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   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 "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags);
  69
  70 /* Prevent leaks of NFSv4 errors into userland */
  71 int nfs4_map_errors(int err)
  72 {
  73         if (err < -1000) {
  74                 dprintk("%s could not handle NFSv4 error %d\n",
  75                                 __FUNCTION__, -err);
  76                 return -EIO;
  77         }
  78         return err;
  79 }
  80
  81 /*
  82  * This is our standard bitmap for GETATTR requests.
  83  */
  84 const u32 nfs4_fattr_bitmap[2] = {
  85         FATTR4_WORD0_TYPE
  86         | FATTR4_WORD0_CHANGE
  87         | FATTR4_WORD0_SIZE
  88         | FATTR4_WORD0_FSID
  89         | FATTR4_WORD0_FILEID,
  90         FATTR4_WORD1_MODE
  91         | FATTR4_WORD1_NUMLINKS
  92         | FATTR4_WORD1_OWNER
  93         | FATTR4_WORD1_OWNER_GROUP
  94         | FATTR4_WORD1_RAWDEV
  95         | FATTR4_WORD1_SPACE_USED
  96         | FATTR4_WORD1_TIME_ACCESS
  97         | FATTR4_WORD1_TIME_METADATA
  98         | FATTR4_WORD1_TIME_MODIFY
  99 };
 100
 101 const u32 nfs4_statfs_bitmap[2] = {
 102         FATTR4_WORD0_FILES_AVAIL
 103         | FATTR4_WORD0_FILES_FREE
 104         | FATTR4_WORD0_FILES_TOTAL,
 105         FATTR4_WORD1_SPACE_AVAIL
 106         | FATTR4_WORD1_SPACE_FREE
 107         | FATTR4_WORD1_SPACE_TOTAL
 108 };
 109
 110 const u32 nfs4_pathconf_bitmap[2] = {
 111         FATTR4_WORD0_MAXLINK
 112         | FATTR4_WORD0_MAXNAME,
 113         0
 114 };
 115
 116 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 117                         | FATTR4_WORD0_MAXREAD
 118                         | FATTR4_WORD0_MAXWRITE
 119                         | FATTR4_WORD0_LEASE_TIME,
 120                         0
 121 };
 122
 123 const u32 nfs4_fs_locations_bitmap[2] = {
 124         FATTR4_WORD0_TYPE
 125         | FATTR4_WORD0_CHANGE
 126         | FATTR4_WORD0_SIZE
 127         | FATTR4_WORD0_FSID
 128         | FATTR4_WORD0_FILEID
 129         | FATTR4_WORD0_FS_LOCATIONS,
 130         FATTR4_WORD1_MODE
 131         | FATTR4_WORD1_NUMLINKS
 132         | FATTR4_WORD1_OWNER
 133         | FATTR4_WORD1_OWNER_GROUP
 134         | FATTR4_WORD1_RAWDEV
 135         | FATTR4_WORD1_SPACE_USED
 136         | FATTR4_WORD1_TIME_ACCESS
 137         | FATTR4_WORD1_TIME_METADATA
 138         | FATTR4_WORD1_TIME_MODIFY
 139         | FATTR4_WORD1_MOUNTED_ON_FILEID
 140 };
 141
 142 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 143                 struct nfs4_readdir_arg *readdir)
 144 {
 145         __be32 *start, *p;
 146
 147         BUG_ON(readdir->count < 80);
 148         if (cookie > 2) {
 149                 readdir->cookie = cookie;
 150                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 151                 return;
 152         }
 153
 154         readdir->cookie = 0;
 155         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 156         if (cookie == 2)
 157                 return;
 158
 159         /*
 160          * NFSv4 servers do not return entries for '.' and '..'
 161          * Therefore, we fake these entries here.  We let '.'
 162          * have cookie 0 and '..' have cookie 1.  Note that
 163          * when talking to the server, we always send cookie 0
 164          * instead of 1 or 2.
 165          */
 166         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 167
 168         if (cookie == 0) {
 169                 *p++ = xdr_one;                                  /* next */
 170                 *p++ = xdr_zero;                   /* cookie, first word */
 171                 *p++ = xdr_one;                   /* cookie, second word */
 172                 *p++ = xdr_one;                             /* entry len */
 173                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 174                 p++;
 175                 *p++ = xdr_one;                         /* bitmap length */
 176                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 177                 *p++ = htonl(8);              /* attribute buffer length */
 178                 p = xdr_encode_hyper(p, dentry->d_inode->i_ino);
 179         }
 180
 181         *p++ = xdr_one;                                  /* next */
 182         *p++ = xdr_zero;                   /* cookie, first word */
 183         *p++ = xdr_two;                   /* cookie, second word */
 184         *p++ = xdr_two;                             /* entry len */
 185         memcpy(p, "..\0\0", 4);                         /* entry */
 186         p++;
 187         *p++ = xdr_one;                         /* bitmap length */
 188         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189         *p++ = htonl(8);              /* attribute buffer length */
 190         p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino);
 191
 192         readdir->pgbase = (char *)p - (char *)start;
 193         readdir->count -= readdir->pgbase;
 194         kunmap_atomic(start, KM_USER0);
 195 }
 196
 197 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 198 {
 199         struct nfs_client *clp = server->nfs_client;
 200         spin_lock(&clp->cl_lock);
 201         if (time_before(clp->cl_last_renewal,timestamp))
 202                 clp->cl_last_renewal = timestamp;
 203         spin_unlock(&clp->cl_lock);
 204 }
 205
 206 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 207 {
 208         struct nfs_inode *nfsi = NFS_I(dir);
 209
 210         spin_lock(&dir->i_lock);
 211         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 212         if (cinfo->before == nfsi->change_attr && cinfo->atomic)
 213                 nfsi->change_attr = cinfo->after;
 214         spin_unlock(&dir->i_lock);
 215 }
 216
 217 struct nfs4_opendata {
 218         struct kref kref;
 219         struct nfs_openargs o_arg;
 220         struct nfs_openres o_res;
 221         struct nfs_open_confirmargs c_arg;
 222         struct nfs_open_confirmres c_res;
 223         struct nfs_fattr f_attr;
 224         struct nfs_fattr dir_attr;
 225         struct path path;
 226         struct dentry *dir;
 227         struct nfs4_state_owner *owner;
 228         struct nfs4_state *state;
 229         struct iattr attrs;
 230         unsigned long timestamp;
 231         unsigned int rpc_done : 1;
 232         int rpc_status;
 233         int cancelled;
 234 };
 235
 236
 237 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 238 {
 239         p->o_res.f_attr = &p->f_attr;
 240         p->o_res.dir_attr = &p->dir_attr;
 241         p->o_res.server = p->o_arg.server;
 242         nfs_fattr_init(&p->f_attr);
 243         nfs_fattr_init(&p->dir_attr);
 244 }
 245
 246 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 247                 struct nfs4_state_owner *sp, int flags,
 248                 const struct iattr *attrs)
 249 {
 250         struct dentry *parent = dget_parent(path->dentry);
 251         struct inode *dir = parent->d_inode;
 252         struct nfs_server *server = NFS_SERVER(dir);
 253         struct nfs4_opendata *p;
 254
 255         p = kzalloc(sizeof(*p), GFP_KERNEL);
 256         if (p == NULL)
 257                 goto err;
 258         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 259         if (p->o_arg.seqid == NULL)
 260                 goto err_free;
 261         p->path.mnt = mntget(path->mnt);
 262         p->path.dentry = dget(path->dentry);
 263         p->dir = parent;
 264         p->owner = sp;
 265         atomic_inc(&sp->so_count);
 266         p->o_arg.fh = NFS_FH(dir);
 267         p->o_arg.open_flags = flags,
 268         p->o_arg.clientid = server->nfs_client->cl_clientid;
 269         p->o_arg.id = sp->so_owner_id.id;
 270         p->o_arg.name = &p->path.dentry->d_name;
 271         p->o_arg.server = server;
 272         p->o_arg.bitmask = server->attr_bitmask;
 273         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 274         if (flags & O_EXCL) {
 275                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 276                 s[0] = jiffies;
 277                 s[1] = current->pid;
 278         } else if (flags & O_CREAT) {
 279                 p->o_arg.u.attrs = &p->attrs;
 280                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 281         }
 282         p->c_arg.fh = &p->o_res.fh;
 283         p->c_arg.stateid = &p->o_res.stateid;
 284         p->c_arg.seqid = p->o_arg.seqid;
 285         nfs4_init_opendata_res(p);
 286         kref_init(&p->kref);
 287         return p;
 288 err_free:
 289         kfree(p);
 290 err:
 291         dput(parent);
 292         return NULL;
 293 }
 294
 295 static void nfs4_opendata_free(struct kref *kref)
 296 {
 297         struct nfs4_opendata *p = container_of(kref,
 298                         struct nfs4_opendata, kref);
 299
 300         nfs_free_seqid(p->o_arg.seqid);
 301         if (p->state != NULL)
 302                 nfs4_put_open_state(p->state);
 303         nfs4_put_state_owner(p->owner);
 304         dput(p->dir);
 305         dput(p->path.dentry);
 306         mntput(p->path.mnt);
 307         kfree(p);
 308 }
 309
 310 static void nfs4_opendata_put(struct nfs4_opendata *p)
 311 {
 312         if (p != NULL)
 313                 kref_put(&p->kref, nfs4_opendata_free);
 314 }
 315
 316 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 317 {
 318         sigset_t oldset;
 319         int ret;
 320
 321         rpc_clnt_sigmask(task->tk_client, &oldset);
 322         ret = rpc_wait_for_completion_task(task);
 323         rpc_clnt_sigunmask(task->tk_client, &oldset);
 324         return ret;
 325 }
 326
 327 static int can_open_cached(struct nfs4_state *state, int mode)
 328 {
 329         int ret = 0;
 330         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 331                 case FMODE_READ:
 332                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 333                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 334                         break;
 335                 case FMODE_WRITE:
 336                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 337                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 338                         break;
 339                 case FMODE_READ|FMODE_WRITE:
 340                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 341         }
 342         return ret;
 343 }
 344
 345 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 346 {
 347         if ((delegation->type & open_flags) != open_flags)
 348                 return 0;
 349         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 350                 return 0;
 351         return 1;
 352 }
 353
 354 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 355 {
 356         switch (open_flags) {
 357                 case FMODE_WRITE:
 358                         state->n_wronly++;
 359                         break;
 360                 case FMODE_READ:
 361                         state->n_rdonly++;
 362                         break;
 363                 case FMODE_READ|FMODE_WRITE:
 364                         state->n_rdwr++;
 365         }
 366         nfs4_state_set_mode_locked(state, state->state | open_flags);
 367 }
 368
 369 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 370 {
 371         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 372                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 373         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 374         switch (open_flags) {
 375                 case FMODE_READ:
 376                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 377                         break;
 378                 case FMODE_WRITE:
 379                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 380                         break;
 381                 case FMODE_READ|FMODE_WRITE:
 382                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 383         }
 384 }
 385
 386 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 387 {
 388         spin_lock(&state->owner->so_lock);
 389         spin_lock(&state->inode->i_lock);
 390         nfs_set_open_stateid_locked(state, stateid, open_flags);
 391         spin_unlock(&state->inode->i_lock);
 392         spin_unlock(&state->owner->so_lock);
 393 }
 394
 395 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 396 {
 397         struct inode *inode = state->inode;
 398
 399         open_flags &= (FMODE_READ|FMODE_WRITE);
 400         /* Protect against nfs4_find_state_byowner() */
 401         spin_lock(&state->owner->so_lock);
 402         spin_lock(&inode->i_lock);
 403         if (deleg_stateid != NULL) {
 404                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 405                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 406         }
 407         if (open_stateid != NULL)
 408                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 409         update_open_stateflags(state, open_flags);
 410         spin_unlock(&inode->i_lock);
 411         spin_unlock(&state->owner->so_lock);
 412 }
 413
 414 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 415 {
 416         struct nfs_delegation *delegation;
 417
 418         rcu_read_lock();
 419         delegation = rcu_dereference(NFS_I(inode)->delegation);
 420         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 421                 rcu_read_unlock();
 422                 return;
 423         }
 424         rcu_read_unlock();
 425         nfs_inode_return_delegation(inode);
 426 }
 427
 428 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 429 {
 430         struct nfs4_state *state = opendata->state;
 431         struct nfs_inode *nfsi = NFS_I(state->inode);
 432         struct nfs_delegation *delegation;
 433         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 434         nfs4_stateid stateid;
 435         int ret = -EAGAIN;
 436
 437         rcu_read_lock();
 438         delegation = rcu_dereference(nfsi->delegation);
 439         for (;;) {
 440                 if (can_open_cached(state, open_mode)) {
 441                         spin_lock(&state->owner->so_lock);
 442                         if (can_open_cached(state, open_mode)) {
 443                                 update_open_stateflags(state, open_mode);
 444                                 spin_unlock(&state->owner->so_lock);
 445                                 rcu_read_unlock();
 446                                 goto out_return_state;
 447                         }
 448                         spin_unlock(&state->owner->so_lock);
 449                 }
 450                 if (delegation == NULL)
 451                         break;
 452                 if (!can_open_delegated(delegation, open_mode))
 453                         break;
 454                 /* Save the delegation */
 455                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 456                 rcu_read_unlock();
 457                 lock_kernel();
 458                 ret = _nfs4_do_access(state->inode, state->owner->so_cred, open_mode);
 459                 unlock_kernel();
 460                 if (ret != 0)
 461                         goto out;
 462                 ret = -EAGAIN;
 463                 rcu_read_lock();
 464                 delegation = rcu_dereference(nfsi->delegation);
 465                 /* If no delegation, try a cached open */
 466                 if (delegation == NULL)
 467                         continue;
 468                 /* Is the delegation still valid? */
 469                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 470                         continue;
 471                 rcu_read_unlock();
 472                 update_open_stateid(state, NULL, &stateid, open_mode);
 473                 goto out_return_state;
 474         }
 475         rcu_read_unlock();
 476 out:
 477         return ERR_PTR(ret);
 478 out_return_state:
 479         atomic_inc(&state->count);
 480         return state;
 481 }
 482
 483 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 484 {
 485         struct inode *inode;
 486         struct nfs4_state *state = NULL;
 487         struct nfs_delegation *delegation;
 488         nfs4_stateid *deleg_stateid = NULL;
 489         int ret;
 490
 491         if (!data->rpc_done) {
 492                 state = nfs4_try_open_cached(data);
 493                 goto out;
 494         }
 495
 496         ret = -EAGAIN;
 497         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 498                 goto err;
 499         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 500         ret = PTR_ERR(inode);
 501         if (IS_ERR(inode))
 502                 goto err;
 503         ret = -ENOMEM;
 504         state = nfs4_get_open_state(inode, data->owner);
 505         if (state == NULL)
 506                 goto err_put_inode;
 507         if (data->o_res.delegation_type != 0) {
 508                 int delegation_flags = 0;
 509
 510                 rcu_read_lock();
 511                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 512                 if (delegation)
 513                         delegation_flags = delegation->flags;
 514                 rcu_read_unlock();
 515                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 516                         nfs_inode_set_delegation(state->inode,
 517                                         data->owner->so_cred,
 518                                         &data->o_res);
 519                 else
 520                         nfs_inode_reclaim_delegation(state->inode,
 521                                         data->owner->so_cred,
 522                                         &data->o_res);
 523         }
 524         rcu_read_lock();
 525         delegation = rcu_dereference(NFS_I(inode)->delegation);
 526         if (delegation != NULL)
 527                 deleg_stateid = &delegation->stateid;
 528         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 529         rcu_read_unlock();
 530         iput(inode);
 531 out:
 532         return state;
 533 err_put_inode:
 534         iput(inode);
 535 err:
 536         return ERR_PTR(ret);
 537 }
 538
 539 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 540 {
 541         struct nfs_inode *nfsi = NFS_I(state->inode);
 542         struct nfs_open_context *ctx;
 543
 544         spin_lock(&state->inode->i_lock);
 545         list_for_each_entry(ctx, &nfsi->open_files, list) {
 546                 if (ctx->state != state)
 547                         continue;
 548                 get_nfs_open_context(ctx);
 549                 spin_unlock(&state->inode->i_lock);
 550                 return ctx;
 551         }
 552         spin_unlock(&state->inode->i_lock);
 553         return ERR_PTR(-ENOENT);
 554 }
 555
 556 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 557 {
 558         struct nfs4_state *newstate;
 559         int ret;
 560
 561         opendata->o_arg.open_flags = openflags;
 562         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 563         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 564         nfs4_init_opendata_res(opendata);
 565         ret = _nfs4_proc_open(opendata);
 566         if (ret != 0)
 567                 return ret;
 568         newstate = nfs4_opendata_to_nfs4_state(opendata);
 569         if (IS_ERR(newstate))
 570                 return PTR_ERR(newstate);
 571         nfs4_close_state(&opendata->path, newstate, openflags);
 572         *res = newstate;
 573         return 0;
 574 }
 575
 576 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 577 {
 578         struct nfs4_state *newstate;
 579         int ret;
 580
 581         /* memory barrier prior to reading state->n_* */
 582         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 583         smp_rmb();
 584         if (state->n_rdwr != 0) {
 585                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 586                 if (ret != 0)
 587                         return ret;
 588                 if (newstate != state)
 589                         return -ESTALE;
 590         }
 591         if (state->n_wronly != 0) {
 592                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 593                 if (ret != 0)
 594                         return ret;
 595                 if (newstate != state)
 596                         return -ESTALE;
 597         }
 598         if (state->n_rdonly != 0) {
 599                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 600                 if (ret != 0)
 601                         return ret;
 602                 if (newstate != state)
 603                         return -ESTALE;
 604         }
 605         /*
 606          * We may have performed cached opens for all three recoveries.
