fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         if (NFS_SERVER(dir)->nfs_client->cl_minorversion < 2)
 109                 return NULL;
 110
 111         err = security_dentry_init_security(dentry, sattr->ia_mode,
 112                                 &dentry->d_name, (void **)&label->label, &label->len);
 113         if (err == 0)
 114                 return label;
 115
 116         return NULL;
 117 }
 118 static inline void
 119 nfs4_label_release_security(struct nfs4_label *label)
 120 {
 121         if (label)
 122                 security_release_secctx(label->label, label->len);
 123 }
 124 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 125 {
 126         if (label)
 127                 return server->attr_bitmask;
 128
 129         return server->attr_bitmask_nl;
 130 }
 131 #else
 132 static inline struct nfs4_label *
 133 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 134         struct iattr *sattr, struct nfs4_label *l)
 135 { return NULL; }
 136 static inline void
 137 nfs4_label_release_security(struct nfs4_label *label)
 138 { return; }
 139 static inline u32 *
 140 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 141 { return server->attr_bitmask; }
 142 #endif
 143
 144 /* Prevent leaks of NFSv4 errors into userland */
 145 static int nfs4_map_errors(int err)
 146 {
 147         if (err >= -1000)
 148                 return err;
 149         switch (err) {
 150         case -NFS4ERR_RESOURCE:
 151         case -NFS4ERR_LAYOUTTRYLATER:
 152         case -NFS4ERR_RECALLCONFLICT:
 153                 return -EREMOTEIO;
 154         case -NFS4ERR_WRONGSEC:
 155         case -NFS4ERR_WRONG_CRED:
 156                 return -EPERM;
 157         case -NFS4ERR_BADOWNER:
 158         case -NFS4ERR_BADNAME:
 159                 return -EINVAL;
 160         case -NFS4ERR_SHARE_DENIED:
 161                 return -EACCES;
 162         case -NFS4ERR_MINOR_VERS_MISMATCH:
 163                 return -EPROTONOSUPPORT;
 164         case -NFS4ERR_ACCESS:
 165                 return -EACCES;
 166         case -NFS4ERR_FILE_OPEN:
 167                 return -EBUSY;
 168         default:
 169                 dprintk("%s could not handle NFSv4 error %d\n",
 170                                 __func__, -err);
 171                 break;
 172         }
 173         return -EIO;
 174 }
 175
 176 /*
 177  * This is our standard bitmap for GETATTR requests.
 178  */
 179 const u32 nfs4_fattr_bitmap[3] = {
 180         FATTR4_WORD0_TYPE
 181         | FATTR4_WORD0_CHANGE
 182         | FATTR4_WORD0_SIZE
 183         | FATTR4_WORD0_FSID
 184         | FATTR4_WORD0_FILEID,
 185         FATTR4_WORD1_MODE
 186         | FATTR4_WORD1_NUMLINKS
 187         | FATTR4_WORD1_OWNER
 188         | FATTR4_WORD1_OWNER_GROUP
 189         | FATTR4_WORD1_RAWDEV
 190         | FATTR4_WORD1_SPACE_USED
 191         | FATTR4_WORD1_TIME_ACCESS
 192         | FATTR4_WORD1_TIME_METADATA
 193         | FATTR4_WORD1_TIME_MODIFY,
 194 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 195         FATTR4_WORD2_SECURITY_LABEL
 196 #endif
 197 };
 198
 199 static const u32 nfs4_pnfs_open_bitmap[3] = {
 200         FATTR4_WORD0_TYPE
 201         | FATTR4_WORD0_CHANGE
 202         | FATTR4_WORD0_SIZE
 203         | FATTR4_WORD0_FSID
 204         | FATTR4_WORD0_FILEID,
 205         FATTR4_WORD1_MODE
 206         | FATTR4_WORD1_NUMLINKS
 207         | FATTR4_WORD1_OWNER
 208         | FATTR4_WORD1_OWNER_GROUP
 209         | FATTR4_WORD1_RAWDEV
 210         | FATTR4_WORD1_SPACE_USED
 211         | FATTR4_WORD1_TIME_ACCESS
 212         | FATTR4_WORD1_TIME_METADATA
 213         | FATTR4_WORD1_TIME_MODIFY,
 214         FATTR4_WORD2_MDSTHRESHOLD
 215 };
 216
 217 static const u32 nfs4_open_noattr_bitmap[3] = {
 218         FATTR4_WORD0_TYPE
 219         | FATTR4_WORD0_CHANGE
 220         | FATTR4_WORD0_FILEID,
 221 };
 222
 223 const u32 nfs4_statfs_bitmap[3] = {
 224         FATTR4_WORD0_FILES_AVAIL
 225         | FATTR4_WORD0_FILES_FREE
 226         | FATTR4_WORD0_FILES_TOTAL,
 227         FATTR4_WORD1_SPACE_AVAIL
 228         | FATTR4_WORD1_SPACE_FREE
 229         | FATTR4_WORD1_SPACE_TOTAL
 230 };
 231
 232 const u32 nfs4_pathconf_bitmap[3] = {
 233         FATTR4_WORD0_MAXLINK
 234         | FATTR4_WORD0_MAXNAME,
 235         0
 236 };
 237
 238 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 239                         | FATTR4_WORD0_MAXREAD
 240                         | FATTR4_WORD0_MAXWRITE
 241                         | FATTR4_WORD0_LEASE_TIME,
 242                         FATTR4_WORD1_TIME_DELTA
 243                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 244                         FATTR4_WORD2_LAYOUT_BLKSIZE
 245 };
 246
 247 const u32 nfs4_fs_locations_bitmap[3] = {
 248         FATTR4_WORD0_TYPE
 249         | FATTR4_WORD0_CHANGE
 250         | FATTR4_WORD0_SIZE
 251         | FATTR4_WORD0_FSID
 252         | FATTR4_WORD0_FILEID
 253         | FATTR4_WORD0_FS_LOCATIONS,
 254         FATTR4_WORD1_MODE
 255         | FATTR4_WORD1_NUMLINKS
 256         | FATTR4_WORD1_OWNER
 257         | FATTR4_WORD1_OWNER_GROUP
 258         | FATTR4_WORD1_RAWDEV
 259         | FATTR4_WORD1_SPACE_USED
 260         | FATTR4_WORD1_TIME_ACCESS
 261         | FATTR4_WORD1_TIME_METADATA
 262         | FATTR4_WORD1_TIME_MODIFY
 263         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 264 };
 265
 266 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 267                 struct nfs4_readdir_arg *readdir)
 268 {
 269         __be32 *start, *p;
 270
 271         if (cookie > 2) {
 272                 readdir->cookie = cookie;
 273                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 274                 return;
 275         }
 276
 277         readdir->cookie = 0;
 278         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 279         if (cookie == 2)
 280                 return;
 281
 282         /*
 283          * NFSv4 servers do not return entries for '.' and '..'
 284          * Therefore, we fake these entries here.  We let '.'
 285          * have cookie 0 and '..' have cookie 1.  Note that
 286          * when talking to the server, we always send cookie 0
 287          * instead of 1 or 2.
 288          */
 289         start = p = kmap_atomic(*readdir->pages);
 290
 291         if (cookie == 0) {
 292                 *p++ = xdr_one;                                  /* next */
 293                 *p++ = xdr_zero;                   /* cookie, first word */
 294                 *p++ = xdr_one;                   /* cookie, second word */
 295                 *p++ = xdr_one;                             /* entry len */
 296                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 297                 p++;
 298                 *p++ = xdr_one;                         /* bitmap length */
 299                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 300                 *p++ = htonl(8);              /* attribute buffer length */
 301                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 302         }
 303
 304         *p++ = xdr_one;                                  /* next */
 305         *p++ = xdr_zero;                   /* cookie, first word */
 306         *p++ = xdr_two;                   /* cookie, second word */
 307         *p++ = xdr_two;                             /* entry len */
 308         memcpy(p, "..\0\0", 4);                         /* entry */
 309         p++;
 310         *p++ = xdr_one;                         /* bitmap length */
 311         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 312         *p++ = htonl(8);              /* attribute buffer length */
 313         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 314
 315         readdir->pgbase = (char *)p - (char *)start;
 316         readdir->count -= readdir->pgbase;
 317         kunmap_atomic(start);
 318 }
 319
 320 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 321 {
 322         int res = 0;
 323
 324         might_sleep();
 325
 326         if (*timeout <= 0)
 327                 *timeout = NFS4_POLL_RETRY_MIN;
 328         if (*timeout > NFS4_POLL_RETRY_MAX)
 329                 *timeout = NFS4_POLL_RETRY_MAX;
 330         freezable_schedule_timeout_killable_unsafe(*timeout);
 331         if (fatal_signal_pending(current))
 332                 res = -ERESTARTSYS;
 333         *timeout <<= 1;
 334         return res;
 335 }
 336
 337 /* This is the error handling routine for processes that are allowed
 338  * to sleep.
 339  */
 340 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 341 {
 342         struct nfs_client *clp = server->nfs_client;
 343         struct nfs4_state *state = exception->state;
 344         struct inode *inode = exception->inode;
 345         int ret = errorcode;
 346
 347         exception->retry = 0;
 348         switch(errorcode) {
 349                 case 0:
 350                         return 0;
 351                 case -NFS4ERR_OPENMODE:
 352                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 353                                 nfs4_inode_return_delegation(inode);
 354                                 exception->retry = 1;
 355                                 return 0;
 356                         }
 357                         if (state == NULL)
 358                                 break;
 359                         ret = nfs4_schedule_stateid_recovery(server, state);
 360                         if (ret < 0)
 361                                 break;
 362                         goto wait_on_recovery;
 363                 case -NFS4ERR_DELEG_REVOKED:
 364                 case -NFS4ERR_ADMIN_REVOKED:
 365                 case -NFS4ERR_BAD_STATEID:
 366                         if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
 367                                 nfs_remove_bad_delegation(inode);
 368                                 exception->retry = 1;
 369                                 break;
 370                         }
 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 #if defined(CONFIG_NFS_V4_1)
 388                 case -NFS4ERR_BADSESSION:
 389                 case -NFS4ERR_BADSLOT:
 390                 case -NFS4ERR_BAD_HIGH_SLOT:
 391                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 392                 case -NFS4ERR_DEADSESSION:
 393                 case -NFS4ERR_SEQ_FALSE_RETRY:
 394                 case -NFS4ERR_SEQ_MISORDERED:
 395                         dprintk("%s ERROR: %d Reset session\n", __func__,
 396                                 errorcode);
 397                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 398                         goto wait_on_recovery;
 399 #endif /* defined(CONFIG_NFS_V4_1) */
 400                 case -NFS4ERR_FILE_OPEN:
 401                         if (exception->timeout > HZ) {
 402                                 /* We have retried a decent amount, time to
 403                                  * fail
 404                                  */
 405                                 ret = -EBUSY;
 406                                 break;
 407                         }
 408                 case -NFS4ERR_GRACE:
 409                 case -NFS4ERR_DELAY:
 410                         ret = nfs4_delay(server->client, &exception->timeout);
 411                         if (ret != 0)
 412                                 break;
 413                 case -NFS4ERR_RETRY_UNCACHED_REP:
 414                 case -NFS4ERR_OLD_STATEID:
 415                         exception->retry = 1;
 416                         break;
 417                 case -NFS4ERR_BADOWNER:
 418                         /* The following works around a Linux server bug! */
 419                 case -NFS4ERR_BADNAME:
 420                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 421                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 422                                 exception->retry = 1;
 423                                 printk(KERN_WARNING "NFS: v4 server %s "
 424                                                 "does not accept raw "
 425                                                 "uid/gids. "
 426                                                 "Reenabling the idmapper.\n",
 427                                                 server->nfs_client->cl_hostname);
 428                         }
 429         }
 430         /* We failed to handle the error */
 431         return nfs4_map_errors(ret);
 432 wait_on_recovery:
 433         ret = nfs4_wait_clnt_recover(clp);
 434         if (ret == 0)
 435                 exception->retry = 1;
 436         return ret;
 437 }
 438
 439 /*
 440  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 441  * or 'false' otherwise.
 442  */
 443 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 444 {
 445         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 446
 447         if (flavor == RPC_AUTH_GSS_KRB5I ||
 448             flavor == RPC_AUTH_GSS_KRB5P)
 449                 return true;
 450
 451         return false;
 452 }
 453
 454 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 455 {
 456         spin_lock(&clp->cl_lock);
 457         if (time_before(clp->cl_last_renewal,timestamp))
 458                 clp->cl_last_renewal = timestamp;
 459         spin_unlock(&clp->cl_lock);
 460 }
 461
 462 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 463 {
 464         do_renew_lease(server->nfs_client, timestamp);
 465 }
 466
 467 struct nfs4_call_sync_data {
 468         const struct nfs_server *seq_server;
 469         struct nfs4_sequence_args *seq_args;
 470         struct nfs4_sequence_res *seq_res;
 471 };
 472
 473 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 474                                struct nfs4_sequence_res *res, int cache_reply)
 475 {
 476         args->sa_slot = NULL;
 477         args->sa_cache_this = cache_reply;
 478         args->sa_privileged = 0;
 479
 480         res->sr_slot = NULL;
 481 }
 482
 483 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 484 {
 485         args->sa_privileged = 1;
 486 }
 487
 488 static int nfs40_setup_sequence(const struct nfs_server *server,
 489                                 struct nfs4_sequence_args *args,
 490                                 struct nfs4_sequence_res *res,
 491                                 struct rpc_task *task)
 492 {
 493         struct nfs4_slot_table *tbl = server->nfs_client->cl_slot_tbl;
 494         struct nfs4_slot *slot;
 495
 496         /* slot already allocated? */
 497         if (res->sr_slot != NULL)
 498                 goto out_start;
 499
 500         spin_lock(&tbl->slot_tbl_lock);
 501         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 502                 goto out_sleep;
 503
 504         slot = nfs4_alloc_slot(tbl);
 505         if (IS_ERR(slot)) {
 506                 if (slot == ERR_PTR(-ENOMEM))
 507                         task->tk_timeout = HZ >> 2;
 508                 goto out_sleep;
 509         }
 510         spin_unlock(&tbl->slot_tbl_lock);
 511
 512         args->sa_slot = slot;
 513         res->sr_slot = slot;
 514
 515 out_start:
 516         rpc_call_start(task);
 517         return 0;
 518
 519 out_sleep:
 520         if (args->sa_privileged)
 521                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 522                                 NULL, RPC_PRIORITY_PRIVILEGED);
 523         else
 524                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 525         spin_unlock(&tbl->slot_tbl_lock);
 526         return -EAGAIN;
 527 }
 528
 529 static int nfs40_sequence_done(struct rpc_task *task,
 530                                struct nfs4_sequence_res *res)
 531 {
 532         struct nfs4_slot *slot = res->sr_slot;
 533         struct nfs4_slot_table *tbl;
 534
 535         if (!RPC_WAS_SENT(task))
 536                 goto out;
 537
 538         tbl = slot->table;
 539         spin_lock(&tbl->slot_tbl_lock);
 540         if (!nfs41_wake_and_assign_slot(tbl, slot))
 541                 nfs4_free_slot(tbl, slot);
 542         spin_unlock(&tbl->slot_tbl_lock);
 543
 544         res->sr_slot = NULL;
 545 out:
 546         return 1;
 547 }
 548
 549 #if defined(CONFIG_NFS_V4_1)
 550
 551 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 552 {
 553         struct nfs4_session *session;
 554         struct nfs4_slot_table *tbl;
 555         bool send_new_highest_used_slotid = false;
 556
 557         if (!res->sr_slot) {
 558                 /* just wake up the next guy waiting since
 559                  * we may have not consumed a slot after all */
 560                 dprintk("%s: No slot\n", __func__);
 561                 return;
 562         }
 563         tbl = res->sr_slot->table;
 564         session = tbl->session;
 565
 566         spin_lock(&tbl->slot_tbl_lock);
 567         /* Be nice to the server: try to ensure that the last transmitted
 568          * value for highest_user_slotid <= target_highest_slotid
 569          */
 570         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 571                 send_new_highest_used_slotid = true;
 572
 573         if (nfs41_wake_and_assign_slot(tbl, res->sr_slot)) {
 574                 send_new_highest_used_slotid = false;
 575                 goto out_unlock;
 576         }
 577         nfs4_free_slot(tbl, res->sr_slot);
 578
 579         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 580                 send_new_highest_used_slotid = false;
 581 out_unlock:
 582         spin_unlock(&tbl->slot_tbl_lock);
 583         res->sr_slot = NULL;
 584         if (send_new_highest_used_slotid)
 585                 nfs41_server_notify_highest_slotid_update(session->clp);
 586 }
 587
 588 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 589 {
 590         struct nfs4_session *session;
 591         struct nfs4_slot *slot;
 592         struct nfs_client *clp;
 593         bool interrupted = false;
 594         int ret = 1;
 595
 596         /* don't increment the sequence number if the task wasn't sent */
 597         if (!RPC_WAS_SENT(task))
 598                 goto out;
 599
 600         slot = res->sr_slot;
 601         session = slot->table->session;
 602
 603         if (slot->interrupted) {
 604                 slot->interrupted = 0;
 605                 interrupted = true;
 606         }
 607
 608         trace_nfs4_sequence_done(session, res);
 609         /* Check the SEQUENCE operation status */
 610         switch (res->sr_status) {
 611         case 0:
 612                 /* Update the slot's sequence and clientid lease timer */
 613                 ++slot->seq_nr;
 614                 clp = session->clp;
 615                 do_renew_lease(clp, res->sr_timestamp);
 616                 /* Check sequence flags */
 617                 if (res->sr_status_flags != 0)
 618                         nfs4_schedule_lease_recovery(clp);
 619                 nfs41_update_target_slotid(slot->table, slot, res);
 620                 break;
 621         case 1:
 622                 /*
 623                  * sr_status remains 1 if an RPC level error occurred.
 624                  * The server may or may not have processed the sequence
 625                  * operation..
 626                  * Mark the slot as having hosted an interrupted RPC call.
 627                  */
 628                 slot->interrupted = 1;
 629                 goto out;
 630         case -NFS4ERR_DELAY:
 631                 /* The server detected a resend of the RPC call and
 632                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 633                  * of RFC5661.
 634                  */
 635                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 636                         __func__,
 637                         slot->slot_nr,
 638                         slot->seq_nr);
 639                 goto out_retry;
 640         case -NFS4ERR_BADSLOT:
 641                 /*
 642                  * The slot id we used was probably retired. Try again
 643                  * using a different slot id.
 644                  */
 645                 goto retry_nowait;
 646         case -NFS4ERR_SEQ_MISORDERED:
 647                 /*
 648                  * Was the last operation on this sequence interrupted?
 649                  * If so, retry after bumping the sequence number.
 650                  */
 651                 if (interrupted) {
 652                         ++slot->seq_nr;
 653                         goto retry_nowait;
 654                 }
 655                 /*
 656                  * Could this slot have been previously retired?
 657                  * If so, then the server may be expecting seq_nr = 1!
 658                  */
 659                 if (slot->seq_nr != 1) {
 660                         slot->seq_nr = 1;
 661                         goto retry_nowait;
 662                 }
 663                 break;
 664         case -NFS4ERR_SEQ_FALSE_RETRY:
 665                 ++slot->seq_nr;
 666                 goto retry_nowait;
 667         default:
 668                 /* Just update the slot sequence no. */
 669                 ++slot->seq_nr;
 670         }
 671 out:
 672         /* The session may be reset by one of the error handlers. */
 673         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 674         nfs41_sequence_free_slot(res);
 675         return ret;
 676 retry_nowait:
 677         if (rpc_restart_call_prepare(task)) {
 678                 task->tk_status = 0;
 679                 ret = 0;
 680         }
 681         goto out;
 682 out_retry:
 683         if (!rpc_restart_call(task))
 684                 goto out;
 685         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 686         return 0;
 687 }
 688
 689 static int nfs4_sequence_done(struct rpc_task *task,
 690                                struct nfs4_sequence_res *res)
 691 {
 692         if (res->sr_slot == NULL)
 693                 return 1;
 694         if (!res->sr_slot->table->session)
 695                 return nfs40_sequence_done(task, res);
 696         return nfs41_sequence_done(task, res);
 697 }
 698
 699 int nfs41_setup_sequence(struct nfs4_session *session,
 700                                 struct nfs4_sequence_args *args,
 701                                 struct nfs4_sequence_res *res,
 702                                 struct rpc_task *task)
 703 {
 704         struct nfs4_slot *slot;
 705         struct nfs4_slot_table *tbl;
 706
 707         dprintk("--> %s\n", __func__);
 708         /* slot already allocated? */
 709         if (res->sr_slot != NULL)
 710                 goto out_success;
 711
 712         tbl = &session->fc_slot_table;
 713
 714         task->tk_timeout = 0;
 715
 716         spin_lock(&tbl->slot_tbl_lock);
 717         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 718             !args->sa_privileged) {
 719                 /* The state manager will wait until the slot table is empty */
 720                 dprintk("%s session is draining\n", __func__);
 721                 goto out_sleep;
 722         }
 723
 724         slot = nfs4_alloc_slot(tbl);
 725         if (IS_ERR(slot)) {
 726                 /* If out of memory, try again in 1/4 second */
 727                 if (slot == ERR_PTR(-ENOMEM))
 728                         task->tk_timeout = HZ >> 2;
 729                 dprintk("<-- %s: no free slots\n", __func__);
 730                 goto out_sleep;
 731         }
 732         spin_unlock(&tbl->slot_tbl_lock);
 733
 734         args->sa_slot = slot;
 735
 736         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 737                         slot->slot_nr, slot->seq_nr);
 738
 739         res->sr_slot = slot;
 740         res->sr_timestamp = jiffies;
 741         res->sr_status_flags = 0;
 742         /*
 743          * sr_status is only set in decode_sequence, and so will remain
 744          * set to 1 if an rpc level failure occurs.
 745          */
 746         res->sr_status = 1;
 747         trace_nfs4_setup_sequence(session, args);
 748 out_success:
 749         rpc_call_start(task);
 750         return 0;
 751 out_sleep:
 752         /* Privileged tasks are queued with top priority */
 753         if (args->sa_privileged)
 754                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 755                                 NULL, RPC_PRIORITY_PRIVILEGED);
 756         else
 757                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 758         spin_unlock(&tbl->slot_tbl_lock);
 759         return -EAGAIN;
 760 }
 761 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 762
 763 static int nfs4_setup_sequence(const struct nfs_server *server,
 764                                struct nfs4_sequence_args *args,
 765                                struct nfs4_sequence_res *res,
 766                                struct rpc_task *task)
 767 {
 768         struct nfs4_session *session = nfs4_get_session(server);
 769         int ret = 0;
 770
 771         if (!session)
 772                 return nfs40_setup_sequence(server, args, res, task);
 773
 774         dprintk("--> %s clp %p session %p sr_slot %u\n",
 775                 __func__, session->clp, session, res->sr_slot ?
