5142         int rpc_status;
5143         struct inode *inode;
5144         bool roc;
5145         u32 roc_barrier;
5146 };
5147
5148 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5149 {
5150         struct nfs4_delegreturndata *data = calldata;
5151
5152         if (!nfs4_sequence_done(task, &data->res.seq_res))
5153                 return;
5154
5155         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5156         switch (task->tk_status) {
5157         case 0:
5158                 renew_lease(data->res.server, data->timestamp);
5159         case -NFS4ERR_ADMIN_REVOKED:
5160         case -NFS4ERR_DELEG_REVOKED:
5161         case -NFS4ERR_BAD_STATEID:
5162         case -NFS4ERR_OLD_STATEID:
5163         case -NFS4ERR_STALE_STATEID:
5164         case -NFS4ERR_EXPIRED:
5165                 task->tk_status = 0;
5166                 if (data->roc)
5167                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5168                 break;
5169         default:
5170                 if (nfs4_async_handle_error(task, data->res.server,
5171                                             NULL, NULL) == -EAGAIN) {
5172                         rpc_restart_call_prepare(task);
5173                         return;
5174                 }
5175         }
5176         data->rpc_status = task->tk_status;
5177 }
5178
5179 static void nfs4_delegreturn_release(void *calldata)
5180 {
5181         struct nfs4_delegreturndata *data = calldata;
5182         struct inode *inode = data->inode;
5183
5184         if (inode) {
5185                 if (data->roc)
5186                         pnfs_roc_release(inode);
5187                 nfs_iput_and_deactive(inode);
5188         }
5189         kfree(calldata);
5190 }
5191
5192 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5193 {
5194         struct nfs4_delegreturndata *d_data;
5195
5196         d_data = (struct nfs4_delegreturndata *)data;
5197
5198         if (d_data->roc &&
5199             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5200                 return;
5201
5202         nfs4_setup_sequence(d_data->res.server,
5203                         &d_data->args.seq_args,
5204                         &d_data->res.seq_res,
5205                         task);
5206 }
5207
5208 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5209         .rpc_call_prepare = nfs4_delegreturn_prepare,
5210         .rpc_call_done = nfs4_delegreturn_done,
5211         .rpc_release = nfs4_delegreturn_release,
5212 };
5213
5214 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5215 {
5216         struct nfs4_delegreturndata *data;
5217         struct nfs_server *server = NFS_SERVER(inode);
5218         struct rpc_task *task;
5219         struct rpc_message msg = {
5220                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5221                 .rpc_cred = cred,
5222         };
5223         struct rpc_task_setup task_setup_data = {
5224                 .rpc_client = server->client,
5225                 .rpc_message = &msg,
5226                 .callback_ops = &nfs4_delegreturn_ops,
5227                 .flags = RPC_TASK_ASYNC,
5228         };
5229         int status = 0;
5230
5231         data = kzalloc(sizeof(*data), GFP_NOFS);
5232         if (data == NULL)
5233                 return -ENOMEM;
5234         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5235         data->args.fhandle = &data->fh;
5236         data->args.stateid = &data->stateid;
5237         data->args.bitmask = server->cache_consistency_bitmask;
5238         nfs_copy_fh(&data->fh, NFS_FH(inode));
5239         nfs4_stateid_copy(&data->stateid, stateid);
5240         data->res.fattr = &data->fattr;
5241         data->res.server = server;
5242         nfs_fattr_init(data->res.fattr);
5243         data->timestamp = jiffies;
5244         data->rpc_status = 0;
5245         data->inode = nfs_igrab_and_active(inode);
5246         if (data->inode)
5247                 data->roc = nfs4_roc(inode);
5248
5249         task_setup_data.callback_data = data;
5250         msg.rpc_argp = &data->args;
5251         msg.rpc_resp = &data->res;
5252         task = rpc_run_task(&task_setup_data);
5253         if (IS_ERR(task))
5254                 return PTR_ERR(task);
5255         if (!issync)
5256                 goto out;
5257         status = nfs4_wait_for_completion_rpc_task(task);
5258         if (status != 0)
5259                 goto out;
5260         status = data->rpc_status;
5261         if (status == 0)
5262                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5263         else
5264                 nfs_refresh_inode(inode, &data->fattr);
5265 out:
5266         rpc_put_task(task);
5267         return status;
5268 }
5269
5270 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5271 {
5272         struct nfs_server *server = NFS_SERVER(inode);
5273         struct nfs4_exception exception = { };
5274         int err;
5275         do {
5276                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5277                 trace_nfs4_delegreturn(inode, err);
5278                 switch (err) {
5279                         case -NFS4ERR_STALE_STATEID:
5280                         case -NFS4ERR_EXPIRED:
5281                         case 0:
5282                                 return 0;
5283                 }
5284                 err = nfs4_handle_exception(server, err, &exception);
5285         } while (exception.retry);
5286         return err;
5287 }
5288
5289 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5290 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5291
5292 /*
5293  * sleep, with exponential backoff, and retry the LOCK operation.
5294  */
5295 static unsigned long
5296 nfs4_set_lock_task_retry(unsigned long timeout)
5297 {
5298         freezable_schedule_timeout_killable_unsafe(timeout);
5299         timeout <<= 1;
5300         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5301                 return NFS4_LOCK_MAXTIMEOUT;
5302         return timeout;
5303 }
5304
5305 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5306 {
5307         struct inode *inode = state->inode;
5308         struct nfs_server *server = NFS_SERVER(inode);
5309         struct nfs_client *clp = server->nfs_client;
5310         struct nfs_lockt_args arg = {
5311                 .fh = NFS_FH(inode),
5312                 .fl = request,
5313         };
5314         struct nfs_lockt_res res = {
5315                 .denied = request,
5316         };
5317         struct rpc_message msg = {
5318                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5319                 .rpc_argp       = &arg,
5320                 .rpc_resp       = &res,
5321                 .rpc_cred       = state->owner->so_cred,
5322         };
5323         struct nfs4_lock_state *lsp;
5324         int status;
5325
5326         arg.lock_owner.clientid = clp->cl_clientid;
5327         status = nfs4_set_lock_state(state, request);
5328         if (status != 0)
5329                 goto out;
5330         lsp = request->fl_u.nfs4_fl.owner;
5331         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5332         arg.lock_owner.s_dev = server->s_dev;
5333         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5334         switch (status) {
5335                 case 0:
5336                         request->fl_type = F_UNLCK;
5337                         break;
5338                 case -NFS4ERR_DENIED:
5339                         status = 0;
5340         }
5341         request->fl_ops->fl_release_private(request);
5342         request->fl_ops = NULL;
5343 out:
5344         return status;
5345 }
5346
5347 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5348 {
5349         struct nfs4_exception exception = { };
5350         int err;
5351
5352         do {
5353                 err = _nfs4_proc_getlk(state, cmd, request);
5354                 trace_nfs4_get_lock(request, state, cmd, err);
5355                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5356                                 &exception);
5357         } while (exception.retry);
5358         return err;
5359 }
5360
5361 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5362 {
5363         int res = 0;
5364         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5365                 case FL_POSIX:
5366                         res = posix_lock_file_wait(file, fl);
5367                         break;
5368                 case FL_FLOCK:
5369                         res = flock_lock_file_wait(file, fl);
5370                         break;
5371                 default:
5372                         BUG();
5373         }
5374         return res;
5375 }
5376
5377 struct nfs4_unlockdata {
5378         struct nfs_locku_args arg;
5379         struct nfs_locku_res res;
5380         struct nfs4_lock_state *lsp;
5381         struct nfs_open_context *ctx;
5382         struct file_lock fl;
5383         const struct nfs_server *server;
5384         unsigned long timestamp;
5385 };
5386
5387 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5388                 struct nfs_open_context *ctx,
5389                 struct nfs4_lock_state *lsp,
5390                 struct nfs_seqid *seqid)
5391 {
5392         struct nfs4_unlockdata *p;
5393         struct inode *inode = lsp->ls_state->inode;
5394
5395         p = kzalloc(sizeof(*p), GFP_NOFS);
5396         if (p == NULL)
5397                 return NULL;
5398         p->arg.fh = NFS_FH(inode);
5399         p->arg.fl = &p->fl;
5400         p->arg.seqid = seqid;
5401         p->res.seqid = seqid;
5402         p->lsp = lsp;
5403         atomic_inc(&lsp->ls_count);
5404         /* Ensure we don't close file until we're done freeing locks! */
5405         p->ctx = get_nfs_open_context(ctx);
5406         memcpy(&p->fl, fl, sizeof(p->fl));
5407         p->server = NFS_SERVER(inode);
5408         return p;
5409 }
5410
5411 static void nfs4_locku_release_calldata(void *data)
5412 {
5413         struct nfs4_unlockdata *calldata = data;
5414         nfs_free_seqid(calldata->arg.seqid);
5415         nfs4_put_lock_state(calldata->lsp);
5416         put_nfs_open_context(calldata->ctx);
5417         kfree(calldata);
5418 }
5419
5420 static void nfs4_locku_done(struct rpc_task *task, void *data)
5421 {
5422         struct nfs4_unlockdata *calldata = data;
5423
5424         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5425                 return;
5426         switch (task->tk_status) {
5427                 case 0:
5428                         renew_lease(calldata->server, calldata->timestamp);
5429                         do_vfs_lock(calldata->fl.fl_file, &calldata->fl);
5430                         if (nfs4_update_lock_stateid(calldata->lsp,
5431                                         &calldata->res.stateid))
5432                                 break;
5433                 case -NFS4ERR_BAD_STATEID:
5434                 case -NFS4ERR_OLD_STATEID:
5435                 case -NFS4ERR_STALE_STATEID:
5436                 case -NFS4ERR_EXPIRED:
5437                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5438                                                 &calldata->lsp->ls_stateid))
5439                                 rpc_restart_call_prepare(task);
5440                         break;
5441                 default:
5442                         if (nfs4_async_handle_error(task, calldata->server,
5443                                                     NULL, NULL) == -EAGAIN)
5444                                 rpc_restart_call_prepare(task);
5445         }
5446         nfs_release_seqid(calldata->arg.seqid);
5447 }
5448
5449 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5450 {
5451         struct nfs4_unlockdata *calldata = data;
5452
5453         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5454                 goto out_wait;
5455         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5456         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5457                 /* Note: exit _without_ running nfs4_locku_done */
5458                 goto out_no_action;
5459         }
5460         calldata->timestamp = jiffies;
5461         if (nfs4_setup_sequence(calldata->server,
5462                                 &calldata->arg.seq_args,
5463                                 &calldata->res.seq_res,
5464                                 task) != 0)
5465                 nfs_release_seqid(calldata->arg.seqid);
5466         return;
5467 out_no_action:
5468         task->tk_action = NULL;
5469 out_wait:
5470         nfs4_sequence_done(task, &calldata->res.seq_res);
5471 }
5472
5473 static const struct rpc_call_ops nfs4_locku_ops = {
5474         .rpc_call_prepare = nfs4_locku_prepare,
5475         .rpc_call_done = nfs4_locku_done,
5476         .rpc_release = nfs4_locku_release_calldata,
5477 };
5478
5479 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5480                 struct nfs_open_context *ctx,
5481                 struct nfs4_lock_state *lsp,
5482                 struct nfs_seqid *seqid)
5483 {
5484         struct nfs4_unlockdata *data;
5485         struct rpc_message msg = {
5486                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5487                 .rpc_cred = ctx->cred,
5488         };
5489         struct rpc_task_setup task_setup_data = {
5490                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5491                 .rpc_message = &msg,
5492                 .callback_ops = &nfs4_locku_ops,
5493                 .workqueue = nfsiod_workqueue,
5494                 .flags = RPC_TASK_ASYNC,
5495         };
5496
5497         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5498                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5499
5500         /* Ensure this is an unlock - when canceling a lock, the
5501          * canceled lock is passed in, and it won't be an unlock.
