git.oblomov.eu Git - linux-2.6/blob - 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/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "internal.h"
  55 #include "iostat.h"
  56
  57 #define NFSDBG_FACILITY         NFSDBG_PROC
  58
  59 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  60 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  61
  62 struct nfs4_opendata;
  63 static int _nfs4_proc_open(struct nfs4_opendata *data);
  64 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  65 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  66 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  67 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 static int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __func__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         __be32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 197 {
 198         int res;
 199
 200         might_sleep();
 201
 202         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 203                         nfs_wait_bit_killable, TASK_KILLABLE);
 204         return res;
 205 }
 206
 207 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 208 {
 209         int res = 0;
 210
 211         might_sleep();
 212
 213         if (*timeout <= 0)
 214                 *timeout = NFS4_POLL_RETRY_MIN;
 215         if (*timeout > NFS4_POLL_RETRY_MAX)
 216                 *timeout = NFS4_POLL_RETRY_MAX;
 217         schedule_timeout_killable(*timeout);
 218         if (fatal_signal_pending(current))
 219                 res = -ERESTARTSYS;
 220         *timeout <<= 1;
 221         return res;
 222 }
 223
 224 /* This is the error handling routine for processes that are allowed
 225  * to sleep.
 226  */
 227 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 228 {
 229         struct nfs_client *clp = server->nfs_client;
 230         struct nfs4_state *state = exception->state;
 231         int ret = errorcode;
 232
 233         exception->retry = 0;
 234         switch(errorcode) {
 235                 case 0:
 236                         return 0;
 237                 case -NFS4ERR_ADMIN_REVOKED:
 238                 case -NFS4ERR_BAD_STATEID:
 239                 case -NFS4ERR_OPENMODE:
 240                         if (state == NULL)
 241                                 break;
 242                         nfs4_state_mark_reclaim_nograce(clp, state);
 243                 case -NFS4ERR_STALE_CLIENTID:
 244                 case -NFS4ERR_STALE_STATEID:
 245                 case -NFS4ERR_EXPIRED:
 246                         nfs4_schedule_state_recovery(clp);
 247                         ret = nfs4_wait_clnt_recover(clp);
 248                         if (ret == 0)
 249                                 exception->retry = 1;
 250                         break;
 251                 case -NFS4ERR_FILE_OPEN:
 252                 case -NFS4ERR_GRACE:
 253                 case -NFS4ERR_DELAY:
 254                         ret = nfs4_delay(server->client, &exception->timeout);
 255                         if (ret != 0)
 256                                 break;
 257                 case -NFS4ERR_OLD_STATEID:
 258                         exception->retry = 1;
 259         }
 260         /* We failed to handle the error */
 261         return nfs4_map_errors(ret);
 262 }
 263
 264
 265 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 266 {
 267         struct nfs_client *clp = server->nfs_client;
 268         spin_lock(&clp->cl_lock);
 269         if (time_before(clp->cl_last_renewal,timestamp))
 270                 clp->cl_last_renewal = timestamp;
 271         spin_unlock(&clp->cl_lock);
 272 }
 273
 274 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 275 {
 276         struct nfs_inode *nfsi = NFS_I(dir);
 277
 278         spin_lock(&dir->i_lock);
 279         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 280         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 281                 nfs_force_lookup_revalidate(dir);
 282         nfsi->change_attr = cinfo->after;
 283         spin_unlock(&dir->i_lock);
 284 }
 285
 286 struct nfs4_opendata {
 287         struct kref kref;
 288         struct nfs_openargs o_arg;
 289         struct nfs_openres o_res;
 290         struct nfs_open_confirmargs c_arg;
 291         struct nfs_open_confirmres c_res;
 292         struct nfs_fattr f_attr;
 293         struct nfs_fattr dir_attr;
 294         struct path path;
 295         struct dentry *dir;
 296         struct nfs4_state_owner *owner;
 297         struct nfs4_state *state;
 298         struct iattr attrs;
 299         unsigned long timestamp;
 300         unsigned int rpc_done : 1;
 301         int rpc_status;
 302         int cancelled;
 303 };
 304
 305
 306 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 307 {
 308         p->o_res.f_attr = &p->f_attr;
 309         p->o_res.dir_attr = &p->dir_attr;
 310         p->o_res.seqid = p->o_arg.seqid;
 311         p->c_res.seqid = p->c_arg.seqid;
 312         p->o_res.server = p->o_arg.server;
 313         nfs_fattr_init(&p->f_attr);
 314         nfs_fattr_init(&p->dir_attr);
 315 }
 316
 317 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 318                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 319                 const struct iattr *attrs)
 320 {
 321         struct dentry *parent = dget_parent(path->dentry);
 322         struct inode *dir = parent->d_inode;
 323         struct nfs_server *server = NFS_SERVER(dir);
 324         struct nfs4_opendata *p;
 325
 326         p = kzalloc(sizeof(*p), GFP_KERNEL);
 327         if (p == NULL)
 328                 goto err;
 329         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 330         if (p->o_arg.seqid == NULL)
 331                 goto err_free;
 332         p->path.mnt = mntget(path->mnt);
 333         p->path.dentry = dget(path->dentry);
 334         p->dir = parent;
 335         p->owner = sp;
 336         atomic_inc(&sp->so_count);
 337         p->o_arg.fh = NFS_FH(dir);
 338         p->o_arg.open_flags = flags;
 339         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 340         p->o_arg.clientid = server->nfs_client->cl_clientid;
 341         p->o_arg.id = sp->so_owner_id.id;
 342         p->o_arg.name = &p->path.dentry->d_name;
 343         p->o_arg.server = server;
 344         p->o_arg.bitmask = server->attr_bitmask;
 345         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 346         if (flags & O_EXCL) {
 347                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 348                 s[0] = jiffies;
 349                 s[1] = current->pid;
 350         } else if (flags & O_CREAT) {
 351                 p->o_arg.u.attrs = &p->attrs;
 352                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 353         }
 354         p->c_arg.fh = &p->o_res.fh;
 355         p->c_arg.stateid = &p->o_res.stateid;
 356         p->c_arg.seqid = p->o_arg.seqid;
 357         nfs4_init_opendata_res(p);
 358         kref_init(&p->kref);
 359         return p;
 360 err_free:
 361         kfree(p);
 362 err:
 363         dput(parent);
 364         return NULL;
 365 }
 366
 367 static void nfs4_opendata_free(struct kref *kref)
 368 {
 369         struct nfs4_opendata *p = container_of(kref,
 370                         struct nfs4_opendata, kref);
 371
 372         nfs_free_seqid(p->o_arg.seqid);
 373         if (p->state != NULL)
 374                 nfs4_put_open_state(p->state);
 375         nfs4_put_state_owner(p->owner);
 376         dput(p->dir);
 377         path_put(&p->path);
 378         kfree(p);
 379 }
 380
 381 static void nfs4_opendata_put(struct nfs4_opendata *p)
 382 {
 383         if (p != NULL)
 384                 kref_put(&p->kref, nfs4_opendata_free);
 385 }
 386
 387 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 388 {
 389         int ret;
 390
 391         ret = rpc_wait_for_completion_task(task);
 392         return ret;
 393 }
 394
 395 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 396 {
 397         int ret = 0;
 398
 399         if (open_mode & O_EXCL)
 400                 goto out;
 401         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 402                 case FMODE_READ:
 403                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 404                         break;
 405                 case FMODE_WRITE:
 406                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 407                         break;
 408                 case FMODE_READ|FMODE_WRITE:
 409                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 410         }
 411 out:
 412         return ret;
 413 }
 414
 415 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 416 {
 417         if ((delegation->type & fmode) != fmode)
 418                 return 0;
 419         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 420                 return 0;
 421         nfs_mark_delegation_referenced(delegation);
 422         return 1;
 423 }
 424
 425 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 426 {
 427         switch (fmode) {
 428                 case FMODE_WRITE:
 429                         state->n_wronly++;
 430                         break;
 431                 case FMODE_READ:
 432                         state->n_rdonly++;
 433                         break;
 434                 case FMODE_READ|FMODE_WRITE:
 435                         state->n_rdwr++;
 436         }
 437         nfs4_state_set_mode_locked(state, state->state | fmode);
 438 }
 439
 440 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 441 {
 442         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 443                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 444         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 445         switch (fmode) {
 446                 case FMODE_READ:
 447                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 448                         break;
 449                 case FMODE_WRITE:
 450                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 451                         break;
 452                 case FMODE_READ|FMODE_WRITE:
 453                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 454         }
 455 }
 456
 457 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 458 {
 459         write_seqlock(&state->seqlock);
 460         nfs_set_open_stateid_locked(state, stateid, fmode);
 461         write_sequnlock(&state->seqlock);
 462 }
 463
 464 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 465 {
 466         /*
 467          * Protect the call to nfs4_state_set_mode_locked and
 468          * serialise the stateid update
 469          */
 470         write_seqlock(&state->seqlock);
 471         if (deleg_stateid != NULL) {
 472                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 473                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 474         }
 475         if (open_stateid != NULL)
 476                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 477         write_sequnlock(&state->seqlock);
 478         spin_lock(&state->owner->so_lock);
 479         update_open_stateflags(state, fmode);
 480         spin_unlock(&state->owner->so_lock);
 481 }
 482
 483 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 484 {
 485         struct nfs_inode *nfsi = NFS_I(state->inode);
 486         struct nfs_delegation *deleg_cur;
 487         int ret = 0;
 488
 489         fmode &= (FMODE_READ|FMODE_WRITE);
 490
 491         rcu_read_lock();
 492         deleg_cur = rcu_dereference(nfsi->delegation);
 493         if (deleg_cur == NULL)
 494                 goto no_delegation;
 495
 496         spin_lock(&deleg_cur->lock);
 497         if (nfsi->delegation != deleg_cur ||
 498             (deleg_cur->type & fmode) != fmode)
 499                 goto no_delegation_unlock;
 500
 501         if (delegation == NULL)
 502                 delegation = &deleg_cur->stateid;
 503         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 504                 goto no_delegation_unlock;
 505
 506         nfs_mark_delegation_referenced(deleg_cur);
 507         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 508         ret = 1;
 509 no_delegation_unlock:
 510         spin_unlock(&deleg_cur->lock);
 511 no_delegation:
 512         rcu_read_unlock();
 513
 514         if (!ret && open_stateid != NULL) {
 515                 __update_open_stateid(state, open_stateid, NULL, fmode);
 516                 ret = 1;
 517         }
 518
 519         return ret;
 520 }
 521
 522
 523 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 524 {
 525         struct nfs_delegation *delegation;
 526
 527         rcu_read_lock();
 528         delegation = rcu_dereference(NFS_I(inode)->delegation);
 529         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 530                 rcu_read_unlock();
 531                 return;
 532         }
 533         rcu_read_unlock();
 534         nfs_inode_return_delegation(inode);
 535 }
 536
 537 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 538 {
 539         struct nfs4_state *state = opendata->state;
 540         struct nfs_inode *nfsi = NFS_I(state->inode);
 541         struct nfs_delegation *delegation;
 542         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 543         fmode_t fmode = opendata->o_arg.fmode;
 544         nfs4_stateid stateid;
 545         int ret = -EAGAIN;
 546
 547         for (;;) {
 548                 if (can_open_cached(state, fmode, open_mode)) {
 549                         spin_lock(&state->owner->so_lock);
 550                         if (can_open_cached(state, fmode, open_mode)) {
 551                                 update_open_stateflags(state, fmode);
 552                                 spin_unlock(&state->owner->so_lock);
 553                                 goto out_return_state;
 554                         }
 555                         spin_unlock(&state->owner->so_lock);
 556                 }
 557                 rcu_read_lock();
 558                 delegation = rcu_dereference(nfsi->delegation);
 559                 if (delegation == NULL ||
 560                     !can_open_delegated(delegation, fmode)) {
 561                         rcu_read_unlock();
 562                         break;
 563                 }
 564                 /* Save the delegation */
 565                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 566                 rcu_read_unlock();
 567                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 568                 if (ret != 0)
 569                         goto out;
 570                 ret = -EAGAIN;
 571
 572                 /* Try to update the stateid using the delegation */
 573                 if (update_open_stateid(state, NULL, &stateid, fmode))
 574                         goto out_return_state;
 575         }
 576 out:
 577         return ERR_PTR(ret);
 578 out_return_state:
 579         atomic_inc(&state->count);
 580         return state;
 581 }
 582
 583 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 584 {
 585         struct inode *inode;
 586         struct nfs4_state *state = NULL;
 587         struct nfs_delegation *delegation;
 588         int ret;
 589
 590         if (!data->rpc_done) {
 591                 state = nfs4_try_open_cached(data);
 592                 goto out;
 593         }
 594
 595         ret = -EAGAIN;
 596         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 597                 goto err;
 598         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 599         ret = PTR_ERR(inode);
 600         if (IS_ERR(inode))
 601                 goto err;
 602         ret = -ENOMEM;
 603         state = nfs4_get_open_state(inode, data->owner);
 604         if (state == NULL)
 605                 goto err_put_inode;
 606         if (data->o_res.delegation_type != 0) {
 607                 int delegation_flags = 0;
 608
 609                 rcu_read_lock();
 610                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 611                 if (delegation)
 612                         delegation_flags = delegation->flags;
 613                 rcu_read_unlock();
 614                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 615                         nfs_inode_set_delegation(state->inode,
 616                                         data->owner->so_cred,
 617                                         &data->o_res);
 618                 else
 619                         nfs_inode_reclaim_delegation(state->inode,
 620                                         data->owner->so_cred,
 621                                         &data->o_res);
 622         }
 623
 624         update_open_stateid(state, &data->o_res.stateid, NULL,
 625                         data->o_arg.fmode);
 626         iput(inode);
 627 out:
 628         return state;
 629 err_put_inode:
 630         iput(inode);
 631 err:
 632         return ERR_PTR(ret);
 633 }
 634
 635 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 636 {
 637         struct nfs_inode *nfsi = NFS_I(state->inode);
 638         struct nfs_open_context *ctx;
 639
 640         spin_lock(&state->inode->i_lock);
 641         list_for_each_entry(ctx, &nfsi->open_files, list) {
 642                 if (ctx->state != state)
 643                         continue;
 644                 get_nfs_open_context(ctx);
 645                 spin_unlock(&state->inode->i_lock);
 646                 return ctx;
 647         }
 648         spin_unlock(&state->inode->i_lock);
 649         return ERR_PTR(-ENOENT);
 650 }
 651
 652 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 653 {
 654         struct nfs4_opendata *opendata;
 655
 656         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
 657         if (opendata == NULL)
 658                 return ERR_PTR(-ENOMEM);
 659         opendata->state = state;
 660         atomic_inc(&state->count);
 661         return opendata;
 662 }
 663
 664 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
 665 {
 666         struct nfs4_state *newstate;
 667         int ret;
 668
 669         opendata->o_arg.open_flags = 0;
 670         opendata->o_arg.fmode = fmode;
 671         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 672         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 673         nfs4_init_opendata_res(opendata);
 674         ret = _nfs4_proc_open(opendata);
 675         if (ret != 0)
 676                 return ret;
 677         newstate = nfs4_opendata_to_nfs4_state(opendata);
 678         if (IS_ERR(newstate))
 679                 return PTR_ERR(newstate);
 680         nfs4_close_state(&opendata->path, newstate, fmode);
 681         *res = newstate;
 682         return 0;
 683 }
 684
 685 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 686 {
 687         struct nfs4_state *newstate;
 688         int ret;
 689
 690         /* memory barrier prior to reading state->n_* */
 691         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 692         smp_rmb();
 693         if (state->n_rdwr != 0) {
 694                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 695                 if (ret != 0)
 696                         return ret;
 697                 if (newstate != state)
 698                         return -ESTALE;
 699         }
 700         if (state->n_wronly != 0) {
 701                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 702                 if (ret != 0)
 703                         return ret;
 704                 if (newstate != state)
 705                         return -ESTALE;
 706         }
 707         if (state->n_rdonly != 0) {
 708                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 709                 if (ret != 0)
 710                         return ret;
 711                 if (newstate != state)
 712                         return -ESTALE;
 713         }
 714         /*
 715          * We may have performed cached opens for all three recoveries.