 607          * Check if we need to update the current stateid.
 608          */
 609         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 610             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 611                 spin_lock(&state->owner->so_lock);
 612                 spin_lock(&state->inode->i_lock);
 613                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 614                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 615                 spin_unlock(&state->inode->i_lock);
 616                 spin_unlock(&state->owner->so_lock);
 617         }
 618         return 0;
 619 }
 620
 621 /*
 622  * OPEN_RECLAIM:
 623  *      reclaim state on the server after a reboot.
 624  */
 625 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 626 {
 627         struct nfs_delegation *delegation;
 628         struct nfs4_opendata *opendata;
 629         int delegation_type = 0;
 630         int status;
 631
 632         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 633         if (opendata == NULL)
 634                 return -ENOMEM;
 635         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 636         opendata->o_arg.fh = NFS_FH(state->inode);
 637         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 638         rcu_read_lock();
 639         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 640         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 641                 delegation_type = delegation->flags;
 642         rcu_read_unlock();
 643         opendata->o_arg.u.delegation_type = delegation_type;
 644         status = nfs4_open_recover(opendata, state);
 645         nfs4_opendata_put(opendata);
 646         return status;
 647 }
 648
 649 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 650 {
 651         struct nfs_server *server = NFS_SERVER(state->inode);
 652         struct nfs4_exception exception = { };
 653         int err;
 654         do {
 655                 err = _nfs4_do_open_reclaim(ctx, state);
 656                 if (err != -NFS4ERR_DELAY)
 657                         break;
 658                 nfs4_handle_exception(server, err, &exception);
 659         } while (exception.retry);
 660         return err;
 661 }
 662
 663 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 664 {
 665         struct nfs_open_context *ctx;
 666         int ret;
 667
 668         ctx = nfs4_state_find_open_context(state);
 669         if (IS_ERR(ctx))
 670                 return PTR_ERR(ctx);
 671         ret = nfs4_do_open_reclaim(ctx, state);
 672         put_nfs_open_context(ctx);
 673         return ret;
 674 }
 675
 676 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 677 {
 678         struct nfs4_state_owner  *sp  = state->owner;
 679         struct nfs4_opendata *opendata;
 680         int ret;
 681
 682         opendata = nfs4_opendata_alloc(&ctx->path, sp, 0, NULL);
 683         if (opendata == NULL)
 684                 return -ENOMEM;
 685         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 686         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 687                         sizeof(opendata->o_arg.u.delegation.data));
 688         ret = nfs4_open_recover(opendata, state);
 689         nfs4_opendata_put(opendata);
 690         return ret;
 691 }
 692
 693 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 694 {
 695         struct nfs4_exception exception = { };
 696         struct nfs_server *server = NFS_SERVER(state->inode);
 697         int err;
 698         do {
 699                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 700                 switch (err) {
 701                         case 0:
 702                                 return err;
 703                         case -NFS4ERR_STALE_CLIENTID:
 704                         case -NFS4ERR_STALE_STATEID:
 705                         case -NFS4ERR_EXPIRED:
 706                                 /* Don't recall a delegation if it was lost */
 707                                 nfs4_schedule_state_recovery(server->nfs_client);
 708                                 return err;
 709                 }
 710                 err = nfs4_handle_exception(server, err, &exception);
 711         } while (exception.retry);
 712         return err;
 713 }
 714
 715 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 716 {
 717         struct nfs4_opendata *data = calldata;
 718         struct  rpc_message msg = {
 719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 720                 .rpc_argp = &data->c_arg,
 721                 .rpc_resp = &data->c_res,
 722                 .rpc_cred = data->owner->so_cred,
 723         };
 724         data->timestamp = jiffies;
 725         rpc_call_setup(task, &msg, 0);
 726 }
 727
 728 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 729 {
 730         struct nfs4_opendata *data = calldata;
 731
 732         data->rpc_status = task->tk_status;
 733         if (RPC_ASSASSINATED(task))
 734                 return;
 735         if (data->rpc_status == 0) {
 736                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 737                                 sizeof(data->o_res.stateid.data));
 738                 renew_lease(data->o_res.server, data->timestamp);
 739                 data->rpc_done = 1;
 740         }
 741         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 742         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 743 }
 744
 745 static void nfs4_open_confirm_release(void *calldata)
 746 {
 747         struct nfs4_opendata *data = calldata;
 748         struct nfs4_state *state = NULL;
 749
 750         /* If this request hasn't been cancelled, do nothing */
 751         if (data->cancelled == 0)
 752                 goto out_free;
 753         /* In case of error, no cleanup! */
 754         if (!data->rpc_done)
 755                 goto out_free;
 756         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 757         state = nfs4_opendata_to_nfs4_state(data);
 758         if (!IS_ERR(state))
 759                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 760 out_free:
 761         nfs4_opendata_put(data);
 762 }
 763
 764 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 765         .rpc_call_prepare = nfs4_open_confirm_prepare,
 766         .rpc_call_done = nfs4_open_confirm_done,
 767         .rpc_release = nfs4_open_confirm_release,
 768 };
 769
 770 /*
 771  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 772  */
 773 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 774 {
 775         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 776         struct rpc_task *task;
 777         int status;
 778
 779         kref_get(&data->kref);
 780         data->rpc_done = 0;
 781         data->rpc_status = 0;
 782         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 783         if (IS_ERR(task))
 784                 return PTR_ERR(task);
 785         status = nfs4_wait_for_completion_rpc_task(task);
 786         if (status != 0) {
 787                 data->cancelled = 1;
 788                 smp_wmb();
 789         } else
 790                 status = data->rpc_status;
 791         rpc_put_task(task);
 792         return status;
 793 }
 794
 795 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 796 {
 797         struct nfs4_opendata *data = calldata;
 798         struct nfs4_state_owner *sp = data->owner;
 799         struct rpc_message msg = {
 800                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 801                 .rpc_argp = &data->o_arg,
 802                 .rpc_resp = &data->o_res,
 803                 .rpc_cred = sp->so_cred,
 804         };
 805
 806         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 807                 return;
 808         /*
 809          * Check if we still need to send an OPEN call, or if we can use
 810          * a delegation instead.
 811          */
 812         if (data->state != NULL) {
 813                 struct nfs_delegation *delegation;
 814
 815                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 816                         goto out_no_action;
 817                 rcu_read_lock();
 818                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 819                 if (delegation != NULL &&
 820                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 821                         rcu_read_unlock();
 822                         goto out_no_action;
 823                 }
 824                 rcu_read_unlock();
 825         }
 826         /* Update sequence id. */
 827         data->o_arg.id = sp->so_owner_id.id;
 828         data->o_arg.clientid = sp->so_client->cl_clientid;
 829         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 830                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 831         data->timestamp = jiffies;
 832         rpc_call_setup(task, &msg, 0);
 833         return;
 834 out_no_action:
 835         task->tk_action = NULL;
 836
 837 }
 838
 839 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 840 {
 841         struct nfs4_opendata *data = calldata;
 842
 843         data->rpc_status = task->tk_status;
 844         if (RPC_ASSASSINATED(task))
 845                 return;
 846         if (task->tk_status == 0) {
 847                 switch (data->o_res.f_attr->mode & S_IFMT) {
 848                         case S_IFREG:
 849                                 break;
 850                         case S_IFLNK:
 851                                 data->rpc_status = -ELOOP;
 852                                 break;
 853                         case S_IFDIR:
 854                                 data->rpc_status = -EISDIR;
 855                                 break;
 856                         default:
 857                                 data->rpc_status = -ENOTDIR;
 858                 }
 859                 renew_lease(data->o_res.server, data->timestamp);
 860                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 861                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 862         }
 863         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 864         data->rpc_done = 1;
 865 }
 866
 867 static void nfs4_open_release(void *calldata)
 868 {
 869         struct nfs4_opendata *data = calldata;
 870         struct nfs4_state *state = NULL;
 871
 872         /* If this request hasn't been cancelled, do nothing */
 873         if (data->cancelled == 0)
 874                 goto out_free;
 875         /* In case of error, no cleanup! */
 876         if (data->rpc_status != 0 || !data->rpc_done)
 877                 goto out_free;
 878         /* In case we need an open_confirm, no cleanup! */
 879         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 880                 goto out_free;
 881         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 882         state = nfs4_opendata_to_nfs4_state(data);
 883         if (!IS_ERR(state))
 884                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 885 out_free:
 886         nfs4_opendata_put(data);
 887 }
 888
 889 static const struct rpc_call_ops nfs4_open_ops = {
 890         .rpc_call_prepare = nfs4_open_prepare,
 891         .rpc_call_done = nfs4_open_done,
 892         .rpc_release = nfs4_open_release,
 893 };
 894
 895 /*
 896  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 897  */
 898 static int _nfs4_proc_open(struct nfs4_opendata *data)
 899 {
 900         struct inode *dir = data->dir->d_inode;
 901         struct nfs_server *server = NFS_SERVER(dir);
 902         struct nfs_openargs *o_arg = &data->o_arg;
 903         struct nfs_openres *o_res = &data->o_res;
 904         struct rpc_task *task;
 905         int status;
 906
 907         kref_get(&data->kref);
 908         data->rpc_done = 0;
 909         data->rpc_status = 0;
 910         data->cancelled = 0;
 911         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 912         if (IS_ERR(task))
 913                 return PTR_ERR(task);
 914         status = nfs4_wait_for_completion_rpc_task(task);
 915         if (status != 0) {
 916                 data->cancelled = 1;
 917                 smp_wmb();
 918         } else
 919                 status = data->rpc_status;
 920         rpc_put_task(task);
 921         if (status != 0 || !data->rpc_done)
 922                 return status;
 923
 924         if (o_arg->open_flags & O_CREAT) {
 925                 update_changeattr(dir, &o_res->cinfo);
 926                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 927         } else
 928                 nfs_refresh_inode(dir, o_res->dir_attr);
 929         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 930                 status = _nfs4_proc_open_confirm(data);
 931                 if (status != 0)
 932                         return status;
 933         }
 934         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 935                 return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 936         return 0;
 937 }
 938
 939 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 940 {
 941         struct nfs_access_entry cache;
 942         int mask = 0;
 943         int status;
 944
 945         if (openflags & FMODE_READ)
 946                 mask |= MAY_READ;
 947         if (openflags & FMODE_WRITE)
 948                 mask |= MAY_WRITE;
 949         if (openflags & FMODE_EXEC)
 950                 mask |= MAY_EXEC;
 951         status = nfs_access_get_cached(inode, cred, &cache);
 952         if (status == 0)
 953                 goto out;
 954
 955         /* Be clever: ask server to check for all possible rights */
 956         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 957         cache.cred = cred;
 958         cache.jiffies = jiffies;
 959         status = _nfs4_proc_access(inode, &cache);
 960         if (status != 0)
 961                 return status;
 962         nfs_access_add_cache(inode, &cache);
 963 out:
 964         if ((cache.mask & mask) == mask)
 965                 return 0;
 966         return -EACCES;
 967 }
 968
 969 static int nfs4_recover_expired_lease(struct nfs_server *server)
 970 {
 971         struct nfs_client *clp = server->nfs_client;
 972         int ret;
 973
 974         for (;;) {
 975                 ret = nfs4_wait_clnt_recover(server->client, clp);
 976                 if (ret != 0)
 977                         return ret;
 978                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 979                         break;
 980                 nfs4_schedule_state_recovery(clp);
 981         }
 982         return 0;
 983 }
 984
 985 /*
 986  * OPEN_EXPIRED:
 987  *      reclaim state on the server after a network partition.