5502          */
5503         fl->fl_type = F_UNLCK;
5504
5505         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5506         if (data == NULL) {
5507                 nfs_free_seqid(seqid);
5508                 return ERR_PTR(-ENOMEM);
5509         }
5510
5511         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5512         msg.rpc_argp = &data->arg;
5513         msg.rpc_resp = &data->res;
5514         task_setup_data.callback_data = data;
5515         return rpc_run_task(&task_setup_data);
5516 }
5517
5518 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5519 {
5520         struct inode *inode = state->inode;
5521         struct nfs4_state_owner *sp = state->owner;
5522         struct nfs_inode *nfsi = NFS_I(inode);
5523         struct nfs_seqid *seqid;
5524         struct nfs4_lock_state *lsp;
5525         struct rpc_task *task;
5526         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5527         int status = 0;
5528         unsigned char fl_flags = request->fl_flags;
5529
5530         status = nfs4_set_lock_state(state, request);
5531         /* Unlock _before_ we do the RPC call */
5532         request->fl_flags |= FL_EXISTS;
5533         /* Exclude nfs_delegation_claim_locks() */
5534         mutex_lock(&sp->so_delegreturn_mutex);
5535         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5536         down_read(&nfsi->rwsem);
5537         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5538                 up_read(&nfsi->rwsem);
5539                 mutex_unlock(&sp->so_delegreturn_mutex);
5540                 goto out;
5541         }
5542         up_read(&nfsi->rwsem);
5543         mutex_unlock(&sp->so_delegreturn_mutex);
5544         if (status != 0)
5545                 goto out;
5546         /* Is this a delegated lock? */
5547         lsp = request->fl_u.nfs4_fl.owner;
5548         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5549                 goto out;
5550         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5551         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5552         status = -ENOMEM;
5553         if (IS_ERR(seqid))
5554                 goto out;
5555         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5556         status = PTR_ERR(task);
5557         if (IS_ERR(task))
5558                 goto out;
5559         status = nfs4_wait_for_completion_rpc_task(task);
5560         rpc_put_task(task);
5561 out:
5562         request->fl_flags = fl_flags;
5563         trace_nfs4_unlock(request, state, F_SETLK, status);
5564         return status;
5565 }
5566
5567 struct nfs4_lockdata {
5568         struct nfs_lock_args arg;
5569         struct nfs_lock_res res;
5570         struct nfs4_lock_state *lsp;
5571         struct nfs_open_context *ctx;
5572         struct file_lock fl;
5573         unsigned long timestamp;
5574         int rpc_status;
5575         int cancelled;
5576         struct nfs_server *server;
5577 };
5578
5579 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5580                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5581                 gfp_t gfp_mask)
5582 {
5583         struct nfs4_lockdata *p;
5584         struct inode *inode = lsp->ls_state->inode;
5585         struct nfs_server *server = NFS_SERVER(inode);
5586         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5587
5588         p = kzalloc(sizeof(*p), gfp_mask);
5589         if (p == NULL)
5590                 return NULL;
5591
5592         p->arg.fh = NFS_FH(inode);
5593         p->arg.fl = &p->fl;
5594         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5595         if (IS_ERR(p->arg.open_seqid))
5596                 goto out_free;
5597         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5598         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5599         if (IS_ERR(p->arg.lock_seqid))
5600                 goto out_free_seqid;
5601         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5602         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5603         p->arg.lock_owner.s_dev = server->s_dev;
5604         p->res.lock_seqid = p->arg.lock_seqid;
5605         p->lsp = lsp;
5606         p->server = server;
5607         atomic_inc(&lsp->ls_count);
5608         p->ctx = get_nfs_open_context(ctx);
5609         memcpy(&p->fl, fl, sizeof(p->fl));
5610         return p;
5611 out_free_seqid:
5612         nfs_free_seqid(p->arg.open_seqid);
5613 out_free:
5614         kfree(p);
5615         return NULL;
5616 }
5617
5618 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5619 {
5620         struct nfs4_lockdata *data = calldata;
5621         struct nfs4_state *state = data->lsp->ls_state;
5622
5623         dprintk("%s: begin!\n", __func__);
5624         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5625                 goto out_wait;
5626         /* Do we need to do an open_to_lock_owner? */
5627         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5628                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5629                         goto out_release_lock_seqid;
5630                 }
5631                 nfs4_stateid_copy(&data->arg.open_stateid,
5632                                 &state->open_stateid);
5633                 data->arg.new_lock_owner = 1;
5634                 data->res.open_seqid = data->arg.open_seqid;
5635         } else {
5636                 data->arg.new_lock_owner = 0;
5637                 nfs4_stateid_copy(&data->arg.lock_stateid,
5638                                 &data->lsp->ls_stateid);
5639         }
5640         if (!nfs4_valid_open_stateid(state)) {
5641                 data->rpc_status = -EBADF;
5642                 task->tk_action = NULL;
5643                 goto out_release_open_seqid;
5644         }
5645         data->timestamp = jiffies;
5646         if (nfs4_setup_sequence(data->server,
5647                                 &data->arg.seq_args,
5648                                 &data->res.seq_res,
5649                                 task) == 0)
5650                 return;
5651 out_release_open_seqid:
5652         nfs_release_seqid(data->arg.open_seqid);
5653 out_release_lock_seqid:
5654         nfs_release_seqid(data->arg.lock_seqid);
5655 out_wait:
5656         nfs4_sequence_done(task, &data->res.seq_res);
5657         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5658 }
5659
5660 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5661 {
5662         struct nfs4_lockdata *data = calldata;
5663         struct nfs4_lock_state *lsp = data->lsp;
5664
5665         dprintk("%s: begin!\n", __func__);
5666
5667         if (!nfs4_sequence_done(task, &data->res.seq_res))
5668                 return;
5669
5670         data->rpc_status = task->tk_status;
5671         switch (task->tk_status) {
5672         case 0:
5673                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode),
5674                                 data->timestamp);
5675                 if (data->arg.new_lock) {
5676                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5677                         if (do_vfs_lock(data->fl.fl_file, &data->fl) < 0) {
5678                                 rpc_restart_call_prepare(task);
5679                                 break;
5680                         }
5681                 }
5682                 if (data->arg.new_lock_owner != 0) {
5683                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5684                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5685                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5686                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5687                         rpc_restart_call_prepare(task);
5688                 break;
5689         case -NFS4ERR_BAD_STATEID:
5690         case -NFS4ERR_OLD_STATEID:
5691         case -NFS4ERR_STALE_STATEID:
5692         case -NFS4ERR_EXPIRED:
5693                 if (data->arg.new_lock_owner != 0) {
5694                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5695                                                 &lsp->ls_state->open_stateid))
5696                                 rpc_restart_call_prepare(task);
5697                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5698                                                 &lsp->ls_stateid))
5699                                 rpc_restart_call_prepare(task);
5700         }
5701         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5702 }
5703
5704 static void nfs4_lock_release(void *calldata)
5705 {
5706         struct nfs4_lockdata *data = calldata;
5707
5708         dprintk("%s: begin!\n", __func__);
5709         nfs_free_seqid(data->arg.open_seqid);
5710         if (data->cancelled != 0) {
5711                 struct rpc_task *task;
5712                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5713                                 data->arg.lock_seqid);
5714                 if (!IS_ERR(task))
5715                         rpc_put_task_async(task);
5716                 dprintk("%s: cancelling lock!\n", __func__);
5717         } else
5718                 nfs_free_seqid(data->arg.lock_seqid);
5719         nfs4_put_lock_state(data->lsp);
5720         put_nfs_open_context(data->ctx);
5721         kfree(data);
5722         dprintk("%s: done!\n", __func__);
5723 }
5724
5725 static const struct rpc_call_ops nfs4_lock_ops = {
5726         .rpc_call_prepare = nfs4_lock_prepare,
5727         .rpc_call_done = nfs4_lock_done,
5728         .rpc_release = nfs4_lock_release,
5729 };
5730
5731 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5732 {
5733         switch (error) {
5734         case -NFS4ERR_ADMIN_REVOKED:
5735         case -NFS4ERR_BAD_STATEID:
5736                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5737                 if (new_lock_owner != 0 ||
5738                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5739                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5740                 break;
5741         case -NFS4ERR_STALE_STATEID:
5742                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5743         case -NFS4ERR_EXPIRED:
5744                 nfs4_schedule_lease_recovery(server->nfs_client);
5745         };
5746 }
5747
5748 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5749 {
5750         struct nfs4_lockdata *data;
5751         struct rpc_task *task;
5752         struct rpc_message msg = {
5753                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5754                 .rpc_cred = state->owner->so_cred,
5755         };
5756         struct rpc_task_setup task_setup_data = {
5757                 .rpc_client = NFS_CLIENT(state->inode),
5758                 .rpc_message = &msg,
5759                 .callback_ops = &nfs4_lock_ops,
5760                 .workqueue = nfsiod_workqueue,
5761                 .flags = RPC_TASK_ASYNC,
5762         };
5763         int ret;
5764
5765         dprintk("%s: begin!\n", __func__);
5766         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5767                         fl->fl_u.nfs4_fl.owner,
5768                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5769         if (data == NULL)
5770                 return -ENOMEM;
5771         if (IS_SETLKW(cmd))
5772                 data->arg.block = 1;
5773         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5774         msg.rpc_argp = &data->arg;
5775         msg.rpc_resp = &data->res;
5776         task_setup_data.callback_data = data;
5777         if (recovery_type > NFS_LOCK_NEW) {
5778                 if (recovery_type == NFS_LOCK_RECLAIM)
5779                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5780                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5781         } else
5782                 data->arg.new_lock = 1;
5783         task = rpc_run_task(&task_setup_data);
5784         if (IS_ERR(task))
5785                 return PTR_ERR(task);
5786         ret = nfs4_wait_for_completion_rpc_task(task);
5787         if (ret == 0) {
5788                 ret = data->rpc_status;
5789                 if (ret)
5790                         nfs4_handle_setlk_error(data->server, data->lsp,
5791                                         data->arg.new_lock_owner, ret);
5792         } else
5793                 data->cancelled = 1;
5794         rpc_put_task(task);
5795         dprintk("%s: done, ret = %d!\n", __func__, ret);
5796         return ret;
5797 }
5798
5799 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5800 {
5801         struct nfs_server *server = NFS_SERVER(state->inode);
5802         struct nfs4_exception exception = {
5803                 .inode = state->inode,
5804         };
5805         int err;
5806
5807         do {
5808                 /* Cache the lock if possible... */
5809                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5810                         return 0;
5811                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5812                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5813                 if (err != -NFS4ERR_DELAY)
5814                         break;
5815                 nfs4_handle_exception(server, err, &exception);
5816         } while (exception.retry);
5817         return err;
5818 }
5819
5820 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5821 {
5822         struct nfs_server *server = NFS_SERVER(state->inode);
5823         struct nfs4_exception exception = {
5824                 .inode = state->inode,
5825         };
5826         int err;
5827
5828         err = nfs4_set_lock_state(state, request);
5829         if (err != 0)
5830                 return err;
5831         if (!recover_lost_locks) {
5832                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5833                 return 0;
5834         }
5835         do {
5836                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5837                         return 0;
5838                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5839                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5840                 switch (err) {
5841                 default:
5842                         goto out;
5843                 case -NFS4ERR_GRACE:
5844                 case -NFS4ERR_DELAY:
5845                         nfs4_handle_exception(server, err, &exception);
5846                         err = 0;
5847                 }
5848         } while (exception.retry);
5849 out:
5850         return err;
5851 }
5852
5853 #if defined(CONFIG_NFS_V4_1)
5854 /**
5855  * nfs41_check_expired_locks - possibly free a lock stateid
5856  *
5857  * @state: NFSv4 state for an inode
5858  *
5859  * Returns NFS_OK if recovery for this stateid is now finished.
5860  * Otherwise a negative NFS4ERR value is returned.
5861  */
5862 static int nfs41_check_expired_locks(struct nfs4_state *state)
5863 {
5864         int status, ret = -NFS4ERR_BAD_STATEID;
5865         struct nfs4_lock_state *lsp;
5866         struct nfs_server *server = NFS_SERVER(state->inode);
5867
5868         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5869                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5870                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5871
5872                         status = nfs41_test_stateid(server,
5873                                         &lsp->ls_stateid,
5874                                         cred);
5875                         trace_nfs4_test_lock_stateid(state, lsp, status);
5876                         if (status != NFS_OK) {
5877                                 /* Free the stateid unless the server
5878                                  * informs us the stateid is unrecognized. */
5879                                 if (status != -NFS4ERR_BAD_STATEID)
5880                                         nfs41_free_stateid(server,
5881                                                         &lsp->ls_stateid,
5882                                                         cred);
5883                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5884                                 ret = status;
5885                         }
5886                 }
5887         };
5888
5889         return ret;
5890 }
5891
5892 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5893 {
5894         int status = NFS_OK;
5895
5896         if (test_bit(LK_STATE_IN_USE, &state->flags))
5897                 status = nfs41_check_expired_locks(state);
5898         if (status != NFS_OK)
5899                 status = nfs4_lock_expired(state, request);
5900         return status;
5901 }
5902 #endif
5903
5904 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5905 {
5906         struct nfs_inode *nfsi = NFS_I(state->inode);
5907         unsigned char fl_flags = request->fl_flags;
5908         int status = -ENOLCK;
5909
5910         if ((fl_flags & FL_POSIX) &&
5911                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5912                 goto out;
5913         /* Is this a delegated open? */
5914         status = nfs4_set_lock_state(state, request);
5915         if (status != 0)
5916                 goto out;
5917         request->fl_flags |= FL_ACCESS;
5918         status = do_vfs_lock(request->fl_file, request);
5919         if (status < 0)
5920                 goto out;
5921         down_read(&nfsi->rwsem);
5922         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5923                 /* Yes: cache locks! */
5924                 /* ...but avoid races with delegation recall... */
5925                 request->fl_flags = fl_flags & ~FL_SLEEP;
5926                 status = do_vfs_lock(request->fl_file, request);
5927                 up_read(&nfsi->rwsem);
5928                 goto out;
5929         }
5930         up_read(&nfsi->rwsem);
5931         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5932 out:
5933         request->fl_flags = fl_flags;
5934         return status;
5935 }
5936
5937 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5938 {
5939         struct nfs4_exception exception = {
5940                 .state = state,
5941                 .inode = state->inode,
5942         };
5943         int err;
5944
5945         do {
5946                 err = _nfs4_proc_setlk(state, cmd, request);
5947                 trace_nfs4_set_lock(request, state, cmd, err);
5948                 if (err == -NFS4ERR_DENIED)
5949                         err = -EAGAIN;
5950                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5951                                 err, &exception);
5952         } while (exception.retry);
5953         return err;
5954 }
5955
5956 static int
5957 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5958 {
5959         struct nfs_open_context *ctx;
5960         struct nfs4_state *state;
5961         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5962         int status;
5963
5964         /* verify open state */
5965         ctx = nfs_file_open_context(filp);
5966         state = ctx->state;
5967
5968         if (request->fl_start < 0 || request->fl_end < 0)
5969                 return -EINVAL;
5970
5971         if (IS_GETLK(cmd)) {
5972                 if (state != NULL)
5973                         return nfs4_proc_getlk(state, F_GETLK, request);
5974                 return 0;
5975         }
5976
5977         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5978                 return -EINVAL;
5979
5980         if (request->fl_type == F_UNLCK) {
5981                 if (state != NULL)
5982                         return nfs4_proc_unlck(state, cmd, request);
5983                 return 0;
5984         }
5985
5986         if (state == NULL)
5987                 return -ENOLCK;
5988         /*
5989          * Don't rely on the VFS having checked the file open mode,
5990          * since it won't do this for flock() locks.