 716          * Check if we need to update the current stateid.
 717          */
 718         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 719             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 720                 write_seqlock(&state->seqlock);
 721                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 722                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 723                 write_sequnlock(&state->seqlock);
 724         }
 725         return 0;
 726 }
 727
 728 /*
 729  * OPEN_RECLAIM:
 730  *      reclaim state on the server after a reboot.
 731  */
 732 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 733 {
 734         struct nfs_delegation *delegation;
 735         struct nfs4_opendata *opendata;
 736         fmode_t delegation_type = 0;
 737         int status;
 738
 739         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 740         if (IS_ERR(opendata))
 741                 return PTR_ERR(opendata);
 742         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 743         opendata->o_arg.fh = NFS_FH(state->inode);
 744         rcu_read_lock();
 745         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 746         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
 747                 delegation_type = delegation->type;
 748         rcu_read_unlock();
 749         opendata->o_arg.u.delegation_type = delegation_type;
 750         status = nfs4_open_recover(opendata, state);
 751         nfs4_opendata_put(opendata);
 752         return status;
 753 }
 754
 755 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 756 {
 757         struct nfs_server *server = NFS_SERVER(state->inode);
 758         struct nfs4_exception exception = { };
 759         int err;
 760         do {
 761                 err = _nfs4_do_open_reclaim(ctx, state);
 762                 if (err != -NFS4ERR_DELAY)
 763                         break;
 764                 nfs4_handle_exception(server, err, &exception);
 765         } while (exception.retry);
 766         return err;
 767 }
 768
 769 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 770 {
 771         struct nfs_open_context *ctx;
 772         int ret;
 773
 774         ctx = nfs4_state_find_open_context(state);
 775         if (IS_ERR(ctx))
 776                 return PTR_ERR(ctx);
 777         ret = nfs4_do_open_reclaim(ctx, state);
 778         put_nfs_open_context(ctx);
 779         return ret;
 780 }
 781
 782 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 783 {
 784         struct nfs4_opendata *opendata;
 785         int ret;
 786
 787         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 788         if (IS_ERR(opendata))
 789                 return PTR_ERR(opendata);
 790         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 791         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 792                         sizeof(opendata->o_arg.u.delegation.data));
 793         ret = nfs4_open_recover(opendata, state);
 794         nfs4_opendata_put(opendata);
 795         return ret;
 796 }
 797
 798 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 799 {
 800         struct nfs4_exception exception = { };
 801         struct nfs_server *server = NFS_SERVER(state->inode);
 802         int err;
 803         do {
 804                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 805                 switch (err) {
 806                         case 0:
 807                                 return err;
 808                         case -NFS4ERR_STALE_CLIENTID:
 809                         case -NFS4ERR_STALE_STATEID:
 810                         case -NFS4ERR_EXPIRED:
 811                                 /* Don't recall a delegation if it was lost */
 812                                 nfs4_schedule_state_recovery(server->nfs_client);
 813                                 return err;
 814                 }
 815                 err = nfs4_handle_exception(server, err, &exception);
 816         } while (exception.retry);
 817         return err;
 818 }
 819
 820 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 821 {
 822         struct nfs4_opendata *data = calldata;
 823
 824         data->rpc_status = task->tk_status;
 825         if (RPC_ASSASSINATED(task))
 826                 return;
 827         if (data->rpc_status == 0) {
 828                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 829                                 sizeof(data->o_res.stateid.data));
 830                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 831                 renew_lease(data->o_res.server, data->timestamp);
 832                 data->rpc_done = 1;
 833         }
 834 }
 835
 836 static void nfs4_open_confirm_release(void *calldata)
 837 {
 838         struct nfs4_opendata *data = calldata;
 839         struct nfs4_state *state = NULL;
 840
 841         /* If this request hasn't been cancelled, do nothing */
 842         if (data->cancelled == 0)
 843                 goto out_free;
 844         /* In case of error, no cleanup! */
 845         if (!data->rpc_done)
 846                 goto out_free;
 847         state = nfs4_opendata_to_nfs4_state(data);
 848         if (!IS_ERR(state))
 849                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 850 out_free:
 851         nfs4_opendata_put(data);
 852 }
 853
 854 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 855         .rpc_call_done = nfs4_open_confirm_done,
 856         .rpc_release = nfs4_open_confirm_release,
 857 };
 858
 859 /*
 860  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 861  */
 862 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 863 {
 864         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 865         struct rpc_task *task;
 866         struct  rpc_message msg = {
 867                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 868                 .rpc_argp = &data->c_arg,
 869                 .rpc_resp = &data->c_res,
 870                 .rpc_cred = data->owner->so_cred,
 871         };
 872         struct rpc_task_setup task_setup_data = {
 873                 .rpc_client = server->client,
 874                 .rpc_message = &msg,
 875                 .callback_ops = &nfs4_open_confirm_ops,
 876                 .callback_data = data,
 877                 .workqueue = nfsiod_workqueue,
 878                 .flags = RPC_TASK_ASYNC,
 879         };
 880         int status;
 881
 882         kref_get(&data->kref);
 883         data->rpc_done = 0;
 884         data->rpc_status = 0;
 885         data->timestamp = jiffies;
 886         task = rpc_run_task(&task_setup_data);
 887         if (IS_ERR(task))
 888                 return PTR_ERR(task);
 889         status = nfs4_wait_for_completion_rpc_task(task);
 890         if (status != 0) {
 891                 data->cancelled = 1;
 892                 smp_wmb();
 893         } else
 894                 status = data->rpc_status;
 895         rpc_put_task(task);
 896         return status;
 897 }
 898
 899 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 900 {
 901         struct nfs4_opendata *data = calldata;
 902         struct nfs4_state_owner *sp = data->owner;
 903
 904         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 905                 return;
 906         /*
 907          * Check if we still need to send an OPEN call, or if we can use
 908          * a delegation instead.
 909          */
 910         if (data->state != NULL) {
 911                 struct nfs_delegation *delegation;
 912
 913                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
 914                         goto out_no_action;
 915                 rcu_read_lock();
 916                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 917                 if (delegation != NULL &&
 918                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
 919                         rcu_read_unlock();
 920                         goto out_no_action;
 921                 }
 922                 rcu_read_unlock();
 923         }
 924         /* Update sequence id. */
 925         data->o_arg.id = sp->so_owner_id.id;
 926         data->o_arg.clientid = sp->so_client->cl_clientid;
 927         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 928                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 929                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 930         }
 931         data->timestamp = jiffies;
 932         rpc_call_start(task);
 933         return;
 934 out_no_action:
 935         task->tk_action = NULL;
 936
 937 }
 938
 939 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 940 {
 941         struct nfs4_opendata *data = calldata;
 942
 943         data->rpc_status = task->tk_status;
 944         if (RPC_ASSASSINATED(task))
 945                 return;
 946         if (task->tk_status == 0) {
 947                 switch (data->o_res.f_attr->mode & S_IFMT) {
 948                         case S_IFREG:
 949                                 break;
 950                         case S_IFLNK:
 951                                 data->rpc_status = -ELOOP;
 952                                 break;
 953                         case S_IFDIR:
 954                                 data->rpc_status = -EISDIR;
 955                                 break;
 956                         default:
 957                                 data->rpc_status = -ENOTDIR;
 958                 }
 959                 renew_lease(data->o_res.server, data->timestamp);
 960                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 961                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 962         }
 963         data->rpc_done = 1;
 964 }
 965
 966 static void nfs4_open_release(void *calldata)
 967 {
 968         struct nfs4_opendata *data = calldata;
 969         struct nfs4_state *state = NULL;
 970
 971         /* If this request hasn't been cancelled, do nothing */
 972         if (data->cancelled == 0)
 973                 goto out_free;
 974         /* In case of error, no cleanup! */
 975         if (data->rpc_status != 0 || !data->rpc_done)
 976                 goto out_free;
 977         /* In case we need an open_confirm, no cleanup! */
 978         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 979                 goto out_free;
 980         state = nfs4_opendata_to_nfs4_state(data);
 981         if (!IS_ERR(state))
 982                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 983 out_free:
 984         nfs4_opendata_put(data);
 985 }
 986
 987 static const struct rpc_call_ops nfs4_open_ops = {
 988         .rpc_call_prepare = nfs4_open_prepare,
 989         .rpc_call_done = nfs4_open_done,
 990         .rpc_release = nfs4_open_release,
 991 };
 992
 993 /*
 994  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 995  */
 996 static int _nfs4_proc_open(struct nfs4_opendata *data)
 997 {
 998         struct inode *dir = data->dir->d_inode;
 999         struct nfs_server *server = NFS_SERVER(dir);
1000         struct nfs_openargs *o_arg = &data->o_arg;
1001         struct nfs_openres *o_res = &data->o_res;
1002         struct rpc_task *task;
1003         struct rpc_message msg = {
1004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1005                 .rpc_argp = o_arg,
1006                 .rpc_resp = o_res,
1007                 .rpc_cred = data->owner->so_cred,
1008         };
1009         struct rpc_task_setup task_setup_data = {
1010                 .rpc_client = server->client,
1011                 .rpc_message = &msg,
1012                 .callback_ops = &nfs4_open_ops,
1013                 .callback_data = data,
1014                 .workqueue = nfsiod_workqueue,
1015                 .flags = RPC_TASK_ASYNC,
1016         };
1017         int status;
1018
1019         kref_get(&data->kref);
1020         data->rpc_done = 0;
1021         data->rpc_status = 0;
1022         data->cancelled = 0;
1023         task = rpc_run_task(&task_setup_data);
1024         if (IS_ERR(task))
1025                 return PTR_ERR(task);
1026         status = nfs4_wait_for_completion_rpc_task(task);
1027         if (status != 0) {
1028                 data->cancelled = 1;
1029                 smp_wmb();
1030         } else
1031                 status = data->rpc_status;
1032         rpc_put_task(task);
1033         if (status != 0 || !data->rpc_done)
1034                 return status;
1035
1036         if (o_res->fh.size == 0)
1037                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1038
1039         if (o_arg->open_flags & O_CREAT) {
1040                 update_changeattr(dir, &o_res->cinfo);
1041                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1042         } else
1043                 nfs_refresh_inode(dir, o_res->dir_attr);
1044         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1045                 status = _nfs4_proc_open_confirm(data);
1046                 if (status != 0)
1047                         return status;
1048         }
1049         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1050                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1051         return 0;
1052 }
1053
1054 static int nfs4_recover_expired_lease(struct nfs_server *server)
1055 {
1056         struct nfs_client *clp = server->nfs_client;
1057         int ret;
1058
1059         for (;;) {
1060                 ret = nfs4_wait_clnt_recover(clp);
1061                 if (ret != 0)
1062                         return ret;
1063                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1064                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1065                         break;
1066                 nfs4_schedule_state_recovery(clp);
1067         }
1068         return 0;
1069 }
1070
1071 /*
1072  * OPEN_EXPIRED:
1073  *      reclaim state on the server after a network partition.