 776                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 777
 778         ret = nfs41_setup_sequence(session, args, res, task);
 779
 780         dprintk("<-- %s status=%d\n", __func__, ret);
 781         return ret;
 782 }
 783
 784 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 785 {
 786         struct nfs4_call_sync_data *data = calldata;
 787         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 788
 789         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 790
 791         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 792 }
 793
 794 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 795 {
 796         struct nfs4_call_sync_data *data = calldata;
 797
 798         nfs41_sequence_done(task, data->seq_res);
 799 }
 800
 801 static const struct rpc_call_ops nfs41_call_sync_ops = {
 802         .rpc_call_prepare = nfs41_call_sync_prepare,
 803         .rpc_call_done = nfs41_call_sync_done,
 804 };
 805
 806 #else   /* !CONFIG_NFS_V4_1 */
 807
 808 static int nfs4_setup_sequence(const struct nfs_server *server,
 809                                struct nfs4_sequence_args *args,
 810                                struct nfs4_sequence_res *res,
 811                                struct rpc_task *task)
 812 {
 813         return nfs40_setup_sequence(server, args, res, task);
 814 }
 815
 816 static int nfs4_sequence_done(struct rpc_task *task,
 817                                struct nfs4_sequence_res *res)
 818 {
 819         return nfs40_sequence_done(task, res);
 820 }
 821
 822 #endif  /* !CONFIG_NFS_V4_1 */
 823
 824 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 825 {
 826         struct nfs4_call_sync_data *data = calldata;
 827         nfs4_setup_sequence(data->seq_server,
 828                                 data->seq_args, data->seq_res, task);
 829 }
 830
 831 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 832 {
 833         struct nfs4_call_sync_data *data = calldata;
 834         nfs4_sequence_done(task, data->seq_res);
 835 }
 836
 837 static const struct rpc_call_ops nfs40_call_sync_ops = {
 838         .rpc_call_prepare = nfs40_call_sync_prepare,
 839         .rpc_call_done = nfs40_call_sync_done,
 840 };
 841
 842 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 843                                    struct nfs_server *server,
 844                                    struct rpc_message *msg,
 845                                    struct nfs4_sequence_args *args,
 846                                    struct nfs4_sequence_res *res)
 847 {
 848         int ret;
 849         struct rpc_task *task;
 850         struct nfs_client *clp = server->nfs_client;
 851         struct nfs4_call_sync_data data = {
 852                 .seq_server = server,
 853                 .seq_args = args,
 854                 .seq_res = res,
 855         };
 856         struct rpc_task_setup task_setup = {
 857                 .rpc_client = clnt,
 858                 .rpc_message = msg,
 859                 .callback_ops = clp->cl_mvops->call_sync_ops,
 860                 .callback_data = &data
 861         };
 862
 863         task = rpc_run_task(&task_setup);
 864         if (IS_ERR(task))
 865                 ret = PTR_ERR(task);
 866         else {
 867                 ret = task->tk_status;
 868                 rpc_put_task(task);
 869         }
 870         return ret;
 871 }
 872
 873 static
 874 int nfs4_call_sync(struct rpc_clnt *clnt,
 875                    struct nfs_server *server,
 876                    struct rpc_message *msg,
 877                    struct nfs4_sequence_args *args,
 878                    struct nfs4_sequence_res *res,
 879                    int cache_reply)
 880 {
 881         nfs4_init_sequence(args, res, cache_reply);
 882         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 883 }
 884
 885 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 886 {
 887         struct nfs_inode *nfsi = NFS_I(dir);
 888
 889         spin_lock(&dir->i_lock);
 890         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 891         if (!cinfo->atomic || cinfo->before != dir->i_version)
 892                 nfs_force_lookup_revalidate(dir);
 893         dir->i_version = cinfo->after;
 894         nfs_fscache_invalidate(dir);
 895         spin_unlock(&dir->i_lock);
 896 }
 897
 898 struct nfs4_opendata {
 899         struct kref kref;
 900         struct nfs_openargs o_arg;
 901         struct nfs_openres o_res;
 902         struct nfs_open_confirmargs c_arg;
 903         struct nfs_open_confirmres c_res;
 904         struct nfs4_string owner_name;
 905         struct nfs4_string group_name;
 906         struct nfs_fattr f_attr;
 907         struct nfs4_label *f_label;
 908         struct dentry *dir;
 909         struct dentry *dentry;
 910         struct nfs4_state_owner *owner;
 911         struct nfs4_state *state;
 912         struct iattr attrs;
 913         unsigned long timestamp;
 914         unsigned int rpc_done : 1;
 915         unsigned int file_created : 1;
 916         unsigned int is_recover : 1;
 917         int rpc_status;
 918         int cancelled;
 919 };
 920
 921 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 922                 int err, struct nfs4_exception *exception)
 923 {
 924         if (err != -EINVAL)
 925                 return false;
 926         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 927                 return false;
 928         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 929         exception->retry = 1;
 930         return true;
 931 }
 932
 933 static enum open_claim_type4
 934 nfs4_map_atomic_open_claim(struct nfs_server *server,
 935                 enum open_claim_type4 claim)
 936 {
 937         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 938                 return claim;
 939         switch (claim) {
 940         default:
 941                 return claim;
 942         case NFS4_OPEN_CLAIM_FH:
 943                 return NFS4_OPEN_CLAIM_NULL;
 944         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 945                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 946         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 947                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 948         }
 949 }
 950
 951 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 952 {
 953         p->o_res.f_attr = &p->f_attr;
 954         p->o_res.f_label = p->f_label;
 955         p->o_res.seqid = p->o_arg.seqid;
 956         p->c_res.seqid = p->c_arg.seqid;
 957         p->o_res.server = p->o_arg.server;
 958         p->o_res.access_request = p->o_arg.access;
 959         nfs_fattr_init(&p->f_attr);
 960         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 961 }
 962
 963 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 964                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 965                 const struct iattr *attrs,
 966                 struct nfs4_label *label,
 967                 enum open_claim_type4 claim,
 968                 gfp_t gfp_mask)
 969 {
 970         struct dentry *parent = dget_parent(dentry);
 971         struct inode *dir = parent->d_inode;
 972         struct nfs_server *server = NFS_SERVER(dir);
 973         struct nfs4_opendata *p;
 974
 975         p = kzalloc(sizeof(*p), gfp_mask);
 976         if (p == NULL)
 977                 goto err;
 978
 979         p->f_label = nfs4_label_alloc(server, gfp_mask);
 980         if (IS_ERR(p->f_label))
 981                 goto err_free_p;
 982
 983         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 984         if (p->o_arg.seqid == NULL)
 985                 goto err_free_label;
 986         nfs_sb_active(dentry->d_sb);
 987         p->dentry = dget(dentry);
 988         p->dir = parent;
 989         p->owner = sp;
 990         atomic_inc(&sp->so_count);
 991         p->o_arg.open_flags = flags;
 992         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 993         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 994          * will return permission denied for all bits until close */
 995         if (!(flags & O_EXCL)) {
 996                 /* ask server to check for all possible rights as results
 997                  * are cached */
 998                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 999                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1000         }
1001         p->o_arg.clientid = server->nfs_client->cl_clientid;
1002         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1003         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1004         p->o_arg.name = &dentry->d_name;
1005         p->o_arg.server = server;
1006         p->o_arg.bitmask = nfs4_bitmask(server, label);
1007         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1008         p->o_arg.label = label;
1009         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1010         switch (p->o_arg.claim) {
1011         case NFS4_OPEN_CLAIM_NULL:
1012         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1013         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1014                 p->o_arg.fh = NFS_FH(dir);
1015                 break;
1016         case NFS4_OPEN_CLAIM_PREVIOUS:
1017         case NFS4_OPEN_CLAIM_FH:
1018         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1019         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1020                 p->o_arg.fh = NFS_FH(dentry->d_inode);
1021         }
1022         if (attrs != NULL && attrs->ia_valid != 0) {
1023                 __u32 verf[2];
1024
1025                 p->o_arg.u.attrs = &p->attrs;
1026                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1027
1028                 verf[0] = jiffies;
1029                 verf[1] = current->pid;
1030                 memcpy(p->o_arg.u.verifier.data, verf,
1031                                 sizeof(p->o_arg.u.verifier.data));
1032         }
1033         p->c_arg.fh = &p->o_res.fh;
1034         p->c_arg.stateid = &p->o_res.stateid;
1035         p->c_arg.seqid = p->o_arg.seqid;
1036         nfs4_init_opendata_res(p);
1037         kref_init(&p->kref);
1038         return p;
1039
1040 err_free_label:
1041         nfs4_label_free(p->f_label);
1042 err_free_p:
1043         kfree(p);
1044 err:
1045         dput(parent);
1046         return NULL;
1047 }
1048
1049 static void nfs4_opendata_free(struct kref *kref)
1050 {
1051         struct nfs4_opendata *p = container_of(kref,
1052                         struct nfs4_opendata, kref);
1053         struct super_block *sb = p->dentry->d_sb;
1054
1055         nfs_free_seqid(p->o_arg.seqid);
1056         if (p->state != NULL)
1057                 nfs4_put_open_state(p->state);
1058         nfs4_put_state_owner(p->owner);
1059
1060         nfs4_label_free(p->f_label);
1061
1062         dput(p->dir);
1063         dput(p->dentry);
1064         nfs_sb_deactive(sb);
1065         nfs_fattr_free_names(&p->f_attr);
1066         kfree(p);
1067 }
1068
1069 static void nfs4_opendata_put(struct nfs4_opendata *p)
1070 {
1071         if (p != NULL)
1072                 kref_put(&p->kref, nfs4_opendata_free);
1073 }
1074
1075 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1076 {
1077         int ret;
1078
1079         ret = rpc_wait_for_completion_task(task);
1080         return ret;
1081 }
1082
1083 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1084 {
1085         int ret = 0;
1086
1087         if (open_mode & (O_EXCL|O_TRUNC))
1088                 goto out;
1089         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1090                 case FMODE_READ:
1091                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1092                                 && state->n_rdonly != 0;
1093                         break;
1094                 case FMODE_WRITE:
1095                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1096                                 && state->n_wronly != 0;
1097                         break;
1098                 case FMODE_READ|FMODE_WRITE:
1099                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1100                                 && state->n_rdwr != 0;
1101         }
1102 out:
1103         return ret;
1104 }
1105
1106 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1107 {
1108         if (delegation == NULL)
1109                 return 0;
1110         if ((delegation->type & fmode) != fmode)
1111                 return 0;
1112         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1113                 return 0;
1114         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1115                 return 0;
1116         nfs_mark_delegation_referenced(delegation);
1117         return 1;
1118 }
1119
1120 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1121 {
1122         switch (fmode) {
1123                 case FMODE_WRITE:
1124                         state->n_wronly++;
1125                         break;
1126                 case FMODE_READ:
1127                         state->n_rdonly++;
1128                         break;
1129                 case FMODE_READ|FMODE_WRITE:
1130                         state->n_rdwr++;
1131         }
1132         nfs4_state_set_mode_locked(state, state->state | fmode);
1133 }
1134
1135 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1136 {
1137         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1138                 nfs4_stateid_copy(&state->stateid, stateid);
1139         nfs4_stateid_copy(&state->open_stateid, stateid);
1140         set_bit(NFS_OPEN_STATE, &state->flags);
1141         switch (fmode) {
1142                 case FMODE_READ:
1143                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1144                         break;
1145                 case FMODE_WRITE:
1146                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1147                         break;
1148                 case FMODE_READ|FMODE_WRITE:
1149                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1150         }
1151 }
1152
1153 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1154 {
1155         write_seqlock(&state->seqlock);
1156         nfs_set_open_stateid_locked(state, stateid, fmode);
1157         write_sequnlock(&state->seqlock);
1158 }
1159
1160 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1161 {
1162         /*
1163          * Protect the call to nfs4_state_set_mode_locked and
1164          * serialise the stateid update
1165          */
1166         write_seqlock(&state->seqlock);
1167         if (deleg_stateid != NULL) {
1168                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1169                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1170         }
1171         if (open_stateid != NULL)
1172                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1173         write_sequnlock(&state->seqlock);
1174         spin_lock(&state->owner->so_lock);
1175         update_open_stateflags(state, fmode);
1176         spin_unlock(&state->owner->so_lock);
1177 }
1178
1179 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1180 {
1181         struct nfs_inode *nfsi = NFS_I(state->inode);
1182         struct nfs_delegation *deleg_cur;
1183         int ret = 0;
1184
1185         fmode &= (FMODE_READ|FMODE_WRITE);
1186
1187         rcu_read_lock();
1188         deleg_cur = rcu_dereference(nfsi->delegation);
1189         if (deleg_cur == NULL)
1190                 goto no_delegation;
1191
1192         spin_lock(&deleg_cur->lock);
1193         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1194            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1195             (deleg_cur->type & fmode) != fmode)
1196                 goto no_delegation_unlock;
1197
1198         if (delegation == NULL)
1199                 delegation = &deleg_cur->stateid;
1200         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1201                 goto no_delegation_unlock;
1202
1203         nfs_mark_delegation_referenced(deleg_cur);
1204         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1205         ret = 1;
1206 no_delegation_unlock:
1207         spin_unlock(&deleg_cur->lock);
1208 no_delegation:
1209         rcu_read_unlock();
1210
1211         if (!ret && open_stateid != NULL) {
1212                 __update_open_stateid(state, open_stateid, NULL, fmode);
1213                 ret = 1;
1214         }
1215
1216         return ret;
1217 }
1218
1219
1220 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1221 {
1222         struct nfs_delegation *delegation;
1223
1224         rcu_read_lock();
1225         delegation = rcu_dereference(NFS_I(inode)->delegation);
1226         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1227                 rcu_read_unlock();
1228                 return;
1229         }
1230         rcu_read_unlock();
1231         nfs4_inode_return_delegation(inode);
1232 }
1233
1234 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1235 {
1236         struct nfs4_state *state = opendata->state;
1237         struct nfs_inode *nfsi = NFS_I(state->inode);
1238         struct nfs_delegation *delegation;
1239         int open_mode = opendata->o_arg.open_flags;
1240         fmode_t fmode = opendata->o_arg.fmode;
1241         nfs4_stateid stateid;
1242         int ret = -EAGAIN;
1243
1244         for (;;) {
1245                 if (can_open_cached(state, fmode, open_mode)) {
1246                         spin_lock(&state->owner->so_lock);
1247                         if (can_open_cached(state, fmode, open_mode)) {
1248                                 update_open_stateflags(state, fmode);
1249                                 spin_unlock(&state->owner->so_lock);
1250                                 goto out_return_state;
1251                         }
1252                         spin_unlock(&state->owner->so_lock);
1253                 }
1254                 rcu_read_lock();
1255                 delegation = rcu_dereference(nfsi->delegation);
1256                 if (!can_open_delegated(delegation, fmode)) {
1257                         rcu_read_unlock();
1258                         break;
1259                 }
1260                 /* Save the delegation */
1261                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1262                 rcu_read_unlock();
1263                 nfs_release_seqid(opendata->o_arg.seqid);
1264                 if (!opendata->is_recover) {
1265                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1266                         if (ret != 0)
1267                                 goto out;
1268                 }
1269                 ret = -EAGAIN;
1270
1271                 /* Try to update the stateid using the delegation */
1272                 if (update_open_stateid(state, NULL, &stateid, fmode))
1273                         goto out_return_state;
1274         }
1275 out:
1276         return ERR_PTR(ret);
1277 out_return_state:
1278         atomic_inc(&state->count);
1279         return state;
1280 }
1281
1282 static void
1283 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1284 {
1285         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1286         struct nfs_delegation *delegation;
1287         int delegation_flags = 0;
1288
1289         rcu_read_lock();
1290         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1291         if (delegation)
1292                 delegation_flags = delegation->flags;
1293         rcu_read_unlock();
1294         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1295                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1296                                    "returning a delegation for "
1297                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1298                                    clp->cl_hostname);
1299         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1300                 nfs_inode_set_delegation(state->inode,
1301                                          data->owner->so_cred,
1302                                          &data->o_res);
1303         else
1304                 nfs_inode_reclaim_delegation(state->inode,
1305                                              data->owner->so_cred,
1306                                              &data->o_res);
1307 }
1308
1309 /*
1310  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1311  * and update the nfs4_state.
1312  */
1313 static struct nfs4_state *
1314 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1315 {
1316         struct inode *inode = data->state->inode;
1317         struct nfs4_state *state = data->state;
1318         int ret;
1319
1320         /* allow cached opens (!rpc_done && !rpc_status) */
1321         if (!data->rpc_done && data->rpc_status) {
1322                 ret = data->rpc_status;
1323                 goto err;
1324         }
1325
1326         ret = -ESTALE;
1327         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1328             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1329             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1330                 goto err;
1331
1332         ret = -ENOMEM;
1333         state = nfs4_get_open_state(inode, data->owner);
1334         if (state == NULL)
1335                 goto err;
1336
1337         ret = nfs_refresh_inode(inode, &data->f_attr);
1338         if (ret)
1339                 goto err;
1340
1341         if (data->o_res.delegation_type != 0)
1342                 nfs4_opendata_check_deleg(data, state);
1343         update_open_stateid(state, &data->o_res.stateid, NULL,
1344                             data->o_arg.fmode);
1345
1346         return state;
1347 err:
1348         return ERR_PTR(ret);
1349
1350 }
1351
1352 static struct nfs4_state *
1353 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1354 {
1355         struct inode *inode;
1356         struct nfs4_state *state = NULL;
1357         int ret;
1358
1359         if (!data->rpc_done) {
1360                 state = nfs4_try_open_cached(data);
1361                 goto out;
1362         }
1363
1364         ret = -EAGAIN;
1365         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1366                 goto err;
1367         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1368         ret = PTR_ERR(inode);
1369         if (IS_ERR(inode))
1370                 goto err;
1371         ret = -ENOMEM;
1372         state = nfs4_get_open_state(inode, data->owner);
1373         if (state == NULL)
1374                 goto err_put_inode;
1375         if (data->o_res.delegation_type != 0)
1376                 nfs4_opendata_check_deleg(data, state);
1377         update_open_stateid(state, &data->o_res.stateid, NULL,
1378                         data->o_arg.fmode);
1379         iput(inode);
1380 out:
1381         nfs_release_seqid(data->o_arg.seqid);
1382         return state;
1383 err_put_inode:
1384         iput(inode);
1385 err:
1386         return ERR_PTR(ret);
1387 }
1388
1389 static struct nfs4_state *
1390 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1391 {
1392         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1393                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1394         return _nfs4_opendata_to_nfs4_state(data);
1395 }
1396
1397 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1398 {
1399         struct nfs_inode *nfsi = NFS_I(state->inode);
1400         struct nfs_open_context *ctx;
1401
1402         spin_lock(&state->inode->i_lock);
1403         list_for_each_entry(ctx, &nfsi->open_files, list) {
1404                 if (ctx->state != state)
1405                         continue;
1406                 get_nfs_open_context(ctx);
1407                 spin_unlock(&state->inode->i_lock);
1408                 return ctx;
1409         }
1410         spin_unlock(&state->inode->i_lock);
1411         return ERR_PTR(-ENOENT);
1412 }
1413
1414 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1415                 struct nfs4_state *state, enum open_claim_type4 claim)
1416 {
1417         struct nfs4_opendata *opendata;
1418
1419         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1420                         NULL, NULL, claim, GFP_NOFS);
1421         if (opendata == NULL)
1422                 return ERR_PTR(-ENOMEM);
1423         opendata->state = state;
1424         atomic_inc(&state->count);
1425         return opendata;
1426 }
1427
1428 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1429 {
1430         struct nfs4_state *newstate;
1431         int ret;
1432
1433         opendata->o_arg.open_flags = 0;
1434         opendata->o_arg.fmode = fmode;
1435         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1436         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1437         nfs4_init_opendata_res(opendata);
1438         ret = _nfs4_recover_proc_open(opendata);
1439         if (ret != 0)
1440                 return ret;
1441         newstate = nfs4_opendata_to_nfs4_state(opendata);
1442         if (IS_ERR(newstate))
1443                 return PTR_ERR(newstate);
1444         nfs4_close_state(newstate, fmode);
1445         *res = newstate;
1446         return 0;
1447 }
1448
1449 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1450 {
1451         struct nfs4_state *newstate;
1452         int ret;
1453
1454         /* memory barrier prior to reading state->n_* */
1455         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1456         clear_bit(NFS_OPEN_STATE, &state->flags);
1457         smp_rmb();
1458         if (state->n_rdwr != 0) {
1459                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1460                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1461                 if (ret != 0)
1462                         return ret;
1463                 if (newstate != state)
1464                         return -ESTALE;
1465         }
1466         if (state->n_wronly != 0) {
1467                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1468                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1469                 if (ret != 0)
1470                         return ret;
1471                 if (newstate != state)
1472                         return -ESTALE;
1473         }
1474         if (state->n_rdonly != 0) {
1475                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1476                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1477                 if (ret != 0)
1478                         return ret;
1479                 if (newstate != state)
1480                         return -ESTALE;
1481         }
1482         /*
1483          * We may have performed cached opens for all three recoveries.
1484          * Check if we need to update the current stateid.
1485          */
1486         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1487             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1488                 write_seqlock(&state->seqlock);
1489                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1490                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1491                 write_sequnlock(&state->seqlock);
1492         }
1493         return 0;
1494 }
1495
1496 /*
1497  * OPEN_RECLAIM:
1498  *      reclaim state on the server after a reboot.
1499  */
1500 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1501 {
1502         struct nfs_delegation *delegation;
1503         struct nfs4_opendata *opendata;
1504         fmode_t delegation_type = 0;
1505         int status;
1506
1507         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1508                         NFS4_OPEN_CLAIM_PREVIOUS);
1509         if (IS_ERR(opendata))
1510                 return PTR_ERR(opendata);
1511         rcu_read_lock();
1512         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1513         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1514                 delegation_type = delegation->type;
1515         rcu_read_unlock();
1516         opendata->o_arg.u.delegation_type = delegation_type;
1517         status = nfs4_open_recover(opendata, state);
1518         nfs4_opendata_put(opendata);
1519         return status;
1520 }
1521
1522 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1523 {
1524         struct nfs_server *server = NFS_SERVER(state->inode);
1525         struct nfs4_exception exception = { };
1526         int err;
1527         do {
1528                 err = _nfs4_do_open_reclaim(ctx, state);
1529                 trace_nfs4_open_reclaim(ctx, 0, err);
1530                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1531                         continue;
1532                 if (err != -NFS4ERR_DELAY)
1533                         break;
1534                 nfs4_handle_exception(server, err, &exception);
1535         } while (exception.retry);
1536         return err;
1537 }
1538
1539 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1540 {
1541         struct nfs_open_context *ctx;
1542         int ret;
1543
1544         ctx = nfs4_state_find_open_context(state);
1545         if (IS_ERR(ctx))
1546                 return -EAGAIN;
1547         ret = nfs4_do_open_reclaim(ctx, state);
1548         put_nfs_open_context(ctx);
1549         return ret;
1550 }
1551
1552 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1553 {
1554         switch (err) {
1555                 default:
1556                         printk(KERN_ERR "NFS: %s: unhandled error "
1557                                         "%d.\n", __func__, err);
1558                 case 0:
1559                 case -ENOENT:
1560                 case -ESTALE:
1561                         break;
1562                 case -NFS4ERR_BADSESSION:
1563                 case -NFS4ERR_BADSLOT:
1564                 case -NFS4ERR_BAD_HIGH_SLOT:
1565                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1566                 case -NFS4ERR_DEADSESSION:
1567                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1568                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1569                         return -EAGAIN;
1570                 case -NFS4ERR_STALE_CLIENTID:
1571                 case -NFS4ERR_STALE_STATEID:
1572                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1573                 case -NFS4ERR_EXPIRED:
1574                         /* Don't recall a delegation if it was lost */
1575                         nfs4_schedule_lease_recovery(server->nfs_client);
1576                         return -EAGAIN;
1577                 case -NFS4ERR_DELEG_REVOKED:
1578                 case -NFS4ERR_ADMIN_REVOKED:
1579                 case -NFS4ERR_BAD_STATEID:
1580                 case -NFS4ERR_OPENMODE:
1581                         nfs_inode_find_state_and_recover(state->inode,
1582                                         stateid);
1583                         nfs4_schedule_stateid_recovery(server, state);
1584                         return 0;
1585                 case -NFS4ERR_DELAY:
1586                 case -NFS4ERR_GRACE:
1587                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1588                         ssleep(1);
1589                         return -EAGAIN;
1590                 case -ENOMEM:
1591                 case -NFS4ERR_DENIED:
1592                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1593                         return 0;
1594         }
1595         return err;
1596 }
1597
1598 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1599 {
1600         struct nfs_server *server = NFS_SERVER(state->inode);
1601         struct nfs4_opendata *opendata;
1602         int err;
1603
1604         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1605                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1606         if (IS_ERR(opendata))
1607                 return PTR_ERR(opendata);
1608         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1609         err = nfs4_open_recover(opendata, state);
1610         nfs4_opendata_put(opendata);
1611         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1612 }
1613
1614 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1615 {
1616         struct nfs4_opendata *data = calldata;
1617
1618         nfs40_setup_sequence(data->o_arg.server, &data->o_arg.seq_args,
1619                                 &data->o_res.seq_res, task);
1620 }
1621
1622 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1623 {
1624         struct nfs4_opendata *data = calldata;
1625
1626         nfs40_sequence_done(task, &data->o_res.seq_res);
1627
1628         data->rpc_status = task->tk_status;
1629         if (data->rpc_status == 0) {
1630                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1631                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1632                 renew_lease(data->o_res.server, data->timestamp);
1633                 data->rpc_done = 1;
1634         }
1635 }
1636
1637 static void nfs4_open_confirm_release(void *calldata)
1638 {
1639         struct nfs4_opendata *data = calldata;
1640         struct nfs4_state *state = NULL;
1641
1642         /* If this request hasn't been cancelled, do nothing */
1643         if (data->cancelled == 0)
1644                 goto out_free;
1645         /* In case of error, no cleanup! */
1646         if (!data->rpc_done)
1647                 goto out_free;
1648         state = nfs4_opendata_to_nfs4_state(data);
1649         if (!IS_ERR(state))
1650                 nfs4_close_state(state, data->o_arg.fmode);
1651 out_free:
1652         nfs4_opendata_put(data);
1653 }
1654
1655 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1656         .rpc_call_prepare = nfs4_open_confirm_prepare,
1657         .rpc_call_done = nfs4_open_confirm_done,
1658         .rpc_release = nfs4_open_confirm_release,
1659 };
1660
1661 /*
1662  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1663  */
1664 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1665 {
1666         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1667         struct rpc_task *task;
1668         struct  rpc_message msg = {
1669                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1670                 .rpc_argp = &data->c_arg,
1671                 .rpc_resp = &data->c_res,
1672                 .rpc_cred = data->owner->so_cred,
1673         };
1674         struct rpc_task_setup task_setup_data = {
1675                 .rpc_client = server->client,
1676                 .rpc_message = &msg,
1677                 .callback_ops = &nfs4_open_confirm_ops,
1678                 .callback_data = data,
1679                 .workqueue = nfsiod_workqueue,
1680                 .flags = RPC_TASK_ASYNC,
1681         };
1682         int status;
1683
1684         nfs4_init_sequence(&data->o_arg.seq_args, &data->o_res.seq_res, 1);
1685         kref_get(&data->kref);
1686         data->rpc_done = 0;
1687         data->rpc_status = 0;
1688         data->timestamp = jiffies;
1689         task = rpc_run_task(&task_setup_data);
1690         if (IS_ERR(task))
1691                 return PTR_ERR(task);
1692         status = nfs4_wait_for_completion_rpc_task(task);
1693         if (status != 0) {
1694                 data->cancelled = 1;
1695                 smp_wmb();
1696         } else
1697                 status = data->rpc_status;
1698         rpc_put_task(task);
1699         return status;
1700 }
1701
1702 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1703 {
1704         struct nfs4_opendata *data = calldata;
1705         struct nfs4_state_owner *sp = data->owner;
1706         struct nfs_client *clp = sp->so_server->nfs_client;
1707
1708         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1709                 goto out_wait;
1710         /*
1711          * Check if we still need to send an OPEN call, or if we can use
1712          * a delegation instead.
1713          */
1714         if (data->state != NULL) {
1715                 struct nfs_delegation *delegation;
1716
1717                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1718                         goto out_no_action;
1719                 rcu_read_lock();
1720                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1721                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1722                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1723                     can_open_delegated(delegation, data->o_arg.fmode))
1724                         goto unlock_no_action;
1725                 rcu_read_unlock();
1726         }
1727         /* Update client id. */
1728         data->o_arg.clientid = clp->cl_clientid;
1729         switch (data->o_arg.claim) {
1730         case NFS4_OPEN_CLAIM_PREVIOUS:
1731         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1732         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1733                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1734         case NFS4_OPEN_CLAIM_FH:
1735                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1736                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1737         }
1738         data->timestamp = jiffies;
1739         if (nfs4_setup_sequence(data->o_arg.server,
1740                                 &data->o_arg.seq_args,
1741                                 &data->o_res.seq_res,
1742                                 task) != 0)
1743                 nfs_release_seqid(data->o_arg.seqid);
1744
1745         /* Set the create mode (note dependency on the session type) */
1746         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1747         if (data->o_arg.open_flags & O_EXCL) {
1748                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1749                 if (nfs4_has_persistent_session(clp))
1750                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1751                 else if (clp->cl_mvops->minor_version > 0)
1752                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1753         }
1754         return;
1755 unlock_no_action:
1756         rcu_read_unlock();
1757 out_no_action:
1758         task->tk_action = NULL;
1759 out_wait:
1760         nfs4_sequence_done(task, &data->o_res.seq_res);
1761 }
1762
1763 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1764 {
1765         struct nfs4_opendata *data = calldata;
1766
1767         data->rpc_status = task->tk_status;
1768
1769         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1770                 return;
1771
1772         if (task->tk_status == 0) {
1773                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1774                         switch (data->o_res.f_attr->mode & S_IFMT) {
1775                         case S_IFREG:
1776                                 break;
1777                         case S_IFLNK:
1778                                 data->rpc_status = -ELOOP;
1779                                 break;
1780                         case S_IFDIR:
1781                                 data->rpc_status = -EISDIR;
1782                                 break;
1783                         default:
1784                                 data->rpc_status = -ENOTDIR;
1785                         }
1786                 }
1787                 renew_lease(data->o_res.server, data->timestamp);
1788                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1789                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1790         }
1791         data->rpc_done = 1;
1792 }
1793
1794 static void nfs4_open_release(void *calldata)
1795 {
1796         struct nfs4_opendata *data = calldata;
1797         struct nfs4_state *state = NULL;
1798
1799         /* If this request hasn't been cancelled, do nothing */
1800         if (data->cancelled == 0)
1801                 goto out_free;
1802         /* In case of error, no cleanup! */
1803         if (data->rpc_status != 0 || !data->rpc_done)
1804                 goto out_free;
1805         /* In case we need an open_confirm, no cleanup! */
1806         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1807                 goto out_free;
1808         state = nfs4_opendata_to_nfs4_state(data);
1809         if (!IS_ERR(state))
1810                 nfs4_close_state(state, data->o_arg.fmode);
1811 out_free:
1812         nfs4_opendata_put(data);
1813 }
1814
1815 static const struct rpc_call_ops nfs4_open_ops = {
1816         .rpc_call_prepare = nfs4_open_prepare,
1817         .rpc_call_done = nfs4_open_done,
1818         .rpc_release = nfs4_open_release,
1819 };
1820
1821 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1822 {
1823         struct inode *dir = data->dir->d_inode;
1824         struct nfs_server *server = NFS_SERVER(dir);
1825         struct nfs_openargs *o_arg = &data->o_arg;
1826         struct nfs_openres *o_res = &data->o_res;
1827         struct rpc_task *task;
1828         struct rpc_message msg = {
1829                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1830                 .rpc_argp = o_arg,
1831                 .rpc_resp = o_res,
1832                 .rpc_cred = data->owner->so_cred,
1833         };
1834         struct rpc_task_setup task_setup_data = {
1835                 .rpc_client = server->client,
1836                 .rpc_message = &msg,
1837                 .callback_ops = &nfs4_open_ops,
1838                 .callback_data = data,
1839                 .workqueue = nfsiod_workqueue,
1840                 .flags = RPC_TASK_ASYNC,
1841         };
1842         int status;
1843
1844         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1845         kref_get(&data->kref);
1846         data->rpc_done = 0;
1847         data->rpc_status = 0;
1848         data->cancelled = 0;
1849         data->is_recover = 0;
1850         if (isrecover) {
1851                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1852                 data->is_recover = 1;
1853         }
1854         task = rpc_run_task(&task_setup_data);
1855         if (IS_ERR(task))
1856                 return PTR_ERR(task);
1857         status = nfs4_wait_for_completion_rpc_task(task);
1858         if (status != 0) {
1859                 data->cancelled = 1;
1860                 smp_wmb();
1861         } else
1862                 status = data->rpc_status;
1863         rpc_put_task(task);
1864
1865         return status;
1866 }
1867
1868 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1869 {
1870         struct inode *dir = data->dir->d_inode;
1871         struct nfs_openres *o_res = &data->o_res;
1872         int status;
1873
1874         status = nfs4_run_open_task(data, 1);
1875         if (status != 0 || !data->rpc_done)
1876                 return status;
1877
1878         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1879
1880         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1881                 status = _nfs4_proc_open_confirm(data);
1882                 if (status != 0)
1883                         return status;
1884         }
1885
1886         return status;
1887 }
1888
1889 static int nfs4_opendata_access(struct rpc_cred *cred,
1890                                 struct nfs4_opendata *opendata,
1891                                 struct nfs4_state *state, fmode_t fmode,
1892                                 int openflags)
1893 {
1894         struct nfs_access_entry cache;
1895         u32 mask;
1896
1897         /* access call failed or for some reason the server doesn't
1898          * support any access modes -- defer access call until later */
1899         if (opendata->o_res.access_supported == 0)
1900                 return 0;
1901
1902         mask = 0;
1903         /* don't check MAY_WRITE - a newly created file may not have
1904          * write mode bits, but POSIX allows the creating process to write.
1905          * use openflags to check for exec, because fmode won't
1906          * always have FMODE_EXEC set when file open for exec. */
1907         if (openflags & __FMODE_EXEC) {
1908                 /* ONLY check for exec rights */
1909                 mask = MAY_EXEC;
1910         } else if (fmode & FMODE_READ)
1911                 mask = MAY_READ;
1912
1913         cache.cred = cred;
1914         cache.jiffies = jiffies;
1915         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1916         nfs_access_add_cache(state->inode, &cache);
1917
1918         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1919                 return 0;
1920
1921         /* even though OPEN succeeded, access is denied. Close the file */
1922         nfs4_close_state(state, fmode);
1923         return -EACCES;
1924 }
1925
1926 /*
1927  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1928  */
1929 static int _nfs4_proc_open(struct nfs4_opendata *data)
1930 {
1931         struct inode *dir = data->dir->d_inode;
1932         struct nfs_server *server = NFS_SERVER(dir);
1933         struct nfs_openargs *o_arg = &data->o_arg;
1934         struct nfs_openres *o_res = &data->o_res;
1935         int status;
1936
1937         status = nfs4_run_open_task(data, 0);
1938         if (!data->rpc_done)
1939                 return status;
1940         if (status != 0) {
1941                 if (status == -NFS4ERR_BADNAME &&
1942                                 !(o_arg->open_flags & O_CREAT))
1943                         return -ENOENT;
1944                 return status;
1945         }
1946
1947         nfs_fattr_map_and_free_names(server, &data->f_attr);
1948
1949         if (o_arg->open_flags & O_CREAT) {
1950                 update_changeattr(dir, &o_res->cinfo);
1951                 if (o_arg->open_flags & O_EXCL)
1952                         data->file_created = 1;
1953                 else if (o_res->cinfo.before != o_res->cinfo.after)
1954                         data->file_created = 1;
1955         }
1956         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1957                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1958         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1959                 status = _nfs4_proc_open_confirm(data);
1960                 if (status != 0)
1961                         return status;
1962         }
1963         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1964                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
1965         return 0;
1966 }
1967
1968 static int nfs4_recover_expired_lease(struct nfs_server *server)
1969 {
1970         return nfs4_client_recover_expired_lease(server->nfs_client);
1971 }
1972
1973 /*
1974  * OPEN_EXPIRED:
1975  *      reclaim state on the server after a network partition.