 988  *      Assumes caller holds the appropriate lock
 989  */
 990 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 991 {
 992         struct nfs4_opendata *opendata;
 993         int ret;
 994
 995         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 996         if (opendata == NULL)
 997                 return -ENOMEM;
 998         ret = nfs4_open_recover(opendata, state);
 999         if (ret == -ESTALE) {
1000                 /* Invalidate the state owner so we don't ever use it again */
1001                 nfs4_drop_state_owner(state->owner);
1002                 d_drop(ctx->path.dentry);
1003         }
1004         nfs4_opendata_put(opendata);
1005         return ret;
1006 }
1007
1008 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1009 {
1010         struct nfs_server *server = NFS_SERVER(state->inode);
1011         struct nfs4_exception exception = { };
1012         int err;
1013
1014         do {
1015                 err = _nfs4_open_expired(ctx, state);
1016                 if (err == -NFS4ERR_DELAY)
1017                         nfs4_handle_exception(server, err, &exception);
1018         } while (exception.retry);
1019         return err;
1020 }
1021
1022 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1023 {
1024         struct nfs_open_context *ctx;
1025         int ret;
1026
1027         ctx = nfs4_state_find_open_context(state);
1028         if (IS_ERR(ctx))
1029                 return PTR_ERR(ctx);
1030         ret = nfs4_do_open_expired(ctx, state);
1031         put_nfs_open_context(ctx);
1032         return ret;
1033 }
1034
1035 /*
1036  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1037  * fields corresponding to attributes that were used to store the verifier.
1038  * Make sure we clobber those fields in the later setattr call
1039  */
1040 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1041 {
1042         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1043             !(sattr->ia_valid & ATTR_ATIME_SET))
1044                 sattr->ia_valid |= ATTR_ATIME;
1045
1046         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1047             !(sattr->ia_valid & ATTR_MTIME_SET))
1048                 sattr->ia_valid |= ATTR_MTIME;
1049 }
1050
1051 /*
1052  * Returns a referenced nfs4_state
1053  */
1054 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1055 {
1056         struct nfs4_state_owner  *sp;
1057         struct nfs4_state     *state = NULL;
1058         struct nfs_server       *server = NFS_SERVER(dir);
1059         struct nfs_client *clp = server->nfs_client;
1060         struct nfs4_opendata *opendata;
1061         int status;
1062
1063         /* Protect against reboot recovery conflicts */
1064         status = -ENOMEM;
1065         if (!(sp = nfs4_get_state_owner(server, cred))) {
1066                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1067                 goto out_err;
1068         }
1069         status = nfs4_recover_expired_lease(server);
1070         if (status != 0)
1071                 goto err_put_state_owner;
1072         if (path->dentry->d_inode != NULL)
1073                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1074         down_read(&clp->cl_sem);
1075         status = -ENOMEM;
1076         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1077         if (opendata == NULL)
1078                 goto err_release_rwsem;
1079
1080         if (path->dentry->d_inode != NULL)
1081                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1082
1083         status = _nfs4_proc_open(opendata);
1084         if (status != 0)
1085                 goto err_opendata_put;
1086
1087         if (opendata->o_arg.open_flags & O_EXCL)
1088                 nfs4_exclusive_attrset(opendata, sattr);
1089
1090         state = nfs4_opendata_to_nfs4_state(opendata);
1091         status = PTR_ERR(state);
1092         if (IS_ERR(state))
1093                 goto err_opendata_put;
1094         nfs4_opendata_put(opendata);
1095         nfs4_put_state_owner(sp);
1096         up_read(&clp->cl_sem);
1097         *res = state;
1098         return 0;
1099 err_opendata_put:
1100         nfs4_opendata_put(opendata);
1101 err_release_rwsem:
1102         up_read(&clp->cl_sem);
1103 err_put_state_owner:
1104         nfs4_put_state_owner(sp);
1105 out_err:
1106         *res = NULL;
1107         return status;
1108 }
1109
1110
1111 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1112 {
1113         struct nfs4_exception exception = { };
1114         struct nfs4_state *res;
1115         int status;
1116
1117         do {
1118                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1119                 if (status == 0)
1120                         break;
1121                 /* NOTE: BAD_SEQID means the server and client disagree about the
1122                  * book-keeping w.r.t. state-changing operations
1123                  * (OPEN/CLOSE/LOCK/LOCKU...)
1124                  * It is actually a sign of a bug on the client or on the server.
1125                  *
1126                  * If we receive a BAD_SEQID error in the particular case of
1127                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1128                  * have unhashed the old state_owner for us, and that we can
1129                  * therefore safely retry using a new one. We should still warn
1130                  * the user though...
1131                  */
1132                 if (status == -NFS4ERR_BAD_SEQID) {
1133                         printk(KERN_WARNING "NFS: v4 server %s "
1134                                         " returned a bad sequence-id error!\n",
1135                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1136                         exception.retry = 1;
1137                         continue;
1138                 }
1139                 /*
1140                  * BAD_STATEID on OPEN means that the server cancelled our
1141                  * state before it received the OPEN_CONFIRM.
1142                  * Recover by retrying the request as per the discussion
1143                  * on Page 181 of RFC3530.
1144                  */
1145                 if (status == -NFS4ERR_BAD_STATEID) {
1146                         exception.retry = 1;
1147                         continue;
1148                 }
1149                 if (status == -EAGAIN) {
1150                         /* We must have found a delegation */
1151                         exception.retry = 1;
1152                         continue;
1153                 }
1154                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1155                                         status, &exception));
1156         } while (exception.retry);
1157         return res;
1158 }
1159
1160 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1161                 struct iattr *sattr, struct nfs4_state *state)
1162 {
1163         struct nfs_server *server = NFS_SERVER(inode);
1164         struct nfs_setattrargs  arg = {
1165                 .fh             = NFS_FH(inode),
1166                 .iap            = sattr,
1167                 .server         = server,
1168                 .bitmask = server->attr_bitmask,
1169         };
1170         struct nfs_setattrres  res = {
1171                 .fattr          = fattr,
1172                 .server         = server,
1173         };
1174         struct rpc_message msg = {
1175                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1176                 .rpc_argp       = &arg,
1177                 .rpc_resp       = &res,
1178         };
1179         unsigned long timestamp = jiffies;
1180         int status;
1181
1182         nfs_fattr_init(fattr);
1183
1184         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1185                 /* Use that stateid */
1186         } else if (state != NULL) {
1187                 msg.rpc_cred = state->owner->so_cred;
1188                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1189         } else
1190                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1191
1192         status = rpc_call_sync(server->client, &msg, 0);
1193         if (status == 0 && state != NULL)
1194                 renew_lease(server, timestamp);
1195         return status;
1196 }
1197
1198 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1199                 struct iattr *sattr, struct nfs4_state *state)
1200 {
1201         struct nfs_server *server = NFS_SERVER(inode);
1202         struct nfs4_exception exception = { };
1203         int err;
1204         do {
1205                 err = nfs4_handle_exception(server,
1206                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1207                                 &exception);
1208         } while (exception.retry);
1209         return err;
1210 }
1211
1212 struct nfs4_closedata {
1213         struct path path;
1214         struct inode *inode;
1215         struct nfs4_state *state;
1216         struct nfs_closeargs arg;
1217         struct nfs_closeres res;
1218         struct nfs_fattr fattr;
1219         unsigned long timestamp;
1220 };
1221
1222 static void nfs4_free_closedata(void *data)
1223 {
1224         struct nfs4_closedata *calldata = data;
1225         struct nfs4_state_owner *sp = calldata->state->owner;
1226
1227         nfs4_put_open_state(calldata->state);
1228         nfs_free_seqid(calldata->arg.seqid);
1229         nfs4_put_state_owner(sp);
1230         dput(calldata->path.dentry);
1231         mntput(calldata->path.mnt);
1232         kfree(calldata);
1233 }
1234
1235 static void nfs4_close_done(struct rpc_task *task, void *data)
1236 {
1237         struct nfs4_closedata *calldata = data;
1238         struct nfs4_state *state = calldata->state;
1239         struct nfs_server *server = NFS_SERVER(calldata->inode);
1240
1241         if (RPC_ASSASSINATED(task))
1242                 return;
1243         /* hmm. we are done with the inode, and in the process of freeing
1244          * the state_owner. we keep this around to process errors
1245          */
1246         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1247         switch (task->tk_status) {
1248                 case 0:
1249                         nfs_set_open_stateid(state, &calldata->res.stateid, calldata->arg.open_flags);
1250                         renew_lease(server, calldata->timestamp);
1251                         break;
1252                 case -NFS4ERR_STALE_STATEID:
1253                 case -NFS4ERR_EXPIRED:
1254                         break;
1255                 default:
1256                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1257                                 rpc_restart_call(task);
1258                                 return;
1259                         }
1260         }
1261         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1262 }
1263
1264 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1265 {
1266         struct nfs4_closedata *calldata = data;
1267         struct nfs4_state *state = calldata->state;
1268         struct rpc_message msg = {
1269                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1270                 .rpc_argp = &calldata->arg,
1271                 .rpc_resp = &calldata->res,
1272                 .rpc_cred = state->owner->so_cred,
1273         };
1274         int clear_rd, clear_wr, clear_rdwr;
1275         int mode;
1276
1277         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1278                 return;
1279
1280         mode = FMODE_READ|FMODE_WRITE;
1281         clear_rd = clear_wr = clear_rdwr = 0;
1282         spin_lock(&state->owner->so_lock);
1283         spin_lock(&calldata->inode->i_lock);
1284         /* Calculate the change in open mode */
1285         if (state->n_rdwr == 0) {
1286                 if (state->n_rdonly == 0) {
1287                         mode &= ~FMODE_READ;
1288                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1289                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1290                 }
1291                 if (state->n_wronly == 0) {
1292                         mode &= ~FMODE_WRITE;
1293                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1294                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1295                 }
1296         }
1297         spin_unlock(&calldata->inode->i_lock);
1298         spin_unlock(&state->owner->so_lock);
1299         if (!clear_rd && !clear_wr && !clear_rdwr) {
1300                 /* Note: exit _without_ calling nfs4_close_done */
1301                 task->tk_action = NULL;
1302                 return;
1303         }
1304         nfs_fattr_init(calldata->res.fattr);
1305         if (mode != 0)
1306                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1307         calldata->arg.open_flags = mode;
1308         calldata->timestamp = jiffies;
1309         rpc_call_setup(task, &msg, 0);
1310 }
1311
1312 static const struct rpc_call_ops nfs4_close_ops = {
1313         .rpc_call_prepare = nfs4_close_prepare,
1314         .rpc_call_done = nfs4_close_done,
1315         .rpc_release = nfs4_free_closedata,
1316 };
1317
1318 /*
1319  * It is possible for data to be read/written from a mem-mapped file
1320  * after the sys_close call (which hits the vfs layer as a flush).
1321  * This means that we can't safely call nfsv4 close on a file until
1322  * the inode is cleared. This in turn means that we are not good
1323  * NFSv4 citizens - we do not indicate to the server to update the file's
1324  * share state even when we are done with one of the three share
1325  * stateid's in the inode.
1326  *
1327  * NOTE: Caller must be holding the sp->so_owner semaphore!