1074  *      Assumes caller holds the appropriate lock
1075  */
1076 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1077 {
1078         struct nfs4_opendata *opendata;
1079         int ret;
1080
1081         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1082         if (IS_ERR(opendata))
1083                 return PTR_ERR(opendata);
1084         ret = nfs4_open_recover(opendata, state);
1085         if (ret == -ESTALE)
1086                 d_drop(ctx->path.dentry);
1087         nfs4_opendata_put(opendata);
1088         return ret;
1089 }
1090
1091 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1092 {
1093         struct nfs_server *server = NFS_SERVER(state->inode);
1094         struct nfs4_exception exception = { };
1095         int err;
1096
1097         do {
1098                 err = _nfs4_open_expired(ctx, state);
1099                 if (err != -NFS4ERR_DELAY)
1100                         break;
1101                 nfs4_handle_exception(server, err, &exception);
1102         } while (exception.retry);
1103         return err;
1104 }
1105
1106 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1107 {
1108         struct nfs_open_context *ctx;
1109         int ret;
1110
1111         ctx = nfs4_state_find_open_context(state);
1112         if (IS_ERR(ctx))
1113                 return PTR_ERR(ctx);
1114         ret = nfs4_do_open_expired(ctx, state);
1115         put_nfs_open_context(ctx);
1116         return ret;
1117 }
1118
1119 /*
1120  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1121  * fields corresponding to attributes that were used to store the verifier.
1122  * Make sure we clobber those fields in the later setattr call
1123  */
1124 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1125 {
1126         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1127             !(sattr->ia_valid & ATTR_ATIME_SET))
1128                 sattr->ia_valid |= ATTR_ATIME;
1129
1130         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1131             !(sattr->ia_valid & ATTR_MTIME_SET))
1132                 sattr->ia_valid |= ATTR_MTIME;
1133 }
1134
1135 /*
1136  * Returns a referenced nfs4_state
1137  */
1138 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1139 {
1140         struct nfs4_state_owner  *sp;
1141         struct nfs4_state     *state = NULL;
1142         struct nfs_server       *server = NFS_SERVER(dir);
1143         struct nfs4_opendata *opendata;
1144         int status;
1145
1146         /* Protect against reboot recovery conflicts */
1147         status = -ENOMEM;
1148         if (!(sp = nfs4_get_state_owner(server, cred))) {
1149                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1150                 goto out_err;
1151         }
1152         status = nfs4_recover_expired_lease(server);
1153         if (status != 0)
1154                 goto err_put_state_owner;
1155         if (path->dentry->d_inode != NULL)
1156                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1157         status = -ENOMEM;
1158         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1159         if (opendata == NULL)
1160                 goto err_put_state_owner;
1161
1162         if (path->dentry->d_inode != NULL)
1163                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1164
1165         status = _nfs4_proc_open(opendata);
1166         if (status != 0)
1167                 goto err_opendata_put;
1168
1169         if (opendata->o_arg.open_flags & O_EXCL)
1170                 nfs4_exclusive_attrset(opendata, sattr);
1171
1172         state = nfs4_opendata_to_nfs4_state(opendata);
1173         status = PTR_ERR(state);
1174         if (IS_ERR(state))
1175                 goto err_opendata_put;
1176         nfs4_opendata_put(opendata);
1177         nfs4_put_state_owner(sp);
1178         *res = state;
1179         return 0;
1180 err_opendata_put:
1181         nfs4_opendata_put(opendata);
1182 err_put_state_owner:
1183         nfs4_put_state_owner(sp);
1184 out_err:
1185         *res = NULL;
1186         return status;
1187 }
1188
1189
1190 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1191 {
1192         struct nfs4_exception exception = { };
1193         struct nfs4_state *res;
1194         int status;
1195
1196         do {
1197                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1198                 if (status == 0)
1199                         break;
1200                 /* NOTE: BAD_SEQID means the server and client disagree about the
1201                  * book-keeping w.r.t. state-changing operations
1202                  * (OPEN/CLOSE/LOCK/LOCKU...)
1203                  * It is actually a sign of a bug on the client or on the server.
1204                  *
1205                  * If we receive a BAD_SEQID error in the particular case of
1206                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1207                  * have unhashed the old state_owner for us, and that we can
1208                  * therefore safely retry using a new one. We should still warn
1209                  * the user though...
1210                  */
1211                 if (status == -NFS4ERR_BAD_SEQID) {
1212                         printk(KERN_WARNING "NFS: v4 server %s "
1213                                         " returned a bad sequence-id error!\n",
1214                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1215                         exception.retry = 1;
1216                         continue;
1217                 }
1218                 /*
1219                  * BAD_STATEID on OPEN means that the server cancelled our
1220                  * state before it received the OPEN_CONFIRM.
1221                  * Recover by retrying the request as per the discussion
1222                  * on Page 181 of RFC3530.
1223                  */
1224                 if (status == -NFS4ERR_BAD_STATEID) {
1225                         exception.retry = 1;
1226                         continue;
1227                 }
1228                 if (status == -EAGAIN) {
1229                         /* We must have found a delegation */
1230                         exception.retry = 1;
1231                         continue;
1232                 }
1233                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1234                                         status, &exception));
1235         } while (exception.retry);
1236         return res;
1237 }
1238
1239 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1240                             struct nfs_fattr *fattr, struct iattr *sattr,
1241                             struct nfs4_state *state)
1242 {
1243         struct nfs_server *server = NFS_SERVER(inode);
1244         struct nfs_setattrargs  arg = {
1245                 .fh             = NFS_FH(inode),
1246                 .iap            = sattr,
1247                 .server         = server,
1248                 .bitmask = server->attr_bitmask,
1249         };
1250         struct nfs_setattrres  res = {
1251                 .fattr          = fattr,
1252                 .server         = server,
1253         };
1254         struct rpc_message msg = {
1255                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1256                 .rpc_argp       = &arg,
1257                 .rpc_resp       = &res,
1258                 .rpc_cred       = cred,
1259         };
1260         unsigned long timestamp = jiffies;
1261         int status;
1262
1263         nfs_fattr_init(fattr);
1264
1265         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1266                 /* Use that stateid */
1267         } else if (state != NULL) {
1268                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1269         } else
1270                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1271
1272         status = rpc_call_sync(server->client, &msg, 0);
1273         if (status == 0 && state != NULL)
1274                 renew_lease(server, timestamp);
1275         return status;
1276 }
1277
1278 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1279                            struct nfs_fattr *fattr, struct iattr *sattr,
1280                            struct nfs4_state *state)
1281 {
1282         struct nfs_server *server = NFS_SERVER(inode);
1283         struct nfs4_exception exception = { };
1284         int err;
1285         do {
1286                 err = nfs4_handle_exception(server,
1287                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1288                                 &exception);
1289         } while (exception.retry);
1290         return err;
1291 }
1292
1293 struct nfs4_closedata {
1294         struct path path;
1295         struct inode *inode;
1296         struct nfs4_state *state;
1297         struct nfs_closeargs arg;
1298         struct nfs_closeres res;
1299         struct nfs_fattr fattr;
1300         unsigned long timestamp;
1301 };
1302
1303 static void nfs4_free_closedata(void *data)
1304 {
1305         struct nfs4_closedata *calldata = data;
1306         struct nfs4_state_owner *sp = calldata->state->owner;
1307
1308         nfs4_put_open_state(calldata->state);
1309         nfs_free_seqid(calldata->arg.seqid);
1310         nfs4_put_state_owner(sp);
1311         path_put(&calldata->path);
1312         kfree(calldata);
1313 }
1314
1315 static void nfs4_close_done(struct rpc_task *task, void *data)
1316 {
1317         struct nfs4_closedata *calldata = data;
1318         struct nfs4_state *state = calldata->state;
1319         struct nfs_server *server = NFS_SERVER(calldata->inode);
1320
1321         if (RPC_ASSASSINATED(task))
1322                 return;
1323         /* hmm. we are done with the inode, and in the process of freeing
1324          * the state_owner. we keep this around to process errors
1325          */
1326         switch (task->tk_status) {
1327                 case 0:
1328                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1329                         renew_lease(server, calldata->timestamp);
1330                         break;
1331                 case -NFS4ERR_STALE_STATEID:
1332                 case -NFS4ERR_OLD_STATEID:
1333                 case -NFS4ERR_BAD_STATEID:
1334                 case -NFS4ERR_EXPIRED:
1335                         if (calldata->arg.fmode == 0)
1336                                 break;
1337                 default:
1338                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1339                                 rpc_restart_call(task);
1340                                 return;
1341                         }
1342         }
1343         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1344 }
1345
1346 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1347 {
1348         struct nfs4_closedata *calldata = data;
1349         struct nfs4_state *state = calldata->state;
1350         int clear_rd, clear_wr, clear_rdwr;
1351
1352         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1353                 return;
1354
1355         clear_rd = clear_wr = clear_rdwr = 0;
1356         spin_lock(&state->owner->so_lock);
1357         /* Calculate the change in open mode */
1358         if (state->n_rdwr == 0) {
1359                 if (state->n_rdonly == 0) {
1360                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1361                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1362                 }
1363                 if (state->n_wronly == 0) {
1364                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1365                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1366                 }
1367         }
1368         spin_unlock(&state->owner->so_lock);
1369         if (!clear_rd && !clear_wr && !clear_rdwr) {
1370                 /* Note: exit _without_ calling nfs4_close_done */
1371                 task->tk_action = NULL;
1372                 return;
1373         }
1374         nfs_fattr_init(calldata->res.fattr);
1375         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1376                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1377                 calldata->arg.fmode = FMODE_READ;
1378         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1379                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1380                 calldata->arg.fmode = FMODE_WRITE;
1381         }
1382         calldata->timestamp = jiffies;
1383         rpc_call_start(task);
1384 }
1385
1386 static const struct rpc_call_ops nfs4_close_ops = {
1387         .rpc_call_prepare = nfs4_close_prepare,
1388         .rpc_call_done = nfs4_close_done,
1389         .rpc_release = nfs4_free_closedata,
1390 };
1391
1392 /*
1393  * It is possible for data to be read/written from a mem-mapped file
1394  * after the sys_close call (which hits the vfs layer as a flush).
1395  * This means that we can't safely call nfsv4 close on a file until
1396  * the inode is cleared. This in turn means that we are not good
1397  * NFSv4 citizens - we do not indicate to the server to update the file's
1398  * share state even when we are done with one of the three share
1399  * stateid's in the inode.
1400  *
1401  * NOTE: Caller must be holding the sp->so_owner semaphore!