1976  *      Assumes caller holds the appropriate lock
1977  */
1978 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1979 {
1980         struct nfs4_opendata *opendata;
1981         int ret;
1982
1983         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1984                         NFS4_OPEN_CLAIM_FH);
1985         if (IS_ERR(opendata))
1986                 return PTR_ERR(opendata);
1987         ret = nfs4_open_recover(opendata, state);
1988         if (ret == -ESTALE)
1989                 d_drop(ctx->dentry);
1990         nfs4_opendata_put(opendata);
1991         return ret;
1992 }
1993
1994 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1995 {
1996         struct nfs_server *server = NFS_SERVER(state->inode);
1997         struct nfs4_exception exception = { };
1998         int err;
1999
2000         do {
2001                 err = _nfs4_open_expired(ctx, state);
2002                 trace_nfs4_open_expired(ctx, 0, err);
2003                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2004                         continue;
2005                 switch (err) {
2006                 default:
2007                         goto out;
2008                 case -NFS4ERR_GRACE:
2009                 case -NFS4ERR_DELAY:
2010                         nfs4_handle_exception(server, err, &exception);
2011                         err = 0;
2012                 }
2013         } while (exception.retry);
2014 out:
2015         return err;
2016 }
2017
2018 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2019 {
2020         struct nfs_open_context *ctx;
2021         int ret;
2022
2023         ctx = nfs4_state_find_open_context(state);
2024         if (IS_ERR(ctx))
2025                 return -EAGAIN;
2026         ret = nfs4_do_open_expired(ctx, state);
2027         put_nfs_open_context(ctx);
2028         return ret;
2029 }
2030
2031 #if defined(CONFIG_NFS_V4_1)
2032 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
2033 {
2034         struct nfs_server *server = NFS_SERVER(state->inode);
2035         nfs4_stateid *stateid = &state->stateid;
2036         struct nfs_delegation *delegation;
2037         struct rpc_cred *cred = NULL;
2038         int status = -NFS4ERR_BAD_STATEID;
2039
2040         /* If a state reset has been done, test_stateid is unneeded */
2041         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2042                 return;
2043
2044         /* Get the delegation credential for use by test/free_stateid */
2045         rcu_read_lock();
2046         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2047         if (delegation != NULL &&
2048             nfs4_stateid_match(&delegation->stateid, stateid)) {
2049                 cred = get_rpccred(delegation->cred);
2050                 rcu_read_unlock();
2051                 status = nfs41_test_stateid(server, stateid, cred);
2052                 trace_nfs4_test_delegation_stateid(state, NULL, status);
2053         } else
2054                 rcu_read_unlock();
2055
2056         if (status != NFS_OK) {
2057                 /* Free the stateid unless the server explicitly
2058                  * informs us the stateid is unrecognized. */
2059                 if (status != -NFS4ERR_BAD_STATEID)
2060                         nfs41_free_stateid(server, stateid, cred);
2061                 nfs_remove_bad_delegation(state->inode);
2062
2063                 write_seqlock(&state->seqlock);
2064                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2065                 write_sequnlock(&state->seqlock);
2066                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2067         }
2068
2069         if (cred != NULL)
2070                 put_rpccred(cred);
2071 }
2072
2073 /**
2074  * nfs41_check_open_stateid - possibly free an open stateid
2075  *
2076  * @state: NFSv4 state for an inode
2077  *
2078  * Returns NFS_OK if recovery for this stateid is now finished.
2079  * Otherwise a negative NFS4ERR value is returned.
2080  */
2081 static int nfs41_check_open_stateid(struct nfs4_state *state)
2082 {
2083         struct nfs_server *server = NFS_SERVER(state->inode);
2084         nfs4_stateid *stateid = &state->open_stateid;
2085         struct rpc_cred *cred = state->owner->so_cred;
2086         int status;
2087
2088         /* If a state reset has been done, test_stateid is unneeded */
2089         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2090             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2091             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2092                 return -NFS4ERR_BAD_STATEID;
2093
2094         status = nfs41_test_stateid(server, stateid, cred);
2095         trace_nfs4_test_open_stateid(state, NULL, status);
2096         if (status != NFS_OK) {
2097                 /* Free the stateid unless the server explicitly
2098                  * informs us the stateid is unrecognized. */
2099                 if (status != -NFS4ERR_BAD_STATEID)
2100                         nfs41_free_stateid(server, stateid, cred);
2101
2102                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2103                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2104                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2105                 clear_bit(NFS_OPEN_STATE, &state->flags);
2106         }
2107         return status;
2108 }
2109
2110 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2111 {
2112         int status;
2113
2114         nfs41_clear_delegation_stateid(state);
2115         status = nfs41_check_open_stateid(state);
2116         if (status != NFS_OK)
2117                 status = nfs4_open_expired(sp, state);
2118         return status;
2119 }
2120 #endif
2121
2122 /*
2123  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2124  * fields corresponding to attributes that were used to store the verifier.
2125  * Make sure we clobber those fields in the later setattr call
2126  */
2127 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2128 {
2129         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2130             !(sattr->ia_valid & ATTR_ATIME_SET))
2131                 sattr->ia_valid |= ATTR_ATIME;
2132
2133         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2134             !(sattr->ia_valid & ATTR_MTIME_SET))
2135                 sattr->ia_valid |= ATTR_MTIME;
2136 }
2137
2138 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2139                 fmode_t fmode,
2140                 int flags,
2141                 struct nfs_open_context *ctx)
2142 {
2143         struct nfs4_state_owner *sp = opendata->owner;
2144         struct nfs_server *server = sp->so_server;
2145         struct dentry *dentry;
2146         struct nfs4_state *state;
2147         unsigned int seq;
2148         int ret;
2149
2150         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2151
2152         ret = _nfs4_proc_open(opendata);
2153         if (ret != 0)
2154                 goto out;
2155
2156         state = nfs4_opendata_to_nfs4_state(opendata);
2157         ret = PTR_ERR(state);
2158         if (IS_ERR(state))
2159                 goto out;
2160         if (server->caps & NFS_CAP_POSIX_LOCK)
2161                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2162
2163         dentry = opendata->dentry;
2164         if (dentry->d_inode == NULL) {
2165                 /* FIXME: Is this d_drop() ever needed? */
2166                 d_drop(dentry);
2167                 dentry = d_add_unique(dentry, igrab(state->inode));
2168                 if (dentry == NULL) {
2169                         dentry = opendata->dentry;
2170                 } else if (dentry != ctx->dentry) {
2171                         dput(ctx->dentry);
2172                         ctx->dentry = dget(dentry);
2173                 }
2174                 nfs_set_verifier(dentry,
2175                                 nfs_save_change_attribute(opendata->dir->d_inode));
2176         }
2177
2178         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2179         if (ret != 0)
2180                 goto out;
2181
2182         ctx->state = state;
2183         if (dentry->d_inode == state->inode) {
2184                 nfs_inode_attach_open_context(ctx);
2185                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2186                         nfs4_schedule_stateid_recovery(server, state);
2187         }
2188 out:
2189         return ret;
2190 }
2191
2192 /*
2193  * Returns a referenced nfs4_state
2194  */
2195 static int _nfs4_do_open(struct inode *dir,
2196                         struct nfs_open_context *ctx,
2197                         int flags,
2198                         struct iattr *sattr,
2199                         struct nfs4_label *label,
2200                         int *opened)
2201 {
2202         struct nfs4_state_owner  *sp;
2203         struct nfs4_state     *state = NULL;
2204         struct nfs_server       *server = NFS_SERVER(dir);
2205         struct nfs4_opendata *opendata;
2206         struct dentry *dentry = ctx->dentry;
2207         struct rpc_cred *cred = ctx->cred;
2208         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2209         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2210         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2211         struct nfs4_label *olabel = NULL;
2212         int status;
2213
2214         /* Protect against reboot recovery conflicts */
2215         status = -ENOMEM;
2216         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2217         if (sp == NULL) {
2218                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2219                 goto out_err;
2220         }
2221         status = nfs4_recover_expired_lease(server);
2222         if (status != 0)
2223                 goto err_put_state_owner;
2224         if (dentry->d_inode != NULL)
2225                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2226         status = -ENOMEM;
2227         if (dentry->d_inode)
2228                 claim = NFS4_OPEN_CLAIM_FH;
2229         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2230                         label, claim, GFP_KERNEL);
2231         if (opendata == NULL)
2232                 goto err_put_state_owner;
2233
2234         if (label) {
2235                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2236                 if (IS_ERR(olabel)) {
2237                         status = PTR_ERR(olabel);
2238                         goto err_opendata_put;
2239                 }
2240         }
2241
2242         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2243                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2244                 if (!opendata->f_attr.mdsthreshold)
2245                         goto err_free_label;
2246                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2247         }
2248         if (dentry->d_inode != NULL)
2249                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2250
2251         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2252         if (status != 0)
2253                 goto err_free_label;
2254         state = ctx->state;
2255
2256         if ((opendata->o_arg.open_flags & O_EXCL) &&
2257             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2258                 nfs4_exclusive_attrset(opendata, sattr);
2259
2260                 nfs_fattr_init(opendata->o_res.f_attr);
2261                 status = nfs4_do_setattr(state->inode, cred,
2262                                 opendata->o_res.f_attr, sattr,
2263                                 state, label, olabel);
2264                 if (status == 0) {
2265                         nfs_setattr_update_inode(state->inode, sattr);
2266                         nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2267                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2268                 }
2269         }
2270         if (opendata->file_created)
2271                 *opened |= FILE_CREATED;
2272
2273         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2274                 *ctx_th = opendata->f_attr.mdsthreshold;
2275         else
2276                 kfree(opendata->f_attr.mdsthreshold);
2277         opendata->f_attr.mdsthreshold = NULL;
2278
2279         nfs4_label_free(olabel);
2280
2281         nfs4_opendata_put(opendata);
2282         nfs4_put_state_owner(sp);
2283         return 0;
2284 err_free_label:
2285         nfs4_label_free(olabel);
2286 err_opendata_put:
2287         kfree(opendata->f_attr.mdsthreshold);
2288         nfs4_opendata_put(opendata);
2289 err_put_state_owner:
2290         nfs4_put_state_owner(sp);
2291 out_err:
2292         return status;
2293 }
2294
2295
2296 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2297                                         struct nfs_open_context *ctx,
2298                                         int flags,
2299                                         struct iattr *sattr,
2300                                         struct nfs4_label *label,
2301                                         int *opened)
2302 {
2303         struct nfs_server *server = NFS_SERVER(dir);
2304         struct nfs4_exception exception = { };
2305         struct nfs4_state *res;
2306         int status;
2307
2308         do {
2309                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2310                 res = ctx->state;
2311                 trace_nfs4_open_file(ctx, flags, status);
2312                 if (status == 0)
2313                         break;
2314                 /* NOTE: BAD_SEQID means the server and client disagree about the
2315                  * book-keeping w.r.t. state-changing operations
2316                  * (OPEN/CLOSE/LOCK/LOCKU...)
2317                  * It is actually a sign of a bug on the client or on the server.
2318                  *
2319                  * If we receive a BAD_SEQID error in the particular case of
2320                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2321                  * have unhashed the old state_owner for us, and that we can
2322                  * therefore safely retry using a new one. We should still warn
2323                  * the user though...
2324                  */
2325                 if (status == -NFS4ERR_BAD_SEQID) {
2326                         pr_warn_ratelimited("NFS: v4 server %s "
2327                                         " returned a bad sequence-id error!\n",
2328                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2329                         exception.retry = 1;
2330                         continue;
2331                 }
2332                 /*
2333                  * BAD_STATEID on OPEN means that the server cancelled our
2334                  * state before it received the OPEN_CONFIRM.
2335                  * Recover by retrying the request as per the discussion
2336                  * on Page 181 of RFC3530.
2337                  */
2338                 if (status == -NFS4ERR_BAD_STATEID) {
2339                         exception.retry = 1;
2340                         continue;
2341                 }
2342                 if (status == -EAGAIN) {
2343                         /* We must have found a delegation */
2344                         exception.retry = 1;
2345                         continue;
2346                 }
2347                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2348                         continue;
2349                 res = ERR_PTR(nfs4_handle_exception(server,
2350                                         status, &exception));
2351         } while (exception.retry);
2352         return res;
2353 }
2354
2355 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2356                             struct nfs_fattr *fattr, struct iattr *sattr,
2357                             struct nfs4_state *state, struct nfs4_label *ilabel,
2358                             struct nfs4_label *olabel)
2359 {
2360         struct nfs_server *server = NFS_SERVER(inode);
2361         struct nfs_setattrargs  arg = {
2362                 .fh             = NFS_FH(inode),
2363                 .iap            = sattr,
2364                 .server         = server,
2365                 .bitmask = server->attr_bitmask,
2366                 .label          = ilabel,
2367         };
2368         struct nfs_setattrres  res = {
2369                 .fattr          = fattr,
2370                 .label          = olabel,
2371                 .server         = server,
2372         };
2373         struct rpc_message msg = {
2374                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2375                 .rpc_argp       = &arg,
2376                 .rpc_resp       = &res,
2377                 .rpc_cred       = cred,
2378         };
2379         unsigned long timestamp = jiffies;
2380         fmode_t fmode;
2381         bool truncate;
2382         int status;
2383
2384         arg.bitmask = nfs4_bitmask(server, ilabel);
2385         if (ilabel)
2386                 arg.bitmask = nfs4_bitmask(server, olabel);
2387
2388         nfs_fattr_init(fattr);
2389
2390         /* Servers should only apply open mode checks for file size changes */
2391         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2392         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2393
2394         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2395                 /* Use that stateid */
2396         } else if (truncate && state != NULL && nfs4_valid_open_stateid(state)) {
2397                 struct nfs_lockowner lockowner = {
2398                         .l_owner = current->files,
2399                         .l_pid = current->tgid,
2400                 };
2401                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2402                                 &lockowner);
2403         } else
2404                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2405
2406         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2407         if (status == 0 && state != NULL)
2408                 renew_lease(server, timestamp);
2409         return status;
2410 }
2411
2412 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2413                            struct nfs_fattr *fattr, struct iattr *sattr,
2414                            struct nfs4_state *state, struct nfs4_label *ilabel,
2415                            struct nfs4_label *olabel)
2416 {
2417         struct nfs_server *server = NFS_SERVER(inode);
2418         struct nfs4_exception exception = {
2419                 .state = state,
2420                 .inode = inode,
2421         };
2422         int err;
2423         do {
2424                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2425                 trace_nfs4_setattr(inode, err);
2426                 switch (err) {
2427                 case -NFS4ERR_OPENMODE:
2428                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2429                                 pr_warn_once("NFSv4: server %s is incorrectly "
2430                                                 "applying open mode checks to "
2431                                                 "a SETATTR that is not "
2432                                                 "changing file size.\n",
2433                                                 server->nfs_client->cl_hostname);
2434                         }
2435                         if (state && !(state->state & FMODE_WRITE)) {
2436                                 err = -EBADF;
2437                                 if (sattr->ia_valid & ATTR_OPEN)
2438                                         err = -EACCES;
2439                                 goto out;
2440                         }
2441                 }
2442                 err = nfs4_handle_exception(server, err, &exception);
2443         } while (exception.retry);
2444 out:
2445         return err;
2446 }
2447
2448 struct nfs4_closedata {
2449         struct inode *inode;
2450         struct nfs4_state *state;
2451         struct nfs_closeargs arg;
2452         struct nfs_closeres res;
2453         struct nfs_fattr fattr;
2454         unsigned long timestamp;
2455         bool roc;
2456         u32 roc_barrier;
2457 };
2458
2459 static void nfs4_free_closedata(void *data)
2460 {
2461         struct nfs4_closedata *calldata = data;
2462         struct nfs4_state_owner *sp = calldata->state->owner;
2463         struct super_block *sb = calldata->state->inode->i_sb;
2464
2465         if (calldata->roc)
2466                 pnfs_roc_release(calldata->state->inode);
2467         nfs4_put_open_state(calldata->state);
2468         nfs_free_seqid(calldata->arg.seqid);
2469         nfs4_put_state_owner(sp);
2470         nfs_sb_deactive(sb);
2471         kfree(calldata);
2472 }
2473
2474 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2475                 fmode_t fmode)
2476 {
2477         spin_lock(&state->owner->so_lock);
2478         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2479         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
2480         case FMODE_WRITE:
2481                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2482                 break;
2483         case FMODE_READ:
2484                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2485                 break;
2486         case 0:
2487                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2488                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2489                 clear_bit(NFS_OPEN_STATE, &state->flags);
2490         }
2491         spin_unlock(&state->owner->so_lock);
2492 }
2493
2494 static void nfs4_close_done(struct rpc_task *task, void *data)
2495 {
2496         struct nfs4_closedata *calldata = data;
2497         struct nfs4_state *state = calldata->state;
2498         struct nfs_server *server = NFS_SERVER(calldata->inode);
2499
2500         dprintk("%s: begin!\n", __func__);
2501         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2502                 return;
2503         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2504         /* hmm. we are done with the inode, and in the process of freeing
2505          * the state_owner. we keep this around to process errors
2506          */
2507         switch (task->tk_status) {
2508                 case 0:
2509                         if (calldata->roc)
2510                                 pnfs_roc_set_barrier(state->inode,
2511                                                      calldata->roc_barrier);
2512                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2513                         renew_lease(server, calldata->timestamp);
2514                         nfs4_close_clear_stateid_flags(state,
2515                                         calldata->arg.fmode);
2516                         break;
2517                 case -NFS4ERR_STALE_STATEID:
2518                 case -NFS4ERR_OLD_STATEID:
2519                 case -NFS4ERR_BAD_STATEID:
2520                 case -NFS4ERR_EXPIRED:
2521                         if (calldata->arg.fmode == 0)
2522                                 break;
2523                 default:
2524                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2525                                 rpc_restart_call_prepare(task);
2526         }
2527         nfs_release_seqid(calldata->arg.seqid);
2528         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2529         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2530 }
2531
2532 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2533 {
2534         struct nfs4_closedata *calldata = data;
2535         struct nfs4_state *state = calldata->state;
2536         struct inode *inode = calldata->inode;
2537         int call_close = 0;
2538
2539         dprintk("%s: begin!\n", __func__);
2540         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2541                 goto out_wait;
2542
2543         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2544         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2545         spin_lock(&state->owner->so_lock);
2546         /* Calculate the change in open mode */
2547         if (state->n_rdwr == 0) {
2548                 if (state->n_rdonly == 0) {
2549                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2550                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2551                         calldata->arg.fmode &= ~FMODE_READ;
2552                 }
2553                 if (state->n_wronly == 0) {
2554                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2555                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2556                         calldata->arg.fmode &= ~FMODE_WRITE;
2557                 }
2558         }
2559         if (!nfs4_valid_open_stateid(state))
2560                 call_close = 0;
2561         spin_unlock(&state->owner->so_lock);
2562
2563         if (!call_close) {
2564                 /* Note: exit _without_ calling nfs4_close_done */
2565                 goto out_no_action;
2566         }
2567
2568         if (calldata->arg.fmode == 0) {
2569                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2570                 if (calldata->roc &&
2571                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2572                         nfs_release_seqid(calldata->arg.seqid);
2573                         goto out_wait;
2574                     }
2575         }
2576
2577         nfs_fattr_init(calldata->res.fattr);
2578         calldata->timestamp = jiffies;
2579         if (nfs4_setup_sequence(NFS_SERVER(inode),
2580                                 &calldata->arg.seq_args,
2581                                 &calldata->res.seq_res,
2582                                 task) != 0)
2583                 nfs_release_seqid(calldata->arg.seqid);
2584         dprintk("%s: done!\n", __func__);
2585         return;
2586 out_no_action:
2587         task->tk_action = NULL;
2588 out_wait:
2589         nfs4_sequence_done(task, &calldata->res.seq_res);
2590 }
2591
2592 static const struct rpc_call_ops nfs4_close_ops = {
2593         .rpc_call_prepare = nfs4_close_prepare,
2594         .rpc_call_done = nfs4_close_done,
2595         .rpc_release = nfs4_free_closedata,
2596 };
2597
2598 /*
2599  * It is possible for data to be read/written from a mem-mapped file
2600  * after the sys_close call (which hits the vfs layer as a flush).
2601  * This means that we can't safely call nfsv4 close on a file until
2602  * the inode is cleared. This in turn means that we are not good
2603  * NFSv4 citizens - we do not indicate to the server to update the file's
2604  * share state even when we are done with one of the three share
2605  * stateid's in the inode.
2606  *
2607  * NOTE: Caller must be holding the sp->so_owner semaphore!
2608  */
2609 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2610 {
2611         struct nfs_server *server = NFS_SERVER(state->inode);
2612         struct nfs4_closedata *calldata;
2613         struct nfs4_state_owner *sp = state->owner;
2614         struct rpc_task *task;
2615         struct rpc_message msg = {
2616                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2617                 .rpc_cred = state->owner->so_cred,
2618         };
2619         struct rpc_task_setup task_setup_data = {
2620                 .rpc_client = server->client,
2621                 .rpc_message = &msg,
2622                 .callback_ops = &nfs4_close_ops,
2623                 .workqueue = nfsiod_workqueue,
2624                 .flags = RPC_TASK_ASYNC,
2625         };
2626         int status = -ENOMEM;
2627
2628         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2629                 &task_setup_data.rpc_client, &msg);
2630
2631         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2632         if (calldata == NULL)
2633                 goto out;
2634         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2635         calldata->inode = state->inode;
2636         calldata->state = state;
2637         calldata->arg.fh = NFS_FH(state->inode);
2638         calldata->arg.stateid = &state->open_stateid;
2639         /* Serialization for the sequence id */
2640         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2641         if (calldata->arg.seqid == NULL)
2642                 goto out_free_calldata;
2643         calldata->arg.fmode = 0;
2644         calldata->arg.bitmask = server->cache_consistency_bitmask;
2645         calldata->res.fattr = &calldata->fattr;
2646         calldata->res.seqid = calldata->arg.seqid;
2647         calldata->res.server = server;
2648         calldata->roc = pnfs_roc(state->inode);
2649         nfs_sb_active(calldata->inode->i_sb);
2650
2651         msg.rpc_argp = &calldata->arg;
2652         msg.rpc_resp = &calldata->res;
2653         task_setup_data.callback_data = calldata;
2654         task = rpc_run_task(&task_setup_data);
2655         if (IS_ERR(task))
2656                 return PTR_ERR(task);
2657         status = 0;
2658         if (wait)
2659                 status = rpc_wait_for_completion_task(task);
2660         rpc_put_task(task);
2661         return status;
2662 out_free_calldata:
2663         kfree(calldata);
2664 out:
2665         nfs4_put_open_state(state);
2666         nfs4_put_state_owner(sp);
2667         return status;
2668 }
2669
2670 static struct inode *
2671 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2672                 int open_flags, struct iattr *attr, int *opened)
2673 {
2674         struct nfs4_state *state;
2675         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2676
2677         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2678
2679         /* Protect against concurrent sillydeletes */
2680         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2681
2682         nfs4_label_release_security(label);
2683
2684         if (IS_ERR(state))
2685                 return ERR_CAST(state);
2686         return state->inode;
2687 }
2688
2689 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2690 {
2691         if (ctx->state == NULL)
2692                 return;
2693         if (is_sync)
2694                 nfs4_close_sync(ctx->state, ctx->mode);
2695         else
2696                 nfs4_close_state(ctx->state, ctx->mode);
2697 }
2698
2699 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2700 {
2701         struct nfs4_server_caps_arg args = {
2702                 .fhandle = fhandle,
2703         };
2704         struct nfs4_server_caps_res res = {};
2705         struct rpc_message msg = {
2706                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2707                 .rpc_argp = &args,
2708                 .rpc_resp = &res,
2709         };
2710         int status;
2711
2712         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2713         if (status == 0) {
2714                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2715                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2716                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2717                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2718                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2719                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2720                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2721                         server->caps |= NFS_CAP_ACLS;
2722                 if (res.has_links != 0)
2723                         server->caps |= NFS_CAP_HARDLINKS;
2724                 if (res.has_symlinks != 0)
2725                         server->caps |= NFS_CAP_SYMLINKS;
2726                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2727                         server->caps |= NFS_CAP_FILEID;
2728                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2729                         server->caps |= NFS_CAP_MODE;
2730                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2731                         server->caps |= NFS_CAP_NLINK;
2732                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2733                         server->caps |= NFS_CAP_OWNER;
2734                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2735                         server->caps |= NFS_CAP_OWNER_GROUP;
2736                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2737                         server->caps |= NFS_CAP_ATIME;
2738                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2739                         server->caps |= NFS_CAP_CTIME;
2740                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2741                         server->caps |= NFS_CAP_MTIME;
2742 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2743                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2744                         server->caps |= NFS_CAP_SECURITY_LABEL;
2745 #endif
2746                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2747                                 sizeof(server->attr_bitmask));
2748
2749                 if (server->caps & NFS_CAP_SECURITY_LABEL) {
2750                         server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2751                         res.attr_bitmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2752                 }
2753                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2754                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2755                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2756                 server->acl_bitmask = res.acl_bitmask;
2757                 server->fh_expire_type = res.fh_expire_type;
2758         }
2759
2760         return status;
2761 }
2762
2763 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2764 {
2765         struct nfs4_exception exception = { };
2766         int err;
2767         do {
2768                 err = nfs4_handle_exception(server,
2769                                 _nfs4_server_capabilities(server, fhandle),
2770                                 &exception);
2771         } while (exception.retry);
2772         return err;
2773 }
2774
2775 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2776                 struct nfs_fsinfo *info)
2777 {
2778         u32 bitmask[3];
2779         struct nfs4_lookup_root_arg args = {
2780                 .bitmask = bitmask,
2781         };
2782         struct nfs4_lookup_res res = {
2783                 .server = server,
2784                 .fattr = info->fattr,
2785                 .fh = fhandle,
2786         };
2787         struct rpc_message msg = {
2788                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2789                 .rpc_argp = &args,
2790                 .rpc_resp = &res,
2791         };
2792
2793         bitmask[0] = nfs4_fattr_bitmap[0];
2794         bitmask[1] = nfs4_fattr_bitmap[1];
2795         /*
2796          * Process the label in the upcoming getfattr
2797          */
2798         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2799
2800         nfs_fattr_init(info->fattr);
2801         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2802 }
2803
2804 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2805                 struct nfs_fsinfo *info)
2806 {
2807         struct nfs4_exception exception = { };
2808         int err;
2809         do {
2810                 err = _nfs4_lookup_root(server, fhandle, info);
2811                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2812                 switch (err) {
2813                 case 0:
2814                 case -NFS4ERR_WRONGSEC:
2815                         goto out;
2816                 default:
2817                         err = nfs4_handle_exception(server, err, &exception);
2818                 }
2819         } while (exception.retry);
2820 out:
2821         return err;
2822 }
2823
2824 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2825                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2826 {
2827         struct rpc_auth_create_args auth_args = {
2828                 .pseudoflavor = flavor,
2829         };
2830         struct rpc_auth *auth;
2831         int ret;
2832
2833         auth = rpcauth_create(&auth_args, server->client);
2834         if (IS_ERR(auth)) {
2835                 ret = -EACCES;
2836                 goto out;
2837         }
2838         ret = nfs4_lookup_root(server, fhandle, info);
2839 out:
2840         return ret;
2841 }
2842
2843 /*
2844  * Retry pseudoroot lookup with various security flavors.  We do this when:
2845  *
2846  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
2847  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
2848  *
2849  * Returns zero on success, or a negative NFS4ERR value, or a
2850  * negative errno value.
2851  */
2852 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2853                               struct nfs_fsinfo *info)
2854 {
2855         /* Per 3530bis 15.33.5 */
2856         static const rpc_authflavor_t flav_array[] = {
2857                 RPC_AUTH_GSS_KRB5P,
2858                 RPC_AUTH_GSS_KRB5I,
2859                 RPC_AUTH_GSS_KRB5,
2860                 RPC_AUTH_UNIX,                  /* courtesy */
2861                 RPC_AUTH_NULL,
2862         };
2863         int status = -EPERM;
2864         size_t i;
2865
2866         for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
2867                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2868                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2869                         continue;
2870                 break;
2871         }
2872
2873         /*
2874          * -EACCESS could mean that the user doesn't have correct permissions
2875          * to access the mount.  It could also mean that we tried to mount
2876          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2877          * existing mount programs don't handle -EACCES very well so it should
2878          * be mapped to -EPERM instead.
2879          */
2880         if (status == -EACCES)
2881                 status = -EPERM;
2882         return status;
2883 }
2884
2885 static int nfs4_do_find_root_sec(struct nfs_server *server,
2886                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
2887 {
2888         int mv = server->nfs_client->cl_minorversion;
2889         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
2890 }
2891
2892 /**
2893  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
2894  * @server: initialized nfs_server handle
2895  * @fhandle: we fill in the pseudo-fs root file handle
2896  * @info: we fill in an FSINFO struct
2897  * @auth_probe: probe the auth flavours
2898  *
2899  * Returns zero on success, or a negative errno.
2900  */
2901 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2902                          struct nfs_fsinfo *info,
2903                          bool auth_probe)
2904 {
2905         int status;
2906
2907         switch (auth_probe) {
2908         case false:
2909                 status = nfs4_lookup_root(server, fhandle, info);
2910                 if (status != -NFS4ERR_WRONGSEC)
2911                         break;
2912                 /* Did user force a 'sec=' mount option? */
2913                 if (server->flags & NFS_MOUNT_SECFLAVOUR)
2914                         break;
2915         default:
2916                 status = nfs4_do_find_root_sec(server, fhandle, info);
2917         }
2918
2919         if (status == 0)
2920                 status = nfs4_server_capabilities(server, fhandle);
2921         if (status == 0)
2922                 status = nfs4_do_fsinfo(server, fhandle, info);
2923
2924         return nfs4_map_errors(status);
2925 }
2926
2927 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2928                               struct nfs_fsinfo *info)
2929 {
2930         int error;
2931         struct nfs_fattr *fattr = info->fattr;
2932         struct nfs4_label *label = NULL;
2933
2934         error = nfs4_server_capabilities(server, mntfh);
2935         if (error < 0) {
2936                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2937                 return error;
2938         }
2939
2940         label = nfs4_label_alloc(server, GFP_KERNEL);
2941         if (IS_ERR(label))
2942                 return PTR_ERR(label);
2943
2944         error = nfs4_proc_getattr(server, mntfh, fattr, label);
2945         if (error < 0) {
2946                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2947                 goto err_free_label;
2948         }
2949
2950         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2951             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2952                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2953
2954 err_free_label:
2955         nfs4_label_free(label);
2956
2957         return error;
2958 }
2959
2960 /*
2961  * Get locations and (maybe) other attributes of a referral.