1328  */
1329 int nfs4_do_close(struct path *path, struct nfs4_state *state)
1330 {
1331         struct nfs_server *server = NFS_SERVER(state->inode);
1332         struct nfs4_closedata *calldata;
1333         struct nfs4_state_owner *sp = state->owner;
1334         struct rpc_task *task;
1335         int status = -ENOMEM;
1336
1337         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1338         if (calldata == NULL)
1339                 goto out;
1340         calldata->inode = state->inode;
1341         calldata->state = state;
1342         calldata->arg.fh = NFS_FH(state->inode);
1343         calldata->arg.stateid = &state->open_stateid;
1344         /* Serialization for the sequence id */
1345         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1346         if (calldata->arg.seqid == NULL)
1347                 goto out_free_calldata;
1348         calldata->arg.bitmask = server->attr_bitmask;
1349         calldata->res.fattr = &calldata->fattr;
1350         calldata->res.server = server;
1351         calldata->path.mnt = mntget(path->mnt);
1352         calldata->path.dentry = dget(path->dentry);
1353
1354         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_close_ops, calldata);
1355         if (IS_ERR(task))
1356                 return PTR_ERR(task);
1357         rpc_put_task(task);
1358         return 0;
1359 out_free_calldata:
1360         kfree(calldata);
1361 out:
1362         nfs4_put_open_state(state);
1363         nfs4_put_state_owner(sp);
1364         return status;
1365 }
1366
1367 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1368 {
1369         struct file *filp;
1370         int ret;
1371
1372         /* If the open_intent is for execute, we have an extra check to make */
1373         if (nd->intent.open.flags & FMODE_EXEC) {
1374                 ret = _nfs4_do_access(state->inode,
1375                                 state->owner->so_cred,
1376                                 nd->intent.open.flags);
1377                 if (ret < 0)
1378                         goto out_close;
1379         }
1380         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1381         if (!IS_ERR(filp)) {
1382                 struct nfs_open_context *ctx;
1383                 ctx = (struct nfs_open_context *)filp->private_data;
1384                 ctx->state = state;
1385                 return 0;
1386         }
1387         ret = PTR_ERR(filp);
1388 out_close:
1389         nfs4_close_state(path, state, nd->intent.open.flags);
1390         return ret;
1391 }
1392
1393 struct dentry *
1394 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1395 {
1396         struct path path = {
1397                 .mnt = nd->mnt,
1398                 .dentry = dentry,
1399         };
1400         struct iattr attr;
1401         struct rpc_cred *cred;
1402         struct nfs4_state *state;
1403         struct dentry *res;
1404
1405         if (nd->flags & LOOKUP_CREATE) {
1406                 attr.ia_mode = nd->intent.open.create_mode;
1407                 attr.ia_valid = ATTR_MODE;
1408                 if (!IS_POSIXACL(dir))
1409                         attr.ia_mode &= ~current->fs->umask;
1410         } else {
1411                 attr.ia_valid = 0;
1412                 BUG_ON(nd->intent.open.flags & O_CREAT);
1413         }
1414
1415         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1416         if (IS_ERR(cred))
1417                 return (struct dentry *)cred;
1418         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1419         put_rpccred(cred);
1420         if (IS_ERR(state)) {
1421                 if (PTR_ERR(state) == -ENOENT)
1422                         d_add(dentry, NULL);
1423                 return (struct dentry *)state;
1424         }
1425         res = d_add_unique(dentry, igrab(state->inode));
1426         if (res != NULL)
1427                 dentry = res;
1428         nfs4_intent_set_file(nd, &path, state);
1429         return res;
1430 }
1431
1432 int
1433 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1434 {
1435         struct path path = {
1436                 .mnt = nd->mnt,
1437                 .dentry = dentry,
1438         };
1439         struct rpc_cred *cred;
1440         struct nfs4_state *state;
1441
1442         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1443         if (IS_ERR(cred))
1444                 return PTR_ERR(cred);
1445         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1446         put_rpccred(cred);
1447         if (IS_ERR(state)) {
1448                 switch (PTR_ERR(state)) {
1449                         case -EPERM:
1450                         case -EACCES:
1451                         case -EDQUOT:
1452                         case -ENOSPC:
1453                         case -EROFS:
1454                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1455                                 return 1;
1456                         default:
1457                                 goto out_drop;
1458                 }
1459         }
1460         if (state->inode == dentry->d_inode) {
1461                 nfs4_intent_set_file(nd, &path, state);
1462                 return 1;
1463         }
1464         nfs4_close_state(&path, state, openflags);
1465 out_drop:
1466         d_drop(dentry);
1467         return 0;
1468 }
1469
1470
1471 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1472 {
1473         struct nfs4_server_caps_res res = {};
1474         struct rpc_message msg = {
1475                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1476                 .rpc_argp = fhandle,
1477                 .rpc_resp = &res,
1478         };
1479         int status;
1480
1481         status = rpc_call_sync(server->client, &msg, 0);
1482         if (status == 0) {
1483                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1484                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1485                         server->caps |= NFS_CAP_ACLS;
1486                 if (res.has_links != 0)
1487                         server->caps |= NFS_CAP_HARDLINKS;
1488                 if (res.has_symlinks != 0)
1489                         server->caps |= NFS_CAP_SYMLINKS;
1490                 server->acl_bitmask = res.acl_bitmask;
1491         }
1492         return status;
1493 }
1494
1495 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1496 {
1497         struct nfs4_exception exception = { };
1498         int err;
1499         do {
1500                 err = nfs4_handle_exception(server,
1501                                 _nfs4_server_capabilities(server, fhandle),
1502                                 &exception);
1503         } while (exception.retry);
1504         return err;
1505 }
1506
1507 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1508                 struct nfs_fsinfo *info)
1509 {
1510         struct nfs4_lookup_root_arg args = {
1511                 .bitmask = nfs4_fattr_bitmap,
1512         };
1513         struct nfs4_lookup_res res = {
1514                 .server = server,
1515                 .fattr = info->fattr,
1516                 .fh = fhandle,
1517         };
1518         struct rpc_message msg = {
1519                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1520                 .rpc_argp = &args,
1521                 .rpc_resp = &res,
1522         };
1523         nfs_fattr_init(info->fattr);
1524         return rpc_call_sync(server->client, &msg, 0);
1525 }
1526
1527 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1528                 struct nfs_fsinfo *info)
1529 {
1530         struct nfs4_exception exception = { };
1531         int err;
1532         do {
1533                 err = nfs4_handle_exception(server,
1534                                 _nfs4_lookup_root(server, fhandle, info),
1535                                 &exception);
1536         } while (exception.retry);
1537         return err;
1538 }
1539
1540 /*
1541  * get the file handle for the "/" directory on the server
1542  */
1543 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1544                               struct nfs_fsinfo *info)
1545 {
1546         int status;
1547
1548         status = nfs4_lookup_root(server, fhandle, info);
1549         if (status == 0)
1550                 status = nfs4_server_capabilities(server, fhandle);
1551         if (status == 0)
1552                 status = nfs4_do_fsinfo(server, fhandle, info);
1553         return nfs4_map_errors(status);
1554 }
1555
1556 /*
1557  * Get locations and (maybe) other attributes of a referral.
1558  * Note that we'll actually follow the referral later when
1559  * we detect fsid mismatch in inode revalidation
1560  */
1561 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1562 {
1563         int status = -ENOMEM;
1564         struct page *page = NULL;
1565         struct nfs4_fs_locations *locations = NULL;
1566
1567         page = alloc_page(GFP_KERNEL);
1568         if (page == NULL)
1569                 goto out;
1570         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1571         if (locations == NULL)
1572                 goto out;
1573
1574         status = nfs4_proc_fs_locations(dir, name, locations, page);
1575         if (status != 0)
1576                 goto out;
1577         /* Make sure server returned a different fsid for the referral */
1578         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1579                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1580                 status = -EIO;
1581                 goto out;
1582         }
1583
1584         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1585         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1586         if (!fattr->mode)
1587                 fattr->mode = S_IFDIR;
1588         memset(fhandle, 0, sizeof(struct nfs_fh));
1589 out:
1590         if (page)
1591                 __free_page(page);
1592         if (locations)
1593                 kfree(locations);
1594         return status;
1595 }
1596
1597 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1598 {
1599         struct nfs4_getattr_arg args = {
1600                 .fh = fhandle,
1601                 .bitmask = server->attr_bitmask,
1602         };
1603         struct nfs4_getattr_res res = {
1604                 .fattr = fattr,
1605                 .server = server,
1606         };
1607         struct rpc_message msg = {
1608                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1609                 .rpc_argp = &args,
1610                 .rpc_resp = &res,
1611         };
1612
1613         nfs_fattr_init(fattr);
1614         return rpc_call_sync(server->client, &msg, 0);
1615 }
1616
1617 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1618 {
1619         struct nfs4_exception exception = { };
1620         int err;
1621         do {
1622                 err = nfs4_handle_exception(server,
1623                                 _nfs4_proc_getattr(server, fhandle, fattr),
1624                                 &exception);
1625         } while (exception.retry);
1626         return err;
1627 }
1628
1629 /*
1630  * The file is not closed if it is opened due to the a request to change
1631  * the size of the file. The open call will not be needed once the
1632  * VFS layer lookup-intents are implemented.
1633  *
1634  * Close is called when the inode is destroyed.
1635  * If we haven't opened the file for O_WRONLY, we
1636  * need to in the size_change case to obtain a stateid.
1637  *
1638  * Got race?
1639  * Because OPEN is always done by name in nfsv4, it is
1640  * possible that we opened a different file by the same
1641  * name.  We can recognize this race condition, but we
1642  * can't do anything about it besides returning an error.
1643  *
1644  * This will be fixed with VFS changes (lookup-intent).
1645  */
1646 static int
1647 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1648                   struct iattr *sattr)
1649 {
1650         struct rpc_cred *cred;
1651         struct inode *inode = dentry->d_inode;
1652         struct nfs_open_context *ctx;
1653         struct nfs4_state *state = NULL;
1654         int status;
1655
1656         nfs_fattr_init(fattr);
1657
1658         cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
1659         if (IS_ERR(cred))
1660                 return PTR_ERR(cred);
1661
1662         /* Search for an existing open(O_WRITE) file */
1663         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1664         if (ctx != NULL)
1665                 state = ctx->state;
1666
1667         status = nfs4_do_setattr(inode, fattr, sattr, state);
1668         if (status == 0)
1669                 nfs_setattr_update_inode(inode, sattr);
1670         if (ctx != NULL)
1671                 put_nfs_open_context(ctx);
1672         put_rpccred(cred);
1673         return status;
1674 }
1675
1676 static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1677                 struct qstr *name, struct nfs_fh *fhandle,
1678                 struct nfs_fattr *fattr)
1679 {
1680         int                    status;
1681         struct nfs4_lookup_arg args = {
1682                 .bitmask = server->attr_bitmask,
1683                 .dir_fh = dirfh,
1684                 .name = name,
1685         };
1686         struct nfs4_lookup_res res = {
1687                 .server = server,
1688                 .fattr = fattr,
1689                 .fh = fhandle,
1690         };
1691         struct rpc_message msg = {
1692                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1693                 .rpc_argp = &args,
1694                 .rpc_resp = &res,
1695         };
1696
1697         nfs_fattr_init(fattr);
1698
1699         dprintk("NFS call  lookupfh %s\n", name->name);
1700         status = rpc_call_sync(server->client, &msg, 0);
1701         dprintk("NFS reply lookupfh: %d\n", status);
1702         return status;
1703 }
1704
1705 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1706                               struct qstr *name, struct nfs_fh *fhandle,
1707                               struct nfs_fattr *fattr)
1708 {
1709         struct nfs4_exception exception = { };
1710         int err;
1711         do {
1712                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1713                 /* FIXME: !!!! */
1714                 if (err == -NFS4ERR_MOVED) {
1715                         err = -EREMOTE;
1716                         break;
1717                 }
1718                 err = nfs4_handle_exception(server, err, &exception);
1719         } while (exception.retry);
1720         return err;
1721 }
1722
1723 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1724                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1725 {
1726         int status;
1727
1728         dprintk("NFS call  lookup %s\n", name->name);
1729         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1730         if (status == -NFS4ERR_MOVED)
1731                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1732         dprintk("NFS reply lookup: %d\n", status);
1733         return status;
1734 }
1735
1736 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1737 {
1738         struct nfs4_exception exception = { };
1739         int err;
1740         do {
1741                 err = nfs4_handle_exception(NFS_SERVER(dir),
1742                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1743                                 &exception);
1744         } while (exception.retry);
1745         return err;
1746 }
1747
1748 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1749 {
1750         struct nfs4_accessargs args = {
1751                 .fh = NFS_FH(inode),
1752         };
1753         struct nfs4_accessres res = { 0 };
1754         struct rpc_message msg = {
1755                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1756                 .rpc_argp = &args,
1757                 .rpc_resp = &res,
1758                 .rpc_cred = entry->cred,
1759         };
1760         int mode = entry->mask;
1761         int status;
1762
1763         /*
1764          * Determine which access bits we want to ask for...
1765          */
1766         if (mode & MAY_READ)
1767                 args.access |= NFS4_ACCESS_READ;
1768         if (S_ISDIR(inode->i_mode)) {
1769                 if (mode & MAY_WRITE)
1770                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1771                 if (mode & MAY_EXEC)
1772                         args.access |= NFS4_ACCESS_LOOKUP;
1773         } else {
1774                 if (mode & MAY_WRITE)
1775                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1776                 if (mode & MAY_EXEC)
1777                         args.access |= NFS4_ACCESS_EXECUTE;
1778         }
1779         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1780         if (!status) {
1781                 entry->mask = 0;
1782                 if (res.access & NFS4_ACCESS_READ)
1783                         entry->mask |= MAY_READ;
1784                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1785                         entry->mask |= MAY_WRITE;
1786                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1787                         entry->mask |= MAY_EXEC;
1788         }
1789         return status;
1790 }
1791
1792 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1793 {
1794         struct nfs4_exception exception = { };
1795         int err;
1796         do {
1797                 err = nfs4_handle_exception(NFS_SERVER(inode),
1798                                 _nfs4_proc_access(inode, entry),
1799                                 &exception);
1800         } while (exception.retry);
1801         return err;
1802 }
1803
1804 /*
1805  * TODO: For the time being, we don't try to get any attributes
1806  * along with any of the zero-copy operations READ, READDIR,
1807  * READLINK, WRITE.
1808  *
1809  * In the case of the first three, we want to put the GETATTR
1810  * after the read-type operation -- this is because it is hard
1811  * to predict the length of a GETATTR response in v4, and thus
1812  * align the READ data correctly.  This means that the GETATTR
1813  * may end up partially falling into the page cache, and we should
1814  * shift it into the 'tail' of the xdr_buf before processing.
1815  * To do this efficiently, we need to know the total length
1816  * of data received, which doesn't seem to be available outside
1817  * of the RPC layer.
1818  *
1819  * In the case of WRITE, we also want to put the GETATTR after
1820  * the operation -- in this case because we want to make sure
1821  * we get the post-operation mtime and size.  This means that
1822  * we can't use xdr_encode_pages() as written: we need a variant
1823  * of it which would leave room in the 'tail' iovec.
1824  *
1825  * Both of these changes to the XDR layer would in fact be quite
1826  * minor, but I decided to leave them for a subsequent patch.
1827  */
1828 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1829                 unsigned int pgbase, unsigned int pglen)
1830 {
1831         struct nfs4_readlink args = {
1832                 .fh       = NFS_FH(inode),
1833                 .pgbase   = pgbase,
1834                 .pglen    = pglen,
1835                 .pages    = &page,
1836         };
1837         struct rpc_message msg = {
1838                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1839                 .rpc_argp = &args,
1840                 .rpc_resp = NULL,
1841         };
1842
1843         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1844 }
1845
1846 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1847                 unsigned int pgbase, unsigned int pglen)
1848 {
1849         struct nfs4_exception exception = { };
1850         int err;
1851         do {
1852                 err = nfs4_handle_exception(NFS_SERVER(inode),
1853                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1854                                 &exception);
1855         } while (exception.retry);
1856         return err;
1857 }
1858
1859 /*
1860  * Got race?
1861  * We will need to arrange for the VFS layer to provide an atomic open.
1862  * Until then, this create/open method is prone to inefficiency and race
1863  * conditions due to the lookup, create, and open VFS calls from sys_open()
1864  * placed on the wire.
1865  *
1866  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1867  * The file will be opened again in the subsequent VFS open call
1868  * (nfs4_proc_file_open).