1402  */
1403 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1404 {
1405         struct nfs_server *server = NFS_SERVER(state->inode);
1406         struct nfs4_closedata *calldata;
1407         struct nfs4_state_owner *sp = state->owner;
1408         struct rpc_task *task;
1409         struct rpc_message msg = {
1410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1411                 .rpc_cred = state->owner->so_cred,
1412         };
1413         struct rpc_task_setup task_setup_data = {
1414                 .rpc_client = server->client,
1415                 .rpc_message = &msg,
1416                 .callback_ops = &nfs4_close_ops,
1417                 .workqueue = nfsiod_workqueue,
1418                 .flags = RPC_TASK_ASYNC,
1419         };
1420         int status = -ENOMEM;
1421
1422         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1423         if (calldata == NULL)
1424                 goto out;
1425         calldata->inode = state->inode;
1426         calldata->state = state;
1427         calldata->arg.fh = NFS_FH(state->inode);
1428         calldata->arg.stateid = &state->open_stateid;
1429         /* Serialization for the sequence id */
1430         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1431         if (calldata->arg.seqid == NULL)
1432                 goto out_free_calldata;
1433         calldata->arg.fmode = 0;
1434         calldata->arg.bitmask = server->cache_consistency_bitmask;
1435         calldata->res.fattr = &calldata->fattr;
1436         calldata->res.seqid = calldata->arg.seqid;
1437         calldata->res.server = server;
1438         calldata->path.mnt = mntget(path->mnt);
1439         calldata->path.dentry = dget(path->dentry);
1440
1441         msg.rpc_argp = &calldata->arg,
1442         msg.rpc_resp = &calldata->res,
1443         task_setup_data.callback_data = calldata;
1444         task = rpc_run_task(&task_setup_data);
1445         if (IS_ERR(task))
1446                 return PTR_ERR(task);
1447         status = 0;
1448         if (wait)
1449                 status = rpc_wait_for_completion_task(task);
1450         rpc_put_task(task);
1451         return status;
1452 out_free_calldata:
1453         kfree(calldata);
1454 out:
1455         nfs4_put_open_state(state);
1456         nfs4_put_state_owner(sp);
1457         return status;
1458 }
1459
1460 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1461 {
1462         struct file *filp;
1463         int ret;
1464
1465         /* If the open_intent is for execute, we have an extra check to make */
1466         if (fmode & FMODE_EXEC) {
1467                 ret = nfs_may_open(state->inode,
1468                                 state->owner->so_cred,
1469                                 nd->intent.open.flags);
1470                 if (ret < 0)
1471                         goto out_close;
1472         }
1473         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1474         if (!IS_ERR(filp)) {
1475                 struct nfs_open_context *ctx;
1476                 ctx = nfs_file_open_context(filp);
1477                 ctx->state = state;
1478                 return 0;
1479         }
1480         ret = PTR_ERR(filp);
1481 out_close:
1482         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1483         return ret;
1484 }
1485
1486 struct dentry *
1487 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1488 {
1489         struct path path = {
1490                 .mnt = nd->path.mnt,
1491                 .dentry = dentry,
1492         };
1493         struct dentry *parent;
1494         struct iattr attr;
1495         struct rpc_cred *cred;
1496         struct nfs4_state *state;
1497         struct dentry *res;
1498         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1499
1500         if (nd->flags & LOOKUP_CREATE) {
1501                 attr.ia_mode = nd->intent.open.create_mode;
1502                 attr.ia_valid = ATTR_MODE;
1503                 if (!IS_POSIXACL(dir))
1504                         attr.ia_mode &= ~current_umask();
1505         } else {
1506                 attr.ia_valid = 0;
1507                 BUG_ON(nd->intent.open.flags & O_CREAT);
1508         }
1509
1510         cred = rpc_lookup_cred();
1511         if (IS_ERR(cred))
1512                 return (struct dentry *)cred;
1513         parent = dentry->d_parent;
1514         /* Protect against concurrent sillydeletes */
1515         nfs_block_sillyrename(parent);
1516         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1517         put_rpccred(cred);
1518         if (IS_ERR(state)) {
1519                 if (PTR_ERR(state) == -ENOENT) {
1520                         d_add(dentry, NULL);
1521                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1522                 }
1523                 nfs_unblock_sillyrename(parent);
1524                 return (struct dentry *)state;
1525         }
1526         res = d_add_unique(dentry, igrab(state->inode));
1527         if (res != NULL)
1528                 path.dentry = res;
1529         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1530         nfs_unblock_sillyrename(parent);
1531         nfs4_intent_set_file(nd, &path, state, fmode);
1532         return res;
1533 }
1534
1535 int
1536 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1537 {
1538         struct path path = {
1539                 .mnt = nd->path.mnt,
1540                 .dentry = dentry,
1541         };
1542         struct rpc_cred *cred;
1543         struct nfs4_state *state;
1544         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1545
1546         cred = rpc_lookup_cred();
1547         if (IS_ERR(cred))
1548                 return PTR_ERR(cred);
1549         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1550         put_rpccred(cred);
1551         if (IS_ERR(state)) {
1552                 switch (PTR_ERR(state)) {
1553                         case -EPERM:
1554                         case -EACCES:
1555                         case -EDQUOT:
1556                         case -ENOSPC:
1557                         case -EROFS:
1558                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1559                                 return 1;
1560                         default:
1561                                 goto out_drop;
1562                 }
1563         }
1564         if (state->inode == dentry->d_inode) {
1565                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1566                 nfs4_intent_set_file(nd, &path, state, fmode);
1567                 return 1;
1568         }
1569         nfs4_close_sync(&path, state, fmode);
1570 out_drop:
1571         d_drop(dentry);
1572         return 0;
1573 }
1574
1575 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1576 {
1577         if (ctx->state == NULL)
1578                 return;
1579         if (is_sync)
1580                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1581         else
1582                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1583 }
1584
1585 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1586 {
1587         struct nfs4_server_caps_res res = {};
1588         struct rpc_message msg = {
1589                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1590                 .rpc_argp = fhandle,
1591                 .rpc_resp = &res,
1592         };
1593         int status;
1594
1595         status = rpc_call_sync(server->client, &msg, 0);
1596         if (status == 0) {
1597                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1598                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1599                         server->caps |= NFS_CAP_ACLS;
1600                 if (res.has_links != 0)
1601                         server->caps |= NFS_CAP_HARDLINKS;
1602                 if (res.has_symlinks != 0)
1603                         server->caps |= NFS_CAP_SYMLINKS;
1604                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
1605                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
1606                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1607                 server->acl_bitmask = res.acl_bitmask;
1608         }
1609         return status;
1610 }
1611
1612 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1613 {
1614         struct nfs4_exception exception = { };
1615         int err;
1616         do {
1617                 err = nfs4_handle_exception(server,
1618                                 _nfs4_server_capabilities(server, fhandle),
1619                                 &exception);
1620         } while (exception.retry);
1621         return err;
1622 }
1623
1624 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1625                 struct nfs_fsinfo *info)
1626 {
1627         struct nfs4_lookup_root_arg args = {
1628                 .bitmask = nfs4_fattr_bitmap,
1629         };
1630         struct nfs4_lookup_res res = {
1631                 .server = server,
1632                 .fattr = info->fattr,
1633                 .fh = fhandle,
1634         };
1635         struct rpc_message msg = {
1636                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1637                 .rpc_argp = &args,
1638                 .rpc_resp = &res,
1639         };
1640         nfs_fattr_init(info->fattr);
1641         return rpc_call_sync(server->client, &msg, 0);
1642 }
1643
1644 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1645                 struct nfs_fsinfo *info)
1646 {
1647         struct nfs4_exception exception = { };
1648         int err;
1649         do {
1650                 err = nfs4_handle_exception(server,
1651                                 _nfs4_lookup_root(server, fhandle, info),
1652                                 &exception);
1653         } while (exception.retry);
1654         return err;
1655 }
1656
1657 /*
1658  * get the file handle for the "/" directory on the server
1659  */
1660 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1661                               struct nfs_fsinfo *info)
1662 {
1663         int status;
1664
1665         status = nfs4_lookup_root(server, fhandle, info);
1666         if (status == 0)
1667                 status = nfs4_server_capabilities(server, fhandle);
1668         if (status == 0)
1669                 status = nfs4_do_fsinfo(server, fhandle, info);
1670         return nfs4_map_errors(status);
1671 }
1672
1673 /*
1674  * Get locations and (maybe) other attributes of a referral.
1675  * Note that we'll actually follow the referral later when
1676  * we detect fsid mismatch in inode revalidation
1677  */
1678 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1679 {
1680         int status = -ENOMEM;
1681         struct page *page = NULL;
1682         struct nfs4_fs_locations *locations = NULL;
1683
1684         page = alloc_page(GFP_KERNEL);
1685         if (page == NULL)
1686                 goto out;
1687         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1688         if (locations == NULL)
1689                 goto out;
1690
1691         status = nfs4_proc_fs_locations(dir, name, locations, page);
1692         if (status != 0)
1693                 goto out;
1694         /* Make sure server returned a different fsid for the referral */
1695         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1696                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
1697                 status = -EIO;
1698                 goto out;
1699         }
1700
1701         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1702         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1703         if (!fattr->mode)
1704                 fattr->mode = S_IFDIR;
1705         memset(fhandle, 0, sizeof(struct nfs_fh));
1706 out:
1707         if (page)
1708                 __free_page(page);
1709         if (locations)
1710                 kfree(locations);
1711         return status;
1712 }
1713
1714 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1715 {
1716         struct nfs4_getattr_arg args = {
1717                 .fh = fhandle,
1718                 .bitmask = server->attr_bitmask,
1719         };
1720         struct nfs4_getattr_res res = {
1721                 .fattr = fattr,
1722                 .server = server,
1723         };
1724         struct rpc_message msg = {
1725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1726                 .rpc_argp = &args,
1727                 .rpc_resp = &res,
1728         };
1729
1730         nfs_fattr_init(fattr);
1731         return rpc_call_sync(server->client, &msg, 0);
1732 }
1733
1734 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1735 {
1736         struct nfs4_exception exception = { };
1737         int err;
1738         do {
1739                 err = nfs4_handle_exception(server,
1740                                 _nfs4_proc_getattr(server, fhandle, fattr),
1741                                 &exception);
1742         } while (exception.retry);
1743         return err;
1744 }
1745
1746 /*
1747  * The file is not closed if it is opened due to the a request to change
1748  * the size of the file. The open call will not be needed once the
1749  * VFS layer lookup-intents are implemented.
1750  *
1751  * Close is called when the inode is destroyed.
1752  * If we haven't opened the file for O_WRONLY, we
1753  * need to in the size_change case to obtain a stateid.
1754  *
1755  * Got race?
1756  * Because OPEN is always done by name in nfsv4, it is
1757  * possible that we opened a different file by the same
1758  * name.  We can recognize this race condition, but we
1759  * can't do anything about it besides returning an error.
1760  *
1761  * This will be fixed with VFS changes (lookup-intent).
1762  */
1763 static int
1764 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1765                   struct iattr *sattr)
1766 {
1767         struct inode *inode = dentry->d_inode;
1768         struct rpc_cred *cred = NULL;
1769         struct nfs4_state *state = NULL;
1770         int status;
1771
1772         nfs_fattr_init(fattr);
1773
1774         /* Search for an existing open(O_WRITE) file */
1775         if (sattr->ia_valid & ATTR_FILE) {
1776                 struct nfs_open_context *ctx;
1777
1778                 ctx = nfs_file_open_context(sattr->ia_file);
1779                 if (ctx) {
1780                         cred = ctx->cred;
1781                         state = ctx->state;
1782                 }
1783         }
1784
1785         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
1786         if (status == 0)
1787                 nfs_setattr_update_inode(inode, sattr);
1788         return status;
1789 }
1790
1791 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1792                 const struct qstr *name, struct nfs_fh *fhandle,
1793                 struct nfs_fattr *fattr)
1794 {
1795         int                    status;
1796         struct nfs4_lookup_arg args = {
1797                 .bitmask = server->attr_bitmask,
1798                 .dir_fh = dirfh,
1799                 .name = name,
1800         };
1801         struct nfs4_lookup_res res = {
1802                 .server = server,
1803                 .fattr = fattr,
1804                 .fh = fhandle,
1805         };
1806         struct rpc_message msg = {
1807                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1808                 .rpc_argp = &args,
1809                 .rpc_resp = &res,
1810         };
1811
1812         nfs_fattr_init(fattr);
1813
1814         dprintk("NFS call  lookupfh %s\n", name->name);
1815         status = rpc_call_sync(server->client, &msg, 0);
1816         dprintk("NFS reply lookupfh: %d\n", status);
1817         return status;
1818 }
1819
1820 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1821                               struct qstr *name, struct nfs_fh *fhandle,
1822                               struct nfs_fattr *fattr)
1823 {
1824         struct nfs4_exception exception = { };
1825         int err;
1826         do {
1827                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1828                 /* FIXME: !!!! */
1829                 if (err == -NFS4ERR_MOVED) {
1830                         err = -EREMOTE;
1831                         break;
1832                 }
1833                 err = nfs4_handle_exception(server, err, &exception);
1834         } while (exception.retry);
1835         return err;
1836 }
1837
1838 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1839                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1840 {
1841         int status;
1842
1843         dprintk("NFS call  lookup %s\n", name->name);
1844         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1845         if (status == -NFS4ERR_MOVED)
1846                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1847         dprintk("NFS reply lookup: %d\n", status);
1848         return status;
1849 }
1850
1851 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1852 {
1853         struct nfs4_exception exception = { };
1854         int err;
1855         do {
1856                 err = nfs4_handle_exception(NFS_SERVER(dir),
1857                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1858                                 &exception);
1859         } while (exception.retry);
1860         return err;
1861 }
1862
1863 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1864 {
1865         struct nfs_server *server = NFS_SERVER(inode);
1866         struct nfs_fattr fattr;
1867         struct nfs4_accessargs args = {
1868                 .fh = NFS_FH(inode),
1869                 .bitmask = server->attr_bitmask,
1870         };
1871         struct nfs4_accessres res = {
1872                 .server = server,
1873                 .fattr = &fattr,
1874         };
1875         struct rpc_message msg = {
1876                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1877                 .rpc_argp = &args,
1878                 .rpc_resp = &res,
1879                 .rpc_cred = entry->cred,
1880         };
1881         int mode = entry->mask;
1882         int status;
1883
1884         /*
1885          * Determine which access bits we want to ask for...
1886          */
1887         if (mode & MAY_READ)
1888                 args.access |= NFS4_ACCESS_READ;
1889         if (S_ISDIR(inode->i_mode)) {
1890                 if (mode & MAY_WRITE)
1891                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1892                 if (mode & MAY_EXEC)
1893                         args.access |= NFS4_ACCESS_LOOKUP;
1894         } else {
1895                 if (mode & MAY_WRITE)
1896                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1897                 if (mode & MAY_EXEC)
1898                         args.access |= NFS4_ACCESS_EXECUTE;
1899         }
1900         nfs_fattr_init(&fattr);
1901         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1902         if (!status) {
1903                 entry->mask = 0;
1904                 if (res.access & NFS4_ACCESS_READ)
1905                         entry->mask |= MAY_READ;
1906                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1907                         entry->mask |= MAY_WRITE;
1908                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1909                         entry->mask |= MAY_EXEC;
1910                 nfs_refresh_inode(inode, &fattr);
1911         }
1912         return status;
1913 }
1914
1915 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1916 {
1917         struct nfs4_exception exception = { };
1918         int err;
1919         do {
1920                 err = nfs4_handle_exception(NFS_SERVER(inode),
1921                                 _nfs4_proc_access(inode, entry),
1922                                 &exception);
1923         } while (exception.retry);
1924         return err;
1925 }
1926
1927 /*
1928  * TODO: For the time being, we don't try to get any attributes
1929  * along with any of the zero-copy operations READ, READDIR,
1930  * READLINK, WRITE.
1931  *
1932  * In the case of the first three, we want to put the GETATTR
1933  * after the read-type operation -- this is because it is hard
1934  * to predict the length of a GETATTR response in v4, and thus
1935  * align the READ data correctly.  This means that the GETATTR
1936  * may end up partially falling into the page cache, and we should
1937  * shift it into the 'tail' of the xdr_buf before processing.
1938  * To do this efficiently, we need to know the total length
1939  * of data received, which doesn't seem to be available outside
1940  * of the RPC layer.
1941  *
1942  * In the case of WRITE, we also want to put the GETATTR after
1943  * the operation -- in this case because we want to make sure
1944  * we get the post-operation mtime and size.  This means that
1945  * we can't use xdr_encode_pages() as written: we need a variant
1946  * of it which would leave room in the 'tail' iovec.
1947  *
1948  * Both of these changes to the XDR layer would in fact be quite
1949  * minor, but I decided to leave them for a subsequent patch.
1950  */
1951 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1952                 unsigned int pgbase, unsigned int pglen)
1953 {
1954         struct nfs4_readlink args = {
1955                 .fh       = NFS_FH(inode),
1956                 .pgbase   = pgbase,
1957                 .pglen    = pglen,
1958                 .pages    = &page,
1959         };
1960         struct rpc_message msg = {
1961                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1962                 .rpc_argp = &args,
1963                 .rpc_resp = NULL,
1964         };
1965
1966         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1967 }
1968
1969 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1970                 unsigned int pgbase, unsigned int pglen)
1971 {
1972         struct nfs4_exception exception = { };
1973         int err;
1974         do {
1975                 err = nfs4_handle_exception(NFS_SERVER(inode),
1976                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1977                                 &exception);
1978         } while (exception.retry);
1979         return err;
1980 }
1981
1982 /*
1983  * Got race?