2962  * Note that we'll actually follow the referral later when
2963  * we detect fsid mismatch in inode revalidation
2964  */
2965 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2966                              const struct qstr *name, struct nfs_fattr *fattr,
2967                              struct nfs_fh *fhandle)
2968 {
2969         int status = -ENOMEM;
2970         struct page *page = NULL;
2971         struct nfs4_fs_locations *locations = NULL;
2972
2973         page = alloc_page(GFP_KERNEL);
2974         if (page == NULL)
2975                 goto out;
2976         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2977         if (locations == NULL)
2978                 goto out;
2979
2980         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2981         if (status != 0)
2982                 goto out;
2983         /* Make sure server returned a different fsid for the referral */
2984         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2985                 dprintk("%s: server did not return a different fsid for"
2986                         " a referral at %s\n", __func__, name->name);
2987                 status = -EIO;
2988                 goto out;
2989         }
2990         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2991         nfs_fixup_referral_attributes(&locations->fattr);
2992
2993         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2994         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2995         memset(fhandle, 0, sizeof(struct nfs_fh));
2996 out:
2997         if (page)
2998                 __free_page(page);
2999         kfree(locations);
3000         return status;
3001 }
3002
3003 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3004                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3005 {
3006         struct nfs4_getattr_arg args = {
3007                 .fh = fhandle,
3008                 .bitmask = server->attr_bitmask,
3009         };
3010         struct nfs4_getattr_res res = {
3011                 .fattr = fattr,
3012                 .label = label,
3013                 .server = server,
3014         };
3015         struct rpc_message msg = {
3016                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3017                 .rpc_argp = &args,
3018                 .rpc_resp = &res,
3019         };
3020
3021         args.bitmask = nfs4_bitmask(server, label);
3022
3023         nfs_fattr_init(fattr);
3024         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3025 }
3026
3027 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3028                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3029 {
3030         struct nfs4_exception exception = { };
3031         int err;
3032         do {
3033                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3034                 trace_nfs4_getattr(server, fhandle, fattr, err);
3035                 err = nfs4_handle_exception(server, err,
3036                                 &exception);
3037         } while (exception.retry);
3038         return err;
3039 }
3040
3041 /*
3042  * The file is not closed if it is opened due to the a request to change
3043  * the size of the file. The open call will not be needed once the
3044  * VFS layer lookup-intents are implemented.
3045  *
3046  * Close is called when the inode is destroyed.
3047  * If we haven't opened the file for O_WRONLY, we
3048  * need to in the size_change case to obtain a stateid.
3049  *
3050  * Got race?
3051  * Because OPEN is always done by name in nfsv4, it is
3052  * possible that we opened a different file by the same
3053  * name.  We can recognize this race condition, but we
3054  * can't do anything about it besides returning an error.
3055  *
3056  * This will be fixed with VFS changes (lookup-intent).
3057  */
3058 static int
3059 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3060                   struct iattr *sattr)
3061 {
3062         struct inode *inode = dentry->d_inode;
3063         struct rpc_cred *cred = NULL;
3064         struct nfs4_state *state = NULL;
3065         struct nfs4_label *label = NULL;
3066         int status;
3067
3068         if (pnfs_ld_layoutret_on_setattr(inode))
3069                 pnfs_commit_and_return_layout(inode);
3070
3071         nfs_fattr_init(fattr);
3072
3073         /* Deal with open(O_TRUNC) */
3074         if (sattr->ia_valid & ATTR_OPEN)
3075                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3076
3077         /* Optimization: if the end result is no change, don't RPC */
3078         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3079                 return 0;
3080
3081         /* Search for an existing open(O_WRITE) file */
3082         if (sattr->ia_valid & ATTR_FILE) {
3083                 struct nfs_open_context *ctx;
3084
3085                 ctx = nfs_file_open_context(sattr->ia_file);
3086                 if (ctx) {
3087                         cred = ctx->cred;
3088                         state = ctx->state;
3089                 }
3090         }
3091
3092         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3093         if (IS_ERR(label))
3094                 return PTR_ERR(label);
3095
3096         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3097         if (status == 0) {
3098                 nfs_setattr_update_inode(inode, sattr);
3099                 nfs_setsecurity(inode, fattr, label);
3100         }
3101         nfs4_label_free(label);
3102         return status;
3103 }
3104
3105 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3106                 const struct qstr *name, struct nfs_fh *fhandle,
3107                 struct nfs_fattr *fattr, struct nfs4_label *label)
3108 {
3109         struct nfs_server *server = NFS_SERVER(dir);
3110         int                    status;
3111         struct nfs4_lookup_arg args = {
3112                 .bitmask = server->attr_bitmask,
3113                 .dir_fh = NFS_FH(dir),
3114                 .name = name,
3115         };
3116         struct nfs4_lookup_res res = {
3117                 .server = server,
3118                 .fattr = fattr,
3119                 .label = label,
3120                 .fh = fhandle,
3121         };
3122         struct rpc_message msg = {
3123                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3124                 .rpc_argp = &args,
3125                 .rpc_resp = &res,
3126         };
3127
3128         args.bitmask = nfs4_bitmask(server, label);
3129
3130         nfs_fattr_init(fattr);
3131
3132         dprintk("NFS call  lookup %s\n", name->name);
3133         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3134         dprintk("NFS reply lookup: %d\n", status);
3135         return status;
3136 }
3137
3138 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3139 {
3140         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3141                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3142         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3143         fattr->nlink = 2;
3144 }
3145
3146 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3147                                    struct qstr *name, struct nfs_fh *fhandle,
3148                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3149 {
3150         struct nfs4_exception exception = { };
3151         struct rpc_clnt *client = *clnt;
3152         int err;
3153         do {
3154                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3155                 trace_nfs4_lookup(dir, name, err);
3156                 switch (err) {
3157                 case -NFS4ERR_BADNAME:
3158                         err = -ENOENT;
3159                         goto out;
3160                 case -NFS4ERR_MOVED:
3161                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3162                         goto out;
3163                 case -NFS4ERR_WRONGSEC:
3164                         err = -EPERM;
3165                         if (client != *clnt)
3166                                 goto out;
3167                         /* No security negotiation if the user specified 'sec=' */
3168                         if (NFS_SERVER(dir)->flags & NFS_MOUNT_SECFLAVOUR)
3169                                 goto out;
3170                         client = nfs4_create_sec_client(client, dir, name);
3171                         if (IS_ERR(client))
3172                                 return PTR_ERR(client);
3173
3174                         exception.retry = 1;
3175                         break;
3176                 default:
3177                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3178                 }
3179         } while (exception.retry);
3180
3181 out:
3182         if (err == 0)
3183                 *clnt = client;
3184         else if (client != *clnt)
3185                 rpc_shutdown_client(client);
3186
3187         return err;
3188 }
3189
3190 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3191                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3192                             struct nfs4_label *label)
3193 {
3194         int status;
3195         struct rpc_clnt *client = NFS_CLIENT(dir);
3196
3197         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3198         if (client != NFS_CLIENT(dir)) {
3199                 rpc_shutdown_client(client);
3200                 nfs_fixup_secinfo_attributes(fattr);
3201         }
3202         return status;
3203 }
3204
3205 struct rpc_clnt *
3206 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3207                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3208 {
3209         struct rpc_clnt *client = NFS_CLIENT(dir);
3210         int status;
3211
3212         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3213         if (status < 0)
3214                 return ERR_PTR(status);
3215         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3216 }
3217
3218 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3219 {
3220         struct nfs_server *server = NFS_SERVER(inode);
3221         struct nfs4_accessargs args = {
3222                 .fh = NFS_FH(inode),
3223                 .bitmask = server->cache_consistency_bitmask,
3224         };
3225         struct nfs4_accessres res = {
3226                 .server = server,
3227         };
3228         struct rpc_message msg = {
3229                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3230                 .rpc_argp = &args,
3231                 .rpc_resp = &res,
3232                 .rpc_cred = entry->cred,
3233         };
3234         int mode = entry->mask;
3235         int status = 0;
3236
3237         /*
3238          * Determine which access bits we want to ask for...
3239          */
3240         if (mode & MAY_READ)
3241                 args.access |= NFS4_ACCESS_READ;
3242         if (S_ISDIR(inode->i_mode)) {
3243                 if (mode & MAY_WRITE)
3244                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3245                 if (mode & MAY_EXEC)
3246                         args.access |= NFS4_ACCESS_LOOKUP;
3247         } else {
3248                 if (mode & MAY_WRITE)
3249                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3250                 if (mode & MAY_EXEC)
3251                         args.access |= NFS4_ACCESS_EXECUTE;
3252         }
3253
3254         res.fattr = nfs_alloc_fattr();
3255         if (res.fattr == NULL)
3256                 return -ENOMEM;
3257
3258         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3259         if (!status) {
3260                 nfs_access_set_mask(entry, res.access);
3261                 nfs_refresh_inode(inode, res.fattr);
3262         }
3263         nfs_free_fattr(res.fattr);
3264         return status;
3265 }
3266
3267 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3268 {
3269         struct nfs4_exception exception = { };
3270         int err;
3271         do {
3272                 err = _nfs4_proc_access(inode, entry);
3273                 trace_nfs4_access(inode, err);
3274                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3275                                 &exception);
3276         } while (exception.retry);
3277         return err;
3278 }
3279
3280 /*
3281  * TODO: For the time being, we don't try to get any attributes
3282  * along with any of the zero-copy operations READ, READDIR,
3283  * READLINK, WRITE.
3284  *
3285  * In the case of the first three, we want to put the GETATTR
3286  * after the read-type operation -- this is because it is hard
3287  * to predict the length of a GETATTR response in v4, and thus
3288  * align the READ data correctly.  This means that the GETATTR
3289  * may end up partially falling into the page cache, and we should
3290  * shift it into the 'tail' of the xdr_buf before processing.
3291  * To do this efficiently, we need to know the total length
3292  * of data received, which doesn't seem to be available outside
3293  * of the RPC layer.
3294  *
3295  * In the case of WRITE, we also want to put the GETATTR after
3296  * the operation -- in this case because we want to make sure
3297  * we get the post-operation mtime and size.
3298  *
3299  * Both of these changes to the XDR layer would in fact be quite
3300  * minor, but I decided to leave them for a subsequent patch.
3301  */
3302 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3303                 unsigned int pgbase, unsigned int pglen)
3304 {
3305         struct nfs4_readlink args = {
3306                 .fh       = NFS_FH(inode),
3307                 .pgbase   = pgbase,
3308                 .pglen    = pglen,
3309                 .pages    = &page,
3310         };
3311         struct nfs4_readlink_res res;
3312         struct rpc_message msg = {
3313                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3314                 .rpc_argp = &args,
3315                 .rpc_resp = &res,
3316         };
3317
3318         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3319 }
3320
3321 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3322                 unsigned int pgbase, unsigned int pglen)
3323 {
3324         struct nfs4_exception exception = { };
3325         int err;
3326         do {
3327                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3328                 trace_nfs4_readlink(inode, err);
3329                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3330                                 &exception);
3331         } while (exception.retry);
3332         return err;
3333 }
3334
3335 /*
3336  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3337  */
3338 static int
3339 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3340                  int flags)
3341 {
3342         struct nfs4_label l, *ilabel = NULL;
3343         struct nfs_open_context *ctx;
3344         struct nfs4_state *state;
3345         int opened = 0;
3346         int status = 0;
3347
3348         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3349         if (IS_ERR(ctx))
3350                 return PTR_ERR(ctx);
3351
3352         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3353
3354         sattr->ia_mode &= ~current_umask();
3355         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3356         if (IS_ERR(state)) {
3357                 status = PTR_ERR(state);
3358                 goto out;
3359         }
3360 out:
3361         nfs4_label_release_security(ilabel);
3362         put_nfs_open_context(ctx);
3363         return status;
3364 }
3365
3366 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3367 {
3368         struct nfs_server *server = NFS_SERVER(dir);
3369         struct nfs_removeargs args = {
3370                 .fh = NFS_FH(dir),
3371                 .name = *name,
3372         };
3373         struct nfs_removeres res = {
3374                 .server = server,
3375         };
3376         struct rpc_message msg = {
3377                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3378                 .rpc_argp = &args,
3379                 .rpc_resp = &res,
3380         };
3381         int status;
3382
3383         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3384         if (status == 0)
3385                 update_changeattr(dir, &res.cinfo);
3386         return status;
3387 }
3388
3389 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3390 {
3391         struct nfs4_exception exception = { };
3392         int err;
3393         do {
3394                 err = _nfs4_proc_remove(dir, name);
3395                 trace_nfs4_remove(dir, name, err);
3396                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3397                                 &exception);
3398         } while (exception.retry);
3399         return err;
3400 }
3401
3402 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3403 {
3404         struct nfs_server *server = NFS_SERVER(dir);
3405         struct nfs_removeargs *args = msg->rpc_argp;
3406         struct nfs_removeres *res = msg->rpc_resp;
3407
3408         res->server = server;
3409         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3410         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3411
3412         nfs_fattr_init(res->dir_attr);
3413 }
3414
3415 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3416 {
3417         nfs4_setup_sequence(NFS_SERVER(data->dir),
3418                         &data->args.seq_args,
3419                         &data->res.seq_res,
3420                         task);
3421 }
3422
3423 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3424 {
3425         struct nfs_unlinkdata *data = task->tk_calldata;
3426         struct nfs_removeres *res = &data->res;
3427
3428         if (!nfs4_sequence_done(task, &res->seq_res))
3429                 return 0;
3430         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3431                 return 0;
3432         update_changeattr(dir, &res->cinfo);
3433         return 1;
3434 }
3435
3436 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3437 {
3438         struct nfs_server *server = NFS_SERVER(dir);
3439         struct nfs_renameargs *arg = msg->rpc_argp;
3440         struct nfs_renameres *res = msg->rpc_resp;
3441
3442         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3443         res->server = server;
3444         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3445 }
3446
3447 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3448 {
3449         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3450                         &data->args.seq_args,
3451                         &data->res.seq_res,
3452                         task);
3453 }
3454
3455 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3456                                  struct inode *new_dir)
3457 {
3458         struct nfs_renamedata *data = task->tk_calldata;
3459         struct nfs_renameres *res = &data->res;
3460
3461         if (!nfs4_sequence_done(task, &res->seq_res))
3462                 return 0;
3463         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3464                 return 0;
3465
3466         update_changeattr(old_dir, &res->old_cinfo);
3467         update_changeattr(new_dir, &res->new_cinfo);
3468         return 1;
3469 }
3470
3471 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3472                 struct inode *new_dir, struct qstr *new_name)
3473 {
3474         struct nfs_server *server = NFS_SERVER(old_dir);
3475         struct nfs_renameargs arg = {
3476                 .old_dir = NFS_FH(old_dir),
3477                 .new_dir = NFS_FH(new_dir),
3478                 .old_name = old_name,
3479                 .new_name = new_name,
3480         };
3481         struct nfs_renameres res = {
3482                 .server = server,
3483         };
3484         struct rpc_message msg = {
3485                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3486                 .rpc_argp = &arg,
3487                 .rpc_resp = &res,
3488         };
3489         int status = -ENOMEM;
3490
3491         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3492         if (!status) {
3493                 update_changeattr(old_dir, &res.old_cinfo);
3494                 update_changeattr(new_dir, &res.new_cinfo);
3495         }
3496         return status;
3497 }
3498
3499 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3500                 struct inode *new_dir, struct qstr *new_name)
3501 {
3502         struct nfs4_exception exception = { };
3503         int err;
3504         do {
3505                 err = _nfs4_proc_rename(old_dir, old_name,
3506                                         new_dir, new_name);
3507                 trace_nfs4_rename(old_dir, old_name, new_dir, new_name, err);
3508                 err = nfs4_handle_exception(NFS_SERVER(old_dir), err,
3509                                 &exception);
3510         } while (exception.retry);
3511         return err;
3512 }
3513
3514 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3515 {
3516         struct nfs_server *server = NFS_SERVER(inode);
3517         struct nfs4_link_arg arg = {
3518                 .fh     = NFS_FH(inode),
3519                 .dir_fh = NFS_FH(dir),
3520                 .name   = name,
3521                 .bitmask = server->attr_bitmask,
3522         };
3523         struct nfs4_link_res res = {
3524                 .server = server,
3525                 .label = NULL,
3526         };
3527         struct rpc_message msg = {
3528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3529                 .rpc_argp = &arg,
3530                 .rpc_resp = &res,
3531         };
3532         int status = -ENOMEM;
3533
3534         res.fattr = nfs_alloc_fattr();
3535         if (res.fattr == NULL)
3536                 goto out;
3537
3538         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3539         if (IS_ERR(res.label)) {
3540                 status = PTR_ERR(res.label);
3541                 goto out;
3542         }
3543         arg.bitmask = nfs4_bitmask(server, res.label);
3544
3545         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3546         if (!status) {
3547                 update_changeattr(dir, &res.cinfo);
3548                 status = nfs_post_op_update_inode(inode, res.fattr);
3549                 if (!status)
3550                         nfs_setsecurity(inode, res.fattr, res.label);
3551         }
3552
3553
3554         nfs4_label_free(res.label);
3555
3556 out:
3557         nfs_free_fattr(res.fattr);
3558         return status;
3559 }
3560
3561 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3562 {
3563         struct nfs4_exception exception = { };
3564         int err;
3565         do {
3566                 err = nfs4_handle_exception(NFS_SERVER(inode),
3567                                 _nfs4_proc_link(inode, dir, name),
3568                                 &exception);
3569         } while (exception.retry);
3570         return err;
3571 }
3572
3573 struct nfs4_createdata {
3574         struct rpc_message msg;
3575         struct nfs4_create_arg arg;
3576         struct nfs4_create_res res;
3577         struct nfs_fh fh;
3578         struct nfs_fattr fattr;
3579         struct nfs4_label *label;
3580 };
3581
3582 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3583                 struct qstr *name, struct iattr *sattr, u32 ftype)
3584 {
3585         struct nfs4_createdata *data;
3586
3587         data = kzalloc(sizeof(*data), GFP_KERNEL);
3588         if (data != NULL) {
3589                 struct nfs_server *server = NFS_SERVER(dir);
3590
3591                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3592                 if (IS_ERR(data->label))
3593                         goto out_free;
3594
3595                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3596                 data->msg.rpc_argp = &data->arg;
3597                 data->msg.rpc_resp = &data->res;
3598                 data->arg.dir_fh = NFS_FH(dir);
3599                 data->arg.server = server;
3600                 data->arg.name = name;
3601                 data->arg.attrs = sattr;
3602                 data->arg.ftype = ftype;
3603                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3604                 data->res.server = server;
3605                 data->res.fh = &data->fh;
3606                 data->res.fattr = &data->fattr;
3607                 data->res.label = data->label;
3608                 nfs_fattr_init(data->res.fattr);
3609         }
3610         return data;
3611 out_free:
3612         kfree(data);
3613         return NULL;
3614 }
3615
3616 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3617 {
3618         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3619                                     &data->arg.seq_args, &data->res.seq_res, 1);
3620         if (status == 0) {
3621                 update_changeattr(dir, &data->res.dir_cinfo);
3622                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3623         }
3624         return status;
3625 }
3626
3627 static void nfs4_free_createdata(struct nfs4_createdata *data)
3628 {
3629         nfs4_label_free(data->label);
3630         kfree(data);
3631 }
3632
3633 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3634                 struct page *page, unsigned int len, struct iattr *sattr,
3635                 struct nfs4_label *label)
3636 {
3637         struct nfs4_createdata *data;
3638         int status = -ENAMETOOLONG;
3639
3640         if (len > NFS4_MAXPATHLEN)
3641                 goto out;
3642
3643         status = -ENOMEM;
3644         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3645         if (data == NULL)
3646                 goto out;
3647
3648         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3649         data->arg.u.symlink.pages = &page;
3650         data->arg.u.symlink.len = len;
3651         data->arg.label = label;
3652
3653         status = nfs4_do_create(dir, dentry, data);
3654
3655         nfs4_free_createdata(data);
3656 out:
3657         return status;
3658 }
3659
3660 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3661                 struct page *page, unsigned int len, struct iattr *sattr)
3662 {
3663         struct nfs4_exception exception = { };
3664         struct nfs4_label l, *label = NULL;
3665         int err;
3666
3667         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3668
3669         do {
3670                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3671                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3672                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3673                                 &exception);
3674         } while (exception.retry);
3675
3676         nfs4_label_release_security(label);
3677         return err;
3678 }
3679
3680 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3681                 struct iattr *sattr, struct nfs4_label *label)
3682 {
3683         struct nfs4_createdata *data;
3684         int status = -ENOMEM;
3685
3686         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3687         if (data == NULL)
3688                 goto out;
3689
3690         data->arg.label = label;
3691         status = nfs4_do_create(dir, dentry, data);
3692
3693         nfs4_free_createdata(data);
3694 out:
3695         return status;
3696 }
3697
3698 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3699                 struct iattr *sattr)
3700 {
3701         struct nfs4_exception exception = { };
3702         struct nfs4_label l, *label = NULL;
3703         int err;
3704
3705         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3706
3707         sattr->ia_mode &= ~current_umask();
3708         do {
3709                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3710                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3711                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3712                                 &exception);
3713         } while (exception.retry);
3714         nfs4_label_release_security(label);
3715
3716         return err;
3717 }
3718
3719 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3720                 u64 cookie, struct page **pages, unsigned int count, int plus)
3721 {
3722         struct inode            *dir = dentry->d_inode;
3723         struct nfs4_readdir_arg args = {
3724                 .fh = NFS_FH(dir),
3725                 .pages = pages,
3726                 .pgbase = 0,
3727                 .count = count,
3728                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3729                 .plus = plus,
3730         };
3731         struct nfs4_readdir_res res;
3732         struct rpc_message msg = {
3733                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3734                 .rpc_argp = &args,
3735                 .rpc_resp = &res,
3736                 .rpc_cred = cred,
3737         };
3738         int                     status;
3739
3740         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3741                         dentry->d_parent->d_name.name,
3742                         dentry->d_name.name,
3743                         (unsigned long long)cookie);
3744         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3745         res.pgbase = args.pgbase;
3746         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3747         if (status >= 0) {
3748                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3749                 status += args.pgbase;
3750         }
3751
3752         nfs_invalidate_atime(dir);
3753
3754         dprintk("%s: returns %d\n", __func__, status);
3755         return status;
3756 }
3757
3758 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3759                 u64 cookie, struct page **pages, unsigned int count, int plus)
3760 {
3761         struct nfs4_exception exception = { };
3762         int err;
3763         do {
3764                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3765                                 pages, count, plus);
3766                 trace_nfs4_readdir(dentry->d_inode, err);
3767                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
3768                                 &exception);
3769         } while (exception.retry);
3770         return err;
3771 }
3772
3773 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3774                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3775 {
3776         struct nfs4_createdata *data;
3777         int mode = sattr->ia_mode;
3778         int status = -ENOMEM;
3779
3780         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3781         if (data == NULL)
3782                 goto out;
3783
3784         if (S_ISFIFO(mode))
3785                 data->arg.ftype = NF4FIFO;
3786         else if (S_ISBLK(mode)) {
3787                 data->arg.ftype = NF4BLK;
3788                 data->arg.u.device.specdata1 = MAJOR(rdev);
3789                 data->arg.u.device.specdata2 = MINOR(rdev);
3790         }
3791         else if (S_ISCHR(mode)) {
3792                 data->arg.ftype = NF4CHR;
3793                 data->arg.u.device.specdata1 = MAJOR(rdev);
3794                 data->arg.u.device.specdata2 = MINOR(rdev);
3795         } else if (!S_ISSOCK(mode)) {
3796                 status = -EINVAL;
3797                 goto out_free;
3798         }
3799
3800         data->arg.label = label;
3801         status = nfs4_do_create(dir, dentry, data);
3802 out_free:
3803         nfs4_free_createdata(data);
3804 out:
3805         return status;
3806 }
3807
3808 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3809                 struct iattr *sattr, dev_t rdev)
3810 {
3811         struct nfs4_exception exception = { };
3812         struct nfs4_label l, *label = NULL;
3813         int err;
3814
3815         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3816
3817         sattr->ia_mode &= ~current_umask();
3818         do {
3819                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3820                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3821                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3822                                 &exception);
3823         } while (exception.retry);
3824
3825         nfs4_label_release_security(label);
3826
3827         return err;
3828 }
3829
3830 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3831                  struct nfs_fsstat *fsstat)
3832 {
3833         struct nfs4_statfs_arg args = {
3834                 .fh = fhandle,
3835                 .bitmask = server->attr_bitmask,
3836         };
3837         struct nfs4_statfs_res res = {
3838                 .fsstat = fsstat,
3839         };
3840         struct rpc_message msg = {
3841                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3842                 .rpc_argp = &args,
3843                 .rpc_resp = &res,
3844         };
3845
3846         nfs_fattr_init(fsstat->fattr);
3847         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3848 }
3849
3850 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3851 {
3852         struct nfs4_exception exception = { };
3853         int err;
3854         do {
3855                 err = nfs4_handle_exception(server,
3856                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3857                                 &exception);
3858         } while (exception.retry);
3859         return err;
3860 }
3861
3862 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3863                 struct nfs_fsinfo *fsinfo)
3864 {
3865         struct nfs4_fsinfo_arg args = {
3866                 .fh = fhandle,
3867                 .bitmask = server->attr_bitmask,
3868         };
3869         struct nfs4_fsinfo_res res = {
3870                 .fsinfo = fsinfo,
3871         };
3872         struct rpc_message msg = {
3873                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3874                 .rpc_argp = &args,
3875                 .rpc_resp = &res,
3876         };
3877
3878         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3879 }
3880
3881 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3882 {
3883         struct nfs4_exception exception = { };
3884         unsigned long now = jiffies;
3885         int err;
3886
3887         do {
3888                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
3889                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
3890                 if (err == 0) {
3891                         struct nfs_client *clp = server->nfs_client;
3892
3893                         spin_lock(&clp->cl_lock);
3894                         clp->cl_lease_time = fsinfo->lease_time * HZ;
3895                         clp->cl_last_renewal = now;
3896                         spin_unlock(&clp->cl_lock);
3897                         break;
3898                 }
3899                 err = nfs4_handle_exception(server, err, &exception);
3900         } while (exception.retry);
3901         return err;
3902 }
3903
3904 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3905 {
3906         int error;
3907
3908         nfs_fattr_init(fsinfo->fattr);
3909         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3910         if (error == 0) {
3911                 /* block layout checks this! */
3912                 server->pnfs_blksize = fsinfo->blksize;
3913                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3914         }
3915
3916         return error;
3917 }
3918
3919 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3920                 struct nfs_pathconf *pathconf)
3921 {
3922         struct nfs4_pathconf_arg args = {
3923                 .fh = fhandle,
3924                 .bitmask = server->attr_bitmask,
3925         };
3926         struct nfs4_pathconf_res res = {
3927                 .pathconf = pathconf,
3928         };
3929         struct rpc_message msg = {
3930                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3931                 .rpc_argp = &args,
3932                 .rpc_resp = &res,
3933         };
3934
3935         /* None of the pathconf attributes are mandatory to implement */
3936         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3937                 memset(pathconf, 0, sizeof(*pathconf));
3938                 return 0;
3939         }
3940
3941         nfs_fattr_init(pathconf->fattr);
3942         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3943 }
3944
3945 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3946                 struct nfs_pathconf *pathconf)
3947 {
3948         struct nfs4_exception exception = { };
3949         int err;
3950
3951         do {
3952                 err = nfs4_handle_exception(server,
3953                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3954                                 &exception);
3955         } while (exception.retry);
3956         return err;
3957 }
3958
3959 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
3960                 const struct nfs_open_context *ctx,
3961                 const struct nfs_lock_context *l_ctx,
3962                 fmode_t fmode)
3963 {
3964         const struct nfs_lockowner *lockowner = NULL;
3965
3966         if (l_ctx != NULL)
3967                 lockowner = &l_ctx->lockowner;
3968         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
3969 }
3970 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
3971
3972 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
3973                 const struct nfs_open_context *ctx,
3974                 const struct nfs_lock_context *l_ctx,
3975                 fmode_t fmode)
3976 {
3977         nfs4_stateid current_stateid;
3978
3979         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode))
3980                 return false;
3981         return nfs4_stateid_match(stateid, &current_stateid);
3982 }
3983
3984 static bool nfs4_error_stateid_expired(int err)
3985 {
3986         switch (err) {
3987         case -NFS4ERR_DELEG_REVOKED:
3988         case -NFS4ERR_ADMIN_REVOKED:
3989         case -NFS4ERR_BAD_STATEID:
3990         case -NFS4ERR_STALE_STATEID:
3991         case -NFS4ERR_OLD_STATEID:
3992         case -NFS4ERR_OPENMODE:
3993         case -NFS4ERR_EXPIRED:
3994                 return true;
3995         }
3996         return false;
3997 }
3998
3999 void __nfs4_read_done_cb(struct nfs_read_data *data)
4000 {
4001         nfs_invalidate_atime(data->header->inode);
4002 }
4003
4004 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
4005 {
4006         struct nfs_server *server = NFS_SERVER(data->header->inode);
4007
4008         trace_nfs4_read(data, task->tk_status);
4009         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
4010                 rpc_restart_call_prepare(task);
4011                 return -EAGAIN;
4012         }
4013
4014         __nfs4_read_done_cb(data);
4015         if (task->tk_status > 0)
4016                 renew_lease(server, data->timestamp);
4017         return 0;
4018 }
4019
4020 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4021                 struct nfs_readargs *args)
4022 {
4023
4024         if (!nfs4_error_stateid_expired(task->tk_status) ||
4025                 nfs4_stateid_is_current(&args->stateid,
4026                                 args->context,
4027                                 args->lock_context,
4028                                 FMODE_READ))
4029                 return false;
4030         rpc_restart_call_prepare(task);
4031         return true;
4032 }
4033
4034 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
4035 {
4036
4037         dprintk("--> %s\n", __func__);
4038
4039         if (!nfs4_sequence_done(task, &data->res.seq_res))
4040                 return -EAGAIN;
4041         if (nfs4_read_stateid_changed(task, &data->args))
4042                 return -EAGAIN;
4043         return data->read_done_cb ? data->read_done_cb(task, data) :
4044                                     nfs4_read_done_cb(task, data);
4045 }
4046
4047 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
4048 {
4049         data->timestamp   = jiffies;
4050         data->read_done_cb = nfs4_read_done_cb;
4051         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4052         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
4053 }
4054
4055 static int nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
4056 {
4057         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4058                         &data->args.seq_args,
4059                         &data->res.seq_res,
4060                         task))
4061                 return 0;
4062         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4063                                 data->args.lock_context, FMODE_READ) == -EIO)
4064                 return -EIO;
4065         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4066                 return -EIO;
4067         return 0;
4068 }
4069
4070 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
4071 {
4072         struct inode *inode = data->header->inode;
4073
4074         trace_nfs4_write(data, task->tk_status);
4075         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
4076                 rpc_restart_call_prepare(task);
4077                 return -EAGAIN;
4078         }
4079         if (task->tk_status >= 0) {
4080                 renew_lease(NFS_SERVER(inode), data->timestamp);
4081                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4082         }
4083         return 0;
4084 }
4085
4086 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4087                 struct nfs_writeargs *args)
4088 {
4089
4090         if (!nfs4_error_stateid_expired(task->tk_status) ||
4091                 nfs4_stateid_is_current(&args->stateid,
4092                                 args->context,
4093                                 args->lock_context,
4094                                 FMODE_WRITE))
4095                 return false;
4096         rpc_restart_call_prepare(task);
4097         return true;
4098 }
4099
4100 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
4101 {
4102         if (!nfs4_sequence_done(task, &data->res.seq_res))
4103                 return -EAGAIN;
4104         if (nfs4_write_stateid_changed(task, &data->args))
4105                 return -EAGAIN;
4106         return data->write_done_cb ? data->write_done_cb(task, data) :
4107                 nfs4_write_done_cb(task, data);
4108 }
4109
4110 static
4111 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
4112 {
4113         const struct nfs_pgio_header *hdr = data->header;
4114
4115         /* Don't request attributes for pNFS or O_DIRECT writes */
4116         if (data->ds_clp != NULL || hdr->dreq != NULL)
4117                 return false;
4118         /* Otherwise, request attributes if and only if we don't hold
4119          * a delegation
4120          */
4121         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4122 }
4123
4124 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
4125 {
4126         struct nfs_server *server = NFS_SERVER(data->header->inode);
4127
4128         if (!nfs4_write_need_cache_consistency_data(data)) {
4129                 data->args.bitmask = NULL;
4130                 data->res.fattr = NULL;
4131         } else
4132                 data->args.bitmask = server->cache_consistency_bitmask;
4133
4134         if (!data->write_done_cb)
4135                 data->write_done_cb = nfs4_write_done_cb;
4136         data->res.server = server;
4137         data->timestamp   = jiffies;
4138
4139         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4140         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4141 }
4142
4143 static int nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
4144 {
4145         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
4146                         &data->args.seq_args,
4147                         &data->res.seq_res,
4148                         task))
4149                 return 0;
4150         if (nfs4_set_rw_stateid(&data->args.stateid, data->args.context,
4151                                 data->args.lock_context, FMODE_WRITE) == -EIO)
4152                 return -EIO;
4153         if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
4154                 return -EIO;
4155         return 0;
4156 }
4157
4158 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4159 {
4160         nfs4_setup_sequence(NFS_SERVER(data->inode),
4161                         &data->args.seq_args,
4162                         &data->res.seq_res,
4163                         task);
4164 }
4165
4166 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4167 {
4168         struct inode *inode = data->inode;
4169
4170         trace_nfs4_commit(data, task->tk_status);
4171         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
4172                 rpc_restart_call_prepare(task);
4173                 return -EAGAIN;
4174         }
4175         return 0;
4176 }
4177
4178 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4179 {
4180         if (!nfs4_sequence_done(task, &data->res.seq_res))
4181                 return -EAGAIN;
4182         return data->commit_done_cb(task, data);
4183 }
4184
4185 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4186 {
4187         struct nfs_server *server = NFS_SERVER(data->inode);
4188
4189         if (data->commit_done_cb == NULL)
4190                 data->commit_done_cb = nfs4_commit_done_cb;
4191         data->res.server = server;
4192         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4193         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4194 }
4195
4196 struct nfs4_renewdata {
4197         struct nfs_client       *client;
4198         unsigned long           timestamp;
4199 };
4200
4201 /*
4202  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4203  * standalone procedure for queueing an asynchronous RENEW.