1869  *
1870  * The open for read will just hang around to be used by any process that
1871  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1872  */
1873
1874 static int
1875 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1876                  int flags, struct nameidata *nd)
1877 {
1878         struct path path = {
1879                 .mnt = nd->mnt,
1880                 .dentry = dentry,
1881         };
1882         struct nfs4_state *state;
1883         struct rpc_cred *cred;
1884         int status = 0;
1885
1886         cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
1887         if (IS_ERR(cred)) {
1888                 status = PTR_ERR(cred);
1889                 goto out;
1890         }
1891         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1892         put_rpccred(cred);
1893         if (IS_ERR(state)) {
1894                 status = PTR_ERR(state);
1895                 goto out;
1896         }
1897         d_instantiate(dentry, igrab(state->inode));
1898         if (flags & O_EXCL) {
1899                 struct nfs_fattr fattr;
1900                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1901                 if (status == 0)
1902                         nfs_setattr_update_inode(state->inode, sattr);
1903                 nfs_post_op_update_inode(state->inode, &fattr);
1904         }
1905         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1906                 status = nfs4_intent_set_file(nd, &path, state);
1907         else
1908                 nfs4_close_state(&path, state, flags);
1909 out:
1910         return status;
1911 }
1912
1913 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1914 {
1915         struct nfs_server *server = NFS_SERVER(dir);
1916         struct nfs4_remove_arg args = {
1917                 .fh = NFS_FH(dir),
1918                 .name = name,
1919                 .bitmask = server->attr_bitmask,
1920         };
1921         struct nfs_fattr dir_attr;
1922         struct nfs4_remove_res  res = {
1923                 .server = server,
1924                 .dir_attr = &dir_attr,
1925         };
1926         struct rpc_message msg = {
1927                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1928                 .rpc_argp       = &args,
1929                 .rpc_resp       = &res,
1930         };
1931         int                     status;
1932
1933         nfs_fattr_init(res.dir_attr);
1934         status = rpc_call_sync(server->client, &msg, 0);
1935         if (status == 0) {
1936                 update_changeattr(dir, &res.cinfo);
1937                 nfs_post_op_update_inode(dir, res.dir_attr);
1938         }
1939         return status;
1940 }
1941
1942 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1943 {
1944         struct nfs4_exception exception = { };
1945         int err;
1946         do {
1947                 err = nfs4_handle_exception(NFS_SERVER(dir),
1948                                 _nfs4_proc_remove(dir, name),
1949                                 &exception);
1950         } while (exception.retry);
1951         return err;
1952 }
1953
1954 struct unlink_desc {
1955         struct nfs4_remove_arg  args;
1956         struct nfs4_remove_res  res;
1957         struct nfs_fattr dir_attr;
1958 };
1959
1960 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1961                 struct qstr *name)
1962 {
1963         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1964         struct unlink_desc *up;
1965
1966         up = kmalloc(sizeof(*up), GFP_KERNEL);
1967         if (!up)
1968                 return -ENOMEM;
1969
1970         up->args.fh = NFS_FH(dir->d_inode);
1971         up->args.name = name;
1972         up->args.bitmask = server->attr_bitmask;
1973         up->res.server = server;
1974         up->res.dir_attr = &up->dir_attr;
1975
1976         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1977         msg->rpc_argp = &up->args;
1978         msg->rpc_resp = &up->res;
1979         return 0;
1980 }
1981
1982 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1983 {
1984         struct rpc_message *msg = &task->tk_msg;
1985         struct unlink_desc *up;
1986
1987         if (msg->rpc_resp != NULL) {
1988                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1989                 update_changeattr(dir->d_inode, &up->res.cinfo);
1990                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1991                 kfree(up);
1992                 msg->rpc_resp = NULL;
1993                 msg->rpc_argp = NULL;
1994         }
1995         return 0;
1996 }
1997
1998 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1999                 struct inode *new_dir, struct qstr *new_name)
2000 {
2001         struct nfs_server *server = NFS_SERVER(old_dir);
2002         struct nfs4_rename_arg arg = {
2003                 .old_dir = NFS_FH(old_dir),
2004                 .new_dir = NFS_FH(new_dir),
2005                 .old_name = old_name,
2006                 .new_name = new_name,
2007                 .bitmask = server->attr_bitmask,
2008         };
2009         struct nfs_fattr old_fattr, new_fattr;
2010         struct nfs4_rename_res res = {
2011                 .server = server,
2012                 .old_fattr = &old_fattr,
2013                 .new_fattr = &new_fattr,
2014         };
2015         struct rpc_message msg = {
2016                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2017                 .rpc_argp = &arg,
2018                 .rpc_resp = &res,
2019         };
2020         int                     status;
2021
2022         nfs_fattr_init(res.old_fattr);
2023         nfs_fattr_init(res.new_fattr);
2024         status = rpc_call_sync(server->client, &msg, 0);
2025
2026         if (!status) {
2027                 update_changeattr(old_dir, &res.old_cinfo);
2028                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2029                 update_changeattr(new_dir, &res.new_cinfo);
2030                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2031         }
2032         return status;
2033 }
2034
2035 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2036                 struct inode *new_dir, struct qstr *new_name)
2037 {
2038         struct nfs4_exception exception = { };
2039         int err;
2040         do {
2041                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2042                                 _nfs4_proc_rename(old_dir, old_name,
2043                                         new_dir, new_name),
2044                                 &exception);
2045         } while (exception.retry);
2046         return err;
2047 }
2048
2049 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2050 {
2051         struct nfs_server *server = NFS_SERVER(inode);
2052         struct nfs4_link_arg arg = {
2053                 .fh     = NFS_FH(inode),
2054                 .dir_fh = NFS_FH(dir),
2055                 .name   = name,
2056                 .bitmask = server->attr_bitmask,
2057         };
2058         struct nfs_fattr fattr, dir_attr;
2059         struct nfs4_link_res res = {
2060                 .server = server,
2061                 .fattr = &fattr,
2062                 .dir_attr = &dir_attr,
2063         };
2064         struct rpc_message msg = {
2065                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2066                 .rpc_argp = &arg,
2067                 .rpc_resp = &res,
2068         };
2069         int                     status;
2070
2071         nfs_fattr_init(res.fattr);
2072         nfs_fattr_init(res.dir_attr);
2073         status = rpc_call_sync(server->client, &msg, 0);
2074         if (!status) {
2075                 update_changeattr(dir, &res.cinfo);
2076                 nfs_post_op_update_inode(dir, res.dir_attr);
2077                 nfs_post_op_update_inode(inode, res.fattr);
2078         }
2079
2080         return status;
2081 }
2082
2083 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2084 {
2085         struct nfs4_exception exception = { };
2086         int err;
2087         do {
2088                 err = nfs4_handle_exception(NFS_SERVER(inode),
2089                                 _nfs4_proc_link(inode, dir, name),
2090                                 &exception);
2091         } while (exception.retry);
2092         return err;
2093 }
2094
2095 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2096                 struct page *page, unsigned int len, struct iattr *sattr)
2097 {
2098         struct nfs_server *server = NFS_SERVER(dir);
2099         struct nfs_fh fhandle;
2100         struct nfs_fattr fattr, dir_fattr;
2101         struct nfs4_create_arg arg = {
2102                 .dir_fh = NFS_FH(dir),
2103                 .server = server,
2104                 .name = &dentry->d_name,
2105                 .attrs = sattr,
2106                 .ftype = NF4LNK,
2107                 .bitmask = server->attr_bitmask,
2108         };
2109         struct nfs4_create_res res = {
2110                 .server = server,
2111                 .fh = &fhandle,
2112                 .fattr = &fattr,
2113                 .dir_fattr = &dir_fattr,
2114         };
2115         struct rpc_message msg = {
2116                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2117                 .rpc_argp = &arg,
2118                 .rpc_resp = &res,
2119         };
2120         int                     status;
2121
2122         if (len > NFS4_MAXPATHLEN)
2123                 return -ENAMETOOLONG;
2124
2125         arg.u.symlink.pages = &page;
2126         arg.u.symlink.len = len;
2127         nfs_fattr_init(&fattr);
2128         nfs_fattr_init(&dir_fattr);
2129
2130         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2131         if (!status) {
2132                 update_changeattr(dir, &res.dir_cinfo);
2133                 nfs_post_op_update_inode(dir, res.dir_fattr);
2134                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2135         }
2136         return status;
2137 }
2138
2139 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2140                 struct page *page, unsigned int len, struct iattr *sattr)
2141 {
2142         struct nfs4_exception exception = { };
2143         int err;
2144         do {
2145                 err = nfs4_handle_exception(NFS_SERVER(dir),
2146                                 _nfs4_proc_symlink(dir, dentry, page,
2147                                                         len, sattr),
2148                                 &exception);
2149         } while (exception.retry);
2150         return err;
2151 }
2152
2153 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2154                 struct iattr *sattr)
2155 {
2156         struct nfs_server *server = NFS_SERVER(dir);
2157         struct nfs_fh fhandle;
2158         struct nfs_fattr fattr, dir_fattr;
2159         struct nfs4_create_arg arg = {
2160                 .dir_fh = NFS_FH(dir),
2161                 .server = server,
2162                 .name = &dentry->d_name,
2163                 .attrs = sattr,
2164                 .ftype = NF4DIR,
2165                 .bitmask = server->attr_bitmask,
2166         };
2167         struct nfs4_create_res res = {
2168                 .server = server,
2169                 .fh = &fhandle,
2170                 .fattr = &fattr,
2171                 .dir_fattr = &dir_fattr,
2172         };
2173         struct rpc_message msg = {
2174                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2175                 .rpc_argp = &arg,
2176                 .rpc_resp = &res,
2177         };
2178         int                     status;
2179
2180         nfs_fattr_init(&fattr);
2181         nfs_fattr_init(&dir_fattr);
2182
2183         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2184         if (!status) {
2185                 update_changeattr(dir, &res.dir_cinfo);
2186                 nfs_post_op_update_inode(dir, res.dir_fattr);
2187                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2188         }
2189         return status;
2190 }
2191
2192 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2193                 struct iattr *sattr)
2194 {
2195         struct nfs4_exception exception = { };
2196         int err;
2197         do {
2198                 err = nfs4_handle_exception(NFS_SERVER(dir),
2199                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2200                                 &exception);
2201         } while (exception.retry);
2202         return err;
2203 }
2204
2205 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2206                   u64 cookie, struct page *page, unsigned int count, int plus)
2207 {
2208         struct inode            *dir = dentry->d_inode;
2209         struct nfs4_readdir_arg args = {
2210                 .fh = NFS_FH(dir),
2211                 .pages = &page,
2212                 .pgbase = 0,
2213                 .count = count,
2214                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2215         };
2216         struct nfs4_readdir_res res;
2217         struct rpc_message msg = {
2218                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2219                 .rpc_argp = &args,
2220                 .rpc_resp = &res,
2221                 .rpc_cred = cred,
2222         };
2223         int                     status;
2224
2225         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2226                         dentry->d_parent->d_name.name,
2227                         dentry->d_name.name,
2228                         (unsigned long long)cookie);
2229         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2230         res.pgbase = args.pgbase;
2231         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2232         if (status == 0)
2233                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2234         dprintk("%s: returns %d\n", __FUNCTION__, status);
2235         return status;
2236 }
2237
2238 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2239                   u64 cookie, struct page *page, unsigned int count, int plus)
2240 {
2241         struct nfs4_exception exception = { };
2242         int err;
2243         do {
2244                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2245                                 _nfs4_proc_readdir(dentry, cred, cookie,
2246                                         page, count, plus),
2247                                 &exception);
2248         } while (exception.retry);
2249         return err;
2250 }
2251
2252 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2253                 struct iattr *sattr, dev_t rdev)
2254 {
2255         struct nfs_server *server = NFS_SERVER(dir);
2256         struct nfs_fh fh;
2257         struct nfs_fattr fattr, dir_fattr;
2258         struct nfs4_create_arg arg = {
2259                 .dir_fh = NFS_FH(dir),
2260                 .server = server,
2261                 .name = &dentry->d_name,
2262                 .attrs = sattr,
2263                 .bitmask = server->attr_bitmask,
2264         };
2265         struct nfs4_create_res res = {
2266                 .server = server,
2267                 .fh = &fh,
2268                 .fattr = &fattr,
2269                 .dir_fattr = &dir_fattr,
2270         };
2271         struct rpc_message msg = {
2272                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2273                 .rpc_argp = &arg,
2274                 .rpc_resp = &res,
2275         };
2276         int                     status;
2277         int                     mode = sattr->ia_mode;
2278
2279         nfs_fattr_init(&fattr);
2280         nfs_fattr_init(&dir_fattr);
2281
2282         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2283         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2284         if (S_ISFIFO(mode))
2285                 arg.ftype = NF4FIFO;
2286         else if (S_ISBLK(mode)) {
2287                 arg.ftype = NF4BLK;
2288                 arg.u.device.specdata1 = MAJOR(rdev);
2289                 arg.u.device.specdata2 = MINOR(rdev);
2290         }
2291         else if (S_ISCHR(mode)) {
2292                 arg.ftype = NF4CHR;
2293                 arg.u.device.specdata1 = MAJOR(rdev);
2294                 arg.u.device.specdata2 = MINOR(rdev);
2295         }
2296         else
2297                 arg.ftype = NF4SOCK;
2298
2299         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2300         if (status == 0) {
2301                 update_changeattr(dir, &res.dir_cinfo);
2302                 nfs_post_op_update_inode(dir, res.dir_fattr);
2303                 status = nfs_instantiate(dentry, &fh, &fattr);
2304         }
2305         return status;
2306 }
2307
2308 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2309                 struct iattr *sattr, dev_t rdev)
2310 {
2311         struct nfs4_exception exception = { };
2312         int err;
2313         do {
2314                 err = nfs4_handle_exception(NFS_SERVER(dir),
2315                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2316                                 &exception);
2317         } while (exception.retry);
2318         return err;
2319 }
2320
2321 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2322                  struct nfs_fsstat *fsstat)
2323 {
2324         struct nfs4_statfs_arg args = {
2325                 .fh = fhandle,
2326                 .bitmask = server->attr_bitmask,
2327         };
2328         struct rpc_message msg = {
2329                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2330                 .rpc_argp = &args,
2331                 .rpc_resp = fsstat,
2332         };
2333
2334         nfs_fattr_init(fsstat->fattr);
2335         return rpc_call_sync(server->client, &msg, 0);
2336 }
2337
2338 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2339 {
2340         struct nfs4_exception exception = { };
2341         int err;
2342         do {
2343                 err = nfs4_handle_exception(server,
2344                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2345                                 &exception);
2346         } while (exception.retry);
2347         return err;
2348 }
2349
2350 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2351                 struct nfs_fsinfo *fsinfo)
2352 {
2353         struct nfs4_fsinfo_arg args = {
2354                 .fh = fhandle,