1984  * We will need to arrange for the VFS layer to provide an atomic open.
1985  * Until then, this create/open method is prone to inefficiency and race
1986  * conditions due to the lookup, create, and open VFS calls from sys_open()
1987  * placed on the wire.
1988  *
1989  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1990  * The file will be opened again in the subsequent VFS open call
1991  * (nfs4_proc_file_open).
1992  *
1993  * The open for read will just hang around to be used by any process that
1994  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1995  */
1996
1997 static int
1998 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1999                  int flags, struct nameidata *nd)
2000 {
2001         struct path path = {
2002                 .mnt = nd->path.mnt,
2003                 .dentry = dentry,
2004         };
2005         struct nfs4_state *state;
2006         struct rpc_cred *cred;
2007         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2008         int status = 0;
2009
2010         cred = rpc_lookup_cred();
2011         if (IS_ERR(cred)) {
2012                 status = PTR_ERR(cred);
2013                 goto out;
2014         }
2015         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2016         d_drop(dentry);
2017         if (IS_ERR(state)) {
2018                 status = PTR_ERR(state);
2019                 goto out_putcred;
2020         }
2021         d_add(dentry, igrab(state->inode));
2022         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2023         if (flags & O_EXCL) {
2024                 struct nfs_fattr fattr;
2025                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2026                 if (status == 0)
2027                         nfs_setattr_update_inode(state->inode, sattr);
2028                 nfs_post_op_update_inode(state->inode, &fattr);
2029         }
2030         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2031                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2032         else
2033                 nfs4_close_sync(&path, state, fmode);
2034 out_putcred:
2035         put_rpccred(cred);
2036 out:
2037         return status;
2038 }
2039
2040 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2041 {
2042         struct nfs_server *server = NFS_SERVER(dir);
2043         struct nfs_removeargs args = {
2044                 .fh = NFS_FH(dir),
2045                 .name.len = name->len,
2046                 .name.name = name->name,
2047                 .bitmask = server->attr_bitmask,
2048         };
2049         struct nfs_removeres res = {
2050                 .server = server,
2051         };
2052         struct rpc_message msg = {
2053                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2054                 .rpc_argp = &args,
2055                 .rpc_resp = &res,
2056         };
2057         int                     status;
2058
2059         nfs_fattr_init(&res.dir_attr);
2060         status = rpc_call_sync(server->client, &msg, 0);
2061         if (status == 0) {
2062                 update_changeattr(dir, &res.cinfo);
2063                 nfs_post_op_update_inode(dir, &res.dir_attr);
2064         }
2065         return status;
2066 }
2067
2068 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2069 {
2070         struct nfs4_exception exception = { };
2071         int err;
2072         do {
2073                 err = nfs4_handle_exception(NFS_SERVER(dir),
2074                                 _nfs4_proc_remove(dir, name),
2075                                 &exception);
2076         } while (exception.retry);
2077         return err;
2078 }
2079
2080 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2081 {
2082         struct nfs_server *server = NFS_SERVER(dir);
2083         struct nfs_removeargs *args = msg->rpc_argp;
2084         struct nfs_removeres *res = msg->rpc_resp;
2085
2086         args->bitmask = server->cache_consistency_bitmask;
2087         res->server = server;
2088         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2089 }
2090
2091 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2092 {
2093         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2094
2095         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2096                 return 0;
2097         update_changeattr(dir, &res->cinfo);
2098         nfs_post_op_update_inode(dir, &res->dir_attr);
2099         return 1;
2100 }
2101
2102 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2103                 struct inode *new_dir, struct qstr *new_name)
2104 {
2105         struct nfs_server *server = NFS_SERVER(old_dir);
2106         struct nfs4_rename_arg arg = {
2107                 .old_dir = NFS_FH(old_dir),
2108                 .new_dir = NFS_FH(new_dir),
2109                 .old_name = old_name,
2110                 .new_name = new_name,
2111                 .bitmask = server->attr_bitmask,
2112         };
2113         struct nfs_fattr old_fattr, new_fattr;
2114         struct nfs4_rename_res res = {
2115                 .server = server,
2116                 .old_fattr = &old_fattr,
2117                 .new_fattr = &new_fattr,
2118         };
2119         struct rpc_message msg = {
2120                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2121                 .rpc_argp = &arg,
2122                 .rpc_resp = &res,
2123         };
2124         int                     status;
2125
2126         nfs_fattr_init(res.old_fattr);
2127         nfs_fattr_init(res.new_fattr);
2128         status = rpc_call_sync(server->client, &msg, 0);
2129
2130         if (!status) {
2131                 update_changeattr(old_dir, &res.old_cinfo);
2132                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2133                 update_changeattr(new_dir, &res.new_cinfo);
2134                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2135         }
2136         return status;
2137 }
2138
2139 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2140                 struct inode *new_dir, struct qstr *new_name)
2141 {
2142         struct nfs4_exception exception = { };
2143         int err;
2144         do {
2145                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2146                                 _nfs4_proc_rename(old_dir, old_name,
2147                                         new_dir, new_name),
2148                                 &exception);
2149         } while (exception.retry);
2150         return err;
2151 }
2152
2153 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2154 {
2155         struct nfs_server *server = NFS_SERVER(inode);
2156         struct nfs4_link_arg arg = {
2157                 .fh     = NFS_FH(inode),
2158                 .dir_fh = NFS_FH(dir),
2159                 .name   = name,
2160                 .bitmask = server->attr_bitmask,
2161         };
2162         struct nfs_fattr fattr, dir_attr;
2163         struct nfs4_link_res res = {
2164                 .server = server,
2165                 .fattr = &fattr,
2166                 .dir_attr = &dir_attr,
2167         };
2168         struct rpc_message msg = {
2169                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2170                 .rpc_argp = &arg,
2171                 .rpc_resp = &res,
2172         };
2173         int                     status;
2174
2175         nfs_fattr_init(res.fattr);
2176         nfs_fattr_init(res.dir_attr);
2177         status = rpc_call_sync(server->client, &msg, 0);
2178         if (!status) {
2179                 update_changeattr(dir, &res.cinfo);
2180                 nfs_post_op_update_inode(dir, res.dir_attr);
2181                 nfs_post_op_update_inode(inode, res.fattr);
2182         }
2183
2184         return status;
2185 }
2186
2187 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2188 {
2189         struct nfs4_exception exception = { };
2190         int err;
2191         do {
2192                 err = nfs4_handle_exception(NFS_SERVER(inode),
2193                                 _nfs4_proc_link(inode, dir, name),
2194                                 &exception);
2195         } while (exception.retry);
2196         return err;
2197 }
2198
2199 struct nfs4_createdata {
2200         struct rpc_message msg;
2201         struct nfs4_create_arg arg;
2202         struct nfs4_create_res res;
2203         struct nfs_fh fh;
2204         struct nfs_fattr fattr;
2205         struct nfs_fattr dir_fattr;
2206 };
2207
2208 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2209                 struct qstr *name, struct iattr *sattr, u32 ftype)
2210 {
2211         struct nfs4_createdata *data;
2212
2213         data = kzalloc(sizeof(*data), GFP_KERNEL);
2214         if (data != NULL) {
2215                 struct nfs_server *server = NFS_SERVER(dir);
2216
2217                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2218                 data->msg.rpc_argp = &data->arg;
2219                 data->msg.rpc_resp = &data->res;
2220                 data->arg.dir_fh = NFS_FH(dir);
2221                 data->arg.server = server;
2222                 data->arg.name = name;
2223                 data->arg.attrs = sattr;
2224                 data->arg.ftype = ftype;
2225                 data->arg.bitmask = server->attr_bitmask;
2226                 data->res.server = server;
2227                 data->res.fh = &data->fh;
2228                 data->res.fattr = &data->fattr;
2229                 data->res.dir_fattr = &data->dir_fattr;
2230                 nfs_fattr_init(data->res.fattr);
2231                 nfs_fattr_init(data->res.dir_fattr);
2232         }
2233         return data;
2234 }
2235
2236 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2237 {
2238         int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2239         if (status == 0) {
2240                 update_changeattr(dir, &data->res.dir_cinfo);
2241                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2242                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2243         }
2244         return status;
2245 }
2246
2247 static void nfs4_free_createdata(struct nfs4_createdata *data)
2248 {
2249         kfree(data);
2250 }
2251
2252 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2253                 struct page *page, unsigned int len, struct iattr *sattr)
2254 {
2255         struct nfs4_createdata *data;
2256         int status = -ENAMETOOLONG;
2257
2258         if (len > NFS4_MAXPATHLEN)
2259                 goto out;
2260
2261         status = -ENOMEM;
2262         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2263         if (data == NULL)
2264                 goto out;
2265
2266         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2267         data->arg.u.symlink.pages = &page;
2268         data->arg.u.symlink.len = len;
2269
2270         status = nfs4_do_create(dir, dentry, data);
2271
2272         nfs4_free_createdata(data);
2273 out:
2274         return status;
2275 }
2276
2277 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2278                 struct page *page, unsigned int len, struct iattr *sattr)
2279 {
2280         struct nfs4_exception exception = { };
2281         int err;
2282         do {
2283                 err = nfs4_handle_exception(NFS_SERVER(dir),
2284                                 _nfs4_proc_symlink(dir, dentry, page,
2285                                                         len, sattr),
2286                                 &exception);
2287         } while (exception.retry);
2288         return err;
2289 }
2290
2291 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2292                 struct iattr *sattr)
2293 {
2294         struct nfs4_createdata *data;
2295         int status = -ENOMEM;
2296
2297         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2298         if (data == NULL)
2299                 goto out;
2300
2301         status = nfs4_do_create(dir, dentry, data);
2302
2303         nfs4_free_createdata(data);
2304 out:
2305         return status;
2306 }
2307
2308 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2309                 struct iattr *sattr)
2310 {
2311         struct nfs4_exception exception = { };
2312         int err;
2313         do {
2314                 err = nfs4_handle_exception(NFS_SERVER(dir),
2315                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2316                                 &exception);
2317         } while (exception.retry);
2318         return err;
2319 }
2320
2321 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2322                   u64 cookie, struct page *page, unsigned int count, int plus)
2323 {
2324         struct inode            *dir = dentry->d_inode;
2325         struct nfs4_readdir_arg args = {
2326                 .fh = NFS_FH(dir),
2327                 .pages = &page,
2328                 .pgbase = 0,
2329                 .count = count,
2330                 .bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
2331         };
2332         struct nfs4_readdir_res res;
2333         struct rpc_message msg = {
2334                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2335                 .rpc_argp = &args,
2336                 .rpc_resp = &res,
2337                 .rpc_cred = cred,
2338         };
2339         int                     status;
2340
2341         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2342                         dentry->d_parent->d_name.name,
2343                         dentry->d_name.name,
2344                         (unsigned long long)cookie);
2345         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2346         res.pgbase = args.pgbase;
2347         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2348         if (status == 0)
2349                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2350
2351         nfs_invalidate_atime(dir);
2352
2353         dprintk("%s: returns %d\n", __func__, status);
2354         return status;
2355 }
2356
2357 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2358                   u64 cookie, struct page *page, unsigned int count, int plus)
2359 {
2360         struct nfs4_exception exception = { };
2361         int err;
2362         do {
2363                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2364                                 _nfs4_proc_readdir(dentry, cred, cookie,
2365                                         page, count, plus),
2366                                 &exception);
2367         } while (exception.retry);
2368         return err;
2369 }
2370
2371 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2372                 struct iattr *sattr, dev_t rdev)
2373 {
2374         struct nfs4_createdata *data;
2375         int mode = sattr->ia_mode;
2376         int status = -ENOMEM;
2377
2378         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2379         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2380
2381         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2382         if (data == NULL)
2383                 goto out;
2384
2385         if (S_ISFIFO(mode))
2386                 data->arg.ftype = NF4FIFO;
2387         else if (S_ISBLK(mode)) {
2388                 data->arg.ftype = NF4BLK;
2389                 data->arg.u.device.specdata1 = MAJOR(rdev);
2390                 data->arg.u.device.specdata2 = MINOR(rdev);
2391         }
2392         else if (S_ISCHR(mode)) {
2393                 data->arg.ftype = NF4CHR;
2394                 data->arg.u.device.specdata1 = MAJOR(rdev);
2395                 data->arg.u.device.specdata2 = MINOR(rdev);
2396         }
2397
2398         status = nfs4_do_create(dir, dentry, data);
2399
2400         nfs4_free_createdata(data);
2401 out:
2402         return status;
2403 }
2404
2405 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2406                 struct iattr *sattr, dev_t rdev)
2407 {
2408         struct nfs4_exception exception = { };
2409         int err;
2410         do {
2411                 err = nfs4_handle_exception(NFS_SERVER(dir),
2412                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2413                                 &exception);
2414         } while (exception.retry);
2415         return err;
2416 }
2417
2418 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2419                  struct nfs_fsstat *fsstat)
2420 {
2421         struct nfs4_statfs_arg args = {
2422                 .fh = fhandle,
2423                 .bitmask = server->attr_bitmask,
2424         };
2425         struct rpc_message msg = {
2426                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2427                 .rpc_argp = &args,
2428                 .rpc_resp = fsstat,
2429         };
2430
2431         nfs_fattr_init(fsstat->fattr);
2432         return rpc_call_sync(server->client, &msg, 0);
2433 }
2434
2435 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2436 {
2437         struct nfs4_exception exception = { };
2438         int err;
2439         do {
2440                 err = nfs4_handle_exception(server,
2441                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2442                                 &exception);
2443         } while (exception.retry);
2444         return err;
2445 }
2446
2447 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2448                 struct nfs_fsinfo *fsinfo)
2449 {
2450         struct nfs4_fsinfo_arg args = {
2451                 .fh = fhandle,
2452                 .bitmask = server->attr_bitmask,
2453         };
2454         struct rpc_message msg = {
2455                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2456                 .rpc_argp = &args,
2457                 .rpc_resp = fsinfo,
2458         };
2459
2460         return rpc_call_sync(server->client, &msg, 0);
2461 }
2462
2463 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2464 {
2465         struct nfs4_exception exception = { };
2466         int err;
2467
2468         do {
2469                 err = nfs4_handle_exception(server,
2470                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2471                                 &exception);
2472         } while (exception.retry);
2473         return err;
2474 }
2475
2476 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2477 {
2478         nfs_fattr_init(fsinfo->fattr);
2479         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2480 }
2481
2482 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2483                 struct nfs_pathconf *pathconf)
2484 {
2485         struct nfs4_pathconf_arg args = {
2486                 .fh = fhandle,
2487                 .bitmask = server->attr_bitmask,
2488         };
2489         struct rpc_message msg = {
2490                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2491                 .rpc_argp = &args,
2492                 .rpc_resp = pathconf,
2493         };
2494
2495         /* None of the pathconf attributes are mandatory to implement */
2496         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2497                 memset(pathconf, 0, sizeof(*pathconf));
2498                 return 0;
2499         }
2500
2501         nfs_fattr_init(pathconf->fattr);
2502         return rpc_call_sync(server->client, &msg, 0);
2503 }
2504
2505 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2506                 struct nfs_pathconf *pathconf)
2507 {
2508         struct nfs4_exception exception = { };
2509         int err;
2510
2511         do {
2512                 err = nfs4_handle_exception(server,
2513                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2514                                 &exception);
2515         } while (exception.retry);
2516         return err;
2517 }
2518
2519 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2520 {
2521         struct nfs_server *server = NFS_SERVER(data->inode);
2522
2523         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2524                 rpc_restart_call(task);
2525                 return -EAGAIN;
2526         }
2527
2528         nfs_invalidate_atime(data->inode);
2529         if (task->tk_status > 0)
2530                 renew_lease(server, data->timestamp);
2531         return 0;
2532 }
2533
2534 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2535 {
2536         data->timestamp   = jiffies;
2537         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2538 }
2539
2540 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2541 {
2542         struct inode *inode = data->inode;
2543
2544         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2545                 rpc_restart_call(task);
2546                 return -EAGAIN;
2547         }
2548         if (task->tk_status >= 0) {
2549                 renew_lease(NFS_SERVER(inode), data->timestamp);
2550                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2551         }
2552         return 0;
2553 }
2554
2555 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2556 {
2557         struct nfs_server *server = NFS_SERVER(data->inode);
2558
2559         data->args.bitmask = server->cache_consistency_bitmask;
2560         data->res.server = server;
2561         data->timestamp   = jiffies;
2562
2563         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2564 }
2565
2566 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2567 {
2568         struct inode *inode = data->inode;
2569
2570         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2571                 rpc_restart_call(task);
2572                 return -EAGAIN;
2573         }
2574         nfs_refresh_inode(inode, data->res.fattr);
2575         return 0;
2576 }
2577
2578 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2579 {
2580         struct nfs_server *server = NFS_SERVER(data->inode);
2581
2582         data->args.bitmask = server->cache_consistency_bitmask;
2583         data->res.server = server;
2584         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2585 }
2586
2587 /*
2588  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2589  * standalone procedure for queueing an asynchronous RENEW.