5991          */
5992         switch (request->fl_type) {
5993         case F_RDLCK:
5994                 if (!(filp->f_mode & FMODE_READ))
5995                         return -EBADF;
5996                 break;
5997         case F_WRLCK:
5998                 if (!(filp->f_mode & FMODE_WRITE))
5999                         return -EBADF;
6000         }
6001
6002         do {
6003                 status = nfs4_proc_setlk(state, cmd, request);
6004                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6005                         break;
6006                 timeout = nfs4_set_lock_task_retry(timeout);
6007                 status = -ERESTARTSYS;
6008                 if (signalled())
6009                         break;
6010         } while(status < 0);
6011         return status;
6012 }
6013
6014 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6015 {
6016         struct nfs_server *server = NFS_SERVER(state->inode);
6017         int err;
6018
6019         err = nfs4_set_lock_state(state, fl);
6020         if (err != 0)
6021                 return err;
6022         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6023         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6024 }
6025
6026 struct nfs_release_lockowner_data {
6027         struct nfs4_lock_state *lsp;
6028         struct nfs_server *server;
6029         struct nfs_release_lockowner_args args;
6030         struct nfs_release_lockowner_res res;
6031         unsigned long timestamp;
6032 };
6033
6034 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6035 {
6036         struct nfs_release_lockowner_data *data = calldata;
6037         struct nfs_server *server = data->server;
6038         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6039                              &data->args.seq_args, &data->res.seq_res, task);
6040         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6041         data->timestamp = jiffies;
6042 }
6043
6044 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6045 {
6046         struct nfs_release_lockowner_data *data = calldata;
6047         struct nfs_server *server = data->server;
6048
6049         nfs40_sequence_done(task, &data->res.seq_res);
6050
6051         switch (task->tk_status) {
6052         case 0:
6053                 renew_lease(server, data->timestamp);
6054                 break;
6055         case -NFS4ERR_STALE_CLIENTID:
6056         case -NFS4ERR_EXPIRED:
6057                 nfs4_schedule_lease_recovery(server->nfs_client);
6058                 break;
6059         case -NFS4ERR_LEASE_MOVED:
6060         case -NFS4ERR_DELAY:
6061                 if (nfs4_async_handle_error(task, server,
6062                                             NULL, NULL) == -EAGAIN)
6063                         rpc_restart_call_prepare(task);
6064         }
6065 }
6066
6067 static void nfs4_release_lockowner_release(void *calldata)
6068 {
6069         struct nfs_release_lockowner_data *data = calldata;
6070         nfs4_free_lock_state(data->server, data->lsp);
6071         kfree(calldata);
6072 }
6073
6074 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6075         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6076         .rpc_call_done = nfs4_release_lockowner_done,
6077         .rpc_release = nfs4_release_lockowner_release,
6078 };
6079
6080 static void
6081 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6082 {
6083         struct nfs_release_lockowner_data *data;
6084         struct rpc_message msg = {
6085                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6086         };
6087
6088         if (server->nfs_client->cl_mvops->minor_version != 0)
6089                 return;
6090
6091         data = kmalloc(sizeof(*data), GFP_NOFS);
6092         if (!data)
6093                 return;
6094         data->lsp = lsp;
6095         data->server = server;
6096         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6097         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6098         data->args.lock_owner.s_dev = server->s_dev;
6099
6100         msg.rpc_argp = &data->args;
6101         msg.rpc_resp = &data->res;
6102         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6103         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6104 }
6105
6106 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6107
6108 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6109                                    const void *buf, size_t buflen,
6110                                    int flags, int type)
6111 {
6112         if (strcmp(key, "") != 0)
6113                 return -EINVAL;
6114
6115         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
6116 }
6117
6118 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6119                                    void *buf, size_t buflen, int type)
6120 {
6121         if (strcmp(key, "") != 0)
6122                 return -EINVAL;
6123
6124         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
6125 }
6126
6127 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6128                                        size_t list_len, const char *name,
6129                                        size_t name_len, int type)
6130 {
6131         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6132
6133         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
6134                 return 0;
6135
6136         if (list && len <= list_len)
6137                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6138         return len;
6139 }
6140
6141 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6142 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6143 {
6144         return server->caps & NFS_CAP_SECURITY_LABEL;
6145 }
6146
6147 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6148                                    const void *buf, size_t buflen,
6149                                    int flags, int type)
6150 {
6151         if (security_ismaclabel(key))
6152                 return nfs4_set_security_label(dentry, buf, buflen);
6153
6154         return -EOPNOTSUPP;
6155 }
6156
6157 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6158                                    void *buf, size_t buflen, int type)
6159 {
6160         if (security_ismaclabel(key))
6161                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
6162         return -EOPNOTSUPP;
6163 }
6164
6165 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6166                                        size_t list_len, const char *name,
6167                                        size_t name_len, int type)
6168 {
6169         size_t len = 0;
6170
6171         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
6172                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
6173                 if (list && len <= list_len)
6174                         security_inode_listsecurity(dentry->d_inode, list, len);
6175         }
6176         return len;
6177 }
6178
6179 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6180         .prefix = XATTR_SECURITY_PREFIX,
6181         .list   = nfs4_xattr_list_nfs4_label,
6182         .get    = nfs4_xattr_get_nfs4_label,
6183         .set    = nfs4_xattr_set_nfs4_label,
6184 };
6185 #endif
6186
6187
6188 /*
6189  * nfs_fhget will use either the mounted_on_fileid or the fileid
6190  */
6191 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6192 {
6193         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6194                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6195               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6196               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6197                 return;
6198
6199         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6200                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6201         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6202         fattr->nlink = 2;
6203 }
6204
6205 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6206                                    const struct qstr *name,
6207                                    struct nfs4_fs_locations *fs_locations,
6208                                    struct page *page)
6209 {
6210         struct nfs_server *server = NFS_SERVER(dir);
6211         u32 bitmask[3] = {
6212                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6213         };
6214         struct nfs4_fs_locations_arg args = {
6215                 .dir_fh = NFS_FH(dir),
6216                 .name = name,
6217                 .page = page,
6218                 .bitmask = bitmask,
6219         };
6220         struct nfs4_fs_locations_res res = {
6221                 .fs_locations = fs_locations,
6222         };
6223         struct rpc_message msg = {
6224                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6225                 .rpc_argp = &args,
6226                 .rpc_resp = &res,
6227         };
6228         int status;
6229
6230         dprintk("%s: start\n", __func__);
6231
6232         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6233          * is not supported */
6234         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6235                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6236         else
6237                 bitmask[0] |= FATTR4_WORD0_FILEID;
6238
6239         nfs_fattr_init(&fs_locations->fattr);
6240         fs_locations->server = server;
6241         fs_locations->nlocations = 0;
6242         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6243         dprintk("%s: returned status = %d\n", __func__, status);
6244         return status;
6245 }
6246
6247 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6248                            const struct qstr *name,
6249                            struct nfs4_fs_locations *fs_locations,
6250                            struct page *page)
6251 {
6252         struct nfs4_exception exception = { };
6253         int err;
6254         do {
6255                 err = _nfs4_proc_fs_locations(client, dir, name,
6256                                 fs_locations, page);
6257                 trace_nfs4_get_fs_locations(dir, name, err);
6258                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6259                                 &exception);
6260         } while (exception.retry);
6261         return err;
6262 }
6263
6264 /*
6265  * This operation also signals the server that this client is
6266  * performing migration recovery.  The server can stop returning
6267  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6268  * appended to this compound to identify the client ID which is
6269  * performing recovery.
6270  */
6271 static int _nfs40_proc_get_locations(struct inode *inode,
6272                                      struct nfs4_fs_locations *locations,
6273                                      struct page *page, struct rpc_cred *cred)
6274 {
6275         struct nfs_server *server = NFS_SERVER(inode);
6276         struct rpc_clnt *clnt = server->client;
6277         u32 bitmask[2] = {
6278                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6279         };
6280         struct nfs4_fs_locations_arg args = {
6281                 .clientid       = server->nfs_client->cl_clientid,
6282                 .fh             = NFS_FH(inode),
6283                 .page           = page,
6284                 .bitmask        = bitmask,
6285                 .migration      = 1,            /* skip LOOKUP */
6286                 .renew          = 1,            /* append RENEW */
6287         };
6288         struct nfs4_fs_locations_res res = {
6289                 .fs_locations   = locations,
6290                 .migration      = 1,
6291                 .renew          = 1,
6292         };
6293         struct rpc_message msg = {
6294                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6295                 .rpc_argp       = &args,
6296                 .rpc_resp       = &res,
6297                 .rpc_cred       = cred,
6298         };
6299         unsigned long now = jiffies;
6300         int status;
6301
6302         nfs_fattr_init(&locations->fattr);
6303         locations->server = server;
6304         locations->nlocations = 0;
6305
6306         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6307         nfs4_set_sequence_privileged(&args.seq_args);
6308         status = nfs4_call_sync_sequence(clnt, server, &msg,
6309                                         &args.seq_args, &res.seq_res);
6310         if (status)
6311                 return status;
6312
6313         renew_lease(server, now);
6314         return 0;
6315 }
6316
6317 #ifdef CONFIG_NFS_V4_1
6318
6319 /*
6320  * This operation also signals the server that this client is
6321  * performing migration recovery.  The server can stop asserting
6322  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6323  * performing this operation is identified in the SEQUENCE
6324  * operation in this compound.
6325  *
6326  * When the client supports GETATTR(fs_locations_info), it can
6327  * be plumbed in here.
6328  */
6329 static int _nfs41_proc_get_locations(struct inode *inode,
6330                                      struct nfs4_fs_locations *locations,
6331                                      struct page *page, struct rpc_cred *cred)
6332 {
6333         struct nfs_server *server = NFS_SERVER(inode);
6334         struct rpc_clnt *clnt = server->client;
6335         u32 bitmask[2] = {
6336                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6337         };
6338         struct nfs4_fs_locations_arg args = {
6339                 .fh             = NFS_FH(inode),
6340                 .page           = page,
6341                 .bitmask        = bitmask,
6342                 .migration      = 1,            /* skip LOOKUP */
6343         };
6344         struct nfs4_fs_locations_res res = {
6345                 .fs_locations   = locations,
6346                 .migration      = 1,
6347         };
6348         struct rpc_message msg = {
6349                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6350                 .rpc_argp       = &args,
6351                 .rpc_resp       = &res,
6352                 .rpc_cred       = cred,
6353         };
6354         int status;
6355
6356         nfs_fattr_init(&locations->fattr);
6357         locations->server = server;
6358         locations->nlocations = 0;
6359
6360         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6361         nfs4_set_sequence_privileged(&args.seq_args);
6362         status = nfs4_call_sync_sequence(clnt, server, &msg,
6363                                         &args.seq_args, &res.seq_res);
6364         if (status == NFS4_OK &&
6365             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6366                 status = -NFS4ERR_LEASE_MOVED;
6367         return status;
6368 }
6369
6370 #endif  /* CONFIG_NFS_V4_1 */
6371
6372 /**
6373  * nfs4_proc_get_locations - discover locations for a migrated FSID
6374  * @inode: inode on FSID that is migrating
6375  * @locations: result of query
6376  * @page: buffer
6377  * @cred: credential to use for this operation
6378  *
6379  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6380  * operation failed, or a negative errno if a local error occurred.
6381  *
6382  * On success, "locations" is filled in, but if the server has
6383  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6384  * asserted.
6385  *
6386  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6387  * from this client that require migration recovery.
6388  */
6389 int nfs4_proc_get_locations(struct inode *inode,
6390                             struct nfs4_fs_locations *locations,
6391                             struct page *page, struct rpc_cred *cred)
6392 {
6393         struct nfs_server *server = NFS_SERVER(inode);
6394         struct nfs_client *clp = server->nfs_client;
6395         const struct nfs4_mig_recovery_ops *ops =
6396                                         clp->cl_mvops->mig_recovery_ops;
6397         struct nfs4_exception exception = { };
6398         int status;
6399
6400         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6401                 (unsigned long long)server->fsid.major,
6402                 (unsigned long long)server->fsid.minor,
6403                 clp->cl_hostname);
6404         nfs_display_fhandle(NFS_FH(inode), __func__);
6405
6406         do {
6407                 status = ops->get_locations(inode, locations, page, cred);
6408                 if (status != -NFS4ERR_DELAY)
6409                         break;
6410                 nfs4_handle_exception(server, status, &exception);
6411         } while (exception.retry);
6412         return status;
6413 }
6414
6415 /*
6416  * This operation also signals the server that this client is
6417  * performing "lease moved" recovery.  The server can stop
6418  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6419  * is appended to this compound to identify the client ID which is
6420  * performing recovery.
6421  */
6422 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6423 {
6424         struct nfs_server *server = NFS_SERVER(inode);
6425         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6426         struct rpc_clnt *clnt = server->client;
6427         struct nfs4_fsid_present_arg args = {
6428                 .fh             = NFS_FH(inode),
6429                 .clientid       = clp->cl_clientid,
6430                 .renew          = 1,            /* append RENEW */
6431         };
6432         struct nfs4_fsid_present_res res = {
6433                 .renew          = 1,
6434         };
6435         struct rpc_message msg = {
6436                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6437                 .rpc_argp       = &args,
6438                 .rpc_resp       = &res,
6439                 .rpc_cred       = cred,
6440         };
6441         unsigned long now = jiffies;
6442         int status;
6443
6444         res.fh = nfs_alloc_fhandle();
6445         if (res.fh == NULL)
6446                 return -ENOMEM;
6447
6448         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6449         nfs4_set_sequence_privileged(&args.seq_args);
6450         status = nfs4_call_sync_sequence(clnt, server, &msg,
6451                                                 &args.seq_args, &res.seq_res);
6452         nfs_free_fhandle(res.fh);
6453         if (status)
6454                 return status;
6455
6456         do_renew_lease(clp, now);
6457         return 0;
6458 }
6459
6460 #ifdef CONFIG_NFS_V4_1
6461
6462 /*
6463  * This operation also signals the server that this client is
6464  * performing "lease moved" recovery.  The server can stop asserting
6465  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6466  * this operation is identified in the SEQUENCE operation in this
6467  * compound.