4204  */
4205 static void nfs4_renew_release(void *calldata)
4206 {
4207         struct nfs4_renewdata *data = calldata;
4208         struct nfs_client *clp = data->client;
4209
4210         if (atomic_read(&clp->cl_count) > 1)
4211                 nfs4_schedule_state_renewal(clp);
4212         nfs_put_client(clp);
4213         kfree(data);
4214 }
4215
4216 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4217 {
4218         struct nfs4_renewdata *data = calldata;
4219         struct nfs_client *clp = data->client;
4220         unsigned long timestamp = data->timestamp;
4221
4222         trace_nfs4_renew_async(clp, task->tk_status);
4223         if (task->tk_status < 0) {
4224                 /* Unless we're shutting down, schedule state recovery! */
4225                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4226                         return;
4227                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4228                         nfs4_schedule_lease_recovery(clp);
4229                         return;
4230                 }
4231                 nfs4_schedule_path_down_recovery(clp);
4232         }
4233         do_renew_lease(clp, timestamp);
4234 }
4235
4236 static const struct rpc_call_ops nfs4_renew_ops = {
4237         .rpc_call_done = nfs4_renew_done,
4238         .rpc_release = nfs4_renew_release,
4239 };
4240
4241 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4242 {
4243         struct rpc_message msg = {
4244                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4245                 .rpc_argp       = clp,
4246                 .rpc_cred       = cred,
4247         };
4248         struct nfs4_renewdata *data;
4249
4250         if (renew_flags == 0)
4251                 return 0;
4252         if (!atomic_inc_not_zero(&clp->cl_count))
4253                 return -EIO;
4254         data = kmalloc(sizeof(*data), GFP_NOFS);
4255         if (data == NULL)
4256                 return -ENOMEM;
4257         data->client = clp;
4258         data->timestamp = jiffies;
4259         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4260                         &nfs4_renew_ops, data);
4261 }
4262
4263 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4264 {
4265         struct rpc_message msg = {
4266                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4267                 .rpc_argp       = clp,
4268                 .rpc_cred       = cred,
4269         };
4270         unsigned long now = jiffies;
4271         int status;
4272
4273         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4274         if (status < 0)
4275                 return status;
4276         do_renew_lease(clp, now);
4277         return 0;
4278 }
4279
4280 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4281 {
4282         return (server->caps & NFS_CAP_ACLS)
4283                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
4284                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
4285 }
4286
4287 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4288  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4289  * the stack.
4290  */
4291 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4292
4293 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4294                 struct page **pages, unsigned int *pgbase)
4295 {
4296         struct page *newpage, **spages;
4297         int rc = 0;
4298         size_t len;
4299         spages = pages;
4300
4301         do {
4302                 len = min_t(size_t, PAGE_SIZE, buflen);
4303                 newpage = alloc_page(GFP_KERNEL);
4304
4305                 if (newpage == NULL)
4306                         goto unwind;
4307                 memcpy(page_address(newpage), buf, len);
4308                 buf += len;
4309                 buflen -= len;
4310                 *pages++ = newpage;
4311                 rc++;
4312         } while (buflen != 0);
4313
4314         return rc;
4315
4316 unwind:
4317         for(; rc > 0; rc--)
4318                 __free_page(spages[rc-1]);
4319         return -ENOMEM;
4320 }
4321
4322 struct nfs4_cached_acl {
4323         int cached;
4324         size_t len;
4325         char data[0];
4326 };
4327
4328 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4329 {
4330         struct nfs_inode *nfsi = NFS_I(inode);
4331
4332         spin_lock(&inode->i_lock);
4333         kfree(nfsi->nfs4_acl);
4334         nfsi->nfs4_acl = acl;
4335         spin_unlock(&inode->i_lock);
4336 }
4337
4338 static void nfs4_zap_acl_attr(struct inode *inode)
4339 {
4340         nfs4_set_cached_acl(inode, NULL);
4341 }
4342
4343 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4344 {
4345         struct nfs_inode *nfsi = NFS_I(inode);
4346         struct nfs4_cached_acl *acl;
4347         int ret = -ENOENT;
4348
4349         spin_lock(&inode->i_lock);
4350         acl = nfsi->nfs4_acl;
4351         if (acl == NULL)
4352                 goto out;
4353         if (buf == NULL) /* user is just asking for length */
4354                 goto out_len;
4355         if (acl->cached == 0)
4356                 goto out;
4357         ret = -ERANGE; /* see getxattr(2) man page */
4358         if (acl->len > buflen)
4359                 goto out;
4360         memcpy(buf, acl->data, acl->len);
4361 out_len:
4362         ret = acl->len;
4363 out:
4364         spin_unlock(&inode->i_lock);
4365         return ret;
4366 }
4367
4368 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4369 {
4370         struct nfs4_cached_acl *acl;
4371         size_t buflen = sizeof(*acl) + acl_len;
4372
4373         if (buflen <= PAGE_SIZE) {
4374                 acl = kmalloc(buflen, GFP_KERNEL);
4375                 if (acl == NULL)
4376                         goto out;
4377                 acl->cached = 1;
4378                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4379         } else {
4380                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4381                 if (acl == NULL)
4382                         goto out;
4383                 acl->cached = 0;
4384         }
4385         acl->len = acl_len;
4386 out:
4387         nfs4_set_cached_acl(inode, acl);
4388 }
4389
4390 /*
4391  * The getxattr API returns the required buffer length when called with a
4392  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4393  * the required buf.  On a NULL buf, we send a page of data to the server
4394  * guessing that the ACL request can be serviced by a page. If so, we cache
4395  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4396  * the cache. If not so, we throw away the page, and cache the required
4397  * length. The next getxattr call will then produce another round trip to
4398  * the server, this time with the input buf of the required size.
4399  */
4400 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4401 {
4402         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4403         struct nfs_getaclargs args = {
4404                 .fh = NFS_FH(inode),
4405                 .acl_pages = pages,
4406                 .acl_len = buflen,
4407         };
4408         struct nfs_getaclres res = {
4409                 .acl_len = buflen,
4410         };
4411         struct rpc_message msg = {
4412                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4413                 .rpc_argp = &args,
4414                 .rpc_resp = &res,
4415         };
4416         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4417         int ret = -ENOMEM, i;
4418
4419         /* As long as we're doing a round trip to the server anyway,
4420          * let's be prepared for a page of acl data. */
4421         if (npages == 0)
4422                 npages = 1;
4423         if (npages > ARRAY_SIZE(pages))
4424                 return -ERANGE;
4425
4426         for (i = 0; i < npages; i++) {
4427                 pages[i] = alloc_page(GFP_KERNEL);
4428                 if (!pages[i])
4429                         goto out_free;
4430         }
4431
4432         /* for decoding across pages */
4433         res.acl_scratch = alloc_page(GFP_KERNEL);
4434         if (!res.acl_scratch)
4435                 goto out_free;
4436
4437         args.acl_len = npages * PAGE_SIZE;
4438         args.acl_pgbase = 0;
4439
4440         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4441                 __func__, buf, buflen, npages, args.acl_len);
4442         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4443                              &msg, &args.seq_args, &res.seq_res, 0);
4444         if (ret)
4445                 goto out_free;
4446
4447         /* Handle the case where the passed-in buffer is too short */
4448         if (res.acl_flags & NFS4_ACL_TRUNC) {
4449                 /* Did the user only issue a request for the acl length? */
4450                 if (buf == NULL)
4451                         goto out_ok;
4452                 ret = -ERANGE;
4453                 goto out_free;
4454         }
4455         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4456         if (buf) {
4457                 if (res.acl_len > buflen) {
4458                         ret = -ERANGE;
4459                         goto out_free;
4460                 }
4461                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4462         }
4463 out_ok:
4464         ret = res.acl_len;
4465 out_free:
4466         for (i = 0; i < npages; i++)
4467                 if (pages[i])
4468                         __free_page(pages[i]);
4469         if (res.acl_scratch)
4470                 __free_page(res.acl_scratch);
4471         return ret;
4472 }
4473
4474 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4475 {
4476         struct nfs4_exception exception = { };
4477         ssize_t ret;
4478         do {
4479                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4480                 trace_nfs4_get_acl(inode, ret);
4481                 if (ret >= 0)
4482                         break;
4483                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4484         } while (exception.retry);
4485         return ret;
4486 }
4487
4488 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4489 {
4490         struct nfs_server *server = NFS_SERVER(inode);
4491         int ret;
4492
4493         if (!nfs4_server_supports_acls(server))
4494                 return -EOPNOTSUPP;
4495         ret = nfs_revalidate_inode(server, inode);
4496         if (ret < 0)
4497                 return ret;
4498         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4499                 nfs_zap_acl_cache(inode);
4500         ret = nfs4_read_cached_acl(inode, buf, buflen);
4501         if (ret != -ENOENT)
4502                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4503                  * but no cached acl data, just the acl length */
4504                 return ret;
4505         return nfs4_get_acl_uncached(inode, buf, buflen);
4506 }
4507
4508 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4509 {
4510         struct nfs_server *server = NFS_SERVER(inode);
4511         struct page *pages[NFS4ACL_MAXPAGES];
4512         struct nfs_setaclargs arg = {
4513                 .fh             = NFS_FH(inode),
4514                 .acl_pages      = pages,
4515                 .acl_len        = buflen,
4516         };
4517         struct nfs_setaclres res;
4518         struct rpc_message msg = {
4519                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4520                 .rpc_argp       = &arg,
4521                 .rpc_resp       = &res,
4522         };
4523         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4524         int ret, i;
4525
4526         if (!nfs4_server_supports_acls(server))
4527                 return -EOPNOTSUPP;
4528         if (npages > ARRAY_SIZE(pages))
4529                 return -ERANGE;
4530         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4531         if (i < 0)
4532                 return i;
4533         nfs4_inode_return_delegation(inode);
4534         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4535
4536         /*
4537          * Free each page after tx, so the only ref left is
4538          * held by the network stack
4539          */
4540         for (; i > 0; i--)
4541                 put_page(pages[i-1]);
4542
4543         /*
4544          * Acl update can result in inode attribute update.
4545          * so mark the attribute cache invalid.
4546          */
4547         spin_lock(&inode->i_lock);
4548         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4549         spin_unlock(&inode->i_lock);
4550         nfs_access_zap_cache(inode);
4551         nfs_zap_acl_cache(inode);
4552         return ret;
4553 }
4554
4555 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4556 {
4557         struct nfs4_exception exception = { };
4558         int err;
4559         do {
4560                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4561                 trace_nfs4_set_acl(inode, err);
4562                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4563                                 &exception);
4564         } while (exception.retry);
4565         return err;
4566 }
4567
4568 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4569 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4570                                         size_t buflen)
4571 {
4572         struct nfs_server *server = NFS_SERVER(inode);
4573         struct nfs_fattr fattr;
4574         struct nfs4_label label = {0, 0, buflen, buf};
4575
4576         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4577         struct nfs4_getattr_arg args = {
4578                 .fh             = NFS_FH(inode),
4579                 .bitmask        = bitmask,
4580         };
4581         struct nfs4_getattr_res res = {
4582                 .fattr          = &fattr,
4583                 .label          = &label,
4584                 .server         = server,
4585         };
4586         struct rpc_message msg = {
4587                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4588                 .rpc_argp       = &args,
4589                 .rpc_resp       = &res,
4590         };
4591         int ret;
4592
4593         nfs_fattr_init(&fattr);
4594
4595         ret = rpc_call_sync(server->client, &msg, 0);
4596         if (ret)
4597                 return ret;
4598         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4599                 return -ENOENT;
4600         if (buflen < label.len)
4601                 return -ERANGE;
4602         return 0;
4603 }
4604
4605 static int nfs4_get_security_label(struct inode *inode, void *buf,
4606                                         size_t buflen)
4607 {
4608         struct nfs4_exception exception = { };
4609         int err;
4610
4611         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4612                 return -EOPNOTSUPP;
4613
4614         do {
4615                 err = _nfs4_get_security_label(inode, buf, buflen);
4616                 trace_nfs4_get_security_label(inode, err);
4617                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4618                                 &exception);
4619         } while (exception.retry);
4620         return err;
4621 }
4622
4623 static int _nfs4_do_set_security_label(struct inode *inode,
4624                 struct nfs4_label *ilabel,
4625                 struct nfs_fattr *fattr,
4626                 struct nfs4_label *olabel)
4627 {
4628
4629         struct iattr sattr = {0};
4630         struct nfs_server *server = NFS_SERVER(inode);
4631         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4632         struct nfs_setattrargs args = {
4633                 .fh             = NFS_FH(inode),
4634                 .iap            = &sattr,
4635                 .server         = server,
4636                 .bitmask        = bitmask,
4637                 .label          = ilabel,
4638         };
4639         struct nfs_setattrres res = {
4640                 .fattr          = fattr,
4641                 .label          = olabel,
4642                 .server         = server,
4643         };
4644         struct rpc_message msg = {
4645                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4646                 .rpc_argp       = &args,
4647                 .rpc_resp       = &res,
4648         };
4649         int status;
4650
4651         nfs4_stateid_copy(&args.stateid, &zero_stateid);
4652
4653         status = rpc_call_sync(server->client, &msg, 0);
4654         if (status)
4655                 dprintk("%s failed: %d\n", __func__, status);
4656
4657         return status;
4658 }
4659
4660 static int nfs4_do_set_security_label(struct inode *inode,
4661                 struct nfs4_label *ilabel,
4662                 struct nfs_fattr *fattr,
4663                 struct nfs4_label *olabel)
4664 {
4665         struct nfs4_exception exception = { };
4666         int err;
4667
4668         do {
4669                 err = _nfs4_do_set_security_label(inode, ilabel,
4670                                 fattr, olabel);
4671                 trace_nfs4_set_security_label(inode, err);
4672                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4673                                 &exception);
4674         } while (exception.retry);
4675         return err;
4676 }
4677
4678 static int
4679 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4680 {
4681         struct nfs4_label ilabel, *olabel = NULL;
4682         struct nfs_fattr fattr;
4683         struct rpc_cred *cred;
4684         struct inode *inode = dentry->d_inode;
4685         int status;
4686
4687         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4688                 return -EOPNOTSUPP;
4689
4690         nfs_fattr_init(&fattr);
4691
4692         ilabel.pi = 0;
4693         ilabel.lfs = 0;
4694         ilabel.label = (char *)buf;
4695         ilabel.len = buflen;
4696
4697         cred = rpc_lookup_cred();
4698         if (IS_ERR(cred))
4699                 return PTR_ERR(cred);
4700
4701         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4702         if (IS_ERR(olabel)) {
4703                 status = -PTR_ERR(olabel);
4704                 goto out;
4705         }
4706
4707         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4708         if (status == 0)
4709                 nfs_setsecurity(inode, &fattr, olabel);
4710
4711         nfs4_label_free(olabel);
4712 out:
4713         put_rpccred(cred);
4714         return status;
4715 }
4716 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4717
4718
4719 static int
4720 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4721 {
4722         struct nfs_client *clp = server->nfs_client;
4723
4724         if (task->tk_status >= 0)
4725                 return 0;
4726         switch(task->tk_status) {
4727                 case -NFS4ERR_DELEG_REVOKED:
4728                 case -NFS4ERR_ADMIN_REVOKED:
4729                 case -NFS4ERR_BAD_STATEID:
4730                         if (state == NULL)
4731                                 break;
4732                         nfs_remove_bad_delegation(state->inode);
4733                 case -NFS4ERR_OPENMODE:
4734                         if (state == NULL)
4735                                 break;
4736                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4737                                 goto stateid_invalid;
4738                         goto wait_on_recovery;
4739                 case -NFS4ERR_EXPIRED:
4740                         if (state != NULL) {
4741                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4742                                         goto stateid_invalid;
4743                         }
4744                 case -NFS4ERR_STALE_STATEID:
4745                 case -NFS4ERR_STALE_CLIENTID:
4746                         nfs4_schedule_lease_recovery(clp);
4747                         goto wait_on_recovery;
4748 #if defined(CONFIG_NFS_V4_1)
4749                 case -NFS4ERR_BADSESSION:
4750                 case -NFS4ERR_BADSLOT:
4751                 case -NFS4ERR_BAD_HIGH_SLOT:
4752                 case -NFS4ERR_DEADSESSION:
4753                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4754                 case -NFS4ERR_SEQ_FALSE_RETRY:
4755                 case -NFS4ERR_SEQ_MISORDERED:
4756                         dprintk("%s ERROR %d, Reset session\n", __func__,
4757                                 task->tk_status);
4758                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4759                         task->tk_status = 0;
4760                         return -EAGAIN;
4761 #endif /* CONFIG_NFS_V4_1 */
4762                 case -NFS4ERR_DELAY:
4763                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4764                 case -NFS4ERR_GRACE:
4765                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4766                         task->tk_status = 0;
4767                         return -EAGAIN;
4768                 case -NFS4ERR_RETRY_UNCACHED_REP:
4769                 case -NFS4ERR_OLD_STATEID:
4770                         task->tk_status = 0;
4771                         return -EAGAIN;
4772         }
4773         task->tk_status = nfs4_map_errors(task->tk_status);
4774         return 0;
4775 stateid_invalid:
4776         task->tk_status = -EIO;
4777         return 0;
4778 wait_on_recovery:
4779         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4780         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4781                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4782         task->tk_status = 0;
4783         return -EAGAIN;
4784 }
4785
4786 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4787                                     nfs4_verifier *bootverf)
4788 {
4789         __be32 verf[2];
4790
4791         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4792                 /* An impossible timestamp guarantees this value
4793                  * will never match a generated boot time. */
4794                 verf[0] = 0;
4795                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4796         } else {
4797                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4798                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4799                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4800         }
4801         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4802 }
4803
4804 static unsigned int
4805 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4806                                    char *buf, size_t len)
4807 {
4808         unsigned int result;
4809
4810         rcu_read_lock();
4811         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4812                                 clp->cl_ipaddr,
4813                                 rpc_peeraddr2str(clp->cl_rpcclient,
4814                                                         RPC_DISPLAY_ADDR),
4815                                 rpc_peeraddr2str(clp->cl_rpcclient,
4816                                                         RPC_DISPLAY_PROTO));
4817         rcu_read_unlock();
4818         return result;
4819 }
4820
4821 static unsigned int
4822 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4823                                 char *buf, size_t len)
4824 {
4825         const char *nodename = clp->cl_rpcclient->cl_nodename;
4826
4827         if (nfs4_client_id_uniquifier[0] != '\0')
4828                 return scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4829                                 clp->rpc_ops->version,
4830                                 clp->cl_minorversion,
4831                                 nfs4_client_id_uniquifier,
4832                                 nodename);
4833         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4834                                 clp->rpc_ops->version, clp->cl_minorversion,
4835                                 nodename);
4836 }
4837
4838 /**
4839  * nfs4_proc_setclientid - Negotiate client ID
4840  * @clp: state data structure
4841  * @program: RPC program for NFSv4 callback service
4842  * @port: IP port number for NFS4 callback service
4843  * @cred: RPC credential to use for this call
4844  * @res: where to place the result
4845  *
4846  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4847  */
4848 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4849                 unsigned short port, struct rpc_cred *cred,
4850                 struct nfs4_setclientid_res *res)
4851 {
4852         nfs4_verifier sc_verifier;
4853         struct nfs4_setclientid setclientid = {
4854                 .sc_verifier = &sc_verifier,
4855                 .sc_prog = program,
4856                 .sc_cb_ident = clp->cl_cb_ident,
4857         };
4858         struct rpc_message msg = {
4859                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4860                 .rpc_argp = &setclientid,
4861                 .rpc_resp = res,
4862                 .rpc_cred = cred,
4863         };
4864         int status;
4865
4866         /* nfs_client_id4 */
4867         nfs4_init_boot_verifier(clp, &sc_verifier);
4868         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4869                 setclientid.sc_name_len =
4870                                 nfs4_init_uniform_client_string(clp,
4871                                                 setclientid.sc_name,
4872                                                 sizeof(setclientid.sc_name));
4873         else
4874                 setclientid.sc_name_len =
4875                                 nfs4_init_nonuniform_client_string(clp,
4876                                                 setclientid.sc_name,
4877                                                 sizeof(setclientid.sc_name));
4878         /* cb_client4 */
4879         rcu_read_lock();
4880         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4881                                 sizeof(setclientid.sc_netid), "%s",
4882                                 rpc_peeraddr2str(clp->cl_rpcclient,
4883                                                         RPC_DISPLAY_NETID));
4884         rcu_read_unlock();
4885         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4886                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4887                                 clp->cl_ipaddr, port >> 8, port & 255);
4888
4889         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4890                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4891                 setclientid.sc_name_len, setclientid.sc_name);
4892         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4893         trace_nfs4_setclientid(clp, status);
4894         dprintk("NFS reply setclientid: %d\n", status);
4895         return status;
4896 }
4897
4898 /**
4899  * nfs4_proc_setclientid_confirm - Confirm client ID
4900  * @clp: state data structure
4901  * @res: result of a previous SETCLIENTID
4902  * @cred: RPC credential to use for this call
4903  *
4904  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4905  */
4906 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4907                 struct nfs4_setclientid_res *arg,
4908                 struct rpc_cred *cred)
4909 {
4910         struct rpc_message msg = {
4911                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4912                 .rpc_argp = arg,
4913                 .rpc_cred = cred,
4914         };
4915         int status;
4916
4917         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4918                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4919                 clp->cl_clientid);
4920         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4921         trace_nfs4_setclientid_confirm(clp, status);
4922         dprintk("NFS reply setclientid_confirm: %d\n", status);
4923         return status;
4924 }
4925
4926 struct nfs4_delegreturndata {
4927         struct nfs4_delegreturnargs args;
4928         struct nfs4_delegreturnres res;
4929         struct nfs_fh fh;
4930         nfs4_stateid stateid;
4931         unsigned long timestamp;
4932         struct nfs_fattr fattr;
4933         int rpc_status;
4934 };
4935
4936 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4937 {
4938         struct nfs4_delegreturndata *data = calldata;
4939
4940         if (!nfs4_sequence_done(task, &data->res.seq_res))
4941                 return;
4942
4943         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
4944         switch (task->tk_status) {
4945         case -NFS4ERR_STALE_STATEID:
4946         case -NFS4ERR_EXPIRED:
4947         case 0:
4948                 renew_lease(data->res.server, data->timestamp);
4949                 break;
4950         default:
4951                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4952                                 -EAGAIN) {
4953                         rpc_restart_call_prepare(task);
4954                         return;
4955                 }
4956         }
4957         data->rpc_status = task->tk_status;
4958 }
4959
4960 static void nfs4_delegreturn_release(void *calldata)
4961 {
4962         kfree(calldata);
4963 }
4964
4965 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4966 {
4967         struct nfs4_delegreturndata *d_data;
4968
4969         d_data = (struct nfs4_delegreturndata *)data;
4970
4971         nfs4_setup_sequence(d_data->res.server,
4972                         &d_data->args.seq_args,
4973                         &d_data->res.seq_res,
4974                         task);
4975 }
4976
4977 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4978         .rpc_call_prepare = nfs4_delegreturn_prepare,
4979         .rpc_call_done = nfs4_delegreturn_done,
4980         .rpc_release = nfs4_delegreturn_release,
4981 };
4982
4983 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4984 {
4985         struct nfs4_delegreturndata *data;
4986         struct nfs_server *server = NFS_SERVER(inode);
4987         struct rpc_task *task;
4988         struct rpc_message msg = {
4989                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4990                 .rpc_cred = cred,
4991         };
4992         struct rpc_task_setup task_setup_data = {
4993                 .rpc_client = server->client,
4994                 .rpc_message = &msg,
4995                 .callback_ops = &nfs4_delegreturn_ops,
4996                 .flags = RPC_TASK_ASYNC,
4997         };
4998         int status = 0;
4999
5000         data = kzalloc(sizeof(*data), GFP_NOFS);
5001         if (data == NULL)
5002                 return -ENOMEM;
5003         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5004         data->args.fhandle = &data->fh;
5005         data->args.stateid = &data->stateid;
5006         data->args.bitmask = server->cache_consistency_bitmask;
5007         nfs_copy_fh(&data->fh, NFS_FH(inode));
5008         nfs4_stateid_copy(&data->stateid, stateid);
5009         data->res.fattr = &data->fattr;
5010         data->res.server = server;
5011         nfs_fattr_init(data->res.fattr);
5012         data->timestamp = jiffies;
5013         data->rpc_status = 0;
5014
5015         task_setup_data.callback_data = data;
5016         msg.rpc_argp = &data->args;
5017         msg.rpc_resp = &data->res;
5018         task = rpc_run_task(&task_setup_data);
5019         if (IS_ERR(task))
5020                 return PTR_ERR(task);
5021         if (!issync)
5022                 goto out;
5023         status = nfs4_wait_for_completion_rpc_task(task);
5024         if (status != 0)
5025                 goto out;
5026         status = data->rpc_status;
5027         if (status == 0)
5028                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5029         else
5030                 nfs_refresh_inode(inode, &data->fattr);
5031 out:
5032         rpc_put_task(task);
5033         return status;
5034 }
5035
5036 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5037 {
5038         struct nfs_server *server = NFS_SERVER(inode);
5039         struct nfs4_exception exception = { };
5040         int err;
5041         do {
5042                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5043                 trace_nfs4_delegreturn(inode, err);
5044                 switch (err) {
5045                         case -NFS4ERR_STALE_STATEID:
5046                         case -NFS4ERR_EXPIRED:
5047                         case 0:
5048                                 return 0;
5049                 }
5050                 err = nfs4_handle_exception(server, err, &exception);
5051         } while (exception.retry);
5052         return err;
5053 }
5054
5055 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5056 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5057
5058 /*
5059  * sleep, with exponential backoff, and retry the LOCK operation.