2590  */
2591 static void nfs4_renew_done(struct rpc_task *task, void *data)
2592 {
2593         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2594         unsigned long timestamp = (unsigned long)data;
2595
2596         if (task->tk_status < 0) {
2597                 /* Unless we're shutting down, schedule state recovery! */
2598                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
2599                         nfs4_schedule_state_recovery(clp);
2600                 return;
2601         }
2602         spin_lock(&clp->cl_lock);
2603         if (time_before(clp->cl_last_renewal,timestamp))
2604                 clp->cl_last_renewal = timestamp;
2605         spin_unlock(&clp->cl_lock);
2606 }
2607
2608 static const struct rpc_call_ops nfs4_renew_ops = {
2609         .rpc_call_done = nfs4_renew_done,
2610 };
2611
2612 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2613 {
2614         struct rpc_message msg = {
2615                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2616                 .rpc_argp       = clp,
2617                 .rpc_cred       = cred,
2618         };
2619
2620         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2621                         &nfs4_renew_ops, (void *)jiffies);
2622 }
2623
2624 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2625 {
2626         struct rpc_message msg = {
2627                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2628                 .rpc_argp       = clp,
2629                 .rpc_cred       = cred,
2630         };
2631         unsigned long now = jiffies;
2632         int status;
2633
2634         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2635         if (status < 0)
2636                 return status;
2637         spin_lock(&clp->cl_lock);
2638         if (time_before(clp->cl_last_renewal,now))
2639                 clp->cl_last_renewal = now;
2640         spin_unlock(&clp->cl_lock);
2641         return 0;
2642 }
2643
2644 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2645 {
2646         return (server->caps & NFS_CAP_ACLS)
2647                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2648                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2649 }
2650
2651 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2652  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2653  * the stack.
2654  */
2655 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2656
2657 static void buf_to_pages(const void *buf, size_t buflen,
2658                 struct page **pages, unsigned int *pgbase)
2659 {
2660         const void *p = buf;
2661
2662         *pgbase = offset_in_page(buf);
2663         p -= *pgbase;
2664         while (p < buf + buflen) {
2665                 *(pages++) = virt_to_page(p);
2666                 p += PAGE_CACHE_SIZE;
2667         }
2668 }
2669
2670 struct nfs4_cached_acl {
2671         int cached;
2672         size_t len;
2673         char data[0];
2674 };
2675
2676 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2677 {
2678         struct nfs_inode *nfsi = NFS_I(inode);
2679
2680         spin_lock(&inode->i_lock);
2681         kfree(nfsi->nfs4_acl);
2682         nfsi->nfs4_acl = acl;
2683         spin_unlock(&inode->i_lock);
2684 }
2685
2686 static void nfs4_zap_acl_attr(struct inode *inode)
2687 {
2688         nfs4_set_cached_acl(inode, NULL);
2689 }
2690
2691 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2692 {
2693         struct nfs_inode *nfsi = NFS_I(inode);
2694         struct nfs4_cached_acl *acl;
2695         int ret = -ENOENT;
2696
2697         spin_lock(&inode->i_lock);
2698         acl = nfsi->nfs4_acl;
2699         if (acl == NULL)
2700                 goto out;
2701         if (buf == NULL) /* user is just asking for length */
2702                 goto out_len;
2703         if (acl->cached == 0)
2704                 goto out;
2705         ret = -ERANGE; /* see getxattr(2) man page */
2706         if (acl->len > buflen)
2707                 goto out;
2708         memcpy(buf, acl->data, acl->len);
2709 out_len:
2710         ret = acl->len;
2711 out:
2712         spin_unlock(&inode->i_lock);
2713         return ret;
2714 }
2715
2716 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2717 {
2718         struct nfs4_cached_acl *acl;
2719
2720         if (buf && acl_len <= PAGE_SIZE) {
2721                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2722                 if (acl == NULL)
2723                         goto out;
2724                 acl->cached = 1;
2725                 memcpy(acl->data, buf, acl_len);
2726         } else {
2727                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2728                 if (acl == NULL)
2729                         goto out;
2730                 acl->cached = 0;
2731         }
2732         acl->len = acl_len;
2733 out:
2734         nfs4_set_cached_acl(inode, acl);
2735 }
2736
2737 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2738 {
2739         struct page *pages[NFS4ACL_MAXPAGES];
2740         struct nfs_getaclargs args = {
2741                 .fh = NFS_FH(inode),
2742                 .acl_pages = pages,
2743                 .acl_len = buflen,
2744         };
2745         size_t resp_len = buflen;
2746         void *resp_buf;
2747         struct rpc_message msg = {
2748                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2749                 .rpc_argp = &args,
2750                 .rpc_resp = &resp_len,
2751         };
2752         struct page *localpage = NULL;
2753         int ret;
2754
2755         if (buflen < PAGE_SIZE) {
2756                 /* As long as we're doing a round trip to the server anyway,
2757                  * let's be prepared for a page of acl data. */
2758                 localpage = alloc_page(GFP_KERNEL);
2759                 resp_buf = page_address(localpage);
2760                 if (localpage == NULL)
2761                         return -ENOMEM;
2762                 args.acl_pages[0] = localpage;
2763                 args.acl_pgbase = 0;
2764                 resp_len = args.acl_len = PAGE_SIZE;
2765         } else {
2766                 resp_buf = buf;
2767                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2768         }
2769         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2770         if (ret)
2771                 goto out_free;
2772         if (resp_len > args.acl_len)
2773                 nfs4_write_cached_acl(inode, NULL, resp_len);
2774         else
2775                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2776         if (buf) {
2777                 ret = -ERANGE;
2778                 if (resp_len > buflen)
2779                         goto out_free;
2780                 if (localpage)
2781                         memcpy(buf, resp_buf, resp_len);
2782         }
2783         ret = resp_len;
2784 out_free:
2785         if (localpage)
2786                 __free_page(localpage);
2787         return ret;
2788 }
2789
2790 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2791 {
2792         struct nfs4_exception exception = { };
2793         ssize_t ret;
2794         do {
2795                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2796                 if (ret >= 0)
2797                         break;
2798                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2799         } while (exception.retry);
2800         return ret;
2801 }
2802
2803 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2804 {
2805         struct nfs_server *server = NFS_SERVER(inode);
2806         int ret;
2807
2808         if (!nfs4_server_supports_acls(server))
2809                 return -EOPNOTSUPP;
2810         ret = nfs_revalidate_inode(server, inode);
2811         if (ret < 0)
2812                 return ret;
2813         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2814                 nfs_zap_acl_cache(inode);
2815         ret = nfs4_read_cached_acl(inode, buf, buflen);
2816         if (ret != -ENOENT)
2817                 return ret;
2818         return nfs4_get_acl_uncached(inode, buf, buflen);
2819 }
2820
2821 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2822 {
2823         struct nfs_server *server = NFS_SERVER(inode);
2824         struct page *pages[NFS4ACL_MAXPAGES];
2825         struct nfs_setaclargs arg = {
2826                 .fh             = NFS_FH(inode),
2827                 .acl_pages      = pages,
2828                 .acl_len        = buflen,
2829         };
2830         struct rpc_message msg = {
2831                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2832                 .rpc_argp       = &arg,
2833                 .rpc_resp       = NULL,
2834         };
2835         int ret;
2836
2837         if (!nfs4_server_supports_acls(server))
2838                 return -EOPNOTSUPP;
2839         nfs_inode_return_delegation(inode);
2840         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2841         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2842         nfs_access_zap_cache(inode);
2843         nfs_zap_acl_cache(inode);
2844         return ret;
2845 }
2846
2847 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2848 {
2849         struct nfs4_exception exception = { };
2850         int err;
2851         do {
2852                 err = nfs4_handle_exception(NFS_SERVER(inode),
2853                                 __nfs4_proc_set_acl(inode, buf, buflen),
2854                                 &exception);
2855         } while (exception.retry);
2856         return err;
2857 }
2858
2859 static int
2860 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
2861 {
2862         struct nfs_client *clp = server->nfs_client;
2863
2864         if (!clp || task->tk_status >= 0)
2865                 return 0;
2866         switch(task->tk_status) {
2867                 case -NFS4ERR_ADMIN_REVOKED:
2868                 case -NFS4ERR_BAD_STATEID:
2869                 case -NFS4ERR_OPENMODE:
2870                         if (state == NULL)
2871                                 break;
2872                         nfs4_state_mark_reclaim_nograce(clp, state);
2873                 case -NFS4ERR_STALE_CLIENTID:
2874                 case -NFS4ERR_STALE_STATEID:
2875                 case -NFS4ERR_EXPIRED:
2876                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2877                         nfs4_schedule_state_recovery(clp);
2878                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
2879                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2880                         task->tk_status = 0;
2881                         return -EAGAIN;
2882                 case -NFS4ERR_DELAY:
2883                         nfs_inc_server_stats(server, NFSIOS_DELAY);
2884                 case -NFS4ERR_GRACE:
2885                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2886                         task->tk_status = 0;
2887                         return -EAGAIN;
2888                 case -NFS4ERR_OLD_STATEID:
2889                         task->tk_status = 0;
2890                         return -EAGAIN;
2891         }
2892         task->tk_status = nfs4_map_errors(task->tk_status);
2893         return 0;
2894 }
2895
2896 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2897 {
2898         nfs4_verifier sc_verifier;
2899         struct nfs4_setclientid setclientid = {
2900                 .sc_verifier = &sc_verifier,
2901                 .sc_prog = program,
2902         };
2903         struct rpc_message msg = {
2904                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2905                 .rpc_argp = &setclientid,
2906                 .rpc_resp = clp,
2907                 .rpc_cred = cred,
2908         };
2909         __be32 *p;
2910         int loop = 0;
2911         int status;
2912
2913         p = (__be32*)sc_verifier.data;
2914         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2915         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2916
2917         for(;;) {
2918                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2919                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2920                                 clp->cl_ipaddr,
2921                                 rpc_peeraddr2str(clp->cl_rpcclient,
2922                                                         RPC_DISPLAY_ADDR),
2923                                 rpc_peeraddr2str(clp->cl_rpcclient,
2924                                                         RPC_DISPLAY_PROTO),
2925                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
2926                                 clp->cl_id_uniquifier);
2927                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2928                                 sizeof(setclientid.sc_netid),
2929                                 rpc_peeraddr2str(clp->cl_rpcclient,
2930                                                         RPC_DISPLAY_NETID));