6468  */
6469 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6470 {
6471         struct nfs_server *server = NFS_SERVER(inode);
6472         struct rpc_clnt *clnt = server->client;
6473         struct nfs4_fsid_present_arg args = {
6474                 .fh             = NFS_FH(inode),
6475         };
6476         struct nfs4_fsid_present_res res = {
6477         };
6478         struct rpc_message msg = {
6479                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6480                 .rpc_argp       = &args,
6481                 .rpc_resp       = &res,
6482                 .rpc_cred       = cred,
6483         };
6484         int status;
6485
6486         res.fh = nfs_alloc_fhandle();
6487         if (res.fh == NULL)
6488                 return -ENOMEM;
6489
6490         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6491         nfs4_set_sequence_privileged(&args.seq_args);
6492         status = nfs4_call_sync_sequence(clnt, server, &msg,
6493                                                 &args.seq_args, &res.seq_res);
6494         nfs_free_fhandle(res.fh);
6495         if (status == NFS4_OK &&
6496             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6497                 status = -NFS4ERR_LEASE_MOVED;
6498         return status;
6499 }
6500
6501 #endif  /* CONFIG_NFS_V4_1 */
6502
6503 /**
6504  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6505  * @inode: inode on FSID to check
6506  * @cred: credential to use for this operation
6507  *
6508  * Server indicates whether the FSID is present, moved, or not
6509  * recognized.  This operation is necessary to clear a LEASE_MOVED
6510  * condition for this client ID.
6511  *
6512  * Returns NFS4_OK if the FSID is present on this server,
6513  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6514  *  NFS4ERR code if some error occurred on the server, or a
6515  *  negative errno if a local failure occurred.
6516  */
6517 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6518 {
6519         struct nfs_server *server = NFS_SERVER(inode);
6520         struct nfs_client *clp = server->nfs_client;
6521         const struct nfs4_mig_recovery_ops *ops =
6522                                         clp->cl_mvops->mig_recovery_ops;
6523         struct nfs4_exception exception = { };
6524         int status;
6525
6526         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6527                 (unsigned long long)server->fsid.major,
6528                 (unsigned long long)server->fsid.minor,
6529                 clp->cl_hostname);
6530         nfs_display_fhandle(NFS_FH(inode), __func__);
6531
6532         do {
6533                 status = ops->fsid_present(inode, cred);
6534                 if (status != -NFS4ERR_DELAY)
6535                         break;
6536                 nfs4_handle_exception(server, status, &exception);
6537         } while (exception.retry);
6538         return status;
6539 }
6540
6541 /**
6542  * If 'use_integrity' is true and the state managment nfs_client
6543  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6544  * and the machine credential as per RFC3530bis and RFC5661 Security
6545  * Considerations sections. Otherwise, just use the user cred with the
6546  * filesystem's rpc_client.
6547  */
6548 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6549 {
6550         int status;
6551         struct nfs4_secinfo_arg args = {
6552                 .dir_fh = NFS_FH(dir),
6553                 .name   = name,
6554         };
6555         struct nfs4_secinfo_res res = {
6556                 .flavors     = flavors,
6557         };
6558         struct rpc_message msg = {
6559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6560                 .rpc_argp = &args,
6561                 .rpc_resp = &res,
6562         };
6563         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6564         struct rpc_cred *cred = NULL;
6565
6566         if (use_integrity) {
6567                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6568                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6569                 msg.rpc_cred = cred;
6570         }
6571
6572         dprintk("NFS call  secinfo %s\n", name->name);
6573
6574         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6575                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6576
6577         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6578                                 &res.seq_res, 0);
6579         dprintk("NFS reply  secinfo: %d\n", status);
6580
6581         if (cred)
6582                 put_rpccred(cred);
6583
6584         return status;
6585 }
6586
6587 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6588                       struct nfs4_secinfo_flavors *flavors)
6589 {
6590         struct nfs4_exception exception = { };
6591         int err;
6592         do {
6593                 err = -NFS4ERR_WRONGSEC;
6594
6595                 /* try to use integrity protection with machine cred */
6596                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6597                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6598
6599                 /*
6600                  * if unable to use integrity protection, or SECINFO with
6601                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6602                  * disallowed by spec, but exists in deployed servers) use
6603                  * the current filesystem's rpc_client and the user cred.
6604                  */
6605                 if (err == -NFS4ERR_WRONGSEC)
6606                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6607
6608                 trace_nfs4_secinfo(dir, name, err);
6609                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6610                                 &exception);
6611         } while (exception.retry);
6612         return err;
6613 }
6614
6615 #ifdef CONFIG_NFS_V4_1
6616 /*
6617  * Check the exchange flags returned by the server for invalid flags, having
6618  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6619  * DS flags set.
6620  */
6621 static int nfs4_check_cl_exchange_flags(u32 flags)
6622 {
6623         if (flags & ~EXCHGID4_FLAG_MASK_R)
6624                 goto out_inval;
6625         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6626             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6627                 goto out_inval;
6628         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6629                 goto out_inval;
6630         return NFS_OK;
6631 out_inval:
6632         return -NFS4ERR_INVAL;
6633 }
6634
6635 static bool
6636 nfs41_same_server_scope(struct nfs41_server_scope *a,
6637                         struct nfs41_server_scope *b)
6638 {
6639         if (a->server_scope_sz == b->server_scope_sz &&
6640             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6641                 return true;
6642
6643         return false;
6644 }
6645
6646 /*
6647  * nfs4_proc_bind_conn_to_session()
6648  *
6649  * The 4.1 client currently uses the same TCP connection for the
6650  * fore and backchannel.
6651  */
6652 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6653 {
6654         int status;
6655         struct nfs41_bind_conn_to_session_args args = {
6656                 .client = clp,
6657                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
6658         };
6659         struct nfs41_bind_conn_to_session_res res;
6660         struct rpc_message msg = {
6661                 .rpc_proc =
6662                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6663                 .rpc_argp = &args,
6664                 .rpc_resp = &res,
6665                 .rpc_cred = cred,
6666         };
6667
6668         dprintk("--> %s\n", __func__);
6669
6670         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
6671         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
6672                 args.dir = NFS4_CDFC4_FORE;
6673
6674         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6675         trace_nfs4_bind_conn_to_session(clp, status);
6676         if (status == 0) {
6677                 if (memcmp(res.sessionid.data,
6678                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6679                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6680                         status = -EIO;
6681                         goto out;
6682                 }
6683                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
6684                         dprintk("NFS: %s: Unexpected direction from server\n",
6685                                 __func__);
6686                         status = -EIO;
6687                         goto out;
6688                 }
6689                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
6690                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6691                                 __func__);
6692                         status = -EIO;
6693                         goto out;
6694                 }
6695         }
6696 out:
6697         dprintk("<-- %s status= %d\n", __func__, status);
6698         return status;
6699 }
6700
6701 /*
6702  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6703  * and operations we'd like to see to enable certain features in the allow map
6704  */
6705 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6706         .how = SP4_MACH_CRED,
6707         .enforce.u.words = {
6708                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6709                       1 << (OP_EXCHANGE_ID - 32) |
6710                       1 << (OP_CREATE_SESSION - 32) |
6711                       1 << (OP_DESTROY_SESSION - 32) |
6712                       1 << (OP_DESTROY_CLIENTID - 32)
6713         },
6714         .allow.u.words = {
6715                 [0] = 1 << (OP_CLOSE) |
6716                       1 << (OP_LOCKU) |
6717                       1 << (OP_COMMIT),
6718                 [1] = 1 << (OP_SECINFO - 32) |
6719                       1 << (OP_SECINFO_NO_NAME - 32) |
6720                       1 << (OP_TEST_STATEID - 32) |
6721                       1 << (OP_FREE_STATEID - 32) |
6722                       1 << (OP_WRITE - 32)
6723         }
6724 };
6725
6726 /*
6727  * Select the state protection mode for client `clp' given the server results
6728  * from exchange_id in `sp'.
6729  *
6730  * Returns 0 on success, negative errno otherwise.
6731  */
6732 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6733                                  struct nfs41_state_protection *sp)
6734 {
6735         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6736                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6737                       1 << (OP_EXCHANGE_ID - 32) |
6738                       1 << (OP_CREATE_SESSION - 32) |
6739                       1 << (OP_DESTROY_SESSION - 32) |
6740                       1 << (OP_DESTROY_CLIENTID - 32)
6741         };
6742         unsigned int i;
6743
6744         if (sp->how == SP4_MACH_CRED) {
6745                 /* Print state protect result */
6746                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6747                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6748                         if (test_bit(i, sp->enforce.u.longs))
6749                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6750                         if (test_bit(i, sp->allow.u.longs))
6751                                 dfprintk(MOUNT, "  allow op %d\n", i);
6752                 }
6753
6754                 /* make sure nothing is on enforce list that isn't supported */
6755                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6756                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6757                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6758                                 return -EINVAL;
6759                         }
6760                 }
6761
6762                 /*
6763                  * Minimal mode - state operations are allowed to use machine
6764                  * credential.  Note this already happens by default, so the
6765                  * client doesn't have to do anything more than the negotiation.
6766                  *
6767                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6768                  *       we're already using the machine cred for exchange_id
6769                  *       and will never use a different cred.
6770                  */
6771                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6772                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6773                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6774                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6775                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6776                         dfprintk(MOUNT, "  minimal mode enabled\n");
6777                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6778                 } else {
6779                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6780                         return -EINVAL;
6781                 }
6782
6783                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6784                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6785                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6786                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6787                 }
6788
6789                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6790                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6791                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6792                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6793                 }
6794
6795                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6796                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6797                         dfprintk(MOUNT, "  stateid mode enabled\n");
6798                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6799                 }
6800
6801                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6802                         dfprintk(MOUNT, "  write mode enabled\n");
6803                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6804                 }
6805
6806                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6807                         dfprintk(MOUNT, "  commit mode enabled\n");
6808                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6809                 }
6810         }
6811
6812         return 0;
6813 }
6814
6815 /*
6816  * _nfs4_proc_exchange_id()
6817  *
6818  * Wrapper for EXCHANGE_ID operation.
6819  */
6820 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6821         u32 sp4_how)
6822 {
6823         nfs4_verifier verifier;
6824         struct nfs41_exchange_id_args args = {
6825                 .verifier = &verifier,
6826                 .client = clp,
6827 #ifdef CONFIG_NFS_V4_1_MIGRATION
6828                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6829                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6830                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6831 #else
6832                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6833                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6834 #endif
6835         };
6836         struct nfs41_exchange_id_res res = {
6837                 0
6838         };
6839         int status;
6840         struct rpc_message msg = {
6841                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6842                 .rpc_argp = &args,
6843                 .rpc_resp = &res,
6844                 .rpc_cred = cred,
6845         };
6846
6847         nfs4_init_boot_verifier(clp, &verifier);
6848         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6849                                                         sizeof(args.id));
6850         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6851                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6852                 args.id_len, args.id);
6853
6854         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6855                                         GFP_NOFS);
6856         if (unlikely(res.server_owner == NULL)) {
6857                 status = -ENOMEM;
6858                 goto out;
6859         }
6860
6861         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6862                                         GFP_NOFS);
6863         if (unlikely(res.server_scope == NULL)) {
6864                 status = -ENOMEM;
6865                 goto out_server_owner;
6866         }
6867
6868         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6869         if (unlikely(res.impl_id == NULL)) {
6870                 status = -ENOMEM;
6871                 goto out_server_scope;
6872         }
6873
6874         switch (sp4_how) {
6875         case SP4_NONE:
6876                 args.state_protect.how = SP4_NONE;
6877                 break;
6878
6879         case SP4_MACH_CRED:
6880                 args.state_protect = nfs4_sp4_mach_cred_request;
6881                 break;
6882
6883         default:
6884                 /* unsupported! */
6885                 WARN_ON_ONCE(1);
6886                 status = -EINVAL;
6887                 goto out_server_scope;
6888         }
6889
6890         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6891         trace_nfs4_exchange_id(clp, status);
6892         if (status == 0)
6893                 status = nfs4_check_cl_exchange_flags(res.flags);
6894
6895         if (status == 0)
6896                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6897
6898         if (status == 0) {
6899                 clp->cl_clientid = res.clientid;
6900                 clp->cl_exchange_flags = res.flags;
6901                 /* Client ID is not confirmed */
6902                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
6903                         clear_bit(NFS4_SESSION_ESTABLISHED,
6904                                         &clp->cl_session->session_state);
6905                         clp->cl_seqid = res.seqid;
6906                 }
6907
6908                 kfree(clp->cl_serverowner);
6909                 clp->cl_serverowner = res.server_owner;
6910                 res.server_owner = NULL;
6911
6912                 /* use the most recent implementation id */
6913                 kfree(clp->cl_implid);
6914                 clp->cl_implid = res.impl_id;
6915
6916                 if (clp->cl_serverscope != NULL &&
6917                     !nfs41_same_server_scope(clp->cl_serverscope,
6918                                              res.server_scope)) {
6919                         dprintk("%s: server_scope mismatch detected\n",
6920                                 __func__);
6921                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6922                         kfree(clp->cl_serverscope);
6923                         clp->cl_serverscope = NULL;
6924                 }
6925
6926                 if (clp->cl_serverscope == NULL) {
6927                         clp->cl_serverscope = res.server_scope;
6928                         goto out;
6929                 }
6930         } else
6931                 kfree(res.impl_id);
6932
6933 out_server_owner:
6934         kfree(res.server_owner);
6935 out_server_scope:
6936         kfree(res.server_scope);
6937 out:
6938         if (clp->cl_implid != NULL)
6939                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6940                         "domain: %s, name: %s, date: %llu,%u\n",
6941                         clp->cl_implid->domain, clp->cl_implid->name,
6942                         clp->cl_implid->date.seconds,
6943                         clp->cl_implid->date.nseconds);
6944         dprintk("NFS reply exchange_id: %d\n", status);
6945         return status;
6946 }
6947
6948 /*
6949  * nfs4_proc_exchange_id()
6950  *
6951  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6952  *
6953  * Since the clientid has expired, all compounds using sessions
6954  * associated with the stale clientid will be returning
6955  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6956  * be in some phase of session reset.