5060  */
5061 static unsigned long
5062 nfs4_set_lock_task_retry(unsigned long timeout)
5063 {
5064         freezable_schedule_timeout_killable_unsafe(timeout);
5065         timeout <<= 1;
5066         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5067                 return NFS4_LOCK_MAXTIMEOUT;
5068         return timeout;
5069 }
5070
5071 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5072 {
5073         struct inode *inode = state->inode;
5074         struct nfs_server *server = NFS_SERVER(inode);
5075         struct nfs_client *clp = server->nfs_client;
5076         struct nfs_lockt_args arg = {
5077                 .fh = NFS_FH(inode),
5078                 .fl = request,
5079         };
5080         struct nfs_lockt_res res = {
5081                 .denied = request,
5082         };
5083         struct rpc_message msg = {
5084                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5085                 .rpc_argp       = &arg,
5086                 .rpc_resp       = &res,
5087                 .rpc_cred       = state->owner->so_cred,
5088         };
5089         struct nfs4_lock_state *lsp;
5090         int status;
5091
5092         arg.lock_owner.clientid = clp->cl_clientid;
5093         status = nfs4_set_lock_state(state, request);
5094         if (status != 0)
5095                 goto out;
5096         lsp = request->fl_u.nfs4_fl.owner;
5097         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5098         arg.lock_owner.s_dev = server->s_dev;
5099         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5100         switch (status) {
5101                 case 0:
5102                         request->fl_type = F_UNLCK;
5103                         break;
5104                 case -NFS4ERR_DENIED:
5105                         status = 0;
5106         }
5107         request->fl_ops->fl_release_private(request);
5108         request->fl_ops = NULL;
5109 out:
5110         return status;
5111 }
5112
5113 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5114 {
5115         struct nfs4_exception exception = { };
5116         int err;
5117
5118         do {
5119                 err = _nfs4_proc_getlk(state, cmd, request);
5120                 trace_nfs4_get_lock(request, state, cmd, err);
5121                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5122                                 &exception);
5123         } while (exception.retry);
5124         return err;
5125 }
5126
5127 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5128 {
5129         int res = 0;
5130         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5131                 case FL_POSIX:
5132                         res = posix_lock_file_wait(file, fl);
5133                         break;
5134                 case FL_FLOCK:
5135                         res = flock_lock_file_wait(file, fl);
5136                         break;
5137                 default:
5138                         BUG();
5139         }
5140         return res;
5141 }
5142
5143 struct nfs4_unlockdata {
5144         struct nfs_locku_args arg;
5145         struct nfs_locku_res res;
5146         struct nfs4_lock_state *lsp;
5147         struct nfs_open_context *ctx;
5148         struct file_lock fl;
5149         const struct nfs_server *server;
5150         unsigned long timestamp;
5151 };
5152
5153 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5154                 struct nfs_open_context *ctx,
5155                 struct nfs4_lock_state *lsp,
5156                 struct nfs_seqid *seqid)
5157 {
5158         struct nfs4_unlockdata *p;
5159         struct inode *inode = lsp->ls_state->inode;
5160
5161         p = kzalloc(sizeof(*p), GFP_NOFS);
5162         if (p == NULL)
5163                 return NULL;
5164         p->arg.fh = NFS_FH(inode);
5165         p->arg.fl = &p->fl;
5166         p->arg.seqid = seqid;
5167         p->res.seqid = seqid;
5168         p->arg.stateid = &lsp->ls_stateid;
5169         p->lsp = lsp;
5170         atomic_inc(&lsp->ls_count);
5171         /* Ensure we don't close file until we're done freeing locks! */
5172         p->ctx = get_nfs_open_context(ctx);
5173         memcpy(&p->fl, fl, sizeof(p->fl));
5174         p->server = NFS_SERVER(inode);
5175         return p;
5176 }
5177
5178 static void nfs4_locku_release_calldata(void *data)
5179 {
5180         struct nfs4_unlockdata *calldata = data;
5181         nfs_free_seqid(calldata->arg.seqid);
5182         nfs4_put_lock_state(calldata->lsp);
5183         put_nfs_open_context(calldata->ctx);
5184         kfree(calldata);
5185 }
5186
5187 static void nfs4_locku_done(struct rpc_task *task, void *data)
5188 {
5189         struct nfs4_unlockdata *calldata = data;
5190
5191         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5192                 return;
5193         switch (task->tk_status) {
5194                 case 0:
5195                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
5196                                         &calldata->res.stateid);
5197                         renew_lease(calldata->server, calldata->timestamp);
5198                         break;
5199                 case -NFS4ERR_BAD_STATEID:
5200                 case -NFS4ERR_OLD_STATEID:
5201                 case -NFS4ERR_STALE_STATEID:
5202                 case -NFS4ERR_EXPIRED:
5203                         break;
5204                 default:
5205                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
5206                                 rpc_restart_call_prepare(task);
5207         }
5208         nfs_release_seqid(calldata->arg.seqid);
5209 }
5210
5211 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5212 {
5213         struct nfs4_unlockdata *calldata = data;
5214
5215         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5216                 goto out_wait;
5217         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5218                 /* Note: exit _without_ running nfs4_locku_done */
5219                 goto out_no_action;
5220         }
5221         calldata->timestamp = jiffies;
5222         if (nfs4_setup_sequence(calldata->server,
5223                                 &calldata->arg.seq_args,
5224                                 &calldata->res.seq_res,
5225                                 task) != 0)
5226                 nfs_release_seqid(calldata->arg.seqid);
5227         return;
5228 out_no_action:
5229         task->tk_action = NULL;
5230 out_wait:
5231         nfs4_sequence_done(task, &calldata->res.seq_res);
5232 }
5233
5234 static const struct rpc_call_ops nfs4_locku_ops = {
5235         .rpc_call_prepare = nfs4_locku_prepare,
5236         .rpc_call_done = nfs4_locku_done,
5237         .rpc_release = nfs4_locku_release_calldata,
5238 };
5239
5240 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5241                 struct nfs_open_context *ctx,
5242                 struct nfs4_lock_state *lsp,
5243                 struct nfs_seqid *seqid)
5244 {
5245         struct nfs4_unlockdata *data;
5246         struct rpc_message msg = {
5247                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5248                 .rpc_cred = ctx->cred,
5249         };
5250         struct rpc_task_setup task_setup_data = {
5251                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5252                 .rpc_message = &msg,
5253                 .callback_ops = &nfs4_locku_ops,
5254                 .workqueue = nfsiod_workqueue,
5255                 .flags = RPC_TASK_ASYNC,
5256         };
5257
5258         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5259                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5260
5261         /* Ensure this is an unlock - when canceling a lock, the
5262          * canceled lock is passed in, and it won't be an unlock.
5263          */
5264         fl->fl_type = F_UNLCK;
5265
5266         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5267         if (data == NULL) {
5268                 nfs_free_seqid(seqid);
5269                 return ERR_PTR(-ENOMEM);
5270         }
5271
5272         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5273         msg.rpc_argp = &data->arg;
5274         msg.rpc_resp = &data->res;
5275         task_setup_data.callback_data = data;
5276         return rpc_run_task(&task_setup_data);
5277 }
5278
5279 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5280 {
5281         struct inode *inode = state->inode;
5282         struct nfs4_state_owner *sp = state->owner;
5283         struct nfs_inode *nfsi = NFS_I(inode);
5284         struct nfs_seqid *seqid;
5285         struct nfs4_lock_state *lsp;
5286         struct rpc_task *task;
5287         int status = 0;
5288         unsigned char fl_flags = request->fl_flags;
5289
5290         status = nfs4_set_lock_state(state, request);
5291         /* Unlock _before_ we do the RPC call */
5292         request->fl_flags |= FL_EXISTS;
5293         /* Exclude nfs_delegation_claim_locks() */
5294         mutex_lock(&sp->so_delegreturn_mutex);
5295         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5296         down_read(&nfsi->rwsem);
5297         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5298                 up_read(&nfsi->rwsem);
5299                 mutex_unlock(&sp->so_delegreturn_mutex);
5300                 goto out;
5301         }
5302         up_read(&nfsi->rwsem);
5303         mutex_unlock(&sp->so_delegreturn_mutex);
5304         if (status != 0)
5305                 goto out;
5306         /* Is this a delegated lock? */
5307         lsp = request->fl_u.nfs4_fl.owner;
5308         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5309                 goto out;
5310         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5311         status = -ENOMEM;
5312         if (seqid == NULL)
5313                 goto out;
5314         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5315         status = PTR_ERR(task);
5316         if (IS_ERR(task))
5317                 goto out;
5318         status = nfs4_wait_for_completion_rpc_task(task);
5319         rpc_put_task(task);
5320 out:
5321         request->fl_flags = fl_flags;
5322         trace_nfs4_unlock(request, state, F_SETLK, status);
5323         return status;
5324 }
5325
5326 struct nfs4_lockdata {
5327         struct nfs_lock_args arg;
5328         struct nfs_lock_res res;
5329         struct nfs4_lock_state *lsp;
5330         struct nfs_open_context *ctx;
5331         struct file_lock fl;
5332         unsigned long timestamp;
5333         int rpc_status;
5334         int cancelled;
5335         struct nfs_server *server;
5336 };
5337
5338 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5339                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5340                 gfp_t gfp_mask)
5341 {
5342         struct nfs4_lockdata *p;
5343         struct inode *inode = lsp->ls_state->inode;
5344         struct nfs_server *server = NFS_SERVER(inode);
5345
5346         p = kzalloc(sizeof(*p), gfp_mask);
5347         if (p == NULL)
5348                 return NULL;
5349
5350         p->arg.fh = NFS_FH(inode);
5351         p->arg.fl = &p->fl;
5352         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5353         if (p->arg.open_seqid == NULL)
5354                 goto out_free;
5355         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
5356         if (p->arg.lock_seqid == NULL)
5357                 goto out_free_seqid;
5358         p->arg.lock_stateid = &lsp->ls_stateid;
5359         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5360         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5361         p->arg.lock_owner.s_dev = server->s_dev;
5362         p->res.lock_seqid = p->arg.lock_seqid;
5363         p->lsp = lsp;
5364         p->server = server;
5365         atomic_inc(&lsp->ls_count);
5366         p->ctx = get_nfs_open_context(ctx);
5367         memcpy(&p->fl, fl, sizeof(p->fl));
5368         return p;
5369 out_free_seqid:
5370         nfs_free_seqid(p->arg.open_seqid);
5371 out_free:
5372         kfree(p);
5373         return NULL;
5374 }
5375
5376 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5377 {
5378         struct nfs4_lockdata *data = calldata;
5379         struct nfs4_state *state = data->lsp->ls_state;
5380
5381         dprintk("%s: begin!\n", __func__);
5382         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5383                 goto out_wait;
5384         /* Do we need to do an open_to_lock_owner? */
5385         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
5386                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5387                         goto out_release_lock_seqid;
5388                 }
5389                 data->arg.open_stateid = &state->open_stateid;
5390                 data->arg.new_lock_owner = 1;
5391                 data->res.open_seqid = data->arg.open_seqid;
5392         } else
5393                 data->arg.new_lock_owner = 0;
5394         if (!nfs4_valid_open_stateid(state)) {
5395                 data->rpc_status = -EBADF;
5396                 task->tk_action = NULL;
5397                 goto out_release_open_seqid;
5398         }
5399         data->timestamp = jiffies;
5400         if (nfs4_setup_sequence(data->server,
5401                                 &data->arg.seq_args,
5402                                 &data->res.seq_res,
5403                                 task) == 0)
5404                 return;
5405 out_release_open_seqid:
5406         nfs_release_seqid(data->arg.open_seqid);
5407 out_release_lock_seqid:
5408         nfs_release_seqid(data->arg.lock_seqid);
5409 out_wait:
5410         nfs4_sequence_done(task, &data->res.seq_res);
5411         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5412 }
5413
5414 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5415 {
5416         struct nfs4_lockdata *data = calldata;
5417
5418         dprintk("%s: begin!\n", __func__);
5419
5420         if (!nfs4_sequence_done(task, &data->res.seq_res))
5421                 return;
5422
5423         data->rpc_status = task->tk_status;
5424         if (data->arg.new_lock_owner != 0) {
5425                 if (data->rpc_status == 0)
5426                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
5427                 else
5428                         goto out;
5429         }
5430         if (data->rpc_status == 0) {
5431                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
5432                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
5433                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
5434         }
5435 out:
5436         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5437 }
5438
5439 static void nfs4_lock_release(void *calldata)
5440 {
5441         struct nfs4_lockdata *data = calldata;
5442
5443         dprintk("%s: begin!\n", __func__);
5444         nfs_free_seqid(data->arg.open_seqid);
5445         if (data->cancelled != 0) {
5446                 struct rpc_task *task;
5447                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5448                                 data->arg.lock_seqid);
5449                 if (!IS_ERR(task))
5450                         rpc_put_task_async(task);
5451                 dprintk("%s: cancelling lock!\n", __func__);
5452         } else
5453                 nfs_free_seqid(data->arg.lock_seqid);
5454         nfs4_put_lock_state(data->lsp);
5455         put_nfs_open_context(data->ctx);
5456         kfree(data);
5457         dprintk("%s: done!\n", __func__);
5458 }
5459
5460 static const struct rpc_call_ops nfs4_lock_ops = {
5461         .rpc_call_prepare = nfs4_lock_prepare,
5462         .rpc_call_done = nfs4_lock_done,
5463         .rpc_release = nfs4_lock_release,
5464 };
5465
5466 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5467 {
5468         switch (error) {
5469         case -NFS4ERR_ADMIN_REVOKED:
5470         case -NFS4ERR_BAD_STATEID:
5471                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5472                 if (new_lock_owner != 0 ||
5473                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5474                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5475                 break;
5476         case -NFS4ERR_STALE_STATEID:
5477                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5478         case -NFS4ERR_EXPIRED:
5479                 nfs4_schedule_lease_recovery(server->nfs_client);
5480         };
5481 }
5482
5483 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5484 {
5485         struct nfs4_lockdata *data;
5486         struct rpc_task *task;
5487         struct rpc_message msg = {
5488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5489                 .rpc_cred = state->owner->so_cred,
5490         };
5491         struct rpc_task_setup task_setup_data = {
5492                 .rpc_client = NFS_CLIENT(state->inode),
5493                 .rpc_message = &msg,
5494                 .callback_ops = &nfs4_lock_ops,
5495                 .workqueue = nfsiod_workqueue,
5496                 .flags = RPC_TASK_ASYNC,
5497         };
5498         int ret;
5499
5500         dprintk("%s: begin!\n", __func__);
5501         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5502                         fl->fl_u.nfs4_fl.owner,
5503                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5504         if (data == NULL)
5505                 return -ENOMEM;
5506         if (IS_SETLKW(cmd))
5507                 data->arg.block = 1;
5508         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5509         msg.rpc_argp = &data->arg;
5510         msg.rpc_resp = &data->res;
5511         task_setup_data.callback_data = data;
5512         if (recovery_type > NFS_LOCK_NEW) {
5513                 if (recovery_type == NFS_LOCK_RECLAIM)
5514                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5515                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5516         }
5517         task = rpc_run_task(&task_setup_data);
5518         if (IS_ERR(task))
5519                 return PTR_ERR(task);
5520         ret = nfs4_wait_for_completion_rpc_task(task);
5521         if (ret == 0) {
5522                 ret = data->rpc_status;
5523                 if (ret)
5524                         nfs4_handle_setlk_error(data->server, data->lsp,
5525                                         data->arg.new_lock_owner, ret);
5526         } else
5527                 data->cancelled = 1;
5528         rpc_put_task(task);
5529         dprintk("%s: done, ret = %d!\n", __func__, ret);
5530         return ret;
5531 }
5532
5533 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5534 {
5535         struct nfs_server *server = NFS_SERVER(state->inode);
5536         struct nfs4_exception exception = {
5537                 .inode = state->inode,
5538         };
5539         int err;
5540
5541         do {
5542                 /* Cache the lock if possible... */
5543                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5544                         return 0;
5545                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5546                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5547                 if (err != -NFS4ERR_DELAY)
5548                         break;
5549                 nfs4_handle_exception(server, err, &exception);
5550         } while (exception.retry);
5551         return err;
5552 }
5553
5554 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5555 {
5556         struct nfs_server *server = NFS_SERVER(state->inode);
5557         struct nfs4_exception exception = {
5558                 .inode = state->inode,
5559         };
5560         int err;
5561
5562         err = nfs4_set_lock_state(state, request);
5563         if (err != 0)
5564                 return err;
5565         if (!recover_lost_locks) {
5566                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5567                 return 0;
5568         }
5569         do {
5570                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5571                         return 0;
5572                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5573                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5574                 switch (err) {
5575                 default:
5576                         goto out;
5577                 case -NFS4ERR_GRACE:
5578                 case -NFS4ERR_DELAY:
5579                         nfs4_handle_exception(server, err, &exception);
5580                         err = 0;
5581                 }
5582         } while (exception.retry);
5583 out:
5584         return err;
5585 }
5586
5587 #if defined(CONFIG_NFS_V4_1)
5588 /**
5589  * nfs41_check_expired_locks - possibly free a lock stateid
5590  *
5591  * @state: NFSv4 state for an inode
5592  *
5593  * Returns NFS_OK if recovery for this stateid is now finished.
5594  * Otherwise a negative NFS4ERR value is returned.
5595  */
5596 static int nfs41_check_expired_locks(struct nfs4_state *state)
5597 {
5598         int status, ret = -NFS4ERR_BAD_STATEID;
5599         struct nfs4_lock_state *lsp;
5600         struct nfs_server *server = NFS_SERVER(state->inode);
5601
5602         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5603                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5604                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5605
5606                         status = nfs41_test_stateid(server,
5607                                         &lsp->ls_stateid,
5608                                         cred);
5609                         trace_nfs4_test_lock_stateid(state, lsp, status);
5610                         if (status != NFS_OK) {
5611                                 /* Free the stateid unless the server
5612                                  * informs us the stateid is unrecognized. */
5613                                 if (status != -NFS4ERR_BAD_STATEID)
5614                                         nfs41_free_stateid(server,
5615                                                         &lsp->ls_stateid,
5616                                                         cred);
5617                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5618                                 ret = status;
5619                         }
5620                 }
5621         };
5622
5623         return ret;
5624 }
5625
5626 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5627 {
5628         int status = NFS_OK;
5629
5630         if (test_bit(LK_STATE_IN_USE, &state->flags))
5631                 status = nfs41_check_expired_locks(state);
5632         if (status != NFS_OK)
5633                 status = nfs4_lock_expired(state, request);
5634         return status;
5635 }
5636 #endif
5637
5638 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5639 {
5640         struct nfs4_state_owner *sp = state->owner;
5641         struct nfs_inode *nfsi = NFS_I(state->inode);
5642         unsigned char fl_flags = request->fl_flags;
5643         unsigned int seq;
5644         int status = -ENOLCK;
5645
5646         if ((fl_flags & FL_POSIX) &&
5647                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5648                 goto out;
5649         /* Is this a delegated open? */
5650         status = nfs4_set_lock_state(state, request);
5651         if (status != 0)
5652                 goto out;
5653         request->fl_flags |= FL_ACCESS;
5654         status = do_vfs_lock(request->fl_file, request);
5655         if (status < 0)
5656                 goto out;
5657         down_read(&nfsi->rwsem);
5658         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5659                 /* Yes: cache locks! */
5660                 /* ...but avoid races with delegation recall... */
5661                 request->fl_flags = fl_flags & ~FL_SLEEP;
5662                 status = do_vfs_lock(request->fl_file, request);
5663                 goto out_unlock;
5664         }
5665         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
5666         up_read(&nfsi->rwsem);
5667         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5668         if (status != 0)
5669                 goto out;
5670         down_read(&nfsi->rwsem);
5671         if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) {
5672                 status = -NFS4ERR_DELAY;
5673                 goto out_unlock;
5674         }
5675         /* Note: we always want to sleep here! */
5676         request->fl_flags = fl_flags | FL_SLEEP;
5677         if (do_vfs_lock(request->fl_file, request) < 0)
5678                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5679                         "manager!\n", __func__);
5680 out_unlock:
5681         up_read(&nfsi->rwsem);
5682 out:
5683         request->fl_flags = fl_flags;
5684         return status;
5685 }
5686
5687 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5688 {
5689         struct nfs4_exception exception = {
5690                 .state = state,
5691                 .inode = state->inode,
5692         };
5693         int err;
5694
5695         do {
5696                 err = _nfs4_proc_setlk(state, cmd, request);
5697                 trace_nfs4_set_lock(request, state, cmd, err);
5698                 if (err == -NFS4ERR_DENIED)
5699                         err = -EAGAIN;
5700                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5701                                 err, &exception);
5702         } while (exception.retry);
5703         return err;
5704 }
5705
5706 static int
5707 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5708 {
5709         struct nfs_open_context *ctx;
5710         struct nfs4_state *state;
5711         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5712         int status;
5713
5714         /* verify open state */
5715         ctx = nfs_file_open_context(filp);
5716         state = ctx->state;
5717
5718         if (request->fl_start < 0 || request->fl_end < 0)
5719                 return -EINVAL;
5720
5721         if (IS_GETLK(cmd)) {
5722                 if (state != NULL)
5723                         return nfs4_proc_getlk(state, F_GETLK, request);
5724                 return 0;
5725         }
5726
5727         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5728                 return -EINVAL;
5729
5730         if (request->fl_type == F_UNLCK) {
5731                 if (state != NULL)
5732                         return nfs4_proc_unlck(state, cmd, request);
5733                 return 0;
5734         }
5735
5736         if (state == NULL)
5737                 return -ENOLCK;
5738         /*
5739          * Don't rely on the VFS having checked the file open mode,
5740          * since it won't do this for flock() locks.
5741          */
5742         switch (request->fl_type) {
5743         case F_RDLCK:
5744                 if (!(filp->f_mode & FMODE_READ))
5745                         return -EBADF;
5746                 break;
5747         case F_WRLCK:
5748                 if (!(filp->f_mode & FMODE_WRITE))
5749                         return -EBADF;
5750         }
5751
5752         do {
5753                 status = nfs4_proc_setlk(state, cmd, request);
5754                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5755                         break;
5756                 timeout = nfs4_set_lock_task_retry(timeout);
5757                 status = -ERESTARTSYS;
5758                 if (signalled())
5759                         break;
5760         } while(status < 0);
5761         return status;
5762 }
5763
5764 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
5765 {
5766         struct nfs_server *server = NFS_SERVER(state->inode);
5767         int err;
5768
5769         err = nfs4_set_lock_state(state, fl);
5770         if (err != 0)
5771                 return err;
5772         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5773         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
5774 }
5775
5776 struct nfs_release_lockowner_data {
5777         struct nfs4_lock_state *lsp;
5778         struct nfs_server *server;
5779         struct nfs_release_lockowner_args args;
5780         struct nfs4_sequence_args seq_args;
5781         struct nfs4_sequence_res seq_res;
5782 };
5783
5784 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
5785 {
5786         struct nfs_release_lockowner_data *data = calldata;
5787         nfs40_setup_sequence(data->server,
5788                                 &data->seq_args, &data->seq_res, task);
5789 }
5790
5791 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
5792 {
5793         struct nfs_release_lockowner_data *data = calldata;
5794         nfs40_sequence_done(task, &data->seq_res);
5795 }
5796
5797 static void nfs4_release_lockowner_release(void *calldata)
5798 {
5799         struct nfs_release_lockowner_data *data = calldata;
5800         nfs4_free_lock_state(data->server, data->lsp);
5801         kfree(calldata);
5802 }
5803
5804 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5805         .rpc_call_prepare = nfs4_release_lockowner_prepare,
5806         .rpc_call_done = nfs4_release_lockowner_done,
5807         .rpc_release = nfs4_release_lockowner_release,
5808 };
5809
5810 static int nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
5811 {
5812         struct nfs_release_lockowner_data *data;
5813         struct rpc_message msg = {
5814                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5815         };
5816
5817         if (server->nfs_client->cl_mvops->minor_version != 0)
5818                 return -EINVAL;
5819
5820         data = kmalloc(sizeof(*data), GFP_NOFS);
5821         if (!data)
5822                 return -ENOMEM;
5823         nfs4_init_sequence(&data->seq_args, &data->seq_res, 0);
5824         data->lsp = lsp;
5825         data->server = server;
5826         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5827         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5828         data->args.lock_owner.s_dev = server->s_dev;
5829
5830         msg.rpc_argp = &data->args;
5831         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5832         return 0;
5833 }
5834
5835 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5836
5837 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5838                                    const void *buf, size_t buflen,
5839                                    int flags, int type)
5840 {
5841         if (strcmp(key, "") != 0)
5842                 return -EINVAL;
5843
5844         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5845 }
5846
5847 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5848                                    void *buf, size_t buflen, int type)
5849 {
5850         if (strcmp(key, "") != 0)
5851                 return -EINVAL;
5852
5853         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5854 }
5855
5856 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5857                                        size_t list_len, const char *name,
5858                                        size_t name_len, int type)
5859 {
5860         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5861
5862         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5863                 return 0;
5864
5865         if (list && len <= list_len)
5866                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5867         return len;
5868 }
5869
5870 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5871 static inline int nfs4_server_supports_labels(struct nfs_server *server)
5872 {
5873         return server->caps & NFS_CAP_SECURITY_LABEL;
5874 }
5875
5876 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
5877                                    const void *buf, size_t buflen,
5878                                    int flags, int type)
5879 {
5880         if (security_ismaclabel(key))
5881                 return nfs4_set_security_label(dentry, buf, buflen);
5882
5883         return -EOPNOTSUPP;
5884 }
5885
5886 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
5887                                    void *buf, size_t buflen, int type)
5888 {
5889         if (security_ismaclabel(key))
5890                 return nfs4_get_security_label(dentry->d_inode, buf, buflen);
5891         return -EOPNOTSUPP;
5892 }
5893
5894 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
5895                                        size_t list_len, const char *name,
5896                                        size_t name_len, int type)
5897 {
5898         size_t len = 0;
5899
5900         if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
5901                 len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
5902                 if (list && len <= list_len)
5903                         security_inode_listsecurity(dentry->d_inode, list, len);
5904         }
5905         return len;
5906 }
5907
5908 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
5909         .prefix = XATTR_SECURITY_PREFIX,
5910         .list   = nfs4_xattr_list_nfs4_label,
5911         .get    = nfs4_xattr_get_nfs4_label,
5912         .set    = nfs4_xattr_set_nfs4_label,
5913 };
5914 #endif
5915
5916
5917 /*
5918  * nfs_fhget will use either the mounted_on_fileid or the fileid
5919  */
5920 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5921 {
5922         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5923                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5924               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5925               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5926                 return;
5927
5928         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5929                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5930         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5931         fattr->nlink = 2;
5932 }
5933
5934 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5935                                    const struct qstr *name,
5936                                    struct nfs4_fs_locations *fs_locations,
5937                                    struct page *page)
5938 {
5939         struct nfs_server *server = NFS_SERVER(dir);
5940         u32 bitmask[3] = {
5941                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5942         };
5943         struct nfs4_fs_locations_arg args = {
5944                 .dir_fh = NFS_FH(dir),
5945                 .name = name,
5946                 .page = page,
5947                 .bitmask = bitmask,
5948         };
5949         struct nfs4_fs_locations_res res = {
5950                 .fs_locations = fs_locations,
5951         };
5952         struct rpc_message msg = {
5953                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5954                 .rpc_argp = &args,
5955                 .rpc_resp = &res,
5956         };
5957         int status;
5958
5959         dprintk("%s: start\n", __func__);
5960
5961         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5962          * is not supported */
5963         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5964                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5965         else
5966                 bitmask[0] |= FATTR4_WORD0_FILEID;
5967
5968         nfs_fattr_init(&fs_locations->fattr);
5969         fs_locations->server = server;
5970         fs_locations->nlocations = 0;
5971         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5972         dprintk("%s: returned status = %d\n", __func__, status);
5973         return status;
5974 }
5975
5976 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5977                            const struct qstr *name,
5978                            struct nfs4_fs_locations *fs_locations,
5979                            struct page *page)
5980 {
5981         struct nfs4_exception exception = { };
5982         int err;
5983         do {
5984                 err = _nfs4_proc_fs_locations(client, dir, name,
5985                                 fs_locations, page);
5986                 trace_nfs4_get_fs_locations(dir, name, err);
5987                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5988                                 &exception);
5989         } while (exception.retry);
5990         return err;
5991 }
5992
5993 /**
5994  * If 'use_integrity' is true and the state managment nfs_client
5995  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
5996  * and the machine credential as per RFC3530bis and RFC5661 Security
5997  * Considerations sections. Otherwise, just use the user cred with the
5998  * filesystem's rpc_client.
5999  */
6000 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6001 {
6002         int status;
6003         struct nfs4_secinfo_arg args = {
6004                 .dir_fh = NFS_FH(dir),
6005                 .name   = name,
6006         };
6007         struct nfs4_secinfo_res res = {
6008                 .flavors     = flavors,
6009         };
6010         struct rpc_message msg = {
6011                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6012                 .rpc_argp = &args,
6013                 .rpc_resp = &res,
6014         };
6015         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6016         struct rpc_cred *cred = NULL;
6017
6018         if (use_integrity) {
6019                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6020                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6021                 msg.rpc_cred = cred;
6022         }
6023
6024         dprintk("NFS call  secinfo %s\n", name->name);
6025
6026         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6027                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6028
6029         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6030                                 &res.seq_res, 0);
6031         dprintk("NFS reply  secinfo: %d\n", status);
6032
6033         if (cred)
6034                 put_rpccred(cred);
6035
6036         return status;
6037 }
6038
6039 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6040                       struct nfs4_secinfo_flavors *flavors)
6041 {
6042         struct nfs4_exception exception = { };
6043         int err;
6044         do {
6045                 err = -NFS4ERR_WRONGSEC;
6046
6047                 /* try to use integrity protection with machine cred */
6048                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6049                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6050
6051                 /*
6052                  * if unable to use integrity protection, or SECINFO with
6053                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6054                  * disallowed by spec, but exists in deployed servers) use
6055                  * the current filesystem's rpc_client and the user cred.
6056                  */
6057                 if (err == -NFS4ERR_WRONGSEC)
6058                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6059
6060                 trace_nfs4_secinfo(dir, name, err);
6061                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6062                                 &exception);
6063         } while (exception.retry);
6064         return err;
6065 }
6066
6067 #ifdef CONFIG_NFS_V4_1
6068 /*
6069  * Check the exchange flags returned by the server for invalid flags, having
6070  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6071  * DS flags set.
6072  */
6073 static int nfs4_check_cl_exchange_flags(u32 flags)
6074 {
6075         if (flags & ~EXCHGID4_FLAG_MASK_R)
6076                 goto out_inval;
6077         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6078             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6079                 goto out_inval;
6080         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6081                 goto out_inval;
6082         return NFS_OK;
6083 out_inval:
6084         return -NFS4ERR_INVAL;
6085 }
6086
6087 static bool
6088 nfs41_same_server_scope(struct nfs41_server_scope *a,
6089                         struct nfs41_server_scope *b)
6090 {
6091         if (a->server_scope_sz == b->server_scope_sz &&
6092             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6093                 return true;
6094
6095         return false;
6096 }
6097
6098 /*
6099  * nfs4_proc_bind_conn_to_session()
6100  *
6101  * The 4.1 client currently uses the same TCP connection for the
6102  * fore and backchannel.