2931                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2932                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2933                                 clp->cl_ipaddr, port >> 8, port & 255);
2934
2935                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2936                 if (status != -NFS4ERR_CLID_INUSE)
2937                         break;
2938                 if (signalled())
2939                         break;
2940                 if (loop++ & 1)
2941                         ssleep(clp->cl_lease_time + 1);
2942                 else
2943                         if (++clp->cl_id_uniquifier == 0)
2944                                 break;
2945         }
2946         return status;
2947 }
2948
2949 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2950 {
2951         struct nfs_fsinfo fsinfo;
2952         struct rpc_message msg = {
2953                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2954                 .rpc_argp = clp,
2955                 .rpc_resp = &fsinfo,
2956                 .rpc_cred = cred,
2957         };
2958         unsigned long now;
2959         int status;
2960
2961         now = jiffies;
2962         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2963         if (status == 0) {
2964                 spin_lock(&clp->cl_lock);
2965                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2966                 clp->cl_last_renewal = now;
2967                 spin_unlock(&clp->cl_lock);
2968         }
2969         return status;
2970 }
2971
2972 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2973 {
2974         long timeout = 0;
2975         int err;
2976         do {
2977                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2978                 switch (err) {
2979                         case 0:
2980                                 return err;
2981                         case -NFS4ERR_RESOURCE:
2982                                 /* The IBM lawyers misread another document! */
2983                         case -NFS4ERR_DELAY:
2984                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2985                 }
2986         } while (err == 0);
2987         return err;
2988 }
2989
2990 struct nfs4_delegreturndata {
2991         struct nfs4_delegreturnargs args;
2992         struct nfs4_delegreturnres res;
2993         struct nfs_fh fh;
2994         nfs4_stateid stateid;
2995         unsigned long timestamp;
2996         struct nfs_fattr fattr;
2997         int rpc_status;
2998 };
2999
3000 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3001 {
3002         struct nfs4_delegreturndata *data = calldata;
3003         data->rpc_status = task->tk_status;
3004         if (data->rpc_status == 0)
3005                 renew_lease(data->res.server, data->timestamp);
3006 }
3007
3008 static void nfs4_delegreturn_release(void *calldata)
3009 {
3010         kfree(calldata);
3011 }
3012
3013 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3014         .rpc_call_done = nfs4_delegreturn_done,
3015         .rpc_release = nfs4_delegreturn_release,
3016 };
3017
3018 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3019 {
3020         struct nfs4_delegreturndata *data;
3021         struct nfs_server *server = NFS_SERVER(inode);
3022         struct rpc_task *task;
3023         struct rpc_message msg = {
3024                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3025                 .rpc_cred = cred,
3026         };
3027         struct rpc_task_setup task_setup_data = {
3028                 .rpc_client = server->client,
3029                 .rpc_message = &msg,
3030                 .callback_ops = &nfs4_delegreturn_ops,
3031                 .flags = RPC_TASK_ASYNC,
3032         };
3033         int status = 0;
3034
3035         data = kmalloc(sizeof(*data), GFP_KERNEL);
3036         if (data == NULL)
3037                 return -ENOMEM;
3038         data->args.fhandle = &data->fh;
3039         data->args.stateid = &data->stateid;
3040         data->args.bitmask = server->attr_bitmask;
3041         nfs_copy_fh(&data->fh, NFS_FH(inode));
3042         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3043         data->res.fattr = &data->fattr;
3044         data->res.server = server;
3045         nfs_fattr_init(data->res.fattr);
3046         data->timestamp = jiffies;
3047         data->rpc_status = 0;
3048
3049         task_setup_data.callback_data = data;
3050         msg.rpc_argp = &data->args,
3051         msg.rpc_resp = &data->res,
3052         task = rpc_run_task(&task_setup_data);
3053         if (IS_ERR(task))
3054                 return PTR_ERR(task);
3055         if (!issync)
3056                 goto out;
3057         status = nfs4_wait_for_completion_rpc_task(task);
3058         if (status != 0)
3059                 goto out;
3060         status = data->rpc_status;
3061         if (status != 0)
3062                 goto out;
3063         nfs_refresh_inode(inode, &data->fattr);
3064 out:
3065         rpc_put_task(task);
3066         return status;
3067 }
3068
3069 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3070 {
3071         struct nfs_server *server = NFS_SERVER(inode);
3072         struct nfs4_exception exception = { };
3073         int err;
3074         do {
3075                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3076                 switch (err) {
3077                         case -NFS4ERR_STALE_STATEID:
3078                         case -NFS4ERR_EXPIRED:
3079                         case 0:
3080                                 return 0;
3081                 }
3082                 err = nfs4_handle_exception(server, err, &exception);
3083         } while (exception.retry);
3084         return err;
3085 }
3086
3087 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3088 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3089
3090 /*
3091  * sleep, with exponential backoff, and retry the LOCK operation.
3092  */
3093 static unsigned long
3094 nfs4_set_lock_task_retry(unsigned long timeout)
3095 {
3096         schedule_timeout_killable(timeout);
3097         timeout <<= 1;
3098         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3099                 return NFS4_LOCK_MAXTIMEOUT;
3100         return timeout;
3101 }
3102
3103 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3104 {
3105         struct inode *inode = state->inode;
3106         struct nfs_server *server = NFS_SERVER(inode);
3107         struct nfs_client *clp = server->nfs_client;
3108         struct nfs_lockt_args arg = {
3109                 .fh = NFS_FH(inode),
3110                 .fl = request,
3111         };
3112         struct nfs_lockt_res res = {
3113                 .denied = request,
3114         };
3115         struct rpc_message msg = {
3116                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3117                 .rpc_argp       = &arg,
3118                 .rpc_resp       = &res,
3119                 .rpc_cred       = state->owner->so_cred,
3120         };
3121         struct nfs4_lock_state *lsp;
3122         int status;
3123
3124         arg.lock_owner.clientid = clp->cl_clientid;
3125         status = nfs4_set_lock_state(state, request);
3126         if (status != 0)
3127                 goto out;
3128         lsp = request->fl_u.nfs4_fl.owner;
3129         arg.lock_owner.id = lsp->ls_id.id;
3130         status = rpc_call_sync(server->client, &msg, 0);
3131         switch (status) {
3132                 case 0:
3133                         request->fl_type = F_UNLCK;
3134                         break;
3135                 case -NFS4ERR_DENIED:
3136                         status = 0;
3137         }
3138         request->fl_ops->fl_release_private(request);
3139 out:
3140         return status;
3141 }
3142
3143 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3144 {
3145         struct nfs4_exception exception = { };
3146         int err;
3147
3148         do {
3149                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3150                                 _nfs4_proc_getlk(state, cmd, request),
3151                                 &exception);
3152         } while (exception.retry);
3153         return err;
3154 }
3155
3156 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3157 {
3158         int res = 0;
3159         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3160                 case FL_POSIX:
3161                         res = posix_lock_file_wait(file, fl);
3162                         break;
3163                 case FL_FLOCK:
3164                         res = flock_lock_file_wait(file, fl);
3165                         break;
3166                 default:
3167                         BUG();
3168         }
3169         return res;
3170 }
3171
3172 struct nfs4_unlockdata {
3173         struct nfs_locku_args arg;
3174         struct nfs_locku_res res;
3175         struct nfs4_lock_state *lsp;
3176         struct nfs_open_context *ctx;
3177         struct file_lock fl;
3178         const struct nfs_server *server;
3179         unsigned long timestamp;
3180 };
3181
3182 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3183                 struct nfs_open_context *ctx,
3184                 struct nfs4_lock_state *lsp,
3185                 struct nfs_seqid *seqid)
3186 {
3187         struct nfs4_unlockdata *p;
3188         struct inode *inode = lsp->ls_state->inode;
3189
3190         p = kmalloc(sizeof(*p), GFP_KERNEL);
3191         if (p == NULL)
3192                 return NULL;
3193         p->arg.fh = NFS_FH(inode);
3194         p->arg.fl = &p->fl;
3195         p->arg.seqid = seqid;
3196         p->res.seqid = seqid;
3197         p->arg.stateid = &lsp->ls_stateid;
3198         p->lsp = lsp;
3199         atomic_inc(&lsp->ls_count);
3200         /* Ensure we don't close file until we're done freeing locks! */
3201         p->ctx = get_nfs_open_context(ctx);
3202         memcpy(&p->fl, fl, sizeof(p->fl));
3203         p->server = NFS_SERVER(inode);
3204         return p;
3205 }
3206
3207 static void nfs4_locku_release_calldata(void *data)
3208 {
3209         struct nfs4_unlockdata *calldata = data;
3210         nfs_free_seqid(calldata->arg.seqid);
3211         nfs4_put_lock_state(calldata->lsp);
3212         put_nfs_open_context(calldata->ctx);
3213         kfree(calldata);
3214 }
3215
3216 static void nfs4_locku_done(struct rpc_task *task, void *data)
3217 {
3218         struct nfs4_unlockdata *calldata = data;
3219
3220         if (RPC_ASSASSINATED(task))
3221                 return;
3222         switch (task->tk_status) {
3223                 case 0:
3224                         memcpy(calldata->lsp->ls_stateid.data,
3225                                         calldata->res.stateid.data,
3226                                         sizeof(calldata->lsp->ls_stateid.data));
3227                         renew_lease(calldata->server, calldata->timestamp);
3228                         break;
3229                 case -NFS4ERR_BAD_STATEID:
3230                 case -NFS4ERR_OLD_STATEID:
3231                 case -NFS4ERR_STALE_STATEID:
3232                 case -NFS4ERR_EXPIRED:
3233                         break;
3234                 default:
3235                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3236                                 rpc_restart_call(task);
3237         }
3238 }
3239
3240 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3241 {
3242         struct nfs4_unlockdata *calldata = data;
3243
3244         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3245                 return;
3246         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3247                 /* Note: exit _without_ running nfs4_locku_done */
3248                 task->tk_action = NULL;
3249                 return;
3250         }
3251         calldata->timestamp = jiffies;
3252         rpc_call_start(task);
3253 }
3254
3255 static const struct rpc_call_ops nfs4_locku_ops = {
3256         .rpc_call_prepare = nfs4_locku_prepare,
3257         .rpc_call_done = nfs4_locku_done,
3258         .rpc_release = nfs4_locku_release_calldata,
3259 };
3260
3261 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3262                 struct nfs_open_context *ctx,
3263                 struct nfs4_lock_state *lsp,
3264                 struct nfs_seqid *seqid)
3265 {
3266         struct nfs4_unlockdata *data;
3267         struct rpc_message msg = {
3268                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3269                 .rpc_cred = ctx->cred,
3270         };
3271         struct rpc_task_setup task_setup_data = {
3272                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3273                 .rpc_message = &msg,
3274                 .callback_ops = &nfs4_locku_ops,
3275                 .workqueue = nfsiod_workqueue,
3276                 .flags = RPC_TASK_ASYNC,
3277         };
3278
3279         /* Ensure this is an unlock - when canceling a lock, the
3280          * canceled lock is passed in, and it won't be an unlock.