6957  *
6958  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6959  */
6960 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6961 {
6962         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6963         int status;
6964
6965         /* try SP4_MACH_CRED if krb5i/p */
6966         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6967             authflavor == RPC_AUTH_GSS_KRB5P) {
6968                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6969                 if (!status)
6970                         return 0;
6971         }
6972
6973         /* try SP4_NONE */
6974         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6975 }
6976
6977 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6978                 struct rpc_cred *cred)
6979 {
6980         struct rpc_message msg = {
6981                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6982                 .rpc_argp = clp,
6983                 .rpc_cred = cred,
6984         };
6985         int status;
6986
6987         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6988         trace_nfs4_destroy_clientid(clp, status);
6989         if (status)
6990                 dprintk("NFS: Got error %d from the server %s on "
6991                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6992         return status;
6993 }
6994
6995 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6996                 struct rpc_cred *cred)
6997 {
6998         unsigned int loop;
6999         int ret;
7000
7001         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7002                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7003                 switch (ret) {
7004                 case -NFS4ERR_DELAY:
7005                 case -NFS4ERR_CLIENTID_BUSY:
7006                         ssleep(1);
7007                         break;
7008                 default:
7009                         return ret;
7010                 }
7011         }
7012         return 0;
7013 }
7014
7015 int nfs4_destroy_clientid(struct nfs_client *clp)
7016 {
7017         struct rpc_cred *cred;
7018         int ret = 0;
7019
7020         if (clp->cl_mvops->minor_version < 1)
7021                 goto out;
7022         if (clp->cl_exchange_flags == 0)
7023                 goto out;
7024         if (clp->cl_preserve_clid)
7025                 goto out;
7026         cred = nfs4_get_clid_cred(clp);
7027         ret = nfs4_proc_destroy_clientid(clp, cred);
7028         if (cred)
7029                 put_rpccred(cred);
7030         switch (ret) {
7031         case 0:
7032         case -NFS4ERR_STALE_CLIENTID:
7033                 clp->cl_exchange_flags = 0;
7034         }
7035 out:
7036         return ret;
7037 }
7038
7039 struct nfs4_get_lease_time_data {
7040         struct nfs4_get_lease_time_args *args;
7041         struct nfs4_get_lease_time_res *res;
7042         struct nfs_client *clp;
7043 };
7044
7045 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7046                                         void *calldata)
7047 {
7048         struct nfs4_get_lease_time_data *data =
7049                         (struct nfs4_get_lease_time_data *)calldata;
7050
7051         dprintk("--> %s\n", __func__);
7052         /* just setup sequence, do not trigger session recovery
7053            since we're invoked within one */
7054         nfs41_setup_sequence(data->clp->cl_session,
7055                         &data->args->la_seq_args,
7056                         &data->res->lr_seq_res,
7057                         task);
7058         dprintk("<-- %s\n", __func__);
7059 }
7060
7061 /*
7062  * Called from nfs4_state_manager thread for session setup, so don't recover
7063  * from sequence operation or clientid errors.
7064  */
7065 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7066 {
7067         struct nfs4_get_lease_time_data *data =
7068                         (struct nfs4_get_lease_time_data *)calldata;
7069
7070         dprintk("--> %s\n", __func__);
7071         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7072                 return;
7073         switch (task->tk_status) {
7074         case -NFS4ERR_DELAY:
7075         case -NFS4ERR_GRACE:
7076                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7077                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7078                 task->tk_status = 0;
7079                 /* fall through */
7080         case -NFS4ERR_RETRY_UNCACHED_REP:
7081                 rpc_restart_call_prepare(task);
7082                 return;
7083         }
7084         dprintk("<-- %s\n", __func__);
7085 }
7086
7087 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7088         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7089         .rpc_call_done = nfs4_get_lease_time_done,
7090 };
7091
7092 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7093 {
7094         struct rpc_task *task;
7095         struct nfs4_get_lease_time_args args;
7096         struct nfs4_get_lease_time_res res = {
7097                 .lr_fsinfo = fsinfo,
7098         };
7099         struct nfs4_get_lease_time_data data = {
7100                 .args = &args,
7101                 .res = &res,
7102                 .clp = clp,
7103         };
7104         struct rpc_message msg = {
7105                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7106                 .rpc_argp = &args,
7107                 .rpc_resp = &res,
7108         };
7109         struct rpc_task_setup task_setup = {
7110                 .rpc_client = clp->cl_rpcclient,
7111                 .rpc_message = &msg,
7112                 .callback_ops = &nfs4_get_lease_time_ops,
7113                 .callback_data = &data,
7114                 .flags = RPC_TASK_TIMEOUT,
7115         };
7116         int status;
7117
7118         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7119         nfs4_set_sequence_privileged(&args.la_seq_args);
7120         dprintk("--> %s\n", __func__);
7121         task = rpc_run_task(&task_setup);
7122
7123         if (IS_ERR(task))
7124                 status = PTR_ERR(task);
7125         else {
7126                 status = task->tk_status;
7127                 rpc_put_task(task);
7128         }
7129         dprintk("<-- %s return %d\n", __func__, status);
7130
7131         return status;
7132 }
7133
7134 /*
7135  * Initialize the values to be used by the client in CREATE_SESSION
7136  * If nfs4_init_session set the fore channel request and response sizes,
7137  * use them.
7138  *
7139  * Set the back channel max_resp_sz_cached to zero to force the client to
7140  * always set csa_cachethis to FALSE because the current implementation
7141  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7142  */
7143 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7144 {
7145         unsigned int max_rqst_sz, max_resp_sz;
7146
7147         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7148         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7149
7150         /* Fore channel attributes */
7151         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7152         args->fc_attrs.max_resp_sz = max_resp_sz;
7153         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7154         args->fc_attrs.max_reqs = max_session_slots;
7155
7156         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7157                 "max_ops=%u max_reqs=%u\n",
7158                 __func__,
7159                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7160                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7161
7162         /* Back channel attributes */
7163         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7164         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7165         args->bc_attrs.max_resp_sz_cached = 0;
7166         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7167         args->bc_attrs.max_reqs = 1;
7168
7169         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7170                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7171                 __func__,
7172                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7173                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7174                 args->bc_attrs.max_reqs);
7175 }
7176
7177 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7178                 struct nfs41_create_session_res *res)
7179 {
7180         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7181         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7182
7183         if (rcvd->max_resp_sz > sent->max_resp_sz)
7184                 return -EINVAL;
7185         /*
7186          * Our requested max_ops is the minimum we need; we're not
7187          * prepared to break up compounds into smaller pieces than that.
7188          * So, no point even trying to continue if the server won't
7189          * cooperate:
7190          */
7191         if (rcvd->max_ops < sent->max_ops)
7192                 return -EINVAL;
7193         if (rcvd->max_reqs == 0)
7194                 return -EINVAL;
7195         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7196                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7197         return 0;
7198 }
7199
7200 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7201                 struct nfs41_create_session_res *res)
7202 {
7203         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7204         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7205
7206         if (!(res->flags & SESSION4_BACK_CHAN))
7207                 goto out;
7208         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7209                 return -EINVAL;
7210         if (rcvd->max_resp_sz < sent->max_resp_sz)
7211                 return -EINVAL;
7212         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7213                 return -EINVAL;
7214         /* These would render the backchannel useless: */
7215         if (rcvd->max_ops != sent->max_ops)
7216                 return -EINVAL;
7217         if (rcvd->max_reqs != sent->max_reqs)
7218                 return -EINVAL;
7219 out:
7220         return 0;
7221 }
7222
7223 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7224                                      struct nfs41_create_session_res *res)
7225 {
7226         int ret;
7227
7228         ret = nfs4_verify_fore_channel_attrs(args, res);
7229         if (ret)
7230                 return ret;
7231         return nfs4_verify_back_channel_attrs(args, res);
7232 }
7233
7234 static void nfs4_update_session(struct nfs4_session *session,
7235                 struct nfs41_create_session_res *res)
7236 {
7237         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7238         /* Mark client id and session as being confirmed */
7239         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7240         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7241         session->flags = res->flags;
7242         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7243         if (res->flags & SESSION4_BACK_CHAN)
7244                 memcpy(&session->bc_attrs, &res->bc_attrs,
7245                                 sizeof(session->bc_attrs));
7246 }
7247
7248 static int _nfs4_proc_create_session(struct nfs_client *clp,
7249                 struct rpc_cred *cred)
7250 {
7251         struct nfs4_session *session = clp->cl_session;
7252         struct nfs41_create_session_args args = {
7253                 .client = clp,
7254                 .clientid = clp->cl_clientid,
7255                 .seqid = clp->cl_seqid,
7256                 .cb_program = NFS4_CALLBACK,
7257         };
7258         struct nfs41_create_session_res res;
7259
7260         struct rpc_message msg = {
7261                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7262                 .rpc_argp = &args,
7263                 .rpc_resp = &res,
7264                 .rpc_cred = cred,
7265         };
7266         int status;
7267
7268         nfs4_init_channel_attrs(&args);
7269         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7270
7271         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7272         trace_nfs4_create_session(clp, status);
7273
7274         if (!status) {
7275                 /* Verify the session's negotiated channel_attrs values */
7276                 status = nfs4_verify_channel_attrs(&args, &res);
7277                 /* Increment the clientid slot sequence id */
7278                 if (clp->cl_seqid == res.seqid)
7279                         clp->cl_seqid++;
7280                 if (status)
7281                         goto out;
7282                 nfs4_update_session(session, &res);
7283         }
7284 out:
7285         return status;
7286 }
7287
7288 /*
7289  * Issues a CREATE_SESSION operation to the server.
7290  * It is the responsibility of the caller to verify the session is
7291  * expired before calling this routine.
7292  */
7293 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7294 {
7295         int status;
7296         unsigned *ptr;
7297         struct nfs4_session *session = clp->cl_session;
7298
7299         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7300
7301         status = _nfs4_proc_create_session(clp, cred);
7302         if (status)
7303                 goto out;
7304
7305         /* Init or reset the session slot tables */
7306         status = nfs4_setup_session_slot_tables(session);
7307         dprintk("slot table setup returned %d\n", status);
7308         if (status)
7309                 goto out;
7310
7311         ptr = (unsigned *)&session->sess_id.data[0];
7312         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7313                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7314 out:
7315         dprintk("<-- %s\n", __func__);
7316         return status;
7317 }
7318
7319 /*
7320  * Issue the over-the-wire RPC DESTROY_SESSION.
7321  * The caller must serialize access to this routine.
7322  */
7323 int nfs4_proc_destroy_session(struct nfs4_session *session,
7324                 struct rpc_cred *cred)
7325 {
7326         struct rpc_message msg = {
7327                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7328                 .rpc_argp = session,
7329                 .rpc_cred = cred,
7330         };
7331         int status = 0;
7332
7333         dprintk("--> nfs4_proc_destroy_session\n");
7334
7335         /* session is still being setup */
7336         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7337                 return 0;
7338
7339         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7340         trace_nfs4_destroy_session(session->clp, status);
7341
7342         if (status)
7343                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7344                         "Session has been destroyed regardless...\n", status);
7345
7346         dprintk("<-- nfs4_proc_destroy_session\n");
7347         return status;
7348 }
7349
7350 /*
7351  * Renew the cl_session lease.