6103  */
6104 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6105 {
6106         int status;
6107         struct nfs41_bind_conn_to_session_res res;
6108         struct rpc_message msg = {
6109                 .rpc_proc =
6110                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6111                 .rpc_argp = clp,
6112                 .rpc_resp = &res,
6113                 .rpc_cred = cred,
6114         };
6115
6116         dprintk("--> %s\n", __func__);
6117
6118         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
6119         if (unlikely(res.session == NULL)) {
6120                 status = -ENOMEM;
6121                 goto out;
6122         }
6123
6124         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6125         trace_nfs4_bind_conn_to_session(clp, status);
6126         if (status == 0) {
6127                 if (memcmp(res.session->sess_id.data,
6128                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6129                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6130                         status = -EIO;
6131                         goto out_session;
6132                 }
6133                 if (res.dir != NFS4_CDFS4_BOTH) {
6134                         dprintk("NFS: %s: Unexpected direction from server\n",
6135                                 __func__);
6136                         status = -EIO;
6137                         goto out_session;
6138                 }
6139                 if (res.use_conn_in_rdma_mode) {
6140                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6141                                 __func__);
6142                         status = -EIO;
6143                         goto out_session;
6144                 }
6145         }
6146 out_session:
6147         kfree(res.session);
6148 out:
6149         dprintk("<-- %s status= %d\n", __func__, status);
6150         return status;
6151 }
6152
6153 /*
6154  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6155  * and operations we'd like to see to enable certain features in the allow map
6156  */
6157 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6158         .how = SP4_MACH_CRED,
6159         .enforce.u.words = {
6160                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6161                       1 << (OP_EXCHANGE_ID - 32) |
6162                       1 << (OP_CREATE_SESSION - 32) |
6163                       1 << (OP_DESTROY_SESSION - 32) |
6164                       1 << (OP_DESTROY_CLIENTID - 32)
6165         },
6166         .allow.u.words = {
6167                 [0] = 1 << (OP_CLOSE) |
6168                       1 << (OP_LOCKU) |
6169                       1 << (OP_COMMIT),
6170                 [1] = 1 << (OP_SECINFO - 32) |
6171                       1 << (OP_SECINFO_NO_NAME - 32) |
6172                       1 << (OP_TEST_STATEID - 32) |
6173                       1 << (OP_FREE_STATEID - 32) |
6174                       1 << (OP_WRITE - 32)
6175         }
6176 };
6177
6178 /*
6179  * Select the state protection mode for client `clp' given the server results
6180  * from exchange_id in `sp'.
6181  *
6182  * Returns 0 on success, negative errno otherwise.
6183  */
6184 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6185                                  struct nfs41_state_protection *sp)
6186 {
6187         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6188                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6189                       1 << (OP_EXCHANGE_ID - 32) |
6190                       1 << (OP_CREATE_SESSION - 32) |
6191                       1 << (OP_DESTROY_SESSION - 32) |
6192                       1 << (OP_DESTROY_CLIENTID - 32)
6193         };
6194         unsigned int i;
6195
6196         if (sp->how == SP4_MACH_CRED) {
6197                 /* Print state protect result */
6198                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6199                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6200                         if (test_bit(i, sp->enforce.u.longs))
6201                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6202                         if (test_bit(i, sp->allow.u.longs))
6203                                 dfprintk(MOUNT, "  allow op %d\n", i);
6204                 }
6205
6206                 /* make sure nothing is on enforce list that isn't supported */
6207                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6208                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6209                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6210                                 return -EINVAL;
6211                         }
6212                 }
6213
6214                 /*
6215                  * Minimal mode - state operations are allowed to use machine
6216                  * credential.  Note this already happens by default, so the
6217                  * client doesn't have to do anything more than the negotiation.
6218                  *
6219                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6220                  *       we're already using the machine cred for exchange_id
6221                  *       and will never use a different cred.
6222                  */
6223                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6224                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6225                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6226                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6227                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6228                         dfprintk(MOUNT, "  minimal mode enabled\n");
6229                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6230                 } else {
6231                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6232                         return -EINVAL;
6233                 }
6234
6235                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6236                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6237                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6238                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6239                 }
6240
6241                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6242                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6243                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6244                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6245                 }
6246
6247                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6248                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6249                         dfprintk(MOUNT, "  stateid mode enabled\n");
6250                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6251                 }
6252
6253                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6254                         dfprintk(MOUNT, "  write mode enabled\n");
6255                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6256                 }
6257
6258                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6259                         dfprintk(MOUNT, "  commit mode enabled\n");
6260                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6261                 }
6262         }
6263
6264         return 0;
6265 }
6266
6267 /*
6268  * _nfs4_proc_exchange_id()
6269  *
6270  * Wrapper for EXCHANGE_ID operation.
6271  */
6272 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6273         u32 sp4_how)
6274 {
6275         nfs4_verifier verifier;
6276         struct nfs41_exchange_id_args args = {
6277                 .verifier = &verifier,
6278                 .client = clp,
6279                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6280                         EXCHGID4_FLAG_BIND_PRINC_STATEID,
6281         };
6282         struct nfs41_exchange_id_res res = {
6283                 0
6284         };
6285         int status;
6286         struct rpc_message msg = {
6287                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6288                 .rpc_argp = &args,
6289                 .rpc_resp = &res,
6290                 .rpc_cred = cred,
6291         };
6292
6293         nfs4_init_boot_verifier(clp, &verifier);
6294         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6295                                                         sizeof(args.id));
6296         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6297                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6298                 args.id_len, args.id);
6299
6300         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6301                                         GFP_NOFS);
6302         if (unlikely(res.server_owner == NULL)) {
6303                 status = -ENOMEM;
6304                 goto out;
6305         }
6306
6307         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6308                                         GFP_NOFS);
6309         if (unlikely(res.server_scope == NULL)) {
6310                 status = -ENOMEM;
6311                 goto out_server_owner;
6312         }
6313
6314         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6315         if (unlikely(res.impl_id == NULL)) {
6316                 status = -ENOMEM;
6317                 goto out_server_scope;
6318         }
6319
6320         switch (sp4_how) {
6321         case SP4_NONE:
6322                 args.state_protect.how = SP4_NONE;
6323                 break;
6324
6325         case SP4_MACH_CRED:
6326                 args.state_protect = nfs4_sp4_mach_cred_request;
6327                 break;
6328
6329         default:
6330                 /* unsupported! */
6331                 WARN_ON_ONCE(1);
6332                 status = -EINVAL;
6333                 goto out_server_scope;
6334         }
6335
6336         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6337         trace_nfs4_exchange_id(clp, status);
6338         if (status == 0)
6339                 status = nfs4_check_cl_exchange_flags(res.flags);
6340
6341         if (status == 0)
6342                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6343
6344         if (status == 0) {
6345                 clp->cl_clientid = res.clientid;
6346                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
6347                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
6348                         clp->cl_seqid = res.seqid;
6349
6350                 kfree(clp->cl_serverowner);
6351                 clp->cl_serverowner = res.server_owner;
6352                 res.server_owner = NULL;
6353
6354                 /* use the most recent implementation id */
6355                 kfree(clp->cl_implid);
6356                 clp->cl_implid = res.impl_id;
6357
6358                 if (clp->cl_serverscope != NULL &&
6359                     !nfs41_same_server_scope(clp->cl_serverscope,
6360                                              res.server_scope)) {
6361                         dprintk("%s: server_scope mismatch detected\n",
6362                                 __func__);
6363                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6364                         kfree(clp->cl_serverscope);
6365                         clp->cl_serverscope = NULL;
6366                 }
6367
6368                 if (clp->cl_serverscope == NULL) {
6369                         clp->cl_serverscope = res.server_scope;
6370                         goto out;
6371                 }
6372         } else
6373                 kfree(res.impl_id);
6374
6375 out_server_owner:
6376         kfree(res.server_owner);
6377 out_server_scope:
6378         kfree(res.server_scope);
6379 out:
6380         if (clp->cl_implid != NULL)
6381                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6382                         "domain: %s, name: %s, date: %llu,%u\n",
6383                         clp->cl_implid->domain, clp->cl_implid->name,
6384                         clp->cl_implid->date.seconds,
6385                         clp->cl_implid->date.nseconds);
6386         dprintk("NFS reply exchange_id: %d\n", status);
6387         return status;
6388 }
6389
6390 /*
6391  * nfs4_proc_exchange_id()
6392  *
6393  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6394  *
6395  * Since the clientid has expired, all compounds using sessions
6396  * associated with the stale clientid will be returning
6397  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6398  * be in some phase of session reset.
6399  *
6400  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6401  */
6402 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6403 {
6404         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6405         int status;
6406
6407         /* try SP4_MACH_CRED if krb5i/p */
6408         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6409             authflavor == RPC_AUTH_GSS_KRB5P) {
6410                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6411                 if (!status)
6412                         return 0;
6413         }
6414
6415         /* try SP4_NONE */
6416         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6417 }
6418
6419 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6420                 struct rpc_cred *cred)
6421 {
6422         struct rpc_message msg = {
6423                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6424                 .rpc_argp = clp,
6425                 .rpc_cred = cred,
6426         };
6427         int status;
6428
6429         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6430         trace_nfs4_destroy_clientid(clp, status);
6431         if (status)
6432                 dprintk("NFS: Got error %d from the server %s on "
6433                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6434         return status;
6435 }
6436
6437 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6438                 struct rpc_cred *cred)
6439 {
6440         unsigned int loop;
6441         int ret;
6442
6443         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
6444                 ret = _nfs4_proc_destroy_clientid(clp, cred);
6445                 switch (ret) {
6446                 case -NFS4ERR_DELAY:
6447                 case -NFS4ERR_CLIENTID_BUSY:
6448                         ssleep(1);
6449                         break;
6450                 default:
6451                         return ret;
6452                 }
6453         }
6454         return 0;
6455 }
6456
6457 int nfs4_destroy_clientid(struct nfs_client *clp)
6458 {
6459         struct rpc_cred *cred;
6460         int ret = 0;
6461
6462         if (clp->cl_mvops->minor_version < 1)
6463                 goto out;
6464         if (clp->cl_exchange_flags == 0)
6465                 goto out;
6466         if (clp->cl_preserve_clid)
6467                 goto out;
6468         cred = nfs4_get_clid_cred(clp);
6469         ret = nfs4_proc_destroy_clientid(clp, cred);
6470         if (cred)
6471                 put_rpccred(cred);
6472         switch (ret) {
6473         case 0:
6474         case -NFS4ERR_STALE_CLIENTID:
6475                 clp->cl_exchange_flags = 0;
6476         }
6477 out:
6478         return ret;
6479 }
6480
6481 struct nfs4_get_lease_time_data {
6482         struct nfs4_get_lease_time_args *args;
6483         struct nfs4_get_lease_time_res *res;
6484         struct nfs_client *clp;
6485 };
6486
6487 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
6488                                         void *calldata)
6489 {
6490         struct nfs4_get_lease_time_data *data =
6491                         (struct nfs4_get_lease_time_data *)calldata;
6492
6493         dprintk("--> %s\n", __func__);
6494         /* just setup sequence, do not trigger session recovery
6495            since we're invoked within one */
6496         nfs41_setup_sequence(data->clp->cl_session,
6497                         &data->args->la_seq_args,
6498                         &data->res->lr_seq_res,
6499                         task);
6500         dprintk("<-- %s\n", __func__);
6501 }
6502
6503 /*
6504  * Called from nfs4_state_manager thread for session setup, so don't recover
6505  * from sequence operation or clientid errors.
6506  */
6507 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
6508 {
6509         struct nfs4_get_lease_time_data *data =
6510                         (struct nfs4_get_lease_time_data *)calldata;
6511
6512         dprintk("--> %s\n", __func__);
6513         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
6514                 return;
6515         switch (task->tk_status) {
6516         case -NFS4ERR_DELAY:
6517         case -NFS4ERR_GRACE:
6518                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
6519                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
6520                 task->tk_status = 0;
6521                 /* fall through */
6522         case -NFS4ERR_RETRY_UNCACHED_REP:
6523                 rpc_restart_call_prepare(task);
6524                 return;
6525         }
6526         dprintk("<-- %s\n", __func__);
6527 }
6528
6529 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
6530         .rpc_call_prepare = nfs4_get_lease_time_prepare,
6531         .rpc_call_done = nfs4_get_lease_time_done,
6532 };
6533
6534 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
6535 {
6536         struct rpc_task *task;
6537         struct nfs4_get_lease_time_args args;
6538         struct nfs4_get_lease_time_res res = {
6539                 .lr_fsinfo = fsinfo,
6540         };
6541         struct nfs4_get_lease_time_data data = {
6542                 .args = &args,
6543                 .res = &res,
6544                 .clp = clp,
6545         };
6546         struct rpc_message msg = {
6547                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
6548                 .rpc_argp = &args,
6549                 .rpc_resp = &res,
6550         };
6551         struct rpc_task_setup task_setup = {
6552                 .rpc_client = clp->cl_rpcclient,
6553                 .rpc_message = &msg,
6554                 .callback_ops = &nfs4_get_lease_time_ops,
6555                 .callback_data = &data,
6556                 .flags = RPC_TASK_TIMEOUT,
6557         };
6558         int status;
6559
6560         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
6561         nfs4_set_sequence_privileged(&args.la_seq_args);
6562         dprintk("--> %s\n", __func__);
6563         task = rpc_run_task(&task_setup);
6564
6565         if (IS_ERR(task))
6566                 status = PTR_ERR(task);
6567         else {
6568                 status = task->tk_status;
6569                 rpc_put_task(task);
6570         }
6571         dprintk("<-- %s return %d\n", __func__, status);
6572
6573         return status;
6574 }
6575
6576 /*
6577  * Initialize the values to be used by the client in CREATE_SESSION
6578  * If nfs4_init_session set the fore channel request and response sizes,
6579  * use them.
6580  *
6581  * Set the back channel max_resp_sz_cached to zero to force the client to
6582  * always set csa_cachethis to FALSE because the current implementation
6583  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
6584  */
6585 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
6586 {
6587         unsigned int max_rqst_sz, max_resp_sz;
6588
6589         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
6590         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
6591
6592         /* Fore channel attributes */
6593         args->fc_attrs.max_rqst_sz = max_rqst_sz;
6594         args->fc_attrs.max_resp_sz = max_resp_sz;
6595         args->fc_attrs.max_ops = NFS4_MAX_OPS;
6596         args->fc_attrs.max_reqs = max_session_slots;
6597
6598         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
6599                 "max_ops=%u max_reqs=%u\n",
6600                 __func__,
6601                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
6602                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
6603
6604         /* Back channel attributes */
6605         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
6606         args->bc_attrs.max_resp_sz = PAGE_SIZE;
6607         args->bc_attrs.max_resp_sz_cached = 0;
6608         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
6609         args->bc_attrs.max_reqs = 1;
6610
6611         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
6612                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
6613                 __func__,
6614                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
6615                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
6616                 args->bc_attrs.max_reqs);
6617 }
6618
6619 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6620 {
6621         struct nfs4_channel_attrs *sent = &args->fc_attrs;
6622         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
6623
6624         if (rcvd->max_resp_sz > sent->max_resp_sz)
6625                 return -EINVAL;
6626         /*
6627          * Our requested max_ops is the minimum we need; we're not
6628          * prepared to break up compounds into smaller pieces than that.
6629          * So, no point even trying to continue if the server won't
6630          * cooperate:
6631          */
6632         if (rcvd->max_ops < sent->max_ops)
6633                 return -EINVAL;
6634         if (rcvd->max_reqs == 0)
6635                 return -EINVAL;
6636         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
6637                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
6638         return 0;
6639 }
6640
6641 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
6642 {
6643         struct nfs4_channel_attrs *sent = &args->bc_attrs;
6644         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
6645
6646         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
6647                 return -EINVAL;
6648         if (rcvd->max_resp_sz < sent->max_resp_sz)
6649                 return -EINVAL;
6650         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
6651                 return -EINVAL;
6652         /* These would render the backchannel useless: */
6653         if (rcvd->max_ops != sent->max_ops)
6654                 return -EINVAL;
6655         if (rcvd->max_reqs != sent->max_reqs)
6656                 return -EINVAL;
6657         return 0;
6658 }
6659
6660 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6661                                      struct nfs4_session *session)
6662 {
6663         int ret;
6664
6665         ret = nfs4_verify_fore_channel_attrs(args, session);
6666         if (ret)
6667                 return ret;
6668         return nfs4_verify_back_channel_attrs(args, session);
6669 }
6670
6671 static int _nfs4_proc_create_session(struct nfs_client *clp,
6672                 struct rpc_cred *cred)
6673 {
6674         struct nfs4_session *session = clp->cl_session;
6675         struct nfs41_create_session_args args = {
6676                 .client = clp,
6677                 .cb_program = NFS4_CALLBACK,
6678         };
6679         struct nfs41_create_session_res res = {
6680                 .client = clp,
6681         };
6682         struct rpc_message msg = {
6683                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6684                 .rpc_argp = &args,
6685                 .rpc_resp = &res,
6686                 .rpc_cred = cred,
6687         };
6688         int status;
6689
6690         nfs4_init_channel_attrs(&args);
6691         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6692
6693         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6694         trace_nfs4_create_session(clp, status);
6695
6696         if (!status) {
6697                 /* Verify the session's negotiated channel_attrs values */
6698                 status = nfs4_verify_channel_attrs(&args, session);
6699                 /* Increment the clientid slot sequence id */
6700                 clp->cl_seqid++;
6701         }
6702
6703         return status;
6704 }
6705
6706 /*
6707  * Issues a CREATE_SESSION operation to the server.
6708  * It is the responsibility of the caller to verify the session is
6709  * expired before calling this routine.
6710  */
6711 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6712 {
6713         int status;
6714         unsigned *ptr;
6715         struct nfs4_session *session = clp->cl_session;
6716
6717         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6718
6719         status = _nfs4_proc_create_session(clp, cred);
6720         if (status)
6721                 goto out;
6722
6723         /* Init or reset the session slot tables */
6724         status = nfs4_setup_session_slot_tables(session);
6725         dprintk("slot table setup returned %d\n", status);
6726         if (status)
6727                 goto out;
6728
6729         ptr = (unsigned *)&session->sess_id.data[0];
6730         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6731                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6732 out:
6733         dprintk("<-- %s\n", __func__);
6734         return status;
6735 }
6736
6737 /*
6738  * Issue the over-the-wire RPC DESTROY_SESSION.
6739  * The caller must serialize access to this routine.
6740  */
6741 int nfs4_proc_destroy_session(struct nfs4_session *session,
6742                 struct rpc_cred *cred)
6743 {
6744         struct rpc_message msg = {
6745                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6746                 .rpc_argp = session,
6747                 .rpc_cred = cred,
6748         };
6749         int status = 0;
6750
6751         dprintk("--> nfs4_proc_destroy_session\n");
6752
6753         /* session is still being setup */
6754         if (session->clp->cl_cons_state != NFS_CS_READY)
6755                 return status;
6756
6757         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6758         trace_nfs4_destroy_session(session->clp, status);
6759
6760         if (status)
6761                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6762                         "Session has been destroyed regardless...\n", status);
6763
6764         dprintk("<-- nfs4_proc_destroy_session\n");
6765         return status;
6766 }
6767
6768 /*
6769  * Renew the cl_session lease.
6770  */
6771 struct nfs4_sequence_data {
6772         struct nfs_client *clp;
6773         struct nfs4_sequence_args args;
6774         struct nfs4_sequence_res res;
6775 };
6776
6777 static void nfs41_sequence_release(void *data)
6778 {
6779         struct nfs4_sequence_data *calldata = data;
6780         struct nfs_client *clp = calldata->clp;
6781
6782         if (atomic_read(&clp->cl_count) > 1)
6783                 nfs4_schedule_state_renewal(clp);
6784         nfs_put_client(clp);
6785         kfree(calldata);
6786 }
6787
6788 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6789 {
6790         switch(task->tk_status) {
6791         case -NFS4ERR_DELAY:
6792                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6793                 return -EAGAIN;
6794         default:
6795                 nfs4_schedule_lease_recovery(clp);
6796         }
6797         return 0;
6798 }
6799
6800 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6801 {
6802         struct nfs4_sequence_data *calldata = data;
6803         struct nfs_client *clp = calldata->clp;
6804
6805         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6806                 return;
6807
6808         trace_nfs4_sequence(clp, task->tk_status);
6809         if (task->tk_status < 0) {
6810                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6811                 if (atomic_read(&clp->cl_count) == 1)
6812                         goto out;
6813
6814                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6815                         rpc_restart_call_prepare(task);
6816                         return;
6817                 }
6818         }
6819         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6820 out:
6821         dprintk("<-- %s\n", __func__);
6822 }
6823
6824 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6825 {
6826         struct nfs4_sequence_data *calldata = data;
6827         struct nfs_client *clp = calldata->clp;
6828         struct nfs4_sequence_args *args;
6829         struct nfs4_sequence_res *res;
6830
6831         args = task->tk_msg.rpc_argp;
6832         res = task->tk_msg.rpc_resp;
6833
6834         nfs41_setup_sequence(clp->cl_session, args, res, task);
6835 }
6836
6837 static const struct rpc_call_ops nfs41_sequence_ops = {
6838         .rpc_call_done = nfs41_sequence_call_done,
6839         .rpc_call_prepare = nfs41_sequence_prepare,
6840         .rpc_release = nfs41_sequence_release,
6841 };
6842
6843 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
6844                 struct rpc_cred *cred,
6845                 bool is_privileged)
6846 {
6847         struct nfs4_sequence_data *calldata;
6848         struct rpc_message msg = {
6849                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6850                 .rpc_cred = cred,
6851         };
6852         struct rpc_task_setup task_setup_data = {
6853                 .rpc_client = clp->cl_rpcclient,
6854                 .rpc_message = &msg,
6855                 .callback_ops = &nfs41_sequence_ops,
6856                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6857         };
6858
6859         if (!atomic_inc_not_zero(&clp->cl_count))
6860                 return ERR_PTR(-EIO);
6861         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6862         if (calldata == NULL) {
6863                 nfs_put_client(clp);
6864                 return ERR_PTR(-ENOMEM);
6865         }
6866         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
6867         if (is_privileged)
6868                 nfs4_set_sequence_privileged(&calldata->args);
6869         msg.rpc_argp = &calldata->args;
6870         msg.rpc_resp = &calldata->res;
6871         calldata->clp = clp;
6872         task_setup_data.callback_data = calldata;
6873
6874         return rpc_run_task(&task_setup_data);
6875 }
6876
6877 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6878 {
6879         struct rpc_task *task;
6880         int ret = 0;
6881
6882         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6883                 return 0;
6884         task = _nfs41_proc_sequence(clp, cred, false);
6885         if (IS_ERR(task))
6886                 ret = PTR_ERR(task);
6887         else
6888                 rpc_put_task_async(task);
6889         dprintk("<-- %s status=%d\n", __func__, ret);
6890         return ret;
6891 }
6892
6893 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6894 {
6895         struct rpc_task *task;
6896         int ret;
6897
6898         task = _nfs41_proc_sequence(clp, cred, true);
6899         if (IS_ERR(task)) {
6900                 ret = PTR_ERR(task);
6901                 goto out;
6902         }
6903         ret = rpc_wait_for_completion_task(task);
6904         if (!ret) {
6905                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6906
6907                 if (task->tk_status == 0)
6908                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6909                 ret = task->tk_status;
6910         }
6911         rpc_put_task(task);
6912 out:
6913         dprintk("<-- %s status=%d\n", __func__, ret);
6914         return ret;
6915 }
6916
6917 struct nfs4_reclaim_complete_data {
6918         struct nfs_client *clp;
6919         struct nfs41_reclaim_complete_args arg;
6920         struct nfs41_reclaim_complete_res res;
6921 };
6922
6923 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6924 {
6925         struct nfs4_reclaim_complete_data *calldata = data;
6926
6927         nfs41_setup_sequence(calldata->clp->cl_session,
6928                         &calldata->arg.seq_args,
6929                         &calldata->res.seq_res,
6930                         task);
6931 }
6932
6933 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6934 {
6935         switch(task->tk_status) {
6936         case 0:
6937         case -NFS4ERR_COMPLETE_ALREADY:
6938         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6939                 break;
6940         case -NFS4ERR_DELAY:
6941                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6942                 /* fall through */
6943         case -NFS4ERR_RETRY_UNCACHED_REP:
6944                 return -EAGAIN;
6945         default:
6946                 nfs4_schedule_lease_recovery(clp);
6947         }
6948         return 0;
6949 }
6950
6951 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6952 {
6953         struct nfs4_reclaim_complete_data *calldata = data;
6954         struct nfs_client *clp = calldata->clp;
6955         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6956
6957         dprintk("--> %s\n", __func__);
6958         if (!nfs41_sequence_done(task, res))
6959                 return;
6960
6961         trace_nfs4_reclaim_complete(clp, task->tk_status);
6962         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6963                 rpc_restart_call_prepare(task);
6964                 return;
6965         }
6966         dprintk("<-- %s\n", __func__);
6967 }
6968
6969 static void nfs4_free_reclaim_complete_data(void *data)
6970 {
6971         struct nfs4_reclaim_complete_data *calldata = data;
6972
6973         kfree(calldata);
6974 }
6975
6976 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6977         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6978         .rpc_call_done = nfs4_reclaim_complete_done,
6979         .rpc_release = nfs4_free_reclaim_complete_data,
6980 };
6981
6982 /*
6983  * Issue a global reclaim complete.
6984  */
6985 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
6986                 struct rpc_cred *cred)
6987 {
6988         struct nfs4_reclaim_complete_data *calldata;
6989         struct rpc_task *task;
6990         struct rpc_message msg = {
6991                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6992                 .rpc_cred = cred,
6993         };
6994         struct rpc_task_setup task_setup_data = {
6995                 .rpc_client = clp->cl_rpcclient,
6996                 .rpc_message = &msg,
6997                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6998                 .flags = RPC_TASK_ASYNC,
6999         };
7000         int status = -ENOMEM;
7001
7002         dprintk("--> %s\n", __func__);
7003         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7004         if (calldata == NULL)
7005                 goto out;
7006         calldata->clp = clp;
7007         calldata->arg.one_fs = 0;
7008
7009         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7010         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7011         msg.rpc_argp = &calldata->arg;
7012         msg.rpc_resp = &calldata->res;
7013         task_setup_data.callback_data = calldata;
7014         task = rpc_run_task(&task_setup_data);
7015         if (IS_ERR(task)) {
7016                 status = PTR_ERR(task);
7017                 goto out;
7018         }
7019         status = nfs4_wait_for_completion_rpc_task(task);
7020         if (status == 0)
7021                 status = task->tk_status;
7022         rpc_put_task(task);
7023         return 0;
7024 out:
7025         dprintk("<-- %s status=%d\n", __func__, status);
7026         return status;
7027 }
7028
7029 static void
7030 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7031 {
7032         struct nfs4_layoutget *lgp = calldata;
7033         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7034         struct nfs4_session *session = nfs4_get_session(server);
7035
7036         dprintk("--> %s\n", __func__);
7037         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7038          * right now covering the LAYOUTGET we are about to send.
7039          * However, that is not so catastrophic, and there seems
7040          * to be no way to prevent it completely.