2355                 .bitmask = server->attr_bitmask,
2356         };
2357         struct rpc_message msg = {
2358                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2359                 .rpc_argp = &args,
2360                 .rpc_resp = fsinfo,
2361         };
2362
2363         return rpc_call_sync(server->client, &msg, 0);
2364 }
2365
2366 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2367 {
2368         struct nfs4_exception exception = { };
2369         int err;
2370
2371         do {
2372                 err = nfs4_handle_exception(server,
2373                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2374                                 &exception);
2375         } while (exception.retry);
2376         return err;
2377 }
2378
2379 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2380 {
2381         nfs_fattr_init(fsinfo->fattr);
2382         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2383 }
2384
2385 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2386                 struct nfs_pathconf *pathconf)
2387 {
2388         struct nfs4_pathconf_arg args = {
2389                 .fh = fhandle,
2390                 .bitmask = server->attr_bitmask,
2391         };
2392         struct rpc_message msg = {
2393                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2394                 .rpc_argp = &args,
2395                 .rpc_resp = pathconf,
2396         };
2397
2398         /* None of the pathconf attributes are mandatory to implement */
2399         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2400                 memset(pathconf, 0, sizeof(*pathconf));
2401                 return 0;
2402         }
2403
2404         nfs_fattr_init(pathconf->fattr);
2405         return rpc_call_sync(server->client, &msg, 0);
2406 }
2407
2408 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2409                 struct nfs_pathconf *pathconf)
2410 {
2411         struct nfs4_exception exception = { };
2412         int err;
2413
2414         do {
2415                 err = nfs4_handle_exception(server,
2416                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2417                                 &exception);
2418         } while (exception.retry);
2419         return err;
2420 }
2421
2422 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2423 {
2424         struct nfs_server *server = NFS_SERVER(data->inode);
2425
2426         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2427                 rpc_restart_call(task);
2428                 return -EAGAIN;
2429         }
2430         if (task->tk_status > 0)
2431                 renew_lease(server, data->timestamp);
2432         return 0;
2433 }
2434
2435 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2436 {
2437         struct rpc_message msg = {
2438                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2439                 .rpc_argp = &data->args,
2440                 .rpc_resp = &data->res,
2441                 .rpc_cred = data->cred,
2442         };
2443
2444         data->timestamp   = jiffies;
2445
2446         rpc_call_setup(&data->task, &msg, 0);
2447 }
2448
2449 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2450 {
2451         struct inode *inode = data->inode;
2452
2453         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2454                 rpc_restart_call(task);
2455                 return -EAGAIN;
2456         }
2457         if (task->tk_status >= 0) {
2458                 renew_lease(NFS_SERVER(inode), data->timestamp);
2459                 nfs_post_op_update_inode(inode, data->res.fattr);
2460         }
2461         return 0;
2462 }
2463
2464 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2465 {
2466         struct rpc_message msg = {
2467                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2468                 .rpc_argp = &data->args,
2469                 .rpc_resp = &data->res,
2470                 .rpc_cred = data->cred,
2471         };
2472         struct inode *inode = data->inode;
2473         struct nfs_server *server = NFS_SERVER(inode);
2474         int stable;
2475
2476         if (how & FLUSH_STABLE) {
2477                 if (!NFS_I(inode)->ncommit)
2478                         stable = NFS_FILE_SYNC;
2479                 else
2480                         stable = NFS_DATA_SYNC;
2481         } else
2482                 stable = NFS_UNSTABLE;
2483         data->args.stable = stable;
2484         data->args.bitmask = server->attr_bitmask;
2485         data->res.server = server;
2486
2487         data->timestamp   = jiffies;
2488
2489         /* Finalize the task. */
2490         rpc_call_setup(&data->task, &msg, 0);
2491 }
2492
2493 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2494 {
2495         struct inode *inode = data->inode;
2496
2497         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2498                 rpc_restart_call(task);
2499                 return -EAGAIN;
2500         }
2501         if (task->tk_status >= 0)
2502                 nfs_post_op_update_inode(inode, data->res.fattr);
2503         return 0;
2504 }
2505
2506 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2507 {
2508         struct rpc_message msg = {
2509                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2510                 .rpc_argp = &data->args,
2511                 .rpc_resp = &data->res,
2512                 .rpc_cred = data->cred,
2513         };
2514         struct nfs_server *server = NFS_SERVER(data->inode);
2515
2516         data->args.bitmask = server->attr_bitmask;
2517         data->res.server = server;
2518
2519         rpc_call_setup(&data->task, &msg, 0);
2520 }
2521
2522 /*
2523  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2524  * standalone procedure for queueing an asynchronous RENEW.
2525  */
2526 static void nfs4_renew_done(struct rpc_task *task, void *data)
2527 {
2528         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2529         unsigned long timestamp = (unsigned long)data;
2530
2531         if (task->tk_status < 0) {
2532                 switch (task->tk_status) {
2533                         case -NFS4ERR_STALE_CLIENTID:
2534                         case -NFS4ERR_EXPIRED:
2535                         case -NFS4ERR_CB_PATH_DOWN:
2536                                 nfs4_schedule_state_recovery(clp);
2537                 }
2538                 return;
2539         }
2540         spin_lock(&clp->cl_lock);
2541         if (time_before(clp->cl_last_renewal,timestamp))
2542                 clp->cl_last_renewal = timestamp;
2543         spin_unlock(&clp->cl_lock);
2544 }
2545
2546 static const struct rpc_call_ops nfs4_renew_ops = {
2547         .rpc_call_done = nfs4_renew_done,
2548 };
2549
2550 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2551 {
2552         struct rpc_message msg = {
2553                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2554                 .rpc_argp       = clp,
2555                 .rpc_cred       = cred,
2556         };
2557
2558         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2559                         &nfs4_renew_ops, (void *)jiffies);
2560 }
2561
2562 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2563 {
2564         struct rpc_message msg = {
2565                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2566                 .rpc_argp       = clp,
2567                 .rpc_cred       = cred,
2568         };
2569         unsigned long now = jiffies;
2570         int status;
2571
2572         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2573         if (status < 0)
2574                 return status;
2575         spin_lock(&clp->cl_lock);
2576         if (time_before(clp->cl_last_renewal,now))
2577                 clp->cl_last_renewal = now;
2578         spin_unlock(&clp->cl_lock);
2579         return 0;
2580 }
2581
2582 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2583 {
2584         return (server->caps & NFS_CAP_ACLS)
2585                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2586                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2587 }
2588
2589 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2590  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2591  * the stack.
2592  */
2593 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2594
2595 static void buf_to_pages(const void *buf, size_t buflen,
2596                 struct page **pages, unsigned int *pgbase)
2597 {
2598         const void *p = buf;
2599
2600         *pgbase = offset_in_page(buf);
2601         p -= *pgbase;
2602         while (p < buf + buflen) {
2603                 *(pages++) = virt_to_page(p);
2604                 p += PAGE_CACHE_SIZE;
2605         }
2606 }
2607
2608 struct nfs4_cached_acl {
2609         int cached;
2610         size_t len;
2611         char data[0];
2612 };
2613
2614 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2615 {
2616         struct nfs_inode *nfsi = NFS_I(inode);
2617
2618         spin_lock(&inode->i_lock);
2619         kfree(nfsi->nfs4_acl);
2620         nfsi->nfs4_acl = acl;
2621         spin_unlock(&inode->i_lock);
2622 }
2623
2624 static void nfs4_zap_acl_attr(struct inode *inode)
2625 {
2626         nfs4_set_cached_acl(inode, NULL);
2627 }
2628
2629 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2630 {
2631         struct nfs_inode *nfsi = NFS_I(inode);
2632         struct nfs4_cached_acl *acl;
2633         int ret = -ENOENT;
2634
2635         spin_lock(&inode->i_lock);
2636         acl = nfsi->nfs4_acl;
2637         if (acl == NULL)
2638                 goto out;
2639         if (buf == NULL) /* user is just asking for length */
2640                 goto out_len;
2641         if (acl->cached == 0)
2642                 goto out;
2643         ret = -ERANGE; /* see getxattr(2) man page */
2644         if (acl->len > buflen)
2645                 goto out;
2646         memcpy(buf, acl->data, acl->len);
2647 out_len:
2648         ret = acl->len;
2649 out:
2650         spin_unlock(&inode->i_lock);
2651         return ret;
2652 }
2653
2654 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2655 {
2656         struct nfs4_cached_acl *acl;
2657
2658         if (buf && acl_len <= PAGE_SIZE) {
2659                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2660                 if (acl == NULL)
2661                         goto out;
2662                 acl->cached = 1;
2663                 memcpy(acl->data, buf, acl_len);
2664         } else {
2665                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2666                 if (acl == NULL)
2667                         goto out;
2668                 acl->cached = 0;
2669         }
2670         acl->len = acl_len;
2671 out:
2672         nfs4_set_cached_acl(inode, acl);
2673 }
2674
2675 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2676 {
2677         struct page *pages[NFS4ACL_MAXPAGES];
2678         struct nfs_getaclargs args = {
2679                 .fh = NFS_FH(inode),
2680                 .acl_pages = pages,
2681                 .acl_len = buflen,
2682         };
2683         size_t resp_len = buflen;
2684         void *resp_buf;
2685         struct rpc_message msg = {
2686                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2687                 .rpc_argp = &args,
2688                 .rpc_resp = &resp_len,
2689         };
2690         struct page *localpage = NULL;
2691         int ret;
2692
2693         if (buflen < PAGE_SIZE) {
2694                 /* As long as we're doing a round trip to the server anyway,
2695                  * let's be prepared for a page of acl data. */
2696                 localpage = alloc_page(GFP_KERNEL);
2697                 resp_buf = page_address(localpage);
2698                 if (localpage == NULL)
2699                         return -ENOMEM;
2700                 args.acl_pages[0] = localpage;
2701                 args.acl_pgbase = 0;
2702                 resp_len = args.acl_len = PAGE_SIZE;
2703         } else {
2704                 resp_buf = buf;
2705                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2706         }
2707         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2708         if (ret)
2709                 goto out_free;
2710         if (resp_len > args.acl_len)
2711                 nfs4_write_cached_acl(inode, NULL, resp_len);
2712         else
2713                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2714         if (buf) {
2715                 ret = -ERANGE;
2716                 if (resp_len > buflen)
2717                         goto out_free;
2718                 if (localpage)
2719                         memcpy(buf, resp_buf, resp_len);
2720         }
2721         ret = resp_len;
2722 out_free:
2723         if (localpage)
2724                 __free_page(localpage);
2725         return ret;
2726 }
2727
2728 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2729 {
2730         struct nfs4_exception exception = { };
2731         ssize_t ret;
2732         do {
2733                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2734                 if (ret >= 0)
2735                         break;
2736                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2737         } while (exception.retry);
2738         return ret;
2739 }
2740
2741 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2742 {
2743         struct nfs_server *server = NFS_SERVER(inode);
2744         int ret;
2745
2746         if (!nfs4_server_supports_acls(server))
2747                 return -EOPNOTSUPP;
2748         ret = nfs_revalidate_inode(server, inode);
2749         if (ret < 0)
2750                 return ret;
2751         ret = nfs4_read_cached_acl(inode, buf, buflen);
2752         if (ret != -ENOENT)
2753                 return ret;
2754         return nfs4_get_acl_uncached(inode, buf, buflen);
2755 }
2756
2757 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2758 {
2759         struct nfs_server *server = NFS_SERVER(inode);
2760         struct page *pages[NFS4ACL_MAXPAGES];
2761         struct nfs_setaclargs arg = {
2762                 .fh             = NFS_FH(inode),
2763                 .acl_pages      = pages,
2764                 .acl_len        = buflen,
2765         };
2766         struct rpc_message msg = {
2767                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2768                 .rpc_argp       = &arg,
2769                 .rpc_resp       = NULL,
2770         };
2771         int ret;
2772
2773         if (!nfs4_server_supports_acls(server))
2774                 return -EOPNOTSUPP;
2775         nfs_inode_return_delegation(inode);
2776         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2777         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2778         nfs_zap_caches(inode);
2779         return ret;
2780 }
2781
2782 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2783 {
2784         struct nfs4_exception exception = { };
2785         int err;
2786         do {
2787                 err = nfs4_handle_exception(NFS_SERVER(inode),
2788                                 __nfs4_proc_set_acl(inode, buf, buflen),
2789                                 &exception);
2790         } while (exception.retry);
2791         return err;
2792 }
2793
2794 static int
2795 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2796 {
2797         struct nfs_client *clp = server->nfs_client;
2798
2799         if (!clp || task->tk_status >= 0)
2800                 return 0;
2801         switch(task->tk_status) {
2802                 case -NFS4ERR_STALE_CLIENTID:
2803                 case -NFS4ERR_STALE_STATEID:
2804                 case -NFS4ERR_EXPIRED:
2805                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2806                         nfs4_schedule_state_recovery(clp);
2807                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2808                                 rpc_wake_up_task(task);
2809                         task->tk_status = 0;
2810                         return -EAGAIN;
2811                 case -NFS4ERR_DELAY:
2812                         nfs_inc_server_stats((struct nfs_server *) server,
2813                                                 NFSIOS_DELAY);
2814                 case -NFS4ERR_GRACE:
2815                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2816                         task->tk_status = 0;
2817                         return -EAGAIN;
2818                 case -NFS4ERR_OLD_STATEID:
2819                         task->tk_status = 0;
2820                         return -EAGAIN;
2821         }
2822         task->tk_status = nfs4_map_errors(task->tk_status);
2823         return 0;
2824 }
2825
2826 static int nfs4_wait_bit_interruptible(void *word)
2827 {
2828         if (signal_pending(current))
2829                 return -ERESTARTSYS;
2830         schedule();
2831         return 0;
2832 }
2833
2834 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2835 {
2836         sigset_t oldset;
2837         int res;
2838
2839         might_sleep();
2840
2841         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2842
2843         rpc_clnt_sigmask(clnt, &oldset);
2844         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2845                         nfs4_wait_bit_interruptible,
2846                         TASK_INTERRUPTIBLE);
2847         rpc_clnt_sigunmask(clnt, &oldset);
2848
2849         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2850         return res;
2851 }
2852
2853 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2854 {
2855         sigset_t oldset;
2856         int res = 0;
2857
2858         might_sleep();
2859
2860         if (*timeout <= 0)
2861                 *timeout = NFS4_POLL_RETRY_MIN;
2862         if (*timeout > NFS4_POLL_RETRY_MAX)
2863                 *timeout = NFS4_POLL_RETRY_MAX;
2864         rpc_clnt_sigmask(clnt, &oldset);
2865         if (clnt->cl_intr) {
2866                 schedule_timeout_interruptible(*timeout);
2867                 if (signalled())
2868                         res = -ERESTARTSYS;
2869         } else
2870                 schedule_timeout_uninterruptible(*timeout);
2871         rpc_clnt_sigunmask(clnt, &oldset);
2872         *timeout <<= 1;
2873         return res;
2874 }
2875
2876 /* This is the error handling routine for processes that are allowed
2877  * to sleep.