7352  */
7353 struct nfs4_sequence_data {
7354         struct nfs_client *clp;
7355         struct nfs4_sequence_args args;
7356         struct nfs4_sequence_res res;
7357 };
7358
7359 static void nfs41_sequence_release(void *data)
7360 {
7361         struct nfs4_sequence_data *calldata = data;
7362         struct nfs_client *clp = calldata->clp;
7363
7364         if (atomic_read(&clp->cl_count) > 1)
7365                 nfs4_schedule_state_renewal(clp);
7366         nfs_put_client(clp);
7367         kfree(calldata);
7368 }
7369
7370 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7371 {
7372         switch(task->tk_status) {
7373         case -NFS4ERR_DELAY:
7374                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7375                 return -EAGAIN;
7376         default:
7377                 nfs4_schedule_lease_recovery(clp);
7378         }
7379         return 0;
7380 }
7381
7382 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7383 {
7384         struct nfs4_sequence_data *calldata = data;
7385         struct nfs_client *clp = calldata->clp;
7386
7387         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7388                 return;
7389
7390         trace_nfs4_sequence(clp, task->tk_status);
7391         if (task->tk_status < 0) {
7392                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7393                 if (atomic_read(&clp->cl_count) == 1)
7394                         goto out;
7395
7396                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7397                         rpc_restart_call_prepare(task);
7398                         return;
7399                 }
7400         }
7401         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7402 out:
7403         dprintk("<-- %s\n", __func__);
7404 }
7405
7406 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7407 {
7408         struct nfs4_sequence_data *calldata = data;
7409         struct nfs_client *clp = calldata->clp;
7410         struct nfs4_sequence_args *args;
7411         struct nfs4_sequence_res *res;
7412
7413         args = task->tk_msg.rpc_argp;
7414         res = task->tk_msg.rpc_resp;
7415
7416         nfs41_setup_sequence(clp->cl_session, args, res, task);
7417 }
7418
7419 static const struct rpc_call_ops nfs41_sequence_ops = {
7420         .rpc_call_done = nfs41_sequence_call_done,
7421         .rpc_call_prepare = nfs41_sequence_prepare,
7422         .rpc_release = nfs41_sequence_release,
7423 };
7424
7425 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7426                 struct rpc_cred *cred,
7427                 bool is_privileged)
7428 {
7429         struct nfs4_sequence_data *calldata;
7430         struct rpc_message msg = {
7431                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7432                 .rpc_cred = cred,
7433         };
7434         struct rpc_task_setup task_setup_data = {
7435                 .rpc_client = clp->cl_rpcclient,
7436                 .rpc_message = &msg,
7437                 .callback_ops = &nfs41_sequence_ops,
7438                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7439         };
7440
7441         if (!atomic_inc_not_zero(&clp->cl_count))
7442                 return ERR_PTR(-EIO);
7443         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7444         if (calldata == NULL) {
7445                 nfs_put_client(clp);
7446                 return ERR_PTR(-ENOMEM);
7447         }
7448         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7449         if (is_privileged)
7450                 nfs4_set_sequence_privileged(&calldata->args);
7451         msg.rpc_argp = &calldata->args;
7452         msg.rpc_resp = &calldata->res;
7453         calldata->clp = clp;
7454         task_setup_data.callback_data = calldata;
7455
7456         return rpc_run_task(&task_setup_data);
7457 }
7458
7459 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7460 {
7461         struct rpc_task *task;
7462         int ret = 0;
7463
7464         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7465                 return -EAGAIN;
7466         task = _nfs41_proc_sequence(clp, cred, false);
7467         if (IS_ERR(task))
7468                 ret = PTR_ERR(task);
7469         else
7470                 rpc_put_task_async(task);
7471         dprintk("<-- %s status=%d\n", __func__, ret);
7472         return ret;
7473 }
7474
7475 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7476 {
7477         struct rpc_task *task;
7478         int ret;
7479
7480         task = _nfs41_proc_sequence(clp, cred, true);
7481         if (IS_ERR(task)) {
7482                 ret = PTR_ERR(task);
7483                 goto out;
7484         }
7485         ret = rpc_wait_for_completion_task(task);
7486         if (!ret) {
7487                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7488
7489                 if (task->tk_status == 0)
7490                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7491                 ret = task->tk_status;
7492         }
7493         rpc_put_task(task);
7494 out:
7495         dprintk("<-- %s status=%d\n", __func__, ret);
7496         return ret;
7497 }
7498
7499 struct nfs4_reclaim_complete_data {
7500         struct nfs_client *clp;
7501         struct nfs41_reclaim_complete_args arg;
7502         struct nfs41_reclaim_complete_res res;
7503 };
7504
7505 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7506 {
7507         struct nfs4_reclaim_complete_data *calldata = data;
7508
7509         nfs41_setup_sequence(calldata->clp->cl_session,
7510                         &calldata->arg.seq_args,
7511                         &calldata->res.seq_res,
7512                         task);
7513 }
7514
7515 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7516 {
7517         switch(task->tk_status) {
7518         case 0:
7519         case -NFS4ERR_COMPLETE_ALREADY:
7520         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7521                 break;
7522         case -NFS4ERR_DELAY:
7523                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7524                 /* fall through */
7525         case -NFS4ERR_RETRY_UNCACHED_REP:
7526                 return -EAGAIN;
7527         default:
7528                 nfs4_schedule_lease_recovery(clp);
7529         }
7530         return 0;
7531 }
7532
7533 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7534 {
7535         struct nfs4_reclaim_complete_data *calldata = data;
7536         struct nfs_client *clp = calldata->clp;
7537         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7538
7539         dprintk("--> %s\n", __func__);
7540         if (!nfs41_sequence_done(task, res))
7541                 return;
7542
7543         trace_nfs4_reclaim_complete(clp, task->tk_status);
7544         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7545                 rpc_restart_call_prepare(task);
7546                 return;
7547         }
7548         dprintk("<-- %s\n", __func__);
7549 }
7550
7551 static void nfs4_free_reclaim_complete_data(void *data)
7552 {
7553         struct nfs4_reclaim_complete_data *calldata = data;
7554
7555         kfree(calldata);
7556 }
7557
7558 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7559         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7560         .rpc_call_done = nfs4_reclaim_complete_done,
7561         .rpc_release = nfs4_free_reclaim_complete_data,
7562 };
7563
7564 /*
7565  * Issue a global reclaim complete.
7566  */
7567 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7568                 struct rpc_cred *cred)
7569 {
7570         struct nfs4_reclaim_complete_data *calldata;
7571         struct rpc_task *task;
7572         struct rpc_message msg = {
7573                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7574                 .rpc_cred = cred,
7575         };
7576         struct rpc_task_setup task_setup_data = {
7577                 .rpc_client = clp->cl_rpcclient,
7578                 .rpc_message = &msg,
7579                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7580                 .flags = RPC_TASK_ASYNC,
7581         };
7582         int status = -ENOMEM;
7583
7584         dprintk("--> %s\n", __func__);
7585         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7586         if (calldata == NULL)
7587                 goto out;
7588         calldata->clp = clp;
7589         calldata->arg.one_fs = 0;
7590
7591         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7592         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7593         msg.rpc_argp = &calldata->arg;
7594         msg.rpc_resp = &calldata->res;
7595         task_setup_data.callback_data = calldata;
7596         task = rpc_run_task(&task_setup_data);
7597         if (IS_ERR(task)) {
7598                 status = PTR_ERR(task);
7599                 goto out;
7600         }
7601         status = nfs4_wait_for_completion_rpc_task(task);
7602         if (status == 0)
7603                 status = task->tk_status;
7604         rpc_put_task(task);
7605         return 0;
7606 out:
7607         dprintk("<-- %s status=%d\n", __func__, status);
7608         return status;
7609 }
7610
7611 static void
7612 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7613 {
7614         struct nfs4_layoutget *lgp = calldata;
7615         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7616         struct nfs4_session *session = nfs4_get_session(server);
7617
7618         dprintk("--> %s\n", __func__);
7619         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7620          * right now covering the LAYOUTGET we are about to send.
7621          * However, that is not so catastrophic, and there seems
7622          * to be no way to prevent it completely.
7623          */
7624         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7625                                 &lgp->res.seq_res, task))
7626                 return;
7627         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7628                                           NFS_I(lgp->args.inode)->layout,
7629                                           &lgp->args.range,
7630                                           lgp->args.ctx->state)) {
7631                 rpc_exit(task, NFS4_OK);
7632         }
7633 }
7634
7635 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7636 {
7637         struct nfs4_layoutget *lgp = calldata;
7638         struct inode *inode = lgp->args.inode;
7639         struct nfs_server *server = NFS_SERVER(inode);
7640         struct pnfs_layout_hdr *lo;
7641         struct nfs4_state *state = NULL;
7642         unsigned long timeo, now, giveup;
7643
7644         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7645
7646         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7647                 goto out;
7648
7649         switch (task->tk_status) {
7650         case 0:
7651                 goto out;
7652         /*
7653          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7654          * (or clients) writing to the same RAID stripe
7655          */
7656         case -NFS4ERR_LAYOUTTRYLATER:
7657         /*
7658          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7659          * existing layout before getting a new one).
7660          */
7661         case -NFS4ERR_RECALLCONFLICT:
7662                 timeo = rpc_get_timeout(task->tk_client);
7663                 giveup = lgp->args.timestamp + timeo;
7664                 now = jiffies;
7665                 if (time_after(giveup, now)) {
7666                         unsigned long delay;
7667
7668                         /* Delay for:
7669                          * - Not less then NFS4_POLL_RETRY_MIN.
7670                          * - One last time a jiffie before we give up
7671                          * - exponential backoff (time_now minus start_attempt)
7672                          */
7673                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7674                                     min((giveup - now - 1),
7675                                         now - lgp->args.timestamp));
7676
7677                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7678                                 __func__, delay);
7679                         rpc_delay(task, delay);
7680                         task->tk_status = 0;
7681                         rpc_restart_call_prepare(task);
7682                         goto out; /* Do not call nfs4_async_handle_error() */
7683                 }
7684                 break;
7685         case -NFS4ERR_EXPIRED:
7686         case -NFS4ERR_BAD_STATEID:
7687                 spin_lock(&inode->i_lock);
7688                 lo = NFS_I(inode)->layout;
7689                 if (!lo || list_empty(&lo->plh_segs)) {
7690                         spin_unlock(&inode->i_lock);
7691                         /* If the open stateid was bad, then recover it. */
7692                         state = lgp->args.ctx->state;
7693                 } else {
7694                         LIST_HEAD(head);
7695
7696                         /*
7697                          * Mark the bad layout state as invalid, then retry
7698                          * with the current stateid.
7699                          */
7700                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7701                         spin_unlock(&inode->i_lock);
7702                         pnfs_free_lseg_list(&head);
7703
7704                         task->tk_status = 0;
7705                         rpc_restart_call_prepare(task);
7706                 }
7707         }
7708         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7709                 rpc_restart_call_prepare(task);
7710 out:
7711         dprintk("<-- %s\n", __func__);
7712 }
7713
7714 static size_t max_response_pages(struct nfs_server *server)
7715 {
7716         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7717         return nfs_page_array_len(0, max_resp_sz);
7718 }
7719
7720 static void nfs4_free_pages(struct page **pages, size_t size)
7721 {
7722         int i;
7723
7724         if (!pages)
7725                 return;
7726
7727         for (i = 0; i < size; i++) {
7728                 if (!pages[i])
7729                         break;
7730                 __free_page(pages[i]);
7731         }
7732         kfree(pages);
7733 }
7734
7735 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7736 {
7737         struct page **pages;
7738         int i;
7739
7740         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7741         if (!pages) {
7742                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7743                 return NULL;
7744         }
7745
7746         for (i = 0; i < size; i++) {
7747                 pages[i] = alloc_page(gfp_flags);
7748                 if (!pages[i]) {
7749                         dprintk("%s: failed to allocate page\n", __func__);
7750                         nfs4_free_pages(pages, size);
7751                         return NULL;
7752                 }
7753         }
7754
7755         return pages;
7756 }
7757
7758 static void nfs4_layoutget_release(void *calldata)
7759 {
7760         struct nfs4_layoutget *lgp = calldata;
7761         struct inode *inode = lgp->args.inode;
7762         struct nfs_server *server = NFS_SERVER(inode);
7763         size_t max_pages = max_response_pages(server);
7764
7765         dprintk("--> %s\n", __func__);
7766         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7767         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7768         put_nfs_open_context(lgp->args.ctx);
7769         kfree(calldata);
7770         dprintk("<-- %s\n", __func__);
7771 }
7772
7773 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7774         .rpc_call_prepare = nfs4_layoutget_prepare,
7775         .rpc_call_done = nfs4_layoutget_done,
7776         .rpc_release = nfs4_layoutget_release,
7777 };
7778
7779 struct pnfs_layout_segment *
7780 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7781 {
7782         struct inode *inode = lgp->args.inode;
7783         struct nfs_server *server = NFS_SERVER(inode);
7784         size_t max_pages = max_response_pages(server);
7785         struct rpc_task *task;
7786         struct rpc_message msg = {
7787                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7788                 .rpc_argp = &lgp->args,
7789                 .rpc_resp = &lgp->res,
7790                 .rpc_cred = lgp->cred,
7791         };
7792         struct rpc_task_setup task_setup_data = {
7793                 .rpc_client = server->client,
7794                 .rpc_message = &msg,
7795                 .callback_ops = &nfs4_layoutget_call_ops,
7796                 .callback_data = lgp,
7797                 .flags = RPC_TASK_ASYNC,
7798         };
7799         struct pnfs_layout_segment *lseg = NULL;
7800         int status = 0;
7801
7802         dprintk("--> %s\n", __func__);
7803
7804         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7805         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7806
7807         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7808         if (!lgp->args.layout.pages) {
7809                 nfs4_layoutget_release(lgp);
7810                 return ERR_PTR(-ENOMEM);
7811         }
7812         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7813         lgp->args.timestamp = jiffies;