3281          */
3282         fl->fl_type = F_UNLCK;
3283
3284         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3285         if (data == NULL) {
3286                 nfs_free_seqid(seqid);
3287                 return ERR_PTR(-ENOMEM);
3288         }
3289
3290         msg.rpc_argp = &data->arg,
3291         msg.rpc_resp = &data->res,
3292         task_setup_data.callback_data = data;
3293         return rpc_run_task(&task_setup_data);
3294 }
3295
3296 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3297 {
3298         struct nfs_inode *nfsi = NFS_I(state->inode);
3299         struct nfs_seqid *seqid;
3300         struct nfs4_lock_state *lsp;
3301         struct rpc_task *task;
3302         int status = 0;
3303         unsigned char fl_flags = request->fl_flags;
3304
3305         status = nfs4_set_lock_state(state, request);
3306         /* Unlock _before_ we do the RPC call */
3307         request->fl_flags |= FL_EXISTS;
3308         down_read(&nfsi->rwsem);
3309         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3310                 up_read(&nfsi->rwsem);
3311                 goto out;
3312         }
3313         up_read(&nfsi->rwsem);
3314         if (status != 0)
3315                 goto out;
3316         /* Is this a delegated lock? */
3317         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3318                 goto out;
3319         lsp = request->fl_u.nfs4_fl.owner;
3320         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3321         status = -ENOMEM;
3322         if (seqid == NULL)
3323                 goto out;
3324         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3325         status = PTR_ERR(task);
3326         if (IS_ERR(task))
3327                 goto out;
3328         status = nfs4_wait_for_completion_rpc_task(task);
3329         rpc_put_task(task);
3330 out:
3331         request->fl_flags = fl_flags;
3332         return status;
3333 }
3334
3335 struct nfs4_lockdata {
3336         struct nfs_lock_args arg;
3337         struct nfs_lock_res res;
3338         struct nfs4_lock_state *lsp;
3339         struct nfs_open_context *ctx;
3340         struct file_lock fl;
3341         unsigned long timestamp;
3342         int rpc_status;
3343         int cancelled;
3344 };
3345
3346 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3347                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3348 {
3349         struct nfs4_lockdata *p;
3350         struct inode *inode = lsp->ls_state->inode;
3351         struct nfs_server *server = NFS_SERVER(inode);
3352
3353         p = kzalloc(sizeof(*p), GFP_KERNEL);
3354         if (p == NULL)
3355                 return NULL;
3356
3357         p->arg.fh = NFS_FH(inode);
3358         p->arg.fl = &p->fl;
3359         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3360         if (p->arg.open_seqid == NULL)
3361                 goto out_free;
3362         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3363         if (p->arg.lock_seqid == NULL)
3364                 goto out_free_seqid;
3365         p->arg.lock_stateid = &lsp->ls_stateid;
3366         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3367         p->arg.lock_owner.id = lsp->ls_id.id;
3368         p->res.lock_seqid = p->arg.lock_seqid;
3369         p->lsp = lsp;
3370         atomic_inc(&lsp->ls_count);
3371         p->ctx = get_nfs_open_context(ctx);
3372         memcpy(&p->fl, fl, sizeof(p->fl));
3373         return p;
3374 out_free_seqid:
3375         nfs_free_seqid(p->arg.open_seqid);
3376 out_free:
3377         kfree(p);
3378         return NULL;
3379 }
3380
3381 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3382 {
3383         struct nfs4_lockdata *data = calldata;
3384         struct nfs4_state *state = data->lsp->ls_state;
3385
3386         dprintk("%s: begin!\n", __func__);
3387         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3388                 return;
3389         /* Do we need to do an open_to_lock_owner? */
3390         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3391                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3392                         return;
3393                 data->arg.open_stateid = &state->stateid;
3394                 data->arg.new_lock_owner = 1;
3395                 data->res.open_seqid = data->arg.open_seqid;
3396         } else
3397                 data->arg.new_lock_owner = 0;
3398         data->timestamp = jiffies;
3399         rpc_call_start(task);
3400         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3401 }
3402
3403 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3404 {
3405         struct nfs4_lockdata *data = calldata;
3406
3407         dprintk("%s: begin!\n", __func__);
3408
3409         data->rpc_status = task->tk_status;
3410         if (RPC_ASSASSINATED(task))
3411                 goto out;
3412         if (data->arg.new_lock_owner != 0) {
3413                 if (data->rpc_status == 0)
3414                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3415                 else
3416                         goto out;
3417         }
3418         if (data->rpc_status == 0) {
3419                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3420                                         sizeof(data->lsp->ls_stateid.data));
3421                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3422                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3423         }
3424 out:
3425         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3426 }
3427
3428 static void nfs4_lock_release(void *calldata)
3429 {
3430         struct nfs4_lockdata *data = calldata;
3431
3432         dprintk("%s: begin!\n", __func__);
3433         nfs_free_seqid(data->arg.open_seqid);
3434         if (data->cancelled != 0) {
3435                 struct rpc_task *task;
3436                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3437                                 data->arg.lock_seqid);
3438                 if (!IS_ERR(task))
3439                         rpc_put_task(task);
3440                 dprintk("%s: cancelling lock!\n", __func__);
3441         } else
3442                 nfs_free_seqid(data->arg.lock_seqid);
3443         nfs4_put_lock_state(data->lsp);
3444         put_nfs_open_context(data->ctx);
3445         kfree(data);
3446         dprintk("%s: done!\n", __func__);
3447 }
3448
3449 static const struct rpc_call_ops nfs4_lock_ops = {
3450         .rpc_call_prepare = nfs4_lock_prepare,
3451         .rpc_call_done = nfs4_lock_done,
3452         .rpc_release = nfs4_lock_release,
3453 };
3454
3455 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3456 {
3457         struct nfs4_lockdata *data;
3458         struct rpc_task *task;
3459         struct rpc_message msg = {
3460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3461                 .rpc_cred = state->owner->so_cred,
3462         };
3463         struct rpc_task_setup task_setup_data = {
3464                 .rpc_client = NFS_CLIENT(state->inode),
3465                 .rpc_message = &msg,
3466                 .callback_ops = &nfs4_lock_ops,
3467                 .workqueue = nfsiod_workqueue,
3468                 .flags = RPC_TASK_ASYNC,
3469         };
3470         int ret;
3471
3472         dprintk("%s: begin!\n", __func__);
3473         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3474                         fl->fl_u.nfs4_fl.owner);
3475         if (data == NULL)
3476                 return -ENOMEM;
3477         if (IS_SETLKW(cmd))
3478                 data->arg.block = 1;
3479         if (reclaim != 0)
3480                 data->arg.reclaim = 1;
3481         msg.rpc_argp = &data->arg,
3482         msg.rpc_resp = &data->res,
3483         task_setup_data.callback_data = data;
3484         task = rpc_run_task(&task_setup_data);
3485         if (IS_ERR(task))
3486                 return PTR_ERR(task);
3487         ret = nfs4_wait_for_completion_rpc_task(task);
3488         if (ret == 0) {
3489                 ret = data->rpc_status;
3490                 if (ret == -NFS4ERR_DENIED)
3491                         ret = -EAGAIN;
3492         } else
3493                 data->cancelled = 1;
3494         rpc_put_task(task);
3495         dprintk("%s: done, ret = %d!\n", __func__, ret);
3496         return ret;
3497 }
3498
3499 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3500 {
3501         struct nfs_server *server = NFS_SERVER(state->inode);
3502         struct nfs4_exception exception = { };
3503         int err;
3504
3505         do {
3506                 /* Cache the lock if possible... */
3507                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3508                         return 0;
3509                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3510                 if (err != -NFS4ERR_DELAY)
3511                         break;
3512                 nfs4_handle_exception(server, err, &exception);
3513         } while (exception.retry);
3514         return err;
3515 }
3516
3517 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3518 {
3519         struct nfs_server *server = NFS_SERVER(state->inode);
3520         struct nfs4_exception exception = { };
3521         int err;
3522
3523         err = nfs4_set_lock_state(state, request);
3524         if (err != 0)
3525                 return err;
3526         do {
3527                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3528                         return 0;
3529                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3530                 if (err != -NFS4ERR_DELAY)
3531                         break;
3532                 nfs4_handle_exception(server, err, &exception);
3533         } while (exception.retry);
3534         return err;
3535 }
3536
3537 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3538 {
3539         struct nfs_inode *nfsi = NFS_I(state->inode);
3540         unsigned char fl_flags = request->fl_flags;
3541         int status;
3542
3543         /* Is this a delegated open? */
3544         status = nfs4_set_lock_state(state, request);
3545         if (status != 0)
3546                 goto out;
3547         request->fl_flags |= FL_ACCESS;
3548         status = do_vfs_lock(request->fl_file, request);
3549         if (status < 0)
3550                 goto out;
3551         down_read(&nfsi->rwsem);
3552         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3553                 /* Yes: cache locks! */
3554                 /* ...but avoid races with delegation recall... */
3555                 request->fl_flags = fl_flags & ~FL_SLEEP;
3556                 status = do_vfs_lock(request->fl_file, request);
3557                 goto out_unlock;
3558         }
3559         status = _nfs4_do_setlk(state, cmd, request, 0);
3560         if (status != 0)
3561                 goto out_unlock;
3562         /* Note: we always want to sleep here! */
3563         request->fl_flags = fl_flags | FL_SLEEP;
3564         if (do_vfs_lock(request->fl_file, request) < 0)
3565                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3566 out_unlock:
3567         up_read(&nfsi->rwsem);
3568 out:
3569         request->fl_flags = fl_flags;
3570         return status;
3571 }
3572
3573 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3574 {
3575         struct nfs4_exception exception = { };
3576         int err;
3577
3578         do {
3579                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3580                                 _nfs4_proc_setlk(state, cmd, request),
3581                                 &exception);
3582         } while (exception.retry);
3583         return err;
3584 }
3585
3586 static int
3587 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3588 {
3589         struct nfs_open_context *ctx;
3590         struct nfs4_state *state;
3591         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3592         int status;
3593
3594         /* verify open state */
3595         ctx = nfs_file_open_context(filp);
3596         state = ctx->state;
3597
3598         if (request->fl_start < 0 || request->fl_end < 0)
3599                 return -EINVAL;
3600
3601         if (IS_GETLK(cmd))
3602                 return nfs4_proc_getlk(state, F_GETLK, request);
3603
3604         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3605                 return -EINVAL;
3606
3607         if (request->fl_type == F_UNLCK)
3608                 return nfs4_proc_unlck(state, cmd, request);
3609
3610         do {
3611                 status = nfs4_proc_setlk(state, cmd, request);
3612                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3613                         break;
3614                 timeout = nfs4_set_lock_task_retry(timeout);
3615                 status = -ERESTARTSYS;
3616                 if (signalled())
3617                         break;
3618         } while(status < 0);
3619         return status;
3620 }
3621
3622 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3623 {
3624         struct nfs_server *server = NFS_SERVER(state->inode);
3625         struct nfs4_exception exception = { };
3626         int err;
3627
3628         err = nfs4_set_lock_state(state, fl);
3629         if (err != 0)
3630                 goto out;
3631         do {
3632                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3633                 if (err != -NFS4ERR_DELAY)
3634                         break;
3635                 err = nfs4_handle_exception(server, err, &exception);
3636         } while (exception.retry);
3637 out:
3638         return err;
3639 }
3640
3641 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3642
3643 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3644                 size_t buflen, int flags)
3645 {
3646         struct inode *inode = dentry->d_inode;
3647
3648         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3649                 return -EOPNOTSUPP;
3650
3651         return nfs4_proc_set_acl(inode, buf, buflen);
3652 }
3653
3654 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3655  * and that's what we'll do for e.g. user attributes that haven't been set.
3656  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3657  * attributes in kernel-managed attribute namespaces. */
3658 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3659                 size_t buflen)
3660 {
3661         struct inode *inode = dentry->d_inode;
3662
3663         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3664                 return -EOPNOTSUPP;
3665
3666         return nfs4_proc_get_acl(inode, buf, buflen);
3667 }
3668
3669 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3670 {
3671         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3672
3673         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3674                 return 0;
3675         if (buf && buflen < len)
3676                 return -ERANGE;
3677         if (buf)
3678                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3679         return len;
3680 }
3681
3682 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
3683 {
3684         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
3685                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
3686                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
3687                 return;
3688
3689         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3690                 NFS_ATTR_FATTR_NLINK;
3691         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3692         fattr->nlink = 2;
3693 }
3694
3695 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3696                 struct nfs4_fs_locations *fs_locations, struct page *page)
3697 {
3698         struct nfs_server *server = NFS_SERVER(dir);
3699         u32 bitmask[2] = {
3700                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3701                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3702         };
3703         struct nfs4_fs_locations_arg args = {
3704                 .dir_fh = NFS_FH(dir),
3705                 .name = name,
3706                 .page = page,
3707                 .bitmask = bitmask,
3708         };
3709         struct rpc_message msg = {
3710                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3711                 .rpc_argp = &args,
3712                 .rpc_resp = fs_locations,
3713         };
3714         int status;
3715
3716         dprintk("%s: start\n", __func__);
3717         nfs_fattr_init(&fs_locations->fattr);
3718         fs_locations->server = server;
3719         fs_locations->nlocations = 0;
3720         status = rpc_call_sync(server->client, &msg, 0);
3721         nfs_fixup_referral_attributes(&fs_locations->fattr);
3722         dprintk("%s: returned status = %d\n", __func__, status);
3723         return status;
3724 }
3725
3726 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3727         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
3728         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
3729         .recover_open   = nfs4_open_reclaim,
3730         .recover_lock   = nfs4_lock_reclaim,
3731 };
3732
3733 struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
3734         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
3735         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
3736         .recover_open   = nfs4_open_expired,
3737         .recover_lock   = nfs4_lock_expired,
3738 };
3739
3740 static const struct inode_operations nfs4_file_inode_operations = {
3741         .permission     = nfs_permission,
3742         .getattr        = nfs_getattr,
3743         .setattr        = nfs_setattr,
3744         .getxattr       = nfs4_getxattr,
3745         .setxattr       = nfs4_setxattr,
3746         .listxattr      = nfs4_listxattr,
3747 };
3748
3749 const struct nfs_rpc_ops nfs_v4_clientops = {
3750         .version        = 4,                    /* protocol version */
3751         .dentry_ops     = &nfs4_dentry_operations,
3752         .dir_inode_ops  = &nfs4_dir_inode_operations,
3753         .file_inode_ops = &nfs4_file_inode_operations,
3754         .getroot        = nfs4_proc_get_root,
3755         .getattr        = nfs4_proc_getattr,
3756         .setattr        = nfs4_proc_setattr,
3757         .lookupfh       = nfs4_proc_lookupfh,
3758         .lookup         = nfs4_proc_lookup,
3759         .access         = nfs4_proc_access,
3760         .readlink       = nfs4_proc_readlink,
3761         .create         = nfs4_proc_create,
3762         .remove         = nfs4_proc_remove,
3763         .unlink_setup   = nfs4_proc_unlink_setup,
3764         .unlink_done    = nfs4_proc_unlink_done,
3765         .rename         = nfs4_proc_rename,
3766         .link           = nfs4_proc_link,
3767         .symlink        = nfs4_proc_symlink,
3768         .mkdir          = nfs4_proc_mkdir,
3769         .rmdir          = nfs4_proc_remove,
3770         .readdir        = nfs4_proc_readdir,
3771         .mknod          = nfs4_proc_mknod,
3772         .statfs         = nfs4_proc_statfs,
3773         .fsinfo         = nfs4_proc_fsinfo,
3774         .pathconf       = nfs4_proc_pathconf,
3775         .set_capabilities = nfs4_server_capabilities,
3776         .decode_dirent  = nfs4_decode_dirent,
3777         .read_setup     = nfs4_proc_read_setup,
3778         .read_done      = nfs4_read_done,
3779         .write_setup    = nfs4_proc_write_setup,
3780         .write_done     = nfs4_write_done,
3781         .commit_setup   = nfs4_proc_commit_setup,
3782         .commit_done    = nfs4_commit_done,
3783         .lock           = nfs4_proc_lock,
3784         .clear_acl_cache = nfs4_zap_acl_attr,
3785         .close_context  = nfs4_close_context,
3786 };
3787
3788 /*
3789  * Local variables:
3790  *  c-basic-offset: 8
3791  * End:
3792  */