2878  */
2879 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2880 {
2881         struct nfs_client *clp = server->nfs_client;
2882         int ret = errorcode;
2883
2884         exception->retry = 0;
2885         switch(errorcode) {
2886                 case 0:
2887                         return 0;
2888                 case -NFS4ERR_STALE_CLIENTID:
2889                 case -NFS4ERR_STALE_STATEID:
2890                 case -NFS4ERR_EXPIRED:
2891                         nfs4_schedule_state_recovery(clp);
2892                         ret = nfs4_wait_clnt_recover(server->client, clp);
2893                         if (ret == 0)
2894                                 exception->retry = 1;
2895                         break;
2896                 case -NFS4ERR_FILE_OPEN:
2897                 case -NFS4ERR_GRACE:
2898                 case -NFS4ERR_DELAY:
2899                         ret = nfs4_delay(server->client, &exception->timeout);
2900                         if (ret != 0)
2901                                 break;
2902                 case -NFS4ERR_OLD_STATEID:
2903                         exception->retry = 1;
2904         }
2905         /* We failed to handle the error */
2906         return nfs4_map_errors(ret);
2907 }
2908
2909 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2910 {
2911         nfs4_verifier sc_verifier;
2912         struct nfs4_setclientid setclientid = {
2913                 .sc_verifier = &sc_verifier,
2914                 .sc_prog = program,
2915         };
2916         struct rpc_message msg = {
2917                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2918                 .rpc_argp = &setclientid,
2919                 .rpc_resp = clp,
2920                 .rpc_cred = cred,
2921         };
2922         __be32 *p;
2923         int loop = 0;
2924         int status;
2925
2926         p = (__be32*)sc_verifier.data;
2927         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2928         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2929
2930         for(;;) {
2931                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2932                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2933                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr),
2934                                 cred->cr_ops->cr_name,
2935                                 clp->cl_id_uniquifier);
2936                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2937                                 sizeof(setclientid.sc_netid), "tcp");
2938                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2939                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2940                                 clp->cl_ipaddr, port >> 8, port & 255);
2941
2942                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2943                 if (status != -NFS4ERR_CLID_INUSE)
2944                         break;
2945                 if (signalled())
2946                         break;
2947                 if (loop++ & 1)
2948                         ssleep(clp->cl_lease_time + 1);
2949                 else
2950                         if (++clp->cl_id_uniquifier == 0)
2951                                 break;
2952         }
2953         return status;
2954 }
2955
2956 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2957 {
2958         struct nfs_fsinfo fsinfo;
2959         struct rpc_message msg = {
2960                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2961                 .rpc_argp = clp,
2962                 .rpc_resp = &fsinfo,
2963                 .rpc_cred = cred,
2964         };
2965         unsigned long now;
2966         int status;
2967
2968         now = jiffies;
2969         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2970         if (status == 0) {
2971                 spin_lock(&clp->cl_lock);
2972                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2973                 clp->cl_last_renewal = now;
2974                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2975                 spin_unlock(&clp->cl_lock);
2976         }
2977         return status;
2978 }
2979
2980 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2981 {
2982         long timeout;
2983         int err;
2984         do {
2985                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2986                 switch (err) {
2987                         case 0:
2988                                 return err;
2989                         case -NFS4ERR_RESOURCE:
2990                                 /* The IBM lawyers misread another document! */
2991                         case -NFS4ERR_DELAY:
2992                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2993                 }
2994         } while (err == 0);
2995         return err;
2996 }
2997
2998 struct nfs4_delegreturndata {
2999         struct nfs4_delegreturnargs args;
3000         struct nfs4_delegreturnres res;
3001         struct nfs_fh fh;
3002         nfs4_stateid stateid;
3003         struct rpc_cred *cred;
3004         unsigned long timestamp;
3005         struct nfs_fattr fattr;
3006         int rpc_status;
3007 };
3008
3009 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
3010 {
3011         struct nfs4_delegreturndata *data = calldata;
3012         struct rpc_message msg = {
3013                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3014                 .rpc_argp = &data->args,
3015                 .rpc_resp = &data->res,
3016                 .rpc_cred = data->cred,
3017         };
3018         nfs_fattr_init(data->res.fattr);
3019         rpc_call_setup(task, &msg, 0);
3020 }
3021
3022 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3023 {
3024         struct nfs4_delegreturndata *data = calldata;
3025         data->rpc_status = task->tk_status;
3026         if (data->rpc_status == 0)
3027                 renew_lease(data->res.server, data->timestamp);
3028 }
3029
3030 static void nfs4_delegreturn_release(void *calldata)
3031 {
3032         struct nfs4_delegreturndata *data = calldata;
3033
3034         put_rpccred(data->cred);
3035         kfree(calldata);
3036 }
3037
3038 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3039         .rpc_call_prepare = nfs4_delegreturn_prepare,
3040         .rpc_call_done = nfs4_delegreturn_done,
3041         .rpc_release = nfs4_delegreturn_release,
3042 };
3043
3044 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3045 {
3046         struct nfs4_delegreturndata *data;
3047         struct nfs_server *server = NFS_SERVER(inode);
3048         struct rpc_task *task;
3049         int status;
3050
3051         data = kmalloc(sizeof(*data), GFP_KERNEL);
3052         if (data == NULL)
3053                 return -ENOMEM;
3054         data->args.fhandle = &data->fh;
3055         data->args.stateid = &data->stateid;
3056         data->args.bitmask = server->attr_bitmask;
3057         nfs_copy_fh(&data->fh, NFS_FH(inode));
3058         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3059         data->res.fattr = &data->fattr;
3060         data->res.server = server;
3061         data->cred = get_rpccred(cred);
3062         data->timestamp = jiffies;
3063         data->rpc_status = 0;
3064
3065         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3066         if (IS_ERR(task))
3067                 return PTR_ERR(task);
3068         status = nfs4_wait_for_completion_rpc_task(task);
3069         if (status == 0) {
3070                 status = data->rpc_status;
3071                 if (status == 0)
3072                         nfs_post_op_update_inode(inode, &data->fattr);
3073         }
3074         rpc_put_task(task);
3075         return status;
3076 }
3077
3078 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3079 {
3080         struct nfs_server *server = NFS_SERVER(inode);
3081         struct nfs4_exception exception = { };
3082         int err;
3083         do {
3084                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3085                 switch (err) {
3086                         case -NFS4ERR_STALE_STATEID:
3087                         case -NFS4ERR_EXPIRED:
3088                         case 0:
3089                                 return 0;
3090                 }
3091                 err = nfs4_handle_exception(server, err, &exception);
3092         } while (exception.retry);
3093         return err;
3094 }
3095
3096 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3097 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3098
3099 /*
3100  * sleep, with exponential backoff, and retry the LOCK operation.
3101  */
3102 static unsigned long
3103 nfs4_set_lock_task_retry(unsigned long timeout)
3104 {
3105         schedule_timeout_interruptible(timeout);
3106         timeout <<= 1;
3107         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3108                 return NFS4_LOCK_MAXTIMEOUT;
3109         return timeout;
3110 }
3111
3112 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3113 {
3114         struct inode *inode = state->inode;
3115         struct nfs_server *server = NFS_SERVER(inode);
3116         struct nfs_client *clp = server->nfs_client;
3117         struct nfs_lockt_args arg = {
3118                 .fh = NFS_FH(inode),
3119                 .fl = request,
3120         };
3121         struct nfs_lockt_res res = {
3122                 .denied = request,
3123         };
3124         struct rpc_message msg = {
3125                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3126                 .rpc_argp       = &arg,
3127                 .rpc_resp       = &res,
3128                 .rpc_cred       = state->owner->so_cred,
3129         };
3130         struct nfs4_lock_state *lsp;
3131         int status;
3132
3133         down_read(&clp->cl_sem);
3134         arg.lock_owner.clientid = clp->cl_clientid;
3135         status = nfs4_set_lock_state(state, request);
3136         if (status != 0)
3137                 goto out;
3138         lsp = request->fl_u.nfs4_fl.owner;
3139         arg.lock_owner.id = lsp->ls_id.id;
3140         status = rpc_call_sync(server->client, &msg, 0);
3141         switch (status) {
3142                 case 0:
3143                         request->fl_type = F_UNLCK;
3144                         break;
3145                 case -NFS4ERR_DENIED:
3146                         status = 0;
3147         }
3148         request->fl_ops->fl_release_private(request);
3149 out:
3150         up_read(&clp->cl_sem);
3151         return status;
3152 }
3153
3154 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3155 {
3156         struct nfs4_exception exception = { };
3157         int err;
3158
3159         do {
3160                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3161                                 _nfs4_proc_getlk(state, cmd, request),
3162                                 &exception);
3163         } while (exception.retry);
3164         return err;
3165 }
3166
3167 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3168 {
3169         int res = 0;
3170         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3171                 case FL_POSIX:
3172                         res = posix_lock_file_wait(file, fl);
3173                         break;
3174                 case FL_FLOCK:
3175                         res = flock_lock_file_wait(file, fl);
3176                         break;
3177                 default:
3178                         BUG();
3179         }
3180         return res;
3181 }
3182
3183 struct nfs4_unlockdata {
3184         struct nfs_locku_args arg;
3185         struct nfs_locku_res res;
3186         struct nfs4_lock_state *lsp;
3187         struct nfs_open_context *ctx;
3188         struct file_lock fl;
3189         const struct nfs_server *server;
3190         unsigned long timestamp;
3191 };
3192
3193 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3194                 struct nfs_open_context *ctx,
3195                 struct nfs4_lock_state *lsp,
3196                 struct nfs_seqid *seqid)
3197 {
3198         struct nfs4_unlockdata *p;
3199         struct inode *inode = lsp->ls_state->inode;
3200
3201         p = kmalloc(sizeof(*p), GFP_KERNEL);
3202         if (p == NULL)
3203                 return NULL;
3204         p->arg.fh = NFS_FH(inode);
3205         p->arg.fl = &p->fl;
3206         p->arg.seqid = seqid;
3207         p->arg.stateid = &lsp->ls_stateid;
3208         p->lsp = lsp;
3209         atomic_inc(&lsp->ls_count);
3210         /* Ensure we don't close file until we're done freeing locks! */
3211         p->ctx = get_nfs_open_context(ctx);
3212         memcpy(&p->fl, fl, sizeof(p->fl));
3213         p->server = NFS_SERVER(inode);
3214         return p;
3215 }
3216
3217 static void nfs4_locku_release_calldata(void *data)
3218 {
3219         struct nfs4_unlockdata *calldata = data;
3220         nfs_free_seqid(calldata->arg.seqid);
3221         nfs4_put_lock_state(calldata->lsp);
3222         put_nfs_open_context(calldata->ctx);
3223         kfree(calldata);
3224 }
3225
3226 static void nfs4_locku_done(struct rpc_task *task, void *data)
3227 {
3228         struct nfs4_unlockdata *calldata = data;
3229
3230         if (RPC_ASSASSINATED(task))
3231                 return;
3232         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3233         switch (task->tk_status) {
3234                 case 0:
3235                         memcpy(calldata->lsp->ls_stateid.data,
3236                                         calldata->res.stateid.data,
3237                                         sizeof(calldata->lsp->ls_stateid.data));
3238                         renew_lease(calldata->server, calldata->timestamp);
3239                         break;
3240                 case -NFS4ERR_STALE_STATEID:
3241                 case -NFS4ERR_EXPIRED:
3242                         break;
3243                 default:
3244                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3245                                 rpc_restart_call(task);
3246         }
3247 }
3248
3249 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3250 {
3251         struct nfs4_unlockdata *calldata = data;
3252         struct rpc_message msg = {
3253                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3254                 .rpc_argp       = &calldata->arg,
3255                 .rpc_resp       = &calldata->res,
3256                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3257         };
3258
3259         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3260                 return;
3261         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3262                 /* Note: exit _without_ running nfs4_locku_done */
3263                 task->tk_action = NULL;
3264                 return;
3265         }
3266         calldata->timestamp = jiffies;
3267         rpc_call_setup(task, &msg, 0);
3268 }
3269
3270 static const struct rpc_call_ops nfs4_locku_ops = {
3271         .rpc_call_prepare = nfs4_locku_prepare,
3272         .rpc_call_done = nfs4_locku_done,
3273         .rpc_release = nfs4_locku_release_calldata,
3274 };
3275
3276 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3277                 struct nfs_open_context *ctx,
3278                 struct nfs4_lock_state *lsp,
3279                 struct nfs_seqid *seqid)
3280 {
3281         struct nfs4_unlockdata *data;
3282
3283         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3284         if (data == NULL) {
3285                 nfs_free_seqid(seqid);
3286                 return ERR_PTR(-ENOMEM);
3287         }
3288
3289         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3290 }
3291
3292 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3293 {
3294         struct nfs_seqid *seqid;
3295         struct nfs4_lock_state *lsp;
3296         struct rpc_task *task;
3297         int status = 0;
3298
3299         status = nfs4_set_lock_state(state, request);
3300         /* Unlock _before_ we do the RPC call */
3301         request->fl_flags |= FL_EXISTS;
3302         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3303                 goto out;
3304         if (status != 0)
3305                 goto out;
3306         /* Is this a delegated lock? */
3307         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3308                 goto out;
3309         lsp = request->fl_u.nfs4_fl.owner;
3310         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3311         status = -ENOMEM;
3312         if (seqid == NULL)
3313                 goto out;
3314         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3315         status = PTR_ERR(task);
3316         if (IS_ERR(task))
3317                 goto out;
3318         status = nfs4_wait_for_completion_rpc_task(task);
3319         rpc_put_task(task);
3320 out:
3321         return status;
3322 }
3323
3324 struct nfs4_lockdata {
3325         struct nfs_lock_args arg;
3326         struct nfs_lock_res res;
3327         struct nfs4_lock_state *lsp;
3328         struct nfs_open_context *ctx;
3329         struct file_lock fl;
3330         unsigned long timestamp;