7814
7815         lgp->res.layoutp = &lgp->args.layout;
7816         lgp->res.seq_res.sr_slot = NULL;
7817         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7818
7819         task = rpc_run_task(&task_setup_data);
7820         if (IS_ERR(task))
7821                 return ERR_CAST(task);
7822         status = nfs4_wait_for_completion_rpc_task(task);
7823         if (status == 0)
7824                 status = task->tk_status;
7825         trace_nfs4_layoutget(lgp->args.ctx,
7826                         &lgp->args.range,
7827                         &lgp->res.range,
7828                         status);
7829         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7830         if (status == 0 && lgp->res.layoutp->len)
7831                 lseg = pnfs_layout_process(lgp);
7832         rpc_put_task(task);
7833         dprintk("<-- %s status=%d\n", __func__, status);
7834         if (status)
7835                 return ERR_PTR(status);
7836         return lseg;
7837 }
7838
7839 static void
7840 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7841 {
7842         struct nfs4_layoutreturn *lrp = calldata;
7843
7844         dprintk("--> %s\n", __func__);
7845         nfs41_setup_sequence(lrp->clp->cl_session,
7846                         &lrp->args.seq_args,
7847                         &lrp->res.seq_res,
7848                         task);
7849 }
7850
7851 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7852 {
7853         struct nfs4_layoutreturn *lrp = calldata;
7854         struct nfs_server *server;
7855
7856         dprintk("--> %s\n", __func__);
7857
7858         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7859                 return;
7860
7861         server = NFS_SERVER(lrp->args.inode);
7862         switch (task->tk_status) {
7863         default:
7864                 task->tk_status = 0;
7865         case 0:
7866                 break;
7867         case -NFS4ERR_DELAY:
7868                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7869                         break;
7870                 rpc_restart_call_prepare(task);
7871                 return;
7872         }
7873         dprintk("<-- %s\n", __func__);
7874 }
7875
7876 static void nfs4_layoutreturn_release(void *calldata)
7877 {
7878         struct nfs4_layoutreturn *lrp = calldata;
7879         struct pnfs_layout_hdr *lo = lrp->args.layout;
7880
7881         dprintk("--> %s\n", __func__);
7882         spin_lock(&lo->plh_inode->i_lock);
7883         if (lrp->res.lrs_present)
7884                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7885         pnfs_clear_layoutreturn_waitbit(lo);
7886         clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
7887         rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
7888         lo->plh_block_lgets--;
7889         spin_unlock(&lo->plh_inode->i_lock);
7890         pnfs_put_layout_hdr(lrp->args.layout);
7891         nfs_iput_and_deactive(lrp->inode);
7892         kfree(calldata);
7893         dprintk("<-- %s\n", __func__);
7894 }
7895
7896 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7897         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7898         .rpc_call_done = nfs4_layoutreturn_done,
7899         .rpc_release = nfs4_layoutreturn_release,
7900 };
7901
7902 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
7903 {
7904         struct rpc_task *task;
7905         struct rpc_message msg = {
7906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7907                 .rpc_argp = &lrp->args,
7908                 .rpc_resp = &lrp->res,
7909                 .rpc_cred = lrp->cred,
7910         };
7911         struct rpc_task_setup task_setup_data = {
7912                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7913                 .rpc_message = &msg,
7914                 .callback_ops = &nfs4_layoutreturn_call_ops,
7915                 .callback_data = lrp,
7916         };
7917         int status = 0;
7918
7919         dprintk("--> %s\n", __func__);
7920         if (!sync) {
7921                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
7922                 if (!lrp->inode) {
7923                         nfs4_layoutreturn_release(lrp);
7924                         return -EAGAIN;
7925                 }
7926                 task_setup_data.flags |= RPC_TASK_ASYNC;
7927         }
7928         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7929         task = rpc_run_task(&task_setup_data);
7930         if (IS_ERR(task))
7931                 return PTR_ERR(task);
7932         if (sync)
7933                 status = task->tk_status;
7934         trace_nfs4_layoutreturn(lrp->args.inode, status);
7935         dprintk("<-- %s status=%d\n", __func__, status);
7936         rpc_put_task(task);
7937         return status;
7938 }
7939
7940 static int
7941 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7942                 struct pnfs_device *pdev,
7943                 struct rpc_cred *cred)
7944 {
7945         struct nfs4_getdeviceinfo_args args = {
7946                 .pdev = pdev,
7947         };
7948         struct nfs4_getdeviceinfo_res res = {
7949                 .pdev = pdev,
7950         };
7951         struct rpc_message msg = {
7952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7953                 .rpc_argp = &args,
7954                 .rpc_resp = &res,
7955                 .rpc_cred = cred,
7956         };
7957         int status;
7958
7959         dprintk("--> %s\n", __func__);
7960         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7961         dprintk("<-- %s status=%d\n", __func__, status);
7962
7963         return status;
7964 }
7965
7966 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7967                 struct pnfs_device *pdev,
7968                 struct rpc_cred *cred)
7969 {
7970         struct nfs4_exception exception = { };
7971         int err;
7972
7973         do {
7974                 err = nfs4_handle_exception(server,
7975                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7976                                         &exception);
7977         } while (exception.retry);
7978         return err;
7979 }
7980 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7981
7982 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7983 {
7984         struct nfs4_layoutcommit_data *data = calldata;
7985         struct nfs_server *server = NFS_SERVER(data->args.inode);
7986         struct nfs4_session *session = nfs4_get_session(server);
7987
7988         nfs41_setup_sequence(session,
7989                         &data->args.seq_args,
7990                         &data->res.seq_res,
7991                         task);
7992 }
7993
7994 static void
7995 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7996 {
7997         struct nfs4_layoutcommit_data *data = calldata;
7998         struct nfs_server *server = NFS_SERVER(data->args.inode);
7999
8000         if (!nfs41_sequence_done(task, &data->res.seq_res))
8001                 return;
8002
8003         switch (task->tk_status) { /* Just ignore these failures */
8004         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8005         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8006         case -NFS4ERR_BADLAYOUT:     /* no layout */
8007         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8008                 task->tk_status = 0;
8009         case 0:
8010                 break;
8011         default:
8012                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8013                         rpc_restart_call_prepare(task);
8014                         return;
8015                 }
8016         }
8017 }
8018
8019 static void nfs4_layoutcommit_release(void *calldata)
8020 {
8021         struct nfs4_layoutcommit_data *data = calldata;
8022
8023         pnfs_cleanup_layoutcommit(data);
8024         nfs_post_op_update_inode_force_wcc(data->args.inode,
8025                                            data->res.fattr);
8026         put_rpccred(data->cred);
8027         nfs_iput_and_deactive(data->inode);
8028         kfree(data);
8029 }
8030
8031 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8032         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8033         .rpc_call_done = nfs4_layoutcommit_done,
8034         .rpc_release = nfs4_layoutcommit_release,
8035 };
8036
8037 int
8038 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8039 {
8040         struct rpc_message msg = {
8041                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8042                 .rpc_argp = &data->args,
8043                 .rpc_resp = &data->res,
8044                 .rpc_cred = data->cred,
8045         };
8046         struct rpc_task_setup task_setup_data = {
8047                 .task = &data->task,
8048                 .rpc_client = NFS_CLIENT(data->args.inode),
8049                 .rpc_message = &msg,
8050                 .callback_ops = &nfs4_layoutcommit_ops,
8051                 .callback_data = data,
8052         };
8053         struct rpc_task *task;
8054         int status = 0;
8055
8056         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
8057                 "lbw: %llu inode %lu\n",
8058                 data->task.tk_pid, sync,
8059                 data->args.lastbytewritten,
8060                 data->args.inode->i_ino);
8061
8062         if (!sync) {
8063                 data->inode = nfs_igrab_and_active(data->args.inode);
8064                 if (data->inode == NULL) {
8065                         nfs4_layoutcommit_release(data);
8066                         return -EAGAIN;
8067                 }
8068                 task_setup_data.flags = RPC_TASK_ASYNC;
8069         }
8070         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8071         task = rpc_run_task(&task_setup_data);
8072         if (IS_ERR(task))
8073                 return PTR_ERR(task);
8074         if (sync)
8075                 status = task->tk_status;
8076         trace_nfs4_layoutcommit(data->args.inode, status);
8077         dprintk("%s: status %d\n", __func__, status);
8078         rpc_put_task(task);
8079         return status;
8080 }
8081
8082 /**
8083  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8084  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8085  */
8086 static int
8087 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8088                     struct nfs_fsinfo *info,
8089                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8090 {
8091         struct nfs41_secinfo_no_name_args args = {
8092                 .style = SECINFO_STYLE_CURRENT_FH,
8093         };
8094         struct nfs4_secinfo_res res = {
8095                 .flavors = flavors,
8096         };
8097         struct rpc_message msg = {
8098                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8099                 .rpc_argp = &args,
8100                 .rpc_resp = &res,
8101         };
8102         struct rpc_clnt *clnt = server->client;
8103         struct rpc_cred *cred = NULL;
8104         int status;
8105
8106         if (use_integrity) {
8107                 clnt = server->nfs_client->cl_rpcclient;
8108                 cred = nfs4_get_clid_cred(server->nfs_client);
8109                 msg.rpc_cred = cred;
8110         }
8111
8112         dprintk("--> %s\n", __func__);
8113         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8114                                 &res.seq_res, 0);
8115         dprintk("<-- %s status=%d\n", __func__, status);
8116
8117         if (cred)
8118                 put_rpccred(cred);
8119
8120         return status;
8121 }
8122
8123 static int
8124 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8125                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8126 {
8127         struct nfs4_exception exception = { };
8128         int err;
8129         do {
8130                 /* first try using integrity protection */
8131                 err = -NFS4ERR_WRONGSEC;
8132
8133                 /* try to use integrity protection with machine cred */
8134                 if (_nfs4_is_integrity_protected(server->nfs_client))
8135                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8136                                                           flavors, true);
8137
8138                 /*
8139                  * if unable to use integrity protection, or SECINFO with
8140                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8141                  * disallowed by spec, but exists in deployed servers) use
8142                  * the current filesystem's rpc_client and the user cred.
8143                  */
8144                 if (err == -NFS4ERR_WRONGSEC)
8145                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8146                                                           flavors, false);
8147
8148                 switch (err) {
8149                 case 0:
8150                 case -NFS4ERR_WRONGSEC:
8151                 case -ENOTSUPP:
8152                         goto out;
8153                 default:
8154                         err = nfs4_handle_exception(server, err, &exception);
8155                 }
8156         } while (exception.retry);
8157 out:
8158         return err;
8159 }
8160
8161 static int
8162 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8163                     struct nfs_fsinfo *info)
8164 {
8165         int err;
8166         struct page *page;
8167         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8168         struct nfs4_secinfo_flavors *flavors;
8169         struct nfs4_secinfo4 *secinfo;
8170         int i;
8171
8172         page = alloc_page(GFP_KERNEL);
8173         if (!page) {
8174                 err = -ENOMEM;
8175                 goto out;
8176         }
8177
8178         flavors = page_address(page);
8179         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8180
8181         /*
8182          * Fall back on "guess and check" method if
8183          * the server doesn't support SECINFO_NO_NAME
8184          */
8185         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8186                 err = nfs4_find_root_sec(server, fhandle, info);
8187                 goto out_freepage;
8188         }
8189         if (err)
8190                 goto out_freepage;
8191
8192         for (i = 0; i < flavors->num_flavors; i++) {
8193                 secinfo = &flavors->flavors[i];
8194
8195                 switch (secinfo->flavor) {
8196                 case RPC_AUTH_NULL:
8197                 case RPC_AUTH_UNIX:
8198                 case RPC_AUTH_GSS:
8199                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8200                                         &secinfo->flavor_info);
8201                         break;
8202                 default:
8203                         flavor = RPC_AUTH_MAXFLAVOR;
8204                         break;
8205                 }
8206
8207                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8208                         flavor = RPC_AUTH_MAXFLAVOR;
8209
8210                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8211                         err = nfs4_lookup_root_sec(server, fhandle,
8212                                                    info, flavor);
8213                         if (!err)
8214                                 break;
8215                 }
8216         }
8217
8218         if (flavor == RPC_AUTH_MAXFLAVOR)
8219                 err = -EPERM;
8220
8221 out_freepage:
8222         put_page(page);
8223         if (err == -EACCES)
8224                 return -EPERM;
8225 out:
8226         return err;
8227 }
8228
8229 static int _nfs41_test_stateid(struct nfs_server *server,
8230                 nfs4_stateid *stateid,
8231                 struct rpc_cred *cred)
8232 {
8233         int status;
8234         struct nfs41_test_stateid_args args = {
8235                 .stateid = stateid,
8236         };
8237         struct nfs41_test_stateid_res res;
8238         struct rpc_message msg = {
8239                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8240                 .rpc_argp = &args,
8241                 .rpc_resp = &res,
8242                 .rpc_cred = cred,
8243         };
8244         struct rpc_clnt *rpc_client = server->client;
8245
8246         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8247                 &rpc_client, &msg);
8248
8249         dprintk("NFS call  test_stateid %p\n", stateid);
8250         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8251         nfs4_set_sequence_privileged(&args.seq_args);
8252         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8253                         &args.seq_args, &res.seq_res);
8254         if (status != NFS_OK) {
8255                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8256                 return status;
8257         }
8258         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8259         return -res.status;
8260 }
8261
8262 /**
8263  * nfs41_test_stateid - perform a TEST_STATEID operation
8264  *
8265  * @server: server / transport on which to perform the operation
8266  * @stateid: state ID to test
8267  * @cred: credential
8268  *
8269  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8270  * Otherwise a negative NFS4ERR value is returned if the operation
8271  * failed or the state ID is not currently valid.