7041          */
7042         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7043                                 &lgp->res.seq_res, task))
7044                 return;
7045         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7046                                           NFS_I(lgp->args.inode)->layout,
7047                                           lgp->args.ctx->state)) {
7048                 rpc_exit(task, NFS4_OK);
7049         }
7050 }
7051
7052 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7053 {
7054         struct nfs4_layoutget *lgp = calldata;
7055         struct inode *inode = lgp->args.inode;
7056         struct nfs_server *server = NFS_SERVER(inode);
7057         struct pnfs_layout_hdr *lo;
7058         struct nfs4_state *state = NULL;
7059         unsigned long timeo, giveup;
7060
7061         dprintk("--> %s\n", __func__);
7062
7063         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7064                 goto out;
7065
7066         switch (task->tk_status) {
7067         case 0:
7068                 goto out;
7069         case -NFS4ERR_LAYOUTTRYLATER:
7070         case -NFS4ERR_RECALLCONFLICT:
7071                 timeo = rpc_get_timeout(task->tk_client);
7072                 giveup = lgp->args.timestamp + timeo;
7073                 if (time_after(giveup, jiffies))
7074                         task->tk_status = -NFS4ERR_DELAY;
7075                 break;
7076         case -NFS4ERR_EXPIRED:
7077         case -NFS4ERR_BAD_STATEID:
7078                 spin_lock(&inode->i_lock);
7079                 lo = NFS_I(inode)->layout;
7080                 if (!lo || list_empty(&lo->plh_segs)) {
7081                         spin_unlock(&inode->i_lock);
7082                         /* If the open stateid was bad, then recover it. */
7083                         state = lgp->args.ctx->state;
7084                 } else {
7085                         LIST_HEAD(head);
7086
7087                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7088                         spin_unlock(&inode->i_lock);
7089                         /* Mark the bad layout state as invalid, then
7090                          * retry using the open stateid. */
7091                         pnfs_free_lseg_list(&head);
7092                 }
7093         }
7094         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
7095                 rpc_restart_call_prepare(task);
7096 out:
7097         dprintk("<-- %s\n", __func__);
7098 }
7099
7100 static size_t max_response_pages(struct nfs_server *server)
7101 {
7102         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7103         return nfs_page_array_len(0, max_resp_sz);
7104 }
7105
7106 static void nfs4_free_pages(struct page **pages, size_t size)
7107 {
7108         int i;
7109
7110         if (!pages)
7111                 return;
7112
7113         for (i = 0; i < size; i++) {
7114                 if (!pages[i])
7115                         break;
7116                 __free_page(pages[i]);
7117         }
7118         kfree(pages);
7119 }
7120
7121 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7122 {
7123         struct page **pages;
7124         int i;
7125
7126         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7127         if (!pages) {
7128                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7129                 return NULL;
7130         }
7131
7132         for (i = 0; i < size; i++) {
7133                 pages[i] = alloc_page(gfp_flags);
7134                 if (!pages[i]) {
7135                         dprintk("%s: failed to allocate page\n", __func__);
7136                         nfs4_free_pages(pages, size);
7137                         return NULL;
7138                 }
7139         }
7140
7141         return pages;
7142 }
7143
7144 static void nfs4_layoutget_release(void *calldata)
7145 {
7146         struct nfs4_layoutget *lgp = calldata;
7147         struct inode *inode = lgp->args.inode;
7148         struct nfs_server *server = NFS_SERVER(inode);
7149         size_t max_pages = max_response_pages(server);
7150
7151         dprintk("--> %s\n", __func__);
7152         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7153         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7154         put_nfs_open_context(lgp->args.ctx);
7155         kfree(calldata);
7156         dprintk("<-- %s\n", __func__);
7157 }
7158
7159 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7160         .rpc_call_prepare = nfs4_layoutget_prepare,
7161         .rpc_call_done = nfs4_layoutget_done,
7162         .rpc_release = nfs4_layoutget_release,
7163 };
7164
7165 struct pnfs_layout_segment *
7166 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7167 {
7168         struct inode *inode = lgp->args.inode;
7169         struct nfs_server *server = NFS_SERVER(inode);
7170         size_t max_pages = max_response_pages(server);
7171         struct rpc_task *task;
7172         struct rpc_message msg = {
7173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7174                 .rpc_argp = &lgp->args,
7175                 .rpc_resp = &lgp->res,
7176                 .rpc_cred = lgp->cred,
7177         };
7178         struct rpc_task_setup task_setup_data = {
7179                 .rpc_client = server->client,
7180                 .rpc_message = &msg,
7181                 .callback_ops = &nfs4_layoutget_call_ops,
7182                 .callback_data = lgp,
7183                 .flags = RPC_TASK_ASYNC,
7184         };
7185         struct pnfs_layout_segment *lseg = NULL;
7186         int status = 0;
7187
7188         dprintk("--> %s\n", __func__);
7189
7190         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7191         if (!lgp->args.layout.pages) {
7192                 nfs4_layoutget_release(lgp);
7193                 return ERR_PTR(-ENOMEM);
7194         }
7195         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7196         lgp->args.timestamp = jiffies;
7197
7198         lgp->res.layoutp = &lgp->args.layout;
7199         lgp->res.seq_res.sr_slot = NULL;
7200         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7201
7202         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7203         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7204
7205         task = rpc_run_task(&task_setup_data);
7206         if (IS_ERR(task))
7207                 return ERR_CAST(task);
7208         status = nfs4_wait_for_completion_rpc_task(task);
7209         if (status == 0)
7210                 status = task->tk_status;
7211         trace_nfs4_layoutget(lgp->args.ctx,
7212                         &lgp->args.range,
7213                         &lgp->res.range,
7214                         status);
7215         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7216         if (status == 0 && lgp->res.layoutp->len)
7217                 lseg = pnfs_layout_process(lgp);
7218         rpc_put_task(task);
7219         dprintk("<-- %s status=%d\n", __func__, status);
7220         if (status)
7221                 return ERR_PTR(status);
7222         return lseg;
7223 }
7224
7225 static void
7226 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7227 {
7228         struct nfs4_layoutreturn *lrp = calldata;
7229
7230         dprintk("--> %s\n", __func__);
7231         nfs41_setup_sequence(lrp->clp->cl_session,
7232                         &lrp->args.seq_args,
7233                         &lrp->res.seq_res,
7234                         task);
7235 }
7236
7237 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7238 {
7239         struct nfs4_layoutreturn *lrp = calldata;
7240         struct nfs_server *server;
7241
7242         dprintk("--> %s\n", __func__);
7243
7244         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7245                 return;
7246
7247         server = NFS_SERVER(lrp->args.inode);
7248         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7249                 rpc_restart_call_prepare(task);
7250                 return;
7251         }
7252         dprintk("<-- %s\n", __func__);
7253 }
7254
7255 static void nfs4_layoutreturn_release(void *calldata)
7256 {
7257         struct nfs4_layoutreturn *lrp = calldata;
7258         struct pnfs_layout_hdr *lo = lrp->args.layout;
7259
7260         dprintk("--> %s\n", __func__);
7261         spin_lock(&lo->plh_inode->i_lock);
7262         if (lrp->res.lrs_present)
7263                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7264         lo->plh_block_lgets--;
7265         spin_unlock(&lo->plh_inode->i_lock);
7266         pnfs_put_layout_hdr(lrp->args.layout);
7267         kfree(calldata);
7268         dprintk("<-- %s\n", __func__);
7269 }
7270
7271 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7272         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7273         .rpc_call_done = nfs4_layoutreturn_done,
7274         .rpc_release = nfs4_layoutreturn_release,
7275 };
7276
7277 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
7278 {
7279         struct rpc_task *task;
7280         struct rpc_message msg = {
7281                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7282                 .rpc_argp = &lrp->args,
7283                 .rpc_resp = &lrp->res,
7284                 .rpc_cred = lrp->cred,
7285         };
7286         struct rpc_task_setup task_setup_data = {
7287                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7288                 .rpc_message = &msg,
7289                 .callback_ops = &nfs4_layoutreturn_call_ops,
7290                 .callback_data = lrp,
7291         };
7292         int status;
7293
7294         dprintk("--> %s\n", __func__);
7295         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7296         task = rpc_run_task(&task_setup_data);
7297         if (IS_ERR(task))
7298                 return PTR_ERR(task);
7299         status = task->tk_status;
7300         trace_nfs4_layoutreturn(lrp->args.inode, status);
7301         dprintk("<-- %s status=%d\n", __func__, status);
7302         rpc_put_task(task);
7303         return status;
7304 }
7305
7306 /*
7307  * Retrieve the list of Data Server devices from the MDS.
7308  */
7309 static int _nfs4_getdevicelist(struct nfs_server *server,
7310                                     const struct nfs_fh *fh,
7311                                     struct pnfs_devicelist *devlist)
7312 {
7313         struct nfs4_getdevicelist_args args = {
7314                 .fh = fh,
7315                 .layoutclass = server->pnfs_curr_ld->id,
7316         };
7317         struct nfs4_getdevicelist_res res = {
7318                 .devlist = devlist,
7319         };
7320         struct rpc_message msg = {
7321                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
7322                 .rpc_argp = &args,
7323                 .rpc_resp = &res,
7324         };
7325         int status;
7326
7327         dprintk("--> %s\n", __func__);
7328         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
7329                                 &res.seq_res, 0);
7330         dprintk("<-- %s status=%d\n", __func__, status);
7331         return status;
7332 }
7333
7334 int nfs4_proc_getdevicelist(struct nfs_server *server,
7335                             const struct nfs_fh *fh,
7336                             struct pnfs_devicelist *devlist)
7337 {
7338         struct nfs4_exception exception = { };
7339         int err;
7340
7341         do {
7342                 err = nfs4_handle_exception(server,
7343                                 _nfs4_getdevicelist(server, fh, devlist),
7344                                 &exception);
7345         } while (exception.retry);
7346
7347         dprintk("%s: err=%d, num_devs=%u\n", __func__,
7348                 err, devlist->num_devs);
7349
7350         return err;
7351 }
7352 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
7353
7354 static int
7355 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7356                 struct pnfs_device *pdev,
7357                 struct rpc_cred *cred)
7358 {
7359         struct nfs4_getdeviceinfo_args args = {
7360                 .pdev = pdev,
7361         };
7362         struct nfs4_getdeviceinfo_res res = {
7363                 .pdev = pdev,
7364         };
7365         struct rpc_message msg = {
7366                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7367                 .rpc_argp = &args,
7368                 .rpc_resp = &res,
7369                 .rpc_cred = cred,
7370         };
7371         int status;
7372
7373         dprintk("--> %s\n", __func__);
7374         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7375         dprintk("<-- %s status=%d\n", __func__, status);
7376
7377         return status;
7378 }
7379
7380 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7381                 struct pnfs_device *pdev,
7382                 struct rpc_cred *cred)
7383 {
7384         struct nfs4_exception exception = { };
7385         int err;
7386
7387         do {
7388                 err = nfs4_handle_exception(server,
7389                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7390                                         &exception);
7391         } while (exception.retry);
7392         return err;
7393 }
7394 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7395
7396 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7397 {
7398         struct nfs4_layoutcommit_data *data = calldata;
7399         struct nfs_server *server = NFS_SERVER(data->args.inode);
7400         struct nfs4_session *session = nfs4_get_session(server);
7401
7402         nfs41_setup_sequence(session,
7403                         &data->args.seq_args,
7404                         &data->res.seq_res,
7405                         task);
7406 }
7407
7408 static void
7409 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
7410 {
7411         struct nfs4_layoutcommit_data *data = calldata;
7412         struct nfs_server *server = NFS_SERVER(data->args.inode);
7413
7414         if (!nfs41_sequence_done(task, &data->res.seq_res))
7415                 return;
7416
7417         switch (task->tk_status) { /* Just ignore these failures */
7418         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
7419         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
7420         case -NFS4ERR_BADLAYOUT:     /* no layout */
7421         case -NFS4ERR_GRACE:        /* loca_recalim always false */
7422                 task->tk_status = 0;
7423                 break;
7424         case 0:
7425                 nfs_post_op_update_inode_force_wcc(data->args.inode,
7426                                                    data->res.fattr);
7427                 break;
7428         default:
7429                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
7430                         rpc_restart_call_prepare(task);
7431                         return;
7432                 }
7433         }
7434 }
7435
7436 static void nfs4_layoutcommit_release(void *calldata)
7437 {
7438         struct nfs4_layoutcommit_data *data = calldata;
7439
7440         pnfs_cleanup_layoutcommit(data);
7441         put_rpccred(data->cred);
7442         kfree(data);
7443 }
7444
7445 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
7446         .rpc_call_prepare = nfs4_layoutcommit_prepare,
7447         .rpc_call_done = nfs4_layoutcommit_done,
7448         .rpc_release = nfs4_layoutcommit_release,
7449 };
7450
7451 int
7452 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
7453 {
7454         struct rpc_message msg = {
7455                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
7456                 .rpc_argp = &data->args,
7457                 .rpc_resp = &data->res,
7458                 .rpc_cred = data->cred,
7459         };
7460         struct rpc_task_setup task_setup_data = {
7461                 .task = &data->task,
7462                 .rpc_client = NFS_CLIENT(data->args.inode),
7463                 .rpc_message = &msg,
7464                 .callback_ops = &nfs4_layoutcommit_ops,
7465                 .callback_data = data,
7466                 .flags = RPC_TASK_ASYNC,
7467         };
7468         struct rpc_task *task;
7469         int status = 0;
7470
7471         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
7472                 "lbw: %llu inode %lu\n",
7473                 data->task.tk_pid, sync,
7474                 data->args.lastbytewritten,
7475                 data->args.inode->i_ino);
7476
7477         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
7478         task = rpc_run_task(&task_setup_data);
7479         if (IS_ERR(task))
7480                 return PTR_ERR(task);
7481         if (sync == false)
7482                 goto out;
7483         status = nfs4_wait_for_completion_rpc_task(task);
7484         if (status != 0)
7485                 goto out;
7486         status = task->tk_status;
7487         trace_nfs4_layoutcommit(data->args.inode, status);
7488 out:
7489         dprintk("%s: status %d\n", __func__, status);
7490         rpc_put_task(task);
7491         return status;
7492 }
7493
7494 /**
7495  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
7496  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
7497  */
7498 static int
7499 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7500                     struct nfs_fsinfo *info,
7501                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7502 {
7503         struct nfs41_secinfo_no_name_args args = {
7504                 .style = SECINFO_STYLE_CURRENT_FH,
7505         };
7506         struct nfs4_secinfo_res res = {
7507                 .flavors = flavors,
7508         };
7509         struct rpc_message msg = {
7510                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
7511                 .rpc_argp = &args,
7512                 .rpc_resp = &res,
7513         };
7514         struct rpc_clnt *clnt = server->client;
7515         struct rpc_cred *cred = NULL;
7516         int status;
7517
7518         if (use_integrity) {
7519                 clnt = server->nfs_client->cl_rpcclient;
7520                 cred = nfs4_get_clid_cred(server->nfs_client);
7521                 msg.rpc_cred = cred;
7522         }
7523
7524         dprintk("--> %s\n", __func__);
7525         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
7526                                 &res.seq_res, 0);
7527         dprintk("<-- %s status=%d\n", __func__, status);
7528
7529         if (cred)
7530                 put_rpccred(cred);
7531
7532         return status;
7533 }
7534
7535 static int
7536 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
7537                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
7538 {
7539         struct nfs4_exception exception = { };
7540         int err;
7541         do {
7542                 /* first try using integrity protection */
7543                 err = -NFS4ERR_WRONGSEC;
7544
7545                 /* try to use integrity protection with machine cred */
7546                 if (_nfs4_is_integrity_protected(server->nfs_client))
7547                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7548                                                           flavors, true);
7549
7550                 /*
7551                  * if unable to use integrity protection, or SECINFO with
7552                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7553                  * disallowed by spec, but exists in deployed servers) use
7554                  * the current filesystem's rpc_client and the user cred.
7555                  */
7556                 if (err == -NFS4ERR_WRONGSEC)
7557                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
7558                                                           flavors, false);
7559
7560                 switch (err) {
7561                 case 0:
7562                 case -NFS4ERR_WRONGSEC:
7563                 case -NFS4ERR_NOTSUPP:
7564                         goto out;
7565                 default:
7566                         err = nfs4_handle_exception(server, err, &exception);
7567                 }
7568         } while (exception.retry);
7569 out:
7570         return err;
7571 }
7572
7573 static int
7574 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
7575                     struct nfs_fsinfo *info)
7576 {
7577         int err;
7578         struct page *page;
7579         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
7580         struct nfs4_secinfo_flavors *flavors;
7581         struct nfs4_secinfo4 *secinfo;
7582         int i;
7583
7584         page = alloc_page(GFP_KERNEL);
7585         if (!page) {
7586                 err = -ENOMEM;
7587                 goto out;
7588         }
7589
7590         flavors = page_address(page);
7591         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
7592
7593         /*
7594          * Fall back on "guess and check" method if
7595          * the server doesn't support SECINFO_NO_NAME
7596          */
7597         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
7598                 err = nfs4_find_root_sec(server, fhandle, info);
7599                 goto out_freepage;
7600         }
7601         if (err)
7602                 goto out_freepage;
7603
7604         for (i = 0; i < flavors->num_flavors; i++) {
7605                 secinfo = &flavors->flavors[i];
7606
7607                 switch (secinfo->flavor) {
7608                 case RPC_AUTH_NULL:
7609                 case RPC_AUTH_UNIX:
7610                 case RPC_AUTH_GSS:
7611                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
7612                                         &secinfo->flavor_info);
7613                         break;
7614                 default:
7615                         flavor = RPC_AUTH_MAXFLAVOR;
7616                         break;
7617                 }
7618
7619                 if (flavor != RPC_AUTH_MAXFLAVOR) {
7620                         err = nfs4_lookup_root_sec(server, fhandle,
7621                                                    info, flavor);
7622                         if (!err)
7623                                 break;
7624                 }
7625         }
7626
7627         if (flavor == RPC_AUTH_MAXFLAVOR)
7628                 err = -EPERM;
7629
7630 out_freepage:
7631         put_page(page);
7632         if (err == -EACCES)
7633                 return -EPERM;
7634 out:
7635         return err;
7636 }
7637
7638 static int _nfs41_test_stateid(struct nfs_server *server,
7639                 nfs4_stateid *stateid,
7640                 struct rpc_cred *cred)
7641 {
7642         int status;
7643         struct nfs41_test_stateid_args args = {
7644                 .stateid = stateid,
7645         };
7646         struct nfs41_test_stateid_res res;
7647         struct rpc_message msg = {
7648                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7649                 .rpc_argp = &args,
7650                 .rpc_resp = &res,
7651                 .rpc_cred = cred,
7652         };
7653         struct rpc_clnt *rpc_client = server->client;
7654
7655         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
7656                 &rpc_client, &msg);
7657
7658         dprintk("NFS call  test_stateid %p\n", stateid);
7659         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
7660         nfs4_set_sequence_privileged(&args.seq_args);
7661         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
7662                         &args.seq_args, &res.seq_res);
7663         if (status != NFS_OK) {
7664                 dprintk("NFS reply test_stateid: failed, %d\n", status);
7665                 return status;
7666         }
7667         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7668         return -res.status;
7669 }
7670
7671 /**
7672  * nfs41_test_stateid - perform a TEST_STATEID operation
7673  *
7674  * @server: server / transport on which to perform the operation
7675  * @stateid: state ID to test
7676  * @cred: credential
7677  *
7678  * Returns NFS_OK if the server recognizes that "stateid" is valid.
7679  * Otherwise a negative NFS4ERR value is returned if the operation
7680  * failed or the state ID is not currently valid.
7681  */
7682 static int nfs41_test_stateid(struct nfs_server *server,
7683                 nfs4_stateid *stateid,
7684                 struct rpc_cred *cred)
7685 {
7686         struct nfs4_exception exception = { };
7687         int err;
7688         do {
7689                 err = _nfs41_test_stateid(server, stateid, cred);
7690                 if (err != -NFS4ERR_DELAY)
7691                         break;
7692                 nfs4_handle_exception(server, err, &exception);
7693         } while (exception.retry);
7694         return err;
7695 }
7696
7697 struct nfs_free_stateid_data {
7698         struct nfs_server *server;
7699         struct nfs41_free_stateid_args args;
7700         struct nfs41_free_stateid_res res;
7701 };
7702
7703 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
7704 {
7705         struct nfs_free_stateid_data *data = calldata;
7706         nfs41_setup_sequence(nfs4_get_session(data->server),
7707                         &data->args.seq_args,
7708                         &data->res.seq_res,
7709                         task);
7710 }
7711
7712 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
7713 {
7714         struct nfs_free_stateid_data *data = calldata;
7715
7716         nfs41_sequence_done(task, &data->res.seq_res);
7717
7718         switch (task->tk_status) {
7719         case -NFS4ERR_DELAY:
7720                 if (nfs4_async_handle_error(task, data->server, NULL) == -EAGAIN)
7721                         rpc_restart_call_prepare(task);
7722         }
7723 }
7724
7725 static void nfs41_free_stateid_release(void *calldata)
7726 {
7727         kfree(calldata);
7728 }
7729
7730 static const struct rpc_call_ops nfs41_free_stateid_ops = {
7731         .rpc_call_prepare = nfs41_free_stateid_prepare,
7732         .rpc_call_done = nfs41_free_stateid_done,
7733         .rpc_release = nfs41_free_stateid_release,
7734 };
7735
7736 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
7737                 nfs4_stateid *stateid,
7738                 struct rpc_cred *cred,
7739                 bool privileged)
7740 {
7741         struct rpc_message msg = {
7742                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7743                 .rpc_cred = cred,
7744         };
7745         struct rpc_task_setup task_setup = {
7746                 .rpc_client = server->client,
7747                 .rpc_message = &msg,
7748                 .callback_ops = &nfs41_free_stateid_ops,
7749                 .flags = RPC_TASK_ASYNC,
7750         };
7751         struct nfs_free_stateid_data *data;
7752
7753         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
7754                 &task_setup.rpc_client, &msg);
7755
7756         dprintk("NFS call  free_stateid %p\n", stateid);
7757         data = kmalloc(sizeof(*data), GFP_NOFS);
7758         if (!data)
7759                 return ERR_PTR(-ENOMEM);
7760         data->server = server;
7761         nfs4_stateid_copy(&data->args.stateid, stateid);
7762
7763         task_setup.callback_data = data;
7764
7765         msg.rpc_argp = &data->args;
7766         msg.rpc_resp = &data->res;
7767         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
7768         if (privileged)
7769                 nfs4_set_sequence_privileged(&data->args.seq_args);
7770
7771         return rpc_run_task(&task_setup);
7772 }
7773
7774 /**
7775  * nfs41_free_stateid - perform a FREE_STATEID operation
7776  *
7777  * @server: server / transport on which to perform the operation
7778  * @stateid: state ID to release
7779  * @cred: credential
7780  *
7781  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7782  * negative NFS4ERR value is returned.
7783  */
7784 static int nfs41_free_stateid(struct nfs_server *server,
7785                 nfs4_stateid *stateid,
7786                 struct rpc_cred *cred)
7787 {
7788         struct rpc_task *task;
7789         int ret;
7790
7791         task = _nfs41_free_stateid(server, stateid, cred, true);
7792         if (IS_ERR(task))
7793                 return PTR_ERR(task);
7794         ret = rpc_wait_for_completion_task(task);
7795         if (!ret)
7796                 ret = task->tk_status;
7797         rpc_put_task(task);
7798         return ret;
7799 }
7800
7801 static int nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
7802 {
7803         struct rpc_task *task;
7804         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
7805
7806         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
7807         nfs4_free_lock_state(server, lsp);
7808         if (IS_ERR(task))
7809                 return PTR_ERR(task);
7810         rpc_put_task(task);
7811         return 0;
7812 }
7813
7814 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7815                 const nfs4_stateid *s2)
7816 {
7817         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7818                 return false;
7819
7820         if (s1->seqid == s2->seqid)
7821                 return true;
7822         if (s1->seqid == 0 || s2->seqid == 0)
7823                 return true;
7824
7825         return false;
7826 }
7827
7828 #endif /* CONFIG_NFS_V4_1 */
7829
7830 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7831                 const nfs4_stateid *s2)
7832 {
7833         return nfs4_stateid_match(s1, s2);
7834 }
7835
7836
7837 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7838         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7839         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7840         .recover_open   = nfs4_open_reclaim,
7841         .recover_lock   = nfs4_lock_reclaim,
7842         .establish_clid = nfs4_init_clientid,
7843         .detect_trunking = nfs40_discover_server_trunking,
7844 };
7845
7846 #if defined(CONFIG_NFS_V4_1)
7847 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7848         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7849         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7850         .recover_open   = nfs4_open_reclaim,
7851         .recover_lock   = nfs4_lock_reclaim,
7852         .establish_clid = nfs41_init_clientid,
7853         .reclaim_complete = nfs41_proc_reclaim_complete,
7854         .detect_trunking = nfs41_discover_server_trunking,
7855 };
7856 #endif /* CONFIG_NFS_V4_1 */
7857
7858 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7859         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7860         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7861         .recover_open   = nfs4_open_expired,
7862         .recover_lock   = nfs4_lock_expired,
7863         .establish_clid = nfs4_init_clientid,
7864 };
7865
7866 #if defined(CONFIG_NFS_V4_1)
7867 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7868         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7869         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7870         .recover_open   = nfs41_open_expired,
7871         .recover_lock   = nfs41_lock_expired,
7872         .establish_clid = nfs41_init_clientid,
7873 };
7874 #endif /* CONFIG_NFS_V4_1 */
7875
7876 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7877         .sched_state_renewal = nfs4_proc_async_renew,
7878         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7879         .renew_lease = nfs4_proc_renew,
7880 };
7881
7882 #if defined(CONFIG_NFS_V4_1)
7883 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7884         .sched_state_renewal = nfs41_proc_async_sequence,
7885         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7886         .renew_lease = nfs4_proc_sequence,
7887 };
7888 #endif
7889
7890 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7891         .minor_version = 0,
7892         .init_caps = NFS_CAP_READDIRPLUS
7893                 | NFS_CAP_ATOMIC_OPEN
7894                 | NFS_CAP_CHANGE_ATTR
7895                 | NFS_CAP_POSIX_LOCK,
7896         .init_client = nfs40_init_client,
7897         .shutdown_client = nfs40_shutdown_client,
7898         .match_stateid = nfs4_match_stateid,
7899         .find_root_sec = nfs4_find_root_sec,
7900         .free_lock_state = nfs4_release_lockowner,
7901         .call_sync_ops = &nfs40_call_sync_ops,
7902         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7903         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7904         .state_renewal_ops = &nfs40_state_renewal_ops,
7905 };
7906
7907 #if defined(CONFIG_NFS_V4_1)
7908 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7909         .minor_version = 1,
7910         .init_caps = NFS_CAP_READDIRPLUS
7911                 | NFS_CAP_ATOMIC_OPEN
7912                 | NFS_CAP_CHANGE_ATTR
7913                 | NFS_CAP_POSIX_LOCK
7914                 | NFS_CAP_STATEID_NFSV41
7915                 | NFS_CAP_ATOMIC_OPEN_V1,
7916         .init_client = nfs41_init_client,
7917         .shutdown_client = nfs41_shutdown_client,
7918         .match_stateid = nfs41_match_stateid,
7919         .find_root_sec = nfs41_find_root_sec,
7920         .free_lock_state = nfs41_free_lock_state,
7921         .call_sync_ops = &nfs41_call_sync_ops,
7922         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7923         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7924         .state_renewal_ops = &nfs41_state_renewal_ops,
7925 };
7926 #endif
7927
7928 #if defined(CONFIG_NFS_V4_2)
7929 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
7930         .minor_version = 2,
7931         .init_caps = NFS_CAP_READDIRPLUS
7932                 | NFS_CAP_ATOMIC_OPEN
7933                 | NFS_CAP_CHANGE_ATTR
7934                 | NFS_CAP_POSIX_LOCK
7935                 | NFS_CAP_STATEID_NFSV41
7936                 | NFS_CAP_ATOMIC_OPEN_V1,
7937         .init_client = nfs41_init_client,
7938         .shutdown_client = nfs41_shutdown_client,
7939         .match_stateid = nfs41_match_stateid,
7940         .find_root_sec = nfs41_find_root_sec,
7941         .free_lock_state = nfs41_free_lock_state,
7942         .call_sync_ops = &nfs41_call_sync_ops,
7943         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7944         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7945         .state_renewal_ops = &nfs41_state_renewal_ops,
7946 };
7947 #endif
7948
7949 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7950         [0] = &nfs_v4_0_minor_ops,
7951 #if defined(CONFIG_NFS_V4_1)
7952         [1] = &nfs_v4_1_minor_ops,
7953 #endif
7954 #if defined(CONFIG_NFS_V4_2)
7955         [2] = &nfs_v4_2_minor_ops,
7956 #endif
7957 };
7958
7959 static const struct inode_operations nfs4_dir_inode_operations = {
7960         .create         = nfs_create,
7961         .lookup         = nfs_lookup,
7962         .atomic_open    = nfs_atomic_open,
7963         .link           = nfs_link,
7964         .unlink         = nfs_unlink,
7965         .symlink        = nfs_symlink,
7966         .mkdir          = nfs_mkdir,
7967         .rmdir          = nfs_rmdir,
7968         .mknod          = nfs_mknod,
7969         .rename         = nfs_rename,
7970         .permission     = nfs_permission,
7971         .getattr        = nfs_getattr,
7972         .setattr        = nfs_setattr,
7973         .getxattr       = generic_getxattr,
7974         .setxattr       = generic_setxattr,
7975         .listxattr      = generic_listxattr,
7976         .removexattr    = generic_removexattr,
7977 };
7978
7979 static const struct inode_operations nfs4_file_inode_operations = {
7980         .permission     = nfs_permission,
7981         .getattr        = nfs_getattr,
7982         .setattr        = nfs_setattr,
7983         .getxattr       = generic_getxattr,
7984         .setxattr       = generic_setxattr,
7985         .listxattr      = generic_listxattr,
7986         .removexattr    = generic_removexattr,
7987 };
7988
7989 const struct nfs_rpc_ops nfs_v4_clientops = {
7990         .version        = 4,                    /* protocol version */
7991         .dentry_ops     = &nfs4_dentry_operations,
7992         .dir_inode_ops  = &nfs4_dir_inode_operations,
7993         .file_inode_ops = &nfs4_file_inode_operations,
7994         .file_ops       = &nfs4_file_operations,
7995         .getroot        = nfs4_proc_get_root,
7996         .submount       = nfs4_submount,
7997         .try_mount      = nfs4_try_mount,
7998         .getattr        = nfs4_proc_getattr,
7999         .setattr        = nfs4_proc_setattr,
8000         .lookup         = nfs4_proc_lookup,
8001         .access         = nfs4_proc_access,
8002         .readlink       = nfs4_proc_readlink,
8003         .create         = nfs4_proc_create,
8004         .remove         = nfs4_proc_remove,
8005         .unlink_setup   = nfs4_proc_unlink_setup,
8006         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8007         .unlink_done    = nfs4_proc_unlink_done,
8008         .rename         = nfs4_proc_rename,
8009         .rename_setup   = nfs4_proc_rename_setup,
8010         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8011         .rename_done    = nfs4_proc_rename_done,
8012         .link           = nfs4_proc_link,
8013         .symlink        = nfs4_proc_symlink,
8014         .mkdir          = nfs4_proc_mkdir,
8015         .rmdir          = nfs4_proc_remove,
8016         .readdir        = nfs4_proc_readdir,
8017         .mknod          = nfs4_proc_mknod,
8018         .statfs         = nfs4_proc_statfs,
8019         .fsinfo         = nfs4_proc_fsinfo,
8020         .pathconf       = nfs4_proc_pathconf,
8021         .set_capabilities = nfs4_server_capabilities,
8022         .decode_dirent  = nfs4_decode_dirent,
8023         .read_setup     = nfs4_proc_read_setup,
8024         .read_pageio_init = pnfs_pageio_init_read,
8025         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
8026         .read_done      = nfs4_read_done,
8027         .write_setup    = nfs4_proc_write_setup,
8028         .write_pageio_init = pnfs_pageio_init_write,
8029         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
8030         .write_done     = nfs4_write_done,
8031         .commit_setup   = nfs4_proc_commit_setup,
8032         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8033         .commit_done    = nfs4_commit_done,
8034         .lock           = nfs4_proc_lock,
8035         .clear_acl_cache = nfs4_zap_acl_attr,
8036         .close_context  = nfs4_close_context,
8037         .open_context   = nfs4_atomic_open,
8038         .have_delegation = nfs4_have_delegation,
8039         .return_delegation = nfs4_inode_return_delegation,
8040         .alloc_client   = nfs4_alloc_client,
8041         .init_client    = nfs4_init_client,
8042         .free_client    = nfs4_free_client,
8043         .create_server  = nfs4_create_server,
8044         .clone_server   = nfs_clone_server,
8045 };
8046
8047 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8048         .prefix = XATTR_NAME_NFSV4_ACL,
8049         .list   = nfs4_xattr_list_nfs4_acl,
8050         .get    = nfs4_xattr_get_nfs4_acl,
8051         .set    = nfs4_xattr_set_nfs4_acl,
8052 };
8053
8054 const struct xattr_handler *nfs4_xattr_handlers[] = {
8055         &nfs4_xattr_nfs4_acl_handler,
8056 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8057         &nfs4_xattr_nfs4_label_handler,
8058 #endif
8059         NULL
8060 };
8061
8062 /*
8063  * Local variables:
8064  *  c-basic-offset: 8
8065  * End:
8066  */