3331         int rpc_status;
3332         int cancelled;
3333 };
3334
3335 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3336                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3337 {
3338         struct nfs4_lockdata *p;
3339         struct inode *inode = lsp->ls_state->inode;
3340         struct nfs_server *server = NFS_SERVER(inode);
3341
3342         p = kzalloc(sizeof(*p), GFP_KERNEL);
3343         if (p == NULL)
3344                 return NULL;
3345
3346         p->arg.fh = NFS_FH(inode);
3347         p->arg.fl = &p->fl;
3348         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3349         if (p->arg.lock_seqid == NULL)
3350                 goto out_free;
3351         p->arg.lock_stateid = &lsp->ls_stateid;
3352         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3353         p->arg.lock_owner.id = lsp->ls_id.id;
3354         p->lsp = lsp;
3355         atomic_inc(&lsp->ls_count);
3356         p->ctx = get_nfs_open_context(ctx);
3357         memcpy(&p->fl, fl, sizeof(p->fl));
3358         return p;
3359 out_free:
3360         kfree(p);
3361         return NULL;
3362 }
3363
3364 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3365 {
3366         struct nfs4_lockdata *data = calldata;
3367         struct nfs4_state *state = data->lsp->ls_state;
3368         struct nfs4_state_owner *sp = state->owner;
3369         struct rpc_message msg = {
3370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3371                 .rpc_argp = &data->arg,
3372                 .rpc_resp = &data->res,
3373                 .rpc_cred = sp->so_cred,
3374         };
3375
3376         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3377                 return;
3378         dprintk("%s: begin!\n", __FUNCTION__);
3379         /* Do we need to do an open_to_lock_owner? */
3380         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3381                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3382                 if (data->arg.open_seqid == NULL) {
3383                         data->rpc_status = -ENOMEM;
3384                         task->tk_action = NULL;
3385                         goto out;
3386                 }
3387                 data->arg.open_stateid = &state->stateid;
3388                 data->arg.new_lock_owner = 1;
3389         }
3390         data->timestamp = jiffies;
3391         rpc_call_setup(task, &msg, 0);
3392 out:
3393         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3394 }
3395
3396 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3397 {
3398         struct nfs4_lockdata *data = calldata;
3399
3400         dprintk("%s: begin!\n", __FUNCTION__);
3401
3402         data->rpc_status = task->tk_status;
3403         if (RPC_ASSASSINATED(task))
3404                 goto out;
3405         if (data->arg.new_lock_owner != 0) {
3406                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3407                 if (data->rpc_status == 0)
3408                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3409                 else
3410                         goto out;
3411         }
3412         if (data->rpc_status == 0) {
3413                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3414                                         sizeof(data->lsp->ls_stateid.data));
3415                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3416                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3417         }
3418         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3419 out:
3420         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3421 }
3422
3423 static void nfs4_lock_release(void *calldata)
3424 {
3425         struct nfs4_lockdata *data = calldata;
3426
3427         dprintk("%s: begin!\n", __FUNCTION__);
3428         if (data->arg.open_seqid != NULL)
3429                 nfs_free_seqid(data->arg.open_seqid);
3430         if (data->cancelled != 0) {
3431                 struct rpc_task *task;
3432                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3433                                 data->arg.lock_seqid);
3434                 if (!IS_ERR(task))
3435                         rpc_put_task(task);
3436                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3437         } else
3438                 nfs_free_seqid(data->arg.lock_seqid);
3439         nfs4_put_lock_state(data->lsp);
3440         put_nfs_open_context(data->ctx);
3441         kfree(data);
3442         dprintk("%s: done!\n", __FUNCTION__);
3443 }
3444
3445 static const struct rpc_call_ops nfs4_lock_ops = {
3446         .rpc_call_prepare = nfs4_lock_prepare,
3447         .rpc_call_done = nfs4_lock_done,
3448         .rpc_release = nfs4_lock_release,
3449 };
3450
3451 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3452 {
3453         struct nfs4_lockdata *data;
3454         struct rpc_task *task;
3455         int ret;
3456
3457         dprintk("%s: begin!\n", __FUNCTION__);
3458         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3459                         fl->fl_u.nfs4_fl.owner);
3460         if (data == NULL)
3461                 return -ENOMEM;
3462         if (IS_SETLKW(cmd))
3463                 data->arg.block = 1;
3464         if (reclaim != 0)
3465                 data->arg.reclaim = 1;
3466         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3467                         &nfs4_lock_ops, data);
3468         if (IS_ERR(task))
3469                 return PTR_ERR(task);
3470         ret = nfs4_wait_for_completion_rpc_task(task);
3471         if (ret == 0) {
3472                 ret = data->rpc_status;
3473                 if (ret == -NFS4ERR_DENIED)
3474                         ret = -EAGAIN;
3475         } else
3476                 data->cancelled = 1;
3477         rpc_put_task(task);
3478         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3479         return ret;
3480 }
3481
3482 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3483 {
3484         struct nfs_server *server = NFS_SERVER(state->inode);
3485         struct nfs4_exception exception = { };
3486         int err;
3487
3488         do {
3489                 /* Cache the lock if possible... */
3490                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3491                         return 0;
3492                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3493                 if (err != -NFS4ERR_DELAY)
3494                         break;
3495                 nfs4_handle_exception(server, err, &exception);
3496         } while (exception.retry);
3497         return err;
3498 }
3499
3500 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3501 {
3502         struct nfs_server *server = NFS_SERVER(state->inode);
3503         struct nfs4_exception exception = { };
3504         int err;
3505
3506         err = nfs4_set_lock_state(state, request);
3507         if (err != 0)
3508                 return err;
3509         do {
3510                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3511                         return 0;
3512                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3513                 if (err != -NFS4ERR_DELAY)
3514                         break;
3515                 nfs4_handle_exception(server, err, &exception);
3516         } while (exception.retry);
3517         return err;
3518 }
3519
3520 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3521 {
3522         struct nfs_client *clp = state->owner->so_client;
3523         unsigned char fl_flags = request->fl_flags;
3524         int status;
3525
3526         /* Is this a delegated open? */
3527         status = nfs4_set_lock_state(state, request);
3528         if (status != 0)
3529                 goto out;
3530         request->fl_flags |= FL_ACCESS;
3531         status = do_vfs_lock(request->fl_file, request);
3532         if (status < 0)
3533                 goto out;
3534         down_read(&clp->cl_sem);
3535         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3536                 struct nfs_inode *nfsi = NFS_I(state->inode);
3537                 /* Yes: cache locks! */
3538                 down_read(&nfsi->rwsem);
3539                 /* ...but avoid races with delegation recall... */
3540                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3541                         request->fl_flags = fl_flags & ~FL_SLEEP;
3542                         status = do_vfs_lock(request->fl_file, request);
3543                         up_read(&nfsi->rwsem);
3544                         goto out_unlock;
3545                 }
3546                 up_read(&nfsi->rwsem);
3547         }
3548         status = _nfs4_do_setlk(state, cmd, request, 0);
3549         if (status != 0)
3550                 goto out_unlock;
3551         /* Note: we always want to sleep here! */
3552         request->fl_flags = fl_flags | FL_SLEEP;
3553         if (do_vfs_lock(request->fl_file, request) < 0)
3554                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3555 out_unlock:
3556         up_read(&clp->cl_sem);
3557 out:
3558         request->fl_flags = fl_flags;
3559         return status;
3560 }
3561
3562 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3563 {
3564         struct nfs4_exception exception = { };
3565         int err;
3566
3567         do {
3568                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3569                                 _nfs4_proc_setlk(state, cmd, request),
3570                                 &exception);
3571         } while (exception.retry);
3572         return err;
3573 }
3574
3575 static int
3576 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3577 {
3578         struct nfs_open_context *ctx;
3579         struct nfs4_state *state;
3580         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3581         int status;
3582
3583         /* verify open state */
3584         ctx = (struct nfs_open_context *)filp->private_data;
3585         state = ctx->state;
3586
3587         if (request->fl_start < 0 || request->fl_end < 0)
3588                 return -EINVAL;
3589
3590         if (IS_GETLK(cmd))
3591                 return nfs4_proc_getlk(state, F_GETLK, request);
3592
3593         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3594                 return -EINVAL;
3595
3596         if (request->fl_type == F_UNLCK)
3597                 return nfs4_proc_unlck(state, cmd, request);
3598
3599         do {
3600                 status = nfs4_proc_setlk(state, cmd, request);
3601                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3602                         break;
3603                 timeout = nfs4_set_lock_task_retry(timeout);
3604                 status = -ERESTARTSYS;
3605                 if (signalled())
3606                         break;
3607         } while(status < 0);
3608         return status;
3609 }
3610
3611 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3612 {
3613         struct nfs_server *server = NFS_SERVER(state->inode);
3614         struct nfs4_exception exception = { };
3615         int err;
3616
3617         err = nfs4_set_lock_state(state, fl);
3618         if (err != 0)
3619                 goto out;
3620         do {
3621                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3622                 if (err != -NFS4ERR_DELAY)
3623                         break;
3624                 err = nfs4_handle_exception(server, err, &exception);
3625         } while (exception.retry);
3626 out:
3627         return err;
3628 }
3629
3630 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3631
3632 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3633                 size_t buflen, int flags)
3634 {
3635         struct inode *inode = dentry->d_inode;
3636
3637         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3638                 return -EOPNOTSUPP;
3639
3640         if (!S_ISREG(inode->i_mode) &&
3641             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3642                 return -EPERM;
3643
3644         return nfs4_proc_set_acl(inode, buf, buflen);
3645 }
3646
3647 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3648  * and that's what we'll do for e.g. user attributes that haven't been set.
3649  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3650  * attributes in kernel-managed attribute namespaces. */
3651 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3652                 size_t buflen)
3653 {
3654         struct inode *inode = dentry->d_inode;
3655
3656         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3657                 return -EOPNOTSUPP;
3658
3659         return nfs4_proc_get_acl(inode, buf, buflen);
3660 }
3661
3662 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3663 {
3664         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3665
3666         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3667                 return 0;
3668         if (buf && buflen < len)
3669                 return -ERANGE;
3670         if (buf)
3671                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3672         return len;
3673 }
3674
3675 int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name,
3676                 struct nfs4_fs_locations *fs_locations, struct page *page)
3677 {
3678         struct nfs_server *server = NFS_SERVER(dir);
3679         u32 bitmask[2] = {
3680                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3681                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3682         };
3683         struct nfs4_fs_locations_arg args = {
3684                 .dir_fh = NFS_FH(dir),
3685                 .name = name,
3686                 .page = page,
3687                 .bitmask = bitmask,
3688         };
3689         struct rpc_message msg = {
3690                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3691                 .rpc_argp = &args,
3692                 .rpc_resp = fs_locations,
3693         };
3694         int status;
3695
3696         dprintk("%s: start\n", __FUNCTION__);
3697         nfs_fattr_init(&fs_locations->fattr);
3698         fs_locations->server = server;
3699         fs_locations->nlocations = 0;
3700         status = rpc_call_sync(server->client, &msg, 0);
3701         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3702         return status;
3703 }
3704
3705 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3706         .recover_open   = nfs4_open_reclaim,
3707         .recover_lock   = nfs4_lock_reclaim,
3708 };
3709
3710 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3711         .recover_open   = nfs4_open_expired,
3712         .recover_lock   = nfs4_lock_expired,
3713 };
3714
3715 static const struct inode_operations nfs4_file_inode_operations = {
3716         .permission     = nfs_permission,
3717         .getattr        = nfs_getattr,
3718         .setattr        = nfs_setattr,
3719         .getxattr       = nfs4_getxattr,
3720         .setxattr       = nfs4_setxattr,
3721         .listxattr      = nfs4_listxattr,
3722 };
3723
3724 const struct nfs_rpc_ops nfs_v4_clientops = {
3725         .version        = 4,                    /* protocol version */
3726         .dentry_ops     = &nfs4_dentry_operations,
3727         .dir_inode_ops  = &nfs4_dir_inode_operations,
3728         .file_inode_ops = &nfs4_file_inode_operations,
3729         .getroot        = nfs4_proc_get_root,
3730         .getattr        = nfs4_proc_getattr,
3731         .setattr        = nfs4_proc_setattr,
3732         .lookupfh       = nfs4_proc_lookupfh,
3733         .lookup         = nfs4_proc_lookup,
3734         .access         = nfs4_proc_access,
3735         .readlink       = nfs4_proc_readlink,
3736         .create         = nfs4_proc_create,
3737         .remove         = nfs4_proc_remove,
3738         .unlink_setup   = nfs4_proc_unlink_setup,
3739         .unlink_done    = nfs4_proc_unlink_done,
3740         .rename         = nfs4_proc_rename,
3741         .link           = nfs4_proc_link,
3742         .symlink        = nfs4_proc_symlink,
3743         .mkdir          = nfs4_proc_mkdir,
3744         .rmdir          = nfs4_proc_remove,
3745         .readdir        = nfs4_proc_readdir,
3746         .mknod          = nfs4_proc_mknod,
3747         .statfs         = nfs4_proc_statfs,
3748         .fsinfo         = nfs4_proc_fsinfo,
3749         .pathconf       = nfs4_proc_pathconf,
3750         .set_capabilities = nfs4_server_capabilities,
3751         .decode_dirent  = nfs4_decode_dirent,
3752         .read_setup     = nfs4_proc_read_setup,
3753         .read_done      = nfs4_read_done,
3754         .write_setup    = nfs4_proc_write_setup,
3755         .write_done     = nfs4_write_done,
3756         .commit_setup   = nfs4_proc_commit_setup,
3757         .commit_done    = nfs4_commit_done,
3758         .file_open      = nfs_open,
3759         .file_release   = nfs_release,
3760         .lock           = nfs4_proc_lock,
3761         .clear_acl_cache = nfs4_zap_acl_attr,
3762 };
3763
3764 /*
3765  * Local variables:
3766  *  c-basic-offset: 8
3767  * End:
3768  */