8272  */
8273 static int nfs41_test_stateid(struct nfs_server *server,
8274                 nfs4_stateid *stateid,
8275                 struct rpc_cred *cred)
8276 {
8277         struct nfs4_exception exception = { };
8278         int err;
8279         do {
8280                 err = _nfs41_test_stateid(server, stateid, cred);
8281                 if (err != -NFS4ERR_DELAY)
8282                         break;
8283                 nfs4_handle_exception(server, err, &exception);
8284         } while (exception.retry);
8285         return err;
8286 }
8287
8288 struct nfs_free_stateid_data {
8289         struct nfs_server *server;
8290         struct nfs41_free_stateid_args args;
8291         struct nfs41_free_stateid_res res;
8292 };
8293
8294 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8295 {
8296         struct nfs_free_stateid_data *data = calldata;
8297         nfs41_setup_sequence(nfs4_get_session(data->server),
8298                         &data->args.seq_args,
8299                         &data->res.seq_res,
8300                         task);
8301 }
8302
8303 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8304 {
8305         struct nfs_free_stateid_data *data = calldata;
8306
8307         nfs41_sequence_done(task, &data->res.seq_res);
8308
8309         switch (task->tk_status) {
8310         case -NFS4ERR_DELAY:
8311                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8312                         rpc_restart_call_prepare(task);
8313         }
8314 }
8315
8316 static void nfs41_free_stateid_release(void *calldata)
8317 {
8318         kfree(calldata);
8319 }
8320
8321 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8322         .rpc_call_prepare = nfs41_free_stateid_prepare,
8323         .rpc_call_done = nfs41_free_stateid_done,
8324         .rpc_release = nfs41_free_stateid_release,
8325 };
8326
8327 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8328                 nfs4_stateid *stateid,
8329                 struct rpc_cred *cred,
8330                 bool privileged)
8331 {
8332         struct rpc_message msg = {
8333                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8334                 .rpc_cred = cred,
8335         };
8336         struct rpc_task_setup task_setup = {
8337                 .rpc_client = server->client,
8338                 .rpc_message = &msg,
8339                 .callback_ops = &nfs41_free_stateid_ops,
8340                 .flags = RPC_TASK_ASYNC,
8341         };
8342         struct nfs_free_stateid_data *data;
8343
8344         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8345                 &task_setup.rpc_client, &msg);
8346
8347         dprintk("NFS call  free_stateid %p\n", stateid);
8348         data = kmalloc(sizeof(*data), GFP_NOFS);
8349         if (!data)
8350                 return ERR_PTR(-ENOMEM);
8351         data->server = server;
8352         nfs4_stateid_copy(&data->args.stateid, stateid);
8353
8354         task_setup.callback_data = data;
8355
8356         msg.rpc_argp = &data->args;
8357         msg.rpc_resp = &data->res;
8358         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8359         if (privileged)
8360                 nfs4_set_sequence_privileged(&data->args.seq_args);
8361
8362         return rpc_run_task(&task_setup);
8363 }
8364
8365 /**
8366  * nfs41_free_stateid - perform a FREE_STATEID operation
8367  *
8368  * @server: server / transport on which to perform the operation
8369  * @stateid: state ID to release
8370  * @cred: credential
8371  *
8372  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8373  * negative NFS4ERR value is returned.
8374  */
8375 static int nfs41_free_stateid(struct nfs_server *server,
8376                 nfs4_stateid *stateid,
8377                 struct rpc_cred *cred)
8378 {
8379         struct rpc_task *task;
8380         int ret;
8381
8382         task = _nfs41_free_stateid(server, stateid, cred, true);
8383         if (IS_ERR(task))
8384                 return PTR_ERR(task);
8385         ret = rpc_wait_for_completion_task(task);
8386         if (!ret)
8387                 ret = task->tk_status;
8388         rpc_put_task(task);
8389         return ret;
8390 }
8391
8392 static void
8393 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8394 {
8395         struct rpc_task *task;
8396         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8397
8398         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8399         nfs4_free_lock_state(server, lsp);
8400         if (IS_ERR(task))
8401                 return;
8402         rpc_put_task(task);
8403 }
8404
8405 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8406                 const nfs4_stateid *s2)
8407 {
8408         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8409                 return false;
8410
8411         if (s1->seqid == s2->seqid)
8412                 return true;
8413         if (s1->seqid == 0 || s2->seqid == 0)
8414                 return true;
8415
8416         return false;
8417 }
8418
8419 #endif /* CONFIG_NFS_V4_1 */
8420
8421 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8422                 const nfs4_stateid *s2)
8423 {
8424         return nfs4_stateid_match(s1, s2);
8425 }
8426
8427
8428 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8429         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8430         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8431         .recover_open   = nfs4_open_reclaim,
8432         .recover_lock   = nfs4_lock_reclaim,
8433         .establish_clid = nfs4_init_clientid,
8434         .detect_trunking = nfs40_discover_server_trunking,
8435 };
8436
8437 #if defined(CONFIG_NFS_V4_1)
8438 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8439         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8440         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8441         .recover_open   = nfs4_open_reclaim,
8442         .recover_lock   = nfs4_lock_reclaim,
8443         .establish_clid = nfs41_init_clientid,
8444         .reclaim_complete = nfs41_proc_reclaim_complete,
8445         .detect_trunking = nfs41_discover_server_trunking,
8446 };
8447 #endif /* CONFIG_NFS_V4_1 */
8448
8449 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8450         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8451         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8452         .recover_open   = nfs40_open_expired,
8453         .recover_lock   = nfs4_lock_expired,
8454         .establish_clid = nfs4_init_clientid,
8455 };
8456
8457 #if defined(CONFIG_NFS_V4_1)
8458 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8459         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8460         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8461         .recover_open   = nfs41_open_expired,
8462         .recover_lock   = nfs41_lock_expired,
8463         .establish_clid = nfs41_init_clientid,
8464 };
8465 #endif /* CONFIG_NFS_V4_1 */
8466
8467 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8468         .sched_state_renewal = nfs4_proc_async_renew,
8469         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8470         .renew_lease = nfs4_proc_renew,
8471 };
8472
8473 #if defined(CONFIG_NFS_V4_1)
8474 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8475         .sched_state_renewal = nfs41_proc_async_sequence,
8476         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8477         .renew_lease = nfs4_proc_sequence,
8478 };
8479 #endif
8480
8481 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8482         .get_locations = _nfs40_proc_get_locations,
8483         .fsid_present = _nfs40_proc_fsid_present,
8484 };
8485
8486 #if defined(CONFIG_NFS_V4_1)
8487 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8488         .get_locations = _nfs41_proc_get_locations,
8489         .fsid_present = _nfs41_proc_fsid_present,
8490 };
8491 #endif  /* CONFIG_NFS_V4_1 */
8492
8493 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8494         .minor_version = 0,
8495         .init_caps = NFS_CAP_READDIRPLUS
8496                 | NFS_CAP_ATOMIC_OPEN
8497                 | NFS_CAP_CHANGE_ATTR
8498                 | NFS_CAP_POSIX_LOCK,
8499         .init_client = nfs40_init_client,
8500         .shutdown_client = nfs40_shutdown_client,
8501         .match_stateid = nfs4_match_stateid,
8502         .find_root_sec = nfs4_find_root_sec,
8503         .free_lock_state = nfs4_release_lockowner,
8504         .alloc_seqid = nfs_alloc_seqid,
8505         .call_sync_ops = &nfs40_call_sync_ops,
8506         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8507         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8508         .state_renewal_ops = &nfs40_state_renewal_ops,
8509         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8510 };
8511
8512 #if defined(CONFIG_NFS_V4_1)
8513 static struct nfs_seqid *
8514 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8515 {
8516         return NULL;
8517 }
8518
8519 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8520         .minor_version = 1,
8521         .init_caps = NFS_CAP_READDIRPLUS
8522                 | NFS_CAP_ATOMIC_OPEN
8523                 | NFS_CAP_CHANGE_ATTR
8524                 | NFS_CAP_POSIX_LOCK
8525                 | NFS_CAP_STATEID_NFSV41
8526                 | NFS_CAP_ATOMIC_OPEN_V1,
8527         .init_client = nfs41_init_client,
8528         .shutdown_client = nfs41_shutdown_client,
8529         .match_stateid = nfs41_match_stateid,
8530         .find_root_sec = nfs41_find_root_sec,
8531         .free_lock_state = nfs41_free_lock_state,
8532         .alloc_seqid = nfs_alloc_no_seqid,
8533         .call_sync_ops = &nfs41_call_sync_ops,
8534         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8535         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8536         .state_renewal_ops = &nfs41_state_renewal_ops,
8537         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8538 };
8539 #endif
8540
8541 #if defined(CONFIG_NFS_V4_2)
8542 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8543         .minor_version = 2,
8544         .init_caps = NFS_CAP_READDIRPLUS
8545                 | NFS_CAP_ATOMIC_OPEN
8546                 | NFS_CAP_CHANGE_ATTR
8547                 | NFS_CAP_POSIX_LOCK
8548                 | NFS_CAP_STATEID_NFSV41
8549                 | NFS_CAP_ATOMIC_OPEN_V1
8550                 | NFS_CAP_ALLOCATE
8551                 | NFS_CAP_DEALLOCATE
8552                 | NFS_CAP_SEEK,
8553         .init_client = nfs41_init_client,
8554         .shutdown_client = nfs41_shutdown_client,
8555         .match_stateid = nfs41_match_stateid,
8556         .find_root_sec = nfs41_find_root_sec,
8557         .free_lock_state = nfs41_free_lock_state,
8558         .call_sync_ops = &nfs41_call_sync_ops,
8559         .alloc_seqid = nfs_alloc_no_seqid,
8560         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8561         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8562         .state_renewal_ops = &nfs41_state_renewal_ops,
8563 };
8564 #endif
8565
8566 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8567         [0] = &nfs_v4_0_minor_ops,
8568 #if defined(CONFIG_NFS_V4_1)
8569         [1] = &nfs_v4_1_minor_ops,
8570 #endif
8571 #if defined(CONFIG_NFS_V4_2)
8572         [2] = &nfs_v4_2_minor_ops,
8573 #endif
8574 };
8575
8576 static const struct inode_operations nfs4_dir_inode_operations = {
8577         .create         = nfs_create,
8578         .lookup         = nfs_lookup,
8579         .atomic_open    = nfs_atomic_open,
8580         .link           = nfs_link,
8581         .unlink         = nfs_unlink,
8582         .symlink        = nfs_symlink,
8583         .mkdir          = nfs_mkdir,
8584         .rmdir          = nfs_rmdir,
8585         .mknod          = nfs_mknod,
8586         .rename         = nfs_rename,
8587         .permission     = nfs_permission,
8588         .getattr        = nfs_getattr,
8589         .setattr        = nfs_setattr,
8590         .getxattr       = generic_getxattr,
8591         .setxattr       = generic_setxattr,
8592         .listxattr      = generic_listxattr,
8593         .removexattr    = generic_removexattr,
8594 };
8595
8596 static const struct inode_operations nfs4_file_inode_operations = {
8597         .permission     = nfs_permission,
8598         .getattr        = nfs_getattr,
8599         .setattr        = nfs_setattr,
8600         .getxattr       = generic_getxattr,
8601         .setxattr       = generic_setxattr,
8602         .listxattr      = generic_listxattr,
8603         .removexattr    = generic_removexattr,
8604 };
8605
8606 const struct nfs_rpc_ops nfs_v4_clientops = {
8607         .version        = 4,                    /* protocol version */
8608         .dentry_ops     = &nfs4_dentry_operations,
8609         .dir_inode_ops  = &nfs4_dir_inode_operations,
8610         .file_inode_ops = &nfs4_file_inode_operations,
8611         .file_ops       = &nfs4_file_operations,
8612         .getroot        = nfs4_proc_get_root,
8613         .submount       = nfs4_submount,
8614         .try_mount      = nfs4_try_mount,
8615         .getattr        = nfs4_proc_getattr,
8616         .setattr        = nfs4_proc_setattr,
8617         .lookup         = nfs4_proc_lookup,
8618         .access         = nfs4_proc_access,
8619         .readlink       = nfs4_proc_readlink,
8620         .create         = nfs4_proc_create,
8621         .remove         = nfs4_proc_remove,
8622         .unlink_setup   = nfs4_proc_unlink_setup,
8623         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8624         .unlink_done    = nfs4_proc_unlink_done,
8625         .rename_setup   = nfs4_proc_rename_setup,
8626         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8627         .rename_done    = nfs4_proc_rename_done,
8628         .link           = nfs4_proc_link,
8629         .symlink        = nfs4_proc_symlink,
8630         .mkdir          = nfs4_proc_mkdir,
8631         .rmdir          = nfs4_proc_remove,
8632         .readdir        = nfs4_proc_readdir,
8633         .mknod          = nfs4_proc_mknod,
8634         .statfs         = nfs4_proc_statfs,
8635         .fsinfo         = nfs4_proc_fsinfo,
8636         .pathconf       = nfs4_proc_pathconf,
8637         .set_capabilities = nfs4_server_capabilities,
8638         .decode_dirent  = nfs4_decode_dirent,
8639         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8640         .read_setup     = nfs4_proc_read_setup,
8641         .read_done      = nfs4_read_done,
8642         .write_setup    = nfs4_proc_write_setup,
8643         .write_done     = nfs4_write_done,
8644         .commit_setup   = nfs4_proc_commit_setup,
8645         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8646         .commit_done    = nfs4_commit_done,
8647         .lock           = nfs4_proc_lock,
8648         .clear_acl_cache = nfs4_zap_acl_attr,
8649         .close_context  = nfs4_close_context,
8650         .open_context   = nfs4_atomic_open,
8651         .have_delegation = nfs4_have_delegation,
8652         .return_delegation = nfs4_inode_return_delegation,
8653         .alloc_client   = nfs4_alloc_client,
8654         .init_client    = nfs4_init_client,
8655         .free_client    = nfs4_free_client,
8656         .create_server  = nfs4_create_server,
8657         .clone_server   = nfs_clone_server,
8658 };
8659
8660 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8661         .prefix = XATTR_NAME_NFSV4_ACL,
8662         .list   = nfs4_xattr_list_nfs4_acl,
8663         .get    = nfs4_xattr_get_nfs4_acl,
8664         .set    = nfs4_xattr_set_nfs4_acl,
8665 };
8666
8667 const struct xattr_handler *nfs4_xattr_handlers[] = {
8668         &nfs4_xattr_nfs4_acl_handler,
8669 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8670         &nfs4_xattr_nfs4_label_handler,
8671 #endif
8672         NULL
8673 };
8674
8675 /*
8676  * Local variables:
8677  *  c-basic-offset: 8
8678  * End:
8679  */